Friedrich QUIETMASTER 2008 User Manual

Service Manual

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Room Air Conditioners

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RAC-ServMan (04-09)

Table Of Contents

Important Safety Information ........................................................................................................................................ 2-4

Introduction ...................................................................................................................................................................... 5

Unit Identiﬁcation ............................................................................................................................................................. 6

Chassis Speciﬁcations for 2009, 2008 Models ............................................................................................................... 7

Installation Information/Sleeve Dimensions .................................................................................................................... 8

Performance Data ........................................................................................................................................................... 9

Electrical Data ............................................................................................................................................................... 10

Before Operating the Unit .............................................................................................................................................. 11

How to Operate the QM Programmable ........................................................................................................................ 12

How to Use the QM Programmable Remote Control ..................................................................................................... 13

How to Operate the XQ .................................................................................................................................................. 14

How to Use the XQ Remote Control .............................................................................................................................. 15

How to Operate the QM and Twintemp .................................................................................................................... 16-17

Testing the Electronic Control and Error Code Listings .............................................................................................17-18

Testing the Rotary Control Switches ..........................................................................................................................19-20

Functional Component Deﬁnition ................................................................................................................................... 20

Components Testing ...................................................................................................................................................21-24

Defrost Thermostat Operation ........................................................................................................................................ 24

Electronic Control Sequence of Operation ..................................................................................................................... 25

Refrigeration Sequence of Operation ............................................................................................................................. 26

Sealed Refrigeration System Repairs ....................................................................................................................... 27-30

Hermetics Components Check ...................................................................................................................................... 31

Reversing Valve Description/Operation ......................................................................................................................... 32

Testing the Coil .............................................................................................................................................................. 33

Checking the Reversing Valve .................................................................................................................................. 33-34

Compressor Checks .................................................................................................................................................. 35-36

Compressor Replacement ......................................................................................................................................... 37-38

Routine Maintenance ................................................................................................................................................. 39-40

Troubleshooting ......................................................................................................................................................... 41-48

Wiring Diagrams ........................................................................................................................................................ 49-58

Instructions for using Cooling Load Estimate Form ........................................................................................................ 58

Cooling Load Estimate Form .......................................................................................................................................... 60

Heat Load Form ......................................................................................................................................................... 61-62

Warranty .......................................................................................................................................................................... 63

IMPORTANT SAFETY INFORMATION

The information contained in this manual is intended for use by a qualiﬁed service technician who is familiar

with the safety procedures required for installation and repair, and who is equipped with the proper tools and

test instruments required to service this product.

Installation or repairs made by unqualiﬁed persons can result in subjecting the unqualiﬁed person making

such repairs as well as the persons being served by the equipment to hazards resulting in injury or electrical

shock which can be serious or even fatal.

Safety warnings have been placed throughout this manual to alert you to potential hazards that may be

encountered. If you install or perform service on equipment, it is your responsibility to read and obey these

warnings to guard against any bodily injury or property damage which may result to you or others.

Your safety and the safety of others are very important.

We have provided many important safety messages in this manual and on your appliance. Always read

and obey all safety messages.

This is a Safety Alert symbol.

This symbol alerts you to potential hazards that can kill or hurt you and others.

All safety messages will follow the safety alert symbol with the word “WARNING”

or “CAUTION”. These words mean:

You can be killed or seriously injured if you do not follow instructions.

WARNING

You can receive minor or moderate injury if you do not follow instructions.

CAUTION

All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury,

and tell you what will happen if the instructions are not followed.

A message to alert you of potential property damage will have the

word “NOTICE”. Potential property damage can occur if instructions

are not followed.

NOTICE

PERSONAL INJURY OR DEATH HAZARDS

ELECTRICAL HAZARDS:

•

Unplug and/or disconnect all electrical power to the unit before performing inspections,

maintenance, or service.

•

Make sure to follow proper lockout/tag out procedures.

Always work in the company of a qualiﬁed assistant if possible.

Capacitors, even when disconnected from the electrical power source, retain an electrical charge

potential capable of causing electric shock or electrocution.

•

Handle, discharge, and test capacitors according to safe, established, standards, and approved

procedures.

Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary

to test or troubleshoot equipment with the power on to the unit.

•

Do not spray or pour water on the return air grille, discharge air grille, evaporator coil, control panel,

and sleeve on the room side of the air conditioning unit while cleaning.

Electrical component malfunction caused by water could result in electric shock or other electrically

unsafe conditions when the power is restored and the unit is turned on, even after the exterior is dry.

•

Never operate the A/C unit with wet hands.

Use air conditioner on a single dedicated circuit within the speciﬁed amperage rating.

Use on a properly grounded outlet only.

Do not remove ground prong of plug.

Do not cut or modify the power supply cord.

Do not use extension cords with the unit.

Follow all safety precautions and use proper and adequate protective safety aids such as: gloves,

goggles, clothing, adequately insulated tools, and testing equipment etc.

•

Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.

REFRIGERATION SYSTEM HAZARDS:

•

Use approved standard refrigerant recovering procedures and equipment to relieve pressure before

opening system for repair.

Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor

to moderate injury.

Be extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s ﬂame or hot

surfaces can cause serious burns.

•

Make sure to protect personal and surrounding property with ﬁre proof materials.

Have a ﬁre extinguisher at hand while using a torch.

Provide adequate ventilation to vent off toxic fumes, and work with a qualiﬁed assistant whenever

possible.

•

Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for

leaks, ﬂushing etc.

Make sure to follow all safety precautions and to use proper protective safety aids such as: gloves,

safety glasses, clothing etc.

Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.

MECHANICAL HAZARDS:

•

Extreme care, proper judgment and all safety procedures must be followed when testing,

troubleshooting, handling, or working around unit with moving and/or rotating parts.

•

Be careful when, handling and working around exposed edges and corners of sleeve, chassis, and

other unit components especially the sharp ﬁns of the indoor and outdoor coils.

•

Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.

Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.

PROPERTY DAMAGE HAZARDS

FIRE DAMAGE HAZARDS:

•

Read the Installation/Operation Manual for this air conditioning unit prior to operating.

Use air conditioner on a single dedicated circuit within the speciﬁed amperage rating.

Connect to a properly grounded outlet only.

Do not remove ground prong of plug.

Do not cut or modify the power supply cord.

Do not use extension cords with the unit.

Failure to follow these instructions can result in ﬁre and minor to serious property damage.

WATER DAMAGE HAZARDS:

•

Improper installation maintenance, or servicing of the air conditioner unit, or not following the above

Safety Warnings can result in water damage to personal items or property.

•

Insure that the unit has a sufﬁcient pitch to the outside to allow water to drain from the unit.

Do not drill holes in the bottom of the drain pan or the underside of the unit.

Failure to follow these instructions can result in result in damage to the unit and/or minor to serious

property damage.

INTrOdUCTION

This service manual is designed to be used in conjunction with the installation manuals provided with each air conditioning

system component.

This service manual was written to assist the professional RAC service technician to quickly and accurately diagnose

and repair malfunctions.

This manual will deal with subjects in a general nature. (i.e. all text will not pertain to all models).

TYPICAL UNIT COMPONENTS

Fresh Air

Compressor

Liquid Filter Driers

Capillary Tube

Reversing Valve

(some models)

Condenser Coil

Discharge Air

Front Cover

System Switches

Outdoor Grille

Sleeve

Evaporator Coil

Return Air Grille/Filter

Blower Wheel

Blower Motor

Condenser Fan Blade

Basepan

IMPORTANT: It will be necessary for you to accurately identify the unit you are servicing, so you can be certain of a

proper diagnosis and repair (See Unit Identiﬁcation on page 6).

UNIT IdENTIfICATION

Model Number Code

S S 08 L 1 0 E

8th Digit – Engineering

Major change

1st Digit – Function

S = Straight Cool, Value Series

Y = Heat Pump

7th Digit – Options

E = Electric Heat

0 = Straight Cool &

K = Straight Cool

Heat Pump Models

R = Straight Cool

1 = 1 KW Heat Strip, Nominal

3 = 3 KW Heat Strip, Nominal

4 = 4 KW Heat Strip, Nominal

5 = 5 KW Heat Strip, Nominal

X = Straight Cool

2nd Digit

Q = Q-Star

S = Small Chassis

M = Medium Chassis

L = Large Chassis

H = HazardGard

6th Digit – Voltage

1 = 115 Volts

3 = 230-208 Volts

5th Digit

Alphabetical Modiﬁer

3rd and 4th Digit - Approximate

BTU/HR in 1000s (Cooling)

Heating BTU/Hr capacity listed in the

Speciﬁcation/Performance Data Section

RAC Serial Number Identiﬁcation Guide

Serial Number

Decade Manufactured

00001

L=0

A=1

B=2

C=3

D=4

E=5

F=6

G=7

H=8

J=9

Production Run Number

Year Manufactured

Product Line

R = RAC

A=1

B=2

C=3

D=4

E=5

F=6

G=7

H=8

J=9

K=0

Month Manufactured

A=Jan D=Apr G=Jul K=Oct

B=Feb E=May H=Aug L=Nov

C=Mar F=Jun J=Sept M=Dec

ChASSIS SPECIfICATIONS fOr 2009, 2008 MOdELS

ENERGY STAR^®Models

Energy

Efficiency

Ratio Performance Removal Air Circulation

Coefficient

Electrical Characteristics (60 Hertz)

Cooling

Capacity

BTU/h

Heating

Capacity

Rated

Moisture Room Side

Weight

Lbs.

Sleeve* Ship/Net

Volts

Cooling

Amps

Cooling Heating Heating

Model

Rated

Watts

Amps

Watts

EER

COP

Pints/Hr.

CFM

ULTRA PREMIUM LINE

QUIETMASTER Programmable

SS08L10

SS10L10

SS12L10

SS14L10

SS12L30

SS16L30

SM18L30A

SM21L30

SM24L30

8400

10400

11800

14000

12100/11900

16200/15900

17500/17300

20600/20200

23500/23000

—

115

6.6

7.5

9.0

737

867

1000

1305

1052/1017

1653/1656

1620/1570

2081/2020

2479/2421

—

11.4

12.0

11.8

1.6

2.5

3.5

2.9

4.7

4.5

6.0

7.0

265

260

350

377

320

360

375

425

400

114/108

121/115

120/114

134/128

120/114

125/119

169/163

160/154

115

12.0

10.7

230/208

4.8/5.0

7.4/8.0

7.2/7.7

9.4/10.1

11.2/12.1

11.5/11.7

9.8/9.6

10.8/10.8

9.9/10.0

9.5/9.5

XSTAR

XQ05L10A

XQ06L10A

XQ08L10A

XQ10L10A

XQ12L10A

5500

6300

8000

10000

11700

—

115

5.0

4.9

6.8

9.0

500

548

741

1000

1198

—

11.0

11.5

10.8

10.0

9.8

1.2

1.4

1.9

3.2

200

175

180

200

76/70

83/77

89/83

11.0

PREMIUM LINE

QUIETMASTER

KS12L10

11600

14500

—

115

230/208

9.0

12.0

8.1/8.8

11.2/12.1

13.0/14.2

18.0/19.6

1055

1343

1780/1760

2479/2421

2947/2916

4235/4200

—

11.0

10.8

10.0/10.0

9.5/9.5

8.5/8.5

2.5

3.5

4.4

7.0

8.8

11.0

356

377

400

600

725

120/114

134/128

167/161

160/154

207/201

226/220

KS15L10

KM18L30

KM24L30

SL28L30

SL36L30A

17800/17600

23500/23000

28000/27700

36000/35700

TWINTEMP Heat Pump

YS09L10**

9200

7400

115

7.4

767

1149/1131

1895/1895

6.9

733

12.0

3.0

1.7

3.5

4.7

7.0

300

325

400

600

117/113

121/117

170/166

202/198

YS13L33

YM18L34

YL24L35

12700/12500 11000/10500 230/208

18000/18000 16800/16400 230/208

24000/24000 22000/21600 230/208

5.1/5.6

8.5/9.5

10.9/12.0

5.3/5.8 1185/1167 11.0/11.0

8.5/9.0 1867/1822 9.5/9.5

2.5/2.6

2.8/2.9

2.7/2.8

2400/2400 11.0/12.0 2444/2400 10.0/10.0

TWINTEMP Electric Heat

EQ08L11A

ES12L33

ES16L33

EM18L34

EM24L34

EL36L35A

7700

12100/11900

16200/15900 10700/8900 230/208

17800/17600 13000/10600 230/208

23500/23000 13000/10600 230/208

36000/35700 17300/14300 230/208

4000

115

6.5

4.8/5.0

7.4/8.0

8.1/8.8

11.2/12.1

18.0/19.6

733

1052/1017 16.0/14.7 3500/2900 11.5/11.7

1653/1656 16.0/14.7 3500/2900 9.8/9.6

1780/1760 19.5/17.0 4200/3500 10.0/10.0

11.2

1290

10.5

1.9

2.9

4.7

4.4

7.0

175

320

360

400

725

80/76

10700/8900 230/208

115/111

120/116

164/160

160/154

224/220

2479/2421 19.5/17.0 4200/3500

4235/4200 24.0/22.4 5500/4650

9.5/9.5

8.5/8.5

11.0

* Sleeve dimensions listed on opposite page.

** Operates on 115 volt and is not equipped with supplemental heat. Will not provide heat at temperatures below 40°F.

Friedrich room air conditioners are designed to operate in outdoor temperatures from 50° F to 115°F.

TwinTemp Heat Pump heating information (shown in red) indicates heat pump heating performance. TwinTemp Electric Heat heating information (shown in red) indicates electric heat strip performance.

For TwinTemp Heat Pump electric heating performance refer to corresponding TwinTemp Electric Heat model.

Due to continuing research in new energy-saving technology, specifications are subject to change without notice.

As an ENERGY STAR^®partner, Friedrich Air Conditioning Co. has determined that the selected ENERGY STAR^®

(

) models meet the ENERGY STAR^®guidelines for energy efficiency.

The consumer- through the AHAM Room Air Conditioner Certification Program- can be certain that the AHAM Certification Seal accurately

states the unit’s cooling and heating capacity rating, the amperes and the energy efficiency ratio.

INSTALLATION INfOrMATION / SLEEvE dIMENSIONS

Thru-the-wall Installation

Finished Hole

Depth

with Front

Shell Depth to

Louvers

Window Width

Minimum

Extension

Into Room*

Minimum

Extension

Outside*

Sleeve

Height

14"

15 ¹⁵∕16"

17 ¹⁵∕16"

20 ³∕16"

Width

19 ¾"

25 ¹⁵∕16"

28"

Minimum** Maximum Height

Width

Max. Depth

21 ³∕8

27 ³∕8

33 ⁵∕8

8 ½"

8 ¾"

16 ½"

5 ½"

3 ¹∕16"

3 ³∕16"

10 ¾"

16 ¹⁵∕16"

18 ¹⁵∕16"

22"

27 ³∕8

42"

14 ¼"

16 ³∕16"

18 ³∕16"

20"

8 ½”

26 ³∕16"

28 ¼"

7 ³∕8

15 ¹∕8

”

29 ⁷∕8

20 ³∕8

* Minimum extensions when mounted in a window.

** Minimum widths achieved using one side curtain assembly as opposed to both in a standard installation.

† Sleeve P1 does not have thru-the-wall hole dimensions, as these units are fixed chassis and should not be installed thru-the-wall.

NOTE: S,M and L sleeves may be installed in window with no side kits if properly installed.

(A)

Circuit rating / Breaker

(C)

Circuit Rating

Breaker or

T-D Fuse

Plug Face Power Cord

(NEMA#) Length (ft.) Appearance

Wall Outlet

Model

All XQ MODELS.

KS12L10 and KS15L10. SS08L10, SS10L10,

SS12L10 and SS14L10. EQ08L11A.

YS09L10.

125V - 15A

250V - 15A

5 - 15P

6 - 15P

Front

SIDE VIEW

(B)

KM18L30.

SS12L30, SS16L30, SM18L30A and

SM21L30.

Window Mounting Kits

KM24L30. SM24L30 and SL28L30.

ES12L33 and ES16L33. YS13L33.

250V - 20A

250V - 30A

6 - 20P

6 - 30P

TwinTemp Model

Kit No.

WIKQ

WIKS

WIKM

WIKL

SL36L30A. EM18L34, EM24L34 and

EL36L35A. YM18L34 and YL24L35.

EQ08L11A

ES12L33, ES16L33, YS09L10 and YS13L33.

EM18L34, YM18L34 and EM24L34.

EL36L35A and YL24L35.

TWINTEMP^®models include accessories for thru-the-wall

installation only. Window mounting requires use of optional

accessory kit as listed above.

PErfOrMANCE dATA fOr 2009, 2008 MOdELS

EVAP. AIR TEMP. DEG. F

OPERATING PRESSURES

ELECTRICAL RATINGS

R-22 REF.

BREAKER FUSE

60 Hertz Amps

COOLING

PERFORMANCE DATA*

CONDENSER

TEMPERATURE DEG. F

Discharge Temp Suction Temp Super Heat Sub-Cooling

Voltage

Temp.

Discharge Air

Locked Rotor Charge in

Suction

Discharge

Amps Cool Amps Heat

Drop F.

Amps

OZ.

XQ05L10A-C

XQ06L10A-C

XQ08L10A-B

XQ08L10A-E

XQ10L10A-C

XQ12L10A-B

XQ12L10A-C

EQ08L11A-B

EQ08L11A-E

SS08L10-E

119

121

128

125

130

126

124

125

116

117

151

157

167

161

176

166

173

161

157

166

255

261

4.9

5.0

28.0

24.0

36.2

44.0

56.0

36.2

42.0

21.4

21.0

22.1

19.8

19.2

31.0

20.0

19.8

27.0

26.0

115

283

6.8

280

6.7

287

9.2

271

11.0

271

283

6.5

6.7

6.6

6.5

7.5

10.7

280

250-260

243

SS08L10-F

SS08L10-G

SS10L10-D

SS10L10-E

243

KS12L10-E

KS12L10-F

122

170

266

9.0

44.0

30.0

115

SS12L10-E

SS12L10-F

KS15L10-C

KS15L10-D

SS14L10-D

SS14L10-E

SS12L30-E

SS12L30-F

SS16L30-D

SS16L30-E

ES12L33-D

ES12L33-E

ES16L33-C

ES16L33-D

124

125

122

130

122

130

169

182

184

174

176

174

179

266

278

268

261

279

261

279

9.3

44.0

61.0

21.0

35.0

21.0

35.0

32.0

29.0

29.2

31.0

32.1

31.0

32.0

115

12.2

12.3

4.7

115

208 / 230

4.7

7.9

4.7

15.1

4.7

7.4

YS09L10-F

YS09L10-G

116

164

249

7.4

7.0

44.0

28.0

115

YS13L33-D

YS13L33-E

KM24L30-C

KM24L30-D

YM18L34-D

YM18L34-E

EM18L34-C

KM18L30-C

KM18L30-D

SM18L30A-D

SM18L30A-E

SM21L30-E

SM21L30-F

EM24L34-B

SM24L30-C

SM24L30-D

SL28L30-D

SL28L30-E

SL36L30A-D

SL36L30A-E

EL36L35A-D

EL36L35A-E

122

132

126

125

121

125

132

128

133

172

187

175

171

173

187

172

192

269

287

280

271

262

278

287

259

287

5.5/5.1

11.2

5.7/5.3

24.0

68.0

41.0

42.0

37.0

43.0

68.0

91.0

32.0

53.0

43.0

39.5

45.0

43.0

53.0

50.1

57.6

208 / 230

208/230

208 / 230

208/230

208 / 230

11.2

9.2/8.75

8.1

8.8/8.3

18.9

8.1

7.7/7.1

9.6/9.3

11.2

25.0

11.2

13.0

17.2

133

124

192

194

175

287

302

268

17.2

91.0

68.0

57.6

60.0

73.0

208 / 230

208/230

18.0

25.0

18.0

YL24L35-E

YL24L35-F

11.9/11.1 11.7/11.0

*Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity, all systems use R22.

ELECTrICAL dATA

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or

installation.

All electrical connections and wiring MUST be

installedbyaqualiﬁedelectricianandconformto

the National Electrical Code and all local codes

which have jurisdiction.

Failure to do so can result in personal injury or

death.

NOTICE

FIRE HAZARD

Not following the above WARNING could result in ﬁre or

electically unsafe conditions which could cause moderate

or serious property damage.

Read, understand and follow the above warning.

Wire Size

Use ONLY wiring size recommended for single outlet branch circuit.

Fuse/Circuit Breaker

Use ONLY the correct HACR type and size fuse/circuit breaker. Read electrical ratings on unit’s

rating plate. Proper circuit protection is the responsibiity of the homeowner.

Grounding

Receptacle

Unit MUST be grounded from branch circuit through service cord to unit, or through separate

ground wire provided on permanently connected units. Be sure that branch circuit or general

purpose outlet is grounded.

The ﬁeld supplied outlet must match plug on service cord and be within reach of service cord.

Do NOT alter the service cord or plug. Do NOT use an extension cord. Refer to the table above

for proper receptacle and fuse type.

The consumer - through the AHAM Room Air Conditioner Certiﬁcation Program - can

be certain that the AHAM Certiﬁcation Seal accurately states the unit’s cooling and

heating capacity rating, the amperes and the energy efﬁciency ratio.

*HACR: Heating Air Conditioning and Refrigeration

WARNING: Before operating your unit

Make sure the wiring is adequate for your unit.

If you have fuses, they should be of the time delay type. Before you install

or relocate this unit, be sure that the amperage rating of the circuit breaker

or time delay fuse does not exceed the amp rating listed in Figure 1.

WARNING

ELECTRICAL SHOCK HAZARD

Make sure your electrical receptacle has the same

configuration as your air conditioner’s plug. If

different, consult a Licensed Electrician.

Do not use plug adapters.

Do not use an extension cord.

Do not remove ground prong.

DO NOT use an extension cord.

The cord provided will carry the proper amount of electrical power to the

unit; an extension cord will not.

Always plug into a grounded 3 prong outlet.

Failure to follow these instructions can result in

electrical shock, serious injury or death.

Make sure that the receptacle is compatible with

the air conditioner cord plug provided.

This insures proper grounding. If you have a two prong receptacle you

will need to have it replaced with a grounded receptacle by a certiﬁed

electrician. The grounded receptacle should meet all national and local

codes and ordinances. Under no circumstances should you remove the

ground prong from the plug. You must use the three prong plug furnished

with the air conditioner.

CIRCUIT RATING

REQUIRED WALL

OR TIME DELAY

RECEPTACLE

FUSE

MODEL

NEMA

NO.

AMP

VOLT

SS08 • SS10 • SS12 • SS14

KS12 • KS15 • YS09 • XQ05

XQ06 • XQ08 • XQ10 • XQ12

EQ08

125

5-15R

Test the power cord

SS12 • SS16 • SM18

SM21 • KM18

All Friedrich room air conditioners are shipped from the factory with a

Leakage Current Detection Interrupter (LCDI) equipped power cord. The

LCDI device meets the UL and NEC requirements for cord connected air

conditioners.

250

6-15R

6-20R

SM24 • SL28 • KM24

YS13 • ES12 • ES16

To test your power supply cord:

SL36 • YM18 • YL24

EM18 • EM24 • EL36

250

6-30R

1. Plug power supply cord into a grounded 3 prong outlet.

2. Press RESET (See Figure 2).

Figure 1

3. Press TEST (listen for click; Reset button trips and pops out).

NOTE: Your LCDI device will resemble one of these illustrations.

4. Press and release RESET (listen for click; Reset button latches and

remains in). The power supply cord is ready for operation.

RESET

TEST

NOTE: LCDI device is not intended to be used as a switch.

RESET

Once plugged in the unit will operate normally without the need to reset

the LCDI device.

WARNING

TEST BEFORE EACH USE

1. PRESS RESET BUTTON

TEST

2. PLUG LDCI INTO POWER

RECEPTACLE

3. PRESS TEST BUTTON,

RESET BUTTON SHOULD

POP UP

If the device fails to trip when tested or if the power supply cord is

damaged it must be replaced with a new supply cord from the manufac-

turer. We recommend you contact our Technical Assistance Line at

(800) 541-6645 ext. 845. To expedite service, please have your model

and serial number available.

4. PRESS TEST BUTTON,

FOR USE

DO NOT USE IF ABOVE TEST

FAILS

WHEN GREEN LIGHT IS ON

IT IS WORKING PROPERLY

Figure 2

For the best cooling performance and highest energy efficiency

Keep the filter clean

Insulation

Make sure that your air conditioner is always in top performing condition

by cleaning the filter regularly.

Good insulation will be a big help in maintaining desirable comfort levels.

Doors should have weather stripping. Be sure to caulk around doors and

windows.

Provide good air flow

Make sure the airflow to and from the unit is clear. Your air conditioner puts the

conditioned air out at the top of the unit, and takes in unconditioned air at the

bottom. Airflow is critical to good operation. It is just as important on the outside

of the building that the airflow around the unit exterior is not blocked.

Proper installation of seal gasket

Make sure the seal gasket has been installed properly to minimize noise

and improve efﬁciency. If the seal gasket has not been installed, please

refer to Step 14 of the installation instructions.

Also, if you switch from Cool mode to Fan Only, and switch back to

COOL mode, there is a three minute delay before the compressor comes

back on.

Unit placement

If your air conditioner can beplaced in a window or wall that isshaded by atree

or another building, the unit will operate even more efficiently. Using drapes or

blinds on the sunny side of the dwelling will also add to your unit’s efficiency.

How to operate the Friedrich room air conditioner ^{(QuietMasterProgrammable)}

To start unit

If your air conditioner is installed and plugged into a proper re-

ceptacle, it is ready to go. Touch Power button once. The unit will

automatically be in Cool mode with the temperature set at 75°F

(24°C) and the fan speed at F1, the sleep setting. There is a 3-

minute delay before the compressor will turn on. (See "Automatic

Component Protection" on this page).

Should the Check Filter light turn on when you rst turn on the unit,

touch Check Filter to turn off the light. Check Filter light will come

on after 250 hours of use. Clean filter.

Figure 3

Set

Check

Filter

DISPLAY

Hour

Press to reset

Touch Check Filter to reset.

Power

To set mode of operation

When you rst turn on the unit, it will be in the Cool mode (light on),

Money

Fan

Cool

Saver

Only

with constant fan.

Mode

Temp

Fan

Touch MoneySaver^®(light on) to activate the MoneySaver^®feature.

This cycles the fan with the compressor so that the fan does not

run all the time. This saves energy and improves dehumidi cation.

(MoneySaver^®will also run the fan to sample the return air tempera-

ture if the off cycle is too long). Or you may prefer constant fan for

more air movement. To return to constant fan, touch Cool.

^OF/ ^OC

1-4

Smart

Fan

Speed

Touch Fan Only (light on) if you want only the fan to run. You may want

to use this feature in conjunction with the Fresh Air / Exhaust lever to

bring outside air into a room, or to exhaust stale air. (See page 7, "Fresh

Air and Exhaust Control" for more information.)

A/C

Timer

Stop

Start

On/Oꢀ

Timer

To adjust temperature[60°F (16°C) to 90°F (32°C)]

COOLER–Touch and hold until the display shows the desired

room temperature.

WARMER– Touch

and hold until the display shows the desired

To set the timer

NOTE: Set Hour clock before attempting to set timer functions.

room temperature.

FAHRENHEIT/CELSIUS–Touch ºF/ºCtoshowthetemperature

in Celsius, touch again to show Fahrenheit.

You can set the A/C Start and A/C Stop timer a minimum of one hour

apart and a maximum of 23 hours apart.

To adjust fan speed

TIMER STOP - Press the A/C Stop button and continue pressing

until the hour you want the unit to shut off appears in the display

(A.M. or P.M.). The stop time for cooling will then be set.

Touch 1-4 Speed to see current setting. Touch again to change

speed. F1 is the lowest setting (SLEEP SETTING), F2 is low speed

(LOW), F3 is medium speed (MED), F4 is high speed (HIGH).

START TIME - Press A/C Start to view the current start time for

cooling. Continue pressing until the hour you want the unit to start

appears in the display (A.M. or P.M.). The start time for cooling will

then be set.

To activate smart fan

Touch Smart Fan (light on). Smart Fan will adjust the fan speed

automatically to maintain the desired comfort level. For example,

if the outside doors in your home are open for an extended period

of time, or more people enter a room, Smart Fan may adjust to a

higher fan speed to compensate for the increased heat load. This

keeps you from having to adjust the fan speed on your own. Smart

Fan cannot be activated in the Fan Only mode.

Press the Timer On/ Off button once to activate (light on) the timer

function. Touch Timer On/ Off again (light off) to cancel the timer

function if you so desire. Once the on and off times have been se-

lected, they will remain in memory, and cycle daily until changed.

NOTE: If unit is unplugged or power is interrupted, the Set Hour button

must be reset or the Timer On/ Off functions will not work.

To deactivate smart fan

Touch 1-4 Speed, and select your desired fan speed.

Automatic component protection

Your unit is equipped with Automatic Component Protection.

To set hour clock

Press Set Hour once to see the current clock setting. Continue

pressing the button until the hour closest to the actual time appears

in the display.

To protect the compressor of the unit, there is a three minute time delay if you

turn the unit off or if power is interrupted. The fan will not be affected.

MAKE SURE YOU SET A.M. AND P.M. PROPERLY. A light will appear in

the upper left corner of the display when the hour is P.M.

NOTE: Minutes will NOT show on display.

How to use the remote control (QuietMasterProgrammable)

To start unit

To set the timer

POWER - Press the Power button once. The unit will automatically

turn on in the mode and fan speed it was last left on.

NOTE: Set the hour clock before attempting to set timer functions. You

can set the timer On/Off a minimum of one hour apart, and a maximum

of 23 hours apart.

To set mode of operation

TIMER START - Press Start to view the current start time for cool-

ing. Continue pressing the Start button until you arrive at the start

time you desire. The start time for cooling will then be set.

COOL - Press the Cool button to automatically switch the operating

mode to COOL.

TIMER STOP - Press the Stop button. Continue pressing the Stop

button until you arrive at the stop time you desire. The stop time for

cooling will then be set.

FAN ONLY - Press the Fan Only button if you want to run the fan only.

You may want to use this feature in conjunction with the Fresh Air/

Exhaust if you want to bring outside air into the room, or exhaust stale

air.

TIMER ON/OFF - Press the On/off button once to activate (light on)

or deactivate (light off) the timer. Once the Start and Stop times

have been selected, they will remain in memory, and cycle daily until

changed.

MoneySaver^®- Press the MoneySaver^®button to activate the

MoneySaver^®feature. This cycles the fan with the compressor so

that the fan does not run all the time.

NOTE: If the unit is unplugged or the power is interrupted, the HOUR

CLOCK must be reset or the Timer On/off functions will not work.

To adjust temperature

COOLER - Press the

Cooler button to raise the temperature

setting.

WARMER - Press the

setting.

Warmer button to lower the temperature

Figure 4

To adjust fan speed

FAN SPEED - Press the Fan Speed button to see the current set-

ting. Press again to change the fan speed. F1 is the lowest setting

(SLEEP SETTING), F2 is low speed (LOW), F3 is medium (MED),

and F4 is high (HIGH).

Temperature

Cooler

Warmer

Power

Cool

To set the hour clock

Fan

Money

Saver^®

SETHOURCLOCK- PressSetHouronce to see the current clock set-

Only

Speed

ting. Continue pressing the button until you arrive at the current time.

Timer Operation

On/Oꢀ Start

Stop Set Hr.

MAKE SURE YOU SET THE A.M. AND P.M. PROPERLY. (NOTE:

MINUTES ARE NOT SHOWN ON THE DISPLAY.) A light will appear in

the upper left corner of the display when the hour is P.M.

A Friedrich RC1 wireless remote control can be used to operate all

QuietMaster_®Programmable models.

How to operate the Friedrich room air conditioner (XQ models)

To start unit

Figure 5

If your air conditioner is installed and plugged into a proper receptacle, it is

ready to go. The firsttimethe unit is started, thecompressorwilldelay for three

minutes. See Automatic Component Protection on the following page.

Touch the Power button once. The unit will automatically be in Cool

mode with the temperature set at 75°F (24°C) and the fan speed at

F1, the sleep setting.

Power

Cool

To set mode of operation

Fan

Money Saver

Speed

Mode

When you rst turn the unit on, it will be in the Cool mode (light on), with

Fan Only

constant fan.

Clock

Timer

Set

Touch the Mode button once to activate the MoneySaver^®(light on).

Start Time

Stop Time

Hour

Temp/Hour

MoneySaver^®is a feature that cycles the fan with the compressor

so that the fan does not run all the time. This saves energy and

improves dehumidi cation. Or you may prefer constant fan for more

air movement (to return to constant fan, touch the Mode button two

more times).

10 11 12

In order to run the fan by itself, do the following:

To set the hour clock

Continuing fromMoneySaver^®mode (light on), touchtheModebutton

once to activate the FAN ONLY feature (light on).

Touch the Set Hour button to see the current setting (clock light

comes on). The number that is displayed is the approximate time

The FAN ONLY setting will circulate air in the room without the com-

(hour only). Use the and

buttons to change the settings. BE

pressor coming on.

SURE TO SET A.M. AND P.M. ACCORDINGLY. (P.M. is indicated

by a red light in the upper left corner of the display).

To adjust temperature

Use the Mode button to select either the COOL or MoneySaver^®

function

To set the timer

NOTE: Set the HOUR CLOCK before attempting to set timer functions.

You can set the START and STOP times a minimum of one hour apart, and

a maximum of twenty-three hours apart.

COOLER – Touch the

button to lower the room air temperature.

button to raise the room air temperature.

and buttons at the same time to switch the

WARMER – Touch the

After setting the time, press the Set Hour button once (Start light

comes on). Use the

and

buttons to select the time that the

Press both the

temperature readout from Fahrenheit (°F) to Celsius (°C).

unit will START.

Repeat step 7 to switch from °C back to °F.

After selecting the STARTtime, press theSetHourbutton once more

(Stop light comes on). Use the and buttons to select the time

To adjust fan speed

that the unit will STOP. After selecting the stopping time, press the

Set Hour button once.

Touch the FanSpeedbutton to see the current setting. Touch it again

to change speed. F1 is the lowest setting (SLEEP SETTING / LOW),

F2 is MEDIUM, and F3 is HIGH.

Press the Timer On/Off button (light turns on) to activate the timer

function. To deactivate this function, press theTimer On/Off button

once again (light turns off). Once the on and off times have been

selected, they will remain in memory and cycle daily until changed.

To activate Smart Fan

NOTE: If the unit is unplugged or the power is interrupted, the HOUR

must be reset or the Timer On/Off will not function when desired.

There is a fourth option, SF, when selecting the fan speed. This is

the SMART FAN function. SMART FAN DOES NOT OPERATE IN

CONJUCTION WITH THE FAN ONLY MODE.

Automatic component protection

Smart Fan will adjust the fan speed automatically to maintain the

desired comfort level. For example, if the outside doors in your home

are opened for an extended period of time, or more people enter a

room, Smart Fan may adjust to a higher fan speed to compensate

for the increased heat load. This keeps you from having to adjust the

fan speed on your own.

Your unit is equipped with Automatic Component Protection. To protect the

compressor of the unit, there is a three minute start delay if you turn the unit

off or if power is interrupted. The fan operationwill not be affected. Also, if you

switch from Cool mode to Fan Only, and switch back to Cool mode, there

is a three minute delay before the compressor comes back on.

How to use the remote control ^{(XQ models)}

To start unit

To set the timer

NOTE: You can set the START and STOP times a minimum of one hour

POWER - Press the Power button once. The unit will automatically

start in the mode and fan speed it was last left on.

apart, and a maximum of 23 hours apart.

TIMER START - Press Start to view the current start time for cooling.

Continue pressing the Start button until you arrive at the start time

you desire. The start time for cooling will then be set.

To set mode of operation

COOL - Press the Cool button to automatically switch the operating

mode to COOL.

TIMER STOP - Press the Stop button. Continue pressing the Stop

button until you arrive at the stop time you desire. The stop time for

cooling will then be set.

FAN ONLY - Press the Fan Only button if you want to run the fan

only.

TIMER ON / OFF - Press the On/Off button to activate (light on) or

deactivate (light off) the timer. Once the on and off times have been

selected, they will remain in memory and cycle daily until changed.

MoneySaver^®- Press the MoneySaver^®button to activate the

MoneySaver^®feature. This feature cycles the fan with the compres-

sor so that the fan does not run all the time.

NOTE: If the unit is unplugged or the power is interrupted, the Set Hr.

function must be reset or the On/Off function will not work.

To adjust temperature setting

WARMER - Press the Warmer button to raise the temperature

setting.

Figure 6

COOLER - Press the Cooler button to lower the temperature

setting.

Temperature

Cooler

Warmer

Power

To adjust fan speed

Cool

Fan

Money

Saver^®

FAN SPEED - Press the Fan Speed button to see the current set-

ting. Press again to change the fan speed. F1 is the lowest setting

(SLEEP / LOW), F2 is MEDIUM, F3 is HIGH, and SF is the SMART

FAN setting.

Only

Speed

Timer Operation

On/Oꢀ Start

Stop Set Hr.

To set the hour clock

SET HOUR CLOCK - Press Set Hr. once to see the current clock

setting. Continue pressing the button until you arrive at the current

time (Hour only). Minutes are not shown on the display. Make sure

that the A.M. / P.M. setting is correct.

Additional RC1 wireless remote controls can be purchased from your Friedrich dealer.

How to operate the Friedrich room air conditioner

(QuietMaster / Twintemp models)

To start unit

If your air conditioner is installed and plugged into a properly grounded

receptacle, it is ready to operate.

Mode control (QuietMaster)

The upper dial (Figure 7) allows you to select cooling at four different

speeds, as well as Fan Only (Models SL28 and SL36 only have three

cooling speeds.).

Oꢀ

Fan

Only

Sleep

Setting

Off - to turn the unit off.

High Cool - for quick cooling.

Medium Cool - to maintain a desired temperature.

Low

Cool

High

Cool

Low Cool - when cooling demand is low.

Sleep Setting - for nighttime use, or when cooling demand is low.

Fan Only - to circulate air in the room without the compressor coming on.

Medium

Cool

TheFan Only setting can also be used withtheExhaust airsettingtoremove

stale air or smoke from the room; or it can be used with theFresh Air setting

to bring outside air into the room. This is especially useful in the spring and fall

when cooling may not be necessary. The Fresh Air and Exhaust controls

are in the upper air discharge area. The center position of this control is the

normal, or closed position, which recirculates air for maximum performance

in the cooling mode.

Yes

Money Saver^®

Mode control (Twintemp)

MIN

MAX

This dial allows you to select cooling or heating at three different speeds,

Figure 7

as well as Fan Only (Figure 8).

Allow 3 min. between restarts

Off - to turn the unit off.

High Cool or High Heat - for quick response.

Medium Cool or Medium Heat - to maintain a desired temperature.

Low Cool or Low Heat - for nighttime use, or when demand is low.

Fan Only - to circulate air in the room without the compressor coming on.

The Fan Only setting can also be used with the Exhaust air setting to

remove stale air or smoke from the room, or it can be used with the Fresh

Air setting to bring outside air into the room, especially in the spring and

fall when cooling isn’t necessary.

Fan

Only

Oꢀ

The Fresh Air and Exhaust controls are in the upper air discharge area.

The center position of this control is the normal, or closed position, which

recirculates air for maximum performance in the cooling mode.

Low

Cool

Heat

Med

Heat

Med

Cool

NOTE: You may notice an odor when ﬁrst activating the heat when the

electric heat element comes on. This is due to dust burning off that may

have gathered on the coil during the summer. This is normal.

High

Heat

High

Cool

Temperature control

The bottom dial on the control panel is the thermostat. Turn it clockwise

for cooler temperature and counterclockwise for warmer.

Yes

MoneySaver^®

Money Saver^®switch

This rocker switch can be depressed to either Yes or No. In the Yes position

you will get the most economical operation. Both the fan and compressor

will cycle on and off together, maintaining the selected temperature at a

more constant level and reducing the humidity more efﬁciently in the cooling

mode. This control will only operate when the unit is in cooling or heating

mode. In the No position, the fan will run constantly as long as the unit is

in the cooling or heating mode.

MAX

COOL

MAX

HEAT

Figure 8

Allow 3 min. between restarts

NOTE: The YS09 is a 115 volt model and does not provide adequate heat

below 37°F (3°C). This product is designed for warm climate applications.

EQ08 models

Function Control

The left knob is a six position control that allows you to

select heat or cool in either low speed or high speed. Plus

you can select fan only if you wish.

MAX

HEAT

High

Heat

Fan

Only

Low

High

Cool

Function Control

The right hand knob is the thermostat - turn it clockwise for

cooler, counter-clockwise for warmer (See Figure 9).

Heat

MAX

Low

Cool

COOL

Allow 3 min. between restarts

FIGURE 9

Power

Set

Check

Filter

Hour

Cool

Press to reset

Fan

Money Saver

Speed

Mode

Fan Only

Power

Clock

Timer

Set

Start Time

Stop Time

Hour

Money

Fan

Te mp/Hour

Cool

Saver

Only

Mode

Temp

Fan

^OF/ ^OC

FIGURE 10

TESTING THE ELECTRONIC CONTROL

BOARDS FOR QME & XQ MODELS

1- 4

Smart

Fan

Speed

Checking Room Temperature:

A/C

Timer

1. Check the room temperature at the electronic control

pad by pressing the “FAN SPEED” button and the

temperature“UP”buttonatthesametimeonXQmodels.

Stop

Start

Timer

2. Check the room temperature at the electronic control

pad by pressing at the same time the “FAN SPEED”

button and the “TEMP ” button on QME models.

FIGURE 11

Theindoortemperaturewilldisplayfor10seconds.Indoor

temperature can be viewed in all modes, including the

TEST mode. The display can be changed back to SET

temperature by pressing any key, except the ON/OFF

button, or after 10 seconds has elapsed.

Test Mode has duration of 90 minutes. Test Mode

can be activated under any conditions, including

Off. Test Mode is cancelled by pressing the On/Off

button, unplugging the unit, or when the 90 minutes

is timed out. All settings revert to the factory default

settings of Cool, 75 degrees F, Timer and Set Hour

features are nonfunctional.

Activating Test Mode:

Activate test mode by pressing at the same time the

“MODE” button and the “TEMP

” button on XQ

models. LEDs for Hour, Start, and Stop will blink 1 bps

while Test Mode is active.

Test Mode overrides the three-minute lockout, all

delays for compressor and fan motor start / speed

change, and no delay when switching modes.

Activate test mode by pressing at the same time the

“MONEY SAVER” button and the “CHECK FILTER”

button on QME models. LED for the Filter Alert will blink

1 bps while Test Mode is active.

Test Mode default settings are ON, Money Saver,

60 degrees F, and High fan speed.

Activating Error Code Mode: (Submode of Test Mode)

E6 INDOOR PROBE SHORT: Control assumes

ambient temperature is 90 degree F and unit will

operate. Replace probe.

Unit must be in Test Mode to enter Error Code Mode

1. Activate Error Code Mode by pressing the “TIMER ON/

OFF” button on XQ models. LED for the “TIMER ON/

OFF” will ﬂash 1 bps while Error Code Mode is active.

NOTE: All Error Code displays for Frost & Indoor Probe

will allow unit to operate. Unit may or will ice up if faulty

components not replaced.

Pressing the “TEMP/HR

Consecutive presses will scroll through all error codes

logged. Press the “TEMP/HR ” button to see the

” button will display 00.

FROST PROBE SENSOR: disables compressor at 35

reverse order of all error codes logged. When the end of

logged error codes is reached the temperature set point

will appear.

degrees F.

INDOOR PROBE SENSOR: Control range is 60

degrees F to 90 degrees F +/- 2 degrees F.

Activate Error Code Mode by pressing at the same time

the “A/C START” button and the “ON/OFF” button on

QME models. LED for the “TIMER ON/OFF” will ﬂash

1 bps while Error Code Mode is active. Pressing the

“TEMP ” button will display 00. Consecutive presses

will scroll through all error codes logged. Press the

Indoor temperature will be displayed by pressing:

(QME units) The Fan Speed button and the

Temperature

button.

“TEMP

” button to see the reverse order of all error

(XQ units) The Fan Speed button and the “TEMP

“

codes logged. When the end of logged error codes is

reached the temperature set point will appear.

button.

The indoor temperature will be displayed for 10

seconds. The display will change back to the Set Point

temperature by pressing any key button except for the

On/Off button. The indoor temperature can be viewed

in all modes, including test mode.

IMPORTANT: ErrorCodesareclearedfromthelog by

exiting from Error Code Mode. To exit on XQ models,

press Timer On/Off button. To exit QME models,

press A/C Start and On/Off buttons. Or unplug unit to

exit Error Code Mode. Plug unit in after 5 seconds to

resume normal operation of unit.

Check Filter: The Check Filter indicator turns on after

the fan motor has been operating for 250 hours. The

Check Filter indicator is reset by pressing the Check

Filter button one time only. Power failures will not reset

the 250 hour timer. All time elapsed is stored in memory

and resumes counting after power is restored.

TESTING THE ELECTRONIC CONTROL

ERROR CODE LISTINGS

Keep Alive: The electronic control has a memory to

retain all functions and status as set up by the user in

the event of a power failure. Once power is restored

to the unit there is a two second delay before the fan

comes on and approximately three minutes delay

before the compressor is activated, providing that the

mode was set for cooling and the set point temperature

has not been met in the room.

E1 SHORT CYCLE SITUATION: Deﬁned as (compressor

powered on before the three minute time delay ten times in

one hour. Investigate and correct short cycling problem.

E2 KEYBOARD STUCK ERROR: If key button(s) are

pressed continuously for twenty seconds or more. If MODE

key is stuck, unit will default to cool. Exit Error Code

Mode to see if error “E2” is no longer displayed and unit is

functioning. Replace board if “E2” still displays after exiting

Error Code Mode.

E3 FROST PROBE OPEN: Normal operation is allowed.

Ohm frost probe. Replace probe if ohm value not read. If

ohm value is present replace board.

E4 FROST PROBE SHORT: Normal operation allowed.

Replace probe.

E5 INDOOR PROBE OPEN: Control assumes indoor

ambient temperature is 90 degree F and unit will operate.

Ohm indoor probe. Replace probe if ohm value not read.

TESTING ThE rOTArY CONTrOL SWITChES

(Heat Pump & Electric Heat Models) (See Figure 12)

An eight position control switch is used to regulate the

operation of thefan motor and compressor. The compressor

can be operated with the fan operating at low, medium or

high speed in the cooling or heating mode. The fan motor

can also be operated independently on medium speed. See

switch section as indicated on decorative control panel.

3. “ Med Cool” Position - between terminals “C” and “3”,

“C2” and “2”, “M” and “M/S”, “AR” and “5”.

4. “ Hi Cool” Position -between terminals “C” and “3”, “C2”

and “2”, “H” and “M/S”, “AR” and “5”.

5. “ Hi Heat” Position - between terminals “C” and “1”, “C2”

and “4”, “H” and “M/S”, “AR” and “5”.

NOTE: Heat pump models with electric heat - in the heat

position, heating element only will be energized when

outdoor temperature is below the operating range of the

heat pump.

6. “ Med Heat” Position - between terminals “C” and “1”,

“C2” and “4”, “M” and “M/S”, “AR” and “5”.

7. “ Lo Cool” Position - between terminals “C” and “1”, “C2”

and “4”, “LO” and “M/S”, “AR” and “5”.

Figure 12

System Control Panel

Heat Pump & Electric Heat Models

(YS, ES, YM, EM, YL & EL)

8. “ Fan Only” Position - between terminals “L1” and “M”.

Figure 13

System Control Switc

(Heat Pump / Electric

Heat Model

Fan

Only

Low

Heat

Low

Cool

Med

Heat

Med

Cool

High

Heat

High

Cool

KS, KM, SL Models (See Figure 14)

MoneySaver^®

A six position control switch is used to regulate the operation

of the fan motor and compressor. The compressor can be

operated with the fan operating at low, medium or high

speed. The fan motor can also be operated independently

on medium speed. See switch section as indicated on

decorative control panel.

Yes

MAX

COOL

MAX

HEAT

Figure 14

Allow 3 min. between restarts

System Control Panel (KS, KM, SL)

WARNING

Fan

Only

Sleep

Setting

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

Low

Cool

High

Cool

Medium

Cool

Yes

Money Saver^®

SYSTEM CONTROL SWITCH - TEST

(See Figure 13)

Disconnect leads from control switch. Turn control to position

being tested. There must be continuity as follows:

1. “ Off” Position - no continuity between terminals.

MIN

MAX

2. “ Lo Cool” Position - between terminals “C” and “3”, “C2”

Allow

min. between restarts

and “2”, “LO” and “M/S”, “AR” and “5”.

SYSTEM CONTROL SWITCH - TEST (See Figure 15)

Disconnect leads from control switch. There must be

continuity as follows:

Vent door Allows introduction of fresh air into the room

and/or exhausts stale room air outside (on select models.)

1. “Off” Position - no continuity between terminals.

Plenum assembly Diffuser with directional louvers used

to direct the conditioned airﬂow.

2. “Lo Cool” Position - between terminals “L1” and “C,” “LO”

and “MS.”

Blower wheel Attaches to the indoor side of the fan motor

shaft and is used for distributing unconditioned, room side

air though the heat exchanger and delivering conditioned

air into the room.

3. “Med Cool” Position - between terminals “L1” and “C,” “M”

and “MS.”

4. “Hi Cool” Position - between terminals “L1” and “C,” “H”

and “MS.”

Slinger fan blade Attaches to the outdoor side of the fan

motor shaft and is used to move outside air through the

condenser coil, while slinging condensate water out of the

base pan and onto the condenser coil, thus lowering the

temperature and pressures within the coil.

5. “Fan Only” Position - between terminals “L1” and “2.”

Figure 15

System Control Switch

ELECTRICAL COMPONENTS

Thermostat Used to maintain the speciﬁed room side

comfort level

System switch Used to regulate the operation of the fan

motor, the compressorortoturnthe unitoff. Fortroubleshoot-

ing, refer to the wiring diagrams and schematics in the back

of this service manual.

Capacitor Reduces line current and steadies the voltage

supply, while greatly improving the torque characteristics of

the fan motor and compressor motor.

“EQ08” SYSTEM CONTROL SWITCH – TEST

(See Figure 16)

Turn knob to phase of switch to be tested. There must be

continuity as follows:

Defrost thermostat (Heatpumps only)

A dual purpose

control that acts as an outdoor thermostat and defrost

control.

1. “Fan Only” Position – between terminals “MS” and “H”

Smart Fan

tain the desired room temp.

MoneySaver^®switch When engaged, it sends the power

supply to the fan motor through the thermostat, which allows

for a cycle-fan operation.

Automatically adjusts the fan speed to main-

2. “Hi Cool” Position – between terminals “L1” and “C” and

“MS” and “H”

3. “Low Cool” Position – between terminals “L1” and “C”

and “MS” and “LO”

Fan Motor Dual-shafted fan motor operates the indoor

blower wheel and the condenser fan blade simultaneously.

4. “Low Heat” Position – between terminals “L2” and “2”

and “MS” and “LO”

Solenoid Used to energize the reversing valve on all heat

pump units.

5. “Hi Heat” Position – between terminals “L2” and “2” and

“MS” and “H”

Heatingelement Electricresistanceheater, availablein3.3,

4.0 or 5.2 kW on select TwinTemp^®models.

Figure 16

Heat anticipator Used to provide better thermostat and

room air temperature control.

System Control Switch

(EQ Models)

HERMETIC COMPONENTS

Compressor Motorizeddeviceusedtocompressrefrigerant

through the sealed system.

Reversing valve A four-way switching device used on all

heat pump models to change the ﬂow of refrigerant to permit

heating or cooling.

FUNCTIONAL COMPONENT DEFINITIONS

MECHANICAL COMPONENTS

Check valve A pressure-operated device used to direct the

ﬂow of refrigerant to the proper capillary tube, during either

the heating or cooling cycle.

Bellows condensate valve Temperature-sensitive valve

thatopens up todrain offcondensatewater when theoutside

temperature falls below 40°F and closes when the outside

temperature reaches 58°F.

Capillarytube Acylindrical meter deviceusedto evenly dis-

tribute the ﬂow of refrigerant to the heat exchangers (coils.)

COMPONENTS TESTING

THERMOSTAT (“EQ08” Models) (See Figure 17)

This thermostat is single pole-double throw, cross ambient

with a range of 60° to 92°F and a differential of ±2°F. Terminal

“2” is common.

In the heating cycle, the heat anticipator is energized to

supply a small amount of heat during the “on” cycle. This

will open the contacts in the thermostat prematurely to

maintain a closer differential between the “cut in” and “cut

out” temperature. The heat anticipator is energized in the

heating mode regardless of whether fan is placed in the

automatic (MoneySaver) or constant run position.

Figure 17

Thermostat

(EQ Model)

RANGE:

Thermostat Properties

60°F (±2°) to 92°F (±2°)

TEST:

Cooling/Heating Models: Remove wires from thermostat

and check continuity between terminal “2” (common) and

“3” for cooling. Check between terminals “2” (common)

and “1” for heating. Also check that contacts in thermostat

open after placing in either position. NOTE: Temperature

must be within range listed to check thermostat. Refer to

the troubleshooting section in this manual for additional

information on thermostat testing.

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

THERMOSTAT ADJUSTMENT

No attempt should be made to adjust thermostat. Due

to the sensitivity of the internal mechanism and the

sophisticated equipment required to check the calibration,

it is suggested that the thermostat be replaced rather than

calibrated. Thermostat bulb must be straight to insure

proper performance.

TEST:

1. Remove leads from thermostat.

2. Turn thermostat knob clockwise to its coldest

position.

3. Test for continuity between the two terminals. Contacts

should be closed.

Figure 18

Thermostat

4. Turn thermostat knob counterclockwise to its warmest

position.

5. Test for continuity - contacts should be open.

NOTE: The thermostat must be within the temperature

range listed to open and close.

To maintain the comfort level desired, a cross ambient type

thermostat is used. The thermostat has a range from 60°

±2°F to 92° ±3°F. The thermostat bulb is positioned in front

of the evaporator coil to sense the return air temperature.

Thermostat malfunction or erratic operation is covered in

the troubleshooting section of this manual.

THERMOSTAT BULB LOCATION

The position of the bulb is important in order for the

thermostat to function properly. The bulb of the thermostat

should be located approximately 45° to a maximum of 60°

from horizontal. Also, do not allow the thermostat bulb to

touch the evaporator coil. (See Figures 17 and 18)

THERMOSTAT - Models ES, YS, EM, YM, EL, YL

A cross ambient thermostat is used on all heat pump and

electric heat units. In addition to cycling the unit in a heating

or cooling operation, the thermostat will terminate the

cooling cycle in the event ice forms on the evaporator coil,

in this case the thermostat functions as a de-ice control. A

resistor (anticipator) is positioned within a plastic block to

supply a small amount of heat to the bulb area to prevent

long “off cycles” in the “Cool-Fan Auto” (MoneySaver)

position. A current feedback through the fan motor windings

during “off cycle” completes the circuit to the resistor.

Figure 19

Thermostat Bulb Location

(EQ Model)

Thermostat sensor holder 020

to be positioned between the

4th and 5th and 6th and 7th

rows of tubes from the bottom

of the coil at dimension shown

COMPONENTS TESTING (Continued)

RESISTOR: Heat Anticipator (See Figure 20)

Failure of the resistor will cause prolonged “off” and “on”

cycles of the unit. When replacing a resistor, be sure and use

the exact replacement. Resistor ratings are as follows:

Figure 21

Defrost Thermostat

(Heat Pump Models)

115 Volt - 5,000 ohms 3 watt

230 Volt - 20,000 ohms 3 watt

Figure 20

Resistor

DEFROST BULB LOCATION (Heat Pump Models

Only) (See Figure 22)

The defrost control bulb must be mounted securely and in

the correct location to operate properly.

DEFROST THERMOSTAT (Heat Pump Models Only)

(See Figure 21)

Figure 22

Defrost Thermostat Bulb

Location (All Heat Pump Models)

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

Retainer

This thermostat is single pole - double throw with contacts

between terminals “2” and “3” closing on temperature rise

and contacts between terminals “2” and “1” closing on

temperature fall. When the contacts between terminals “2”

and “1” make, power is supplied to the heater element.

Slide the bulb

end of the

thermostat

defrost under

the retainer as

shown

This control is dual purpose control that acts as an outdoor

thermostat and defrost control.

When the sensing bulb, attached to the outdoor coil,

senses enough icing on the outdoor coil, it will interrupt

power to the compressor and supply power to the heating

element until the coil temperature reaches above 43°, then

the heater will shut off and the unit will resume operating in

the reverse cycle mode.

When the outdoor coil temperature drops below 20°, the

unit will operate in electric heat mode continuously until the

outdoor coil temperature rises above 43°.

The fan motor will not turn off when defrost occurs, and the

4-way valve will not reverse.

COMPONENTS TESTING (Continued)

FAN MOTOR

Asingle phase permanentsplit capacitor motor is usedto drive

the evaporator blower and condenser fan. A self-resetting

overload is located inside the motor to protect against high

temperature and high amperage conditions. (See Figure 23)

Many motor capacitors are internally fused. Shorting the

terminals will blow the fuse, ruining the capacitor. A 20,000

ohm 2 watt resistor can be used to discharge capacitors

safely. Remove wires from capacitor and place resistor

across terminals. When checking a dual capacitor with

a capacitor analyzer or ohmmeter, both sides must be

tested.

WARNING

ELECTRIC SHOCK HAZARD

Capacitor Check with Capacitor Analyzer

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

The capacitor analyzer will show whether the capacitor is

“open” or “shorted.” It will tell whether the capacitor is within

its micro farads rating and it will show whether the capacitor

is operating at the proper power-factor percentage. The

instrument will automatically discharge the capacitor when

the test switch is released.

FAN MOTOR - TEST

1. Determine that capacitor is serviceable.

2. Disconnect fan motor wires from fan speed switch or

system switch.

Capacitor Connections

The starting winding of a motor can be damaged by a

shorted and grounded running capacitor. This damage

usually can be avoided by proper connection of the running

capacitor terminals.

3. Apply “live”testcordprobesonblackwire andcommon

terminal of capacitor. Motor should run at high speed.

4. Apply “live” test cord probes on red wire and common

terminal of capacitor. Motor should run at low speed.

From the supply line on a typical 230 volt circuit, a 115 volt

potential exists from the “R” terminal to ground through a

possible short in the capacitor. However, from the “S” or

start terminal, a much higher potential, possibly as high as

400 volts, exists because of the counter EMF generated

in the start winding. Therefore, the possibility of capacitor

failure is much greater when the identiﬁed terminal is

connected to the “S” or start terminal. The identiﬁed

terminal should always be connected to the supply line, or

“R” terminal, never to the “S” terminal.

5. Apply “live” test cord probes on each of the remaining

wires from the speed switch or system switch to test

intermediatespeeds. Ifthecontrolisinthe“MoneySaver”

mode and the thermostat calls for cooling, the fan will

start-thenstopafterapproximately2minutes;thenthe

fan and compressor will start together approximately 2

minutes later.

Figure 23

Fan Motor

When connected properly, a shorted or grounded running

capacitor will result in a direct short to ground from the “R”

terminal and will blow the line fuse. The motor protector

will protect the main winding from excessive temperature.

Dual Rated Run Capacitor Hook-up

CAPACITOrS

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before servicing.

Discharge capacitor with a 20,000 Ohm 2 Watt

resistor before handling.

FIGURE 24

Failure to do so may result in personal injury,

or death.

COMPONENTS TESTING (Continued)

HEATING ELEMENT (See Figure 25)

DRAIN PAN VALVE

All heat pumps and electric heat models are equipped with

a heating element with the exception of models starting

with YS09. The “YS” and “ES” models are equipped with a

3.3 KW element. The “YM” and “EM” models are equipped

with a 4.0 KW element. The “YL” and “EL” models are

equipped with a 5.2 KW element. The EQ08 has a 1.15

KW element.

(See Figure 26)

During the cooling mode of operation, condensate which

collects in the drain pan is picked up by the condenser fan

blade and sprayed onto the condenser coil. This assists

in cooling the refrigerant plus evaporating the water.

During the heating mode of operation, it is necessary that

water be removed to prevent it from freezing during cold

outside temperatures. This could cause the condenser

fan blade to freeze in the accumulated water and prevent

it from turning.

Figure 25

Heating Element

To provide a means of draining this water, a bellows type

drain valve is installed over a drain opening in the base

pan.

This valve is temperature sensitive and will open when

the outside temperature reaches 40°F. The valve will

close gradually as the temperature rises above 40°F to

fully close at 60°F.

The heating element contains a fuse link and a heater limit

switch. The fuse link is in series with the power supply and

will open and interrupt the power when the temperature

reaches 199°F or a short circuit occurs in the heating

element. Once the fuse link separates, a new fuse link

must be installed.

Figure 26

Bellows Assembly

Drain Pan Valve

NOTE: Always replace with the exact replacement.

The heater element has a high limit control. This control

is a bimetal thermostat mounted in the top of the heating

element.

Should the fan motor fail or ﬁlter become clogged, the high

limit control will open and interrupt power to the heater

before reaching an unsafe temperature condition.

dEfrOST ThErMOSTAT OPErATION

hEAT PUMP WITh ELECTrIC hEAT:

YS, YM ANd YL MOdELS

The control is designed to open at 110°F ±6°F. Test

continuity below 110°F and for open above 110°F.

This control is dual purpose control that acts as an outdoor

thermostat and defrost control.

HEATING ELEMENT (Heat Pump Models)

The heating element for the “Y” model is energized by

an outdoor thermostat. The outdoor defrost thermostat is

adjusted at a predetermined temperature to bring on the

heating element and turn off the compressor. The room

thermostat will then control the cycling of the element when

the selected indoor temperature is reached.

When the sensing bulb, attached to the condenser coil,

senses enough icing on the outdoor coil, it will interrupt

power to the compressor and supply power to the electric

heating element until the coil temperature reaches above

43°, then the electric heater will shut off and the unit will

resume operating in the reverse cycle mode.

TESTING THE HEATING ELEMENT

When the outdoor coil temperature drops below 20°, the

unit will operate in electric heat mode continuously until

the outdoor coil temperature rises above 43°.

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

The fan motor will not turn off when defrost occurs, and

the 4-way valve will not reverse.

Testing of the elements can be made with an ohmmeter

across the terminals after the connecting wires have been

removed. A cold resistance reading of approximately 10.11

ohms for the 1.15 KW heater, 14.5 ohms for the 3.3 KW

heater, 11.9 ohms for the 4.0 KW heater and 9.15 ohms for

the 5.2 KW heater should be registered.

ELECTrONIC CONTrOL SEQUENCE Of OPErATION

PrOGrAMMABLE

QME

ANd XQ MOdELS

Mode Control

The mode control pad(s) allow the selection of the operating

modes of the unit.

thermostat remains satisﬁed for more than approximately 9

minutes, the fan will turn on for a period of 90 seconds for

air sampling. Operation in MONEY SAVER mode will light

both the MONEY SAVER and COOL indicators.

There is a two second delay before the mode activates its

appropriate relay.

FAN ONLY Mode

When in the FAN ONLY mode, the compressor will not

operate. The fan will run continuously at the user-selected

speed (see “Fan Speed Set” below). Smart Fan is not

available in FAN ONLY Mode.

OPERATING SEQUENCE / CHARACTERISTICS

AND FEATURES

Compressor Operation

The run state of the compressor is determined by the

difference between the indoor ambient temperature and

the set temperature. See speciﬁc mode of operation for

details.

Fan Speed Set

SS/SM fan speed is changed by pressing SPEED 1-4

pad and scrolling through F1, F2, F3, and F4 in the digital

display.

Compressor Time Delay: 180 seconds

This feature is initiated every time the compressor is de-

energized, either due to:

XQ fan speed is changed by pressing FAN SPEED pad

and scrolling through F1, F2, F3 and SF (Smart Fan) in the

digital display.

(1) satisfying the temperature set point

(2) changing mode to fan only

(3) a power interruption or

Therewillbea2seconddelaybeforethefanspeedchanges

to prevent unnecessary switching of the relays during fan

speed selection.

(4) turning the unit off

The compressor is also time delayed for 3 minutes when the

control is ﬁrst plugged in or power is restored after failure.

When the compressor cycles off as a result of satisfying the

“load”, the time delay is typically timed out during the off

cycle. Compressor time delay is bypassed by “Test Mode”.

SMART FAN

On the SS/SM models, smart fan is activated by pressing

the SMART FAN button. On the XQ model, smart fan is

activated by pressing the FAN SPEED button and scrolling

through speeds until “SF” appears in the digital display.

Using the remote control, Smart Fan is selected by the

fourth push of Fan Speed button.

Return Air Temperature Sensor

The control range is 60°F to 90°F +/- 2.0°F.

Smart fan changes fan speeds based on the temperature

differential between the ambient and set temperatures.

Frost Protection Sensor

Temperature settings:

Disable the compressor when sensing 30 +/- 3°F for 2 min.

continuously.

Enable compressor @ 55 +/- 5°F.

The fan should not be affected by the Frost Protection. It

should continue to function normally if freeze protection is

called for.

COOL Mode for SS, SM and XQ Models

When in the COOL mode, the control will turn on the

compressor when the indoor temperature is 1.5°F above the

set point and turn off the compressor when the ambient gets

below the set point by 1.5°F. The fan will run continuously.

MONEY SAVER Mode

When in MONEY SAVER mode, the system will be turned

on when the indoor temperature gets above the set point

by 0.75°F and turns off when the indoor temperature gets

below the set point by 0.75°F. The fan will turn on 5 seconds

before the compressor and turn off 5 seconds after the

compressor stops. If the compressor is delayed the fan

will continue to run while the compressor restarts. If the

rEfrIGErATION SEQUENCE Of OPErATION

A good understanding of the basic operation of the

refrigeration system is essential for the service technician.

Without this understanding, accurate troubleshooting of

refrigeration system problems will be more difﬁcult and time

consuming, if not (in some cases) entirely impossible. The

refrigeration system uses four basic principles (laws) in its

operation they are as follows:

The refrigerant leaves the condenser Coil through the liquid

line as a warm high pressure liquid. It next will pass through

the refrigerant drier (if so equipped). It is the function of the

driertotrapanymoisturepresentinthesystem,contaminants,

and large particulate matter.

The liquid refrigerant next enters the metering device. The

metering device is a capillary tube. The purpose of the

metering device is to “meter” (i.e. control or measure) the

quantity of refrigerant entering the evaporator coil.

1. “Heat always ﬂows from a warmer body to a cooler

body.”

2. “Heat must be added to or removed from a substance

before a change in state can occur”

In the case of the capillary tube this is accomplished (by

design) through size (and length) of device, and the pressure

difference present across the device.

3. “Flow is always from a higher pressure area to a lower

pressure area.”

Since the evaporator coil is under a lower pressure (due to

the suction created by the compressor) than the liquid line,

the liquid refrigerant leaves the metering device entering the

evaporator coil. As it enters the evaporator coil, the larger

area and lower pressure allows the refrigerant to expand

and lower its temperature (heat intensity). This expansion is

often referred to as “boiling”. Since the unit’s blower is moving

indoor air across the ﬁnned surface of the evaporator coil,

the expanding refrigerant absorbs some of that heat. This

results in a lowering of the indoor air temperature, hence the

“cooling” effect.

4. “The temperature at which a liquid or gas changes state

is dependent upon the pressure.”

The refrigeration cycle begins at the compressor. Starting

the compressor creates a low pressure in the suction line

which draws refrigerant gas (vapor) into the compressor.

The compressor then “compresses” this refrigerant, raising

its pressure and its (heat intensity) temperature.

The refrigerant leaves the compressor through the discharge

Line as a hot High pressure gas (vapor). The refrigerant

enters the condenser coil where it gives up some of its

heat. The condenser fan moving air across the coil’s ﬁnned

surface facilitates the transfer of heat from the refrigerant to

the relatively cooler outdoor air.

The expansion and absorbing of heat cause the liquid

refrigerant to evaporate (i.e. change to a gas). Once the

refrigerant has been evaporated (changed to a gas), it is

heated even further by the air that continues to ﬂow across

the evaporator coil.

When a sufﬁcient quantity of heat has been removed from

the refrigerant gas (vapor), the refrigerant will “condense”

(i.e. change to a liquid). Once the refrigerant has been

condensed (changed) to a liquid it is cooled even further by

the air that continues to ﬂow across the condenser coil.

The particular system design determines at exactly what

point (in the evaporator) the change of state (i.e. liquid to a

gas) takes place. In all cases, however, the refrigerant must

be totally evaporated (changed) to a gas before leaving the

evaporator coil.

The RAC design determines at exactly what point (in the

condenser) the change of state (i.e. gas to a liquid) takes

place. In all cases, however, the refrigerant must be

totally condensed (changed) to a Liquid before leaving the

condenser coil.

The low pressure (suction) created by the compressor

causes the refrigerant to leave the evaporator through the

suction line as a cool low pressure vapor. The refrigerant then

returns to the compressor, where the cycle is repeated.

Suction

Line

Discharge

Line

Condenser

Coil

Evaporator

Coil

Compressor

Metering

Device

Refrigerant Drier

Liquid

Line

Refrigerant

Strainer

SEALEd rEfrIGErATION SYSTEM rEPAIrS

IMPORTANT

ANY SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.

ALSO, ANY SEALED SYSTEM REPAIRS TO HEAT PUMP MODELS REQUIRE THE INSTALLATION OF A SUCTION LINE DRIER.

EQUIPMENT REQUIRED:

9. High Pressure Gauge - (0 - 400 lbs.)

1. Voltmeter

10. Low Pressure Gauge - (30 - 150 lbs.)

2. Ammeter

11. Vacuum Gauge - (0 - 1000 microns)

3. Ohmmeter

4. E.P.A. Approved Refrigerant Recovery System

EQUIPMENT MUST BE CAPABLE OF:

5. Vacuum Pump (capable of 200 microns or less

vacuum.)

1. Recovery CFC’s as low as 5%.

2. Evacuation from both the high side and low side of the

system simultaneously.

6. Acetylene Welder

7. Electronic Halogen Leak Detector (G.E. Type H-6 or

equivalent.)

3. Introducing refrigerant charge into high side of the

system.

8. Accurate refrigerant charge measuring device such

as:

4. Accurately weighing the refrigerant charge actually

introduced into the system.

a. Balance Scales - 1/2 oz. accuracy

b. Charging Board - 1/2 oz. accuracy

5. Facilities for ﬂowing nitrogen through refrigeration tubing

during all brazing processes.

Proper refrigerant charge is essential to proper unit

operation. Operating a unit with an improper refrigerant

charge will result in reduced performance (capacity) and/or

efﬁciency. Accordingly, the use of proper charging methods

during servicing will insure that the unit is functioning as

designed and that its compressor will not be damaged.

WARNING

RISK OF ELECTRIC SHOCK

Unplug and/or disconnect all electrical power

to the unit before performing inspections,

maintenances or service.

Failure to do so could result in electric shock,

serious injury or death.

Too much refrigerant (overcharge) in the system is just as bad

(if not worse) than not enough refrigerant (undercharge). They

both can be the source of certain compressor failures if they

remain uncorrected for any period of time. Quite often, other

problems (such as low air ﬂow across evaporator, etc.) are

misdiagnosed as refrigerant charge problems. The refrigerant

circuit diagnosis chart will assist you in properly diagnosing

these systems.

WARNING

HIGH PRESSURE HAZARD

SealedRefrigerationSystemcontainsrefrigerant

and oil under high pressure.

An overcharged unit will at times return liquid refrigerant

(slugging) back to the suction side of the compressor eventually

causing a mechanical failure within the compressor. This

mechanical failure can manifest itself as valve failure, bearing

failure, and/or other mechanical failure. The speciﬁc type of

failure will be inﬂuenced by the amount of liquid being returned,

and the length of time the slugging continues.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

refrigerant Charging

Not enough refrigerant (undercharge) on the other hand, will

cause the temperature of the suction gas to increase to the point

where it does not provide sufﬁcient cooling for the compressor

motor. When this occurs, the motor winding temperature will

increase causing the motor to overheat and possibly cycle open

the compressor overload protector. Continued overheating of

the motor windings and/or cycling of the overload will eventually

lead to compressor motor or overload failure.

NOTE: Because The RAC System Is A Sealed System,

Service Process Tubes Will Have To Be Installed. First

Install A Line Tap And Remove Refrigerant From System.

Make Necessary Sealed System Repairs And Vacuum

System. Crimp Process Tube Line And Solder End Shut.

Do Not Leave A Service Valve In The Sealed System.

Method Of Charging / repairs

The acceptable method for charging the RAC system is the

Weighed in Charge Method. The weighed in charge method is

applicable to all units. It is the preferred method to use, as it is

the most accurate.

The weighed in method should always be used whenever

a charge is removed from a unit such as for a leak repair,

compressor replacement, or when there is no refrigerant

charge left in the unit. To charge by this method, requires the

following steps:

1. Install a piercing valve to remove refrigerant from the

sealedsystem. (Piercing valve must be removed from the

system before recharging.)

2. Recover Refrigerant in accordance with EPA regulations.

WARNING

BURN HAZARD

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

Failure to follow these procedures could

result in moderate or serious injury.

3. Install a process tube to sealed system.

CAUTION

FREEZE HAZARD

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with liquid refrigerant.

Failure to follow these procedures could

result in minor to moderate injury.

4. Make necessary repairs to system.

5. Evacuate system to 200 microns or less.

6. Weigh in refrigerant with the property quantity of R-22

refrigerant.

7. Start unit, and verify performance.

WARNING

BURN HAZARD

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

Failure to follow these procedures could

result in moderate or serious injury.

8. Crimp the process tube and solder the end shut.

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or

installation.

HIGH PRESSURE HAZARD

SealedRefrigerationSystemcontainsrefrigerant

and oil under high pressure.

Extreme care must be used, if it becomes

necessary to work on equipment with power

applied.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to do so could result in serious injury or

death.

Failure to follow these procedures could

result in serious injury or death.

Undercharged refrigerant Systems

An undercharged system will result in poor performance

(low pressures, etc.) in both the heating and cooling

cycle.

A check of the amperage drawn by the compressor

motor should show a lower reading. (Check the Unit

Speciﬁcation.) After the unit has run 10 to 15 minutes,

check the gauge pressures. Gauges connected to system

with an undercharge will have low head pressures and

substantially low suction pressures.

Whenever you service a unit with an undercharge of

refrigerant, always suspect a leak. The leak must be

repaired before charging the unit.

To check for an undercharged system, turn the unit on,

allow the compressor to run long enough to establish

working pressures in the system (15 to 20 minutes).

During the cooling cycle you can listen carefully at the exit

of the metering device into the evaporator; an intermittent

hissing and gurgling sound indicates a low refrigerant

charge. Intermittent frosting and thawing of the evaporator

is another indication of a low charge, however, frosting

and thawing can also be caused by insufﬁcient air over

the evaporator.

Checks for an undercharged system can be made at

the compressor. If the compressor seems quieter than

normal, it is an indication of a low refrigerant charge.

of the evaporator will not be encountered because the

refrigerant will boil later if at all. Gauges connected to

system will usually have higher head pressure (depending

upon amount of over charge). Suction pressure should be

slightly higher.

Overcharged refrigerant Systems

Compressor amps will be near normal or higher.

Noncondensables can also cause these symptoms. To

conﬁrm, remove some of the charge, if conditions improve,

system may be overcharged. If conditions don’t improve,

Noncondensables are indicated.

Whenever an overcharged system is indicated, always

make sure that the problem is not caused by air ﬂow

problems. Improper air ﬂow over the evaporator coil may

indicate some of the same symptoms as an over charged

system.

An overcharge can cause the compressor to fail, since it

would be “slugged” with liquid refrigerant.

Thechargeforanysystemiscritical. Whenthecompressor

is noisy, suspect an overcharge, when you are sure that

the air quantity over the evaporator coil is correct. Icing

restricted refrigerant System

Troubleshooting a restricted refrigerant system can be

difﬁcult. The following procedures are the more common

problems and solutions to these problems. There are two

types of refrigerant restrictions: Partial restrictions and

complete restrictions.

at the metering device entrance to the evaporator. The

evaporator in a partial restriction could be partially frosted

or have an ice ball close to the entrance of the metering

device. Frost may continue on the suction line back to the

compressor.

A partial restriction allows some of the refrigerant to

circulate through the system.

Often a partial restriction of any type can be found by feel,

as there is a temperature difference from one side of the

restriction to the other.

With a complete restriction there is no circulation of

refrigerant in the system.

With a complete restriction, there will be no sound at the

metering device entrance. An amperage check of the

compressor with a partial restriction may show normal

current when compared to the unit speciﬁ cation. With a

complete restriction the current drawn may be considerably

less than normal, as the compressor is running in a deep

vacuum (no load.) Much of the area of the condenser will

be relatively cool since most or all of the liquid refrigerant

will be stored there.

Restricted refrigerant systems display the same symptoms

as a “low-charge condition.”

When the unit is shut off, the gauges may equalize very

slowly.

Gauges connected to a completely restricted system will

run in a deep vacuum. When the unit is shut off, the gauges

will not equalize at all.

The following conditions are based primarily on a system

in the cooling mode.

A quick check for either condition begins at the evaporator.

With a partial restriction, there may be gurgling sounds

hErMETIC COMPONENTS ChECK

WARNING

BURN HAZARD

WARNING

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

CUT/SEVER HAZARD

Be careful with the sharp edges and corners.

Wear protective clothing and gloves, etc.

Failure to follow these procedures could

result in moderate or serious injury.

Failure to do so could result in serious injury.

METErING dEvICE

Capillary Tube Systems

All units are equipped with capillary tube metering

devices.

3. Switch the unit to the heating mode and observe the

gauge readings after a few minutes running time. If

the system pressure is lower than normal, the heating

capillary is restricted.

Checking for restricted capillary tubes.

1. Connect pressure gauges to unit.

4. If the operating pressures are lower than normal in both

the heating and cooling mode, the cooling capillary is

restricted.

2. Start the unit in the cooling mode. If after a few minutes

of operation the pressures are normal, the check valve

and the cooling capillary are not restricted.

ChECK vALvE

Failure of the slide in the check valve to seat properly in

either mode of operation will cause ﬂooding of the cooling

coil. This is due to the refrigerant bypassing the heating or

cooling capillary tube and entering the liquid line.

A unique two-way check valve is used on the reverse cycle

heat pumps. It is pressure operated and used to direct the

ﬂow of refrigerant through a single ﬁlter drier and to the

proper capillary tube during either the heating or cooling

cycle.

COOLING MODE

In the cooling mode of operation, liquid refrigerant from

condenser (liquid line) enters the cooling check valve

forcing the heating check valve shut. The liquid refrigerant

is directed into the liquid dryer after which the refrigerant

is metered through cooling capillary tubes to evaporator.

(Note: liquid refrigerant will also be directed through the

heating capillary tubes in a continuous loop during the

cooling mode).

One-way Check Valve

(Heat Pump Models)

HEATING MODE

NOTE: The slide (check) inside the valve is made of teﬂon.

Should it become necessary to replace the check valve,

place a wet cloth around the valve to prevent overheating

during the brazing operation.

In the heating mode of operation, liquid refrigerant from

the indoor coil enters the heating check valve forcing the

cooling check valve shut. The liquid refrigerant is directed

into the liquid dryer after which the refrigerant is metered

through the heating capillary tubes to outdoor coils. (Note:

liquid refrigerant will also be directed through the cooling

capillary tubes in a continuous loop during the heating

mode).

CHECK VALVE OPERATION

In the cooling mode of operation, high pressure liquid enters

the check valve forcing the slide to close the opposite port

(liquid line) to the indoor coil. Refer to refrigerant ﬂow chart.

This directs the refrigerant through the ﬁlter drier and cooling

capillary tube to the indoor coil.

In the heating mode of operation, high pressure refrigerant

enters the check valve from the opposite direction, closing

the port (liquid line) to the outdoor coil. The ﬂow path of the

refrigerant is then through the ﬁlter drier and heating capillary

to the outdoor coil.

rEvErSING vALvE dESCrIPTION/OPErATION

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before servicing.

Failure to follow this warning could result in

serious injury or death.

The Reversing Valve controls the direction of refrigerant

“A”and“B”portsofthepilotvalve.Athirdcapillaryisacommon

return line from these ports to the suction tube on the main

valve body. Four-way reversing valves also have a capillary

tube from the compressor discharge tube to the pilot valve.

ﬂow to the indoor and outdoor coils. It consists of a

pressure-operated, main valve and a pilot valve actuated

by a solenoid plunger. The solenoid is energized during the

heating cycle only. The reversing valves used in the RAC

system is a 2-position, 4-way valve.

The piston assembly in the main valve can only be shifted

by the pressure differential between the high and low sides

of the system. The pilot section of the valve opens and

closes ports for the small capillary tubes to the main valve

to cause it to shift.

The single tube on one side of the main valve body is the

high-pressure inlet to the valve from the compressor. The

center tube on the opposite side is connected to the low

pressure (suction) side of the system. The other two are

connected to the indoor and outdoor coils. Small capillary

tubes connect each end of the main valve cylinder to the

NOTE: System operating pressures must be near

normal before valve can shift.

TESTING ThE COIL

pressure to build in the system. Then switch the system

from heating to cooling.

WARNING

ELECTRIC SHOCK HAZARD

Unplug and/or disconnect all electrical power

to the unit before performing inspections,

maintenances or service.

If the valve is stuck in the heating position, block the air

ﬂow through the indoor coil and allow discharge pressure

to build in the system. Then switch the system from

heating to cooling.

Failure to do so could result in electric shock,

serious injury or death.

Should the valve fail to shift in either position after

increasing the discharge pressure, replace the valve.

The solenoid coil is an electromagnetic type coil mounted

on the reversing valve and is energized during the

operation of the compressor in the heating cycle.

Dented or damaged valve body or capillary tubes can

prevent the main slide in the valve body from shifting.

1. Turn off high voltage electrical power to unit.

If you determing this is the problem, replace the reversing

valve.

2. Unplug line voltage lead from reversing valve coil.

3. Check for electrical continuity through the coil. If you

do not have continuity replace the coil.

After all of the previous inspections and checks have

been made and determined correct, then perform the

“Touch Test” on the reversing valve.

4. Check from each lead of coil to the copper liquid line

as it leaves the unit or the ground lug. There should

be no continuity between either of the coil leads

and ground; if there is, coil is grounded and must be

replaced.

5. If coil tests okay, reconnect the electrical leads.

6. Make sure coil has been assembled correctly.

NOTE: Do not start unit with solenoid coil removed from

valve, or do not remove coil after unit is in operation. This

will cause the coil to burn out.

ChECKING ThE rEvErSING vALvE

NOTE: You must have normal operating pressures before

the reversing valve can shift.

WARNING

HIGH PRESSURE HAZARD

Reversing Valve in Heating Mode

SealedRefrigerationSystemcontainsrefrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

Check the operation of the valve by starting the system

and switching the operation from “Cooling” to “Heating”

and then back to “Cooling”. Do not hammer on valve.

Occasionally, the reversing valve may stick in the heating

or cooling position or in the mid-position.

When sluggish or stuck in the mid-position, part of the

discharge gas from the compressor is directed back to the

suction side, resulting in excessively high suction pressure.

Should the valve fail to shift from coooling to heating, block

the air ﬂow through the outdoor coil and allow the discharge

Reversing Valve in Cooling Mode

Touch Test in heating/Cooling Cycle

6. Protectnewvalvebodyfromheatwhilebrazingwith plastic

heat sink (Thermo Trap) or wrap valve body with wet

rag.

WARNING

BURN HAZARD

Certain unit components operate at

temperatures hot enough to cause burns.

7. Fit all lines into new valve and braze lines into new

valve.

Proper safety procedures must be followed,

and proper protective clothing must be

worn.

WARNING

EXPLOSION HAZARD

Failure to follow these procedures could

result in minor to moderate injury.

The use of nitrogen requires a pressure

regulator. Follow all safety procedures and

wear protective safety clothing etc.

The only definite indications that the slide is in the mid-

position is if all three tubes on the suction side of the valve

are hot after a few minutes of running time.

Failure to follow proper safety procedures

could result in serious injury or death.

8. Pressurize sealed system with a combination of R-22

and nitrogen and check for leaks, using a suitable leak

detector. Recover refrigerant per EPA guidelines.

NOTE: A condition other than those illustrated above, and

on Page 31, indicate that the reversing valve is not shifting

properly. Both tubes shown as hot or cool must be the same

corresponding temperature.

9. Once the sealed system is leak free, install solenoid coil

on new valve and charge the sealed system by weighing

in the proper amount and type of refrigerant as shown

on rating plate. Crimp the process tubes and solder the

ends shut. Do not leave Schrader or piercing valves in

the sealed system.

Procedure for Changing reversing valve

WARNING

HIGH PRESSURE HAZARD

SealedRefrigerationSystemcontainsrefrigerant

and oil under high pressure.

NOTE: When brazing a reversing valve into the system, it is

of extreme importance that the temperature of the valve does

not exceed 250°F at any time.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Wrap the reversing valve with a large rag saturated with

water. “Re-wet” the rag and thoroughly cool the valve after

each brazing operation of the four joints involved.

Failure to follow these procedures could

result in serious injury or death.

The wet rag around the reversing valve will eliminate

conduction of heat to the valve body when brazing the line

connection.

NOTICE

FIRE HAZARD

The use of a torch requires extreme care and proper

judgment. Follow all safety recommended precautions

and protect surrounding areas with ﬁre proof materials.

Have a ﬁre extinguisher readily available. Failure to follow

this notice could result in moderate to serious property

damage.

1. Install Process Tubes. Recover refrigerant from sealed

system. PROPER HANDLING OF RECOVERED

REFRIGERANT ACCORDING TO EPA REGULATIONS

IS REQUIRED.

2. Remove solenoid coil from reversing valve. If coil is to

be reused, protect from heat while changing valve.

3. Unbraze all lines from reversing valve.

4. Clean all excess braze from all tubing so that they will

slip into ﬁttings on new valve.

5. Remove solenoid coil from new valve.

COMPrESSOr ChECKS

External Overload

WARNING

ELECTRIC SHOCK HAZARD

The compressor is equipped with an external overload

which senses both motor amperage and winding tem-

perature. High motor temperature or amperage heats the

overload causing it to open, breaking the common circuit

within the compressor.

Turn off electric power before service or

installation. Extreme care must be used, if it

becomes necessary to work on equipment with

power applied.

Heat generated within the compressor shell, usually due

to recycling of the motor, is slow to dissipate. It may take

anywhere from a few minutes to several hours for the

overload to reset.

Failure to do so could result in serious injury or

death.

Locked rotor voltage (L.r.v.) Test

Locked rotor voltage (L.R.V.) is the actual voltage available

at the compressor under a stalled condition.

Checking the External Overload

Single Phase Connections

Disconnect power from unit. Using a voltmeter, attach one

lead of the meter to the run “R” terminal on the compressor

and the other lead to the common “C” terminal of the com-

pressor. Restore power to unit.

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or

installation. Extreme care must be used, if it

becomes necessary to work on equipment

with power applied.

determine L.r.v.

Start the compressor with the volt meter attached; then stop

the unit. Attempt to restart the compressor within a couple

of seconds and immediately read the voltage on the meter.

The compressor under these conditions will not start and will

usually kick out on overload within a few seconds since the

pressures in the system will not have had time to equalize.

Voltage should be at or above minimum voltage of 197 VAC,

as speciﬁed on the rating plate. If less than minimum, check

for cause of inadequate power supply; i.e., incorrect wire

size, loose electrical connections, etc.

Failure to do so could result in serious injury or

death.

WARNING

BURN HAZARD

Certain unit components operate at

temperatures hot enough to cause burns.

Proper safety procedures must be followed,

and proper protective clothing must be

worn.

Amperage (L.r.A.) Test

The running amperage of the compressor is the most impor-

tant of these readings. A running amperage higher than that

indicated in the performance data indicates that a problem

exists mechanically or electrically.

Failure to follow this warning could result

in moderate to serious injury.

With power off, remove the leads from compressor termi-

nals. If the compressor is hot, allow the overload to cool

before starting check. Using an ohmmeter, test continu-

ity across the terminals of the external overload. If you

do not have continuity; this indicates that the overload is

open and must be replaced.

Single Phase Running and L.R.A. Test

NOTE: Consult the speciﬁcation and performance section

for running amperage. The L.R.A. can also be found on the

rating plate.

Select the proper amperage scale and clamp the meter

probe around the wire to the “C” terminal of the compressor.

Turn on the unit and read the running amperage on the me-

ter. If the compressor does not start, the reading will indicate

the locked rotor amperage (L.R.A.).

Single Phase resistance Test

Many compressor failures are caused by the following

conditions:

WARNING

ELECTRIC SHOCK HAZARD

1. Improper air ﬂow over the evaporator.

Turn off electric power before service or

2. Overcharged refrigerant system causing liquid to be

returned to the compressor.

installation. Extreme care must be used, if it

becomes necessary to work on equipment

with power applied.

3. Restricted refrigerant system.

4. Lack of lubrication.

Failure to do so could result in serious injury or

death.

Remove the leads from the compressor terminals and set

the ohmmeter on the lowest scale (R x 1).

5. Liquid refrigerant returning to compressor causing oil

to be washed out of bearings.

Touch the leads of the ohmmeter from terminals common

to start (“C” to “S”). Next, touch the leads of the ohmmeter

from terminals common to run (“C” to “R”).

Noncondensables such as air and moisture in

the system. Moisture is extremely destructive to a

refrigerant system.

Add values “C” to “S” and “C” to “R” together and

check resistance from start to run terminals (“S” to “R”).

Resistance “S” to “R” should equal the total of “C” to “S”

and “C” to “R.”

7. Capacitor test (see page 21).

CHECKING COMPRESSOR EFFICIENCY

In a single phase PSC compressor motor, the highest

value will be from the start to the run connections (“S” to

“R”). The next highest resistance is from the start to the

common connections (“S” to “C”). The lowest resistance

is from the run to common. (“C” to “R”) Before replacing a

compressor, check to be sure it is defective.

The reason for compressor inefﬁciency is normally due

to broken or damaged suction and/or discharge valves,

reducing the ability of the compressor to pump refrigerant

gas.

This condition can be checked as follows:

1. Install a piercing valve on the suction and discharge or

liquid process tube.

GROUND TEST

Use an ohmmeter set on its highest scale. Touch one

lead to the compressor body (clean point of contact as

a good connection is a must) and the other probe in turn

to each compressor terminal. If a reading is obtained the

compressor is grounded and must be replaced.

2. Attach gauges to the high and low sides of the system.

3. Start the system and run a “cooling or heating perfor-

mance test.” If test shows:

Check the complete electrical system to the compressor

and compressor internal electrical system, check to be

certain that compressor is not out on internal overload.

A. Below normal high side pressure

B. Above normal low side pressure

C. Low temperature difference across coil

Complete evaluation of the system must be made

whenever you suspect the compressor is defective. If

the compressor has been operating for sometime, a

careful examination must be made to determine why the

compressor failed.

The compressor valves are faulty - replace the

compressor.

COMPrESSOr rEPLACEMENT

recommended procedureforcompressor

3. After all refrigerant has been recovered, disconnect

suction and discharge lines from the compressor and

remove compressor. Be certain to have both suction

and discharge process tubes open to atmosphere.

replacement

WARNING

4. Carefully pour a small amount of oil from the suction

RISK OF ELECTRIC SHOCK

Unplug and/or disconnect all electrical power

to the unit before performing inspections,

maintenances or service.

stub of the defective compressor into a clean

container.

5. Using an acid test kit (one shot or conventional kit), test

the oil for acid content according to the instructions

with the kit.

Failure to do so could result in electric shock,

serious injury or death.

6. If any evidence of a burnout is found, no matter how

slight, the system will need to be cleaned up following

proper procedures.

1. Be certain to perform all necessary electrical and

refrigeration tests to be sure the compressor is

actually defective before replacing.

7. Install the replacement compressor.

WARNING

HIGH PRESSURE HAZARD

SealedRefrigerationSystemcontainsrefrigerant

and oil under high pressure.

EXPLOSION HAZARD

The use of nitrogen requires a pressure

regulator. Follow all safety procedures and

wear protective safety clothing etc.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow proper safety procedures

result in serious injury or death.

Failure to follow these procedures could

result in serious injury or death.

8. Pressurize with a combination of R-22 and nitrogen

and leak test all connections with an electronic or

Halide leak detector. Recover refrigerant and repair

any leaks found.

2. Recover all refrigerant from the system though

the process tubes. PROPER HANDLING OF

RECOVERED REFRIGERANT ACCORDING TO

EPA REGULATIONS IS REQUIRED. Do not use

gauge manifold for this purpose if there has been

a burnout. You will contaminate your manifold and

hoses. Use a Schrader valve adapter and copper

tubing for burnout failures.

Repeat Step 8 to insure no more leaks are present.

9. Evacuate the system with a good vacuum pump capable

of a ﬁnal vacuum of 300 microns or less. The system

should be evacuated through both liquid line and suction

line gauge ports. While the unit is being evacuated, seal

all openings on the defective compressor. Compressor

manufacturers will void warranties on units received not

properly sealed. Do not distort the manufacturers tube

connections.

WARNING

HIGH TEMPERATURES

Extreme care, proper judgment and all safety

procedures must be followed when testing,

troubleshooting, handling or working around

unit while in operation with high temperature

components. Wear protective safety aids

such as: gloves, clothing etc.

CAUTION

FREEZE HAZARD

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with liquid refrigerant.

Failure to do so could result in serious burn

injury.

Failure to follow these procedures could

result in minor to moderate injury.

NOTICE

FIRE HAZARD

10. Recharge the system with the correct amount of

refrigerant. The proper refrigerant charge will be

found on the unit rating plate. The use of an accurate

measuring device, such as a charging cylinder,

The use of a torch requires extreme care and proper

judgment. Follow all safety recommended precautions

and protect surrounding areas with ﬁre proof materials.

Have a ﬁre extinguisher readily available. Failure to follow

this notice could result in moderate to serious property

damage.

electronic scales or similar device is necessary.

SPECIAL PROCEDURE IN THE CASE OF MOTOR

COMPRESSOR BURNOUT

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or

installation.

Failure to do so may result in personal injury,

or death.

WARNING

HIGH PRESSURE HAZARD

SealedRefrigerationSystemcontainsrefrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

EXPLOSION HAZARD

The use of nitrogen requires a pressure

regulator. Follow all safety procedures and

wear protective safety clothing etc.

Failure to follow proper safety procedures

result in serious injury or death.

Recover all refrigerant and oil from the system.

Remove compressor, capillary tube and ﬁlter drier

from the system.

Flush evaporator condenser and all connecting

tubing with dry nitrogen or equivalent. Use approved

ﬂushing agent to remove all contamination from

system. Inspect suction and discharge line for

carbon deposits. Remove and clean if necessary.

Ensure all acid is neutralized.

4. Reassemble the system, including new drier strainer

and capillary tube.

5. Proceed with step 8-10 on previous page.

ROTARY COMPRESSOR SPECIAL TROUBLESHOOTING

AND SERVICE

Basically, troubleshooting and servicing rotary compres-

sors is the same as on the reciprocating compressor with

only one main exception:

NEVER, under any circumstances, charge a rotary com-

pressor through the LOW side. Doing so would cause

permanent damage to the new compressor.

rOUTINE MAINTENANCE

NOTICE

WARNING

Units are to be inspected and serviced by qualiﬁed service

personnel only. Use proper protection on surrounding

property. Failure to follow this notice could result in

moderate or serious property damage.

ELECTRIC SHOCK HAZARD

Turn off electric power before inspections,

maintenances, or service.

Extreme care must be used, if it becomes

necessary to work on equipment with power

applied.

Failure to do so could result in serious injury

or death.

AIR FILTER

Clean the unit air intake ﬁlter at least every 300 to 350 hours of operation. Clean the ﬁlters with a mild detergent in

warm water and allow to dry thoroughly before reinstalling.

COILS AND BASE PAN

WARNING

NOTICE

EXCESSIVE WEIGHT HAZARD

Use two people to lift or carry the unit, and wear

proper protective clothing.

Do not use a caustic coil cleaning agent on coils or base

pan. Use a biodegradable cleaning agent and degreaser,

to prevent damage to the coil and/or base pan.

Failure to do so may result in personal injury.

WARNING

CUT/SEVER HAZARD

Be careful with the sharp edges and corners.

Wear protective clothing and gloves, etc.

Failure to do so could result in serious injury.

The indoor coil (evaporator coil), the outdoor coil (condenser coil) and base pan should be inspected periodically

(yearly or bi-yearly) and cleaned of all debris (lint, dirt, leaves, paper, etc.). Clean the coils and base pan with a soft

brush and compressed air or vacuum. If using a pressure washer, be careful not to bend the aluminium ﬁn pack. Use

a sweeping up and down motion in the direction of the vertical aluminum ﬁn pack when pressure cleaning coils. Cover

all electrical components to protect them from water or spray. Allow the unit to dry thoroughly before reinstalling it in

the sleeve.

BLOWER WHEEL / HOUSING / CONDENSER FAN / SHROUD

Inspect the indoor blower housing, evaporator blade, condenser fan blade and condenser shroud periodically (yearly or

bi-yearly) and clean of all debris (lint, dirt, mold, fungus, etc.). Clean the blower housing area and blower wheel with an

antibacterial / antifungal cleaner. Use a biodegradable cleaning agent and degreaser on condenser fan and condenser

shroud. Use warm or cold water when rinsing these items. Allow all items to dry thoroughly before reinstalling them.

ELECTRONIC / ELECTRICAL / MECHANICAL

Periodically (at least yearly or bi-yearly): inspect all control components: electronic, electrical and mechanical, as well

as the power supply. Use proper testing instruments (voltmeter, ohmmeter, ammeter, wattmeter, etc.) to perform elec-

trical tests. Use an air conditioning or refrigeration thermometer to check room, outdoor and coil operating tempera-

tures. Use a sling psychrometer to measure wet bulb temperatures indoors and outdoors.

Inspect the surrounding area (inside and outside) to ensure that the unit’s clearances have not been compromised or

altered.

rOUTINE MAINTENANCE (Continued)

NOTICE

Do not drill holes in the bottom of the drain pan or the

underside of the unit. Not following this notice could

result in damage to the unit or condensate water leaking

inappropriately which could cause water damage to

surrounding property.

SLEEVE / DRAIN

Inspect the sleeve and drain system periodically (at least yearly or bi-yearly) and clean of all obstructions and

debris. Clean both areas with an antibacterial and antifungal cleaner. Rinse both items thoroughly with water and

ensure that the drain outlets are operating correctly. Check the sealant around the sleeve and reseal areas as

needed.

FRONT COVER

Clean the front cover when needed. Use a mild detergent. Wash and rinse with warm water. Allow it to dry

thoroughly before reinstalling it in the chassis.

Fresh Air

Compressor

Liquid Filter Driers

Capillary Tube

Reversing Valve

Condenser Coil

(some models)

Discharge Air

Front Cover

Outdoor Grille

System Switches

Evaporator Coil

Sleeve

Return Air Grille/Filter

Blower Wheel

Blower Motor

Condenser Fan Blade

Basepan

COOLING ONLY rOOM AIr CONdITIONErS: TrOUBLEShOOTING TIPS

Problem

Possible Cause

Low voltage

Action

Check voltage at compressor. 115V & 230V

units will operate at 10% voltage variance

Set t-stat to coldest position. Test t-stat & re-

place if inoperative

T-stat not set cold enough or

inoperative

Compressor hums but cuts off on

overload

Hard start compressor. Direct test compressor.

If compressor starts, add starting components

Open or shorted compressor

windings

Compressor

does not run

Check for continuity & resistance

Open overload

Test overload protector & replace if inoperative

Test capacitor & replace if inoperative

Test for continuity in all positions. Replace if

inoperative

Open capacitor

Inoperative system switch

Refer to appropriate wiring diagrams to check

wiring

Broken, loose or incorrect wiring

Problem

Possible Cause

Inoperative system switch

Broken, loose or incorrect wiring

Open capacitor

Action

Test switch & replace if inoperative

Refer to applicable wiring diagram

Test capacitor & replace if inoperative

Test switch & replace if inoperative

Test fan motor & replace if inoperative (be sure

internal overload has had time to reset)

Fan motor

does not run

Fan speed switch open

Inoperative fan motor

Problem

Possible Cause

Action

Undersized unit

Refer to industry standard sizing chart

Set to coldest position. Test t-stat & replace if

necessary

T-stat open or inoperative

Dirty ﬁlter

Clean as recommended in Owner’s Manual

Use pressure wash or biodegradable cleaning

agent to clean

Dirty or restricted condenser or

evaporator coil

Does not cool or

only cools slightly

Poor air circulation

Adjust discharge louvers. Use high fan speed

Close doors. Instruct customer on use of this

feature

Fresh air or exhaust air door open

on applicable models

Low capacity - undercharge

Check for leak & make repair

Check amperage draw against nameplate. If

not conclusive, make pressure test

Compressor not pumping properly

COOLING ONLY rOOM AIr CONdITIONErS: TrOUBLEShOOTING TIPS

Problem

Possible Cause

Action

Replace fuse, reset breaker. If repeats, check

fuse or breaker size. Check for shorts in unit

wiring & components

Fuse blown or circuit tripped

Power cord not plugged in

Plug it in

System switch in “OFF” position

Set switch correctly

Unit does not run

Inoperative system switch or open

control board

Test for continuity

Loose or disconnected wiring at

Check wiring & connections. Reconnect per

wiring diagram

switch, control board or other com-

ponents

Problem

Possible Cause

Action

Dirty ﬁlter

Clean as recommended in Owner’s Manual

Check for dirty or obstructed coil. Use

pressure wash or biodegradable cleaning

agent to clean

Restricted airﬂow

Inoperative t-stat or thermistors

Short of refrigerant

Test for continuity

Evaporator coil

freezes up

De-ice coil & check for leak

Inoperative fan motor

Test fan motor & replace if inoperative

De-ice coil. Check temp. differential (delta T)

across coil. Touch test coil return bends for

same temp. Test for low running current

Partially restricted capillary tube

Problem

Possible Cause

Action

Unit undersized. Test cooling performance &

replace with larger unit if needed

Check for partially iced coil & check

temperature split across coil

Excessive heat load

Restriction in line

Refrigerant leak

Check for oil at silver soldered connections.

Check for partially iced coil. Check split across

coil. Check for low running amperage

Check operation of t-stat. Replace if contacts

remain closed.

Compressor runs

continually & does

not cycle off

T-stat contacts stuck

T-stat incorrectly wired

Thermistor shorted

Refer to appropriate wiring diagram

Replace thermistor or electronic control board

Problem

Possible Cause

Action

Disconnect power to unit. Remove cover

of t-stat & check if contacts are stuck. If so,

replace t-stat

T-stat contacts stuck

Turn to higher temp. setting to see if unit

cycles off

T-stat set at coldest point

Incorrect wiring

T-stat does not

turn unit off

Refer to appropriate wiring diagrams

Refer to industry standard sizing chart

Replace thermistor or electronic control board

Unit undersized for area to be

cooled

Defective thermistor

COOLING ONLY rOOM AIr CONdITIONErS: TrOUBLEShOOTING TIPS

Problem

Possible Cause

Overload inoperative. Opens too

soon

Action

Check operation of unit. Replace overload if

system operation is satisfactory

Allow a minimum of 2 minutes to allow

pressures to equalize before attempting to

restart. Instruct customer of waiting period

Check voltage with unit operating. Check for

other appliances on circuit. Air conditioner

should be in separate circuit for proper voltage

& fused separately

Compressor restarted before

system pressures equalized

Compressor runs

for short periods

only. Cycles on

overload

Low or ﬂuctuating voltage

Incorrect wiring

Refer to appropriate wiring diagram

Check by substituting a known good capacitor

of correct rating

Shorted or incorrect capacitor

Restricted or low air ﬂow through

Check for proper fan speed or blocked

coils

condenser coil or evaporator coil

Check for kinked discharge line or restricted

condenser. Check amperage

Compressor running abnormally

hot

Problem

Possible Cause

Action

Place jumper across t-stat terminals to check if

unit operates. If unit operates, replace t-stat.

Check as above

Loss of charge in t-stat bulb

T-stat does not

turn unit on

Loose or broken parts in t-stat

Incorrect wiring

Refer to appropriate wiring diagram

Replace thermistor or electronic control board

Defective thermistor

Problem

Possible Cause

Poorly installed

Action

Refer to Installation Manual for proper

installation

Fan blade striking chassis

Reposition - adjust motor mount

Check that compressor grommets have not

deteriorated. Check that compressor mounting

parts are not missing

Noisy operation

Compressor vibrating

Improperly mounted or loose

cabinet parts

Check assembly & parts for looseness,

rubbing & rattling

Problem

Possible Cause

Action

Evaporator drain pan overﬂowing

Clean obstructed drain trough

Evaporator drain pan broken or cracked.

Reseal or replace. No chassis gasket installed.

Install chassis gasket

Condensation forming on base pan

Poor installation resulting in rain

entering the room

Check installation instructions. Reseal as

required

Water leaks into

the room

Dirty evaporator coil. Use pressure wash

or biodegradable cleaning agent to clean.

Environmental phenomena: point supply

louvers upward

Condensation on discharge grille

louvers

Chassis gasket not installed

Downward slope of unit is too

steep inward

Install gasket, per Installation manual

Refer to installation manual for proper

installation

COOLING ONLY rOOM AIr CONdITIONErS: TrOUBLEShOOTING TIPS

Problem

Possible Cause

Sublimation:

Action

Ensure that foam gaskets are installed in

between window panes & in between the

unit & the sleeve. Also, ensure that fresh

air/exhaust vents (on applicable models) are in

the closed position & are in tact

When unconditioned saturated,

outside air mixes with conditioned

air, condensation forms on the

cooler surfaces

Water “spitting”

into room

Follow installation instructions to ensure that

downward pitch of installed unit is no less than

1/4” & no more than 3/8”

Downward pitch of installation is

too steep towards back of unit

Clean & advise customer of periodic cleaning

& maintenance needs of entire unit

Restricted coil or dirty ﬁlter

Problem

Possible Cause

Insufﬁcient air circulation thru area

to be air conditioned

Action

Adjust louvers for best possible air circulation

Operate in “MoneySaver” position

Advise customer

Excessive

moisture

Oversized unit

Inadequate vapor barrier in building

structure, particularly ﬂoors

Problem

Possible Cause

Defective thermistor

Action

Replace thermistor or electronic control board

Replace t-stat

T-stat differential too narrow

Plenum gasket not sealing,

allowing discharge air to short

cycle t-stat

T-stat or

thermistor

short cycles

Check gasket. Reposition or replace as

needed

Clean & advise customer of periodic cleaning

& maintenance needs of entire unit

Restricted coil or dirty ﬁlter

Problem

Possible Cause

Heat anticipator (resistor) wire

disconnected at t-stat or system

switch

Action

Refer to appropriate wiring diagram

Disconnect plus from outlet. Remove resistor

from bracket. Insert plug & depress “COOL”

& “FAN AUTOMATIC” buttons. Place t-stat to

warmest setting. Feel resistor for temperature.

If no heat, replace resistor

Prolonged off

cycles (automatic

operation)

Heat anticipator (resistor) shorted or

open

Partial loss of charge in t-stat bulb

causing a wide differential

Replace t-stat

Defective thermistor

Replace thermistor or electronic control board

Problem

Possible Cause

Evaporator drain pan cracked or

obstructed

Action

Repair, clean or replace as required

Detach shroud from pan & coil. Clean &

remove old sealer. Reseal, reinstall & check

Use pressure wash or biodegradable cleaning

agent to clean

Water in compressor area

Obstructed condenser coil

Outside water

leaks

Fan blade/slinger ring improperly

positioned

Adjust fan blade to 1/2” of condenser coil ﬁn

pack

hEAT / COOL ONLY rOOM AIr CONdITIONErS: TrOUBLEShOOTING TIPS

Problem

Possible Cause

Action

Disconnect power to unit. Remove resistor from

t-stat bulb block. Plus in unit & allow to operate.

Feel resistor for heat. If not heat, replace resistor

Heat anticipator (resistor) shorted (on applicable

models)

Room temperature

uneven

(Heating cycle)

Wide differential - partial loss of t-stat bulb charge Replace t-stat & check

Refer to appropriate wiring diagram. Resistor is

Incorrect wiring

energized during "ON" cycle of compressor or

fan.

Problem

Possible Cause

Action

Incorrect wiring

Refer to appropriate wiring diagram

Defrost control timer motor not advancing

(applicable models)

Check for voltage at "TM" & "TM1" on timer. If no

voltage, replace control

If outside coil temperature is 25F or below, &

preselected time limit has elapsed, replace

defrost control

Defrost control out of calibration (applicable

models)

Unit will not defrost

If contacts remain closed between terminals "2"

& "3" of the defrost control after preselected time

interval has passed, replace control

Defrost control contacts stuck

Defrost control bulb removed from or not making Reinstall & be assured that good bulb to coil

good coil contact contact is made

Problem

Possible Cause

Action

Check if operating properly. Instruct customer on

proper use of control

Exhaust or fresh air door open

Dirty ﬁlter

Clean as recommended in Owner's Manual

Check heat rise across coil. If unit operates

efﬁciently, check if insulation can be added

to attic or walls. If insulation is adequate,

recommend additional unit or larger one

Unit undersized

Does not heat

adequately

T-stat should close at 38°F. Check continuity of

control. If temperature is below 38°F, replace

control

Outdoor t-stat open (applicable models)

Heater hi-limit control cycling on & off

Check for adequate fan air across heater. Check

control for open at 160°F & close at 150°F

Shorted supplementary heater

Incorrect wiring

Ohmmeter check, approx. 32-35 ohms

Check applicable wiring diagram

HEAT / COOL ROOM AIR CONDITIONERS: TROUBLE SHOOTING TIPS

Problem

Possible Cause

Incorrect wiring

Action

Refer to applicable wiring diagram

Check for continuity of coil

Defective solenoid coil

Reversing valve fails to shift

Inoperative system switch

Possible Cause

Block condenser coil & switch unit to cooling.

Allow pressure to build up in system, then

switch to heating. If valve fails to shift, replace

valve.

Unit cools when

heat is called for

Check for continuity of system switch

Problem

Action

Heating capillary tube partially

restricted

Check for partially starved outer coil. Replace

heating capillary tube

Switch unit several times from heating to

cooling. Check temperature rise across

coil. Refer to speciﬁcation sheet for correct

temperature rise

Cooling adequate,

but heating

Check valve leaking internally

insufﬁcient

Deenergize solenoid coil, raise head pressure,

energize solenoid to break loose. If valve fails

to make complete shift, replace valve.

Reversing valve failing to shift

completely; bypassing hot gas

TROUBLESHOOTING CHART — HEATPUMP

REFRIGERANT SYSTEM DIAGNOSIS - COOLING CYCLE

LOW SUCTION PRESSURE

HIGH SUCTION PRESSURE

LOW HEAD PRESSURE

HIGH HEAD PRESSURE

Low Load Conditions

High Load Conditions

Low Load Conditions

High Load Conditions

Low Air Flow Across

Indoor Coil

High Air Flow Across

Indoor Coil

Refrigerant System

Restriction

Low Air Flow Across

Outdoor Coil

Refrigerant System

Restriction

Reversing Valve not

Fully Seated

Reversing Valve not

Fully Seated

Overcharged

Undercharged

Overcharged

Undercharged

in System

Noncondensables (air)

Moisture in System

Defective Compressor

TROUBLESHOOTING CHART — HEATPUMP

REFRIGERANT SYSTEM DIAGNOSIS - HEATING CYCLE

HIGH SUCTION PRESSURE

HIGH HEAD PRESSURE

LOW SUCTION PRESSURE

LOW HEAD PRESSURE

Low Airﬂow

Across Outdoor Coil

Outdoor Ambient Too High

for Operation in Heating

Refrigerant System

Restriction

Outdoor Ambient Too High

For Operation In Heating

Refrigerant System

Restriction

Reversing Valve not

Fully Seated

Reversing Valve not

Fully Seated

Low Airﬂow Across

Indoor Coil

Undercharged

Overcharged

Undercharged

Overcharged

Noncondensables (air)

in System

Moisture in System

Defective Compressor

ELECTRICAL TROUBLESHOOTING CHART — HEAT PUMP

HEAT PUMP

SYSTEM COOLS WHEN

HEATING IS DESIRED.

Is the Selector Switch

Is Line Voltage

Set for Heat?

Present at the Solenoid

YES

Is the Solenoid Coil Good?

Replace the Solenoid Coil

YES

Reversing Valve Stuck

Replace the Reversing Valve

TrOUBLEShOOTING TOUCh TEST ChArT: TO SErvICE rEvErSING vALvES

NORMAL FUNCTION OF VALVE

NOTES:

VALVE

OPERATING

CONDITION

* TEMPERATURE OF VALVE BODY

** WARMER THAN VALVE BODY

POSSIBLE CAUSES

CORRECTIONS

Cool

as (2)

Hot

as (1)

Hot

Cool

*TVB

TVB

Normal Cooling

Normal Heating

Hot

as (1)

Cool

as (2)

Hot

Cool

*TVB

TVB

MALFUNCTION OF VALVE

No voltage to coil.

Repair electrical circuit.

Check Electrical circuit and coil

Check refrigeration charge

Defective coil.

Replace coil.

Low charge.

Repair leak, recharge system.

Recheck system.

Pressure differential too high.

Deenergize solenoid, raise head pressure,

reenergize solenoid to break dirt loose.

If unsuccessful, remove valve, wash

out. Check on air before installing. If no

movement, replace valve, add strainer to

discharge tube, mount valve horizontally.

Valve will not

shift from cool

to heat.

Cool,

as (2)

Hot,

as (1)

Hot

Cool

*TVB

Hot

Pilot valve okay. Dirt in one bleeder hole.

Stop unit. After pressures equalize, restart

with solenoid energized. If valve shifts,

reattempt with compressor running. If still

no shift, replace valve.

Piston cup leak

Cool,

as (2)

Hot,

as (1)

Raise head pressure, operate solenoid to

free. If still no shift, replace valve.

Hot

Cool

*TVB

Hot

*TVB

Hot

Clogged pilot tubes.

Raise head pressure, operate solenoid

to free

partially clogged port. If still no shift,

replace

valve.

Valve will not

shift from cool

to heat.

Cool,

as (2)

Hot,

as (1)

Both ports of pilot open. (Back seat port

did not close).

Cool,

as (2)

Hot,

as (1)

Warm

Hot

Cool

*TVB

Warm

Hot

Defective Compressor.

Replace compressor

Not enough pressure differential at start

of stroke or not enough ﬂ ow to maintain and charge. Raise head pressure. If no

Check unit for correct operating pressures

Warm

Hot

pressure differential.

shift, use valve with smaller port.

Body damage.

Replace valve

Starts to shift

but does not

complete

Raise head pressure, operate solenoid. If

no shift, use valve with smaller ports.

Hot

Warm

Hot

Warm

Hot

Both ports of pilot open.

Body damage.

*TVB

Replace valve

Valve hung up at mid-stroke. Pumping

volume of compressor not sufﬁ cient to

maintain reversal.

reversal.

Raise head pressure, operate solenoid. If

no shift, use valve with smaller ports.

Raise head pressure, operate solenoid.

Hot

Both ports of pilot open.

If no

shift, replace valve.

Hot,

as (1)

Cool,

as (2)

Operate valve several times, then recheck.

If excessive leak, replace valve.

Apparent

leap in heat-

ing.

Hot

Cool

*TVB

**WVB

*TVB

**WVB

*TVB

Piston needle on end of slide leaking.

Pilot needle and piston needle leaking.

Pressure differential too high.

Clogged pilot tube.

Hot,

as (1)

Cool,

as (2)

Operate valve several times, then recheck.

If excessive leak, replace valve.

Hot,

as (1)

Cool,

as (2)

Stop unit. Will reverse during equalization

period. Recheck system

Raise head pressure, operate solenoid to

free dirt. If still no shift, replace valve.

Raise head pressure, operate solenoid.

Remove valve and wash out. Check on air

before reinstalling, if no movement, replace

valve. Add strainer to discharge tube.

Mount valve horizontally.

Hot,

as (1)

Cool,

as (2)

Hot

Cool

Hot

*TVB

Dirt in bleeder hole.

Piston cup leak.

Will not shift

from heat to

cool.

Stop unit. After pressures equalize, restart

with solenoid deenergized. If valve shifts,

reattempt with compressor running. If it

still will not reverse while running, replace

the valve.

Hot,

as (1)

Cool,

as (2)

Hot,

as (1)

Cool,

as (2)

Hot

Cool

Hot

Defective pilot.

Replace valve.

Warm,

as (1)

Cool,

as (2)

Warm

*TVB

Defective compressor.

Replace compressor

ELECTrONIC CONTrOL

COOL ONLY MOdELS:

XQ05L10A-C XQ06L10A-C XQ08L10A-B,A-E

XQ10L10A-C XQ12L10A-B,A-C

ELECTrONIC CONTrOL

COOL ONLY MOdELS:

SS08L10-E,-f,-G SS10L10-d,-E SS12L10-E,-f

SS14L10-d,-E

SS12L30-E,-f SS16L30-d,-E

SM18L30A-d,A-E SM21L30-E,-f SM24L30-C,-d

ELECTrOMEChANICAL CONTrOL

COOL ONLY MOdELS:

KS12L10-E,-f KS15L10-C,-d

KM18L30-C,-d KM24L30-C,-d

ELECTrOMEChANICAL CONTrOL

COOL ONLY MOdELS:

SL28L30-d,-E SL36L30A-d,A-E

ELECTrOMEChANICAL CONTrOL

COOL WITh ELECTrIC hEAT MOdEL:

EQ08L11A-B,A-E

ELECTrOMEChANICAL CONTrOL

COOL WITh ELECTrIC hEAT MOdELS:

ES12L33-d,-E ES16L33-C,-d

EM18L34-C EM24L34-B

ELECTrOMEChANICAL CONTrOL

COOL WITh ELECTrIC hEAT MOdELS:

EL36L35A-d,A-E

ELECTrOMEChANICAL CONTrOL

hEAT PUMP ONLY MOdELS:

YS09L10-f,-G

ELECTrOMEChANICAL CONTrOL

hEAT PUMP WITh ELECTrIC hEAT MOdELS:

YS13L33-d,-E YM18L34-d,-E

ELECTrOMEChANICAL CONTrOL

hEAT PUMP WITh ELECTrIC hEAT MOdELS:

YL24L35-E,-f

INSTRUCTIONS FOR USING COOLING LOAD ESTIMATE

FORM FOR ROOM AIR CONDITIONERS

(AHAM PUB. NO. RAC-1)

A. This cooling load estimate form is suitable for estimating the cooling load for comfort air conditioning installations

which do not require speciﬁc conditions of inside temperature and humidity.

B. The form is based on an outside design temperature of 95°F dry bulb and 75°F wet bulb. It can be used for areas

in the continental United States having other outside design temperatures by applying a correction factor for the

particular locality as determined from the map.

C. The form includes “day” factors for calculating cooling loads in rooms where daytime comfort is desired (such as

living rooms, ofﬁces, etc.)

D. The numbers of the following paragraphs refer to the corresponding numbered item on the form:

1. Multiply the square feet of window area for each exposure by the applicable factor. The window area is the

area of the wall opening in which the window is installed. For windows shaded by inside shades or venetian

blinds, use the factor for “Inside Shades.” For windows shaded by outside awnings or by both outside aw-

nings and inside shades (or venetian blinds), use the factor for “Outside Awnings.” “Single Glass” includes

all types of single thickness windows, and “Double Glass” includes sealed airspace types, storm windows,

and glass block. Only one number should be entered in the right hand column for Item 1, and this number

should represent only the exposure with the largest load.

2. Multiply the total square feet of all windows in the room by the applicable factor.

3a. Multiply the total length (linear feet) of all walls exposed to the outside by the applicable factor. Doors should

be considered as being part of the wall. Outside walls facing due north should be calculated separately from

outside walls facing other directions. Walls which are permanently shaded by adjacent structures should be

considered “North Exposure.” Do not consider trees and shrubbery as providing permanent shading. An

uninsulated frame wall or a masonry wall 8 inches or less in thickness is considered “Light Construction.” An

insulated wall or masonry wall over 8 inches in thickness is considered “Heavy Construction.”

3b. Multiply the total length (linear feet) of all inside walls between the space to be conditioned and any uncondi-

tioned spaces by the given factor. Do not include inside walls which separate other air conditioned rooms.

4. Multiply the total square feet of roof or ceiling area by the factor given for the type of construction most nearly

describing the particular application (use one line only.)

5. Multiply the total square feet of ﬂoor area by the factor given. Disregard this item if the ﬂoor is directly on the

ground or over a basement.

6. Multiply the number of people who normally occupy the space to be air conditioned by the factor given. Use

a minimum of 2 people.

7. Determine the total number of watts for light and electrical equipment, except the air conditioner itself, that

will be in use when the room air conditioning is operating. Multiply the total wattage by the factor given.

8. Multiply the total width (linear feet) of any doors or arches which are continually open to an unconditioned

space by the applicable factor.

NOTE: Where the width of the doors or arches is more than 5 feet, the actual load may exceed the calculated

value. In such cases, both adjoining rooms should be considered as a single large room, and the room air

conditioner unit or units should be selected according to a calculation made on this new basis.

9. Total the loads estimated for the foregoing 8 items.

10. Multiply the subtotal obtained in item 9 by the proper correction factor, selected from the map, for the particular

locality. The result is the total estimated design cooling load in BTU per hour.

E. For best results, a room air conditioner unit or units having a cooling capacity rating (determined in accordance

with the NEMAStandards Publication for RoomAir Conditioners, CN 1-1960) as close as possible to the estimated

load should be selected. In general, a greatly oversized unit which would operate intermittently will be much less

satisfactory than one which is slightly undersized and which would operate more nearly continuously.

F. Intermittent loads such as kitchen and laundry equipment are not included in this form.

COOLING LOAD ESTIMATE FORM

FACTORS

BTU/Hr.

(Quantity x Factor)

HEAT GAIN FROM

QUANTITY

DAY

Shades*

Outside

(Area

Inside

WINDOWS: Heat gain from the sun.

Awnings* X Factor)

Shades*

Northeast

East

____sq. ft.

Use

only

the

largest ____

load. ____

Use

only

one.

____

20 ____

25 ____

20 ____

30 ____

45 ____

35 ____

0 ____

* These factors are for single glass

only. For glass block, multiply the

above factors by 0.5; for double

glass or storm windows, multiply the

above factors by 0.8.

Southeast

South

Southwest

West

110

150

120

____

Northwest

North

WINDOWS: Heat by conduction

(Total of all windows.)

_____

Single glass

____sq. ft.

Double glass or glass block

WALLS: (Based on linear feet of wall)

a. Outside walls

Light Construction

Heavy Construction

_____

North Exposure

____ ft.

Other than North exposure

b. Inside Walls (between conditioned and

unconditioned spaces only.)

_____

____sq. ft.

ROOF OR CEILING: (Use one only)

a. Roof, uninsulated

b. Roof, 1 inch or more insulation

c. Ceiling, occupied space above

d. Ceiling, insulated, with attic space above

e. Ceiling, uninsulated, with attic space above

_____

____sq. ft.

_____

Floor: (Disregard if ﬂoor is directly on ground or

over a basement.

____sq. ft.

_____

NUMBER OF PEOPLE

600

____

LIGHTS AND ELECTRICAL EQUIPMENT IN USE

____watts

DOORS AND ARCHES CONTINUOUSLY

OPENED TO UNCONDITIONED SPACE: (TOTAL

LINEAR FEET OF WIDTH.)

_____

300

____ft.

*****

SUBTOTAL

*****

10. TOTAL COOLING LOAD (BTU per hour to be used

for selection of room air conditioner(s).)

____ Total in Item 9 X ____ (Factor from Map) =

____

HEAT LOAD FORM

The heat load form on the following page may be used by

Following is an example using the heat load form:

servicingpersonneltodeterminetheheatlossofaconditioned

space and the ambient winter design temperatures in which

the unit will heat the calculated space.

A space to be conditioned is part of a house geographically

located in an area where the lowest outdoor ambient winter

temperature is 40°F. The calculated heat loss is 184 BTU/

Hr./°F.

The upper half of the form is for computing the heat loss of

the space to be conditioned. It is necessary only to insert

the proper measurements on the lines provided and multiply

by the given factors, then add this result for the total heat

loss in BTU/Hr./°F.

Subtract 40°F (lowest outdoor ambient temperature for the

geographical location) from 70°F (inside design temperature

of the unit) for a difference of 30°F. Multiply 184 by 30 for a

5500 BTU/Hr. total heat loss for the calculated space.

The BTU/Hr. per °F temperature difference is the 70°F

inside winter designed temperature minus the lowest outdoor

ambient winter temperature of the area where the unit is

installed. This temperature difference is used as the multiplier

when calculating the heat loss.

On the graph, plot the base point (70°) and a point on the

40°F line where it intersects with the 5500 BTU/Hr. line on

the left scale. Draw a straight line from the base point 70

through the point plotted at 40°F. This is the total heat loss

line.

The graph shows the following:

Knowing that we have a 5500 BTU/Hr. heat loss, and

we expect that our heat pump will maintain a 70°F inside

temperature at 40°F outdoor ambient, we plot the selected

unit capacity BTU/Hr. of the unit between 35° and 60° on the

graph and draw a straight line between these points. Where

the total heat loss line and the unit capacity line intersect,

read down to the outdoor ambient temperature scale and

ﬁnd that this unit will deliver the required BTU/Hr. capacity

to approximately 30°F.

Left Hand Scale

Unit capacity BTU/Hr. or heat loss

BTU/Hr.

Bottom Scale

Outdoor ambient temperature, base

point.

Heat Pump Model

Balance Point

BTU/Hr. capacity heat pump will

deliver at outdoor temperatures.

Maximum BTU/Hr. heat pump

will deliver at indicated ambient

temperature.

HEATING LOAD FORM

FRIEDRICH ROOM UNIT HEAT PUMPS

BTU/HR PER

WALLS: (Linear Feet)

2” Insulation

°F TEMP. DIFFERENCE

Lin. Ft. x 1.6

Average

Lin. Ft. x 2.6

WINDOWS & DOORS (Area, sq. ft.)

Single Glass:

Sq. Ft. x 1.13

Sq. Ft. x 0.61

Double Glass:

INFILTRATION - WINDOWS & DOORS: AVG.

Lin. Ft. x 1.0

Lin. Ft. x 2.0

Loose

CEILING: (Area, Sq. Ft.)

Insulated (6”)

Sq. Ft. x 0.07

Sq. Ft. x 0.10

Sq. Ft. x 0.20

Sq. Ft. x 0.33

Insulated (2”)

Built-up Roof (2” insulated

Built-up Roof (1/2” insulated)

No Insulation

FLOOR: (Area, Sq. Ft.)

Above Vented Crawl space

Insulated (1:)

Sq. Ft. x 0.20

Sq. Ft. x 0.50

Uninsulated

* Slab on Ground

1” Perimeter insulation

* Based on Linear Feet of outside wall

Lin. Ft. x 1.70

Lin. Ft. x 1.00

TOTAL HEAT LOSS PER °F BTU/HR/°F

Multiply total BTU/HR/°F X 30 and plot on the graph below at 40°F. Draw a straight line from

the 70 base point thru the point plotted at 40°F. The intersection of this heat loss line with the

unit capacity line represents the winter design heating load.

Friedrich Air Conditioning Company

P.O. Box 1540

San Antonio, TX 78295

210.357.4400

www.friedrich.com

ROOM AIR CONDITIONERS

LIMITED WARRANTY

FIRST YEAR

ANY PART: If any part supplied by FRIEDRICH fails because of a defect in workmanship or material within twelve months from

date of original purchase, FRIEDRICH will repair the product at no charge, provided room air conditioner is reasonably accessible

for service. Any additional labor cost for removing inaccessible units and/or charges for mileage related to travel by a Service

Agency that exceeds 25 miles one way will be the responsibility of the owner. This remedy is expressly agreed to be the exclusive

remedy within twelve months from the date of the original purchase.

SECOND THROUGH FIFTH YEAR

SEALED REFRIGERANT SYSTEM: If the Sealed Refrigeration System (defined for this purpose as the compressor, condenser

coil, evaporator coil, reversing valve, check valve, capillary, filter drier, and all interconnecting tubing) supplied by FRIEDRICH in

your Room Air Conditioner fails because of a defect in workmanship or material within sixty months from date of purchase,

FRIEDRICH will pay a labor allowance and parts necessary to repair the Sealed Refrigeration System; PROVIDED FRIEDRICH will

not pay the cost of diagnosis of the problem, removal, freight charges, and transportation of the air conditioner to and from the

Service Agency, and the reinstallation charges associated with repair of the Sealed Refrigeration System. All such cost will be the

sole responsibility of the owner. This remedy is expressly agreed to be the exclusive remedy within sixty months from the date of the

original purchase.

APPLICABILITY AND LIMITATIONS: This warranty is applicable only to units retained within the Fifty States of the U.S.A., District

of Columbia, and Canada. This warranty is not applicable to:

1. Air filters or fuses.

2. Products on which the model and serial numbers have been removed.

3. Products which have defects or damage which results from improper installation, wiring, electrical current

characteristics, or maintenance; or caused by accident, misuse or abuse, fire, flood, alterations and/or misapplication

of the product and/or units installed in a corrosive atmosphere, default or delay in performance caused by war,

government restrictions or restraints, strikes, material shortages beyond the control of FRIEDRICH, or acts of God.

OBTAINING WARRANTY PERFORMANCE: Service will be provided by the FRIEDRICH Authorized Dealer or Service

Organization in your area. They are listed in the Yellow Pages. If assistance is required in obtaining warranty performance, write

to: Room Air Conditioner Service Manager, Friedrich Air Conditioning Co., P.O. Box 1540, San Antonio, TX 78295-1540.

LIMITATIONS:

THIS WARRANTY IS GIVEN IN LIEU OF ALL OTHER WARRANTIES. Anything in the warranty

notwithstanding, ANY IMPLIED WARRANTIES OF FITNESS FOR PARTICULAR PURPOSE AND/OR MERCHANTABILITY

SHALL BE LIMITED TO THE DURATION OF THIS EXPRESS WARRANTY. MANUFACTURER EXPRESSLY DISCLAIMS AND

EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGE FOR BREACH OF ANY EXPRESSED OR

IMPLIED WARRANTY.

Performance of Friedrich’s Warranty obligation is limited to one of the following methods:

1. Repair of the unit

2. A refund to the customer for the prorated value of the unit based upon the remaining warranty period of the unit.

3. Providing a replacement unit of equal value

The method of fulfillment of the warranty obligation is at the sole discretion of Friedrich Air Conditioning.

NOTE: Some states do not allow limitations on how long an implied warranty lasts, or do not allow the limitation or exclusion of

consequential or incidental damages, so the foregoing exclusions and limitations may not apply to you.

OTHER: This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

PROOF OF PURCHASE: Owner must provide proof of purchase in order to receive any warranty related services.

All service calls for explaining the operation of this product will be the sole responsibility of the consumer.

All warranty service must be provided by an Authorized FRIEDRICH Service Agency, unless authorized by FRIEDRICH prior to

repairs being made.

(10-08)

TECHNICAL SUPPORT

CONTACT INFORMATION

FRIEDRICH AIR CONDITIONING CO.

Post Ofﬁce Box 1540 · San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212

(210) 357-4400 · FAX (210) 357-4490

www.friedrich.com

Printed in the U.S.A.

FRIEDRICH AIR CONDITIONING CO.

Post Ofﬁce Box 1540 · San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212

(210) 357-4400 · FAX (210) 357-4490

www.friedrich.com

RAC-ServMan (04-09)

Printed in the U.S.A.

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