installation and
591B, 550A
552A, 556A
start-up instructions
11, 12, 13, 14 SEER
SPLIT-SYSTEM AIR CONDITIONERS
WITH PURON® REFRIGERANT
Cancels: II 550A-18-3
II 550A-18-4
11-03
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory-authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions thor-
oughly and follow all warnings or cautions included in literature
and attached to the unit. Consult local building codes and National
Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety-alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
.
A98515
Fig. 1—Models 591B, 550A, 552A, and 556A
Understand these signal words; DANGER, WARNING, and
CAUTION. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which would result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
4. Leave some slack between structure and unit to absorb
vibration.
5. When passing refrigerant tubes through the wall, seal
opening with RTV or other pliable silicon-based caulk. (See
Fig. 2.)
6. Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs with
a rigid wire or strap which comes in direct contact with
tubing. (See Fig. 2.)
WARNING: Before installing, modifying, or servicing
system, main electrical disconnect switch must be in the
OFF position. There may be more than 1 disconnect
switch. Lock out and tag switch with a suitable warning
label. Electrical shock can cause personal injury or death.
8. Ensure that tubing insulation is pliable and completely
surrounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 2.)
10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.
When outdoor unit is connected to factory-approved indoor unit,
outdoor unit contains system refrigerant charge for operation with
ARI rated indoor unit when connected by 15 ft of field-supplied or
factory accessory tubing. For proper unit operation, check refrig-
erant charge using charging information located on control box
cover and/or in the Check Charge section of this instruction.
IMPORTANT: Maximum liquid-line size is 3/8-in. O.D. for all
residential applications including long line.
IMPORTANT: Always install the factory-supplied liquid-line
filter drier. If replacing the filter drier, refer to Product Data Sheet
for appropriate part number. Obtain replacement filter driers from
your distributor or branch.
CAUTION: Puron® systems operate at higher pressures
than standard R-22 systems. To avoid damage to the unit
or possible personal injury, do not use R-22 service
equipment or components on Puron® equipment.
INSTALLATION RECOMMENDATIONS
NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
1. Locate unit away from windows, patios, decks, etc. where
unit operation sound may disturb customer.
2. Ensure that vapor and liquid tube diameters are appropriate
to capacity of unit.
INSTALLATION
Specifications for this unit in residential new construction market
require the outdoor unit, indoor unit, refrigerant tubing sets,
metering device, and filter drier listed in presale literature. There
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary turns and bends.
—1—
INSTALLING TXV IN PLACE OF PISTON
10 O'CLOCK
2 O'CLOCK
1. Pump system down to 2 psig and recover refrigerant.
SENSING BULB
2. Remove hex nut from piston body. Use backup wrench on
fan coils.
STRAP
3. Remove and discard factory-installed piston. Be sure teflon
seal is in place.
4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.
SUCTION TUBE
8 O'CLOCK
7⁄8 IN. OD & SMALLER
NOTE: If the piston is not removed from the body, TXV will not
function properly.
4 O'CLOCK
LARGER THAN 7⁄8 IN. OD
CAUTION: To prevent damage to the unit, use a brazing
shield and wrap TXV with wet cloth or use heat sink
material.
A81032
Fig. 5—Position of Sensing Bulb
5. Install TXV on indoor coil liquid line. Sweat swivel adapter
to inlet of indoor coil and attach to TXV outlet. Use backup
wrench to avoid damage to tubing or valve. Sweat inlet of
TXV, marked “IN” to liquid line. Avoid excessive heat
which could damage valve.
3. Remove TXV support clamp using a 5/16-in. nut driver.
Save the clamp.
4. Remove R-22 TXV using a backup wrench on flare
connections to prevent damage to tubing.
6. Install vapor elbow with equalizer adapter to suction tube of
line set and suction connection to indoor coil. Adapter has
a 1/4-in. male connector for attaching equalizer tube.
5. Using wire cutters, cut equalizer tube off flush with vapor
tube inside cabinet.
6. Remove bulb from vapor tube inside cabinet.
7. Connect equalizer tube of TXV to 1/4-in. equalizer fitting
on vapor line adapter.
7. Braze equalizer stub-tube closed. Use protective barrier as
necessary to prevent damage to drain pan.
8. Attach TXV bulb to horizontal section of suction line using
clamps provided. Insulate bulb with field-supplied insula-
tion tape. See Fig. 5 for correct positioning of sensing bulb.
IMPORTANT: Route the equalizer tube of Puron® TXV
through suction line connection opening in fitting panel prior to
replacing fitting panel around tubing.
9. Proceed with remainder of unit installation.
REPLACING TXV ON R-22 INDOOR COIL
1. Pump system down to 2 psig and recover refrigerant.
8. Install TXV with 3/8-in. copper tubing through small hole
in service panel. Use wrench and backup wrench, to avoid
damage to tubing or valve, to attach TXV to distributor.
2. Remove coil access panel and fitting panel from front of
cabinet.
9. Reinstall TXV support clamp (removed in item 3).
10. Attach TXV bulb to vapor tube inside cabinet, in same
location as original was when removed, using supplied bulb
clamps (nylon or copper). See Fig. 5 for correct positioning
of sensing bulb.
PISTON
RETAINER
PISTON
RING
PISTON
11. Route equalizer tube through suction connection opening
(large hole) in fitting panel and install fitting panel in place.
PISTON
BODY
12. Sweat inlet of TXV, marked “IN” to liquid line. Avoid
excessive heat which could damage valve.
13. Install vapor elbow with equalizer adapter to vapor line of
line set and vapor connection to indoor coil. Adapter has a
1/4-in. male connector for attaching equalizer tube.
14. Connect equalizer tube of TXV to 1/4-in. equalizer fitting
on vapor line adapter. Use backup wrench to prevent
damage to equalizer fitting.
FIELD
CONNECTION
STRAINER
15. Proceed with remainder of unit installation.
CAUTION: To avoid improper performance and pos-
sible equipment failure, remove indoor coil piston if unit
is to be installed on system with a TXV metering device.
FLARE
ADAPTER
LIQUID LINE STRAINER
APPROX 2” LONG
VII. MAKE PIPING CONNECTIONS
STRAINER LABEL
WARNING: Relieve pressure and recover all refrigerant
before system repair or final unit disposal to avoid
personal injury or death. Use all service ports and open all
flow-control devices, including solenoid valves.
(AFFIX TO LIQ. LINE
NEAR STRAINER LOCATION
A01019
Fig. 4—Check-Flo-Rater® Components
(550A, 552A, 591B Only)
—3—
TABLE 1—REFRIGERANT CONNECTIONS AND RECOMMENDED LIQUID AND VAPOR TUBE DIAMETERS (IN.)
LIQUID
Connection Diameter
VAPOR
Connection Diameter
VAPOR (LONG LINE)
Connection Diameter Tube Diameter
UNIT SIZE
Tube Diameter
Tube Diameter
018, 024
030, 036
042, 048
060
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
5/8
3/4
7/8
7/8
5/8
3/4
5/8
3/4
7/8
7/8
3/4
7/8
7/8
1-1/8
1-1/8
1-1/8
NOTES:
1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult the Application Guideline and Service Manual—Air Conditioners and Heat Pumps
Using Puron®.
2. Do not apply capillary tube indoor coils to these units.
TABLE 2—ACCESSORY USAGE
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(OVER 50 FT)
REQUIRED FOR
SEA COAST
APPLICATIONS
(WITHIN 2 MILES)
ACCESSORY
Crankcase Heater
Evaporator Freeze Thermostat
Winter Start Control
Accumulator
Yes
Yes
Yes†
No
Yes
No
No
No
No
No
No
No
Compressor Start Assist
Capacitor and Relay
Yes
Yes
No
MotorMaster® Control,
or
Yes
No
No
Low-Ambient Pressure Switch
Wind Baffle
Coastal Filter
Support Feet
See Low-Ambient Instructions
No
No
No
No
Yes
No
Recommended
Recommended
Liquid-Line Solenoid Valve
or
No
See Long-Line Application Guideline
No
Hard Shutoff TXV
Ball Bearing Fan Motor
Yes‡
No
No
* For Tubing Sets between 50 and 175 ft horizontal or 20 ft vertical differential, refer to the Application Guideline and Service Manual—Air Conditioners and Heat Pumps
Using Puron®.
† Only when low-pressure switch is used.
‡ Required for low-ambient controller (full modulation feature) and MotorMaster® Control only.
Manual—Air Conditioners and Heat Pumps Using Puron® Refrig-
erant will reduce these losses. Refer to Table 1 for field tubing
diameters. Refer to Table 2 for accessory requirements.
CAUTION: To prevent improper performance and/or
unit component failures, do not leave system open to
atmosphere any longer than minimum required for instal-
lation. POE oil in compressor is extremely susceptible to
moisture absorption. Always keep ends of tubing sealed
during installation.
There are no buried-line applications greater than 36 in.
If refrigerant tubes or indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and
moisture in the system.
A. OUTDOOR UNIT CONNECTED TO FACTORY-
APPROVED INDOOR UNIT
CAUTION: To prevent improper performance or equip-
ment failure this caution must be followed. If ANY
refrigerant tubing is buried, provide a 6 in. vertical rise at
service valve. Refrigerant tubing lengths up to 36 in. may
be buried without further special consideration. Do not
bury lines over 36 in. in length.
Factory refrigerant charge is for a 15 ft line set. Outdoor unit
contains correct system refrigerant charge for operation with ARI
rated indoor unit. Check refrigerant charge for maximum effi-
ciency. The charge must be adjusted based on the actual line set
length. Add or subtract 0.6 oz/ft for line sets longer or shorter than
15 ft.
B. INSTALL LIQUID-LINE FILTER DRIER
CAUTION: To prevent damage to unit or service valves
observe the following:
• Use a brazing shield.
• Wrap service valves with wet cloth or use a heat sink
material.
CAUTION: To avoid performance loss and compressor
failure, installation of filter drier in liquid line is required.
Refer to Fig. 6 and install filter drier as follows:
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. For tubing requirements beyond 50 ft, substan-
tial capacity and performance losses can occur. Following the
recommendations in the Application Guideline and Service
1. Braze 5-in. connector tube to liquid service valve. Wrap
filter drier with damp cloth.
2. Braze filter drier between connector tube and liquid tube to
indoor coil. Flow arrow must point towards indoor coil.
—4—
C. REFRIGERANT TUBING
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
Connect vapor tube to fitting on outdoor unit vapor service valves.
Connect liquid tube to filter drier. (See Fig. 6 and Table 1.) Use
refrigerant grade tubing.
LEAK IN
SYSTEM
LIQUID-LINE
FILTER-DRIER
LIQUID
SERVICE
A
VALVE
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
CONNECTOR
TUBE
A95424
0
1
2
3
4
5
6
7
MINUTES
A95424
Fig. 7—Deep Vacuum Graph
5. Repeat this procedure as indicated in Fig. 8. System will
then be free of any contaminants and water vapor.
A95509
Fig. 6—Liquid-Line Filter Drier
EVACUATE
D. SWEAT CONNECTION
BREAK VACUUM WITH DRY NITROGEN
CAUTION: To avoid valve damage while brazing, ser-
vice valves must be wrapped in a heat-sinking material
such as a wet cloth.
WAIT
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
Use refrigerant grade tubing. Service valves are closed from
factory and ready for brazing. After wrapping service valve with a
wet cloth, braze sweat connections using industry accepted meth-
ods and materials. Consult local code requirements. Refrigerant
tubing and indoor coil are now ready for leak testing. This check
should include all field and factory joints.
E. EVACUATE REFRIGERANT TUBING AND INDOOR
COIL
EVACUATE
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
CAUTION: To avoid compressor damage, never use
the system compressor as a vacuum pump.
CHARGE SYSTEM
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used if the procedure outlined
below is followed. Always break a vacuum with dry nitrogen.
A95425
Fig. 8—Triple Evacuation Method
VIII. MAKE ELECTRICAL CONNECTIONS
DEEP VACUUM METHOD
WARNING: To avoid personal injury or death, do not
supply power to unit with compressor terminal box cover
removed.
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum
method is the most positive way of assuring a system is free of air
and liquid water. (See Fig. 7.)
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
TRIPLE EVACUATION METHOD
The triple evacuation method should only be used when vacuum
pump is only capable of pumping down to 28 in. of mercury
vacuum and system does not contain any liquid water. Refer to
Fig. 8 and proceed is as follows:
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do not
install unit in system where voltage may fluctuate above or below
permissible limits.
1. Pump system down to 28 in. of mercury and allow pump to
continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a dry nitrogen cylinder and regulator to system and
open until system pressure is 2 psig.
NOTE: Use copper wire only between disconnect switch and
unit.
4. Close service valve and allow system to stand for 1 hr.
During this time, dry nitrogen will be able to diffuse
throughout the system absorbing moisture.
NOTE: Install branch circuit disconnect of adequate size per
NEC to handle unit starting current. Locate disconnect within sight
from and readily accessible from unit, per Section 440-14 of NEC.
—5—
A. ROUTE GROUND AND POWER WIRES
XI. START-UP
CAUTION: To prevent compressor damage or personal
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
injury, observe the following:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
• Do not disable low-pressure switch.
In scroll compressor applications:
WARNING: The unit cabinet must have an uninter-
rupted or unbroken ground to minimize personal injury if
an electrical fault should occur. The ground may consist
of electrical wire or metal conduit when installed in
accordance with existing electrical codes. Failure to
follow this warning can result in an electric shock, fire, or
death.
• Dome temperatures may be hot.
CAUTION: To prevent personal injury wear safety
glasses, protective clothing, and gloves when handling
refrigerant and observe the following:
• Back seating service valves are not equipped with
Schrader valves. Fully back seat (counter clockwise)
valve stem before removing gage port cap.
• Front seating service valves are equipped with Schrader
valves.
B. CONNECT GROUND AND POWER WIRES
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 9.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CAUTION: Federal regulations require that you do not
vent refrigerant to atmosphere. Recover during system
repair or final unit disposal.
CONTACTOR
FIELD POWER
WIRING
Follow these steps to properly start up the system:
1. After system is evacuated, fully back seat (open) liquid and
vapor service valves.
FIELD GROUND
2. Unit is shipped with valve stem(s) front seated (closed) and
caps installed. Replace stem caps after system is opened to
refrigerant flow (back seated). Replace caps finger-tight and
tighten with wrench an additional 1/12 turn.
WIRING
GROUND
LUG
A91056
Fig. 9—Line Power Connections
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure set
point is below indoor ambient temperature.
C. CONNECT CONTROL WIRING
5. Set room thermostat to COOL and fan control to ON or
AUTO mode, as desired. Operate unit for 15 minutes.
Check system refrigerant charge.
Route 24v control wires through control wiring grommet and
connect leads to control wiring. (See Fig. 10.)
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft from unit, as measured
along the control voltage wires, use No. 16 AWG color-coded wire
to avoid excessive voltage drop.
A. SEQUENCE OF OPERATION
Turn on power to indoor and outdoor units. Transformer is
energized.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
On a call for cooling, thermostat makes circuits R-Y and R-G.
Circuit R-Y energizes contactor, starting outdoor fan motor and
compressor circuit. R-G energizes indoor unit blower relay,
starting indoor blower motor on high speed.
Use furnace transformer, fan coil transformer, or accessory trans-
former for control power, 24v/40va minimum.
When thermostat is satisfied, its contacts open, de-energizing
contactor and blower relay. Compressor and motors stop.
NOTE: Use of available 24v accessories may exceed the mini-
mum 40-va power requirement. Determine total transformer load-
ing and increase the transformer capacity or split the load with an
accessory transformer as required.
If indoor unit is equipped with a time-delay relay circuit, the
indoor blower will run an additional 90 sec to increase system
efficiency.
IX. COMPRESSOR CRANKCASE HEATER
XII. CHECK CHARGE
A. UNIT CHARGE
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hr before starting unit. To furnish power to heater
only, set thermostat to OFF and close electrical disconnect to
outdoor unit.
Factory charge and charging method are shown on unit informa-
tion plate. Puron® refrigerant cylinders contain a dip tube
which allows liquid refrigerant to flow from cylinder in
upright position. Charge Puron® units with cylinder in upright
position and a commercial-type metering device in manifold hose.
Charge refrigerant into suction line.
A crankcase heater is required if refrigerant tubing is longer than
50 ft. Refer to the Application Guideline and Service Manual—Air
Conditioner and Heat Pump Using Puron® Refrigerant.
X. INSTALL ELECTRICAL ACCESSORIES
NOTE: Charge must be adjusted in accordance with unit rating
plate, ±0.6 oz/ft of 3/8-in. liquid line above or below 15 ft,
respectively.
Refer to the individual instructions packaged with kits or acces-
sories when installing.
—6—
TABLE 3—REQUIRED LIQUID-LINE TEMPERATURE (°F)
REQUIRED SUBCOOLING
TEMPERATURE
(°F)
LIQUID
PRESSURE AT
SERVICE VALVE
(PSIG)
8
10
56
12
54
14
52
16
50
18
48
189
195
202
208
215
222
229
236
243
251
259
266
274
283
291
299
308
317
326
335
345
354
364
374
384
395
406
416
427
439
450
462
474
486
499
511
58
60
58
56
54
52
50
62
60
58
56
54
52
64
62
60
58
56
54
66
64
62
60
58
56
68
66
64
62
60
58
70
68
66
64
62
60
72
70
68
66
64
62
74
72
70
68
66
64
76
74
72
70
68
66
78
76
74
72
70
68
80
78
76
74
72
70
82
80
78
76
74
72
84
82
80
78
76
74
86
84
82
80
78
76
88
86
84
82
80
78
90
88
86
84
82
80
92
90
88
86
84
82
94
92
90
88
86
84
96
94
92
90
88
86
98
96
94
92
90
88
100
102
104
106
108
110
112
114
116
118
120
122
124
126
128
98
96
94
92
90
100
102
104
106
108
110
112
114
116
118
120
122
124
126
98
96
94
92
100
102
104
106
108
110
112
114
116
118
120
122
124
98
96
94
100
102
104
106
108
110
112
114
116
118
120
122
98
96
100
102
104
106
108
110
112
114
116
118
120
98
100
102
104
106
108
110
112
114
116
118
EXAMPLE:
6. To obtain required subcooling temperature at a specific
liquid line pressure, add refrigerant if liquid line tempera-
ture is higher than indicated or reclaim refrigerant if
temperature is lower. Allow a tolerance of ± 3°F.
To calculate additional charge requried for a 25-ft line set:
25 ft - 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge.
B. COOLING ONLY PROCEDURE
UNITS WITH INDOOR PISTONS
UNITS WITH COOLING MODE PURON® TXV
Units installed with indoor pistons require charging by the super-
heat method.
Units installed with cooling mode TXV require charging by the
subcooling method.
The following procedure is valid when indoor airflow is within ±
21 percent of its rated CFM.
1. Operate unit a minimum of 10 minutes before checking
charge.
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching an
accurate gage to service port.
2. Measure suction pressure by attaching an accurate gage to
suction valve service port.
3. Measure liquid line temperature by attaching an accurate
thermistor type or electronic thermometer to liquid line near
outdoor coil.
3. Measure suction temperature by attaching an accurate
thermistor type or electronic thermometer to suction line at
service valve.
4. Refer to unit rating plate for required subcooling tempera-
ture.
4. Measure outdoor air dry-bulb temperature with thermom-
eter.
5. Refer to Table 3. Find the point where required subcooling
temperature intersects measured liquid service valve pres-
sure.
5. Measure indoor air (entering indoor coil) wet-bulb tempera-
ture with a sling psychrometer.
—7—
TABLE 4—SUPERHEAT CHARGING
EVAPORATOR ENTERING AIR TEMPERATURE (°F WB)
OUTDOOR TEMP (°F)
50
9
52
12
10
6
54
14
12
10
7
56
17
15
13
10
6
58
20
18
16
13
9
60
23
21
19
16
12
8
62
26
24
21
19
15
12
8
64
29
27
24
21
18
15
11
9
66
32
30
27
24
21
18
15
13
10
8
68
35
33
30
27
24
21
19
16
14
12
9
70
37
35
33
30
28
25
22
20
18
15
13
11
8
72
40
38
36
33
31
28
26
24
22
20
17
15
14
74
42
40
38
36
34
31
30
27
25
23
22
20
18
76
45
43
41
39
37
35
33
31
29
27
26
25
23
55
60
7
65
—
—
—
—
—
—
—
—
—
—
—
70
—
—
—
—
—
—
—
—
—
—
75
—
—
—
—
—
—
—
—
—
80
—
—
—
—
—
—
—
—
5
85
—
—
—
—
—
—
—
—
—
—
—
—
—
—
90
5
95
—
—
—
—
—
6
100
105
110
115
—
—
—
—
5
—
—
6
—
Where a dash (—) appears, do not attempt to charge system under these conditions or refrigerant slugging may occur. Charge must be weighed in.
NOTE: Superheat °F is at low-side service port.
6. Refer to Table 4. Find outdoor temperature and evaporator
entering air wet-bulb temperature. At this intersection, note
superheat.
2. Ensure that all wiring and tubing is secure in unit before
adding panels and covers. Securely fasten all panels and
covers.
7. Refer to Table 5. Find superheat temperature located in item
6 and suction pressure. At this intersection, note suction line
temperature.
3. Tighten service valve stem caps to 1/12-turn past finger
tight.
4. Leave User’s Manual with owner. Explain system operation
and periodic maintenance requirements outlined in manual.
8. If unit has a higher suction line temperature than charted
temperature, add refrigerant until charted temperature is
reached.
5. Fill out Dealer Installation Checklist and place in customer
file.
9. If unit has a lower suction line temperature than charted
temperature, reclaim refrigerant until charted temperature is
reached.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equip-
ment failure, periodic maintenance must be performed on this
equipment.
10. When adding refrigerant, charge in liquid form into suction
service port using a flow-restricting device.
11. If outdoor air temperature or pressure at suction valve
changes, charge to new suction line temperature indicated
on chart.
Frequency of maintenance may vary depending upon geographic
areas, such as coastal applications. See Users Manual for informa-
tion.
XIII. FINAL CHECKS
IMPORTANT: Before leaving job, be sure to do the following:
1. Ensure that all wiring is routed away from tubing and sheet
metal edges to prevent rub-through or wire pinching.
TABLE 5—REQUIRED SUCTION-LINE TEMPERATURE
SUPERHEAT
SUCTION PRESSURE AT SERVICE PORT (PSIG)
TEMP
(°F)
0
107.8
112.2
116.8
121.2
126.0
130.8
138.8
140.8
145.8
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
41
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
43
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
45
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
47
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
91
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
—8—
BRYANT
NON-PROGRAMMABLE
THERMOSTAT
BRYANT
NON-PROGRAMMABLE
THERMOSTAT
FA, FB, FC,
FD, FF
FAN COIL
AIR
SINGLE-STAGE
FURNACE
AIR
CONDITIONER
MODEL AC
CONDITIONER
MODEL AC
24 VAC HOT
24 VAC COM
24 VAC HOT
24 VAC COM
R
C
R
C
W
Y
R
C
R
C
SEE
NOTE 2
SEE
NOTE 2
C
HEAT STAGE 1 W/W1
C
HEAT STAGE 1 W/W1
W2
COOL STAGE 1
Y/Y2
COOL STAGE 1
INDOOR FAN
Y/Y2
G
INDOOR FAN
G
G
G
A97359
A97360
BRYANT
PROGRAMMABLE
THERMOSTAT
MODEL AC
BRYANT
PROGRAMMABLE
THERMOSTAT
MODEL AC
FA, FB,
FC, FD, FF
FAN COIL
AIR
CONDITIONER
SINGLE-STAGE
FURNACE
AIR
CONDITIONER
R
G
R
G
R
G
24 VAC HOT
R
24 VAC HOT
INDOOR FAN
HEAT STAGE 1
G
INDOOR FAN
HEAT STAGE 1
W2
W/W1
Y/Y2
W
Y
W/W1
Y/Y2
COOL STAGE 1
NOT USED
COOL STAGE 1
NOT USED
O/W2
Y1/ W2
O/W2
Y1/W2
SEE
NOTE 2
SEE
NOTE 2
C
C
NOT USED
NOT USED
C
C
B
L
24 VAC COM
NOT USED
NOT USED
C
B
L
C
24 VAC COM
NOT USED
NOT USED
S1
S2
S1
S2
OPTIONAL
OUTDOOR
SENSOR
OPTIONAL
OUTDOOR
SENSOR
CONNECTION
CONNECTION
A97361
A97362
OTHER
NON-PROGRAMMABLE
AC THERMOSTAT
OTHER
NON-PROGRAMMABLE
AC THERMOSTAT
FA, FB, FC,
FD, FF
SINGLE-STAGE
FURNACE
AIR
AIR
CONDITIONER
FAN COIL CONDITIONER
R
R
C
24 VAC HOT
24 VAC HOT
R
R
SEE
NOTE 2
C
C
W
Y
HEAT STAGE 1
W
Y
SEE
NOTE 2
C
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN
W
Y
W2
COOL STAGE 1
INDOOR FAN
G
G
G
G
A97367
A97366
Fig. 10—Typical 24v Circuit Connections
—9—
BRYANT
PROGRAMMABLE
THERMOSTAT
MODEL AC
BRYANT
NON-PROGRAMMABLE
THERMOSTAT
AIR
AIR
FK4C
FAN COIL
FK4C
FAN COIL
CONDITIONER
CONDITIONER
MODEL AC
J1 JUMPER
DH
R
DH
R
R
R
C
24 VAC HOT
24 VAC HOT
24 VAC COM
HEAT STAGE 1
G
INDOOR FAN
HEAT STAGE 1
J1 JUMPER
J2 JUMPER
C
G
J2 JUMPER
W/W1
Y/Y2
W/W1
Y/Y2
G
W1
W2
Y/Y2
G
SEE
NOTE 2
W1
W2
C
COOL STAGE 1
NOT USED
COOL STAGE 1
INDOOR FAN
O/W2
Y1/W2
Y/Y2
NOT USED
SEE
NOTE 2
C
O
Y1
C
Y1
O
C
B
L
24 VAC COM
NOT USED
NOT USED
A97363
OTHER
NON-PROGRAMMABLE
AC THERMOSTAT
AIR
FK4C
FAN COIL
CONDITIONER
S1
S2
OPTIONAL
OUTDOOR
SENSOR
J1 JUMPER
DH
R
24 VAC HOT
CONNECTION
R
C
A97364
J2
JUMPER
W
Y
HEAT STAGE 1
W1
W2
Y/Y2
G
SEE
NOTE 2
C
COOL STAGE 1
INDOOR FAN
G
O
Y1
A97365
Fig. 10—Typical 24v Circuit Connections (Continued)
NOTES:
1. BRYANT THERMOSTAT WIRING DIAGRAMS ARE ONLY ACCURATE FOR MODEL NUMBERS TSTAT _ _ _ _ _ _ _.
2. WIRING MUST CONFORM TO NEC OR LOCAL CODES.
3. SOME UNITS ARE EQUIPPED WITH PRESSURE SWITCH(ES), TEMPERATURE SWITCH, OR 5-MINUTE COMPRESSOR
CYCLE PROTECTION. CONNECT 24V FIELD WIRING TO FACTORY-PROVIDED STRIPPED LEADS.
4. A LIQUID-LINE SOLENOID VALVE IS REQUIRED ON SOME UNITS. SEE SPECIFIC UNIT INSTRUCTIONS.
5. THERMOSTATS ARE FACTORY CONFIGURED WITH 5-MINUTE COMPRESSOR CYCLE PROTECTION AND 4 CYCLES PER
HOUR LIMIT. SEE THERMOSTAT INSTALLATION INSTRUCTIONS FOR DETAILS.
6. TO STAGE ELECTRIC RESISTANCE HEAT, CONSULT OUTDOOR THERMOSTAT INSTALLATION INSTRUCTIONS.
—10—
PURON® (R–410A) QUICK REFERENCE GUIDE
• Puron® refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment and replacement
components are designed to operate with Puron®
• Puron® refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
• Puron® systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when
charging into suction line with compressor operating
• Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low-side retard. • Use hoses with 700 psig
service pressure rating.
• Leak detectors should be designed to detect HFC refrigerant.
• Puron®, as with other HFCs, is only compatible with POE oils.
• Vacuum pumps will not remove moisture from oil.
• Do not use liquid-line filter driers with rated working pressures less than 600 psig.
• Do not leave Puron® suction line filter driers in line longer than 72 hours.
• Do not install a suction-line filter drier in liquid line.
• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
• POE Oils may cause damage to certain plastics and roofing materials.
• Wrap all filter driers and service valves with wet cloth when brazing.
• A factory approved liquid-line filter drier is required on every unit.
• Do NOT use an R-22 TXV.
• If indoor unit is equipped with an R-22 TXV, it must be changed to a Puron® TXV.
• Never open system to atmosphere while it is under a vacuum.
• When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter
driers. Evacuate to 500 microns prior to recharging.
• Do not vent Puron® into the atmosphere.
• Do not use capillary tube coils.
• Observe all warnings, cautions, and bold text.
—11—
© 2003 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231
Printed in U.S.A.
550a184
Catalog No. 5355-020
—12—
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