48PD05,06
48PG03---16
Gas Heating/Electric Cooling Rooftop Units
with PURONR (R---410A) Refrigerant
User’s Information Manual
NOTE TO INSTALLER:
SAFETY CONSIDERATIONS
This manual should be left with the equipment owner.
Improper installation, adjustment, alteration, service, maintenance,
or use can cause fire, electrical shock, or other conditions which
may cause 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.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
DETERMINE TYPE OF UNIT CONTROL . . . . . . . . . . . . . . . 2
TO LIGHT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Units With Electro--Mechanical Control . . . . . . . . . . . . . . . . . 2
Units With ComfortLinkt Control . . . . . . . . . . . . . . . . . . . . . 3
TO SHUT UNIT OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Units With Electro--Mechanical Control . . . . . . . . . . . . . . . . . 6
Units With ComfortLinkt Control . . . . . . . . . . . . . . . . . . . . . 6
MAINTAINING YOUR UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Follow all safety codes. Wear safety glasses and work gloves.
Have fire extinguishers available.
Recognize safety information. This is the safety--alert symbol
When you see this symbol on the furnace and in instructions or
manuals, be alert to the potential for personal injury.
.
Understand the 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 a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may 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.
ROUTINE MAINTENANCE AND CARE FOR THE
EQUIPMENT OWNER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Air Filter(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Alarm Status (Units with ComfortLink Control) . . . . . . . . . . 10
Integrated Gas Controller (IGC) . . . . . . . . . . . . . . . . . . . . . . . 10
Combustion Area and Vent System . . . . . . . . . . . . . . . . . . . . 10
Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Evaporator, Condenser and Combustion Fan Motors . . . . . . . 10
Indoor Fan, Belt and Pulleys . . . . . . . . . . . . . . . . . . . . . . . . . 10
Indoor Fan Shaft Bearings (Sizes 03--14) . . . . . . . . . . . . . . . . 10
Indoor Fan Shaft Bearings (Size 16) . . . . . . . . . . . . . . . . . . . 10
Refrigerant Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Evaporator and Condenser Coils . . . . . . . . . . . . . . . . . . . . . . 10
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Condenser Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Controls and Wiring . . . . . . . . . . . . . . . . . . . . . . . . 11
Unit Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
REGULAR DEALER MAINTENANCE . . . . . . . . . . . . . . . . 11
!
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch or use any
phone in your building.
3. Leave the building immediately.
3. IMMEDIATELY call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
4. If you cannot reach your gas supplier, call the fire
department.
BEFORE YOU CALL FOR SERVICE CHECK FOR
SEVERAL EASILY SOLVED PROBLEMS . . . . . . . . . . . . . . 11
Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
If insufficient heating or cooling is suspected . . . . . . . . . . . . . 11
If your unit is not operating at all . . . . . . . . . . . . . . . . . . . . . . 11
IN CASE OF TROUBLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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See Fig. 1. for location of gas valve. Refer to Fig. 3 while
proceeding with the following steps:
Step 10 — Set room thermostat selector slightly above room
temperature and set system switch to HEAT position to start the
unit. The induced--draft combustion air fan will start. Main burners
light within 30 seconds. Indoor blower will start within 60 to 90
seconds of main gas ignition.
Step 1 — Turn off the unit by using the Scrolling Marquee to
put the unit into Service Test mode. The Scrolling Marquee is
located on the front of the unit control box behind the control box
and compressor access door. Thermostat inputs and remote
network commands are ignored when Service Test mode is ON.
Step 11 — Set the temperature selector on room thermostat to
desired setting.
NOTE: A password may be required to change Service Test
values, depending on previous settings configured in the unit.
Default password is “1111.”
a. Press the ESCAPE key until a blank screen is shown.
b. Use the arrow keys to scroll the red LED on the display
to the “Service Test” position and press ENTER.
c. The control will display the Field Service Test Mode
(TEST) setting. Press ENTER once to select the TEST
setting for configuration. Press ENTER again for “OFF”
to begin flashing.
d. Use the arrow keys to change the configuration from
“OFF” to “ON,” then press ENTER to save the setting.
Step 2 — Close the shutoff valve on the gas supply piping.
Step 3 — Turn off the electrical supply to the unit and install
INDUCED
DRAFT
MOTOR
lockout tag.
COMBUSTION
FAN HOUSING
Step 4 — Open the heat section access panel.
Step 5 — Move ON/OFF switch on the internal gas valve to the
OFF position and wait 5 minutes.
MAIN GAS
VALVE
Step 6 — Move ON/OFF switch on internal gas valve to ON
position.
HEAT EXCHANGER
SECTION
MAIN BURNER SECTION
Step 7 — Close the heat section access panel.
Step 8 — Remove lockout tag and turn on the electrical supply
C06258
Fig. 1 -- Typical Gas Heating Section
to unit.
NOTE: Normal operation will automatically begin. Service Test
mode will automatically end (exit) after a recycle of power.
!
WARNING
Step 9 — Open the shutoff valve on the external gas supply
piping.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Step 10 — To test the operation of the gas section, the HEAT
submenu of Service Test may be used. See the Controls, Start--Up,
Operation, Service, and Troubleshooting Instructions for more
details on use of Service Test.
If the main burners fail to light, or the blower fails to come on,
shut down gas heating section and call your dealer for service.
Step 11 — For normal operation, make sure that the set points
are at the normal heat set points.
TO LIGHT UNIT
(UNITS WITH COMFORTLINKt
CONTROL)
!
WARNING
!
DANGER
FIRE, EXPLOSION HAZARD
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Failure to follow this warning could result in personal injury,
death, and/or property damage.
If the main burners fail to light, or the blower fails to come on,
shut down gas heating section and call your dealer for service.
1. Do not turn off the electrical power to unit without first
turning off the gas supply and applying lockout tags.
2. Before attempting to start the gas heating section, familiarize
yourself with all the procedures that must be followed.
3. Never attempt to manually light the burners on the unit with
a match, lighter, or any other flame. If the electric sparking
device fails to light the burners, refer to the shutdown
procedures, then call your dealer as soon as possible.
3
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MAIN
ON
OFF
UT
-O
G
CK
LO
TA
STEP 3
STEP 2
STEP 1
Single-Stage
RTU gas valve
Two-Stage
RTU gas valve
On/Off
Switch
On/Off
Switch
CONTROL I.D.
LABEL
CONTROL I.D.
LABEL
SWITCH (SHIPPED IN
“ON” POSITION)
SWITCH (SHIPPED IN
“ON” POSITION)
1/4˝ X .032˝ MALE SPADE
TERMINALS (2) COMMON
1/4˝ X .032˝ MALE SPADE
TERMINALS (2) COMMON
STEP 6
STEP 4
STEP 5
STEP 7
STEP 9
STEP 8
STEP 10
C08541
Fig. 2 -- To Light Unit (Units with Electro--Mechanical Control)
4
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MAIN
MODE
Run Status
Service Test
Temperature
ON
Pressures
Setpoints
Inputs
Alarm Status
Outputs
Configuration
Time Clock
Operating Modes
Alarms
ESCAPE ENTER
OFF
STEP 1
T
U
-O
K
C
LO
STEP 2
G
TA
STEP 3
Single-Stage
RTU gas valve
Two-Stage
RTU gas valve
On/Off
Switch
On/Off
Switch
STEP 4
STEP 6
STEP 5
STEP 7
STEP 9
STEP 8
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Alarm Status
Outputs
Configuration
Time Clock
Operating Modes
Alarms
ESCAPE ENTER
STEP 10
C08542
Fig. 3 -- To Light Unit (Units with ComfortLinkt Control)
5
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TO SHUT UNIT OFF
(UNITS WITH ELECTRO--MECHANICAL
CONTROL)
TO SHUT UNIT OFF
(UNITS WITH COMFORTLINKt
CONTROL)
!
!
WARNING
WARNING
FIRE HAZARD
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Do not turn off the electrical power to unit without first turning
off the gas supply. Should the gas supply fail to shut off or if
overheating occurs, shut off the gas valve to the unit before
shutting off the electrical supply. Make sure to apply lockout
tags.
Do not turn off the electrical power to unit without first turning
off the gas supply. Should the gas supply fail to shut off or if
overheating occurs, shut off the gas valve to the unit before
shutting off the electrical supply. Make sure to apply lockout
tags.
See Fig. 1. for location of gas valve. Refer to Fig. 4 while
proceeding with the following steps:
See Fig. 1. for location of gas valve. Refer to Fig. 5 while
proceeding with the following steps:
Step 1 — Set room thermostat to lowest temperature setting and
set SYSTEM switch to OFF position.
Step 1 — Turn off the unit operation by using the Scrolling
Marquee to put the unit into Service Test mode. The Scrolling
Marquee is located on the front of the unit control box behind the
control box and compressor access door. (See Fig. 6.) Thermostat
inputs and remote network commands are ignored when Service
Test mode is ON.
Step 2 — Close the shutoff valve on the external gas supply
piping.
Step 3 — Turn off the electrical power supply to the unit and
install lockout tag.
NOTE: A password may be required to change Service Test
values, depending on previous settings configured in the unit.
Default password is “1111.”
Step 4 — Open the heat section access panel.
Step 5 — Move ON/OFF switch on the internal gas valve to the
OFF position.
a. Press the ESCAPE key until a blank screen is shown.
b. Use the arrow keys to scroll the red LED on the display
to the “Service Test” position and press ENTER.
c. The control will display the Field Service Test Mode
(TEST) setting. Press ENTER once to select the TEST
setting for configuration. Press ENTER again for “OFF”
to begin flashing.
Step 6 — Close the heat section access panel.
Step 7 — If unit is being shut down because of a malfunction,
call your dealer as soon as possible.
If unit is being shut down because the heating season has ended,
restore electrical power to the unit to ensure operation of the
cooling system during the cooling season.
d. Use the arrow keys to change the configuration from
“OFF” to “ON,” then press ENTER to save the setting.
Step 2 — Close the shutoff valve on the external gas supply
piping.
Step 3 — Turn off the electrical power supply to the unit and
install lockout tag.
Step 4 — Open the heat section access panel.
Step 5 — Move ON/OFF switch on the internal gas valve to the
OFF position.
Step 6 — Close the heat section access panel.
Step 7 — If unit is being shut down because of a malfunction,
call your dealer as soon as possible. If unit is being shut down
because the heating season has ended, restore electrical power to
the unit to ensure operation of the cooling system during the
cooling season.
6
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MAIN
ON
OFF
UT
-O
CK
LO
TA
G
STEP 2
STEP 3
STEP 1
Single-Stage
RTU gas valve
Two-Stage
RTU gas valve
On/Off
Switch
On/Off
Switch
STEP 4
STEP 5
STEP 7
STEP 6
C08543
Fig. 4 -- To Shut Unit Off (Units with Electro--Mechanical Control)
7
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MAIN
ON
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Alarm Status
Outputs
Configuration
Time Clock
Operating Modes
Alarms
ESCAPE ENTER
OFF
UT
K-O
C
LO
STEP 2
G
TA
STEP 1
STEP 3
Single-Stage
RTU gas valve
Two-Stage
RTU gas valve
On/Off
Switch
On/Off
Switch
STEP 4
STEP 5
STEP 6
STEP 7
C08544
Fig. 5 -- To Shut Unit Off (Units with ComfortLinkt Control)
8
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CONTROL BOX
AND COMPRESSOR
ACCESS DOOR
INDOOR MOTOR
ACCESS DOOR
OUTDOOR AIR
SCREEN
CONDENSER COIL
ACCESS DOOR
GAS SECTION
ACCESS DOOR
FILTER ACCESS DOOR
C08545
Fig. 6 -- Panel and Filter Locations (48PG03--07 Shown)
Air Filter(s)
MAINTAINING YOUR UNIT
Air filters should be checked at least every 3 or 4 weeks and
changed or cleaned whenever they become dirty. Table 1 indicates
the correct filter size for your unit. Open the filter access panel to
replace or inspect the filters. All units have filter tracks into which
the filters slide. Remove the filters by pulling the filter slide
outward from the track. See Fig. 6 for filter access panel location.
Note the direction of flow arrows on the filter frame.
If you have difficulty in locating your air filter in the return--air
duct system, or if you have questions concerning proper filter
maintenance, contact your dealer for instructions. When replacing
your unit filters, always use the correct size and quantity as shown
in Table 1. Filter tracks are field convertible for 2 or 4--in. thick
filters. Verify airflow and duct static values, and related motor
sizing and belt drive adjustment, if filter type or efficiency rating is
changed from the original installation.
All maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
For your safety, keep the area around the unit clear and free of
combustible materials, gasoline and other flammable liquids and
vapors.
To assure proper functioning of the unit, flow of combustion and
ventilating air must not be obstructed from reaching the unit.
Clearance of at least 6 ft on all sides is required.
ROUTINE MAINTENANCE AND CARE
FOR THE EQUIPMENT OWNER
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
!
WARNING
Units with outdoor air capability have cleanable screens for the
outdoor air. These screens should be checked annually and cleaned
as necessary.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
!
WARNING
1.Turn off gas supply and electrical power to your unit before
servicing or performing maintenance.
FIRE AND EQUIPMENT DAMAGE HAZARD
2. Do not turn off electrical power to this unit without first
turning off gas supply and applying lockout tags.
Failure to follow this warning could result in personal injury,
death, and/or property damage.
3. When removing access doors or performing maintenance
functions inside your unit, be aware of sharp sheet metal
parts and screws. Although special care has been taken to
reduce sharp edges to a minimum, be extremely careful
when handling parts or reaching into the unit.
Never operate unit without filters in place. Damage to blower
motor and/or compressors could result. An accumulation of
dust and lint on internal parts of your unit can cause loss of
efficiency and in some cases, fire.
9
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Table 1 – Indoor Air Filter Data
10. When you have completed your inspection, follow the
start--up procedures in this manual to restore your unit to
operation.
UNIT
SIZE
FILTER QUANTITY
FILTER SIZE
4
4
8
11. Observe unit heating operation, and watch the burner flame
with the access panel removed to see if it is bright blue. If
you observe a suspected malfunction, or that the burner
flames are not bright blue, call your dealer. Some yellow
flame may be present due to the panel being removed.
16 x 20 x (2 or 4) in
03---07
08---14
16
(406.4 x 508 x [50.8 or 101.6]) mm
20 x 25 x (2 or 4) in
(508 x 635 x [50.8 or 101.6]) mm
20 x 20 x (2 or 4) in
(508 x 508 x [50.8 or 101.6]) mm
12. Close burner compartment access panel.
Alarm Status
(Units with ComfortLinkt Controls)
Heat Exchanger
To ensure dependable and efficient heating operation, the heat
exchanger should be checked by a qualified maintenance person
before each heating season, and cleaned when necessary. This
checkout should not be attempted by anyone not having the
required expertise and equipment to do the job properly. Checking
and/or cleaning the heat exchanger involves removing the gas
controls assembly and the flue collector box cover and, when
completed, reinstalling the gas controls assembly for proper
operation. The flue collector box cover must be reinstalled with
“red” RTV correctly so that a proper seal is maintained. Contact
your dealer for the required periodic maintenance.
The Scrolling Marquee display incorporates an Alarm Status LED
that turns on to indicate an active alarm or alert. These alarms and
alerts are in addition to those that are indicated by the Integrated
Gas Control (IGC). The ComfortLink control active alarm codes
and alarm history can be viewed with the Scrolling Marquee or
other Carrier Comfort Networkr (CCN) devices. Alarms may also
be configured to broadcast automatically on CCN. If the unit will
not operate and the Alarm Status LED is on, contact the local
dealer and request service.
Integrated Gas Controller (IGC)
Evaporator, Condenser and Combustion Fan
Motors
The indoor fan, outdoor fan, and combustion fan motors have
permanently sealed bearings, so no field lubrication is necessary.
The IGC board incorporates an LED that emits a flashing light to
indicate an alarm code. If the furnace section will not operate and
the LED is flashing a code (1 to 9 flashes in succession), contact
your dealer and request service.
NOTE: Make note of the flash code before powering off the unit.
The alarm codes clear after power cycle.
Indoor Fan, Belt and Pulleys
Check quarterly the condition of the fan wheel(s), pulleys, fan belt
and the belt tension. If there is any loose part or belt wear, contact
your dealer and request service.
Combustion Air and Vent System
The combustion area and vent system should be visually inspected
before each heating season. The normal accumulation of dirt, soot,
rust, and scale can result in loss of efficiency and improper
performance if allowed to build up.
Indoor Fan Shaft Bearings (Sizes 03--14)
The indoor fan has permanently sealed bearings, so no field
lubrication is necessary.
Indoor Fan Shaft Bearings (Size 16)
Lubricate bearings at least every 6 months with suitable bearing
grease. Typical lubricants are given below:
!
WARNING
FIRE HAZARD
MANUFACTURER
Texaco
LUBRICANT
R e g a l A F B --- 2 *
Mobilplex EP No. 1
Prestige 42
Failure to follow this warning could result in personal injury,
death, and/or property damage.
If your unit makes and especially loud noise when the main
burners are ignited, shut down the heating section and call
your dealer.
Mobil
Sunoco
Texaco
Multifak 2
* Preferred lubricant because it contains rust and oxidation inhibitors.
See Fig. 1 and proceed as follows to inspect the combustion area
and power--venting system of your unit.
Refrigerant Circuits
7. Turn off electrical power (install disconnect tag) and gas
supply to your unit (follow Shut--Off Steps 1--3).
8. Open burner compartment access panel.
The refrigerant circuits are difficult to check for leaks without the
proper equipment; therefore, if inadequate cooling is suspected,
contact your dealer for service.
Evaporator and Condenser Coils
9. Using a flashlight, carefully inspect the burner areas for dirt,
soot, or scale.
Cleaning of the coils should only be done by qualified service
personnel. This procedure should be performed prior to cooling
operation or more frequently should conditions require. Contact
your dealer for the required annual maintenance.
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Condensate Drain
Failure to follow this caution may result in damage to unit.
The drain pan and condensate drain line should be checked and
cleaned at the same time the cooling coils are checked by your
dealer.
If dirt, soot, rust or scale accumulations are found, call your
dealer and do not operate your heating section.
10
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Complete Service Instructions can be found in the unit
Installation, Start--Up and Service Instructions.
Compressors
All compressors are factory shipped with a normal charge of the
correct type refrigerant grade oil. No field lubrication is necessary
except possibly with repair or replacement of refrigerant circuit
components.
BEFORE YOU CALL FOR SERVICE,
CHECK FOR SEVERAL EASILY SOLVED
PROBLEMS
Condenser Fan
If insufficient heating or cooling is suspected:
(
)Check for sufficient airflow. Check the air filter for dirt. Check
!
WARNING
for blocked return--air or supply--air grilles. Be sure they are open
and unobstructed. If these checks do not reveal the cause, call your
servicing dealer.
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal injury
or death.
If your unit is not operating at all, check the
following list for easy solutions:
Do not poke sticks, screwdrivers, or other object into
revolving fan blades.
(
) If using a thermostat, check to be sure that your thermostat
temperature selector is set above the indoor temperature during the
heating season, or below the indoor temperature during the cooling
season. Be sure the SYSTEM switch in the proper HEAT or COOL
position and not in the OFF position.
The fan must be kept free of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
(
) If ComfortLink™ controls are used, check Scrolling Marquee
Electrical Controls and Wiring
Electrical controls are difficult to check without proper
instrumentation; therefore, if there are any discrepancies in the
operating cycle, contact your dealer and request service.
to be sure unit is not in SERVICE TEST mode. Check that set
points are properly configured.
(
) If the alarm light is on, check what alarms are active and/or
notify the dealer.
) Is the electrical supply switch on? Are any fuses blown, or has
the circuit breaker tripped?
) During the heating season, check the manual gas shutoff valve.
Unit Panels
(
After performing any maintenance or service on the unit, be sure
all panels are securely fastened in place to prevent rain from
entering unit cabinet and to prevent disruption of the correct unit
airflow pattern.
(
Is this lever parallel with the pipe, indicating that the valve is open?
Or is the lever at the right angle, indicating that the valve is closed?
If closed, has the gas been shut off for safety reasons? Otherwise,
you may open the valve and follow the start--up procedures listed
in this manual.
NOTE: Before proceeding with the next check, turn off the
electrical power supply to the unit.
REGULAR DEALER MAINTENANCE
In addition to the type of routine maintenance you might be willing
to perform, your unit should be inspected regularly by a properly
trained service technician. An inspection (preferably each year, but
at least every other year) should include the following:
1. Inspection of all flue product passages -- including the
burners, combustion baffles, heat exchanger, flue collector
box, and vent pipe.
2. Inspection of all combustion--air and ventilation--air
passages and openings.
(
) During the heating season, check the control dial on the gas
valve. Is it in the ON position? If it is not, be sure it has not been
turned off for the purpose of safety. If nothing else is incorrect,
follow the start--up procedures in this manual.
(
) If your unit still fails to operate, call your servicing dealer for
troubleshooting and repairs. Specify the model and serial numbers
of your unit. (Record them in this manual in the space provided.) If
the dealer knows exactly which unit you have, he may be able to
offer suggestions over the phone, or save valuable time through
knowledgeable preparation for the service call.
3. Close inspection of all gas pipes leading to and inside your
unit.
4. Inspection, and if required, cleaning of the condenser and
evaporator coils.
5. Inspection, and if required, cleaning of the evaporator drain
pan.
IN CASE OF TROUBLE
If, after performing the above, unit performance is unsatisfactory,
shut off the unit and call your dealer.
6. Inspection, cleaning, and lubrication of blower wheel
housing and motor.
Dealer’s Name:
Telephone No.:
Unit Model:
7. Inspection of all supply--air and return--air ducts for leaks,
obstructions, and insulation integrity. Any problems found
should be resolved at this time.
8. Inspection of the unit base to ensure that no cracks, gaps,
etc., exist which may cause a hazardous condition.
Unit Serial Number:
9. Inspection of the unit casing for signs of deterioration.
10. Inspection of all electrical wiring and components to
assure proper connection.
11. Inspection for leaks in the refrigerant circuit.
Pressure--check to determine appropriate refrigerant charge
12. Operational check of the unit to determine working
conditions. Repair or adjustment should be made at this
time.
13. Your servicing dealer may offer an economical service
contract that covers seasonal inspections. Ask for further
details.
11
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HEATING &
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under the
“Heating Equipment” or “Air Conditioning Contractors & Systems” heading for dealer listing by brand name.
Have available the Model No., Series Letter, & Serial No. of your equipment to ensure correct replacement part.
Catalog No: 48PDPG---01SO
Copyright 2008 Carrier Corporation, 7310 W. Morris St. Indianapolis, IN 46231
Printed in the U.S.A.
Edition Date: 9/08
Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.
Replaces: 48PG---5SO
12
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