Carrier Heating System 06 User Manual

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  
 
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
 
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
 
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
 
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
 
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
 
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
 
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
 
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  
 
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 ComfortLinkcontrols 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  
 
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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