Carrier 48HJ20 28 User Manual

48HG14---28, 48HJ20---28  
48PG20---28, 48PM16---28  
Gas Heating/Electric Cooling Unit  
User’s Information Manual  
NOTE TO INSTALLER:  
!
WARNING  
This manual should be left with the equipment owner.  
TABLE OF CONTENTS  
FIRE, EXPLOSION HAZARD  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1  
DETERMINE TYPE OF UNIT CONTROL . . . . . . . . . . . . . . . 2  
TO LIGHT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2--6  
Units with Thermostat Control . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Units with ComfortLINKt Control . . . . . . . . . . . . . . . . . . . . 3  
TO SHUT UNIT OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6--8  
Units with Thermostat Control . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Units with ComfortLINK Control . . . . . . . . . . . . . . . . . . . . . . 6  
MAINTAINING YOUR UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Failure to follow this warning could result in personal injury,  
death and/or property damage.  
1. Improper installation, adjustment, alteration, service,  
or maintenance can cause property damage, personal  
injury, or loss of life. Refer to the User’s Information  
Manual provided with this unit for more details.  
2. 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.  
4. IMMEDIATELY call your gas supplier from a  
neighbor’s phone. Follow the gas supplier’s  
instructions.  
ROUTINE MAINTENANCE AND CARE FOR  
THE EQUIPMENT OWNER . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
REGULAR DEALER MAINTENANCE . . . . . . . . . . . . . . . . 10  
BEFORE YOU CALL FOR SERVICE, CHECK  
FOR SEVERAL EASILY SOLVED PROBLEMS . . . . . . . . . 11  
5. If you cannot reach your gas supplier, call the fire  
department.  
SAFETY CONSIDERATIONS  
Installation and servicing of air-conditioning equipment can be  
hazardous due to system pressure and electrical components. Only  
trained and qualified service personnel should install, repair, or  
service air-conditioning equipment.  
!
WARNING  
PERSONAL INJURY, DEATH AND / OR PROPERTY  
DAMAGE HAZARD  
Untrained personnel can perform the basic maintenance functions  
of replacing filters. All other operations should be performed by  
trained service personnel. When working on air-conditioning  
equipment, observe precautions in the literature, tags and labels  
attached to the unit, and other safety precautions that may apply.  
Failure to follow this warning could result in personal injury,  
death or property damage.  
Improper installation, adjustment, alteration, service,  
maintenance, or use can cause explosion, 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 service agency must use  
factory--authorized kits or accessories when modifying this  
product.  
Follow all safety codes. Wear safety glasses and work gloves.  
Have fire extinguishers available for all brazing operations.  
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.  
Step 8 — Remove lockout tag and turn on the electrical supply  
to unit.  
!
WARNING  
Step 9 — Open the external gas pipings manual shut off valve  
located outside the unit.  
FIRE, EXPLOSION HAZARD  
Failure to follow this warning could result in personal injury,  
death, and/or property damage.  
Step 10 — Set room thermostat temperature 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 a few seconds of main gas ignition.  
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.  
TO LIGHT UNIT  
(UNITS WITH COMFORTLINK  
CONTROL)  
Step 11 — Set the temperature selector on room thermostat to  
desired setting.  
!
DANGER  
FIRE, EXPLOSION HAZARD  
Failure to follow this warning could result in personal injury,  
death, and/or property damage.  
1. Do not turn off the electrical power to unit without first  
turning off the gas supply and apply lockout tags.  
2. Before attempting to start the gas heating section, familiarize  
yourself with all the procedures that must be followed.  
COMBUSTION  
FAN HOUSING  
HEAT  
INDUCED  
EXCHANGER  
DRAFT  
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.  
SECTION  
MOTOR  
MAIN GAS  
VALVE  
IGC BOARD  
(HIDDEN)  
MAIN BURNER  
SECTION  
C07259  
Fig. 1 -- Typical Gas Heating Section  
3
MAIN  
ON  
OFF  
STEP 1  
STEP 2  
T
U
-O  
K
C
LO  
G
TA  
STEP 3  
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 5  
STEP 4  
STEP 7  
STEP 9  
STEP 8  
STEP 10  
C09513  
Fig. 2 -- To Light Unit  
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  
STEP 2  
T
U
-O  
K
C
LO  
G
TA  
STEP 3  
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 4  
STEP 5  
STEP 6  
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  
C09577  
Fig. 3 -- To Light Unit (Units with ComfortLinkt Control)  
5
TO LIGHT UNIT (UNITS WITH  
COMFORTLINKCONTROL)  
(CONTINUED)  
!
WARNING  
FIRE, EXPLOSION HAZARD  
See Fig. 1 for location of gas valve. Refer to Fig. 3 while  
proceeding with the following steps.  
Failure to follow this warning could result in personal injury,  
death, and/or property damage.  
Step 1 — Turn off the unit demand for cooling or heating by  
using the Scrolling Marquee. The Scrolling Marquee is located in  
the control box at the compressor end of the unit.  
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.  
a. Push the  
shown.  
key until a blank display screen is  
ESCAPE  
TO SHUT UNIT OFF  
(UNITS WITH THERMOSTAT CONTROL)  
b. Push the DOWN arrow key until the SERVICE TEST  
LED is lit.  
!
c. Push the  
d. Push the  
flash.  
key. The display will show TEST.  
key again. The NO/YES display will  
WARNING  
ENTER  
ENTER  
FIRE HAZARD  
Failure to follow this warning could result in personal injury,  
death, and/or property damage.  
e. Push the UP or DOWN key to toggle the display to  
YES and then push . The unit will be locked  
off from heat, cooling or any operation. The controls  
will still function and the display will still operate.  
ENTER  
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 gas valve to the unit before  
shutting off the electrical supply. Make sure to apply lockout  
tags.  
NOTE: A password may be required to change Service Test  
values depending on previous settings configured in the unit.  
Default password is “1111.”  
Step 2 — Close the external gas pipings manual shut off valve  
located outside the unit.  
See Fig. 1 for location of gas valve. Refer to Fig. 4 while  
proceeding with the following steps.  
Step 3 — Turn off the electrical supply to the unit and  
install lockout tag.  
Step 1 — Set room thermostat to lowest temperature setting and  
set SYSTEM switch to OFF position.  
Step 4 — Remove the heat section access panel.  
Step 2 — Close the external gas pipings manual shut off valve  
located outside the unit.  
Step 5 — Turn the Off/On selector switch on the gas valve to  
the OFF position and wait 5 minutes.  
Step 3 — Turn off the electrical power supply to the unit and  
install lockout tag.  
Step 6 — Move the Off/On selector switch on the gas valve to  
the ON position.  
Step 4 — Remove the heat section access panel.  
Step 7 — Replace the heat section access panel.  
Step 5 — Turn the control dial on the main gas valve  
counterclockwise to the OFF position.  
Step 8 — Remove lockout tag and turn on the electrical supply  
to unit.  
Step 6 — Replace the heat section access panel.  
Step 7 — If unit is being shut down because of a malfunction,  
NOTE: Normal operation will automatically begin. Service Test  
mode will automatically end (exit) after a recycle of power.  
Step 9 — Open the external gas pipings manual shut off valve  
call your dealer as soon as possible.  
located outside the unit.  
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.  
Step 10 — Using the Scrolling Marquee, enable the unit to run  
using the following procedure:  
TO SHUT UNIT OFF  
(UNITS WITH COMFORTLINK™  
CONTROL)  
a. Push the  
shown.  
key until a blank display screen is  
ESCAPE  
b. Push the DOWN key until the SERVICE TEST LED is  
lit.  
c. Push the  
d. Push the  
flash.  
key. The display will show TEST.  
key again. The NO/YES display will  
ENTER  
ENTER  
!
WARNING  
FIRE HAZARD  
e. Push the UP or DOWN key to toggle the display to NO  
and then push . The unit will return to normal  
operation and exit SERVICE TEST mode.  
Step 11 — To test the operation of the gas section, use the  
Scrolling Marquee test routine to energize the gas outputs and to  
turn on the gas.  
Failure to follow this warning could result in personal injury,  
death, and/or property damage.  
ENTER  
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 gas valve to the unit before  
shutting off the electrical supply. Make sure to apply lockout  
tags.  
Step 12 — For normal operation, make sure that the set points  
are at the normal heat set points.  
See Fig. 1 for location of gas valve. Refer to Fig. 5 while  
proceeding with the following steps.  
6
MAIN  
ON  
OFF  
STEP 1  
STEP 2  
T
U
-O  
K
C
LO  
G
TA  
STEP 3  
CONTROL I.D.  
LABEL  
SWITCH (SHIPPED IN  
“ON” POSITION)  
1/4˝ X .032˝ MALE SPADE  
TERMINALS (2) COMMON  
STEP 5  
STEP 4  
STEP 6  
STEP 7  
C09578  
Fig. 4 -- To Shut Unit Off  
NOTE: A password may be required to change Service Test  
values depending on previous settings configured in the unit.  
Default password is “1111.”  
Step 1 — Turn off the unit demand for cooling or heating by  
using the Scrolling Marquee. The Scrolling Marquee is located in  
the control box at the compressor end of the unit.  
Step 2 — Close the external gas pipings manual shut off valve  
located outside the unit.  
a. Push the  
shown.  
key until a blank display screen is  
ESCAPE  
b. Push the DOWN arrow key until the SERVICE TEST  
LED is lit.  
Step 3 — Turn off the electrical power supply to the unit and  
install lockout tag.  
c. Push the  
key. The display will show TEST.  
key again. The NO/YES display will  
ENTER  
ENTER  
Step 4 — Remove the heat section access panel.  
Step 5 — Turn the control dial on the main gas valve  
d. Push the  
flash.  
counterclockwise to the OFF position.  
e. Push the UP or DOWN key to toggle the display to  
YES and then push . The unit will be locked  
off from heat, cooling or any operation. The controls  
will still function and the display will still operate.  
ENTER  
Step 6 — Replace the heat section access panel.  
Step 7 — If unit is being shut down because of a malfunction,  
call your dealer as soon as possible.  
7
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  
STEP 2  
T
U
-O  
K
C
LO  
G
A
T
STEP 3  
CONTROL I.D.  
LABEL  
SWITCH (SHIPPED IN  
“ON” POSITION)  
1/4˝ X .032˝ MALE SPADE  
TERMINALS (2) COMMON  
STEP 5  
STEP 4  
STEP 7  
STEP 6  
C09579  
Fig. 5 -- To Shut Unit Off (Units with ComfortLinkt Control)  
If unit is being shut down because the heating season has ended,  
restore electrical power to the unit and take control out of Service  
Test mode to ensure operation of the cooling system during the  
cooling season.  
MAINTAINING YOUR UNIT  
All maintenance should be handled by skilled, experienced  
personnel. Your dealer can help you establish  
procedure.  
a
standard  
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.  
8
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  
FIRE, EXPLOSION HAZARD  
Failure to follow this warning could result in personal injury,  
death, and/or property damage.  
1.Turn off gas supply and electrical power to your unit before  
servicing or performing maintenance.  
PULL OUT CENTER OF  
HOOD TO RELEASE OUTDOOR AIR  
FILTER FROM TRACK  
2. Do not turn off electrical power to this unit without first  
turning off gas supply and apply lockout tags.  
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.  
INDOOR MOTOR  
ACCESS DOOR  
CONTROL BOX  
ACCESS DOOR  
Air Filter(s)  
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 same size and type of filter that was  
originally supplied by the installer. 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.  
FILTER  
ACCESS  
DOOR  
HEAT  
SECTION  
ACCESS  
PANEL  
GAS VALVE  
CONNECTION  
C07352  
Fig. 6 -- Panel and Filter Locations  
Units with outdoor air capability have cleanable filters for the  
outdoor air. These filters should be checked quarterly and cleaned  
as necessary. Remove by pulling out the middle of the hood top.  
Push up on the center filter and then remove. Slide the other filters  
to the center and repeat.  
Alarm Status  
(Units with ComfortLinkt Controls)  
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.  
!
WARNING  
FIRE AND EQUIPMENT DAMAGE HAZARD  
Failure to follow this warning could result in personal injury,  
death, and/or property damage.  
Integrated Gas Controller (IGC)  
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.  
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. (See Fig. 1.)  
NOTE: Make note of the flash code before powering off the unit.  
The alarm codes clear after power cycle.  
Table 1 – Indoor Air Filter Data  
UNIT  
QUANTITY...SIZE  
48HG,HJ,  
TYPE OF FILTER  
(in.)  
PG, PM  
014---024  
Standard Throwaway, Optional  
30%, or Accessory 65% Pleated  
9...16 x 25 x 2  
9...20 x 25 x 2  
a n d 1 6 --- 2 4  
Standard Throwaway, Optional  
028 and 28  
30%, or Accessory 65% Pleated  
9
Combustion Area and Vent System  
Fan Shaft Bearings  
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.  
Lubrication should only be done by qualified service personnel.  
Contact your dealer for the required annual maintenance.  
Refrigerant Circuits  
The refrigerant circuits are difficult to check for leaks without the  
proper equipment; therefore, if inadequate cooling is suspected,  
contact your dealer for service.  
!
WARNING  
Evaporator and Condenser Coils  
FIRE HAZARD  
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.  
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.  
Condensate Drain  
The drain pan and condensate drain line should be checked and  
cleaned at the same time the cooling coils are checked by your  
dealer.  
See Fig. 1 and proceed as follows to inspect the combustion area  
and power--venting system of your unit.  
Compressors  
1. Turn off electrical power (install disconnect tag) and gas  
supply to your unit (follow Shut Off steps 1--3).  
2. Remove burner compartment access panel.  
All compressors are factory shipped with a normal charge of the  
correct type refrigerant grade oil in them and should rarely require  
additional oil. Unless the refrigerant system has been opened or a  
compressor is replaced, there will not be a need to verify oil level.  
3. Using a flashlight, carefully inspect the burner areas for dirt,  
soot, or scale.  
Condenser Fan  
!
CAUTION  
!
WARNING  
EQUIPMENT DAMAGE HAZARD  
PERSONAL INJURY HAZARD  
Failure to follow this caution may result in damage to unit.  
Failure to follow this warning could result in personal injury  
or death.  
If dirt, soot, rust or scale accumulations are found, call your  
dealer and do not operate your heating section.  
Do not poke sticks, screwdrivers, or other object into  
revolving fan blades.  
4. When you have completed your inspection, follow the  
start--up procedures in this manual to restore your unit to  
operation.  
The fan must be kept free of all obstructions to ensure proper  
cooling. Contact your dealer for any required service.  
5. 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.  
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.  
6. Replace burner compartment access panel.  
Unit Panels  
Heat Exchanger  
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.  
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 replaced and sealed  
correctly using high temperature “red” RTV. Contact your dealer  
for the required periodic maintenance.  
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.  
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.  
Evaporator, Condenser, and Combustion Fan  
Motors  
Lubrication is not recommended. Bearings will not require  
lubrication for at least 5 years of normal operation. After 5 years,  
motor life can be extended by having the motors serviced at an  
authorized motor service shop.  
Fans and Belts  
Check quarterly the condition of fan wheels and housings, and belt  
tension. When service is necessary, call your dealer.  
5. Inspection, and if required, cleaning of the evaporator drain  
pan.  
6. Inspection, cleaning, and lubrication of blower wheel  
housing and motor.  
10  
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.  
(
) 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.  
(
8. Inspection of the unit base to ensure that no cracks, gaps,  
etc., exist which may cause a hazardous condition.  
9. Inspection of the unit casing for signs of deterioration.  
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.  
10. Inspection of all electrical wiring and components to  
assure proper connection.  
NOTE: Before proceeding with the next check, turn off the  
electrical power supply to the unit. Remove the control access  
door.  
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.  
(
) 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.  
13. Your servicing dealer may offer an economical service  
contract that covers seasonal inspections. Ask for further  
details.  
(
) 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.  
Complete Service Instructions can be found in the unit  
Installation, Start--Up and Service Instructions.  
BEFORE YOU CALL FOR SERVICE,  
CHECK FOR SEVERAL EASILY SOLVED  
PROBLEMS  
IN CASE OF TROUBLE  
If, after performing the above, unit performance is unsatisfactory,  
shut off the unit and call your dealer.  
Dealer’s Name:  
Telephone No.:  
Unit Model:  
If insufficient heating or cooling is suspected:  
(
)Check for sufficient airflow. Check the air filter for dirt. Check  
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.  
Unit Serial Number:  
If your unit is not operating at all, check the  
following list for easy solutions:  
(
) 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.  
(
) If ComfortLinkcontrols are used, check Scrolling Marquee  
to be sure unit is not in SERVICE TEST mode. Check that set  
points are properly configured. If alarm light is on, check what  
alarms are active and/or notify the dealer.  
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.  
C a t a l o g N o : 4 8 H --- P --- 0 3 S O  
Copyright 2009 Carrier Corp., 7310 W. Morris St. Indianapolis, IN 46231  
Printed in the U.S.A.  
Edition Date: 11/09  
Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.  
R e p l a ce s: 4 8 H --- P --- 2 SO  
11  

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