Carrier 48TM020 User Manual

48TM016-028  
Combination  
Heating/Cooling Units  
User’s Information Manual  
NOTE TO INSTALLER  
TO LIGHT UNIT  
This manual should be left with the equipment owner.  
1. Do not turn off the electrical power to unit without  
first turning off the gas supply.  
2. Before attempting to start the gas heating section,  
familiarize yourself with all the procedures that must  
be followed.  
WARNING: If the information in this man-  
ual is not followed exactly, a fire or explo-  
sion may result causing property dam-  
age, personal injury or loss of life.  
3. Never attempt to manually light the pilot on unit with  
a match, lighter, or any other flame. If the electric  
sparking device fails to light the pilot, refer to the  
shutdown procedures, then call your dealer as soon as  
possible.  
If you do not follow these instructions exactly, a fire or  
explosion may result, causing property damage, injury, or  
loss of life.  
— 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  
• Do not try to light any appliance.  
• Do not touch any electrical switch;  
do not use any phone in your  
building.  
• Immediately call your gas supplier  
from a neighbor’s phone. Follow the  
gas supplier’s instructions.  
See Fig. 1 for location of gas valves. Refer to Fig. 2 while  
proceeding with the following steps.  
Step 1 — Set room thermostat to the lowest temperature  
setting and set SYSTEM switch to HEAT position.  
• If you cannot reach your gas sup-  
plier, call the fire department.  
Step 2 — Close the external manual gas valve.  
— Installation and service must be per-  
formed by a qualified installer, service  
agency or the gas supplier.  
Step 3 — Turn off the electrical supply to the unit.  
Step 4 — Remove the burner compartment access panel.  
Step 5 — Turn the control dial on the internal gas  
valve counterclockwise  
5 minutes.  
to the OFF position and wait  
Improper installation, adjustment, alteration, ser-  
vice or maintenance can cause injury or property  
damage. Refer to this manual. For assistance or  
additional information consult a qualified installer,  
service agency, or the gas supplier.  
Step 6 — Turn control dial on internal gas valve clock-  
wise to ON position.  
Step 7 — Replace the burner compartment access panel.  
Step 8 — Turn on the electrical supply to unit.  
Step 9 — Open the external gas valve.  
Step 10 — Set room thermostat selector slightly above  
room temperature to start unit. The induced-draft combustion  
air fan will start. Main burners light within 30 seconds. Indoor  
blower will start within a few minutes of main gas ignition.  
Before performing recommended maintenance, be sure  
main power switch to unit is turned off and lockout tag is  
installed. Electrical shock could cause personal injury.  
Your combination heating/cooling unit is equipped with an  
automatic intermittent pilot and induced draft power combus-  
tion blower.  
Step 11 — Set the temperature selector on room thermostat  
to desired setting.  
Pilot will light automatically. Do not attempt to light by  
hand; personal injury may result.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
PC 111 Catalog No. 534-80112 Printed in U.S.A. Form 48TM-1SO Pg 1 5-02 Replaces: New  
Book 1  
4
Tab 1a 6a  
STEP 1  
STEP 2  
STEP 3  
STEP 4  
STEP 5  
STEP 7  
STEP 6  
STEP 9  
STEP 10  
STEP 8  
Fig. 2 — To Light Unit  
3
STEP 1  
STEP 3  
STEP 2  
STEP 4  
STEP 5  
STEP 6  
STEP 7  
Fig. 3 — To Shut Unit Off  
4
seal is maintained. Contact your dealer for the required period-  
ic maintenance.  
BURNER ACCESS  
PANEL (HIDDEN)  
HOOD  
(OPTION)  
Fans and Belts — Periodically check the condition of  
fan wheels and housings, and belt tension. When service is nec-  
essary, call your dealer.  
Evaporator-, Condenser-, and Combustion  
Fan Motors — Lubrication is not recommended. Bearings  
will not require lubrication for at least 5 years of normal opera-  
tion. After 5 years, motor life can be extended by having the  
motors serviced at an authorized motor service shop.  
Fan Shaft Bearings — Lubrication is not recommend-  
OUTDOOR-AIR  
FILTER  
RETAINER  
ed. When service is necessary, call your dealer.  
Evaporator and Condenser Coils — Cleaning of the  
coils should only be done by qualified service personnel. Con-  
tact your dealer for the required annual maintenance.  
OUTDOOR-AIR  
FILTERS  
MOTORS AND FILTER  
ACCESS PANEL  
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.  
48TM016, 020  
HOOD  
(OPTION)  
BURNER ACCESS  
PANEL (HIDDEN)  
Compressor — All compressors are factory shipped with  
a normal charge of the correct type refrigeration grade oil in  
them and should rarely require additional oil. The service tech-  
nician must be certain the proper oil level is maintained in the  
compressor when it is installed and running.  
Condenser Fan  
Do not poke sticks, screwdrivers, or any other object into  
revolving fan blades. Severe bodily injury may result.  
MOTOR AND  
FILTER  
ACCESS PANEL  
OUTDOOR-  
AIR FILTER  
RETAINER  
The fan must be kept free of all obstructions to ensure  
proper cooling. Contact your dealer for any required service.  
OUTDOOR-  
AIR FILTERS  
48TM025  
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.  
HOOD  
(OPTION)  
BURNER ACCESS  
PANEL (HIDDEN)  
Integrated Gas Controller (IGC) — 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 (2 to 8 flashes in succession), contact your  
dealer and request service. See Fig. 1.  
Refrigerant Circuit — The refrigerant circuit is difficult  
to check for leaks without the proper equipment; therefore, if  
inadequate cooling is suspected, contact your dealer for service.  
Combustion Area and Vent System — The com-  
bustion 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 improp-  
er performance if allowed to build up.  
OUTDOOR-  
AIR FILTER  
RETAINER  
OUTDOOR-  
AIR FILTERS  
MOTOR AND FILTER  
ACCESS PANEL  
48TM028  
Fig. 4 — Panel Locations  
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 attempt-  
ed 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. Also, the flue  
collector box cover must be replaced correctly so that a proper  
If your unit makes an especially loud noise when the main  
burners are ignited, shut down the heating section and call  
your dealer.  
See Fig. 1 and proceed as follows to inspect the combustion  
area and power-venting system of your unit.  
1. Turn off electrical power and gas supply to your unit.  
2. Remove burner compartment access panel.  
5
3. Using a flashlight, carefully inspect the burner areas for  
dirt, soot, rust, or scale.  
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 con-  
ditions. 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.  
If dirt, soot, rust, or scale accumulations are found, call  
your dealer and do not operate your heating section.  
4. When you have completed your inspection, follow the  
start-up procedures in this manual to restore your unit to  
operation.  
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. See  
Fig. 5. Some yellow flame may be present due to the pan-  
el being removed.  
Complete Service Instructions can be found in the unit  
Installation, Start-Up and Service Instructions literature.  
BEFORE YOU CALL FOR SERVICE  
CHECK FOR SEVERAL EASILY SOLVED  
PROBLEMS  
If insufficient heating or cooling is suspected:  
6. Replace burner compartment access panel.  
(
) Check for sufficient airflow. Check the air filter for dirt.  
Check for blocked return- or supply-air grilles. Be sure they  
are open and unobstructed. If these checks do not reveal the  
cause, call your servicing dealer.  
If your unit is not operating at all, check the following list  
for easy solutions:  
(
) 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 is in the proper HEAT or COOL  
position and not in the OFF position.  
Fig. 5 — Proper Flame Appearance  
( ) Is the electrical supply switch ON? Are any fuses blown,  
or has the circuit breaker tripped?  
( ) During the heating season, check the manual shutoff valve.  
Is this lever parallel with the pipe, indicating that the valve is  
open? Or is the lever at a right angle, indicating that the valve  
is closed? If closed, has the gas been shut off for safety rea-  
sons? 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. Remove the control access  
door.  
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.  
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 collec-  
tor box, and vent pipe.  
2. Inspection of all combustion- and ventilation-air passages  
and openings.  
3. Close inspection of all gas pipes leading to and inside  
your unit.  
(
) 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 seems  
to be amiss, 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.  
4. Inspection, and if required, cleaning of the condenser and  
evaporator coils.  
5. Inspection, and if required, cleaning of the evaporator  
drain pan.  
6. Inspection, cleaning, and lubrication of blower wheel  
housing and motor.  
7. Inspection of all supply- and return-air ducts for leaks,  
obstructions, and insulation integrity. Any problems  
found should be resolved at this time.  
IN CASE OF TROUBLE  
If, after performing the above, unit performance is unsatis-  
factory, shut off the unit and call your dealer.  
Dealer’s Name _____________________________________  
Telephone No. _____________________________________  
Unit Model ________________________________________  
Unit Serial Number _________________________________  
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.  
6
Copyright 2002 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
PC 111 Catalog No. 534-80112 Printed in U.S.A. Form 48TM-1SO Pg 8 5-02 Replaces: New  
Book 1  
4
Tab 1a 6a  

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