Carrier Gas Heater 48GS User Manual

48GS,GX  
Combination Gas Heating/  
Electric Cooling Units  
A Guide To Operating and Maintaining Your  
Gas Heating/Electric Cooling Unit  
NOTE TO INSTALLER  
FOR YOUR SAFETY  
This manual should be left with the equipment owner.  
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 sup-  
plier’s instructions.  
FOR YOUR SAFETY  
Do not store or use gasoline or other  
flammable vapors and liquids in the vicin-  
ity of this or any other appliance.  
• If you cannot reach your gas supplier,  
call the fire department.  
Improper installation, adjustment, alteration, serv-  
ice or maintenance can cause injury or prop-  
erty damage. Refer to this manual. For assistance  
or additional information, consult a qualified in-  
staller, service agency, or the gas supplier.  
Before performing recommended maintenance,  
be sure gas supply and main power switch to  
unit are turned off. Electrical shock could cause  
personal injury.  
Model 48GS with Standard Wire Grille  
Model 48GX with Optional Louvered Grille  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1 PC 111 Catalog No. 534-742 Printed in U.S.A. Form 48GS,GX-1SO Pg 1 3-99 Replaces: 48GS-1SO  
Tab 1a 6a  
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ROUTINE MAINTENANCE  
All routine maintenance should be handled by skilled, ex-  
perienced personnel. Your dealer can help you establish a  
standard procedure.  
For your safety, keep the unit area clear and free of com-  
bustible materials, gasoline, and other flammable liquids and  
vapors.  
Never operate your unit without filters in place. Failure  
to heed this warning may result in damage to the blower  
motor and/or compressor. An accumulation of dust and  
lint on internal parts of your unit can cause loss of ef-  
ficiency and, in some cases, fire.  
To assure proper functioning of the unit, flow of combus-  
tion and ventilating air must not be obstructed from reaching  
the unit. Clearance of at least 30 in. is required on all sides  
except the duct side.  
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 properly do the job. Checking and/or cleaning  
the heat exchanger involves removing the gas controls as-  
sembly and the flue collector box cover and, when com-  
pleted, reinstalling the gas controls assembly for proper op-  
eration. Also, the flue collector box cover must be replaced  
correctly so that a proper seal is maintained. Contact your  
dealer for the required periodic maintenance.  
MAINTENANCE AND CARE FOR THE  
EQUIPMENT OWNER  
Before proceeding with those things you might want to  
maintain yourself, please carefully consider the following:  
Fans and Fan Motor — Periodically check the con-  
dition of fan wheels and housings and fan-motor shaft  
bearings. No lubrication of condenser- or evaporator-fan  
bearings or motors is required or recommended.  
1. TURN OFF GAS SUPPLY AND ELECTRICAL  
POWER TO YOUR UNIT BEFORE SERVICING  
OR PERFORMING MAINTENANCE.  
Evaporator and Condenser Coils — Cleaning of  
the coils should only be done by qualified service per-  
sonnel. Contact your dealer for the required annual  
maintenance.  
2. Do not turn off electrical power to this unit without  
first turning off the gas supply.  
3. When removing access panels or performing main-  
tenance functions inside your unit, be aware of sharp  
sheet metal parts and screws. Although special care  
is taken to reduce sharp edges to a minimum, be ex-  
tremely careful when handling parts or reaching into  
the unit.  
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.  
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  
person must be certain the proper oil level is maintained in  
the compressor when it is installed and running.  
Air Filters — Air filter(s) should be checked at least ev-  
ery 3 or 4 weeks and changed or cleaned whenever it be-  
comes dirty. Dirty filters produce excessive stress on the blower  
motor and can cause the motor to overheat and shut down.  
Table 1 indicates the correct filter size for your unit. Refer  
to Fig. 5 to access the filter(s).  
To replace or inspect filter(s) (or accessory filter rack when  
supplied):  
1. Remove the filter access panel using a 516-in. nut driver.  
Condenser Fan  
Do not poke sticks, screwdrivers, or any other object  
into revolving fan blades. Severe bodily injury may  
result.  
The fan must be kept free of all obstructions to en-  
sure proper cooling. Contact your dealer for any required  
service.  
2. Remove the filter(s) by pulling the filter(s) out of the unit.  
If the filter(s) is dirty, clean or replace with new one.  
When installing the new filter(s), note the direction of the  
airflow arrows on the filter frame.  
If you have difficulty in locating your air filter(s), or if  
you have questions concerning proper filter maintenance, con-  
tact your dealer for instructions. When replacing filters, al-  
ways use the same size and type of filter that was supplied  
originally by the installer.  
Table 1 — Indoor-Air Filter Data*  
UNIT SIZE  
48GS018-030  
48GS036-042  
48GS048-060  
48GX024-030  
48GX036  
FILTER SIZE  
20x20  
20x24  
24x30  
20x20  
20x24  
48GX042-060  
24x30  
*For filter grille installations only.  
Fig. 2 — Gas Heating/Electric Cooling Unit  
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STEP 1  
STEP 2  
STEP 3  
STEP 4  
STEP 5  
STEP 7  
STEP 6  
STEP 10  
STEP 9  
STEP 8  
Fig. 3 — To Light Unit  
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STEP 1  
STEP 2  
STEP 3  
STEP 5  
STEP 4  
STEP 6  
STEP 7  
Fig. 4 — To Shut Unit Off  
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Components in heat section may be hot after unit  
has been started up. When observing flame, be care-  
ful not to get close to or touch heating components  
or serious personal injury may result.  
Watch the burner flame to see if it is bright blue. If you  
observe a suspected malfunction or if the burner flames  
are not bright blue, call your dealer.  
6. Replace burner access panel.  
Unit Panels — After performing any maintenance or serv-  
ice on the unit, be sure all panels are fastened securely in  
place to prevent rain from entering unit cabinet and to pre-  
vent disruption of the correct unit airflow pattern.  
ACCESS PANEL  
FILTER ACCESS  
PANEL*  
REGULAR DEALER MAINTENANCE  
*For accessory filter rack.  
In addition to the type of routine maintenance you might  
be willing to perform, your unit should be inspected regu-  
larly by a properly trained service technician. An inspection  
(preferably each year, but at least every other year) should  
include the following:  
Fig. 5 — Filter Access Panel — Vertical Supply Shown  
1. Inspection of all flue product passages — including the  
burners, heat exchanger, and flue collector box.  
Electrical Controls and Wiring — Electrical con-  
trols are difficult to check without proper instrumentation;  
therefore, if there are any discrepancies in the operating cycle,  
contact your dealer and request service.  
2. Inspection of all combustion- and ventilation-air pas-  
sages and openings.  
3. Close inspection of all gas pipes leading to and inside of  
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.  
Refrigerant Circuit — The refrigerant circuit is diffi-  
cult to check for leaks without the proper equipment; there-  
fore, if inadequate cooling is suspected, contact your local  
dealer for service.  
6. Inspection and cleaning of blower wheel housing and  
motor.  
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.  
Combustion Area and Vent System — The com-  
bustion area and vent system should be inspected visually  
before each heating season. The normal accumulation of dirt,  
soot, rust, and scale can result in loss of efficiency and im-  
proper performance if allowed to build up.  
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.  
10. Inspection of all electrical wiring and components to as-  
sure proper connection.  
If your unit makes an especially loud noise when the  
main burners are ignited, shut down the heating section  
and call your dealer.  
11. Inspection for leaks in the refrigerant circuit. Pressure-  
check to determine appropriate refrigerant charge.  
12. Inspection of compressor oil level.  
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 access panel. (See Fig. 1.)  
13. Operational check of the unit to determine working con-  
ditions. Repair or adjustment should be made at this time.  
3. Using a flashlight, carefully inspect the burner areas for  
dirt, soot, rust, or scale. See Fig. 2.  
Your servicing dealer may offer an economical service con-  
tract that covers seasonal inspections. Ask for further  
details.  
Complete service instructions can be found in the unit  
Installation, Start-Up and Service Instructions.  
If dirt, soot, rust, or scale accumulations are found,  
call your dealer and do not operate your heating sec-  
tion.  
4. When you have completed your inspection, follow the  
start-up procedures in this manual to restore your unit to  
operation.  
WARRANTIES  
Units 48GS and GX have warranties located at the back  
of this book. Be sure to read the warranty carefully to de-  
termine the coverage for your unit.  
5. Observe unit heating operation.  
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BEFORE YOU CALL FOR SERVICE,  
CHECK FOR SEVERAL EASILY-SOLVED  
PROBLEMS  
NOTE: Before proceeding with the next check, turn OFF  
the gas supply, then the electrical power supply to the unit.  
Remove the control access door.  
If insufficient heating or cooling is suspected:  
(
) During the heating season, check the control dial on the  
internal gas valve. Is it in the ON position? If it is not, be  
sure it was not turned off for the purpose of safety. If no  
safety hazards exist, follow the start-up procedures in this  
manual.  
(
) 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 re-  
veal the cause, call your servicing dealer.  
(
) 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.  
If your unit is not operating at all, check the following list  
for easy solutions:  
(
) Check to be sure that your thermostat temperature se-  
lector 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.  
IN CASE OF TROUBLE  
If after performing the above and unit performance is still  
unsatisfactory, shut off the unit and call your dealer.  
(
) Is the electrical supply switch ON? Are any fuses blown,  
or has the circuit breaker tripped?  
(
) During the heating season, check the external 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 reasons? Otherwise, you may open the  
valve and follow the start-up procedures listed in this manual.  
Dealer’s Name  
Telephone  
Unit Model  
Unit Serial Number  
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MODEL 48GS WARRANTY  
11  
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MODEL 48GX WARRANTY  
Copyright 1999 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1 PC 111 Catalog No. 534-742 Printed in U.S.A. Form 48GS,GX-1SO Pg 12 3-99 Replaces: 48GS-1SO  
Tab 1a 6a  
4
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