Carrier COMFORTLINK 48A2 User's Manual | Page 7

Carrier Air Compressor User's Manual - COMFORTLINK 48A2.
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6. Observe unit heating operation. Watch the burner flame

to see if it is bright blue. If you observe a suspected mal-

function or if the flame is not bright blue, call your dealer.

7. Replace gas section access panels.

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, heat exchanger, and flue collector box.

2. Inspection of all combustion 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.

5. Inspection and if required, cleaning of the condensate

drain pan.

6. Inspection and cleaning of blower wheel housing and

motor.

7. Inspection of all supply and return-air ducts for leaks, ob-

structions, and insulation integrity. Any problems found

should be resolved at the time of inspection.

8. Inspection of the unit base for cracks, gaps, etc., 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

ensure proper connection.

11. Inspection for leaks in the refrigerant circuit. Pressure-

check to determine appropriate refrigerant charge.

12. Inspection of fan wheels and housings, belt tension, and

fan motor shaft bearings.

13. Operational check of the unit to determine working

conditions. Repair or adjustment should be made at the

time of inspection.

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

Controls, Start-Up, Operation, Service and Troubleshooting

literature.

BEFORE YOU CALL FOR SERVICE,

CHECK FOR PROBLEMS

THAT CAN BE EASILY SOLVED

If insufficient heating or cooling is suspected:
(

) 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:
( ) If using a thermostat, check to be sure that your thermo-

stat temperature set point is above the indoor temperature dur-

ing the heating season, or below the indoor temperature during

the cooling season. Be sure the thermostat mode is in the

proper AUTO, HEAT, or COOL mode and not in the OFF

mode.
( ) Check scrolling marquee to be sure unit is not in Service

Test mode and that unit has not been disabled. Check set points

are properly set.
( ) 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 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. Remove the gas section

access panels.
( ) During the heating season, check the switch 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 no safety hazards

are present, 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.

IN CASE OF TROUBLE

If, after performing the above checks, unit performance is

unsatisfactory, shut off the unit and call your dealer.
Dealer’s Name _____________________________________
Telephone No. _____________________________________
Unit Model _______________________________________
Unit Serial Number _________________________________

WARNING

Components in heat section may be hot after unit has been

started. When observing flame, be careful not to get close

to or touch heating components. Serious personal injury

may result.

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