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.
REGULAR DEALER MAINTENANCE
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:
1. Inspection of all flue product passages — including the
burners, heat exchanger, and flue collector box.
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 outdoor and
indoor coils.
5. Inspection and, if required, cleaning of the indoor drain
pan.
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.
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.
11. Inspection for leaks in the refrigerant circuit. Pressure-
check to determine appropriate refrigerant charge.
12. Inspection of compressor oil level.
13. Operational check of the unit to determine working con-
ditions. Repair or adjustment should be made at this time.
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.
WARRANTY
The 48HX warranty is located at the back of this book. Be
sure to read the warranty carefully to determine the cover-
age for your unit.
BEFORE YOU CALL FOR SERVICE,
CHECK FOR SEVERAL EASILY-SOLVED
PROBLEMS
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 re-
veal 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 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.
(
) 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.
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.
(
) 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.
(
) 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 and unit performance is still
unsatisfactory, shut off the unit and call your dealer.
Dealer’s Name
Telephone
Unit Model
Unit Serial Number
FILTER ACCESS PANEL
Fig. 6 — Filter Access Panel — Vertical Supply Shown
8
