Carrier 48DJE - Manual (Page 5)

FILTER ACCESS PANEL
FILTER ACCESS DOOR
48DJD.DJE
Fig. 4 — Filter Access Door/Panel Location
48LJD,LJE
Heat Exchanger — To ensure dependable and effi­
cient heating operation, the heat exchanger should be checked
by a qualified maintenance person before each heating sea­
son, 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 clean­
ing the heat exchanger involves removing the gas controls
assembly 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.
Fans, Belts, and Fan Motor — Periodically check
the condition of the fan wheels and housings, belt tension
and fan motor shaft bearings. No lubrication of condenser
or evaporator fan bearings or motors is required or recom­
mended.
Evaporator and Condenser Coils — Cleaning of
the coils should be done by qualified service personnel. Con­
tact your dealer for the required annual maintenance.
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 of refrigeration-
grade oil in them and should not require additional oil.
Condenser Fan
A WARNING
Do not poke sticks, screwdrivers, or any other object
into revolving fan blades. Severe bodily injury may re­
sult.
The fan must be kept free of all obstructions to ensure
proper cooling. Contact your dealer for any required ser­
vice.
Electrical Controls and Wiring — Electrical con­
trols are difficult to check without proper instrumentation;
therefore, if there are any discrepancies in the operating cy­
cle, contact your dealer and request service.
Refrigerant Circuit — The refrigerant circuit is dif­
ficult to check for leaks without the proper equipment; there­
fore, if inadequate cooling is suspected, contact your local
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
improper performance if allowed to build up.
A CAUTION
If your unit makes any unusual or especially loud noises
during heating, shut down the heating section and call
your dealer.
See Fig. 4 and 5 and proceed as follows to inspect the
combustion area and power-venting system of your unit.
1. Turn off gas supply to your unit.
2. Turn off electrical power to your unit.
3. Remove burner compartment access panel.
4. Using a flashlight, carefully inspect the burner areas for
dirt, soot, rust or scale.
A CAUTION
If dirt, soot, rust, or scale accumulations are found,
call your dealer and do not operate your heating
section.
5. When you have completed your inspection, follow the
start-up procedures in this manual to restore your unit to
operation.
Observe unit heating operation.
A WARNING
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 that the burner flame is
not bright blue, call your dealer.
7. Replace burner compartment access panel.
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.