1.TURNOFFGASSUPPLYANDELECTRICALPOWER
TOYOURUNITBEFORESERVICINGORPERFORM-
INGMAINTENANCE.
2.Donotturnoff"electricalpowertothisunitwithoutfirst
turningoff"thegassupply.
3.Whenremovingaccesspanelsorperformingmaintenance
functionsinsideyourunit,beawareofsharpsheetmetal
partsandscrews.Althoughspecialcareistakentoreduce
sharpedgestoaminimum,beextremelycarefulwhen
handlingpartsorreachingintotheunit.
Failuretofollowtheseinstructionsmayresultin serious
iniuryordeath.
AIR FILTERS Air filter(s) should be checked at least every 3
or 4 weeks and changed or cleaned whenever it becomes 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 Ibr your unit. Refer to Fig. 3 to access the
filter(s).
To replace or inspect filter(s) (or accessory filter rack when
supplied):
i. Remove the filter access panel using a 5/16-in. nut driver.
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
an'ows on the filter frame.
If you have difficulty in locating your air filter(s), or if you have
questions concerning proper filter maintenance, contact your
dealer for instructions. When replacing filters, ahvays use the same
size and type of filter that was supplied originally by the installer.
m.l["_talliilI']/]
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 canse loss of efficiency and, in
SOiIle cases, fire.
Table I--Indoor-Air Filter Data
UNIT SIZE FILTER SIZE
48GP024-030 20x20
48GP036 20x24
48GP042-060 24x30
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 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 con'ectly so that a proper seal is maintained.
Contact your dealer for the required periodic maintenance.
FANS AND FAN MOTOR Periodically check the condition of
fan wheels and housings and _an-motor shaft bearings. No lubri-
cation of condenser- or evaporator@an bearings or motors is
reqnired or recommended.
EVAPORATOR AND CONDENSER COILS Cleaning of the
coils should only be done by qualified service personnel. Contact
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 _actory-shipped with a
normal charge of the correct type refrigeration grade oil in them
and should rarely require additional oil.
CONDENSER FAN
[q'_lli ,lTI
ACCESS PANEL
FILTER ACCESS
PANEL*
*For accessory filter rack.
Fig. 3--Filter Access Panel--
Vertical Supply Shown
The fan must be kept fi'ee of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
ELECTRICAL CONTROLS AND WIRING Electrical con-
trols are difficult to check without proper instrumentations; there-
fore, if there are any discrepancies in the operating cycle, contact
your dealer and request service.
REFRIGERANT CIRCUIT The refrigerant circuit is difficult
to check for leaks without the proper equipment; therefore, if
inadequate cooling is suspected, contact your local dealer for
service.
COMBUSTION AREA AND VENT SYSTEM The combus-
tion 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 improper perfunnance if
allowed to build up.
If your unit makes an especially loud noise when the main
burners are ignited, shut down the heating section and call
your dealer.
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