Table 1 — Indoor-Air Filter Data*
UNIT TYPE OF FILTER QUANTITY...SIZE (in.)
581A
Fiberglass
Throwaway
4...20 x 20 x 2
4...16 x 20 x 2
579F†
Fiberglass
Throwaway
4...20 x 20 x 2
4...16 x 20 x 2
*When replacing filters, always use the same type and size originally
supplied.
†The 579F300 unit requires 2-in. industrial grade filters capable of hand-
ling face velocities of up to 625 ft/min (such as American Air Filter
no. 5700 or equivalent).
II. HEAT EXCHANGER
To ensure dependable and efficient heating operation, the heat
exchanger should be checked by a qualified maintenance per-
son before each heating season, 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 cleaning the heat exchanger involves remov-
ing 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 correctly so that a proper seal is maintained. Con-
tact your dealer for the required periodic maintenance.
III. EVAPORATOR-FAN MOTOR, CONDENSER-FAN MO-
TOR, FAN SHAFT BEARINGS, AND COMBUSTION FAN
MOTOR
Periodically check the condition of fan wheels and housings,
belt tension, and fan motor shaft bearings. No lubrication of
condenser or evaporator fan bearings or motors is required
or recommended for at least 5 years of normal operation.
After 5 years, motor life can be extended by having the mo-
tors serviced at an authorized motor service shop.
IV. 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 technician must be
certain the proper oil level is maintained in the compressor
when it is installed and running.
V. EVAPORATOR AND CONDENSER COILS
Cleaning of the coils should only be done by qualified serv-
ice personnel. Contact your dealer for the required annual
maintenance.
VI. 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.
VII. CONDENSER FAN
WARNING:
Do not poke sticks, screwdrivers, or any
other object into revolving fan blades. Severe bodily in-
jury may result.
The fan must be kept free of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
VIII. ELECTRICAL CONTROLS AND WIRING
Electrical controls are difficult to check without proper in-
strumentation; therefore, if there are any discrepancies in the
operating cycle, contact your dealer and request service.
BURNER ACCESS
PANEL (HIDDEN)
HOOD
(OPTION)
OUTDOOR-AIR
FILTER
RETAINER
OUTDOOR-AIR
FILTERS
MOTORS AND FILTER
ACCESS PANEL
579F180,216 AND 581A155,180
MOTOR AND
FILTER
ACCESS PANEL
HOOD
(OPTION)
BURNER ACCESS
PANEL (HIDDEN)
OUTDOOR-
AIR FILTERS
OUTDOOR-
AIR FILTER
RETAINER
579F240,300 AND 581A240
Fig. 4 — Filter Access Locations
—5—
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