Replacing or inspecting filters in units with econom- izers
Small Chassis (See Fig. 5)
1.Remove return air duct cover at rear of unit using a
2.Remove the filter(s) by pulling it out and through the unit duct opening. If filter is dirty, replace both filters with new ones.
When installing the new filters, note the direction of the airflow arrows on the filter frame, which should be pointing at the indoor coil.
3. Reinstall duct cover ensuring opening is air and watertight.
Table 2 – Indoor Air Filter Data with Economizer
|
| |
Unit Size | Filter Size | |
2 each 20 x 12 x 1 | ||
(508 x 305 x 25 mm) | ||
| ||
2 each 20 x 12 x 1 | ||
(508 x 305 x 25 mm) | ||
| ||
1 each 24 x 14 x 1 (610 x 356 x 25 mm), | ||
24 x 16 x 1 (610 x 406 x 25 mm) | ||
| ||
1 each 24 x 14 x 1 (610 x 356 x 25 mm), | ||
24 x 16 x 1 (610 x 406 x 25 mm) | ||
| ||
1 each 24 x 16 x 1 (610 x 406 x 25 mm), | ||
24 x 18 x 1 (610 x 457 x 25 mm) | ||
|
*Units with bent indoor coil.
!CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in property damage.
Never operate your unit without filters in place. An accumulation of dust and lint on internal parts of your unit can cause loss of efficiency and blower motor and/or compressor damage.
FILTER |
ACCESS |
PANEL |
RETURN
DUCT COVER 
(Remove for 
filter access)
SMALL CHASSIS
A10063
Fig. 5 - Small Chassis Filter Access Large Chassis (See Fig. 6)
1.Remove filter access door using a
2.Remove the filter(s) by pulling it out and through the unit filter access door. If filter is dirty, replace both filters with new ones.
Units with bent indoor coils, install 24 x 18 x 1 (610 x 457 x 25 mm) filter first and then install 24 x 16 x 1 (610 x 406 x 25) filter.
When installing the new filters, note the direction of the airflow arrows on the filter frame, which should be pointing at the indoor coil.
3.Reinstall filter access door ensuring opening is air and water tight.
LARGE CHASSIS
A10062
Fig. 6 - Large Chassis Filter Access
Fans and Fan Motors
Periodically check the condition of fan wheels and housings and fan motor shaft bearings. Contact your dealer for the required annual maintenance.
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. Contact your dealer for the required periodic maintenance.
Indoor and Outdoor 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 factory shipped with a normal charge of the correct type of refrigeration grade oil. A compressor should rarely require additional oil.
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