6
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 5/16-- in.
nut driver.
2. Remove the filter(s) by pu lling it out and through the unit
duct ope ning. If filter is dirty, replace both filters with new
ones.
When installing the new filters, note the di rection 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
30-040/060
2each20x12x1
(508 x 305 x 25 mm)
36-060/090
2each20x12x1
(508 x 305 x 25 mm)
42-060/090
1 each 24 x 14 x 1 (610 x 356 x 25 mm),
24 x 16 x 1 (610 x 406 x 25 mm)
48-090/115/130
1 each 24 x 14 x 1 (610 x 356 x 25 mm),
24 x 16 x 1 (610 x 406 x 25 mm)
60-090/115/130*
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.
RETURN
DUCT COVER
(Remove for
lter access)
SMALL CHASSIS
A10063
Fig. 5 -- Sma ll Chassis Filter Access
Large Chassis (See Fig. 6)
1. Remove filter access door using a 5/16-- in. nut driver.
2. Remove the filter(s) by pu lling 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 th en in stall 24 x 16x1(610x406x25)filter.
When installing the new filters, note the di rection 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.
UNIT OPERATION HAZARD
Failure to follow thi s cautio n may result in property
damage.
Never operate your unit without filters in place. An
accumulation of du st and lint on internal parts of your unit
can cause loss of efficiency and blower motor and/ or
compressor damage.
!
CAUTION
LARGE CHASSIS
FILTER
ACCESS
PANEL
A10062
Fig. 6 -- Large Ch assis 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.
