27
Air Filter
The VVCB air filter is field-provided and installed. Follow
these guidelines when selecting and installing the filter.
•
External filter or other means of filtration is required.
•
Filter application and placement are critical to airflow,
which may affect the heating and cooling system
performance. Reduced airflow can shorten the life
of the system’s major components, such as motor,
limits, elements, heat relays, evaporator coil or
compressor. Consequently, we recommend that the
return air duct system have only one filter location.
For systems with a return air filter grille or multiple
filter grilles, can have a filter installed at each of the
return air openings.
•
If adding high efficiency filters or electronic air
filtration systems, it is very important that the air
flow is not reduced. If air flow is reduced the overall
performance and efficiency of the unit will be
reduced.
•
When sizing the return air filter grille, a minimum
surface area of 200 sq. in. per ton is recommended.
Air Filter Removal
1.
Remove screws, remove filter cabinet cover. See
Figure 19.
2.
Remove air filter.
3.
Clean the air filter using vacuum or water. For heavy
accumulations, use soft brush and mild detergent.
See Figure 20.
4.
Dry filter completely before use.
FILTER RAILS
FILTER COVER
MANUAL BOLT
RETURN
AIR OPENING DEPTH
Figure 19. Air Filter Location
Figure 20. Air Filter Cleaning
WARNING
Do not operate the system without filters. A portion of
the dust entrained in the air may temporarily lodge in the
duct runs and at the supply registers. Any circulated dust
particles could be heated and charred by contact with
the air handler elements.
This residue could soil ceilings, walls, drapes, carpets
and other articles in the house.
Soot damage may occur with filters in place, when
certain types of candles, oil lamps or standing pilots are
burned.
Model
Filter Size
Width
Depth
Height
12/18/24/30
18x20 in (457 x 508 mm)
18-1/4 in (464 mm)
21-5/8 in (549 mm)
1 in (25.4 mm)
36/48/54/60
20x22 in (508x559 mm)
20-3/4 in (527 mm)
24 in (610 mm)
1 in (25.4 mm)
IMPORTANT
Do not double filter the return air duct system. Do not
filter the supply air duct system. This will change the
performance of the unit and reduce airflow.
Table 4. Space Allowance for Filter Installation Table
