Filter
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All installations and services must be performed by qualified service personnel.
D. Supply/Return Air Blower
Check in the blower compartment for dust, dirt, debris, and for the presence of
insects. Remove any foreign material. Clean the blower wheel, housing, and
compartment of dust and lint with a vacuum.
The blower motor has sealed bearings that are permanently lubricated. The blower
motor bearings do not require oil or any type of additional lubrication.
E. Supply/Return Air Filter
A permanent-type air filter is provided in the return section of this unit. This filter
should be inspected regularly. When the filter is dirty, it should be cleaned or
replaced to assure proper heating/cooling system operation. Follow the cleaning,
removal and replacement procedure below.
1. Filter maintenance procedure
The filter rack is located behind an access panel on the left-hand side of the
unit, refer to Figure 12. Shut off the electrical power to the unit. Remove the
screws retaining the access panel to the housing. Remove the access panel.
Slide the dirty air filter out of the filter rack. Clean the filter by either
vacuuming, rinsing with tap water, hosing, or dipping in an ordinary detergent
solution. After cleaning and drying the filter, replace the completely dry filter in
the rack. If the filter has a supporting mesh, the mesh side of the filter must be
placed towards the furnace.
Figure 12: Location of the OPB Supply/Return Air Filter
2. Filter replacement
To ensure an adequate replacement filter is selected, should the filter require
replacing, refer to Table 4, in Air Filters section of this manual, for the
minimum filter areas required for different types of available filters.
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