035-19047-002-A-1103
Unitary Products Group
5
AIR FILTERS
All units contain four (4) 20” x 25” x 2" filters. The filter
racks on these units will receive either 1" or 2" filters.
Filters can also be installed in the building at a suitable
return air location if an economizer or outside air
accessory is not used. Filters must always be used.
They should be inspected once a month and thor-
oughly cleaned or replaced if it appears they are begin-
ning to accumulate excessive dirt.
To install the filters, remove the filter access panel as
shown in Figure 4.
NOTE:
Filters must be installed with “Air Flow” arrows
pointing inward -- toward the indoor coil. In the
event the spacers in the filter section are
removed, they must be reinstalled in their origi-
nal position.
Slide filters all the way into the filter racks provided.
When more than one filter in a filter rack is required,
they must butt each other when sliding into position.
Replace the filter access panel.
BLOWER ASSEMBLY
Even with good filters properly in place, blower wheels
and motors will become dust laden after many months
of operation. The entire blower assembly should be
inspected annually. If the motor and wheel are heavily
coated with dust, they can be brushed and cleaned
with a vacuum cleaner.
These units are supplied with blower shaft bearings
that do not require maintenance but may be lubricated
if desired. Every three years, using a low pressure
grease gun, pump grease into the bearing grease fit-
ting until grease just begins to show at the seals. Do
not over lubricate. Use any lithium base grease recom-
mended for ball bearing service.
FIGURE 4-
FILTER ACCESS
I N D O O R C O I L
F I L T E R S
F I L T E R A C C E S S
P U L L S
