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66386-YUM-D-0912
AIR FILTERS
All units contain four 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 beginning to
accumulate excessive dirt.
To install the filters, remove the filter access panel as shown
in Figure 4.
FIGURE 4-
FILTER ACCESS
BLOWER ASSEMBLY
Even with good filters properly in place, blower wheels and
motors will become dust laden after many months of opera-
tion. The entire blower assembly should be inspected annu-
ally. 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 fitting until grease
just begins to show at the seals. Do not over lubricate. Use
any lithium base grease recommended for ball bearing ser-
vice.
Johnson Controls Unitary Products
F I L T E R S
I N D O O R C O I L
F I L T E R A C C E S S
P U L L S
NOTE: Filters must be installed with "Air Flow" arrows point-
ing inward -- toward the indoor coil. In the event the
spacers in the filter section are removed, they must
be reinstalled in their original 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.
Perform all maintenance operations on the blower motor
with electric power disconnected from the unit. Do not
attempt to lubricate bearings with the unit in operation.
MOTORS
Outdoor fan motors are permanently lubricated and require
no maintenance.
Ventor motor is factory lubricated for an estimated 10 year
life.
5
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