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Switching Filter Sizes
To switch from 1" to 2" filters, remove the filter slide
and bend the tabs down out of the way to accommodate
the 2" filter (see Figures 9 and 10).
FIGURE 9
Filter Tabs in Up Position
FIGURE 10
Bend Filter Tabs Down
Fresh Air Intake
This unit may be equipped with a fresh air damper
assembly. The damper blade is locked in the closed
position when the unit is shipped from the factory. To
allow the damper to operate, remove the two plastic
locking pins, one on each end of the blade. This will
allow for maximum fresh airflow. The damper blade will
now open when the indoor blower is operating. If less
than maximum fresh airflow is required, re-insert the
plastic pins to limit damper blade opening to desired
level. Two extra pins are provided (taped to the inside
of the assembly) which may be used to hold the blade
in some position other than minimum or maximum
position. This fresh air assembly is located in the
rear of the unit and to gain access to make these
adjustments remove the air filter service door.
All capacity, efficiency and cost of operation
information as required for Department of Energy
"Energyguide" Fact Sheets are based upon the fresh
air blank-off plate in place and is recommended for
maximum energy efficiency.
The blank-off plate is available upon request from the
factory and is installed in place of the fresh air damper
shipped with each unit.
Vent Options
Barometric Fresh Air Damper (Standard)
Before starting, make sure the power has been turned
off. The return air grille panel must be removed. The
fresh air damper assembly can be seen on the back of
the unit (see Figure 11).
1. The fresh air damper is attached to the back of the
unit with one screw on either side of the assembly.
Both of the screws must be removed.
2. Once the mounting screws are removed, tilt the
assembly down and lift it out.
The mist eliminator can be seen through the opening.
The mist eliminator must be raised up and the bottom
can be pulled toward the front of the unit and removed.
FIGURE 11
Fresh Air Damper Assembly
MOUNTING SCREWS
MIS-4182
Manual 2100-752B
Page
9 of 49
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Troubleshooting
