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6. Install the right 2" filter first followed by the left
filter (see Figures 9 and 10).
NOTE: When installing new filters, make sure that
airflow arrows on filters point up.
7. Reverse the steps above to switch from 2" to 1"
filters.
FIGURE 9
Install Right 2" Filter
FIGURE 10
Install Left 2" Filter
Fresh Air Intake
All units are built with fresh air inlet louvers punched
in the side grilles.
If the unit is equipped with a fresh air damper assembly,
the assembly is shipped already attached to the unit.
The damper blade is locked in the closed position. To
allow the damper to operate, remove the two (2) screws
in the bottom of the blade (see Figure 11). Remove right
side grille to access the damper blade.
FIGURE 11
Fresh Air Damper
LOSED
Blade is screwed closed for
OVE (2)
NTAKE
shipping. Remove two (2)
ATION.
screws for fresh air intake
during unit operation.
There is an adjustable slide on the side of the fresh air
intake that can be adjusted to limit how far the damper
opens so that the amount of fresh air that enters the
structure is regulated.
Graphs found on pages 41 and 42 gives approximate
fresh air amounts based on the slide adjustment
setting.
All capacity, efficiency and cost of operation
information is based upon the fresh air blank-off plate
in place.
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.
Condensate Drain
A clear, flexible PVC drain hose (3/4" ID, 1" OD)
extends from the drain pan at the top of the unit down
to the unit base. There are openings in the unit base for
the drain hose to pass through. In the event the drain
hose is connected to a drain system of some type, it
must be an open or vented type system to assure proper
drainage.
MIS-3977
Manual 2100-720E
Page
7 of 42
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