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using a piece of cardboard under the filters until
the switch trips and the light comes on. If the
filter is restricted by 75% (or desired restriction
amount), skip to Step 6.
4. If switch setting adjustment is required,
disconnect power to the unit. Remove the upper
front panel and the cover on the airflow switch so
that adjustment can be made. If the switch tripped
before 75% restriction was reached, turn the knob
slightly clockwise. If the switch tripped after 75%,
turn the knob counter-clockwise (see Figure 30).
Dirty Filter Switch
Manual 2100-720E
Page
36 of 42
Dirty Filter Switch and Dirty Filter Indicator Light/Reset Switch
5. Replace the upper front panel and repeat Steps
1-3. Continue to make adjustments described in
Step 4 until the desired restriction is obtained.
6. Remove the restriction and reset the filter switch.
Replace the switch cover once adjustment is
complete.
7. Install the outer control panel cover. This
completes the adjustment.
FIGURE 29
Dirty Filter Indicator Light
and Reset Swtitch
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