Dirty Filter Switch Adjustment; Figure 44 Adjusting Filter Switch - Bard MULTI-TEC W42ACE Series Service Instructions Manual

3. With air filters installed and switch initially set at
0.4" W.C. (see Step 2 under Dirty Filter Switch
on page 31), begin restricting the air filter of the
unit 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
Manual 2100-725C
Page 32 of 39
slightly clockwise. If the switch tripped after 75%,
turn the knob counter-clockwise (see Figure 44).
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 44
Adjusting Dirty Filter Switch
MIS-4086 B
TURN CLOCKWISE TO INCREASE
RESTRICTION AMOUNT REQUIRED
TO ACTIVATE THE SWITCH AND
COUNTER-CLOCKWISE TO
DECREASE RESTRICTION AMOUNT