Dirty Filter Switch And Relay; Economizer Fail Time Delay Relay - Bard HA4S4KA Installation Instructions Manual

DIRTY FILTER SWITCH AND RELAY

These units include an adjustable dirty filter indicator
switch. This switch if connected to normally closed
contacts on the filter relay wired to terminals 10 and
11 on the low voltage terminal block.
Filter Replacement Procedure
For units not equipped with economizer:
1. Turn off unit power.
2. Remove filter door.
3. Replace filter.
4. Press Reset button.
5. Verify filter light is off.
6. Replace filter door.
7. Turn on unit power.
For units equipped with economizer:
1. Turn off unit power.
2. Remove hood cover.
3. Remove mist eliminator. Inspect and clean if
necessary.
4. Remove filter door.
5. Remove and replace filter.
6. Replace filter door.
7. Replace mist eliminator.
8. Replace hood cover.
9. Turn on unit power.
Filter Switch Adjustment
1. Turn off unit power.
2. Remove upper front door. Front screws on unit top
can be removed for ease of removing upper front
door.
3. Locate filter switch on control panel side next to
blower assembly.
4. Remove single phillips head screw on front of
cover. Remove cover.
5. Set pressure by adjusting knob. Do not adjust
knob drastically to avoid nuisance alarm signalw or
non-functionality.
6. Replace cover.
7. Replace upper front door.
8. Turn on unit power.

ECONOMIZER FAIL TIME DELAY RELAY

NOTE: Applies only to units with economizers.
These units employ a time delay relay to open the
nomally closed contacts at terminals 12 and 13 on the
low voltage terminal block. This will activate an alarm
signal on the MV Series controller. The time delay is set
to 500 seconds as a factory default. Avoid adjustment
to settings lower than 180 seconds.
Timer to be set here
(500 seconds)
MIS-3054
MIS-3054
Manual 2100-646
Page 13 of 26