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Humidistat
L
H
C
L
120
VAC
N
Figure 6: Humidification Control Wiring Diagram
Humidistat
L
H
C
L
120
VAC
N
Figure 7: Schematic Wiring Diagram of a W43A
Automatically Operating a Humidifier or Dehumidifier
as Selected by Manual Changeover Switch
Fan Speed Selector
Humidistat
with Manual "On/Off"
L
H
C
L
120
VAC
N
Figure 8: Schematic Wiring Diagram of a W43A
Automatically Operating an Exhaust Fan at Full
Speed to Control Excessive Humidity; a Combination
Speed Control and "On/Off" Switch Permits Manual
Operation of Exhaust Fan at Selected Speeds
Humidifier
Manual
Changeover
Humidifier
Switch
Dehumidifier
Exhaust
Fan
Motor
Switch
R
ange Stops
High and low range stops of the humidistat can be field
adjusted as desired. Use the following procedures to
set the high and low range stops.
High Range Stop
1. Set the adjustment knob to the maximum desired
RH setting.
2. Pull the adjustment knob off the humidistat cover.
3. Loosen the bottom cover screw and remove the
humidistat cover.
!
CAUTION: Equipment damage hazard.
Avoid contact with human hair
sensing element. Contact with
hair element can affect control
accuracy and/or product life.
4. While holding the dial firmly in place, keeping the
setting in line with the calibrating mark, depress
the tab "A" (see Figure 9) and rotate it
counterclockwise until it is against the stop pin "C".
5. Release the tab making sure it fits into the nearest
notch.
6. Replace the humidistat cover, tighten the bottom
cover screw, and replace the adjustment knob.
7. Rotate adjustment knob to desired normal
operating setpoint.
Low Range Stop
1. Set the adjustment knob to the minimum desired
RH setting.
2. Pull the adjustment knob off the humidistat cover.
3. Loosen the bottom cover screw and remove the
humidistat cover.
W43A Humidistat Product/Technical Bulletin
5
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