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The W43A Humidistat
The W43A Humidistat controls humidifying and/or
dehumidifying equipment. Typical uses include the controls of humidity by
ventilation, air conditioning, humidifiers, and dehumidifiers in residential,
commercial, and industrial installations.
The W43A has Single-Pole/Double-Throw (SPDT)
snap-acting contacts rated to switch 1/4 motors. It has a wide set point
range of 0 to 70% Relative Humidity (RH), as well as "off" dial positions for
humidification and dehumidification. The differential of the W43A is fixed
at approximately 6% RH.
Features & Benefits:
- Human Hair Sensing Element Provides stable,
accurate measurement
- 1/4 HP (6 amp) Rated Contacts Permits direct
operation of many fans in commercial applications
- High/Low adjustable knob range stops allows
for adjustments within a desired range
- Enclosed pennswitch provides dust protection
for contacts
- Mounting plate allows easy mounting and
wiring without removing the cover
The W43A Humidstat provides SPDT control for
use on low or line voltage applications. It has a thermoplastic cover with
Allen-head locking screw to discourage unauthorized tampering. The sensing
element consists of a carefully selected and processed human hair.
An adjusting knob and easy-to-read dial allow
quick selection of the desired set point. The humidistat is supplied with
the faceplate installed for vertical mounting and knob adjustment.
However, a horizontal faceplate is enclosed for horizontal mounting and knob
adjustment if desired.
The humidistat has a set point range of 0 to
70% RH, as well as humidification off (HUM OFF) and dehumidification off (DEH
OFF) positions. At the HUM OFF position, the C to L terminal circuit is
open and the C to H terminal circuit is closed.
At the DEH Off position, the C to H terminal
circuit is open and the C to L terminal controls the humidification equipment.
At any given set point, the C to L circuit
closes on a decrease in relative humidity, and the C to H circuit closes on an
increase in relative humidity.
The usual setting in winter is 30 to 40% RH.
Lower settings may be necessary in extremely cold weather to prevent
condensation on windows, door, etc. The same setting should be used where
reduction of humidity by means of exhaust fans is provided in well-constructed
homes. Summer settings on air conditioning or dehumidifying equipment will
usually be near 50% RH.
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