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The W43A Humidistat controls humidifying and/or
dehumidifying equipment. Typical uses include the
control 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 hp motors. It
has a wide setpoint 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.
Human Hair Sensing Element
1/4 hp (6A) Rated Contacts
High/Low Adjustable Knob
Range Stops
Enclosed Pennswitch
Mounting Plate
© 2018 Johnson Controls
Part No. 24-8466-1, Rev. A
Code No. LIT-125715
W43A Humidistat
Figure 1: W43A Humidistat with Vertical Faceplate
Features and Benefits
Provides stable, accurate measurement
Permits direct operation of many fans in
commercial applications
Allows adjustments within a desired range
Provides dust protection for contacts
Allows easy mounting and wiring without
removing the cover
Master Catalog 125
Humidity Controls Section W
Product/Technical Bulletin W43A
Issue Date 0918
1
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Related Manuals for Johnson Controls PENN W43A14
Summary of Contents for Johnson Controls PENN W43A14
- Page 1 Allows adjustments within a desired range Range Stops Enclosed Pennswitch Provides dust protection for contacts Mounting Plate Allows easy mounting and wiring without removing the cover © 2018 Johnson Controls Part No. 24-8466-1, Rev. A Code No. LIT-125715...
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Page 2: Location Considerations
ntroduction Table 1: Humidity Settings Outside Temperature Suggested Humidity IMPORTANT: The W43A Humidistat is designed for Setting use only as an operating control. Where an operating control failure ° ° F (-29 C) and Below 15% RH would result in personal injury and/or loss of property, it is the responsibility °... -
Page 3: Mounting And Wiring
Dimensions 6-32 Mounting Screws (2 Places) 0.69 1.20 1.59 3.22 2.34 4.71 0.80 2.96 1.28 0.25 1.27 1.41 Figure 2: W43A Dimensions (in./mm) Mounting and Wiring Mounting Plate Grounding Locking Screw Screw Adjustment Knob Wall Mounting Plate Vertical Faceplate Optional Cover Concealed Locking Screw... -
Page 4: Wiring Diagrams
IMPORTANT: Do not remove the humidistat cover ptional Horizontal Faceplate Installation during installation. The sensing element must be carefully protected 1. Mount and wire the humidistat according to the against accidental damage. All wiring steps outlined in the Installation section. and mounting can be completed without removing the cover. - Page 5 Humidistat 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. Humidifier High Range Stop 1. Set the adjustment knob to the maximum desired Figure 6: Humidification Control Wiring Diagram RH setting.
- Page 6 Field repairs must not be made except for replacement of the adjustment knob or mounting plate. Refer to Table 4: Replacement Parts for replacement part ordering information. For a replacement W43A, contact the nearest Johnson Controls representative. 6 W43A Humidistat Product/Technical Bulletin...
- Page 7 rdering Information Table 2: Ordering Information Item Product Code Number Humidistat W43A-14C ccessories Brand Name Faceplates Brand name faceplates are available on quantity orders. Contact Customer Service. Humidistat Guards Plastic, wire, or cast aluminum guards are available at extra cost. See the GRD Series in the Johnson Controls HVAC/Refrigeration Controls Catalog.
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Page 8: Specifications
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls shall not be liable for damages resulting from misapplication or misuse of its products.