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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
© 1995 Johnson Controls, Inc.
Part No. 24-8466-1, Rev. —
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 1095
1
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Summary of Contents for Johnson Controls W43A
- Page 1 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. Figure 1: W43A Humidistat with Vertical Faceplate Features and Benefits...
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Page 2: Supplies Needed
° Above 20 F (-7 40% RH or Higher as Desired The W43A Humidistat provides SPDT control for use on low or line voltage applications. It has a nstallation thermoplastic cover with Allen-head locking screw to discourage unauthorized tampering. The sensing... -
Page 3: Mounting And Wiring
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... -
Page 4: Iring Diagrams
Hall Figure 3), and lifting and removing the plate from the base. Figure 4: Typical Wiring Diagram of a W43A Used to 4. Pull wires through the mounting plate and fasten Reduce Excessive Humidity in a Well-Constructed the plate, grounding screw end up, to the wall box Building by Manual or Automatic Control with the screws provided. - Page 5 4. While holding the dial firmly in place, keeping the Figure 7: Schematic Wiring Diagram of a W43A setting in line with the calibrating mark, depress Automatically Operating a Humidifier or Dehumidifier the tab “A”...
- Page 6 After all necessary adjustments and electrical connections have been made, put the system into Figure 9: W43A Humidistat Range Tabs and Stop operation and observe at least three complete operating cycles before leaving the installation.
- Page 7 Item Product Code Number Concealed Adjustment Faceplate, Vertical Mounting PLT333-12R Concealed Adjustment Faceplate, Horizontal Mounting PLT333-9R eplacement Parts Table 4: Replacement Parts Item Product Code Number Thermoplastic Push On Adjustment Knob KNB26A-600R Humidistat Mounting Plate PLT51A-602R W43A Humidistat Product/Technical Bulletin...
- Page 8 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, Inc. shall not be liable for damages resulting from misapplication or misuse of its products.