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W43A Humidistat Product/Technical Bulletin     7

O

rdering Information

Table 2:  Ordering Information

Item

Product Code Number

Humidistat

W43A-14C

A

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

.

Concealed Adjustment Faceplates

Concealed adjustment faceplates are available on
factory order at no extra cost.  For field changeover,
use the concealed faceplate kit and install directly over
the faceplate on the cover.  See Table 3 for ordering
information.

Table 3:  Optional Accessories

Item

Product Code Number

Concealed Adjustment Faceplate, Vertical Mounting

PLT333-12R

Concealed Adjustment Faceplate, Horizontal Mounting

PLT333-9R

R

eplacement Parts

Table 4:  Replacement Parts

Item

Product Code Number

Thermoplastic Push On Adjustment Knob

KNB26A-600R

Humidistat Mounting Plate

PLT51A-602R

Summary of Contents for W43A

Page 1: ...ng 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 Figure 1 W43A Humidistat with Vertical Faceplate Features and Benefits Human Hair Sensing Element Provides stable accurate measurement 1 4 hp 6A Rated Contacts Permits...

Page 2: ...uit is open and the C to L terminal controls the humidification equipment At any given setpoint 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 doors etc The same setting should be used...

Page 3: ...1 27 32 0 25 6 1 59 40 4 71 120 2 34 59 3 22 82 1 20 30 1 41 36 0 80 20 Figure 2 W43A Dimensions in mm Mounting and Wiring Optional Concealed Adjustment Faceplate Adjustment Knob Mounting Plate Locking Screw Vertical Faceplate Mounting Plate Wall Box Cover Locking Screw Grounding Screw Figure 3 W43A Humidistat ...

Page 4: ... back of the humidistat See Wiring Diagrams section Note Use the terminal screws furnished 8 32 x 1 4 in binder head Substitution of other screws may cause problems in making proper connections 6 Connect the grounding provision of the humidistat to the branch circuit ground 7 Hook the two slots in the humidistat base over the projections on the mounting plate and swing the humidistat into place Pu...

Page 5: ...ures 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...

Page 6: ...e 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 and rotate it counterclockwise until it is against the stop C Depress the tab B an...

Page 7: ...ontrols Catalog Concealed Adjustment Faceplates Concealed adjustment faceplates are available on factory order at no extra cost For field changeover use the concealed faceplate kit and install directly over the faceplate on the cover See Table 3 for ordering information Table 3 Optional Accessories Item Product Code Number Concealed Adjustment Faceplate Vertical Mounting PLT333 12R Concealed Adjus...

Page 8: ...odized Aluminum Mounting Vertical or Horizontal 2 x 4 in 51 x 102 mm Wall Box Wiring Terminals Large 8 32 x 1 4 in Binder Head Screws Minimum Ambient Temperature 40 4 4 C Maximum Ambient Temperature 100 F 38 C Agency Listings UL Guide No XAPX File E6688 CSA Class No 4813 02 File LR948 Dimensions H x W x D 4 71 x 2 96 x 2 94 in 120 x 75 x 75 mm Shipping Weight 0 9 lb 0 4 kg The performance specific...

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