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S437A,B, S637A
Sail Switches
APPLICATION
The S437 and S637 Sail Switches respond to the air velocity
in heating or warm air ducts, such as used in farm crop dryers.
The switch completes a 24 V or line voltage burner control
circuit only when the blower or fan has produced a
predetermined air velocity.
FEATURES
• Micro Switch snap switch is operated by metal sail
inserted in an air stream. (S437 switch is spst, S637
switch is spdt.)
• S637 has a set of normally closed contacts which can
be used to energize a signal or warming circuit when
the velocity drops off.
• Sail can be trimmed to one-half the original size to
double the velocity required to close the snap switch
contacts.
• Switch differential can be manually adjusted by
turning a knurled knob on the snap switch.
• A conduit knockout is located on each end of the case
for wiring convenience.
SPECIFICATIONS
Mounting Position: Velocity characteristics listed apply when
standard size sail is inserted in a horizontal air stream with
the sail pivot in a vertical position. Vertical mounting with air
movement upward is satisfactory; however, characteristics
will change. Device cannot be vertically mounted with
downward air movement.
Mounting Means: Case screw-mounts to duct wall with sail
inserted through wall into air stream.
Mounting Dimensions: Refer to Fig 1.
Sail Size: Standard - 1 x 3 in. (25 x 76 mm).
Large - 1 1/2 x 4 in. (38 x 102 mm).
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Wiring ...............................................................................
Checkout ..........................................................................
PRODUCT DATA
Contents
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3
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60-2186—2
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Summary of Contents for Honeywell S437A
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Page 1: Specifications
S437A,B, S637A Sail Switches PRODUCT DATA FEATURES • Micro Switch snap switch is operated by metal sail inserted in an air stream. (S437 switch is spst, S637 switch is spdt.) • S637 has a set of normally closed contacts which can be used to energize a signal or warming circuit when the velocity drops off. -
Page 2: Ordering Information
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care... - Page 3 S437A,B, S637A SAIL SWITCHES INSTALLATION S637A When Installing this Product... 1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. 2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.
- Page 4 S437A,B, S637A SAIL SWITCHES By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of your use or modification to, the literature. You will defend and indemnify Honeywell, its affiliates and subsidiaries, from and against any liability, cost, or damages, including attorneys’...