S437A,B, S637A
Sail Switches
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 ...................................................................
Installation ........................................................................
Wiring ...............................................................................
Checkout ..........................................................................
PRODUCT DATA
Contents
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60-2186—2
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