Submittal Sheet

ManualsBrandsHoneywell ManualsHVAC Controls1-1/2" x 4" Sail Switch, SPST

Table Of Contents

PRODUCT DATA

60-2186—2

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).

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Specifications ................................................................... 1

Ordering Information ........................................................ 2

Installation ........................................................................ 3

Wiring ............................................................................... 3

Checkout .......................................................................... 3

Summary of content (4 pages)

PAGE 1
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. • Sail can be trimmed to one-half the original size to double the velocity required to close the snap switch contacts.
PAGE 2
S437A,B, S637A SAIL SWITCHES MODEL NO. INCLUDES CASE AND COVER S437A YES S437B NO S637A SWITCHING ACTION ON INCREASING VELOCITY SWITCHING ACTION ON DECREASING VELOCITY SWITCH DIFFERENTIAL Spst. Normally open contacts Switch de-energizes at close at 1900-2250 fpm 1350 fpm (6.9 m/s). Not (9.7 - 11.4 m/s). Varies adjustable. directly with differential setting. Spst. One set of contacts opens, one set closes at 1900-2250 fpm (9.7 - 11.4 m/s).
PAGE 3
S437A,B, S637A SAIL SWITCHES INSTALLATION S637A When Installing this Product... 1. 2. 3. 4. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained, experienced service technician. After installation is complete, check out product operation as provided in these instructions.
PAGE 4
S437A,B, S637A SAIL SWITCHES Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2007 Honeywell International Inc. 60-2186—2 J.I. Rev.