Honeywell S437A, S437B, S637A Product Data
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.
• 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.
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.
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
60-2186—2
S437A,B, S637A SAIL SWITCHES
MODEL
NO.
INCLUDES CASE
AND COVER
SWITCHING ACTION
ON INCREASING
VELOCITY
S437A YES Spst. Normally open contacts
close at 1900-2250 fpm
S437B NO
(9.7 - 11.4 m/s). Varies
directly with differential
setting.
Spst. One set of contacts
opens, one set closes at
S637A YES
1900-2250 fpm
(9.7 - 11.4 m/s). Varies
directly with differential
setting
Maximum Ambient Temperature:150° F (66° C).
Insertion Length: Standard - 3 1/2 in.(89 mm).
Large - 4 1/2 in. (114 mm).
Switch Contact Rating (amperes):
120 Vac 240 Vac
Full Load 8 5.1
Locked Rotor 48 30.6
2 A at 24 Vac.
15 A at 6 Vac.
7.5 A at 12 Vdc.
Cover Finish: Red enamel.
Underwriters Laboratories Inc. Listed:
S437A, S637A - File No. MP2169, Vol. 2 dated
5-11-59; Guide No. MFHX.
S437B - File No. MP2168, Vo. 2 dated
5-11-59; Guide No. MFHX2 (Component Recognized).
Canadian Standards Association Certification: Listed S,
File No. LR95329, Class 481302.
SWITCHING ACTION
ON DECREASING
Switch de-energizes at
1350 fpm (6.9 m/s). Not
adjustable.
One set of contacts opens
to de-energize blower, one
set closes to energize
warming circuit at 1350 fpm
(6.9 m/s). Not adjustable.
WITH CASE AND COVER
1/4
(6)
3-3/4 (95)
7/16 (11)
1-7/16
2-5/16
(37)
(59)
7/16 (11)
7/8
(22)
WITHOUT CASE AND COVER
7/32
3/32
(6)
(17)
(30)
7/32
(2)
1-7/16
(37)
7/32
(6)
(6)
1
11/16
1-13/16
VELOCITY
1-5/32
3-1/4 (83)
2-1/8
(54)
2-1/4 (70)
2-1/8
(54)
INSERTION LENGTH:
STANDARD – 3-1/2 (89)
LARGE – 4-1/2 (114)
7/8
(22)
DUCT OPENING
15/16
15/16
DUCT OPENING
3/32 (2)
(24)
(24)
(29)
3/16 IN. MOUNTING
HOLES (2)
1-7/8
(48)
SWITCH
DIFFERENTIAL
Adjustable,
550-900 fpm
(2.8 - 4.6 m/s)
KNOCKOUT FOR 1/2
(13) INCH CONDUIT
7/8
(22)
INSERTION
LENGTH
1-5/8
(41)
INSERTION
LENGTH
1
M27086
Fig. 1. S437 Dimensions in in. [mm in Brackets].
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
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
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
60-2186—2 2
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