Honeywell S437A Operation manual

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

S437A,B, S637A SAIL SWITCHES
60-2186—2 2
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.
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):
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.
Fig. 1. S437 Dimensions in in. [mm in Brackets].
MODEL
NO.
INCLUDES CASE
AND COVER
SWITCHING ACTION
ON INCREASING
VELOCITY
SWITCHING ACTION
ON DECREASING
VELOCITY
SWITCH
DIFFERENTIAL
S437A YES Spst. Normally open contacts
close at 1900-2250 fpm
(9.7 - 11.4 m/s). Varies
directly with differential
setting.
Switch de-energizes at
1350 fpm (6.9 m/s). Not
adjustable.
Adjustable,
550-900 fpm
(2.8 - 4.6 m/s)
S437B NO
S637A YES
Spst. One set of contacts
opens, one set closes at
1900-2250 fpm
(9.7 - 11.4 m/s). Varies
directly with differential
setting
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.
120 Vac 240 Vac
Full Load 8 5.1
Locked Rotor 48 30.6
7/8
(22)
7/8
(22)
2-1/8
(54)
3-1/4 (83)
3-3/4 (95)
WITH CASE AND COVER
WITHOUT CASE AND COVER
3/16 IN. MOUNTING
HOLES (2)
INSERTION
LENGTH
1-5/32
(29) 7/8
(22)
DUCT OPENING
1/4
(6)
7/16 (11)
1-7/16
(37)
7/16 (11)
2-5/16
(59)
2-1/4 (70)
2-1/8
(54)
7/32
(6)
7/32
(6)
1-7/16
(37)
7/32
(6) 3/32
(2) 3/32 (2)
15/16
(24)
15/16
(24)
INSERTION
LENGTH
1-13/16
(30)
11/16
(17)
KNOCKOUT FOR 1/2
(13) INCH CONDUIT
1INSERTION LENGTH:
STANDARD – 3-1/2 (89)
LARGE – 4-1/2 (114)
DUCT OPENING
1
1-5/8
(41)
1-7/8
(48)
M27086

S437A,B, S637A SAIL SWITCHES
360-2186—2
INSTALLATION
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.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Disconnect power supply before connecting wiring
to prevent electrical shock and equipment damage.
Mounting
Plan the location so that the sail will be in the direct path of an
unrestricted air stream. A horizontal duct run is best because
the sail will then move horizontally. In a vertical duct, the effect
of gravity on the linkage changes the operating characteristics
somewhat.
1. At the desired location, cut a rectangle hole 1-1/2 x 2 in.
See dotted lines in dimension drawing.
2. Note direction of air stream and position chassis as a
template to make the two mounting hole locations.
3. Center punch and drill mounting holes. Secure device
with sheet metal screws.
WIRING
Disconnect power supply before making wiring connections to
avoid possible electrical shock or equipment damage. All
wiring must agree with local codes and ordinances.
Wire the sail switch in series with the load to act as an air
velocity limit switch.
Fig. 2. S437 Schematic and Typical Connections
Fig. 3. S637 Schematic and Typical Connections.
Set Differential
The knurled wheel at the base of the switch is marked with the
letters A, B, C, D to indicate relative differentials from minimum
to maximum. Follow instructions of system manufacturer, if
available, or adjust to suit actual operation.
A minimum differential setting (position A) of approximately
550 fpm (2.8 m/s) results in a make velocity of approximately
1900 fpm (9.7 m/s). The break velocity is 1350 fpm (6.9 m/s)
for any setting of the differential.
Sail Size
All velocities given above are for a standard size sail. The large
sail operates the switch at reduced velocities.
To control at higher velocities, the size of the sail must be
reduced in inverse proportion.
Example: 2 x velocity = 1/2 sail size.
CHECKOUT
Operate the system through at least one complete cycle to
make certain all equipment is controlled properly.
1 SWITCH MAKES ON INCREASING AIR VELOCITY.
1
M27087
TO
LOAD
S437A, B
NC NC
C
TO
SIGNAL COMMON
TO
LOAD
S637A
1 SWITCH MAKES C TO NO ON INCREASING AIR VELOCITY.
M27088

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
S437A,B, S637A SAIL SWITCHES
® U.S. Registered Trademark
© 2007 Honeywell International Inc.
60-2186—2 J.I. Rev. 10-07
By using this Honeywell literature, you agree that Honeywell will have no liability for any damages arising out of your use or modification
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including attorneys’ fees, arising out of, or resulting from, any modification to the literature by you.