Peripherals Manual Sail Switches • 53
Sail Switches
S437A–P/N 205-0437
S637A–P/N 205-0637
Overview
The Honeywell S437A & S637A Sail Switches (CPC
P/N 205-0437 & 205-0637) can be used to determine when
there is airflow in a duct or when there is no airflow in a
duct. The two different states are determined by the way in
which the sail switch is wired (S637A) to an input board.
The S437A can only relay one state.
Specifications
Mounting & Wiring the S437A &
S637A
The Honeywell S637A Sail Switch (CPC P/N 205-
0637) can be wired so that it will relay two different states
to a 16AI or other CPC input board. Only one state can be
sent to the input board at anytime. The S437A can only re-
lay one state.
1. The sail switch should be mounted so that the
sail (metal plate) will be in the direct path of
an unrestricted airflow. Mount the switch so
that the sail is perpendicular to the ground
(short edge of sail is vertical, long edge is
horizontal) so that the effect of gravity on the
switch is negligible. It is satisfactory to
mount the switch in an airflow that is moving
upwards (sail moves from the down position
to the up position). Do not mount the switch
so that it will move from the up position to the
S437A S637A
Switch Type
Form A (SPNO) Form C (SPDT)
Switching
Action on In-
creasing Ve-
locity
One set of contacts opens, one set closes at
1900-2250 fpm. Varies directly with dif-
ferential setting.
Switching
Action on
Decreasing
Velocity
One set of contacts opens to de-energize
blower, one set closes to energize warning
circuit at 1350 fpm. Not adjustable.
Switch Dif-
ferential
Adjustable, 550-900 fpm
Sail Size
Standard—1 x 3 inches
Large—1 1/2 x 4 inches
Insertion
Length
Standard—3 1/2 inches
Large—4 1/2 inches
Maximum
Ambient
Tempera-
ture
150° F
Table 15-Technical Specifications for the S637A Sail Switch
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