Install Instructions

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SUBMITTAL SHEET
The Model S1A is an Auxiliary End-Switch which can be easily installed on any existing MA-
ND4 motor actuator. The S1A is easy to wire up and comes with a 5 year warranty. The
superior design insures long life and no maintenance. The S1A is Listed and has an IP54
rated housing. The S1A also includes a Trip-Point adjustment, this allows for the installer
to specify exactly when the switch makes or breaks during the motor actuator’s rotation. A
positional arrow is also included that provides visual indication of blade travel.
Monitor open/close position of Duct Damper to:
Operate Blower motor to provide fresh air.
Provide a proving circuit for Combustion air.
Provide a failsafe interlock.
Operate a Hydronic Zone valve or Circulator.
And Various other applications
APPLICATIONS
FEATURES
Easy installation. No Tools Required!
Works with any existing MA-ND4, MA-15S or New
Generation LM-24 motor actuators.
SPDT switching
250VAC. 3 Amp Resistive / 0.5 Amp Inductive
120VAC. 3 Amp Resistive / 1.5 Amp Inductive
INSTALLATION INSTRUCTIONS
FIGURE 1 -- S1A ASSEMBLY
Remove existing Visual Indicator /
Positional Arrow.
Align the pins on the Mating Plate
with the Holes in the Actuator
Clamp. (See Figure 1)
Compress the Telescoping Hollow
Axle onto the Motor Actuator until
the S1A Fingers snap into place.
See reverse for Trip point
adjustment and wiring.
1.
2.
3.
4.
ACTUATOR
CLAMP
MATING
PLATE
HOLLOW
AXLE
FINGERS
Model S1A – Auxiliary End- Switch
Pilot Duty Only
385 Hwy. 33
Englishtown, NJ 07726
Ph: 800-446-3110
Fx: 732-446-5362
P/N 090377A0124 REV. B
CONTROLS INC.
E
W
Excellence Without Compromis
e
Copyright © 2007, EWC Controls Inc., All Rights Reserved
SUBMITTAL FORM
SUBMITTED BY:
JOB:
ARCHITECT:
ENGINEER:
CONTRACTOR:
LOCATION:
Forced Air Zone Controls
®