Greenheck WD Series User Manual
Damper Frame
1
⁄2 in.-14 NPSM
Damper
Blade
Damper
Tie Bar
Spring Rod
2
3
3
4
1
Document Number 452723
®
These instructions apply to the field installation of
end switch kits on Greenheck model WD Backdraft
Dampers. These end switch kits can be used in
conjunction with MP-100, MP-200, and MP-300
Series actuators.
End switches are typically wired to a fan and/or to a
light serving as an open/not open indicator. When the
damper is powered open, one of the damper blades
makes contact with the spring rod of the end switch
which in turn makes a connection allowing power
to flow to the fan and/or light. This set up would be
used when it is desirable to ensure that the damper
is fully open before the fan starts.
When the end switch is utilized to delay start
up of Vari-Green® or other ECM fan motors
(electronically commutated motor), a magnetic fan
starter is required.
Instructions:
1. Position end switch such that the back side of
damper blade trips the spring rod.
2. Mount end switch bracket to damper frame or
ductwork using
#10 x 1⁄2 in. self-drilling sheet metal screws
For use on WD series Dampers
Field Installation Instructions
Part # Qty. Description
1 1 End switch mounting bracket
Damper
Tie Bar
2 1 End switch
3 2 #6-32NC x 1½ in. machine screws with
4 2 #10 x ½ in. self-drilling sheet metal
UL/CSA Rating L67
15 Amps: 125, 250, or 480 VAC
0.25 Amps: 250 VDC
0.50 Amps: 125 VDC
nuts (packaged in end switch housing)
screws
3
End Switch Kit
Damper Frame
2
1
⁄2 in.-14 NPSM
Fan or
Light
L
1
L
2
N.C.
End
Switch
Note: Some actuators are multi-tap, use correct connections per
actuator wiring diagram.
Common
N.O.
Green
M
Damper
Actuator
Alternative wiring diagram
Wiring Illustration
Damper
Blade
Damper
Tie Bar
3
3
1
Spring Rod
4
End Switch Installation On
WD-100 Series Dampers
Damper Frame
Damper
Blade
4
Spring Rod
1
End Switch Installation On
2
1
⁄2 in.-14 NPSM
3
WD-200 & 300 Series Dampers
Copyright © 2014 Greenheck Fan Corporation
#452723 End Switch Rev 5 April 2014
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