Installation, Wiring – Greenheck Vari-Green Control - Constant Pressure Outdoor ( 472864) User Manual
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Vari-Green Constant Pressure Controls
Installation
Pressure Tap
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on the layout of the system. For stacked systems,
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bottom of the duct. The pressure tap should be a
least 6 feet away from the fan inlet.
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does not matter.
Pressure Transducer
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and as close as possible to the pressure tap in an
accessible location to minimize the length of tubing
necessary to connect them.
This will minimize chances of kinks or punctures in
the tubing.
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position with the tubing connectors in the down
position.
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transducer is made on the high connector. The low
connector remains open to atmosphere.
Control Box
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accessible location that will allow for programming
and use of the controller. Common locations include:
utility closet, mechanical room, etc. The enclosure is
also NEMA-3R rated for outdoor mounting such as
on a roof curb provided that liquid-tight conduit is
used.
Additionally, the control box should be mounted in a
location less than 100 feet from the exhaust fan and
the pressure transducer to avoid signal losses in the
low-voltage control wire.
Wiring
See diagram on page 6 for wiring overview.
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disconnect switch on the outside of the control box.
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Connect a normally-open switch between
connection 11 and 12 on the top of the controller.
Closing this switch will activate the remote override
feature. Opening the switch will de-activate the
override.
Pressure
Transducer
Terminal
Controller
Terminal
+
to
1
-
to
2
0
to
4
Controller
Terminal
Motor
Low-voltage
control wiring
1
to
#MBDL
2
to
White
3
to
Red
High-voltage
power wiring
L1
to
#MBDL
L2
to
White
G
to
Green
IMPORTANT
Low-voltage control wire and high-voltage power
wiring must be run from the controller to the fan in
separate conduit.
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