Greenheck vari-green Installation, Operation & Maintenance Manual page 7

Controls: Operation, Wiring and Troubleshooting
Remote Dial and 2-Speed Control
Other Vari-Green controls, such as the Constant Pressure and Air Quality families of controls, have their own
®
manual that ship with the controller. They can also be found on Greenheck.com. See table on page 9 for document
numbers.
Remote Dial
Installation Overview: The remote dial is provided with
the fan, shipped loose for remote installation. It also
includes a factory mounted 24 VDC transformer.
1. Disconnect power to the fan.
2. Identify where the remote dial will be mounted.
3. Mount a standard single-gang 2x4 junction box.
4. Run a 3-wire control cable from the remote dial to
the fan motor compartment. The maximum distance
from the fan to the remote dial is 100 feet. If a greater
distance is required, signal loss may occur and cause
the fan to operate erratically.
5. Connect control cable to transformer mounted inside
fan motor compartment. Connect control cable to
remote dial.
6. Secure remote dial to 2x4 junction box.
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Remote Dial Assembly
Even though the motor may not be operating,
high voltage power may still be present at the motor.
Make sure to disconnect power to the fan before
servicing.
Troubleshooting - Remote Dial
Remote Dial does not adjust motor RPM
1. Check voltage to ensure the motor and transformer
are receiving the correct line voltage.
2. Check voltage at the remote dial. 24 VDC should
be present across the 24V and COM terminals.
0-10 VDC should be present across the 0-10V and
COM terminals.
3. Verify all of the connections at the transformer and
make certain that they are secure.
Terminals
24V-COM
0-10V-COM
CAUTION
Desired Voltage
24 VDC Nominal
0-10 VDC
(varies with dial position)
Vari-Green Motor 7