Vari-Green Motor
PN 473681
®
Vari-Green Motor
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble,
install, operate or maintain the product described. Protect yourself and others by observing all safety
information. Failure to comply with instructions could result in personal injury and/or property damage!
Vari-Green Motor
The Vari-Green Motor is an electrically commutated
(EC) motor that uses 115V single phase input power
and internally converts it to a DC power supply which
provides an 80% turndown capability and increased
energy savings.
General Safety Information
Only qualified personnel should install this fan.
Personnel should have a clear understanding of these
instructions and should be aware of general safety
precautions. Improper installation can result in electric
shock, possible injury due to coming in contact with
moving parts, as well as other potential hazards.
Other considerations may be required if high winds
or seismic activity are present. If more information
is needed, contact a licensed professional engineer
before moving forward.
DANGER
Always disconnect, lock and tag power source before
installing or servicing. Failure to disconnect power
source can result in fire, shock or serious injury.
CAUTION
When servicing the fan, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.
CAUTION
Precaution should be taken in explosive
atmospheres.
1. Follow all local electrical and safety codes, as
well as the National Electrical Code (NEC) and the
National Fire Protection Agency (NFPA), where
applicable. Follow the Canadian Electric Code
(CEC) in Canada.
2. The rotation of the wheel is critical. It must be
free to rotate without striking or rubbing any
stationary objects.
3. Motor must be securely and adequately grounded.
4. Do not spin fan wheel faster than max cataloged
fan RPM. Adjustments to fan speed significantly
effects motor load. If the fan RPM is changed, the
motor current should be checked to make sure it is
not exceeding the motor nameplate amps.
5. Do not allow the power cable to kink or come in
contact with oil, grease, hot surfaces or chemicals.
Replace cord immediately if damaged.
6. Verify that the power source is compatible with
the equipment.
7. Never open access doors to a duct while the fan
is running.
Installation
1. Install motor in accordance with local codes. Verify
fasteners holding motor to fan are properly secured
and wheel is properly secured on motor shaft.
2. Wire motor based on mode of operation.
(See attached wiring diagrams.)
3. Energize motor and check for proper rotation.
Rotation should be CCW when viewing the
shaft end.
4. Adjust motor speed to verify the proper motor
speed controller functionality.
Operation
The Vari-Green motor offers 4 different control
options. Follow the correct wiring diagram based on
the control option desired.
Vari-Green Motor
1
Motor mounted potentiometer
A dial is mounted on the case of the motor
to adjust the speed. Use a screwdriver to
turn the potentiometer to adjust the speed
of the motor.
0-10VDC Control Signal
This option is selected when the user wants
to remotely control the speed of the motor.
A third-party controller is installed by others
that will give the motor a 0-10VDC
signal along with a 24VAC source
to power the controls in the
motor. The VA requirement
for the 24VAC source is 0.70.
The motor will operate within
the 2-10VDC range, while
0-1.9VDC the motor
will be off.
NOTES
2 VDC IS 15% AND 10 VDC IS 100%
OF NAMEPLATE RPM.
0-1.9 VDC IS OFF.
Vari-Green Remote Mounted
Speed Control
Installation Overview:
In addition to supplying the fan with power, a
3-wire control cable will need to be run from the fan
motor compartment to the location of the remote
speed controller.
The speed controller will mount to a standard
single-gang 2x4 junction box. If other mounting
methods are required, consult the factory.
The maximum distance from the fan to the
speed controller is 100 feet. If a greater distance is
required, signal loss may occur and cause the fan to
operate erratically.
Note: There is a small switch on the rear of the speed
controller (Circled on back view). This adjusts the
output range of the speed controller.
• The two settings are: 0-10V and 2-10V. The fan will
operate on either one of these settings.
• The Vari-Green motor operates on a 2-10V active
signal. This means that from 0-1.9V, the motor is
off. If you require the speed controller to turn the
motor off, select the 0-10V setting.
Note: Even though the motor may not be
operating, high voltage power will still be present
at the motor. Make sure to disconnect power to
the fan before servicing.
Vari-Green Motor
2
®
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