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Specifications
Vari-Green™ Controls
Specification
Constant Pressure
Greenheck’s Constant Pressure system shall be
a complete package designed to regulate fan
speed based on demand while maintaining a
constant static pressure. System shall include
fan with Vari-Green™ Motor, Vari-Green Constant
Pressure control, transformer, and pressure tap.
Vari-Green Constant Pressure control shall have
the transducer integrated with a touch button
control panel. Control shall have a run mode and
a program mode preventing unwanted changes
when in run mode. Transformer shall be factory
supplied to provide power to the Vari-Green
Constant Pressure controller. System shall include
a self-sealing aluminum pressure tube with ¼-inch
connection. Fan shall be centrifugal direct drive
type in upblast, downblast, or inline configuration
with controllable EC Vari-Green motor.
Remote Dial
Remote Dial shall be a Vari-Green™ control
specifically designed to provide 0-10 volt DC
signal to Greenheck’s Vari-Green Motor.
2-Speed
2-Speed control shall be a Vari-Green™ Control
specifically designed to allow the Vari-Green
Motor to operate at two distinct speeds. 2-Speed
control shall include two dials that may be set
at any point between 0 and 10 volts DC and an
integral transformer capable of reducing 115/230
volt AC power to 24 volt AC power.
Motor to be a DC electronic commutation
type motor (ECM) specifically designed for fan
applications. AC induction type motors are
not acceptable. Examples of unacceptable
motors are: Shaded Pole, Permanent Split
Capacitor (PSC), Split Phase, Capacitor Start
and 3phase induction type motors. Motors shall
be permanently lubricated with heavy-duty ball
bearings to match the fan load and prewired to
the specific voltage and phase. Internal motor
circuitry shall convert AC power supplied to the
fan to DC power to operate the motor. Motor
shall be speed controllable down to 20% of full
speed (80% turndown). Speed shall be controlled
by either a potentiometer dial mounted on the
motor or by a 0-10 VDC signal. Motor shall be a
minimum of 85% efficient at all speeds.
Vari-Green™ Motor
Specification