43
Specifications
Vari-Green
®
Motor
Motor to be an electronic commutation (EC) motor
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 3 phase 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
®
Control - 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.
Vari-Green Control - Two Speed
Two speed control shall be a Vari-Green Control
specifically designed to allow the Vari-Green
Motor to operate at two discrete speeds. Two
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
115/208-240 volt AC power to 24 volt AC power.
Vari-Green Control – Indoor Air Quality –
Temperature / Humidity
Control to be a packaged indoor air quality control
designed to regulate fan speed based on level of
temperature and/or relative humidity in a space. Control
shall include a Proportional Integral Derivative (PID)
feedback loop and shall have labeled terminal strips
for easy wiring. Fan shall be direct drive including an
electronic commutation (EC) Vari-Green Motor. Control
package shall be Vari-Green Indoor Air Quality –
Temperature / Humidity Control.
Vari-Green Control – Indoor Air Quality –
VOC (Volatile Organic Compound)
Control to be a packaged indoor air quality control
designed to regulate fan speed based on level of
VOC concentration in a space. Control shall include a
Proportional Integral Derivative (PID) feedback loop and
shall have labeled terminal strips for easy wiring. Fan
shall be direct drive including an electronic commutation
(EC) Vari-Green Motor. Control package shall be Vari-
Green Indoor Air Quality – VOC Control.
Vari-Green Control – Constant Pressure
Control to be a packaged constant pressure control
designed to regulate fan speed based on demand.
Control shall include a Proportional Integral Derivative
(PID) feedback loop and shall have all components
prewired to labeled terminal strips for easy wiring.
System shall include the appropriate pressure tap and
preset pressure transducer. Fan shall be direct drive
including an electronic commutation (EC) Vari-Green
Motor. Control package shall be Vari-Green Constant
Pressure Control.
Indoor installations shall include pressure tap
(duct or room) and control box with integral
pressure transducer.
Outdoor installations shall include duct pressure tap,
pressure transducer, and control box. Control box shall
be prewired and in a NEMA-3R weather proof enclosure
for mounting outdoors near the fan location.
Reversible Direct Drive
Direct drive, axial type sidewall fans shall be provided
as follows:
Propellers shall be constructed with cast aluminum
blades and hubs. A standard square key and set
screw or tapered bushing shall lock the propeller to
the motor shaft. All propellers shall be statically and
dynamically balanced.
Motors shall be permanently lubricated, heavy duty
type, carefully matched to the fan load and furnished at
the specified RPM, voltage, phase, and enclosure.
Motor drive frame assemblies and fan panels shall
be galvanized steel or painted steel. Drive frame
assemblies shall be welded wire or formed channels
and fan panels shall have prepunched mounting holes,
formed flanges, and a deep formed double inlet venturi.
Drive frames and panels shall be bolted construction or
welded construction.
The axial exhaust or supply fans shall be tested in
accordance AMCA Standard 301 for Sound and
Air Performance.
Fans shall be Model SCR3 as manufactured by
Greenheck Fan Corporation, Schofield, Wisconsin, U.S.A.
