Vari-Green - Greenheck G Manual

Vari-Green

Motor Option
®
Model G
Greenheck's electronically commutated (EC)
Vari-Green (VG) motor combines motor
technology, controllability and energy-efficiency
into one single low maintenance unit and is the
industry's first fully controllable motor. When combined
with Greenheck's G fans, all the CFM and static
pressure ranges of a belt drive can be attained with the
benefits of a direct drive.
Motor Information
HP RPM Volts
1/6 1725 115
1/4 1725 115
1/2 1725 115
1/2 2500 115
3/4 1725 115
3/4 2200 115
1 1725 115
1 1725 115/208-230
2 1725 208-230
Benefits
Operates on AC power that's converted to DC—
providing a more efficient motor operation as compared
to an AC operation.
• The motor can attain up to 85% efficiency and
reduce energy consumption.
• Watt savings of 30-70% depending on RPM.
Note: As motor speed is turned down, efficiency stays high
as compared to an AC motor that decreases dramatically.
• Operates cooler than a standard AC motor at lower
RPMs. A cooler motor has longer motor life and
reduces energy consumption.
• 80% usable RPM turndown versus 30%, see Motor
Turndown Comparison chart at right.
• G fans with Vari-Green motors can provide all the
CFM and static pressure ranges of a comparable
belt drive.
• Maintenance costs are reduced as there are
no belts or bearings to replace and no pulleys
to adjust.
• Direct drive fans are often preferred where
maintenance access is difficult.
• Provides a solution for demand controlled ventilation
applications.
Vari-Green Advantages
• Initial cost is similar to a belt drive
• Lower operating cost
• No maintenance, no belts, pulleys or bearings
• Easy RPM adjustment
8 8
®
Phase FLA Enclosure
Single 3.1 TENV
Single 3.9 ODP
Single 6.2 ODP
Single 6.5 ODP
Single 10.1 ODP
Single 11.3 ODP
Single 12.4 ODP
Single 12.0/6.0 TEFC
Single 12.0 TEFC
Features
1. Dial on Motor Control - a potentiometer (dial on
motor control) is mounted on the motor for easy
speed adjustment for system balance. Simply turn
the dial. There are no belts and pulleys to adjust.
2. Control Wire Inputs - the motor accepts a
0-10V DC signal from Building Automated
Systems or other controls to adjust
motor speed.
1 1
Comparisons:
Belt, Direct Drive with PSC
and Direct Drive with Vari-Green
Motor Turndown Comparison
600
500
400
300
GB-123
Single Phase*
200
100
0
0 350 FAN SPEED (RPM)
*
GB is a belt driven fan
The length of each curve indicates the practical turndown range.
Data is for 1/2 hp motors with load of 0.35 Bhp at full speed
Constant Volume Life Cycle Analysis
Three Year Cost Comparison
$ 2,000
1,750
1,500
1,250
1,000
750
500
250
$ 0
GB- G-
CUBE- CUE-
121 121 121-A5 123-A5
Initial Cost
Maintenance cost over three years
Operating cost over three years
Analysis is based on operating costs for a period of three years where
the fans operate continuously at 1725 rpm, 24/7, with an energy rate
of $0.10/kWh. Maintenance on the GB-121 is estimated at $65/yr.
Note: Example is based on a relative cost. Use and installation
variables may produce different results.
2
50% 75% 100%
G-123
with PSC
Not recommended
E E Energy
S S Savings
G-123 with
1750
G-
CUE-
121-VG 123-VG