Benefits; Vari-Green Advantages; Constant Volume Life Cycle Analysis; Vari-Green Motor & Control Options - Greenheck SQ Brochure & Specs

Vari-Green
Vari-Green
®
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 SQ fans, all the CFM and static pressure
ranges of a belt drive can be attained with the
benefits of a direct drive.
The Vari-Green motor is available in:
• 1/6 - 3/4 horsepower 115 volt only.
• 1 horsepower 115/208-230 volt.
• 2 horsepower 208-230 volt.
All motors are available in a 50/60 Hz power.

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 vs. 30%.
• SQ 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.
• The Vari-Green 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
6
Options
®
Motor -
Model SQ
(chart at right)
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, Vari-Green Controls or other
controls to adjust motor speed.
®
1
Comparisons:
Belt, Direct Drive with PSC
and Direct Drive with Vari-Green
Motor Turndown Comparison
600
500
400
300
200

100
 
0
0 350
* BSQ 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
2,500
$
2,250
2,000
1,750
1,500
1,250
1000
750
500
250
0
$
BSQ-
120 120-A5
Initial Cost
Maintenance cost over three years
Operating cost over three years
2
50% 75%
SQ-120

with PSC

   
Not recommended

Energy Savings
BSQ-120

Single Phase* 



SQ-120 with


FAN SPEED (RPM)
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
SQ-120 is estimated
at $65/yr.
Note: Example is
based on a relative
cost. Use and
SQ- SQ-
installation variables
120-VG
may produce
different results.
100%



1750