Greenheck Fan SQ/BSQ manual Vari-Green Options, Vari-Green Motor - Model SQ

Vari-Green®Options

Vari-Green®Motor - Model SQ

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.

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.

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Comparisons: Belt, Direct Drive with PSC and Direct Drive with Vari-Green

Motor Turndown Comparison

	600			50%				75%	100%
	500					SQ-120			
									
(WATTS)	400					with PSC	
								
	300			Not recommended				 Energy Savings	
POWER				BSQ-120				
	200			Single Phase*
INPUT								
	100							SQ-120 with
				
	0		
	0	350		FAN SPEED (RPM)					1750

*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

• 80% usable RPM turndown vs. 30%. (chart at right)

• 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

Three Year Cost Comparison

$2,500

2,250

2,000

1,750

1,500

1,250

1000

750

500

250

$0

BSQ- SQ- SQ-

120 120-A5 120-VG

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 SQ-120 is estimated at $65/yr.

Note: Example is based on a relative cost. Use and installation variables may produce different results.

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