Greenheck Fan GB manual Options, Vari-Green Motor - Model G, Benefits, Features, Variable Volume

Options

Vari-Green™Motor - Model G

Greenheck’s electronically commutated 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..

The Vari-Green motor is available in 115 volt single phase horsepower; 1/4, 1/2, 3/4 and

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 constant as compared to an AC motor that decreases dramatically.

•Operates cooler than a standard AC motor..

A cooler motor has longer motor life and reduces energy consumption..

•80% usable RPM turndown vs. 30%, see chart

Motor Turndown Comparison

	600				50%			75%		100%
										￿
	500						G-123
										￿
(WATTS)							with PSC	￿
	400					￿	￿
						Not recommended
POWER	200
		with load of 0.35 BHP at full speed.		Single Phase*				￿	Savings	￿
	300	Length of each curve indicates the practical		GB-123					Energy	￿
		turndown range. Data is for 1/2 hp motors
INPUT			￿	￿			￿ G-		￿
	100								123 with
				￿		￿
		￿	￿
	0
	0	350		FAN SPEED (RPM)						1750

*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

•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..

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•Direct drive fans are often preferred where maintenance access is difficult..

•The Vari-Green motor reduces noise and vibration as well as providing solutions for variable volume system balancing..

Features

1.Vari-Green dial on motor control

A potentiometer (dial on motor control) is mounted right on the motor for easy speed adjustment for system balance.. Simply turn a dial instead of adjusting belts and pulleys..

2.Control wire inputs

Inputs provide a 0-10V DC signal to the motor from Building Automated System sensors or other controls to adjust motor speed..

1

2

Variable Volume

Variable volume or demand ventilation offers significant energy savings by only exhausting air when necessary throughout a day. This type of application can greatly reduce the operating costs associated with air conditioning and heating. Either a Vari-Green motor or standard VFD compatible motor can function within a variable volume system and help reduce energy consumption..

											Hypothetical
Operation							Variable Volume - Load Shape
	10080$$$$$$$$$$$$$$$$$$$$$$$$
	60
	40
of	20
	0%
%		1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20 21	22 23	24
										Time of Day
			Series 1

Demand controlled ventilation offers significant energy savings by exhausting only the necessary amount of air throughout the day.

Operation							Constant Volume - Load Shape
	100
	80
	60
	40
of	20
	0%
%		1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20 21	22 23	24
										Time of Day
			Series 2