Greenheck Fan SQ/BSQ manual Vari-Green Controls, Vari-Green Options, Daily Operating Comparison

Heating Cost

Cooling Cost

Fan Operating Cost

Example of potential savings based on a northeast city in the USA using Vari-Green components for variable volume.

Variable

Volume

Constant

Volume

Variable Volume Operating Cost Analysis

Variable Volume vs. Constant Volume $2,000

1,750

1,500

1,250

1000

750

500

250

$0

Vari-Green®Options

Demand Control Ventilation for

Multistory Buildings

Applications requiring constant pressure or variable volume can utilize SQ fans with Vari-Green motors and Vari-Green controls.

Demand control ventilation systems reduce the amount of energy used by decreasing the speed of the fan when demand is low. This in turn lessens the amount

of conditioned air exhausted and further reduces total operating costs associated with air conditioning and heating in multistoried buildings such as: hotels, multifamily complexes, institutional facilities, and high rise commercial buildings.

Vari-Green®Controls

Transformer - Provides 24V power from the existing line voltage at the fan to the Vari-Green motor and controls. Dual voltage primary (120/240V) transformer provided with the fan.

Remote Dial - Allows for remote, manual airflow adjustments. Wall plate with dial may be mounted in a standard 2x4 inch electrical junction box.

Two Speed Control with Integral Transformer Control allows motor rpm to be set at two independent speeds (high or low). Meets minimum airflow requirements with the ability to bump up to high speed in emergency or meet maximum airflow requirements, or reset down to low for energy conservation.

Constant Pressure Control-Indoor - Control Vari- Green motor via static (variable volume) or velocity (constant CFM) pressure on the inlet or outlet side of the fan. Optional, one or two, duct or room probes for use in:

•Multifamily structures - Apartments, condos, hotels; dryers, residential kitchens and bathrooms.

•Institutional facilities - Schools, prisons, multistory office buildings; bathrooms.

The Vari-Green constant pressure control is pre- programed and easy to install for applications that include: venting dryers, bathrooms, residential type kitchen space or industrial process exhaust.

Contact fans@greenheck.com for more information.

Daily Operating Comparison:

Variable Volume and Constant Volume

								Hypothetical (Hotel Bathroom)
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

Note: A standard VFD compatible motor can also function within a variable volume system.

Constant Pressure Control-Outdoor (previously referred to as GreenVent)

Control Vari-Green motor via static pressure on the inlet side of the fan. Includes one duct probe and transducer for use in:

•Multifamily structures - Apartments, condos, hotels; residential kitchen, dryer facilities and bathrooms.

•Institutional facilities - Schools, prisons, multistory.

Air Quality – VOC - Control a Vari-Green motor via changes in volatile organic compounds (VOC’s). VOC’s are gasses that are emitted from humans, building materials, perfumes, foods, and furniture off-gassing. Range is 0-2000 CO2 ppm equivalent.

•Institutional facilities – Schools, court house, hospitals; bathrooms, waiting rooms, cafeteria.

•Commercial buildings – Office space, conference rooms, bathrooms, break room.

Air Quality – Temperature and Humidity - Control Vari-Green motor via changes in temperature, humidity, or both. Range is 32 to 120°F and 0 to 100% relative humidity.

•Multifamily structures – Apartments, condos, hotels; bathrooms, utility rooms.

•Commercial buildings – Office buildings; office

space, conference rooms, utility rooms, bathrooms.

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