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Vari-Green
®
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100
80
60
40
20
0%
Time of Day
Hypothetical
(Hotel Bathroom)
Variable Volume - Load Shape
% of Operation
Series 1
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100
80
60
40
20
0%
Time of Day
Constant Volume - Load Shape
% of Operation
Series 2
Demand controlled ventilation offers significant energy savings by
exhausting only the necessary amount of air throughout the day.
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.
$
2,000
1,750
1,500
1,250
1000
750
500
250
$
0
Variable
Volume
Variable Volume vs. Constant Volume
Heating Cost
Cooling Cost
Fan Operating Cost
Constant
Volume
Example of potential savings
based on a northeast city in
the USA using Vari-Green
components for variable volume.
Variable Volume
Operating Cost Analysis
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.
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 CO
2
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.
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
Note: A standard VFD compatible motor can also function within a
variable volume system.