Greenheck GreenVent Installation Manual

Part #472864

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Model GreenVent Constant

Pressure Controls

Installation, Operation and Maintenance Manual

Please read and save these instructions for future reference. Read carefully before attempting to
assemble, install, operate or maintain the product described. Protect yourself and others by observing
all safety information. Failure to comply with instructions could result in personal injury and/or
property damage!

GreenVent Constant
Pressure Controls

GreenVent constant pressure control system is a
packaged system designed specifically to exhaust
air from high rise buildings, condos, dormitories
and hotels. The system includes an exhaust fan
with Vari-Green motor, pressure transducer,
pressure tap, and controller. The system is UL
listed and designed with considerations for lint
laden air. Performance ranges from 500-3000 CFM
and up to 1 inch of pressure. Fan models available
are G, CUE, CW, and SQ. Each system shall bear
a manufacturers nameplate.

General Safety Information

Only qualified personnel should install this product.
Personnel should have a clear understanding of these
instructions and should be aware of general safety
precautions. Improper installation can result in electric
shock, possible injury due to coming in contact with
moving parts, as well as other potential hazards.
Other considerations may be required if high winds
or seismic activity are present. If more information
is needed, contact a licensed professional engineer
before moving forward.

DANGER

Always disconnect, lock and tag power source before
installing or servicing. Failure to disconnect power
source can result in fire, shock or serious injury.

CAUTION

When servicing the fan, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.

CAUTION

Precaution should be taken in explosive
atmospheres.

Follow all local electrical and safety codes, as well as
the National Electrical Code (NEC) and the National
Fire Protection Agency (NFPA). Where applicable,
follow the Canadian Electric Code.

1. The rotation of the wheel is critical. It must be free
to rotate without striking or rubbing any stationary
objects.

2. Motor must be securely and adequately grounded.

3. Do not spin fan wheel faster than maximum
cataloged fan RPM. Adjustments to fan speed
significantly affects motor load. If the fan RPM
is changed, the motor current should be checked
to make sure it is not exceeding the motor
nameplate amps.

4. Do not allow the power cable to kink or come in
contact with oil, grease, hot surfaces, or chemicals.
Replace cord immediately if damaged.

5. Verify that the power source is compatible with
the equipment.

6. Never open access doors to a duct while the
fan is running.

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GreenVent Constant Pressure Controls

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Receiving

Upon receiving the product check to make sure all
items are accounted for by referencing the bill of
lading to ensure all items were received. Inspect
each crate for shipping damage before accepting
delivery. Notify the carrier if any damage is noticed.
The carrier will make notification on the delivery
receipt acknowledging any damage to the product.
All damage should be noted on all the copies of the
bill of lading which is countersigned by the delivering
carrier. A Carrier Inspection Report should be filled out
by the carrier upon arrival and reported to the Traffic
Department. If damaged upon arrival, file a claim
with carrier. Any physical damage to the unit after
acceptance is not the responsibility of Greenheck
Fan Corporation.

Unpacking

Verify that all required parts and the correct quantity
of each item have been received. If any items are
missing, report shortages to your local representative
to arrange for obtaining missing parts. Sometimes it
is not possible that all items for the unit be shipped
together due to availability of transportation and truck
space. Confirmation of shipment(s) must be limited to
only items on the bill of lading.

Handling

The motor amperage and voltage ratings must be
checked for compatibility to supply voltage prior to
final electrical connection. Wiring must conform to
local and national codes. Consult local code authorities
for specific requirements.

use a portable electric heater to get rid of any moisture
buildup. Leave coverings loose to permit air circulation
and to allow for periodic inspection. The unit should
not be stored on the floor.

Inspection and Maintenance
During Storage

While in storage, inspect product once per month.
Keep a record of inspection and maintenance
performed. If moisture or dirt accumulations are found
on parts, the source should be located and eliminated.

GreenVent Installation and
Setup Guide

This guide provides instructions for how to
install, wire and program the GreenVent control
system for use when constant pressure in a duct
system is required. This does not cover ductwork
recommendations or other considerations. When
installed, this control system will automatically vary
the speed of a booster fan to maintain a constant
pressure within the system. A Greenheck exhaust
fan with a Vari-Green motor is required for use with
the controls and must be ordered separately.

Parts List (Provided by Greenheck)

1. Pressure Tap

Storage

Product is protected against damage during shipment.
If the product cannot be installed and operated
immediately, precautions need to be taken to prevent
deterioration of the product during storage. The
user assumes responsibility of the product and
accessories while in storage. The manufacturer will
not be responsible for damage during storage. These
suggestions are provided solely as a convenience
to the user.

Indoor Only

Do not store this product outdoors. The ideal
environment for the storage of this product is indoors,
above grade, in a low humidity atmosphere which
is sealed to prevent the entry of blowing dust, rain
or snow. Temperatures should be evenly maintained
between 30° to 110°F (-1° to 43°C) (wide temperature
swings may cause condensation and “sweating” of
metal parts). All accessories must be stored indoors in
a clean, dry atmosphere.

Remove any accumulations of dirt, water, ice, or
snow and wipe dry before moving to indoor storage.
Allow cold parts to reach room temperature to avoid
“sweating” of metal parts. To dry parts and packages,

2. Pressure
Transducer

3. Control Box

Parts Needed
(Not provided by
Greenheck)

• 18 - 20 gauge 3-wire plenum rated control wire

• 1/4 inch inside diameter plastic tubing

• Switch for optional remote override

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Installation

Pressure Tap

• In the duct of the system that you intend to
control, drill a 13/32 inch hole. The location will
depend on the layout of the system. For stacked
systems, locate the pressure tap 1/3 of the way
from the bottom of the duct.

• Install pressure tap using two screws. Orientation
does not matter.

Wiring

See diagram on page 6 for wiring overview.

• Pressure Transducer to Control Box

Pressure Transducer

Terminal

+ to 1

- to 2

0 to 4

Controller Terminal

Pressure Transducer

• The pressure transducer should be mounted
as close as possible to the pressure tap in an
accessible location to minimize the length of
tubing necessary to connect them. This will
minimize chances of kinks or punctures in
the tubing.

• Mount the pressure transducer in the vertical
position with the tubing connectors in the
down position.

• Connect the pressure tap to the pressure
transducer using 1/4-inch tubing. Connection
to the pressure transducer is made on the high
connector. The low connector remains open
to atmosphere.

Control Box

• The control box should be securely mounted
in an accessible location that will allow for
programming and use of the controller. Common
locations include: utility closet, mechanical
room, etc. The enclosure is also NEMA-3R rated
for outdoor mounting such as on a roof curb
provided that liquid-tight conduit is used.

Additionally, the control box should be mounted
in a location less than 100 feet from the exhaust
fan and the pressure transducer to avoid signal
losses in the low-voltage control wire.

• Control Box to Motor

Low-voltage
control wiring

High-voltage
power wiring

Controller

Terminal

1 to Black
2 to White
3 to Red

L1 to Black
L2 to White

G to Green

Motor

IMPORTANT

Low-voltage control wire and high-voltage power
wiring must be run from the controller to the fan in
separate conduit.

• Connect 115 volt, single-phase power to the
disconnect switch on the outside of the
control box.

• Optional Remote Override:
Connect a normally-open switch between

connection 11 and 12 on the top of the controller.
Closing this switch will activate the remote
override feature. Opening the switch will
de-activate the override.

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