Please read and save these instructions. 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! Retain instructions for future reference.
Model G
Direct Drive
Model G is a direct drive downblast
centrifugal exhaust fan. These
fans are specifically designed
for roof mounted applications
exhausting relatively clean air.
Performance capabilities range
up to 4,300 cfm (7,305 m
up to 1 in. wg (249 Pa) of static
pressure. The maximum continuous
operating temperature is 180°F
(82ºC). G models are available
in 27 sizes with nominal wheel
diameter ranging from 8 to 24 inches (203 to 610 mm)
(060 - 243 unit sizes). Each fan shall bear a permanently
affixed manufacturer’s engraved metal nameplate
containing the model number and individual serial
number. All fans are UL/cUL listed Standard 705.
General Safety Information
3
/hr) and
Model GB
Belt Drive
GB Model Fans are belt drive
downblast centrifugal exhaust fans.
These fans are specifically designed
for roof mounted applications
exhausting relatively clean air.
Performance capabilities range up
to 44,700 cfm (75,950 m
up to 2.5 in. wg (623 Pa) of static
pressure. The maximum continuous
operating temperature is 180°F
(82ºC). GB models are available in
twenty sizes with nominal wheel
diameters ranging from 11 to 54 inches (279 to 1372 mm)
(071-540 unit sizes). Each fan shall bear a permanently
affixed manufacturer’s nameplate containing the model
number and individual serial number. All fans are
UL/cUL listed Standard 705.
3
/hr) and
Only qualified personnel should install this fan. 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.
1. 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 (CEC) in Canada.
2. The rotation of the wheel is critical. It must be
free to rotate without striking or rubbing any
stationary objects.
3. Motor must be securely and adequately grounded.
4. Do not spin fan wheel faster than max 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.
5. Do not allow the power cable to kink or come in
contact with oil, grease, hot surfaces or chemicals.
Replace cord immediately if damaged.
6. Verify that the power source is compatible with
the equipment.
7. Never open access doors to a duct while the fan
is running.
Model G/GB Centrifugal Roof Exhaust Fans
1
Receiving
(4) Drive Frame
Lifting Points
(2) Bearing Plate
Lifting Points
Hook With
Safety Latch
(Supplied by others)
Curb Cap
Screws
Screws
(44 mm)
1¾ in.
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.
Figure 2
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
G Direct Drive
Lift unit on to the roof utilizing hooks under the lip of the
shroud. Evenly space the hooks around the shroud using
a minimum of four lifting straps. Use a spreader bar to
ensure the straps do not come in contact with the unit
(see Figure 1).
Figure 1
Spreader Bar
Lifting Strap
Hook
Figure 3
GB Belt Drive
When lifting the unit on to the roof, use either the four
lifting points on the drive frame or the two lifting points
on the bearing plate if present (see Figure 2 for lifting
points). Access to the drive frame is accomplished by
removing the screws pointed out in Figure 3. The cover
can then be removed and placed on a flat surface in an
area protected from strong winds.
When G/GB unit is on the roof, move fan to desired
location using lifting points and fasten securely through
mounting holes in base. Shims may be necessary
depending upon roofing material thickness.
The motor amperage and voltage ratings must be
checked for compatibility to supply voltage prior to
final electrical connection. For G/GB installations, the
electrical supply should be routed through the conduit
chase located between the curb cap and the bottom of
the motor compartment. Wiring must conform to local
and national codes.
Model G/GB Centrifugal Roof Exhaust Fans
2
®
Storage
Fans are protected against damage during shipment. If
the unit cannot be installed and operated immediately,
precautions need to be taken to prevent deterioration of
the unit during storage. The user assumes responsibility
of the fan 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
The ideal environment for the storage of fans and
accessories 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° to43°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. To avoid
“sweating” of metal parts, allow cold parts to reach room
temperature. To dry parts and packages, 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 be stored at least 3½ inches (89 mm)
off the floor on wooden blocks covered with moisture
proof paper or polyethylene sheathing. Aisles between
parts and along all walls should be provided to permit air
circulation and space for inspection.
Inspection and Maintenance
During Storage
While in storage, inspect fans 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. At each
inspection, rotate the wheel by hand ten to fifteen
revolutions to distribute lubricant on motor. If paint
deterioration begins, consideration should be given to
touch-up or repainting. Fans with special coatings may
require special techniques for touch-up or repair.
Machined parts coated with rust preventive should be
restored to good condition promptly if signs of rust
occur. Immediately remove the original rust preventive
coating with petroleum solvent and clean with lint-free
cloths. Polish any remaining rust from surface with
crocus cloth or fine emery paper and oil. Do not destroy
the continuity of the surfaces. Thoroughly wipe clean
with Tectyl
For hard to reach internal surfaces or for occasional
use, consider using Tectyl
WD-40
®
506 (Ashland Inc.) or the equivalent.
®
511M Rust Preventive,
or the equivalent.
®
Removing From Storage
As fans are removed from storage to be installed in their
final location, they should be protected and maintained
in a similar fashion until the fan equipment goes into
operation.
Outdoor
Fans designed for outdoor applications may be stored
outdoors, if absolutely necessary. Roads or aisles for
portable cranes and hauling equipment are needed.
The fan should be placed on a level surface to prevent
water from leaking into the fan. The fan should be
elevated on an adequate number of wooden blocks so
that it is above water and snow levels and has enough
blocking to prevent it from settling into soft ground.
Locate parts far enough apart to permit air circulation,
sunlight and space for periodic inspection. To minimize
water accumulation, place all fan parts on blocking
supports so that rain water will run off.
Do not cover parts with plastic film or tarps as these
cause condensation of moisture from the air passing
through heating and cooling cycles.
Fan wheels should be blocked to prevent spinning
caused by strong winds.
®
Model G/GB Centrifugal Roof Exhaust Fans
3
WARNING
Installation, troubleshooting and parts replacement is
to be performed only by qualified personnel.
WARNING
Disconnect power before installing or servicing.
CAUTION
A fan manufactured with an explosion resistant motor
does not certify the entire unit to be explosion proof.
Installation
Typical Roof Mounting Installation
1. On the roof surface, cut an appropriate sized hole
and follow manufacturer’s instructions on curb
installation. Caulk and flash the curb to ensure a
water tight seal.
2. If unit is equipped with a backdraft damper, it should
be installed now.
3. Remove motor cover. Access to the motor
compartment is accomplished by removing the
screws as shown in Figure 3.
4. Only on GB Belt Drive fans. On the drive frame use
the lifting lugs to lift and place the unit on top of roof
curb. (Refer to Figure 2 on page 2).
5. Secure fan to curb using a minimum of eight lag
screws, metal screws or the suitable fasteners.
Shims may be required depending upon curb
installation and roofing material.
Note: Severe duty applications may require
additional fasteners.
6. Verify power line wiring is de-energized before
connecting fan motor to power source.
7. Connect power supply wiring to the motor as
indicated on the motor nameplate or terminal box
cover. Check the power source for compatibility with
the requirements of your equipment.
8. Check fan wheel for free rotation, re-center
if necessary.
9. Check all fasteners for tightness.
10. Mount and wire safety disconnect switch under
motor cover. Wire control switches at ground level,
refer to Figure 4.
11. Replace motor cover.
Typical Wiring Diagram
MOTOR
Figure 4
J-BOX
SUPPLY VOLTAGE
115/208-230/60/1
L1
L2
MOTOR
J-BOX
SUPPLY VOLTAGE
208-230/460/60/3
L1
L2
L3
Vari-Green Wiring
For Vari-Green wiring refer to the Vari-Green
Motor IOM PN 473681 for complete wiring and
operation instructions.
Model G/GB Centrifugal Roof Exhaust Fans
4
®
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