Greenheck G/GB (471558) - Manual (Page 4)

Downblast Centrifugal Roof Exhaust 4
®
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, page 2.
4. On GB Belt Drive fans, use the lifting lugs on the
drive frame or bearing plate to lift and place the
unit on top of roof curb. Refer to Figure 2, page 2.
5. On G Direct Drive fans, lift and place the unit on
top of roof curb using hooks under the lip of the
shroud. Refer to Figure 1, page 2.
6. 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. See page 6.
7. Verify power line wiring is de-energized before
connecting fan motor to power source.
8. 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.
9. Check fan wheel for free rotation, recenter if
necessary.
MOTOR
L1
115/208-230/60/1 208-230/460/60/3
MOTOR
J-BOX J-BOX
SUPPLY VOLTAGE SUPPLY VOLTAGE
L2
L1
L2
L3
Typical Wiring Diagram
Figure 4
Vari-Green Wiring
For Vari-Green wiring, refer to the Vari-Green
Motor and Controls Installation, Operation and
Maintenance Manual for complete wiring and
operation instructions.
Roof Curb Installation
10. Check all fasteners for tightness.
11. Mount and wire safety disconnect switch under
motor cover. Wire control switches at ground
level, refer to Figure 4.
12. Replace motor cover.