Greenheck Fan RDU, RBUMO, RBU User Manual

1

Greenheck Model RBU, RBUMO and RDU fans are thoroughly inspected and test run at
the factory, however damage may occur during handling and shipping. Consequently, it
is important that the unit be carefully inspected for visible and concealed damage before
beginning installation. Report any damage to the shipper immediately. In
addition, assure all accessory items are accounted for.

INSTALLATION

LIFTING

Attach a suitable chain or strap to the four windband mounting brackets,
which are designed to be used as lifting lugs (Fig. 1). Do not lift the

fan by the motor, belt
tube, damper frame,
windband or
accessories.

Carefully lift the fan to
the roof curb and install
fasteners in all holes
provided in the unit
base. The windband
does not need to be
removed for the lifting
operation.

SERVICE ACCESS

MOTOR OUT OF AIRSTREAM

Model RBUMO simplifies inspection and servicing with the “motor out
of the airstream” design. A removable motor cover enables quick and
easy access to the motor, belt, and drives from the roof deck (Fig. 2).

Servicing of propeller and bearings can easily be accomplished by
removing the fan panel/windband assembly from the fan base.

REMOVABLE WINDBAND

By removing the bolts from the four windband mounting brackets, the
windband can be removed. With the windband removed, access to the
fan can be gained through the butterfly dampers. This service feature
applies to models RBU, RBUMO and RDU (Fig. 1).

Lifting Lug

Fig. 2

Fig. 1

GREENHECK

P.O. BOX 410 SCHOFIELD, WISCONSIN 54476-0410

PH. 715-359-6171

www.greenheck.com

®

READ AND SAVE THESE INSTRUCTIONS

Models RBU/RBUMO/RDU
Upblast Propeller Roof Fans
Belt Drive and Direct Drive

PN 455700

Installation, Operation and Maintenance Manual

2

ELECTRICAL CONNECTIONS

Before electrical connections are made, the supply voltage, phase and ampere capacity must be checked for compatibility
with the fan motor. In addition, the supply wiring must be properly fused and conform to local and national electrical codes.

The supply wires are then connected to an optional safety disconnect switch (if supplied) or wired directly to the motor.

For belt drive units in Emergency Smoke Removal installations, the electrical supply must be kept out of the airstream.
They may also require an isolated power supply so that if power is cut to the building in the event of a fire, the fan will
continue to operate. Check the local and national electrical codes for emergency smoke removal fans.

** WARNING **

Disconnect and secure to the “off” position all electrical power to the fan prior to inspection or
service.

Caution must be used when working around the fusible link damper lifters. They may release
the dampers unexpectedly.

Models RBU, RBUMO and RDU may have fusible link damper lifters and all models RBUMO with
high temperature options have fusible link damper lifters under spring tension. RBUMO fans
UL listed as “Power ventilators for smoke control systems” in sizes 42, 48, 54 and 60 have
extra heavy duty fusible link damper lifters under high spring tension that, for safety reasons,
must be pinned to prevent accidental release. See Fig. 3 below for details on how to secure the
lifter arms.

FAILURE TO COMPLY WITH THESE SAFETY PRECAUTIONS MAY

RESULT IN SERIOUS INJURY OR DEATH!

WARNING!
These fans have extra heavy duty fusible link
damper lifters under very high spring tension
that must be pinned so they can not be
accidentally tripped when servicing the fan. The

fusible link damper lifters are located under the
butterfly damper blades. Fig. A, shows where the
safety pin MUST be placed when the fan is being
serviced. Fig. B, shows where the safety pin is placed
for storage when the fan is in service. Fan sizes 20,
24, 30 and 36 also have fusible link damper lifters, but
they do not have the ability to be pinned when
servicing due to differences in lifter designs. In either

case, extreme care must be taken when working
around the damper lifter assemblies or serious
bodily injury or death may result.

For Models RBUMO with high temperature option - UL Listed

Models RBUMO with High Temperature Option - UL
Listed will bear the label shown at right. For fan sizes
42, 48, 54 and 60 Figs. A and B apply.

Safety Pin
Storage
Locations

Safety pins installed

to prevent closure
while servicing fan

Fig. A

Fig. B

Fig. 3

Electrical - This equipment must be
installed with remote overload
protection having adequate rating
as to voltage, frequency,
horsepower and full load current per
phase. Where connected to a circuit
protected by fuses, use time delay
fuses. For supply connection use
wires rated for at least 90°C (194°F)

Installation - When connecting
electrical power to this fan, do not
restrict motor movement. Motor
must have sufficient movement for
possible future belt or wheel
adjustment.

IMPORTANT

00453547

U

L

R

C

VENTILATOR
FOR
SMOKE
CONTROL
SYSTEMS.
76Y9

US LISTED