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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
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.
00453547
VENTILATOR
FOR
SMOKE
CONTROL
SYSTEMS.
76Y9
IMPORTANT
C
US LISTED
U
L
R
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