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PRESTARTING CHECKS — CAUTION: See **WARNING** on page 1
FASTENERS - Check all fasteners and set screws for tightness. This is especially important
for bearings and propellers. Rotate the propeller by hand to assure it turns freely and does not
rub on the fan tube. Also, lift the butterfly dampers to check if they open and close without
binding.
PROPELLER ROTATION - Direction of propeller rotation should be checked by turning the
unit on momentarily. Rotation should be in the same direction shown on the rotation decal
affixed to the unit or as shown in Fig. 3. To reverse rotation on three phase installations,
simply interchange two of the three electrical leads. For single phase installations, follow the
wiring diagram located on the motor nameplate.
FAN RPM - For belt drive units, the adjustable motor pulley is preset at the factory to the
customer specified RPM. Fan speed can be increased or decreased by the adjusting the pitch
diameter of the motor pulley. Multi-groove variable pitch pulleys must be adjusted an equal
number of turns open. Always check the motor amperage reading and compare it to the amperage rating shown on the motor
nameplate when changing fan RPM.
ROUTINE MAINTENANCE FOR DIRECT DRIVE FANS — CAUTION: See **WARNING** on page 1
Once the fan has been put into operation, periodic maintenance should be scheduled to assure reliability and performance. The
following items should be checked as a part of this maintenance schedule:
1. Fasteners and set screws 2. Lubrication 3. Removal of dust and dirt
1. FASTENERS AND SET SCREWS - Normal fan vibration has a tendency to loosen mechanical fasteners. Periodic inspection
should include checking all fasteners and set screws, including the propeller fasteners, for tightness.
2. LUBRICATION - Lubrication of motors is intended only when fittings are provided. Many fractional horsepower motors
are permanently lubricated and require no further lubrication. Motors supplied with grease fittings should be greased in
accordance with the manufacturers directions on the motor nameplate.
3. REMOVAL OF DUST AND DIRT - Model TAUD fans require very little attention when moving clean air. If exhausting dirty
or contaminated air, the propeller and butterfly damper assembly should be cleaned periodically. Accumulations of dirt and
debris on the propeller blades may cause an unbalanced condition resulting in excessive vibration and premature failure of the
propeller and motor. Excessive buildup of dirt on the damper blades may cause hinges to stick and bind resulting in loss of fan
performance.
Cleaning of the motor should be limited to the exterior. Removal of dust and dirt will assist in motor cooling. Motors should
never be sprayed directly with water, steam or solvents.
2
U
L
R
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
LISTED
POWER
VENTILATOR
FOR
SMOK E
CONTROL
SYSTEMS.
76Y9
LR-
34470
IMPORTANT
Rotation
FOR MODEL TAUB (SIZES 42 thru 60) WITH UL LISTED SMOKE EXHAUST CONSTRUCTION
Spring Lifter Tube
Lifter Arm
Spring Bracket
SpringLock Plate
Fusible Link
Assembly
Point “B”
Pin Storage Location
Point “A”
Install pin here to
lockout damper fifters
Models TAUB with UL Emergency Smoke
Listing will bear the label shown.
WARNING!
These fans have heavy duty fusible link damper lifters under very high spring tension that must be pinned so they
cannot be accidentally tripped when servicing the fan. The fusible link damper lifters are located under the butterfly
damper blades. Point “A”, shows where the safety pin MUST be placed when the fan is being serviced. Point “B”, shows
where the safety pin is placed for storage when the fan is in service.
Fan sizes 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.
Actual direction of rotation
will vary by model