COOK SRSH - Manual (Page 2)

2
Wiring Installation
All wiring should be in accordance with local ordinances
and the National Electrical Code, NFPA 70. Ensure the
power supply (voltage, frequency, and current carrying
capacity of wires) is in accordance with the motor name-
plate. Refer to the Wiring Diagrams, next page.
Leave enough slack in the wiring to allow for motor move-
ment when adjusting belt tension. Some fractional motors
have to be removed in order to make the connection with
the terminal box at the end of the motor.
Follow the wiring diagram in the disconnect
switch and the wiring diagram provided with the
motor. Correctly label the circuit on the main
power box and always identify a closed switch
to promote safety (i.e., red tape over a closed
switch).
a. Lift hood assembly which covers the motor assembly.
b. For internal wiring, run the electrical wire and conduit
through the opening drilled in the damper shelf (refer to
Damper Installation), then through the wiring conduit in
the ventilator base to the motor compartment. For
external wiring.
c. Pull the wires through and complete the wiring. For fur-
ther information. Refer to Wiring Diagrams on page 3.
Final Installation Steps
a. Ensure fasteners and set screws, particularly fan
mounting and bearing fasteners are tightened accord-
ing to the recommended torque shown in the table on
page 4, Recommended Torque for Setscrews/Bolts.
b. Inspect for correct amperage with an ammeter and cor-
rect voltage with a voltmeter.
c. Ensure that all accessories are installed.
d. Test the fan to be sure the rotation is the same as indi-
cated by the arrow marked Rotation.
NOTICE! Do not allow the fan to run in the wrong
direction. This will overheat the motor and cause seri-
ous damage. For 3-phase motors, if the fan is running
in the wrong direction, check the control switch. It is
possible to interchange two leads at this location so
that the fan is operating in the correct direction.
e. Inspect wheel-to-inlet clearance. Wheels may shift in
shipment. To realign wheel-to-inlet, shift upper bearing
so there is an equal radial clearance between the
wheel and inlet.
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power sources.
b. Inspect and tighten fasteners and setscrews, particu-
larly fan mounting and bearing fasteners Refer to
Torque chart.
c. Inspect belt tension and pulley alignment. Refer to Belt
and Pulley Installation, page 4.
d. Inspect motor wiring. Refer to Wiring Installation.
e. Ensure belt touches only the pulleys.
f. Rotate the wheel to ensure it rotates freely.
g. Ensure fan and ductwork are clean and free of debris.
h. Close and secure all access doors.
i. Restore power to fan.
Start-up
Turn on the fan. In variable speed units, set the fan to its
lowest speed. Inspect for the following:
• Direction of rotation
• Excessive vibration
• Unusual noise
• Bearing noise
• Improper belt alignment or tension (listen for squealing)
• Improper motor amperage or voltage
NOTICE! If a problem is discovered, immediately shut
the fan off. Lock out all electrical power and check for
the cause of the trouble. Refer to Troubleshooting on
page 5.
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory opera-
tion. During the inspections, stop the fan and inspect as
instructed.
30 Minute Interval
Inspect bolts, setscrews, and motor mounting bolts. Adjust
and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten as
necessary.
24 Hour Interval
Inspect belt tension. Adjust and tighten as necessary.
Maintenance
Establish a schedule for inspecting all parts of the fan. The
frequency of inspection depends on the operating conditions
and location of the fan.
Inspect fans exhausting corrosive or contaminated air
within the first month of operation. Fans exhausting contam-
inated air (airborne abrasives) should be inspected every
three months.
Regular inspections are recommended for fans exhaust-
ing non-contaminated air.
It is recommended the following inspections be conducted
twice per year:
• Inspect bolts and setscrews for tightness. Tighten as
necessary. Refer to Torque chart.
• Inspect belt wear and alignment. Replace worn belts with
new belts and adjust alignment as needed. Refer to Belt
and Pulley Installation, page 4.
• Bearings should be inspected as recommended in the
Conditions Chart.
Recommended Torque for Setscrews/Bolts (IN/LB)
Setscrews
Hold Down Bolts
Size
Key Hex
Across
Flats
Recommended
Torque Inch-lbs.
Min. Max. Size
Wrench
Torque (inch-lbs)
No.10 3/32” 28 33 3/8”-16 240
1/4” 1/8” 66 80 1/2”-13 600
5/16” 5/32” 126 156 5/8”-11 1200
3/8” 3/16” 228 275 3/4”-10 2100
7/16” 7/32” 29 348 7/8”-9 2040
1/2” 1/4” 42 504
5/8” 5/16” 92 1104
3/4” 3/8” 120 1440