COOK SRSH User Manual

SRSH

Tamper Proof Centrifugal Roof Exhauster

INSTALLATION, OPERATION AND MAINTENANCE MAN-

This publication contains the installation, operation and
maintenance instructions for standard units of the SRSH-B
& SRSH-D: Tamper Proof Centrifugal Roof Exhauster.

Carefully read this publication and any supple­mental documents prior to any installation or
maintenance procedure.

Loren Cook catalog SRSH provides additional information
describing the equipment, fan performance, available
accessories, and specification data.

For additional safety information, refer to AMCA publica­tion 410-96, Safety Practices for Users and Installers of
Industrial and Commercial Fans.

All of the publications listed above can be obtained from
Loren Cook Company by phoning 417/869-6474, extension
166; by FAX at 417/832-9431; or by e-mail at info@loren­cook.com.

For information and instructions on special equipment,
contact Loren Cook Company at 417/869-6474.

Rotating Parts & Electrical Shock Hazard:

Disconnect electric power before working on unit.
Follow proper lockout / tagout procedures to ensure

the unit cannot be energized while being installed or
serviced.

A disconnect switch should be placed near the fan in
order that the power can be swiftly cut off, in case of
an emergency and in order that maintenance
personnel are provided complete control of the power
source.

Grounding is required. All field-installed wiring must
be completed by qualified personnel. All field­installed wiring must comply with National Electric
Code (NFPA 70) and all applicable local codes.

Failure to follow these instructions could result in
death or serious injury.

Storage

If the fan is stored for any length of time prior to installa­tion, store it in its original shipping crate and protect it from
dust, debris and the weather.

The attachment of roof mounted fans to the roof curb
as well as the attachment of roof curbs to the building
structure must exceed the structural requirements
based on the environmental loading derived from the
applicable building code for the site. The local code
official may require variations from the recognized
code based on local data. The licensed engineer of
record will be responsible for prescribing the correct
attachment based on construction materials, code
requirements and environmental effects specific to
the installation.

Failure to follow these instructions could result in
death or serious injury.

Installation

If the fan was delivered with the motor unmounted, see the
maintenance section for belt and pulley installation.

Damper Installation

If your fan is supplied with dampers, follow the directions
below. If your fan does not include dampers, proceed to Belt
and Pulley Installation.

a. Place the damper inside the curb or inside the duct

work. Ensure the damper will open freely for the correct

direction of the airflow.
b. Secure to curb at the damper shelf.
c. Drill hole in the curb shelf for conduit needed for motor

wiring.
d. Operate the dampers manually to ensure the blades

move freely.

e. Install fan over curb while aligning the conduit location

with the conduit hole in the curb.

Receiving and Inspection

Immediately upon receipt of an SRSH fan, carefully

inspect the fan and accessories for damage and shortage.

• Turn the wheel by hand to ensure it turns freely and
does not bind.

• Check dampers (if included) for free operation of all
moving parts.

• Record on the Delivery Receipt any visible sign of dam­age.

Handling

Lift the fan by the shipping carton or fan skirt only. Never

lift by the shaft, motor or housing.

SRSH-B/SRSH-D

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 name­plate. Refer to the Wiring Diagrams, next page.

Leave enough slack in the wiring to allow for motor move­ment 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 accord­ing 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 seri­ous 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.

Recommended Torque for Setscrews/Bolts (IN/LB)

Setscrews

Size

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

Key Hex

Across

Flats

Recommended

Torque Inch-lbs.

Min. Max. Size

Hold Down Bolts

Wrench

Torque (inch-lbs)

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 contam­inated air (airborne abrasives) should be inspected every
three months.

Regular inspections are recommended for fans exhaust­ing 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.

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Wiring Diagrams

Single Speed, Single Phase Motor

Ground A

L

High Speed

Low Speed

T-5

Ground B

Transformer**

1

Line

L

2

L

1

Line

L

2

Ground A

L3
L2
L1

L

Line

L

1

2

Link A & B

For 3 phase, damper motor voltage should be the same between L1 and
L2. For single phase application, disregard L3. *Damper motors may be
available in 115, 230 and 460 volt models. The damper motor nameplate
voltage should be verified prior to connection. ** A transformer may be
provided in some installations to correct the damper motor voltage to the
specified voltage.

T-1

T-4

Ground B

When ground is required, attach to ground A or B with no. 6 thread forming
screw. To reverse, interchange T-1 and T-4.

2 Speed, 2 Winding, Single Phase Motor

Ground A

T-1

T-4

Ground B

When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4 leads.

Single Speed, Single Phase, Dual Voltage

Ground A

L

T-5

J-10

Link A

Link B

Low Voltage

Ground B

Line

L

1

J-10

2

When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.

Typical Damper Motor Schematic

Fan

Motor

Transformer**

Wiring Diagrams

3 Phase, 9 Lead Motor

3 Phase, 9 Lead Motor
Y-Connection

Low Voltage

208/230 Volts

4

5

6

3

1

9

728

L2L

L

1

3

High Voltage

460 Volts

456

789

3

12

L2L

L

1

To reverse, interchange any 2 line leads.

2 Speed, 1 Winding, 3 Phase Motor

High Speed

1

Together

2

Motor

3

L

4

L

5
6

L

To reverse, interchange any 2 line leads. Motors require magnetic control.

2 Speed, 2 Winding, 3 Phase

To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
line leads.

3 Phase, 9 Lead Motor
Delta-Connection

Low Voltage

208/230 Volts

8

7

4

6

2

1

L

L

1

3

1

2

Line

3

2

9
5

3

L

3

Low Speed

Motor

High Voltage

460 Volts

789

456

3

12

L1L

L

2

L

1

1

L

2

2

3

L

3

4

Open

5
6

3

Line

Damper

Motor*

Second
Damper

Motor

• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling.

Fan Bearings

The fan bearings are provided prelubricated. Any spe­cialized lubrication instructions on fan labels supersedes
information provided herein. Bearing grease is a petroleum
lubricant in a lithium base conforming to a NLGI #2 consis­tency. If user desires to utilize another type of lubricant,
they take responsibility for flushing bearings and lines, and
maintaining a lubricant that is compatible with the installa­tion.

A NLGI #2 grease is a light viscosity, low-torque, rust­inhibiting lubricant that is water resistant. Its temperature
range is from -30°F to 200°F and capable of intermittent
highs of 250°F.

Bearings should be relubricated in accordance with the
following condition chart.

Conditions Chart

RPM Temp °F Greasing Interval

Up to 1000

1000 to 3000

-30 to 120 6 months

120 to 200 2 months

-30 to 120 3 months

120 to 200 1 month

-30 to 120 1 month

Over 3000

120 to 200 2 weeks
Any Speed < -30 Consult Factory
Any Speed > 200 1 week

For moist or otherwise contaminated installations; divide the interval by a
factor of 3. For vertical shaft installations divide the interval by a factor of 2.

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