Loren Cook SRSH Installation Manual

WARNING

This unit has rotating parts. Safety precautions
should be exercised at all times during installation,
operation, and maintenance.
ALWAYS disconnect power prior to working on fan.

Personal Safety

Disconnect switches are recommended. Place
the disconnect switch 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.

SRSH

Tamper Proof Centrifugal Roof Exhauster

INSTALLATI ON, OPERATION AND MAINTENANCE MANUAL

This publication contains the installation, operation
and maintenance instructions for st andard units of the
SRSH-Tamper Proof Centrifugal Roof Exhauster.

• SRSH-B/SRSH-D

Carefully read this publication 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
[e-mail].

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

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.

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.

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.

SRSH-B/SRSH-D

Wiring Installation

Personal Safety

Disconnect switches are recommended. Place
the disconnect switch 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.

Recommended Torque for Setscrews/Bolts (IN/LB)

Setscrews

Hold Down Bolts

Size

Key Hex

Across

Flats

Recommended

Torque

Min. Max. Size

Wrench

Torque

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

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.

Lock off all power sources before the fan is wired to

power source.

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 toWiring 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.

Do not allow the fan to run in the wrong direct ion. 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

If a problem is discovered, immediately shut the fan
off. Lock out all electrical power and c heck 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 o f satisfactory o pera-

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 an d tig ht en as
necessary.

24 Hour Interval

Inspect belt tension. Adjust and tighten as necessary.

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Wiring Diagrams

Fan

Motor

Damper

Motor*

Second
Damper

Motor

Transformer**

Transformer**

L3
L2
L1

T-1
T-4

Ground B

L

2

L

1

Ground A

Line

Ground B

J-10

T-5

Ground A

Link A

Link B

Low Voltage

Line

L

2

L

1

Ground A

Link A & B

L

1

L

2

Line

Ground B

T-5

J-10

Low Speed
Low Speed
Low Speed

High Speed
High Speed
High Speed

T

3

T

2

T

1

T

11

T

12

T

13

Motor

L

1

L

2

L

3

Line

Single Speed, Single Phase Motor

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

High Speed

Low Speed

L

1

Line

L

2

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

1

L

5
6

L

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

2 Speed, 2 Winding, 3 Phase

3 Phase, 9 Lead Motor
Delta-Connection

Low Voltage

208/230 Volts

8

7

4

6

2

1

L

L

1

3

2

Line

3

2

Motor

9
5

3

L

3

Low Speed

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

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

For 3 phase, damper motor voltage should be the same between L1 and
L

. For single phase application, disregard L3. *Damper motors may be

2

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.

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

To reverse: High Speed-interchange leads T
Low Speed-interchange leads T
line leads.

and T2. Both Speeds-interchange any 2

1

and T12.

11

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.

• 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.

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