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.
2
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.
3
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can damage
seal and reduce life through excess contamination and/or
loss of lubricant.
In the event that the bearing cannot be seen, use no
more than three injections with a hand operated grease
gun.
Lubricants
Loren Cook Company uses petroleum lubricant in a lithium
base conforming to NLGI grade 2 consistency. Other grades
of grease should not be used unless the bearings and lines
have been flushed clean. If another grade of grease is used,
it should be lithium-based.
A NLGI grade 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.
Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Direct Drive 1050/1075,1200,1300 &1500 rpm units use a
prelubricated sleeve bearing that has a oil saturated wicking material surrounding it. The initial factory lubrication is
adequate for up to 10 years of operation under normal conditions. However, it is advisable to add lubricant after 3
years. Use only LIGHT grade mineral oil or SAE 10W oil up
to 30 drops. If the unit has been stored for a year or more it
is advisable to lubricate as directed above. For units in
severe conditions, lubrication intervals should be reduced
to half.
Motors without sleeve bearings (as described above) will
have grease lubricated ball or roller bearings. Motor bearings without provisions for relubrication will operate up to 10
years under normal conditions with no maintenance. In
severe applications, high temperatures or excessive contaminates, it is advisable to have the maintenance department disassemble and lubricate the bearings after 3 years
of operation to prevent interruption of service.
For motors with provisions for relubrication, follow intervals of the table below.
Relubrication Intervals
NEMA Frame Size
Service
Conditions
Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
Up to and
including 184T
1800 RPM
and less
Over 1800
RPM
213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatable grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.
Motor Services
Should the motor prove defective within a one-year period,
contact your local Loren Cook representative or your nearest authorized electric motor service representative.
Changing Shaft Speed
All belt driven ventilators (5HP or less) are equipped with
variable pitch pulleys. To change fan speed, perform the following:
a. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
b. Turn the pulley rim to open
or close the groove facing.
If the pulley has multiple
grooves, all must be
adjusted to the same width.
c. After adjustment, inspect
for proper belt tension.
Speed Reduction
Open the pulley in order that
the belt rides deeper in the
groove (smaller pitch diameter).
Speed Increase
Close the pulley in order that
the belt rides higher in the
groove (larger pitch diameter).
Ensure that the RPM limits of
Maximum RPM
SRSH
Size
60-100 2125
120 1715
135 1620
150 1550
165 1325
180 1535
195 1370
210 1210
225 1060
245 900
270 765
Maximum RPM
the fan and the horsepower limits of the motor are maintained.
Replacing Pulleys and Belts
a. Clean the motor and fan shafts.
b. Loosen the motor plate mounting bolts to relieve the
belt tension. Remove the belt.
c. Loosen the pulley setscrews and remove the pulleys
from the shaft.
If excessive force is required to remove the pulleys, a
three-jaw puller can be used. This tool, however, can
easily warp a pulley. If the puller is used, inspect the
trueness of the pulley after it is removed from the shaft.
The pulley will need replacement if it is more than 0.020
inch out of true.
d. Clean the bores of the pulleys and place a light coat of
oil on the bores.
e. Remove any grease, rust or burrs from pulleys.
f. Place the fan pulley on the fan shaft and the motor pul-
ley on the motor shaft. Damage to the pulleys can occur
when excessive force is used in placing the pulleys on
their respective shafts.
g. After the pulleys have been correctly placed back onto
their shafts, tighten the pulley setscrews.
Belt and Pulley Installation
Belt tension is determined by the sound of the belts when
the fan is first started. The belts will produce a loud
squeal, which dissipates after the fan is operating at full
capacity. If belt tension is too tight or too loose, lost efficiency and damage may occur.
a. Loosen motor plate adjustment bolts and slide motor
plate so that belts easily slip into the grooves on the pulleys. Never pry, roll, or force the belts over the rim of the
pulley.
b. Slide motor plate until proper tension is reached. For
proper tension, a deflection of approximately 1/4” per
foot of center distance should be obtained by firmly
pressing the belt. Refer to Figure 1.
4
1 foot
1/4 inch
Figure 1
c. Lock the motor plate adjustment bolts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 2.
Tolerance
Center Distance
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Maximum
Gap
OFFSET ANGULAR OFFSET/ANGULAR
A
W
Wheel Replacement
a. Drill two holes approximately centered between the
shaft and the edge of the hub OD with the following
dimensions:
• 1/4" diameter
• 3/8" to 1/2" deep
• 180° apart in face of hub
b. Tap 1/4" holes to 5/16" thread with the 5/16" hole tap.
Do not drill or tap any larger than recommended.
c. Screw the puller arms into the tapped holes full depth of
threads (3/8" to 1/2" approximately). Align center of
puller with center of shaft. Make certain all setscrews in
hub (normally a quantity of two) are fully removed. Work
puller slowly to back wheel off the shaft.
Recommended Puller
Lisle No. 45000 Sterling Wheel Puller. This puller is available
at most automotive parts retail outlets.
Figure 2
X
Y
Z
B
CENTER
DISTANCE
(CD)
GAP
GAP
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley setscrew and by moving the motor pulley on the motor
shaft. Figure 2 indicates where to measure the allowable
gap for the drive alignment tolerance. All contact points
(indicated by WXYZ) are to have a gap less than the tolerance shown in the table. When the pulleys are not the same
width, the allowable gap must be adjusted by half of the difference in width. Figure 3 illustrates using a carpenter’s square
to adjust the position of the motor
pulley until the belt is parallel to the
longer leg of the square.
Bearing Replacement
The fan bearings are pillow block
type ball bearings.
a. Remove the old bearing.
b. Remove any burrs from the
shaft by sanding.
c. Slide new bearings onto the
shaft to the desired location
and loosely mount bearings
onto the bearing support. Bearing bolts and setscrews
should be loose enough to allow shaft positioning.
d. Correctly position the wheel and tighten the bearing
bolts securely to the bearing support.
e. Align setscrews bearing to bearing and secure tightly
to the shaft.
NOTICE! Never tighten both pairs of setscrews
before securing bearing mounting bolts. This may damage the shaft.
f. Inspect the wheel position again. If necessary , readjust
by loosening the bearing bolts and setscrews and
repeat from step e.
Figure 3
Above - Drilled hole placement.
Right - Wheel puller.
Wheel-to-Inlet Clearance
The correct wheel-to-inlet clearance is critical to proper
fan performance. This clearance should be verified before
initial start-up since rough handling during shipment could
cause a shift in fan components. Refer to wheel/inlet drawing for correct overlap.
Adjust the overlap by loosening the wheel hub and moving the wheel along the shaft to obtain the correct value.
A uniform radial gap (space between the edge of the
cone and the edge of the inlet) is obtained by loosening the
inlet cone bolts and repositioning the inlet cone.
Size Overlap
60 - 165 3/16”
180 - 245 1/4”
270 5/16”
5
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly.
•Poor fan inlet conditions. There should be a straight clear duct at the
inlet.
•Improper wheel alignment.
Excessive Vibration and Noise
•Damaged or unbalanced wheel.
•Belts too loose; worn or oily belts.
•Speed too high.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly.
•Bearings need lubrication or replacement.
•Fan surge.
Overheated Motor
•Motor improperly wired.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly.
•Cooling air diverted or blocked.
•Improper inlet clearance.
•Incorrect fan RPMs.
•Incorrect voltage.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
6
1
2
3
12
14
13
10
11
9
6
5
7
8
4
SRSH-B Parts List
Hood shown open for clarity
Part No. SRSH-B Parts Description Part No. SRSH-B Parts Description
1 Hood Assembly 9 Power Assembly
2 Locking Hasp 10 Bearings (2)
3 Door Stay Rail (2) 11 Shaft
4 Door Stay Strut (2) 12 Drive Sheave
5 Base Assembly with Skirt 13 Driven Sheave
6 Down Conduit 14 Belt
7 Motor Tray
8 Isolator (4)
15
Wheel
(Not Shown)
7
SRSH-D Parts List
1
2
3
4
9
8
6
5
7
Hood shown open for clarity
Part No. SRSH-D Parts Description Part No. SRSH-D Parts Description
1 Hood Assembly 6 Down Conduit
2 Locking Hasp 7 Motor Tray
3 Door Stay Rail (2) 8 Motor Isolator Assembly (4)
4 Door Stay Strut (2) 9 Motor
5 Base Assembly with Skirt 10 Wheel (Not Shown)
Limited Warranty
Loren Cook Company warrants that your Loren Cook fan was manufactured free of defects in materials and workmanship, to the extent stated herein. For a period of one (1)
year after date of shipment, we will replace any parts found to be defective without charge, except for shipping costs which will be paid by you.
This warranty is granted only to the original purchaser placing the fan in service.
This warranty is void if the fan or any part thereof has been altered or modified from its original design or has been abused, misused, damaged or is in worn condition or if the fan
has been used other than for the uses described in the company manual. This warranty does not cover defects resulting from normal wear and tear.
To make a warranty claim, notify Loren Cook Company, General Offices, 2015 East Dale Street, Springfield, Missouri 65803-4637, explaining in writing, in detail, your complaint
and referring to the specific model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notified, within thirty (30) days of
our receipt of your complaint, in writing, as to the manner in which your claim will be handled. If you are entitled to warranty relief, a warranty adjustment will be completed within
sixty (60) business days of the receipt of your written complaint by Loren Cook Company.
This warranty gives only the original purchaser placing the fan in service specifically the right. You may have other legal rights which vary from state to state.
For fans provided with motors, the motor manufacturer warrants motors for a designated period stated in the manufacturer’s warranty. Warranty periods vary from manufacturer
to manufacturer. Should motors furnished by Loren Cook Company prove defective during the designated period, they should be returned to the nearest authorized motor service station. Loren Cook Company will not be responsible for any removal or installation costs.
LOREN COOK COMPANY
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
lorencook.com
8
SRSH IOM - Dec 2013
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