Loren Cook IMH 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.
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation
and maintenance instructions for standard units of the
IMH - Industrial Material Handler. Carefully read this
publication prior to any installation or maintenance
procedure.
Loren Cook catalog, IMH, 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 on special equipment, contact Loren
Cook Company Customer Service Department at 417/869-
6474.
Receiving and Inspection
Carefully inspect the fan and accessories for any damage and shortage immediately upon receipt of the fan.
• Turn the wheel by hand to ensure it turns freely and
does not bind.
• Inspect dampers (if supplied) for free operation of all
moving parts.
• Record on the Delivery Receipt any visible sign of
damage.
Handling
Lift the fan by the base or lifting eyes. Never lift by the
shaft, motor, or housing.
Storage
If the fan is stored for any length of time prior to installation, completely fill the bearings with grease or moistureinhibiting oil (refer to Lubricants on page 6). Also, store the
fan in its original crate and protect it from dust, debris and
the weather.
Outdoor Storage
To maintain good working condition of the fan when it is
stored outdoors, follow the additional instructions below.
• Coat the shaft with grease or a rust preventative compound.
• Wrap bearings for weather protection
• Cover the inlet and outlet of the fan to prevent the accumulation of dirt and moisture in the housing.
• Periodically rotate the wheel and operate dampers (if
supplied).
• Periodically inspect the unit to prevent damaging conditions.
IMH
Industrial Material Handler
Installation
Most motors are shipped mounted on the fans with belts
and drives installed. However, extremely heavy motors and
drives are shipped separately. These motors and drives will
require field installation. Please refer to pages 3-5.
Foundation
This fan requires a strong, level foundation of reinforced
poured concrete. A correctly designed concrete foundation
provides the best means for mounting floor units. The foundation’s size is determined by fan size , moto r si ze and po sition, and the specific location of the installation.
Use the following guidelines to calculate foundation size:
• The overall dimensions of the foundation should extend
at least 6 inches beyond the outline of the fan and its
motor.
• The weight of the foundation should be 2 to 3 times the
weight of the unit and its motor.
Isolation
Isolation Base
To prevent vibration and noise from being transferred to
the building isolators are recommended. Arrangement 1
fans require an isolation base to effectively isolate the fan
system: fan, base, motor, drive, guards, etc. Bases must
have sufficient rigidity to resist belt pull and prevent drive
distortion which can lead to excessive belt and bearing
IMH
Figure 2 -Floor Mount Isolators
Rubber-In-Shear Isolator
Spring Isolator
Non-ducted Inlet Clearance
MIN 1 DIA
Correct
Incorrect
Free Discharge
Correct
Incorrect
Inlet Duct Turns
MIN 3
DIA
distortion which can lead to excessive belt and bearing
Note
Although a certain amount of vibration is inhe rent in
operating centrifugal fans, extreme vibration is a serious problem that may cause structural and mechanical failure.
Ceiling Mounted Spring Isolator Rubber-in-Shear Ceiling Isolator
Figure 1- Ceiling Mount Isolators
wear; its perimeter should contain all base angles and
rotating parts. Arrangement 10 fans above size 270 require
isolation rails. Please consult factory for isolation of
arrangement 9 fans due to the potential of uneven loading
caused by the motor and drives. Isolators should be
located between the fan system and the support structure.
Ceiling Mounted Isolators
Some applications require fan systems, designed for
floor mounting, suspended from ceiling supports. In such
cases, IMH fans of all arrangements should be installed on
either rails or bases in the classical orientation. Typically,
these systems are hung from the corners by rods, which
include isolation hangers of either spring or rubber-in-shear
design. Under no circumstances is the fan to be
inverted and hung by its base angles.
Duct Installation
Efficient fan performance relies on the proper installation
of inlet and discharge ducts. Be sure your fan conforms to
the guidelines below.
Non-Ducted Inlet Clearance
If your fan has an open inlet (no duct work), the fan must
be placed 1 fan wheel diameter away from walls and bulkheads. An inlet bell should be used in this case.
Floor Mounted Spring Isolators
a. Mount fan and motor on isolation base (if supplied).
b. Elevate fan (or isolation base) to operating he ight and
insert blocks to hold in position.
c. Position isolators under the fan (or isolation base) and
vertically align by inserting leveling bolt through
mounting holes in the fan or the base. The isolator
must be installed on a level surface.
d. Adjust the isolators by turning the leveling nut counter
clockwise several turns at a time alternately on each
isolator until the fan weight is transferred onto the isolators and the fan raises uniformly off the blocks. Then
remove the blocks.
e. Turn lock nut onto leveling bolt and secure firmly in
place against the top of the mounting flange or frame.
f. Secure isolators to mounting surface.
Floor Mounted Rubber-In-Shear (RIS) Isolators
a. Mount fan and motor on an isolation base (if supplied).
b. Elevate fan to provide room to insert isolators
between the fan and foundation and block in position.
c. Position isolators under fan and secure bolts.
d. Remove blocks and allow fan to rest on floor . Isolators
must be installed on a level surface (leveling should
not be required).
e. Secure isolators to mounting surface.
Free Discharge
Avoid a free discharge into the plenum. This will result in
lost efficiency because it doesn’t allow for a static regain.
Inlet Duct Turns
For ducted inlets, allow at least 3 fan wheel diameters
between duct turns or elbows and the fan inlet.
Discharge Duct Turns
Make sure that duct turns located near the fan discharge
curve in the direction of the fan’s rotation. Refer to the Discharge Duct Turns illustration on page 3.
2
Wheel-to-Inlet Clearance
Correct
Incorrect
Discharge Duct Turns
MIN 3
DIA
Wheel-to-Inlet Clearance and Overlap
Size
MH, MHBM MHR MHA
Wheel to Inlet
Ring Clearance
Wheel to Inlet
Ring Overlap
Min. Max. Min. Max.
70 3/16 5/16 1/8 1/4
90 3/16 5/16 1/8 1/4
110 3/16 5/16 3/16 5/16
130 3/16 5/16 1/4 3/8
150 3/16 5/16 1/4 3/8
170 3/16 5/16 5/16 7/16
190 3/16 5/16 3/8 1/2
210 5/16 7/16 7/16 9/16
230 5/16 7/16 7/16 9/16
260 5/16 7/16 1/2 5/8
290 5/16 7/16 5/8 3/4
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.
1 foot
1/4 inch
Figure 3
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 below for correct clearance.
Adjust the overlap by loosening the wheel hub and moving the wheel along the shaft to obtain the correct value.
WHEEL TO INLET
CLEARANCE
MH, MHB, MHR
always identify a closed switch to promote safety (i.e.,
red tape over a closed switch).
Wheel Rotation
Test the fan to ensure the rotation of the wheel is the
same as indicated by the arrow marked Rotation.
115 and 230 Single Phase Motors
Fan wheel rotation is set correctly at the factory. Changing the rotation of this type of motor should only be
attempted by a qualified electrician.
208, 230, and 460, 3 Phase Motors
These motors are electrically reversible by switching two
of the supply leads. For this reason, the rotation of the fan
cannot be restricted to one direction at the factory. See
Wiring Diagrams on page 4 for specific information on
reversing wheel direction.
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.
MHA
WHEEL TO INLET
OVERLAP
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.
Lock off all power sources before unit 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. To
remove motor, remove bolts securing motor base to power
assembly. Do not remove motor mounting bolts.
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
Belt and Pulley Installation
Belt tension is determined by the sound the belts make
when the fan is first started. Belts will produce a loud
squeal which dissipates after the fan is operating at full
capacity. If the belt tension is too tight or too loose, lost efficiency and possible damage can occur.
Do not change the pulley pitch diameter to change tension. This will result in a different fan speed than desired.
a. Loosen motor plate adjustment nuts and move motor
plate in order that the belts can easily slip into the
grooves on the pulleys. Never pry, roll, or force the
belts over the rim of the pulley.
b. Adjust the 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 3.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 4.
3
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