COOK MPA Series User manual

MPA IO&M B51223-005
®
MPA
Modular Plenum Array
Installation, Operation, and Maintenance Manual
This publication contains the installation, operation and
maintenance procedures for standard units of the MPA:
Modular Plenum Array.
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Protect yourself and others by observing all safety
information. Failure to comply with instructions could result
in personal injury and/or property damage. For information
and instructions on special equipment, contact Loren Cook
Company at [phone].
General Safety
Only qualied personnel should install the fan. Personnel
should have a clear understanding of these instructions and
should be aware of general safety precautions. Improper
installation can result in electric shock, possible injury due
to coming in contact with moving parts, as well as other
potential hazards.
Important Guidelines:
• Follow all local electrical and safety codes, as well as
the National Electrical Code (NEC) and the National Fire
Protection Agency (NFPA), where applicable. In Canada,
follow the Canadian Electric Code (CEC).
• The rotation of the impeller is critical. It must be free to rotate
without striking or rubbing any stationary objects.
• Motor must be securely mounted and adequately grounded.
• Do not operate fan impeller faster than max catalogued fan
rpm. Adjustments to fan speed signicantly e󰀨ects motor
load. If the fan speed is changed, the motor current should be
checked to be sure it is not exceeding the motor nameplate
amps.
• Do not allow the power cable to kink or come in contact with
oil, grease, hot surfaces, or chemicals. Replace power cable
immediately if damaged.
• Verify that the power source is compatible with the equipment.
Receiving and Inspection
Carefully inspect the fan and accessories for any damage
and shortage immediately upon receipt of fan. All Cook
products are carefully constructed and inspected before
shipment to insure the highest quality and performance.
• Turn the wheel by hand to ensure it turns freely and does
not bind.
• Compare all components with the bill of lading or packing
list to verify that the proper unit was received.
• Check each unit for any damage that may have occurred
in transit.
• Record on the Delivery Receipt any visible sign of
damage.
Rotating Parts & Electrical Shock Hazard:
Fans should be installed and serviced by qualied personnel only.
Disconnect electric power before working on unit (prior to removal of
guards or entry into access doors).
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 o󰀨, in case of an emergency and in order that
maintenance personnel are provided complete control of the power
source.
When servicing the fan, the motor may be hot enough to cause pain or
injury. Allow motor to cool before servicing
Grounding is required. All eld-installed wiring must be completed by
qualied personnel. All eld installed wiring must comply with National
Electric Code (NFPA 70) and all applicable local codes.
Fans and blowers create pressure at the discharge and vacuum at the
inlet. This may cause objects to get pulled into the unit and objects to
be propelled rapidly from the discharge. The discharge should always
be directed in a safe direction and inlets should not be left unguarded.
Any object pulled into the inlet will become a projectile capable of
causing serious injury or death.
When air is allowed to move through a non-powered fan, the impeller
can rotate, which is referred to as windmilling.Windmilling will cause
hazardous conditions due to unexpected rotation of components.
Impellers should be blocked in position or air passages blocked to
prevent draft when working on fans.
Friction and power loss inside rotating components will cause them
to be a potential burn hazard. All components should be approached
with caution and/or allowed to cool before contacting them for
maintenance.
Under certain lighting conditions, rotating components may appear
stationary. Components should be veried to be stationary in a
safe manner, before they come into contact with personnel, tools or
clothing.
Failure to follow these instructions could result in death or serious
injury.

2
MPA IO&M B51223-005
Handling
Units shipped completely assembled may be lifted with
slings and spreader bars. Lift the fan in a fashion that
protects the fan and fan coating from damage. Never lift a
fan by the inlet or discharge ange, shafting or drives, motor,
impeller, motor base or housing, or in any other manner that
may bend or distort parts.
Lifting Instructions
Fans are designed to be lifted and moved as a single
module. Cook does not recommend lifting connected fan
modules unless the fan module(s) is supported on a common
base.
1. Carefully remove any crate and packing materials.
2. Place the bottom fans onto the mounting structure using
the recommended lifting points as shown. Lift each fan
individually into position.
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.
Short Term Storage
If fan installation is delayed, store the unit in a protected
area. Protect the motor bearings from moisture and vibration
(or shock loading).
Long Term Storage
If a fan is to be stored for any length of time and the
bearings are re-greasable, the motor bearings should
immediately be lled with grease while rotating the fan and
then the bearings should be re-greased and rotated monthly.
This will prevent moisture, which condenses within the
bearing, from corroding the raceways.
Storage Procedures
Fans should be stored indoors whenever possible where
control over temperature, humidity, shock and dust is
reasonably maintained. If units are to be stored outside, they
should be covered with a water-resistant material. Stored
equipment should be on a clean, dry oor or blocked up o󰀨
the ground to prevent unit from setting directly on the ground.
Periodic Check:
On a monthly interval, the equipment should be checked to
ensure that it has remained in an acceptable stored condition.
The fan and motor should be rotated several times by hand.
The fan impeller should be left at approximately 180 degrees
from that of the previous month to prevent damaging the
motor bearings.
Unit Start Up
When the unit is removed from storage, all grease should
be purged and replenished with fresh grease. The following
list should be adhered to insure proper operation:
Electrical Interferences Hazard:
Electrical Hazard:
Verify that proper safety precautions are followed: electrical power
must be locked o󰀨..
Check fan mechanism components:
• System connections are properly made and tightened.
• Impeller and fan surfaces are clean and free of debris.
• Rotate the impeller by hand to verify it has not shifted in
transit.
Check fan electrical components:
• Motor is wired for proper supply voltage.
• Motor was properly sized for power
• Motor is properly grounded.
• All leads are properly insulated.
• Trial “bump”:
• Turn on power just long enough to start assembly rotating.
• Check rotation for agreement with rotation arrow.
Preferred lifting method:
Eyebolt with washers and nut
Alternate lifting methods:
S-Hook
Safety Hook
Lifting Points – 5/8” diameter holes
Maximum Fan Weight Specifications
Fan Size Max. Fan Weight (lbs.)
MPA 100 240
MPA 120 270
MPA 135 300
MPA 150 340
MPA 165 430
MPA 180 476
MPA 195 528
MPA 225 815
MPA 245 890
MPA 270 975
MPA 300 1249
MPA 330 1331
MPA 365 2027
MPA 402 2110

3
MPA IO&M B51223-005
Hub
Bushing
Bushing Screws
Bushing Set Screw
D
C
B
A
D
C
B
A
Verify fastener tightness, these may have loosened
during shipment or installation:
• Bushing set screw torque
• Bolts on inlet funnel.
• Motor bolt torque
• Nuts holding housing frame to base and base to ground
(customer specications)
• Bushing fastener torque
• Ensure piezo ring tubing will not contact the impeller
Perform list again until unit is operating properly.
Motor Maintenance
The three basic rules of motor maintenance are to keep the
motor clean, dry, and properly lubricated. Keeping motors
and windings clean is important because dirt and dust
can cause heat to be trapped causing overheating and/or
premature failure. Blow dust and dirt out of windings and o󰀨
the motor periodically. Use low pressure (50 psi) airstream
to prevent winding damage. Keep the areas surrounding the
motor clear so the air can circulate through the motor cooling
fan.
Motors should be kept dry to avoid electrical short circuits.
Motors kept in storage for long periods of time can have
moisture condense on the windings. Be certain the motor is
dry before using.
Some smaller motors are permanently lubricated. Motor
bearing lubrication, if required, must follow a rigorous
schedule. Motors less than 10 hp running eight hours a
day in a clean environment should be lubricated once
every ve years; motors 15 to 50 hp, every 3 years; and
motors 50 to 150 hp, yearly. See motor manufacturer
specications for recommended greases. For motors in a
dusty or dirty environment or running 24 hours a day, divide
the service interval by 2. If the environment is very dirty or
high temperatures exist, divide the service interval by 4.
Lubrication requirements are normally attached to the motor.
Do not over-lubricate.
The major cause of motor bearing failure is contamination
of grease, insu󰀩cient grease, over lubrication, and
incompatibility of grease. If a fan is to be stored for any
length of time and the bearings are re-greasable, the motor
bearings should immediately be lled with grease while
rotating the fan and then the bearings should be re-greased
and rotated monthly. This will prevent moisture, which
condenses within the bearing, from corroding the raceways.
Troubleshooting
Use safety practices when investigating fan or system
performance problems. General safe practices and
performance troubleshooting guidelines can be found in
AMCA Publication 410: Recommended Safety Practices for
Users and Installers of Industrial and Commercial Fans, and
AMCA Publication 202-98 (R2011): Troubleshooting. Fan
application and eld measurement procedures can be found
in AMCA Publication 201-02 (R2011): Fans and Systems
and AMCA Publication 203-90 (R2011): Field Performance
Measurement of Fan Systems.
The following chart on page 4 indicate possible
areas to check when air or sound values do not meet
expectations. Most fan problems can be pinpointed to
one of these areas:
Bushing Fastener Torque
Bushing Type Screw Size Recommended
Torque
JA 10-24 60 in-lbs.
SD/SDS 1/4-20 108 in-lbs.
SK 5/16-18 180 in-lbs.
SF 1/8-16 360 in-lbs.
C
Bushing Set Screw Torque
Bushing Type Screw Size Recommended
Torque
SD/SDS 1/4-20 60 in-lbs.
SK 5/16-18 110 in-lbs.
SF 3/8-16 200 in-lbs.
B
Motor Bolt Torque
NEMA Frame Bolt Size
(Grade 5)
Washers
Size
(Top and
Bottom)
Recommended
Torque (ft-lb)
56-145T 5/16 5/16 18
182-215T 3/8 3/8 31
254U-286TS 1/2 1/2 75
324-365T 9/16 9/16 107
404T-405T 3/4 3/4 267

4
MPA IO&M B51223-005
Isolation
Structural bases must be sturdy enough to prevent exing
and vibration. Design, fabrication, and installation of the
isolation base are the customers responsibility.
After the fan, isolation base, and isolators are installed, the
entire assembly must be leveled. Floor mounted fans should
be installed on a at, level, rigid foundation.
Installation
Bolt the fan to the structure and adjacent fans using the
inlet and outlet mounting anges. The rst row of fans should
be securely installed before installing the second row of fans.
Cook does not recommend lifting and moving assembled
MPAs, as this may cause bending, distortion, and lead to
component misalignment.
A(top, bottom, and side connections)
Problem and Potential Cause
Air Capacity:
• Resistance of system not at design rating. If resistance is
lower than expected airow can be higher and horsepower
can be lower. If resistance is higher than anticipated, air
volume will be down.
• Fan speed is not at design speed.
• Air density not at design values. Also check air performance
measurement techniques / procedures.
• Mechanical air devices (e.g. dampers), are closed or plugged.
Also check lters.
• Impeller mounted improperly or is rotating in reverse.
• Parts of system or fan have been damaged or need cleaning.
Noise:
• Fan is not at design point of operation. Fan forced to operate
in an unstable ow region.
• Bearing failure. Check bearings.
• Supply voltage high or inconsistent supply frequency.
Adjustable frequency controllers can generate motor noise.
• Objects which are installed in a high velocity airstream can
generate noise. This includes ow sensors, turning vanes, etc.
• Non-uniform fan inlet conditions.
• Acoustics or sound measurement procedure incorrect.
Vibration:
• Misalignment of drive components.
• Poor foundations or mounting structure (resonances).
• Foreign object trapped in rotating components.
• Damaged rotating components.
• Broken, loose or missing setscrews.
• Loose bolts.
• Vibration transmitted by another source.
• Water accumulating in airfoil blades.
• Fan is operating in stall or unstable ow region.
NOTE: All MPA’s are factory balanced prior to shipment. Improper
handling and movement of the fan during shipment may cause the
rotating assembly to shift out of alignment. Balance should be checked
once the fan is installed or if the motor and wheel have been removed
or replaced. If a nal trim balance is required, it is the end user’s
responsibility to bring the fan back to factory specications (0.15 in/
sec Max). Final trim balancing is not the responsibility of Cook.
Foundation
Critical to every fan installation is a strong, level
foundation. Fans mounted to or within a structure should
be placed as close as possible to a rigid member such as a
wall or column. The structure must be designed for rotating
equipment; static design for strength is not su󰀩cient to
insure proper operation. Structural resonance should be at
least 20% above the maximum fan operating speed.
Any ducting should have independent support; do not use
the fan to support ducting. Isolating the fan from duct work
with ex connections eliminates transmission of vibration.
Intake Side
Supply Side

5
MPA IO&M B51223-005
*Intake Side Shown
• 1/2-13 x 1.00 Grade 5 Hex Head Cap Screw (or equivalent)
4 required (1 in each corner)
• 1/2 Flat Washer, 8 required (2 in each corner)
• 1/2-13 Hex Nut (or equivalent), 4 required (1 in each
corner). Recommended torque setting of 18 (ft-lb)
• Split Lock Washer (or equivalent), 4 required (1 in each
corner).
A *Intake Side
A
B(Middle connections)
*Intake Side Shown
• Intake Side Panel Connection: A series of .22” diameter
holes, 3” on center are provide to connect the front panel of
the fan assembly to the customer’s equipment. The holes
are sized for 1/4” sheet metal screws.
• All installation hardware supplied by end user.
B *Intake Side
B
Radial Gap, Overlap, and Impeller
Alignment
E󰀩cient fan performance can be maintained by having
the correct gap and overlap between the impeller and inlet
funnel. These items should be checked at installation, after
the fan has been in operation for 24 hours, and after the unit
has been serviced.
Gap: distance between the OD of the funnel and the ID
of the impeller concentricity.
Overlap: distance the funnel and impeller overlap one
another.
This sketch shows both the gap and overlap dimensions for
all sizes.
Gap
Overlap
Gap/Overlap Dimensions
Model Minimum
Overlap (in.)
Maximum
Overlap (in.) Minimum Gap (in.)
100 0.12 0.29 0.06
120 0.12 0.32 0.07
135 0.12 0.35 0.07
150 0.19 0.41 0.09
165 0.25 0.47 0.11
180 0.31 0.50 0.11
195 0.38 0.57 0.12
225 0.44 0.63 0.14
245 0.50 0.69 0.17
270 0.56 0.76 0.20
300 0.62 0.88 0.24
330 0.75 0.96 0.26
365 0.81 1.13 0.27
402 0.88 1.23 0.31
Gap is adjusted by loosening the inlet funnel bolts and
centering the funnel on the impeller.
Electrical Interferences Hazard:
Motor Interferences Hazard:
Never loosen the motor attachment bolts to make adjustments to the
impeller-to-funnel gap.
Overlap is adjusted by loosening the impeller hub from
the shaft and moving the impeller to the desired position
along the shaft. The transition between the inlet funnel and
impeller should be as shown; there is a smooth feel to the
prole when moving from one component to the other.

6
MPA IO&M B51223-005
P
To Piezo Ring
To Front Panel
BA
Front Pressure Tap
HIGH PRESSURE
Piezometer
LOW PRESSURE
AB
Piezometric Data
How It Works
The Piezo system is based on the principle of a ow
nozzle. The inlet funnel of the fan is used as the ow nozzle,
and the ow can be calculated by measuring the static
pressure drop through the inlet funnel. The pressure drop is
measured from the tap located on the face of the inlet funnel
to the piezometer in the throat. The inlet tap is connected to
the high-pressure side of the transducer and the piezometer
is connected to the low-pressure side (see following
diagram).Measurement of Airow
Several factors a󰀨ect the accuracy of this method of
determining ow. The equations below assume the following:
• There are no vanes or other obstructions in or near the inlet
• Impeller to inlet funnel overlap
• Flow entering the funnel (no pre-swirl)
• Accurate determination of air density at the inlet
K Factor Table
Model K Factor
100 592
120 842
135 963
150 1147
165 1450
180 1671
195 2087
225 2458
245 2941
270 4156
300 4810
330 5748
365 7072
402 8609
Calculation when using the Piezometer
For standard air (ρ = 0.075 lb/ft3) :
(CFM) = K Factor * √(delta pressure)
• K Factor = value from chart
• Delta Pressure (ΔP) = The di󰀨erential in static pressure
from the piezometer and the front pressure tap (inches
w.g.)

7
MPA IO&M B51223-005
Parts List
Part
No. Description
1 Wheel
2 Inlet
3 Motor
1
3
2

8
MPA IO&M B51223-005
August 2018
Corporate O󰀩ces 2015 E. Dale Street Springeld, MO 65803
Phone [phone] Fax [phone] LorenCook.com
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 modied 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 O󰀩ces, 2015 East Dale Street, Springeld, Missouri 65803-4637, explaining in writing, in detail, your
complaint and referring to the specic model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notied, 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 specically 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.