M.K.Plastics CNW User manual

M.K. Plastics Corp. Montréal, Québec, Canada [phone] www.mkplastics.com Page 1 of 12
Bulletin 10-02-February 2017
CNW
Centrifugal Fiberglass Fan
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Introduction
This bulletin contains the proper installation, operation and
maintenance procedures for the standard CNW Medium
Pressure and Volume Centrifugal Fiberglass Fan to ensure
safe and trouble-free fan operation. This bulletin
complements good general practices; however it is the
responsibility of the purchaser to provide qualified
personnel experienced in the installation, operation and
maintenance of air moving equipment.
The M.K. Plastics catalog on the CNW fan provides
additional information describing the equipment, fan
performance, available accessories and specifications. It is
available via our website at www.mkplastics.com.
For additional safety information, refer to AMCA publication
410: Recommended Safety Practices for Users and
Installers of Industrial and Commercial Fans.
For information on special fan application requirements,
please contact M.K. Plastics corporate office at
[phone], US Toll Free: 1-888-278-9988 or via our
website at www.mkplastics.com.
Figure 1
CNW Centrifugal Fiberglass Fan
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.
Electrical Disconnects
Every motor-driven fan should have an independent
disconnect switch to isolate the unit from the electrical
supply. The disconnect switch should be near the fan and
must be capable of being locked by maintenance personnel
while servicing the unit. Maintenance personnel must be
provided complete control of the power source.
Moving Parts
All moving parts must have guards to protect personnel.All
CNW fans are supplied with vented FRP belt and shaft
guards. Never start a fan without having all safety guards
installed. Check regularly for damaged or missing guards
and do not operate any fan with guards removed.
Sound
Fans can generate sound that could be hazardous to
exposed personnel. Appropriate ear protection should be
used by maintenance personnel.
Air Pressure and Suction
Fans present a hazard from the suction created at the fan
inlet. This suction can draw materials into the fan where
they become high velocity projectiles at the outlet.Inlets
and outlets that are not ducted should be screened to
prevent entry and discharge of solid objects. CNW fans
can be supplied with inlet and/or outlet PVC or stainless
steel screens.
Access Doors
Access doors to the duct system should never be opened
while the fan is in operation. Serious injury could result
from the effects of air pressure or suction.
Receiving and Inspection
All M.K. Plastics fans are carefully inspected before leaving
the factory. 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:
•Turn the wheel by hand to ensure it turns freely
and does not bind.
•Inspect the dampers (if supplied) for free operation
of all moving parts.
•Record on the Delivery Receipt any visible sign of
damage.
Mishandled units can void the warranty provisions. If units
are damaged in transit, it is the responsibility of the receiver
to make all claims against the carrier. M.K. Plastics will
assist the customer as much as possible; however claims

INSTALLATION, OPERATION & MAINTENANCE MANUAL CNW Centrifugal Fiberglass Fan Bulletin 10-02-February 2017
M.K. Plastics Corp. Montréal, Québec, Canada [phone] www.mkplastics.com Page 2 of 12
must be originated at the point of delivery. M.K. Plastics is
not responsible for damages incurred during shipment.
Handling
CNW Fans are to be hoisted and moved by the base or by
lifting lugs provided on the fan. See Figure 2. The location
of lifting lugs varies by fan size and arrangement.
Fans should never be lifted by the shaft, fan housing,
motor, belt guard, damper, weather hood, inlet & outlet
flanges or any other accessories.
Figure 2
Lifting Lug Locations
Storage
If the unit cannot be installed and operated immediately,
precautions need to be taken to prevent deterioration of the
unit during storage.Fans are frequently received on site
well before they are put into operation. Proper storage
techniques drastically reduce the likelihood of the fan not
operating successfully. The user assumes responsibility of
the fan and accessories while in storage. M.K. Plastics will
not be responsible for damage during storage.
Whenever possible store the fan and accessories in a
clean, dry and protected area. Ensure that the fan shaft,
bearings and impeller are protected against dust and
corrosion. Cover and seal bearings to prevent entrance of
contaminants. Cover the inlet and outlet to prevent the
accumulation of dirt and moisture in the housing. Cover
motors with waterproof material.
If it is necessary to store outdoors or within a building under
construction, special care must be taken to prevent
moisture, dirt or dust accumulation. Cover completely with
a tarp or heavy plastic wrap.
At least once a month, the impeller should be rotated about
ten revolutions to circulate the grease in the bearings. Stop
the shaft in a different location than where it was previously
stopped.
Block impeller to prevent natural rotation. Do not allow
material of any kind to be piled on top or inside of the fan.
Electrical connections and leads must be protected from
moisture. Reduce the belt tension on belt driven fans. This
reduces the load on the bearings, minimizing the potential
for problems. Do not store the fan in a location where it will
be subjected to vibration.
Pre-Installation
When the unit is removed from storage after a long
duration, the motor should be measured to verify that the
resistance is still at a satisfactory level compared to the
value recorded prior to storage.
Inlet & Outlet Fan Aerodynamic
Installation
Efficient fan performance relies on the proper
installation of inlet and discharge ducts. Installations with
poor inlet or discharge configurations may result in reduced
performance. Restricted or unstable flow at the fan inlet
can cause pre-rotation of incoming air or uneven loading of
the fan wheel resulting in increased system losses and
sound levels. Free discharge or turbulent flow in the
discharge ductwork will also result in system losses. Note
the following recommendations:
Inlet Duct Turns:
Installation of a duct turn or elbow too close to the fan inlet
reduces fan performance. To achieve full fan performance,
there should be at least three inlet diameters between duct
turns or elbows and the fan inlet. Abrupt turning without
rounded corners should be avoided. Turning vanes should
be installed when possible to maintain full fan performance.
See Figures 3 and 4.
Figure 3
Poor Inlet Duct Installation
Figure 4
Good Inlet Duct Installation
Lifting Lugs

INSTALLATION, OPERATION & MAINTENANCE MANUAL CNW Centrifugal Fiberglass Fan Bulletin 10-02-February 2017
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Inlet Spin:
A common cause of reduced fan performance is inlet spin.
To prevent this occurring, it is good practice to use turning
vanes in the duct to reduce the effects. See Figures 5
and 6.
Figure 5
Good Prevention of Inlet Spin
Figure 6
Poor Prevention of Inlet Spin
Discharge Duct Turns:
Where possible, allow a minimum of three outlet diameters
between the fan outlet and any turns or elbows. Fan
performance is reduced when turns are made immediately
off the fan discharge. See Figure 7.
The location of the CNW fan outlet can be catered to the
specific installation. Fourteen positions are available for
CNW fans. Where possible, use a different fan position to
reduce the amount of turns or elbows.
Figure 7
Poor vs. Good Outlet Duct Installation
Free Discharge:
Avoid a free discharge into a plenum. This will cause
turbulence and does not allow for static pressure regain
resulting in lost efficiency. See Figure 8.
Figure 8
Free Discharge to be avoided
Inlet & Outlet Fan Structural Installation
Fan Installation:
Follow proper handling instructions given on previous page,
paying attention to using the lifting lugs instead of any other
part of the fan to hoist or move the fan.
•Move the fan to the final mounting position.
•Remove skid, crates and packing materials
carefully.
•If supplied, place vibration pads or isolation base
on mounting bolts. Line up holes in the fan base
with bolts.
•Place fan on mounting structure. Carefully level
utilizing shims as required at all mounting-hole
locations. Bolt down the unit.
•Any grout may now be used. Bolt the fan in
position before applying grout. Do not depend
upon grout to support rotating equipment.
•Continue with the Operational Checklist, at the
end of this document.
Additional instructions may be given for some fan sizes,
components and accessories in the M.K. Plastics Submittal.
Support Structure:
Essential to every CNW fan installation is a strong, level
foundation under the fan, or rigid support structure to which
it is suspended. The foundation or support structure size is
determined by the fan arrangement, size, weight, motor
weight, position (fan orientation) and location of the
installation. Roof or floor structure supports should be per
the structural engineer in accordance with load
requirements and applicable building codes.

INSTALLATION, OPERATION & MAINTENANCE MANUAL CNW Centrifugal Fiberglass Fan Bulletin 10-02-February 2017
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Vibration Isolators:
To prevent vibration and noise from being transferred
to the building, vibration isolators are recommended.
Isolators should be located between the fan system and the
support structure. M.K. Plastics supplies four main types of
isolators for CNW fans. All are corrosion and weather
resistant using galvanized steel housings and epoxy-coated
steel springs.
•Floor Mounted Seismically Restrained Spring
Isolators (1” to 4” deflection.) See Figure 9.
•Floor Mounted Non-Restrained Housed Spring
Isolators (1” to 3” deflection.) See Figure 10.
•Floor Mounted Rubber-In-Shear Isolators (rubber
mounts, up to .5” deflection.) Metal parts are
embedded in elastomer for corrosion and weather
resistance. See Figure 11.
•Hanging Spring Isolators. See Figure 12.
Refer to the M.K. Plastics Submittal for isolator
installation and adjustment instructions.
Figure 9
Seismically Restrained Spring Isolators
Figure 10
Non-Restrained Housed Spring Isolators
Figure 11
Floor Mounted Rubber-In-Shear Isolators
Figure 12
Hanging Spring Isolators
After the fan and isolators are installed the entire assembly
must be leveled. Position the level on the fan base, not the
fan shaft for proper leveling. Additionally, the motor and fan
shafts must be level and parallel relative to each other for
proper alignment. Installation instructions are found on the
Vibration Isolator drawings which are supplied with each
CNW fan Submittal.
Inlet & Outlet:
To prevent vibration and noise from being transferred
to the ducting, flexible connectors are recommended.
Ductwork which is rigidly connected will transmit vibration
directly through the ductwork. This can cause structural
damage to the fan components and the support structure.
M.K. Plastics supplies vinyl compound FPVC flexible
connectors upon request. They can be used for the inlet,
outlet or both. Stainless steel draw bands are supplied for
attachment to the inlet sleeve, and an additional flange and
sleeve can be provided for the outlet upon request.
When installing the flex connectors, ensure that the
connector is not over compressed, such that it can be
drawn into the airstream, block or distort the flow into or out
of the fan. See figure 13.

INSTALLATION, OPERATION & MAINTENANCE MANUAL CNW Centrifugal Fiberglass Fan Bulletin 10-02-February 2017
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Figure 13
Flex Connector Installation
Care must be taken when using a fan to support ductwork.
CNW fans are not designed to carry high external loads.
Adding such loads to the fan may cause the impeller to rub
or cause other misalignments which could damage the fan.
Check with M.K. Plastics before mounting ductwork onto
the fan to ensure the fan design can handle the loads.
CNW fans can be supplied with extra front support to
accommodate specific installations such as Stack
Extensions.
The CNW outlet flange is supplied undrilled. Drilling can be
done by M.K. Plastics upon request, or done by the user. A
hole-pattern can be found on the CNW Data Sheet supplied
with the fan. This hole-pattern will ensure the structural
integrity of the FRP flange. An inlet flange can be supplied
when required, pre-drilled or undrilled.
When installing a flanged component to the CNW outlet or
inlet flange, a gasket is recommended. M.K. Plastics uses
a single-sided, neoprene sponge tape, 1/8” x 1”. This
avoids any leakage or any air being entrained into the
exhaust.
Care must be taken to avoid over-torqueing the bolts
attaching the CNW outlet or inlet flange. The FRP flange
may crack if too much torque is applied to these bolts. A
guideline is to crush the neoprene seal without collapsing it
entirely.
Wheel-Inlet Clearance
The correct wheel (impeller)-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. It should be
re-checked after the fan has been in operation for 24
hours. For all CNW fan sizes this clearance is 1/8”
(0.125”). See Figure 14. The clearance is adjusted by
loosening the wheel hub on the shaft and moving the wheel
to the correct position. A trim balance maybe required.
Figure 14
Wheel-Inlet Clearance
Drive Installation and Maintenance
Drive Alignment:
Belt drives are aligned in the factory, but may no longer be
aligned when the fan arrives at the job site. Parts can move
out of alignment during shipping and handling.
For belt driven fans, proper belt alignment is critical for long
belt life. Misaligned sheaves cause uneven belt wear and
additional flexing of the belt, both of which reduce the life of
the belt. Figure 15 shows properly aligned sheaves, as well
as sheaves with offset misalignment and sheaves with two
types of angular misalignment. Use a straightedge to
assess the alignment of the sheaves. Ensure that the
straightedge contacts the entire face of both sheaves.
Figure 15
Drive Misalignment
Pulley alignment is adjusted by loosening the motor sheave
setscrew and by moving the motor sheave on the motor
shaft, or by moving the entire motor along the motor
mounting bracket.
A recommended method of inspecting the pulley alignment
is shown in Figure 16. With the shorter leg of a carpenter’s
square or other straight edge lying along the case of the
motor, adjust the position of the motor sheave (or the motor)
until the longer leg of thesquareis parallel tothebelt.

INSTALLATION, OPERATION & MAINTENANCE MANUAL CNW Centrifugal Fiberglass Fan Bulletin 10-02-February 2017
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Figure 16
Method of Inspecting Pulley Alignment
Belt Tension:
Proper belt tension is important for long belt life and
optimum efficiency. Too much tension puts excessive loads
on the belts and the bearings which reduces the lives of
both components. Not enough tension allows belt slippage
which generates heat and drastically reduces the life of the
belt. The proper tension for operating a V-belt is the lowest
tension at which the belts will not slip at peak load
conditions.
All M.K. Plastics fans are shipped with the proper belt
tension. This tension is calculated for each specific fan
delivery, and is measured at the factory with a belt
tensioning gauge, as shown in Figure 17.
Figure 17
Belt Tensioning Gauge
When replacing the belt, if a belt tensioning gauge in not
available, the belt tension may be determined roughly by
the belt deflection half-way between pulley centers. The
deflection at the center should be roughly 1/50” for each inch
of belt span, or approximately 1/4” per foot of belt span. See
Figure 18.
Figure 18
Belt & Pulley Tension
Belt tension may also be 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. Re-tension the belts just tight enough so that the
squeal when starting the fan dissipates quickly. A short
“chirp” is acceptable; a squeal lasting several seconds or
longer is not.
New belts may stretch a little at first, so re-check belt
tension after 8 hours, 24 hours and 30 days of operation.
Do not change the sheave pitch diameter to change
tension. This will result in a different fan speed than
desired. Adjusting belt tension is easily done by raising or
lowering the motor support plate. Never use belt dressing
on any belts.
V-belt drives need periodic inspection, re-tensioning, and
occasional sheave and/or belt replacement. Dirt build-up,
burrs or obstructions can cause premature belt or drive
replacement. If burrs are found, use a fine emery cloth or a
stone to remove them. Be careful that dust does not enter
the bearings. Check sheaves for wear. Excessive slippage
of belts on sheaves can cause wear and vibration. Replace
worn sheaves with new ones. Carefully align sheaves to
avoid premature sheave failure (see previous section on
Drive Alignment.)
Recommended procedure for belt tensioning:
1. Loosen motor plate adjustment bolts and move
motor plate in order that the belts can easily slip
into the grooves on the sheaves. Never pry, roll,
or force the belts over the rim of the sheave.
2. Adjust the motor plate until proper tension is
reached.
3. Lock the motor plate adjustment nuts in place.
4. Recheck the alignment and realign the sheaves if
necessary.
Recommended procedure for sheave & belt
replacement:
1. Remove sheaves from their shafts.
2. Clean the motor and fan shafts.
3. Clean bores of sheaves and coat the bores with
heavy oil.
4. Remove grease, rust or burns from the sheaves
and shafts.
5. Remove burrs from the shaft by sanding.
6. Place fan sheave on the fan shaft and motor
sheave on its shaft. Damage to the sheaves can
occur when excessive force is used in placing the
sheaves on their respective shafts.
7. Tighten in place.
8. Install belts on sheaves and ensure proper
alignment and tension.
Motor Maintenance
Motor maintenance is per the Motor manufacturer’s
instructions which are supplied with the motor. However
the following guidelines may be used:
1. Keep the motor clean.
2. Keep the motor dry.
3. Keep the motor properly lubricated.
Blow dust off periodically with low pressure air to prevent
the motor from overheating.
On CNW fans, motor bearings are pre-lubricated and
sealed. Under normal conditions they will not require
further maintenance for extended periods. Use the motor
manufacturer’s recommendations for re-lubrication and
servicing.

INSTALLATION, OPERATION & MAINTENANCE MANUAL CNW Centrifugal Fiberglass Fan Bulletin 10-02-February 2017
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CNW fans that are Direct Drive Arrangement 4 are supplied
with a motor shaft that is drilled and tapped to
accommodate the fan shaft. Contact M.K. Plastics if a
motor replacement is ever necessary.
Should the motor prove defective within a one-year period,
contact M.K. Plastics directly, or you may contact your
nearest motor service representative.
Wheel and Shaft Maintenance
Periodically inspect the shaft and wheel for dirt buildup,
corrosion, and signs of excess stress or fatigue. The wheel
can be inspected via the Access Door. Clean the
components as necessary. If the wheel is removed for any
reason, make sure that it is securely attached to the shaft
before restarting the fan.
Drainage Detail
All CNW fans come with outlet drains due to water or
condensation that may accumulate. Proper disposal of the
water is necessary. Connect the drain outlet to a drainage
system (by others.) Piping must have adequate pitch for
proper runoff and be supported (if needed) to prevent the
possibility of sagging and overflow. The trap should be
filled before start-up.
“A” must be greater than system static pressure
“B” must be greater than ½ of the system static pressure.
“C” 1” water seal Figure 19
Drainage Detail
Fan Bearings
All CNW fans are equipped with solid pillow block bearings.
They are equipped with an integral set screw lock.
Fan Bearing Lubrication:
All CNW Fans use only Self-Lube pillow block bearings.
Bearings are factory charged with the correct amount of
grease and do not require further grease charge.
Re-lubrication is not required. See Figure 20.
Figure 20
Solid Pillow Block Bearing
Note: The motor bearing lubrication should be per the
motor manufacturer’s instructions.
Fan Bearing Replacement:
Fan bearing replacement intervals are defined by the fan
operator. M.K. Plastics does not define a schedule for
bearing replacement, as it is dependent on the
environment, usage and maintenance of each specific fan
installation. With proper installation, operation and
maintenance however, CNW bearings should last several
years. All CNW fans are equipped with NSK, RHP Self-
Lube cast iron pillow block units, NP or MP series.
Indicators that bearings need replacement include
excessive noise, vibration or heat in the vicinity of the
bearings.
In applications where contact with the exhaust poses a
serious contamination factor, the bearings can be removed
without removing the wheel and inlet cone. In this case, the
shaft must be held in place with suitable straps or bracings
firmly secured around the bearing support frame. The shaft
must be supported to restrict any lateral movement of both
the shaft and impeller.
Removal of Wheel, Shaft & Bearings:
1. Take note or make a sketch of the position on the
shaft of both bearing races, setscrews and the
wheel and sheave. If you are replacing the shaft
as well, these notes or sketch will give you
reference.
2. Mark the location and orientation of the inlet to
the casing and remove. Note the clearance
between the wheel and the inlet cone. This will
give you access to the wheel.
3. Remove the drive sheave from the shaft.
4. Start wheel removal by unscrewing the front
protective cap and then the nut, washers and
threaded stud assembly that holds the cap to the
fan shaft. Unscrew the setscrew collar. The wheel
can now be removed from the fan shaft. CNW
fans do not have bushings, the wheel is held in
place on the shaft with the threaded rod assembly,
the setscrew collar and key.
5. Remove the bearing housing mounting bolts and
remove the shaft and bearings as one unit. Keep
any existing shims in place.
6. The bearings are attached with set screws;
unscrew and slide the assembly off as one piece.
Tap on the bearing with a wood block and hammer
to remove if necessary.
7. If the existing shaft is being used, check the
shaft for nicks, burrs and damage. Remove any

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M.K. Plastics Corp. Montréal, Québec, Canada [phone] www.mkplastics.com Page 8 of 12
anti-corrosion coating with a suitable degreaser
and wipe clean.
Bearing Replacement:
1. Making sure that the setscrews are not protruding
from the inner bearing rings, slide the bearings
directly onto the shaft. If using an old shaft, make
sure the bearings are not mounted on a worn
section. Tapping the inner ring face with a soft
driver might be required. Do not hammer on the
housing.
2. The outer ring of the bearing is spherical and
swivels in the housing to compensate for
misalignment. Secure the housing to the stand
with the fixing bolts, but do not fully tighten.
3. Install the wheel on the shaft, and block it in place.
Install the inlet in its original location. Position the
wheel correctly by moving the shaft axially in the
bearing assemblies.
4. Tighten the setscrews on the bearings to
secure the shaft. Refer to torque chart in Figure
21.
5. Rotate the shaft by hand to allow the bearing outer
rings to find their center of free movement.
Test Run:
1. Re-install the sheave and adjust the belt tension.
2. Retighten all setscrews and mounting bolts using
torque from Figure 21.
3. Test run and trim balance as necessary.
CNW
Size Pillow Block
Bearing
Set
Screw
Torque
(in-lbs.)
Mounting
Bolt 304 SS Bolt
Torque
(in-lbs.)
316 SS
Bolt
Torque
(in-lbs.)
160 RHP, NP1 60 3/8-16UNC,
1.75L 236 247
200
250 RHP, MP1 60 1/2-13UNC, 2.00L 517 542
315
400 RHP MP17/16 110 1/2-13UNC,
2.25L 517 542
Figure 21
Bearing Setscrew & Mounting Bolt Torque
Changing Fan Shaft Speed
All belt driven fans with motors up to and including
5 HP are equipped with variable pitch motor sheaves. The
motor sheave diameter is variable by varying the width of
the sheave. To change the fan speed, perform the
following:
1. Loosen setscrew on driver (motor) sheave and
remove key, if equipped.
2. If the sheave has multiple grooves, all must be
adjusted to the same width.
3. After adjustment, inspect for proper belt tension.
4. To reduce speed, open the sheave in order that
the belt rides deeper in the groove (smaller pitch
diameter.)
5. To increase speed, close the sheave so that the
belt rides higher in the groove (larger pitch
diameter.) Make sure the maximum fan RPM and
maximum motor HP is not reached. The maximum
motor HP can be found on the motor nameplate.
Grounding Straps
If the fan is supplied with a graphite liner, a grounding strap
is provided on the bottom of the scroll housing for the
removal of static electricity. This strap must be connected
to the building electrical grounding circuit or the roof steel
structure. If an Aegis shaft grounding ring is supplied on
the motor, the motor support stand should also be
grounded. See Figure 22.
Figure 21
Grounding Strap location
Operational Checklist
Final Installation
Inspect fasteners and setscrews, particularly fan
mounting and bearing fasteners, and tighten according
to the recommended torque shown in Figure 21.
Inspect for correct voltage with voltmeter.
Ensure all accessories are installed.
Fill drainage system trap.
Pre-Start Checks
Shut off all primary and secondary power sources.
Ensure fasteners and setscrews are tightened.
Inspect belt tension and sheave alignment.
Inspect motor wiring.
Ensure belt touches only the sheaves.
Ensure fan and ductwork are clean and free of debris.
Inspect wheel-to-inlet clearance.
Close and secure access door.

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Restore power to the fan.
Start Up
Turn the fan on. In variable speed units, set the fan to
its lowest speed and inspect for the following:
Direction of rotation. (See direction arrow on back of
casing.)
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 check for the cause of the
trouble. See Troubleshooting at the end of this document.
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour, 24 hour and 30 day intervals of operation.
During the inspections, stop the fan and inspect:
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.
30 Day Interval: Inspect belt tension. Adjust and
tighten as necessary.
General Fan Maintenance
WARNING
Disconnect and secure to the ‘Off’ position all electrical
power to the fan prior to inspection and servicing.
Failure to comply with this safety precaution could
result in serious injury or death.
Once the unit has been put into operation, a routine
maintenance schedule should be established for
inspecting all parts of the fan. The frequency of inspection
depends on the operating conditions and the location of the
fan.
Regular inspections are recommended for fans exhausting
non-contaminated air. The following inspection is
recommended twice per year:
•Inspect fan impeller and housing for fatigue,
corrosion or wear.
•Inspect bolts and setscrews on wheel, housing and
bearings for tightness. Tighten as necessary.
Worn setscrews should be replaced immediately.
•Inspect belt wear, tension, alignment and dirt
accumulation. Replace worn belts with new belts
and adjust alignment as needed. If belts have
been replaced, new belts will stretch. Belt tension
needs to be checked and adjusted after 8 hours,
24 hours, and again after 30 days of operation.
Refer to Belt Tensioning section in this
document.
•Inspect springs and rubber isolators for
deterioration or breaks and replace as needed.
•Inspect for cleanliness. Clean exterior surfaces
only. Remove dirt from the wheel and housing to
prevent imbalance and damage.
•Blow dust off the motor with low pressure air to
prevent motor from overheating. Remove grease
on motor housing. See Motor Maintenance
section in this document for details.
Inspect fans exhausting corrosive or contaminated air
(containing airborne particles) within the first month of
operation. Fans exhausting contaminated air should be
inspected every three months or sooner.

INSTALLATION, OPERATION & MAINTENANCE MANUAL CNW Centrifugal Fiberglass Fan Bulletin 10-02-February 2017
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Troubleshooting
Excessive Noise or Vibration
•Damaged wheel.
•Wheel rubbing inlet; adjust wheel or inlet.
•Verify wheel balance, rebalance if necessary.
•Belts too loose; worn or oily belts.
•Loose fasteners.
•Speed too high.
•Incorrect direction of rotation. Verify that the fan rotates in same direction as the arrows on the motor or belt
drive assembly.
•Bearing collars or hardware loose.
•Bearings need replacement.
•Debris in impeller: clean all dirt off wheel, check wheel balance and rebalance if necessary.
•Fan surge, check for any restrictions to flow into the fan.
•Check alignment of shaft and motor drives.
Low Volume or Pressure
•Incorrect direction of rotation. Verify that the fan rotates in same direction as the arrows on the motor or belt
drive assembly.
•Poor fan inlet or outlet conditions. There should be a straight clear duct at the inlet or outlet. See Inlet &
Outlet Fan Aerodynamic Installation section above.
•Improper wheel alignment.
Motor Problems (Overheating)
•Motor improperly wired.
•Incorrect direction of rotation. Verify that the fan rotates in same direction as the arrows on the motor or belt
drive assembly.
•High horsepower: resize the ductwork. Check proper operation of any dampers. Check filters and access
door.
•Cooling air diverted or blocked.
•Improper inlet clearance.
•Incorrect fan speed.
•Incorrect voltage.
Bearing Problems (Overheating)
•Bearings reaching maximum life, replace bearings.
•Excessive belt tension
•Check for bent shaft.
•Align bearings.

INSTALLATION, OPERATION & MAINTENANCE MANUAL CNW Centrifugal Fiberglass Fan Bulletin 10-02-February 2017
M.K. Plastics Corp. Montréal, Québec, Canada [phone] www.mkplastics.com Page 11 of 12
Figure 23
CNW Belt Drive Arrangement #10 Parts List
Figure 24
CNW Direct Drive Arrangement #4 Parts List

INSTALLATION, OPERATION & MAINTENANCE MANUAL CNW Centrifugal Fiberglass Fan Bulletin 10-02-February 2017
M.K. Plastics Corp. Montréal, Québec, Canada [phone] www.mkplastics.com Page 12 of 12
Warranty
M.K. Plastics will not be responsible for damage to equipment or materials through improper installation, storage, improper
servicing, or through attempts to operate it in excess of its rated capacity or recommended use, intentional or otherwise. We will
not be responsible for consequential damage.
Based on the fact that M.K. Plastics has no direct control over the actual handling and use of its products in the field,
M.K. Plastics does not assume any liability for any loss to the customer or any personnel or any physical damages that are
claimed by anyone due to a failure or cause attributed to the use of its products. In no event shall M.K. Plastics be responsible
for consequential damages of any such defective material or workmanship, including but not limited to the buyer’s loss of material
or profit, increase expense of operation, downtime or reconstruction of the work and in no event shall M.K. Plastics obligation
under this warranty exceed the original contract price of the defective item.
M.K. Plastics warrants its equipment, products and parts, to be free from defects in workmanship and material under normal use
and service for one (1) year after delivery to the first user. Our obligation under this warranty being limited to repairing or
replacing, at our option, without cost at our factory any part, or parts which shall, within such warranty period, be returned to us
with transportation charges prepaid, and which our examination shall disclose to our satisfaction to have been defective.
M.K. Plastics will not beresponsible for the cost of removal of a defective product or parts or the installationof areplaced product or
parts, or for costs due for its removal, crating or shipping.
On account of variables including but not limited to, vibration, system noise characteristics, motor overloading or change in
voltage condition, the specifics of customer application of equipment or other system conditions, M.K. Plastics does not expressly
warrant its equipment for any specific purpose.
The customer and its agents are responsible for the selection and application of M.K. Plastics products, including their fitness for
the purpose and performance intended. Consequently, the customer on behalf of its agents assumes all liability related to the
use/misuse, application and selection of the M.K. Plastics Products.
Bulletin 10-02-February 2017
4955 de Courtrai Ave., Montréal, Québec, H3W 1A6 ● TEL: [phone]
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Email: [e-mail]