Greenheck CSB User manual

1
®
®
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble,
install, operate or maintain the product described. Protect yourself and others by observing all safety information.
Failure to comply with these instructions will result in voiding of the product warranty and may result in personal
injury and/or property damage.
Centrifugal Single-Width Blower
Document 484640
Model CSB
Only qualified personnel should install this unit.
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. Other
considerations may be required if high winds or seismic
activity are present. If more information is needed,
contact a licensed professional engineer before
moving forward.
1. Follow all local electrical and safety codes, as well
as the National Electrical Code (NEC), the National
Fire Protection Agency (NFPA), where applicable.
2. The rotation of the wheel is critical. It must be
free to rotate without striking or rubbing any
stationary objects.
3. Motor must be securely and adequately grounded.
4. Do not spin fan wheel faster than the maximum
cataloged fan RPM. Adjustments to fan speed with
Variable Frequency Drives (VFD) may affect motor
load. If the fan RPM is changed, the motor current
should be checked to make sure it is not exceeding
the motor nameplate amps.
5. Do not allow the power cable to kink or come in
contact with oil, grease, hot surfaces or chemicals.
Replace cord immediately if damaged.
6. Verify that the power source is compatible with
the equipment.
7. Never open access doors to a duct while the fan
is running.
DANGER
Always disconnect power before working on or near
a unit. Lock and tag the disconnect switch or breaker
to prevent accidental power up.
CAUTION
When servicing the unit, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.
Model CSB Centrifugal Single Width Blower
The single-width centrifugal blower is designed for supply,
exhaust or return air installations. Performance capabilities range
up to 17,000 cmh and up to 5.8 in. wg. of static pressure.
CSB fans are available in 8 sizes with wheel diameters ranging
from 315 - 710 mm. Each fan shall bear a permanently affixed
manufacturer’s engraved metal nameplate containing the model
number and individual serial number.
General Safety Information

2Centrifugal Single-Width Blower
®
Receiving
Upon receiving the product, check to ensure all items
are accounted for by referencing the delivery receipt or
packing list. Inspect each crate or carton for shipping
damage before accepting delivery. Alert the carrier
of any damage detected. The customer will make
a notation of damage (or shortage of items) on the
delivery receipt and all copies of the bill of lading which
is countersigned by the delivering carrier. If damaged,
immediately contact your local sales representative.
Any physical damage to the unit after acceptance is
not the responsibility of manufacturer.
Unpacking
Verify that all required parts and the correct quantity
of each item have been received. If any items are
missing, report shortages to your local representative
to arrange for obtaining missing parts. Sometimes it
is not possible that all items for the unit be shipped
together due to availability of transportation and truck
space. Confirmation of shipment(s) must be limited to
only items on the bill of lading.
Handling
Fans are to be rigged and moved by the lifting brackets
provided or by the skid when a forklift is used. Location
of brackets varies by model and size. Handle in such
a manner as to keep from scratching or chipping the
coating. Damaged finish may reduce the ability of the
fan to resist corrosion. Fans should never be lifted by
the shaft, fan housing, motor, belt guard, windband
or accessories.
Storage
• Rotate fan wheel monthly and purge bearings once
every three months
• Energize fan motor once every three months
• Store belts flat to keep them from warping
and stretching
• Store unit in a location which does not
have vibration
• After storage period, purge grease before putting
fan into service.
If storage of fan is in a humid, dusty or corrosive
atmosphere, rotate the fan and purge the bearings
once a month. Improper storage which results in
damage to the fan will void the warranty.
Fans are protected against damage during shipment. If
the unit cannot be installed and operated immediately,
precautions need to be taken to prevent deterioration
of the unit during storage. The user assumes
responsibility of the fan and accessories while in
storage. The manufacturer will not be responsible
for damage during storage. These suggestions are
provided solely as a convenience to the user.
INDOOR - The ideal environment for the storage of
fans and accessories is indoors, above grade, in a
low humidity atmosphere which is sealed to prevent
the entry of blowing dust, rain or snow. Temperatures
should be evenly maintained between 30° to 110°F
(-1° to 43°C), wide temperature swings may cause
condensation and “sweating” of metal parts. All
accessories must be stored indoors in a clean, dry
atmosphere.
Remove any accumulations of dirt, water, ice, or snow
and wipe dry before moving to indoor storage. To avoid
“sweating” of metal parts allow cold parts to reach room
temperature. To dry parts and packages, use a portable
electric heater to remove any moisture build up. Leave
coverings loose to permit air circulation and to allow for
periodic inspection.
The unit should be stored at least 3½ inches (89 mm)
off the floor on wooden blocks covered with moisture
proof paper or polyethylene sheathing. Aisles between
parts and along all walls should be provided to permit
air circulation and space for inspection.
OUTDOOR - Fans designed for outdoor applications
may be stored outdoors, if absolutely necessary. Roads
or aisles for portable cranes and hauling equipment
are needed.
The fan should be placed on a level surface to prevent
water from leaking into the fan. The fan should be
elevated on an adequate number of wooden blocks
so it is above water and snow levels and has enough
blocking to prevent it from settling into soft ground.
Locate parts far enough apart to permit air circulation,
sunlight and space for periodic inspection. To minimize
water accumulation, place all fan parts on blocking
supports so rain water will run off.
Do not cover parts with plastic film or tarps as these
cause condensation of moisture from the air passing
through heating and cooling cycles.
Fan wheels should be blocked to prevent spinning
caused by strong winds.
Inspection and Maintenance During
Storage
While in storage, inspect fans once per month. Keep a
record of inspection and maintenance performed.
If moisture or dirt accumulations are found on parts,
the source should be located and eliminated. At
each inspection, rotate the wheel by hand ten to
fifteen revolutions to distribute lubricant in motor and
bearings. If paint deterioration begins, consideration
should be given to touch-up or repainting. Fans with
special coatings may require special techniques for
touch-up or repair.
Machined parts coated with rust preventive should be
restored to good condition promptly if signs of rust
occur. Immediately remove the original rust preventive
coating with petroleum solvent and clean with lint-
free cloths. Polish any remaining rust from surface
with crocus cloth or fine emery paper and oil. Do not
destroy the continuity of the surfaces. Thoroughly wipe
clean with Tectyl®506 (Ashland Inc.) or the equivalent.
For hard to reach internal surfaces or for occasional
use, consider using Tectyl®511M Rust Preventive,
WD-40®or the equivalent.

3
Centrifugal Single-Width Blower
®
Removing from Storage
As fans are removed from storage to be installed in
their final location, they should be protected and
maintained in a similar fashion until the fan equipment
goes into operation.
Prior to assembly and installation of the unit and system
components, inspect the fan assembly to make sure it is
in working order.
1. Check all fasteners, set screws on the fan, wheel,
bearings, drive, motor base and accessories
for tightness.
2. Rotate the fan wheel by hand and assure no parts
are rubbing.
3. Ensure wheel backplate is equidistant from inlet cone
ID on both sides (in case of double-wide wheel) for
proper wheel centering.
Table of Contents
System Set-Up ............................. 4
Installation
Discharge Positions ........................ 5
Method for Wheel Centering ................. 5
V-Belt Drive Installation ..................... 5
Alignment of Pulleys and Belts ............... 5
Wheel Rotation............................ 5
Unit Start-Up
Visual Inspection of Equipment ............... 6
Check ................................... 6
Additional Steps for Initial Start-Up............ 6
Vibration ................................. 6
Routine Maintenance and Operation
Fan Operation ............................ 7
Belt Drive Maintenance ..................... 7
Bearing Lubrication Schedule ................ 8
Wheel and Fastener Maintenance ............. 8
Bearing Replacement
Bearing Removal .......................... 9
Bearing Installation ........................ 9
Motors .................................... 9
Troubleshooting............................ 10
Maintenance Log........................... 11
Our Commitment........................... 12

4Centrifugal Single-Width Blower
®
Ducted Outlet Installations
Discharge Duct Turns - Duct turns located near the
fan discharge should always be in the direction of the
fan rotation.
Fan performance is reduced when duct turns are
made immediately off the fan discharge.
To achieve cataloged fan performance
there should be at least
three equivalent
duct diameters of
straight ductwork
between the fan
discharge and
any duct turns.
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Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POORGOOD
Length of Straight Duct
GOOD
Three fan wheel diameters
One fan
wheel
diameter
3/4 to
one fan
wheel
diameter
One fan
diameter
3/4 to
one fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
STATIC PRESSURE LOSS
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 5 10 15 20 25 30 35 40 45
FPM X 100
OUTLET VELOCITY
CURVE 1
CURVE 2
CURVE 3
CURVE 4
Non-Ducted Installations
Inlet Clearance - Installation of a fan with an open
inlet too close to a wall or bulkhead will cause reduced
fan performance. It is desirable to have a minimum of
three-fourths of a wheel diameter between the fan inlet
and the wall.
Free Discharge - Free or abrupt discharge into a
plenum results in a reduction in fan performance. The
effect of discharge static regain is not realized.
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Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POORGOOD
Length of Straight Duct
GOOD
Three fan wheel diameters
One fan
wheel
diameter
3/4 to
one fan
wheel
diameter
One fan
diameter
3/4 to
one fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
STATIC PRESSURE LOSS
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 5 10 15 20 25 30 35 40 45
FPM X 100
OUTLET VELOCITY
CURVE 1
CURVE 2
CURVE 3
CURVE 4
Single Fan Installation
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Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POORGOOD
Length of Straight Duct
GOOD
1 Fan
Wheel
Diameter
3/4 to one
fan
wheel
diameter
3/4 to one
fan
wheel
diameter
3/4 to one
fan
wheel
diameter
One fan
diameter
3/4 to one
fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
STATIC PRESSURE LOSS
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 5 10 15 20 25 30 35 40 45
FPM X 100
OUTLET VELOCITY
CURVE 1
CURVE 2
CURVE 3
CURVE 4
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Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POORGOOD
Length of Straight Duct
GOOD
Three fan wheel diameters
One fan
wheel
diameter
3/4 to
one fan
wheel
diameter
One fan
diameter
3/4 to
one fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
STATIC PRESSURE LOSS
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 5 10 15 20 25 30 35 40 45
FPM X 100
OUTLET VELOCITY
CURVE 1
CURVE 2
CURVE 3
CURVE 4
Parallel Fan Installation
System Set-Up
Installations with inlet or discharge configurations that
deviate from this manual may result in reduced fan
performance. Restricted or unstable flow at the fan
inlet can cause pre-rotation of incoming air or uneven
loading of the fan wheel, yielding large system losses,
increased sound levels and structural failure of the fan
wheel. Free turbulent flow in the discharge ductwork
will also result in system effect losses. Refer to the
following diagrams for the most efficient installation
conditions.
Ducted Inlet Installations
Inlet Duct Turns - Installation of a duct turn or elbow
too close to the fan inlet
reduces fan performance
because air is loaded
unevenly into the fan
wheel. To achieve full fan
performance, there should
be at least three fan wheel
diameters between the
turn or elbow and the
fan inlet.
Inlet Spin - Inlet spin is a frequent cause of reduced
fan performance. The change in fan performance is a
function of the intensity of spin and not easily defined.
The best solution is proper duct design and airflow
patterns. Turning vanes reduce the effects of inlet spin.
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Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POOR
GOOD
Length of Straight Duct
GOOD
Three fan wheel diameters
One fan
wheel
diameter
3/4 to
one fan
wheel
diameter
One fan
diameter
3/4 to
one fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
STATIC PRESSURE LOSS
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 5 10 15 20 25 30 35 40 45
FPM X 100
OUTLET VELOCITY
CURVE 1
CURVE 2
CURVE 3
CURVE 4
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Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POOR
GOOD
Length of Straight Duct
GOOD
Three fan wheel diameters
One fan
wheel
diameter
3/4 to
one fan
wheel
diameter
One fan
diameter
3/4 to
one fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
STATIC PRESSURE LOSS
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 5 10 15 20 25 30 35 40 45
FPM X 100
OUTLET VELOCITY
CURVE 1
CURVE 2
CURVE 3
CURVE 4
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Turning
Vanes
Turning
Vanes
POOR
POOR
GOOD
POORGOOD
Length of Straight Duct
GOOD
Three fan wheel diameters
One fan
wheel
diameter
3/4 to
one fan
wheel
diameter
One fan
diameter
3/4 to
one fan
wheel
diameter
SYSTEM EFFECT FACTORS CURVES
STATIC PRESSURE LOSS
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 5 10 15 20 25 30 35 40 45
FPM X 100
OUTLET VELOCITY
CURVE 1
CURVE 2
CURVE 3
CURVE 4

5
Centrifugal Single-Width Blower
®
Installation
Move the fan to the desired location. Check and
tighten fasteners throughout the unit and then fasten
securely through mounting holes provided in the base
angles. The unit must be set level (shimming may be
necessary). Flexible duct connections and vibration
isolators should be used where noise is a factor.
The motor voltage and ampere rating must be checked
for compatibility with the electrical supply prior to final
electrical connection. Supply wiring to the fan must
be properly fused, and conform to local and national
electrical codes.
The discharge is factory set as specified by customer
order, however, certain sizes can be rotated to other
discharge positions in the field if necessary. If rotating
the fan housing, accommodations may need to be
made for the fan to drain properly. Removal of the
housing bolts allows the discharge to be rotated to the
clockwise positions above. For DB discharge position,
a portion of the frame angle must be removed.
Fan rotation is always specified from the drive side of
the housing.
Discharge Positions
To avoid motor overheating and possible burnout,
motor load amperes should always be checked and
compared to nameplate rating when fan speed is
increased.
Alignment of Pulleys and Belts
Check pulleys and belts for proper alignment to avoid
unnecessary belt wear, noise, vibration and power
loss. Motor and drive shafts must be parallel and
pulleys in line as shown in Figure 1.
Do not force belt(s). Forcing the
belt(s) will break the cords and
cause belt failure
Deflection = Belt Span
64
Slack
Side
Belt
Span
CORRECT WRONG
WRONG WRONG
CORRECT WRONG WRONG WRONG
Figure 1
V-Belt Drive Installation
1. Remove the protective coating from the end of the
fan shaft using mineral spirits or another similar
solvent. Check to ensure that the shaft is free of
nicks and burrs.
2. Slide sheaves on shafts. Do not drive sheaves on
as this may result in bearing damage.
3. Align fan and motor sheaves with a
straight edge or string and tighten.
4. Place belts over sheaves. Do
not pry or force belts, as this
could result in damage to
the cords in the belts.
5. Adjust the tension until
the belts appear snug.
Run the unit for a few
minutes and allow the
belts to “set” properly.
6. With the fan off and disconnect locked out, adjust
the belt tension by moving the motor pivot plate.
When in operation, the tight side of the belts should
be in a straight line from sheave to sheave with a
slight bow on the slack side.
FANMOTOR FAN
MOTOR
Aligning Sheaves with
a Straight Edge
Wheel Rotation
Rotation direction of the wheel is critical. Incorrect
rotation will result in reduced air performance,
increased motor loading and possible motor burnout.
Check wheel rotation by momentarily energizing the
unit and noting if rotation
is in the same direction
as the airflow at the outlet
and conforms to the
rotation decal affixed to
the unit.
Wheels as viewed from
the drive side:
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Backward Inclined
Forward Curved
Airflow
Airflow
Backward Inclined Forward Curved
Airflow
Airflow
These are the original drawings on the Illustrator file
when I opened it. The IOM had the wheel layered on
top of the scroll.
I will incorporate the
wheel on the scroll
without creating
an additional
layer in the
InDesign file.
April 19, 2011
I positioned the wheels onto the scroll outline. The forward curved wheel was mirrored and
positioned on the scroll above. This is how was done in the InDesign Utility Fans IOM file.
The wheel was laid on top of the scroll within the InDesign file. Better to do this within Illustrator.
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Airflow
Airfoil
Centrifugal
Backward Inclined
Forward CurvedAirfoil
TH UB BH
Method for Centering Wheel
On belt drive units, centering can be accomplished
by (a) loosening the inlet cone bolts to move the inlet
cone or by (b) loosening the bearings in order to
move the shaft. Wheel and inlet cone overlap can be
adjusted by loosening the wheel hub set screws and
moving the wheel to the desired position. Tighten all
fasteners and set screws securely and realign drive
pulleys after adjustment.

6Centrifugal Single-Width Blower
®
Unit Start-Up
Visual Inspection of Equipment
The equipment type and arrangement should be
verified as ordered at once when it arrives at the
job site. When a discrepancy is found, the local
representative must be notified immediately so that
corrective action may be investigated, also verify
electrical conformance to specifications. Unauthorized
alterations and unauthorized backcharges will not be
recognized by the fan manufacturer.
After the unit has been assembled, installed and all
utilities have been hooked up, the unit is now ready for
operation.
Check
Before starting the unit, check the following:
1. Disconnect and lock-out all power switches to fan.
2. Check all fasteners, set screws and locking collars
on the fan, bearings, drive, and accessories for
tightness.
3. Rotate the fan wheel by hand and assure no parts
are rubbing.
4. Check for bearing alignment and lubrication.
5. Check the V-belt drive for proper alignment and
tension.
6. Check all guarding (if supplied) for being securely
attached and not interfering with rotating parts.
7. Check operation of variable inlet vanes or
discharge dampers (if supplied) for freedom of
movement.
8. Check all electrical connections for proper
attachment.
9. Check housing and ductwork, if accessible,
for obstructions and foreign material that may
damage the fan wheel.
WARNING
Disconnect and secure to the OFF position all
electrical power to the fan prior to inspection
or servicing. Failure to comply with this safety
precaution could result in serious injury or death.
Additional Steps for Initial Start-Up
1. Check for proper wheel rotation by momentarily
energizing the fan. Access to view the wheel can be
gained through the blower housing access panel.
One of the most frequently encountered problems
are motors that are wired to rotate the wheel in the
wrong direction. This is especially true with 3-phase
installations where the motor will run in either
direction, depending on how it has been wired. To
reverse rotation of a 3-phase motor, interchange
any two of the three
electrical leads. Single
phase motors can be
reversed by changing
internal connections
as described on the
motor label or wiring
diagram.
2. Fans with multi-speed motors should be checked
on low speed during initial start-up.
3. Check for unusual noise, vibration or overheating of
bearings. Refer to the “Troubleshooting” section of
this manual if a problem develops.
4. Grease may be forced out of the bearing seals
during initial start-up. This is a normal self-purging
feature for the type of bearing used on this product.
Vibration
On start-up and during operation, the unit should
operate smoothly with minimal vibration. It is possible
that a higher degree of vibration may be experienced.
Excessive vibration if left unchecked, can cause a
multitude of problems, including structural and/or
component failure. The most common sources of
vibration are listed.
Many of these
conditions can
be discovered by
careful observation.
Refer to the
troubleshooting
section of this
manual for
corrective actions. If
observation cannot
locate the source of
vibration, a qualified technician using vibration analysis
equipment should be consulted. If the problem is
wheel unbalance, in-place balancing can be done
through the access panel located on the side of each
fan’s tubular housing. Any correction weights added to
the wheel should be welded to either the wheel back
(single-plane balance) or to the wheel back and wheel
cone (two-plane balance).
Common Sources of Vibration
1. Wheel Unbalance
2. Drive Pulley Misalignment
3. Incorrect Belt Tension
4. Bearing Misalignment
5. Mechanical Looseness
6. Faulty Belts
7. Drive Component Unbalance
8. Poor Inlet/Outlet Conditions
9. Foundation Stiffness
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Backward Inclined
Forward Curved
Airflow
Airflow
Backward Inclined Forward Curved
Airflow
Airflow
These are the original drawings on the Illustrator file
when I opened it. The IOM had the wheel layered on
top of the scroll.
I will incorporate the
wheel on the scroll
without creating
an additional
layer in the
InDesign file.
April 19, 2011
I positioned the wheels onto the scroll outline. The forward curved wheel was mirrored and
positioned on the scroll above. This is how was done in the InDesign Utility Fans IOM file.
The wheel was laid on top of the scroll within the InDesign file. Better to do this within Illustrator.
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Airflow
Airfoil
Centrifugal
Backward Inclined
Forward CurvedAirfoil

7
Centrifugal Single-Width Blower
®
Routine Maintenance and
Operation
Once the unit has been put into operation, a routine
maintenance schedule should be set up to accomplish
the following:
1. Lubrication of bearings and motor.
2. Wheel, housing, bolts and set screws on the entire
fan should be checked for tightness.
3. Any dirt accumulation on the wheel or in the
housing should be removed to prevent unbalance
and possible damage.
4. Inspect fan impeller and housing looking for fatigue,
corrosion, or wear.
Fan Operation
All fans should be run every thirty (30) days, or at least
“bumped” every thirty days. It is preferred that each
fan is run as this causes all electrical and mechanical
components to get up to temperature, displacing any
formed condensation, redistributes load on bearings,
and redistributes grease in the bearings (motor and
shaft bearings).
CAUTION
When operating conditions of the fan are to be
changed (speed, pressure, temperature, etc.),
consult manufacturer to determine if the unit can
operate safely at the new condition.
CAUTION
When performing any service to the fan, disconnect
the electrical supply and secure fan impeller.
Belt Drive Maintenance
V-belt drives must be checked on a regular basis
for wear, tension, alignment and dirt accumulation.
Premature or frequent belt failures can be caused by
improper belt tension (either too loose or too tight)
or misaligned sheaves. Abnormally high belt tension
or drive misalignment will cause excessive bearing
loads and may result in failure of the fan and/or motor
bearings. Conversely, loose belts will cause squealing
on start-up, excessive belt flutter, slippage and
overheated sheaves. Either excessively loose or tight
belts may cause fan vibration.
When replacing V-belts on multiple groove drives
all belts should be changed to provide uniform
drive loading. Use a set of matched belts whenever
possible. Do not pry belts on or off the sheave. Loosen
belt tension until belts can be removed by simply lifting
the belts off the sheaves. After replacing belts, ensure
that slack in each belt is on the same side of the drive.
Belt dressing should never be used.
Do not install new belts on worn sheaves. If the
sheaves have grooves worn in them, they must be
replaced before new belts are installed.
The proper tension for operating a V-belt drive is
the lowest tension at which the belts will not slip at
peak load conditions. Belts are adjusted by raising or
lowering the motor
pivot plate. For
initial tensioning,
the proper
belt deflection
halfway between
sheave centers is
1/64-inch for each
inch of belt span.
For more information about measuring belt tension,
refer to Greenheck’s Product Application Guide,
FA/127-11, Measuring Belt Tension, found online at
www.greenheck.com in the library section.
Check belt tension two times during the
first 24hours of operation and periodically
thereafter.
Belt Span
Deflection = Belt Span
64

8Centrifugal Single-Width Blower
®
Recommended Bearing Lubrication Schedule
Relubrication Schedule in Months
Standard Grease
Fan
RPM
Bearing Bore (mm)
20 - 25 30 - 35 40 - 45 50 - 55 60 - 65
To 250 12 12 12 12 12
500 12 12 11 10 8
750 12 9 8 7 6
1000 12 7 6 5 4
1250 12 6 5 4
1500 12 5 4 3
2000 12 3 3 2
2500 12 2 2
3000 12 2
3500 12
4000 12
5000 12
Replenishing
Quantity
(gms)
2.5 4.5 6 8 10.5
Bearing Lubrication Schedule
Shaft bearings are the most critical moving part of a
fan. Therefore, special attention should be given to
keeping the bearings clean and well lubricated. Proper
lubrication provides for reduction in friction and wear,
transmission and dissipation of heat, extended bearing
life and prevention of rust.
In order for a lubricant to fulfill these tasks, the proper
grease applied at regular intervals is required. See the
recommended bearing lubrication schedule below.
• Lubrication interval is based on 12 hour per day
operation and maximum 80°C housing temperature. For
24 hour per day operation, the interval should be cut in
half.
• Lubricant should be added with the shaft rotating and
until clean grease is seen purging from the bearing.
The lubrication interval may be modified based on the
condition of the purged grease. If bearing is not visible to
observe purged grease, lubricate with number of shots
indicated in chart for bore size.
• For conditions including high temperatures, moisture, dirt
or excessive vibration, consult the factory for a specific
lubrication interval for your application.
• Factory recommends VT307 lubricant.
In addition to lubricating the bearings at specified
intervals, adapter sleeves and locking collar should
be checked for tightness. A bearing collar which has
loosened will cause premature failure of the fan shaft.
Fasteners attaching the bearings to the drive frame
should also be checked.
Wheel and Fastener Maintenance
Wheels require very little attention when exhausting
clean air, however, air heavily laden with grease or
dirt will tend to accumulate on the wheel causing
unbalance. Wheels exhausting dirty or grease-laden air
require frequent cleaning to assure smooth and safe
operation.
All fasteners, including set screws in the bearing
collars, should be checked for tightness each time
maintenance checks are performed.
A proper maintenance program will help preserve the
performance and reliability designed into the fan.

9
Centrifugal Single-Width Blower
®
The intent of this procedure is to allow a field service
technician to replace bearings with the fan remaining
in place in its intended application. All work can
be conducted by accessing the bearings by either
removing a shaft guard, a weatherhood or working
under a weatherhood (if applicable). This is dependent
on the size of the unit. This procedure assumes the
power source has been locked out prior to removing
guards and covers, belts and pulleys have been
loosened and removed properly and extended
lubrication lines have been disconnected at the
bearing. In some cases, it may be necessary to remove
the fan inlet cone and wheel if the bearings cannot be
removed due to corrosion or damage.
Bearing Removal
This procedure assumes proper safety measures have
been taken.
• Read and follow all instructions carefully.
• Disconnect and lockout power before installation
and maintenance.
• Driven sheaves and belts have already
been removed.
• Arr. 3 fans (if applicable) will need the inlet ducting
removed to access the non-drive bearing removal.
• Shaft black coating can be removed with a solvent
similar to a brake/carburetor cleaner.
1. Scribe a line around the shaft by both bearings
and around the bearing base to the bearing
support or write down the measurement from the
end of the shaft to the bearings. This will help in
repositioning the new bearing and wheel cone
overlap.
2. Follow the bearing manufacturers’ procedures for
removal and installation.
3. Before removing the bearing bolts, make sure the
shaft is supported slightly. Remember to consider
the wheel weight on the shaft. (Arr. 3 may need
the wheel to be suspended through an access
door on top of the fan.)
4. Remove both bearings from the shaft and clean/
remove any burrs using an emery cloth or file.
5. Clean mounting surface of any dirt or grease.
Bearing Installation
1. Before installing, read bearing manufacturers’
procedures. Before putting the new bearings on
the shaft, you may need to break what is called
swivel torque on the bearings (depending on style
of bearing). This is done by holding the bearing
housing securely and being able to move the inner
bearing race around freely.
2. Apply light film of oil on shaft, then gently slide the
new bearings onto the shaft.
Do not hammer bearing onto shaft!
3. Align bearings on shaft with the previous scribe
marks that are on the shaft and lock bearing to
shaft.
4. Put bolts into mounting surface and bearings. Do
not tighten.
5. Remove blocks if shaft is supported. (Arr. 3
release the weight of the wheel onto the bearing).
6. Set bearings on support with the scribed marks
locating the bearings. Make sure bearings are
square and level with the shaft.
7. Tighten bolts and torque bearing bolts, bearing
set screws/locking collars as per bearing
manufacturers’ procedures.
8. Rotate shaft by hand to help allow the bearings to
help set in. Also at this time, listen for any unusual
noises such as wheel rubbing on cone and any
bearing noise.
9. Connect extended lube lines in new bearings if
needed.
10. Reinstall the drive sheaves and belts. Check the
belt alignment.
11. Make sure to reinstall all guards and follow proper
safety measures before starting up the fan.
Bearing Replacement
Motor maintenance is generally limited to cleaning
and lubrication. Cleaning should be limited to exterior
surfaces only. Removing dust and grease buildup on
the motor housing assists proper motor cooling. Never
wash-down motor with high pressure spray.
Greasing of motors is only intended when fittings are
provided. Many motors are permanently lubricated for
life and require no further lubrication. Motors supplied
with grease fittings should be greased in accordance
with the motor manufacturer’s recommendations.
Consult fan manufacturer for instructions on the
removal of replacement motors.
It is recommended to select VFD compatible motors
for CSB fans and connect the motors through a VFD
controller to avoid sudden torque on the impeller, and
the belts ensuring soft start and safe operation.
Motors

10 Centrifugal Single-Width Blower
®
WARNING
Before taking any corrective action, make certain
unit is not capable of operation during repairs.
Troubleshooting
Problem Cause Corrective Action
Excessive Noise
Wheel Rubbing Inlet Adjust wheel and/or inlet cone.
Tighten wheel hub or bearing collars on shaft.
V-Belt Drive
Tighten sheaves on motor/fan shaft. Adjust belt tension.
Align sheaves properly (see procedure).
Replace worn belts or sheaves.
Bearings Replace defective bearing(s). Lubricate bearings.
Tighten collars and fasteners.
Wheel Unbalance Clean all dirt off wheel. Check wheel balance.
Low CFM Fan Check wheel for correct rotation.
Duct System Higher pressure than design. Filters need replacement.
High CFM
Fan Decrease fan speed.
Duct System Resize ductwork. Access door, filters, dampers not
installed.
Static Pressure Wrong
Duct system has more
or less restriction than
anticipated
Remove obstructions in system. Use correction factor to
adjust for temperature/altitude. Resize ductwork. Clean
filters/coils. Change fan speed.*
High Motor Amp Draw
Fan Check rotation of wheel. Reduce fan speed.
Duct System Resize ductwork. Check proper operation of isolation and
bypass dampers. Check filters and access doors.
Fan Doesn’t Operate
Electrical Supply Check fuses/circuit breakers. Check for switches turned
off or disconnected. Check for correct supply voltage.
Drive Check for broken belts. Tighten loose pulleys.
Motor Assure motor is correct horsepower and not tripping
overload protector.
Overheated Bearing
Lubrication Check for excessive or insufficient grease in the bearing.
Mechanical Replace damaged bearing. Relieve excessive belt tension.
Align bearings. Check for bent shaft.
Excessive Vibration
Belts Adjust tightness of belts. Replacement belts should be a
matched set.
System Unbalance
Check alignment of shaft, motor and pulleys. Adjustable
pitch pulleys with motors over 15 hp are especially
prone to unbalance. Check wheel balance, rebalance if
necessary.
* Always check motor amps and compare to nameplate rating. Excessive fan speed may overload the motor
and result in motor failure. Do not exceed the maximum cataloged rpm of the fan.

11
Centrifugal Single-Width Blower
®
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12
As a result of our commitment to continuous improvement, Greenheck reserves the right to change
specifications without notice.
Specific Greenheck product warranty is found in the Model Specification located on greenheck.com.in within
the product area tab and in the Technical Data Library.
®
[email protected] • www.greenheck.co.in • www.greenheck.com
Our Commitment
AMCA Publication 410-96, Safety Practices for Users and Installers of Industrial and Commercial Fans, provides additional
safety information. This publication can be obtained from AMCA International, Inc. at www.amca.org.
484640 • CSB, Rev. 1, June 2020 Copyright © 2020 Greenheck India Private Limited