Accurex XUEB-200 Operator’s Manual

Document 470312

Model XUEB - Series 100 and 200

Centrifugal Utility Fans

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 instructions could result in personal injury and/or property damage!

Series 100

Series 200

General Safety Information

Only qualified personnel should install this 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.
Other considerations may be required if seismic
activity is 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) and the
National Fire Protection Agency (NFPA), where
applicable. Follow the Canadian Electric Code
(CEC) in Canada.

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 max cataloged
fan RPM. Adjustment to fan speed significantly
affects 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, lock and tag power source
before installing or servicing. Failure to disconnect
power source can result in fire, shock or serious
injury.

CAUTION

When servicing the fan, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.

CAUTION

Precaution should be taken in explosive
atmospheres.

DANGER

Pour écarter les risques d’incendie, de choc
électrique ou de blessure grave, veiller à toujours
débrancher, verrouiller et étiqueter la source de
courant avant l’installation ou l’entretien.

ATTENTION

Lors de toute intervention sur la soufflante, le moteur
peut être suffisamment chaud pour provoquer
une douleur voire une blessure. Laisser le moteur
refroidir avant toute maintenance.

ATTENTION

Faire preuve de précaution dans les atmosphères
explosives.

Centrifugal Utility Fans 1

Table of Contents

General Safety Information .................... 1

Receiving, Unpacking, Storage, Inspection ....... 3

Installation

Discharge Positions ........................ 4

UL/cUL 762 for Restaurant Exhaust ............. 4

Effect of Installation on Performance ............ 5

Pre-Starting Checks

Alignment of Pulleys and Belts ................ 5

Wheels and Wheel Rotation .................. 6

Mounting for Severe Duty Installation ............ 7

Maintenance
Tapered Bushing Hub Installation and Removal ... 8

Bearing Lubrication Schedule ................. 9

Motor Maintenance ......................... 8

Wheel and Fastener Maintenance ............. 9

Belt Maintenance .......................... 9

Installation of Motor, Drives and Belt(s) ......... 10

Parts List ................................. 11

Troubleshooting ............................ 12

Our Commitment ........................... 12

Centrifugal Utility Fans2

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 Accurex
Representative. Any physical damage to the unit after
acceptance is not the responsibility of Accurex LLC.

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.

Storage

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 -

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
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.

The ideal environment for the storage of

(89 mm)

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 lint­free 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.

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.

Centrifugal Utility Fans 3

Installation

Inspect the unit for any damage and report it to
the shipper immediately. Also, check to see that all
accessory items are accounted for.

Move the fan to the desired location and 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, it can be rotated to other discharge
positions in the field if necessary. Removal of the
housing bolts allows the discharge to be rotated to
the clockwise positions below. For TAD, DB and BAD
discharge positions, a portion of the frame angle must
be removed.

Clockwise rotation shown. Counterclockwise
discharge positions are a mirror image of those
shown. Fan rotation is always specified from the drive
side of the housing.

Discharge Positions

Installation of UL/cUL 762 Listed
Fans for Restaurant Exhaust

The UL/cUL 762 listing for restaurant exhaust is
available on model XUEB Series 200, sizes 206 - 224,
with a weatherhood.

UL/cUL 762 fans are listed for a maximum operating
temperature of 375°F
door and 1inch

(191°C)

(25.4mm)

outlet guard is strongly recommended when the fan
discharge is accessible. An upblast discharge is
recommended. The fan discharge must be a minimum
of 40 inches

(1016 mm)

exhaust duct must be fully welded to a distance of
18inches

40 in.**

(1016 mm)

**Per NFPA 96 the fan discharge must
be a minimum of 40 in. (1016 mm)
above the roof surface.

This drawing is for dimensional information only. See the latest edition
of NFPA 96 Standard for Ventilation Control and Fire Protection of
Commercial Cooking Operations for detailed installation instructions,
materials, duct connections and clearances.

(457mm)

Upblast Discharge

Weatherhood

above the roof surface.

and includes an access

drain connection. An

above the roof line and the

XUEB Series 200 models are listed for
grease removal (UL/cUL 762)
File no. MH11745

Optional Companion
Flange

3 Wheel

Diameters

Duct
from

kitchen

hood

18 in.*

(457 mm)

*Per NFPA 96 the duct
must be of all-welded
construction to a
minimum distance of
18 inches (457 mm)
above the roof surface.

CW BH CW BAU CW TAUCW UB

CW TH CW TAD

CW DB

CW BAD

Centrifugal Utility Fans4

Effect of Installation on
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 discharge or turbulent flow in the discharge
ductwork will also result in system effect losses.

These examples show the system layout and inlet
and discharge configurations which can affect fan
performance.

7o MAX.

POOR

POOR

POOR

POOR

Turning

Varies

FAIR

POOR

FAIR

FAIR

One

Impeller

Dia.

GOOD

FAIR

Should be at least
1/2 Impeller Dia.

GOOD

GOOD

Pre-Starting Checks

DANGER

Always disconnect, lock and tag power source
before installing or servicing. Failure to disconnect
power source can result in fire, shock or serious
injury.

CAUTION

When servicing the fan, motor may be hot enough
to cause pain or injury. Allow motor to cool before
servicing.

CAUTION

Precaution should be taken in explosive
atmospheres.

DANGER

Pour écarter les risques d’incendie, de choc
électrique ou de blessure grave, veiller à toujours
débrancher, verrouiller et étiqueter la source de
courant avant l’installation ou l’entretien.

ATTENTION

Lors de toute intervention sur la soufflante, le moteur
peut être suffisamment chaud pour provoquer
une douleur voire une blessure. Laisser le moteur
refroidir avant toute maintenance.

ATTENTION

Faire preuve de précaution dans les atmosphères
explosives.

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.

CORRECT WRONG WRONG WRONG

POOR

POOR

Not Greater than

o

60

Including Angle

FAIR

Figure 1

The adjustable motor pulley is set at the factory for
the fan RPM specified by the customer. Fan RPM can
be increased by closing or decreased by opening the
adjustable motor pulley. Multigroove variable pitch
pulleys must be adjusted an equal number of turns
open or closed. Any increase in fan speed represents
a substantial increase in load on the motor.

To avoid motor overheating and possible burnout,
motor load amperes should always be checked and
compared to nameplate rating when fan speed is
increased.

Centrifugal Utility Fans 5

R

o

t

a

t

i

o

n

R

o

t

a

t

i

o

n

R

o

ta

t

io

n

R

o

ta

t

io

n

Backward Inclined

Forward Curved

Airflow

Airflow

Backward Inclined Forward Curved

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.

R

o

t

a

t

i

o

n

R

o

t

a

t

i

o

n

Airflow

Airfoil

Wheels

Gap

Wheel

Radial
Gap

Overlap

Wheel

Wheels must rotate freely and
not rub on the inlet venturi.
Model XUEB wheels overlap
the inlet venturi as shown in
Figure 2.

Refer to the Approximate
Wheel Clearance Dimensions
table for the proper
dimensions for wheel overlap
and radial gap.

Approximate Wheel Clearance Dimensions

(10)

(10)

(11)

(13)

(13)

(16)

(16)

(18)

(19)

Overlap

Tolerance

inches (mm)

1

⁄4

1

⁄4

1

⁄4

1

⁄4

1

⁄4

3

(10)

⁄8

3

(10)

⁄8

3

(10)

⁄8

3

(10)

⁄8

XUEB

Series 100

XUEB

Series 200

Overlap

106 206 — — —
107 207 — — —
108 208 — — —

3

110 210

212
113 213
115 215
116 216
118 218
120 220

222
124 224

Method for Centering Wheel

On belt drive units, centering can be accomplished

⁄8

3

⁄8

7

⁄16

1

⁄2

1

⁄2

5

⁄8

5

⁄8

11

⁄16

3

⁄4

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. For wheel
hubs and shaft pulleys utilizing a tapered bushing
interface, reference page 8 for the tapered bushing
removal and move the wheel to the desired position.
Tighten all fasteners and set screws securely and
realign drive pulleys after adjustment.

(6)

(6)

(6)

(6)

(6)

Figure 2

Radial

Gap

5

(4)

⁄32

5

(4)

⁄32

5

(4)

⁄32

5

(4)

⁄32

5

(4)

⁄32

5

(4)

⁄32

5

(4)

⁄32

5

(4)

⁄32

5

(4)

⁄32

Wheel Rotation

Rotation direction of the wheel is critical and 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:

n

o

i

t

a

t

o

R

Backward Inclined

Airflow

Centrifugal Utility Fans6

Mounting for Severe Duty Installation

Isolator Anchoring

One fastener per isolator anchoring.
Four isolators required.

1/2 inch (13 mm) - 13 Bolt

1/2 inch (13 mm) - 13 Bolt
(Four Locations)

(Four Locations)

Equipment Support Anchoring

Two fasteners per equipment support.
Three supports required for model sizes 20 and larger.

5/8 inch (16 mm) Lag Screw

5/8 inch (16 mm) Lag Screw
Min. 1-1/2 inch (38 mm) Thread Engagement

Min. 1-1/2 inch (38 mm) Thread Engagement
(Two per Equipment Support)

(Two per Equipment Support)

18 Ga. Galvanized G90
with Wood Nailer

Three Supports Required
for Sizes 20 and larger

Min. 5 inch

(127 mm)

Isolator Anchoring

3/8 inch (10 mm) S.S. Hilti Kwik Bolt

3/8 inch (10 mm) S.S. Hilti Kwik Bolt
Three Expansion Anchors

Three Expansion Anchors
Min. 2-1/2 inch (64 mm) Engagement

Min. 2-1/2 inch (64 mm) Engagement

2000 Min. PSI
Concrete

Concrete

Deck Anchoring

5/16 inch (8 mm) Self-Drilling Screw
Min. 1/2 inch (13 mm) of Threads Through

Steel

Deck Anchoring

Roof Truss
1/8 inch (3 mm) Thick
or 12 Gauge Min.

Wood Timber
Min. 4 inch (102 mm)
Min. G = 0.42

Equipment Support Anchoring

7/16 inch (11 mm) Lag Bolt
Min. 3-1/4 inch (83 mm)
Thread Engagement

Timber Anchoring

Centrifugal Utility Fans 7

Maintenance

Bushing

Washers

Cap Screws

Hub

Tapered Bushing Hub Installation
and Removal

For wheel hubs and shaft pulleys utilizing a tapered
bushing interface, follow this procedure for installation
and removal. There are two possible set ups for the
tapered bushing, both have the same procedure, but
orientation of the hub varies.

Tapered Bushing Removal:

1. If present, loosen the setscrew holding the bushing
and shaft key in place.

2. Loosen and remove the socket head cap screws
which fasten the bushing to the hub as shown in
the section views and examples of Figures 3-6.

Standard Mounting Reverse Mounting

Figure 3 Figure 4

Bushing

Hub

Washers

Cap Screws

Hub

Bushing

Washers

Cap Screws

3. Standard Mounting - Take the two socket head
cap screws that were removed and install them
into the visibly threaded holes on the wheel hub.
Reverse Mounting - Install the two socket head
cap screws into the visibly threaded holes of the
bushing flange.

4. Once both socket head cap screws are installed,
tighten them an eighth of a turn at a time,
alternating between the two until the hub comes
loose from the bushing.

Bushing Installation:

1. Clean all surfaces of hub and bushing to remove
any oil or residue present and do not use any
lubricant to install bushing into the hub. For both
standard and reverse mounting styles, the socket
head cap screws are adjustable from the inlet of
the fan.

2. Standard Mounting: Slide the bushing and shaft
key onto the fan shaft followed by the wheel and
hub assembly. If present, use the keyway setscrew
to hold the shaft key and bushing in place but DO
NOT overtighten as this can damage the bushing.
Align the unthreaded holes of the hub with the
threaded holes of the tapered bushing.
Reverse Mounting: Slide the wheel and hub
assembly onto the fans shaft followed by the
bushing and shaft key. If present, use the keyway
setscrew to hold the shaft key and bushing in place
but DO NOT overtighten as this can damage the
bushing. Align the unthreaded holes of the tapered
bushing with the threaded holes of the hub.

3. Install the two bushing socket head cap screws
into the aligned holes by hand (or without
excessive torque) until the heads of the socket
head cap screws are seated against the mating
surface.

4. Adjust the height of the wheel in the fan relative
to the inlet venturi then tighten the two socket
head cap screws an eighth turn at a time in an
alternating fashion and to a torque of 10 ft-lbs.

Figure 5

Standard Bushing Orientation

Centrifugal Utility Fans8

Figure 6

Reverse Bushing Orientation

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.

If unusual conditions exist (temperatures below 32°F
or above 200°F), moisture or contaminants - more
frequent lubrication is required.

Recommended Bearing Lubrication Schedule

Fan

RPM

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 3
1500 12 5 4 3 2
2000 12 3 3 2 1
2500 12 2 2 1 0.5
3000 12 2 1 0.5 0.25
3500 12 1 0.5 0.25 ­4000 12 0.5 0.25 - ­5000 12 0.25 - - -

Number
of Shots

• Lubrication interval is based on 12 hour per day

operation and maximum 160°F 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.

• Lubricant should be a high quality lithium complex
grease conforming to NLGI Grade 2. Factory
recommends Mobilux EP-2.

• The use of synthetic lubricants will increase lubrication
intervals by approximately 3 times.

In addition to lubricating the bearings at specified
intervals, set screws in the bearing collars 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.

Relubrication Schedule in Months

Standard Grease

Bearing Bore (inches)

1/2 -1 11⁄8 - 11⁄2 15⁄8 - 17⁄8 115⁄16 - 23⁄16 27⁄16 - 3

4 8 8 10 16

Motor Maintenance

Motor maintenance is generally limited to cleaning
and lubrication (where applicable). Cleaning should be
limited to exterior surfaces only. Removing dust and
grease buildup on the motor housing assures proper
motor cooling. Use caution and do not allow water
or solvents to enter the motor or bearings. Under no
circumstances should motors or bearings be sprayed
with steam, water or solvents.

Many fractional horsepower motors are permanently
lubricated for life and require no further lubrication.
Motors supplied with grease fittings should be
greased in accordance with the manufacturer’s
recommendations.

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.

Belt Maintenance)

Belts tend to stretch after a period of time. They
should be periodically checked for tension and
wear. When replacing belts, use the same type as
supplied with the unit. Replacement of belts should be
accomplished by loosening the tensioning “L-Bolts”
so the belts may be removed by hand. Do not force
belts on or off as this may cause breakage of cords
and lead to premature belt failure.

Belt tension should be adjusted to allow 1/64 in. of
belt deflection per 1 in. of belt span. For example,
a 16 in. belt span should have 16/64 in. or 1/4 in. of
deflection with moderate thumb pressure at mid-point
between the pulleys. (Figure 7).

Belt Span

Belt Span

Figure 7

Deflection =

64

Centrifugal Utility Fans 9

Motor and Drive Installation Instructions

For model XUEB units that are shipped from stock without motors or drives.

1. Adjust motor pulley to its closed position for
maximum fan speed or increments of 1/2 turn open
(maximum of 5 turns open) for reduced fan speed.
Tighten set screw on flat area only.

4. Install shaft pulley to fan shaft.

2. Install motor pulley to the motor shaft and install
motor to the motor plate. Pre-punched holes are
provided for most common motor frame sizes.

3. If supplied, install taperlock bushing into shaft
pulley.

Centrifugal Utility Fans10

5. Install drive belt(s). Belts should not be forced over
pulleys. Align motor and shaft pulleys. Tighten all
set screws.

6. Adjust belt tension.
See page 9 for belt tensioning instructions.

Parts List

Each fan bears a manufacturer’s nameplate with model number and serial number embossed. This information
will assist the local Accurex representative and the factory in providing service and replacement parts. Before
taking any corrective action, make certain unit is not capable of operation during repairs.

CAUTION

A fan manufactured with an explosion resistant
motor does not certify the entire unit to be explosion
proof. Refer to ULListing Mark for the fans
approved usage.

7

8

9

10

14

CAUTION

La présence d’un moteur antidéflagrant sur un
ventilateur ne garantit pas que tout l’appareil est
antidéflagrant. Pour connaître les emplois autorisés
de l’appareil, voir son marquage de conformité UL.

1

5

6

4

11

13

12

Available Replacement Parts:

1. Scroll housing

2. Drive frame - base angle

3. Intake support panel

4. Inlet ring and cone

5. Wheel (specify rotation)

6. Drive frame assembly

7. Pillow block bearings

2

3

8. Fan shaft

9. Shaft pulley

10. Belt

11. Motor pulley

12. Belt tensioning bolts

13. Motor plate

14. Motor

Centrifugal Utility Fans 11

Troubleshooting

WARNING

Before taking any corrective action, make certain
unit is not capable of operation during repairs.

Avant d’entreprendre toute action corrective,
s’assurer que l’appareil ne pourra pas fonctionner

AVERTISSEMENT

durant les réparations.

PROBLEM CAUSE CORRECTIVE ACTION

Adjust wheel and/or inlet cone. Tighten wheel hub or bearing collars on
shaft.
Tighten sheaves on motor/fan shaft. Adjust belt tension. Align sheaves
properly (see page 5). Replace worn belts or sheaves.
Replace defective bearing(s). Lubricate bearings. Tighten collars and
fasteners.
Clean all dirt off wheel. Check wheel balance, rebalance in place if
necessary.

Excessive
Noise

Low CFM

Wheel Rubbing Inlet

V-Belt Drive

Bearings

Wheel Unbalance

Fan Check wheel for correct rotation. Increase fan speed.*
Duct System See page 5, Effect of Installation on Performance
Fan Resize ductwork. Access door, filters, grills not installed.

High CFM

Duct System

Change obstructions in system. Use correction factor to adjust for
temperature/altitude. Resize ductwork. Clean filters/coils. Change fan

speed.*
Static
Pressure
Wrong

High
Horsepower

Fan Doesn’t
Operate

Duct system has more
or less restriction than

Check rotation of wheel. Adjust fan speed.

anticipated
Fan Check rotation of wheel. Reduce fan speed.

Duct System

Electrical Supply

Resize ductwork. Check proper operation of face and bypass dampers.

Check filters and access doors.

Check fuses. Check for circuit breakers in the off position. 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.
* Always check motor amps and compare to nameplate rating. Excessive fan speed may overload the motor

and result in burnout.

Our Commitment

As a result of our commitment to continuous improvement, Accurex reserves the right to change specifications
without notice.

Specific Accurex product warranties are located on accurex.com within the product area tabs and in the
Library under Warranties.

P.O. Box 410 Schofield, WI 54476

Phone: [phone] • Fax: [phone]

Parts: 800.355.5354 • www.accurex.com

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470312 • XUEB, Rev. 10, July 2016 Copyright 2016 © Accurex, LLC12