Accurex XRAS Owner’s Manual

Document 475564

Model XRAE and XRAS

Axial Exhaust and Supply 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 these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.

General Safety Information

When Installing or Servicing the Fan

Do not depend on any switch as the sole means of
disconnecting power when installing or servicing the
fan. Always disconnect, lock and tag power source
before installing or servicing. Failure to disconnect
power source can result in fire, shock, or serious
injury. Motor will restart without warning after thermal
protector trips. Do not touch operating motor, it may be
hot enough to cause injury.

Do not place any body parts or objects in fan, motor
openings, or drives while motor is connected to power
source.

Do not use this equipment in explosive atmospheres!

1. Read and follow all instructions and cautionary
markings. Make sure electrical power source conforms
to requirements of equipment and local codes.

2. Ventilators should be assembled, installed and serviced
by a qualified technician. Have all electrical work
performed by a qualified electrician.

3. Follow all local electrical and safety codes in the United
States and Canada, as well as the National Electrical
Code (NEC), the Occupational Safety and Health Act
(OSHA), and the National Fire Protection Association
(NFPA) Bulletin 96 in the United States. Ground motor
in accordance with NEC Article 250 (grounding). Follow
the Canadian Electrical Code (CEC) in Canada.

4. Motor and fan must be securely grounded (bare metal)
to a suitable electric ground, such as a grounded water
pipe or ground wire system.

In United States, to reduce the risk of injury to persons,
OSHA complying guards are required when fan is
installed within 7 feet of floor or working level.

In Canada, to reduce the risk of injury to persons, CSA
complying guards are required when fan is installed
below 2.5 meters (8.2 feet) above floor or grade level.

1. Do not kink power cable or allow it to come in contact
with sharp objects, oil, grease, hot surfaces or
chemicals. Replace damaged cords immediately.

2. Make certain that the power source conforms to the
requirements for the equipment.

3. Never open access door to a duct with the ventilator
running.

4. Motor must be securely and adequately grounded.
This can be accomplished by wiring with a grounded,
metal-clad race way system by using a separate
ground wire connected to the bare metal of the motor
frame or other suitable means.

Pre-Starting Checks

1. Inspect for any damage that may have occurred during
transit.

2. Shipping damage claim must be filed with carrier.

3. Check all bolts, screws, setscrews, etc. for looseness that
may have occurred during transit. Retighten as required.
Rotate propeller by hand to be sure it turns freely.

Installation

Installation, troubleshooting and parts replacement is to
be performed only by a qualified personnel. Consult and
follow applicable building codes which will supercede this
document.

NOTE: Refer to motor nameplate for wiring procedures.
Refer to switch manufacturer for installation and wiring
procedures.

1. Cut an appropriate sized hole in the roof surface. Follow
curb manufacturer’s installation instructions. Caulk and
flash curb to ensure a watertight seal.

2. Install optional backdraft damper. Secure damper flange
to curb damper tray with fasteners provided.

3. Remove motor cover.

4. Place ventilator on curb.

5. Secure ventilator to roof curb using a minimum of eight
fasteners.

6. Check ventilator propeller for free rotation.

7. Check all fasteners for tightness.

8. Mount and wire safety disconnect switch under ventilator
cover and wire motor per wiring diagram on motor.

9. Replace motor cover.

10. Wire control switches at ground level.

Optional Disconnect

8 in. or 12 in.

1.25 in.

Recommended Duct

and Damper Size

Recommended Roof Opening

0.75 in.

Wiring by Others

Axial Exhaust and Supply Fans 1

Operation

1. Before starting up or operating, check all fasteners
for tightness. In particular, check set screws in
propeller hub. While in the OFF position, or before
connecting the ventilator to power, turn the fan
propeller by hand to be sure it is not striking the
venturi or any obstacle.

2. Start the ventilator up and shut it off immediately
to check rotation of the propeller with directional
arrow in the motor compartment. Ventilator propeller
should rotate counterclockwise on all models when
viewed from the top and clockwise for size 10 only.

3. When the ventilator is started, observe the operation
and check for any unusual noises.

4. With the system in full operation and all ductwork
attached, measure current input to the motor and
compare with the nameplate rating to determine if
the motor is operating under safe load conditions.

5. Keep inlets and approaches to ventilator
clean and free from obstruction.

Troubleshooting

Problem Cause Corrective Action

Maintenance

Disconnect and lockout power source
before servicing.

Uneven cleaning of the propeller will
produce an out-of-balance condition that
will cause vibration in the ventilator.

1. Keep inlets and approaches to ventilator
clean and free from obstruction.
Depending on the usage and severity
of the contaminated air, a regularly
scheduled inspection for cleaning the
fan propeller, ventilator, and surrounding
areas should be established.

2. Check for unusual noises when fan is
running.

3. Periodically inspect and tighten
setscrews.

4. Follow motor manufacturer’s instructions
for motor lubrication.

Ventilator
Inoperative

Insufficient
Airflow

Excessive
Noise or
Vibration

Motor
Overloads or
Overheats

Parts List

Motor

Shroud

Windband

Propeller

Blown fuse or breaker Replace or repair motor

Defective motor Replace or repair

Incorrectly wired

Blocked duct or clogged filters Clean or replace

Speed too slow Check for correct drives

Damper closed Inspect/repair damper

Incorrect propeller rotation Check motor wiring

Loose fitting duct sections

Loose propeller Tighten set screws
Accumulation of material on propeller Clean

Ventilator base not securely anchored Secure properly

Motor hood loose and rattling

Fan propeller out of balance Replace propeller

Propeller RPM too high Check drives

Shorted motor winding Replace motor

Incorrect propeller rotation Check motor wiring

Over/Under line voltage Contact power company

Isolator Kit

Motor Cover

Curb Cap/Venturi

Shut power OFF and check wiring
for proper connections

Check for secure connection
where duct permitting air loss
sections are joined (suggest duct
tape at seams for sealed closure)

Tighten acorn nuts securing
motor hood

Conduit

Our Commitment

Our Commitment

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

Product warranties can be found online at accurex.com, either on the specific product page or in the Warranty
section of the website at Accurex.com/Resources/Warranty.

P.O. Box 410 Schofield, WI 54476
Phone: [phone] • Fax: [phone]
Parts: 800.355.5354 • accurex.com

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475564 • XRAE and XRAS, Rev. 3, March 2018 © 2019 Accurex, LLC2