Larkin XRAE User manual

Document 474589
Model XRAE/XRAS
Axial Exhaust and Supply Fans
Axial Exhaust and Supply Fans 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.
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.
Recommended Duct
and Damper Size
Recommended Roof Opening
1.25 in.
Wiring by Others
0.75 in.
8 in. or 12 in.
Optional Disconnect

Larkin Industries, Inc.
114 David Green Rd., Birmingham, AL 35244
Phone: [phone] Fax: [phone]
Email: [email protected]
474589 • XRAE and XRAS, Rev. 3, March 2018 Copyright 2018 © Larkin Industries, Inc.2
Troubleshooting
Problem Cause Corrective Action
Ventilator
Inoperative
Blown fuse or breaker Replace or repair motor
Defective motor Replace or repair
Incorrectly wired Shut power OFF and check wiring
for proper connections
Insufficient
Airflow
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
Check for secure connection
where duct permitting air loss
sections are joined (suggest duct
tape at seams for sealed closure)
Excessive
Noise or
Vibration
Loose propeller Tighten set screws
Accumulation of material on propeller Clean
Ventilator base not securely anchored Secure properly
Motor hood loose and rattling Tighten acorn nuts securing
motor hood
Fan propeller out of balance Replace propeller
Motor
Overloads or
Overheats
Propeller RPM too high Check drives
Shorted motor winding Replace motor
Incorrect propeller rotation Check motor wiring
Over/Under line voltage Contact power Company
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.
Parts List
Shroud
Propeller
Motor Cover
Isolator Kit
Motor
Conduit
Curb Cap/Venturi
Windband
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.