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Document 474739
Model XRED Direct Drive
Model XREB Belt Drive
Downblast Centrifugal Roof Exhaust
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.
Direct Drive
Downblast Centrifugal Exhaust
These fans are specifically designed for roof
mounted applications exhausting relatively
clean air. The maximum continuous operating
temperature is 130°F (54ºC). Direct Drive models
are made with nominal wheel diameter ranging
from 8 to 30 inches (203 to 762 mm) (060300 unit sizes). Each fan shall bear a permanently
affixed manufacturer’s embossed metal nameplate
containing the model number and individual serial
number. All fans are UL/cUL Listed Standard 705.
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 high winds
or 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. Adjustments 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.
Belt Drive
Downblast Centrifugal Exhaust
These fans are specifically designed for
roof mounted applications exhausting
relatively clean air. The maximum continuous
operating temperature is 180°F (82ºC). Belt
Drive models are made with nominal wheel
diameters ranging from 11 to 54 inches
(279 to 1372 mm) (071-540 unit sizes). Each fan shall
bear a permanently affixed manufacturer’s embossed
nameplate containing the model number and individual
serial number. All fans are UL/cUL Listed Standard 705.
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.
Downblast Centrifugal Roof Exhaust 1
Page 2
Table of Contents
Receiving, Unpacking, Handling ..............2-3
Storage ...................................3
Inspection and Maintenance During Storage ......3
Removing from Storage ......................3
Dimensional Data ...........................4
Installation Typical Roof Mounting
and Wiring Diagram ..........................5
Pre-Starting Checks .......................6-7
Operation ..................................7
Inspection .................................7
Maintenance ...............................8
Tapered Bushing Hub Installation and Removal .8
Bushing Installation .......................9
Belt and Bearing Maintenance ...............9
Bearing Lubrication Schedule ...............9
Fan Inlet Connections .......................10
Parts List .................................10
Troubleshooting ............................11
Mounting for Severe Duty .............Backcover
Our Commitment ....................Backcover
Handling
Belt and Direct Drive Units
Lift Direct Drive unit on to the roof utilizing hooks under
the lip of the shroud. Evenly space the hooks around
the shroud using a minimum of four lifting straps. Use
a spreader bar to ensure the straps do not come in
contact with the unit (see Figure 1).
Figure 1
Spreader
Bar
Lifting
Strap
Hook
Hook
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 notification 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 representative. Any
physical damage to the unit after acceptance is not the
responsibility of the 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.
Figure 2
Figure 3
Screws
Hook With
Safety Latch
(Supplied by others)
(2) Bearing Plate
Lifting Points
(4) Drive Frame
Lifting Points
Screws
1¾ in.
(44 mm)
Curb Cap
Downblast Centrifugal Roof Exhaust2
Page 3
When lifting a belt drive unit on to the roof, use either
the four lifting points on the drive frame or the two lifting
points on the bearing plate if present (see Figure 2
for lifting points). Access to the drive frame is
accomplished by removing the screws indentified
in Figure 3. The cover can then be removed and placed
on a flat surface in an area protected from strong winds.
When direct and/or belt drive unit is on the roof, move
fan to desired location using lifting points and fasten
securely through mounting holes in base. Shims may be
necessary depending upon roofing material thickness.
The motor amperage and voltage ratings must be
checked for compatibility to supply voltage prior to
final electrical connection. For direct and/or belt drive
installations, the electrical supply should be routed
through the conduit chase located between the curb
cap and the bottom of the motor compartment. Wiring
must conform to local and national codes.
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 - 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 get rid of any moisture
buildup. 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
that 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 that 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. 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
hard to reach internal surfaces or for occasional use,
consider using Tectyl® 511M Rust Preventive, WD-40®
or the equivalent.
®
506 (Ashland Inc.) or the equivalent. For
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.
Downblast Centrifugal Roof Exhaust 3
Page 4
Dimensional Data
Direct Drive
Figure 4 - Typical Roof Mounting Installation
Disconnect
Screws
¾ in.
(19 mm)
Wiring by Others
Damper
1¼ in.
(32 mm)
Recommended Duct
and Damper Size
Recommended Roof
Opening
Model Size Curb Cap Damper
060, 070 17 (432) 8 (203) 10½ (267) 18 (8)
080, 090, 095 17 (432) 10 (254) 12½ (318) 26 (12)
097, 098, 099 19 (483) 12 (305) 14½ (368) 57 (26)
103, 103HP 19 (483) 12 (305) 14½ (368) 62 (28)
123 19 (483) 12 (305) 14½ (368) 65 (30)
133 19 (483) 12 (305) 14½ (368) 66 (30)
143, 143HP 22 (559) 16 (406) 18½ (470) 76 (35)
163 22 (559) 16 (406) 18½ (470) 80 (36)
183 30 (762) 18 (457) 20½ (521) 119 (54)
203, 200HP 30 (762) 18 (457) 20½ (521) 130 (59)
240 34 (864) 24 (610) 26½ (673) 158 (72)
300 40 (1016) 30 (762) 32½ (826) 320 (145)
• All dimensions are in inches (millimeters).
* Approximate weight shown in pounds (kilograms) is the largest
cataloged open drip proof motor.
• “Curb Cap” is the inside dimension of the curb cap.
• The roof curb should be 1½ in. (38 mm) less than the curb cap to allow
for roofing and flashing.
• Roof opening is a square dimension
Minimum of 8 in.
(203 mm)
1¼ in.
(32 mm)
Roof
Opening
*Approx.
Weight
Belt Drive
Figure 5 - Typical Roof Mounting Installation
Disconnect
¾ in.
(19 mm)
Wiring by Others
Damper
1¼ in.
(32 mm)
Recommended Duct
and Damper Size
Recommended Roof
Opening
Model Size Curb Cap Damper
071, 081, 091 19 (483) 12 (305) 14½ (368) 58 (26)
101, 101HP 19 (483) 12 (305) 14½ (368) 63 (29)
121 19 (483) 12 (305) 14½ (368) 66 (30)
131 19 (483) 12 (305) 14½ (368) 67 (30)
141, 141HP 22 (559) 16 (406) 18½ (470) 83 (38)
161, 161HP 22 (559) 16 (406) 18½ (470) 89 (40)
180, 180HP 30 (762) 18 (457) 20½ (521) 125 (57)
200, 200HP 30 (762) 18 (457) 20½ (521) 138 (63)
220, 220HP,
240, 240HP
34
(864) 24 (610) 26½ (673) 158 (72)
260 40 (1016) 30 (762) 32½ (826) 305 (138)
300, 300HP 40 (1016) 30 (762) 32½ (826) 320 (145)
330 46 (1168) 36 (914) 38½ (978) 385 (175)
360, 360HP 46 (1168) 36 (914) 38½ (978) 403 (183)
420 52 (1321) 42 (1067) 44½ (1130) 495 (225)
480 52 (1321) 48 (1219) 50½ (1283) 623 (283)
500 64 (1626) 54 (1372) 56½ (1435) 687 (312)
540 64 (1626) 54 (1372) 56½ (1435) 748 (339)
• All dimensions are in inches (millimeters).
* Approximate weight shown in pounds (kilograms) is the largest
cataloged open drip proof motor.
• “Curb Cap” is the inside dimension of the curb cap.
• The roof curb should be 1½ in. (38 mm) less than the curb cap to allow
for roofing and flashing.
• Roof opening is a square dimension
Minimum of 8 in.
(203 mm)
1¼ in.
(32 mm)
Roof
Opening
*Approx.
Weight
Downblast Centrifugal Roof Exhaust4
Page 5
Installation
Typical Roof Mounting Installation
1. On the roof surface, cut an appropriate sized hole
and follow manufacturer’s instructions on curb
installation. Caulk and flash the curb to ensure a
water tight seal.
Roof Curb Installation
2. If unit is equipped with a backdraft damper, it
should be installed now.
3. Remove motor cover. Access to the motor
compartment is accomplished by removing the
screws as shown in Figure 3, page 2.
4. On belt drive fans, use the lifting lugs on the drive
frame or bearing plate to lift and place the unit on
top of roof curb. Refer to Figure 2, page 2.
5. On direct drive fans, lift and place the unit on top
of roof curb using hooks under the lip of the shroud.
Refer to Figure 1, page 2.
6. Secure fan to curb using a minimum of eight lag
screws, metal screws or other suitable fasteners.
Shims may be required depending upon curb
installation and roofing material.
7. Verify power line wiring is de-energized before
connecting fan motor to power source.
8. Connect power supply wiring to the motor as
indicated on the motor nameplate or terminal box
cover. Check the power source for compatibility
with the requirements of your equipment.
9. Check fan wheel for free rotation, recenter if
necessary. Check setscrew(s) for tightness.
10. Check all fasteners for tightness.
11. Mount and wire safety disconnect switch under
motor cover. Wire control switches at ground level,
refer to Figure 6.
12. Replace motor cover.
Typical Wiring Diagram
MOTOR
Figure 6
J-BOX
SUPPLY VOLTAGE
115/208-230/60/1
L1
L2
MOTOR
J-BOX
SUPPLY VOLTAGE
208-230/460/60/3
L1
L2
L3
Vari-Green Wiring
For Vari-Green wiring, refer to the Vari-Green Motor
and Controls Installation, Operation and Maintenance
Manual for complete wiring and operation instructions.
IMPORTANT
Installation, troubleshooting and parts replacement are
to be performed only by qualified personnel. Consult
and follow all applicable national, state and local
codes. They will supercede this document.
Downblast Centrifugal Roof Exhaust 5
Page 6
Pre-Starting Checks
1. Check all fasteners and setscrews for tightness.
The wheel should rotate freely and be aligned as
shown in Figure 7.
Overlap
Figure 7
Model Type
Direct Belt
X—060-095 — 3/32
X—097-163 1/4 (6) —
—X071-161 1/4 (6) —
X—183-240 3/8
—X180-240 3/8
X—300 1/2 (13) —
—X260-540 1/2 (13) —
Size
Overlap
in. (mm)
(10) —
(10) —
2. Wheel position is preset and the unit is test run at the
factory. Movement may occur during shipment and
realignment may be necessary.
3. Belt Drive: Centering wheel across the inlet can
be accomplished by loosening the bolts holding
the drive frame to the vibration isolators and
repositioning the drive frame.
Direct and Belt Drive: If further alignment is needed,
loosen shroud bolts and move shroud and motor to
align wheel over inlet properly.
Wheel and inlet cone overlap can be adjusted
by loosening the setscrews in the wheel hub and
moving the wheel to the desired position. For both
direct and belt drive models with 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.
Fan RPM should be checked and verified with a
tachometer.
4. Check wheel rotation (viewing from the shaft side) by
momentarily energizing the unit. Rotation should be
clockwise as shown in Figure8 and correspond to
rotation decal on the unit.
If wheel rotation is incorrect,
reverse two of the wiring
leads or check motor wiring
for single phase. Fan RPM
should be checked and verified
with a tachometer.
Gap
Gap
in. (mm)
(2)
Clockwise Rotation
Figure 8
WARNING
Correct direction of wheel rotation is critical. Reversed
rotation will result in poor air performance, motor
overloading and possible motor burnout.
AVERTISSEMENT
La turbine doit impérativement tourner dans le bon
sens. Une rotation en sens inverse entraînerait de
mauvaises performances de soufflage, une surcharge
du moteur voire un grillage du moteur.
IMPORTANT
The fan has been checked for mechanical noises at
the factory prior to shipment. If mechanical noise
should develop, suggested corrective actions are
offered in the Troubleshooting section.
IMPORTANT
Over tightening belts will cause excessive bearing
wear and noise. Too little tension will cause slippage
at startup and uneven wear.
Belt Drive Pre-Starting Belt Tension Checks
5. Always loosen tension enough to install belts without
stretching. Do not force belt(s) see Figure 9. Forcing
belts will break the cords and cause belt failure.
Figure 9
6. For units with two groove pulleys, adjust so the
tension is equal in both belts.
7. If adjustments are made, it is very important to check
the pulleys for proper alignment. Misaligned pulleys
lead to excessive belt wear, vibration, noise and
power loss, see Figure 10.
CORRECT WRONG WRONG WRONG
Figure 10
Downblast Centrifugal Roof Exhaust6
Page 7
8. Belt tension can be adjusted by loosening four
fasteners on the drive frame, see Figure 11. The
motor plate slides on the slotted adjusting arms and
drive frame angles in
the same manner.
Four (4) fasteners
in total.
Identical fasteners on
opposing side must
also be loosened.
Figure 11
9. Sizes 071-161: Belts should be tensioned just
enough to prevent slippage at full load. Belts should
have a slight bow on the slack side while running at
full load, see Figure 12a.
Belt Span
64
Slack
Side
Deflection =
Belt
Span
Operation
1. Before starting up or operating fan, check all
fasteners for tightness. In particular, check the
setscrews in the wheel hub (or the tapered bushing
and pulleys if applicable).
2. While in the OFF position or before connecting the
fan to power, turn the fan wheel by hand to be sure it
is not striking the venturi or any obstacle.
3. Start the fan and shut it off immediately to check
rotation of the wheel with directional arrow in the
motor compartment, see Figure 8.
4. When the fan is started, observe the operation and
check for any unusual noises.
5. 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.
6. Keep inlets and approaches to fan clean and free
from obstruction.
IMPORTANT
Adjust (tighten) belt tension after the first 24-48 hours
of operation.
Figure 12a
Figure 12b
Sizes 180-540: Belt tension should be adjusted to
allow 1/64 in. (0.397 mm) of deflection per inch of
belt span. For example, a 15 in. (381 mm) belt span
should have 15/64 in. (5.95 mm) (or about 1/4 in.
(6 mm)) of deflection with moderate thumb pressure
at mid-point between pulleys, see Figure 12b.
10. The adjustable motor pulley is factory set for the
RPM specified. Speed can be increased by closing
or decreased by opening the adjustable motor
pulley.
11. Any increase in speed represents a substantial
increase in the horsepower required by the unit.
12. Motor amperage should always be checked to
avoid serious damage to the motor when speed is
varied.
Inspection
Inspection of the fan should be conducted at the
first 30 minute and 24 hour intervals of satisfactory
operation.
30 Minute Interval: Inspect bolts, setscrews and motor
mounting bolts. Adjust and tighten as necessary.
24 Hour Interval: Check all internal components. On
belt drive units only, inspect belt alignment and tension.
Adjust and tighten as necessary.
Downblast Centrifugal Roof Exhaust 7
Page 8
Maintenance
DANGER
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.
DANGER
Pour écarter les risques de blessure grave ou de mort,
débrancher et verrouiller l’alimentation électrique en
position « Arrêt » avant tout contrôle ou entretien.
WARNING
This unit should be made non-functional when
cleaning the wheel or housing (fuses removed,
disconnect locked off).
AVERTISSEMENT
L’appareil doit être rendu non opérationnel lors du
nettoyage de la turbine ou du caisson (fusibles retirés,
sectionneur verrouillé).
IMPORTANT
Uneven cleaning of the wheel will produce an out of
balance condition that will cause vibration in the fan.
Installation and maintenance are to be performed only
by qualified personnel who are familiar with local codes
and regulations and who are experienced with this type
of equipment.
Motor maintenance is generally limited to cleaning
and lubrication (where applicable). Cleaning should be
limited to exterior surfaces only. Removing dust buildup
on motor housing ensures proper motor cooling.
Greasing of motors is only intended when fittings are
provided. Many fractional horsepower motors are
permanently lubricated and should not be lubricated
after installation. Motors supplied with grease fittings
should be greased in accordance with manufacturer’s
recommendations. Where motor temperatures do not
exceed 104ºF (40ºC), the grease should be replaced
after 2,000 hours of running time as a general rule.
Wheels require very little attention when moving clean
air. Occasionally, oil and dust may accumulate causing
imbalance. When this occurs, the wheel and housing
should be cleaned to ensure smooth and safe operation.
All fasteners should be checked for tightness each
time maintenance checks are performed prior to
restarting unit.
A proper maintenance program will help these units
deliver years of dependable service.
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 setups 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 13-16.
Standard Mounting Reverse Mounting
Figure 13
Hub
Bushing
Hub
Washers
Cap Screws
Figure 15
Standard Bushing Orientation
Figure 16
Reverse Bushing Orientation
Bushing
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.
Figure 14
Washers
Cap Screws
Downblast Centrifugal Roof Exhaust8
Page 9
Bushing Installation:
1. Clean all surfaces of hub and bushing to remove any
oil or residue present. 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 on to the fan 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 reach a torque of 10 ft-lbs.
Belt and Bearing Maintenance
1. Belts tend to stretch after a period of time. They
should be checked periodically for wear and
tightness. When replacing belts, use the same type
as supplied with the unit.
2. Matched belts should always be used on units with
multi-groove pulleys.
3. For belt replacement, loosen the tensioning device
enough to allow removal of the belt by hand.
4. Once installed, adjust belts as shown in
“Pre-Starting Checks.”
5. To ensure tightness, check pulley setscrews. Proper
keys must be in keyways.
6. Fan RPM should not be readjusted. Only use pulleys
of identical size and type when replacing pulleys.
7. Shaft bearings can be classified in two
groups: relubricating and non-relubricating. All
non-relubricating bearings on belt drive fans are
factory lubricated and require no further lubrication
under normal use (between -20º to 180ºF
(-29º to 82ºC) in a relatively clean environment).
8. On belt drive fans, the standard cast pillow block
bearings are factory lubricated and are provided
with external grease fittings. Annual lubrication
is recommended, or more frequently if needed.
See Table 2. Do not over-grease. Use only one or
two shots of lubricant with a hand gun. Maximum
hand gun rating is 40 psi. Rotate bearings during
lubrication where good safety practice permits.
Caution should be employed to prevent over
packing or contamination.
9. Units installed in hot, humid or dirty locations should
be equipped with special bearings. These bearings
will require frequent lubrication. Caution should be
employed to prevent over packing or contamination.
10. Grease fittings should be wiped clean. The unit
should be in operation while lubricating bearings.
Extreme care should be used around moving parts.
11. Grease should be pumped in very slowly until a
slight bead forms around the seal. A high grade
lithium base grease should be used. See Table 3.
12. During the first few months of operation, check
bearing setscrews periodically to ensure tightness.
13. If unit is to be left idle for an extended period,
remove belts and store in a cool, dry place to avoid
premature belt failure.
Bearing Lubrication Schedule
NOTE: If unusual environment conditions exist (extreme
temperature, moisture or contaminants) more frequent
lubrication is required.
A good quality lithium base grease, conforming to NLGI
Grade 2 consistency, such as those listed in Table 3
may be used.
Table 2: Suggested Fan Bearing Lubrication Intervals
Interval
(months)
1 to 3
3 to 6
6 to 12 8 to 16 hours per day in clean, relatively dry atmosphere
12 to 18 Infrequent operation or light duty in clean atmosphere
Table 3: Grease Manufacturers
Manufacturer Grease (NLGI #2)
U.S. Electric Motors Grease No. 83343
Chevron U.S.A. Inc Chevron SRI Grease #2
Mobil Oil Corporation
Texaco, Inc.
Amoco Oil Co. Rykon Premium #2
Exxon Unirex N2
Shell B Shell Alvania #2
Heavy duty in dirty, dusty locations; high ambient
temperatures; moisture laden atmosphere; vibration.
12 to 24 hours per day, heavy duty, or if moisture is
present
Type of Service
Mobilith
Mobil 532
Premium BRB #2
Texaco Multifak #2
Downblast Centrifugal Roof Exhaust 9
Page 10
Fan Inlet Connections
In order to ensure proper fan performance, caution must be exercised in fan placement and connection to the
ventilation system. Obstructions, transitions, poorly designed elbows, improperly selected dampers, etc., can cause
reduced performance, excessive noise and increased mechanical stress. For performance to be as published, the
system must provide uniform and stable airflow into the fan.
Good
Poor
Dampers must open fully.
Use motorized dampers in
low airflow applications to
reduce losses.
Avoid sharp turns or
entrance conditions which
cause uneven flow. Use
turning vanes in elbows to
reduce adverse effects.
Poor
Parts List
Each fan bears a manufacturer’s nameplate with model
number and serial number. This information will assist
the local 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.
Good
Provide uniform airflow at
fan inlet and through the
damper to ensure optimum
performance. Curb cap
should be three wheel
diameters from the radius.
Use turning vanes in duct
when possible.
Provide uniform airflow at
fan inlet to ensure optimum
performance.
CAUTION
A fan manufactured with an explosion resistant motor
does not certify the entire unit to be explosion proof.
Refer to ULListing mark for the fans approved usage.
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.
Direct Drive Belt Drive
Motor Cover
Shaft Pulley
Bearings
Drive Frame
Assembly
Vibration
Isolators
Shroud
Wheel
Conduit
Chase
Vertical
Support
Vibration
Isolators
Shroud
Birdguard
Wheel
Curb Cap/
Venturi
Downblast Centrifugal Roof Exhaust10
Motor
Hood Clip
Shroud Brace
Vertical
Support
Lower
Windband
Motor Cover
Belt
Motor Pulley
Motor
Fan Shaft
Birdguard
Shroud Brace
Windband
Curb Cap/
Venturi
Page 11
Troubleshooting
WARNING
Before taking any corrective action, make certain unit
is not capable of operation during repairs.
PROBLEM CAUSE CORRECTIVE ACTION
Adjust wheel and/or inlet cone.
Tighten wheel hub or bearing collars on shaft.
Tighten pulleys on motor/fan shaft. Adjust belt tension. Align pulleys
properly, see page 6, Figures 9 and 10. Replace worn belts or pulleys.
Replace defective bearing(s). Lubricate bearings.
Tighten collars and fasteners.
Clean all dirt off wheel.
Check wheel balance, rebalance in place if necessary.
Center wheel on inlet, see page 6, Figure 7.
Remove objects, check for damage or unbalance.
Replace motor with same frame size, RPM-HP.
Resize ductwork. Check proper operation of face and bypass dampers.
Check filters and access doors.
Check fuses/circuit breakers. Check for switches off.
Check for correct supply voltage.
Replace damaged bearing. Relieve excessive belt tension.
Align bearings. Check for bent shaft.
Check motor wiring, see page 5, Figure 4. Confirm wheel rotation, see
page 6, Figure 8.
Check drives or slow down fan by opening variable pitch pulley on
motor shaft.
Check system: Proper operation of backdraft or control dampers,
obstruction in ductwork, clean dirty filters.
Excessive
noise
or vibration
High
horsepower
Fan does
not operate
Motor
overloads
or overheats
Reduced
airflow
Wheel rubbing inlet
V-belt drive
Bearings
Wheel unbalance
Belts too tight or too loose Adjust tension, see page 7, Figure 12a-b.
Wheel improperly aligned and
rubbing
Loose drive or motor pulleys Align and tighten. See “Pre-Starting Checks”, see page 6 and 7.
Foreign objects in wheel or
housing
Fan base not securely anchored Secure properly.
Motor hood loose and rattling Tighten fasteners to secure the motor hood.
Defective or loose motor
bearings
Fan Check rotation of wheel, see page 6, Figure 8. Reduce fan speed.
Duct system
Electrical supply
Drive Check for broken belts. Tighten loose pulleys or belts.
Motor Ensure motor is correct horsepower and not tripping overload protector.
Lubrication Check for excessive or insufficient grease in the bearing.
Mechanical
Belt slippage Adjust tension or replace bad belts, see pages 6 and 7.
Over/Under line voltage Contact power company.
Incorrect wheel rotation
Wheel RPM too high
Undersized motor Check motor ratings with catalog speed and air capacity chart.
Motor wired incorrectly Check motor wiring to wiring diagram located on fan motor.
System resistance too high
Unit running backwards Correct as shown on page 6, Figure 8.
Excessive dirt buildup on wheels Clean wheel.
Improper wheel alignment Center wheel on inlet, see “Pre-Starting Checks” on page 6.
Dampers closed Inspect and repair.
Blocked duct/clogged filter Clean or replace.
Belt slippage Replace and adjust tension.
Speed too slow Check for correct drives.
Avant d’entreprendre toute action corrective, s’assurer
que l’appareil ne pourra pas fonctionner durant les
réparations.
AVERTISSEMENT
Downblast Centrifugal Roof Exhaust 11
Page 12
Mounting for Severe Duty Installations
Fan to Curb Mounting: 5/16-inch self-drilling fasteners
are to be installed on each side of fan with one fastener
4 inches from each edge and one fastener in the center.
Fasteners are to be equally spaced.
1¼ in.
(32 mm)
Fasteners
Per Side
Fan Size
≤ 163 3
180 to 240 5
≥ 260 9
1¼ in.
(32 mm)
Curb Corner
Anchor Detail
Roof Curb
Model GPF, GPFHL, GPFHD or Equivalent
18 ga. min.
High wind ratings – 42 in. Tall Max
Seismic ratings – 24 in. Tall Max
Steel Welded Construction
High Wind Ratings
Fasteners Fasteners
Fan Size Curb Cap Size
≤ 141
Concrete
> 141
≤ 141
Steel
> 141
≤ 141
Timber
> 141
All dimensions are in inches (millimeters).
17x17 to 22x22
(432x432 to 559x559 mm)
26x26 to 40x40
(660x660 to 1016x1016 mm)
17x17 to 22x22
(432x432 to 559x559 mm)
26x26 to 40x40
(660x660 to 1016x1016 mm)
17x17 to 22x22
(432x432 to 559x559 mm)
26x26 to 40x40
(660x660 to 1016x1016 mm)
Self-Drilling
Screw Size
3/8”
1/4” - 14
3/8”
Per
Total Fan Size
Side
3 12 060-300 2 8
3 12 330-540 3 12
3 12 060-300 2 8
4 16 330-540 3 12
3 12 060-300 2 8
4 16 330-540 3 12
Curb to Deck Mounting: Fasteners need to be located
on all four sides of the curb.
Roof Curb Roof Curb
3/8 in. (10 mm) S.S. Hilti Kwik Bolt
Three Expansion Anchors
Min. 2-1/2 in. (64 mm) Engagement
2500 Min. PSI
Concrete
Concrete
Deck Anchoring
Roof Curb
Wood Timber
Min. 4 in. (102 mm)
Nominal Thickness
Min. G = 0.42
G: Specific Gravity
of Lumber
Deck Anchoring
Timber Anchoring
1/4 in. - 14 Self-Drilling Screw
Min. 1/2 in. (13 mm) of Threads Through
Roof Truss
1/8 in. (3 mm) Thick
or 12 ga. Min.
Steel
3/8 in. (10 mm) Lag Bolt (Zinc Plated)
Min. 3 in. (76 mm) Thread Engagement
Seismic
Ratings
Per
Side
Total
NOTE: Installation instructions for seismic
ratings are only recommendations.
Final design must be determined by
Structural Engineer of Record (SEOR) including
requirements for curb construction, mounting
of unit to curb and mounting of curb to
structure.
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: 800.333.1400 • Fax: 715.241.6191
Parts: 800.355.5354 • accurex.com
12
474739 • XRED and XREB, Rev. 8, March 2019 © 2019 Accurex, LLC12
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