Accurex XREB Installation Manual
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
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
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
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
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