Larkin XRUB-101 Installation Manual

Document 474738

Model XRUD Direct Drive

Model XRUB Belt Drive

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

Model XRUD Direct Drive

Model XRUD is a direct drive upblast
centrifugal exhaust fan. These fans are
specifically designed for roof mounted
applications. Performance capabilities range
up to 6,400 cfm (10,874 m3/hr) and up to
3 in. wg (747 Pa) of static pressure. The
maximum continuous operating temperature
for fan sizes 098-200 is 400°F (204°C) and
for fan sizes 060-095 is 160°F (71°C). XRUD fans are
available in twenty sizes with nominal wheel diameter
ranging from 9 to 20 inches (229to 508 mm) (060-200
unit sizes). Each fan shall bear a permanently affixed
manufacturer’s engraved metal nameplate containing
the model number and individual serial number.

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 are 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 Electrical 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.

Model XRUB Belt Drive

Model XRUB is a belt drive upblast
centrifugal exhaust fan. These fans are
specifically designed for roof mounted
applications. Performance capabilities
range up to 30,000 cfm (50,970 m3hr)
and up to 5.0 in. wg (1240 Pa) of static
pressure. The maximum continuous

operating temperature is 400°F (204°C).
XRUB fans are available in twenty-seven sizes with
nominal wheel diameter ranging from 10 to 48 inches
(254 to 1219 mm) (099-480 unit sizes). Each fan shall
bear a permanently affixed manufacturer’s engraved
metal nameplate containing the model number and
individual serial number.

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.

Upblast Centrifugal Roof Exhaust 1

Receiving

(4) Drive Frame
Lifting Points

(2) Bearing Plate
Lifting Points

Hook With
Safety Latch
(Supplied by others)

Upon receiving the product, check the bill of lading
to ensure all items were received. Inspect each crate
for shipping damage before accepting delivery. All
damage should be noted on all the copies of the bill of
lading and a claim should be filed with the carrier. Any
physical damage to the unit after acceptance is not
the responsibility of 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

Handling

XRUD Direct Drive

Lift unit on to the roof utilizing hooks under the
horizontal supports. Evenly space the hooks 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.

Spreader Bar

Lifting
Strap

Hook

Figure 1

IMPORTANT

Do not lift by the fan hood. Avoid lifting fans in a
way that will bend or distort fan parts. Never pass
slings or timbers through the venturi of fan. Fans
with special coatings or paints must be protected in
handling to prevent damage.

Screw

Figure 3

Screw

XRUB Belt Drive

When lifting the unit onto 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 pointed out in
Figure 3. The cover can then be removed and placed
on a flat surface in an area protected from strong
winds.

When XRUD/XRUB 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 XRUD/XRUB
installations, the electrical supply should be routed
through the conduit chase located between the curb
cap and the bottom of the motor compartment or
through the breather tube. Wiring must conform to
local and national codes.

Upblast Centrifugal Roof Exhaust2

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 in. (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 on 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 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
equivalent. For 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

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.

IMPORTANT

Installation, troubleshooting and parts replacement
is to be performed only by qualified personnel.
Consult and follow all applicable national, state and
local codes. They will supercede this document.

Upblast Centrifugal Roof Exhaust 3

Dimensional Data

Installation

XRUD - Direct Drive

Roof

101⁄2

(267)

121⁄2

(318)

141⁄2

(368)

181⁄2

(470)

201⁄2

(521)

*Approx.

Weight

29

(13)

40

(18)

67

(30)

90

(41)

142

(64)

Model Curb Cap Damper

XRUD 060, 065, 070, 075

XRUD 080, 085, 090, 095

XRUD 099, 101, 121, 131

XRUD 141, 161

XRUD 180, 200

• All dimensions are in inches (millimeters). *Approximate weight shown in

lbs. (kg.) is the largest cataloged Open Drip Proof motor.

• The roof curb should be 1½ in. (38 mm) less than the curb cap to allow for
roofing and flashing.

17

(432)8 (203)

19

(483)

19

(483)

22

(559)

30

(762)

(254)

(305)

(406)

(457)

Opening

10

12

16

18

XRUB - Belt Drive

Model

XRUB 099, 101, 101HP,
121, 131

XRUB 141, 141HP,
161, 161HP

XRUB 161XP

XRUB 180

XRUB 180HP

XRUB 200

XRUB 200HP

XRUB 220, 220HP,
240, 240 HP, 240 XP

XRUB 360, 360HP,
360XP

XRUB 420

XRUB 480

• All dimensions are in inches (millimeters). *Approximate weight shown in

lbs. (kg.) is the largest cataloged Open Drip Proof motor.

• The roof curb should be 1½ in. (38 mm) less than the curb cap to allow for
roofing and flashing.

Curb

Cap

(483)

(559)

(559)1 (25)

(762)

(762)1 (25)

(762)

(762)1 (25)

(864)1 (25)

(1168)

(1321)

(1473)

19

22

22

30

30

30

30

34

46

52

58

Shaft

Bearings

3

⁄4

(19)

3

⁄4

(19)

3

⁄4

(19)

3

⁄4

(19)

11⁄4

(32)

11⁄4

(32)

11⁄2

(38)

Damper

12

(305)

16

(406)

16

(406)

18

(457)

18

(457)

18

(457)

18

(457)

24

(610)

36

(914)

42

(1067)

48

(1219)

Roof

Opening

141⁄2

(368)

181⁄2

(470)

181⁄2

(470)

201⁄2

(521)

201⁄2

(521)

201⁄2

(521)

201⁄2

(521)

261⁄2

(673)

381⁄2

(978)

441⁄2

(1130)

501⁄2

(1283)

*Approx.

Weight

66

(30)

87

(39)

87

(39)

126

(57)

126

(57)

142

(64)

142

(64)

175

(79)

440

(200)

578

(262)

675

(306)

General Ventilation Installation

Screw

Conduit
Chase

3/4 in.

(19 mm)

8 or 12 in. min.

(203 or 305 mm)

Roof Deck

(32 mm)

1

1

/4 in.

Wiring by

Others

Damper

Recommended

Duct and

Damper Size

Recommended

Roof Opening

Figure 5 - 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.

4. On XRUB 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 XRUD direct drive fans, lift and place the
unit on top of roof curb using hooks under the
horizontal supports. 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. For commercial kitchen and UL Listed
emergency smoke control applications,
the electrical supply must enter the motor
compartment through the breather tube. For
other non-flammable applications, the electrical

Screw

Factory Wired
Motor to
Disconnect

11/4 in.

(32 mm)

Upblast Centrifugal Roof Exhaust4