Larkin XREB-091 Installation Manual

Page 1

Document #474740

Model XRED and XREB

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 XRED Direct Drive

Model XRED is a direct drive downblast centrifugal exhaust fan. These fans are speciﬁcally designed for roof mounted applications exhausting relatively clean air. Performance capabilities range up to 4,300 cfm (7,305 m and up to 1 in. wg (249 Pa) of static pressure. The maximum continuous operating temperature is 180°F (82ºC). XRED models are available in 27 sizes with nominal wheel diameter ranging from 8 to 24 inches (203 to 610 mm) (060 - 243 unit sizes). Each fan shall bear a permanently afﬁxed manufacturer’s engraved metal nameplate containing the model number and individual serial number. All fans are UL/ cUL Listed Standard 705.

/hr)

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.

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.

Model XREB Belt Drive

XREB model fans are belt drive downblast centrifugal exhaust fans. These fans are speciﬁcally designed for roof mounted applications exhausting relatively clean air. Performance capabilities range up to 44,700 cfm (75,950 m and up to 2.5 in. wg (623 Pa) of static pressure. The maximum continuous operating temperature is 180°F (82ºC). XREB models are available in twenty sizes 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 nameplate containing the model number and individual serial number. All fans are UL/cUL Listed Standard 705.

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.

7. Never open access doors to a duct while the fan is running.

/hr)

Downblast Centrifugal Roof Exhaust Fans

Page 2

Receiving

Upon receiving the product, check to make sure all items are accounted for by referencing the bill of lading to ensure all items were received. Inspect each crate for shipping damage before accepting delivery. Notify the carrier if any damage is noticed. The carrier will make notiﬁcation on the delivery receipt acknowledging any damage to the product. All damage should be noted on all the copies of the bill of lading which is countersigned by the delivering carrier. A Carrier Inspection Report should be ﬁlled out by the carrier upon arrival and reported to the Trafﬁc Department. If damaged upon arrival, ﬁle a claim with carrier. Any physical damage to the unit after acceptance is not the responsibility of Larkin Industries, Inc.

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.

Handling

XRED Direct Drive

Lift 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

Figure 2

Hook With Safety Latch (Supplied by others)

(2) Bearing Plate Lifting Points

(4) Drive Frame Lifting Points

Figure 3

Screws

Curb Cap

Screws

1¾ in. (44 mm)

XREB Belt Drive

When lifting the 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 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 XRED/XREB 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 XRED/XREB 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.

Downblast Centrifugal Roof Exhaust Fans

Page 3

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.

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 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 or the equivalent.

506 (Ashland Inc.) or the equivalent. For

511M Rust Preventive, WD-40®

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.

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.

Downblast Centrifugal Roof Exhaust Fans

Page 4

WARNING

Installation, troubleshooting and parts replacement is to be performed only by qualified personnel.

WARNING

Disconnect power before installing or servicing.

CAUTION

A fan manufactured with an explosion resistant motor does not certify the entire unit to be explosion proof.

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.

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. Only on XREB Belt Drive fans. On the drive frame use the lifting lugs to lift and place the unit on top of roof curb. (Refer to Figure 2 on page 2).

5. Secure fan to curb using a minimum of eight lag screws, metal screws or the suitable fasteners. Shims may be required depending upon curb installation and rooﬁng material.

Note: Severe duty applications may require

additional fasteners.

6. Verify power line wiring is de-energized before connecting fan motor to power source.

7. 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.

8. Check fan wheel for free rotation, recenter if necessary.

9. Check all fasteners for tightness.

10. Mount and wire safety disconnect switch under motor cover. Wire control switches at ground level, refer to Figure 4.

11. Replace motor cover.

Downblast Centrifugal Roof Exhaust Fans

Typical Wiring Diagram

MOTOR

SUPPLY VOLTAGE 115/208-230/60/1

J-BOX

Figure 4

L1 L2

Vari-Green Wiring

Contact Larkin Industries for Vari-Green motor wiring

MOTOR

J-BOX

SUPPLY VOLTAGE

208-230/460/60/3

Page 5

XRED - Direct Drive

Model

Curb

Cap

Damper

XRED 060, 065, 070, 075 17 (432) 8 (203) 10½ (267) 18 (8)

XRED 080, 085, 090, 095 17 (432) 10 (254) 12½ (267) 26 (12)

XRED 97, 98, 99 19 (483) 12 (305) 14½ (368) 57 (26)

XRED 103, 103 HP 19 (483) 12 (305) 14½ (368)

XRED 123 19 (483) 12 (305) 14½ (368) 65 (30)

XRED 133 19 (483) 12 (305) 14½ (368) 66 (30)

XRED 143, 143 HP 22 (559) 16 (406) 18½ (470) 76 (35)

XRED 163, 163 HP 22 (559) 16 (406) 18½ (470) 80 (36)

XRED 183, 183 HP 30 (762) 18 (457) 20½ (521)

XRED 203, 203 HP

XRED 223/243, 223/243 HP

30 (762) 18 (457) 20½ (521) 130 (59)

34 (864) 24 (610) 26½ (673) 150 (68)

Roof

Opening

*Approx.

Weight

62 (28)

119 (54)

XREB - Belt Drive

Model

Curb

Cap

Damper

XREB 071, 081, 091 19 (483) 12 (305) 14½ (368) 58 (26)

XREB 101, 101HP 19 (483) 12 (305) 14½ (368) 63 (29)

XREB 121 19 (483) 12 (305) 14½ (368) 66 (30)

XREB 131 19 (483) 12 (305) 14½ (368) 67 (30)

XREB 141, 141HP 22 (559) 16 (406) 18½ (470) 83 (38)

XREB 161, 161HP 22 (559) 16 (406) 18½ (470) 89 (40)

XREB 180, 180HP 30 (762) 18 (457) 20½ (521) 125 (57)

XREB 200, 200HP 30 (762) 18 (457) 20½ (521) 138 (63)

XREB 220, 220HP, 240, 240HP

(864) 24 (610) 26½ (673) 158 (72)

XREB 260 40 (1016) 30 (762) 32½ (826) 305 (138)

XREB 300, 300HP 40 (1016) 30 (762) 32½ (826) 320 (145)

XREB 330 46 (1168) 36 (914) 38½ (978) 385 (175)

XREB 360, 360HP 46 (1168) 36 (914) 38½ (978) 403 (183)

XREB 420 52 (1321) 42 (1067) 44½ (1130) 495 (225)

XREB 480 52 (1321) 48 (1219) 50½ (1283) 623 (283)

XREB 500 64 (1626) 54 (1372) 56½ (1435) 687 (312)

XREB 540 64 (1626) 54 (1372) 56½ (1435) 748 (339)

Roof

Opening

*Approx.

Weight

XRED Direct Drive

Figure 5 - Typical Roof Mounting Installation

Screws

¾ in.

Wiring by Others

Dimensions shown in

(19)

1¼ in.

(32)

inches (mm)

Damper

Recommended Duct

and Damper Size

Recommended Roof

Opening

XREB Belt Drive

Figure 6 - Typical Roof Mounting Installation

¾ in.

Wiring by Others

Dimensions shown in

(19)

1¼ in.

(32)

inches (mm)

Damper

Recommended Duct

and Damper Size

Recommended Roof

Opening

Disconnect

8 or 12 in.

(203 or 305)

1¼ in.

(32)

Disconnect

8 or 12 in.

(203 or 305)

1¼ in.

(32)

• All dimensions are in inches (millimeters).

* Approximate weight shown in pounds (kilograms) 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.

Downblast Centrifugal Roof Exhaust Fans

Page 6

Pre-Starting Checks

1. Check all fasteners and set screws for tightness. The wheel should rotate freely and be aligned as shown in Figure 7 below.

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. Only XRED unit - Centering height alignment can be accomplished by loosening the set screws in the wheel and moving the wheel to the desired position.

4. Only XREB unit - Centering can be accomplished by loosening the bolts holding the drive frame to the shock mounts and repositioning the drive frame.

5. Only XREB unit - Wheel and inlet cone overlap can be adjusted by loosening the set screws in the wheel and moving the wheel to the desired position.

6. Only XREB unit - Fan RPM should be checked and veriﬁed with a tachometer.

7. Check wheel rotation (viewing from the shaft side) by momentarily energizing the unit. Rotation should be clockwise as shown in Figure 8 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.

Wheel Overlap and Gap Dimensions

Model

XRED 060-095 – 3/32 (2)

XRED 97-163 1/4 (6) –

XREB 071-161 1/4 (6) –

XRED 183-243 3/8 (10) –

XREB 180-240 3/8 (10) –

XREB 260-540 1/2 (13) –

G - Overlap

in. (mm)

H - Gap in. (mm)

Wheel Rotation

Clockwise Rotation All Models

Figure 8

WARNING

Correct direction of wheel rotation is critical. Reversed rotation will result in poor air performance, motor overloading and possible burnout.

WARNING

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 will cause excessive bearing wear and noise. Too little tension will cause slippage at startup and uneven wear.

Model XREB

Pre-Starting Belt Tension Checks

8. Always loosen tension enough to install belts without stretching, see Figure 9.

Belts

Do not force belt(s). Forcing the belt(s)

Figure 9

will break the cords and cause belt failure.

Figure 7

Downblast Centrifugal Roof Exhaust Fans

9. For units with two groove pulleys, adjust so the tension is equal in both belts.

10. 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.

Figure 10

Page 7

Fasteners

(4) four fasteners*

*Identical fasteners on opposing side must also be loosened.

Figure 11

11. 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.

12a. Sizes 071-161: Belts should be tensioned just

enough to prevent slippage at full load.

Note: Belts should have a slight bow on the slack

side while running at full load (see Figure 12a).

Deﬂection

Slack Side

Figure 12a Figure 12b

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. (0.234 mm) (or about 1/4 in. (6 mm)) of deﬂection with moderate thumb pressure at mid-point between pulleys (see Figure 12b).

13. 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.

14. Any increase in speed represents a substantial increase in the horsepower required by the unit.

15. Motor amperage should always be checked to avoid serious damage to the motor when speed is varied.

Operation: XRED / XREB

1. Before starting up or operating fan, check all fasteners for tightness. In particular, check the setscrews in wheel hub.

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.

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.

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 XREB unit only, inspect belt alignment and tension. Adjust and tighten as necessary.

Maintenance: XRED / XREB

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.

WARNING

Always disconnect, lock and tag power source before servicing. Failure to disconnect power source can result in fire, shock or serious injury.

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 manufacturers’ 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.

CAUTION

Uneven cleaning of the wheel will produce an out of balance condition that will cause vibration in the fan.

WARNING

This unit should be made non-functional when cleaning the wheel or housing (fuses removed, disconnect locked off).

Downblast Centrifugal Roof Exhaust Fans

Page 8

Belt/Bearing Maintenance XREB Unit

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. Shaft bearings can be classiﬁed in two groups: relubricating and non-relubricating. All non-relubricating bearings on model XREB fans are factory lubricated and require no further lubrication under normal use (between -20º to 180ºF (-29º to 82ºC) in a relatively clean environment).

6. On XREB belt driven 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.

7. Grease ﬁttings should be wiped clean. The unit should be in operation while lubricating. Extreme care should be used around moving parts.

8. 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)

9. To ensure tightness, check pulley setscrews. Proper keys must be in keyways.

10. Fan RPM should not be readjusted. Only use pulleys of identical size and type when replacing pulleys.

11. During the ﬁrst few months of operation, check bearing setscrews periodically to ensure tightness.

12. 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.

Recommended Relubrication Frequency in Months

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 here may be used.

Table 2: Suggested Fan Bearing Greasing Intervals

Interval

(months)

1 to 3

3 to 6

6 to 12

12 to 18 Infrequent operation or light duty in clean atmosphere

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

8 to 16 hours per day in clean, relatively dry atmosphere

Table 3: Grease Manufacturers

Type of Service

Mobilith

Mobil 532

Premium BRB #2

Texaco Multifak #2

Fan Inlet Connections

In order to assure 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.

Downblast Centrifugal Roof Exhaust Fans

Avoid sharp turns or entrance conditions which cause uneven flow. Use turning vanes in elbows to reduce adverse effects.

Poor

Good

Provide uniform airflow at fan inlet to assure optimum performance.

Provide uniform airflow at fan inlet and through the damper to assure optimum performance. The curb cap should be three wheel diameters from the radius. Use turning vanes in duct when possible.

Page 9

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, Figure 9-10. 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.

Assure motor is correct horsepower and not tripping overload protector.

Replace damaged bearing. Relieve excessive belt tension. Align bearings. Check for bent shaft.

Check motor wiring (page 4) verify motor is wired for correct rotation.

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.

Center wheel on inlets, see Pre-Starting checks on page 6, Figure 7.

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.

Foreign objects in wheel or housing

Fan base not securely anchored Secure properly.

Motor hood loose and rattling Tighten screws securing 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.

Motor

Lubrication Check for excessive or insufﬁcient grease in the bearing.

Mechanical

Belt slippage Adjust tension or replace bad belts, see page 6-7.

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

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.

Downblast Centrifugal Roof Exhaust Fans

Page 10

Maintenance Documentation

Job Information

Job Name: ____________________________________ Service Organization: __________________________________

Address: ______________________________________ Address: _____________________________________________

City: _________________________________________ City: _________________________________________________

State: _______________ Zip: ___________________ State: _________________ Zip:_________________________

Phone: _______________________________________ Phone: _______________________________________________

Contact Person: _______________________________ Work Done By: ________________________________________

Nameplate Information Field Start-Up Documentation

Model: _______________________________________

Volts: _________ Hertz: ________ Phase: _______ Actual Voltage: _________ Hertz: ________ Phase: ________

Amps: _______________ Mark: _________________ Actual Amperage: _____________________________________

Supply hp: ___________ Exhaust hp: ____________ Blower Rotation: ______________________________________

Serial Number: ________________________________ Air Volume: _______________ Design cfm: _______________

Model Voltage: ________________________________ Actual cfm: ___________________________________________

Motor Amperage: ______________________________ Level of fan (L or H): ___________________________________

Fan RPM: _____________________________________ Fan RPM Range (min.) ____________ (max.) ______________

Maintenance Log

Date ___________________Time _____________ AM/PM

Notes: ___________________________________________

_________________________________________________

Date ___________________Time _____________ AM/PM

Notes: ___________________________________________

_________________________________________________

Date ___________________Time _____________ AM/PM

Notes: ___________________________________________

_________________________________________________

Date ___________________Time _____________ AM/PM

Notes: ___________________________________________

_________________________________________________

Date ___________________Time _____________ AM/PM

Notes: ___________________________________________

_________________________________________________

Date ___________________Time _____________ AM/PM

Notes: ___________________________________________

_________________________________________________

Date ___________________Time _____________ AM/PM

Notes: ___________________________________________

_________________________________________________

Downblast Centrifugal Roof Exhaust Fans

Date ___________________Time _____________ AM/PM

Notes: ___________________________________________

_________________________________________________

Page 11

Parts List

NOTE: Each fan bears a manufacturer’s nameplate with model number and serial number embossed. 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.

XRED Direct Drive Centrifugal Roof Exhaust Fan

Motor Cover

Motor

Shock

Mounts

Shroud

Birdguard

Wheel

Curb Cap/

Venturi

Hood Clip

Shroud Brace

Vertical Support

Lower Windband

XREB Belt Drive Centrifugal Roof Exhaust Fan

Motor Cover

Shaft Pulley

Bearings

Drive Frame

Assembly

Shock Mounts

Shroud

Wheel

Conduit

Chase

Vertical

Support

Belt

Motor Pulley

Motor

Fan Shaft

Birdguard

Shroud Brace

Windband

Curb Cap/ Venturi

Downblast Centrifugal Roof Exhaust Fans

Page 12

Roof Curb Installation

Larkin Industries, Inc. 114 David Green Rd., Birmingham, AL 35244 Phone: 1.800.322.4036 Fax: 1.205.987.0583 Email: Sales@larkinhoods.com