Twin city Hib Instruction manual

Contents

Introduction .........................................................................1

Shipping and Receiving .....................................................1

Handling .............................................................................. 1

Short Term Storage ...........................................................2

Long Term Storage............................................................2

Foundations and Supporting Structures ..........................2

Fan Installation ................................................................... 2

Factory Assembled Units .............................................2

Disassembled Units .......................................................3

Fan Operation – Safety .....................................................4

Operation Checklist ............................................................5

Maintenance of Fans .........................................................5

General Motor Maintenance .........................................5

Drive Maintenance .........................................................5

Bearing Maintenance .....................................................5

Lubrication ......................................................................6

Wheel and Shaft Maintenance .....................................7

Structural Maintenance .................................................7

Troubleshooting Guidelines................................................7

Troubleshooting Performance Problems

Air Capacity Problems .................................................. 7

Noise Problems ............................................................. 7

Vibration Problems ........................................................ 7

Motor Problems ............................................................. 7

Drive Problems .............................................................. 7

Bearing Problems ..........................................................8

Limitation of Warranties and Claims ............................... 8

Introduction

The purpose of this manual is to provide instructions

that complement good general practices when install-

ing or operating fans manufactured by Twin City Fan &

Blower. It is the responsibility of the purchaser to pro-

vide qualified personnel experienced in the installation,

operation, and maintenance of air moving equipment.

Instructions given in the body of this manual are

general in nature and apply to a variety of models

manufactured by Twin City Fan & Blower. Most units

can be installed and maintained with the instructions

given. Additional product and engineering information is

available at www.tcf.com.

Special applications may require additional information.

These instructions are supplied in the form of attached

appendices. Use the instructions in the appendix if the direc-

tions in this manual differ from instructions in the appendix.

As always, follow good safety practices when install-

ing, maintaining and operating your air moving equip-

ment. A variety of safety devices are available. It is

the user’s responsibility to determine adequate safety

measures and to obtain the required safety equipment.

Shipping and Receiving

All Twin City Fan & Blower products are carefully con-

structed and inspected before shipment to insure the

highest standards of quality and performance.

Compare all components with the bill of lading or

packing list to verify that the proper unit was received.

Check each unit for any damage that may have

occurred in transit. Any damage should be reported

immediately to the carrier and the necessary damage

report filed.

Handling

Handling of all air moving equipment should be con-

ducted by trained personnel and be consistent with safe

handling practices. Verify the lift capacity and operat-

ing condition of handling equipment. Maintain handling

equipment to avoid serious personal injury.

Units shipped completely assembled may be lifted with

slings and spreader bars. Use well-padded chains, cables

or nylon straps. On most units, lifting lugs are provided

for attaching chains (see Figure 1). Lift the fan in a fash-

ion that protects the fan and fan coating from damage.

Never lift a fan by the inlet or discharge flange, shafting

or drives, wheel or impeller, motor or motor base, or in

any other manner that may bend or distort parts.

Partial or disassembled units require special handling.

All parts should be handled in a fashion which pro-

tects the coatings and parts from damage. Components

should be handled such that forces are not concentrated

and bending or distortion cannot occur.

Figure 1. Lifting Lug Locations

ES-52

August 2014

Centrifugal Fans

INSTALLATION, OPERATION & MAINTENANCE MANUAL

Lifting Lugs

2Twin City Engineering Supplement ES-52

Housing should be lifted using straps and spreaders. Do

not distort housing or side plates when lifting.

Bearing pedestals should be lifted using straps or pad-

ded chains. Under no circumstances should an attached or

separated bearing pedestal be lifted by the shaft, bearings,

drives, motor or wheel.

The shaft and wheel assembly may be lifted using

a hoist and a spreader

with a sling around the

shaft at points nearest the

wheel (see Figure 2). Take

care not to scratch the

shaft where the wheel or

bearings will be mounted.

Never lift or support the

assembly by the wheel.

Always support the assem-

bly by the shaft when lifting

or storing. Do not support

the shaft or the wheel on

housing sides. Use only the

key provided with the shaft

and wheel.

Wheels shipped separately can be lifted by slings run-

ning through the blades and around the hub. Never lift the

wheel by blades or flanges. Always transport wheels by

lifting. Do not roll the wheel as this can damage coatings

and change the balance of the wheel.

Bent shafting is a source of vibration and bearing failure,

so handle the shaft with care. Any scratches on the shaft

may be removed with fine emery cloth or a stone.

Short Term Storage

If fan installation is to be delayed, store the unit in a

protected area. Protect the fan and motor bearings from

moisture and vibration (or shock loading).

Long Term Storage

Prior to Storage – Fan bearings (and motor bearings per

the motor manufacturer’s specifications) are to be greased

at the time of going into extended storage. On belt drive

units the belt tension should be reduced to less than half

the specified value for the fan’s design to prevent a sag/

set from forming in the shafts and belts.

If the unit was supplied with a motor, the motor windings

should be measured at this time and recorded for

comparison prior to placing in service. If the fan housing

was supplied with a drain connection, this plug should

be removed to prevent any moisture from accumulating in

this portion of the unit during storage.

Storage Procedure – Fans should be stored indoors when-

ever possible where control over temperature, shock and

dust is reasonably maintained. If units are to be stored

outside in the elements, they should be covered with a

water-resistant material. The bearings should be shielded

individually from water and dirt; however, do not tightly

seal to avoid trapping condensation. Stored equipment

should be stored on a clean, dry floor or blocked up off

the ground on blocks to prevent unit from setting in any

water or directly on the ground. If shock or vibration will

be present during storage, the unit may need to be placed

on some type of vibration dampening material to aid in

preventing brinelling of the bearing surfaces.

Periodic Check – On a monthly interval, the equipment

should be checked to ensure that it has remained in an

acceptable stored condition. The fan (and motor if sup-

plied) should be rotated several times by hand while add-

ing enough grease to replenish the bearing surfaces with

fresh grease and to maintain a full bearing cavity. Grease

used must be compatible with that already supplied in the

motor and fan bearings. The fan impeller should be left

at approximately 180 degrees from that of the previous

month to prevent the shaft and impeller from taking a

set in one position. Storage records should be maintained

which indicate the above requirements have been followed.

Consult the motor manufacturer for proper storage, space

heater connection and lubrication if the unit was supplied

with one.

Start-Up – When the unit is removed from storage, all fan

bearing grease should be purged and replenished with fresh

grease as per the lubrication decal. The motor should be

measured to verify that the resistance is still at a satisfac-

tory level compared to the value recorded prior to storage.

Spherical roller bearings with split pillow block housings

should be recharged with grease. The bottom half of the

housing should be 1/3 full.

Foundations and Supporting Structures

Floor mounted fans should be installed on a flat, level, rigid

concrete foundation with a mass at least three to five times

that of the assembly supported as a guide, depending on

the size and speed of the fan. Foundation shall be suitable

for static and dynamic loads and foundation frequencies

be separated at least 20% from the rotational speed/speed

ranges. The plan area should be no more than twice that

required by the equipment. Foundations with larger areas

should have correspondingly larger mass. Anchor bolts

should be “L” or “T” shaped with sufficient length for nuts,

washers, shims, and threads for draw-down. Each bolt

should be placed in a sleeve or pipe with a diameter larger

than the bolt to allow for adjustment.

If the fans are mounted on a sub-structure, an inertia

base with spring isolator system should be considered.

Fans mounted to or within a structure should be placed

as close as possible to a rigid member such as a wall or

column. The structure must be designed for rotating equip-

ment; static design for strength is not sufficient to insure

proper operation. Supports for suspended fans must be

cross-braced to prevent side sway. Structural resonance

should be at least 20% from fan operating speed. Vibration

isolators should be used where applicable.

Any ducting should have independent support; do not

use the fan to support ducting. Isolating the fan from

ductwork with flex connections eliminates transmission of

vibration. Fans handling hot gases require expansion joints

at both the inlet and discharge to prevent excessive loads

caused by thermal growth.

For fans requiring concrete filled bases or pedestals,

please refer to Twin City Fan's installation and mainte-

nance manual "Heavy Duty Centrifugal Fans - ES-995"

for instructions.

Fan Installation – Factory Assembled Units

Follow proper handling instructions given earlier.

1. Move the fan to the final mounting position.

2. Remove skid, crates, and packing materials carefully.

3. If supplied, place vibration pads or isolation base on

mounting bolts. Line up holes in fan base with bolts.

4. Place fan on mounting structure. Carefully level unit

using shims as required at all mounting hole locations.

Bolt down the unit. Be careful not to force the fan to

conform to the mounting structure/foundation. This may

cause the bearings to become misaligned or pinched

causing vibration and premature failure.

5. Any grout may now be used. Bolt the fan in position

before applying grout. Do not depend upon grout to

support rotating equipment.

6. Continue with Operations Checklist.

Figure 2. Moving Shaft and

Wheel with Spreader Bar

Twin City Engineering Supplement ES-52 3

Additional instructions may be given for some fan models,

components and accessories in the appendix.

Fan Installation – Disassembled Units

A unit is considered “disassembled” if any component

required for proper operation is shipped or supplied sepa-

rately or in pieces. Reference earlier instructions concerning

proper handling of fan components.

Instructions for Mounting and Assembly of Unit:

1. Move lower housing/framework to mounting location.

2. If vibration pads or bases are used, place on bolts first.

Place lower housing assembly onto bolts.

3. Level and shim if required. Bolt into place.

4. If separated pedestal or bearing pedestal:

a. Bring bearing pedestal to desired location.

b. Place any vibration base or pads into place. Set

bearing pedestal on bolts.

c. Never distort bearing pedestal by forcing it to align

with a non-level surface. Shim beneath the pedestal

as required.

d. Check bearing centerline height. Change centerline

height to match centerline height of housing. High

temperature units may require the housing centerline

to be lower when cold so that it will be centered

when hot.

e. Measure from housing to bearing pedestal to bring

bearing pedestal into square with housing (a large

square may also suffice).

f. Bolt into position.

5. Shaft and wheel assembly preparation:

a. Clean protective coating off shaft with solvent. Do

not touch clean areas of shaft with hands. Perspiration

can cause rust or pitting over time.

b. Remove keys from shaft.

c. Clean inside of wheel bore with solvent. Make sure

setscrews will not interfere when inserting shaft into

wheel bore.

6. Arrangement 1, 9 or 10: Drive Component Assembly

(See Figure 3):

a. Insert shaft into wheel from back side of wheel.

b. When shaft is flush with wheel hub, put key into

keyway and tighten wheel setscrews.

c. Insert shaft through opening in drive side. (If split

housed unit, lower into position.)

d. Install bearings onto shaft. Do not tighten bearing

setscrews at this time. The bearing housing should

be perpendicular and the bearing base parallel to the

axis of the shaft to prevent loads caused by misalign-

ment.

e. Mount assembly, bolt bearings to drive stand. Shaft

Figure 3. Drive Component Assembly

must be parallel with side of bearing pedestal.

Precision shim bearings as required. After aligning

and bolting bearings to pedestal, lock bearings. Be

sure expansion bearing (if supplied) is set to allow

for growth. Continue with step 8.

7. Arrangement 3 (Split-housed) units (See Figure 4):

a. Parts on DWDI units are assembled in the following

order as viewed from opposite drive side: Bearing

bar assembly and opposite bearing, funnel, (hous-

ing side), wheel, (housing side), funnel, drive side

bearing bar assembly, drive bearing and sheaves.

Mount bearing bar assembly to housing. Center

wheel in funnels.

b. Parts on SWSI units are assembled in the following

order as viewed from opposite drive side: Bearing

bar assembly and opposite bearing, funnel, (housing

side), wheel, (housing side), drive side bearing bar

assembly, drive bearing and sheaves. Mount bearing

bar assembly to housing. (See Figure 7 for wheel-

funnel overlap.)

c. Assemble parts in above order on shaft.

d. Move assembly into position. Lightly bolt bearings

into place.

e. Shaft should be parallel with discharge of housing.

Move bearings to accommodate.

f. Level shaft; shim bearings if required. Lock bearings.

Be sure expansion bearing (if supplied) is set to allow

for shaft growth.

8. Install motor on base. Carefully align shafts for drive

installation.

9. Mount drives as follows:

a. Slip (do not pound)

proper sheave

onto correspond-

ing shaft. CAUTION:

PLACING FAN

SHEAVE ON MOTOR

CAN OVERSPEED

WHEEL AND CAUSE

STRUCTURAL

FAILURE.

b. Position sheaves

so they are placed

on motor shaft and

fan shaft as close

as possible to the

motor and/or bear-

ing. Sheave must be

placed so that it does not rub on the bearing,

motor guard or other structures. On keyed shafts,

Shaft

Centerline

Bearing

Pedestal

Sheave

Bearing

Inlet Funnel

Housing Side

Wheel

Assembled Bearing,

Shaft, Funnel, and

Housing. Frame

Angles Not Shown.

Figure 4. Split-housed Drive Component Assembly

SHEAVE LINED

UP WITH END

OF KEYWAY

RUN OUT

RUN OUT OF

KEYWAY

KEYWAY LENGTH

Figure 5. Sheave Position

4Twin City Engineering Supplement ES-52

RBO, RBR Wheel Placement

Size

913 915 917 919 921 923 926 929 933 937 941 945 949 954 960

0.53 0.53 0.59 0.69 0.78 0.88 0.97 1.03 1.22 1.38 1.56 1.69 1.81 1.88 2.16

the key should be placed in

the keyway pushed toward the

bearing as far as the runout

will allow without rubbing. The

back of the sheave should be

lined up with the end of the

key (see Figure 5 on page 3).

For sheaves without a key, the

sheave should be placed as

close to motor and/or bearing

as possible without rubbing.

Typically the sheave should

be at least ¼" away from the

motor, bearing, guard, struc-

tures, etc.

c. Align sheaves with a straight-

edge extended along the perim-

eters of both sheaves, just

making contact in two places

on outside perimeters of both

sheaves (see Figure 6).

d. Tighten down sheave bolts.

e. Install a matched set of belts. Slide the motor to

obtain slack and tighten belts. Using a pry will

damage belts.

f. Tighten belts to proper belt tension. Ideal tension

is just enough tension so that belts do not slip

under peak load. Recheck sheave alignment.

g. After initial installation of belts, recheck belt tension

again after a few days to adjust belt tension. (New

belts require a break-in period of operation.)

10. Install any safety devices or accessories supplied.

(Accessories commonly used are inlet vanes, shaft

seals and shaft coolers, plugs, dampers, and inlet or

discharge screens. Refer to appropriate documents

in appendix.)

11. Grout may now be applied. Grout is used to dis-

tribute loads and should not be used as the sole

support of any rotating equipment.

12. When connecting the fan to the system, it is recom-

mended that the inlet and discharge be isolated from

the system with flex connections (where practical) to

block transmitted vibration. All duct connections to

the fan should be independently supported. Do not

use fan to support duct.

Fan Operation - Safety

For general safety practices for air moving equipment,

see AMCA Bulletin 410.

Twin City Fan & Blower has many safety accesso-

ries available. These safety devices include (but are not

limited to) belt guards, shaft guards, inlet and discharge

screens. The use, abuse, or non-use of safety devices

is the responsibility of the purchaser.

Facility-related safety conditions include fan acces-

sibility and location. How easily can non-service person-

nel access the unit? Is the fan in a hazardous duty

environment? Was the unit ordered for this duty? Other

concerns must also be addressed. All fans should be

powered through switches which are easily accessible

to service personnel from the fan. Every switch should

have the ability to be “locked-off” by the service person

and the key to be retained by this person to prevent

accidental power of the fan while service is in process.

DIA

RBO RBR

SWSI DWDI

Figure 7. Wheel-Funnel Overlap

HIB, RTF, HRT* Wheel Placement

Size

A B B* Size A B B*

19 23 19 23

180

20.50 0.31 — — 400 45.25 0.69 1.03 0.97

200

22.50 0.34 — — 450 50.00 0.75 1.13 1.06

220

25.00 0.38 — — 490 55.13 0.81 1.25 1.13

240

27.50 0.44 — — 540 61.00 0.91 1.38 1.25

270

30.38 0.47 0.50 0.50 600 67.50 1.00 1.31 1.31

300

33.50 0.50 0.69 0.69 660 74.25 1.13 1.56 1.44

330

37.00 0.56 0.69 0.69 730 82.00 1.22 1.75 1.63

360

41.00 0.63 0.81 0.81 800 90.75 1.34 1.06 1.31

HIB, RTF, HRT, BC, BCS, TSL, BAF, BAE, EPF & EPQ

BC-SW, BC-DW, BCS, TSL, BAF SWSI & DWDI Wheel Placement

Size

122 135 150 165 182 200 222 245 270 300 330

12.25 13.50 15.00 16.50 18.25 20.00 22.25 24.50 27.00 30.00 33.00

0.32 0.34 0.38 0.44 0.56 0.63 0.69 0.75 0.88 0.97 1.06

RBA, RBO & RBR

Size

365 402 445 490 542 600 660 730 807 890

36.50 40.25 44.50 49.00 54.25 60.00 66.00 73.00 80.75 89.00

0.94 1.03 1.13 1.25 1.38 1.56 1.69 1.88 2.09 2.28

EPF, EPQ, BAE SWSI & DWDI Wheel Placement

Size

182 200 222 245 270 300 330 365 402 445 490

19.00 20.82 23.16 25.51 28.11 31.23 34.36 38.00 41.90 46.33 51.01

0.38 0.41 0.46 0.50 0.55 0.62 0.68 0.75 0.83 0.91 1.01

Size

542 600 660 730 807

56.48 62.47 68.71 76.00 84.07

1.11 1.23 1.36 1.50 1.66

EPF, EPQ Wheel Placement

Size

122 150 165

13.00 14.13 16.16

0.25 0.25 0.25

BAE SWSI & DWDI Wheel Placement

Size

122 135 150 165

12.25 13.50 15.00 16.50

0.31 0.34 0.38 0.44

RBA

RBA Wheel Placement

Size

907 909 911 913 915 917 919 921 923 926 929 933 937 941 945 949 954 960

0.25 0.38 0.47 0.53 0.59 0.69 0.69 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

MBW, MBO & MBR

MBW, MBO, MBR Wheel Placement

Size

196 224 252 280 308 336 365 421 477 533 589

MBW

0.50 0.44 0.38 0.25 0.38 0.44 0.56 0.63 0.75 0.75 0.88

MBO

0.50 0.44 0.38 0.25 0.38 0.44 0.56 0.63 0.75 0.75 0.88

MBR

0.25 0.25 0.25 0.25 0.25 0.38 0.50 0.69 0.81 0.94 1.00

GAP

FC Wheel Placement

Size

A B Size A B

10.5

0.47 0.69 30 0.75 4.38

0.25 1.88 33 0.81 5.00

0.44 2.19 36 0.75 5.00

0.50 2.25 39 1.06 6.38

0.69 2.88 42 1.69 7.50

0.81 3.00 48 1.50 7.13

0.69 3.13 54 1.00 10.50

Dia.

BCN Wheel Placement

Size

270 300 330 365 402 445 490 542 600 660 730

0.09 0.09 0.13 0.13 0.13 0.16 0.16 0.19 0.22 0.22 0.25

BCN

APF & APQ Wheel Placement

Size

121 141 161 181 201 221 251 281 321 351 391 441 491 551 631 711 791

13.00 14.13 16.16 18.44 19.94 22.78 25.06 28.25 31.81 35.81 39.81 44.56 50.06 55.75 63.69 71.69 79.63

0.25 0.25 0.25 0.31 0.31 0.31 0.50 0.50 0.56 0.63 0.63 0.75 0.78 0.81 1.03 1.28 1.38

Note: On sizes 905-911 wheel is to be centered in housing.

*Use second 'B' columns for HRT-19 and HRT-23 dimensions

Note: On sizes 421-589 wheel is to be centered in housing.

Figure 6.

Sheave Alignment

Twin City Engineering Supplement ES-52 5

Operation Check List

Verify that proper safety precautions have been followed:

□ Electrical power must be locked off.

Check fan mechanism components:

□ System connections are properly made and tightened.

□ Bearings are properly lubricated.

□ Wheel, drives and fan surfaces are clean and free of

debris.

□ Rotate the impeller by hand to verify it has not shifted

in transit.

□ Check fan/wheel overlap. (See Figure 7.)

□ Drives on correct shafts (not reversed).

□ Check position of guards to prevent rubbing.

Check fan electrical components:

□ Motor is wired for proper supply voltage.

□ Motor was properly sized for power and rotational

inertia of rotating assembly.

□ Motor is properly grounded.

□ All leads are properly insulated.

Trial “bump”:

□ Turn on power just long enough to start assembly

rotating.

□ Check rotation for agreement with rotation arrow.

Does the assembly make any unusual noise?

(See Figure 8.)

□ Check drive alignment and tension. Does this meet

with drive manufacturer’s recommendations?

□ Correct any problems which may have been found.

(Follow safety guidelines - shut power off.) Perform

checklist again until unit is operating properly.

□ Run unit up to speed.

Verify fastener tightness. These may have loosened dur-

ing shipment or installation.

□ Setscrews attaching wheel hub to shaft.

□ Setscrews in drive sheaves or coupling.

□ Nuts on inlet funnel.

□ Nuts and bolts holding motor.

□ Nuts holding housing frame to base and base to

ground.

□ Nuts on accessories including shaft seal, access

doors and pie-splits.

□ Bolts in taper-lock bushings.

□ Grease line connections.

□ After one week of operation, check all nuts, bolts and

setscrews and tighten if necessary.

Maintenance of Fans

This section contains general maintenance instructions

for your Twin City Fan & Blower unit. For specific infor-

mation about maintenance of components, particularly

for special application fans, see the attached documents.

General Motor Maintenance

The three basic rules of motor maintenance are keep the

motor clean, dry and properly lubricated.

Keeping motors and windings clean is important

because dirt and dust serve as thermal insulators. Heat

normally dissipated by the motor is trapped causing

overheating and/or premature failure. Blow dust and dirt

out of windings and off the motor periodically. Use low

pressure (50 psig) airstream so that winding damage does

not occur. Keep the area surrounding the motor open

so the air can circulate through the motor cooling fan.

Follow normal maintenance schedule given to the right.

Motors should be kept dry to avoid electrical short

circuits. Motors kept in storage for long periods of time

can have moisture condense on the windings. Be certain

the motor is dry before using.

Some smaller motors are lubricated for life. Motor

bearing lubrication, if required, must follow a rigorous

schedule. Motors less than 10 hp running about eight

hours a day in a clean environment should be lubri-

cated once every five years; motors 15 to 50 hp, every

3 years; and motors 50 to 150 hp, yearly. For motors

in a dusty or dirty environment or running 24 hours a

day, divide the service interval by 2. If the environment

is very dirty or high temperatures exist, divide the ser-

vice interval by 4. Lubrication requirements are normally

attached to the motor. Do not overlubricate.

Motors controlled by variable frequency drives (VFDs)

should be wired in accordance with VFD manufacturer's

instructions. The motor must be grounded to earth and

proper shielded cabling must be used. Grounding rings

should be considered.

Drive Maintenance

V-belt drives need periodic inspection and occasional

belt replacement. When inspecting drives, look for dirt

buildup, burrs or obstructions which can cause prema-

ture belt or drive replacement. If burrs are found, use

fine emery cloth or a stone to remove the burr. Be

careful that dust does not enter the bearings.

Check the sheaves for wear. Excessive slippage of

belts on sheaves can cause wear and vibration. Replace

worn sheaves with new ones. Carefully align sheaves to

avoid premature sheave failure.

Observe belts for wear. If fraying or other wear is

observed to be mostly on one side of the belts, the

drives may be misaligned. Reinstall the drives according

to instructions given for Fan Installation – Disassembled

Units. Never use belt dressing on any belts.

When replacing belts, replace the entire set. After

initial replacement and tensioning, recheck belt tension

after a few days to adjust belt tension again. (New belts

require a break-in period of operation.)

Bearing Maintenance

For instructions covering special lubrication intervals,

bearing assembly or disassembly, or installation details,

see attached documents. Any bearing which is disas-

sembled should be kept separate from other bearing

parts as components may not be interchangeable.

Maintain cleanliness of components and bearings to

prevent bearing contamination.

BAF, BAE, EPF, EPQ,

APF & APQ Wheels

HIB, BCS

& BCN

Wheels

BC, RBA &

TBA Wheels

HRT & RTF

Wheels

FC & NFC

Wheels

RBO, RBW, RBR

MBO, MBR &

TBR Wheels

Figure 8. Proper Wheel Rotation

6Twin City Engineering Supplement ES-52

Bearing failure can occur from many causes. See

Troubleshooting section for details.

Note: All speeds shown do not apply to all shaft sizes

in that group. Consult the factory if in doubt of maxi-

mum speed for a particular bearing.

Lubrication

Proper lubrication of bearings helps assure maximum

bearing life. All fans are equipped with decals indicating

relubrication intervals for normal operating conditions.

However, every installation is different and the frequency

of lubrication should be established accordingly.

Experience has shown that airborne moisture and

heavy dust will dramatically reduce the life of the bearing

lubricant. If any of these adverse conditions exist, it is

recommended that bearings be regreased after several

days of operation. Lubrication intervals can then be

adjusted based on the condition of the purged grease.

Figure 9 illustrates the decal for ball bearings, Figure

10 the decal for solid pillow block spherical roller bear-

ings, and Figure 11 shows the decal for spherical roller

Figure 11. Safety & Lubrication Instructions for Fans

with Spherical Roller Bearings with Split Pillow

Block Housings

WARNING

1. This equipment must not be operated without proper guarding of

all moving parts. While performing maintenance be sure remote

power switches are locked off. See installation manual for recom-

mended safety practices.

2. Before starting: Check all setscrews for tightness, and rotate wheel

by hand to make sure it has not moved in transit.

*Suggested lubrication interval under ideal continuous operating condi-

tions. Remove bearing cap and observe condition of used grease after

lubricating. Adjust lubrication frequency as needed. Use one-half of

listed interval for vertical shaft applications or for 24 hour operation.

Hours of operation, temperature, and surrounding conditions will affect

the relubrication frequency required. Clean and repack bearings annu-

ally. Remove old grease, pack bearing full and fill housing reservoir

o n b o t h s i d e s o f b e a r i n g s t o b o t t o m o f s h a f t .

1. Lubricate with a high quality NLGI No. 2 lithium-base grease hav-

ing rust inhibitors and antioxidant additives, and a minimum oil

viscosity of 500 SUS at 100°F (38°C). Some greases having these

properties are:

Shell - Gadus S2 V100 2 Exxon - Ronex MP

Mobil - Mobilith SHC100 Mobil - Mobilith SHC220

2. Lubricate bearings prior to extended shutdown or storage and

rotate shaft monthly to aid corrosion protection.

3. Purge or remove old grease when changing lubrication brands or

types.

Static Oil Lubrication

1. Use only high quality mineral oil with a VG grade indicated on the

customer submittal drawing.

2. Static oil level should be at the center of the lower-most roller

(Do not overfill.)

3. Complete lubrication change should be made annually.

Relubrication Schedule (Months)*

Spherical Roller Bearing - Split Pillow Blocks

Speed (RPM)

Shaft DIA

500 750 1000 1500 2000 2500 3000 3500 4000

17⁄16" thru 115⁄16" 6 41⁄2 4 4 31⁄2 2

1⁄2 2

1⁄2 1 1

0.50 oz.

(35 – 50)

23⁄16" thru 213⁄16" 5 41⁄2 4 2

1⁄2 2

1⁄2 1

1⁄2 1⁄2 1⁄4 1⁄4

0.75 oz.

(55 – 70)

215⁄16" thru 315⁄16" 41⁄2 4 31⁄2 2

1⁄2 1

1⁄2 1 1⁄2

2.00 oz.

(75 – 100)

47⁄16" thru 415⁄16" 4 4 21⁄2 1 1⁄2

4.00 oz.

(110 – 135)

57⁄16" thru 615⁄16" 4 21⁄2 1

1⁄2

7.00 oz.

(140 – 180)

Grease

to be

added

at each

interval

WARNING

1. This equipment must not be operated without proper guarding of

all moving parts. While performing maintenance be sure remote

power switches are locked off. See installation manual for recom-

mended safety practices.

2. Before starting: Check all setscrews for tightness and rotate wheel

by hand to make sure it has not moved in transit.

*Suggested lubrication interval under ideal continuous operating condi-

tions. Relubricate while running, if safety permits, until some purging

occurs at seals. Adjust lubrication frequency depending on conditions

of purged grease. Use one-half of listed interval for vertical shaft appli-

cations or for 24 hour operation. Hours of operation, temperature, and

surrounding conditions will affect the relubrication frequency required.

1. Lubricate with a high quality NLGI No. 2 lithium-base grease hav-

ing rust inhibitors and antioxidant additives, and a minimum oil

viscosity of 500 SUS at 100°F (38°C). Some greases having these

properties are:

Shell - Gadus S2 V100 2 Exxon - Ronex MP

Mobil - Mobilith SHC100 Mobil - Mobilith SHC220

2. Lubricate bearings prior to extended shutdown or storage and

rotate shaft monthly to aid corrosion protection.

Relubrication Schedule (Months)*

Spherical Roller Bearing - Solid Pillow Blocks

Speed (RPM)

Shaft DIA

500 1000 1500 2000 2500 3000 3500 4000 4500

1" thru 17⁄16" 6 4 4 2 1 1 1 1 1⁄2

(25 – 35)

11⁄16" thru 23⁄16" 4 2 11⁄2 1 1⁄2 1⁄2 1⁄2 1⁄2 1⁄2

(40 – 55)

7⁄16" thru 37⁄16" 3 11⁄2 1 1⁄2 1⁄2 1⁄4 1⁄4

(60 – 85)

15⁄16" thru 415⁄16" 21⁄2 1 1⁄2 1⁄4

(90 – 125)

Figure 10. Safety & Lubrication Instructions for Fans

with Unit Roller Bearings

WARNING

1. This equipment must not be operated without proper guarding of

all moving parts. While performing maintenance be sure remote

power switches are locked off. See installation manual for recom-

mended safety practices.

2. Before starting: Check all setscrews for tightness and rotate wheel

by hand to make sure it has not moved in transit.

* Suggested lubrication interval under ideal continuous operating con-

ditions. Relubricate while running, if safety permits, until some purging

occurs at seals. Adjust lubrication frequency depending on conditions

of purged grease. Use one-half of listed interval for vertical shaft appli-

cations or for 24 hour operation. Hours of operation, temperature, and

surrounding conditions will affect the relubrication frequency required.

1. Lubricate with a high quality NLGI No. 2 lithium-base grease hav-

ing rust inhibitors and antioxidant additives, and a minimum oil

viscosity of 500 SUS at 100°F (38°C). Some greases having these

properties are:

Shell - Gadus S2 V100 2 Exxon - Ronex MP

Mobil - Mobilith SHC100 Mobil - Mobilith SHC220

2. Lubricate bearings prior to extended shutdown or storage and

rotate shaft monthly to aid corrosion protection.

Figure 9. Safety & Lubrication Instructions for Fans

with Ball Bearings

Relubrication Schedule (Months)*

Ball Bearing Pillow Blocks

Speed (RPM)

Shaft DIA

500 1000 1500 2000 2500 3000 3500 4000 4500

1⁄2" thru 111⁄16" 6 6 5 3 3 2 2 2 1

(13 – 45)

15⁄16" thru 27⁄16" 6 5 4 2 2 1 1 1 1

(50 – 60)

11⁄16" thru 215⁄16" 5 4 3 2 1 1 1

(65 – 75)

7⁄16" thru 315⁄16" 4 3 2 1 1

(80 – 100)

Twin City Engineering Supplement ES-52 7

bearings with split pillow block housings. Observation of

the condition of the grease expelled from unit ball or

roller bearings at the time of relubrication is the best

guide as to whether regreasing intervals and the amount

of grease added should be altered. This observation is

particularly important when bearings operate continuous-

ly over 160°F. Spherical roller bearings with split pillow

block housing should be lubricated until grease purges

or overheating may result. Follow the lubrication interval

and amount noted in Figure 11. Spherical roller bearings

with split pillow block housings should be serviced once

per year. Remove cap, clean out old grease and replace,

filling the bottom half of the housing 1/3 full.

Greases are made with different bases. There are

synthetic base greases, lithium base, sodium base, etc.

Avoid mixing greases with different bases. They could be

incompatible and result in rapid deterioration or break-

down of the grease.

All bearings are filled with grease before leaving the

factory. When the fans are started, the bearings may

discharge excess grease through the seals for a short

period of time. Do not replace the initial discharge

because leakage will cease when the excess grease has

worked out. Sometimes the bearing has a tendency to

run hotter during this period and one should not get

alarmed unless it lasts over 48 hours or gets above

220ºF. When relubricating, use a sufficient amount of

grease to purge the seals. Rotate bearings during relu-

brication where good safety practice permits.

For bearings with oil lubrication, sight gauges are installed

so that a proper level can be reviewed and maintained.

Sight gauges should be read with bearings not rotating.

Wheel and Shaft Maintenance

Periodically inspect the shaft and wheel for dirt buildup,

corrosion, and signs of excess stress or fatigue. Clean

the components and, when appropriate, apply new coat-

ings. (Any addition of coatings or weld can create an

imbalance.) Check the balance of the assembly.

Structural Maintenance

All structural components or devices used to support or

attach the fan to a structure should be checked at regu-

lar intervals. Vibration isolators, bolts, foundations, etc.,

are subject to failure from corrosion, erosion, and other

causes. Improper mounting can lead to poor operation

characteristics or fan fatigue and failure.

Check metallic components for corrosion, cracks, or

other signs of stress. Concrete should be checked to

ensure the structural integrity of the foundation.

Troubleshooting Guidelines

Use current safety practices when investigating fan or

system performance problems. General safe practices

and performance troubleshooting guidelines can be

found in AMCA Publications 410 and 202, respectively.

Fan application and field measurement procedures can

be found in AMCA Publications 201 and 203.

Troubleshooting Performance Problems

The lists below indicate possible areas to check when air

or sound values do not match expectations. Most fan prob-

lems can be pinpointed to one of these common causes.

Air Capacity Problems:

1. Resistance of system not at design rating. If resis-

tance is lower than expected, both airflow and

horsepower may be up. If resistance is higher than

anticipated, air volume will be down.

2. Fan speed is not at design speed.

3. Air density not at design values. Also check air per-

formance measurement techniques/procedures.

4. Devices for air modulation are closed or plugged.

Also check filters.

5. Wheel mounted improperly or is rotating in reverse.

6. Parts of system or fan have been damaged or need

cleaning.

Noise Problems:

1. Air performance is incorrect and fan is not at design

point of operation. Fan forced to operate in an

unstable flow region.

2. Bearing failure. Check bearings (lubrication).

3. Supply voltage high or inconsistent supply frequency.

Adjustable frequency controllers can generate motor

noise.

4. Objects which are installed in a high velocity air-

stream can generate noise. This includes flow sen-

sors, turning vanes, etc.

5. Poor fan inlet conditions.

6. Acoustics or sound measurement procedure incorrect.

Vibration Problems:

1. Misalignment of drive components.

2. Poor foundations or mounting structure (resonances).

3. Foreign material attached to rotating components.

4. Damaged rotating components (bearings, shaft, fan,

wheel, sheaves).

5. Broken, loose or missing setscrews.

6. Loose bolts.

7. Vibration transmitted by another source.

8. Water accumulating in airfoil blades.

9. Fan is operating in stall or unstable flow region.

NOTE: All fans manufactured by Twin City Fan &

Blower are factory balanced prior to shipment. Handling

and movement of the fan during shipment may cause

the rotating assembly to shift. Balance should be

checked once the fan is installed. If a final trim balance

is required, it is the end user's responsibility to bring the

fan back to factory specifications. Final trim balancing is

not the responsibility of Twin City Fan & Blower. Refer

to Figure 12 for vibration guidelines.

Motor Problems:

1. Incorrect wiring.

2. Speed of fan too high.

3. Parts improperly installed - binding.

4. Bearings improperly lubricated.

5. WR2 capability of motor too low for application.

6. Protection devices may be improperly sized.

Drive Problems:

1. Belts improperly tensioned.

2. Drive alignment is poor.

Condition

Fan

Application

Category

Rigidly Mounted

mm/s (in./s)

Flexibly Mounted

mm/s (in./s)

Start-up

BV-3 6.4 (0.25) 8.8 (0.35)

BV-4 4.1 (0.16) 6.4 (0.25)

Alarm

BV-3 10.2 (0.40) 16.5 (0.65)

BV-4 6.4 (0.25) 10.2 (0.40)

Shutdown

BV-3 12.7 (0.50) 17.8 (0.70)

BV-4 10.2 (0.40) 15.2 (0.60)

Figure 12. Vibration Guidelines

Value shown are peak velocity, mm/s (inches/s), Filter out.

Table taken from ANSI/AMCA Standard 204-05, Table 6.3.

AMCA defines BV-3 for applications up to 400 HP; BV-4 for applica-

tions over 400 HP.

Bearing Problems:

Generally speaking, Twin City Fan & Blower uses three

types of bearings:

1. Ball bearing with set screw lock.

2. Spherical roller bearings with set screw lock.

3. Spherical roller bearings with adapter lock/taper lock

feature to attach them to the shaft.

Ball bearings – These are self-aligning bearings and

should present no alignment problems with one excep-

tion: i.e., on Sealmaster bearings there is a pin beneath

the grease fitting which prevents the bearings outer race

from rotating. Should this pin jam, the bearing loses its

alignment feature.

Common failure causes are (1) set screws loosening

and shaft turning within the bearing, and (2) crowned

bearing supports. Loosen one bolt and measure the

clearance between the pillow block and the support.

Add shim to compensate.

Spherical Roller Bearings with Set Screw Lock – The

self-aligning characteristic of these bearings are inherent

in the spherical roller design. The closer that these bear-

ings are to perfect alignment, the cooler they will operate.

Common failure causes are the same as with ball

bearings, mainly set screws loosening and crowned

bearing supports.

Spherical Roller Bearings with Adapter Lock – Again,

the self-aligning feature is inherent in the spherical

design. Good alignment results in a cooler operating

bearing. The faster the bearing operates the more criti-

cal this becomes.

A common cause of failure is improper installation

practice. Removing too much clearance from the bearing

can result in preloading the bearing, resulting in prema-

ture failure; and removing not enough can result in the

shaft rotating within the bearing. Properly tightened, this

method of attaching a bearing to a shaft is second only

to a press fit. Crowned bearing supports can also pre-

load these bearings and should be checked by loosening

one side of the bearing and checking for clearance.

Lubrication – The major cause of bearing failure is

contamination of grease, insufficient grease, or incompat-

ibility of grease. If a fan is to be stored for any length

of time at the job site, the bearings immediately should

be filled with grease while rotating the shaft and then

the bearings should be regreased and rotated monthly.

This will prevent moisture, which condenses within the

bearing, from corroding the raceways. Most greases

used on fan pillow blocks are lithium base. Use the

greases shown on the bearing decal. Do not mix the

bases without completely purging out the initial grease.

Initially, follow the lubrication instruction on the side

of the fan. The frequency of lubrication should be

adjusted depending on the condition of the old grease

being purged. This is the responsibility of the user. If

the grease is dirty, the lubrication frequency should be

more often.

a. Noise – If a bearing is increasing in noise intensity

and/or vibration, it will probably result in failure.

b. Temperature – If a bearing temperature begins to

gradually rise, it will generally result in failure. A

bearing can operate up to 200 degrees and operate

satisfactorily if the temperature remains constant and

the bearing receives adequate lubrication. Remember

that a roller bearing under the same load and speed

will be somewhat more noisy and run warmer than a

ball bearing. This is normal.

Rough handling and/or dropping a fan can result in bri-

nelling the bearing. This appears as a clicking noise at

first, then gradually worsens until failure.

When replacing a bearing, always align the bearings

first, then bolt the pillow blocks to their support, rotate

the shaft, fasten the bearings to it. If the bearing is

fastened to the shaft first, tightening the pillow block

bolts may bind the shaft and preload the bearings.

Limitation of Warranties and Claims

Seller warrants to the original purchaser that the goods

sold hereunder shall be free from defects in workman-

ship and material under normal use and service (except

in those cases where the materials are supplied by the

buyer) for a period of one year from the date of original

installation or eighteen (18) months from the date of

shipment, whichever occurs first. The liability of seller

under this warranty is limited to replacing, repairing, or

issuing credit (at cost, F.O.B. factory and at seller’s

discretion) for any part or parts which are returned by

buyer during such period provided that:

a. seller is notified in writing within ten (10) days fol-

lowing discovery of such defects by buyer, or within

ten (10) days after such defects should reasonably

have been discovered, whichever is less;

b. the defective unit is returned to seller, transportation

charges prepaid by buyer.

c. payment in full has been received by seller or said

products; and

d. seller’s examination of such unit shall disclose to its

satisfaction that such defects have not been caused

by misuse, neglect, improper installation, repair,

alteration, act of God, or accident.

e. seller cannot guarantee sound pressure levels or

dBA.

No warranty made hereunder shall extend to any seller

product whose serial number is altered, effaced or

removed. Seller makes no warranty, express or implied,

with respect to motors, switches, controls, or other

components of seller’s product, where such components

are warranted separately by their respective manufac-

turers. THIS WARRANTY IS EXPRESSLY IN LIEU OF

ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,

WHETHER STATUTORY OR OTHERWISE, INCLUDING

ANY IMPLIED WARRANTY OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR PURPOSE. In no event

shall seller be liable to buyer for indirect, inciden-

tal collateral, or consequential damages of any kind.

(BUYER’S FAILURE TO PAY THE FULL AMOUNT DUE

WITHIN SIXTY (60) DAYS OF DATE OF INVOICE SHALL

OPERATE TO RELEASE SELLER FROM ANY AND ALL

LIABILITY OR OBLIGATION ARISING PURSUANT TO

ANY WARRANTY, EXPRESS OR IMPLIED, WHETHER

STATUTORY OR OTHERWISE, INCLUDING ANY IMPLIED

WARRANTY OR MERCHANTABILITY OR FITNESS FOR

A PARTICULAR PURPOSE, MADE IN CONNECTION

WITH ANY CONTRACT FORMED HEREUNDER. BUYER

AGREES THAT SUCH FAILURE TO PAY SHALL

CONSTITUTE A VOLUNTARY WAIVER OF ANY AND ALL

SUCH WARRANTIES ARISING PURSUANT TO SUCH

CONTACT.)

15MWG06/14

TWIN CITY FAN & BLOWER | WWW.TCF.COM

5959 Trenton Lane N | Minneapolis, MN 55442 | Phone: 763-551-7600 | Fax: 763-551-7601

Receiving, Inspection & Unpacking

General Installation

When the equipment is received all items should be carefully checked against the bill of lading to be sure all crates

and cartons have been received. Before accepting delivery, carefully inspect each carton or crate for visible shipping

damage. If any damage is noticed, the carrier should make the proper notation on the delivery receipt acknowledging

the damage. Make notations of all damage on all copies of the bill of lading and have all copies countersigned by

the delivering carrier. The carrier should also fill out a Carrier Inspection Report. The factory Traffic Department should

then be contacted. File claim for damage with the carrier. Physical damage to the unit after acceptance is not the

responsibility of Twin City Fan Companies, Ltd.

Unpack each carton or crate and verify that all required parts and proper quantities of each item have been received.

Refer to drawings for part descriptions. Report shortages or missing items to your local representative to arrange for

replacement parts.

Due to availability of carriers and truck space, it is not possible to guarantee that all items will be shipped together.

Verification of shipments must be limited to only those items on the bill of lading.

The unit nameplate must be checked to make sure the voltage agrees with the power supply available.

CAUTION: Sheet metal parts, screws, clips and similar items inherently have sharp edges, and it is necessary that the

installer and service personnel exercise caution.

The installation of this equipment shall be in accordance with the regulations of authorities having jurisdiction and all

applicable codes.

This equipment is to be installed by an experienced installation company and fully trained personnel.

The mechanical installation of the exhaust ventilator consists of making final connections between the unit and build-

ing services, duct connections.

Nomenclature

B CR U R - 120

D = Direct Drive

B = Belt Driven

CR = Centrifugal Roof Exhauster

CL = Centrifugal Low Profile

D = Downblast

U = Upblast

W = Wall Exhauster

H = Hooded

P = Penthouse (Louvered)

Fan Size

R = Restaurant

SH = Smoke & Heat

Models

DCLH, DCLP, DCRD, DCRU, DCRUR, DCRW, DCRWR

BCLH, BCLP, BCRD, BCRD-E, BCRU, BCRUR, BCRW, BCRWR, BCRUSH

Twin City Fan & Blower Catalogs 4050, 4105 and 4135 provide additional information on this equipment. These cata-

logs can be found at www.tcf.com or by contacting your local Twin City Fan & Blower sales representative.

IM-4050

August 2014

Centrifugal Powered

Roof & Wall Exhausters

INSTALLATION, OPERATION & MAINTENANCE MANUAL

2 Twin City IM-4050

Wall Fan Installation

1. Your wall fan is shipped with a wall mounting brack-

et. Refer to the wall fan dimensional drawing on

page 4 for mounting hole locations. Consideration

should be taken when choosing wall fan location

with regard to other buildings, parking lots, etc.

2. After drilling pilot holes, bolt the wall mounting

bracket to the wall through the holes provided on

the bracket flange using eight (8) lag bolts.

3. Position fan with the motor compartment breather

tube facing downward. NOTE: On Models BCRWR

and DCRWR, the breather tube can be facing

downward or towards either side. Do not install with

breather tube facing up.

4. Run wires through conduit to switch. Leave some

slack in the wire in the motor compartment so that

the motor and wheel assembly can be lifted for

inspection and cleaning. If fan has an external dis-

connect switch (standard on restaurant units) bring

power to switch.

5. Bolt the fan base to the wall bracket using hardware

provided.

6. Make connection to the disconnect switch per

above electrical instructions.

7. Restaurant fan installation must be in compliance

with local codes and the National Fire Protection

Association’s NFPA-96.

8. Models DCLH, DCLP, DCRD, DCRU, DCRUR,

BCLH, BCLP, BCRD, BCRD-E, BCRU, BCRUR and

BCRUSH are not designed to be mounted to a wall.

Electrical Connection

1. Connect supply wiring to the disconnect switch

(non-fused standard). Check the wiring diagrams on

the motor for connections.

2. The motor is factory set at the voltage marked on

the fan nameplate. Check the line voltage with the

nameplate voltage and wiring diagrams.

3. The main power wiring should be sized for the

ampacity shown on the dataplate. Size wires in

accordance with the ampacity tables in Article 310

of the National Electrical Code. If long wires are

required, it may be necessary to increase wire size

to prevent excessive voltage drop. Wires should be

sized for a maximum of 3% voltage drop.

CAUTION: Use copper conductors only.

CAUTION: Protect wiring from sharp edges. Leave

some slack in the line to prevent damage.

4. Disconnect switches are not fused. The power leads

must be protected at the point of distribution in

accordance with the fan dataplate.

5. On fans without a thermal protector integral to the

motor (refer to unit or motor dataplate to determine

if protector is present) a separate overload device

is required. Refer to Sections 430-32 of the N.E.C.

for sizing.

6. All units must be electrically grounded in accordance

with local codes or, in the absence of local codes,

with the latest edition of the National Electrical

Code (ANSI/NFPA 70). A ground lug is provided as

standard in the unit terminal box. Size grounding

conductor in accordance with Table 250-95 of the

National Electrical Code. DO NOT use the ground

lug for connecting a neutral conductor.

7. Supply voltage to the power ventilator should not

vary by more than 10% of the value indicated

on the unit dataplate. Phase unbalance must not

exceed 2%.

WARNING: Failure of motor due to operation on

improper line voltage or with excessive phase unbal-

ance constitutes product abuse and may cause

severe damage to the unit’s electrical components.

SIZE SHIP MOTOR LOOSE

070D – 160D

100HP – 160HP

• Motor HP larger than shown on TCF&B Price

List P-4105

180D – 240D

180HP – 210HP

• 143T and larger – ODP/TE Cast iron frames

• 145T and larger – ODP/TE Rolled frames

• 143T and larger – Explosion-proof motors

300D – 360D

240HP – 300HP

• 182T and larger – ODP/TE Cast iron frames

• 184T and larger – ODP/TE Rolled frames

• 182T and larger – Explosion-proof motors

420D – 480D

360HP, 540

• 184T and larger – ODP/TE Cast iron frames

• 213T and larger – ODP/TE Rolled frames

• 184T and larger – Explosion-proof motors

BCRD, BCRD-E, BCLH, BCLP

Larger motors will ship loose in order to prevent shipping damage, per the following charts.

SIZE SHIP MOTOR LOOSE

110B – 160B

140HP – 160HP

• 143T and larger – ODP/TE Cast iron frames

• 145T and larger – ODP/TE Rolled frames

• 143T and larger – Explosion-proof motors

180B – 240B

180HP

• 145T and larger – ODP/TE Cast iron frames

• 182T and larger – ODP/TE Rolled frames

• 145T and larger – Explosion-proof motors

300B – 360B

210HP – 300HP

• 182T and larger – ODP/TE Cast iron frames

• 184T and larger – ODP/TE Rolled frames

• 182T and larger – Explosion-proof motors

420B – 480B

360HP

• 184T and larger – ODP/TE Cast iron frames

• 213T and larger – ODP/TE Rolled frames

• 184T and larger – Explosion-proof motors

BCRU, BCRUR, BCRUSH, BCRW, BCRWR

Shipment of Motors

Twin City IM-4050 3

Roof Fan Installation

Downblast Fans:

1. Position the fan with its wiring conduit in line with

the wiring coming up through the roof curb and

damper (if present). If the fan has an external dis-

connect switch, position the fan with the junction

box towards the power supply.

Upblast Fans:

1. Position the fan with its wiring conduit, coming

through the outer fan housing or its external discon-

nect, towards the power supply.

2. Run wires through the conduit to the switch. Leave

some slack in the wire in the motor compartment

so the motor and wheel assembly can be lifted for

inspection and cleaning.

3. Bolt the fan base to the roof curb through the holes

provided on the base using eight (8) lag bolts.

4. Make connection to the disconnect switch per

above electrical instructions.

5. Restaurant fan installation must be in compliance

with local codes and the National Fire Protection

Association’s NFPA-96.

Table 2. Wheel to Inlet Venturi

* all sizes except 070 and 075.

** all other sizes, including 160/180 BMP/BHP.

Check, Test & Start Procedure

WARNING

Electric shock hazard. Could cause severe injury or

death. Failure to bond the frame of this equipment

to the building electrical ground by use of the

grounding terminal provided or other acceptable

means may result in electrical shock. Disconnect

electric power before servicing equipment. Service

to be performed only by qualified personnel.

BEFORE START-UP: Disconnect power to this unit

before servicing the unit.

1. Check to verify that the wheel is free to rotate.

2. For optimum fan performance make sure that the

wheel to inlet venturi gap or overlap is maintainted.

See Table 2.

3. Verify that supply voltage on the line side of discon-

nect agrees with voltage on fan data plate and is

within the 10% utilization voltage.

4. Apply power to unit and check rotation of wheel with

the directional arrow on the unit. See Table 1.

WARNING: Rotation is critical. If allowed to operate

in the wrong direction, the motor will overload and

burn out.

WARNING: Especially check three-phase units for

rotation. For three-phase, rotation can be changed by

interchanging any two of the three line leads. If unit is

checked on temporary wiring, it should be rechecked

when permanently installed. Motor burn-out or tripped

overload protection devices are usually the result of

wrong rotation.

5. Electrical Input Check: Perform check of fan ampere

draw and verify that motor nameplate amps are not

exceeded. Take into account the service factor range

if motor is nameplated above a 1.0 service factor.

6. Fan RPM should be checked and verified with a

tachometer.

7. Units with Speed Control (Direct Drive): Verify that

speed controller gives desired operating range of

RPM. If minimum speed value is not desired, it may

be adjusted. See page 4.

NOTE: The fan should not need balancing, as it was

balanced at the factory to be within stringent vibration

levels before shipment. However, there are several

things that may cause vibration, such as rough han-

dling in shipment and installation, weak foundations

and alignments.

Table 1. Wheel Rotation*

* Wheel rotation is determined when viewed from top of fan

(opposite air intake).

Note: On fans with three phase motors the wheel rotation can

be changed by reversing any two power leads.

Figure 1. Fan Wheel Rotation - View from Exhaust End

CURB

BASE

FAN

WHEEL

HOUSING

Note: CCW rotation shown, CW rotation is similar but opposite.

MODEL CCW CW

BCRD/BCRD-E 070, 075 all other

BCRU/UR/USH/W/WR 160, 180 all other

BCLH/BCLP 070, 075 all other

DCRD all ---

DCRU/UR/W/WR all ---

DCLH/DCLP all ---

MODEL GAP OVERLAP

BCRD/BCRD-E 070D, 075D --- 0.25

BCRD/BCRD-E* --- 0.50

BCLH/BCLP --- 0.50

BCRU/UR/USH/W/WR 160B, 180B 0.06 ---

BCRU/UR/USH/W/WR** --- 0.50

BCRU/UR/USH/W/WR 420B, 480B --- 0.75

DCRD 0.25 ---

DCLH/DCLP 0.25 ---

DCRU/UR/W/WR 0.06 ---

4 Twin City IM-4050

Figure 3. Low End Setpoint Adjustment

NOTE: 5 amp model shown. On 10 and 15

amp models, adjustment is made through clear-

ance hole in heat sink.

SETPOINT

ADJUSTMENT

SCREW

Table 4. Speed Controller Size

Speed Control Installation

(Models DCLH, DCLP, DCRD, DCRU, DCRUR, DCRW, DCRWR - optional)

Speed control is available using 115/60/1 open type

PSC or shaded pole motors.

Installation

Connect control in series with motor and line voltage

(115V only). Never connect across line. See Figure 2.

Minimum Speed Setpoint

All controls are factory set to 65V±3V output as stan-

dard with an input voltage of 120V. If different minimum

speed is desired, the control may be adjusted by turn-

ing minimum speed pot clockwise to decrease minimum

speed and counterclockwise to increase minimum speed.

Refer to Figure 3.

Warning: If minimum speed is readjusted, verify unit

ampere draw does not exceed motor nameplate amps.

Do not operate unit in range where amp draw exceeds

motor nameplate.

Caution: These motors operate more efficiently in the

ranges set from the factory. Operating motor outside

these ranges (see Table 3) may cause motor to run

hotter and substantially shorten motor life.

Note: Lowering the minimum speed setpoint may

adversely affect motor start-up characteristics.

Warning: Certain failure modes of solid-state controls

such as half-waving can cause high levels of DC, motor

overheating and motor burn-out. Therefore, a thermal

overload protection (integral with motor) is required to

limit the maximum motor temperature under such a

failure.

Note: Do not allow any sleeve bearing motor to operate

below 500 RPM. Operation below 500 RPM will sub-

stantially shorten bearing life.

Figure 2. Connection Diagram, Speed Control

SPEED CONTROLLER

LINE

(115V)

SWITCH TRI-AC

MOTOR

Table 3. Speed Controller RPM Range

HP RPM MAX. RPM MIN. RPM

1/30 1650/1500/13502,3 1650413004

1/8 150059505

1/15

860 860 500

1/8

1/6

1/4

1/2

1/8

1140 1140 900

1/6

1/4

1/2

1/3

1725 1725 1200

1/2

3/4

NOTES:

• Speed control available only with 115/60/1 open motors (thermally

protected).

• Three-speed motor (multiple tap winding).

• Speed control should not be connected to low speed tap on motor

because of starting characteristics.

• Speed control connected to high speed tap on motor.

• Speed control connected to medium speed tap on motor.

MOTOR SPEED CONTROLLER

DESIGNATION / FLA

PART

NUMBER

ENCLO-

SURE

VOLT-

AGE HP RPM KBWC-15K

5 AMP

KBWC-110

10 AMP

KBWC-115

15 AMP

66543600 Open 115V 1/8 1650/1500/

1350 X

66804500 Open 115V 1/15 860 X

66543700 Open 115V 1/8 860 X

67123100 Open 115V 1/6 860 X

66543800 Open 115V 1/4 860 X

66543900 Open 115V 1/2 860 X

66804600 Open 115V 1/8 1140 X

67125100 Open 115V 1/6 1140 X

66544000 Open 115V 1/4 1140 X

66544100 Open 115V 1/2 1140 X

66544200 Open 115V 1 1140 X

66544300 Open 115V 1/3 1725 X

66544400 Open 115V 1/2 1725 X

67122500 Open 115V 3/4 1725 X

Twin City IM-4050 5

Figure 4. Eliminate Slack Figure 5. Belt Deflection

Figure 6. Alignment Figure 7. Two-Groove Sheaves (Pulleys)

Figure 8. Belts

Deflection

Deflection = Belt Span

Belt Span

Slack belts wear excessively, cause slippage

and deliver less power. For longest belt life,

always provide proper tension

Mount belts straight. Shafts must be parallel

and sheaves in alignment to prevent unnec-

essary belt wear.

Two-groove variable pitch

sheaves must be opened the

same number of turns on

both sides; otherwise, slip-

page occurs, wearing belts

rapidly.

Do not force belt. Forcing the belt will

break the cords and cause belt failure.

V-Belts

V-belts on these belt driven fans are oil, heat, and static

resistant type and oversized for continuous duty. With

proper installation and maintenance, years of operating

efficiency can be added to the lifespan of the V-belt

drive.

The condition of V-belts and the amount of belt ten-

sion should be checked prior to start-up (see Figure

4). When it becomes necessary to adjust belt tension,

do not over-tension as bearing damage will occur.

Recommended belt tension should permit 1⁄64" deflection

per inch of span of the belt at the center of the belt

span. To find this point, measure halfway between the

pulley centerlines as shown in Figure 5. Extreme care

must be exercised when adjusting V-belts as not to mis-

align the pulleys. Any misalignment will cause a sharp

reduction in belt life and will also produce squeaky,

annoying noises (see Figure 6). On units equipped with 2

groove pulleys, adjustments must be made so that there

is equal tension on all belts (see Figure 7).

1. Where tensioning rods are not provided, adjustment is

more easily obtained by loosening and adjusting one

side of the motor bracket at a time.

2. Always loosen tension adjustment enough to place

belts on sheaves without running belts over the edge

of either sheave. A new belt may be seriously dam-

aged internally by careless handling (see Figure 8).

WARNING: When removing or installing belts, never

force belts over pulleys without loosening motor first to

relieve belt tension.

3. Fan speed can be increased by closing the adjust-

able motor pulley or decreased by opening it. Always

check the load on the motor when increasing the fan

speed.

CORRECT

INCORRECT

6 Twin City IM-4050

Three-Pulley (Idler Sheave) Assembly

Single bolt belt adjustment (Figure 9) can be made by

loosening the idler sheave bolt (with 3/4" wrenches) and

moving it to the point where proper tension is achieved,

per Page 5, Figure 5. Alignment is necessary prior to

belt adjustment. See Figure 6.

This configuration is standard on BCRD sizes 070-160

and BCRU (family) sizes 110-180. All other adjustments

are made by moving the motor.

IDLER SHEAVE FAN SHEAVE

MOTOR SHEAVE

MOTOR

Figure 9. Three-Pulley (Idler Sheave) Assembly

Maintenance

Installation and maintenance are to be performed only

by qualified personnel who are familiar with local codes

and regulations and experienced with this type of equip-

ment.

CAUTION: Sharp edges and screws are a potential injury

hazard. Avoid them.

WARNING

Hazardous moving parts. Unit may contain pro-

tected fan motor which may start automatically

and cause injury. Allow time for reset. Disconnect

power before servicing.

Preventive maintenance is the best way to avoid unnec-

essary expense and inconvenience. Start-up and routine

maintenance should cover the following items:

a. Tighten all setscrews, bolts and wire connections.

b. Check belt tension and sheaves for wear.

c. Lubricate fan bearings (see Tables 5 and 6).

d. Cleaning of unit, wheel and damper (if present).

All motors containing ball bearings are permanently

lubricated from the factory. No additional maintenance

is required.

1. Before performing any maintenance on the fan, be

sure power is turned off and locked in the OFF

position at the service entrance.

2. Ventilators should be carefully checked at least once

a year. For critical or rugged applications, a routine

check every two or three months is suggested.

3. All motors supplied with Twin City Fan & Blower

ventilators carry a one-year limited warranty from

date of shipment. For repairs within the warranty

period, the motor must be taken to the motor

manufacturer’s authorized service dealer. Contact

your representative for additional warranty details.

4. A periodic motor check should consist of spinning

the motor shaft with the power off to be sure the

motor turns freely and the bearings run smoothly.

The belt on belt driven units should be removed

from the motor sheave.

5. When removing or installing a belt, do not force

the belt over the sheave. Loosen the motor mount

so that the belt can be easily slipped over the

sheave.

6. The belt on belt driven units should be removed and

carefully checked for glazing, cracks, ply separation

or irregular wear. A small irregularity in the contact

surface of the belt will result in noisy operation. If

any of these defects are apparent, the belt should

be replaced. Check the sheaves also for chipping,

dents or rough surfaces which could damage the

belt.

7. The correct belt tension is important. Too tight of

a belt will result in excess bearing pressure on the

motor bearings and shaft pillow blocks and may

also overload the motor. Too loose of a belt will

result in slippage which will quickly “burn” out belts.

A belt should feel “live” when thumped, approxi-

mately 1⁄4" belt deflection (3 to 5 lb.) when subject

to finger pressure at midpoint between sheaves.

8. The belt alignment should also be checked to be

sure the belt is running perpendicularly to the rotat-

ing shafts. Fan and motor shafts must be paral-

lel. Improper alignment will result in excessive belt

wear.

9. Check sheave setscrews to ensure tightness. Proper

keys must be in keyways.

10. Do not readjust fan RPM. If sheaves are replaced,

use only sheaves of identical size and type.

11. If unit is to be left idle for an extended period, it is

recommended that belts be removed and stored in

a cool, dry place to avoid premature belt failure.

Twin City IM-4050 7

OIL TUBES

Figure 10. Sleeve Bearing Motor Oil Tube Location

Storage

If fans are stored for any length of time, they should be stored in a clean, dry location to prevent rust and corro-

sion. Outdoor storage is not recommended. When outdoor storage is necessary, fans should be protected from the

elements as completely as possible. Cover the fan inlet and outlet and keep motors dry and clean.

For extended storage (more than 3 months) motor shafts and bearings should be rotated monthly. If stored longer

than 6 months, bearing grease in motor and fan should be purged and replaced with compatible grease. Belts should

be rechecked for proper tension. Storage records should be kept to assure proper maintenance. The factory can

advise warranty centers to provide motor and bearing service if needed.

Table 5. Suggested Fan Bearing Greasing Intervals

INTERVAL TYPE OF SERVICE

(MONTHS)

12 to 18 Infrequent operation or light duty in clean atmosphere.

6 to 12 8 to 16 hrs./day in clean, relatively dry atmosphere.

3 to 6 12 to 24 hrs./day, heavy duty, or if moisture is present.

1 to 3 Heavy duty in dirty, dusty locations; high ambient

temperatures; moisture laden atmosphere; vibration.

Table 6. Grease Manufacturers

MANUFACTURER GREASE (NLGI #2)

Shell Gadus S2 V100 2 or equivalent

Exxon/Mobil Ronex MP

12. The standard pillow block bearings on belt driven

ventilators are factory lubricated and are provided with

external grease fittings. Lubrication annually is recom-

mended, or more frequently if needed (see Table 5).

It is recommended to add fresh grease at start-

up, but do not over-grease. Use only 1 or 2 shots

of a recommended lubricant with a hand gun in

most cases (see Table 6). Maximum hand gun rating

40 P.S.I. Rotate bearings during lubrication where

good safety practice permits.

CAUTION: Greases of different soap bases

(lithium, sodium, etc.) may not be compatible when

mixed. Prevent such intermixing by completely purg-

ing the bearing of old greases.

The most frequent causes of bearing failure are

not greasing often enough, using an excessive

quantity of grease, or using incompatible greases.

Excessive vibration, especially if the bearing is not

rotating, will also cause bearings to fail. Bearings

must also be protected from water and moisture to

avoid internal corrosion.

13. During the first few months of operation it is rec-

ommended that the bearing setscrews be checked

periodically to ensure that they are tight.

14. The rotating wheel requires particular attention since

materials in the air being handled can build up on

the blades to cause destructive vibration or weaken

the structure of the wheel by corroding and/or erod-

ing the blade metal. Regular inspection and correc-

tive action at intervals determined by the severity of

each application are essential to good service life

and safety.

Motor Lubrication

Motors which contain ball bearings are permanently

lubricated from the factory. No additional maintenance

is required.

Motors which contain sleeve bearings require lubrication

every six (6) months. Use SAE-20W lubricant and add

five (5) drops to each location shown in Figure 10. DO

NOT OVER LUBRICATE.

8 Twin City IM-4050

Fan Troubleshooting Chart

PROBLEM POSSIBLE CAUSES

FAN DOES NOT OPERATE 1. Wrong voltage.

2. Electricity turned off or not wired properly.

3. Tripped overload protector.

4. Blown fuses.

5. Loose pulleys.

6. Broken belts.

TOO LITTLE AIR 1. Wheel rotating in wrong direction.

2. Fan speed lower than design.

3. System is more restrictive (more static pressure) than expected.

4. Restricted fan inlet or outlet.

5. Inlet or outlet screens clogged.

6. Filters (if applicable) are dirty or clogged.

TOO MUCH AIR 1. Fan speed higher than design.

2. System is less restrictive (less static pressure) than expected.

EXCESSIVE HORSEPOWER 1. Wheel rotating in wrong direction.

2. Wheel rubbing on inlet venturi.

3. Fan speed higher than design.

4. Worn fan bearings.

EXCESSIVE NOISE 1. Wheel or sheaves loose.

2. Bearing or drive misalignment.

3. Accumulation of material on wheel.

4. Worn or corroded wheel.

5. Wheel out of balance.

6. Wheel hitting housing.

7. Bent shaft.

8. Bearings need lubrication.

9. Loose bearing bolts.

10. Loose or worn bearings.

11. Mismatched belts.

12. Belts too loose or too tight.

13. Belts oily or dirty.

14. Belts worn.

15. Loose fan mounting bolts.

16. Rattle of components in high velocity airstream.

17. Electrical noise.

18. Noise from high velocity air system.

19. Vibrating parts not isolated from building.

20. Vibrating ductwork.

EXCESSIVE VIBRATION 1. Wheel or sheaves loose on shaft.

2. Wheel out of balance.

3. Excessive buildup of dirt/dust on wheel.

4. Belts too loose or too tight.

5. Mismatched belts.

6. Bent shaft.

7. Bearing or drive misalignment.

8. Loose or worn bearings.

9. Fan mounting bolts loose.

10. Weak mounting base for fan.

11. Structures not cross-braced (wall fans).

12. Curb not flat and level.

It is recommended that the users and installers of this shipment familiarize themselves with AMCA Publication #201,

“Fans and Systems” and publication #202, “Troubleshooting” which are published by the Air Movement and Control

Association (AMCA), 30 West University Drive, Arlington Heights, Illinois 60004. www.amca.org

Twin City IM-4050 9

Dimensions and Weights

Model DCRD

Model BCRD-E

Model BCRD

A DIA.

2.00"

E SQUARE

ROOF OPENING

(DAMPER SIZE + 0.50 INCHES)

CURB SIZE CURB

DAMPER

ROOF OPENING

(DAMPER SIZE + 0.50 INCHES)

CURB SIZE CURB

DAMPER

2.00"

E SQUARE

A DIA.

2.00

E SQUARE

A DIA.

ROOF OPENING

(DAMPER SIZE + 0.50 INCHES)

CURB SIZE CURB

DAMPER

Note: Self-flashing roof curbs are to be sized 1" larger than canted curbs.

SIZE FAN DIMENSIONS CANTED

CURB SIZE

DAMPER

SIZE

AVG. SHIP

WT. (LBS.)

A B C E

060B 18.50 15.63 2.06 17.00 15.5 x 15.5 10 x 10 30

070B 18.50 15.63 2.06 17.00 15.5 x 15.5 10 x 10 30

080B 18.50 15.63 2.06 17.00 15.5 x 15.5 10 x 10 32

085B 21.00 19.31 2.63 17.00 15.5 x 15.5 10 x 10 43

090B 21.00 19.31 2.63 17.00 15.5 x 15.5 10 x 10 43

095B 21.00 19.31 2.63 17.00 15.5 x 15.5 10 x 10 43

100B 21.00 17.31 2.63 17.00 15.5 x 15.5 10 x 10 48

120B 27.88 22.38 3.63 20.00 18.5 x 18.5 14 x 14 50

130B 27.88 23.25 4.44 24.00 22.5 x 22.5 18 x 18 65

140B 27.88 23.50 4.69 24.00 22.5 x 22.5 18 x 18 67

150B 31.06 26.75 4.63 24.00 22.5 x 22.5 18 x 18 77

160B 31.06 27.25 5.19 24.00 22.5 x 22.5 18 x 18 82

170B 39.63 29.25 4.06 30.00 28.5 x 28.5 24 x 24 95

180B 39.63 30.25 5.06 30.00 28.5 x 28.5 24 x 24 100

SIZE FAN DIMENSIONS CANTED

CURB SIZE

DAMPER

SIZE

AVG. SHIP

WT. (LBS.)

A B C E

070/075D

25.88 22.13 2.06 17.00 15.5 x 15.5 10 x 10 58

085D 27.88 23.94 2.38 17.00 15.5 x 15.5 10 x 10 67

100D 27.88 23.94 2.38 20.00 18.5 x 18.5 14 x 14 74

120D 30.94 28.13 2.56 20.00 18.5 x 18.5 14 x 14 78

140D 30.94 28.25 2.81 24.00 22.5 x 22.5 18 x 18 90

160D 33.81 29.00 3.38 26.00 24.5 x 24.5 20 x 20 107

180D 39.56 33.88 3.75 30.00 28.5 x 28.5 24 x 24 130

210D 39.56 34.06 4.00 30.00 28.5 x 28.5 24 x 24 160

240D 43.00 35.88 4.88 34.00 32.5 x 32.5 28 x 28 220

300D 52.00 38.88 4.88 40.00 38.5 x 38.5 34 x 34 270

360D 61.50 44.38 6.88 46.00 44.5 x 44.5 40 x 40 360

420D 65.75 47.81 7.00 52.00 50.5 x 50.5 46 x 46 420

480D 74.00 50.25 7.75 58.00 56.5 x 56.5 50 x 50 475

SIZE FAN DIMENSIONS CANTED

CURB SIZE

DAMPER

SIZE

AVG. SHIP

WT. (LBS.)

A B C E

070/075D 25.87 21.75 2.03 17.00 15.5 x 15.5 10 x 10 58

085D 27.88 26.25 2.41 17.00 15.5 x 15.5 10 x 10 67

100D 27.88 26.25 2.41 20.00 18.5 x 18.5 14 x 14 74

120D 30.96 29.19 2.56 20.00 18.5 x 18.5 14 x 14 78

140D 30.96 29.44 2.81 24.00 22.5 x 22.5 18 x 18 90

160D 33.81 33.25 3.36 26.00 24.5 x 24.5 20 x 20 107

180D 39.54 36.06 3.75 30.00 28.5 x 28.5 24 x 24 130

210D 39.54 36.31 4.00 30.00 28.5 x 28.5 24 x 24 160

240D 43.00 37.44 4.73 34.00 32.5 x 32.5 28 x 28 220

10 Twin City IM-4050

Dimensions and Weights

Models DCRU/DCRUR

MODEL DAMPER

SIZE

CANTED

CURB SIZE

SELF FLASH

CURB SIZE

BCRU BCRUR

110B 110B 18 x 18 221⁄2 x 221⁄2231⁄2 x 231⁄2

120B 120B 18 x 18 221⁄2 x 221⁄2231⁄2 x 231⁄2

140B 140B 18 x 18 221⁄2 x 221⁄2231⁄2 x 231⁄2

160B 160B 18 x 18 221⁄2 x 221⁄2231⁄2 x 231⁄2

180B 180B 24 x 24 281⁄2 x 281⁄2291⁄2 x 291⁄2

210B 210B 28 x 28 321⁄2 x 321⁄2331⁄2 x 331⁄2

240B 240B 28 x 28 321⁄2 x 321⁄2331⁄2 x 331⁄2

300B 300B 34 x 34 381⁄2 x 381⁄2391⁄2 x 391⁄2

360B 360B 40 x 40 441⁄2 x 441⁄2451⁄2 x 451⁄2

420B — 46 x 46 501⁄2 x 501⁄2511⁄2 x 511⁄2

480B — 50 x 50 561⁄2 x 561⁄2571⁄2 x 571⁄2

MODEL A B C E AVG. SHIP

WT. (LB.)

BCRU BCRUR

110B 110B 30.00 28.56 28.00 24.00 96

120B 120B 30.00 27.19 28.00 24.00 99

140B 140B 30.00 27.68 28.00 24.00 110

160B 160B 30.00 29.81 28.00 24.00 116

180B 180B 36.00 32.31 30.00 30.00 139

210B 210B 45.00 35.61 28.25 34.00 157

240B 240B 45.00 37.56 28.25 34.00 169

300B 300B 54.00 38.25 31.00 40.00 266

360B 360B 63.00 43.88 34.00 46.00 391

420B — 69.00 46.75 36.00 52.00 478

480B — 75.00 49.13 39.00 58.00 523

MODEL DAMPER

SIZE

CANTED

CURB SIZE

SELF FLASH

CURB SIZE

DCRU DCRUR

071B-073B 071B-073B 10 x 10 151⁄2 x 151⁄2161⁄2 x 161⁄2

081B-083B 081B-083B 10 x 10 151⁄2 x 151⁄2161⁄2 x 161⁄2

091B-093B 091B-093B 14 x 14 181⁄2 x 181⁄2191⁄2 x 191⁄2

110B 110B 18 x 18 221⁄2 x 221⁄2231⁄2 x 231⁄2

120B 120B 18 x 18 221⁄2 x 221⁄2231⁄2 x 231⁄2

140B 140B 18 x 18 221⁄2 x 221⁄2231⁄2 x 231⁄2

160B 160B 18 x 18 221⁄2 x 221⁄2231⁄2 x 231⁄2

180B 180B 24 x 24 281⁄2 x 281⁄2291⁄2 x 291⁄2

MODEL A B C E AVG. SHIP

WT. (LB.)

DCRU DCRUR

071B-073B 071B-073B 22.00 24.44 18.00 17.00 100

081B-083B 081B-083B 22.00 24.44 18.00 17.00 100

091B-093B 091B-093B 22.00 26.13 18.00 20.00 120

110B 110B 31.00 28.31 28.00 24.00 135

120B 120B 31.00 27.19 28.00 24.00 135

140B 140B 31.00 27.68 28.00 24.00 145

160B 160B 31.00 29.81 28.00 24.00 180

180B 180B 37.00 29.17 30.00 30.00 180

ROOF OPENING

(DAMPER SIZE + 0.50 INCHES)

DAMPER

(DCRU ONLY)

CURB

2.00

E SQUARE

CURB SIZE

A DIA.

Models BCRU/BCRUR/BCRUSH

ROOF OPENING

(DAMPER SIZE + 0.50 INCHES)

DAMPER

CURB

2.00

E SQUARE

CURB SIZE

A DIA.

(BCRU ONLY)

Notes:

1. Self-flashing, vented restaurant curbs are sized the same as canted

curbs (for use with hinge).

2. Dampers are not to be used with restaurant fans.

Notes:

1. Self-flashing, vented restaurant curbs are sized the same as canted

curbs (for use with hinge).

2. Dampers are not to be used with restaurant fans.

Twin City IM-4050 11

Models DCRW/DCRWR

MOUNTING BRACKET

HOLE MOUNTING PATTERN

5/16" ANCHOR

STUD (8)

6.78 6.78

SQUARE

A DIA.

2.00

MOUNTING

BRACKET

SQUARE

WALL

OPENING

4.00 STD

& 10.00

W/DAMPER

WALL

Dimensions and Weights

Models BCRW/BCRWR

MOUNTING BRACKET

HOLE MOUNTING PATTERN

5/16" ANCHOR

STUD (8)

6.81 6.81

SQUARE

SQUARE A DIA.

2.00

MOUNTING

BRACKET

WALL

OPENING

4.00 STD

& 10.00

W/DAMPER

WALL

MODEL A B C D E AVG. SHIP

WT. (LB.)

DAMPER

SIZE

WALL MTG.

BRACKET

WALL

OPENING (H)

DCRW DCRWR

071B-073B 071B-073B 22.00 24.44 5.00 18.56 17.00 100 10 x 10 163⁄4 x 163⁄4101⁄2 x 101⁄2

081B-083B 081B-083 22.00 24.44 5.00 18.56 17.00 100 10 x 10 163⁄4 x 163⁄4101⁄2 x 101⁄2

091B-093B 091B-093 22.00 26.13 8.00 21.56 20.00 120 14 x 14 193⁄4 x 193⁄4141⁄2 x 141⁄2

110B 110B 30.00 28.31 12.00 25.56 24.00 135 17 x 17 233⁄4 x 233⁄4171⁄2 x 171⁄2

120B 120B 30.00 27.19 12.00 25.56 24.00 135 17 x 17 233⁄4 x 233⁄4171⁄2 x 171⁄2

140B 140B 30.00 27.68 12.00 25.56 24.00 145 17 x 17 233⁄4 x 233⁄4171⁄2 x 171⁄2

160B 160B 30.00 29.81 12.00 25.56 24.00 180 17 x 17 233⁄4 x 233⁄4171⁄2 x 171⁄2

180B 180B 36.00 29.17 18.00 31.56 30.00 180 24 x 24 293⁄4 x 293⁄4241⁄2 x 241⁄2

MODEL A B C D E AVG. SHIP

WT. (LB.)

DAMPER

SIZE

WALL MTG.

BRACKET

WALL

OPENING (H)

BCRW BCRWR

110B 110B 30.00 28.56 12.00 25.56 24.00 135 17 x 17 233⁄4 x 233⁄4171⁄2 x 171⁄2

120B 120B 30.00 27.19 12.00 25.56 24.00 135 17 x 17 233⁄4 x 233⁄4171⁄2 x 171⁄2

140B 140B 30.00 28.56 12.00 25.56 24.00 145 17 x 17 233⁄4 x 233⁄4171⁄2 x 171⁄2

160B 160B 30.00 29.81 12.00 25.56 24.00 180 17 x 17 233⁄4 x 233⁄4171⁄2 x 171⁄2

180B 180B 36.00 32.31 18.00 31.56 30.00 180 24 x 24 293⁄4 x 293⁄4241⁄2 x 241⁄2

210B 210B 45.00 35.61 18.00 35.56 34.00 245 27 x 27 333⁄4 x 333⁄4271⁄2 x 271⁄2

240B 240B 45.00 37.56 22.00 35.56 34.00 245 27 x 27 333⁄4 x 333⁄4271⁄2 x 271⁄2

300B 300B 54.00 38.25 28.00 41.56 40.00 365 33 x 33 393⁄4 x 393⁄4331⁄2 x 331⁄2

12 Twin City IM-4050

Model DCLH

E SQUARE

2.00

Dimensions and Weights

Model BCLH

2.00 TYP

E SQUARE

SIZE A

MAX. B C D E

SQ.

CANTED

CURB

DAMPER

SIZE

AVG. SHIP

WT. (LBS)

60 14.13 26.13 22.00 2.00 17.00 151⁄2 x 151⁄210 x 10 55

70 14.13 26.13 22.00 2.00 17.00 151⁄2 x 151⁄210 x 10 55

80 14.13 26.13 28.00 2.00 17.00 151⁄2 x 151⁄210 x 10 59

85 15.88 26.13 28.00 2.38 17.00 151⁄2 x 151⁄210 x 10 62

90 15.88 26.13 28.00 2.38 17.00 151⁄2 x 151⁄210 x 10 62

95 15.88 26.13 28.00 2.38 17.00 151⁄2 x 151⁄210 x 10 62

100 18.88 26.63 30.00 2.38 17.00 151⁄2 x 151⁄210 x 10 78

120 19.13 26.63 30.00 2.63 20.00 181⁄2 x 181⁄214 x 14 81

SIZE A

MAX. B C D E

SQ. FCANTED

CURB

DAMPER

SIZE

AVG. SHIP

WT. (LBS)

100 17.75 38.63 28.00 3.00 20.00 10.00 181⁄2 x 181⁄214 x 14 110

120 18.50 38.63 28.00 3.75 20.00 10.00 181⁄2 x 181⁄214 x 14 113

140 19.81 39.13 35.00 4.00 24.00 9.38 221⁄2 x 221⁄218 x 18 126

160 20.25 39.13 35.00 4.38 26.00 9.38 241⁄2 x 241⁄220 x 20 131

180 21.13 51.13 40.00 4.38 30.00 10.50 281⁄2 x 281⁄224 x 24 168

210 23.13 51.13 43.00 5.00 30.00 12.00 281⁄2 x 281⁄224 x 24 185

240 23.63 51.13 46.25 5.75 34.00 11.50 321⁄2 x 321⁄228 x 28 203

300 26.75 63.13 52.50 5.50 40.00 11.50 381⁄2 x 381⁄234 x 34 307

360 31.13 63.13 62.50 7.13 46.00 12.75 441⁄2 x 441⁄240 x 40 363

420 33.25 75.13 70.63 8.50 52.00 14.75 501⁄2 x 501⁄246 x 46 488

480 36.13 87.13 75.63 9.25 58.00 14.50 561⁄2 x 561⁄250 x 50 555

540 43.84 87.13 85.50 10.38 64.00 17.00 621⁄2 x 621⁄256 x 56 690

Note: Roof opening = Damper size + 0.50 inches

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