Twin City IM-4050 User Manual
Centrifugal Powered
Roof & Wall Exhausters
INSTALLATION, OPERATION & MAINTENANCE MANUAL
IM-4050
August 2014
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 catalogs can be found at www.tcf.com or by contacting your local Twin City Fan & Blower sales representative.
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
Receiving, Inspection & Unpacking
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.
General Installation
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 building services, duct connections.
©2014 Twin City Fan Companies, Ltd.
Shipment of Motors
Larger motors will ship loose in order to prevent shipping damage, per the following charts.
BCRD, BCRD-E, BCLH, BCLP
SIZE SHIP MOTOR LOOSE
070D – 160D
100HP – 160HP
180D – 240D
180HP – 210HP
300D – 360D
240HP – 300HP
420D – 480D
360HP, 540
• Motor HP larger than shown on TCF&B Price
List P-4105
• 143T and larger – ODP/TE Cast iron frames
• 145T and larger – ODP/TE Rolled frames
• 143T and larger – Explosion-proof motors
• 182T and larger – ODP/TE Cast iron frames
• 184T and larger – ODP/TE Rolled frames
• 182T and larger – Explosion-proof motors
• 184T and larger – ODP/TE Cast iron frames
• 213T and larger – ODP/TE Rolled frames
• 184T and larger – Explosion-proof motors
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.
BCRU, BCRUR, BCRUSH, BCRW, BCRWR
SIZE SHIP MOTOR LOOSE
110B – 160B
140HP – 160HP
180B – 240B
180HP
300B – 360B
210HP – 300HP
420B – 480B
360HP
• 143T and larger – ODP/TE Cast iron frames
• 145T and larger – ODP/TE Rolled frames
• 143T and larger – Explosion-proof motors
• 145T and larger – ODP/TE Cast iron frames
• 182T and larger – ODP/TE Rolled frames
• 145T and larger – Explosion-proof motors
• 182T and larger – ODP/TE Cast iron frames
• 184T and larger – ODP/TE Rolled frames
• 182T and larger – Explosion-proof motors
• 184T and larger – ODP/TE Cast iron frames
• 213T and larger – ODP/TE Rolled frames
• 184T and larger – Explosion-proof motors
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 unbalance constitutes product abuse and may cause
severe damage to the unit’s electrical components.
Wall Fan Installation
1. Your wall fan is shipped with a wall mounting bracket. 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
2 Twin City IM-4050
inspection and cleaning. If fan has an external disconnect 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.
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 disconnect 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 disconnect, towards the power supply.
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.
Table 1. Wheel Rotation*
MODEL CCW CW
BCRD/BCRD-E
BCRU/UR/USH/W/WR
BCLH/BCLP
DCRD
DCRU/UR/W/WR
DCLH/DCLP
* 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
070, 075 all other
160, 180 all other
070, 075 all other
all --all --all ---
R
O
L
E
T
A
E
H
W
T
I
O
N
CURB
BASE
FAN
WHEEL
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.
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 handling in shipment and installation, weak foundations
and alignments.
Table 2. Wheel to Inlet Venturi
MODEL GAP OVERLAP
BCRD/BCRD-E 070D, 075D
BCRD/BCRD-E*
BCLH/BCLP
BCRU/UR/USH/W/WR 160B, 180B
BCRU/UR/USH/W/WR**
BCRU/UR/USH/W/WR 420B, 480B
DCRD
DCLH/DCLP
DCRU/UR/W/WR
* all sizes except 070 and 075.
** all other sizes, including 160/180 BMP/BHP.
--- 0.25
--- 0.50
--- 0.50
0.06 ---
--- 0.50
--- 0.75
0.25 ---
0.25 ---
0.06 ---
HOUSING
Note: CCW rotation shown, CW rotation is similar but opposite.
Twin City IM-4050 3
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 standard with an input voltage of 120V. If different minimum
speed is desired, the control may be adjusted by turning 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 substantially shorten bearing life.
Figure 2. Connection Diagram, Speed Control
SPEED CONTROLLER
AC
LINE
(115V)
SWITCH TRI-AC
MOTOR
Table 3. Speed Controller RPM Range
HP RPM MAX. RPM MIN. RPM
1/30
1/8
1/15
1/8
1/6
1/4
1/2
1/8
1/6
1/4
1/2
1/3
1/2
3/4
NOTES:
• Speed control available only with 115/60/1 open motors (thermally
• Three-speed motor (multiple tap winding).
• Speed control should not be connected to low speed tap on motor
• Speed control connected to high speed tap on motor.
• Speed control connected to medium speed tap on motor.
1650/1500/1350
1140 1140 900
1
1725 1725 1200
protected).
because of starting characteristics.
2,3
860 860 500
1650
1500
4
5
1300
950
4
5
Table 4. Speed Controller Size
MOTOR
PART
NUMBER
66543600 Open 115V 1/8
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
ENCLO-
SURE
VOLT-
AGE
HP RPM
1650/1500/
1350
SPEED CONTROLLER
DESIGNATION / FLA
KBWC-15K
5 AMP
X
KBWC-110
10 AMP
KBWC-115
15 AMP
Figure 3. Low End Setpoint Adjustment
SETPOINT
ADJUSTMENT
SCREW
NOTE: 5 amp model shown. On 10 and 15
amp models, adjustment is made through clearance hole in heat sink.
4 Twin City IM-4050
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 tension 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 misalign the pulleys. Any misalignment will cause a sharp
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 damaged 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 adjustable motor pulley or decreased by opening it. Always
check the load on the motor when increasing the fan
speed.
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).
Figure 4. Eliminate Slack Figure 5. Belt Deflection
Belt Span
Slack belts wear excessively, cause slippage
and deliver less power. For longest belt life,
always provide proper tension
Deflection
Deflection =
64
Belt Span
Figure 6. Alignment Figure 7. Two-Groove Sheaves (Pulleys)
Two-groove variable pitch
CORRECT
sheaves must be opened the
same number of turns on
both sides; otherwise, slippage occurs, wearing belts
rapidly.
INCORRECT
Mount belts straight. Shafts must be parallel
Figure 8. Belts
and sheaves in alignment to prevent unnecessary belt wear.
Do not force belt. Forcing the belt will
break the cords and cause belt failure.
Twin City IM-4050 5
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