Twin City IM-4300 User Manual

BCFS Belt Driven

Centrifugal Filtered Supply Fans

INSTALLATION, OPERATION & MAINTENANCE MANUAL

Models BCFS 140A through 240A

IM-4300

January 2006

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.

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
with 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,
building services, and duct connections.

1. Before setting unit on curb (if damper is to be used),
make sure that the damper is installed correctly and
that it is operative. See diagram, page 6.

2. Position unit on roof curb so that the wiring can be
run through one of the knockouts provided. Wiring to
the unit may be run through knockouts provided in
the curb cap or the side of the unit. Provide enough
slack in the wiring to the unit to allow lifting, and
removal for cleaning, and inspection.

3. Connect supply leads to the disconnect switch.

4. Check line voltage with the motor nameplate and the
attached instruction cards.

5. Determine if wheel is free to rotate and has not been
subject to misalignment in shipping or installation.

6. Apply power and check rotation of wheel with direc­tional label in motor compartment.

7. Lag bolt the unit to the roof curb using a minimum
of four bolts, one at each corner. Replace unit top
panel and fasten all latches securely.

©2006 Twin City Fan Companies, Ltd.

Check, Test and 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 STARTUP: Disconnect power to this unit before
servicing the unit.

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

2. Verify that supply voltage on the line side of discon­nect agrees with voltage on unit identification plate and
is within the utilization voltage range as indicated in
Table 1.

3. On three-phase units check and calculate phase
unbalance as follows:

% Voltage Unbalance = 100 x max. voltage deviation
from avg. voltage ÷ avg. voltage

Example: Determine the percent voltage unbalance

given voltages of 220, 216 and 213.

How To Use The Formula:
a. Avg. Voltage = 220 + 216 + 213 = 649 ÷ 3 = 216
b. Max. Voltage Deviation From Avg. Voltage =

220 – 216 = 4
c. % Voltage Unbalance = 100 x (4 ÷ 216) = 1.8%
Voltage unbalance should not exceed 2%.

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

the directional arrow on the unit.

WARNING: The BCFS centrifugal wheels run in a coun­terclockwise direction when viewed opposite the air
intake. If the wheel is run in the wrong direction, the
motor will overload and burn out.

WARNING: 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 installed on
temporary wiring, it should be rechecked when per­manently installed. Motor burn-out or tripped overload
protection devices are usually the result of incorrect
rotation.

WARNING: Motor overloading is usually the result of
incorrect rotation, high voltage, or low voltage. The NEC
states that motors used in devices such as filtered roof
supply units must be protected by a separate overload
device that is responsive to motor current or a thermal
protector integral with the motor. Refer to Sections 430­22 of the NEC for additional information.

5. Electrical Input Check: Perform check of fan ampere

draw and verify that motor nameplate amps are not
exceeded. Take account of the service factor range
if motor is nameplated above a 1.0 service factor.

6. Fan RPM Check: Fan RPM should be checked and

verified with a tachometer. Refer to Table 2 for maxi­mum fan RPM values.

WARNING: Running fan at an RPM greater than the

maximum RPM value in Table 2 will overload the fan
motor and lead to premature motor failure.

Table 1. Utilization Voltage Ranges

SYSTEM VOLTAGE/ UTILIZATION VOLTAGE
UNIT NAMEPLATE MIN. MAX.

115/60/1 104 127
208-230/60/1 or 208-230/60/3 187 253
230/60/1 or 230/60/3 207 253
277/60/1 249 305
200/60/3 180 220
380/60/3 342 418
460/60/3 414 506
575/60/3 517 633
110/50/1 99 121
220/50/1 198 242
380-415/50/3 342 456
440/50/3 396 484

Table 2. Maximum Fan RPM

BCFS MAXIMUM
MODEL

1/6 1100
1/4 1250

1/2 1590
3/4 1810

1.0 2000
1/6 730
1/4 840
1/3 930
180 1/2 1060
3/4 1220

1.0 1300

1.5 1530
1/3 580
1/2 660
3/4 760

1.5 960

2.0 1060

3.0 1180

5.0 1350

1/3 1380

140

1.0 840

240

MOTOR HP

FAN RPM

Maintenance

FILTERS: To gain access to filters, unlatch top panel

and slide top back approximately 2 inches. Lift filters out
from top. Filters may be cleaned with soap and water
or replaced. Filters should be cleaned regularly, as dirty
filters will cause performance to be reduced. Frequency
of cleaning depends upon the local environment and
frequency of use of the fan.

1. The motors in these units are equipped with prelu­bricated ball bearings which are considered to be
permanently lubricated.

2. Fan shaft pillow block bearings are equipped with
grease gun fittings. These bearings are factory lubri­cated and, with normal operation, will need no lubri­cation for 3 to 6 months.

3. For pillow block bearings, use a low pressure grease
gun with Alvania #2 or #3 grease or equivalent. Only
a few strokes of the gun are required. Excess grease
will be forced out through the bearing pressure relief
holes. Use of a high pressure gun, however, is liable
to blow the bearing seals.

2 Twin City IM-4300