Twin City IM-4310 User Manual

BCRFS Belt Driven

Centrifugal Filtered Supply Fans

INSTALLATION, OPERATION & MAINTENANCE MANUAL

IM-4310

August 2014

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.

FAN ASSEMBLY

The BCRFS supply fan is shipped with the intake hood stored in the fan housing. Remove housing cover. Remove
Intake Hood parts and assemble with hardware provided. Attach Filter Rails to Hood sides. Insert Filters. Install Hood
Top. Attach Hood to inlet side of fan housing.

MOTOR INSTALLATION

Motor 213T frame and larger are shipped loose to avoid damage. Mount to motor plate with hardware provided.

©2014 Twin City Fan Companies, Ltd.

Installation

Roof ventilators should always be mounted to a flat
level, solid and rigid structure. Particular caution should
be exercised when installing fans on metal buildings. Be
sure roof is capable of supporting the fan(s). Fans
mounted on roofs that are not supported correctly will
cause vibration that could cause damage or injury.

Use guy wires to help secure roof units if excessively
windy conditions prevail.

1. CAUTION! This fan contains rotating parts and
requires electrical service. Appropriate safety precau­tions should be taken during installation, operation
and maintenance.

2. WARNING! Do not install or operate this fan in an
environment or atmosphere where combustible or
flammable materials, gasses or fumes are present
unless it was specifically designed and manufac­tured for use in that environment. Explosion or fire
can result. Explosive, corrosive, high temperature, or
other extreme conditions may require special con­struction, inspection and maintenance. It is neces­sary to observe the fan manufacturer's recommen­dations and limitations concerning the type of mate­rial to be handled by the fan and its application to
special conditions.

3. The roof supply fan is designed to be mounted on
a curb, which should be securely installed prior to
fan installation.

4. CAUTION! All electrical work must be done in
accordance with local and/ or national electrical
codes as applicable. If you are unfamiliar with meth­ods of installing electrical wiring, secure the ser­vices of a qualified electrician.

5. WARNING! This product must be grounded.

6. DANGER! Make sure power is turned off and locked
in the OFF position at the service entrance before
installing, wiring or servicing fan.

7. CAUTION! Before wiring the motor, check the sup­ply voltage against the motor nameplate voltage.
High or low voltage can damage the motor and void
the motor warranty.

8. WARNING! Be sure to keep all wiring clear of rotat­ing or moving parts.

9. WARNING! Before starting the fan, turn the wheel
to assure it rotates freely. If needed, adjust the
wheel/shaft/bearing/motor position as required to
achieve necessary clearances.

10. On belt driven units, assure belts are tensioned and
aligned properly. See Maintenance section, Page 5.

11. Check all setscrews and keys. Tighten as necessary
prior to fan start-up.

12. Anchor the fan securely to the roof curb. Anchoring
through the vertical portion of the curb cap flange
is recommended. Use a minimum of eight lag bolts
or other suitable fasteners.

BACKDRAFT DAMPER INSTALLATION (OPTIONAL ACCESSORY)

Dampers are available only with the Inlet Extension accessory. Dampers are to be positioned in the damper rails
located in the extension near the fan housing, under the Access Door. Make sure the damper blades open towards
the fan.

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Twin City IM-4310

Electrical Connection

1. Connect supply wiring to the disconnect switch (non­fused 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.

Check, Test & Start Procedure

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.

1. Disconnect power to the unit before servicing. Make
sure power is turned off and locked in the OFF
position.

2. Tighten all bolts and setscrews securely and, on belt
driven fans, check sheave alignment and belt tension.
Tighten belts if necessary. NOTE THAT ALL BOLTS,
SETSCREWS AND BELTS SHOULD BE RETIGHTENED
AFTER TWO DAYS OF INITIAL OPERATION.

3. Apply power to unit and check rotation of wheel with
the directional arrow on the unit.

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, its should be
rechecked when permanently installed. Motor burn-out
or tripped overload protection devices are usually the
result of wrong rotation.

4. 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.

5. Fan RPM Check: Fan RPM should be checked and
verified with a tachometer.

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 erection, weak foundations and
alignments.

Twin City IM-4310

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