Twin City BCRFS Belt Driven Centrifugal Filtered Supply Fans - IM-4310 - Manual (Page 3)

Twin City IM-4310 3
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 stan-
dard in the unit terminal box. Size grounding conduc-
tor 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 improp-
er line voltage or with excessive phase unbalance con-
stitutes product abuse and may cause severe damage
to the unit’s electrical components.
Check, Test & Start Procedure
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 bal-
anced 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 erection, weak foundations and
alignments.