Twin City BCFS Centrifugal Filtered Supply Fans - IM-4300 - Manual (Page 2)

2 Twin City IM-4300
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 prelu-
bricated 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 lubri-
cated and, with normal operation, will need no lubri-
cation 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.
Maintenance
BCFS MAXIMUM
MODEL
MOTOR HP
FAN RPM
1/6 1100
1/4 1250
140
1/3 1380
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
240
1.0 840
1.5 960
2.0 1060
3.0 1180
5.0 1350
Table 2. Maximum Fan RPM
Check, Test and Start Procedure
WARNING
Electric shock hazard. Could cause severe injury
or death. Failure to bond the frame of this equip-
ment 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 discon-
nect 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 coun-
terclockwise 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 per-
manently 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 430-
22 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 maxi-
mum 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