2
Twin City Installation and Maintenance Manual IM-3100
Check, Test & Start Procedure
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
Given example: With voltage 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.
Table 1. Utilization Voltages
SYSTEM VOLTAGE/
UNIT NAMEPLATE
UTILIZATION VOLTAGE
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
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.
WARNING
5.
Electrical Input Check: Perform check of fan ampere
draw and verify that motor nameplate amps are not
exceeded. Take account of the service factory 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.
Table 2. Maximum Fan RPM (Belt Driven Units)
MODEL
HAB
MOTOR
HP
MAXIMUM
FAN RPM
12HA1B, 2B, 3B
1/4
1738
14HA1B, 2B, 3B
1/4
1468
14HA4B
1/3
1615
14HA5B
1/2
1849
18HA1B, 2B
1/4
945
18HA3B
1/3
1040
18HA4B
1/2
1191
18HA5B
3/4
1363
24HA1B
1/4
575
24HA2B
1/3
633
24HA3B
1/2
725
24HA4B
3/4
830
24HA5B
1
913
30HA1B
1/3
436
30HA2B
1/2
500
30HA3B
3/4
572
30HA4B
1
630
30HA5B
1
1
/
2
721
30HA5B
2
793
Maintenance
General
Fan shaft bearings on belt drive units are factory
lubricated and require no lubrication for the first 3-6
months of operation. Lubricate at intervals shown in
Table 3 thereafter. With fan running and with a low
pressure grease gun, add grease slowly until a slight
bead forms between the seals. Use Sinclair Litholene,
Shell Gadus S2 V100 2, Socony Vacuum Armvac 781,
Sinclair Oil Stranolith 57 or equal.
Belts on belt-drive units should be readjusted after 24
hours of operation. Loosen motor base bolts and apply
15 lbs. pull per belt for proper belt tensions. Tighten
motor base bolts.
Check contact surfaces of belt for excessive wear. If
belts have a slick, glazed look or are cracked, belts are
slipping. Replace belts as required.
OPERATING CONDITION
GREASING INTERVAL
FAIRLY CLEAN
6 to 12 Months
MODERATE TO
EXTREMELY DIRTY
1 Month
Table 3. Bearing Lubrication Interval
(Belt Drive Model HAB Only)
1.
Frequency or regreasing will vary, depending on the hours of
operation, temperature and surrounding conditions.
2.
Bearings have been prelubricated from factory with NLGI Grade
No. 2 lithium-12 hydroxysterate base grease.
Especially check three-phase units for rotation.
For three-phase, rotation can be changed by
interchanging any two of the three line leads. If the
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.
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.
WARNING
