Twin City HA / HAB Fiberglass Wall Mount Ventilators - IM-3100 - Manual (Page 2)

2 Twin City Fan & Blower IM-3100
Maintenance
General
Fan shaft bearings on belt drive units are factory lubri-
cated 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.
Motors require no lubrication for 10 years of normal
operation.
The inlet venturi is molded shock-resistant, bonded,
reinforced fiberglass and will require no maintenance.
Wall Application
1. Servicing or inspecting the unit can be accomplished
from the exterior by removing the flanged extruded
louver and from the interior of the building by remov-
ing the fiberglass inlet (see Figure 2).
2. To remove the motor assembly for servicing, unplug
the motor from the provided outlet and unfasten the
four vibro-isolator bolts. The entire motor assembly,
including the wheel and bearing (belt drive units), will
slide out of the housing.
Inline Application
For easy maintenance of the inlet unit, provide a drop-
out section between the ductwork and duct adapter (see
Figure 3).
Servicing or inspection can then be accomplished by
removing the dropout section, then removing the fiber-
glass inlet. The motor assembly can then be removed
by disconnecting the motor from the provided outlet and
unfastening the four vibro-isolator bolts. Periodic inspec-
tion and cleaning of the fan will insure smooth operation.
Figure 1. Removal of Wood Shipping Supports
Housing
Instructions: Remove wood shipping supports
frame before installing unit .
3. On three-phase units check and calculate phase unbal-
ance 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.
WARNING: Especially check three-phase units for rota-
tion. For three-phase, rotation can be changed by
interchanging any two of the three line leads. If unit is
check 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.
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 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 2. Maximum Fan RPM (Belt Drive Units)
MAXIMUM
MODEL MOTOR HP
FAN RPM
12HA1B, 2B, 3B 1/4 1740
14HA1B, 2B, 3B 1/4 1470
14HA4B 1/3 1615
14HA5B 1/2 1850
18HA1B, 2B 1/4 945
18HA3B 1/3 1040
18HA4B 1/2 1200
18HA5B 3/4 1365
24HA1B 1/4 575
24HA2B 1/3 633
24HA3B 1/2 725
24HA4B 3/4 830
24HA5B 1 915
30HA1B 1/3 440
30HA2B 1/2 500
30HA3B 3/4 575
30HA4B 1 630
30HA5B 1 1 ⁄
2
725
30HA6B 2 795
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.