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ARMY TM 9-4120-381-14
NAVY EE-000- CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
4-12. PULLEY CHECKS. Two sets of color-coded pulleys are provided with the unit. Green pulleys are for 60 Hz
operation. Red pulleys are for 50 Hz operation. One set of pulleys (either the 50 Hz or 60 Hz) is installed on each of the
two fans and fan motors within the unit. The other set is bolted to the side panel inside the unit. See Figure 4-12 for
pulley locations.
CAUTION
Do not operate unit on 60 Hz power with 50 Hz pulleys installed. Fans will over-
speed resulting in fan motor overload.
a.
Determine operating frequency of unit.
NOTE
Measure the diameters of the pulleys to ensure that dimensions are as follows:
50 Hz (red)
60 Hz (green)
Pulley
Dia (inches)
Dia (inches)
Condenser fan
6-1/2
6-3/4
Condenser motor
5-1/4
4-1/2
Evaporator fan
4-3/4
4-7/8
Evaporator motor
4-3/4
4-7/8
b.
Check that correct pulleys are installed on fans and fan motors.
c.
If correct pulleys are installed, go to paragraph 4-14. If pulleys must be exchanged, go to paragraph 4-72
and
4-78 (60 Hz pulley), or 4-73 and 4-79 (50 Hz pulley).
Figure 4-12. Pulley Locations
4-8
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