YORK INTERNATIONAL
28
FORM 160.54-O2(1102)
FORM 160.54-O2(1102)
29
YORK INTERNATIONAL
HANDLING REFRIGERANT FOR
DISMANTLING AND REPAIRS
MEGGING THE MOTOR
If it becomes necessary to open any part of the refrig-
erant system for repairs, it will be necessary to remove
the charge before opening any part of the unit. If the
chiller is equipped with optional valves, the refrigerant
can be isolated in either the condenser or evaporator /
compressor while making any necessary repairs.
While the main disconnect switch and compressor
motor starter are open, meg the motor as follows:
1. Using a megohm meter (megger), meg between
phases and each phase to ground (See Fig. 13);
these readings are to be interpreted using the graph
shown in Fig. 14.
2. If readings fall below shaded area, remove ex-
ternal leads from motor and repeat test.
Motor is to be megged with the
starter at ambient temperature after
24 hours of idle standby.
FIG. 13 – DIAGRAM, MEGGING MOTOR WINDINGS
LD00475
6
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