FORM 160.73-O2 (605)
29
YORK INTERNATIONAL
HANDLING REFRIGERANT FOR
DISMANTLING AND REPAIRS
MEGGING THE MOTOR
If it becomes necessary to open any part of the re frig er ant
system for repairs, it will be necessary to re move the charge
before opening any part of the unit. If the chiller is equipped
with optional valves, the refrigerant can be iso lat ed in either
the condenser or evaporator / compressor while making
any necessary repairs.
While the main disconnect switch and compressor mo tor
starter are open, meg the motor as follows:
1. Using a megohm meter (megger), meg between
phas es and each phase to ground (See Fig. 13); these
read ings are to be interpreted using the graph shown
in Fig. 14.
2. If readings fall below shaded area, remove ex ter nal
leads from motor and repeat test.
Motor is to be megged with the
starter at ambient temperature after
24 hours of idle stand by.
FIG. 13 –
DIAGRAM, MEGGING MOTOR WIND INGS
LD00475
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