York Millennium YK M3 M3 G4 THRU YK S6 S4 J2 - Manual (Page 53)

YORK INTERNATIONAL 53
FORM 160.49-O2
HANDLING REFRIGERANT FOR
DISMANTLING AND REPAIRS
MEGGING THE MOTOR
If it becomes necessary to open any part of the refriger-
ant system for repairs, it will be necessary to remove the
charge before opening any part of the unit.
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. 23);
these readings are to be interpreted using the graph
shown in Fig. 24.
2. If readings fall below shaded area, remove external
leads from motor and repeat test.
NOTE: Motor is to be megged with the starter at
ambient temperature after 24 hours of idle
standby.
FIG. 23 – DIAGRAM, MEGGING MOTOR WINDINGS
LD00475