50
YORK INTERNATIONAL
CHECKING THE REFRIGERANT CHARGE
DURING UNIT SHUTDOWN
The refrigerant charge is specified for each CodePak
model (see Table 4). Charge the correct amount of re-
frigerant and record the level in the cooler sight glass.
The refrigerant charge should always be checked and
trimmed when the system is shut down.
The refrigerant charge level must be checked after the
pressure and temperature have equalized between the
condenser and cooler. This would be expected to be 4
hours or more after the compressor and water pumps
are stopped. The level should be at the center of the
sight glass + 1/4 inch (6.35 mm).
Charge the refrigerant in accordance with the method
shown under the “Refrigerant Charging”, on page 49.
The refrigerant level should be observed and the level
recorded after initial charging.
HANDLING REFRIGERANT FOR
DISMANTLING AND REPAIRS
If it becomes necessary to open any part of the refrigerant system for repairs, it
will be necessary to remove the charge before opening any part of the unit.
MEGGING THE MOTOR
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.
LD01085
FIG. 23 – DIAGRAM, MEGGING MOTOR WINDINGS
