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TO DISCHARGE SYSTEM:
REMOVE LOW PRESSURE CHARGING VALVE CAP.
ATTACH A SUITABLE HOSE TO CHARGING VALVE AND
DISCHARGE REFRIGERANT INTO A SAFE AREA.
NOTE: TO PREVENT EXCESS LOSS OF OIL, DISCHARGE
SYSTEM SLOWLY OVER A PERIOD OF TWO HOURS.
TO PURGE SYSTEM:
REMOVE HIGH PRESSURE CHARGING VALVE CAP.
CONNECT VALVE TO A CYLINDER OF DRY NITROGEN.
ATTACH A SUITABLE DISCHARGE HOSE TO LOW PRES-
SURE CHARGING VALVE. OPEN NITROGEN VALVE
AND ALLOW NITROGEN TO FLOW THROUGH SYSTEM
UNTIL ALL MOISTURE IS FORCED OUT. CLOSE NITRO-
GEN CYLINDER VALVE.
CONNECT A VACUUM PUMP TO HIGH AND LOW PRES-
SURE CHARGING VALVES. HOLD A 29.0” Hg VACUUM
FOR 8 HOURS.
ME 4120-243-14/6-1
Figure 6-1. Discharging and evacuating refrigerant system.
6 - 3
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