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TM 5-4120-361-14
NOTE
IN ACCORDANCE WITH ENVIRONMENTAL PRO-
TECTION AGENCY REGULATIONS REFRIGERANTS
CANNOT BE DISCHARGED INTO THE ATMO-
SPHERE. A REFRIGERANT RECOVERY & RECY-
CLING UNIT MUST BE USED WHENEVER DIS-
CHARGING THE REFRIGERANT SYSTEM.
OPERATION OF THE RECOVERY/RECYCLING UNIT
MUST BE BY AUTHORIZED PERSONNEL ONLY
TO DISCHARGE SYSTEM:
REMOVE ACCESS COVER. REMOVE LOW PRESSURE
CHARGING VALVE CAP. ATTACH A SUITABLE
HOSE TO CHARGING VALVE. CONNECT AND
OPERATE A RECOVER/RECYCLING UNIT IN
ACCORDANCE WITH THE MANUFACTURER’S
INSTRUCTIONS.
TO PURGE SYSTEM:
REMOVE HIGH PRESSURE CHARGING VALVE CAP.
CONNECT VALVE TO A CYLINDER OF DRY NITRO-
GEN. ATTACH A SUITABLE DISCHARGE HOSE TO
LOW PRESSURE CHARGING VALVE. OPEN NITRO-
GEN VALVE AND ALLOW NITROGEN TO FLOW
THROUGH SYSTEM UNTIL ALL MOISTURE IS
FORCED OUT. CLOSE NITROGEN CYLINDER
VALVE.
TO EVACUATE SYSTEM:
CONNECT A VACUUM PUMP TO HIGH AND LOW
PRESSURE CHARGING VALVES. START VACUUM
PUMP AND RECORD TIME FOR MAXIMUM VAC-
UUM READING ON GAGE. CONTINUE EVACUAT-
ING FOR EQUAL PERIOD OF TIME. STOP PUMP AND
OBSERVE GAGE. IF VACUUM HOLDS FOR A TIME
EQUAL TO PUMP DOWN TIME, EVACUATION IS
SATISFACTORY. SEE FIGURE 6-2 FOR CHARGING
SYSTEM.
Figure 6-1. Discharging and purging refrigerant system
6-3
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