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TM 5-4120-270-15
STEP 6.
REMOVE CAP FROM DISCHARGE SERVICE
VALVE. ATTACH A SUITABLE VACUUM PUMP
TO SUCTION LINE SERVICE VALVE. AND A
MANOMETER
TO
THE
DISCHARGE
LINE
SERVICE
VALVE.
OPEN
THE
SERVICE
VALVES AND OPERATE THE VACUUM PUMP
UNTIL THE MANOMETER INDICATES 2.6 MM
HG.ABS.
(MILLIMETERS
OF
MERCURY,
ABSOLUTE),
STEP 7
CLOSE THE SUCTION LINE SERVICE VALVE
AND STOP THE PUMP. ATTACH HOSE FROM
REFRIGERANT DRUM, PURGE AIR FROM
LINE WITH REFRIGERANT AND SLOWLY
BREAK THE VACUUM BY OPENING THE
SUCTION
LINF
SERVICE
VALVE
UNTIL
MANOMETER INDICATES 760 MM HG. ABS.
CLOSE SUCTION SERVICE VALVE. NOTE.
RISE IN PRESSURE WILL BE INFLUENCED BY
AMBIENT
TEMPERATURE.
MAKE
SURE
VACUUM
IN
SYSTEM
IS
COMPLETELY
RELIEVED BEFORE REEVACUATING.
STEP 8.
REMOVE
REFRIGERANT
DRUM
AND
CONNECT VACUUM PUMP TO SUCTION LINE
SERVICE VALVE. PURGE AIR FROM HOSE,
START PUMP AND OPEN SUCTION LINE
SERVICE VALVE OPERA1E PLUMP UNTIL
MANOMEIER AGAIN READS 2 5 MM HG.ABS.
STEP 9.
CLOSE SUCTION LINE SERVICE VALVE AND
ALLOW UNIT TO STAND UNDER VACUUM
FOR APPROXIMATELY 12 HOURS. IF NO
NOTICEABLE RISE IN PRESSURE OCCURS,
THE SYSTEM IS READY FOR CHARGING.
CLOSE
SERVICE
VALVES
AND
REMOVE
VACUUM PUMP AND MANOMETER INSTALL
SERVICE VALVE CAPS.
ME 4120-270-15/613(3)
Figure 6-14 (1). Charging refrigerant system.
Figure 6-13 (3) -Continued.
6-18
TM 5-4120-270-15
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