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STEP 6.
STEP 7 .
STEP 8.
STEP 9.
STEP 10.
STEP 11.
NOTE:
NOTE:
CONNECT HOSE FROM PRESSURE TESTING HOOKUP LOOSELY
TO SUCTION SERVICE VALVE OPEN/NITROGEN DRUM SHUT-
OFF VALVE SLIGHTLY TO PURGE HOSE.
TIGHTEN CON-
NECTION AT SUCTION SERVICE VALVE.
OPEN SHUTOFF
VALVE.
BUILD UP SYSTEM PRESSURE UNTIL THE DIS-
CHARGE PRESSURE REACHES 150 PSIG.
CLOSE SHUTOFF
VALVE.
DISCONNECT HOSE FROM SUCTION SERVICE
VALVE AND DISCHARGE SERVICE VALVE.
LEAK TEST IN ACCORDANCE WITH PARAGRAPH 6.5.a.
ATTACH A SUITABLE VACUUM PUMP TO SUCTION SERVICE
VALVE AND A MANOMETER TO THE DISCHARGE SERVICE
VALVE.
OPERATE THE VACUUM PUMP UNTIL THE MANO-
M E T E R I N D I C A T E S 2 . 5 M M H G . A B S . ( M i l l i m e t e r s OF
MERCURY, ABSOLUTE).
STOP THE PUMP.
ATTACH HOSE FROM REFRIGERANT
DRUM, PURGE AIR FROM LINE WITH REFRIGERANT AND
SLOWLY BREAK THE VACUUM THROUGH THE SUCTION
SERVICE VALVE UNTIL 760 M M HG ABS IS READ O N
MANOMETER.
REMOVE LINE FROM SUCTION SERVICE
VALVE.
REMOVE REFRIGERANT DRUM AND CONNECT VACUUM PUMP
TO SUCTION SERVICE VALVE.
PURGE AIR’ FROM HOSE
AND START PUMP.
OPERATE PUMP UNTIL MANOMETER
AGAIN REACHES 2.5 MM HG ABS.
REMOVE LINE FROM SUCTION SERVICE VALVE AND ALLOW
UNIT TO STAND UNDER VACUUM FOR APPROXIMATELY
12 HOURS.
IF NO NOTICABLE RISE IN PRESSURE OC-
CURS, THE SYSTEM IS READY FOR CHARGING.
REMOVE
VACUUM PUMP AND MANOMETER.
INSTALL CAPS.
RISE IN PRESSURE WILL BE INFLUENCED BY AMBlENT
TEMPERATURE.
MAKE SURE VACUUM IN SYSTEM IS
COMPLETELY RELIEVED BEFORE CHARGING.
WHEN UNIT IS OPERATING DO NOT OPEN BOTH MANl-
FOLD VALVES AT THE SAME TIME.
o
ME 4120 - 308 - 15/6 - 4 3
Figure 6-4—Con tinued.
6-8
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