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TM 5-4120-270-15
Figure 6-13 (1). Pressure testing and evacuating
refrigerant system
STEP 2.
CONNECT HOSE FROM REFRIGERANT
CHARGING
HOOKUP
LOOSELY
TO
SUCTION LINE SERVICE VALVE. OPEN
REFRIGERANT DRUM SHUTOFF VALVE
SLIGHTLY TO PURGE HOSE. TIGHTEN
CONNECTJON
AT
SERVICE
VALVE.
OPEN
DRUM
SHUTOFF
VALVE
AND
OPEN SUCTION LINE SERVICE VALVE.
NOTE:
REFRIGERANT
DRUM
MUST
BE
IN
UPRIGHT POSITION TO ALLOW ONLY
GASEOUS
REFRIGERANT
TO
ENTER
SYSTEM.
STEP 3.
CLOSE THE DRUM SHUTOFF VALVE
WHEN THE DISCHARGE LINE PRESSURE
GAGE
REACHES
10
PSIG.
CLOSE
SUCTION LINE SERVICE VALVE AND
DISCONNECT CHARGING HOSE FROM
VALVE.
STEP 4.
CONNECT
HOSE
FROM
PRESSURE
TESTING
HOOKUP
LOOSELY
TO
SUCTION LINE SERVICE VALVE. OPEN
NITROGEN
DRUM
SHUTOFF
VALVE
SLIGHTLY TO PURGE HOSE. TIGHTEN
CONNECTION
AT
SUCTION
LINE
SERVICE
VALVE.
OPEN
SHUTOFF
VALVE AND SUCTION LINE SERVICE
VALVE. BUILD UP SYSTEM PRESSURE
UNTIL
DISCHARGE
LINE
PRESSURE
REACHES 150 PSIG. CLOSE SUCTION
LINE SERVICE VALVE AND SHUTOFF
VALVE. DISCONNECT CHARGING HOSE
FROM SUCTION LINE SERVICE VALVE.
CLOSE
DISCHARGE
LINE
SERVICE
VALVE AND REMOVE GAGE.
STEP 5.
TEST
FOR
LEAKS
(PAR.
6-15).
DISCHARGE THE REFRIGERANT SYSTEM
(PAR. 6-16).
ME 4120-270- 15/6-13()
Figure 6-13 (2).—Continued..
6-17
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