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1. If the pressure readings are normal for machine condition:
a. Evacuate the nitrogen holding charge from the vessels, if present.
b. Raise the machine pressure, if necessary, by adding refrigerant until pressure is at
equivalent saturated pressure for the surrounding temperature. Follow the pumpout
procedures in the Pumpout and Refrigerant Transfer Procedures section.
c. Leak test machine as outlined in Steps 3 -9.
2. If the pressure readings are abnormal for machine condition:
a. Prepare to leak test machines shipped with refrigerant (Step 2h).
b. Check for large leaks by connecting a nitrogen bottle and raising the pressure to 30 psig
(207 kPa). Soap test all joints. If the test pressure holds for 30 minutes, prepare the test
for small leaks (Steps 2g - h).
Never charge liquid refrigerant into the machine if the pressure in the machine is
less than 35 psig (241 kPa). Charge as a gas only, with the cooler and condenser
pumps running, until this pressure is reached, using PUMPDOWN LOCKOUT and
TERMINATE LOCKOUT mode on the PIC. Flashing of liquid refrigerant at low
pressures can cause tube freezeup and considerable damage.
WARNING
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WARNING