1. If the pressure readin gs are normal for machi ne c on dition:
a. Evacuate the nitroge n hol ding charge from the ve s s els , if present.
b. Raise the machine pres s ur e, if necessary, by addin g r ef rigerant until pressur e is at
equivalent saturat ed pressure for the surround ing temperature. Foll ow the pumpout
procedures in the Pumpout and Refri gerant Transfer Proc edu res section.
c. Leak test machine as outl ined in Steps 3 -9.
2. If the pressure readin gs are abnormal for machin e condition:
a. Prepare to leak test mac hin es shipped with refrige rant (Step 2h).
b. Check for large l eaks by connec ting a nitrogen bottle and raisin g the pressure to 30 psig
(207 kPa). Soap test all joi nts. If the test pressure holds for 30 minutes, prep are 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 tu be freezeup and conside rable damage.
WARNING !WARNING