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 connecti ng 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).
c. Plainly mark any leaks wh ich are found.
d. Release the pressure in the system.
e. Repair all leaks.
f. Retest the joints that we re repaired.
Never charge liquid refrigerant into the machine if the pressure in the machine is
less than 68 psig (469 kPa) f o r HCFC-22 and 35 psig (241 kPa ) for HFC-134a.
Charge as a gas only, wit h th e cooler and condenser pu mp s running, until this
pressure is reached , u si ng PUMPDOWN LOCKOUT an d TERMINATE LOCKOUT
mode on the PIC. Flashing of liquid refrigerant at low pressures can cause tube
freezeup and considerable damage.
WARNING !WARNING