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g. After successfully completing the test for large leaks, remove as much nitrogen, air, and
moisture as possible, given the fact that small leaks may be present in the system. This
can be accomplished by following the dehydration procedure, outlined in the Machine
Dehydration section.
h. Slowly raise the system pressure to a maximum of 210 psig (1448 kPa) but no less than
68 psig (469 kPa) for HCFC-22, 35 psig (241 kPa) for HFC-134a by adding refrigerant.
Proceed with the test for small leaks (Steps 3-9).
3. Check the machine carefully with an electronic leak detector, halide torch, or soap bubble
solution.
4. Leak Determination — If an electronic leak detector indicates a leak, use a soap bubble
solution, if possible, to confirm. Total all leak rates for the entire machine. Leakage at rates
greater than 1 lb/year (0.45 kg/year) for the entire machine must be repaired. Note total
machine leak rate on the start-up report.
5. If no leak is found during initial start-up procedures, complete the transfer of refrigerant gas
from the storage tank to the machine (see Pumpout and Refrigerant Transfer Procedures,
Machines with Storage Tanks section, Step 1e). Retest.
6. If no leak is found after a retest:
a. Transfer the refrigerant to the storage tank and perform a standing vacuum test as out-
lined in the Standing Vacuum Test section.