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 fo llowing the dehydratio n procedure, outline d 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-1 34a by adding refriger an t.
Proceed with the test for small leaks (Steps 3-9).
3. Check the machine care fully with an electronic le ak detector, halide torc h , or soap bubble
solution.
4. Leak Determinatio n — If an ele ctronic leak detector in dicates a leak, use a soa p bub ble
solution, if possible, to confirm. Total all leak r at es for the entire machine . Leakage at rates
greater than 1 lb/year ( 0. 45 kg/year) for the enti r e m ac hi ne must be repaired. Not e total
machine leak rate on the start-up report.
5. If no leak is fou nd during initi al start-up procedu res, complete th e transfer of refri gerant gas
from the storage tank to t he m ac h ine (see Pumpout and Refrigerant Transfer Procedures,
Machines with Storage Tanks section, Step 1e). Retest.
6. If no leak is found after a re te st:
a. Transfer the refrige r ant to the storage tank and perf orm a standing vacuum t es t as out-
lined in the Standing Vacuum Test section.