Carrier 19XL User Manual

Page 130

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

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

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

section.