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prevent possible piping stress and damage during the transfer of refrigerant from vessel to
vessel during the leak test process, or any time refrigerant is transferred. Adjust the springs
when the refrigerant is in operating condition, and when the water circuits are full.
Refrigerant Tracer
Carrier recommends the use of an environmentally acceptable refrigerant tracer for leak
testing with an electronic detector or halide torch.
Ultrasonic leak detectors also can be used if the machine is under pressure.
Leak Test Machine
Due to regulations regarding refrigerant emissions and the difficulties associated with
separating contaminants from refrigerant, Carrier recommends the following leak test
procedures. See Figure 28 for an outline of the leak test procedures. Refer to Table 5A and
Table 5B for refrigerant pressure/temperature values and to Pumpout and Refrigerant Transfer
Procedures section.
Do not use air or oxygen as a means of pressurizing the machine. Some mixtures
of HFC-134a and air can undergo combustion.
WARNING
!
WARNING