Carrier PC211 specifications Refrigerant Tracer, To Pressurize with Dry Nitrogen

WARNING ! WARNING

HCFC-22 and HFC-134a should not be mixed with air or oxygen and pressurized for leak testing. In general, neither refrigerant should not be allowed to be present with high concentrations of air or oxygen above atmospheric pressures, as the mixture can undergo combustion.

Refrigerant Tracer

Use an environmentally acceptable refrigerant as a tracer for leak test procedures.

To Pressurize with Dry Nitrogen

Another method of leak testing is to pressurize with nitrogen only and use a soap bubble solution or an ultrasonic leak detector to determine if leaks are present. This should only be done if all refrigerant has been evacuated from the vessel.

1.Connect a copper tube from the pressure regulator on the cylinder to the refrigerant charging valve. Never apply full cylinder pressure to the pressurizing line. Follow the listed sequence.

2.Open the charging valve fully.

3.Slowly open the cylinder regulating valve.

4.Observe the pressure gage on the machine and close the regulating valve when the pressure reaches test level. Do not exceed 140 psig (965 kPa).