When a refrigerant system charged with R-22 has a suction pressure of 85 psig, what is the line temperature?

To determine the line temperature of a refrigerant system charged with R-22 when the suction pressure is 85 psig, it is important to refer to the pressure-temperature relationship of the refrigerant. For R-22, the saturation temperature corresponding to a suction pressure of 85 psig can be found using a refrigerant pressure-temperature chart.

At 85 psig, the saturation temperature for R-22 is approximately 64°F. This temperature represents the temperature of the refrigerant in the evaporator coil, where it transitions from liquid to vapor. Therefore, the line temperature of the suction line, which carries vapor back to the compressor, will be close to the saturation temperature under ideal conditions, and in this case, it matches the identified temperature of 64°F.

Understanding this relationship is crucial for HVAC technicians, as it allows them to diagnose system performance and ensure proper operation. Recognizing the saturation temperature in relation to system pressures is a fundamental skill in HVAC service.