Pressure-Temperature Relationship of R-134A

Evaporator Range: From -7 to 70 °C (19.4 to 44.6 °F), the temperatures represent the gas temperatures inside the coil and not on the coil surfaces. Add 2 to 6°C (4 to 11 °F) to the coil and air-off temperatures.

Condenser Range: From 45 to 70 °C (113 ° to 158 °F), the temperatures are not ambient. Add 19 to 22 °C (34 to 40 °F) to the ambient temperatures for proper heat transfer. Refer to the pressure chart.

Example:
32 °C (90 °F) Ambient temperature
+ 22 °C (40 °F)
54 °C (130 °F) Condenser temperature, which yields 1379 kPa (200 psig), based on 50 kph (31 mph) airflow.