Performance Characteristics For Retrofitted A/C Systems

General performance characteristics for R-12 A/C systems and the retrofit R-134a systems differ. These differences are outlined below:

Recirculating-to-discharge Air Temperature

^ The retrofitted stem retains the original R-12 heat exchanger (evaporator and condenser)

^ Some R-12 lubricant oil remains in the A/C system

^ Because of these two reasons, the retrofit A/C system has a slightly lower cooling capacity than the R12 A/C system. The maximum discharge temperature is increased by approximately 3.6 deg. F (2 deg. C).

Ambient Air Temperature-to-Operating Pressure

The retrofit A/C system has a higher operating pressure than the R-12 A/C system when the outside temperature exceeds 59 deg. F (15 deg. C).

^ High pressure side (discharge side): Maximum pressure increase of approximately 43 PSI (3 kg/cm, 294 kPa.)

^ Low pressure side (suction side): Same as R-12 A/C system.

Refer to the appropriate service manual for discharge air temperatures and operating pressure values for individual models. After verifying the discharge air temperature is within specifications, the retrofit is complete.