R134a gas for air conditioning system

The system is fitted with a NIPPONDENSO vane compressor with automatic regulation of compressed gas flow via electronic control unit (95). The unit is fastened under the heater.

The system acts on a fan in the compressor by measuring the temperature of evaporator (G) by means of an N.T.C. temperature sensor (not shown in figure).

System operation is described in detail in the following chapters.

Two connectors (I) fastened on a bracket on the left hand wall of the heater unit are used to connect the unit electrical system to the other air conditioner devices, located in the engine bay, and to the vehicle electrical system.

Two relays are located in the left hand part of the unit: relay (100) is used to supply the fan circuit. Relay (101) activates fan first speed when the air conditioner is turned on using button (99).

R134a gas for air conditioning system

The gas used in this system is R134a (tetrafluoroethane), considered environmentally sound according to EEC law.

R134a gas cannot be used in systems designed for Freon. This is because its different molecular structure makes some components permeable (e.g. seals, hoses etc.). For this reason, components of systems that use the new gas are NOT INTERCHANGEABLE UNDER ANY CIRCUMSTANCES with components designed for Freon.

For this reason, the system must be charged/discharged using only specially-designed equipment (cleaner 134 produced by ICF) as described in the relevant chapter.

The amount of R134a gas required for this system is: 650 ± 25 cc