Vehicle air conditioning systems are used to cool down the vehicle interior. They usually work on the basis of the recirculating air principle and aspirate the air to be cooled from the interior. The cold air generated in the air conditioning system is transported by a fan into the vehicle interior.
The refrigeration circuit to generate the cold air in the trainer ET 450 includes a compressor, a condenser with fan and an evaporator as air cooler with three-stage fan and expansion valve. All system components are typical elements used in vehicle technology. The air cooler with three-stage fan is e.g. equipped with typical air vents for the vehicle interior. This achieves a close proximity to practice.
The trainer operates with the 12VDC supply common in vehicles. Even the ignition lock function has been implemented to switch on the system. An electric motor drives the compressor via a V-belt and a magnetic coupling. The speed of the motor and thus the compressor is variably adjustable by a frequency converter to simulate the drive via the vehicle engine. A swash plate in the compressor controls the displacement as the speed increases.
Important characteristic variables, such as pressure, temperature, flow rate and the power consumption of the compressor are displayed. As a particularity eight connectable faults have been installed. The system is particularly suited for the training of motor mechanics.