GF83.50-D-2020H Rear Air Conditioning System Refrigeration Circuit, Function
GF83.50-D-2020H Rear Air Conditioning System Refrigeration Circuit, Function
- with CODE (HH7) Additional air conditioning in rear
17 Front evaporator
25 Front expansion valve
31 Front desiccant cartridge
32 Front condenser
37 Rear evaporator
A High pressure (gaseous)
B High pressure (liquid)
C Low pressure (liquid)
D Low pressure (gaseous)
A9 Refrigerant compressor
A32/2y1 Refrigerant shutoff valve
The refrigerant compressor driven by the engine compresses the gaseous refrigerant that is drawn in by the low pressure (D), causing it to heat up. Then the gaseous refrigerant is routed into the front condenser by the high pressure (A), where the compression heat is removed over the surface of the front condenser, thus cooling down the refrigerant. As it is cooling down, the refrigerant liquefies (condenses). Then the liquid refrigerant is routed to the front desiccant cartridge by the high pressure (liquid) (B). Any contamination or water content in the liquid refrigerant is removed in the front desiccant cartridge. After cleaning in the front desiccant cartridge, the liquid refrigerant is routed by the high pressure (liquid) to the front expansion valve and to the refrigerant shutoff valve with the integrated rear expansion valve. The front expansion valve regulates the flow of refrigerant to the front evaporator depending on the low pressure (gaseous) and the temperature at the front evaporator outlet.
The refrigerant shutoff valve with the integrated rear expansion valve closes or opens and regulates the flow of refrigerant to the rear evaporator depending on the low pressure (gaseous) and the temperature at the rear evaporator outlet.
The refrigerant, which is part liquid and part gaseous, is routed into the front evaporator from the front expansion valve by the low pressure (liquid). The partly liquid and partly gaseous refrigerant is routed from the refrigerant shutoff valve with the integrated rear expansion valve by the low pressure (liquid) into the rear evaporator.
The refrigerant evaporates in the front evaporator and the rear evaporator. This evaporation process causes heat and humidity to be removed from the fresh air or recirculated air that is flowing through the pipe and honeycomb system of the front evaporator and the rear evaporator from the outside, causing it to be cooled down and dried. The air humidity carried along is converted to condensed water, which is routed to the outside.
The refrigerant compressor draws in the refrigerant which has become gaseous again due to heat absorption, via the low pressure (gaseous) and compresses it again.
The refrigerant shutoff valve with the integrated rear expansion valve is closed, if the rear automatic air conditioning is switched off using the rear air conditioning button (S98s7) integrated into the KLA control and operating unit (S98) is switched off or if the refrigerant compressor is switched off using the AC OFF and residual heat system button (S98s4) integrated into the KLA control and operating unit.
