Mazda CT-L1005, Руководство по обучению

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Basic Climate Control A/C System
Variable Displacement Scroll Compressor
•
The variable displacement scroll compressor functions similar to the standard scroll
compressor described earlier. The only difference is an additional control valve that
enables the compressor to reduce the delivery to as little as 30% of maximum output.
The control valve varies the delivery by passing refrigerant from a chamber between the
two helices back to the low-pressure side.
Fixed Orifice
•
The fixed orifice has a similar function to that of the expansion valve, except that there
are no moving parts. There is no feedback required from the evaporator, so the fixed
orifice can be located a bit further away from the evaporator. On the Tribute the flow rate
of the refrigerant through the fixed orifice is determined by the cycling of the compressor.
On the Mazda2 and Mazda3 Diesel the refrigerant flow through the fixed orifice is
controlled via the delivery of the variable displacement compressor. Both times, the heat
absorbing performance of the evaporator is adapted to the actual demand.
•
The position of the fixed orifice in the refrigerant line can be recognized by the indent in
the line.
NOTE: The diameter of the fixed orifice varies depending on the model. The fixed orifices for
different models can be distinguished by the color of the housing.
L1005_039
1 Inlet: high-pressure 4 O-ring seal
warm refrigerant 5 Outlet: atomised low-pressure
2 Filter screen cold refrigerant
3 Fixed orifice
Curriculum Training 03-25