Dacia SuperNova (engine E7J). Service manual - part 104
AIR CONDITIONING
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PRESSURE CONTROLLER
(low pressure, high pressure, medium pressure, in accordance
with the specification) or pressure capture
- low pressure – disconnect when the pressure in the low pressure circuit is lower than
1,96 +/-0,2 bar , reestablishing at a higher pressure than 2,16 +/- 0,2 bar;
- higher pressure – disconnect when the pressure in the high pressure circuit is higher than
31,4 +/-2 bar , reestablishing at a higher pressure than 25,5 +/-2 bar;
- medium pressure - starts the blower on the second level speed, when the pressure is
higher than 17,7+/-1bar and stops the blower at a lower pressure 13,7+/- 1,2.
Thermostatic expansion valve allows the reduction of the refrigerant liquid pressure which is
coming from the condenser, passing through the tank filter and is continuously adjusting the
refrigerant flow from the evaporator, to reach the compressor in vapor condition.
PRESSURE CONTROLLER
The good operation of the air conditioning unit is ensured by a dryer filter tank that has the
purpose to protect the unit. The filter’s purpose is to absorb the eventually solid particles found
in the oil and refrigerant liquid circulation.
The interception is needed as they might block the operation of the thermostatic expansion
valve or may produce the compressor mobile parts worn or gripping.
DETECTION OF REFRIGERANT FLUID LEAKAGE
In order to detect the refrigerant liquid leakage, it is used a detector, calibrated to detect
leakage of 9gr. /year.