Self-Study Programme 208 Air Conditioner in the Motor ... - Volkspage

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The temperature can be set differetly for the leftandright-hand sides to between 18 o C and29 o C.The temperature flaps for left/right temperaturedistribution are located in the air distributorhousingActuatorsControl unit J255 orair conditioner operating anddisplay unit E87Air flow flap positioning motorand fresh air/air recirculation flapV71with potentiometer G113Defrost flap positioning motorV107with potentiometer G135Left temperature flappositioning motor V158with potentiometer G220Right temperature flap positioningmotor V159with potentiometer G221Central flap and footwell flappositioning motor V70with potentiometer G112Fresh air blower V2 andfresh air blower control unit J126Magnetic clutch N25Diagnostic connectionAuxiliary signals194_07259
[Temperature controlAir recirculation modeWhat do we mean by air recirculation mode?The air conditioner processes two types of air,namely ambient air and cabin air (airrecirculation).In air recirculation mode, the air used for coolingthe passenger compartment is not extracted fromthe outer atmosphere, rather from the vehicleinterior.Therefore, the system only recirculates andcontrols the temperature of the air which isavailable inside the vehicle.Why air recirculation mode?T C[3020100-100Air recirculation modeFresh air mode2 4 6 8 10 12 14 16t [ min ]208_089Air recirculation mode is the quickest way to cooldown the vehicle interior. This is done byrecycling the cabin air, which is always cooler.When heating the vehicle interior, the converseeffect occurs, i.e. the air is heated more rapidly.An advantage of air recirculation is that theevaporator output or compressor drive outputrequired is more than halved in air recirculationmode.In addition to rapid cooling/heating, airrecirculation mode can be used to avoidbreathing in polluted ambient air (unpleasantodours, pollen).Average values for vehicle temperature reduction/increase in the air recirculation and fresh air modesFresh air flapVacuum boxDoes air recirculation mode have any drawbacks?In air recirculation mode, there is no airexchange. The air will be “used up“.Therefore, air recirculation mode should not beused any longer than is necessary, and for nomore than 15 minutes.In air recirculation mode, the atmospherichumidity in the passenger cabin rises due tomoisture released with the air respired by theoccupants. When the dew point of the interior airexceeds the temperature of the windows, thewindows will inevitably mist up.Cabin airAir recirculation flap208_117In the Defrost setting, therefore, airrecirculation mode is automaticallydisabled.Vehicle air conditioningin air recirculation mode – pneumatically operated60
Page 1 and 2: System controlAt high (increasing)
Page 4 and 5: Radiator fan control unit J293The r
Page 6 and 7: Automatic controlFresh air intake d
Page 8 and 9: Actuators(for system control andtem
Page 10 and 11: Actuators/sensors on a heater/air c
Page 12 and 13: Dash panel temperature sensor G56 w
Page 14 and 15: Auxiliary signals for temperature c
Page 16 and 17: Air ductingDash paneloutletFresh ai
Page 18 and 19: Fresh air208_111Air ducting in the
Page 20 and 21: Air distribution -split into two se
Page 24 and 25: Manual air recirculation modeWith t
Page 26 and 27: Air quality sensor G238The sensor o
Page 28 and 29: Neither welding or brazing or solde
Page 30 and 31: An all-in-one system for checking,
Page 32 and 33: Refrigerants and plasticsRefrigeran
Page 34 and 35: Fault diagnosis through self-diagno
Page 36: Water vapour content of the airSatu

Self-Study Programme 208 Air Conditioner in the Motor ... - Volkspage

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