Volkswagen Passat W8, Руководство по обслуживанию, Страница: 48 / 52

48
When the CLIMAtronic is ON and the driver
enters the desired temperature, the refrigerant
demand is determined and changed by a
number of different influences.
The evaporator control circuit
The compressor regulating valve N280
The external regulating valve forms an interface
between the suction and high pressure sides of
the compressor. It balances out the pressures
applied.
For example, if the cooling output is increased,
the regulating valve is controlled by the
CLIMAtronic control unit J255.
When the control voltage is applied to the
electromagnet control valve, a plunger in the
control valve moves. The period of the control
voltage applied determines the amount of travel.
The adjustment changes the cross-section of the
opening between the suction and the high
pressure sides in the valve. High pressure rises as
the suction pressure drops. This causes the piston
stroke to reposition the swash plate at a greater
angle.
The components described below form a control
circuit for regulating the desired temperature.
Compressor regulating
valve N280
CLIMAtronic control unit J255
Heating, air conditioning system