Webasto KK2000 E Installation And Service Instructions Manual - page 12
Roof-Mounted Air Conditioner KK2000 E
Page 12 / 30
2.5
Design, Task, and Function of the Components (figure 2.4)
Condenser
The condenser (3) consists of a continuous helical tube and blades that are connected
together to a large heat exchange surface.
It cools down the hot coolant gas until it liquefies and is undercooled, and it transfers the
condensation heat over the blades to the outside air that flows through them.
Accumulator dryer
The accumulator dryer with glass front (13) is a compensation and storage container for
coolant. The lower section contains drying granulates that extracts small amounts of
water from the coolant and chemically binds it. This reduces the danger of icing in the
expansion valve and protects the compressor from damages. During operation, the
glass front (14, figure 2.4) shows if enough coolant is in the system.
Thermostatic expansion valve
The thermostatic expansion valve (11) regulates the flow of coolant to the vaporizer
according to the coolant needs or the temperature in the vaporizer. The thermostatic
expansion valve is the control element between the high pressure and low pressure
sections in the coolant circuit.
Vaporizer
The vaporizer (6) has the same basic design as the condenser. In this, the coolant
flowing through the lines from the expansion valve converts from liquid to gas and is
overheated.
The necessary steam heat is drawn over the blades from the flowing cabin air and
transferred to the coolant through the pipe walls. The cooling air is dried and the
condensation water from this is lead outside.
Pressure switch
The high pressure and low pressure switch monitors the pressure ratios in the high
pressure section of the coolant circuit and uses the magnetic coupling to switch the
compressor off if the pressure drops too low (such as a loss of coolant) or if the
pressure is too high (such as overheating in the condenser).
Thermostat switch
The thermostat switch (12) is a temperature switch. It measures the temperature
between the vaporizer blades and switches off the power to the compressor’s magnetic
coupling if there is a danger of icing and, after a slight warm up, switches it on again.