Webasto KK2000 E - Page 11

Roof-Mounted Air Conditioner KK2000 E
Page 11 / 30
Coolant lifecycle (figure 2.4)
When the air conditioner is switched on, the compressor (18) links up using the
magnetic coupling and is run by the vehicle’s engine drive belts. It compresses the
coolant gas and transports it to a condenser (3) where it is condensed by heat exhaust.
The condenser transfers the condensation heat to the exhaust air ventilated through the
condenser (19 and 20). The axial blower (4) provides sufficient ventilation even if the
vehicle is not moving.
The liquid coolant flows through the accumulator dryer (13) to the expansion valve (11),
it relaxes with regulated pressure drops and returns to the gas form after intense
heating in the vaporizer (6).
The warm air (21) in the vehicle cabin is sucked in by the radial blowers (5), cooled in
the vaporizer, dried and returned to the cabin through a air manifold plate (22). The
condensation is separated and sent out.
During operation, the coolant cycle is monitored by the thermostat switch (12) (S2, see
circuit diagram, figure 3.1) and the pressure switch (15) (S3, see circuit diagram, figure
3.1). These two switches are used to turn the magnetic coupling on and off and to
couple and uncouple the compressor.
When the air conditioner is switched off, the magnetic coupling and the blower motors
will have no power. The coolant system and the air circulation system are switched off.