2 General description Roof-top air-conditioning system CC8
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2.7.7 Axial fans
Each axial fan (12, Fig. 202) includes a single-stage DC motor. After switching the air-conditioning system on, they are
constantly driven by the vehicle's electrical system via a relay to supply the condenser with the required outside air.
2.7.8 Radial fans
Each radial fan (8, Fig. 202) contains a multi-stage DC motor. Cabin air is drawn in by the radial fans and passed
through the evaporator before being returned to the cabin via the air ducting system or the nozzles of the air distribution
panel.
2.7.9 Compressor
The compressor (Fig. 205) consists of a swashplate compressor and the magnetic clutch with belt pulley. The
compressor is switched on and off by means of the magnetic clutch when the air-conditioning system is in operation.
Its rate of flow depends on the engine speed, but is set to ensure a sufficient flow even with the engine idling. When in
operation, it compresses the refrigerant to the required condensation pressure.
2.7.10 Electronic room thermostat (optional)
The deluxe version and the thermostat version have an integrated electronic room thermostat and temperature sensor.
The intake temperature of the circulating air is measured. The compressor is deactivated when the temperature set on
the command value switch is reached.
2.7.11 Fresh air ventilation flap (optional)
The deluxe version includes a fresh air ventilation flap which can be operated with a rocker switch. Control is performed
by microswitches (4, Fig. 202) which deactivate the flap motor when the limit position is reached. A fresh air filter is
provided to trap dirt particles in the outside air.
2.7.12 Circulating air filter (optional)
A circulating air filter can be fitted in the circulating air circuit of the roof-top unit to remove any dirt contained in the
circulating air.
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