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Rooftop Air Conditioning System Citysphere
2.2.
Electrical system
An overview about the connection of the modules among each other is given in diagram Fig. 3.1.
The hook-up of the units shall be accomplished according to the circuit diagrams in Fig. 3.2 and Fig. 3.3.
The rooftop air conditioning system features a battery-discharge protection system. The system can be
restarted by switching it on again.
If the vehicle engine does not run, the system can only be operated in ventilation mode. This function can
also be blocked.
The electronic system of the compressor motor includes a soft-start function to prevent current peaks in the
vehicle electrical system. In addition, the electric motor is switched off automatically in the event of
overloads (due to possible system damages). Restarting is effected by repeatedly switching on the system.
2.3.
Principle of operation of the air conditioning system
Once the system is switched on, the outside air temperature and the inside air temperature will be measured
by the control system. A soon as the following conditions are complied the cooling function of the unit starts:
– The vehicle motor is running (signal from D+/61)
– The outside temperature is higher than +17°C
– The inside temperature is higher than +22°C
– The inside temperature is higher than outside temperature minus temperature nominal difference, TSD
(value shown on the panel display)
Cold air
* Ref. to Fig. 2.3
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Circulating air
Fig. 2.4 Cooling operation of the unit
Fresh air
Cold air
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