UDRF01.04GB
Maintenance manual DRF 400–450
9 Frame, body, cab and accessories – 9.4 HVAC 13
page –
Air conditioning, function description (product
alternative ECC)
Air vents
As an option for the heating system there is an air conditioning sys-
tem, this combination is called (ECC) and handles heating, ventila-
tion, cooling, and dehumidification.
The temperature in the cab is thermostat-controlled by control unit,
cab (D790-1). The cab temperature is controlled against set temper-
ature. The temperature can be set between 16 and 28 °C. The unit
is operated with controls on the instrument panel.
For cooling the compressor is activated and compresses the refrig-
erant. The refrigerant evaporates in the evaporator in the cab. When
the refrigerant evaporates cold is generated in the evaporator. When
the cab air is forced through the evaporator by the cab fan, the air is
cooled. Then the air can be controlled in the same way as for the
heating system.
The air conditioning system adds the following functions to the heat-
ing and ventilation system:
• dehumidification of the air when it is moist (humid)
• cooling of the air when it is warm
4. Sensor cab temperature (B775-1) 13. Actuator recirculation (M612)
5. Sensor temperature outlet fan (B775-2) 14. Fan motor heat (M657)
6. Sensor outdoor temperature (B774) 15. Damper motor (Y672)
7. Sensor engine temperature 16. Switch defroster on Control unit KIT (D790-2)
8. Control unit cab (D790-1) 17. Operating menu on Control unit KID (D795)
9. Sensor temperature in refrigerant circuit (B775-3)
001839
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