Residual engine heat utilization function

Residual engine heat utilization function of automatic air conditioning

The residual engine heat utilization permits to heat the vehicle also when the ignition is switched OFF. To do so the system utilizes the residual heat from the engine and guides it via the blower into the passenger compartment. The residual engine heat utilization is only possible when the ignition is switched off.

After pressing the REST button (  ) on the control and operating unit of the automatic air conditioning, the default program run is as follows:

 Duo valves regulated

 Heating water circulation pump ON

 Blower is automatically supplied with a control voltage of 1.6 V (initiated after 6 second delay)

 Defroster, footwell and temperature regulating flaps are automatically adjusted

 Diverter and fresh air/recirculated air flaps are closed

 Activated charcoal filter flap open (no activated charcoal filter operation possible)

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End of program

 Repeated pressing of REST button (  )

 Expiration of time function of 30 minutes (repeated actuation possible)

 At a battery voltage of less than 11 V the word REST on the display starts to flash on and off

 Ignition ON

 During the residual engine heat utilization function, no function buttons are accepted with the exception of the REST button (  ), the set point adjusters and the rear window heater button.

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