Temperature Control Wheel

Operation
The nominal value for the inside temperature is set with the temperature control wheels. The temperature values printed on the selector wheels of the operating unit do not correspond to the values which are used by the control unit and which can be read out via the status list, but rather to a comfort temperature. When setting the temperature, the control wheel on the driver's side has priority near the end positions over the control wheel on the passenger's side. In addition, a comfort allowance is implemented within the outside temperature range from 40°C to 25°C (104°F to 77°F). The comfort allowance ranges from 13°C (56°F) at - 40°C (-40°F) to 0°C (32°F) at 25°C (77°F).

When the temperature control wheel on the driver's side is set to maximum heating, the positive supply to the water valves is interrupted by way of a mechanically coupled switch. In this position, the control unit interrupts the diagnostic procedure for the water valves which are open when no power is applied.