Originally posted by th2376
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Heating operation, petrol
After the temperature has risen to approx. 72°C, the heating unit switches to energy-saving part-load operation. If the temperature of the coolant continues to rise to approx. 76°C, the heating unit switches to the control pause. This also takes place when the duration of the total combustion exceeds approx. 76 minutes. The circulating pump, the car's own heater blower and the operating indicator remain in operation during the control pause. When the coolant temperature drops to approx. 71°C, the heating unit again switches to part load. If the temperature rises to approx. 76°C, the heating unit switches again to the control pause. If the temperature of the coolant falls due to increased heat requirements during part-load operation, the heating unit switches back to full-load operation at approx. 56°C.
Heating operation, diesel
The heating operation sequence is the same on the diesel heating unit. However, if the temperature of the coolant during the control pause does not drop below approx. 71°C within 900 seconds, the heating unit starts with the next distinction of the coolant temperature of approx. 71°C with the regular starting process in full load operation.
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