| Regulation of auxiliary heater -D5W- Z |
| The auxiliary heater -D5W- Z is intended to assist the heating output of the engine by heating the coolant. |
| Various operating modes can be set depending on heat required in heating circuit: |
| After the engine is started at an ambient temperature of below approx. 10 °C and if the coolant temperature is below 75 °C, the heater unit switches on. |
| If the heat required is 5000 watts (100% of heating output), then the heater unit operates in full load mode. The coolant temperature increases up to 85 °C (maximum). |
| If the coolant temperature reaches approx. 85 °C, then the heater unit operates in part load mode. |
| If the heat requirement is larger than 2200 watts then the coolant temperature will decrease. When the temperature reaches approx. 78 °C, the heater unit operates in full load mode again. |
| If, because of the low heat requirement, the coolant temperature increases further, at approx. 88 °C the heater unit goes into the run-on phase and is switched off after approx. 100 seconds. |
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