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| Terminal 30 from 2nd battery |
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| “Heater on” signal from pre-selection clock -E111- |
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| Temperature at coolant temperature sender for heater -G241- below approx. 77 °C |
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| Temperature at ambient temperature switch -F38- below approx. 10 °C (TDI only) |
Note | If the temperature at the flame monitor -G64- is greater than 70 °C, it will be cooled for 4 minutes at a higher blower speed. Then the unit will start. |
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