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| If the additional heat switch is closed, the electronics in the Heating control unit -J65-, with the ignition turned on, switches through contact “7” earth to the Additional air heating control unit (00483) -J604-. The Additional air heating control unit (00483) -J604- detects that additional heating potential is required and activates the electric additional heater, if in addition the other conditions for activation in the Additional air heating control unit (00483) -J604- are complied with. |
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