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Caravan & motorhome technical questions

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Question

I have a Lunar Lexon 585Si 2008 'Van to which I have tried to connect a newly bought Truma damper/pressure switch. How do I connect the electrical supply? The Lunar pressure switch has only two connections (three wires) the Truma has four connections, I am confused and the Truma installation guide is no help. Can you help me please? Many thanks, H.J.R.

Answer

When looking at the front of the damper the connections on the left is the 12 volt supply (positive and negative) from the caravan battery and these wires should have a cross section of 0.75mm. The connections on the right connect to the water pump, again positive and negative.
I hope this helps.