Room thermostat

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Are you getting the item, or has the customer already purchased it? There is an instruction sheet in the box with the terminal designations, Its just a temperature controlled switch, With live in, switched live out plus a neutral to work the indicator lamp and a small internal heating resistor to stop the thermostat from fluctuating with small temp changes in the room. Is this a replacement for an existing thermostat or have you got to to install new control wiring back to the boiler control wiring box?

Doc H.

 
is it being fitted to a combi ? is it a new install or replacement Stat?
it is fitted to a vaillant turbomax plus 824e and I have no manual with it so any help is greatly appreciated, it is an addition to the boiler.

 
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