Connecting Heatmiser UH1 W to a Vaillant EcoTEC Plus 837

[DPavitt]

Can anyone please help?

I'm in the process of wiring a friends Heatmiser wiring centre to a new Vaillant EcoTEC plus 837 boiler and do not have the wiring diagram for the wiring centre.

Could someone confirm if the boiler enable terminals on the unit are volt free contacts? If so I'm assuming its just a simple removal of the jumper between terminals 3 & 4 on the boiler and wire to the two terminals on the wiring centre.

Thanks

 

[wannocks]

Terminal 3 will give you 230v out to the external controls.
4 is the 240v return to activate the boiler.
5 is a neutral for external controls.

There is no volt free control option on an Ecotec.

http://www.vaillant.co.uk/stepone2/data/downloads/d7/42/00/ecotec-installation-and-servicing.pdf

 

[DPavitt]

Excellent, thanks for the help.

So I just take the 230V out from the boiler terminal (3) to the (IN) on the wiring centre and wire the (OUT) on the wiring centre to terminal (4) on the boiler. Thanks again.