Room thermostat

[daly]

Hi all, hope some one could help me here I want to connect my room thermostat to my VAILLANT ECOTEC EXCLUSIVE 838 HE COMBI boiler this thermostat was used for my old vaillant boiler and worked fine only this time I won't be using any time clocks, I want to get it right in my head before I make an connections so here goes

TIA

 

[simond]

You shouldn't use a thermostat without a timer. Will waste energy.

Nevertheless, to answer your question;

Remove boiler link 3 to 4.

Thermostat 1 to boiler 3 (Live)
Thermostat 2 to boiler 4 (Live)
Thermostat 4 to boiler 5 (Neutral)

Sleeve live cables with brown marker, neutral cables with blue.

As your diagram says, the thermostat should be earthed.

 

[gaspro1981]

can you not plug a compatible vaillant clock into the front facia of the boiler to give you correct htg control and then wire in your room thermostat

 

[Deleted member 105431]

much better off with a programmable stat such as the honeywell cm927, or even the Vaillant vrt360 specifically designed for this boiler.

 

[Deleted member 105431]

can you not plug a compatible vaillant clock into the front facia of the boiler to give you correct htg control and then wire in your room thermostat

timewitch 130.

 

[daly]

Thanks a lot for your help guys appreciate what you say about a timer but we have heating on from when we get up till we go to bed anyway so never used the timer on the old boiler anyway.

regards