Tado connection to Vaillant Ecotec Plus 831

[Euxton]

Hi guys

I am looking to replace current Honeywell 921 wireless programmable room stat with Tado v2 stat.

From reading other posts , I am guessing that only COM and NO needs connecting, however when removing the cover off the Honeywell wireless received, I am kinda lost at that looks to have been wired differently.

Have attached pics of the wireless receiver connections.

For info, I am not going to use the extension as stat in same room as the boiler is fine so wiring tado directly, just want the old man to be able to switch off and on via his phone when he wishes.

Any help and advice would be appreciated.

 

[cliffa]

Looks fairly normal according to the combi wiring option. They just haven't run the permanent live feed to the boiler via the relay box. http://www.free-instruction-manuals.com/pdf/pa_458227.pdf I'm going to be fitting a a Tado myself when I get new boiler. I guess you got the bargain from O2?

 

[Euxton]

Looks fairly normal according to the combi wiring option. They just haven't run the permanent live feed to the boiler via the relay box. http://www.free-instruction-manuals.com/pdf/pa_458227.pdf I'm going to be fitting a a Tado myself when I get new boiler. I guess you got the bargain from O2?

thanks for your reply, how'd you guess on the tado from O2
Old man has been asked me to get him a phone operated one for ages so was the perfect opportunity to keep him happy.
Do you know which ones do would still need to go to COM and NO on the tado? The rest I can park.

 

[cliffa]

I'm an avid hotukdeals follower so bagged one for my new install - I'm fitting the extension kit too. It is just the wires on A & B that you connect to the Common and NO. they are dry contacts so doesn't matter which way.

 

[Euxton]

I'm an avid hotukdeals follower so bagged one for my new install - I'm fitting the extension kit too. It is just the wires on A & B that you connect to the Common and NO. they are dry contacts so doesn't matter which way.

Hotukdeals has saved us a fortune, however at times the addiction gets me buying things I don't really need, lol.

I have the extension at my place, usually can be picked up on the old bay for around £50.

Thanks for the advice, so no Live needed right?

 

[cliffa]

The Tado will need a live and neutral to power it, just like the relay box it is replacing - I take it you have downloaded the install instructions with wiring info. Yes I got the extension off flee bay paid about £58 as they were obviously being snapped up by O2 tado buyers !

 

[Euxton]

The Tado will need a live and neutral to power it, just like the relay box it is replacing - I take it you have downloaded the install instructions with wiring info. Yes I got the extension off flee bay paid about £58 as they were obviously being snapped up by O2 tado buyers !

yes, the instructions (attached) just show 2/3 wires. NC is only rarely used I read.

 

[Dan Robinson]

Don't forget the 26.9 checks afterwards.

 

[cliffa]

The Tado will need a live and neutral to power it, just like the relay box it is replacing - I take it you have downloaded the install instructions with wiring info. Yes I got the extension off flee bay paid about £58 as they were obviously being snapped up by O2 tado buyers !

Scratch that - of course the thermostat bit is battery powered duh, so no mains wiring required. Just the Common and NO.

 

[Euxton]

Scratch that - of course the thermostat bit is battery powered duh, so no mains wiring required. Just the Common and NO.

lol, I was thinking that, but get why you mentioned as extension kit needs power
thanks for the help

 

[Euxton]

Don't forget the 26.9 checks afterwards.

Definitely