Fitting Siemens Wireless Room Stat to Vaillant Ecotec 831

planemad · 17 Sep 2009

Hi gent

Can someone please advise me on how to fit a Siemens RDH 10RF wireless room thermostat to a Vaillant Ecotec 831 Combi?

The Ecotec has a Live Neural and Earth terminal which connect to the main supply which powers the boiler.
The boiler also has terminals 3 4 5 which look like one is earth and the other 2 are for the thermostat switch.

The Wireless roomstat has a sender box that needs to wire into the boiler.
The wiring diagram is in this link http://www.screwfix.com/sfd/i/cat/pdfs/87/p4766387.pdf

Can anyone please advise me on this as I plan on doing this at the weekend.

Many Thanks

Planemad

doitall · 17 Sep 2009

Remove the link between 3-4.

T3 to L1

T4 to LX

You also need a L & N from the boiler supply.

picasso · 17 Sep 2009

a slightly simpler way to do it

boiler / reciever

3 to L

4 to L1

5 to N

link L and LX in the reciever

doitall · 17 Sep 2009

picasso said:
a slightly simpler way to do it

boiler / reciever

3 to L

4 to L1

5 to N

link L and LX in the reciever

Don't be mental, the Vaillant is volts free and that wouldn't work anyway.

It switches between L1 & LX

picasso · 17 Sep 2009

sorry doitall but every vaillant I have installed has 3 4 and 5 as 240v, 3 is live send, 4 is live return and 5 is neutral, so the layout is correct

londonboy · 17 Sep 2009

Picasso has it, there isn't a L1 and lx
Are you confusing another manufacturer?

picasso · 17 Sep 2009

londonboy have a look at the link the op has posted, the wiring diagram shows L1 LX and L2

londonboy · 17 Sep 2009

Oh yeh sorry I misread. Have realised those terminals are in stat.

But anyway what you have said should work
(don't forget the link between L and LX!!)

doitall · 17 Sep 2009

Gordon bennett.

If you link L to LX the bloody boiler will be on 24/7

picasso · 18 Sep 2009

dia with all due respect, read the instructions LX is common in the reciever and L is permanent live so linking them does nothing more than make LX (which is common) live until the relay is switched linking LX and L1 bringing on the boiler.

doitall · 18 Sep 2009

So your saying Boiler first.

3 to L.
5 to N.
4 to L1

and link L to LX in the timer.

Either works or it don't, never too old to learn as they say.

londonboy · 18 Sep 2009

doitall that stat is volt free, hence the link

doitall · 18 Sep 2009

londonboy said:
doitall that stat is volt free, hence the link

Yes I know, it switches 3-4 in the boiler or L1-Lx in the timer.

You only need the 240v to run the clock etc

planemad · 18 Sep 2009

Sorry Lads - have we worked out how to do it yet?

really need to know as I want to do this tomorrow.

Thanks

doitall · 18 Sep 2009

Yes go for my 2:17 post which is what the others agree with, or should that be I agree with

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Fitting Siemens Wireless Room Stat to Vaillant Ecotec 831

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