Connecting Thermostat To Vaillant 831

[planemad]

Tomorrow I'm going to connect a room thermostat to my vaillant EcoTec 831.

I'm using a Horstmann DRT 2 room thermostat and the electrical connectors are marked as NO-COM-NC.

My boiler has a standard connector block for which the thermostat connects into. connection 3 and 4 is bridged currently and it looks to me like the room stat connect into terminal 4-5 on the boiler.

Can anyone advise me please on which connection are to me made.

And assuming that is is only the 2 conections to me made that I should just use some 2 core cable that I have laying around.

 

[jackthom]

Yes only 2-core cable is required.

At the boiler it's terminals 3 & 4, remove the bridging wire first. (5 is a Neutral which isn't used in this case).

At the thermostat connect to COM & NO

 

[planemad]

Does it matter what colour wire goes to each connection both ends?

 

[simond]

It's nice when someone asks how the job is done.

Then they tell you they know better.

If terminal 3 is an earth, go ahead.

Have a new Vaillant PCB close to hand, and don't touch anything metallic until the fuse blows.

 

[jackthom]

For a 2-wire system it doesn't really matter which colour goes to which.

 

[planemad]

Thanks very much for your help and advice.

 

[planemad]

One more thing please gents.

Do I have to remove the Vaillant 130 analogue time clock from the front fascia of the boiler?

My room stat is also programmable?

Many Thanks

 

[gas4you]

In that case you might as well.