Hi I have just purchased a new VRT360 digital room stat and have tried linking it to my ecotec831 boiler but I get nothing on the display.

I have connected it using the old cable for the old thermostat making sure only the same two cables are connected to the boiler and the stat using the ebus connectors.

Do I need different cable for the ebus?
Does anybody have any experience of ebus controls?

I assume the control get's it's power using the ebus connection.


Any help would be gratefull?

On Tue, 16 Aug 2005 11:22:35 +0100, elad wrote:


Hi I have just purchased a new VRT360 digital room stat and have tried
linking it to my ecotec831 boiler but I get nothing on the display.

I have connected it using the old cable for the old thermostat making
sure only the same two cables are connected to the boiler and the stat
using the ebus connectors.

Do I need different cable for the ebus?
Does anybody have any experience of ebus controls?

I assume the control get's it's power using the ebus connection.


Any help would be gratefull?

All Vaillant boilers (that I have so far seen) are fired for heating by
joining Terminals 3 and 4 on the boiler. These are at mains voltage.

It might be that a special Vaillant controller connects elsewhere - but
I'm not yet familiar with those types...

OK I've just familiarised myself.
Oh sh*t..... The existing cabling probably used 230V the new unit is
something electronic. The new unit simply connects directly using a pair
to the terminals on the boiler marker 'ebus'.

The instructions say to bridge 3-4 in the boiler. (So it works!).

I hope that you have not fried your RT 360 by applying mains to it. 8-(


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html

Hi Ed
Thanks for the reply
The pins 3-4 are still bridged.

I initiallaly forgot about the old timer switch when I first tested the stat so the wiring from the stat was connected to the old timer.

I then removed the old timer and joined only the two cables that would be ging back to the boiler.

By having it connected to the old timer switch first would this have sent 230v back to the stat?

should the old stat cable I am using be ok if I've not fried the stat?

Thanks

Elad