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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Setting up multiple heating zones https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1292174486 Message started by Newby1 on Dec 12^th, 2010, 5:21pm

Title: Setting up multiple heating zones
Post by Newby1 on Dec 12^th, 2010, 5:21pm

Vaillant ecoTEC plus 831 boiler is in and running the house heating and water.
Control of heating is only by radiator valves with the standard analogue central heating timer on the boiler.

I want to add a wireless thermostat for the house.
I also want to add two new heating zones - one to a radiator in an annexe, controlled by another wireless stat - the other to a digistat controlled h/x in the same building.

I think I know how to do this - but can anyone provide me with advice on how they would set up the plumbing and wiring to do this?

One particular question linked to this - these are the instructions for the boiler: http://www.vaillant.co.uk/stepone2/data/downloads/68/43/00/operation-and-installation-manual-vrt-392f.pdf

Does the jumper wire on terminal 3 and 4 needs removing and which terminal do you connect the switch live's to from 2 zone valves to fire the boiler on heat demand and turn it off when the stats are happy?

Thanks for your time
Stephen

Title: Re: Setting up multiple heating zones
Post by Lectrician on Dec 12^th, 2010, 6:07pm

Are you wanting to retain the single time control in the boiler, or remove this and use programmable thermostats elsewhere in the house? (programmable incorporating time control).

Title: Re: Setting up multiple heating zones
Post by thescruff on Dec 13^th, 2010, 1:31am

I don't think you know how to do it, and that's fine provided you don't mess with it, unless you fancy a new boiler for Christmas ;D

First you need to post exactly what you want, for example, add another two zones, that makes three zones.

All the zones will require a 2port valve wires as an S plan, you may also need a by-pass valve on the zones for the pump over-run.

The wiring is quite simple ;D, although you may have problems with two or three wireless stat in the same building, hard wired would be 10 x better.

You'll need a central wiring box, with at least 10 terminals.

The grey in each MV is a permanent live.

T3 in the boiler is the com in the room stats, and switches the brown in the MVs.

T4 in the boiler is the switch live and connected to the orange in the MVs.

T5 in the boiler is the neutral.

Plus you'll need a L-N-E fused supply in the junction box.

See I told you it was easy. [smiley=thumbsup.gif]

Title: Re: Setting up multiple heating zones
Post by Lectrician on Dec 13^th, 2010, 6:34am

thescruff wrote on Dec 13^th, 2010, 1:31am:

Plus you'll need a L-N-E fused supply in the junction box.]

The vaillant has a set of terminals adjacent to the 3/4/5 thermostat terminals which provides an auxiliary permenant live and neutral.

If using 240v controls with the boiler, you will not be able to utilise the ebus wiring or controls (like the stat you link to).