3 channel to 2 channel controller?

Caoimh1n · 28-11-2015 08:17PM

I'm glad I didn't start my install just yet so. It sounds to be a bit of a pain at the moment, but I'm sure you will get there in the end.

Deanicus · 28-11-2015 11:05PM

SOLVED!

At least I think it is! Might be premature again but it is looking good.

I remembered a response I got from Tado when I asked this very question. They mentioned that if hooking the extension kit in that I needed to wire the heating channel that tado controlled into it also.

It seems that when an extension kit is present the thermostat stops communicating directly with the boiler/programmer and instead wants to use the extension kit to communicate. When I did my first wiring I only hooked the hot water in so that is why the thermostat was no longer controlling the heating as it was trying to use the extension kit. The horstmann was back controlling the heating so when I set it to always on it did what it was supposed to do. Since it was not receiving any thermostat info it kept the heating on constantly.

Now why that would mean the water was on too I am not sure but it was probably a quirk of the wiring.

I have now wired the heating channel directly to the extension kit (I could probably do the same with the hot water too but left it as nmacc advised.) All seems to be working. The thermostat started the heating when asked and it also started the boiler when asked to heat the water. Whether the water will heat with the heating on too remains to be seen but it looks good.

Caoimh1n I am not sure how exactly this affects your setup but I think you will need to make sure that you do the same i.e. have a heating channel wired to the extension kit too

When they release the additional thermostats I think I will completely replace the horstmann. I will have to wire the 2nd heating channel and 1st together but I wont lose zone control as the thermostats will control them

Deanicus · 10-12-2015 05:49PM

Just thought I would report back that the fix in my last post did in fact work and everything is going well.

I also have been contacted by tado to say that their additional stats are shipping next week but the software for multi zone is delayed til January.

When I get them installed I will then replace the horstmann altogether and let you know how I get on.

Whilst my initial question has been answered I find it is good to come back with any updates etc. When researching a lot of this and other things I always found it frustrating that people would not come back and say if they solved it or not

Caoimh1n · 12-12-2015 01:17AM

Hi Deanicus, thanks for feeding back your experiences. It seems like you are well up and running.

Unfortunately I decided to return my Tado as it seemed to be a lot of work. I have , however, just received the Nest v3 and will give installaton a go over the weekend. The nest supports hot water tanks out of the box, so "should" be more straight forward.

I took the front off the boiler this evening to have a quick look, but haven't a clue yet where to start.

These are links to the boiler wiring diagram, and the nest installation booklet:

hxxp://1drv.ms/1UeX3Xg (I'm a new user so can't post proper urls. Just change the hxxp to http

)

What do you think?

HectorHugo · 12-03-2018 02:24PM

Hi Deanicus,
Coning into this rather late but was wondering if you got the Tado Extension Kit working in place of the H37XL completely?
I currently have the Horstmann controlling 2 heating zones and the hot water. I have installed 4 Tado smart thermostats in place of Honeywell DT90e wired thermostats and these control the heating nicely.
What i want to do now is be able to also control the hot water remotely via the Tado so am thinking of installing the extension kit. Can i wire both heating zones that currently connect to terminals 1 and 3 on the Horstmann into one terminal (4 i think it is) on the Tado?
Since all zones are now controlled by the smart stats i no longer need to time the 2 zones separately.
Many thanks.

Deanicus · 13-03-2018 12:09AM

HectorHugo wrote: »

Hi Deanicus,
Coning into this rather late but was wondering if you got the Tado Extension Kit working in place of the H37XL completely?
I currently have the Horstmann controlling 2 heating zones and the hot water. I have installed 4 Tado smart thermostats in place of Honeywell DT90e wired thermostats and these control the heating nicely.
What i want to do now is be able to also control the hot water remotely via the Tado so am thinking of installing the extension kit. Can i wire both heating zones that currently connect to terminals 1 and 3 on the Horstmann into one terminal (4 i think it is) on the Tado?
Since all zones are now controlled by the smart stats i no longer need to time the 2 zones separately.
Many thanks.

Yeah it's possible now. I have 3 thermos over 2 zones and the hw all wired into the extension kit

Another boards user pm'd me on this awhile ago. I'll see what I can dig out and post here

Deanicus · 13-03-2018 12:40AM

Ok, so I stupidly didn't save my reply to the pm but from memory it's like this

If you look at the back plate of the extension kit, there are 9 terminals with 6 in a group and 3 in another. Don't worry about the 3. There are 2 possible configurations but you want switched live which means you have the jumper pin with the notch in the down position

On the back plate in the 6 grouping, starting from the left, 1 and 2 are neutral and live respectively. Rewire these these from the horstmann. You then need to wire the 2 heating channels from the horstmann (1,3) into terminal 4 of the extension kit (as you said) . Finally wire the hw (5) from the horstmann into terminal 3 of the extension kit.

Now I'm not sure if this next part is necessary. When I installed the additional stats I was having issues. Turns out I wired the stats wrong but in my defence the instructions were a little unclear. Tado support had me do this but I can't remember if I removed it after it was sorted and it still worked or its still there

You have to then put in a bridging wire and connect terminal 4 to the live terminal.

That's pretty much it. The above is from memory and some consulting of the wiring diagrams. If you haven't already I'd look them up for both the extension kit and the horstmann. I'd also label the wires when still connected to the horstmann back plate as they can be confusing

Having said all that I suggest you talk to Tado support. I found them excellent and they can provide instructions for you either in pdf form like with the installation of the stats or can talk you through it.

Good luck! It's a class system. Been really happy with it despite the initial installation woes

3 channel to 2 channel controller?

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