joeirish

That looks like the job! I've been waiting for Salus to come back to me but not heard anything yet today. Thanks

Thanks.

OK, I have looked at some of these but it's not clear if the thermostat part has a clicking relay? How can I tell?

That sounds interesting. Not sure what you mean though, do you have any suggested devices?

Thanks.. Just unscrewed the one in our bedroom and it is a Salus ERT32, 230V. Not sure if you know of a suitable replacement, not necessarily by Salus.

Thanks for the reply. The controller is a German make, OEG. The room stat is Salus. It is connected by wire to the controller and the controller is then connected to the wiring centre and then onto the actuators on the manifold. I've attached a pic showing the controller and manifold. The wires coming out of the wall just above the wiring centre are from the controller, one for each heating zone. Sorry, I think I got that wrong. The wires coming out of the wall above the wiring centre (white box with cable tie holding it closed - catch is broken) I think are the wires from the different room stats. Does that make more sense?

I'm not sure if this is the right forum for this, mods please move if required. We have a room stat in our bedroom. But the relay has a really loud click each time the stat turns on or off. It is wired to the UFH manifold wiring centre. What I wold like to know is if there is a silent or very quiet room stat that I can get to replace this noisy one. Thanks

Thanks again. I might try a local plumber and see if he can do this. A bit beyond my abilities!!

Hi Conor Thanks for the suggestions. The boiler is also only four years old the entire system was installed when the house was built in 2015. I've no problem flushing the system and adding inhibitor but I think it is under some pressure so not sure if I can just do it with a filling loop as you suggest. How would that work? Thanks

So do I need to flush out the system or is it OK just to leave it as it is Thanks

I just remembered that the pressure dropped a few times and I had to open a feeder valve (sorry about my lack of plumbing knowledge!) to raise it again. It hovers around 1 bar. Not sure if that says anything to help.

Hi Peter Inhibitor was used when it was first commissioned. It is a sealed system as far as I know. But it is a strange set up as I've posted here previously. The fluid is heated by both the boiler and the thermal store. The circuit from the boiler to the thermal store has the ufh cirucits connected to it.

Folks I took a good look at my four year old ufh manifold today because one of the accentuators was sticking. I discovered that the pin that opens and closes the valve had stuck and there was a bit of rust around it. I got it sorted with some WD40 and a bit of judicious tapping with a hammer and it seems to fully work again. I then noticed the gauges (?) that show the rate of flow and all that are in use had rusty coloured water in them. I attach a photo. Different circuits are different shades of brown. One gauge is still the original clear colour but this circuit is not connected (3rd from the right in the photo). The water is heated via an oil boiler. Should I be concerned and should I do something such as have the entire system flushed out and the fluid replaced? Thanks

I uncovered everything for the photo. These pipes on the top are usually covered with a layer of insulation. The ones by the pump are in an insulated area, the outer insulated casing has been removed. Do you think they need lagging as well as this.

PeterW Thanks for that explanation. Beginning to be clearer now. I can't see a gate valve on the flow but there does seem to be some sort of isolating val either side of the boiler pump. I'm attaching a couple of photos. First shows the pump and the two valves. The second shows the top of the boiler cabinet. The lower pipe is labelled "Heating Flow" and has the sensor from the control unit attached by the cable ties.

I've been trying to get my head around this. Excuse the beginner's questions but what do you mean by the zone valve being energised? Any links to wiring diagrams etc. Thanks

So I have to figure a way of getting two independent circuits. That's the question. I'll have to see if Peter's idea would do this by having a zone valve would do this.

Thanks for that. So it is possible to have that type of set up. The question is now how to achieve this. I have had the original installation guide from Latento who made the TS. And essentially with this type of set up the boiler provides the heat for the UFH and the TS is used just for the DHW. Not what I wanted though. So now I'm trying to find out the best way to make the system do what I intended.

That is the TS on the left. But when the UFH pumps starts up it circulates the UFH fluid first to the boiler (which is about 5 metres away and outside the house in an external casing). On the occasions when the boiler would not fire up the UFH just had cold fluid circulating even though the TS was hot. I only became aware of this recently when the boiler stopped working.

Thanks for that. In answer to your questions, the TS has two sensors that measure the temp up high and further down. The is a stat valve on the manifold is that what you mean? There is also a pump on the ufh manifold. I've attached a photo of the set up. The two grey lagged pipes on the left are the flow and return from the boiler. You can just make out the spurs going to and from the manifold. The mixer valve is on the top left and the pump is the green device. The red dial controls the pump speed.

I have a system that I had installed four years ago when we built our house. It is near passive spec. The system has recently has being causing issues. Hopefully others will be able to understand my description of the system and the issue.. Essentially I have thermal store that is heated either by PV powered immersion and/or condensing oil boiler. I have UFH and wet towel rail and skirting rads (never used) upstairs. The way the system was installed is similar to others described here, PV heats thermal store for DHW and the boiler mainly heats the UFH. I had always assumed that the boiler would heat the thermal store (there is a flow and return to the thermal store from the boiler) and that the UFH and DHW would draw from this. The installer has taken spurs off the pipes to and from the boiler and connected these to the UFH manifold. Each time the ufh comes on the boiler fires up for a while. So essentially the ufh circuit goes from the house to the boiler outside and then back again. It was when the boiler stopped working a couple of weeks ago even that I suspected there might be a problem. What happened was that even though the thermal store was quite hot (70 at the top and 55 lower down) I was only getting cold water circulating round the ufh! It looks like the ufh circuit is actually not flowing via the thermal store at all but just via the boiler. The boiler is now fixed and once again I have the situation where my ufh is really working like large rads, the floor gets quite warm when the ufh pump is on and then gradually cools once the timer turns off the ufh pump. It would seem that the high temperature from the boiler flow My ideal design was that the TS heats up using either the PV powered immersion or the boiler and then the heat from this is used for UFH and DHW. Only if the TS drops below a certain temperature does the boiler fire up. So is it possible to have such a system? Unfortunately the installer is not around any more to help.

Thanks for that. The forum was just changing over when I was last here. It's great to see that it's still alive and well. I'll check out that archive. Joe

Hello again It's been about four years since I was last here. Built the house (near passive standard) in County Clare. I did have a blog on the previous version of this forum but no idea where it is now. Anyway I have some issues on heating that I'll try and post in the appropriate place. Great to see that this is still so vibrant and some old faces still offering great advice. Joe