Thanks very much both for helping, I will try wiring it as Hardwaregeek says and go from there.Incidently I've ripped out the original as the wiring was a mess which had a Danfloss 240 therm but a semi nice programmer from Heatmiser and so thought I would replace the messy wiring with this with also can use the 5Ghz WIFI frequency moving forward less interference and will be able to use it with automation. If anyone is interested have a look at IFTTT what it can do with the Nest.well illustrated joelk2 by the way they left no room for getting it wrong thank you.
Click to expand.Hi Lynchnigel, I have the same setup as yours (mine is combi 35 so needed to buy the harness) and need some help on a few questions below please:1. Opentherm Harness, once you install it, I assume you no longer need the call for heat wire (black wire on the left that currently goes to the room stat)?2 Once wired for Opentherm, is there polarity when connecting from the boiler to nest heat link?3. I assume your wiring goes as follows: L&N&Gnd from mains goes to the L&N&Gnd of the boiler (do you short the room stat/timer terminals like the picture from the manual?) and L&N of the heatlink, and from the boiler's opentherm harness a couple of wires goes to OT1 and OT2 of the heat link?4. What do you mean by'the connections from the control panel need moving'?Would most appreciate if you can help clarify the above!
First post so let me start by saying hello to all!I'm a plumber not an electrician, nor do I consider myself a heating engineer and would appreciate any help.What I have is a Worchester combination boiler which is currently hooked up to a Honeywell programmable room stat. We have installed UFH in a newly built extension and the client wants independent zone control so he can have the UFH come on before the rest of the heating. I have installed 2x 2 port zone valves each with its own RF digital 7 day programmable thermostat but I'm having trouble getting my head around the wiring. So far I've added a Drayton wiring center hooked up the wires for the zone valves and room stats as per a standard s-plan system but with the UFH in place of DHW, I presume having programmable stats means I don't need a 2 channel programmer? If this is the case, what do I do with the brown wires coming from the zone valves that normally go to the programmer, are they now redundant or do I need to connect them to the programmable stats? After several hours looking at various wiring diagrams and repeatedly banging my head against the desk I'm none the wiser.Please Help!Many thanks. Update.It's working.
Listed below are all the manuals for Ideal. Just click on the model or the Gas council number and the manual will download at the bottom of the page. After you have downloaded the manual double click on the download for the manual to open, if you want to save the download right click.
So today I took the info you guys gave me, binned the old programmer, wired in the two new ones with both commons and the zone valve orange wires going to the boilers Ls terminal, both the call linked to the zone valve browns and back to the boilers Lr terminal and hey presto! So now I can ramp up the temp on either of the stats, the corresponding zone valve opens boiler fires and everything is tickety boo right? When the UFH pump clicks in the main breaker trips and we lose all power.
We're using Polypipe UFH with a 2/3 circuit ZRU, I've installed these before with system boilers in s-plan plus config without any issues, I tried wiring the ZRU to the permanent live from the spur and the brown on the UFH zone valve (a suggestion I found in another thread on this forum) both had the same result - boiler fires runs for a few mins until the UFH pump clicks in (the ZRU prevents this until the water temp reaches 45 degrees) then the breaker trips off. If I disconnect the UFH pump and allow it to run the CH only it works perfectly. I'm stumped.Any ideas, anyone?PS.
It just occurred to me I should have tried swapping the oranges and greys from the zone valves so it's wired as Leesparkykent says. No, the Ls terminal of the Worcester boiler is the live feed to the external controls, so the grey from the valve connects back to that, the orange of the valve connects back to the Lr terminal of the boiler.Reading your other posts it sounds a bit like you've connected your external controls to the live from the switched spur instead of to the Ls terminal? Unless it is an Ri which does not have this terminal then it's not in accordance with manufacturers instructions and they could refuse a warranty claim based on this. Update.It's working.
So today I took the info you guys gave me, binned the old programmer, wired in the two new ones with both commons and the zone valve orange wires going to the boilers Ls terminal, both the call linked to the zone valve browns and back to the boilers Lr terminal and hey presto! So now I can ramp up the temp on either of the stats, the corresponding zone valve opens boiler fires and everything is tickety boo right? When the UFH pump clicks in the main breaker trips and we lose all power. We're using Polypipe UFH with a 2/3 circuit ZRU, I've installed these before with system boilers in s-plan plus config without any issues, I tried wiring the ZRU to the permanent live from the spur and the brown on the UFH zone valve (a suggestion I found in another thread on this forum) both had the same result - boiler fires runs for a few mins until the UFH pump clicks in (the ZRU prevents this until the water temp reaches 45 degrees) then the breaker trips off. If I disconnect the UFH pump and allow it to run the CH only it works perfectly. I'm stumped.Any ideas, anyone?PS.
It just occurred to me I should have tried swapping the oranges and greys from the zone valves so it's wired as Leesparkykent saysCould this be my issue? If so, why is it working without the UFH pump in play? Yes they're both on the same spur. The spur feeds a drayton wiring centre and everything is connected to that.I think I might understand what's happening now. If the stat commons and ZV greys should be receiving power from LS then The ZRU needs to receive power from there too and only the boiler live connected directly to the spur. The the stats call for heat and ZV orange back to Lr to complete the circuit?
I think I effectively had the ZRU live connected to a neutral. I'll be back there tomorrow to try and solve this so I'll let you know how it goes.
Found the problem, the drayton wiring center had a factory fitted link from the live on the spur to the same terminal that I had the boiler LS connected to, so the two lives were crossed. Removed the link, wired the ZV greys & stat commons to the LS, ZV orange to LR, the stats call for heat to ZV brown and ZRU + boiler direct to the spur and its all working perfectly.Many thanks for all the input, not only did it help solve this problem but I learned a few things about what each wire actually does so I'll no longer be blindly following the wiring diagram.
As I discovered not all systems are wired the same and the diagrams are not always 100% accurate.