Search the forum,

Discuss Thermostat/Control box help in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Messages
21
Hi all. I'm trying to fit some smart thermostats but they require a mains connection. I have the wiring in place from the existing set up (battery powered thermostats), but they have no mains voltage going through them. The wiring goes to a Danfoss WC4/B wiring Centre as the central heating is split into 2 zones.
Could anyone from the wiring diagrams and the photo let me know what connections I need to make to get voltage to the thermostats? (files attached)

From what I can make out, terminals 1 and 2 that have the black with brown sleeve wires are from the thermostat wiring. The other wires in there are from the valves for the central heating.

Any help is much appreciated. Thanks in advanced.

IMG_20190405_123108.jpg
 

Attachments

  • Danfoss-Wiring-Centre-Guide.pdf
    132.5 KB · Views: 11
Confused, are you running new wiring from the wiring centre?? Some smart stats only work on their own power transformer so require a wall socket. Think you need to elaborate
 
No, the wiring already exists from the wiring centre. These thermostats don't use a transformer, they take a live input direct to the unit.

When I removed the old thermostats, there was already 4 core wiring to them with the blue (live?) and ground wires terminated in the wall, I checked with a voltmeter and there is no power to these wires, so I'm assuming I can somehow put power down the blue wire to the thermostats.
 
Replace the old receiver with the new receiver as that should have had mains voltage.
 
Replace the old receiver with the new receiver as that should have had mains voltage.
Sorry, I don't speak the lingo. What's the receiver? The old thermostats were battery powered, in the wall behind them is 4 core cable, 2 of the cores were connected to the old units. The other 2 cores have nothing going through them. I know from looking at the diagrams for this wiring station that I am able to get live to the thermostats, just don't know how to configure it for my system. Obviously the ground is already grounded, but there is a blue wire in the wall that goes to the wiring stations, but I'm not sure what is the correct way to get live to it.
 
The old wiring for the device that the thermostat talks to, to bring the boiler on and off?
 
So I assume you have a thermostat upstairs and down stairs currently??
 
So I assume you have a thermostat upstairs and down stairs currently??
Yes I do. One controls 1 bedroom and the other controls the rest of the house. The central heating is split into 2 zones. I have a black, brown, grey (with blue sheathing) and an earth behind my existing thermostats, which are battery powered. The grey/blue and earth are terminated, but neither have any voltage or current. The other two, I believe, are the signal wires. Would I be right in saying I need to get live to the blue wire for the new thermostats?
 
Yes I do. One controls 1 bedroom and the other controls the rest of the house. The central heating is split into 2 zones. I have a black, brown, grey (with blue sheathing) and an earth behind my existing thermostats, which are battery powered. The grey/blue and earth are terminated, but neither have any voltage or current. The other two, I believe, are the signal wires. Would I be right in saying I need to get live to the blue wire for the new thermostats?
If you have wiring attached then they are not battery powered mate.
 
So as asked what do the new thermostats require??
 
So as asked what do the new thermostats require??
Some way of routing 240v to them via the wiring box. I am not sure what configuration I need to configure the wiring station to for my system to achieve this. I have 2 heating zones, controlled by their own thermostats and their own danfoss HPA2 valves. The configuration that my wiring station is in, is how the builders have left it and does not match any of the configurations shown in the wiring instructions.
 
Are you competent with wiring?? I think realistically you might need a heating engineer or a confident electrician in as it’s very difficult to work out where power is running to and from without having hands on
 
Are you competent with wiring?? I think realistically you might need a heating engineer or a confident electrician in as it’s very difficult to work out where power is running to and from without having hands on
Yeah I'm fairly competent. I just don't understand the heating system so I have no idea which diagram I need to follow to achieve what I want. I posted the wiring diagrams along with the original post as a pdf. If anyone is able to point me in the right direction I can sort this.
 
You posted a danfoss wiring guide which doesn’t open. Is that for your existing wiring centre or what is required for the new. we’re really having to drag the info out here
 
Last edited:
You posted a danfoss wiring guide which doesn’t open. Is that for your existing wiring centre of what is required for the new. Sorry we’re really having to drag the info out here

Sorry. If I knew it didn't open I'd have explained more right, yeah it's a danfoss wiring centre WC4B, going to 2 separate danfoss HPA2 valves, with 2 thermostats which will require mains voltage to them. Just in case you need it the boiler is a Ideal Logic Combi ES35. I believe the wiring station isn't configured correctly, or is only done to the minimum needed for the existing setup as the existing thermostats are only battery powered. The house is a fairly new build and there are short cuts everywhere. I'll try and upload the wiring diagrams again.
 

Attachments

  • Danfoss-Wiring-Centre-Guide.pdf
    132.5 KB · Views: 8
It’s a low voltage. Battery in thermostat two wires to centre but it’s not right
 
Right let’s start this again. The link you posted DOESNT work so we can’t tell if it’s for the old set up or the new. Do you have two zones and a hot water cylinder?? If you do it’s SPlan plus. We still need to know what the new stat requires wiring wise not just that it requires 240v it’s not just as simple as running 240 up a cable it’s how it all links in. Did you test the existing with a multimeter or a volt stick
 
Right let’s start this again. The link you posted DOESNT work so we can’t tell if it’s for the old set up or the new. Do you have two zones and a hot water cylinder?? If you do it’s SPlan plus. We still need to know what the new stat requires wiring wise not just that it requires 240v it’s not just as simple as running 240 up a cable it’s how it all links in. Did you test the existing with a multimeter or a volt stick
Right, for the new set up I have a logic combi es35 boiler, a danfoss wiring station WC4B, two danfoss HPA2 valves and I will have two Bht-6000 thermostats that will need a 240v feed, an earth and the 2 control wires.

Link to the wiring station diagrams

http://assets.danfoss.com/documents/DOC000086407568/DOC000086407568.pdf
 
You can post that link all day long and harp on about the wiring centre, but in the real world it mean absolutely nothing mate. You may need a complete new wired system or just new supply. But without a pro looking at it you may never get it to work. On that note I’m out.
 

Reply to Thermostat/Control box help in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Creating content since 2001. Untold Media.

OFFICIAL SPONSORS

OFFICIAL SPONSORS

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock