What's Yellow?

[PlumbersMate]

Took a Cover Plate off today to see how a 3 port valve was wired in and there were 3 different cables run in all consisting of the following colours, Red, Blue, Yellow and Green/Yellow. What are the Yellow wires? Here's a pic. Cheers

 

[hammers4spanner]

signal wires??

 

[dancinplumba]

usually return live, should be sleeved with brown. tut tut sparkies eh?

 

[Blake]

Have a look through here, you can then trace each wire off the valve which should tell you what each wire on the other side of the connector block is doing

http://www.google.co.uk/url?sa=t&rc...=Abv_FacGed6pE8JLKYTw0w&bvm=bv.42261806,d.d2k

 

[PlumbersMate]

Have a look through here, you can then trace each wire off the valve which should tell you what each wire on the other side of the connector block is doing

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&sqi=2&ved=0CEUQFjAA&url=http%3A%2F%2Fwww.honeywelluk.com%2FDocuments%2FFull-Install%2Fpdf%2F1083.pdf&ei=F9AbUfvnH-Sa0QXs4YDQBA&usg=AFQjCNGpxW7HHIfSo_cTt284EEwRQHn5Hw&sig2=Abv_FacGed6pE8JLKYTw0w&bvm=bv.42261806,d.d2k

I had that with me mate but tbh all the wires just confused me. I reckon I could have worked it all out if there was one cable in there that was just blue brown and green/yellow as I assume that would be the boiler but there wasn't anything like that? Was well beyond me tbh so recommended a sparky. Need to get on the Honeywell Wiring course sharpish!

 

[PlumbersMate]

I'm guessing it would have been a lot easier if it was a wiring centre rather than just connector blocks. For instance 2, 1 & 3 from the Room Stat means nothing to me tbh haven't got any experience of system wiring

 

[R1CKY]

I would say:

The yellow connected to the orange is the switched live to the boiler. The yellow connected to the white is the "Normally open" or "Demand" from the room stat.

The yellow connected to the blue and grey wires is the "HW OFF" wire from the timer.

 

[tamz]

The only wires you can be sure of are the earths and if all blues go together they are probably neutrals. Everything else is in the head of the guy who wired it (probably a spark) and are just switch wires.
Easy enough to follow if you think about it.
Starting from the bottom.
1. Hw on from cyl stat, pump and boiler switch lives and the orange to the valve
2. Hw off from clock, hw sat from cyl stat and grey to valve.
3. Heating on from room stat and white on valve
4. Probably boiler switch live linking to 1
5. Possibly a permanent live.

Neutrals and earths are below the other connectors.

Test them to confirm.

 

[hammers4spanner]

think honeywell do an app which tells you how to wire different systems

 

[PlumbersMate]

The only wires you can be sure of are the earths and if all blues go together they are probably neutrals. Everything else is in the head of the guy who wired it (probably a spark) and are just switch wires.
Easy enough to follow if you think about it.
Starting from the bottom.
1. Hw on from cyl stat, pump and boiler switch lives and the orange to the valve
2. Hw off from clock, hw sat from cyl stat and grey to valve.
3. Heating on from room stat and white on valve
4. Probably boiler switch live linking to 1
5. Possibly a permanent live.

Neutrals and earths are below the other connectors.

Test them to confirm.

The bloke who owns the house was a sparky so to him was probably piece off piddle