S Plan with strange wiring

[the_ace]

My friend moved into an ex council house and wanted me to go and have a look at the heating. She was complaining of the heating coming on when she turned on the hot water. I thought this will be straightforward enough - c/h zone valve will be stuck open.

I went to have a look tonight and found that on both zone valves the grey and orange cables are cut at the valve and not connected to the junction box, only the earth, brown and blue are connected. When you switch the power on at the fuse spur the boiler fires up without any call from the programmer.

The junction box is a Danfoss BEM 4000 which I have never seen before.
I'm guessing someone who has no idea how to wire up an S plan has thrown it together just to get it coming on. I'm thinking i'll end up replacing the junction box and rewiring it all.

Has anyone come across this before?

 

[Puddle]

I think it is how you say,a diy job,re wire as said,hopefully if you reconnect gray and orange the valves will be ok to use

 

[CES]

PM me, Ill send the installation manual for BEM 4000, its a boiler management system.

 

[CES]

or can I mail it to you puddle for inclusion in Boiler manuals?

 

[Puddle]

or can I mail it to you puddle for inclusion in Boiler manuals?

that would be good ces


here is some info


http://www.download-it.org/free_files/filePages%20from%20Chapter%2011.%20Ancillary%20controls.pdf

 

[the_ace]

Cheers gents, CES i've PM'd you hopefully that will help me figure out whats what with the wiring although I have a feeling that I may be best to start from scratch.

 

[CES]

Ive sent the file, I think its probably gonna be a rewire job anyway ace, I think these are getting on a bit now.

 

[the_ace]

Cheers for that CES, yeah I'll be happy to see the back of that horrible old thing. Must have been state of the art back in the day when it was installed.