central heating

[doakster]

i am a spark who has inherited a central heating problem. The system is plumbed and has a Greenstar 30Cdi boiler with 2 motorised valves - CH and DHW - it also has CentreStore unvented mains pressure water heater cylinder and a Heatmiserwireless receiver roomstat any advice on wiring this system would be greatly appreciated.

 

[Chri5]

http://wiki.diyfaq.org.uk/index.php?title=Image:S-Plan-Wiring.gif

Use the diagram above with the boiler MI's for connections and you should be fine.

What exactly is the problem ? (i've alway found 2 seperate valve systems) easier to sort, because it tends to be either hw or ch problem, not both)

 

[doakster]

http://wiki.diyfaq.org.uk/index.php?title=Image:S-Plan-Wiring.gif

Use the diagram above with the boiler MI's for connections and you should be fine.

What exactly is the problem ? (i've alway found 2 seperate valve systems) easier to sort, because it tends to be either hw or ch problem, not both)

the boiler has a volt free channel for cylinder connections an d i can't fathom how a get a live return to open the DHW zone valve

 

[doakster]

http://wiki.diyfaq.org.uk/index.php?title=Image:S-Plan-Wiring.gif

Use the diagram above with the boiler MI's for connections and you should be fine.

What exactly is the problem ? (i've alway found 2 seperate valve systems) easier to sort, because it tends to be either hw or ch problem, not both)

the boiler has a volt free channel for cylinder connections an d i can't fathom how a get a live return to open the DHW zone valve

the central heating side seems straight forward - feed out to room stat return to boiler and switched return to zone valve - its the DHW that seems complex

 

[Chri5]

See pages 30 / 31 and confirm your happy it's wired per MI's

http://www.ultimatehandyman.org/PDF...tar-27-42-installation-manual-part-1-of-2.pdf

 

[doakster]

See pages 30 / 31 and confirm your happy it's wired per MI's

http://www.ultimatehandyman.org/PDF...installation-manual-part-1-of-2.pdf[/QUOTE]Hi Chris I'm sitting with that manual in front of me the main problem is how I connect (pg 27 8a) at the joint box - I have a 3 core cable coming from the cylinder stat and the zone valve cables.

 

[flameport]

Page 27 is the wrong page - that is for a boiler with a built in diverter valve, which yours cannot have. (if it did, there wouldn't be any external valves)

Look at page 26 instead - it's just a standard S plan system, and the external controls connect as shown in diagram 7.

The link above is the wrong manual as well, that is for the combination boiler.
Correct manual on this page:
http://www.worcester-bosch.co.uk/installer/products/gas-boilers/greenstar-30cdi-system