Combi boiler

[ed-ectrician]

I'm a bit of a novice when it comes to boilers. I need to wire up a combi so no s or y plan to worry about. It has a faulty external control/programmer. Is it as simple to wire as 3a fused spur to control to boiler flex? Can i use any controller? Which one should i ask for?! Are they easy to wire up? L-n-e in and out? Easy as that?!

Thank you VERY much

Ed

 

[Swicade]

On a Combi boiler you only need to control the central heating as Hot water is on demand.

A single channel programmer achieves this and is usualy connected across 2 terminals in the boiler totaly seperate from the mains in. So you have a mains 3 core supply from a 3A switch fused spur (as i was informed gas safe regs require double pole switching) and a seperate flex to the programmer fed from the boiler (not the sfs).

Quite often around here people use those remote programmable room stats as the programmer.....reciever unit is mounted close to the boiler and wired up and programmable roomstat (which is battery powered) can be anywhere in the house.

 

[ed-ectrician]

Thanks. Any other help from anyone else?

 

[Mark_Burgess]

Thanks. Any other help from anyone else?

Yep, I echo Swicade's post.

 

[ruston]

Same really , I use Grasslin or Honeywell programmers though , if that helps . Piece of cake to do. Geordiespark will tell you all you want to know about boilers for a couple of bottles of brown lol.

 

[Guitarist]

Definitely worth getting the remote style programmer/stat, as Swicade says. Costs a bit more to buy, but great flexibility and a doddle to install the base. Just make sure you get the correct unit for your boiler.

 

[SKY]

Love the honeywell CMT 927 - not the cheapest but very reliable and gives a nice constant temp in the house but ramping down the boiler when nearing temp but not stopping it.

 

[Geordie Spark]

Same really , I use Grasslin or Honeywell programmers though , if that helps . Piece of cake to do. Geordiespark will tell you all you want to know about boilers for a couple of bottles of brown lol.

Aye ..... Aahhv messed aboot wi' a few dodgy boilers in me time, but aahhv gorra Tidy one noo.

 

[sedgy34]

I have fitted lots hard wired and wireless
when the lecky goes off with wireless some people don't know how to sync them back up can be a pain with revisits

 

[mountainman]

Remember to use heat resistant cable inside the boiler.

 

[ed-ectrician]

According to pg8 of this i need a l n and e from dp spur, to controller then l and n to boiler then 2 switched lives from boiler to controller. Where does 3 core come in? Are u saying use all four conductors in threecore cable (sleeved as lives) and run 3 core from boiler to controller then?

Wouldnt that 3(4) core have to be butyl cable or similar?

Bleaurgh

http://www.plumbnation.co.uk/site/h.../honeywell-cmt927-technical-specification.pdf

 

[ed-ectrician]

Forgot my earth. Think i've got it though.

 

[sedgy34]

Wtf
from spur to programmer LNE from programmer to boiler 5 core flex heat resistant from programmer also 3core &earth to statt (simples)

 

[ed-ectrician]

Thanks. But Stat's wireless so not the 3 core to stat?! Sorry to be a dimlo

 

[mountainman]

I think that you would be wise to employ a spark or, heaven forbid, a heating engineer. Imho