Vokera 25 he

[martin b]

Hi all
Can anyone suggest a two channel controller that i can use with a vokera 25 he combi and an unvented cylinder. at present the heating and hot water have to be on together. the hot water from the combi is blocked off and its set up as a system boiler. there are 2 two port valves fitted but i want to start again with the wiring. The boiler needs volt free switching but i need a switched live to operate the valves.

 

[Ermintrude]

If you are not competent you shouldn't be messing with that unvented as if you mess up the wiring your going to blow up your house . Require a G3 qualified to mess with safety devices on an unvented ....... The two port is the first safety device on the unvented chain of protection. It's very simple tho .

 

[lame plumber]

why havent you left the combi on one tap only ie kitchen waste of a bit of kit not too. re setting up a s plan, its simple and any qualified techie should know the ropes as they should be able to wire in a standard 2 channel programmer. Having said that, the idiot I followed on after last Sunday could spot a badly wired s plan either!!

 

[martin b]

Ive got g3, youve both missed the point.

 

[Dotty]

Any controller will do. Look at an s plan wiring diagram, you'll see why.

 

[Ermintrude]

Use 240v from controller to open close valves and the. The microswitch contacts to operate boiler volt free. It's just like how u wire ufh to a combi.

 

[lame plumber]

safer to wire the lot as 240v rather than mixing it with volt free if the bod on the end of the screw driver isnt sure, saves a new pcb 🙂

 

[martin b]

Are you talking about the microswitch contacts in the valve?

 

[lame plumber]

thought you were g3 and knew it, you are missing something here 🙂