help with unvented cylinder, cobi with dual channel hive

cm electical said:

but that came as akit from plumbers merchants, but it wouldnt matter what boiler it was terminal 15 would never go to boiler would it, so the diagram is crap anyways for any wiring

Click to expand...

davesparks said:

As I have said already terminal 15 is a switched live to the boiler.

That diagram is not crap, it clearly shows how the system should be connected if it is being installed in the way the manufacturer has designed it to be installed. And shows how it would connect to the basic version of the components which are not supplied by the manufacturer.

The electrician connecting the controls is expected to have the knowledge and skills to read that diagram, and the relevant diagrams for the boiler and anything else and use that information to connect the system up in a way that satisfies the requirements of all the parts of the system and current legislation.

Click to expand...

cm electical said:

so if this was you doing this job how would you alter it to make it work on a hive setup?

Click to expand...

cm electical said:

yes but the diagram doesnt show the perm liveinto the boiler at all.
so they wire my diagram is would it work or not? the one ive altered.

Click to expand...

davesparks said:

I'd remove the connector strips from that terminal box and connect it up as a standard S plan system using wago connectors.
I'd probably feed the boiler directly from the sfcu and take a 4 core flex (L, N, S/L and E) from the boiler to the terminal box using terminal 2 to feed the external controls.

Click to expand...

cm electical said:

so from terminal 2 (switch live out) in boiler where would you take it to on wiring centre.

Click to expand...

cm electical said:

does that mean terminal 1 (switch live in) in boiler you would not need to connect a wire..

Click to expand...

cm electical said:

i thought the brown in the zone valves where perm lives but looks as if its the grey wires thats perm lives.

Click to expand...

davesparks said:

I'm sure I've mentioned this already but terminal 2 is the 230V feed to the external controls.
Terminal 2 at the boiler is the live supply to the external controls.
I don't know how I can make this much clearer.


Terminal 1 is switch live in, exactly what you have just written.
Again I don't really know how to make this more clear without being completely patronising.



Brown and blue are the motor, grey and orange are the microswitch.

Click to expand...

cm electical said:

its just a head scratcher for me this one its been 15 year since i done this setup but without using a hive.

Click to expand...

UNG said:

Not sure why this should be a such head scrataher when you can pick virtually any "S" plan diagram and substitute the the dual channel programmer with the dual channel hive

Click to expand...

UNG said:

Not sure why this should be a such head scrataher when you can pick virtually any "S" plan diagram and substitute the the dual channel programmer with the dual channel hive

Click to expand...

UNG said:

Not sure why this should be a such head scrataher when you can pick virtually any "S" plan diagram and substitute the the dual channel programmer with the dual channel hive

Click to expand...

cm electical said:

so at the boiler not cable goes into terminal 1, switched live in???

Click to expand...

davesparks said:

As I have already said
The feed from the switchfuse goes to the boiler, only the boiler, nothing else.

Terminal 2 from the boiler is the 230V feed out to the external controls. Terminal 2 supplies power to the external controls.

Terminal 1 at the boiler is the switch live in.

There is more than one way of connecting this system but the following will work.

Run 3 core flex from switchfuse to boiler.
Connect the brown to L, the blue to N and the earth to earth.
Do not connect anything else to the supply from the switchfuse.

Using the 5 core flex you have already run from boiler to terminal box.
Connect blue to N and earth to earth at both ends.
Connect brown to boiler terminal 2 and the live supply of the controls terminal box.
Sleeve the black with brown sleeving at both ends, connect it to terminal 1 at the boiler and the boiler switched live at the controls terminal box.
Make the grey safe at both ends.

Click to expand...