help with unvented cylinder, cobi with dual channel hive

davesparks · Nov 13, 2022

cm electical said:
so what goes to 3 and 4 in the hive

The Hive replaces the programmer.
Terminal 3 is DHW on and terminal 4 is CH on.

cm electical · Nov 13, 2022

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.

cm electical · Nov 13, 2022

davesparks said:
The Hive replaces the programmer.
Terminal 3 is DHW on and terminal 4 is CH on.

this is last post im sick now, this has to be correct?

UNG · Nov 13, 2022

cm electical said:
this is last post im sick now, this has to be correct?

No you have terminal 2 on the boiler linked to terminal 1 in the wiring centre which is unnecessary

davesparks · Nov 13, 2022

UNG said:
No you have terminal 2 on the boiler linked to terminal 1 in the wiring centre which is unnecessary

Yes it is, otherwise the wiring centre won't have a permanent live for the valves.

cm electical · Nov 13, 2022

davesparks said:
The Hive replaces the programmer.
Terminal 3 is DHW on and terminal 4 is CH on.

finished

cm electical · Nov 13, 2022

davesparks said:
Yes it is, otherwise the wiring centre won't have a permanent live for the valves.

that 1 has to be correct now

cm electical · Nov 13, 2022

davesparks said:
Yes it is, otherwise the wiring centre won't have a permanent live for the valves.

so if i just double up the zone valves 1 and 2 it will be ok, as im only using 1 zone, plumber must of just got the kit like this and left it like it is, or does it need changing

UNG · Nov 13, 2022

davesparks said:
Yes it is, otherwise the wiring centre won't have a permanent live for the valves.

Given that the diagram still shows the live feed from the spur to terminal 1 of the wiring centre it isn't needed

In fact the boiler may be fed from terminals 1 & 2 in the wiring centre as in the diagram posted at #26 by the OP

davesparks · Nov 13, 2022

UNG said:
Given that the diagram still shows the live feed from the spur to terminal 1 of the wiring centre it isn't needed

In fact the boiler may be fed from terminals 1 & 2 in the wiring centre as in the diagram posted at #26 by the OP

No it can't, the instructions on the boiler clearly state that external controls must be fed from terminal 2 at the boiler.
This kind of setup is common with a few boiler manufacturers these days.