Installing Hive 2 - need advice on removing wired thermostat

what plan do you have? i.e s plan, y-plan. from the looks of the programmer wiring you have a y-plan unless the hot water valve is motor open-motor closed and not a spring return valve.

if my assumptions correct then number 4 red in programmer goes to old thermostat terminal A, terminal B yellow goes to the white of the mid position valve and blue terminal c is neutral. you could join the red and yellow together in the thermostat.....imo that's a bit rough and would be better to disconnect the room thermostat cable from the wiring centre and connect the white of the valve to the CH on terminal on the hive.

 

do you have two valves i.e one for hot water and the other for heating or do you have one valve which is usually referred to as a mid position valve or 3port valve?

 

The colors aren't corresponding to the numbers as shown in the pic.

 

Never installed one, but looks like the default setting is for fully pumped system, you may have to reset it to gravity fed mode.

 

Terminal B in old thermostat (yellow) will be connected to the white of the mid position valve, Terminal A (red) will be connected to CH ON (terminal 4) in old programmer and terminal C (blue) in old thermostat will be commoned with the rest of the neutrals. disconnect all 3 Red, yellow and blue plus the CPC (earth) in the wiring centre and connect the white from the valve to the CH ON terminal in new programmer.

 

I've wrote next to each one what they are.

 

Easiest way to install this would be to replace the existing programmer with the dual channel receiver, and the only bit of wiring you have to change is by disconnecting the thermostat cable as described above and connect the white of the mid position valve to the CH on terminal on the dual channel receiver.

 

For a 3 port valve to work the hive has to have a hot water "off" terminal, does it have that.

You also need to find the wiring centre and connect out the thermostat wiring there, I doubt it goes back to the programmer. Or alternatively connect the red and yellow wires together at the old stat position.

I cant quite fathom why the blue is in terminal C in the old stat, looking at the diagram inside the cover it looks like a "satisfied" live terminal but this would obviously short out when it got up to temperature so it must just be a parking terminal for the not needed neutral.

 

https://www.hivehome.com/hive-self-install


the dual channel receiver has HW OFF.

 

on that particular valve it will be brown or white with a brown stripe if you don't have a plain white core.

 

So it has, it wouldn't surprise me in the least though if it was an oversight by the manufacturers.

 

Just to clarify does this mean that the hive is up an running, and you are only seeking advice on what to do with the now redundant thermostat wire.

If so the the instructions mention that it can be disconnected at the hive, and or carefully terminated into a terminal block enclosed in suitable enclosure.

 

thanks for coming back and letting us know did you end up disconnecting the old thermostat or joining it through?