Wiring new electric boiler to hive

[Frasers]

Hello. Bought a Electric Heating Company comet pv version one which is rated 2kw to 8kw.

I want to connect a hive thermostat to it. The boiler circulates for heating only and unfortunately I’ve bought the two channel version of hive.

Can anyone suggest how to wire it up so I can control the central heating? Thanks

 

[CountryFan]

Looking quickly at the boiler, it suggests it’s a system boiler, is that correct? You either need to wire the Hive into the wiring center or directly to the boiler. Could do with a little more info

 

[Frasers]

Thanks for your reply. I have attached a picture of the wiring diagram. I understand that there should be a connection into the RT points but have been advised that no voltage should be fed into those so wondering how the Hive 2 channel would be wired up. Yea it’s a system boiler. I only have a feed in loop plus flow and return around the radiators.

 

[CountryFan]

Who advised against voltage? Basically I can deduce from that wiring diagram is the RT is volt free, which usually means any voltage can be applied, voltage isn’t supplied from them. You could do with knowing if 230vac can be applied (afaik it can) and work out which is switch live. So you have no motorised valves?

 

[Frasers]

It was the guy at the company who sold the boiler. There is also a note on the diagram saying several input ports including RT are volt free. Yea, no motorised valves. So how would you suggest wiring the hive receiver into the boiler. I was going to tak the neutral and live from the receiver and connect into the main supply at the boiler then I was thinking the two ports on hive for central heating on and off into the RT? Do you think that would work? Is there voltage on those hive ports? Thanks again

 

[RandomGrinch]

Basically I can deduce from that wiring diagram is the RT is volt free, which usually means any voltage can be applied, voltage isn’t supplied from them

I'm afraid not - volt free switching means that the contacts of the switch are free from any voltage supplied to power the switching device. I.e. the single channel Hive is volt free switching - the dual channel is not.
The voltage, whether extra low voltage, or mains, is supplied exclusively from the boiler. Given that the RT terminals are on a different terminal block to the mains voltage terminals, it is a safe assumption that RT is an extra low voltage terminal.

how the Hive 2 channel would be wired up.

Basically, swap it for a single channel Hive, unless you wish to start complicating the circuit with extra relays.

 

[Frasers]

Might well just swap it then for a single channel hive. How will that be wired up then?

 

[RandomGrinch]

Might well just swap it then for a single channel hive. How will that be wired up then?

Find a N, L and an E from the boiler to power the Hive.
Then connect terminal 1 of the single channel Hive backplate to one of the RT terminals.
Connect terminal 3 of the Hive to the other RT terminal.
You could use a 5 core flex to connect the two, or two separate cables, one for the power and one for the RT connections.

Is there voltage on those hive ports?

Yes, the dual channel Hive has mains voltage output on its terminals - not a good idea to connect to extra low voltage terminals!

 

[Frasers]

Thanks. You’ve been a great help! Cheers