Hive to potterton heatmax combi he

[floater123]

Hi I am new to the forum, so bear with me if I don't get things quite right.
I have the above boiler, that's attached to a Centaurplus C21 programmer and a Honeywell temperature gauge. I wish to take these out of the heating system and replace them with the Hive. I am no electrical expert, but could somebody tell me which cables from the boiler I connect to the hive receiver and into which connections

 

[Stuckinarut]

Are you sure it's definitely a combi boiler? A C21 is a 2 channel programmer for heating and hot water.

 

[floater123]

It’s definitely a combi boiler. The confusion my be due to the fact that we replaced the original boiler that had a tank connected with it, with the above combi boiler, but continued to use this programmer for heating but not for hot water as we were getting it on demand through the taps

 

[Stuckinarut]

It’s definitely a combi boiler.

Ok, might be best to just rip out the C21 and Honeywell stat altogether, get some 5 core heat resistant flexible cable and do it from the boiler. Piggyback the LNE and then take the other 2 wires from the connections to the left of the earth wire (1 is currently the switch live) and put them to the com and NO at the Hive. Hope this makes sense?

 

[RandomGrinch]

The existing wiring is a little bit of a mash up at the moment.
What you do next depends on what you want to achieve.

The simplest thing to do (assuming a single channel Hive) would be to remove and isolate the black wire in terminal 3 of the Centaur plus.
Move the Grey wire in terminal 4 to terminal 3.
Add a short link wire between L and terminal 1.
Mount the Hive on the existing backplate.
And turn the Honeywell stat to maximum.

Removing the existing stat and wiring would be possible, but is a more involved process.

Edit, or as above, start from scratch!

 

[floater123]

Thanks RandomGrinch for your suggestion. That is something I will keep in mind, but my preferred option would be to removed both stat an programmer and have the hive on the wall in their place, and to have the receiver in the loft near the boiler. Do you have a wiring suggestion for that option. I really appreciate using your time to help me

 

[floater123]

Thanks Stuckinarut. I think I will use your suggestion and rip out the stat and programmer and start again straight from the boiler. I will let you know how it goes when I have got some cable.

 

[RandomGrinch]

I think I will use your suggestion and rip out the stat and programmer and start again straight from the boiler.

If possible, if you remove the stat and programmer, try and also pull out the flex.
It gets a little bit problematic with wiring regs, leaving cables buried in walls!
You may also get a decent amount of 4 or 5 core flex, that will enable you to wire in the Hive.

 

[floater123]

I have employed the Stuckinarut suggestion and ripped out the programer and stat and wired the Hive up as described direct from the boiler.
I have also used RamdonGrinch's suggestion and removed all cable associated with these pieces of equipment.
The result is an up and running Hive. I had to contact Hive customer services to get the thermostst to connect, but that was a hive problem.
I cannot thank you both enough for the help you have given me.
thank you

 

[Stuckinarut]

I have employed the Stuckinarut suggestion and ripped out the programer and stat and wired the Hive up as described direct from the boiler.
I have also used RamdonGrinch's suggestion and removed all cable associated with these pieces of equipment.
The result is an up and running Hive. I had to contact Hive customer services to get the thermostst to connect, but that was a hive problem.
I cannot thank you both enough for the help you have given me.
thank you

Not a problem, and glad you’re sorted!