Honeywell to Hive dual channel

Anna10 · 29 Oct 2017 at 11:27

Hi! I would be grateful for any advice. We used to have Hive single channel system as we had a combi boiler. We had a single channel receiver, Nano hub and the thermostat (the less appealing white one). During the house rebuild, we switched to a (Baxi) boiler with a (Megaflo) hot water tank and wired temporarily a Honeywell ST9400C programmer - wired as shown on the photos here https://ibb.co/chGjy6

and https://ibb.co/mFLSJ6

We do not have any separate (wireless or wired) thermostat for the Honeywell programmer. We have thought about it all and want to reinstall the Hive. We have the hub and the wireless thermostat and I just bought the Hive dual channel receiver. I wonder if we just wire the Hive dual channel (SLR2) receiver in exactly the same fashion as the Honeywell programmer is wired - I wonder if it should be a straight swap? Ideally we would prefer not to order the whole new Hive system as we have all the components, and would prefer to have a go at it ourselves. Thank you all very much in advance!

FlyingFish · 29 Oct 2017 at 12:20

Yes, the 9400 can be used to time your dhw, like it currently does. And the hive can be used to take over the ch. Your wiring indicates a s-plan system so you just need the hive receiver to send a switch LIVE down the ch ON wire, which is the black wire at terminal 4 of the Honeywell backplate. Remove it from the backplate and have the hive receiver do the job, this would be done at the wiring center normally.

Mick

FlyingFish · 29 Oct 2017 at 12:21

Just read you've bought the dual channel, to replace the single. Then should be easy job, I think the only thing you need to be aware of is whether the switching of the hive is volt free or not. An s-plan need 240 down both CH ON & HW ON.

Anna10 · 29 Oct 2017 at 13:56

Thank you. I was just planning to turn everything off in the fuse box, disconnect the five wires from the Honeywell programmer, put the five wires in the relevant places in the Hive dual channel receiver and switch it all back on and see if the nano hub, the thermostat and the receiver connect