Hive dual channel on a combi boiler

GeX

GeX

GeX

Soldato
Joined
17 Dec 2002
Posts
6,930
Location
Manchester
Hi.

I have a Hive Dual channel receiver that I'd like to install on SIME Friendly Format 100E combi boiler.

Boiler manual;

http://library.plumbase.co.uk/flipbooks/RE/simefrif100e_22917_t/simefrif100e_22917_t.html

Wiring diagrams;

https://imgur.com/a/WjWzr

QJvGTw2l.jpg

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The manual says that if a room thermostat is to be used I need to remove the bridge from terminals 22 & 23 (connector TA). It says it should class II EN 60730.1 (clean contact).

My intention is to use this connection, and just leave the inbuilt timer set to 'ON'.

I've interpreted the wiring diagram to mean that 22 is common and 23 is what needs a connection to request heat.

Switching 230v for the thermostat seems wrong to me, but that's what is usual on heating systems isn't it?

So my plan is to remove the 22 & 23 bridge from TA, leave 22 unconnected and then connect terminal 4 from the Hive to terminal 23. This way, when the Hive requests heat it will connect live to pin 23 on the boiler.

Does that seem correct?
 
Thanks for the confirmation :-)

It is an old boiler, and it seems that lower voltage switching is only on newer boilers.

I will double check 22 to confirm that it is providing 230V (would testing to earth not trip the RCD?).
 
I removed the link and checked 22 against the handy N that was close by, no voltage there. But 23 was showing mains voltage, so this should be fine to connect terminal 4 on the Hive to 22 on the boiler.
 
Just in case anyone finds this whilst searching (I didn't find much), it is all working fine.

Removed link, connected terminal 4 on the Hive to 22 on the boiler.

The_One said:
why did you buy a hive dual channel for a combi
Click to expand...

Prime Day, and there was no stock showing of the single channel.
 
You need to check the wiring diagrams for the boiler / thermostat. Does it switch using mains voltage? A quick Google suggests it does. If this is correct then you can use the dual channel. Is the thermostat mains powered? In short, power the receiver off that and connect terminal 4 of the Hive to the line that currently goes to the boiler.
 
Connecting 4 (Heating on) to bk1 on the boiler *should* work, but it does say in the manual

NOTE: The 230V switched signal for external controls (Frost Stat - Room Stat - Timer) must always be taken from terminal 2 at the boiler. Live, Neutral and Earth to power these controls must be taken from the Fused Spur.
Click to expand...

This sounds like it's just saying that you should not try and power the external controls from the bk2 - fine. Not sure why it says the 230v signal must be taken from bk1 (implies it can't be an external source ie the Hive receiver)
 
I would assume COM is connected to bk2 on the boiler and just provides 230v to switch back into bk1 to call for heat. As the 230v signal will come from the Hive then you don't need the COM connection. As I say though, I can't see any reason why you have to use the signal from the boiler other than to ensure that when you isolate the boiler there is no chance of any of it being live (ie with 230v from Hive).

I am not an electrician or work with any kind of boiler installation things.
 
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