Replacing TimeGuard TRT035 Thermostat with Hive

[PETRU HOTEA]

Hi,

I've just got a new Hive thermostat from ScrewFix without installation option, I took off my old thermostat and my diagram wiring is not the same like on Hive...I have no idea how to install the wires...
I've attached some pics...

My old thermostat TimeGuard TRT035 (boiler is Baxi Duo Tec Combo 24 HE A) diagram wiring:

Hive diagram wiring :

Can someone help me please ?

Thank you

 

[stem]

The wire in the 'com' terminal of your existing thermostat would go to the Hive 'common' terminal (1)

The wire in the 'on' terminal of your existing thermostat goes to the Hive 'heating on' terminal (3)

In addition, the Hive also needs a 230V mains supply to power it. This is connected to its N & L terminals. Your existing thermostat doesn't need this, so it's not present now and will need to be added. It should come from the same 3A N & L supply as the boiler.

 

[PETRU HOTEA]

Thanks a lot

 

[ban-all-sheds]

How will you get L&N to the Hive?

 

[AndyPRK]

there is a spare wire present which could be used as N
You can probably join L and COM together at the hive (I assume the hive has timed settings to turn CH on and off)


or if the hive unit in question is just a receiver with no inbuilt temp sensor, you could fit it near the boiler wiring center

 

[PETRU HOTEA]

That is what I'm intending to do...
Use the grey wire for N and make a link between Com(brown wire)and L on Hive
Hopefully that's works

Thank you again for help

 

[flameport]

You can probably join L and COM together

Depends on the boiler and how it's wired.

Use the grey wire for N and make a link between Com(brown wire)and L on Hive
Hopefully that's works

If not, then your boiler PCB will be destroyed, and it will cost £100s to repair.

The proper answer is this:

or if the hive unit in question is just a receiver with no inbuilt temp sensor, you could fit it near the boiler wiring center

Guessing and hoping with electrical systems is a sure route to expensive failures.

 

[stem]

I agree! Which was why I described installing it the way I did, 4 separate connections without a link. That way, it will work regardless of whether your boiler uses 24v or 230v for its switching circuits.