Greenstar Junior 24i Replacing Thermostat With Nest

[ml68]

Hi,

Is it possible to replace the timer/thermostat below without opening up the boiler?

Thanks

Mick

 

[ianmcd]

Hi Mick, not familiar with that thermostat, do you know if it is a wireless RF stat ? is there a receiver box next to the boiler ?

 

[ianmcd]

If you are not sure remove the front of that thermostat so I can see the wiring and I will tell you

 

[ml68]

I'm fairly certain its wired and I can't see a receiver next to boiler.

 

[ianmcd]

OK do you know if the thermostat has batteries or is it mains powered, if you could remove the front , will be two grooves probably on the underside that you push in with a small screwdiver, sometimes small screws, or if you know the make and model of the thermostat that would do

 

[ml68]

Its mains.

 

[ianmcd]

You only have two wires so that would indicate that it is battery powered but I cant see where the batteries could go unless the display board oulls forward, did you isolate the power before removing the facia ? did the display go blank when you turned the power off ?

 

[stem]

It's a Horstmann DRT2 and is indeed battery powered.

 

[ianmcd]

@stem mike and myself have been chatting on PM and all sorted, good that some people on here actually try to help rather than quote crap

 

[stem]

Having replaced one only recently I recognized it, so it was easy to identify. I deliberately didn't get involved in the wiring as I could see you both had a useful dialogue going already.