Replace thermostat

[Bloodyldr]

Hi,

I'm trying to replace my eberle rtr-e 3521 thermostat with a Secure srt323 (hortzmann Hrt4-b).

My thermostat command a two way valve (open/close) and is connected as follow :

Yellow/green : 2
Brown: 1
Blue: N

How does I have to connect new thermostat ?

Thanks in advance for help.
Bloodyldr

 

[stem]

The RTE-E 3521 thermostat is wired as follows:
Terminal 1 = Live In (Brown)
Terminal 2 = Switched Live (Yellow / Green*)
Terminal N = Neutral (Blue)

The Horstmann HRT4-B is battery operated, so it doesn't require the neutral. Insulate this and tuck it safely out of the way. The remaining wires would then be.
Terminal 1 = Live In (Brown)
Terminal 4 = Switched Live (Yellow / Green*)

*It's not good practice to use a green/yellow earth wire as a 'live' it should at least have a brown sleeve on. Fortunately the HRT4-B is double insulated, but if it wasn't and needed an earth you would have had a problem.

 

[Bloodyldr]

It's working like a charm. Thanks a lot !

 

[JohnD]

Terminal 1 = Live In (Brown)
Terminal 4 = Switched Live (Yellow / Green*)

FFS

Use the Blue for switched live.
Sleeve it with brown at both end
You've got it, so use it.

Not the earthwire.

 

[stem]

He is in Belgium. Maybe it's accepted there.

 

[bernardgreen]

Fortunately the HRT4-B is double insulated, but if it wasn't and needed an earth you would have had a problem.

Using the Earth conduct or for anything other than Earth is not acceptable.

It could be a serious, even fatal, shock when someone works on the installation and assumes the earth conductor is Earth and is unaware it is Switched Live