Honeywell T6360B to Honeywell DT4

[inthemix]

Hello I am trying to replace Honeywell T6360B with Honeywell DT4.

I have a combi boiler.

Please may I know if the Blue wire will have to be made safe before connecting the Red to A and Yellow to B? And presumably the earth wire is not required for DT4?

 

[ericmark]

Please may I know if the Blue wire will have to be made safe before connecting the Red to A and Yellow to B?

Yes, not required, looking at your diagram, but when I google DT4 I get which shows it will need neutral. I seem to remember there was a DT4 thermostat looking some thing like this which would be wired like you show, seems the name has been reused, so rather weary of giving an answer in case not what I think it is. This I think is the old DT4 which is two wire only.

 

[inthemix]

Yes, not required, looking at your diagram, but when I google DT4 I get View attachment 361137 which shows it will need neutral. I seem to remember there was a DT4 thermostat looking some thing like this View attachment 361139which would be wired like you show, seems the name has been reused, so rather weary of giving an answer in case not what I think it is. This View attachment 361140 I think is the old DT4 which is two wire only.

Thank you for your prompt reply.

This is the the DT4.

 

[stem]

Hello I am trying to replace Honeywell T6360B with Honeywell DT4.

I have a combi boiler.

Please may I know if the Blue wire will have to be made safe before connecting the Red to A and Yellow to B? And presumably the earth wire is not required for DT4?

All sounds good to me

The thermostat is just an on/off switch. The switch is shown in the cover diagram with the wires connected to terminals 1 (in your case red) & 3 (in your case yellow)

For the new thermostat, the switch is also shown in the diagram, so the wires go to the corresponding terminals that have exactly the same function A (red) and B (yellow) as you have figured.

The original thermostat required a 230V supply to work properly, hence the neutral. The new thermostat is battery operated so doesn't need it. So yes, isolate it and make it safe. Same with the earth.

 

[inthemix]

Thank you very much.

It’s all singing and dancing!