Thermostat wiring help please

[gordy87]

Hi all I'm looking at changing my old Drayton mechanical thermostat to a new digital Danfoss one. I'm a bit unsure of the wiring though and would really appreciate some advice on where the wires should go on the new thermostat.

The new thermostat is mains operated as apposed to battery.

The boiler is a combi boiler.

Below are some pics of the old and new thermostats

Thanks for any help

 

[Echo the husky]

You will need to fit a surface, or flushed in box before wiring the thermostat. This thermostat may be designed to have a permanent supply, rather than being fed from a time clock, so it may or may not work properly when connected to your existing wiring. There is a way around it but it is a bit involved requiring a small relay.

Blue-N
Red-L
Yellow with red sleeve-NO
wire link from L-COM

 

[gordy87]

Thanks husky. I have a flush box waiting, just didn't want to cut the plasterboard until I'd found out if this type of thermostat would work.

Is there any way to find out if this will need a relay or just fit it and see what happens?

By the 'wire link' do you just mean a scrap bit of wire connecting the L to COM?

Thanks for the help

 

[Echo the husky]

Yes just an odd bit of insulated wire will do for the link. Just fit it and see if it works, some don't like the supply being cut every time the time clock goes off. Others don't care. There is no mention in the installation manual.

 

[gordy87]

Brilliant thanks again for the help. I'll update when I see if it's working.

 

[gordy87]

Thermostat works when timer kicks on. When timer kicks off thermostat power disappeared but when timer comes back on thermostat has stayed at the temperature I set it at and not reset. So this should work fine? Will see how it goes over the next couple of days.

 

[Echo the husky]

Should be fine!

 

[gordy87]

Thanks again for the help!