Upgrading Wirsbo Cosy stats to programmable stats

[Brix]

I have two UFH systems in my home. One in the main house and one in the granny flat. The granny flat has 5no. zones with a timer on the combi and Wirsbo Cosy stats in each room. This is 3 wire 24V I think. I'd like to upgrade room stats to programmable stats. 

 

Upstairs each room / zone is operated on a 2 wire 240V Danfoss TP5000Si. I'd like to use something similar in the flat for continuity. Can I use the TP5000M 24 Si. Would it be a straighforward switch? Any other suggestion?

Edited October 12, 2020 by Brix

[Temp]

I've had a quick look at the wiring diagram for "a" Wirsbo Cosy 24V stat...

 

https://www.uponor.co.uk/-/media/country-specific/uk/download-centre/support/manuals/legacy/cosywirsbo/cosy-wired-manual.pdf?la=en-gb&hash=B38C92FA92FB3D52591E387F7F3D06AC2A380540

 

and the Danfos TP5000M 24 Si.

 

https://assets.danfoss.com/documents/DOC041186407154/DOC041186407154.pdf

 

I think you would need a wire link in the TP5000Si but otherwise I reckon they could be used to replace the Wirsbo Cosy stats.

 

I believe the existing stat has..

 

Terminal 2 → Phase 24V 

Terminal 3 → Switched phase
Terminal 4 → Neutral 24V

 

The TP5000M 24 Si has..

 

A → 0V 

B  → 24V 

and relay contacts..

1 → OFF

2 → Com

3 → ON

 

So I think the wiring would be...

 

Wire                                           TP5000M 24 Si Contacts

Phase 24V --------------------------- B and 2 (eg using wire link)

Switched Phase ------------------- 3

Neutral 24V -------------------------- A

 

I recommend taking a photo of the back of an existing stat before disconnecting any wires. 

 

Oh and turning off power to the whole system but that's obvious.

Edited October 12, 2020 by Temp

[Brix]

Thanks Temp. Was anticipating more of a yeah that'll work kind of answer. Super helpful and much appreciated!