Changing Mains op Thermostat to Digistat3 Help

[ian283]

Hi There,

I have a combi boiler that the central heating is on and we control by adjusting a room thermostat. An ACL.

In tkaing the cover off I notice that it has Live -Netral - Earth and the thermostat creates the circut when the temp drops. I am looking to change this to a Thermostat and Timer combined.

I purchased a Drayton Digistat+3 22083 - this is battery / mains. I need to understand which connector takes The L- N and then the E.

I have a C On and Off. No Earth

Will this unit work with this set up. If not What do you suggest.

Yes the boiler does have a control panel but is not easy to use.

Thanks

Ian

 

[twgas]

Are you sure your existing room 'stat has live, neutral and earth?
There must be a switched live going back to the boiler.

 

[D_Hailsham]

1. What is the make and model no of your old thermostat?

2. Which wire goes to which terminal?

 

[ian283]

Hi There,

Thanks for the replies.
I noticed a similar //www.diynot.com/forums/viewtopic.php?t=256353 post but very confused over the contradicting answers.

I have a Biasi Riva M 11032SM/C Combi.

Not sure how it's wired at boiler end. Will have to take panel off to discover.

I am attaching some photo's of the current wiring and the new unit.

Drayton Digistat+3

• ian283
• 3 Jan 2011
• 1

Drayton Digistat+3

ACL Thermostat

• ian283
• 3 Jan 2011
• 1

ACL Thermostat Wiring (Cover off!)

[/img]

 

[D_Hailsham]

ACL Thermostat

• ian283
• 3 Jan 2011
• 1

ACL Thermostat Wiring (Cover off!)

For once the green/yellow wire is actually being used as an earth!

Is there a wire connected to the bottom terminal?

 

[ian283]

Old Thermostat ACL (it loks like Drayton bought ACL?)

Here is the wiring from the boiler.

Biasi M11032SM/C Wiring

• ian283
• 3 Jan 2011
• 1

Wiring for Biasi Combi Boiler Control

It look like the cable does not have earth fitted to the control yet the control has an earth. If it goes anywhere!?

[/img]

 

[ian283]

ACL Thermostat

• ian283
• 3 Jan 2011
• 1

ACL Thermostat Wiring (Cover off!)

For once the green/yellow wire is actually being used as an earth!

Is there a wire connected to the bottom terminal?

Hi No wire connected on the bottom terminal

 

[D_Hailsham]

No wire connected on the bottom terminal

In that case, the wiring of the new stat is simple

Connect the brown wire to C terminal
Connect Blue wire to ON terminal (this wire should have a red sleeve as it is the switched live)
The green/yellow wire is not used and should be made safe - e.g. cut back to outer cover.

 

[ian283]

Thank You D_Hailsham.

That's great. I suspected this might be the case but didn't want to fry myself, the boiler or the new stat!!

 

[abrad]

No wire connected on the bottom terminal

In that case, the wiring of the new stat is simple

Connect the brown wire to C terminal
Connect Blue wire to ON terminal (this wire should have a red sleeve as it is the switched live)
The green/yellow wire is not used and should be made safe - e.g. cut back to outer cover.

Hi, this post covers what i am trying to do with what looks like the same original thermostat. However in my case the second wire is yellow (with red sleeve) and the bottom terminal has a blue wire connected to it.

in this case where would the blue wire go to on the new Drayton Digistat+3 terminals?

Thanks, Andy

 

[D_Hailsham]

where would the blue wire go to on the new Drayton Digistat+3 terminals?

The blue wire is not used; make it safe, e.g connect to a terminal block hidden behind the wall.

 

[abrad]

Great, thanks for the reply!!