Need help wiring a new digital thermostat

[marc1977]

Hi,

I am replacing an old honeywell room thermostat with a programmable digital Drayton one but cant work out what wires go where.

below is a diagram of the current wiring - i have 3 cables in positions 1,2 & 4

Untitled

• marc1977
• 31 Dec 2010
• 2

The new stat has 3 connection points - C, ON & OFF - here is a link to the installation guide - http://www.draytoncontrols.co.uk/WorkArea/DownloadAsset.aspx?id=10384.

I thought it would be C = 1 (which should be live), ON = 3 (which is a switch i think) and OFF = 2 (which i think is neutral). However I tried this and the fuse blows?

Thanks

Marc

 

[twgas]

Starting a new thread will not resolve your problem any quicker, on the contrary, helpers may get confused and not bother posting.
You are wrong in your thinking, about the wiring, C is the supply to the 'Stat, ON is supply back to boiler (combi) or valve (heat only blr),
Off would be to a MOMO valve, not usually reqd.

 

[misterdubya]

Its a 'one in one out'. You dont need a neutral.
Mr. W.

 

[doitall]

Why start another thread. unless you don't believe my last answer.

The brown goes to the C, and the earth goes to the ON and should have a red sleeve on it.

The blue neutral needs to be made safe with a connector block, and not connected to anything.

That's it two wires only required.

 

[doitall]

Its a 'one in one out'. You dont need a neutral.
Mr. W.

edited misterdubya edited his post

But just to make it clear.

1 = com

3 = ON

2 = is not used.

 

[denso13]

Use the brown and blue and terminate the earth wire. The earth should not be used as a live conductor.

 

[doitall]

Use the brown and blue and terminate the earth wire. The earth should not be used as a live conductor.

That would mean altering it at source, e.g.boiler.

But I do agree it would be better.

 

[misterdubya]

Use the brown and blue and terminate the earth wire. The earth should not be used as a live conductor.

The blue is a neutral, or am I still too drunk to follow this thread?

Just seen DOI's reply Better idea.

Better bu@@er off,

Mr. W.

 

[doitall]

Use the brown and blue and terminate the earth wire. The earth should not be used as a live conductor.

The blue is a neutral, or am I still too drunk to follow this thread?

Yes do try and keep up

denso is advising the OP to change the blue over in the boiler and using it instead of the earth wire

 

[marc1977]

ok thanks all. it doesnt work. perhaps the thermostat is broken...

 

[doitall]

ok thanks all. it doesnt work. perhaps the thermostat is broken...

How have you wired it now. a pic perhaps.

 

[twgas]

ok thanks all. it doesnt work. perhaps the thermostat is broken...

you may have fried something if you powered it up with a "neutral", there would be a 'straight short killing something'

 

[misterdubya]

What amperage of fuse did it blow?

Mr. W.

 

[marc1977]

it does not blow any fuses wired as above. the boiler does not come on though

 

[D_Hailsham]

Starting a new thread will not resolve your problem any quicker, on the contrary, helpers may get confused and not bother posting.

The OP is also running the same problem, twice, on another Forum. That means he has asked it four times in all.

Let him stew.