Replacing mechanical stat with wireless programmable stat

dd2005 · 9 May 2011

Can I simply replace my mechanical stat with a wireless stat? Dont want to touch the boiler so was planning on installing the receiver where the existing stat is. Question is can I do this as my existing stat only has 3 wires (as follows) and the wireless receiver needs 4 wires! Is it possible to use the one live wire from the old stat to feed the 2 live contacts on the new receiver?

Old - New

Live - Live and common
Switched live - Call for heat
Neutral - Neutral

If I cannot do this I will simply use a wired programmable stat. Any advice gratefully received.

Netdragon · 9 May 2011

Wireless stats need a perm live, only way is to remove the timer at the boiler and install a wireless timer/room stat system and make the common/live perm.
and add a link from perm live to common on the new stat.

Also not all stats run on 230v it could be a low voltage version mechanical stat.

bengasman · 9 May 2011

There really is no point in putting the base unit where the current stat is.
What boiler?

dd2005 · 9 May 2011

The plan is to set the existing timer to permanently on, therefore the live from the boiler will be permanent. Therefore can I connect my "live" wire to both the permanent live and common on the new receiver?

The boiler is a Ferroli Falcon with a round digital 24hr programmer.

Thanks.

bengasman · 9 May 2011

Stick the base unit next to the boiler, high up if possible.
Run a twin cable ( NOT twin and earth ) from the boiler roomstat connection to the switch connection of the new unit, plus a twin to provide 230V from the same 3A spur that feeds the boiler.
Job done, Bob's your uncle.

doitall · 9 May 2011

Which model Falcon.

Most use volts free, stick 240v on it and fry the board.

bengasman · 9 May 2011

doitall said:
...Most use volts free, stick 240v on it and fry the board.

True as that may be, it doesn't matter if you connect it ( correctly ) as I said. By using a twin cable, you just connect the "switch contacts".

doitall · 9 May 2011

bengasman said:
doitall said:

...Most use volts free, stick 240v on it and fry the board.

Click to expand...

True as that may be, it doesn't matter if you connect it ( correctly ) as I said. By using a twin cable, you just connect the "switch contacts".

True but you'll still need 240v on the other side.

I was making the OP aware of the fact.

bengasman · 9 May 2011

doitall said:
True but you'll still need 240v on the other side.

Hence my recommendation of 2 twin cables in stead of multicore; you got to be a real muppet to get it wrong that way.
But then again......

dd2005 · 9 May 2011

Thanks for the help.

bengasman · 9 May 2011

Forgot to mention: technically speaking, this job would need certification by a registered electrician or lbo.
There are rumours that some people have not bothered getting electrical work certified; shocking really.

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Replacing mechanical stat with wireless programmable stat

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