Help ! Changing Old Thermostat To New Digital

[Ryan Crowley]

Hi All

I am trying to replace my old thermostat (make Towerstat to a new Digital One c07.

On my old wiring it has numbers for the wire 1,2,3,4

1 goes to Red (live)

2. goes to yellow

3. goes to a cooper wire

4. goes to blue (Neutral

On the new thermostat i have N1 N L L1 & T1 & T2

I have attached the Red to L & the Blue to N & the Yellow and cooper i just attached to terminal blocks.

This does not work although all lights up no heating will come on so i am obviously doing something wrong

Any suggestions ?

 

[ProDave]

you need to attach the yellow to either T1 or T2. Try T1 first, if that doesn't work try T2

Leave the bare copper wire (earth) in a terminal block unless the new thermostat has an earth terminal.

 

[Ryan Crowley]

Still nothing, i wired the old one back in with the dial boiler sparked up straight away

Hi , should i join 2 wires to the Yellow wire and connect to the T1 & t2 would that make a difference ?

 

[NozSpark]

From what I can tell that is a thermostat for underfloor electric heating

Is it this one

http://wholesaler.alibaba.com/product-detail/Touch-screen-floor-heating-thermostat-C07_383157751.html

It might work for you boiler

Try connecting the yellow wire to L1

Then you'll need to go into the thermostats settings to tell it to use the AIR temperature sensor rather than the UNDER FLOOR sensor

 

[Ryan Crowley]

Just changed the yellow to L1 and the Boiler kicked into life so looks ok so far.

Yes thats the one, are you going to tell me its now rubbish lol !!!

 

[NozSpark]

Wellllllll........ It's not really mean't for connection to a boiler

 

[Ryan Crowley]

Also the sensor wires with it which connect to t1 and t2 is it worth having them connected ?

this is the one i purchased

http://www.ebay.co.uk/itm/151915668919?_trksid=p2057872.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT

they sold it on this description so thought it was ok for boiler should i replace in your opinion ?

Description:

    This Weekly Programmable Heating Thermostat with Touch Screen for underfloor heating system can loop on every week every day.It has the high reliability and powerful anti-jamming. The application is heating equipment: Water heating system or electric heating or actuator control.

 

[NozSpark]

The sensor that they've supplied with it is an underfloor sensor, so I wouldn't connect it..

Just make sure that you have it set to AIR and it should be ok...... I've only ever used one of these type of thermostat with the floor sensor to control under floor heating

 

[Ryan Crowley]

Just checking sorry is it dangerous for me to connect in any way ?

 

[NozSpark]

Just checking sorry is it dangerous for me to connect in any way ?

Now you're opening a can of worms.....

In it's self the thermostat does look like it's capable of being used in the method that you are using it

But we would look at it in a different way than you would,,,, such as...

Is it connected correctly, without any bare copper showing, without trapping any of the wires and the circuit was safe and compliant with the regulations at the time it was installed (some basic testing should be carried out to confirm this) then it's possible that it is safe

 

[Ryan Crowley]

Thank you for all your help

 

[Lurch]

I've just fitted 17 of these on one job (custom control system, all 24V). They're OK for multi room control but for a single room thermostat I still don't think you can beat the Salus programmable stats. I would not like to connect some of these random cheap eBay stats to mains voltage after I have had them apart and seen what is inside.

From memory the L1 is switched internally to the L terminal and T1 & T2 are volt free contacts.

 

[Ryan Crowley]

Thank you i might just take your advice I have already started to look at a few Salus ones

 

[Lurch]

Thank you i might just take your advice I have already started to look at a few Salus ones

They are also available in most plumbers merchants and electrical wholesalers branded as something else.