Thermostat Replacement Help

[sam2232]

Hello everyone

ill be very appreciated if someone can help me replacing my old thermostat with a new one, i have attached few photos of the old and new thermostat and the boiler, please let me know if i can provide more pic that can help .

thank u all

 

[EFLImpudence]

Red to 1
Yellow to 3.

Blue(Neutral) and Green&Yellow(Earth) not required, put each of these wires in a separate connector block and position safely out of the way.

 

[sam2232]

so for neutral and Earth should i just cover them with plaster tape ?

 

[Deleted member 267285]

so for neutral and Earth should i just cover them with plaster tape ?

What’s plaster tape? Do you mean the mesh tape?

 

[sam2232]

electrical PVC tape , just to cover it .

 

[sparkwright]

You need to terminate the unused neutral wire and the unused earth wire in two separate 5amp connector blocks - or similar.

 

[Sureitsoff?]

NO put the unused wires into seperate bits of connector block ie

Connector Strip

Connect and manage cables easily with this 12-way connector strip. A flexible and transparent polyethylene design makes the strip incredibly easy to work with – a must-have in any electrical toolbox.• 5A 12-way connector strip• Quick and easy connection of cables• Polyethylene works up to 80°C•...

www.toolstation.com

and leave in the back of the mounting box as EFLI said earlier

 

[sam2232]

thank u all, ive iust added new pic of connector block just if anyone can confirm that am getting the right thing before ordering it . Many thanks

 

[Deleted member 267285]

thank u all, ive iust added new pic of connector block just if anyone can confirm that am getting the right thing before ordering it . Many thanks

Looks ok to me.

 

[sam2232]

its all wired now and the heating is on, but ive just noticed when i change the temperature to 10 the boiler is not stopping? any thoughts ?

 

[Deleted member 267285]

Depends on where the set point is and if it’s colder than 10 Degrees. Do you have any test equipment? I’ve had a few similar looking ones fail from new.

 

[sam2232]

i don't know how to adjust the set point, am gonna online , and if u call tell how to adjusted will much appreciated. thx mate

 

[Deleted member 267285]

It’s not adjustable. I would suspect a faulty one, do you have any test equipment?

 

[ericmark]

A central heating on/off wall thermostat with a modulating boiler is only there to stop the boiler cycling when we get a warm day, having a large difference between on and off temperatures is good. The room temperature is controlled by the TRV, as this works analogue, maintaining the room as set temperature with little or no hysteresis.

This is unless using oil or very old gas boiler, as modern gas boiler modulates (turns down) to ensure it gains latent heat from flue gases, it only turns off, and start to cycle, when it can't turn down any more.

You can get thermostats which turn boiler up/down rather than on/off, OpenTherm for example, but the main problem with a condensing boiler is without a wall on/off thermostat it would cycle on/off all day on a warm day, as unless it tries to circulate the water, it does no know if needed or not.

But in the heart of Winter, the on/off thermostat does nothing. If set up correctly.

 

[stem]

Whilst you were installing it, at any point did you try it with the blue wire (or earth wire) connected to any of the thermostat terminals?