thermostat with a small differential + anticipator?

[Mark07]

Hello,

I need some advice please. The central heating in our home oscillates the house temperature too much. It's specially uncomfortable at night, waking people up when the bedrooms become too hot.

I've just done some Googling and I learned about thermostats with smaller differentials (some even adjustable), and about anticipators. Excellent.

At Amazon I found a thermostat with adjustable differentials (down to 1C), and some others with anticipators. However, I couldn't find a thermostat with both.I guess it's probably due to lack of details in Amazon's tech descriptions?

Any suggestion please?

Cheers,

Mark

 

[Howsie]

Hi Mark, what do you have at the moment? Do you have TRV on the radiators in the rooms? If so, which ones? What's the property dimensions/type.

 

[ShaunCorbs]

and what room stat do you have at the moment

 

[Howsie]

and what room stat do you have at the moment

Good question.

 

[rpm]

and what room stat do you have at the moment

And where?

 

[Mark07]

Hi Howsi, ShaunCorbs, rpm,

Thank you for the replies,

We have a Honeywell thermostat, mechanic/analogue, looks oldish, I don't know the model name or number.
And Honeywell TRVs in all rooms, they look like this:
(I tried to post a link to a photo of a TVR that looks like ours but the Forum didn't allow it.)

The house is a smallish 3 bedrooms semi-detached (75m2). The thermostat is on the ground floor, in the hallway, by the stairs.

We have a toddler and his bedroom needs to be warmer than mine. I leave my TRV off, but even so my bedroom gets too hot for me. We leave the TRV in the hallway (near the thermostat) fully open, as the living room and the bathroom's upstairs. My son's (the toddler) TRV at 2, and his room's door closed.

 

[ShaunCorbs]

any chance you could pop the cover off to the stat there should be either 3 or 4 wires there

if theres just two theres your issue

 

[Howsie]

The TRV's (if working) should stop the overheating. I'd wager that they've seized. You can check easily, YouTube turned up this: https://www.youtube.com/watch?v=phFW-IIsH54

 

[Mark07]

any chance you could pop the cover off to the stat there should be either 3 or 4 wires there

if theres just two theres your issue

Hi ShaunCorbs,

I opened it, there are 3 wires, one is half green half yellow, another is blue, and a 3rd is brown.

 

[Mark07]

The TRV's (if working) should stop the overheating. I'd wager that they've seized. You can check easily, YouTube turned up this: https://www.youtube.com/watch?v=phFW-IIsH54

Thanks for the link Howsie, I'll check them tomorrow.

 

[ShaunCorbs]

Hi ShaunCorbs,

I opened it, there are 3 wires, one is half green half yellow, another is blue, and a 3rd is brown.

so 2 wires as green / yellow is an earth

the problem you have is no neutral which takes a new stat range from + or - 5dc to + or - 1dc

you have three options

replace with a battery digital one or get a heating eng/spark to run a new cable 3 core + earth and fit a new stat

or the third get a rf stat fitted

in the correct place eg 1.5m from floor and if a rad is there no trv to be fitted just normal lockshield

 

[drip-dry]

think howsie is right...trv,s faulty..

 

[Mark07]

Thank you v much ShaunCorbs,

I'll deal with it tomorrow. I guess a battery powered will be the easier and cheaper option, right? As I may be able to fit it myself?

And do these battery digital ones have a small differential? And anticipator? Don't anticipators require a 3rd wire, for the little "heater"?? Can a battery do that??

Cheers,

Mark

 

[Gasmk1]

No you need a 3rd wire for an anticipator,

 

[ShaunCorbs]

No you need a 3rd wire for an anticipator,

not if its battery

and yes and depends how diy you are and tools etc