UFH sensor question

[jashton]

In the UFH guide it says to run the sensor in conduit so that it can be replaced. I can see the sense in that so I've done that but am now wondering what to do when I tile. Surely the sensor needs to be bedded in adhesive, just under the tiles so that it picks up a correct temperature? When I laid my SLC I shuttered off a small area around the sensor other wise it would have been bedded in SLC and non-removable.
So what do I do next. If I don't bed in addy then it will under-read. if I bed in it won't be removable.
One possible option is to wrap tin foil around the head so it can be bedded in but would then slip out of the foil if I do ever need to replace (unlikely I imagine).
Any tips/ideas?
Thx

 

[Yorkshire Tiling Services]

The conduit should be put in a channel in the floor and self levelled over. The sensor can be inserted afterwards.
Conduit, if not supplied with kit,can be bought in 2.5 metre lengths, it is usually 10mm in diameter.
It is designed for use with under floor heating

 

[jay]

just to add to the above quote condute should be sealed at one end to stop slc entering and probe must not come in contact with any metal objects ( tin foil included) hope this helps :8:

 

[Yorkshire Tiling Services]

just to add to the above quote condute should be sealed at one end to stop slc entering and probe must not come in contact with any metal objects ( tin foil included) hope this helps :8:

Sorry,forgot to mention that

 

[The Legend; Phil Hobson RIP]

Spot on advise above, chase in conduit seal end. Slc over, I would add, I usually stretch conduit by placing sealed end under a weight eg. breeze block or the like, then feed in the sensor prior to installing

 

[jashton]

ok so that means the sensor just sits inside the conduit and that the heat will transfer through to give an accurate reading. In that case I just need to pull the sensor back an inch so it's inside the conduit and then seal the end. Easy

Thanks

 

[diamondtiling]

ok so that means the sensor just sits inside the conduit and that the heat will transfer through to give an accurate reading. In that case I just need to pull the sensor back an inch so it's inside the conduit and then seal the end. Easy

Thanks

Yup............:smilewinkgrin:

 

[Time's Ran Out]

I always tape the wire at the thermostat end so its not pulled back during connection and moved out of the heating mat area!

 

[The Legend; Phil Hobson RIP]

Uncanny that TJ, I do exactly that. Great minds and all that

 

[doug boardley]

good idea TJ Will do that myself in future:8:

 

[trevortine]

This is a preferred method of mine also but when i challenged the warm up rep about why they dont supply conduit i was informed that they insist on the probe being covered in screed or adhesive to ensure correct readings. It does make sense but would obviously mean lifting a tile to replace if faulty. After many years of fitting them ive never had to change a probe so maybe they have a point? I always tend to fit probe at easy location to change just incase though.

 

[kilty55]

warmups data sheets reccomend conduit but when i called them about this they said the opposite also and said they guarantee the mats etc regardless of conduit being used,

 

[Time's Ran Out]

good idea TJ Will do that myself in future:8:

Had a floor at Christmas that was warm but the thermostat was reading 12 degrees!
First time 'we' (little john) didn't tape the thermostat end cable and yes the electrician had pulled the cable tight and moved it 30cm out of position.
So you learn the hard way and it meant taking up 2 tiles to pull it back, but if you mark the location of the sensor on a plan in the guarantee book it makes life easier!
From what I understand from the electric UFH we have done - mats have a 10 year guarantee and the sensor 2 years - so that should give you all the reasons you need to make it as easy as possible to replace.

 

[lcjohno]

i dont think the manufature garantees the probe for the same time as the heat mats/wire. Thats why i think it needs to be removable. there must be a chance it can fail. If its buried in addy there's a chance you can break all the wires aswell.

 

[trevortine]

i dont think the manufature garantees the probe for the same time as the heat mats/wire. Thats why i think it needs to be removable. there must be a chance it can fail. If its buried in addy there's a chance you can break all the wires aswell.

I always screed ufh and have never damaged a mat or probe during installation. You really need to be doing something wrong to do so. Anything can fail but if you install exactly as manufacters instructions then you are covering your back.