dry ufh. Floor temp probe positioning?

[pe2dave]

Arranging ufh in kitchen+adj utility. Lots of conflicting advice re probe position.
(What makes sense to me).
1. Fit in conduit for ease of replacement.
2. Fit 'close' to heating element (which is what it is sensing). Without touching.
3. Fit as close as sensible beneath the controller on the wall.

Not clear to me. Some say 'within 300mm of wall', others 'centre of the room'.

Am I right in thinking that the room temperature will make little difference to the sensed temperature (e.g. cold utility, hot kitchen).

Bit confused to say the least.
(I'm asking since my kitchen fitter has no electrical experience)

 

[Uheat – Jake]

There is no wrong or right of how far into the room the sensor should go, however it should go directly inbetween 2 runs of heating cable as illistrated on the diagram attached.
If the sensor is to close to the heating cable it'll give you a incorrect reading and giving you a false output.
The sensor should be installed within conduit for ease of access incase of a failure.

 

[pe2dave]

Thanks - so midway between two wires rather than close to one.
Any idea What max temp the controller should be set to for ceramic floor tiles please?

 

[Uheat – Jake]

There isn't a max temp for tiles only wood floor and carpet.

 

[pe2dave]

Which raises the question, is a probe necessary for ceramic tiles?

 

[Uheat – Jake]

Which raises the question, is a probe necessary for ceramic tiles?

A Floor probe is needed to monitor the floor as it's a live element within the floor. Its a British Standard to have one.
If you didn't have a sensor and the cable you have was to overheat you'd have nothing there monitoring it which could then create problems.

 

[pe2dave]

Which implies there should be a max temp on the stat / controller Jake?
What am I missing please?

 

[Uheat – Jake]

Which implies there should be a max temp on the stat / controller Jake?
What am I missing please?

Anything over 27 degrees will feel uncomfortable on your feet. All UFH Systems are best to be run at a low temperature constantly. The default our thermostats come at is 35 degrees.

 

[westward10]

As above you need to consider bare feet on the tiled area. Personally I would set 22 deg.

 

[DefyG]

A Floor probe is needed to monitor the floor as it's a live element within the floor. Its a British Standard to have one.
If you didn't have a sensor and the cable you have was to overheat you'd have nothing there monitoring it which could then create problems.

Jake, I have come across systems whereby the sensor has failed and due to being poorly installed (ie no conduit), unable to be replaced.
Had no choice (short of major upheaval of the floor) but to re-program thermostat to operate on air temperature alone. Is this not permitted according to BS?

 

[Uheat – Jake]

Jake, I have come across systems whereby the sensor has failed and due to being poorly installed (ie no conduit), unable to be replaced.
Had no choice (short of major upheaval of the floor) but to re-program thermostat to operate on air temperature alone. Is this not permitted according to BS?

Indeed it must have a sensor within the floor to limit the floor temperature. We used to sell a thermostat which had a infra red floor sensor reading the floor temperature however we no longer have these anymore.