How to get Devireg 500 under floor heating working?
I just moved in a flat, it has under floor heating, but it was all switched off, when I switch on the heating, it does not work, I already set up everything as Internet showed. Who can help me, please.
I would start by turning the timer off.
In that mode the stat should try and maintain the set temperature.
Then if you set the stat to say 35 and _wait_ the wavy symbol should eventually come on and the floor should start to warm up.
Important to wait because the stat has a feature that ignores short (10 min?) temperature drops caused by someone briefly opening a door/window.
This might be a simple 10 min delay timer so when you crank up the temperature to 35C you might have to wait 10 mins before it decides the element needs to be turned on.
Then there could be a further delay before you notice the floor getting hot due to the thermal mass of the floor.
The element should stay on until either the room reaches 35C or the floor sensor determines the floor is too hot.
The 550 has both room and floor sensors. When it's installed it should be set up so the element cuts out at a temperature that depends on the floor covering. According to..
http://www.devi.co.uk/downloads/devimat/08098002.pdf
..the max floor temperatures are:
Tiles on timber based floors 29°C
Tiles on concrete based floors 40°C
Timber covered floors (parquet etc.) 27°C
If the floor gets hotter than the above the FLOOR stat will switch the element OFF even if the ROOM stat isn't yet satisfied.
The floor will then cool and the FLOOR stat will switch it back on. eg The FLOOR stat should cycle the element on and off until the room stat is satisfied.
This cycling behavior might be what you are seeing. Eventually the room should warm up but it might take an hour or more.
If the room doesn't warm up after say 3 hours with the sat set at 35C then it's possible the max floor remperature was set too low. It's also possible the mat that was installed wasn't powerful enough (eg for a room of that size or with that level of heat loss/insulation) or there is another problem (perhaps a faulty mat if the floor is only warm in some areas?).
Other that that it may need a new circuit board.
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