How long before ufh can be commisioned

[Old Mod]

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To commission the heating properly the flow temperature should not be limited by room stats i.e. make sure the stats are disconnected ad operate the temperatures manually via the manifold mixing valve or at the boiler.

Thanks Alan.

 

[Dumbo]

Cement Based screed should not be commissioned before 21 days from curing but should be cured for 7 days after installation under polythene so if done correctly would be 28 days

Anhydrite screed UFH can be commissioned after 7 days

the process is always a debate as different standards suggest different methods however my advice is treat them both the same

switch on after above periods of time at minimum manifold temperature. usually 35 degrees C and leave for 3 days. then increase by 5 derees per day up to a maximum of 55 degrees and leave at this for 3 days. then reverse the process.

To commission the heating properly the flow temperature should not be limited by room stats i.e. make sure the stats are disconnected ad operate the temperatures manually via the manifold mixing valve or at the boiler.

Thanks
Much appreciated

 

[hmtiling]

I was right

 

[Jimcub]

As a diyer who put his own UFH in I can vouch for the above with a cement based screen. I used some lads from Bolton who laid 33sq mts for me with a laser and it was within 1mm according to the tiler.

Let it dry and cure slowly I waited till after the 21 days, then from a low heat did increase it 2 deg each day then had the tiles put down when it was cold. Keep the pressure in the pipes whilst cold I was told and did just that.
Result is a flat warm conservatory 21 deg all winter, heat loss was minimal and it was kept on 24/7. Not seen a great deal of difference in gas use as we didn't have to use the central heating as the UFH warmed the already warm house.