underfloor heating

[paul b b]

hello chaps,

customer wants underfloor heating (wet type), dont want to sound like a total backside when the plumber turns up so just want to get a bit of info on installing stats and setback stats, do the come from the manifold etc?

any advice most welcome

thanks

 

[kme]

Zoned stats feed to zone valves after the manifold; which in turn have to control the heat source (e.g. boiler). The timer(s) switch the supply to the zone valves & stats, which in turn switch the heat source.

HTH

KME

 

[seajayess]

You need to find out what system the plumber is using, I have installed several Uponor systems know and if you are confident with S plan system you wont have any problems with this. Only real differance is the room elv stat opens an actuator which is connected to the wet loop uder the floor, this then powers the under floor circulating pump opens the valve which in turn powers the boiler hope this helps CJS

 

[ProDave]

You really need to get some proper information from the UFH supplier as different systems work in different ways.

Most, like the one I have in my house, have a central manifold (one on each floor in my house) from where all the heating pipes run. There is a control box next to the manifiold that controls all the valves on the manifold, so individual room stats connect back to the manifold controller directly with conventional 3c+E and likewise a master set back stat if used.

Timed heating demand from the programmer feeds power to each manifold when it's time for the heating to come on.

The manifold sends a "call for heat" to the boiler whenever one or more of it's zones is asking for heat.

Most UFH suppliers will give you comprehensive wiring instructions which you need to see before you first fix the installation.

But just to throw the cat amongst the pigeons, there is a totally different system used by invisible heating, and probably others where all the thermostats are networked on thin 4 core cable like alarm cable.

So you really do need information from the supplier before you start.

 

[batty]

As others have said info is needed, I have fitted a couple one used cat5 cable for control circuits for roomstats the other used three core and earth a lot will depend on what sytem it is.

 

[paul b b]

thanks chaps,

supplier is 'wundafloor' if anyone has used it. http://www.wundafloor.co.uk/technical.html

thanks again

 

[ProDave]

http://www.wundafloor.co.uk/downloads/Wiring%20Schematics%206%20zone%20Nov%2009.pdf

There you have it. All the information you need. Thermostats wired to manifold in 3c+E

 

[Andy™]

i notice none of those wiring diagrams are combi boilers, so if custoemr has a combi, you will need to do a little more work

 

[paul b b]

[quote name='Andy

 

[Andy™]

then you will have to treat the combi as a heater, use the stat connection as a 'on' signal, and use external controls for each zone. not really hard to do. done this to my combi - CH output feeds 3 port valve, 1 to house CH, one to conservatory U/F heating. used a 2 channel programmer, with 'HW' as U/F heating

if using 2 port valves for each zone, then you simply need a 3C&E from the boiler, in a radial to each zone - perm live, neutral, and switched live to signal the boiler to heat up

 

[paul b b]

ok thanks andy, i take it the boiler or system will come with a box for all 3c&e to go to, i take it they dont get wired direct into the boiler.

 

[Andy™]

no idea what it will come with - there are loads of different options. best find out where plumber plans each zone, and how its to be controlled, then work out where you need wiring to match

 

[paul b b]

thanks andy

 

[DarkInferno]

I had to fit a worcester oil fired with a 7 zone uponor system for downstairs and a 10 rad system for upstairs (a further 2 zones) a while ago... The wiring was..... creative.

Oh and it had a ground sourced heat pump mixed in.... Very fun to fit but took a bit to design.