quick question

[CXR100]

hi lads, im doing some plumbing work in a house that,s being extended , the new piece has underfloor heating thru (4 zones) and the old one has 6 rads. as im teeing into the 22 from the boiler to run flow and return to the maniflod do i have to fit a zone valve ??? if doing this then i would have to add a zone valve to the rads i suppose??? whats the best way of doing this in your oppinion? can i get away with no zone valves as there is no room stat in the old piece of the house!

 

[SimonJohns]

You'll need to run seperate pipes back to boiler.

If you put a zone valve anywhere in the system it will not have the desired effect

Go back to basics and draw the system out

 

[CXR100]

yes i have run seperate pipes from manifold back to boiler , ive only ever done new system before with zoning, never added to zones and re jig as such, but was thinking if i need a zone valve for the underfloor? just dont understand how the sparky is going to wire it in and stuff thats all , dont want him phoning me and askin why there no zone valves on the system, maby i sound stupid with this one but i just cant get my head round it sorry lads!!!!

 

[erj]

you need one zone vale for the rads and another for the u/floor heat, other wise the rads would heat up every time the u/floor heating switch on . Just treat it like a S plan and get the lecky to wire it as one. Hope this helps

 

[CXR100]

the stupid c..... forgot to put a cable in for a room stat in the rest of house tho! rf it is i guess then!!! i need to get into the attic to finish off some of the plumbing!!!!! it is like a oven there!!!

 

[oz-plumber]

As stated, you will need a zone valve for the radiators and a zone valve for the underfloor heating.
The radiators will have a far quicker response time than the underfloor heat.
A thermostat will be required for each zone to control the temperature for each zone.
You will also require a mixing valve for the underfloor heating which will require an additional pump.
When zoning systems you may require and additional by-pass valve depending on what zone valve you install or whether you are using actuators on the underfloor heating manifold.

Hope this helps.

Oz-plumber