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Are 2 port valves necessary on the15454653639711748620316.jpg flow of heating if a underfloor heating manifold is used such as this one in the picture? As far as i was aware the manifold acted as a valve.
Thanks
 

chris watkins

Esteemed
Plumber
The manifold controls the temperature of the water & the rooms but what it can't normally do is provide an "interlock" with the boiler which is required by Part L of the Building Regulations.
Effectively what this means is that when the last power head on the manifold closes there must be a mechanism that turns the boiler off to stop it from wastefully cycling.
 

chris watkins

Esteemed
Plumber
It also normally provides independent time control for the U/F against other heat emitters or areas which is also a requirement.
 
Ok i thought the actuators provided effective open close mechanisms for the zones, are you saying that the for the SL for the boiler should be wired in series via the 2 port valve?
 

chris watkins

Esteemed
Plumber
Ok i thought the actuators provided effective open close mechanisms for the zones, are you saying that the for the SL for the boiler should be wired in series via the 2 port valve?
SWL through the end switch of the zone valve is the norm.
It is down to you to prove / provide that the "interlock" is in place if not.
 
Ok think I'm with you, bear with my I'll just a humble spark, so valve wired to far left interlock terminal and then switch wire off to boiler.15454727486191005077118.jpg
 
A

Aire

The manifold controls the temperature of the water & the rooms but what it can't normally do is provide an "interlock" with the boiler which is required by Part L of the Building Regulations.
Effectively what this means is that when the last power head on the manifold closes there must be a mechanism that turns the
How can that manifold not provide interlock? Interlock is easily provided by the room thermostats that will be used for each zone. Zone valves are used to separate systems when required. If you have a fully pumped/system boiler then yes a zone valve is required to separate the heating and hot water circuits but if you don't require your ufh to be separated from your radiator circuit then a zone valve isn't required.
 
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A

Aire

Yes you will require a zone valve to separate the heating and hot water circuits
 
I already have a valve on the hot water for the cylinder but do I need another one for the heating? Or will the manifold suffice?
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Best to else you could get warming of the ufh when the hot water is on
 

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