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Discuss Care home UFH wired incorrectly in the Water Underfloor Heating Installations area at PlumbersForums.net

OP
Michael Groves
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I am confused by what you mean by a master valve? Are there just 2 zone valves. If so you have to have these otherwise the under floor would only come on with the water and they will want the underfloor on by itself .
Master valve is my terminology as it governs the subordinate vavles, look at the diagram, it's in series with the manifold valves. The manifold valve triggers the boiler when any of the thermostats call for heat. All the thermostats are wired into a relay for this purpose.
 

Harvest Fields

S. Mod
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GSR
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Could be an old valve or it could be for a heating circuit. You need to double check it is for the UFH only.
 
OP
Michael Groves
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I’ll double check again to be sure there is no third circuit, but otherwise I’ll unwire and leave manually open, then tell plumber to remove when he next drains.
Thanks guys,
 

Harvest Fields

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GSR
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I’ll double check again to be sure there is no third circuit, but otherwise I’ll unwire and leave manually open, then tell plumber to remove when he next drains.
Thanks guys,
You need to make sure that it is definitely open all the time and cannot close at all or it needs removing at the same time.
 

RoryD

Plumber
GSR
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Ditch it, it appears superfluous looking at that diagram.
 

oz-plumber

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It may be wired in with the DHW valve.
When the DHW valve is opened - the valve in question might close.
May have been done to simplify the wiring?
 

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