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Storage Heaters & Central Heating controls Forum
Advice - No hot water flow on-demand
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<blockquote data-quote="Sidewinder" data-source="post: 426427" data-attributes="member: 9512"><p>The bottom valve is a PRV, however, I am guessing that this picture is taken with no flow, i.e. no taps open.</p><p></p><p>Thus you have going on for 6 bar of static pressure on the PRV output as this is where the gauge is connected on these PRV's I use lots of them.</p><p></p><p>That is unless the gauge is goosed.</p><p></p><p>These valves come preset to 3 bar.</p><p></p><p>There is a straight slot for a screwdriver in the top of the cone to the left of the pressure switch in the picture posted.</p><p></p><p>Find out which line this is in and draw water down it, turn the pressure down all the way when there is water flowing, then stop the flow and see what the pressure rises to.</p><p></p><p>IF, it returns to 6 bar the PRV is goosed, change it.</p><p></p><p>If it doesn't, then turn the pressure up slowly until you hit 3 bar and try the system again.</p><p></p><p>IF, there is an intact plastic film over the adjuster, then the PRV is goosed, change it.</p><p></p><p>I don't like the Caleffi PRV's I've had too many issues, noisy, leaks, failures etc.</p><p></p><p>So, I now exclusively use Honeywell.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 426427, member: 9512"] The bottom valve is a PRV, however, I am guessing that this picture is taken with no flow, i.e. no taps open. Thus you have going on for 6 bar of static pressure on the PRV output as this is where the gauge is connected on these PRV's I use lots of them. That is unless the gauge is goosed. These valves come preset to 3 bar. There is a straight slot for a screwdriver in the top of the cone to the left of the pressure switch in the picture posted. Find out which line this is in and draw water down it, turn the pressure down all the way when there is water flowing, then stop the flow and see what the pressure rises to. IF, it returns to 6 bar the PRV is goosed, change it. If it doesn't, then turn the pressure up slowly until you hit 3 bar and try the system again. IF, there is an intact plastic film over the adjuster, then the PRV is goosed, change it. I don't like the Caleffi PRV's I've had too many issues, noisy, leaks, failures etc. So, I now exclusively use Honeywell. [/QUOTE]
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Advice - No hot water flow on-demand
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