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I'm after a bit of advice from you heating engineer experts.
I have wired many boilers previously but never to include a wood burner
I have been asked to wire an S plan heating system, no problem with this.
They have also installed a wood burner with a gravity rad and twin coil cylinder.
They have fitted a N/O valve on the return of the stove, low level and high level pipe stats.
Now this is where I'm struggling to see what they want.
N/O valve to close when boiler is running unless the L/L stat makes and opens said valve.
H/L stat opens Heating valve and runs pump but does not fire the boiler.
I can see how to wire the H/L stat to operate v/v, pump via relay, I can see how to include N/O v/v part but just cant get my head around the L/L stat and opening v/v or even why its required.
Any ideas would be greatly received
I have wired many boilers previously but never to include a wood burner
I have been asked to wire an S plan heating system, no problem with this.
They have also installed a wood burner with a gravity rad and twin coil cylinder.
They have fitted a N/O valve on the return of the stove, low level and high level pipe stats.
Now this is where I'm struggling to see what they want.
N/O valve to close when boiler is running unless the L/L stat makes and opens said valve.
H/L stat opens Heating valve and runs pump but does not fire the boiler.
I can see how to wire the H/L stat to operate v/v, pump via relay, I can see how to include N/O v/v part but just cant get my head around the L/L stat and opening v/v or even why its required.
Any ideas would be greatly received