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Central Heating & Storage Heaters Forum
Drayton LP241 Problem - Pump and Boiler Constant Running
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 497823" data-attributes="member: 250"><p>You have to keep in mind the concept of typical heating arrangements...</p><p></p><p>[ Power supply ] ---&gt; [ Timer/Programmer ] ---&gt; [ Thermostat (Cylinder or room) ] ---&gt; [ Motorised valve, to open up flow to required pipes ( Water or heating) ] </p><p></p><p>[ Power supply ] ----&gt; [ Switch inside motorised valve, (switch should only be on when the valve has opened) ] ----&gt; [ Boiler &amp; Pump ]</p><p></p><p>So in your case if a micro switch has failed in the on position inside a valve, even with programmer and thermostats 'off'..</p><p></p><p>you sill have a direct supply through to the boiler &amp; pump.</p><p></p><p>The valves are used as relay switches to prevent back-feed from the boiler holding all valves in the on position.</p><p></p><p> :coffee </p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 497823, member: 250"] You have to keep in mind the concept of typical heating arrangements... [ Power supply ] ---> [ Timer/Programmer ] ---> [ Thermostat (Cylinder or room) ] ---> [ Motorised valve, to open up flow to required pipes ( Water or heating) ] [ Power supply ] ----> [ Switch inside motorised valve, (switch should only be on when the valve has opened) ] ----> [ Boiler & Pump ] So in your case if a micro switch has failed in the on position inside a valve, even with programmer and thermostats 'off'.. you sill have a direct supply through to the boiler & pump. The valves are used as relay switches to prevent back-feed from the boiler holding all valves in the on position. :coffee [/QUOTE]
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Drayton LP241 Problem - Pump and Boiler Constant Running
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