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Central Heating & Storage Heaters Forum
Faulty Immersion & 3-Port Valve? How To Test?
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<blockquote data-quote="Doc Hudson" data-source="post: 325554" data-attributes="member: 1607"><p>The basic rule for any wiring fault finding, (not just heating controls), is never assume anything that you haven't proved yourself. Irrespective of what a customer may or may not say about what or when something has or hasn't happened. If you don't test and verify all relevant cables, connections, voltages, polarities etc.. you are at some stage guaranteed to get led up a wrong line of investigation because something you thought was correct was never correct. Some jobs have been wired wrong since day1, others may have been messed with by a plumber or DIY, before they call you in to investigate. All heating is simply a supply controlling a load, via various combinations of Manual switches, Timer switches, Thermostat switches, Valve position switches. Take a step by step approach checking the circuit through from supply to load.</p><p></p><p>A problem that Steptoe hinted at is that some people can only copy wire positions from various manufactures wiring center diagrams without having a clue as to the actual purpose or function of any of the wires. Providing you understand what the various wires are actually doing, then central heating control is not much harder than two or three way light switching. A few parallel and series switching paths to fire a boiler, with some taking a priority over others.</p><p></p><p>Also as a general rule the levers are there to provide manual positioning of a valve, they are not there to give an indication of the electrical position of a valve. So in many cases just looking at the lever will not tell you much.</p><p></p><p>Doc H.</p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 325554, member: 1607"] The basic rule for any wiring fault finding, (not just heating controls), is never assume anything that you haven't proved yourself. Irrespective of what a customer may or may not say about what or when something has or hasn't happened. If you don't test and verify all relevant cables, connections, voltages, polarities etc.. you are at some stage guaranteed to get led up a wrong line of investigation because something you thought was correct was never correct. Some jobs have been wired wrong since day1, others may have been messed with by a plumber or DIY, before they call you in to investigate. All heating is simply a supply controlling a load, via various combinations of Manual switches, Timer switches, Thermostat switches, Valve position switches. Take a step by step approach checking the circuit through from supply to load. A problem that Steptoe hinted at is that some people can only copy wire positions from various manufactures wiring center diagrams without having a clue as to the actual purpose or function of any of the wires. Providing you understand what the various wires are actually doing, then central heating control is not much harder than two or three way light switching. A few parallel and series switching paths to fire a boiler, with some taking a priority over others. Also as a general rule the levers are there to provide manual positioning of a valve, they are not there to give an indication of the electrical position of a valve. So in many cases just looking at the lever will not tell you much. Doc H. [/QUOTE]
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Faulty Immersion & 3-Port Valve? How To Test?
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