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Dimplex XLE150 Storage Heater with a Fan Control Problem. Also Model Variant options. Are there any?
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<blockquote data-quote="Reptech" data-source="post: 559518" data-attributes="member: 38266"><p>An update and further thoughts...</p><p></p><p>I fitted a replacement main charge controller PCB on Monday and have to say the fan has operated correctly shutting off instantly at the allotted time... and yet I'm still a bit unconvinced strangely.</p><p></p><p>This is what's bugging me now. The curious note in some documentation stating 'the fan may take up to 1 minute to respond'. I had a chance when fitting the new board to do some quick observations and I can confirm that at the exact second the fan is due to come on that 240 volts appears across the motor winding. Its a squirrel cage shaded pole motor of just 8 watt rating.</p><p></p><p>So 240 volt across the motor and... zilch. No movement whatsoever. After say 10 to 15 seconds it starts crawling round, crawling as in inching its way forward but very smoothly. It then starts to slowly increase over a minute or so to what is still a pretty slow speed but enough to waft air out.</p><p></p><p>Is the fan sticky? I don't really know.</p><p></p><p>The speed as far as I recall is supposed to alter on demand and in past years I've heard it ramp up for a short time and then throttle back. Nothing like that these last few days, even with the old PCB fitted.</p><p></p><p>So I'm wondering whether we have a motor issue as well... which leads me back to the original issue. Was that real or a symptom of something else? Well it certainly wasn't behaving as it should for a whole week following the sudden 'failure' and with a new board it does behave, at least for the two days running so far.</p><p></p><p>So second bugging nagging thought... and this gets a bit 'electronici' now. Was the motor not switching off because of some change in back emf on the coil by it running slow (if indeed it is running slow... I'm not certain yet). That can cause triac based switching to 'not let go' and I was certainly aware of a change in sound from the motor as I toggled between fan on and fan off (where it kept running). Was the board trying to turn it off and failing.</p><p></p><p>Different board, different components, maybe a triac more immune to this effect (high dV/dT rate of change). Who knows. The new board seems to have effected a cure for that.</p><p></p><p>The fan I might investigate although not immediately. I tried seeing how free it was by pushing the rotor around and must admit it didn't feel all that free but I've zero experience on that. Gently pushing the outer edge of the blades and it all felt more normal.</p></blockquote><p></p>
[QUOTE="Reptech, post: 559518, member: 38266"] An update and further thoughts... I fitted a replacement main charge controller PCB on Monday and have to say the fan has operated correctly shutting off instantly at the allotted time... and yet I'm still a bit unconvinced strangely. This is what's bugging me now. The curious note in some documentation stating 'the fan may take up to 1 minute to respond'. I had a chance when fitting the new board to do some quick observations and I can confirm that at the exact second the fan is due to come on that 240 volts appears across the motor winding. Its a squirrel cage shaded pole motor of just 8 watt rating. So 240 volt across the motor and... zilch. No movement whatsoever. After say 10 to 15 seconds it starts crawling round, crawling as in inching its way forward but very smoothly. It then starts to slowly increase over a minute or so to what is still a pretty slow speed but enough to waft air out. Is the fan sticky? I don't really know. The speed as far as I recall is supposed to alter on demand and in past years I've heard it ramp up for a short time and then throttle back. Nothing like that these last few days, even with the old PCB fitted. So I'm wondering whether we have a motor issue as well... which leads me back to the original issue. Was that real or a symptom of something else? Well it certainly wasn't behaving as it should for a whole week following the sudden 'failure' and with a new board it does behave, at least for the two days running so far. So second bugging nagging thought... and this gets a bit 'electronici' now. Was the motor not switching off because of some change in back emf on the coil by it running slow (if indeed it is running slow... I'm not certain yet). That can cause triac based switching to 'not let go' and I was certainly aware of a change in sound from the motor as I toggled between fan on and fan off (where it kept running). Was the board trying to turn it off and failing. Different board, different components, maybe a triac more immune to this effect (high dV/dT rate of change). Who knows. The new board seems to have effected a cure for that. The fan I might investigate although not immediately. I tried seeing how free it was by pushing the rotor around and must admit it didn't feel all that free but I've zero experience on that. Gently pushing the outer edge of the blades and it all felt more normal. [/QUOTE]
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Dimplex XLE150 Storage Heater with a Fan Control Problem. Also Model Variant options. Are there any?
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