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Help Needed: Horstmann H37XL Controller Wiring
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<blockquote data-quote="Doc Hudson" data-source="post: 485913" data-attributes="member: 1607"><p>There would appear to be nothing wrong with that wiring in my opinion. Traditional Y-plan heating circuits need a live-Neutral &amp; Earth supply to the controller. And the controller only needs to give three Live outputs; (Heat On - Water On - Water Off). These are needed to position the valve correctly to heat up either water or radiators or both. The wiring has quite correctly being done with 1x 3-core cable to the controller and 1x 5-core cable providing an earth and the three live outputs. (the neutral on the 5-core flex is not needed). So I would swap your controller if you have already bought it, but I would also add faulty symptoms may be related to a sticking valve.</p><p></p><p>Heating valves have an electrical contact to output a supply to fire the boiler. A trigger signal from your controller should make the valve operate, move into position, then fire the boiler. (You don't want the boiler firing if the valve is closed!) So if the valve sticks or the switch does not work, a perfectly good controller will not be able to operate the boiler.</p><p></p><p>Doc H.</p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 485913, member: 1607"] There would appear to be nothing wrong with that wiring in my opinion. Traditional Y-plan heating circuits need a live-Neutral & Earth supply to the controller. And the controller only needs to give three Live outputs; (Heat On - Water On - Water Off). These are needed to position the valve correctly to heat up either water or radiators or both. The wiring has quite correctly being done with 1x 3-core cable to the controller and 1x 5-core cable providing an earth and the three live outputs. (the neutral on the 5-core flex is not needed). So I would swap your controller if you have already bought it, but I would also add faulty symptoms may be related to a sticking valve. Heating valves have an electrical contact to output a supply to fire the boiler. A trigger signal from your controller should make the valve operate, move into position, then fire the boiler. (You don't want the boiler firing if the valve is closed!) So if the valve sticks or the switch does not work, a perfectly good controller will not be able to operate the boiler. Doc H. [/QUOTE]
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Help Needed: Horstmann H37XL Controller Wiring
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