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Can't switch water off when Central Heating is on. Need help please!
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<blockquote data-quote="Geoff1946" data-source="post: 532818" data-attributes="member: 28452"><p>In the most basic old fashioned "simple" system there would be no valves at all. Switching on the boiler would cause the water cylinder to heat up by thermo-syphon, working on the principle that the cylinder was located reasonably close and above the boiler. The central heating was controlled by switching the pump, usually via a room thermostat to circulate heated water to the radiators.</p><p>Consequently it was impossible to have heating without hot water and the controllers reflected this either by design or by swapping links on the back. (I have no knowledge of your particular programmer)</p><p>Your system appears to have two valves, which MAY be the hot water circuit and the heating circuit, separately controlled and both pumped. </p><p>In that case the two could be independently controlled with a two channel programmer. The boiler and pump would be switched by the contacts in the motorised valves, such that either valve could call for heat. </p><p>Changing the programmer MAY be as simple as unplugging the existing one and plugging in a newer type, if it is on a standard backplate.</p><p>It's a pity really that your heating engineer wouldn't see through the modification he suggested. The considerations are just as much plumbing/heating issues as electrical.</p></blockquote><p></p>
[QUOTE="Geoff1946, post: 532818, member: 28452"] In the most basic old fashioned "simple" system there would be no valves at all. Switching on the boiler would cause the water cylinder to heat up by thermo-syphon, working on the principle that the cylinder was located reasonably close and above the boiler. The central heating was controlled by switching the pump, usually via a room thermostat to circulate heated water to the radiators. Consequently it was impossible to have heating without hot water and the controllers reflected this either by design or by swapping links on the back. (I have no knowledge of your particular programmer) Your system appears to have two valves, which MAY be the hot water circuit and the heating circuit, separately controlled and both pumped. In that case the two could be independently controlled with a two channel programmer. The boiler and pump would be switched by the contacts in the motorised valves, such that either valve could call for heat. Changing the programmer MAY be as simple as unplugging the existing one and plugging in a newer type, if it is on a standard backplate. It's a pity really that your heating engineer wouldn't see through the modification he suggested. The considerations are just as much plumbing/heating issues as electrical. [/QUOTE]
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Can't switch water off when Central Heating is on. Need help please!
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