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Central Heating & Storage Heaters Forum
Can't switch water off when Central Heating is on. Need help please!
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<blockquote data-quote="Stevie G" data-source="post: 532985" data-attributes="member: 25777"><p>Hi Guys ,this system is not gravity fed ,as pump common to both HW & CH 2-port spring return valves . I take it the pump is fitted in the return pipework to the boiler ?</p><p>Call for HW on programmer, and prove valve opens and see if pump operates and boiler fires up. </p><p>On the 2-port spring return valves there is an Aux switch that makes (Closes Contact) when valve opens fully which should start the pump and enable the boiler to fire ! Depending how the electricians have wired the controls, the system is 37 years old and the controller shows it was manufactured in 1987 , i have known electricians not to use the aux switches as they never fully understood control strategy .</p><p>Hope this has gave you some food for thought !</p><p></p><p>Geoff 1946 is correct in summing up old gravity HW - pumped CH system .</p></blockquote><p></p>
[QUOTE="Stevie G, post: 532985, member: 25777"] Hi Guys ,this system is not gravity fed ,as pump common to both HW & CH 2-port spring return valves . I take it the pump is fitted in the return pipework to the boiler ? Call for HW on programmer, and prove valve opens and see if pump operates and boiler fires up. On the 2-port spring return valves there is an Aux switch that makes (Closes Contact) when valve opens fully which should start the pump and enable the boiler to fire ! Depending how the electricians have wired the controls, the system is 37 years old and the controller shows it was manufactured in 1987 , i have known electricians not to use the aux switches as they never fully understood control strategy . Hope this has gave you some food for thought ! Geoff 1946 is correct in summing up old gravity HW - pumped CH system . [/QUOTE]
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Can't switch water off when Central Heating is on. Need help please!
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