- Reaction score
- 4,325
First, I agree with PEG (#20) about employing an electrician to inspect and test in order to diagnose the electrical fault.
I am interested in helping you with this plumbing aspect of your problem:
' All working well for the past year, apart from rads getting hot then cool (as the water gets pushed round the system) so instead of standing with my hand on the rad flow pipe to turn the heating off in order for the store to heat up again, I wanted a pipe stat to turn the pump on at temp (55 deg?)'
I wanted to see an 'as installed plumbing diagram' to see where you had located the pipe stat - I assume you have put it into the radiator flow out pipe from the thermostore. I think this will be problematic because you will indeed have flow when the flow is above the preset temperature but when the temperature drops and the stat turns off, so does the flow; consequentially the water in the pipe will cool down - because there is no flow - and there can never be any further flow because the pump is not running because the stat is off because the water is too cold.
I think the pipe stat should be placed in the out flow pipe between the back boiler and the heatsink radiator after the normally open valve which feeds it. This way the pipe stat will detect when the water in the thermostore is at a high enough temperature to allow flow to begin through the other radiators. You would use the Normally Open contacts of the pipe stat in series with the pump line supply. By some trial and error you can set a suitable switching temperature. More simply this arrangements makes the household radiators warm up in tandem with the heat sink radiator and stops flow when the hot water from the back boiler is diverted to heat up the thermostore. It also stops the pump running when the back boiler is not lit.
I am interested in helping you with this plumbing aspect of your problem:
' All working well for the past year, apart from rads getting hot then cool (as the water gets pushed round the system) so instead of standing with my hand on the rad flow pipe to turn the heating off in order for the store to heat up again, I wanted a pipe stat to turn the pump on at temp (55 deg?)'
I wanted to see an 'as installed plumbing diagram' to see where you had located the pipe stat - I assume you have put it into the radiator flow out pipe from the thermostore. I think this will be problematic because you will indeed have flow when the flow is above the preset temperature but when the temperature drops and the stat turns off, so does the flow; consequentially the water in the pipe will cool down - because there is no flow - and there can never be any further flow because the pump is not running because the stat is off because the water is too cold.
I think the pipe stat should be placed in the out flow pipe between the back boiler and the heatsink radiator after the normally open valve which feeds it. This way the pipe stat will detect when the water in the thermostore is at a high enough temperature to allow flow to begin through the other radiators. You would use the Normally Open contacts of the pipe stat in series with the pump line supply. By some trial and error you can set a suitable switching temperature. More simply this arrangements makes the household radiators warm up in tandem with the heat sink radiator and stops flow when the hot water from the back boiler is diverted to heat up the thermostore. It also stops the pump running when the back boiler is not lit.
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