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- 27 Jan 2008
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Simple question does the Greenstar 24-28 i Junior Combi have anti-cycle software, if answer is simply no, and it just retries after a fixed time then there is nothing I need to do.
However if it does have anti-cycle software then I am worried that the way it has been installed may defeat the software.
My engineering back ground tells me there are two ways to detect if all TRV's are closed so the boiler is no longer required to run.
1) Return water temperature.
2) Differential water pressure.
Once all TRV's are satisfied with an all TRV system the return water will be forced through the by-pass valve and will return hot. Either monitoring the lifting of by-pass valve or water temperature can tell boiler to turn off. With anti-cycle software that off time should vary, if on restart the boiler turns off again within a set delay time then the off time is increased, and if not it is decreased, so as summer arrives the boiler has longer and longer between re-tries. That is what I consider as anti-cycle software.
However on my mothers system we had two things which may defeat this from working, one is three towel rails without TRV's the other is there is an external by-pass valve as well as the one built into the boiler.
The boiler in Autumn and Spring does not seem to alter as far as off time goes, so if there is anti-cycle software it would seem it's not working. However until I know how the software works, trying to get it working is rather hit and miss.
So can anyone either tell me there is no anti-cycle software, or if there is, what does it monitor?
However if it does have anti-cycle software then I am worried that the way it has been installed may defeat the software.
My engineering back ground tells me there are two ways to detect if all TRV's are closed so the boiler is no longer required to run.
1) Return water temperature.
2) Differential water pressure.
Once all TRV's are satisfied with an all TRV system the return water will be forced through the by-pass valve and will return hot. Either monitoring the lifting of by-pass valve or water temperature can tell boiler to turn off. With anti-cycle software that off time should vary, if on restart the boiler turns off again within a set delay time then the off time is increased, and if not it is decreased, so as summer arrives the boiler has longer and longer between re-tries. That is what I consider as anti-cycle software.
However on my mothers system we had two things which may defeat this from working, one is three towel rails without TRV's the other is there is an external by-pass valve as well as the one built into the boiler.
The boiler in Autumn and Spring does not seem to alter as far as off time goes, so if there is anti-cycle software it would seem it's not working. However until I know how the software works, trying to get it working is rather hit and miss.
So can anyone either tell me there is no anti-cycle software, or if there is, what does it monitor?