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boiler pressure
What is a normal cycle for pressure in LR?
Recently I observed that the boiler heating stops at 1.05 (and residual heat raises it slightly more to about 1.07 or so) and start at around .82.
Is it a proper setting, I thought it was supposed to stop at 1 ?
Recently I observed that the boiler heating stops at 1.05 (and residual heat raises it slightly more to about 1.07 or so) and start at around .82.
Is it a proper setting, I thought it was supposed to stop at 1 ?
Comments
there isnt a precise 'correct' value as it depends on the ambient temperature as that determines how much heat is radiated away to the surrounding environment
the longer the better as it indicates a nice tight system with no leaks - a boiler cycle of 30 seconds for example would definitely indicate a leak that needed to be investigated
my L1 (2012-16) machine had a cycle of 48 seconds and that did not have a leak
the LR will have a longer boiler cycle than an L1 (2012-16) as the thermosiphon is running at a pressure greater than boiler pressure, typically
you cant measure the boiler cycle time until the machine has been on for at least an hour, otherwise you will record an artificially low cycle time as the group is still heating up and is therefore drawing an elevated amount of energy out of the system
kind regards
reiss
The cycle and measurement were done after fully heated machine (>1 hour) and ambient temperature of 22C.
Cycle is quite long 115 seconds.
The question is: when the heating should be switching off, when pressure reach exactly 1bar, or at 1.05bar as in my case?
I'm not sure but I think it was switching before at 1, but I may be mistaken...
Thanks,
Lukasz
i wouldn't worry too much - i have measured the movement in the group surface temperature when the machine is sitting idle for an extended period of time and the wave height in the temperature response from top of pressure switch setting to bottom of pressure switch setting and back again is 0.1C, hour after hour
the pressure switch will open at 1.0 bar and then the pressure will continue to rise for a moment or two after and during this time the pressure will rise slightly above 1.0 bar
kind regards
reiss.