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Discuss Re-pressurising brand new Glow worm boiler in the Central Heating Forum area at PlumbersForums.net
Thank you so much for answering so quickly.A temperature difference of half a degree isn't go to make much difference to pressure.
To answer your questions:
1. No, pressure loss per unit of time usually reduces as there is less pressure behind any leak.
2. For now, check it daily and re-pressurise as necessary. Keep a log of pressure before and after re-pressurising.
3. Re-pressurise with the boiler not running. Doesn't matter whether you turn the boiler off, or its's not running because there is no call for heat. Turning the boiler off ensures it doesn't suddenly come on.
A new boiler installation is likely to suffer some pressure loss at first as air comes out of the system. However, I wouldn't expect it to continue much beyond the first moth of active use. If it does, call the installers back.
This kind of sucks though since it's brand new and he did all the 'checks' and said it was 'perfect', lol, which as anyone knows, even brand new 'shiny' things can have problems, just hope that's not the case. We just want it working and not bothering with it, too much going on to deal w/boilers and all their quirks.The boiler should be topped when cold, the cause of the pressure falling rapidly after reaching 1.0 bar can be caused by a improperly set expansion vessel pre charge and filling pressure, the next time you top it up to 1.3bar? with a cold system note the pressure rise when hot. You could possibly have a leak somewhere as well but check that first or post the normal pressures between cold/hot that you have noticed.
Okay, John, hope you're still around.Would think that you can switch the boiler on and have the CH & DHW (if a combi) selected off to view the pressure even if its from a menu as you really need the boiler off and cold before topping up.
Thank you so much for your answers/help, John, and being there for us.Topping up when cold means that the top up pressure is a good reference point when you look at it now and then, say in the morning and you can easily see if its losing pressure, another plus point is that if you know what the pre charge pressure is then you will know exactly how much water you have lost, for example if you have a 10 litre E.vessel with pre charge & filling pressures of 1.0bar/1.5bar then you will have lost 2 litres in falling from 1.5bar to 1bar. it varies with the E.vessel size and the pre charge/filling pressures but generally you will have lost ~ 1.5 to 2.5 litres.
Hey John,I suspect the pre charge pressure may be too high, it should never be higher than 1 bar, if set to 1 bar then it should still take ~ 1.3/1.5 litres to bring it to 1.3 bar, if the pre charge pressure is set at => 1.3 bar then effectively you are running on the static head from the upstairs rads (when cold) and if no leak would expect the pressure to remain at 0.4 bar for a fairly long period.
What did the pressure rise to (from 1.3bar ) when the boiler/system was hot?. if say "only" 1.8/2 bar then you can increase the filling pressure by another 0.2/0.4 bar, if you now do this with system hot, don't exceed 2.3/2.5 bar and just observe the cold pressure when system cools down.
Reply to Re-pressurising brand new Glow worm boiler in the Central Heating Forum area at PlumbersForums.net
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