Discuss Just fitted K3 radaitor and the centre front panel won’t heat up in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net
There's also a fairly high pressure drop through even the clean boiler Hx, if you wanted say 20kw output at a dT of 15C, (1146LPH) (to achieve reasonably high radiator outputs then the Hx pressure drop alone is almost 3M so doesn't leave much remaining head available to circulate the system if a LLH isn't installed.
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I thought the 20C dT was a sort of standard to compare different boilers but didn't know that the boiler would try and maintain this but difficult on a heat only boiler since it doesnt contol the circ pump. Some Vaillants have return temperature control but I rarely see it mentioned.
Hello John,This shows perhaps why a K3's front panel doesn't heat up as much as the others and should also be filled very slowly?.
I have quite a few old double panel type 22s, these have only two little manifolds on the bottom connecting the two panels, nothing on the top except two bracing strips of welded on steel plate but both panels have separate air vents which makes them very easy to refill and get rid of the air.
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Reply to Just fitted K3 radaitor and the centre front panel won’t heat up in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net
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