Arthur wrote: > On 15 Aug 2009, at 14:59, arthurnaylor2...@... wrote: > > > Please will someone remind me: If the cut in pressure to activate the > > water pump is 20psi and the pump cut off switch pressure is > > nominally 40psi, > > what should the pressure be at the Schrader valve in the > > accumulator, and > > should this be measured with the water pump power supply off and > > the taps > > open? >
and Bruce replied: > Turn the pump off and open a tap to release the pressure in the > system. The pressure in the accumulator should be just over 20 psi, > so that the accumulator makes the most contribution to the flow of > water before the pump cuts in. > > Then close the tap and turn the pump on. When it stops the pressure > in the accumulator should be 40 psi. > Yeah but, why should an inactive accumulator cause bumping and spluttering in the water system? AFAIAA when an accumulator loses its accumulate all you will get is a more frequent running of the water pump to top up the system pressure. It is, surely, air in the system that causes the spluttering and, if the whole plumbing system before the pump is airtight then, once primed, how can air get into the system? I believe that you have another problem Arthur. I suspect that your accumulator checks will not help and I would look for air leaks before the pump as a first stage diagnosis. Roger
