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Expansion vessel check on potterton puma 80e?

How can i tell if the expansion vessel pressure on my potterton puma 80e is correctly?
D.WILCOX, May 2008
to check the pressure, you first have to drain the system water to the vessel, then you can use a tyre pressure gauge to measure the pressure at the schreader valve

T, May 2008
link Click here to see other fixes for Potterton.