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expansion vessel?

what is the correct pressure for a vokera mynute 20 expansion pressure vessel and what are the symptoms if the pressure is too low. My boiler fires up for a few seconds then shuts down again any ideas if this is related to pressure problem?
Dave Pearson, December 2010
check condensate pipe isn't frozen

brian, December 2010
The pressure will be stipulated by the manufacturer (usually has a label on the vessel indicating the charge pressure) Generically 0.75-1.0 bar

And no, it's not related to the other issue you have.

Carefree, December 2010
link Click here to see other fixes for Vokera.