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Zilmet Expansion Vessel check/topup

  • 17-04-2024 12:39pm
    Registered Users Posts: 114 ✭✭

    Hi all

    I have a 22L expansion vessel and want to check the air pressure/top up if required. Theres a Schrader valve on top. Does the tank need to be isolated from the system to do this ie physically disconnect the pipe or can it be checked with pump off, tap open etc. Pre-charge is 3 bar but this is showing around 38psi