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How do you check the pressure on an Ariston unvented expansion vessel?

Hi I have an Ariston unvented hot water storage cylinder with a separate expansion vessel model ITI 125. There is a discharge from the expansion valve and it states in the instructions that it may be the vessel and it will need to recharged to 3.5 bar. How do I check the pressure and then recharge accordingly?

Henry Gray
October 2010
AristonHeating, Home Heating SystemsCheck Pressure Hot

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