https://www.freeboilermanuals.com/assets/pdf/potterton/Potterton-PowermaxHE.pdf
See Page 25, Heading "Sealed System" item 5.
You should have been handed the manual when the system was handed over.
Download the manual, pop it into a couple of memory sticks and your phone/laptop..
Read through.
Eeeysy
January 2022
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