Hi
I have an Extrol 30 expansion tank on my gas boiler, (hydronic system) and I wanted check pressurization and make sure it's working properly. I am able to isolate the boiler without draining the entire system to check, however do I need to drain the boiler at all? The tank is supposed to have a precharge of 12psi when empty and I thought if my boiler went down to 10psi when cold I could check the tank pressure then and not need to drain the boiler. If the tank is low I could pump it up to 12psi and make sure the boiler stayed below that mark since if the tank pressure is greater then the boiler pressure it should be able to fully fill with air to 12psi. Is my hypothesis off? What is it I am not thinking about or taking into consideration.
Thanks for your feedback.
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