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Ok, I just turned the screw near the connection where the brass cap was and the pressure is going up again. Thank you so much for your help.

Does the heating system have to be turned off before I can do this?

Hi Dan, do they help? if not let me know what else you would need an image of.

Hi everyone, I've found a few articles on this site regarding a Range Tribune HE heating system with and expansion valve and instructions of how to increase the pressure, but they all refer to having a connection near the vessel which I do not have (as shown in the picture). I have connected...