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I was thinking should be like that. I don't know why was giving alarm last night. I closed it thanks for the answer guys. I appreciate it!

Hello guys, I have one question. Should this valve stay open or closed on my vaillant turbomax boiler? I had fiddled with it because I had low pressure after removing air from one heater. Now I do not know correct position. Like this _ or other way I? https://ibb.co/X3Wm1tK With it the other way...