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My Viessmann Vitopend 100 boiler has been struggling with high pressure (going above 3 bar when the heating's on) for some time now.
This morning, a repair guy installed a new expansion vessel. He did not replace the old one, just connected it between the two valves you use to refill the system. (Please see below.)
(Not the cleanest job, I know.) Here's a picture of the rest of the system for some more context.
Unfortunately, this had no effect as the pressure still goes above 3 bar when the heating is on.
He first left the two valves closed and left. I realized the moment I saw the pressure going up, so I switched off the heating and called him. He then told me to open the bottom one. After I told him my tap water turned yellow, he apologized and said I should close the bottom one and open the top one. Unfortunately, that didn't help either.
1) Is this setup correct?
2) Is it possible that I somehow affected the expansion vessel's own pressure when I opened the wrong valve so it now needs repressurizing?
3) I was told the boiler pressure should be 1.5 bar when the heating's off. However, Viessman's website says it should be "between 0.5 and 1.0 bar" and the boiler manual says it should be "at least 0.8 bar". Is 1.5 bar perhaps too much?
4) Our pressure problems started after we renovated the bathroom and moved one of the radiators to a different wall, then replaced it with a bigger one. Is it possible something went wrong there? (The apartment has a total of 7 radiators now.)
Many thanks.
This morning, a repair guy installed a new expansion vessel. He did not replace the old one, just connected it between the two valves you use to refill the system. (Please see below.)
(Not the cleanest job, I know.) Here's a picture of the rest of the system for some more context.
Unfortunately, this had no effect as the pressure still goes above 3 bar when the heating is on.
He first left the two valves closed and left. I realized the moment I saw the pressure going up, so I switched off the heating and called him. He then told me to open the bottom one. After I told him my tap water turned yellow, he apologized and said I should close the bottom one and open the top one. Unfortunately, that didn't help either.
1) Is this setup correct?
2) Is it possible that I somehow affected the expansion vessel's own pressure when I opened the wrong valve so it now needs repressurizing?
3) I was told the boiler pressure should be 1.5 bar when the heating's off. However, Viessman's website says it should be "between 0.5 and 1.0 bar" and the boiler manual says it should be "at least 0.8 bar". Is 1.5 bar perhaps too much?
4) Our pressure problems started after we renovated the bathroom and moved one of the radiators to a different wall, then replaced it with a bigger one. Is it possible something went wrong there? (The apartment has a total of 7 radiators now.)
Many thanks.