[Solved] Correct installation of the expansion vessel in the DHW installation

alienone 102156 31

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#31 17782218 16 Feb 2019 15:22

DiGital_Butcher DiGital_Butcher

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Post #31
17782218 16 Feb 2019 15:22

alienone wrote:
I have 80 liters of Boljer. Tomorrow's assembling the chip. I was a bit surprised by the white Flamco expansion vessel, the manufacturer recommends installation with the valve facing down, so I have to change the safety group as in the photo with the appropriate diameter for the vessel. I think it will be correct.

This bar in the picture is an example of how not to install an expansion vessel .... Check and shut-off valve in front of the vessel, how is this vessel supposed to work? Secondly, this beam is for central heating, not hot water, as my colleague noticed above, only rust will collect ...
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#32 17782246 16 Feb 2019 15:33

alienone alienone

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Post #32
17782246 16 Feb 2019 15:33

Topic to close with thanks to a fellow expat
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Topic summary

The discussion revolves around the correct installation of an expansion vessel in a domestic hot water (DHW) system. The user inquires about the accuracy of a provided diagram and the feasibility of installing an expansion vessel in their system, which includes a pressure reducer set at 4 bars. Responses emphasize the necessity of a check valve to prevent backflow and the importance of selecting the appropriate pre-charge pressure for the expansion vessel, which should be set lower than the downstream pressure. Recommendations include using a flow-through expansion vessel, specifically models from Flamco and Reflex, and ensuring proper installation to avoid issues such as water dripping from the safety valve. The correct pre-charge pressure for the vessel is discussed, with suggestions ranging from 1.5 to 4 bars depending on the system's pressure. The conversation concludes with the user planning to implement the suggested changes and confirming the installation details.
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