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Hydronic system fill PRV setting?

Hydronic system fill PRV setting?

Hydronic system fill PRV setting?

(OP)
I know from the following that a PRV should be set to maintain 4PSI at the top of the system for "positive venting".

https://www.deppmann.com/blog/monday-morning-minut...

But what if the PRV is actually at the top of the system? (Same elevation as my chilled water piping). Do i just set it at 4PSI? Or should I use a minimum of some other pressure?

RE: Hydronic system fill PRV setting?

You should set it so that you don't exceed the design pressure of your system at the lowest point. It would be better to set it higher than 4 psig. You always need to allow some margin from normal/max operating and relief pressures.

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RE: Hydronic system fill PRV setting?

In addition to the PRV on the water makeup line set to maintain minimum 4 psig above the highest piping static water level pressure provide a relief valve vented to floor drain that would open before the maximum allowable water pressure in the system is reached if the water makeup PRV fail open.

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