Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Differential pressure bypass valve in a variable speed system
I am rebuilding my heating system and I have a question about using a bypass valve. As currently piped, the secondary loop has a bypass valve between source and return. And a dumb circulator pump way oversized. I understand why this bypass would be used. But does it make sense to include this when the circulation pump in the secondary loop is a smart pump that adjusts pressure and flow.
In this situation I can see some sort of high pressure overload relief valve. But not a reaction to a range of normal variable pressure conditions. It could be a bypass valve with sufficient range. But any relief pressure across the secondary less than the maximum possible generated system head presented, would circumvent the intelligent operation of the pump. Allowing flow through the bypass at various pressures could confuse the pump and cause it to run at high pressure when it should not.
Does it make sense to put in a bypass valve in this circumstance. I have not yet looked for a bypass with the "proper" range. Or is there an alternative? I am also not precisely sure if the pump will deal with everything without a bypass. The pump is an AquaMotion AM55.
An explanation of how things should work in this situation would be greatly appreciated.