Pump Upstream Higher Pressure Issue 1

[nuuvox000]

This is how I'd like to pipe in a new heat exchanger into the existing building system. The pump shown is variable speed. I'm concerned that the higher pressure HWS upstream water will push more water through the pump than required when the pump is running at low speed. Do you think this will be an issue? Curious if the pump will "resist" the additional turning of the impeller if the upstream pressure is trying to push water through, when it's running. Thanks in advance!

 

[nuuvox000]

One more thought: I wonder if I should put the circuit setter next to the open/close valve to make sure we're not sending way too much water from the supply to return pipe. Like so:

 

[BronYrAur]

yes, I was just going to say that to you. And a circuit setter on your pump loop. I think that's what the "M" was showing on MTES93's drawing

 

[nuuvox000]

Ah, that makes sense now.

 

[HVAC-Novice]

you don't need a balancing valve or circuit setter. You control pump speed based on temperature. And the temperatures will fluctuate (either based on demand, or you main loop will fluctuate).