The 600' of 1" pex will be 2 loops of 300' (as A/C said lower pumping energy)
2 manifolds using 1 ECM pump.
Pump will only run when HRV is on AND:
In Summer mode
OR
In Winter mode, when outside air temperature is colder than the loop water temperature.
Loops will be 7-9' below grade behind house & parking area retaining wall.
I expect the return temperature to be about 35*F in Winter & 45*F in Summer.
I will only add glycol if needed.
I will need to find an inline air filter placed before the air/water heat exchanger.
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