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Sir if you have a passive system already, it is lacking proper pitch flat to slightly pitched 1/8" for 100 foot run. insulated heavy r-32 if possible then install proper themo-loop designed valve on return and flush out air. This design should maintain an 15 degree differential the total length...

In my experience we have design a vertical check valve design with a negative buoyancy washer to balance the gravity circulation. We always install a flush valve for air in the lines but in design the vertical valve will purge the air with usage but takes several times before all air is flushed...