Scout wrote:

Final product readings at full load conditions:
GPM (of closed loop): 1.3
delta T (closed loop): 8 Fahr deg
Total rejected heat: 5,198 btu/h
Saturated evap temp: 45 deg Fahr
Superheat of suction gas: 12 deg
Saturated condensing temp: 105 deg Fahr
Liquid Subcooling: 10 deg
delta T (air) 19 Fahr deg

OK, I withdraw my previous comments.

How do you get the evap & condensing temps? Very few AC units have that kind
of instrumentation.

Also curious: how many feet of copper tubing in your secondary heat
exchanger?

DSK