the lower the delta T on the entering and leaving water temps does that corespond to a lower delta t on the return air and supply air delta t?

Would a higher flow and a lower EWT and LWT delta t allow the ground temperatuer to keep up with the heat pump better since the delta t is lower or since the flow is higher the source water would be exposed to the ground temp for a shorter time. Man this geothermal has so many variables. The cavemen had it easy fire hot / ice cold.

If you have "sub-spec" EWT and LWT, you could see low EAT and LAT at the same time.
I'm ready for a local guy to evaluate your system.
j

How are you doing Steve?

Tomorrow i will be hookign up two UP26-116 pumps to the air handler and two UP26-99 pumps to the water to water unit. This should give me the required flows to each unit while running simultaniously. (I am praying). When i meet the flow requirements i will be recording the EWT and LWT the delta T the RAT and the SAT and that delta T. I will also have my neighbor come over with his pressure gauges and record those pressures. Once i have this information i will post the numbers on here.

These pumps are attached to the same loop system, right?

Steve, How'd we end up?

It looks like it all ended up being a flow problem. After about 3 different combonations of pumps I found the best combination. When running individually the air handler is getting about 16 gpm (12 required) and the infloor unit is getting about 9.5 gpm (8 required). When both units run simultanously the flows drop to 10 gpm and 6 gpm respectively. This increased flow completely eliminated the frost inside the units. The delta T on the ground source water is lower however this has allowed the incoming water temperature to rise. My thought is that the horizontal trench system couldnt keep up with the higher delta T. Unfortunately i kind of ran out of that really cold weather we were having. I had about 15 days of good testing weather and i am pleased. So i hope that next fall i can get a good start and with the increased flow i hope to keep a higher incoming ground source water temperature. Thank you for all of your help.