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Hello, the problem is most likely in low water flow through the ground water loop.
Tell me if the unit gets well water or if there is a closed circuit loop in plastic buried on the property.
If its well water clean the line strainers... If its a closed loop look for an air bleed at the high point of the ground loop connections at the climate master.
Tell me please about how old the system is, and is repair history.
We can go from there.
Is that 2 degree temperature drop across the ground loop supply and return? I need the exact temperatures if that is the case. This points to non enough pipe in ground loop for the 2 ton unit.
For comparison get me the temperatures of the supply and return on the 3 and 4 ton units, running separately, then with both running at the same time... let them run for 15 minutes before you take those readings... 5 to 10 degree split bare minimum is most common... less than that points to plenty of water flow, but not enough heat exchange surface.
Can you elaborate extensively on these 60 vs 40 figures?
Hello again, with only 0.9 degF differential on the 2 ton unit, there is very little heat transfer taking place. If the ground loop is too short on that system, then it will cool down a lot more than the ground loop on the 3 and 4 ton systems.
Run it for a while and do that comparison.
Further sets will require refrigeration service gauges to measure the compressor head and suction pressures.
If you can measure the supply and return air temperatures on the 2 ton unit that will help as well, be sure to do it before any electric resistance back comes on.
Repeat the test on the 3 and 4 ton units for a comparison.