Quote:
Originally Posted by MEMPHIS91
Because I am not switching the direction of flow. It will only heat, I just need it to switch from sending heat to the air condenser to the water condenser. But I still needed the suction to operate the valve.
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Aha, that's what you're doing! Solenoid actuated switching of heat between your aquaponic fish tank and greenhouse airspace is brilliant. I assume your fish tank will have another dx coil in it, not a forced flow hx. When this dx coil is disconnected from the compressor discharge, its outlet will have discharge pressure present, which will tend to fill the coil with liquid backwards. In essence, the dx coil will act as a subcooling liquid receiver. This will affect your system charge and hold some oil as well. Considering your dx ground loop size, a suction line accumulator near the compressor would be a prudent addition.