I know with a piston the system is charged based on the superheat, and txv's with sub-cooling. How do you charge a system with a txv on the condenser and a piston in the evaporator?
superheat in air conditioning.
That would be called a heat pump.
The TXV in the outdoor unit is bypassed, either externally or internally in teh cooling mode.
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How many times must one fix something before it is fixed?