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A thermostatic expansion valve (TXV) is designed to maintain a specific amount of superheat at the outlet of the evaporator. If the superheat value is too high or too low, the TXV may be the cause.

When troubleshooting a system with a thermostatic expansion valve (TXV), it is a good practice to measure the refrigerant’s superheat value leaving the evaporator. This is one of several good ...