What does the equalizer line on a TXV connect to?

The equalizer line on a thermal expansion valve (TXV) connects to the suction line. This connection is crucial for the proper operation of the TXV, as it allows the valve to sense the pressure in the suction line and adjust its opening accordingly.

By connecting to the suction line, the equalizer line helps the TXV to regulate the flow of refrigerant based on the actual load conditions in the evaporator. This ensures optimal cooling efficiency and prevents issues such as flooding or starvation in the evaporator coil. The TXV uses the pressure from the equalizer line to balance the internal pressure against the bulb pressure, facilitating the precise control necessary for maintaining the desired superheat level.

Understanding this connection is vital for troubleshooting and maintaining residential air conditioning systems, as improper functioning of the TXV can lead to inefficient system performance or damage.