How To Check Superheat On Txv. Make sure that the system has a proper charge. Wrap your thermocouples with insulation to.
By responding to these variables, the txv maintains a predetermined superheat within the evaporator. The txv also responds to the refrigerant pressure within the evaporator, which is transmitted to the txv by an equalizer line. The accumulator is an important protection device as well and we will discuss this later in this article.
On txv systems with high superheat, be sure to check the subcooling as refrigerant is added.
First take all of your refrigerant readings as well as your liquid line and suction temperature at both ends (on a split system). Use the dew point temperature on the pressure/temperature chart to obtain the evaporator saturation temperature for superheat, and the bubble point temperature to obtain the condenser saturation temperature to measure subcooling. A superheat near 0 degrees will allow the compressor to get damaged by liquid refrigerant entering it. The fact that these readings are normal indicates the low suction pressure is not caused by low refrigerant, but insufficient heat getting to the evaporator.cause #2: