The evaporator changes refrigerant from a low pressure liquid to a low pressure vapor, and acts as a heat exchanger, removing heat and humidity from the passenger compartment.
Temperature is not a pressure or force acting on a TXV (Thermostatic Expansion Valve) diaphragm. The TXV diaphragm is primarily influenced by refrigerant pressure and spring force to regulate the flow of refrigerant into the evaporator coil. Temperature affects the superheat setting of a TXV but is not a direct force acting on the diaphragm.
A dx or direct expansion coil describes a type of heat exchanger. (As compared to chilled water.) The tx valve regulates the refrigerant. Systems without a txv will have a fixed orifice. The txv is generally more efficient than a fixed orifice.
The purpose of the External equalizer on the TXV is to compensate for the pressure drop in the evaporator coil , This is done since the superheat calculation is based on the difference in the Saturation temperature corresponding to the Suction pressure (Measured after the coil) and the actual suction line temperature. Now, in a TXV measurement of actual line temperature is accomplished by using the Sensing Bulb and the Measurement of the Suction pressure by the External Equalizer of the TXV. The opening/Closing of the Expansion valve is controlled by the setting of the superheat which is governed by the setting of the Spring.
It is 2.5 ton with standard non-TXV evaporator coil.
It could be restriction or low charge. Meaning you could have a bad txv valve or not enough refrigerant in the system.
Difference between txv and exv.
None, a TXV operates by it's sensing bulb sensing superheat of the suction line as it exits the evaporator coil.
Temperature is not a pressure or force acting on a TXV diaphragm. The pressure and forces that typically act on a TXV diaphragm are the evaporator pressure, spring force, and spring adjustment. Temperature indirectly influences the operation of the TXV by affecting the refrigerant pressure.
No, it is not.
Dual port TXV used when system need a large TXV for short periods of time. Dual-port valves have two independent capacities larger port for periods of high load smaller port for periods of normal load TXV capacity is doubled when larger port is open all the way.
step motor
step motor