Frost Chill Cooling
TXV Unit
Check the sensing bulb
Always check if the sensing bulb has been correctly located and is firmly in place and properly insulated. A loose, uninsulated or incorrectly located bulb will give false readings and improper freezing.
Adjust the TXV
If the refrigerant levels have been checked and the sub-cooling/Superheats are still not on par, you may have to adjust the TXV on the set screw.
Only turn the screw a 1/4 turn in each direction and wait approximately 15 minutes before turning the screw again.
Note that you may need to turn off the evaporator fans in order to get an actual reading.
If no changes occur, you will need to replace the TXV.
Size and Type
It can occur where the incorrect TXV has been installed which does not coordinate with the refrigerant used. This will cause endless headaches.
Always check the head of the TXV and compare it with the refrigerant specifications indicated on the compressor.
More in this Category
Troubleshooting guides
Compressor
Solenoid Valve
Defrost system
Filter Drier
Sight Glass
Thermostat operation
EVAPORATOR fan motor
Evaporator operation
TXV Unit
Condenser fan
Orifice
Heating Element
Drain heater
Suction line drier
Accummulator
CONDENSER fan blade
Interior Lighting
Condenser unit
Oil separator
Heating Sensor
Electrical Wiring
Rotork Service Valve
Compressor starter
Compressor PTC/Klixon
Compressor capacitor
HP/LP sensor
