A. Causes and treatment methods of excessively high compressor suction temperature:
1. Not enough refrigerant: Even when the expansion valve is open all the way, the refrigerant flow stays the same. This causes the refrigerant to get too hot in the evaporator, which makes the suction pipe temperature rise. It can also cause the compressor to overheat. This usually happens because of a leak. Check for leaks and add more refrigerant.
2. Expansion valve too open: This causes too little refrigerant to move through the system. As a result, not enough refrigerant enters the evaporator, leading to high temperatures in the suction line. This might be because the temperature sensor that controls the valve is not working properly. Another reason could be a blockage in the copper pipe where the temperature is measured.
3. Clogged filter at the expansion valve: A dirty filter reduces the flow of refrigerant into the evaporator. This causes some parts to be filled with hot gas, which raises the suction temperature. Also, if the return air ducts are too long or not well insulated, the suction temperature can become too high. To fix this, take apart the ducts, clean the clogged filter, and then carefully restart the system while watching the compressor temperature.
B. Main causes of high compressor discharge temperature
1. The main causes of high compressor discharge temperature: System refrigerant shortage.
2. The main air filter on the outdoor unit is blocked.
3. The compressor's air filter is blocked.
4. The compressor's air filter is blocked with ice.
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