The most common cause of a noisy compressor at startup is a low refrigerant charge. This is because when there is not enough refrigerant in the system, the compressor has to work harder to compress the refrigerant, which causes it to make a loud noise.
2. Compressor failure
A failing compressor can also cause a noisy compressor at startup. This is because when a compressor is failing, its moving parts can become worn or damaged, which causes them to make a loud noise.
3. Refrigerant leak
A refrigerant leak can also cause a noisy compressor at startup. This is because when there is a refrigerant leak, the compressor has to work harder to compress the refrigerant, which causes it to make a loud noise.
4. Fan motor failure
The fan motor failure is another culprit for a noisy compressor. This is because the fan motor is what helps circulate the air around the compressor, and if it's not working properly, it can cause the compressor to overheat, which makes it make a loud noise.
5. Electrical issues
Electrical issues can also cause a noisy compressor at startup. This is because if there is a problem with the electrical wiring, it can cause the compressor to overheat, which makes it make a loud noise.
6. Thermostat issues
Finally, thermostat issues can also cause a noisy compressor at startup. This is because if the thermostat is not working properly, it can cause the compressor to cycle on and off too frequently, which makes it make a loud noise.
Sweating sub cooling
Sweating on the suction line can be caused by a number of issues. The compressor is pulling in too much vapor refrigerant. The evaporator coil is not absorbing heat and sub cooling the refrigerant correctly. The TXV is not working correctly and providing enough subcooling.
Pressures
Sixty psi on the low pressure side is a bit low. The normal operating range is between 65-80 psi. Suction pressure can vary depending on the ambient temperature.
Two-hundred psi on the high pressure side is a bit high. The normal operating range is between 150-175 psi. High pressure can vary depending on the ambient temperature.
Indoor temperature
Ten degrees of subcooling is recommended for most systems. Subcooling is the difference between the saturation temperature of the refrigerant at the condenser pressure and the actual liquid refrigerant temperature. Higher subcooling can mean that the system is overcharged.
Fifty-seven degrees at the register supply is low. The recommended supply air temperature is between 70-75 degrees.
Outdoor temperature
Eighty-eight degrees is a moderate outdoor temperature for HVAC design.
Additional Factors
When determining the cause of a noisy compressor at startup, it is important to consider the following additional factors:
- *The type of refrigerant being used*
- *The size of the compressor*
- *The age of the compressor*
- *The condition of the compressor*
- *The soundproofing of the compressor room*
By taking all of these factors into consideration, you can more easily determine the cause of a noisy compressor at startup and take steps to fix the problem.
It is always best to consult with a qualified HVAC technician if you are experiencing a noisy compressor at startup. They will be able to diagnose the problem and recommend the best course of action to take.
