Compressor overheating error and low valve temperature error.

Compressor overheating error

The thermistor is embedded in the compressor motor winding, and the resistance is generally 1kΩ. When the winding is overheated, the resistance value will increase rapidly. When it exceeds 141kΩ, the thermal protection module SSM will act to cut off the operation of the unit. At the same time, it will display an overheating fault and the TH fault indicator will be on.
The causes of compressor overheat failure are as follows:

Compressor overheating error and low valve temperature error

Compressor overheating error and low valve temperature error

(1) The compressor is overloaded and overcurrent runs. The possible reasons are: too high cooling water temperature, too much refrigerant charge, or non-condensable gas such as air in the refrigeration system, resulting in a large compressor load, manifested as overcurrent, and accompanied by high-voltage failure.

(2) Compressor overcurrent operation caused by electrical failure. If the three-phase power supply voltage is too low or the three-phase unbalanced, the current or the current of one phase is too large; the AC contactor is damaged and the contact is ablated, causing the contact current to be too large or the current to be too large due to the lack of phase.

(3) The overheating protection module SSM is damp or damaged, the intermediate relay is damaged, and the contact is bad. It is manifested as an overheating failure at startup, and the compressor cannot be started. If the electronic board of the unit fails or the communication fails, it may also falsely report an overheating failure.

7. Low valve temperature error

The temperature at the outlet of the expansion valve reflects the evaporation temperature and is a factor that affects heat transfer. Generally, the temperature difference between the outlet temperature of the expansion valve and the refrigerant water is 5 ~ 6 ℃. When a low valve temperature fault occurs, the compressor will stop, and when the valve temperature rises, it will automatically resume operation, with a protection value of -2 ℃.
The causes of low valve temperature failure are as follows:

(1) A small amount of refrigerant leakage, generally manifested as a low valve temperature failure rather than a low pressure failure. If the refrigerant is insufficient, it will evaporate at the outlet of the expansion valve, causing a temperature drop. The frost will appear at the outlet of the expansion valve. At the same time, the temperature of the suction port will be higher (superheated steam).

(2) The expansion valve is clogged or the opening degree is too small, and the system is not clean. If the refrigerant pipeline is not cleaned after maintenance, the refrigerant is impure or contains water.

(3) Insufficient refrigerant water flow or clogging of the evaporator, poor heat transfer causes low evaporation temperature and low suction temperature, and the opening of the expansion valve is adjusted according to the suction temperature, and the lower the temperature, the smaller the opening, resulting in Low valve temperature failure.

(4) False alarms caused by electrical faults, such as poor contact of valve temperature wires, cause the computer to display -5 ℃ unchanged.

Parts Are Old or Clogged

An air compressor is made up of a number of individual components that as they age, will wear down and make it harder for the unit to do basic functions.For example, if the interiors of your process become clogged up in vital areas, then the air compressor will have to work harder to just shoot air pressure from the compressor chamber and up towards all sorts of pneumatic tools.To make sure that your car’s parts are working smoothly and without overheating, visit a mechanic once a while to have the car’s performance evaluated.

Frequency of Use

Of course, the amount of wear and tear that an air compressor endures is also liable to affect its ability to operate at desired temperatures on an ongoing basis.

If the compressor is old and used regularly, a heating issue may result in further operation of the machine and its various peripheral components.

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