Small high-precision constant temperature and humidity air conditioners use high-efficiency compressors with high reliability. If the construction is strictly operated according to the correct procedures, the probability of failure during operation is very small. If the problems that may cause compressor failure can be discovered and corrected early, most compressor failures can be avoided. Therefore, it is recommended that customers contact after-sales service personnel regularly to check the operating status of the compressor and keep monitoring records.
When monitoring the compressor, check whether all electrical components of the compressor are operating normally:
1. Check whether the relay or contactor corresponding to the compressor is flexible and normal;
2. Check whether the high and low pressure switches are sensitive and normal.
3. Check whether the resistance of the compressor coil is normal and whether the insulation to the ground is normal;
If the compressor fails due to negligence in detection or other reasons, a serious cause analysis must be carried out before replacing the compressor of the small high-precision constant temperature and humidity air conditioner. Common faults mainly include the following two aspects:
1) Mechanical failure
The mechanical failure of the compressor is mostly caused by factors such as failure to strictly follow the operating instructions during installation, system refrigerant leakage during operation, and long-term liquid return operation of the compressor caused by improper debugging. In this case, the internal temperature of the compressor is too high, severe wear, stuck and other mechanical failures: its external manifestation is mainly that the resistance of the compressor coil may be normal, but the noise is loud after the compressor is started, the compressor shell heats up sharply, and the pressure difference cannot be established at the suction and exhaust ports of the compressor. If a mechanical failure is confirmed, the compressor must be replaced.
2) Electrical failure
The electrical failure of the compressor of the small high-precision constant temperature and humidity air conditioner is mainly caused by the burning of the compressor coil and the bursting of the terminal. In this case, the compressor has no response after powering on. At this time, the power should be turned off, and then the compressor junction box should be opened for visual inspection or the compressor resistance should be checked with a multimeter. If an electrical fault is confirmed, the compressor must be replaced.
When the compressor is completely burned out, the filter should be replaced at the same time as the compressor, and the expansion valve should be checked. If there is a fault, it should also be replaced. Before replacement, cleaning the system is necessary. If the cleaning method is unclear, please consult the after-sales service personnel of Radix.
3) Procedure for replacing the compressor.
Warning:
When replacing the compressor of a small high-precision constant temperature and humidity air conditioner, it is necessary to avoid direct contact of the skin with the refrigerant or lubricating oil, otherwise it will cause severe frostbite on the skin. Protective gloves must be worn when handling contaminated parts.
After replacing the compressor, the cause of the compressor failure must be carefully analyzed and eliminated. Otherwise, the new compressor may burn out again.
① Cut off the power supply;
② Connect the low-pressure gauge of the pressure gauge to the gauge joint on the stop valve, and drain the refrigerant to the outside;
③ Remove the electrical connection with the compressor;
④ Weld the connection joints on the compressor suction pipe and exhaust pipe;
⑤ Remove the faulty compressor;
⑥ If the compressor is completely burned, clean the refrigeration system pipeline;
⑦ Install the new compressor in place, weld the pipe joints, and connect the electrical lines;
⑧ Vacuum the system and add refrigerant according to the debugging specifications;
⑨ Power on the system according to the normal startup and debugging process, and check whether the system operating parameters are normal. Determine the amount of refrigerant added based on the system pressure and temperature parameters until the system operates normally.