The reason of compressor overflowing

In short, there are three reasons for the overflow of the compressor:
1.The condensation pressure of the refrigeration system is too high;
2.Too much refrigerant in the refrigeration system;
3.The compressor is missing the frozen oil.

Details are given below:
1、Poor heat dissipation of the external machine
Short circuit to external machine return and exhaust air:Such as the external machine is installed in the enclosed balcony, the narrow corridor, the house and other unventilated places, there are obstacles in front of the tuyere.

The external machine air volume is small and the cooling speed is slow: if the external machine condenser is too dirty or blocked by dust and oil, the fan motor speed is slow, the fan capacitance becomes smaller, and the temperature around the external machine is high.

2、External power supply voltage factor

The supply voltage is low or high, both cases will cause compressor high working current, and the domestic voltage is the majority, especially when the peak electricity.
 If the power supply voltage (i. e. voltage before startup) is too low: let the user to rewiring, if the voltage is about 190V, consider the voltage stabilizer, if it is too low is invalid.
Check the pressure drop after startup: under normal circumstances, the pressure drop is only a dozen volts, and the pressure drop is too large, the power line or rewiring, and faults such as poor line contact should be eliminated.

3、Refrigeration system failure
When mixed with air in the refrigeration system: if there is air in the system, the air is often stored in the upper part of the condenser, because it cannot be determined through the condenser and whether there is air in the system. If there is air in the system, fluorine treatment should be evacuated.
Excessive fluoride: the compressor is in an overload state for a long time, which will eventually lead to the compressor overload jump machine. This condition shall release a partial fluorine to.

4、Housing / high internal temperature
Poor lubrication of the compressor: the height difference of indoor and external machines is more than 5 meters did not return the oil bend, or made the return oil bend on only one pipe, and the system can not return the oil smoothly. The temperature of the compressor slowly rises during the operation due to lack of lubrication, which finally leads to overheating jump.
Impurities in the system, too much water: make the lubricating oil deteriorate, carbonization, can not play a normal effect, resulting in the compressor temperature rise sharply and overheating jump machine. This generally occurs on the repaired machine or used machine for a long time. If the substances in the inspection system is black, apply nitrogen cleaning system, replace the compressor, capillary assembly, and take time to add fluorine.

5、The compressor cooling effect is poor
The system is too little fluorine, the compressor working temperature is very high, the high temperature coil is by inhaled refrigerant to cool, if the fluorine is too little, the system flow is small, can not meet 100% of the evaporator load, resulting in the suction heat increase, plus the compressor intake flow is small, cooling efficiency is greatly reduced, so that a long operation can lead to compressor thermal protection.

Common causes of compressor coil burning

1, air conditioning compressor starts frequently
During the starting process of air conditioning compressor, there is generally a voltage start-up circuit, but the starting current will exceed several times the rated current, and the starting temperature of air conditioning compressor motor rises very fast. If the air conditioning temperature is not set properly, the cooling temperature is too low, and the heating temperature is too high, the air conditioning compressor will switch on and off frequently, which will shorten the life of the air conditioning compressor.

2, air conditioning compressor starts frequently
Bad supply voltage quality such as too high or too low, have a bad impact on the air conditioning compressor motor, especially beyond the rated voltage range of the air conditioning compressor, the most improper, long-term operation makes the air conditioning compressor motor in an inefficient overheating state, resulting in poor insulation, motor windings burned. In addition, the three-phase voltage or current imbalance will also cause increased motor loss (iron and copper loss), the air conditioning compressor motor coil temperature is too high, the superheater protection is improper, the insulation of the air conditioning compressor motor burned, resulting in short circuit burning of the air conditioning motor coil.

3, compressor burned down
For air conditioning refrigeration system once compressor burning fault, must clean up the refrigeration system thoroughly, air conditioning compressor motor burning will have strong acid generation and stay in the system, if not clean, when the new air conditioning compressor motor operation, residual acid substances will corrode the air conditioning compressor motor insulation, causing the new air conditioning compressor burning.

4, copper system is not clean
It contains water, water will also cause poor insulation of the air conditioning compression motor; water and refrigerant and frozen oil circulation in the system, after high temperature and low temperature and other state changes, will produce acid substances, and then destroy the insulation layer of the motor, a long working time, the air conditioning compressor motor will be burned.

 5, compressor is poorly cooled
The return temperature is too high or low to cool the compressor motor coil. The air-cooled heat pump unit occurs more frequently, and the high return temperature will also lead to too high exhaust temperature, resulting in a series of air conditioning compressor problems.

6, compressor start contactor fault
Contactor contact resistance is too large or sintering, causing short circuit burning of the air-conditioning compressor motor, or poor line contact, and the large starting current can easily burn the air-conditioning compressor.

7, metal chips
The mixed metal chips in the winding are responsible for short circuit and low ground insulation. Normal vibration of the compressor during the operation of each startup and the winding twisted by electromagnetic force cause the relative movement and friction between the metal debris between the winding and the winding paint line. Sharp metal chips can scratch the paint wrap wire insulation, causing a short circuit.