Advantages: Low voltage startup, low frequency startup of compressor, no impact on power grid, voltage is not too low, air conditioning can rotate far. Low temperature heating, according to the difference between the set temperature and the indoor temperature, to change the speed of the compressor, thereby changing the energy output, improve the heating performance. Running quietly, the vibration of the compressor is small, so the noise of the outdoor machine is small. Defects: poor voltage impact resistance, frequency conversion air conditioning is not afraid of low voltage, voltage instability, frequent voltage fluctuation is easy to damage power module, is now common and frequently occurring frequency conversion air conditioning. The principle of frequency conversion air conditioning system is more complex than that of constant frequency air conditioning electronic control system, and the repair cycle is longer. Maintenance costs are high, the repairability of damaged parts is poor, and the cost is raised without reason. If the manufacturer has no spare parts, the machine will have to be scrapped.
Principle: Single-phase AC power 1PHAV220V, DC 310V through rectification and filtering, DC 310V through power module, and variable three-phase AC 3PHAC0-172V. According to the difference between the set temperature and the indoor temperature, the output voltage of three-phase alternating current is changed to control the running speed of the compressor. Differentiation: Fixed frequency air conditioning, constant speed of compressor operation, no change in energy output. Voltage, effect and noise are slightly better than others. Frequency conversion air conditioning, according to the difference between the set temperature and the indoor temperature, changes the speed of the compressor, is shaky, the energy output is variable, the effect can be artificially changed.