The voltage is low and the aging of the wire
VRV internal and external signal lines can be used to control the cable, the main control line is not allowed, because the signal line is usually 1.5 square below. VRV power supply: indoor unit 220V needs: zero line N, line of fire L, grounding protection PE380V need: zero line N, fire line L. FireWire L. FireWire L. ground protection PE outdoor unit 220V need: zero line N, FireWire L, grounding protection PE380V need: zero line N, fire line L. FireWire L. FireWire L. ground protection PE signal line indoor and outdoor machine communication line according to the manufacturers of communication control is not the same, generally need double-core shielded wire Yes, section 0.75-1.5mm?.
Signal line is best to use two-core shielded cable! Signal line diameter should not be too large or too small; signal lines can not wear the same wire with the power cord or tied together, if the parallel wiring, must maintain a certain distance.
Hello, first look at your extension is not the volume of the mute, and if you can not see what can not open, if not on your neighbors and the extension to try to see if the extension is not the problem Or the host of the problem,
There is a relationship, the aging of the wire will increase the resistance, so the voltage loss in the wire becomes larger, so the voltage will be reduced. Cable aging reasons: external damage. In recent years, the operation of the analysis point of view, especially in the rapid economic development of Haipu East, and now a considerable number of cable failures are due to mechanical damage caused. For example: cable laying installation is not standardized construction, likely to cause mechanical damage; in the buried cable to engage in civil construction is also very easy to run the cable damage. L sometimes if the damage is not serious, to a few months or even years will lead to complete breakdown of the damaged parts of the formation of failure, and sometimes serious damage may occur short-circuit failure, a direct impact on electricity and electricity units of safe production. Insulation damp: This is also very common, generally occurs in the direct or barrel of the cable connector. For example: the cable connector production failure and in the wet weather conditions do joints, will make the joints into the water or mixed with water vapor, a long time r in the electric field under the action of the formation of water branches, and gradually damage the cable insulation strength caused by failure. Chemical corrosion. Cables are buried directly in the area of ??acid and alkali, often lead to cable armor, lead skin or outer sheath is corroded, protective layer due to long-term chemical corrosion or electrolytic corrosion, resulting in protective layer failure, insulation reduction, Cable failure. The corrosion of the unit is quite serious.
