Method for investigating indoor and outdoor communication fault points of VRV (Vacuum Reducer Valve) multi-connected air-condition unit

Abstract

The invention discloses a method for investigating indoor and outdoor communication fault points of a VRV (Vacuum Reducer Valve) multi-connected air-condition unit. The method comprises the following steps: when indoor and outdoor communication fault occurs, firstly checking and determining whether the communication between an outdoor machine and a first indoor machine is normal; if so, determining whether the fault is caused by address conflict of the first category of indoor machines; if so, carrying out fault clearance, if not, determining that the fault is caused by the problem of the second category of hardware, and going to the next investigating step at the time; investigating the fault caused by the problem of the second category of hardware: judging the communication connection problem of one indoor machine or several indoor machines by using a dichotomy; checking according to several fault causes after the communication problem of the indoor machine is investigated by using the dichotomy; and then removing the fault to ensure that the communication between the outdoor machine and the indoor machine gets right. The invention has the advantages of simplicity and convenience, reliability, quick investigating speed and high working efficiency.

Description

technical field [0001] The invention relates to the technical field of VRV air-conditioning systems, in particular to a method for troubleshooting indoor and outdoor communication failure points of VRV multi-connected air-conditioning units. Background technique [0002] The current VRV (Varied Refrigerant Volume) multi-connected air-conditioning unit is composed of one outdoor unit and multiple indoor units, ranging from a small-capacity multi-connected air-conditioning unit with one rotor compressor to one with 100 or even hundreds of indoor units. The large-scale screw compressor multi-connected air-conditioning unit, the whole system is complicated and huge. After the installation of the VRV multi-connected air-conditioning unit is completed, unit debugging is required to ensure the normal operation of the multi-connected air-conditioning unit and meet the requirements of the air-conditioned room. [0003] However, in the actual debugging process, it often happens that ...

AI Technical Summary

Problems solved by technology

[0004] 1. The connection of the three-core communication lines (GND, A and B) between the indoor / outdoor unit and the indoor unit does not use the special connector configured by the manufacturer before leaving the factory. Instead, the special connector is cut off and the three-core communication line is purchased by itself. In this way, it often happens that the communication lines between the indoor units are not connected one by one according to the GND, A and B line sequences of the three-core communication lines, but the three line sequences are wrongly connected; or the outdoor unit and the indoor unit The three wire sequences of the three-core communication lines are wrongly connected

[0005] 2. Although the indoor / outdoor unit communication line and the three-core communication line between the indoor units are connected according to the special connector provided by the manufacturer, the connector of one of the indoor units is not firmly connected, and it is loose, which leads to the failure of the unit. The indoor unit behind the indoor unit cannot communicate; or the communication cable connector of the first indoor unit connected to the outdoor unit is not securely inserted, and the communication failure between the outdoor unit and the indoor unit occurs

[0006] 3. On the premise that the communication lines between the outdoor unit and all indoor units are reliably connected, if two or more indoor units have the same address code, there will be address conflicts, which will also lead to communication failures

[0007] 4. If the electric control board of the indoor unit is broken, it will also cause the indoor unit and the subsequent indoor units to fail to communicate with the outdoor unit, and a communication failure will occur.

[0008] 5. For some reason, the connection plug of the communication line attached to the electric control board of the indoor unit and the connection socket of the communication line on the electric control board are loose or fall off for some reason. The machine cannot communicate, and there is a communication failure

[0009] 6. The plug of the communication cable attached to the electric control board of the indoor unit is connected firmly, but if one or even two or three of the three-core wires connected to the connector are disconnected, the indoor unit and subsequent The communication between the indoor unit and the outdoor unit fails, and there is a communication failure

[0010] 7. If the control board of the outdoor unit system is broken, there will be a communication failure between the indoor and outdoor units.

[0012] 9. The communication line attached to the electric control board of the outdoor unit is securely connected, but if the communication line on the plug is disconnected, it will also cause indoor and outdoor communication failures.

[0013] From the above causes of indoor and outdoor communication failures, we can see that there are many causes of failures, and the workload of troubleshooting and confirmation of the above-mentioned causes is very large; what's more, especially for the entire system with hundreds of indoor units, On the premise of not knowing which unit is faulty, it is necessary to check hundreds of indoor units one by one, and the workload is even more heavy