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In the inverter multi-online central air conditioning system, the precise charging of refrigerant is the key factor to ensure the efficient and stable operation of the system. Overfilling or undercharging can adversely affect system performance. Determining whether the refrigerant in a system is at the right level often requires a detailed analysis of the symptoms of the system and expert testing data.
This article analyzes in detail the specific performance of inverter multi-online central air conditioners when the refrigerant is overfilled or insufficient, in order to provide you with practical guidance.
Chapter 1 Multi-online system refrigerant is insufficient
Refrigerant insufficiency equipment appearance
- Poor refrigeration effect: Refrigerants are key heat handlers, and when insufficient, the efficiency of absorbing indoor heat is reduced, resulting in poor overall cooling effect.
- Frosting of the return pipe: Lack of sufficient refrigerant, the evaporator works abnormally, and some areas are subcooled and frosted, while the liquid refrigerant flows back to the compressor with the gas that has not evaporated enough, and frosts are formed in the return pipe on the way.
- Compressor overheating: The refrigerant circulation is small, the cooling effect of the compressor is poor, and the heat discharged from the compressor is difficult to be effectively released, resulting in the overheating of the exhaust gas. In the case of Hitachi Multi Online, there may be a 08 shutdown code.
The phenomenon of insufficient refrigerant for indoor units
- Small temperature difference between inlet and outlet air: low evaporation efficiency due to insufficient refrigerant, insufficient air cooling, so the temperature difference is reduced.
- High coil heat exchange temperature: the refrigerant flow rate is small, and it is difficult for the refrigerant in the coil to remove enough heat, and the temperature rises.
- Large opening of electronic expansion valve: The system misjudges that the refrigeration difference is a flow problem, so increasing the opening to increase the flow rate is actually ineffective and may deteriorate the distribution and reduce the efficiency.
The phenomenon that the refrigerant is not enough for the outdoor unit
- Low high and low pressure: The pressure on both sides of the high and low pressure is low, and the condensation and evaporation efficiency are reduced due to the lack of refrigerant.
- Compressor overheating: The low amount of refrigerant circulation weakens the heat dissipation of the condenser, and the heat discharged from the compressor is difficult to release effectively, causing the exhaust temperature to rise, which may damage the compressor in the long run.
- High temperature at the top of the compressor: heat accumulation due to overheating of the exhaust gas and insufficient refrigerant circulation;
To be continued, next time we will release "Part 2 Appearance and Description of Excessive Refrigerant in Multi-online System"