How to do cold storage fault repair and frosting behind expansion valve
As we all know, the direction of frosting is divided into two directions. There are two main types:
From the compressor return port, gradually frosting in the direction of the evaporator.
Frosting from the expansion valve to the evaporator.
Analysis of the difference between the two types of frosting, the reason is the opposite, so when the friends are troubleshooting, "can not only see the expansion valve, evaporator, return tube frosting, but also must distinguish the frost direction."
The air return mouth begins to frost
The air outlet begins to frost, mainly from the following two aspects:
1. Refrigerant aspect
The reason is that the refrigerant entering the evaporator is more, causing the evaporation to be incomplete, so the return pipe is still evaporating, absorbing the heat of the suction pipe, so the return pipe first frosts.
The reasons for this are:
1. Too much refrigerant;
2. The opening of the expansion valve is too large;
2, how to do the cold storage fault repair of the evaporator and the frosting behind the expansion valve
The evaporator can't absorb heat normally, or the cold volume generated by the evaporator can't be taken away, which will cause the evaporation to be incomplete. The refrigerant will continue to evaporate and absorb heat in the return pipe, causing the return pipe to frost.
The representation is that the return liquid temperature and pressure are normal or slightly lower, and the compressor is gradually condensed toward the evaporator from the gas return port. After a long time, all the ice is frozen from the compressor return port to the evaporator and the throttle valve to the evaporator section. After the zui, there is a low pressure.
The reasons for this are:
1. Look at the air filter is clean;
2. See if the fan speed is normal;
3. Is the evaporator clean?
4. Whether the air supply system is blocked or not;
5. Is the belt too loose?
Expansion valve begins to frost
Frosting behind the expansion valve is mainly analyzed from the following three points:
1. Less refrigerant (leakage)
The condenser has a high liquid return temperature but the pressure is not high, and the frost gradually turns toward the evaporator from the throttle valve.
2, the expansion valve opening degree is too small
The condenser return temperature and pressure are normal or slightly lower, and the frost gradually turns toward the evaporator from the throttle.
3, to check the sight glass cold storage failure repair and expansion valve behind the frost how to do
Look at the refrigerant condition, the foaming is serious, it may be the system leakage; the refrigerant in the liquid mirror does not bubble or seldom bubbling, it may be that the expansion valve is too small, or blocked, generally there will be a large temperature difference before and after the blockage .
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