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Changhong air conditioning, refrigeration (heat) poor, periodic protection and maintenance technical guidance
Source: http://xrqa.cn Author: Mianyang Changhong air conditioning after sales maintenance update date: 2016-01-27 19:41
1. Fault phenomenon
Refrigeration (heat) poor, refrigeration (hot) for a period of time shutdown protection, but after a period of time to restart refrigeration (hot).
2. Fault analysis
The fault is the performance of overheat protection of indoor fan motor. In addition to considering the poor ventilation of indoor and outdoor heat exchangers and inappropriate cooling dose, it is also necessary to consider the problems of indoor coil temperature acquisition circuit.
3. Maintenance
The first step is to observe the indoor unit. If the filter screen is dirty, the fault can be eliminated after cleaning. If the evaporator freezes, the evaporator is usually dirty or the amount of refrigerant is small (too much refrigerant should be charged for the repair machine). After the ice on the evaporator naturally melts, observe whether the evaporator is too dirty. If it is dirty, clean it; If it is not dirty, check the low pressure of the refrigeration system to confirm whether the refrigeration dose is small.
Second, check Indoor coil temperature sensor and plug.