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The machine is in the condition of heat pump in winter, the initial boot time, outlet air temperature is higher, shows that work. Work after a period of time, the wind temperature gradually decline, so that eventually can't heating. Through inspection found that the frost is very thick, the outdoor heat exchanger to heat. MGpservice manual download site
MGpservice manual download site
Fault detection, such as above, shown below. Disconnect air conditioner power supply, unplug defrost thermostat terminals on the plug, measuring defrost thermostat, found that the conduction, still account for defrost thermostat failure. MGpservice manual download site
MGpservice manual download site
MGpservice manual download site
The appearance of the air conditioner defrost thermostat as shown in the picture on the right. It has two heat pipe, one of the heat pipe installation into FengKouChu outdoors, outdoor environment temperature tl perception; The other end of the heat pipe inductive bulb, firmly fixed on the outdoor heat exchanger, sensing the temperature of the outdoor heat exchanger t2. The double pipe heat defrost thermostat and single heat pipe is the biggest difference between defrost thermostat: breaking point and the conduction of the former point is dynamic, namely t (defrost thermostat breakpoint temperature) is not constant, t with t1 (outdoor environment temperature) and t2 (outdoor heat exchanger temperature) and the change of the temperature difference between them. Defrost thermostat off contact is the important conditions: when the outdoor heat exchanger temperature t2 is lower than 0 ¡æ, and delta t (delta t = t1, t2) for more than a few degrees Celsius, defrost thermostat contacts to disconnect. If the delta t = 0 ¡æ or delta t is very small, even if the t1 material t2 < - 10 ¡æ, defrost thermostat contacts will not disconnect. If the t1 and t2 there is no difference in temperature, the heat exchange, does not exist in the outdoor heat exchanger will not frosted, indoor heating. Now that air conditioner can very thick frost, indicating that the temperature difference between the defrost thermostat off contact and defrost thermostat contacts can't disconnect, defrost thermostat is damaged. Defrost thermostat contacts cannot be automatically disconnect has the following three conditions:
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