Maintenance class | Air conditioner（Switch between warm air and cold air）

Precautions for switching between warm air and cold air of air conditioner

With the coming of summer，The temperature rose in a straight line，Air conditioning is indispensable for driving excavators to work.。For this reason，Xiaobian introduces the operation of air conditioning warm air switching cold air.，Points to be noted：

01Close the heater water valve

Close the inlet of the warm air duct at the same time.、Take out the two heater water valves.，Otherwise, when the cold air is turned on，The air conditioner is still blowing hot air.，In the long run, it will damage the air conditioning system.；

02Clean the condenser

Clean the condenser fins.，When the condenser has poor heat dissipation due to dirt and blockage，The cooling effect of the air conditioner is not good.，In winter, cold air conditioning is not used for a long time.，More dust must be accumulated on the condenser.，Therefore, careful cleaning must be carried out；

03Check the belt

Check the tension of the A/C belt and whether the belt is cracked and aged.，Replace if necessary；

04Clean the cab

Clean the cab interior，When the cold air conditioner is not used，Many drivers open the doors and windows of the cab for construction.，This must result in the accumulation of dust in the cab，After starting to use the cold air conditioner，Doors and windows are closed，Harmful substances such as flying dust circulate indoors.，It is bound to reduce comfort and be harmful to health，Therefore, it is necessary to clean the cab and the filter screen of the air conditioning blower.；

05Check the cooling function

After the implementation of the above matters，Then check whether the air conditioning refrigeration system operates normally.，Start the machine，Turn on the blower，Turn on the cooling switch of the air conditioner，Check if cold air is blown out，After confirmation，Turn off the air conditioner before turning off the engine.，Prevent damage to electrical equipment。

Air conditioning maintenance in July

Into July，The weather is getting hotter and hotter，Air conditioning system of excavator is used more and more frequently.。To avoid some common sense mistakes.，As a result, the air conditioner can not be used normally.，The following suggestions are made for the correct inspection method of air conditioning.：

About the use and maintenance of air conditioner：

（1）When the air volume at the air outlet of the air conditioner is gradually reduced along with the use,，Ask the customer to check and clean whether the air conditioning filter screen is blocked.，Daily vehicle drivers are requested to clean and check frequently.，Replace with a new A/C filter if necessary.。
（2）If the wind speed is too small or there is no change in the wind speed，Check the blower relay and its governor on site.。

（3）If the degree of refrigeration is insufficient，Professional personnel shall be invited to carry out detailed inspection of the equipped air conditioning system.，The focus should be on whether the amount of air conditioning refrigerant is normal.。

Phenomenon and Inspection of Too Much or Too Little Refrigerant in Air Conditioning：

（1）Too little refrigerant，Observe at the sight glass of the dryer，If a large number of bubbles appear，It means that the air conditioning system has insufficient refrigeration due to lack of refrigerant.。
（2）There is too much refrigerant，Observe at the sight glass of the dryer，When there is no bubble or a small amount of bubble，It means that the refrigerant is filled too much.，Ultra-high pressure phenomenon occurs in the system，To prevent the compressor from burning out，Realization of system self-protection function，This will also cause the air conditioning compressor to become inoperative。

（3）Under normal operation of the compressor，Normal high side pressure is 15kg/cm²Left and right，The range of high and low pressure of the system shall not exceed 1~32kg/c㎡。