Yuchai U35, Руководство оператора

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Air conditioner (if provided)
For the air conditioning equipped for the cab of this machine, its operating knob is set on the
left control box panel of the cab.
For the specific operation and maintenance of the air conditioning system, please refer to
the operation manual of the air conditioner attached to the machine while referring to this
manual.
1. Precautions for air conditioning maintenance
1) Air conditioning box assembly with dust screen must be cleaned regularly once a month,
otherwise the dust and dirt will block the dust screen, making the indoor air cannot pass
through the heat exchanger smoothly, affecting the air conditioning effect.
2) When using the refrigeration system in summer and ventilation systems in spring and
autumn, the heating valve should be closed first; when using the heating system in winter,
the heating valve should be opened first and the air conditioning switch should be turned to
the OFF position.
3) Because the heater core is connected with the engine water tank, the water tank will be
short of water once the heater core leaks, causing the engine to overheat. In winter, it is very
important to prevent the heating core from freezing and cracking, just as it is to prevent the
water tank from freezing and cracking. In order to prevent the heating core or water tank
from freezing and cracking due to the frozen coolant, please use the coolant designated by
the OEM. If necessary, in winter when the coolant may freeze, drain the coolant if the
shutdown time is long!
4) If the air conditioning system is not used for a long time, please operate it every half a
month for 5 to 10 minutes each time.
2. Inspection of refrigerant dosage
The skin and especially eyes can easily be frozen by refrigerant. In addition,
the refrigerant will emit toxic phosgene when catching open fire. Therefore,
whenever it is necessary to disassemble the refrigeration system, it is
necessary to recover or discharge the refrigerant before disassembly in the
condition that the refrigerant will not be sprayed on the skin and eyes. Make
sure there is no open fire during the whole process!
If there is no refrigerant, the cooling
performance will be poor. Check the
refrigerant every month or every 250 hours.
Operate the air conditioning to reach a
strong cool state when the engine is idling at
high speed. Determine the amount of
refrigerant according to whether there are
bubbles in the liquid sight glass on the drying
bottle, in order to check the refrigerant
dosage.
Liquid
sight
glass
Proper amount
of refrigerant
Insufficient
refrigerant
Too much or
insufficient
refrigerant