TCL ITCA-60CHRA/DV3I, Техническое руководство, Страница: 109 / 113

DC Inverter Air
reduction of the lubricant of the compressor;
b. The air and the moisture enter the system and they enable the lubricant and air‐conditioning oil to begin to
acidify and heat to finally become the gelatinous substance and cause the stuck of compressor after the
compressor has been operated in high temperature and high pressure for a long time;
c. In order to remove the residual acidified air‐conditioning oil in the AC system, the carbon tetrachloride (CTC)
or other cleaning liquid is now used widely to clean the piping system of air conditioner. The CTC left on the pipe
wall is sometimes diluted by the refrigerant and air‐conditioning oil. The diluted CTC is operated together with
the refrigerant and AC oil in the high temperature and pressure for a long time to cause the acidification and
heating of AC oil to finally become the gelatinous substance and cause the stuck of compressor.
(4) Compressor Liquid Strike Fault: the excessive liquid refrigerant that is not evaporated is sucked into the
compressor to cause the wreck of compressor liquid strike scroll.
Specific fault symptom:
a. The compressor is unable to start, which leads to the current protection or compressor built‐in protection
(insertion);
b. After the wreck of compressor liquid strike scroll, the scroll fragments will fall on the motor coils to damage
the insulation layer of the coil and cause the burning of coil;
c. The compressor can run, but it has no high or low pressure and has a small current.
Specific fault symptom: it causes the current protection or compressor built‐in protection (insertion) shortly after
the compressor is started.
Reasons:
a. The compressor is subject to a liquid strike due to excessive adding or charging of refrigerants in the cooling
system;
b. During the cooling process of the system, the fan of indoor unit does not work or the capacitor capacitance
decreases, fan speed is low, air duct is clogged and the filter screen and heat exchanger are dirt, which all
possibly cause the incomplete evaporation of the refrigerant and even the liquid strike of the compressor;
c. During the heating process of the system, the fan of outdoor unit does not work or the capacitor capacitance
decreases, fan speed is low, air duct is clogged and the heat exchanger is dirt, which all possibly cause the
incomplete evaporation of the refrigerant and even the liquid strike of the compressor;
d. During the cooling process, the electronic expansion valve of indoor unit in the VRF system does not work and
it is still in the normally open state. At this moment, the refrigerant is not evaporated to absorb the heat, causing
the liquid strike of compressor.
2. Notes to Replacement of Compressor
For any compressor fault, it is necessary to analyze the lubricant of damaged compressor oil during the
replacement and repair.
(1) The oil is very dark and turbid (see the following figure), and the moving parts in the compressor have
undergone the serious wear.
a. it is necessary to replace the compressor;
b. It is also necessary to replace the low‐pressure storage tank in the system and at this moment, some
deteriorated lubricants of the system have been stored in this storage tank;
c. the high‐pressure nitrogen is used to blow the waste oil of the whole cooling system to ensure the waste oil is
removed thoroughly from the whole cooling system.
(2) The oil shows the dark red and it is not turbid (see the following figure) and the moving parts in the
compressor have undergone the light wear.
a. it is necessary to replace the oil in the compressor;
b. It is also necessary to replace the low‐pressure storage tank in the system and at this moment, some
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