Shenzhen Envicool Technology Co., Ltd.
5、The pressure leakage inspection and vacuum-pumping operation are passed, then proceed
the next step(such as: the refrigeration line for support, and the refrigerant pipes shall be
isolated from the building with the vibration-proof isolation frame.).
6、The above operations of each step, shall be based on industry general operation standard.
When the unit leaves the factory, the indoor unit has been charged with a certain amount of
refrigerant, and the outdoor unit has been charged with some nitrogen. The actual filling
volume of the system is judged according to the degree of subcooling of the liquid pipe through
debugging on site. The subcooling degree of the liquid pipe is equal to the difference between
the saturation temperature of the refrigerant corresponding to the pressure before the electronic
expansion valve (which can be indicated on the pressure gauge) and the temperature of the
liquid pipe before the electronic expansion valve. The subcooling degree of the liquid pipe
should generally be controlled within the range of 5~8K. If the charging amount is too large,
the liquid pipe subcooling degree will be too large, on the contrary, if the charging amount is
too small, the liquid pipe subcooling degree will be lower. The subcooling degree of the liquid
pipe is the best way to judge the filling amount on site.
If the connecting pipeline between the indoor and outdoor units exceeds 5m, refrigerant needs
to be added to the system to make the system operate normally.
The amount of refrigerant added is carried out in accordance with the above-mentioned
method of detecting the degree of subcooling of the liquid pipe.
1. After the project is connected, the pre-charged refrigerant needs to be charged from the
condenser side of the outdoor unit before starting up;
2. Additional refrigerant needs to be injected from the low pressure side after starting up.
3. Part of the external machine must be filled with nitrogen before welding. The internal
nitrogen must be evacuated.
2.5.4 Add refrigerating oil
If the connecting pipeline between the indoor and outdoor units exceeds a certain length,
it is necessary to add refrigerant to the system. The addition of refrigerant will cause the
original refrigerating oil in the system to be diluted and affect the lubrication and
cooling effect of the refrigerating oil. After charging the refrigerant, it is necessary to
replenish the refrigerating oil. The additional formula is as follows:
The system needs to add additional amount of refrigerating oil (ml) = added
amount of refrigerant × 15ml
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