DC Inverter Air
8.3. Precautions for Installation:
3.1 Installation
Confirm the model, name and specification to avoid the faulty installation.
3.2 Refrigerant Piping
A. The refrigerant piping must adopt the pipe diameter specified; B.
The refrigerant piping must be subject to insulation treatment;
C. It is necessary to inject the nitrogen of certain pressure into the refrigerant pipes before welding the pipes;
D. The indoor unit cannot be energized before the airtight test and vacuum pumping operation after
completing the installation of refrigerant piping. If it has been energized, the airtight test and vacuum
pumping operation must be carried out to the pipes at gas side and liquid side.
3.3. Airtight Test
The refrigerant piping must be subject to the air‐tight test and the test pressure of R410A system is
40.0kgf/cm
2
.
3.4. Vacuum Pumping Operation/Evacuation
The evacuation of refrigerant piping must use the vacuum pump and it shall be simultaneously carried out
from both gas side and liquid side.
3.5. Adding of Refrigerant
A. The adding amount of refrigerant for each outdoor unit for excessive standard piping length shall be
determined according to the piping size and specification.
B. The data of refrigerant adding amount, piping length and height difference of indoor/outdoor units shall
be recorded and properly stored for backup.
3.6 Electrical Wiring
A. The diameter of power capacitor cables and power cables shall be selected according to the design manual, and the
diameter of air‐condition power cord shall be greater than the power cord of the common motor;
B. In order to prevent the misuse of the air conditioner, it is necessary to make sure of no staggering and winding of power
cord with the connection line of the indoor unit (low‐voltage line);
C. The indoor unit shall be energized after the airtight test and the vacuum pumping operation (Evacuation).
3.7 Trial Run
The trial run cannot be performed unless the outdoor unit has been energized for over 12 hours.
8.4. Installation of Refrigerant Pipes
1. Selection of Refrigerant Copper Tubes
1) The refrigerant pipes must use the specified diameter;
2) The refrigerant pipes must be subject to the insulation treatment and the copper tube for R410A system
must be subject to the oil‐removing treatment;
3) The withstand pressure copper tube: R410A:≥46kgf/cm
2
;
4) The R410A system requires that the impurities in copper tube shall be ﹤30mg/10m.
2. Material Protection of Refrigerant Pipes
1) The end of each pipe must be wrapped and capped. The “tightening” is the most effective method.
However, “binding” is the simple alternative method used for certain working area.
A. Tightening Method
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