Installation procedure | Connection of pipe |
1. Connection of pipe**
For the specific max length and the max fall of connection pipe, please refer to the manual of outdoor unit.
In order to guarantee the efficiency, the pipe should be as short as possible.
Daub the refrigerant oil on the joint and the flared nut.
When bending the pipes, give the roundness as large as possible, to avoid crashing the pipes. 
To connect the pipe, fit the center and use hand to screw the nut, then use spanner to tighten the nut, as shown in figure.
Pay attention not to let alien matters, such as sand, vapor get into the pipe.
The connection of indoor unit pipe must be performed by using two spanners.
2. Dimension of connection pipe
Joint Nut
Spanner
Spanner
If do not fit the center and screw the nut hard, the screw thread may be damaged, which will cause refrigerant leakage.
Pipe diameter | Fasten torque | |
Liquid pipe | 9.52mm | 32.7~39.9 N.m |
Gas pipe | 15.88mm | 61.8~74.5 N.m |
3. The additional charging amount of refrigerant
The additional charging of refrigerant (R407C) should be complied with the installation manual of outdoor unit. It must use measurer to quantificationally charge. The additional charging amount must be complied with the specified amount.
Requirements: Both excessive charging and less charging of refrigerant will cause the compressor trouble. It must be complied with the specified amount.
4.Discharging of pipe
**For details, please refer to the pipe installation part in the manual of outdoor unit.
5.Leakage detection
Use leakage detector or soap water to check if the connected part of the connection pipe and the valve cap leak.
6.Thermal insulation treatment
The thermal insulation of connection pipe should be performed at both gas side and liquid side. In COOLING, both liquid side and gas side are in low temperature, in order to prevent dew from forming, thermal insulation should be done.
The thermal insulation material at the gas side must use the material with the heat resistant temperature over 120*.
The connected parts of indoor unit connection pipe should be thermal insulated.
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