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.
Spanner
Use leakage detector or soap water to check if the connected part of the connection pipe and the valve cap leak.
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.0010571570, AB212BCBAA specifications
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