haier AB422BCBAA - Manual (Page 35)

Installation procedure
Connection of pipe
The attentive matters in connection of pipe
5.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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**Connection method
*** Daub the refrigerant oil on the joint and the flared nut.
*** When bending the pipes, give the roundness as large as possible.
*** 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, get into the pipe.
2. 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.
3.Vacuumizing
Use vacuum pump to vacuumize from the stop valve of the outdoor uin.
It is strictly prohibited to use the refrigerant sealed in the outdoor unit to perform air
discharging.
4.Leakage detection
Use leakage detector or soap water to check if the connected part of the connection
pipe and the valve cap leak.
In order to guarantee the efficiency, the
pipe should be as short as possible.
Do not make the connection pipe distorted and deformed.
Do not let dust enter into pipe.
When bending the pipes, give the roundness as large as possible.
Both gas pipe and liquid pipe should be thermal insulated.
There should be no leakage at the flare parts.
Joint Nut
Spanner
Spanner
Fasten torque
32.7~39.9
Pipe diameter
97.2~118.6
1. Connection of pipe
** The max length of connection pipe is 50m, the max fall is 30m.
Gas pipe 19.05mm
Liquid pipe 9.52mm
If do not fit the center and screw the nut
hard, the screw thread may be damaged,
which will cause refrigerant leakage.