haier AE122BCAAA (H2EM-18H03) - Manual (Page 24)

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The connecting pipe max length of KRD-32N is 15m, and the max fall between indoor and outdoor unit is 5m;
the connnecting pipe max length of KDR-70N is 50m, the max fall between indoor and outdoor unit is 30m.
The max fall between two indoor units in one system is 10m.
Installation procedure
Connection of pipe
1. Connection of pipe
Connection method
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.
If do not fit the center and screw the
nut hard, the screw thread may be
damaged, which will cause
refrigerant leakage.
2.The additional charging amount of refrigerant
The additional charging of refrigerant (R22) should be complied with the installation manual
of outdoor unit. It must use measurer to quantificationally charge. The a dditional 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.Leakage detection
Use leakage detector or soap water to check if the connected part of the
connection pipe and the valve cap leak.
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 C.
The connected part of indoor unit connection pipe should be thermal insulated.
3. For discharging, please refer to outdoor unit
The cut upward
Indoor unit
Accessorial thermal insulation pipe
On-site connection pipe side
(Attached Figure)
Joint Nut
Spanner
Spanner