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If do not fit the center and screw the nut
hard, the screw thread may be damaged,
which will cause refrigerant leakage.
Joint
Nut
Spanner
2. Dimension of connection pipe
Fasten torque
32.7~39.9 N.m
Pipe diameter
97.2~118.6 N.m
Gas pipe 19.05mm
Liquid pipe 9.52mm
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.
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 part of indoor unit connection pipe should be thermal insulated.
1. Connection of pipe
Connection method
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 s-
panner 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.
4.Vacuumizing
Use vacuum pump to perform vacuumizing through the stop valve of outdoor
unit.
It is strictly prohibited to use the refrigerant sealed in the outdoor unit to
perform air discharging.
Installation procedure
Connection of pipe
27
Spanner