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Installation
Connecting the pipe and indoor unit
Remove the copper nut from the indoor unit and insert it onto the unflare pipe before making the fitting,
align the flare side of the connecting pipe with the indoor unit connector, lightly coat the fitting and nut
with refrigerant oil, screw the copper nut onto the indoor unit connector and tighten it (the tightening
torque is shown in the table above).
Connecting the piping and outdoor unit
Follow the instructions for flaring the indoor unit as shown in Fig:
Installing the draining pipe
To ensure that the drained water drains properly, the unit must be tilted towards the bottom of the unit
after installation is complete.
1. The drain hose must be wrapped with thermal insulation to insulate it properly and prevent ice build-
up.
2. The pipe should be installed with a downward slope (>1/1.36) to allow water drainage.
3. The pipe must not be elevated at any point.
Evacuate or flush pipes
Before releasing the refrigerant from the outdoor unit into the pipes and the indoor unit, it is necessary
to ensure that there are no foreign objects, water or non-condensing gas in the refrigeration system. For
this purpose, it is necessary to evacuate or purge the system:
A dedicated R32 refrigerant pump must be used to make the R32 refrigerant vacuum. Before working
on the air conditioner, remove the shut-off valve cap (gas and liquid valves) and be sure to retighten it
afterwards (to avoid possible air leakage).
1. To prevent air leakage and spillage, tighten all connection nuts on all pipes.
2. Connect the shut-off valve, the charging hose, the manifold valve and the vacuum pump.
3. Fully open the manifold valve and apply a vacuum for at least 15 minutes and check that the vacuum
hose
15 minutes and check that the vacuum gauge on the equipment indicates -0.1 MPa(-76cmHg).
4. After applying vacuum, fully open the shut-off valve with a hex spanner.
5. Check that the internal and external connections are free of air leaks.
Adjusting the refrigerant quantity
When the pipe length exceeds 5m, add refrigerant according to the table below:
Refrigerant pipe
Refrigerant pipe
Gas (mm)
Pipe between
9.52x0.75
indoor unit and
12.7x1
outdoor unit
15.88x1
19.05x1
Note:
1. This table is for guidance only.
2. Joints shall not be reused except after re-flaring the pipe.
3. After installation, check that the shut-off valve cover is securely fastened.
4. The pipe thickness is 0.6-1.0, the bearing pressure is 4.2MPa.
5. If the connection pipe is too long, the cooling capacity and stability will decrease. The larger the number of bends, the higher the resistance in the
piping system, which will reduce the cooling and heating capacity and even lead to breakage.
This will reduce the cooling and heating capacity and even lead to compressor breakage. If the height difference between the indoor and outdoor
unit is more than 5m, an oil sump must be installed in the an oil trap must be installed in the gas pipe every 10m.
6. Please add refrigerant according to the liquid piping.
Additional charge (Kg/m)
Liquid (mm)
6.35x0.75
0.033
6.35x0.75
0.03
9.52x0.75
0.05
9.52x0.75
0.05
107
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