Haier 5U125S2PN1FA Installation Manual page 7

Electrical Safety Requirements
1.The surrounding conditions (ambient temperature, direct sunlight and rainwater) shall be noticed during electrical wiring,
with effective protective measures being taken.
2.Copper wire cable in line with local standards shall be used as the power line and connector wire.
3.Both the indoor unit and outdoor unit shall be reliably earthed.
4.Wiring for the outdoor unit shall be made first and then the indoor unit. The air conditioner can only be powered on after
wiring and pipe connection.
5.The dedicated branch circuit must be used, and leakage protector with sufficient capacity must be installed.
Qualification Requirements of Installer
Relevant qualification certificate must be obtained as per national laws and regulations.
Indoor Unit Installation
1.Fixing of wall panel and piping layout
In case of left/right water pipe connection for the indoor unit, or in case the evaporator interface of the indoor unit and the horn
mouth of the connecting piping cannot be extended to the outdoor side for installation, the connector pipes shall be connected
to the evaporator piping interface of the indoor unit in the process of horn mouth.
2. Piping layout
During layout of connecting pipes, drain hose and connector wires, the drain hose and connecting wire shall be placed at the
bottom and top respectively. The power line cannot be twined with the connector wire. The drain pipes (especially inside the
room and machine) must be winded with thermal insulation materials.
3. Nitrogen charging for pressure maintaining and leak detection
After the evaporator of the indoor unit is connected to the connector pipe (after welding), nitrogen more than 4.0MPa
shall be charged inside the evaporator and the piping connected to evaporator with a nitrogen cylinder(adjusted by a reducing
valve). Afterwards, the valve of the nitrogen cylinder shall be closed, for leak detection with soapy water or leak detecting
solution. The pressure shall be maintained for more than 5 minutes, and then whether the system pressure is reduced or not
shall be observed. In case the pressure is reduced, leakage can be identified. After the leak point is handled, the steps above
shall be repeated.
After the evaporator of the indoor unit is connected to connecting piping, nitrogen shall be charged for pressure maintaining
and leak detection. Afterwards, the evaporator shall be connected to the two-way stop valve and three-way stop valve of the
outdoor unit. After the copper cap of the connecting piping is fastened, nitrogen more than 4.0MPa shall be charged at the
access hole of the three-way stop valve with a charging hose. The valve of the nitrogen cylinder shall be closed, for leak
detection with soapy water or leak detecting solution. The pressure shall be maintained for more than 5 minutes, and then
whether the system pressure is reduced or not shall be observed. In case the pressure is reduced, leakage can be identified.
After the leak point is handled, the steps above shall be repeated.
The next step (vacuumizing with a vacuum pump) can only be continued after the installation steps (nitrogen charging for
pressure maintaining and leak detection normal) are completed.
Outdoor Unit Installation
1.Fixing and connection
Note:
a) Fire source shall be avoided within 3m around the place of installation.
b) The leak detection equipment of refrigerant shall be placed at a low position in the
outdoor, and shall be opened.
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