Installation Instructions - Haier 1U71S2SG1FA Service Manual

10. Installation Instructions

• Installation Precautions
＊ The area of the room in which R32 refrigerant air conditioner is installed cannot be less than the minimum area
specified in the table below, to avoid potential safety problems due to out-of-limit of refrigerant concentration inside
the room caused used by leakage of refrigerant from reigeration system of the indoor unit.
＊ Once the horn mouth of connecting lines is fastenedit may not be used again (the air tightness may be affected).
＊ whole connector wire shall be used for indoor/outdoor unit as required in the operation specification of installation
process and operation instructions.
• 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..8oth 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 afterwiring 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.
WARNING
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