Haier 1U71S2SR2FA, Installation Manual

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Electrical Safety Requirements

Note:  
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.

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Qualification Requirements of Installer

Relevant qualification certificate must be obtained as per national laws and regulations.  

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Indoor Unit Installation

1.

Fixation 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 operation above can also be completed after the indoor unit is connected to the connecting pipelines and 

the two-way stop valve and three-way stop valve of the outdoor unit, after the access hole of the outdoor unit is 
connected to the nitrogen cylinder and pressure gauge and after more than 4.0MPa nitrogen is charged. No leak 
points are identified in the leak detection at the joint/welding junction of the indoor unit and at the joint of 
connecting pipelines of the two-way stop valve and three-way stop valve of the outdoor unit. It must be 
guaranteed that each joint is available for leak detection during installation.  

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. 

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Outdoor Unit Installation

1.

Fixation 

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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