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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.
Qualification Requirements of Installer
Relevant qualification certificate must be obtained as per national laws and regulations.
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.
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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1)
Fixation
The support of the outdoor unit shall be fixed onto the wall surface, and then the outdoor unit shall be fixed onto
the support horizontally. In case the outdoor unit is wall-mounted or roof-mounted, the support shall be firmly
fixed, to avoid the damage of strong wind.
2)
Installation of connecting pipes
The cone of the connecting pipes shall be aligned with the conical surface of corresponding valve connector.
The nut of connecting pipes shall be installed at a proper position and then be tightened with a spanner. Excessive
tightening torque shall be avoided, or otherwise the nut may be damaged.
Vacuumizing
A digital vacuum gauge shall be connected for vacuumizing. The duration of vacuumizing shall be at least 15
minutes, and the pressure of the vacuum gauge shall be below 60Pa.Afterwards, the vacuumizing equipment shall
be closed, and whether the reading of the digital vacuum gauge is increased or not shall be observed after the
pressure is maintained for 5 minutes. In case no leakage is identified, the two-way stop valve and three-way stop
valve of the outdoor unit may be opened. Finally, the vacuumizing hose connected to the outdoor unit can be
disassembled.
Leak Detection
The joint of connecting pipes for the outdoor unit shall be subject to leak detection with soap bubble or
dedicated leak detection equipment.
Post-installation Inspection Items and Test Run
Post-installation Inspection Items
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uence of Improper Installation
Whether the installation is firm or not
The unit may fall, vibrate or make a noise
Whether the inspection on air leakage is completed The refrigerating capacity (heating capacity) may be
insufficient
Whether the unit is fully insulated
Condensation or drip may occur
Whether the drainage is smooth or not
Condensation or drip may occur
Whether the power voltage is identical to that
Failure may occur or the parts may be burned
marked on the nameplate
Whether the circuit and pipeline are installed
Failure may occur or the parts may be burned
correctly
Whether the unit is safely earthed
Electric leakage may occur
Whether the type of wire is in line with relevant
Failure may occur or the parts may be burned
regulations
Whether barriers are identified at the air inlet/outlet
The refrigerating capacity (heating capacity) may be
of the indoor/outdoor unit
insufficient
Whether the length of refrigerant pipes and the
The refrigerant amount charged cannot be confirmed
refrigerant amount charged are recorded
Test Run
1.
Preparations
(1)
Power on is not allowed before all the installation operations are completed and before the leak
detection is proven qualified.
(2)
The control circuit shall be connected correctly and all the wires shall be firmly connected.
(3) The two-way stop valve and three-way stop valve shall be opened.
(4)
All the scattered articles (especially the metal filing and thread residue) shall be removed from the unit
body.
2.
Methods
(1) Switch on the power supply and press the "ON/OFF" on the remote controller, after which the air
conditioner will start operating.
(2) Press "Mode" to select refrigeration, heating and sweeping wind, and observe whether the air
conditioner is under normal operation.
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Relocation Procedures
Note: in case relocation is required, the joint of evaporator gas/liquid pipes of the indoor unit shall be cut off with
a cutting knife. Connection is only allowed after re-flaring (the same to the outdoor unit).
Maintenance Instructions
Maintenance Precautions
Precautions
For all the faults requiring welding the refrigeration pipelines or components inside the refrigeration system
of R32 refrigerant air conditioners, maintenance at the user's site is never allowed.
For the faults requiring radical disassembly and bending operation of the heat exchanger, such as the
replacement of the outdoor unit chassis and integral disassembly of the condenser, inspection and maintenance at
the user's site are never allowed.
For the faults requiring replacement of the compressor or parts & components of refrigeration system,
maintenance at the user's site is not allowed.
For other faults not involved in the refrigerant container, internal refrigeration pipelines and refrigeration
elements, the maintenance at the user's site is allowed, including the cleaning and dredging of the refrigeration
system requiring no disassembly of refrigeration elements and no welding.
In case replacement of gas/liquid pipes is required during maintenance, the joint of evaporator gas/liquid
pipes of the indoor unit shall be cut off with a cutting knife. Connection is only allowed after re-flaring (the same
to the outdoor unit).
Qualification Requirements of Maintenance Personnel
1.
All the operators or the maintenance personnel involved in refrigerating circuits shall be provided with the
effective certificate issued by an industry-accepted assessment institute, to ensure that they are qualified for safety
disposal of refrigerant as required in the assessment regulations.
2.
The equipment can only be maintained and repaired as per the method recommended by the manufacturer.
In case the assistance from personnel of other disciplines is required, the assistance shall be supervised by the
personnel with qualification certificate involved in flammable refrigerant.
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