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2. Key Points for Construction Inspection
2.1 Arrival of goods and open-case inspection
1. When receiving the machine, check if there is any damage in transportation. If any surface or internal damage is
found, please inform the transportation agency in a written form.
2. After receiving the machine, check if the type, specification and quantity of the machine conform to the contract.
3. When unpacking the product, please keep the Manual well and check all accessories.
2.2 Refrigerant pipe
1. The refrigerant pipe must be installed by the special refrigerant distributor made by our company (purchase).
2. The refrigerant pipe must use the pipe with specified diameter and wall thickness.
3. The welding of the copper pipe must be performed with nitrogen-filled protection. Before welding, the copper
pipe must be filled with the nitrogen of 0.2kgf/cm2. After welding, the nitrogen must be cut off until the copper
pipe is thoroughly cooled down.
4. The refrigerant pipe must be treated with thermal insulation.
5. After the refrigerant pipe is installed and before the air tightness test and vacuumization are performed, the
indoor unit cannot be power-on.
2.3 Air tightness test
After the refrigerant pipe is installed, nitrogen of 40kgf/cm² (4.0MPa) must be filled from the gas side and liquid side
simultaneously for 24-hour air tightness test.
2.4 Vacuumizing
After the air tightness test, vacuumization (-0.1MPa) must be performed from both the gas side and the liquid side
simultaneously.
2.5 Refilling of refrigerant
1. The refilling volume of refrigerant is calculated by the diameter and length (actual length) of the pipe at the liquid
sides of the indoor and air-conditioning units.
2. The refilling volume of refrigerant, diameter and length (actual length) of liquid pipe, and height difference of the
indoor and air-conditioning units shall be recorded into the use confirmation table of the air-conditioning unit (on
the cover plate of electronic control box) for future reference.
2.6 Electrical wiring
1. The power supply capacity and wire diameter shall be selected according to the design manual. Generally, the
power line of the air conditioner is thicker than that of the motor.
2. To prevent misoperation of the air-conditioner, don't interlace or wind the power line (220-240V-/380V 3N-) with
the connecting wires (low-voltage wires) of the indoor and air-conditioning units.
3. The indoor unit is power-on after air tightness test and vacuumization.
2.7 Trial Run
1. Trial run cannot be performed until the air-conditioning unit is power-on for more than 12 hours, or the system
may be damaged.
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