First of all, the on-site materials should be stacked neatly and in an orderly manner, and both ends must be sealed to ensure cleanliness. Copper pipes should be placed on a shelf that is ventilated and dry and 300 mm higher than the ground. 2. Outdoor unit installation 1. Choose

First of all, the on-site materials should be stacked neatly and in an orderly manner, and both ends must be sealed to ensure cleanliness. Copper pipes should be placed on a shelf that is ventilated and dry and 300 mm higher than the ground

2. Outdoor unit installation

1. Selection of outdoor unit installation location

1. Air-conditioning outdoor unit must be more than one meter away from the wall to ensure heat dissipation and have sufficient maintenance space

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The foundation must be made according to the installation size of the equipment and has sufficient bearing capacity. The foundation must be horizontal

3. When the outdoor unit is in place

0 When hoisting the outdoor unit, please keep the machine level and add soft pads to the contact between the body and the suspended rope to avoid wear or scratching the machine

The outdoor unit should place shock absorbing pad at the installation hole and stress point in contact with the foundation, and fix

with nuts. Install

1, hang code production and select

1 according to the lifting height of the indoor unit and the floor height, determine the length of hanger boom , and then discharge

Use an infrared locator to determine the installation position of the indoor unit hanger, make marks, drill holes with electric drill

The lifting position of the indoor unit should ensure that the air conditioner condensate can be discharged, the air duct can be installed easily, and the air supply is smooth. All threaded booms must be used. The indoor unit must be fixed with double nuts to ensure that the machine is suspended firmly.

After the indoor unit is lifted, it is necessary to adjust the level

The throttling element must be installed vertically and horizontally, and it is strictly forbidden to tilt or invert. Pay attention to the connection direction when connecting

Indoor unit is wrapped with a dust cover to prevent a large amount of dust from entering the machine and affecting the operation effect of the machine

Ensure that there is enough installation and maintenance space around the indoor unit, and reasonably send back air and air flow

4. The structure of refrigerant pipeline

1. Bracket installation

The distance between the rack should not be too large, and the installed brackets must be arranged neatly

2. Laying and installation of refrigerant pipelines

Use Cutting machine Cutting machine Cutting machine

Clear burrs in ports and copper tube fragments in pipes

3. Protection of refrigerant pipelines

If the pipeline cannot be connected to the internal and external machines in time, it must be sealed to prevent dust and moisture from invading; when the pipeline penetrates the wall, a sleeve should be added in time for sealing and protection

4. Installation of branch pipes

Branch pipes cannot be replaced by tees, and can only be installed horizontally or vertically. The horizontal straight pipe section between the copper pipe elbow and the adjacent branch pipe is 1M; the horizontal distance between the two adjacent branch pipes is 1M; the horizontal straight pipe section distance between the branch pipe behind the branch pipe is 0.5m

5. The expansion pipe connection

0 The refrigerant pipeline with the diameter of the copper pipe must be connected with a flared pipe. It is strictly forbidden to connect the flared horn with a flared horn with a flared horn with a flared horn. It is strictly forbidden to use a flared horn with a flared horn with a flared horn. The pipe mouth should be flat and without burrs, and the trumpet should be free of deformation and cracks. The connection of

nuts must be made using two movable wrenches

7. Nitrogen filling welding of refrigerant pipelines

To ensure construction safety, nitrogen cylinder should be connected to pressure reducing valve . During welding, the pressure of nitrogen should be controlled at 0.2-0. 3 kPascal/CM2

Determine the nitrogen path, insert the nitrogen pipe into the inlet of the refrigerant pipe to be welded and seal it, open the nitrogen cylinder valve, adjust the nitrogen flow through the pressure reducing valve, and finally weld

8. Refrigerant Pipe airtightness test

Connect the gas-liquid pipeline together, lead out a connection pressure gauge, seal and weld the interface. R22 is pressurized with 28 kg/cm2 nitrogen (R410A system uses 40 kg/CM2). Pay attention to the pressure correction before and after the pressure test. There will be a pressure change of 0.1 kJ/CM2 every 1 second. The temperature during the pressure test and the confirmed temperature should be recorded. The refrigerant pipeline is blown dirty. In principle, dust is blown from top to bottom or horizontally, and dust is blown at a pressure of 5 kg/CM2 to ensure that there are no impurities in the system.

uses the following method to discharge sewage:

A. Fix the appropriate blocking material on the gas side of the indoor unit to the nozzle of the main pipe;

b. Gradually pressurize the pipe with nitrogen. Suddenly, r

For indoor units with large negative pressure on the drain port of the water tray, the drain pipe must be water storage bend head. After the installation is completed, the water filling test must be done. 6. The insulation of the pipeline system installation of

refrigerant pipelines should be equipped with closed-cell foam insulation material, the flame retardant grade is B1, and the heat resistance exceeds 120. When the outer diameter of the copper tube DD12.7mm, the thickness of the insulation layer is greater than 15mm; when the outer diameter of the copper tube D is greater than D15.88MM, the thickness of the insulation layer is greater than 20mm.

condensate pipe should be heat-retardant B1 rubber and plastic insulation pipe, and the thickness of the insulation layer is generally 10 mm.

pipe wall must have a casing

7. Installation of signal line

special power supply line must be set up, and the allowable fluctuation range of the power supply voltage is 10% of the rated voltage; the power supply capacity must be sufficient, the cable diameter meets the requirements, and there is a corresponding circuit breaker protection device; the grounding system must be reliable, such as lightning protection when the air conditioner is installed on the top of the building; the signal line must use a three-core shielding wire, and the shielding layer of the signal line must be connected to the grounding of the metal plate of the electronic control box.

8. Vacuum drying

must simultaneously evacuate from both sides of gas and liquid. vacuum pump limit vacuum degree should reach 756MMHG or less, and the displacement should reach 4 liters/second or more; the vacuum pump used in the R410A system must add check valve , or a vacuum pump with a check valve must be used.

9. Add refrigerant

According to the actual liquid tube size and length, calculate the amount of refrigerant added through the formula, and record the amount of refrigerant added in the outdoor mechanism refrigerant addition table; do not estimate the amount of refrigerant by measuring the working current and pressure.

X. Test drive

Confirm whether the connection number of the indoor unit is consistent with the number displayed on the outdoor unit digital tube; start and run, check whether the drainage is unobstructed, whether the indoor electromechanical control board is faulty, and whether the unit operation current and inlet and outlet air temperature are within the allowable range.

Top ten prohibitions on multi-line engineering installation

First, it is prohibited to supply power to a unified indoor unit in a unified system.

2. It is strictly forbidden to use carbon tetrachloride to clean the pipeline.

3. Welding of pipelines without nitrogen protection is prohibited.

4. It is prohibited to install indoor and outdoor unit branch pipes in a level manner.

5. It is prohibited to use "copper-aluminum connection pipe" instead of copper pipes in the installation of air conditioning systems.

6. It is strictly forbidden to insulate the gas and liquid pipes together.

7. It is prohibited to install external units in places with poor wind.

8. It is strictly forbidden to install multiple online places such as computer rooms.

9. It is strictly forbidden to tie the control line (communication line) and the power line (high voltage).

10. It is strictly forbidden to select cables according to the wire diameter required by the technical manual.