30% of the quality of the multi-connected air conditioning system is in the manufacturer of the air conditioner, and 70% is in the installation, which can be seen that the proportion of the installation in the entire air conditioning system is very important. Although each manufacturer carries out strict quality control of the product when leaving the factory, due to the specific responsibility of many equipment agents or installers, there is a lack of strict and unified specifications and standards in the construction fashion, and complaints about product quality often arise. The following summarizes the details that are commonly overlooked during the construction of multi-online installation to correct installation and precautions.
The indoor unit is fixed with double nuts under hoisting;
The screw rod should not be less than ¢10mm, the screw rod should be kept vertical, and the length of the screw rod should be unified in the middle position of the machine.
The indoor unit is installed horizontally within 1°± the indoor unit has enough space for air supply and return, the indoor unit has enough space for repair and maintenance, the indoor unit should be protected in a timely and all-round way after hoisting, and the size of the maintenance port should be more than 400×400mm;
The outdoor unit is installed horizontally within 1°± The outdoor unit should ensure sufficient space for heat dissipation, the noise of the outdoor unit should not affect the user or others, and the outdoor unit should have enough maintenance space;
The height of the foundation of the outdoor unit is more than 200mm, the foundation of the outdoor unit is equipped with a shockproof pad, the thickness of the shockproof pad is not less than 10mm, and the installation position of the outdoor unit is convenient for drainage.
When the refrigerant pipe passes through the floor slab, the waterproof construction work should be done; when the refrigerant pipe passes through the roof rainproof house, it should cooperate closely with the civil engineering to do a good job of waterproof construction work; after the refrigerant pipe penetrates, the outdoor side should have a certain downward slope to prevent water backflow;
The length of the casing pipe is equal to the thickness of the wall after decoration; The gaps in the casing should be filled with flame retardant materials;
PVC casing should not be used for shear walls and fire prevention requirements, refrigerant pipes and drainage pipes should be protected by casing through the wall, and the gaps in the casing should be filled with flame retardant materials;
Determine the direction and positioning of the refrigerant pipe and drainage pipe, and install the fixed code before installing the refrigerant pipe and drainage pipe;
The fixed code interval of refrigerant pipe and drainage pipe should be uniform and beautiful, and the fixed spacing should be within the technical requirements of Daikin;
The fixed interval of the refrigerant tube should be 1.2~1.5m/piece;
The refrigerant tube should be fixed at 300~500mm when it is connected to the indoor unit;
The turning place of the refrigerant tube should be fixed;
The fixed spacing of drainage pipe is 0.8~1.0m/piece;
The drainage pipe should be fixed at 300~500mm connected to the indoor unit;
The horizontal pipe section of the condensate drainage lifting should be fixed;
The fixed code interval of the riser is 1.2-1.5m/piece, the riser should be fixed at 300~500mm turn, and the fixed code of the fixed refrigerant pipe should be a thermal insulation material;
The fixed interval of outdoor refrigerant pipe should be 1.2~1.5m/piece;
The refrigerant tube should be sealed and protected before the equipment is connected, and the refrigerant tube for more than three months should be brazed and sealed if it is not installed;
Use a suitable flarer, file the cutting surface of the refrigerant tube to remove the inner and outer burrs, and the inner surface of the flaring is smooth and clean without scars;
Use a suitable pipe expander, file the cutting surface of the refrigerant tube to remove the inner and outer burrs, the refrigerant tube sleeve should be tight, and the outer surface of the refrigerant tube should be clean during welding;
Use a suitable pipe bender, the outer surface of the bent refrigerant tube should be free of wrinkles, the deformation of the elbow surface of the refrigerant tube should not exceed one-third of the cross-sectional area, and the angle of the bend should not exceed 90 degrees;
※Use a torque wrench, apply ether oil at the bell mouth, tighten with appropriate torque, and test and ensure no leakage by nitrogen filling pressure test;
The nitrogen pressure is 0.02MPa, the nitrogen filling pressure can be adjusted according to the size of the refrigerant tube and the length of the distance.
The outer surface of the brazing refrigerant tube should be clean; The outer solder of the brazing place just fills the joint, the inner wall of the refrigerant tube is not oxidized, and the solder on the inner wall of the refrigerant tube just fills the seam;
The installation of divergent pipes should be: 1. Horizontal installation, deviation ± 30° (different brands), straight pipes should be greater than 500mm before turning before divergent pipes, and straight pipes should be greater than 1000mm between divergent pipes and divergent pipes;
The divergence pipe connected between the outdoor unit and the outdoor unit should be: 1. Horizontal installation, deviation ± 15°; The front end of the divergent pipe should be greater than 500mm straight pipe before turning, and the straight pipe between the divergent pipe and the divergent pipe should be greater than 1000mm;
The condensate drainage lifting installation shall:
(1) The drainage hose that comes with it should be installed horizontally, and the length of the horizontal pipe should be less than 300mm;
(2) The height of the lifting should be within the technical requirements of each type of Daikin;
(3) The length of the raised transverse pipe section should be less than 150mm;
(4) Access the supervisor at a slope greater than 1/100;
There is enough lifting space to install drainage lifting, and the height of drainage lifting should be within the technical requirements of various models of Daikin;
The indoor unit without the lifting pump is naturally drained, the random drainage hose should be installed horizontally, and the drainage slope of more than 1/100 is guaranteed to be drained;
The drainage of the indoor unit with high static pressure should be made into a trap, and the trap should be installed with a maintenance port;
The vent should be set at the end or middle of the condensate drainage main, the vent should be higher than the drain level of all indoor units in the system, and the vent should be elbowed and the nozzle should be facing down;
When the branch pipes on both sides converge, they should be misplaced to access the main pipe; The condensate drainage main should ensure that the drainage slope is greater than 1/100 or more, and the drainage pipe should be bonded with appropriate glue between the drainage pipe;
The horizontal pipe is connected to the riser, which should be connected with a certain drop, and the drainage backflow should be avoided;
The incut side of the insulation is facing inward; The seams do not need to be bandaged;
Tee insulation, firm paste, beautiful joints, inward;
The random drainage hose and the drainage connection are well insulated and pasted; The insulation material is inserted into the end of the random drainage hose and pasted well;
The insulation material should be pushed to the full contact with the shell of the indoor unit, and the included insulation sleeve should be wrapped. The size of the cable tie is consistent with the insulation material, and the tightening force of the cable tie is uniform, and the appearance is beautiful;
The insulation pipe is pushed until it is in full contact with the shell of the indoor unit, and the outer surface of the insulation at the nut should be wrapped with a length of 100mm, and it is well pasted with glue;
Before the pressure test of the refrigerant system, vacuum operation should be carried out;
The vacuum degree of the refrigerant tube reaches -0.1Mpa (-1kgf/cm2);
Before connecting the outdoor unit, the pressure test pressure is 4.0Mpa (40kgf/cm2), not more than 4.0Mpa (40kgf/cm2), and it is consistent to keep it for more than 24 hours without leakage; Simultaneous pressure test of liquid tube and trachea is used;
The communication line of commercial VRV series should use 0.75-1.25mm² double-core sheathed wire, and after the wiring is connected to the terminal board, there can be no exposed part, and the wires, cables and electrical accessories selected in the installation of electrical equipment must use products that have passed the national compulsory certification.