What is the installation method of commercial central air conditioning?

What is the construction and installation process of commercial central air conditioning? The general sequence of central air-conditioning engineering construction is: construction preparation → coordination with civil engineering reservation and embedment → fabrication of pipeline supports and hangers → inspection of equipment and accessories → installation of equipment and pipelines → experiment of pipeline system → anticorrosion and thermal insulation → system flushing → system debugging. Matters needing attention in each process are summarized as follows:

1. Construction preparation

As the saying goes, "Before the soldiers and horses move, grain and grass come first", construction preparation is a very critical process and the basis of subsequent processes. In fact, the construction preparation stage is the busiest time for the project manager. In addition to fully studying contracts, drawings and other documents and making a good construction organization plan, it is also necessary to communicate and coordinate with all parties to solve the following problems: (1) water and electricity for construction; Location of living quarters and domestic water and electricity consumption; Material stacking position (not only close to the construction site, but also can't affect other professional construction); Warehouse location (for stacking tools, valves and other auxiliary materials); Material planning (there must be a certain margin, because each project will have scraps, so it can't be prepared according to the size on the drawing, and the pipe fittings with large demand should be planned on the basis of the drawing); Material procurement and determine the time of material entry; Prepare materials before commencement (technical document submission form, commencement report, safety technical disclosure, etc.). ); Educate workers on safe construction; Prepare tools; Workers of special types (such as welders and electricians) should hold relevant certificates. In a word, construction preparation is a very complicated work, and many problems need to be considered.

2. Cooperate with civil reserved and embedded.

In the early stage of civil construction, we must pay attention to cooperate with civil engineering to reserve and embed. Casing embedding must be done at the place where the pipeline enters and exits the building. Especially the reserved holes in shear walls are very important. After the completion of most civil works, it is not allowed to open holes in the shear wall without permission. If the computer room is in the basement, it is necessary to pay more attention to the construction of the civil contractor to avoid the situation that the equipment in the computer room has not yet arrived in the computer room and the lifting hole has been closed.

3. Manufacture and installation of pipe supports and hangers

The material and model of supports and hangers must be selected according to the specification requirements, because it involves safety issues and is also the most concerned place for supervisors. After the materials arrive, please prepare the materials first and ask the supervisor to sign for inspection; Before the installation of supports and hangers, rust must be removed before painting; When installing supports and hangers, especially in the main engine room, we should pay attention to several problems: try to make supports and hangers for pipes exceeding dn200 to avoid affecting the building structure; Install the hanger on the beam as far as possible, and don't hit the top, so that the hanger bears shear force instead of tension; Whether it is a bracket or a hanger, the cross arm should not be too long, so as to avoid sagging of the span and soft deformation of the main engine or the inlet and outlet of the water pump.

4. Inspection of equipment and accessories

Equipment and accessories inspection is to ensure the reliability of the system and avoid unnecessary problems during operation. After the arrival of the equipment, the equipment shall be unpacked in the presence of the supervisor, and the information brought with the box shall be properly kept; The live equipment shall be put into single-machine trial operation; Valves should be sampled and pressure tested, especially the valves in key parts, such as the bypass valve between the water collector and the water separator, the bypass valve between the inlet and outlet of the main engine, and the switching valve in winter and summer.

5. Pipeline installation

Whether the project is done well depends on whether the pipeline installation is standardized and reasonable. Pipeline installation in the main engine room should follow the principles of thick pipe below, thin pipe above, small pipe giving way to large pipe, pressure pipe giving way to non-pressure pipe. Before pipeline installation, derusting and painting should be carried out first; When connecting pipes, except for flanges and places that are not easy to be welded to death, other places should be lit first as far as possible, and finally welded by skilled welders. This can not only make the pipeline beautiful, but also avoid excessive leakage during pressing due to uneven welder skills. The inlet and outlet valves of the main engine and the water pump should be in a horizontal line as far as possible, and the valve handle should be in a position convenient for operation. When installing drain valves at the inlet and outlet of the main engine and the water pump, they should also be installed in a line, which is beneficial to the drainage ditch. Automatic exhaust valve should be installed at the highest point of each pipeline to avoid gas accumulation in the pipeline and affect the waterway circulation. When there is a cooling demand, an anticorrosive wood bracket should be added between the pipeline and the support and hanger to avoid cold bridge and condensed water on the support and hanger. When installing pipelines, many valves need to be bolted. When installing bolts, all plane elastic gaskets should be installed to avoid pipeline vibration and water leakage caused by long-term nut loosening. If it is necessary to install the compensator on the pipeline, it should be noted that both ends of the compensator should be fixed with brackets, so that the compensator can only expand and contract back and forth, and cannot be staggered up and down.

6. Pipeline system experiment

Pipeline system experiment is an important process that can't deceive oneself even without supervision. When doing the pipeline leak test, we should not only observe the pressure gauge, but also carefully check whether there is water seepage at the welded joint and threaded joint. It is best to touch the place that is not clear with your hands. Because there is a little water seepage at the interface, the pressure of the pressure gauge has not changed obviously, but these small water seepage can damage the ceiling for a long time. It is also essential for the irrigation test of condensate pipeline. Although it is common sense that condensate pipes cannot have reverse slopes, they often make mistakes in many projects.

7. Anti-corrosion and heat insulation

After the pipeline experiment, anti-corrosion and heat preservation began. Thermal insulation materials are generally made of rubber and plastic. Insulation thickness should be selected according to the requirements of drawings, and insulation pipes and pipes must be of the same model. If there is a gap between the insulation pipe and the pipeline, condensed water will exist in the insulation pipe for a long time, resulting in cracking and leakage of the insulation pipe. When installing the pipeline, try to put on a suitable complete insulation pipe and leave a connection port, which can not only speed up the construction, save insulation glue and tape, but also reduce the connection and leakage of insulation pipe.

8. System flushing and debugging

When cleaning the pipeline, the inlet and outlet valves of the main engine must be closed, the bypass should be opened, and the whole circulation should be carried out after water filling, and it should be discharged after 10 minutes; Repeat several times until the discharged water is not turbid and has no foam; Then open the filter and clean the screen.

When debugging the system, full-time debugging personnel should check whether the circuit is correct and whether the valve is opened correctly, then start the make-up pump first, inject water into the system, start the submersible pump and system circulating pump, and finally start the main engine for debugging. The above steps are the whole construction and installation process of commercial central air conditioning imported from Bianxiao, Yiliang, Henan.