The air duct mainly refers to the ventilation duct of the central air conditioning system, which is often ignored but it is an important part of the air conditioning system. Then, what common problems will we encounter when installing the air duct? How to solve them? Let's take a look.
What are the common problems with duct installation?
1. Material does not meet quality requirements
This kind of problem is quite a headache. If the material does not meet the requirements, the air duct will leak when the system is running, resulting in the loss of air conditioning load and affecting the service life of the air duct.
2. Duct noise
The cause of this phenomenon may be the uneven surface and thickness of the plate, obvious indentation, crack, sand hole, scar and rust, etc., or the air duct plane sinks, the side bulges outwards, and obvious deformation.
3. The angle of air duct warping, twisting and the angle of elbow are not correct
This is due to the inaccurate setting out of slab cutting; the two air ducts are parallel, and the length and width of the slab on the opposite side are not equal; the width of the undercut at the four corners of the air duct is not equal; the location of the undercut joint is not correct, and the strength of the manual undercut joint is not the same; no corresponding reinforcement measures have been taken. In this case, the relative plane of the rectangular air duct is not parallel, and the two ends are not parallel; the angle is not straight; the diagonal is not equal; and the undercut is not strict. The final direct result is that the air duct connection will be uneven in stress, the installed air duct is not straight, the flange gasket is not tight, the system leaks air, resulting in air conditioning load loss, and shortening the service life.
Solutions for duct installation:
1. Quality inspection of materials before installation
Carefully measure the thickness of the steel plate. Before installing the air duct, be sure to check the factory certificate and material quality certificate of the materials, then check the appearance of the materials, and then measure the thickness of the steel plate. Prevent rework due to non-conforming materials.
2. Safety of hoisting
The hoisting of clean air duct is the same as that of ordinary air duct, and the suspender, cross arm, expansion bolt, underlay of thermal insulation air duct, etc. are required to meet the relevant specifications and quality acceptance standards.
3. Pay attention to unfolding the blanking steps
The construction personnel shall strictly check the sheet metal, and control the length, width and diagonal of each sheet metal to make their deviation within the allowable range; for the sheet metal after blanking, the two sheets on the opposite side of the air duct shall be overlapped to check the accuracy of the size; the pre reserved size of the sheet metal undercut must be correct to ensure the same undercut width; The seaming joint is set at the four corners. When the seaming joint is made by hand, the center part at both ends of the seaming joint shall be tightened with a wooden hammer first, and then the joint shall be evenly compacted along the whole length.
4. Check the light leakage
After the air duct is assembled on the ground, the light leakage inspection shall be carried out before the heat preservation. According to the site conditions, the light leakage inspection can be carried out according to the internal light leakage or external light leakage. Sealant shall be added at the light leakage place until there is no light leakage.
5. Air leakage test
For the air supply and return main pipe and branch main pipe of the purification system with higher level, besides light leakage inspection, air leakage test shall also be conducted after the ground assembly. For the smaller system, it can be tested after the installation of air duct, and for the larger system, it can be assembled in sections on the ground as much as possible, so that problems can be found and dealt with in time.
6. Select the padding
The gasket at the joint of air duct flange shall be made of airtight, dust-free, elastic and aging resistant materials, such as closed cell sponge rubber plate, soft rubber plate, etc. the thickness of the gasket shall be 5-8mm, and the joint shall be processed into ladder shape, and direct butt joint is strictly prohibited.
The relevant knowledge of air duct installation will be introduced here. Whether the air duct installation is standard or not is very important. You should be careful in the construction process.