Fan coil unit is one of the terminal devices of air conditioning system, which is composed of small fan, motor heat exchanger (coil), condensate pan, shell and controller. When the cooling water or hot water flows through the fan coil pipe, it exchanges heat with the air outside the pipe, so that the air is cooled, dehumidified or heated to adjust the indoor air parameters. It is a common end device for cooling and heating. But also because of the construction, design errors and many problems, one of the more common is the leakage problem. In general, there are special-shaped pipe fittings such as valve, filter and hose connected to the coil in the fan coil system. The insulation is not easy to be compacted, and it is easy to cause condensate leakage due to frequent disassembly in daily maintenance. In engineering practice, the method of partial pipe slope of supply and return water to the coil side can be used to prevent and remedy. Causes and solutions of fan coil leakage: 1. If the water leakage is outside the water collecting pan of fan coil unit, it is mainly due to the problem of insulation material, which can be eliminated by strengthening the insulation. 2. If the water leaks in the water collecting pan, it is that the condensate pipe of the fan coil is blocked and the condensate water overflows. We just need to dredge the condensate pipe. We need to prepare a 4-5m long plastic pipe, insert one end into the condensate discharge pipe, and connect the other end to the toilet faucet (a small joint can be made and screwed on the faucet by screw thread), and the pipe can be dredged by using the water pressure Or purge with carbon dioxide cylinder. It should be noted that the phenomenon of blockage of condensate pipe in fan coil unit is frequent, which is mainly due to the presence of water in the fan coil unit, coupled with the appropriate temperature, which is easy to make algae grow and produce sticky and slippery residue, which will block the condensate pipe. It is suggested that algaecide should be placed in the water collecting pan of fan coil unit to reduce its harm. 3. If the condensate drain pipe of fan coil unit of central air conditioning is always blocked, there will be water leakage from above. Once blocked, there will be a lot of biological sludge, and it is relatively dirty. In addition to regular cleaning, it is recommended to carry out system flushing and descaling, check whether there is filter screen at the return air outlet of fan coil unit, and whether the pipeline installation slope meets the requirements. Of course, there is no cure for the symptoms. Fan coil condensate is often blocked because there is too much dust in the place where the equipment is located, and the drip tray is often polluted. In fact, the biological scale is basically environmental pollution. In addition to cleaning, the maintenance of the equipment is very important.
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