In order to prevent the occurrence of cracking phenomenon of fan coil, we usually do the heat treatment, even adding local heating antifreeze. But the cracking events still occur, causing serious losses to many people. According to the reasons, there are roughly the following points:
1, dirty plugging.
Dirty plugging is one of the most common problems. Generally, the dirty materials are iron filings, dust, sediment and weeds. Usually in order to maintain the stability of water quality, the system needs to add a proper amount of six sodium hexametaphosphate, but the hot water is easy to dissolve into a small amount of oxygen, the passage of time caused corrosion of metal pipes and equipment and rust.
2. Gas block.
Gas block is also a common problem, usually caused by gas plugging for the following reasons:清洗充水阶段部分空气未被排出；供热阶段水中溢出的空气及蒸发的水蒸气；由多次更换水质而导致系统中气体含量的增加；部分排气阀自动部件损坏，排气系统不理想。
Part of the air is not discharged during the filling stage; the water overflows and evaporates in the heating stage; the increase of the gas content in the system is caused by the repeated replacement of the water quality; the part of the exhaust valve is damaged automatically and the exhaust system is not ideal.
3. Influence of outdoor air temperature.
In different parts of buildings, corresponding to the different temperatures, with the lack of sunlight, so relatively low temperature, easy cracking.
4. management oversight.
The water flow in the pipeline can not be ignored; attention should be paid to the occasional fluctuation of the pressure gauge; the valves should be in the right open (closed) state.
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