Pneumatic valve frost cause analysis

air conditioner expansion pneumatic valve frost cause analysis, export expansion pneumatic valve ( Or pneumatic valve body frosted main reason is caused by expansion pneumatic valve flow is too small, a few may lead to the result:

the serious lack of fluorine in frost (expansion pneumatic valve Or icy, if add refrigerant, the temporary can be ruled out, If your filling quantity is too small, of course, also have this problem.

non azeotropic working medium components lead to alienation of strange questions, don't know filling refrigerant is put the dry weight of liquid injection or increase? If it is dry weight of liquid injection that also can be ruled out.

system congestion lead to low expansion pneumatic valve flow that expansion pneumatic valve frost, this can be judged by examining the line of temperature, frost (such as Or ice compressor after the start, first to see how temperature difference at the ends of the filter drier, if there is no difference in temperature to expand the scope, inspection such as the temperature difference between the condenser and export expansion pneumatic valve import and other paragraphs the temperature difference between the pipe line elsewhere have freezing frost phenomenon, etc. , most can judge.

expansion pneumatic valve configuration is too small lead to frost, but in general the original machine with the expansion of the pneumatic valve not to this extent, but if the equipment operation condition has gone beyond the requirements of the original machine that said the other.

operation condition, it won't be able to solve the problem right away, also don't know how other parts of the pipeline operating temperature, such as compressor to temperature degrees, super-cooling degree, degree of superheat, if these parameters are not normal that will lead to all sorts of problems.