cold room cooling system，common fault：temperature drop slowly、system block lead to run wrong or not run.
temperature drop slowly may caused by wrong operation,the key is the adjustment of the expansion valve. Expansion valve open small volumn,the low volumn of refrigerant pass,low pressure,so low temperature;open big volumn of the expansion valve,the more refrigerant pass,high pressure.So if the expansion outlet pressure is too low,and the evaporating pressure and temperature is low.Because of the low volumn refrigerant imput of evaportor,low pressure,so temperature drop slowly.
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