In the above situation, the possible reasons are as follows:
1) The dryer's pressure switch is faulty, causing the cooling fan to operate continuously, leading to excessive heat dissipation;
2) Or the ambient temperature is too low in the northern winter;
3) It could also be due to an unreasonable design of the refrigerated dryer, such as an excessively long or narrow expansion capillary tube.
Solutions:
1) If the pressure switch is faulty, it needs to be replaced;
2) When the ambient temperature is below five degrees Celsius, the refrigerated dryer should not be turned on;
3) If the design is unreasonable, the refrigerated dryer should be replaced.
Note: For refrigerated dryers using R22 refrigerant, the low pressure should not be lower than 4 kg, and for R134a, it should not be lower than 2 kg, to prevent icing.