First, the unmanned vending machine refrigerant is not enough for the present barrier image and the reason

(1)Fault phenomenon: unmanned vending machine machine cooling effect is poor, the air outlet is a little cool, and the manifold pressure table check found that the high pressure side, low pressure side pressure are low (in the compressor speed is 2000r/min, the ambient temperature is about 35 ℃, low pressure table index is less than 1kg/cm2, high pressure table index is less than 10kg/cm2), while the flow of bubbles visible from the sight glass.

(2) cause of failure: unmanned vending machine refrigeration system has refrigerant leakage points, and lead to refrigerant shortage.

(3) Treatment methods.

1)Use electronic leak detector to find out the leak point and repair or replace the parts.

2) If the parts are not replaced, only the right amount of refrigerant can be added; if the parts are replaced, the right amount of refrigerant oil should be added as required, and the system should be vacuumed to add sufficient refrigerant.

Second, the unmanned vending machine refrigerant refilling too much fault phenomenon and processing methods

(1) fault phenomenon: unmanned vending machine machine cooling effect is poor, with manifold pressure table check found that the high pressure side, low pressure side pressure are too high (in the compressor speed is about 2000r/min, the ambient temperature is 35 ℃, the high pressure table pressure is about 19kg/cm2, low pressure table pressure is 2.3kg/cm2, and the visual liquid mirror can not see the bubble flow.

(2) cause of failure: Refrigeration system is overfilled with refrigerant, so that the refrigeration capacity can not be fully developed, resulting in poor refrigeration effect.

(3) processing method: in the unmanned vending machine refrigeration system access manifold pressure table, slowly loosen the manifold pressure table low pressure side manual valve, so that the refrigerant slowly discharge (not from the high pressure side row, because from the high pressure side put refrigerant will bring out a lot of refrigeration oil), until the high and low side pressure is normal, at the same time from the sight glass can see the refrigerant clear flow, and occasionally bubble flow.