The method of troubleshooting the metal workware freezer

Although the refrigeration system and control circuit of the metal workware freezer are complex, the common faults are mainly the circulatory system and part of the circuit fault, and here is a brief introduction to several common faults and their troubleshooting methods.
the ultra-low temperature refrigerator refrigeration system and control circuit are more complex, but the common fault is mainly the circulatory system and circuit part of the fault, the following brief introduction to several common faults and their troubleshooting methods.
1. After powering on, the air switch of the total power supply automatically disconnects the exclusion method: check whether the compressor of the refrigeration system is damaged, if the damage will cause a short circuit, causing power protection.
can replace accessories, if there is no original parts, can be calculated to replace a considerable power refrigerator compressor.
the fault is generally caused by unstable power supply, in this case, as long as the installation of delayed regulatory power supply, the failure will not occur again.
2. The inner temperature of the box has stopped working without reaching the set temperature Exclusion method: although the set temperature has not been reached in the box, the panel shows that the temperature has reached the set temperature.
is due to damage to the thermistor that detects the temperature and the fitting needs to be replaced.
if there are no original parts, you can reinstall a set of temperature control system, you can eliminate the fault.
3. Refrigerator cooling effect is reduced, the human touch box metal part has electric shock feeling exclusion method: using a meter to measure the leakage of refrigerator electricity, the use of segmentation to check.
when the high-temperature compressor is powered up separately, check whether the compressor leakage caused the entire box to be charged.
static detection compressor post, pay attention to observe the motor winding lead plug part, if there are traces of fire with the chassis, indicating that there is leakage.
. Refrigerator cooling is not sufficient to check the evaporator surface for frost, refrigerator door switch too frequently, refrigerator back contact with the wall, whether too many items.
5. Ultra-low temperature treatment refrigerator noise is too large to check whether the soleplate is strong, the refrigerator is stable, if unstable, adjust the active screws so that the four corners are firmly supported on the bottom plate, whether there are objects touching the back of the refrigerator.
if the refrigeration effect is poor, the refrigerator does not shut down, the cooling tube is not hot, the evaporator has a small airflow sound, these are due to slow leakage caused by serious loss of refrigerant.