supermarket refrigerated showcase » article > display refrigerator > display cooler disassembly, diagnosis and maintenance of defrosting devices (2)
display cooler disassembly, diagnosis and maintenance of defrosting devices (2)
display cooler disassembly, diagnosis and maintenance of defrosting devices (2)
defrost timer diagnosis The contacts of the defrost timer are frequently on and off, which will appear after long use Poor contact of the contacts may cause no defrosting or compressor failure.
(1) Resistance method to diagnose the defrost timer, first measure the resistance of the two terminals of the defrost timer motor winding (AB or AC), the normal value should be 8lcQ, if infinite, it means that the coil is open. Secondly, measure the resistance between the three terminals of the three contacts (B, C, D), and rotate the defrost timer button. Normally, the CD and CB terminals should be alternately connected (OQ) and disconnected (co), such as between two terminals The high resistance value indicates that the internal contacts are not in good contact. The coil of the defrost timer burns out, and there is a burr between the stator and the rotor, which causes the rotor to be stuck, which will cause the defrost timer to stop running, and the contact in the defrost timer will remain in a state. If it is in the position of connecting the compressor, it will cause the display cooler to refrigerate without defrosting: if it is in the defrosting position, the compressor will not operate.
(2) Test machine method to diagnose the defrost timer. Use a switchboard with an ammeter or a clamp meter to monitor the operating current of the display cooler. Follow the steps below. Observe the defrost timer rotor first, if it does not rotate, it may be that the defrost timer coil is broken or the rotor is stuck. If the defrost timer rotor is running normally, continue to test the machine for 30 minutes to 60 minutes, turn the defrost timer button clockwise to the forced defrost position (the position where you hear click ), and observe the current value. If the current is OA, it is necessary to judge that the defrosting circuit is not working and the defrosting timer may be damaged. Use the resistance mentioned above to continue to confirm: if the current is about 0.5A, it belongs to the normal working value of the defrosting circuit. Continue to observe the defrosting completion After about 30 minutes, if the compressor is still running, it is judged that the defrost timer is normal. If the compressor is not running, see whether the contact of the defrost timer can jump to the compressor working position. If not, it means it is damaged.
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