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display cooler electrical system components disassembly, diagnosis and maintenance (3)
display cooler electrical system components disassembly, diagnosis and maintenance (3)
(3) ordinary display cooler thermostat diagnostic thermostat normal performance: mandatory switch point is located At the bottom, it can automatically bounce back when pulled by hand; the resistance between the ground terminal and other terminals is infinite; the resistance between the non-ground terminals is disconnected when closed, and it should be turned on at normal temperature when opened, and at low temperature (-18℃) Or flip the forced switch, the incoming and outgoing terminals should be switched on and off; the other three-terminal display cooler thermostat is a light wire, only the thermostat is turned on, it is connected to the incoming wire, and it is not affected by the thermostat . One of the following conditions indicates that the thermostat is damaged: one is that the thermostat is burnt; the other is an open circuit, that is, there is no O ohm between any two terminals at room temperature; the third is that the contacts are stuck, that is, the incoming wire and the The resistance between the outgoing wires is still 0 ohm; fourth is leakage, there is resistance between the ground terminal and other terminals; fifth, the temperature performance deteriorates, which will make the temperature sensed by the thermostat not match the internal temperature of the display cooler, and the display cooler behaves as The ratio of start-up and downtime is not appropriate and can only be verified by substitution method.
[Note] Poor temperature sensing of the temperature sensor head of the thermostat will also cause the display cooler to not stop or turn on for too long to make the refrigerated room temperature too low.
(4) The solution to the damage of ordinary thermostats At present, the price of ordinary thermostats is low. If the thermostat is broken, it should be replaced without repair. If the thermostat is stuck, it is not necessary to replace the thermostat. Instead, add a time controller to the display cooler to control the power supply time of the display cooler by artificially setting the on and off time to achieve cooling control.
Dual-temperature dual-control display cooler Thermostat disassembly, diagnosis and maintenance The dual-temperature dual-control thermostat includes freezing and refrigeration. Let’s take refrigerated showcase display cooler BCD-203 model as an example to introduce, because the temperature adjustment button is set on the display cooler top front decorative panel, the thermostat is set on the display cooler top back, and the regulator between the two passes A pair of primary and secondary connecting rods are passed. The two thermostat temperature sensing tubes penetrate from the outside of the display cooler into the inside of the display cooler, so the disassembly and assembly are more complicated.
The disassembly of the dual temperature dual control thermostat is a refrigerated showcase display cooler 203A thermostat removal step, which needs to be carried out in five steps:
①Unscrew all the fixing screws of the thermostat box, remove the thermostat box;
pry two Thermostat main connecting rod;
③Remove the temperature sensor fixing box of the refrigerator compartment and pull the temperature sensor head straight;
④Remove the temperature sensor fixing box of the freezer compartment and pull the temperature sensor straight;
⑤Twist Open all the fixing screws of the condenser, move the condenser to a position, pull out the temperature sensing tube, note the corresponding wiring color of each terminal of the thermostat, unplug the wire, remove the fixing screw, and take out the thermostat.
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