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Display cases Intercooler failure and analysis (2)

author:  supermarket refrigerated showcase category:  walk-in display coolers Views:  996Time:  2016-08-22
Display cases Intercooler failure and analysis (2)
display cases Intercooler failure and analysis (2)
display cases Intercooler secondary failure has poor cooling and fan does not turn. Trouble phenomenon: poor cooling, no shutdown, no fan operation. Fault analysis: There is a problem with the fan circuit, or the fan blades are stuck by frost due to non-defrosting (generally, the motor is burned out). Troubleshooting: Shut down for 24 hours and open the freezer door. After the frost layer of the freezer evaporator is naturally removed, open the back air duct grid of the freezer, observe the position of the defrost thermostat, and measure the fan motor voltage. The defrosting thermostat is not fixed in the designated position, install it on the accumulation tank as required, and then check whether the fan motor series fuse is burned out. Check the fuse of the fan motor in series (should be O), measure the resistance of the fan motor (should be between 330Q and 390Q), and check the fan switch (should be switched off as the button is pressed).
display cases Indirect cooling machine after replacing the capillary tube failure phenomenon: When blowing through the refrigeration pipeline, it is found that no gas is discharged from the capillary side, and it is judged that the capillary is blocked. This failure occurs after replacing the new capillary. Failure analysis: According to many years of maintenance experience, the possibility of capillary blockage caused by the quality of the capillary is almost zero. The capillary does not vent when filling the system with nitrogen. This is caused by the one-way valve, which is likely to be the capillary parameters (length, inner diameter) )wrong. Troubleshooting: Just replace the original capillary tube, then unplug the power plug, vent the refrigeration pipe, blow through the refrigeration pipe, evacuate the refrigeration pipe, add refrigerant, and seal.
[Note] Some intercoolers use rotary compressors, and their suction pipe is connected with a one-way valve, which is closed after shutdown to prevent the high temperature refrigerant of the compressor from flowing into the evaporator, causing the evaporator temperature to rise too quickly. When gas is blown into the nozzle, the one-way valve is closed, and no gas is blown out of the capillary tube.
display cases The indirect cooling machine changes the defrosting timing after the cooling difference failure phenomenon: after replacing the new defrosting timer, the cooling is bad. Fault analysis: The defrost timer model is incorrect. Troubleshooting: Replace the defrost timer of the same model, or modify the changed timer, that is, take out the Z-shaped piece of the original defrost timer and install it on the new defrost timer.
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