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walk-in cooler refrigeration failure and maintenance method (5)
refrigeration failure and maintenance method (5)
Poor refrigeration and corrosion-like failure phenomenon somewhere in the evaporator: Poor refrigeration, corrosion-like somewhere in the evaporator pipe. Fault analysis: 60% is the leakage of the corrosive refrigeration pipeline, followed by the leakage of other refrigeration pipelines, and the compressor performance is poor in some cases. Troubleshooting: unplug the power plug, open the compressor process nozzle to vent and observe the refrigeration discharge, secondly, the total pressure of the system is 0.8MPa. Apply soapy water to the corroded part of the evaporator to check for leakage. There may be three situations as follows appear.
①
walk-in cooler The amount of refrigerant discharged is small, and the evaporator is corroded with bubbles. This means that the corroded area is called for leaks, the nitrogen in the system is released, and the corroded area and the surrounding area are polished 0.5 cm with sawtooth, and an appropriate amount of AB double-tube glue is mixed evenly and wiped on the corroded area for 0.5 hours after curing. once.
②The amount of refrigerant discharged is small, and there are no bubbles in the corroded area of the evaporator. This shows that the system does have leaks, but the leaks are not where the evaporator is corroded. The soapy water should be applied to the welds of the exposed pipelines, where there are air bubbles, the leaks are located, and then the high-pressure pipeline and the low-pressure pipeline should be pressured to check for leakage. The leaking point is repaired on the exposed tube, the leaking point is thrown away in the anti-dew tube, and the leaking point is in the evaporator and cannot be disassembled, then the evaporator is embedded in the
walk-in cooler.
③ The amount of refrigerant discharged is large. Open the outlet of the compressor by welding, plug in the power supply to make the compressor run, and press the outlet of the exhaust pipe with your thumb. If you can hold it down, the compressor has poor exhaust performance. Replace the compressor of the same model. After the refrigeration system is repaired, blow through the system, replace the filter drier, evacuate again, add refrigerant, test the machine, and seal the system.
the cooling of the intercooler is poor and the fan does not run. Trouble phenomenon: poor cooling, the fan does not run, the thermostat adjustment knob is placed in the middle position, open the freezer door, use your hand Press the fan switch button, it still does not work. Failure analysis: The fan does not run and the evaporator cooling capacity is not good enough, which makes the
walk-in cooler appear as poor cooling. There may be a problem with the fan motor circuit, or the fan blade may be stuck in ice. Troubleshooting: Remove the air duct grid on the back of the freezer compartment, observe the fan blades, and measure the windDetermine the fault range by fan motor terminal resistance and voltage.
① The fan blades are jammed by ice, rotate the defrost timer to the defrost position (turn to click and make a sound). If the
walk-in cooler defrosts but the fan still does not run after the defrost is completed, it means that the fault lies in the fan motor circuit. Press and the fan blades rotate flexibly. Check: If it does not defrost, the fault is in the defrost circuit. Check in turn Temperature fuse, defrost heater (normal resistance value is about 350Q), regulating thermostat (water ingress, corrosion is damaged), defrost timer (coil resistance value is about 8kQ, the three contact terminals should rotate with it The adjustment of the button is switched on and off alternately).
②The fan blades rotate flexibly, indicating that the fault lies in the fan motor circuit. Measure the resistance between the two terminals of the fan motor. The normal value should be 330Q-390Q. If it is too large or small, it will be damaged. Secondly, measure the voltage between the two terminals of the fan motor. If there is AC 220V voltage, replace or repair the fan motor: if there is no AC 220V voltage, check the fan switch. [Note] The fan generally has insurance, and the insurance specifications are generally 250V/ 10A, and the melting temperature is 142℃.
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