Does the freezer get warmer during self-defrost? This is the component in charge of turning off the defrost heater at the end of the defrost cycle, when the evaporator gets up to 38 to 47 degrees F. Freezer burn is a common problem caused by food packaging. Testing proved that the auto-defrost process of the Helmer Scientific -30ºC freezer is a more effective and efficient compared to a cold wall freezer’s manual defrost process. The defrost cycle can start anywhere between 9 and 99 hours and lasts about 20 minutes. This is the component that controls how long the heater stays on when the machine is in defrost mode. This is normal and doesn't affect the quality of the food in the freezer. (Unfortunately, that's not how it necessarily works out in practice. The process is followed by the humming noise when the compressor is operating, “whooshing” sound once the defrost cycle is over and white steam that blows out the top of the unit. Q5. Download : Download full-size image; Fig. Managing Auto-Defrost Cycles. This could be due to a malfunction of the defrost termination thermostat. Airflow also decreases as the passages narrow due to ice buildup. Moisture from the air freezes onto the evaporator coils (the cooling coils in the freezer) and forms an insulating barrier to heat transfer. The temperature increase in the freezer section during a defrost cycle varies. Defrost cycles are normally time-initiated and temperature-terminated, with a fail-safe time backup. What causes freezer burn? I'd like to know what temperature the freezer should reach during the defrost cycle. Testing proved that the auto-defrost process of the Helmer Scientific -30ºC freezer is a more effective and efficient compared to a cold wall freezer’s manual defrost process. I'm going to agree with Eric, except to say that my freezer doesn't get above 35 or so during the defrost cycle. If your refrigerator is not defrosting, then it may not be able to get cold enough. Although you cannot change the surrounding outside temperature, you can try to locate the freezer in a cooler part of the home, such as within an air … LIKELY CULPRIT: The defrost thermostat needs to be replaced if its contacts aren’t properly functioning. The temperature increase in the freezer section during a defrost cycle varies. When the heater is turned on, the defrost heater temperature reaches its steady state value of 560 °C within 5 min. If the temperature does not exceed 20 degrees for 60 minutes the food should be ok. Say the defrost cycle is thirty minutes, the heater may only be on for ten of those thirty minutes on the timer controls. The normal freezer temperature is between 0ºF and 5ºF. This PCM system has significantly decreased the rate of temperature increase inside the freezer during defrosting and power loss. And is it safe? It can rise as much as 25-30 degrees but only for a very short time. A6. The compressor is the element which moves the refrigerant and increases the pressure/temperature. Yes it is possible for the temp to be over 0 degrees for more than an hour. The controller can be programmed with defrost cycle duration and frequency. Here are some things to check for if the freezer is running too warm, but the refrigerator section is maintaining the desired temperature: The freezer’s set temperature is correct. The defrost cycle can vary from 15 to 40 minutes depending on the type of defrost control being used. 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