Once food items freeze, they help keep the air inside the freezer cold. Too little (or too much) food can lead to frost in the freezer. If you notice wetness on the outside of ice cream cartons and other frozen foods, dry the packages before stowing them in the freezer to keep the moisture level low.
This issue can worsen in summer if the frozen items you purchase at the grocery store begin to thaw a bit before you get home. Putting wet food in the freezer also contributes to the problem. If you prepare meals in advance and then freeze them, let the food cool on the counter until it’s no longer hot, and then refrigerate it to chill further before storage in the freezer. RELATED: 9 Signs You Need to Replace Your Fridge Putting hot foods in the freezer will often trigger frost development.Īccording to GE Appliances, putting warm or hot food in the freezer introduces humidity to the unit, which can result in frost developing on the interior walls. Moisture could be entering in a number of ways, and we’ll go through them step by step to help determine the frosty felon and curtail it for good. As you’ve probably discovered, frost in the freezer can affect the flavor of your frozen foods (a condition called freezer burn) and it can restrict airflow, reducing the freezer’s efficiency.
When moisture makes contact with the freezer’s evaporator coils, located behind the back panel of the fridge or freezer, it triggers the growth of frost inside the freezer. Below is a simplified diagram detailing the principle.A: You may be able to troubleshoot the issue and be frost-free. Increased spring tension can be felt as increased resistance when turning the coarse adjustment screw. Thus, to adjust the thermostat to trigger at a higher temperature the opposing spring force must be increased. The important part is that to overcome manufacturing and material process variables and to allow use of the same design for different applications the spring tension is designed to be widely adjustable by manipulation of the coarse set screw.įrom the ideal gas law we know that at higher temperatures equal higher pressure against the diaphragm. The pressure sensor works by movement of a diaphragm set against a spring. The idea is that by sealing a quantity of gas in an enclosed vessel the variables V, N, and k are held constant resulting in the pressure of the gas being directly proportional to its temperature.įreezer thermostats use a long hollow tube as the enclosed vessel that is stuffed inside the freezer wall, with a short portion extending into the compressor compartment where one end is connected to a pressure sensor. Some units have them on the side, but I have yet to find one without a coarse adjustment screw.Įlectromechanical thermostats operate on the principle of the ideal gas law, PV=NkT, where P=Pressure, V=Volume, N=Number of gas particles, k=Boltzmanns constant, and T=Temperature in Kelvin. They are usually recessed within the unit and may be covered with tape. The coarse adjust screw on the unit pictured above is in the 5 o'clock position relative to the fine adjust dial shaft.
What is not widely known is how these electromechanical thermostats work, and that these internal freezer thermostats have a coarse temperature adjustment screw which can be used to widely adjust the temperature setting of the thermostat, even above freezing to keezer temps.
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