General > General Technical Chat
Freezer fridge defrosts when operated in a cold room
james_s:
Well my plan was to just switch on the light based on room temperature, right now I've just manually plugged it in and left it on all the time over the coldest part of winter which is less than ideal, but beats melted ice cream.
Peabody:
As I described in reply #7, I was thinking of sensing room temperature too, but switching the heating element on and off, with the duty cycle determined by the room temperature, so as to provide only the heat that's needed.
I think there may also be an issue with extreme cold, where you don't want the compressor to turn on at all, but need heat in the lower compartment to keep the beer from freezing. So you might need to run the main refrigerator power plug through a second relay to turn it completely off if it gets cold enough. I don't think an attached garage would get that cold, but we should consider what to do when we get an arctic blast like last year.
thm_w:
--- Quote from: MLXXXp on October 16, 2021, 10:11:18 pm ---The way it keeps both sections at the required temperatures is:
- If the freezer is okay but the fridge is too warm: Open the air valve and turn on the just the fan (not the compressor) to cool the fridge from the cold in the freezer.
- If the freezer is too warm and the fridge is also too warm: Open the air valve and run the compressor and turn on the fan to cool both sections (like a common fridge/freezer).
- If the fridge is okay but the freezer is too warm. (The OP's situation): Close the air valve and run the compressor and fan to only cool the freezer.
--- End quote ---
But this is how most modern fridges operate, right. How else would you achieve dual temperature control?
They still say to not use them at low temperatures, eg LG: "Install this appliance in an area where the temperature is between 55 °F (13 °C) and 110 °F (43 °C)."
MLXXXp:
--- Quote from: thm_w on October 19, 2021, 08:56:24 pm ---But this is how most modern fridges operate, right. How else would you achieve dual temperature control?
--- End quote ---
My fridge is a freezer on top type. Maybe modern bottom freezer fridges have fancy electronic control. However, it looks to me that standard, average priced, top freezer models have either mechanical or electronic control for the fridge but if they have a separate control for the freezer, it's just a knob that mechanically varies size of the channel for air flow from the freezer section to the fridge section.
thm_w:
--- Quote from: MLXXXp on October 20, 2021, 11:08:41 pm ---My fridge is a freezer on top type. Maybe modern bottom freezer fridges have fancy electronic control. However, it looks to me that standard, average priced, top freezer models have either mechanical or electronic control for the fridge but if they have a separate control for the freezer, it's just a knob that mechanically varies size of the channel for air flow from the freezer section to the fridge section.
--- End quote ---
Yes I see what you mean now, I've only ever used bottom freezer type and it looks like they are at least a few hundred dollars more expensive. Part of what would pay for the electronic controls.
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