Maytag side by side refrigerator
This is a problem that shows up here frequently as cold weather settles in.
You have two compartments side by side that are connected by an opening at both the top and bottom.
The left compartment is normally kept at zero degrees, while the right compartment is ideally 37 degree.
All refrigeration takes place in the freezer compartment. No cooling system exists in the fresh food side.
When the machine is on and running, a fan motor circulates air throughout the freezer, and by the design of the duct work in the freezer, forces some of that zero degree air into the fresh food compartment.
That air although only a small amount, settles down through the fresh food compartment and is returned to the freezer.
When in proper balance, it allows one system to produce 2 different temperatures.
During periods of time when the temperatures in the kitchen are cooler than summer, when the machine has lighter usage, it begins running less.
That is the main problem.
When not running, and the fan not circulating, the colder air, being heavier than the warmer air in the fresh food compartment, starts pushing freezer air into the bottom return duct. If the off time is great enough,any given day, the air from the freezer will push into the bottom crisper area, and in some cases cause below freezing temperatures.
Setting the freezer, fresh food, or both to a warmer setting, can many times help offset the problem to a degree, but not always eliminate it completely.
Upscale machines such as Sub Zero, use 2 compressors, 2 fan motors and are completely isolated from each other, thus solving the problem.
Using one compressor and one fan will always be a balance problem issue, and is not limited to any particular brand.
Raising the temperature in the room, and increased usage of the fresh food side will always help.
on Dec 30, 2009