A couple of weeks ago, I gave you a very simplified explanation of how a refrigerator works, with a promise of more to come. Well, here it is.
If any of you out there remember spending hours melting, chipping and cleaning ice out of your freezer, you are probably thanking the deities for the development of the frost free systems in our refrigerator/freezers because with the help of technology, we don't have to do that anymore.
As learned in our last session, the coolant (which is very cold now) flows through the evaporator and absorbs the warm air in the freezer. Because the metal of the evaporator is very cold and the air in the freezer is damp, frost starts to develop on the evaporator coils. If left unchecked, this ice buildup can cause all kinds of damage. So a defrost system was developed to periodically turn on and melt this ice.
|Mechanical Defrost Timer|
|Adaptive Defrost Control|
Now the defrost heater starts heating up and melting that ice. If you stand by your refrigerator when this cycle is in process, you can hear the ice melting and dripping into the drain trough where it goes to an evaporator pan under the refrigerator to evaporate on its own.
Hopefully, this little tutorial has given you a better understanding on how your refrigerator works.
Have a great week!