Here at the Kenmore Live Studio Jack Hipple further explains the ideas and principles behind TRIZ, a problem-solving, analysis and forecasting tool.
Here at the Kenmore Live Studio Jack Hipple explains the basic principles behind TRIZ, a problem-solving, analysis and forecasting tool. Jack then ...
Here at the Kenmore Live Studio Jack Hipple explains the basic principle behind TRIZ, a problem-solving, analysis and forecasting tool.
Kenmore Upright Freezer - DIY Home Improvement, Remodeling ...
The evaporator coil behind the cover on the back wall inside the freezer will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle. The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if its bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when its in the defrost mode....
How does a frost free refrigerator's defrost system work?
The heart of the defrost system is the defrost timer. The timer is a motorized device that opens and closes electrical contacts. Each contact can be thought as a light switch, one controls the defrost cycle, the other the cooling system. When one of these is switched on, the other is switched off. A motor on the timer (NOT illustrated) turns a cam that opens and closes these contacts at set intervals (see below for other types). Once the defrost termination thermostat (a.k.a. defrost limit switch) senses a set temperature, it opens the circuit to the defrost heaters, shutting them off. The timer remains in the defrost cycle until the timer advances back to the cooling mode. Since the limit switch is open, the heaters are no longer on for the rest of the cycle. Sometimes (but fairly rarely) both heater and cooling system can be energized by the timer at the same time. This can result in thawing then refreezing of food in the freezer compartment...