Service Manual

30
C. Defrost
To initiate a manual defrost, press the manual defrost button briey. The defrost icon and
"dEF" appear on the display.
1. Refrigerators
Refrigerators use an off cycle defrost initiated by a 2-hr. cumulative compressor run
or a 2-hr. continuous compressor run defrost timers. As soon as the compressor
energizes, the defrost timers start. When either of the 2defrost timers terminate,
defrost begins. Cabinettemperature is not displayed during defrost; "dEF" is displayed
in its place. The evaporator fan motor runs during defrost. When the defrost thermistor
warms to 44°F (6.6°C), defrost terminates. "dEF" is displayed during defrost. Once the
compressor energizes the 15-min. display timer starts. Once the 15-min. display timer
terminates, cabinet temperature is displayed. Refrigerators have a minimum defrost
interval of 2-hrs. The minimum defrost time is 5-min. and the maximum defrost time is
1-hr.
2. Freezers
Freezers use a heated defrost initiated by a 5-hr. cumulative compressor run or a
4-hr.continuous compressor run defrost timer. As soon as the compressor energizes,
the defrost timers start. When either of the 2 defrost timers terminate, defrost begins.
Cabinettemperature is not displayed during defrost; "dEF" is displayed in its place.
When the defrost thermistor warms to 77°F (25°C), defrost terminates. A 3-min.
compressor delay timer starts. Once the 3-min. compressor delay timer terminates
a 4-min. evaporator fan motor delay timer starts. Once the 4-min. evaporator fan
motor terminates, 15-min. temperature display delay timer starts. Once the 15-min.
temperature display delay timer terminates, cabinet temperature replaces "dEF" on
the display. Note that the 4-min. evaporator fan motor delay time is a maximum; if the
defrost thermistor cools to 15°F (-9°C) before the 4-min. evaporator fan motor delay
timer terminates, the evaporator fan motor will energize and the 15-min. temperature
display delay timer starts. Freezers have a minimum defrost interval of 5-hrs. The
minimum defrost time is 5-min. and the maximum defrost time is 1-hr.
3. Manual Defrost
To initiate a manual defrost, press the manual defrost button.