Hello, That would be the fast freeze switch. 0 for off and 1 for on. If you would put a new load of food and you want it to freeze faster, you can switch it to I, then as the food freezes up, you can switch it back to 0 to turn off the fast freeze feature...
The compressor would run continuously until the switch is set to 0 so that the compressor would now switch on and off depending on the setting of the thermostat. It actually bypass the thermostat temporarily.
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