The fans operate sequentially according to the following: schedule:
With the temperature increasing, the first fan is energized at 101°C / 213.8°F, the second fan in energized at 102°C / 215.6°F.
With the temperature falling, the second fan is de-energised at 101°C / 213.8°F and the first fan is de-energised at 100°C / 212°F
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