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Off: The fan is off when the module is in this mode of operation
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Max: The return fan turns at its maximum speed. The Return Fan Percent Cmd output is set to 100%.
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Min: The analog fan output (Return Fan Percent Cmd) is zero, and the fan control output (Return Fan OnOff) is on when the module is in this mode of operation.
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Hold: Hold the outputs at their current position.
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Fan Track Control: The return fan speed tracks the supply fan speed. When the module receives this command, it operates in the Fan Track mode.