Preheat is only in wattage mode. However, it's not needed in tc. You simply set your wattage higher and that'll work as preheat. The mod fires at the higher wattage until it reaches the set temperature, at which point it throttles down. Preheat settings are kind of superfluous in tc mode.
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How do you set preheat in wattage mode on a dna mod? I played around with the settings on escribe but I am not sure I am doing it correctly.