Preheater This forced convection heater has a 6” x 6” heating surface, providing a 2ºC/cm temperature gradient. The temperature is preset at 180ºC, and is not adjustable, to protect the board and components from possible overheating. Airflow control This controls the amount of power applied to the work. Four settings give a range from 150-950W, to yield a board temperature range of 90-120ºC. Start/Stop button The preheater connects to the QX2 via a control cable to enable automatic operation during removal and reattachment. For use without the QX2, or if underboard heating is not needed, the manual Start/Stop button can switch the preheater on or off.