DRS27 User’s Guide Chapter 5: Process Development Guide/Engineering Training
0027.00.902
5-15
Preheat Flow Rate:
Low temperature air flow from the nozzle may impede preheating the board due to ambient air moving
across the surface. The programmer has the option to:
1. Keep the air flow of the upper heater low, for example, 30% to reduce the air current cooling ef-
fect. This method will allow the system to have to stable, repeatable initial conditions prior to
the remaining heating events.
2. Turn off the upper heater, no air flow or temperature, during the preheat event. This event may
allow the board to preheat quicker.
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