To achieve light off, the catalytic unit should be preheated to what temperature for about how long?

To achieve light-off in a catalytic unit, it is crucial to preheat the unit to the right temperature for an adequate duration to ensure that the catalytic reactions can commence effectively. The correct temperature of 500 degrees is recognized in industry standards as optimal for facilitating the necessary chemical reactions within the catalyst. Preheating for about 10 minutes allows sufficient time for the catalyst to reach a stable temperature where the catalytic processes can begin to operate efficiently without risking damage to the unit or compromising its performance.

This specific temperature and time ensure that the catalytic action is initiated properly, allowing for effective control of emissions and efficient operation of the system.