The phrase "to control the burn" means to manage or regulate the intensity or discomfort of something, typically a physical sensation such as pain or heat. Full definition
But he said the best way to prevent future fires is to use controlled burns to clear out smaller sections of the forest, something the county and state are looking into. (suffolktimes.timesreview.com)
Normal combustion is a more controlled burning of the fuel, albeit very rapidly. (mechanics.stackexchange.com)
The tests involved controlled burns of oil in a specially designed test tank on the island. (sciencedaily.com)