On a pressuretrol, the main burner starts on?

The main burner on a pressuretrol starts based on pressure differential, which is the difference between the set pressure and the actual pressure within a system. This device is designed to monitor the pressure in the system and initiate the operation of the burner when the pressure falls below a predetermined level.

By using pressure differential, the pressuretrol ensures that the system maintains sufficient pressure for proper operation. When the pressure drops to a level that is too low, the pressuretrol activates the burner to bring the pressure back up to the desired setpoint. This is essential for maintaining safe and efficient operation in various applications, particularly in heating and boiler systems.

In summary, the reliance on pressure differential in a pressuretrol allows for effective regulation of burner operation, contributing to the overall safety and efficiency of the system.