Loading cycle of a boiler with time-out and double level probe (minimum/maximum):

The loading function regulates and controls the correct level of water in the boiler.

The pump and solenoid valve output are activated whenever the minimum level probe is not covered by water and they remain activated until the maximum level probe is reached by water.

The loading function remains activated for a maximum of 150 seconds (so called time-out). After this period of time the pump and solenoid valve outputs are deactivated in order to protect the machine from eventual breaks or malfunctioning.