Loading cycle of a boiler with time-out and one level probe:
The loading function regulates and controls the correct level of water in the boiler.
If the level probe in not covered by water, then the pump and solenoid valve outputs are simultaneously activated. When the probe is reached by water, the pump and solenoid valve outputs are deactivated and remain switched off until the status of the probe changes again.
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 output are deactivated in order to protect the machine from eventual breaks or malfunctioning.
The solenoid valve and the pump have two separated commons, inn this way they have different voltage.