What does the "pilot operated" design mean for my system

this L180 limit switch acts as a primary heat sensor to prevent heat exchanger damage

This assembly features an integrated thermocouple and pilot tube with a 20-inch length

Constructed for industrial durability with a maximum inlet water temperature rating of 120°F

Why is the 30-inch capillary length important

Fasco B22508 Blower 319847-401 What does the "pilot operated"For industrial grade air movement and precise thermal management in specialized HVACR applications, the Fasco B22508 Blower represents a standard setting transflo blower assembly. This 115V shaded pole blower is engineered to deliver 105 CFM of free air output with a high efficiency single speed motor operating at 1500 RPM. Designed with a robust crossflow blower configuration and sleeve bearings, the Fasco B22508 ensures consistent laminar airflow