Reliable Operation: The pilot-operated floating diaphragm design allows for consistent opening and closing even at high pressures

Tested Reliability: Every unit is factory-tested to ensure the 24V motor draws consistent current under load

this assembly is technically rated for the dynamic torque and weight of 2-speed blower configurations

Safety standards require the relief valve's BTU rating to be equal to or greater than the boiler's maximum output

and UBX series

Carrier HH12ZA218 Limit Switch 320735-701 Reliable Operation: The pilot-operated floatingThe Carrier HH12ZA218 Limit Switch is a critical safety component designed for high efficiency residential heating systems, specifically engineered for furnace limit switch replacement in Carrier, Bryant, and Payne units. This OEM replacement part functions as a normally closed switch that breaks the electrical circuit when the internal plenum temperature exceeds the 180 220F safety threshold. As an auto reset limit switch, it automatically re engages