this bronze-bodied safety valve is factory-set at 50 PSI to prevent over-pressurization in high-output hydronic heating systems

Precision Sensing: Optimized for accurate flame signal detection to maintain steady HVAC ignition cycles

ensuring consistent electrochemical response even in high-purity or high-solids applications

Why does the N/C side have a lower amperage rating

relieve all internal pressure

Carrier HH12AT008 Fan/Limit Switch 321142-301 this bronze-bodied safety valve isThe Carrier HH12AT008 Fan Limit Switch is a critical safety and operational component designed for intermittent ignition and legacy standing pilot gas furnaces. Engineered to regulate blower motor engagement and provide high limit protection, this bimetal sensing element control ensures the heat exchanger does not exceed safe operating temperatures. As a combination fan limit control, it features adjustable cut in and cut out settings, allowing