it restores continuity once temperatures return to a safe operating range

the Belimo KH-LF is the crankarm and retaining hardware only

Key Benefits Broad Compatibility: Engineered to work across a wide range of 120V HSI systems with 15 to 45-second prepurge/warm-up cycles

providing the necessary low-power signal control to switch the fan on or off reliably

Robertshaw 2374-498 Air Switch it restores continuity once temperaturesFor veteran technicians and contractors requiring a reliable pressure sensing solution, the Robertshaw 2374 498 Air Switch is a high performance, field adjustable air pressure switch designed for residential and light commercial HVAC applications. This SPDT air switch features an adjustable set point range of 1. 0" to 4. 0" WC, making it a versatile 1: 1 replacement for critical components in furnaces, electronic air cleaners, and humidifiers.