Armstrong Furnace R40154B004 Limit Switch suitable for most forced air

suitable for most forced air furnace and rooftop unit HSI systems

including high-pressure R-410A refrigerant applications with a maximum rated pressure of 650 psi

the neon bulb has likely reached its end of life

This high-reliability component is essential for maintaining the power factor and extending the operational lifecycle of motor windings in residential and light commercial cooling systems

Armstrong Furnace R40154B004 Limit Switch suitable for most forced airThe Armstrong Furnace R40154B004 Limit Switch is a critical safety component designed for precise thermal regulation within residential heating systems. Engineering for reliability, this L170F 30 limit control features a factory set 140 170F temperature range, ensuring the burner circuit interrupts if internal temperatures exceed safe operational parameters. As an authentic OEM Armstrong replacement part, it provides high limit protection for Allied