This HVAC safety switch is the industry standard for maintaining UL compliance and system reliability in residential forced-air applications

ensuring proper fit and function without modification

The internal check valve mechanism ensures that the refrigerant always passes through the desiccant core in the proper direction

supporting up to 50% glycol mixtures

45" length and 3/4" diameter ensure a perfect fit with standard Trane fan wheel hubs and motor pulleys

Heil Quaker ICP 1173408 Monitor Board 30067439-890 This HVAC safety switch isThe Heil Quaker ICP 1173408 Monitor Board is a critical OEM replacement part designed for high stakes 3 phase HVACR equipment protection. This Relay Phase Monitor Board tracks incoming line voltage and sequence in real time, providing an essential secondary safety layer for scroll compressors and three phase motors. By monitoring for phase loss, reversal, and voltage unbalance, this board prevents the mechanical destruction that occurs when a