ICM Controls ICM450A Monitor 321042-401 The Lennox 57M66 Pressure Switch

The Lennox 57M66 Pressure Switch is a critical safety component designed for precise combustion air proving in high-efficiency gas furnaces

Precise 24V pressure control integration allows for seamless compatibility with standard HVAC control circuits

Unlike standard static plates

If you observe high static pressure in the building

With a standard 1/2" NPT connection and a fixed 4" WC manifold pressure

ICM Controls ICM450A Monitor 321042-401 The Lennox 57M66 Pressure SwitchThe ICM450A programmable 3 phase line voltage monitor provides essential protection against common electrical faults that lead to premature compressor and motor failure. Designed as a direct replacement for the ICM450, 6831, and F6872, this 3 phase voltage monitor tracks incoming power to prevent damage from phase loss, phase reversal, and voltage unbalance. For technicians working in the field, the backlit LCD simplifies setup, showing real time RMS