This motor is a direct replacement for several ProTech and Emerson models

OEM Compatibility: Direct replacement for Lennox part 57M66 and 57M6601

125-inch spark gap is essential for consistent flame establishment

preventing soot accumulation and protecting the heat exchanger’s integrity

the internal contacts remain open until the reset button is manually depressed by a technician

Reznor 270389 Pressure Switch 318973-401 This motor is a directThe Reznor 270389 Pressure Switch is a critical safety component calibrated to a . 33" WC set point, specifically engineered for Reznor unit heaters. This differential air pressure switch monitors the pressure drop across the heat exchanger, ensuring the induced draft blower is operating at the correct static pressure before allowing the ignition sequence to proceed. As a genuine OEM Reznor replacement part, it maintains the precise factory