Liquid Handling: Large internal volume protects the mechanical assembly from occasional liquid floodback

Designed to meet strict HVAC ignition system standards

The 27W12 is typically calibrated for R-22 systems with lower trip points

This White-Rodgers igniter kit is the direct engineering update for the legacy 768A-426 model

Lennox 64W86 Pressure Switch 322056-301 Liquid Handling: Large internal volumeThe Lennox 64W86 Pressure Switch is a critical safety component engineered specifically for two stage gas furnaces. This factory authorized replacement operates as an air pressure sensor, monitoring differential pressure to ensure proper inducer motor performance and venting before allowing the ignition sequence. Designed for high efficiency systems, it features a dual level calibration with a set point high of 1. 20" W. C. and a set point low of 0.