Lennox 12L20 Pressure Switch 320788-702 protecting the building envelope and

protecting the building envelope and maintaining thermal efficiency

Installation involves centering the furnace cabinet onto the galvanized rails and securing the frame to ensure no air leakage occurs at the base-to-cabinet interface

We recommend inspecting your blower wheel for debris or imbalance when performing a Nordyne blower motor installation to prevent premature bearing failure

Optimized System Logic: Ensures accurate ambient data for efficient heat pump defrost cycles and outdoor air temperature monitoring

Lennox 12L20 Pressure Switch 320788-702 protecting the building envelope andThe Lennox 12L20 Pressure Switch is a critical OEM HVAC safety control designed to protect the compressor and refrigeration circuit from catastrophic failure. As a 590 PSI high pressure switch, it operates on a Normally Closed (N C) logic, meaning the internal contacts are closed during standard operation and snap open to kill the control circuit when discharge pressure exceeds the factory setpoint. This Lennox replacement part ensures the system