Description
Lennox 80K27 Pressure Switch Overview
The Lennox 80K27 is an OEM-quality pressure switch engineered for dependable furnace and air handler protection. Designed to monitor draft pressure within the system, this switch ensures safe ignition sequencing by confirming proper inducer operation before allowing the burner to fire. It is a direct-fit replacement for compatible Lennox equipment, delivering the precision and reliability that HVAC professionals expect from a Lennox OEM component.
Key Features
- Setpoint: 0.34″ water column (“wc) — factory-calibrated for accurate pressure sensing
- Switch Type: SPST (Single-Pole, Single-Throw) — simple, reliable open/close operation
- Port Connection: 1/4″ barb fitting — compatible with standard pressure tubing used in residential and light commercial furnaces
- OEM Lennox replacement part — ensures proper fit and function in compatible equipment
- Protects against unsafe operation by verifying inducer draft before ignition
How It Works
The pressure switch senses the negative pressure (draft) created by the inducer motor. When the inducer establishes adequate airflow, the switch closes its SPST circuit, signaling the control board to proceed with the ignition sequence. If draft pressure falls outside the acceptable range — due to a blocked flue, failed inducer, or cracked pressure tubing — the switch remains open, locking out the burner and preventing unsafe operation.
Application
- Residential and light commercial gas furnaces
- Compatible with select Lennox furnace models requiring an 80K27 pressure switch
- Ideal for service replacement and preventive maintenance applications
Why Choose the Lennox 80K27?
Using a genuine OEM-specification pressure switch ensures your system operates within designed safety parameters. Aftermarket substitutes may not match the precise setpoint calibration, potentially causing nuisance lockouts or, worse, unsafe ignition conditions. The Lennox 80K27 is the correct, confidence-inspiring choice for technicians who demand accuracy and reliability on every service call.
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