Lennox 75W61 Gas Furnace Pressure Switch 0.75 in Wc

Product Description

The LENNOX 75W61 is a gas furnace pressure switch rated at 0.75 inches water column (WC). Pressure switches are safety devices that monitor the negative pressure created by the inducer motor during furnace operation. When the inducer establishes the correct draft, the switch closes and allows the ignition sequence to proceed. If draft pressure falls outside the set point, the switch opens and locks out the furnace, preventing unsafe operation. Licensed HVAC technicians install and replace this component as part of routine furnace diagnostics and maintenance.

This pressure switch is designed for use in gas furnace applications where a 0.75 inches WC set point is required. It is typically found in induced-draft and condensing gas furnace systems. When a furnace fails to ignite or displays a pressure switch fault code, this component is a common diagnostic target. Replacement is standard practice when the switch tests open under correct draft conditions or when the diaphragm has failed.

Key Features

• Set point rated at 0.75 inches water column (WC)
• Functions as a safety interlock monitoring inducer motor draft pressure
• Prevents ignition sequence from proceeding under unsafe draft conditions
• Direct OEM-style replacement for gas furnace applications

Compatibility

Designed as an OEM-style replacement pressure switch for induced-draft gas furnace systems requiring a 0.75 inches WC set point.

Installation Notes

Installation and replacement should be performed by a licensed HVAC technician. Before servicing, shut off power to the furnace at the disconnect switch and turn off the gas supply at the shutoff valve. Inspect the pressure tubing and port for blockages or cracks before installing the new switch, as a failed tube can cause repeat pressure switch faults. Follow all applicable local mechanical codes and manufacturer service instructions during replacement.

Technical Specifications

• Type: Pressure Switch
• Set Point: 0.75 inches WC
• Used On: Gas Furnace
• Weight: 0.3 pounds

Standard Information

• Brand: LENNOX
• Manufacturer Part Number: 75W61