Allied Air 26W76 Pressure Switch 0.40 Inches Wc

Product Description

The ALLIED AIR 26W76 is a furnace pressure switch designed to monitor negative pressure generated by the draft inducer assembly in a gas furnace. It actuates at 0.40 inches W.C. and resets at 0.55 inches W.C., providing a defined operating window that confirms proper venting before the control board allows ignition to proceed. This switch is a safety-critical component in the furnace control sequence and is typically replaced by licensed HVAC technicians during service calls involving inducer faults, pressure switch failures, or no-heat diagnostics.

This pressure switch is suited for residential gas furnace applications where draft-proving control is required as part of the ignition interlock sequence. It is referenced under Lennox part number 65289200 and serves as a replacement component in systems using that original specification. Installers should verify the actuation set point matches the original equipment requirement before installation.

Key Features

• Actuates at 0.40 inches W.C. to confirm adequate inducer draft before ignition
• Resets at 0.55 inches W.C. providing a clear hysteresis window
• Cross-referenced to Lennox 65289200 for replacement sourcing
• Safety-interlock function prevents ignition without verified venting
• Direct OEM-style replacement reduces diagnostic and installation time

Compatibility

Cross-referenced to Lennox part number 65289200. Designed as an OEM-style replacement pressure switch for residential gas furnaces requiring a 0.40 inches W.C. actuation set point. Confirm set point and port configuration against the original equipment specification before installation.

Installation Notes

Pressure switches are installed by licensed HVAC technicians as part of furnace draft control service. Shut off power to the furnace at the disconnect and turn off the gas supply before replacing this component. Inspect the rubber hose connecting the switch to the inducer housing for cracks or blockages, as a failed hose is a common cause of pressure switch fault codes. Follow local mechanical codes and the manufacturer service manual for proper port orientation and hose routing.

Technical Specifications

• Actuation Set Point: 0.40 inches W.C.
• Reset Set Point: 0.55 inches W.C.

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: 26W76