Allied Air 14T67 Combustion Air Pressure Switch 2-stage

Product Description

The ALLIED AIR 14T67 is a two-stage combustion air pressure switch kit designed for use in gas furnace systems. It monitors negative air pressure in the flue or heat exchanger proving circuit to confirm proper inducer motor operation before allowing ignition. The high-stage set point is 0.90 inches water column (WC) and the low-stage set point is 0.25 inches WC. This switch is a direct OEM-style replacement part installed by licensed HVAC technicians during routine maintenance, system diagnostics, or failed-switch replacement service calls.

This switch applies to two-stage gas furnace installations where the inducer assembly must prove adequate combustion airflow at two distinct firing rates. Two-stage pressure switches are common in residential and light-commercial furnaces running at both partial and full heat output. The 14T67 is also cross-referenced as Lennox 104937-02, making it a recognized replacement in service environments that stock or order by OEM part number.

Key Features

• Two-stage design with separate high and low set points: 0.90 WC and 0.25 WC
• OEM-style replacement for proven inducer proving circuit applications
• Cross-referenced to Lennox 104937-02 for straightforward parts identification
• Monitors negative pressure to confirm safe combustion airflow before ignition
• Suitable for residential and light-commercial two-stage gas furnace systems

Compatibility

Cross-referenced as a replacement for Lennox 104937-02. Designed as an OEM-style replacement for two-stage residential and light-commercial gas furnace systems requiring dual set-point combustion air pressure switches.

Installation Notes

Installation should be performed by a licensed HVAC technician. Shut off all electrical power and gas supply to the furnace before removing or installing the pressure switch. Inspect the pressure switch hose and port for cracks, blockages, or moisture before completing the swap, as a compromised hose will cause repeat failure. Follow applicable local codes and the IFGC for gas appliance service procedures.

Technical Specifications

• Set Point High: 0.90 inches water column (WC)
• Set Point Low: 0.25 inches water column (WC)
• Switch Stages: 2-stage

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: 14T67