Allied Air 14A53 2-stage Pressure Switch 0.70/0.40 Wc

Product Description

The ALLIED AIR 14A53 is a 2-stage pressure switch designed for use in gas furnace systems that require staged combustion airflow proving. This switch monitors negative pressure in the inducer circuit and closes or opens its electrical contacts at two distinct set points: a high set point of 0.70 inches water column (WC) and a low set point of 0.40 inches WC. It serves as a safety and sequencing device, confirming that the inducer motor has established proper draft before allowing ignition to proceed. Licensed HVAC technicians install this component as part of furnace control circuit service or replacement work.

This pressure switch is intended for residential and light-commercial gas furnaces equipped with two-stage heating operation. Two-stage furnaces use distinct pressure thresholds to verify airflow at both low-fire and high-fire inducer speeds. The 14A53 is cross-referenced to Lennox part number 104549-11, making it a recognized replacement option for technicians servicing Lennox-platform equipment. Always verify pressure set points and port configuration against the existing switch before installation.

Key Features

• Two-stage operation with high set point of 0.70 inches WC and low set point of 0.40 inches WC
• Serves as inducer draft-proving safety device in the furnace low-voltage control circuit
• Cross-referenced to Lennox 104549-11 for service replacement applications
• Supports staged combustion sequencing in two-stage gas furnace systems

Compatibility

Cross-referenced as a replacement for Lennox 104549-11. Designed for use in two-stage gas furnaces requiring a dual-set-point inducer pressure switch. Verify set points, port count, and hose barb orientation against the existing switch before installation.

Installation Notes

Pressure switch replacement is performed by licensed HVAC technicians. Shut off power to the furnace at the disconnect and set the thermostat to the off position before removing any wiring or hose connections. Confirm that the replacement switch set points match the values required by the furnace manufacturer. Refer to the appliance wiring diagram and applicable local mechanical codes before returning the system to service.

Technical Specifications

• Switch Type: 2-Stage Pressure Switch
• Set Point High: 0.70 inches WC
• Set Point Low: 0.40 inches WC
• Cross-Reference Part Number: Lennox 104549-11

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: 14A53