Allied Air 91W53 2-stage Pressure Switch Replaces 102737-11

Product Description

The ALLIED AIR 91W53 is a 2-stage pressure switch designed for use in gas furnace applications where two-stage draft inducer or burner operation requires staged pressure sensing. The switch monitors negative pressure in the flue or inducer circuit and signals the control board when safe combustion airflow conditions are met. It features a high-stage set point of 0.60 inches W.C. and a low-stage set point of 0.30 inches W.C. Licensed HVAC technicians install this component as part of routine furnace repair or control system replacement work.

This pressure switch is suited for residential and light commercial gas furnace installations that use two-stage heating operation. Two-stage furnaces cycle between a lower firing rate and a higher firing rate, and this switch provides the corresponding pressure verification at each stage. It is referenced as a direct replacement for Lennox part number 102737-11 and applies to systems where the OEM specification calls for a dual set-point pressure switch with these exact values.

Key Features

• High-stage set point: 0.60 inches W.C. for second-stage pressure verification
• Low-stage set point: 0.30 inches W.C. for first-stage pressure verification
• Two-stage sensing supports staged burner and inducer control sequences
• OEM-referenced replacement for Lennox 102737-11
• Designed for negative-pressure sensing in inducer or flue circuit applications

Compatibility

Referenced as a direct replacement for Lennox part number 102737-11 in two-stage gas furnace systems requiring a dual set-point pressure switch at 0.60 and 0.30 inches W.C.

Installation Notes

Installation should be performed by a licensed HVAC technician. Shut off power to the furnace at the disconnect and allow the inducer motor to come to a complete stop before removing the existing switch or its pressure tubing. Inspect the rubber hose connections for cracks or blockages before installing the new switch, as degraded tubing is a common cause of nuisance pressure switch faults. Work should comply with applicable local mechanical codes and the furnace manufacturer's service instructions.

Technical Specifications

• Switch Type: 2-Stage Pressure Switch
• Set Point High: 0.60 inches W.C.
• Set Point Low: 0.30 inches W.C.

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: 91W53