Westinghouse 632476R Furnace Pressure Switch Spst 2 Stage

Product Description

The WESTINGHOUSE 632476R is a two-stage, normally open (NO) SPST pressure switch designed for residential and light-commercial gas furnace applications. Pressure switches monitor draft inducer performance by sensing negative pressure in the flue or combustion air circuit. When the inducer fails to establish or maintain the correct pressure differential, the switch prevents ignition, protecting against unsafe operating conditions. This unit is rated at two set points: 0.7 inches water column (WC) and 0.3 inches WC, allowing it to serve both stages of a two-stage furnace's combustion sequence. HVAC technicians install and replace this component as part of routine furnace diagnostics and maintenance.

This pressure switch is intended for gas furnace installations where a two-stage inducer or two-stage gas valve is present. The dual set-point design means the switch responds to both first-stage and second-stage firing rates, making it appropriate for two-stage condensing or non-condensing furnace configurations. It is installed in the inducer or flue pressure sensing circuit and wired in series with the furnace control board's safety input. Service technicians typically encounter this part when diagnosing pressure switch fault codes or nuisance lockouts caused by a failed original switch.

Key Features

• Two-stage operation with set points at 0.7 inches WC and 0.3 inches WC
• Normally open (NO) SPST contact configuration for standard furnace safety circuit wiring
• Designed for furnace draft inducer pressure sensing applications
• Provides ignition lockout protection when proper draft pressure is not established
• Direct OEM-style replacement format for service and maintenance use

Compatibility

Designed as an OEM-style replacement pressure switch for two-stage residential and light-commercial gas furnaces requiring a 0.7/0.3 inches WC, SPST, normally open switch.

Installation Notes

This component is serviced by licensed HVAC technicians. Before replacing a pressure switch, shut off power to the furnace at the disconnect and turn the gas supply to the off position. Inspect the pressure port tubing and condensate drain for blockages before condemning the switch, as restricted tubing is a common cause of pressure switch faults. Follow all local codes and the furnace manufacturer's wiring diagram when reconnecting switch leads to the control board.

Technical Specifications

• Type: Pressure Switch
• Stage: 2-Stage
• Contact Configuration: SPST, Normally Open (NO)
• Set Points: 0.7 inches WC and 0.3 inches WC
• Application: Furnace

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 632476R