Westinghouse 632488R Furnace Pressure Switch 0.75 in Wc

Product Description

The WESTINGHOUSE 632488R is a single-port, single-pole single-throw (SPST) pressure switch rated at 0.75 inches water column (WC), designed for use in gas furnace applications. This normally open (NO) switch monitors draft pressure within the furnace combustion air system, closing the control circuit only when the inducer motor has established adequate negative pressure. Licensed HVAC technicians install this component as part of routine furnace service or OEM-style replacement work. It serves as a critical safety device, preventing ignition if proper draft conditions are not met.

This pressure switch is used in residential gas furnace systems where a single-port pressure tap monitors inducer or combustion air pressure. It fits into the low-voltage control circuit and is typically mounted near the inducer housing or on the furnace cabinet. The switch activates during the furnace startup sequence, verifying that the draft inducer is operating before allowing the ignition sequence to proceed. It is appropriate for systems requiring a 0.75 inches WC setpoint on the pressure-sensing circuit.

Key Features

• Rated at 0.75 inches water column (WC) setpoint for reliable draft pressure sensing
• Normally open (NO) SPST configuration closes circuit upon confirmed inducer draft
• Single-port design simplifies hose routing and connection at the pressure tap
• Functions as a safety interlock, blocking ignition if draft pressure is insufficient
• OEM-style replacement form factor for straightforward swap-out during service calls

Compatibility

Designed as an OEM-style replacement pressure switch for residential gas furnace systems requiring a single-port, normally open SPST switch with a 0.75 inches WC setpoint.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with applicable mechanical codes, including the IFGC. Disconnect power to the furnace and turn off the gas supply before removing the existing pressure switch. Inspect the rubber hose connection for cracks or blockages before attaching the new switch, as a compromised hose will cause nuisance trips. Verify the inducer motor and pressure ports are clear of condensate or debris before returning the system to service.

Technical Specifications

• Type: Pressure Switch
• Application: Furnace
• Setpoint: 0.75 inches WC
• Switch Action: Normally Open (NO)
• Configuration: SPST Single Port

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 632488R