Nordyne 632487R -0.90″WC SPST Pressure Switch

Description

Nordyne 632487R Pressure Switch Overview

The Nordyne 632487R is an OEM replacement SPST (Single-Pole, Single-Throw) pressure switch engineered to monitor and verify proper draft pressure in Nordyne-brand heating systems. Set at a trip point of -0.90″ water column (WC), this switch confirms that the inducer motor is creating adequate negative pressure before allowing the ignition sequence to proceed — a critical safety function that helps prevent unsafe furnace operation.

Key Features

• OEM Nordyne replacement pressure switch for direct, reliable fit
• SPST (Single-Pole, Single-Throw) switching configuration
• Rated set point: -0.90″ WC (water column)
• Monitors inducer/draft blower operation to ensure safe combustion venting
• Helps prevent ignition if proper negative pressure is not established
• Designed for long-term durability in residential and light-commercial furnace applications

How It Works

The pressure switch is connected to the furnace’s inducer assembly via a rubber hose. When the inducer motor starts, it creates a negative pressure. Once that pressure reaches the -0.90″ WC set point, the switch closes its contacts and signals the control board to continue the ignition sequence. If the required pressure is not achieved — due to a blocked flue, failed inducer, or disconnected hose — the switch remains open, locking out the system and protecting against hazardous conditions.

Applications

• Nordyne-brand gas furnaces requiring a -0.90″ WC SPST pressure switch replacement
• Residential and light-commercial forced-air heating systems

Why Choose OEM?

Using a genuine Nordyne OEM pressure switch ensures compatibility with your system’s control board and safety circuitry, maintaining factory performance standards and protecting your equipment warranty.