Nordyne 632495R -0.80″WC SPST Pressure Switch

Description

Nordyne 632495R — -0.80″WC SPST Pressure Switch

The Nordyne 632495R is an OEM replacement SPST (Single-Pole, Single-Throw) pressure switch engineered for use in Nordyne-brand furnaces and air handlers. Calibrated to a setpoint of -0.80″ water column (WC), this switch monitors the negative pressure generated by the draft inducer blower to verify that proper combustion airflow is established before allowing the burner sequence to proceed — a critical safety function in modern induced-draft and condensing gas furnaces.

How It Works

The pressure switch senses the negative pressure differential created by the inducer motor. When the measured pressure meets or exceeds the -0.80″ WC threshold, the SPST contacts close, signaling the control board that safe draft conditions exist and permitting ignition to continue. If the inducer fails, venting is blocked, or pressure falls outside the acceptable range, the switch opens the circuit and shuts down the heating sequence — protecting the heat exchanger and preventing flue gas spillage.

Key Features

• OEM Nordyne replacement part — direct fit for compatible Nordyne, Miller, Frigidaire, Tappan, and affiliated brand furnaces
• SPST (Single-Pole, Single-Throw) switching action for straightforward circuit integration
• Factory-calibrated setpoint of -0.80″ WC for precise, consistent draft sensing
• Provides critical safety interlock to prevent ignition under unsafe draft conditions
• Durable construction designed to withstand the thermal and pressure cycling demands of residential heating equipment
• SKU: 632495R

Application

Designed as a direct OEM replacement for Nordyne-platform furnaces requiring a -0.80″ WC pressure switch. Always verify compatibility with your specific model number before installation. Consult the unit’s wiring diagram and service manual to confirm correct switch location and circuit connection.

Installation Note

Pressure switch replacement should be performed by a qualified HVAC technician. Before replacing the switch, inspect the inducer motor, pressure tubing, condensate drain, and vent system for blockages or leaks, as these conditions can cause nuisance switch failures.