Description
Nordyne 632477R SPST Pressure Switch — -0.70″ WC
The Nordyne 632477R is an OEM replacement SPST (Single Pole, Single Throw) pressure switch engineered to protect your furnace by monitoring draft inducer performance. Set at a precise -0.70″ WC (inches water column), this switch verifies that adequate negative pressure is established before allowing ignition to proceed — a critical safety function in modern induced-draft and condensing gas furnaces.
Key Features
- OEM Nordyne replacement part — direct-fit for compatible Nordyne, Miller, Frigidaire, and affiliated brand furnaces
- SPST (Single Pole, Single Throw) switching action for reliable open/close pressure sensing
- Factory-calibrated set point of -0.70″ WC (inches water column)
- Monitors draft inducer airflow to prevent unsafe ignition conditions
- Helps protect heat exchanger integrity by confirming proper venting before burner operation
- Durable construction for long service life in residential and light commercial applications
How It Works
The pressure switch is connected via a hose to the draft inducer housing or collector box. When the inducer motor starts, it creates a negative pressure. Once that pressure reaches or exceeds the -0.70″ WC threshold, the SPST switch closes, signaling the control board that safe venting conditions exist and allowing the ignition sequence to continue. If pressure is insufficient — indicating a blocked flue, failed inducer, or restricted vent — the switch remains open and locks out the furnace, protecting occupants from combustion hazards.
Application
- Designed for use in Nordyne-branded furnaces and affiliated product lines
- Suitable for induced-draft and condensing gas furnace applications
- Ideal for HVAC technicians performing routine maintenance, diagnostics, or warranty repairs
Specifications
- Part Number: 632477R
- Brand: Nordyne
- Switch Type: SPST (Single Pole, Single Throw)
- Set Point: -0.70″ WC (inches water column)
- Function: Draft pressure safety switch
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