York S1-025-52056-000 Air Pressure Switch 0.85″ W.C. SPNC

Description

York S1-025-52056-000 Air Pressure Switch Overview

The York S1-025-52056-000 is a genuine OEM air pressure switch engineered for use in York heating systems. Rated at 0.85″ W.C. (inches of water column) and configured as Single Pole Normally Closed (SPNC), this switch monitors combustion air pressure to verify that the draft inducer is operating correctly before allowing the ignition sequence to proceed — a critical safety function in modern gas furnaces.

How It Works

The pressure switch senses negative pressure generated by the draft inducer motor. When adequate airflow is confirmed at the 0.85″ W.C. set point, the switch closes and signals the control board to continue the ignition sequence. If airflow is insufficient or blocked, the switch remains open, locking out the furnace and preventing unsafe operation.

Key Features

• Genuine York OEM replacement part — SKU S1-025-52056-000
• Set point: 0.85″ W.C. (inches of water column)
• Configuration: Single Pole Normally Closed (SPNC)
• Monitors draft inducer airflow for safe furnace operation
• Prevents ignition sequence from proceeding without proper combustion air pressure
• Direct OEM fit for compatible York furnace models

Application

This pressure switch is designed as a direct OEM replacement for compatible York gas furnaces. Always verify compatibility with your specific furnace model number before installation. Proper airflow and venting must be confirmed during installation to ensure accurate switch operation.

Why Choose a Genuine York OEM Part?

Using a genuine York replacement pressure switch ensures correct set-point calibration, proper fit, and reliable safety performance. Aftermarket substitutes may not meet the original design specifications, potentially compromising system safety and warranty coverage.