Description
Lennox 24W98 Pressure Switch Overview
The Lennox 24W98 is an OEM-quality pressure switch engineered for use in Lennox heating systems. Designed to monitor and verify proper draft pressure during furnace operation, this switch provides a critical safety interlock that helps prevent unsafe or inefficient combustion conditions. Its straightforward SPST (Single-Pole, Single-Throw) design ensures reliable open/close switching action at a precise setpoint.
Key Specifications
- SKU / Part Number: 24W98
- Brand: Lennox
- Setpoint: -0.31″ w.c. (inches water column)
- Switch Type: SPST (Single-Pole, Single-Throw)
- Connection Type: 1/4″ barb
Features & Benefits
- Precise -0.31″ w.c. setpoint ensures accurate draft pressure sensing for safe furnace operation
- SPST switching action provides a clean, reliable circuit open or close response
- 1/4″ barb connection allows for secure, leak-resistant hose attachment to the pressure port
- Direct OEM replacement for compatible Lennox furnace models — no modifications required
- Helps protect the heat exchanger and combustion system by confirming adequate inducer draft before allowing ignition
Application
This pressure switch is intended for use as a replacement component in Lennox gas furnaces equipped with an induced-draft or condensing blower assembly. It monitors negative pressure created by the draft inducer motor. If the required pressure level is not achieved — indicating a blocked flue, failed inducer, or other fault — the switch remains open, preventing the ignition sequence from proceeding and protecting the system and occupants.
Installation Notes
- Always verify compatibility with your specific Lennox furnace model before installation
- Disconnect power to the unit before servicing or replacing the pressure switch
- Ensure the 1/4″ barb hose connection is secure and free of cracks or blockages
- Consult the furnace service manual for proper wiring and diagnostic procedures
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