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Lennox 14T66 Pressure Switch

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Special Price $84.16 Regular Price $133.95
In stock
SKU
14T66
The Lennox 14T66 is a Combustion Air Pressure Switch Kit, an essential part of your downflow gas furnace. This is specifically helpful in that it performs the duty of a safety guard by measuring the air pressure that gets into the combustion chamber. That way, air circulation is enabled where it is safe to burn fuel and the butterfly is used to maintain the required flow. If the pressure drops down to a dangerous level at 0.25 WC, the switch stops the supply of gas to avoid mishaps and risks.
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HVAC Controls & Electrical, Switches, Pressure Switches
Manufacturer:
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Specifications

  • Weight:0.48lbs
  • Measure: Unit
  • Type: Combustion Air Pressure Switch Kit
Manufacturer Name: Lennox
Product Number: 14T66
OEM Part Number: 14T66
Product Description: Pressure Switch
Weight:0.48lbs/217.72g

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Product Questions (2)
Customer Questions
What maintenance is required for the Lennox 14T66 Pressure Switch?

Inspect pressure ports and tubing for blockages or cracks. Check electrical connections and continuity, and clean moisture or debris buildup to ensure accurate switching and accurate operation. Always isolate power before servicing to prevent electrical or gas furnace hazards.

What are common issues with the Lennox 14T66 Pressure Switch?

  • Clogged pressure ports causing switch failure.
  • Cracked or disconnected tubing lines.
  • Electrical contact failure or intermittent switching.
  • Moisture contamination inside switch housing.
  • Inaccurate pressure sensing leading to shutdowns.
  • Stuck pressure diaphragm inside unit.

Installation Steps

Step 1: Turn off unit power and gas supply, ensuring the system is fully de-energized.

Step 2: Remove access panel and locate existing pressure old switch and tubing connections.

Step 3: Label and disconnect wires and hoses carefully to preserve orientation.

Step 4: Mount new switch in the same position and ensure correct pressure port alignment.

Step 5: Reconnect tubing and electrical terminals securely, checking for tight seals.

Step 6: Restore power and test ignition cycle, confirming proper draft sensing and safe shutdown operation.