Honeywell, Q340A1066/U, Thermocouple, 1400 deg F(Hot), 780 deg F (Cold)

Honeywell Q340A1066/U – 18" Thermocouple with Push-In Clip and Male Connector Nut

The Honeywell Q340A1066/U is an 18-inch thermocouple designed for use in standing pilot gas systems. It generates a 30 millivolt signal in response to sustained pilot flame presence, enabling control of gas flow through compatible safety valves. The thermocouple features a copper sheath, durable construction for high-temperature applications, and includes a push-in retaining clip for secure pilot burner mounting.

Commonly used in furnaces, water heaters, and boilers, this thermocouple is designed for replacement and service in gas-fired equipment requiring a millivolt safety circuit.

Key Features

• Millivolt Output: Produces 30 mV when exposed to flame to maintain pilot safety circuit
• Connection: Includes 11/32" male connector nut for gas valve interface
• Mounting Clip: Push-in style clip included for standard pilot burner assemblies
• High-Temperature Capability: Rated for 760°C at the hot junction, 416°C at the cold junction
• Construction: Copper-sheathed thermocouple designed for durability in elevated temperatures

Technical Specifications

• Length: 18 inches
• Voltage Output: 30 millivolts (nominal)
• Resistance: 0.02 ohms
• End Style: 11/32" male connector nut
• Mounting Hardware: Push-in clip (included)
• Application: Standing pilot systems in gas-fired appliances

Installation Notes

This thermocouple should be installed by qualified HVAC or plumbing technicians. Ensure the sensing tip is correctly positioned in the pilot flame and that all connections are properly tightened. Compatibility with the gas valve must be confirmed before installation. Use of OEM or approved replacement parts is recommended for compliance with safety standards.

Typical Applications

• Gas-fired furnaces with standing pilot ignition
• Residential and commercial water heaters
• Boilers with pilot flame safety controls