Resideo L4064B2228 Controller

The Resideo L4064B2228 Fan and Limit Controller is a critical safety and operational component designed for forced warm air heating systems. Featuring a 5-inch bimetal sensing element, this controller provides precise monitoring of plenum temperatures to manage fan cycles and high-limit safety cutouts. This unit functions with a fan switch that "makes" on temperature rise and a high-limit switch that "breaks" on temperature rise, utilizing a 25°F fixed high-limit differential to prevent short-cycling. As a direct Honeywell Home replacement for legacy models like the L4069C1009 and 626436R, it simplifies field service and retrofits. The L4064B2228 operates within a broad range of -40°F to 190°F and supports surface or universal mounting configurations. Integrating this furnace fan limit switch ensures optimal blower timing, improving total system efficiency and protecting the heat exchanger from overheating conditions.

Key Benefits for HVAC Contractors:

• Broad Compatibility: Serves as a versatile universal fan performance control for standard and legacy furnace applications.
• Reliable Temperature Sensing: The 5" insertion element offers fast response times to plenum temperature fluctuations.
• Simplified Installation: Includes mounting adapters and a strain relief bushing to streamline wiring and mounting in tight furnace cabinets.
• Dual Functionality: Manages both blower motor activation and safety high limit protection in a single, compact housing.
• Industrial Build Quality: Built to Resideo OEM standards for high-cycle reliability in residential and light commercial environments.

Common Questions:

How do you set the fan on/off temperatures on the L4064B2228?
The fan timing is adjusted by moving the dial pointers to the desired "Fan Off" and "Fan On" setpoints. Ensure the high-limit pointer is set according to the furnace manufacturer's safety specifications.

Can this model replace the L4064B with a different insertion length?
This L4064B2228 has a 5-inch element. While it can replace shorter elements if the plenum depth allows, always verify that the bimetal sensor is positioned correctly in the main air stream for accurate readings.

What does the manual fan switch do?
The manual switch allows the technician or homeowner to override the thermostat and run the blower continuously for air circulation, bypassing the bimetal sensing element's "on" setpoint.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.