Resideo L4064B2210 Controller

The Resideo L4064B2210 Fan and Limit Controller is a critical component for regulating forced warm air heating systems, providing integrated control over blower motor activation and high-limit safety protocols. This universal furnace fan limit switch features an 11.5-inch element insertion length, making it ideal for large plenum applications where accurate temperature sensing is required. Engineered for reliability, the switch logic ensures the fan switch makes and the high limit switch breaks on temperature rise. With an operating temperature range of -40°F to 190°F and a fixed 25-degree high limit differential, this controller maintains precise thermal boundaries to prevent heat exchanger damage. Designed as a direct replacement for 1149508, it offers flexible installation via surface or universal mounting brackets. This Honeywell Home L4064B2210 model allows for manual fan control and adjustable fan-on/fan-off settings, ensuring professional-grade performance for residential and light commercial HVAC service.

• Precise Thermal Control: Features an adjustable fan limit setting to optimize blower cycles and improve system efficiency.
• Durable Construction: The 11-1/2 inch bimetal sensing element provides rapid response to plenum temperature fluctuations.
• Universal Compatibility: Includes mounting hardware for seamless integration into various HVAC furnace controls.
• Safety Redundancy: Independent high-limit circuit provides essential overheat protection for the heat exchanger.

What is the purpose of the manual fan switch on the Resideo L4064B2210?
The manual switch allows the contractor or end-user to set the fan to "On" for continuous circulation or "Auto" for thermostatically controlled operation.

Can this unit replace older Honeywell L4064 series controllers?
Yes, the Resideo L4064B2210 is designed to replace most L4064 models with similar insertion lengths, including the 1149508 unit.

How do I adjust the fan-on and fan-off setpoints?
Adjustments are made by moving the hardware indicators on the internal scale to the desired temperatures, ensuring the fan initiates and terminates based on specific plenum heat levels.

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.