8" Insertion Fan and Limit Controller with 125 F fan on/100 F fan off, 200 F high limit

The Honeywell L4064B2236 Fan and Limit Controller provides precise temperature control and system protection for warm air furnace applications.

Engineered for dependable operation and easy installation, the Honeywell L4064B2236 regulates blower fan operation and acts as a high-limit safety control in warm air furnaces. This model features an 8-inch insertion element and is factory set to activate the fan at 125°F, turn it off at 100°F, and limit high temperature at 200°F. Designed for durability and reliability, it ensures consistent comfort and safe furnace operation.

• Model number L4064B2236 identifies the Honeywell Fan and Limit Controller with an 8-inch insertion length and factory-set temperature limits.
• Designed for warm air furnaces to control blower operation and prevent overheating.
• Combines both fan control and high-limit safety functions in a single compact unit.

Technical Data & Performance

• Product Type: Fan and Limit Controller.
• Insertion Length: 8 inches – provides accurate sensing within the furnace plenum.
• Fan Control Settings: Fan On: 125°F (52°C); Fan Off: 100°F (38°C).
• High Limit Setting: 200°F (93°C) fixed – automatically shuts down the burner if air temperature exceeds limit.
• Switch Type: SPST fan control / SPST limit switch combination.
• Electrical Ratings: Rated for typical furnace blower and burner circuits (up to 8A @ 120V AC resistive load).
• Application: Controls blower fan operation and provides high-temperature safety protection in forced warm air furnaces.
• Temperature Range: Up to 200°F (93°C) operating range.
• Differential: Adjustable fan differential to optimize blower cycling and comfort (factory set as noted).
• Construction: Metal sensing element and durable plastic housing for long service life and temperature stability.
• Mounting Type: Surface mount with insertion probe extending into furnace plenum.
• Connection Type: Terminal screw connections for secure wiring.
• Reset Type: Manual reset on high limit for added safety and compliance.
• Operating Voltage: 120V AC typical.
• Ambient Operating Range: -40°F to 190°F (-40°C to 88°C).
• Function: Turns the blower on when the furnace plenum reaches the set temperature, turns it off when temperature drops, and shuts down burner at high limit.
• Safety Feature: Prevents furnace overheating and damage to components.
• Installation: Standard retrofit or OEM installation with mounting plate and adjustment dial access.
• Compliance: Meets UL and CSA standards for furnace safety controls.
• Maintenance: Minimal maintenance required; inspect periodically during system service.
• Warranty: Backed by Honeywell’s Limited Manufacturer’s Warranty ensuring reliability and performance.