This Honeywell Fan Limit Switch (L4064B2210) is a crucial safety component for Brivis ducted gas heaters, designed to protect the unit from overheating. It's a key part for HVAC techs, service teams, and competent DIYers maintaining residential heating systems to keep them running safely and efficiently. On a hot summer day, getting these older gas heaters back online often means troubleshooting safety limits, and having the right part on hand saves a lot of rework.

Acting as both a fan control and a high-limit safety, this 11-inch switch ensures the furnace fan cycles correctly and shuts down the burner if temperatures exceed safe limits, preventing damage and potential hazards.

Best For

• Servicing and maintaining Brivis ducted gas heaters.
• Replacing faulty or worn-out fan limit switches in residential heating systems.
• Preventative maintenance checks for gas furnace safety controls.

Compatibility

This Honeywell Fan Limit Switch (PN: L4064B2210) is specifically designed for use in Brivis gas heating systems. It features an 11-inch probe length, which is critical for proper temperature sensing within the heat exchanger. If you're running a different model or brand, check fittings and specs before ordering.

Features

• Genuine Honeywell component: Ensures reliability and compatibility with specified systems.
• 11-inch probe length: Designed for accurate temperature sensing in Brivis heat exchangers.
• Auto reset function: Automatically restores operation once safe temperatures are re-established.
• Integrated fan and limit control: Manages blower fan operation and provides critical high-temperature protection.

What's in the Box

• 1 x Honeywell Fan Limit Switch (L4064B2210) with 11-inch probe.

Using It on the Job

1. Isolate Power: Always begin by switching off the main power to the gas heating unit at the circuit breaker or isolation switch. Confirm no power with a multimeter.
2. Access Switch: Carefully locate and access the existing fan limit switch, typically found near the heat exchanger or plenum.
3. Document & Disconnect: Take photos of the wiring connections and probe orientation. Disconnect the old switch's wiring and carefully slide out its probe.
4. Install New Switch: Slide the new 11-inch probe fully into its designated sleeve. Ensure it's seated correctly for accurate temperature sensing.
5. Reconnect Wiring: Reconnect all wiring according to your documentation, ensuring all terminals are secure and correctly matched.
6. Restore & Test: Restore power to the unit. Initiate a heating cycle and monitor the fan operation and observe if the unit cycles off correctly at its set points, confirming proper installation.

Limitations & Safety Notes

• Installation and service of gas appliances should only be performed by a qualified and licensed technician.
• This switch is specifically for Brivis gas heaters; verify compatibility and probe length (11 inches) before purchase.
• Always follow manufacturer's installation instructions and local gas fitting and electrical codes.
• Ensure proper lockout/tagout procedures are followed when working on electrical components.

Tradie Pro Tip: When replacing a fan limit switch, always check the probe's cleanliness and ensure it slides smoothly into its sleeve. A build-up of dust or corrosion can prevent accurate temperature readings, leading to nuisance trips or improper fan operation. Also, verify the air filter is clean and airflow is unrestricted after the repair.

Pair With

For comprehensive Brivis heating system maintenance, consider pairing this switch with other Brivis spare parts like Brivis control boards, Brivis ignitors & sensors, or Brivis gas valves. Always check the system's air filters too for optimal performance.