Description
Description
The Honeywell L4064B2210 is a combination fan‑and‑limit controller used in forced warm‑air heating systems to manage blower operation and protect the furnace from overheating. It uses a helical bimetal sensing element inserted 11.5 inches into the plenum to monitor temperature and automatically turn the fan on as the plenum warms and off as it cools. The device also provides high‑limit shutdown, cutting power to the burner if temperatures exceed the set safety threshold. It includes three wiring terminal options, push‑in and female receptacle connections, auxiliary screw terminals, and field‑adjustable fan and limit settings, with a manual fan override on L4064B models for continuous blower operation. TRADELINE versions add mounting adapters and strain‑relief bushings to simplify installation and protect wiring.
Features
- Controls both fan and high‑limit functions in forced‑air furnaces, managing blower operation and providing over‑temperature protection.
- Helical bimetal sensing element that turns the fan on and off based on plenum temperature.
- Three wiring terminal options for flexible installation.
- Push‑in receptacles for stripped wire and female receptacles for 1/4‑inch male flag connectors.
- Auxiliary screw terminals for additional wiring needs.
- Field‑adjustable fan and high‑limit settings to match system requirements.
- Manual fan override switch (on L4064B models) to keep the blower running continuously.
- TRADELINE version includes mounting adapters for easier replacement and strain‑relief bushings to protect wiring.
- High‑limit stop preset at 200°F (93°C) for safety.
- Compact housing (approx. 4 9/32" × 3" × 1 19/32", excluding element) suitable for standard furnace installations.
