White-rodgers 3l09-15 Bimetal Disc Board Mount Limit Control

Product Description

The WHITE-RODGERS 3l09-15 is a bimetal disc board mount limit control designed to protect heating equipment from overtemperature conditions. It opens at 260 degrees F and automatically resets by closing at 230 degrees F, providing reliable thermal cutout and auto-recovery in a single compact device. The unit mounts directly to the control board and uses a bimetal disc mechanism to deliver high-speed contact separation when the setpoint is reached. Licensed HVAC technicians install this type of limit control as part of furnace and air handler safety circuits to shut down burner or blower operation before damage occurs.

This limit control is suited for residential and light commercial heating applications where a board-mounted thermal safety device is required. It fits installations where the 0.5-inch body size and auto-reset bimetal disc style are specified by the OEM design. The 260 degrees F open and 230 degrees F close differential makes it appropriate for furnace heat exchanger protection and similar thermal monitoring points in forced-air heating systems.

Key Features

• Opens at 260 degrees F for reliable overtemperature protection
• Auto-resets by closing at 230 degrees F, no manual reset required
• High-speed contact separation reduces arcing and extends contact life
• Board mount design simplifies installation directly to the control board
• Bimetal disc construction provides consistent, repeatable thermal response
• 0.5-inch body size fits space-constrained mounting locations

Compatibility

Designed as an OEM-style replacement for board-mounted bimetal disc limit controls in residential and light commercial forced-air heating equipment.

Installation Notes

Installation of this limit control should be performed by a licensed HVAC technician. Always shut off power to the unit at the disconnect and allow the system to cool before removing or installing any limit control. Verify the replacement part matches the original open and close temperature ratings before completing the installation. Follow all applicable local mechanical and electrical codes during service.

Technical Specifications

• Open Temperature: 260 degrees F
• Close Temperature: 230 degrees F
• Body Size: 0.5 inches
• Length: 3.12 inches
• Mount Type: Board Mount
• Disc Type: Bimetal Auto-Reset

Standard Information

• Brand: WHITE-RODGERS
• Manufacturer Part Number: 3l09-15