White-Rodgers 3L09-5 Heating Limit Control

White-Rodgers 3L09-5 Heating Limit Control delivers precise overheat protection for residential and commercial heating systems. This Therm-O-Disc Type 36T unit, Therm-O-Disc Style 612706, mounts on a board and uses a 1/2 inch bimetal disc to sense temperature and reliably open or close at preset limits. With voltage options of 120/240/277 VAC for resistive loads and 120/240 VAC for inductive loads, it covers a wide range of furnace and boiler applications.

Electrical ratings provide robust protection: 15 A at 120 V, 13 A at 240 V, and 9.3 A at 277 V (resistive); inductive ratings include 5.8 A full load and 13 A locked rotor at 240 V, plus 34.8 A locked rotor at 120 V. Temperature ratings are 160°F open and 140°F close, with a panel setting L160-20F for precise control. The board-mount design and a compact 3.12 inch length make installation straightforward in tight spaces.

• Therm-O-Disc Type 36T with a 1/2 inch bimetal disc enables fast, accurate temperature sensing.
• Board-mount design simplifies wiring and protects against loose connections in compact HVAC layouts.
• Wide electrical compatibility covers 120/240/277 VAC for resistive loads and 120/240 VAC for inductive loads.
• Comprehensive current ratings ensure safe operation: up to 15 A at 120 V, 13 A at 240 V (resistive), with higher and locked-rotor allowances.
• Temperature control features Open at 160°F and Close at 140°F, with panel setting L160-20F.