Description
The Emerson 3F11-100 is a snap disc limit control calibrated to close on a temperature rise with an operating range of 93°F to 107°F and a 30°F differential, making it a practical sensing and switching component for fan control, comfort ventilation, and low-temperature actuation circuits in residential and commercial HVAC equipment. The close-on-rise action means the switch completes the circuit when the sensed surface or ambient temperature climbs to the set point, a configuration commonly used for supply air fan enable controls, heat exchanger warm-up delays, and auxiliary heating equipment sequencing where a minimum temperature threshold must be reached before a blower or secondary device is energized. The 30°F differential defines the temperature drop required after the switch closes before it will reopen, providing a controlled operating band that prevents rapid cycling and protects connected equipment from short-cycling conditions. The disc mounts directly to a duct wall, heat exchanger surface, or equipment panel for accurate contact temperature sensing. Built to Emerson White-Rodgers component standards, the 3F11-100 serves as a reliable OEM-quality replacement across a wide range of furnace and air handler platforms.
Key Features
- Closes on temperature rise with a calibrated set point range of 93°F to 107°F
- 30°F differential provides a controlled operating band to prevent short cycling
- Close-on-rise action suited for fan enable, blower delay, and equipment sequencing circuits
- Direct surface or duct-mount installation for responsive contact temperature sensing
- Snap disc switching action delivers fast, repeatable circuit closure at the set point threshold
- Single-pole switching configuration compatible with standard HVAC control wiring
- Factory-calibrated set point for consistent performance across the operating range
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