Honeywell L4017B 1186 Combo Fan and Limit Control

The Honeywell L4017B 1186 is a combination fan and limit control, designed to regulate blower operation and high-limit shutdown in forced-air heating systems. It ensures efficient temperature control and system safety by automatically activating or deactivating the blower and preventing overheating in furnaces, boilers, and industrial heating applications.

Technical Specifications

  • Manufacturer: Honeywell
  • Model: L4017B 1186
  • Control Type: Combination Fan and Limit Control
  • Fan Control Range: Varies depending on system settings
  • Limit Control: High-limit safety shutdown mechanism
  • Switch Type: Bimetallic, temperature-actuated switch
  • Temperature Sensing Element: Helical bimetal coil
  • Reset Type: Automatic
  • Mounting Type: Surface mount
  • Electrical Rating: Varies based on system compatibility
  • Enclosure Type: Designed for furnace and heating system integration

Key Features

  • Combines fan control and high-limit protection in a single unit
  • Activates the blower at a preset temperature for efficient heat distribution
  • Shuts down the system if temperature exceeds safe limits to prevent overheating
  • Reliable bimetallic sensor ensures accurate temperature detection
  • Automatic reset capability restores operation once temperatures normalize
  • Durable construction for long-term use in heating applications

Compatible Honeywell Components

  • Honeywell Thermostats and Heating Controls
  • Honeywell Gas Valves and Burners
  • Forced-Air Furnace and Boiler Control Systems
  • Honeywell Fan and Blower Motors

Industry Applications

  • Residential and commercial HVAC systems
  • Forced-air heating and furnace control
  • Boilers and industrial heating systems
  • Air handling units (AHUs) and ventilation control

Installation & Operational Notes

  • Mount securely in a proper location within the furnace or heating system
  • Ensure correct wiring connections for both fan and limit functions
  • Verify compatibility with system voltage and electrical ratings
  • Regular maintenance and inspection recommended to ensure accurate temperature regulation
  • Designed for safe and efficient heating system operation

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