Description
Honeywell L4029E1011 High Limit Reset Control Overview
The Honeywell L4029E1011 is a high limit reset control engineered to provide critical fire-safety protection in forced-air heating systems. When air temperature rises to a level indicative of fire or dangerous overheating, this control automatically shuts off the supply fan, preventing the spread of heated air and protecting building occupants and equipment. Its manual reset design ensures that a technician must physically inspect and clear the fault condition before the system is returned to normal operation — a key safety feature for commercial and residential HVAC applications.
Key Features
- 135°F high limit stop — shuts off the fan when air temperature reaches a level indicative of fire
- 3″ element insertion length for accurate duct or plenum sensing
- Normally Closed (NC) SPST switching action
- Requires manual reset — prevents automatic restart after a high-limit trip event
- Designed for use in forced-air heating systems, air handlers, and duct applications
- Reliable Honeywell construction for long service life
Safety & Operation
The L4029E1011 operates as a normally closed device under normal conditions, allowing the fan circuit to remain energized. Upon detecting an air temperature at or above the 135°F high limit setpoint — a condition that may indicate a fire or severe system malfunction — the control opens the circuit and shuts down the fan. Because manual reset is required, the system cannot restart until a qualified technician has assessed and resolved the underlying cause, ensuring safe and compliant system operation.
Typical Applications
- Forced-air furnaces and air handlers
- Supply air duct high-limit protection
- Commercial and residential HVAC systems requiring fan shutdown on high-temperature detection
- Fire and overheat safety control circuits
Specifications
- SKU / Part Number: L4029E1011
- Brand: Honeywell
- High Limit Stop: 135°F
- Element Insertion Length: 3″
- Switch Type: Normally Closed (NC) SPST
- Reset Type: Manual Reset
- Function: Shuts off fan when air temperature is indicative of fire
Reviews
There are no reviews yet.