L404 Series
PressureTrol® Controllers
Rugged mechanical controllers for reliable pressure and vacuum monitoring in industrial steam, air, and gas systems.
Series Overview
The Honeywell L404 Series (PressureTrol®) is a family of mechanical pressure and vacuum controllers designed for industrial systems requiring reliable pressure monitoring, regulation, and safety protection.
This series is widely used in steam, air, gas, and fluid systems, providing dependable pressure control through adjustable setpoints and rugged mechanical design.
Functional Role in Industrial Systems
L404 Series pressure controllers are commonly applied in:
- Steam boiler pressure control and monitoring
- Industrial air and gas pressure systems
- HVAC and burner system pressure regulation
- High-pressure and low-pressure limit protection
- Vacuum and pressure combined monitoring applications
Key Differences
Key Features & Selection
Although all L404 models share a mechanical PressureTrol® design, variations exist in:
- Pressure Range: Options for low, standard, and high-range pressure sensing.
- Control Function: Configurable as operating control or limit control.
- Sensing Capability: Models for pressure only, vacuum only, or combined pressure/vacuum.
- Application Focus: Specialized for boilers, burners, HVAC, or fluid systems.
These variations allow engineers to select precise control solutions for different system requirements.
Applications
- Steam boiler pressure control
- Industrial air & gas systems
- HVAC pressure regulation
- High/Low pressure limit protection
- Vacuum monitoring
Model Comparison
| Model | Control Type | Pressure Function | Typical Use |
|---|---|---|---|
| L404F1060 | Operating Control | Pressure | Steam / air / gas systems |
| L404F1094/U | Operating Control | High-Range Pressure | Heavy-duty systems |
| L404F1102/U | Operating Control | Adjustable Pressure | HVAC & boiler |
| L404T1063/U | High-Limit Control | Pressure | Oil burner safety |
| L404V1087/U | Vacuum / Pressure | Combined | Industrial gas monitoring |
| L404V1095/U | Vacuum Control | Low Pressure | HVAC & gas systems |
Operating Control
Standard pressure regulation for steam, air, and gas systems.
High Limit
Safety limit controls for overpressure protection.
Vacuum Control
Specialized for vacuum or combined pressure/vacuum monitoring.
High Range
Designed for heavy-duty systems requiring higher pressure setpoints.
All L404 Series Models
Pressure Control
High Pressure
Limit Control
Vacuum Control
Need Pressure Controllers?
Contact our engineering team for L404 Series specifications and replacement options.