Honeywell RM7840L1026 Relay Module Burner Control

The Honeywell RM7840L1026 is a microprocessor-based integrated burner control module designed for use in single-burner gas, oil, coal, or combination fuel systems. This control provides advanced safety and operational functionality beyond conventional burner controls. It offers full sequencing, flame supervision, status indication, diagnostics, and compatibility with a wide range of Honeywell flame detection components.

Technical Specifications

• Model: RM7840L1026
• Series: RM7800
• Voltage: 120V AC (+10%, -15%)
• Frequency: 50/60 Hz
• Application: Automatically Fired Single-Burner Systems
• Pilot Type: Intermittent
• Flame Detection: Compatible with UV, IR, and flame rod via amplifier
• Flame Establishing Period – Pilot: 4 or 10 seconds
• Flame Establishing Period – Main: Intermittent
• Run/Test Switch: 5-position for system testing and diagnostics
• PrePurge: Configured via ST7800A Purge Timer (sold separately)
• PostPurge: Configurable (based on programmer and timer module)
• Mounting: Requires Q7800A or Q7800B Subbase
• LED Indicators: 5 LEDs for sequence status and diagnostics
• Nonvolatile Memory: Retains system history, flame signal data, and lockout conditions
• Condition: New

Key Features

• Fully integrated burner sequencing and flame safeguard
• Supports automatic startup, operation, and safety shutdown
• LED indicators provide real-time operating and fault condition status
• Access points available for external voltage checks and signal verification
• Accepts interchangeable plug-in flame amplifiers for flexibility
• Nonvolatile memory stores lockout and runtime history for diagnostics
• Compatible with local or remote annunciators and reset modules
• Modular design allows rapid replacement and easy integration

Compatible Accessories

• Q7800A / Q7800B Subbase
• ST7800A Purge Timer Module
• R7847, R7848, R7849, R7851, R7852, R7861, R7886 Flame Amplifiers
• S7800A Keyboard Display Module
• S7830 Expanded Annunciator
• S7810 Communication Modules

Industry Applications

• Gas, oil, or coal-fired burners in industrial boiler rooms
• Commercial heating and process burner systems
• Automated combustion equipment requiring integrated sequencing
• Combustion safety systems with diagnostic capability

Installation & Maintenance Notes

• Mount on approved subbase with compatible amplifier
• Use Run/Test switch to perform functional checks and troubleshooting
• Monitor LED indicators for sequence progress and fault alerts
• Periodically verify flame signal strength and amplifier condition
• Review stored lockout and history logs for maintenance planning