Honeywell RM7840L1018 Relay Module
$2,350.00
The Honeywell RM7840L1018 is a microprocessor-based programming burner control module designed for automatically fired single-burner gas, oil, or dual-fuel systems. Operating on 120V AC, it manages safety pre-purge timing, ignition sequencing, firing rate motor control, and continuous flame supervision across industrial boilers and furnaces.
1 in stock
Description
- Microprocessor Primary Control: Provides automated sequencing, safety pre-purge, pilot ignition trial, main flame trial, and post-purge timing for single-burner gas, oil, or multi-fuel equipment.
- Full Firing Rate Control: Coordinates high-fire purge proving and low-fire start interlocks with modulating damper motors to ensure proper airflow before ignition.
- Modular System Architecture: Requires a Q7800 wiring subbase, an ST7800 plug-in purge timer card, and an R78 series flame amplifier for tailorable fuel and timing configurations.
- Five Diagnostic Status LEDs: Includes front-panel LEDs for Power, Pilot, Flame, Main, and Alarm to deliver instant visual feedback on sequence stages and fault conditions.
- Five-Function Run/Test Switch: Allows technicians to pause the burner sequence during pre-purge or ignition testing to verify air switches and fuel valve positioning.
- Non-Volatile Memory Retention: Stores historical fault files, cycle counts, and lockout cause codes permanently, even during complete line voltage outages.
- Expanded Diagnostics & Communications: Supports optional S7800 Keyboard Display Modules (KDM) and Modbus communication cards for real-time data logging and remote monitoring.
Documentation
No documentation is available for this product.
Technical Specifications
| Part Number | RM7840L1018 |
|---|---|
| Manufacturer | Honeywell |
| Voltage | 120 Vac |
| Frequency | 50 Hz; 60 Hz (±10%) |
| Interlocks | Lockout; LHL-LF & HF Proven |
| Safety Integrity Level | SIL Capable 3 |
Request a Quote
"*" indicates required fields
Description
The Honeywell RM7840L1018 7800 Series Programming Burner Control is an advanced, microprocessor-based primary flame safeguard relay engineered to automate burner startup, firing, and shutdown sequences on gas, oil, or combination fuel single-burner applications. Serving as the primary intelligence in industrial combustion systems, the RM7840L1018 executes precise timing loops for pre-purge, pilot flame trial, main flame trial, and post-purge while monitoring critical safety interlocks such as airflow switches and high/low fire positions. Operating on 120V AC power, this full-featured programming control requires a Q7800 wiring subbase, an ST7800 plug-in purge timer card, and an R78 series flame signal amplifier to build a customized combustion safeguard solution. With onboard status LEDs, a five-function Run/Test switch, non-volatile diagnostic memory, and compatibility with the S7800 Keyboard Display Module, the RM7840L1018 delivers fail-safe flame supervision, simplified field troubleshooting, and maximum operational safety across commercial boilers, process heaters, and thermal incinerators.
Frequently Asked Questions
What is the primary function of the Honeywell RM7840L1018 programming burner control?
The RM7840L1018 is a microprocessor-based flame safeguard relay that manages automated burner sequencing, safety purge timing, ignition control, firing rate damper positioning, and continuous flame supervision on single-burner gas, oil, or dual-fuel equipment.
Which modular components are required to operate the RM7840L1018 control unit?
The RM7840L1018 relay module requires three additional modular components: a Q7800 wiring subbase, a plug-in ST7800 purge timer card (which determines the pre-purge duration), and a compatible R78 Series plug-in flame signal amplifier paired with a flame scanner or rod.
Which flame detectors can be connected to the Honeywell RM7840L1018?
Flame sensor compatibility is determined by the installed R78 series plug-in amplifier module. When fitted with the appropriate amplifier, the RM7840L1018 supports optical ultraviolet (UV) scanners, flame rod rectification sensors, infrared (IR) detectors, and dynamic self-checking UV scanners.
How does the five-function Run/Test switch assist in system commissioning?
The Run/Test switch allows field technicians to freeze the burner control sequence in specific positions, such as pre-purge or pilot trial for ignition. This enables safe testing of airflow interlocks, pilot flame alignment, and fuel valve operation without advancing to main firing.
Does the RM7840L1018 retain lockout history during power loss?
Yes, the RM7840L1018 utilizes non-volatile onboard memory to save all operating history files, cycle counts, run hours, and lockout cause codes, ensuring data is retained even during power outages.
