Description
The Honeywell RM7840L1018 is a microprocessor-based integrated burner control and flame safeguard primary relay module engineered for automatically fired gas, oil, or combination fuel single-burner industrial combustion systems. Operating as the core supervisory logic unit of the Honeywell 7800 SERIES, the RM7840L1018 provides complete burner sequencing, automatic ignition, flame supervision, system status indication, system or self-diagnostics, and safety shutdown functionality. Designed to meet strict Original Engineering standards, this relay module supports valve proving logic, expanded annunciation, and customizable pre-purge intervals to prevent unburned fuel accumulation and optimize combustion safety.
TECHNICAL SPECIFICATIONS
Manufacturer: Honeywell
Product Line: 7800 SERIES
Model Number: RM7840L1018
Component Type: Burner Control Relay Module / Primary Flame Safeguard
Supply Voltage: 120 Vac (+10% / -15%)
Operating Frequency: 50/60 Hz (±10%)
Power Consumption: 10 VA Maximum
Ambient Operating Temperature: -40 °C to +60 °C (-40 °F to +140 °F)
Ambient Storage Temperature: -40 °C to +66 °C (-40 °F to +150 °F)
Operating Humidity Range: 0% to 85% RH (Non-condensing)
Vibration Resistance: 0.5G continuous
Weight: 0.73 kg (1.6 lbs)
Physical Dimensions: 127 mm x 127 mm x 92 mm
Flame Failure Response Time (FFRT): 0.8 seconds to 3.0 seconds (Amplifier dependent)
Pilot Flame Establishing Period (PFEP): 4 seconds or 10 seconds (Selectable)
Main Flame Establishing Period (MFEP): 10 seconds or 15 seconds
Pre-Purge Timing: Configurable via ST7800 Plug-in Purge Timer (2 sec to 30 min)
Postpurge Timing: 15 seconds fixed
Enclosure Protection Rating: NEMA 1 (IP40 indoor installation)
Diagnostic Indicators: 5 Line-Powered Operational Status LEDs (Power, Pilot, Flame, Main, Alarm)
Communication Protocol: Modbus RTU interface via S7810A Data ControlBus Module
Safety Approvals: UL Listed (File MP268), CSA Certified (LR95329-3), FM Approved, IRI Acceptable, CE Compliant
FUNCTIONAL ARCHITECTURE AND SAFETY LOGIC
Microprocessor-controlled architecture executes dynamic self-checking logic over 60 times per second to detect hardware faults, relay welding, and component drift.
Integrates programmable interrupted or intermittent pilot sequences with high-fire purge verification and low-fire start interlocks.
Valve Proving System (VPS) functionality tests gas safety shutoff valves for seat leakage prior to burner ignition or immediately following cycle completion.
Non-volatile memory retains lockout status, total hours of operation, burner cycles, and the last six fault events through power interruption.
Five-point LED annunciation displays real-time operational sequencing and rapid fault isolation without external test meters.
SYSTEM ACCESSORIES AND TECHNICAL COMPATIBILITY
Mounting Subbase: Honeywell Q7800A1005 (2-wire), Q7800B1003 (4-wire), or Q7800F universal base assemblies.
Flame Amplifiers: Full Technical Compatibility with Honeywell R7847 (Rectification), R7849 (Ultraviolet), R7861 (Self-Check UV), and R7886 (Optical/Infrared) amplifiers.
Purge Timing Cards: Requires ST7800A series plug-in purge card for sequence initiation.
User Interface: Compatible with S7800A1001 Keyboard Display Module (KDM) for real-time text-based diagnostics, flame signal monitoring, and annunciator history.
Remote Reset: Supports external electrical reset via push button or communications bus.
INDUSTRIAL APPLICATION SCENARIOS
The Honeywell RM7840L1018 solves safety, compliance, and unscheduled downtime challenges in severe industrial heating environments:
Industrial Steam Boilers and Thermal Fluid Heaters: Prevents catastrophic fuel accumulation during cold-start sequences and cycling operations in heavy manufacturing.
Metallurgical Furnaces and Heat-Treating Lines: Delivers rapid flame failure response and precise interlock supervisory logic during multi-stage firing shifts.
Process Air Heaters and Thermal Oxidizers: Eliminates intermittent false lockouts caused by electrical noise or line fluctuation through advanced signal filtering and ruggedized component design.
COMMERCIAL LOGISTICS
Condition: 100% Factory New, Original Engineering Unit
Packaging: Original sealed industrial packaging with complete technical documentation
Standard Lead Time: In stock for immediate dispatch; global expedited transit available
Quality Assurance: Factory calibrated and tested for critical process safety infrastructure
Key Attributes
Type: Gas Burner
Warranty: 6 Month
Video outgoing-inspection: Provided
Machinery test report: Not Available
Weight (kg): 2
Place of origin: Guangdong, China
Brand name: Honeywell
Product name: Burner program controller
Brand: Honeywell
Model: RM7840A1018
Adapter burner: Gas burner
Weight: 2kg
Usage: Gas Burner Accessories
After Warranty Service: Video Technical Support
Condition: New100%
Function: Burner Boiler System
Application: Boiler System
Packaging and Delivery
Selling Units: Single item
Single package size: 30X30X30 cm
Single gross weight: 2.500 kg
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