The Honeywell RM7850A1027 is a microprocessor-based integrated burner control and flame safeguard relay module designed for automatically fired gas, oil, or combination fuel single-burner applications. Part of the 7800 Series, this unit controls pre-purge, pilot/main flame ignition, run sequence, and safety shutoff, providing diagnostic LEDs and communication capabilities for commercial and industrial combustion systems.
Technical Details
- Model / Part Number: RM7850A1027
- Manufacturer / Brand: Honeywell
- Product Line: 7800 Series Flame Safeguard Controls
- Module Type: Full-Function Microprocessor Relay Module
- Supply Voltage: 120 VAC (+10% / -15%), 50/60 Hz
- Power Consumption: 10 W Maximum
- Pre-Purge Period: Configurable via ST7800 Plug-In Purge Timer Card
- Flame Amplifier: Requires Plug-In R7800 Series Flame Signal Amplifier
- Mounting Base: Q7800A, B, or C Wiring Subbase
- Operating Temperature: -40°C to 60°C (-40°F to 140°F)
- Storage Temperature: -40°C to 65°C (-40°F to 150°F)
- Relative Humidity: 0% to 85% Non-Condensing
- Approvals / Standards: UL Listed, CSA Certified, FM Approved
- Shipping Weight & Dimensions: 2.0 lbs | 7 x 5 x 3 Inches
- Alternate Part Numbers: RM7850A1027, RM7850A1027/U, 7800 RM7850A1027
Key Features
- Microprocessor-Based Safety: Delivers precise sequence timing, self-diagnostics, and automatic flame control to prevent unburned fuel buildup.
- Status & Diagnostic LEDs: Onboard LED indicators signal system status (Power, Fault, Purge, Flame, Pilot, Main) for rapid visual troubleshooting.
- Modular Component Architecture: Integrates with plug-in ST7800 purge cards, R7800 flame amplifiers, and optional S7800 keyboard display modules.
- Fault History Retention: Non-volatile memory stores lockout history, run cycles, and error codes even after total power loss.
- Expanded Valve Proving Support: Supports automated valve proving system (VPS) testing for enhanced fuel line safety.
Applications
- Primary flame safeguard control for commercial boilers, industrial furnaces, and process water heaters.
- Automatic gas, oil, or dual-fuel single-burner management installations.
- Direct replacement and maintenance servicing for Honeywell 7800 Series burner control systems.
We ship this product worldwide! Delivery is normally stock.
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