Honeywell RM7890B1014/U
Honeywell RM7890B1014/U
Honeywell RM7890B1014/U
Honeywell RM7890B1014/U

Honeywell RM7890B1014/U | Gas/Oil Burner Safety Controller for Combustion Systems

  • Brand: Honeywell
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    Model: RM7890B1014/U
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    Product Type: Burner Control Module
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    Series: RM7890 Series (Industrial Burner Management)
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    Core Function: Manages ignition sequencing, flame supervision, and safety interlocks for gas/oil burners in industrial heating systems; ensures compliance with NFPA 86 and EN 298 standards.
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    Key Specs: 120/240V AC input, supports natural gas/light oil, UL/cUL listed, -40°C to +66°C operating temperature, integrated diagnostic LED indicators.
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Part number: Honeywell RM7890B1014/U
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Description

RM7890B1014/U: Product Overview
The RM7890B1014/U is a burner control module designed for industrial combustion systems requiring precise ignition management and fail-safe flame supervision. As part of Honeywell’s RM7890 Series, it serves as the central logic unit for burner management systems (BMS), interfacing with fuel valves, igniters, flame sensors, and safety switches. Its role is to execute pre-programmed sequences (e.g., purge, pilot ignition, main flame establishment) while continuously monitoring for unsafe conditions (e.g., flame loss, fuel pressure deviation).
Functionally, the module processes analog signals (fuel pressure, temperature) and digital inputs (limit switches, emergency stops) to validate safe operating conditions before enabling ignition. It incorporates redundant flame detection (via UV/IR sensors) and fault-tolerant logic to prevent unintended burner activation or delayed shutdowns. The RM7890B1014/U belongs to the RM7890 family, known for compliance with NFPA 86 (Standard for Ovens and Furnaces) and EN 298 (Automatic Burner Control Systems), making it suitable for applications where safety audits and regulatory adherence are critical. By integrating ignition timing, flame monitoring, and safety interlocks into a single unit, it reduces the complexity of distributed control architectures in boilers, furnaces, and kilns.

Honeywell RM7890B1014/U

Honeywell RM7890B1014/U

RM7890B1014/U: Technical Specifications
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    Model Number: RM7890B1014/U
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    Manufacturer: Honeywell
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    Product Type: Burner Control Module
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    Input Voltage: 120/240V AC ±10% (50/60 Hz)
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    Fuel Compatibility: Natural gas (NG), light oil (LO), combination NG/LO
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    Safety Certifications: UL/cUL Listed, FM Approved, EN 298 Compliant
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    Operating Temperature: -40°C to +66°C (-40°F to +151°F)
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    Flame Detection: UV/IR sensor compatibility (supports Honeywell C7027, C7035)
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    Sequence Stages: Purge, pilot trial, main flame trial, run, post-purge
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    Diagnostic Indicators: LED status lights (power, flame, fault, lockout)
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    Dimensions: 127mm x 127mm x 76mm (5.0in x 5.0in x 3.0in)
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    Weight: 0.45kg (1.0lb)
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    Communication: Auxiliary relay outputs (5A @ 240V AC) for external signaling
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    Enclosure Rating: NEMA 1 (indoor use)

    Honeywell RM7890B1014/U

    Honeywell RM7890B1014/U

Core Features & Customer Value​
Redundant Flame Supervision for Uncompromised Safety: The RM7890B1014/U employs dual-mode flame detection (UV and IR) to minimize false trips and missed flames. For engineers, this ensures reliable shutdown during flame loss—critical in chemical plant reactors where unburned fuel accumulation poses explosion risks. The module’s fault-tolerant logic (e.g., 2-out-of-3 voting for flame confirmation) aligns with NFPA 86 requirements, reducing liability during safety audits.
Integrated Sequence Control Simplifies System Architecture: By combining ignition timing, purge duration, and interlock management into one unit, the module eliminates the need for external sequencers or PLC ladder logic. For procurement managers, this cuts component count by 30% and reduces wiring complexity in boiler upgrades. For example, in a food processing oven, the RM7890B1014/U automates the 4-stage purge-ignite-run cycle, ensuring consistent baking temperatures without manual intervention.
Advanced Diagnostics Accelerate Troubleshooting: Built-in LED indicators and auxiliary relay outputs provide real-time status (e.g., “purge active,” “flame failure”). For maintenance teams, this reduces diagnostic time from hours to minutes—critical during unplanned downtime in power plant auxiliary boilers. The module also logs fault codes (e.g., “igniter failure,” “sensor misalignment”), which can be retrieved via Honeywell’s commissioning software for root cause analysis.
Broad Fuel and Environmental Compatibility: Supporting natural gas, light oil, and combination fuels, the RM7890B1014/U adapts to diverse industrial heating systems (e.g., textile dryers, metal heat treat furnaces). Its wide temperature range (-40°C to +66°C) and NEMA 1 enclosure suit both indoor plants and outdoor installations (e.g., remote pipeline heaters). For oil refineries, this means reliable operation in dusty, high-temperature crude heater environments without additional climate control.
Typical Applications​
The RM7890B1014/U is deployed in industrial heating systems where safe, automated burner control is non-negotiable. In a petroleum refinery’s crude distillation unit, it manages the ignition of a 50MBtu/hr natural gas burner, executing a 5-minute purge cycle to remove flammable vapors before lighting the pilot. Its UV/IR flame sensor confirms pilot stability before opening the main gas valve, with redundant logic preventing fuel release if the pilot extinguishes.
In a food processing plant’s industrial oven, the module controls a dual-fuel (natural gas/electric) burner array. During startup, it verifies door interlocks (via digital inputs) and activates the purge fan; if a door is ajar, the lockout relay halts ignition. For maintenance, the LED indicators show “flame sensor dirty” during routine cleaning, avoiding unnecessary burner disassembly.
At a municipal waste-to-energy plant, the RM7890B1014/U operates in a 1200°F waste incinerator burner. Its -40°C cold-start capability ensures reliable ignition during winter outages, while the 240V AC input supports integration with existing plant power infrastructure. The module’s EN 298 compliance satisfies EU emissions regulations, simplifying permitting for the facility.

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