RM7897C1000 | Honeywell 7800 Series Burner Control Module with Programmable Post-Purge 120 VAC

Honeywell · PLCs & Industrial Controllers

Description  The Honeywell RM7897C1000 is a microprocessor-based primary burner control module designed for automatically fired single-burner applications using gas, oil, or combination fuels. Operating on 120 VAC, 50/60 Hz, it provides complete control sequencing, flame supervision, diagnostics, and safety shutdown. The module supports programmable post-purge timing, delayed main valve operation, and selectable pilot type for flexible system configurations.     Technical Specifications  Condition New/Never Used Surplus Brand Honeywell Category HVAC Part Number RM7897C1000 Subcategory Burner Control Series 7800 Series Product Type Microprocessor Relay Module Voltage 120 VAC ± 10 %, 50/60 Hz Application On-Off Primary Control with Pre- and Post-Purge Flame Establishing Period 4 s or 10 s (selectable) Main Flame Establishing Period 10 s / 15 s typical (based on configuration) Pilot Type Selectable (interrupted / intermittent) Pre-Purge Determined by ST7800A Purge Timer Card Post-Purge Programmable using S7800A1142 KDM Delayed Main Valve Yes Interlocks Selectable airflow and safety interlocks Memory Nonvolatile; retains fault and history logs Diagnostic Interface Local/remote annunciation, optional Modbus or Data ControlBus™ LED Indicators 5 LEDs (Power, Sequence, Fault, Flame, Lockout) Run/Test Switch 5-position for setup and commissioning Flame Amplifier Compatibility Plug-in amplifiers (rectification, UV, IR types) Operating Temperature –40 °F to +140 °F (–40 °C to +60 °C) Vibration Rating 0.5 G environment Enclosure Type Enclosed, dust-protected relay module Dimensions (L × W × H) 7.25 in × 7.0 in × 5.5 in (approx.) Weight 2.67 lb (1.21 kg) Compliance UL Listed, CSA Certified, CE Compliant Information About RM7897C1000 The RM7897C1000 belongs to Honeywell’s 7800 Series of relay modules, engineered for full-function primary burner management. It coordinates the pre-purge, ignition, flame establishing, main flame proving, and post-purge stages, ensuring safe burner operation. This model features a delayed main valve and a programmable post-purge function, configurable using the S7800A1142 Keyboard Display Module (KDM). Equipped with a nonvolatile memory, the RM7897C1000 stores event history and lockout information for post-failure analysis. It also offers fault annunciation through five sequence LEDs and a blinking fault indicator, while interchangeable plug-in amplifiers allow flexibility with various Honeywell flame detectors. Key Features: Automatic Burner Sequencing: Manages pre-purge, pilot ignition, main flame proving, and shutdown cycles automatically. Programmable Post-Purge: Post-purge timing adjustable using the S7800A1142 KDM for optimal heat-exchanger cooling and safety. Delayed Main Valve Feature: Adds a controlled delay between pilot and main valve opening to ensure stable ignition. Selectable Flame Establishing Period: Configurable 4-second or 10-second pilot flame establishment to match system requirements. Advanced Diagnostics: Integrated system and self-diagnostics with LED fault codes simplify troubleshooting and maintenance. Interchangeable Plug-In Amplifiers: Compatible with multiple Honeywell flame sensors (UV, IR, or rectification) for detection flexibility. LED Status Indicators: Five LEDs provide visual feedback for sequence steps, system power, and fault conditions. Nonvolatile Memory: Retains operational history and lockout data after power loss for reliable maintenance records. Flexible Interlock Options: Selectable interlock supervision for airflow, fuel valves, and ignition safety. Optional Communication Interface: Supports PC connection, Modbus integration, and Data ControlBus™ for advanced monitoring. The RM7897C1000 delivers the control precision, safety integrity, and configuration flexibility essential for industrial and commercial combustion systems.

Brand: Honeywell · Category: PLCs & Industrial Controllers

Key features

• Automatic Burner Sequencing: Manages pre-purge, pilot ignition, main flame proving, and shutdown cycles automatically.
• Programmable Post-Purge: Post-purge timing adjustable using the S7800A1142 KDM for optimal heat-exchanger cooling and safety.
• Delayed Main Valve Feature: Adds a controlled delay between pilot and main valve opening to ensure stable ignition.
• Selectable Flame Establishing Period: Configurable 4-second or 10-second pilot flame establishment to match system requirements.
• Advanced Diagnostics: Integrated system and self-diagnostics with LED fault codes simplify troubleshooting and maintenance.
• Interchangeable Plug-In Amplifiers: Compatible with multiple Honeywell flame sensors (UV, IR, or rectification) for detection flexibility.
• LED Status Indicators: Five LEDs provide visual feedback for sequence steps, system power, and fault conditions.
• Nonvolatile Memory: Retains operational history and lockout data after power loss for reliable maintenance records.
• Flexible Interlock Options: Selectable interlock supervision for airflow, fuel valves, and ignition safety.
• Optional Communication Interface: Supports PC connection, Modbus integration, and Data ControlBus™ for advanced monitoring.

Specifications

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