Honeywell RM7897C2000 Relay Module Burner Control with Grounding Pin

120V Integrated Primary Control with Post-Purge and Optional Communication Features

The Honeywell RM7897C2000 is a microprocessor-based primary burner control designed for automatically fired gas, oil, or combination fuel burners. This model offers comprehensive sequencing, flame supervision, safety shutdown, and post-purge functionality. Engineered for flexibility, it supports intermittent pilot operation, integrates with standard Honeywell subbases and flame amplifiers, and can be expanded with optional display, communication, and annunciation modules.

Technical Specifications

• Model: RM7897C2000
• Series: RM7800
• Voltage: 120V AC (+10%, -15%)
• Frequency: 50/60 Hz
• Application: On-Off Burner Control
• Pilot Type: Intermittent
• Flame Establishing Period – Pilot: 4 or 10 seconds
• Flame Establishing Period – Main: Intermittent
• PostPurge: Included (timed based on system configuration)
• Interlocks: Selectable
• Airflow Switch Check: Supported
• Mounting: Requires Q7800A or Q7800B Universal Subbase
• Flame Amplifier Compatibility: R7847, R7848, R7849, R7851, R7852, R7861, R7886
• LED Indicators: 5 LEDs for status, sequence, and fault indication
• Memory: Nonvolatile memory retains cycle history, lockouts, and flame signal
• Condition: New

Key Features

• Provides complete burner sequencing and flame safeguard functionality
• Supports intermittent pilot and post-purge for increased safety
• LED indicators display real-time burner status and fault codes
• Optional modules for remote annunciation, reset, and data communication
• Plug-in flame amplifiers allow flexible flame detection options
• Nonvolatile memory saves lockout and operational history for diagnostics
• Compatible with Honeywell’s combustion system architecture

Compatible Accessories

• Q7800A / Q7800B Subbases
• ST7800A Purge Timer Module
• R7847, R7848, R7849, R7851, R7852, R7861, R7886 Flame Amplifiers
• S7800A Keyboard Display Module
• S7830 Expanded Annunciator
• S7810 ControlBus or Modbus Communication Modules

Industry Applications

• Industrial and commercial boiler systems
• Gas and oil-fired burners
• Process heating systems
• Combustion applications requiring reliable sequencing and post-purge

Installation & Maintenance Notes

• Mount securely using a compatible subbase and amplifier
• Confirm post-purge timing and interlock functions during commissioning
• Use LEDs or display module to monitor burner cycle and troubleshoot faults
• Periodically verify flame signal strength and inspect safety interlocks
• Review memory-stored lockout and runtime data during regular service