Relay Module 120V Microprocessor-Based Flame Safeguard for On-Off Burner Applications
The Honeywell RM7890A2015 is a microprocessor-based primary burner control designed for use in automatically fired gas, oil, or combination fuel single-burner systems. This control module provides safe and reliable sequencing, flame monitoring, and system shutdown with built-in diagnostics and prepurge support. As part of the RM7800 Series, it features modular compatibility with Honeywell flame amplifiers and system accessories.
Technical Specifications
- Model: RM7890A2015
- Series: RM7800
- Product Type: Primary Burner Control
- Voltage: 120V AC (+10%, -15%)
- Frequency: 50/60 Hz (±10%)
- Application: On-Off Burner Control
- Pilot Type: Intermittent
- Flame Establishing Period – Pilot: 4 or 10 seconds
- Flame Establishing Period – Main: Intermittent
- PrePurge: Configured via ST7800A Purge Timer Module
- Interlocks: Selectable
- Delayed Main Valve: No
- Airflow Switch Check: Included
- Mounting: Q7800A or Q7800B Universal Subbase Required
- Flame Amplifier Compatibility: R7847, R7848, R7849, R7851, R7852, R7861, R7886
- LED Indicators: Five LEDs for system status and fault annunciation
- Weight: 1 lb 15 oz (0.9 kg)
- Dimensions (with Q7800A): 5″ W x 5″ H x 5-1/4″ D
- Dimensions (with Q7800B): 5″ W x 5″ H x 6-3/32″ D
- Temperature Range (Shipping/Storage): -40°F to +140°F (-40°C to +60°C)
- Vibration Tolerance: 0.5 G
- Condition: New
Key Features
- Provides complete burner sequencing and flame safeguard functionality
- Prepurge operation for enhanced system safety
- Plug-in compatibility with Honeywell flame amplifiers (UV, IR, flame rod)
- Blinking LED status and lockout indicators for simplified troubleshooting
- Nonvolatile memory retains lockout history and runtime status after power loss
- Supports optional remote annunciation, reset, and display modules
- Designed for easy replacement and integration into burner management systems
Compatible Accessories
- Q7800A or Q7800B Subbase
- ST7800A Plug-in Purge Timer Card
- R7847, R7848, R7849, R7851, R7852, R7861, R7886 Flame Amplifiers
- S7800A Keyboard Display Module
- Honeywell flame rods, UV/IR flame detectors
Industry Applications
- Industrial and commercial boilers
- Process heating equipment
- Furnaces and ovens
- Fuel-fired HVAC systems
Installation & Maintenance Notes
- Mount with compatible subbase and purge timer module
- Select appropriate amplifier based on burner type and sensor
- Monitor system operation via onboard LEDs or remote display
- Test flame signal strength during commissioning and routine checks
- Use stored lockout history for preventive maintenance and diagnostics
This part is normally stock.
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