Microprocessor-Based 120V Flame Safeguard for On-Off Burners
The Honeywell RM7890B2030 is a primary burner control designed for single-burner applications firing gas, oil, or combination fuels. This microprocessor-based module offers dependable burner sequencing, flame supervision, and safety shutdown functions. It supports standard prepurge operation and integrates seamlessly with Honeywell’s RM7800 series subbases and flame amplifiers.
Technical Specifications
- Model: RM7890B2030
- Series: RM7800
- Product Type: Primary Burner Control
- Power Supply: 120V AC (+10%, -15%), 50/60 Hz
- Application: On-Off Single Burner Control
- Flame Establishing Period – Pilot: 4 or 10 seconds
- Flame Establishing Period – Main: Intermittent
- Interlocks: Selectable
- PrePurge: Determined by ST7800A Purge Timer Card
- Delayed Main Valve: No
- Pilot Type: Intermittent
- Airflow Switch Check: Included
- Mounting: Requires Q7800A or Q7800B Subbase
- Flame Amplifier Compatibility: R7847, R7848, R7849, R7851, R7852, R7861, R7886
- Certifications:
- UL Recognized – File No. MP268
- CSA Certified – File No. LR95329-3
- FCC Part 15, Class B Emissions
- 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
- Shipping & Storage Temperature Range: -40°F to +140°F (-40°C to +60°C)
- Condition: New
Key Features
- Microprocessor-controlled sequencing and diagnostics
- Compatible with all standard Honeywell plug-in flame amplifiers
- Optional keyboard display, remote annunciation, and reset
- Nonvolatile memory retains history and status after power loss
- Five onboard LEDs display sequence and lockout information
- Suitable for gas, oil, or combination-fuel systems
Compatible Accessories
- Q7800A or Q7800B Subbase
- ST7800A Purge Timer Card
- R7847, R7848, R7849, R7851, R7861, R7886 Flame Amplifiers
- S7800A Keyboard Display Module
- Flame rods, UV and IR flame detectors
Industry Applications
- Commercial and industrial burners
- Process heating systems
- Steam and hot water boilers
- Fuel-fired HVAC and manufacturing systems
Installation & Maintenance Notes
- Install with correct subbase and verify flame amplifier compatibility
- Set purge timing using ST7800A card
- Monitor status with built-in LEDs or optional display
- Test flame signal strength during startup
- Review stored lockout and history data during service