Description
The Honeywell RM7890B-1048 Control is an On/Off primary control designed for atmospheric burners, featuring a shutter drive output, valve proving functionality, and blinking LED fault annunciation. This microprocessor-based burner control is suitable for industrial semi-automatically fired gas, oil, coal, or combination fuel single burner applications, providing advanced safety and functionality beyond conventional controls. It includes intermittent pilot operation and requires components such as the Q7800A or B Universal Wiring Subbases and various flame signal amplifiers (R7847, R7848, R7849, R7851, R7852, R7861, or R7886). This control ensures enhanced reliability and performance in demanding industrial environments.
Technical Specifications
- Model: RM7890B1048
- Series: RM7800
- Voltage: 120V AC (+10%, -15%)
- Frequency: 50/60 Hz
- Application: On-Off Atmospheric Burners
- Pilot Type: Intermittent
- Flame Establishing Period – Pilot: 4 or 10 seconds
- Flame Establishing Period – Main: Intermittent
- PrePurge: Set via ST7800A Plug-in Purge Timer
- Valve Proving System: Included (requires S7800A1142 Display for setup)
- Shutter Drive Output: Yes
- Interlocks: Selectable
- Airflow Switch Check: Included
- Mounting: Requires Q7800A or Q7800B Subbase
- Flame Amplifier Compatibility: R7847, R7848, R7849, R7851, R7852, R7861, R7886
- LED Indicators: 5 status LEDs plus blinking Power LED for lockout fault code
- Memory: Nonvolatile memory retains sequence and lockout history
- Condition: New
Key Features
- Automatic burner sequencing and integrated flame supervision
- Supports shutter drive and valve proving safety checks
- LED annunciation with blinking fault code on lockout
- Interchangeable plug-in amplifiers for UV, IR, or flame rod detection
- Retains operation history and lockout status during power loss
- Optional display and remote communication modules available
- Selectable lockout or relight on flame loss
- Supports local or remote reset and status annunciation
Compatible Accessories
- Q7800A / Q7800B Universal Wiring Subbase
- ST7800A Purge Timer Module
- S7800A1142 Keyboard Display Module
- R7847, R7848, R7849, R7851, R7852, R7861, R7886 Flame Amplifiers
- S7830 Expanded Annunciator
- S7810 ControlBus and Modbus Communication Modules
Industry Applications
- Industrial atmospheric burners
- Large single-fuel burner systems
- Process heating with safety-driven sequencing
- Boiler rooms with valve proving requirements
Installation & Maintenance Notes
- Install using compatible subbase and flame amplifier
- Setup valve proving through S7800A1142 display module
- Use blinking LED codes to identify lockout conditions
- Confirm shutter drive wiring and operational timing
- Test flame signal and interlocks during commissioning
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