Description
RM7890B1048 On-Off Primary Control
Shutter Drive Output, Valve Proving, Intermittent Pilot, 120 Vac, Blinking LED Fault Annunciation
The RM7890B1048 is a microprocessor-based On-Off primary control designed for industrial semi-automatically fired single burner applications using gas, oil, coal, or combination fuels. It features shutter drive output, valve proving capability, and advanced diagnostics through blinking LED fault codes, ensuring high safety and performance in demanding combustion systems.
Key Features
-
Integrated valve proving feature; setup via S7800A1142 Keyboard Display (not included)
-
Shutter drive output supports air damper control and pre-combustion airflow sequencing
-
Blinking LED for power status and lockout fault code display
-
Nonvolatile memory retains fault history and sequencing data on power loss
-
Compatible with interchangeable plug-in flame amplifiers for UV, IR, or rectification sensing
-
Optional PC communication, remote annunciation, and reset functionality
-
Five diagnostic LEDs for real-time status updates
-
Selectable recycle or lockout on flame failure
-
Modular design allows easy integration with 7800 Series accessories and components
Technical Specifications
| Specification | Value |
|---|---|
| Application | On-Off Primary Control with VPS |
| Voltage | 120 Vac |
| Pilot Type | Intermittent |
| Shutter Drive Output | Yes |
| Valve Proving | Yes (S7800A1142 required for setup) |
| Flame Failure Response | Recycle or Lockout (selectable) |
| Memory | Nonvolatile |
| Diagnostic Display | 5 LEDs + blinking Power LED for faults |
| Reset Options | Local or Remote (optional) |
Required Components
-
Wiring Subbase: Q7800A or Q7800B
-
Flame Amplifier: R7847, R7848, R7849, R7851, R7852, R7861, or R7886
Common Applications
-
Industrial gas and oil burners requiring shutter control
-
Systems requiring valve integrity testing
-
Installations needing real-time fault diagnostics and historical tracking
-
Applications integrating with combustion system manager software
