Overview
The RM7896D1027 is a microprocessor-based Honeywell burner control designed for automatically fired gas, oil, or combination-fuel single-burner systems. It provides pre-purge and post-purge sequences, interrupted-pilot ignition, dynamic airflow-switch testing, and full system diagnostics for maximum safety and reliability.
Features
ON/OFF primary burner sequencing with automatic flame supervision
Pre-purge and 60-second post-purge
Interrupted pilot ignition
Pilot flame establishing period selectable between 4 seconds or 10 seconds
Main flame establishing time of 10 seconds
Dynamic Airflow Switch (AFS) check
Self-diagnostics with 5-LED status and sequence indicators
Non-volatile memory retains fault history after power loss
Lockout safety logic with detailed fault codes
Wide environmental operating range for harsh industrial sites
Accepts standard 7800 Series sub-bases and accessories
Specifications
| Application | On-Off Primary Control with Pre and Post purge |
| Dimensions (in.) | 5 in. wide x 5 in. high x 5 1/4 in. deep with Q7800A Subbase x 6 3/32 in. deep with Q7800B Subbase |
| Dimensions (mm) | 127 mm wide x 127 mm high x 133 mm deep with Q7800A Subbase x 155 mm deep with Q7800B Subbase |
| Weight (lb) | 1 lb 15 oz |
| Weight (kg) | 0.9 kg |
| Comments | Blinking Fault code LED, early spark termination when flame sensed, pre and post purge |
| Frequency | 50 Hz; 60 Hz (±10%) |
| Approvals, Underwriters Laboratories Inc. | Component Recognized, File No. MP268; Guide No. MCCZ. |
| Approvals, Canadian Standards Association | Certified, File No. LR95329-3. |
| Voltage | 120 Vac (+10, -15%) |
| Shipping and Storage Temperature Range (F) | -40 F to +140 F |
| Shipping and Storage Temperature Range (C) | -40 C to +60 C |
| Approvals, Federal Communications Commission | FCC Part 15, Class B, Emissions. |
| Flame Establishing Period – Pilot | 4 sec or 10 sec |
| Flame Establishing Period – Main | 10 sec |
| Interlocks | Selectable |
| PrePurge | Determined by ST7800A Purge Timer Card |
| PostPurge | 60 sec |
| Required Components | Q7800A,B Universal Wiring Subbases. R7847, R7848, R7849, R7851, R7852, R7861, or R7886 Flame Signal Amplifier. ST7800A Plug-in Purge Timer Card. |
| AirFlow Check | Dynamic |
| Delayed Main Valve | Yes |
| Pilot Type | interrupted |
| Vibration | 0.5 G environment |
| Approvals, Swiss RE | Acceptable |
| Approvals, Factory Mutual | Report No. OX4A5.AF. |
Applications
Commercial and industrial single-burner systems
Gas, oil, and combination-fuel burners
Systems requiring thorough purge cycles and reliable flame supervision
Replacement and retrofit upgrades in existing Honeywell 7800 Series setups
Facilities needing advanced diagnostics and safety lockout capability
Benefits
Improves safety with integrated pre/post purge sequences
Fast troubleshooting via LED status display and stored fault history
Withstands rugged industrial temperature ranges
Flexible configuration supports a wide range of burner applications
Modular design for quick maintenance and replacement
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