Overview
The Honeywell RM7840M1017 is a microprocessor-based integrated burner control from the Honeywell 7800/7840 Series. Designed for industrial and commercial single-burner applications, this module provides reliable sequencing, flame supervision, diagnostics, and proven-purge logic.
This specific model supports ON/OFF operation with Low-Fire Proven Purge, making it ideal for burners that require safe pre-purge verification and consistent flame management.
Features
Microprocessor-controlled sequencing for safe burner operation
Proven-purge logic validates low-fire position before ignition
ON/OFF control for straightforward burner activation
Continuous flame supervision for maximum system safety
Non-volatile memory retains fault data after power loss
LED indicators for power, pilot, flame, and system status
Run/Test switch for service, testing, and commissioning
Modular design compatible with standard Honeywell 7800/7840 subbases
Suitable for gas, oil, or combination-fired burner systems
Specifications
| Application | Programming Control |
| 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 13 oz |
| Weight (kg) | 0.8 kg |
| Comments | On/Off-LF Proven |
| 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 or Intermittent |
| Interlocks | Running |
| Preignition | Yes |
| PrePurge | Determined by ST7800A Purge Timer Card |
| PostPurge | 15 sec |
| Early Spark Termination | Yes, 5 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 | User selectable |
| Second Stage Pilot Valve | Intermittent |
| Pilot Type | interrupted |
| Vibration | 0.5 G environment |
| Approvals, Control Safety Devices | Acceptable: CSD-1 |
| Approvals, Swiss RE | Acceptable |
| Approvals, Factory Mutual | Report No. OX4A5.AF |
Applications
The RM7840M1017 is ideal for:
Industrial and commercial boiler systems
Furnaces and process heating systems
Ovens, dryers, and combustion equipment
Gas, oil, and dual-fuel burner applications
Systems requiring low-fire verification before ignition
Benefits
Enhances burner safety through proven-purge and flame supervision
Maintains system reliability with stored fault history
Reduces troubleshooting time using LED indicators and diagnostic memory
Compatible with modular accessories for easy replacement and upgrades
Engineered to withstand demanding industrial environments
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