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
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Microprocessor-controlled sequencing for safe burner operation
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Proven-purge logic validates low-fire position before ignition
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ON/OFF control for straightforward burner activation
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Continuous flame supervision for maximum system safety
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Non-volatile memory retains fault data after power loss
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LED indicators for power, pilot, flame, and system status
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Run/Test switch for service, testing, and commissioning
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Modular design compatible with standard Honeywell 7800/7840 subbases
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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:
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Industrial and commercial boiler systems
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Furnaces and process heating systems
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Ovens, dryers, and combustion equipment
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Gas, oil, and dual-fuel burner applications
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Systems requiring low-fire verification before ignition
Benefits
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Enhances burner safety through proven-purge and flame supervision
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Maintains system reliability with stored fault history
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Reduces troubleshooting time using LED indicators and diagnostic memory
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Compatible with modular accessories for easy replacement and upgrades
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Engineered to withstand demanding industrial environments
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