Technical Overview
The Honeywell RM7850A1001 is a microprocessor-based integrated burner control for automatically fired gas, oil, or combination fuel single-burner systems . This relay module delivers automatic burner sequencing alongside comprehensive flame supervision for full modulation applications . It forms part of the 7800 SERIES and requires a Q7800 wiring subbase, an R78XX amplifier, and an ST7800 purge card for complete operation . A non-volatile memory retains fault history and lockout status even after a total power loss . The unit allows external electrical voltage checks, thereby simplifying troubleshooting during maintenance .
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model Number | RM7850A1001 |
| Product Type | Relay Module / Programming Control |
| Voltage | 120 Vac (+10/-15%) |
| Frequency | 50/60 Hz (±10%) |
| Power Dissipation | 10W maximum |
| Maximum Connected Load | 2000 VA |
| Fuse Rating | 15A maximum, Fast Blow, type SC |
| Operating Temperature | -40°F to +140°F (-40°C to +60°C) |
| Storage Temperature | -40°F to +150°F (-40°C to +66°C) |
| Humidity Rating | 85% RH continuous, noncondensing |
| Vibration | 0.5G environment |
| Post-Purge Time | 2 seconds (user selectable) |
| Pilot Flame Establishing Period | 3 sec or 5 sec |
| Main Flame Establishing Period | 3 sec, 5 sec, or intermittent |
| Dimensions (with Q7800A Subbase) | 127 mm wide x 127 mm high x 133 mm deep |
| Dimensions (with Q7800B Subbase) | 127 mm wide x 127 mm high x 155 mm deep |
| Weight | 0.7 kg (approx. 1 lb 10 oz) |
| Mounting Type | Panel mount with Q7800 subbase |
| Required Components | Q7800A/B subbase, R78XX amplifier, ST7800 purge timer |
| Approvals | FM Approved, CE (EN298), UL, CSA |
| Country of Origin | USA |
Key Features
Full Modulation Support – This module specifically handles modulating burners with High Fire and Low Fire Proving logic for precise fuel control .
Advanced Diagnostics – The built-in self-diagnostics and troubleshooting functions help operators identify issues quickly .
Visual Status Indication – Five LEDs provide sequence information, and a five-function Run/Test Switch allows manual control .
Non-Volatile Memory – The module retains history files and lockout status after power loss, ensuring data persistence .
Interchangeable Amplifiers – Plug-in amplifiers simplify field replacement and customization .
Compatible Detectors – The unit works with existing Honeywell flame detectors, reducing upgrade complexity .
Applications
The Honeywell RM7850A1001 excels in industrial burner management, including boilers, furnaces, and process heaters. It delivers reliable performance in power generation, chemical processing, and manufacturing environments where precise flame supervision is critical.
Details
| Weight | 0.2 kg |
|---|---|
| Dimensions | 85 × 65 × 30 mm |
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