Honeywell RM7800L1087 — 7800 Series Relay Module with Valve Proving

The Honeywell RM7800L1087 is a microprocessor-based integrated burner control (flame safeguard relay module) from the proven 7800 SERIES, designed for automatically fired gas, oil, or combination-fuel single-burner applications. It is engineered for UL/CSA Modulating and FM/IRI Modulating burner systems and provides automatic burner sequencing, flame supervision, system status indication, self-diagnostics and troubleshooting in one compact, field-replaceable module.

This model includes the Valve Proving System (VPS) feature, which automatically proves the tightness of the main fuel shut-off valves before or after each burner cycle — helping you meet the highest industrial safety standards with confidence.

Your Benefits at a Glance

• Valve Proving System (VPS) — automatic leak test of main gas valves (MV1/MV2) before, after, split or both cycles; also programmable to "Never"
• Automatic burner sequencing — prepurge, ignition trials, main flame establishing, run, postpurge and safe shutdown
• Flame supervision — compatible with Honeywell C7008A, C7009A, C7915A, C7012E/F, C7061A/F, C7076A/D, C7961E/F flame detectors and R7847 series amplifiers
• Keyboard Display included — S7800A1142 (VFD) keypad/display for setup and diagnostics
• Fault annunciation — 127 fault codes with 6 historical faults for fast troubleshooting
• Field-proven safety — SIL 3 capability (per IEC 61508), built for commercial/industrial applications
• Broad fuel compatibility — gas, oil, or combination fuel, single-burner applications

Key Features

Valve Proving System (VPS) The RM7800L1087 performs automatic seat-tightness tests of the two main fuel shut-off valves. Using the S7800A1142 keyboard display, you can schedule the test: Never (as shipped), Before (with prepurge), After (with postpurge), Both, or Split (MV2 high-pressure seat test before, MV1 low-pressure seat test after).

Automatic Sequence Control The module manages the full burner sequence: Standby → Prepurge → Pilot Flame Establishing Period (PFEP) → Main Flame Establishing Period (MFEP) → Run → Postpurge → Standby, with lockout and interlock monitoring throughout. Pilot flame establishing period is site-configurable (4 s or 10 s), and postpurge time is programmable up to 66 minutes (15 s default).

Integrated Diagnostics A VFD keyboard display (standard with the RM7800) enables complete system status, setup, and diagnostics without additional tools. Historical fault codes accelerate troubleshooting and reduce downtime.

Flexible System Integration The module mounts on a Q7800A/B universal wiring subbase and works with plug-in flame amplifiers and purge timer cards. Optional accessories include a Personal Computer Interface, DATA CONTROLBUS MODULE™, remote display mounting, and Combustion System Manager™ software.

Technical Specifications

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Typical Applications

• Industrial and commercial gas/oil fired boilers and burners
• Process heaters, ovens and furnaces
• Incinerators and thermal oxidizers
• Dual-fuel (gas/oil) single-burner systems
• Burner management system upgrades and retrofits