Honeywell Original RM7840L1018 RM7840A1026 RM7840L1075 RM7800L1012 Combustion Safety Controller Oil Burner Stock

1. R7849A1023 (Honeywell 7800 Series – UV Flame Amplifier)

Function: A UV (Ultraviolet) flame signal amplification module designed to interface with RM78XX/EC78XX combustion controllers for flame detection in gas, oil, or combination gas/oil burners.

Core Features

Receives signals from UV detectors (such as C7027, C7035, C7044, etc.) and amplifies them into a standard 0–5 VDC flame signal.

Lacks self-check functionality (Non-Self-Check type), featuring a simple yet robust design.

Flame Failure Response Time (FFRT): Selectable at 2 seconds or 3 seconds (configured via a jumper on the side of the module).

Equipped with a flame signal test jack, allowing for direct voltage measurement to assess flame intensity.

Plug-in card design with a keyed interface; plugs directly into the 7800 series sub-base, requiring no external wiring.

Timing (Flame Detection Only; No Program Sequencing)

Responsible solely for determining the presence or absence of a flame; does not control purge or ignition sequencing. All operational timing is executed by the RM78XX main controller.

Output: 0–5 VDC; a signal of ≥1.25 VDC is interpreted as "flame present."

Operating Environment: -40°C to +60°C.

2. RM7840L1018 (Standard Automatic Type, High/Low-Fire Certified)

Positioning: Fully automatic combustion controller, compatible with single burners utilizing gas, oil, or a gas-oil mixture.

Core Functions:

Automatic sequencing; flame monitoring; 5-segment LED status display

LHL (High/Low-Fire) certified; programmable purge; non-volatile fault memory

Supports connection to external S7800 display module; remote reset capability

Timing: Pilot flame 4/10 seconds; Main flame 10/15 seconds; Post-purge 15 seconds

Electrical: 120 VAC, 50/60 Hz, -40°C to +60°C

3. RM7840A1026 (Automatic Type, Intermittent Pilot)

Positioning: Fully automatic combustion controller featuring an intermittent pilot design, compatible with single burners utilizing gas, oil, or a gas-oil mixture. Core Features:

Automatic ignition, flame monitoring, 5-segment LED status display

Intermittent pilot ignition, 2-stage pilot valve control, flame failure safety lockout

Supports S7800 display and data bus communication

Timing: Pilot 4/10 seconds, Main Flame 10 seconds (intermittent), Post-purge 15 seconds

Electrical: 120VAC, 50/60Hz, -40°C to +60°C

4. RM7840L1075 (Automatic Type, with Valve Proving System - VPS)

Positioning: Fully automatic + Valve Proving System (VPS); suitable for single-burner gas, oil, or combination gas/oil applications.

Core Features:

Includes all functions of the RM7840L1018, with the addition of gas valve leak detection

Supports "Pre-ignition / Post-ignition / Staged" VPS testing (requires S7800 configuration)

5-second early spark termination, optional airflow detection

Timing: Pilot 4/10 seconds, Main Flame 10/15 seconds, Post-purge 15 seconds

Electrical: 120VAC, 50/60Hz, -40°C to +60°C

5. RM7800L1012 (Enhanced Automatic Type, Integrated Display)

Positioning: Fully automatic and integrated; features a built-in S7800 display module; suitable for single-burner gas, oil, or combination gas/oil applications.

Core Features:

Features an integrated 2-line KDM display—no additional module required

Automatic sequencing, flame monitoring, fault history / lockout status storage

LHL (Low-High-Low) firing certification support, optional Modbus communication

Timing: Pilot 4/10 seconds, Main Flame 10/15 seconds, Post-purge 15 seconds

Electrical: 120VAC, 50/60Hz, -40°C to +60°C