RM7890A1015 Honeywell On-Off Primary Burner Control

Honeywell RM7890A1015 On-Off Primary Control

Microprocessor-based integrated primary burner control for automatically fired gas, oil or combination fuel single burner applications. Provides level of safety, functional capability and features beyond conventional controls.

Features

• Functions include automatic burner sequencing, flame supervision, system status indication, system or self diagnostics and troubleshooting.
• Subbase and amplifier are required for operation.
• Options include PC interface, keyboard display module, DATA CONTROLBUS™ MODULE, remote display module, first-out expanded annunciator, and COMBUSTION SYSTEM MANAGER™ software.
• Five LEDs provide sequence information.
• Interchangeable plug-in flame amplifiers.
• Optional local or remote annunciation of operation and fault information.
• Nonvolatile memory retains history files and sequencing status after power loss.
• Optional remote reset capability.
• Optional report generation.
• Selectable relight or lockout on loss of flame.

The RM7890A1015 is a model of an On-Off Primary Burner Control from Honeywell. The RM7890 series of primary burner controls are designed for automatic startup and shutdown of single or multiple burner combustion equipment used in commercial and industrial applications. These controls offer safety, functional capabilities, and reliability for properly operating burner systems.

Here are some key features and points related to the RM7890A1015 and similar Honeywell On-Off Primary Burner Controls:

Microprocessor-based: These controls utilize modern microprocessor technology to ensure accurate and reliable operation.

Safety: One of the primary functions of the RM7890 is to ensure safe ignition and operation of burners. If the control detects any anomalies or unsafe conditions, it can shut down the burner to prevent unsafe operation.

Sequence Control: The RM7890 controls the sequence in which various components of a burner system operate, such as igniters, main burners, and blower motors. This ensures an orderly and safe startup and shutdown of the burner.

Diagnostics: Many of these controls come equipped with diagnostic LEDs that give operators immediate feedback about the control's status and any faults that might occur. This makes troubleshooting and maintenance easier.

Compatibility: The RM7890 series is designed to be compatible with a range of Honeywell flame detectors and amplifiers, ensuring proper flame detection and amplification.

Interlocks: These controls also offer various interlock inputs for integrating with other safety devices and systems, ensuring comprehensive protection.

Lockout and Timing: In case of a flame failure or other fault conditions, the RM7890 will go into a lockout mode, requiring a manual reset. Additionally, the control provides specific timings for ignition, trial for ignition, and other sequence steps to ensure safe burner operation.

Remote Reset Capability: Some models allow for remote reset, meaning if the control goes into lockout due to a fault, it can be reset remotely, enhancing operational convenience.

If you're looking to install, maintain, or troubleshoot an RM7890A1015 or any similar model, always refer to Honeywell's official technical documentation and manuals. This ensures you have accurate and up-to-date information on installation procedures, specifications, and safety guidelines.

Here's the optimized description for the RM7890A1015:

Suggested Description

The Honeywell RM7890A1015 is a microprocessor-based on-off primary burner control for automatically fired gas, oil, or combination fuel single burner applications. Part of Honeywell's 7800 Series, it delivers automatic burner sequencing, flame supervision, and comprehensive self-diagnostics for commercial and industrial combustion systems. It supersedes the RM7890A1007.

This is a complete primary burner control — unlike the RM7823A flame relay, the RM7890A handles safe-start checks, safety lockout, and load switching directly, making it the core controller for a flame safeguard system. A compatible wiring subbase and flame signal amplifier are required; the display module is sold separately.

Key Features

• On-off primary control — full automatic burner sequencing including safe-start check, safety lockout, and load switching
• Intermittent pilot — pilot established at startup and shut off once main flame is proven
• Selectable pilot flame establishing period — 4-second or 10-second PFEP
• Intermittent main flame establishing period
• Selectable relight or lockout on loss of flame — configurable behavior via site jumper
• Five status LEDs — indicate Power, Pilot, Flame, Main, and Alarm states; Power LED blinks fault codes on safety shutdown
• Interchangeable plug-in flame amplifiers — supports UV, IR, and rectification detection
• Nonvolatile memory — retains history files and lockout status through power loss
• Optional remote reset capability
• Lockout and running interlocks
• Modbus interface option — supports PC interface, Data ControlBus™ Module, and Combustion System Manager™ software

Specifications

Required & Compatible Components

• Wiring Subbase: Q7800A or Q7800B Universal Wiring Subbase (required)
• Flame Signal Amplifier: R7847, R7848, R7849, R7851, R7852, R7861, or R7886 (required)
• Display (optional): S7800A1142 Keyboard Display Module — enables programmable postpurge and on-board fault history
• Optional add-ons: Modbus interface, Data ControlBus™ Module, remote display module, first-out expanded annunciator, Combustion System Manager™ software

Common Applications

The RM7890A1015 is widely used as the primary burner control in commercial boilers, industrial heating systems, process burners, and other single-burner combustion equipment requiring automatic startup, flame supervision, and safety lockout. It is suitable wherever an on-off firing mode with intermittent pilot is required and a proven primary control is needed to meet flame safeguard system requirements.

Important Notes

• Subbase and amplifier are required and are not included — this unit does not operate standalone
• The Keyboard Display Module (S7800A1142) is not included but is recommended for programmable postpurge and diagnostics access
• Not weather-tight — install in an approved enclosure when used outdoors
• Site-configurable jumpers allow adjustment of pilot FEP, relight/lockout behavior, and other parameters at commissioning