RM7890A1056 | Honeywell 7800 Series On-Off Primary Burner Control 120 VAC 4/10 Sec Pilot
Honeywell · HVAC & Building Controls
Description The Honeywell RM7890A1056 is a microprocessor-based primary burner control for automatically fired gas, oil, or combination-fuel single-burner systems. Operating on 120 VAC, it provides automatic sequencing, flame supervision, system diagnostics, and safety interlocks for reliable on-off burner operation with 4 or 10-second pilot flame establishing periods. Technical Specifications Condition New/Never Used Surplus Brand Honeywell Category HVAC Part Number RM7890A1056 Subcategory Burner Control Series 7800 Series Control Type On–Off Primary Burner Control Pilot Flame Establishing Period 4 or 10 seconds (selectable) Main Flame Establishing Period Intermittent Power Supply 120 VAC (+10 / –15 %), 50/60 Hz (±10 %) Power Dissipation 10 W maximum Total Connected Load 2000 VA max Fuse Rating 15 A (max), fast-blow type SC or equivalent Ambient Operating Temperature –40 °F to +140 °F (–40 °C to +60 °C) Storage Temperature –40 °F to +150 °F (–40 °C to +66 °C) Relative Humidity 85 % (non-condensing) Vibration Rating 0.5 G Safety Integrity Level SIL 3 capable Required Components Subbase & flame amplifier (ordered separately) Communication Options Keyboard Display Module, DATA CONTROLBUS™, PC interface Indicator LEDs 5 status and sequence LEDs Enclosure Molded plastic, panel-mount module Application Gas, oil, or combination-fuel burner systems Weight 2.75 lbs Information About RM7890A1056 The RM7890A1056 is part of Honeywell’s 7800 Series of advanced relay modules designed for safe and efficient control of industrial and commercial burners. This model supports intermittent pilot operation and integrates safety monitoring, system diagnostics, and event logging for improved reliability and troubleshooting. It requires a compatible subbase and plug-in flame amplifier to operate, with options for local or remote annunciation via keyboard display modules or the DATA CONTROLBUS™ system. The RM7890A1056 uses nonvolatile memory to retain system history and status through power interruptions and is SIL 3 capable when installed in a properly designed safety instrumented system. Key Features: Microprocessor-Based Control: Provides precise sequencing and flame supervision for gas, oil, or dual-fuel burners. Intermittent Pilot Operation: Supports 4 or 10-second pilot flame establishing periods with continuous main flame monitoring. Integrated Self-Diagnostics: Continuously checks system integrity and displays fault codes for faster troubleshooting. Nonvolatile Memory: Retains operating history, fault data, and last sequence position after power loss. Multiple Communication Options: Compatible with remote annunciators, keyboard display modules, and PC interfaces. LED Status Indicators: Five front-panel LEDs provide visual sequence, operation, and fault information. Interchangeable Flame Amplifiers: Accepts plug-in UV, rectification, or infrared amplifiers for application flexibility. Remote Reset and Reporting: Optional external reset capability and event report generation enhance field usability. SIL 3 Capable: Meets IEC 61508 requirements when used in a certified safety system for critical combustion control. Wide Operating Range: Functions in temperatures from –40 °F to +140 °F (–40 °C to +60 °C) and 85 % RH non-condensing. The RM7890A1056 delivers the safety, reliability, and control precision required for modern combustion management systems.
Brand: Honeywell · Category: HVAC & Building Controls
Key features
- Microprocessor-Based Control: Provides precise sequencing and flame supervision for gas, oil, or dual-fuel burners.
- Intermittent Pilot Operation: Supports 4 or 10-second pilot flame establishing periods with continuous main flame monitoring.
- Integrated Self-Diagnostics: Continuously checks system integrity and displays fault codes for faster troubleshooting.
- Nonvolatile Memory: Retains operating history, fault data, and last sequence position after power loss.
- Multiple Communication Options: Compatible with remote annunciators, keyboard display modules, and PC interfaces.
- LED Status Indicators: Five front-panel LEDs provide visual sequence, operation, and fault information.
- Interchangeable Flame Amplifiers: Accepts plug-in UV, rectification, or infrared amplifiers for application flexibility.
- Remote Reset and Reporting: Optional external reset capability and event report generation enhance field usability.
- SIL 3 Capable: Meets IEC 61508 requirements when used in a certified safety system for critical combustion control.
- Wide Operating Range: Functions in temperatures from –40 °F to +140 °F (–40 °C to +60 °C) and 85 % RH non-condensing.
Specifications
| Manufacturer part number | RM7890A1056 |
|---|---|
| Condition | New/Never Used Surplus |
| Brand | Honeywell |
| Category | HVAC |
| Part Number | RM7890A1056 |
| Subcategory | Burner Control |
| Series | 7800 Series |
| Control Type | On–Off Primary Burner Control |
| Pilot Flame Establishing Period | 4 or 10 seconds (selectable) |
| Main Flame Establishing Period | Intermittent |
| Power Supply | 120 VAC (+10 / –15 %), 50/60 Hz (±10 %) |
| Power Dissipation | 10 W maximum |
| Total Connected Load | 2000 VA max |
| Fuse Rating | 15 A (max), fast-blow type SC or equivalent |
| Ambient Operating Temperature | –40 °F to +140 °F (–40 °C to +60 °C) |
| Storage Temperature | –40 °F to +150 °F (–40 °C to +66 °C) |
| Relative Humidity | 85 % (non-condensing) |
| Vibration Rating | 0.5 G |
| Safety Integrity Level | SIL 3 capable |
| Required Components | Subbase & flame amplifier (ordered separately) |
| Communication Options | Keyboard Display Module, DATA CONTROLBUS™, PC interface |
| Indicator LEDs | 5 status and sequence LEDs |
| Enclosure | Molded plastic, panel-mount module |
| Application | Gas, oil, or combination-fuel burner systems |
| Weight | 2.75 lbs |
| Product type | Burner Control |
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