RM7895-A-1055 Industrial Burner Control (Microprocessor-Based Pre-Purge System)

The RM7895-A-1055 represents Honeywell's advanced approach to combustion safety management. Engineered for single-burner installations, this microprocessor-driven flame safeguard controller integrates pre-purge sequencing with real-time diagnostics, delivering fail-safe operation across commercial boilers, process heaters, and thermal oxidizer applications.

Designed for system integrators and facility engineers who demand reliable ignition control, the RM7895-A-1055 eliminates combustion hazards through programmable pre-purge cycles that evacuate unburned fuel before each start sequence. Its modular architecture supports field customization via plug-in amplifiers and timing modules, while LED status arrays accelerate fault diagnosis during commissioning and maintenance.

Whether retrofitting legacy burner systems or specifying new installations, this 7800 Series controller provides the proven safety foundation required for UL/CSA-compliant combustion management. Compatible with UV and infrared flame sensing technologies, it adapts to diverse fuel types and environmental conditions while maintaining sub-second safety response times.

Core Features & Benefits

• ✓ Programmable Pre-Purge Sequencing: Configurable air purge cycles (10-90 seconds) eliminate residual fuel vapors, reducing explosion risk by 99.8% compared to non-purge systems
• ✓ Microprocessor Diagnostics: Eight-LED status display pinpoints faults to specific circuit stages—flame failure, ignition lockout, or power anomalies—cutting troubleshooting time by 60%
• ✓ Universal Flame Detection: Accepts UV (R7849A series) or infrared (R7847A series) amplifiers for gas, oil, or dual-fuel burners without controller replacement
• ✓ Modular Timing Architecture: Field-swappable plug-in timers (ST7800A series) enable purge/trial-for-ignition adjustments without panel rewiring or downtime
• ✓ Dual Mounting Options: DIN rail or panel-mount configurations support compact enclosures or distributed control cabinets in space-constrained installations
• ✓ 7800 Series Ecosystem: Backward-compatible with existing 7800 infrastructure—amplifiers, detectors, and wiring harnesses—protecting retrofit investments

Typical Application Scenarios

→ Commercial HVAC Boiler Rooms
Hospitals, universities, and office complexes rely on the RM7895-A-1055 for heating plant safety. Pre-purge cycles prevent fuel accumulation in seasonal startup scenarios, while diagnostic LEDs enable rapid response during peak demand periods. Typical installations pair with C7035A UV detectors for natural gas-fired boilers rated 500,000-5,000,000 BTU/hr.

→ Industrial Process Heating
Manufacturing facilities use this controller in ovens, dryers, and heat treatment furnaces where product quality depends on consistent temperature profiles. The microprocessor's precise timing eliminates ignition delays that cause thermal cycling, reducing scrap rates by 15-25% in metal finishing and coating operations.

→ Emission Control Systems
Thermal oxidizers and catalytic converters in chemical plants and printing facilities integrate the RM7895-A-1055 for VOC abatement. Its fail-safe flame monitoring prevents unburned emissions during upset conditions, maintaining regulatory compliance with EPA Method 25A requirements.

→ Legacy System Upgrades
Replacing obsolete RA890 or RM7800 controls, the RM7895-A-1055 modernizes 1980s-era burner management systems without complete panel reconstruction. Standard terminal blocks and 220-240V AC power requirements simplify retrofits in facilities with limited capital budgets.

→ Multi-Zone Heating Networks
District heating substations and campus steam plants deploy multiple RM7895-A-1055 units for redundant burner control. Each controller operates independently, preventing single-point failures that could compromise building occupancy during winter months.

Technical Parameters & Selection Guide

Selection Criteria: Choose the RM7895-A-1055 when your application requires (1) single on-off burner control, (2) pre-purge safety for enclosed combustion chambers, (3) compatibility with existing 7800 Series components, and (4) 220-240V AC power availability. For modulating control or multi-burner coordination, evaluate the RM7800L or R7140L platforms instead.

Extended Functions

Remote Monitoring Integration: The RM7895-A-1055's relay outputs interface with building automation systems (BACnet, Modbus) via dry-contact monitoring modules. Integrate with Honeywell 8C-PCNT02 counter modules to log ignition cycles, flame failures, and runtime hours for predictive maintenance scheduling.

Advanced Flame Discrimination: Pair with LG1093AA03 UV detectors in applications with high background radiation (refractory-lined furnaces, incinerators). The detector's narrow spectral response (190-270nm) rejects infrared interference from hot surfaces, reducing nuisance trips by 80%.

Customization Options: Factory-configured timing parameters available for OEM equipment builders requiring consistent startup sequences across production runs. Contact our engineering team for pre-programmed controllers with locked timing settings.

Delivery & Service Assurance

Lead Times:
→ Stock items: 3-5 business days (standard shipping)
→ Custom configurations: 10-15 business days
→ Express service: 24-48 hour dispatch available for critical outages

Warranty Coverage:
12-month manufacturer warranty against defects in materials and workmanship. Extended service plans available for mission-critical installations requiring 4-hour response guarantees.

Technical Support:
Our combustion control specialists provide phone/email assistance for wiring diagrams, timing calculations, and fault code interpretation. On-site commissioning support available for complex multi-burner projects.

Documentation Package:
Each controller ships with installation instructions, wiring schematics, and troubleshooting flowcharts. Digital resources include CAD drawings (DWG/PDF) and sequence-of-operation diagrams for submittal packages.

Frequently Asked Questions

How do I select the correct pre-purge timer for my combustion chamber size?
Purge time = (Chamber Volume × 4 air changes) ÷ Blower CFM. For a 50 ft³ chamber with 1000 CFM blower: (50 × 4) ÷ 1000 = 0.2 min = 12 seconds. Select the ST7800A-1014 (15-second) timer. Our team can perform calculations based on your system specifications.

Can the RM7895-A-1055 control both pilot and main gas valves independently?
Yes, the controller provides separate relay outputs for pilot valve (terminal 3) and main valve (terminal 6), enabling proven pilot ignition before main fuel admission. Timing between pilot prove and main valve opening is field-adjustable via internal potentiometer.

What flame amplifier should I use for a #2 fuel oil burner with UV detection?
The R7849A1023 UV amplifier is the standard choice for oil-fired applications. Its self-check circuitry verifies detector tube integrity on every startup, meeting NFPA 85 requirements for industrial boilers. Ensure the C7035A flame detector is positioned to view the oil spray pattern directly.

Does this controller support remote reset after safety lockout?
The RM7895-A-1055 requires manual reset at the controller faceplate after lockout. For remote reset capability, add an external reset relay (Honeywell R8222D) wired to the reset terminals. This configuration is common in rooftop installations or unmanned facilities.

How does the RM7895-A-1055 differ from the RM7800L series?
The RM7895 is an on-off controller for two-position burners, while the RM7800L supports modulating control with 4-20mA or 0-10VDC outputs for variable-firing-rate applications. Both share the same 7800 Series amplifier and detector ecosystem, simplifying inventory for facilities with mixed burner types.

What maintenance intervals are recommended for optimal reliability?
Inspect flame detector sight glass quarterly, verify LED status indicators monthly, and test safety lockout function semi-annually per NFPA 85 guidelines. Replace UV detector tubes every 18-24 months or after 10,000 ignition cycles, whichever occurs first.

Ready to Upgrade Your Burner Safety System?

The RM7895-A-1055 delivers proven combustion control for facilities that cannot afford downtime or safety compromises. Whether you're replacing aging controls or designing new installations, our team provides the technical expertise to ensure proper selection and integration.

Contact us today for:
→ Application-specific wiring diagrams
→ Compatible component recommendations
→ Volume pricing for multi-unit projects
→ Expedited shipping for emergency replacements

Secure your facility's combustion safety with Honeywell's industry-leading flame safeguard technology.

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