HTS KS – Automatic Burner Control Units PFU 760 / PFU 780

Overview

The Honeywell PFU 760 and PFU 780 are microcontroller-based automatic burner control units designed for controlling, igniting, and monitoring gas burners in continuous or intermittent operation. The PFU 760 serves directly ignited burners of unlimited capacity, while the PFU 780 extends that capability to pilot and main burner configurations where both burners can be monitored independently.

Both units support impulse-controlled, modulating, or stage-controlled gas burners and offer flame supervision via ionization, UV sensors (UVS for intermittent operation), or UV sensor UVD 1 (for continuous UV operation). Program status, unit parameters, and flame signal are displayed on an integrated 2-digit 7-segment display, with parameter diagnosis and adjustment available via optical interface using BCSoft software.

Features & Benefits

• 2-digit 7-segment display shows program status, unit parameters, and flame signal — simplifies commissioning and fault diagnosis on site
• Diagnosis and parameter adjustment via optical interface using BCSoft software — enables non-intrusive configuration without opening the unit
• Manual mode and air valve control via optical interface — supports safe commissioning and maintenance procedures
• Adjustable start-up safety time: 3, 5, or 10 seconds — configurable to match burner and process requirements
• Adjustable safety time during operation: 1 or 2 seconds
• Configurable start-up attempts (1–4) and restart attempts (up to 3) — reduces nuisance shutdowns while maintaining safety compliance
• Flame supervision via ionization, UV (UVS), or UV (UVD 1) sensor — flexible flame detection for a wide range of burner types
• Flame proving period adjustable 0–25 seconds
• Minimum burner pause time adjustable 0–250 seconds
• PROFIBUS DP fieldbus interface available via PFA 700 adapter — integrates into plant-level automation and monitoring systems
• Integrated air valve control (PFU..L variant) — enables direct combustion air management without additional hardware
• Available for grounded or ungrounded mains — supports a wide range of electrical installation environments
• SIL 3 rated per EN 61508, Parts 1–7 — meets the highest functional safety requirements for burner management applications

Technical Specifications

• Mains voltage: PFU..N — 110/120 V AC; PFU..T — 220/240 V AC
• Power consumption: 8 VA + ignition transformer load
• Sensor voltage: ~230 V AC
• Output current: Max. 2 A per output; total max. 2.5 A
• Operating temperature range: -20 to +60°C (-4 to +140°F); no condensation
• Enclosure rating: IP00 (IP20 when installed in module subrack)
• Altitude limit: <2,000 m AMSL
• Dimensions: 133.4 mm H x 40.6 mm W
• Start-up safety time: Adjustable — 3, 5, or 10 seconds
• Safety time during operation: 1 or 2 seconds
• Flame proving period: 0–25 seconds
• Minimum burner pause time: 0–250 seconds
• Start-up attempts: 1–4 (configurable)
• Restart attempts: Up to 3 (configurable)
• Maximum sensor cable length: 100 m
• Display: 2-digit 7-segment (program status and flame signal)
• Software interface: BCSoft via optical interface
• Fieldbus: PROFIBUS DP via PFA 700
• Approvals: SIL 3 (EN 61508), EN 298:2012, FM (PFU..T variant), NFPA 86, AGA, UKCA, Eurasian Customs Union (EAC)

Applications

• Directly ignited gas burners of unlimited capacity (PFU 760)
• Pilot and main burner systems with independent flame monitoring for each burner (PFU 780)
• Impulse-controlled, modulating, or stage-controlled gas burner systems
• Continuous operation with ionization flame control
• Continuous operation with UV flame control using UVD 1 sensor
• Intermittent operation with UV flame control using UVS sensors
• Industrial combustion systems requiring SIL 3 functional safety compliance
• Applications requiring PROFIBUS DP integration via PFA 700
• High-temperature process burner applications (high-temp variant)

Models / Configurations

• PFU 760 – Automatic burner control unit for directly ignited burners of unlimited capacity; intermittent or continuous operation with ionization or UV flame supervision
• PFU 780 – Automatic burner control unit for pilot and main burner systems; both burners monitored independently; intermittent or continuous operation with ionization or UV flame supervision
• PFU..N variant – Mains voltage 110/120 V AC
• PFU..T variant – Mains voltage 220/240 V AC; FM Approved
• PFU..L variant – Includes integrated air valve control
• PFU 778 – For directly ignited burners of unlimited capacity (high-capacity variant)
• PFU 798 – For pilot and main burners of unlimited capacity with independent monitoring of both burners

PFU 760 / PFU 780 Accessories

• PFA 700 – PROFIBUS DP fieldbus adapter; enables PFU 7xx integration into PROFIBUS DP plant communication networks
• PCO 200 – Parameter setting and display module; provides local parameter adjustment and diagnostic readout for PFU units
• PCO 300 – Advanced parameter setting and display module with extended diagnostic capability
• BCSoft V 3.9.0 – PC software for parameter diagnosis, adjustment, and manual mode control via the PFU optical interface
• UVS UV sensors – UV flame sensors for intermittent operation UV flame supervision with PFU 7xx units
• UVD 1 – UV sensor for continuous operation UV flame supervision with PFU 7xx units

Documentation