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Combustion 911
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an Olsträd Engineering Company

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Burner Control Unit PFU 780

PF-19 Burner Control PFU 780 LND 10/2

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  • For pilot and main burners of unlimited capacity in intermittent operation or in continuous operation pursuant to EN 746-2
  • Plug-in function unit for mounting in 19″ module subracks
  • Separate flame control for pilot burner and main burner by UV, ionization or a further option of using the furnace chamber temperature
  • Programming and diagnostic software BCSoft simplifies logistics management
  • Display of the program status, unit parameters, and flame signal; manual mode for burner adjustment and for diagnostic purposes
  • Air valve control relieves the furnace control
  • FM approved

Accessories

Model and Description Price Cart
PCO 200
Optical Adapter for BC Soft with USB interface, includes CD-ROM

Applications

Click on images for close-up view.

Application for PFU 780 Burner Control Unit Stage-controlled main burner with alternating pilot burner

Control: Main burner ON/OFF.

The main burner can be started with reduced capacity after the operating signal from the pilot burner has been detected. The pilot burner is switched off automatically after the main burner has started up. When the main burner is switched off, the pilot burner automatically switches on again.

A UV sensor monitors the flame signal from pilot and main burners. UV sensor UVD 1 is used for continuous operation, UV sensor UVS for intermittent operation.
Application for PFU 780 Burner Control Unit Stage-controlled main burner with permanent pilot burner

Control: Main burner ON/OFF.

The main burner can be started with reduced capacity after the operating signal from the pilot burner has been detected. Pilot and main burners can be operated simultaneously.
Application for PFU 780 Burner Control Unit Modulating-controlled burner

Control: Main burner continuous

The butterfly valve for air is moved to ignition position in order to start the main burner. The main burner can be started at low-fire rate after the operating signal from the pilot burner has been detected. The control system controls the burner capacity via the butterfly valve for air after the operating state has been signalled. Pilot and main burners can be operated simultaneously.
Application for PFU 780 Burner Control Unit PFU 780..D: High temperature equipment

The flame is controlled indirectly on the basis of the temperature. During the start-up process, as long as the wall temperature is below auto ignition temperature the flame must be controlled by conventional methods. When the working temperature has exceeded 750°C, the safety temperature monitor (STW) takes over the indirect flame control.

Specifications

Electrical Specifications
Mains voltage: 110/120 V AC, -15/+10%, 50/60 Hz,
for grounded and ungrounded mains.
Power consumption: < 8 VA.
Control Inputs: Input voltage/current: Pilot burner, main burner, air valve, multi-flame control and remote reset: 24 V DC, ± 10%, < 7 mA per input.
Input voltage for safety interlocks, digital input DI and purge = mains voltage.
Input voltage of signal inputs: 110/120 V AC Signal "1": 80-132V (50/60Hz)
110/120 V AC Signal "0": 0-20V (50/60Hz)
Inherent current (Signal "1"): typ. 5 mA
Output voltage for voltage-related outputs: mains voltage
Contact rating: Gas valve V1, V2: Max. 1 A resistive; Max. 1 A cos ϕ 0.3

Air valve: Max. 1 A resistive; Max. 1 A cos ϕ 0.3

Ignition: Max. 1 A resistive; Max. 1 A cos ϕ 0.3

Number of operating cycles: Max. 1,000,000 typically 400,000; Max. 250,000, typically 100,000
Output current: max. 2 A per output, but total current for valves
and ignition transformer max. 2.5 A.
Number of operating cycles: Mains switch: 1000
Reset/Information button: 1000
Signalling contacts: max. 24 V, 1 A.
Flame control: Sensor voltage: approx. 230 V AC.
Sensor current: > 1 μA,
Length of sensor cable: max. 100 m.
Fuse in unit: F1: 3.15 A, slow-acting, H pursuant to IEC 127-2/5,
F2: 3.15 A, slow-acting, H pursuant to IEC 127-2/5.
   
General Specifications
Ambient temperature: -20 to +60°C (-4 to +140°F), no condensation
Enclosure: IP 20 pursuant to IEC 529.
Input/Output safety circuit: See connection diagrams in documentation
Weight: approx. 650 g (23 oz.)

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