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Combustion 911
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an Olsträd Engineering Company

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Burner Control Unit BCU 480

BCU 480T-10/5/2LR3

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  • For pilot and main burners of unlimited capacity in intermittent or continuous operation pursuant to EN 746-2
  • First safety time on startup: 10 seconds
  • Second safety time on startup: 5 seconds
  • Safety time during operation: 2 seconds
  • Voltage: 115 V AC, -15/+10%, 50/60 Hz
  • Compatible ignition transformer: TZI 7,5-12/100
  • Automatic burner control unit, ignition transformer, indicators, and operating controls are in a space-saving metal housing that replaces the local burner control cabinet
  • Flame control is by UV, ionization or another option using the furnace chamber temperature
  • Display of the program status, unit parameters, and flame signal
  • Manual mode for burner adjustment and for diagnostic purposes
  • Programming and diagnostic software BCSoft simplifies logistics management
  • Spacious connection chamber with plug-in terminal blocks and plug-in cable sockets for quick installation and servicing
  • 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
Ignition Cable
Silicon Rubber Cable High Voltage 7mm (priced per foot).

Applications

Click on images for close-up view.

Application for BCU 480 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. This reduces the main burner start-up time. 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. The BCU provides the cooling and purging processes.
Application for BCU 480 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. This reduces the time required by the main burner for starting up. The BCU provides the cooling and purging processes.
Application for BCU 480 Burner Control Unit Two-stage-controlled main burner with permanent pilot burner
Control: Main burner ON/OFF with ignition via bypass

The main burner can be started at low-fire rate after the operating signal from the pilot burner has been detected. When the operating state is reached, the BCU issues the Enable signal for the maximum burner capacity. Pilot and main burners can be operated simultaneously. This reduces the time required by the main burner for starting up. The BCU provides the cooling and purging processes.
Application for BCU 480 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. This reduces the time required by the main burner for starting up.

Specifications

Electrical
Mains voltage: 115 V AC, -15/+10 %, 50/60 Hz for grounded and ungrounded mains
Power consumption: approx. 9 VA plus inherent consumption of the ignition transformer (50/60 Hz).
Voltage to inputs and valves: mains voltage
Signal and control line: max. 2.5 mm2 (AWG 14)
Cable for burner earth/PE wire: 4 mm2 (AWG 12)
Input voltage signal inputs: Signal "1": 80 - 126,5
Signal "2": 0 - 20
Frequency: 50/60 Hz
Inherent current: Signal "1" typ. 2 mA
Output current: Max. 2 A per output, but total current for valves and ignition transformer: max. 2.5 A.
Operation and fault signaling contacts: dry contact, max. 2 A, 264 V, not fused internally.
Flame control: Sensor voltage: approx. 230 VAC
Sensor current: > 1 µA
Length of sensor cable: max. 50 m (164 ft.)
Fuse in unit: F1: 3.15 A, slow-acting, H pursuant to IEC 127-2/5
F3: 3.15 A, slow-acting, H pursuant to IEC 127-2/5 (on BCU..C).
Ignition Transformer
Type: TZI 7-25/20
Power consumption (115 V AC input): 2.2 (1.6) A*
Power consumption (output): 7 KV 25 (18)* mA
*values in parentheses apply to 60 Hz.
Operation and fault signaling contacts
Signaling contact (not floating): max. 2 A, 264 V, not internally fused
Max. number of operating cycles: 1,000,000
Mains switch: 1000
Reset/Information button: 1000
Operation and Environment
Length of Burner cables: max. 5 m. (16.4 ft.)
Ambient temperature: -20°C (-4°F) to +60°C (+140°F) (no condensation permitted)
Construction Materials
Enclosure: IP 54 pursuant to IEC 529
Housing: Die-cast aluminium with plug-in terminal blocks and plug-in M20 cable glands.
Weight: Approx. 5 kg (11 lbs.) depending on version.

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