Burner Control Unit BCU 370

The BCU (burner control unit) 370 controls, ignites, and monitors industrial forced air burners of unlimited capacity in intermittent or continuous operation. It can be used for directly ignited forced air burners or forced air burners ignited with a pilot burner. The burner control unit activates the blower and sets the connected butterfly valve to the pre-purging and ignition position. After the pre-purge and burner start, an enable signal is sent to an external controller that positions the butterfly valve according to the output demand. Post-purge occurs after the end of the burner operation. The BCU 370 monitors the gas and air pressure, an integrated tightness control function (optional) checks the valves with an external gas pressure switch.

The quick-start option allows standard-compliant start-up of a forced air burner without pre-purge after normal shutdown. This means unnecessary air won’t get into the combustion chamber. The heat output is available as quickly as possible after a temperature demand.

The program status, the unit parameters, and the level of the flame signal can be read directly from the unit. An integrated manual mode allows you to start a burner and set the butterfly valve position independently of the central control system. The BCSoft operator-control and setting software provides a powerful tool for start-up and servicing.

To reduce the installation and wiring costs, Kromschroder offers an optional Profibus-DP interface to transfer the activation signals and feedback

View the Animation (flash required)

Features

• Modulation of forced air gas burners of unlimited capacity in intermittent or continuous operation
• Control of fan and butterfly valves
• Simple system set-up with optional tightness control and integrated ignition unit
• Easy start-up and maintenance in manual operating mode
• Enhanced flexibility and simplified logistics with programmable functions
• Easy servicing with user-friendly operating, warning, and fault messages
• Available with optional integral field bus interface for simple wiring
• EC type-tested and certified, CSA and FM approved

	Documentation Manufacturer's Product Brochure Manufacturer's Operating Instructions Manufacturer's Technical Sheet
	Ordering Information Model Description Price (US List) Order Now BCU 370QFEU0D1 Without ignition; Mains voltage: 120 V AC, 50/60 Hz $572 BCU 370QI1FEU0D1 Electronic ignition, single-pole; Mains voltage: 120 V AC, 50/60 Hz $702 BCU 370QI1FEU0D1B1 Electronic ignition, single-pole, and ProfiBUS-DP; Mains voltage: 120 V AC, 50/60 Hz $927 BCU 370QFEU0D3B1-3 With tightness control, ProifiBUS-DP and butterfly valve control over ProfiBUS; Mains voltage: 120 V AC, 50/60 Hz $1200 BCU 370WFEU0D1 Without ignition; Mains voltage: 230 V AC, 50/60 Hz $611 For all other configurations Contact Combustion 911 Accessories Model Description Price (US List) Order Now BCU OPTO Opto-adapter (serial port connection) includes BCSoft CD-ROM $284
	Applications Click on images for close-up view. Modulating-controlled forced draught burner The BCU 370 controls the blower and moves the butterfly valve to pre-purging and ignition position. It issues the Enable signal to the control system after start-up of the burner. Modulating-controlled forced draught burner with tightness control In addition to controlling the forced draught burner, the burner control unit also monitors the fail-safe function of the two solenoid valves for gas via the DG gas pressure switch. Modulating-controlled forced draught burner with pilot burner and tightness control A pilot burner ignites the main burner and is switched off during the main burner’s safety time.
	Specifications Electrical Mains voltage: 120 V AC, -15/+10%, 50/60 Hz, for grounded or ungrounded mains. Power consumption: Approx. 9 VA plus approx. 50 VA for integrated ignition Voltage to inputs, valves, fan, controller enable, actuator and ignition unit: mains voltage Flame control with UV sensor or ionisation sensor: Ionisation control: 1 – 28 µA UV control: 1 – 35 µA Input voltage signal inputs: Signal "1": 80-126.5 V Signal "0": 0-20V Input current signal "1": Typ. 2 mA Output to ignition transformer: No-switch contacts via semi-conductor Max. number of operating cycles: 250,000     Contact Ratings Valves: Max. 1 A, cos φ = 1 Butterfly valves: Max. 1 A, cos φ = 1 Ignition: Max. 1 A, cos φ = 0.3 Controller enable signal: Max. 1 A, cos φ = 1, the contacts may be loaded with a max. total of 2.5 A Fan: Max. 3 A, start-up current: Max. 6.5 A < 1 s. The outputs may be loaded with a max. total of 4 A. Operation and fault signalling contacts: Dry Contact, max. 1 A, 253 V, not fused internally Reset/Information button: Max. number of operating cycles: 1000 Fuse in BCU, replaceable, F1: T 5A H, pursuant to IEC 60127-2/5 Permissible UV sensors: Elster Kromschroder models UVS 1, 5, 6, 8 and UVD 1     Operation and Environment Maximum length of ignition cable with integrated electronic ignition: 1 m Maximum length of ionisation/UV cable: 50 m (164 ft) Ambient temperature: BCU 370: -20 – +60 °C (-4 – +140 °F) BCU 370..I: -10 – +60 °C (14 – +140 °F) no condensation permitted     Construction Materials Enclosure: IP 54 pursuant to IEC 529 Housing: impact-resistant and heat-resistant plastic Upper section: Plug-in upper section with operating and display elements Lower section: connection terminals, earthing strip and prewired neutral bus with spacious wiring chamber Connections: 1x M25 multiple screw connector, 4x 7 mm cable grommets. 2x M20 multiple screw connectors, 2x 7 mm cable grommets, and loosely enclosed. 1x or 2x M16 plastic screw connector(s) for the ignition cable(s). Weight: Approx. 1.8 kg (4 lbs.)