Burner control unit BCU 370 Product brochure · GB 6.1.3.2 Edition 12.05 • For modulating, forced draught burners for gas of unlimited capacity in intermittent or continuous operation • Control of fan and butterfly valve • Simple system set-up thanks to optional tightness control and integrated ignition unit • Easy start-up and maintenance thanks to Manual operating mode • Enhanced flexibility and simplified logistics thanks to programmable functions • Easy servicing thanks to informative operating, warning and fault messages • Optionally available with integral field bus interface for simple wiring • EC type-tested and certified, CSA and FM approved www.kromschroeder.com

2 · BCU 370 · Edition 12.05 Burner control unit BCU 370. Application The BCU 370 burner control unit controls, ignites and monitors industrial forced draught burners of unlimited capacity in intermittent or continuous operation. It can be used for directly ignited forced draught burners or forced draught burners ignited with pilot burner. The BCU 370 a ­ ctivates the blower and sets the connected butterfly valve to pre-purging and ignition position. After pre-purge and burner start, the Enable signal is issued to an external controller which positions the butterfly valve in accordance with the...

BCU 370 · Edition 12.05 · 3 Example applications L1 21 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. BCU 370..I1 25 28 26 24 20 19 0 90° 90° 0 22 DG min 9 3 7 DG DL V1 4 VG 5 29 30 31 V2 VG..L 18 17 13 GIK IC 20 B VA DL 32 UV S 23 M 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...

BCU 370 · Edition 12.05 · 4 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. L1 21 BCU 370..D3 25 28 26 24 DG min DG 9 37 DL 45 V1 V2 11 6 29 30 31 DG V3 DG pe/2 VG 13 18 17 GIK VG..L VG DL 32 IC 20 B VA UV S 22 20 19 0 90° 90° 0 23 M

5 · BCU 370 · Edition 12.05 Technical data Mains voltage: BCU..W: 230 V AC, -15/+10%, 50/60 Hz, or BCU..Q: 120 V AC, -15/+10%, 50/60 Hz, for grounded or ungrounded mains. Operation and fault signalling contacts: Dry Contact, max. 1 A, 253 V, not fused internally. Reset/Information button: Max. number of operating cycles: 1000. Flame control with UV sensor or ionisation sensor. Fuse in BCU, replaceable, F1: T 5A H, pursuant to IEC 60127-2/5. Flame signal for: Ionisation control: 1 – 28 μA, UV control: 1 – 35 μA. Permissible UV sensors: Kromschröder models UVS 1, 5, 6, 8 and UVD 1. For intermittent...

6 · BCU 370 · Edition 12.05 Selection Order example BCU 370WI1FEU0D1 BCU 370: for modulating-controlled forced draught burners W Q I1 I2 I3 F E U0 U1 D1 D3 B1* -3* BCU 370 ** ** Type = BCU Mains voltage 230 V AC, 50/60 Hz = W 120 V AC, 50/60 Hz = Q Ignition Electronic ignition, single-pole = I1 Electronic ignition, double-pole = I2** Electronic ignition, double-pole with neutral conductor = I3** Without ignition = no specification Fan control = F Valve control = E Flame control Ionisation control (continuous or intermittent op.) or UV control (intermittent op. with UVS) = U0 UV (continuous operation...