Honeywell BCU 460 Manual

6 Edition 11.19
Technical Information · GB
• For burners in intermittent operation or in continuous operation
• Flame control by UV, ionization or a further option of using the
furnace chamber temperature
• Simple system integration using the PC programming and
diagnostic software BCSoft
• With optional valve proving system
• With optional operating modes to reduce thermal NOx
• Fieldbus connection (PROFIBUS, PROFINET, EtherNet/IP) using
optional bus module
Burner control units BCU 460, BCU 465

BCU 460, BCU 465 · Edition 11.19 2
▼= To be continued
Contents
Burner control units BCU 460, BCU 465.............1
Contents ............................................2
1 Application ........................................6
1.1 Application examples ..............................8
1.1.1 Single-stage-controlled burner .......................8
1.1.2 PROFINET connection using bus module BCM ......9
1.1.3 Staged control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.1.4 Modulating control with defined ignition position ...11
1.1.5 Two-stage-controlled burner........................ 12
1.1.6 Single-stage-controlled burner with pneumatic
ratio control system .......................................13
1.1.7 Flame control using the temperature ...............14
1.1.8 Flameless mode to reduce NOxformation ..........15
1.1.9 ON/OFF rotary impulse control .....................16
1.1.10 Modulating burner control .........................18
2 Certification ..................................... 19
3 Function ......................................... 20
3.1 Part designations ................................ 20
3.2 Connection diagram ..............................21
3.2.1 BCU460..E1/LM 400..F0..E1
with ionization control in double-electrode operation.....21
3.2.2 BCU460..E1/LM 400..F3..E1
with ionization control in double-electrode operation....22
3.2.3 BCU465..E1/LM 400..F3..E1
with ionization control in double-electrode operation....23
3.2.4 BCU460..P3..E1/LM 400..F0..E1
with industrial plug for ionization control in double-
electrode operation .......................................24
3.2.5 BCU460..P3..E1/LM 400..F3..E1
with industrial plug for ionization control in double-
electrode operation .......................................25
3.2.6 BCU465..P3..E1/LM 400..F3..E1
with industrial plug for ionization control in double-
electrode operation .......................................26
3.2.7 Flame control.........................................27
3.2.8 Assignment of connection terminals ...............28
3.3 BCU 460 program sequence .................... 30
3.4 BCU 465 program sequence .....................31
4 Air control ....................................... 33
4.1 Capacity control ..................................34
4.1.1 BCU..F1 ..............................................34
4.1.2 BCU..F3..............................................35
5 Low NOxmode (flameless operation) ............ 36
5.1 System structure and function ...................36
5.2 BCU..D2...........................................38
6 Valve proving system ............................ 40
6.1 Tightness control ................................ 40
6.1.1 Test instant ...........................................41
6.1.2 Program sequence .................................. 42
6.1.3 Test period tP........................................44
6.1.4 Opening time tL.....................................44
6.1.5 Measurement time tM..............................45
6.2 Proof of closure function ........................ 48
6.2.1 Program sequence ..................................48
7 BCSoft ........................................... 49
8 Fieldbus communication ........................ 50
8.1 BCU and bus module BCM .......................51
8.2 Configuration, planning ..........................52
8.2.1 Device master data file (GSD), electronic data
sheet (EDS) ................................................ 52
8.3 PROFINET, EtherNet/IP ..........................53
8.3.1 Modules for process data . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.3.2 Device parameters and statistics ...................58
8.4 PROFIBUS ........................................59
9 Program step/status ............................ 60
10 Fault signalling ..................................61
11 Parameters ..................................... 64
11.1 Application parameters..........................64
11.2 Interface parameters ............................69

BCU 460, BCU 465 · Edition 11.19 3
▼= To be continued
11.3 Scanning the parameters........................72
11.4 Flame control ....................................73
11.4.1 Burner 1 flame signal FS1 switch-off threshold...73
11.4.2 Burner 2 flame signal FS2 switch-off threshold...73
11.4.3 Flame simulation check in standby position ...... 74
11.4.4 High temperature operation .......................75
11.5 Behaviour during start-up .......................78
11.5.1 Burner 1 start-up attempts ........................78
11.5.2 Burner application .................................79
11.5.3 Safety time 1 tSA1..............................................83
11.5.4 Flame proving period 1 tFS1 .......................83
11.6 Behaviour during operation .....................84
11.6.1 Restart..............................................84
11.6.2 Minimum operating time tB.......................85
11.6.3 Auxiliary gas function ..............................86
11.7 Safety limits......................................87
11.7.1 Delayed low air pressure protection.................87
11.7.2 Safety time during operation .......................88
11.8 Air control ........................................89
11.8.1 Pre-purge time tPV .................................89
11.8.2 Pre-ventilation time tVL......................................89
11.8.3 Over-run time tNL ..............................................90
11.8.4 Running time selection ............................90
11.8.5 Running time ........................................91
11.8.6 Over-run.............................................91
11.8.7 Air actuator control.................................93
11.8.8 Air actuator can be activated externally on start-
up ..........................................................95
11.8.9 Air actuator in the event of fault....................95
11.8.10 Pre-ventilation/flameless ........................96
11.8.11 Flameless operation ...............................97
11.8.12 Combustion mode ................................98
11.8.13 Over-run time, flameless tNL.....................99
11.9 Valve check ....................................100
11.9.1 Valve proving system..............................100
11.9.2 Relief valve (VPS)..................................100
11.9.3 Measurement time for Vp1 ........................101
11.9.4 Valve opening time tL1 ............................101
11.10 Behaviour during start-up....................102
11.10.1 Minimum pause time tMP .......................102
11.11 Manual mode.................................102
11.11.1 Operating time in Manual mode.................102
11.12 Sensors.......................................103
11.12.1 Function of sensor 1 .............................103
11.12.2 Function of sensor 2.............................104
11.12.3 Function of sensor 3.............................105
11.12.4 Proof of closure function test period ............105
11.13 Communication ..............................106
11.13.1 Fieldbus communication ........................106
11.13.2 K-SafetyLink .....................................106
11.13.3 Safety interlocks (bus) ...........................107
11.13.4 Purge (bus).......................................107
11.13.5 High temperature operation (bus)...............107
11.13.6 LDS (bus) ........................................107
11.14 Interface parameters .........................108
11.14.1 Flame control ....................................108
11.14.2 Air actuator.......................................109
11.14.3 Function of terminal 64..........................112
11.15 Functions of contacts 80 to 97 ..............113
11.15.1 Contact 80, 81/82 function .....................113
11.15.2 Contact 90, 91/92 function .....................113
11.15.3 Function of contact 95/96 ......................113
11.15.4 Function of contact 95/97 ......................113
11.15.5 Contact 85/86, 87 function .....................113
11.16 Functions of inputs at terminals 1 to 7 and
35to41 .............................................114
11.16.1 Function of input 1 ..............................114
11.16.2 Function of input 2 ..............................115
11.16.3 Function of input 3 ..............................115
11.16.4 Function of input 4 ..............................115
11.16.5 Function of input 5 ..............................115
11.16.6 Function of input 6 ..............................115
11.16.7 Function of input 7...............................115
11.16.8 Function of input 35 .............................115
11.16.9 Function of input 36 .............................116
11.16.10 Function of input 37............................116
11.16.11 Function of input 38 ...........................116
11.16.12 Function of input 39 ...........................116

BCU 460, BCU 465 · Edition 11.19 4
▼= To be continued
11.16.13 Function of input 40 ...........................116
11.16.14 Function of input 41............................116
12 Replacement possibilities ......................117
13 Selection ......................................119
13.1 Burner control unit BCU .......................119
13.1.1 Type code..........................................119
13.2 Power module LM 400 ........................120
13.2.1 Type code..........................................120
14 Project planning information .................. 121
14.1 Installation..................................... 121
14.2 Commissioning ................................ 121
14.3 Electrical connection ..........................122
14.3.1 Safety current inputs..............................123
14.4 Actuators ......................................124
14.5 Parameter chip card ...........................124
14.6 K-SafetyLink ...................................124
14.7 Overload protection ...........................124
14.8 Calculating the safety time tSA.......................125
15 Accessories....................................126
15.1 High-voltage cable ............................126
15.2 Industrial plug connector, 16-pin .............126
15.3 BCSoft .........................................126
15.3.1 Opto-adapter PCO 200 ...........................126
15.4 Connection plug set . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
15.5 Set of language stickers ....................... 127
15.6 Fastening set .................................. 127
15.7 External securing bars......................... 127
15.8 Bus module BCM 400 ......................... 127
15.9 Flange plates ..................................128
16 BCM 400 ......................................129
16.1 Application.....................................129
16.2 Function .......................................129
16.3 Electrical connection ..........................129
16.4 Commissioning .................................131
16.5 Selection .......................................132
16.6 Technical data .................................132
17 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
17.1 Electrical data..................................133
17.2 Mechanical data ...............................134
17.3 Ambient conditions ............................135
17.4 Dimensions ....................................135
18 Converting units...............................136
19 Safety-specific characteristic values for SIL
and PL............................................136
20 Safety information in accordance with
EN61508-2 ...................................... 137
20.1 General .........................................137
20.2 Interfaces.......................................137
20.3 Communication ................................137
20.4 SIL and PL for BCU 4 ..........................138
21 Maintenance ..................................139
22 Legend ........................................140
23 Glossary....................................... 141
23.1 Waiting time tW.................................141
23.2 Safety time on start-up tSA1 ...................141
23.3 Ignition time tZ.................................141
23.4 Safety time during operation tSB .................... 141
23.5 Safety interlocks................................141
23.6 Safety shut-down ............................. 142
23.7 Safety shut-down with subsequent lock-out
(fault lock-out) ...................................... 142
23.8 Warning signal................................. 142
23.9 Timeout........................................ 142
23.10 Lifting ........................................143
23.11 Air actuator...................................143

BCU 460, BCU 465 · Edition 11.19 5
▼= To be continued
23.12 Safe failure fraction SFF .....................143
23.13 Diagnostic coverage DC .....................143
23.14 Mode of operation ...........................143
23.15 Probability of dangerous failure PFHD......144
23.16 Mean time to dangerous failure MTTFd.....144
Feedback .........................................145
Contact...........................................145

BCU 460, BCU 465 · Edition 11.19 6
Application
1 Application
The next-generation burner control unit BCU460/465
unites the components of automatic burner control
unit, ignition transformer, Manual/Automatic mode,
display of operating and fault statuses and a user inter-
face (HMI) in a compact metal housing. It replaces the
previous product line with the same name. It is suitable
for almost every conceivable multiple burner applica-
tion in the metal, ceramics, food and automotive indus-
tries.
It can be used for directly ignited industrial burners of
unlimited capacity. The burners may be modulating-
controlled or stage-controlled. Installation in the imme-
diate vicinity of the burner being monitored simplifies
system integration.
On industrial furnaces, it reduces the load on the cen-
tral furnace control by taking over tasks that relate to
the burner, for example it ensures that the burner ig-
nites in a safe condition when it is restarted.
The air control on the BCU..F1 or F3 assists the furnace
control for cooling, purging and capacity control tasks.
The burner control unit has an interface via which an air
valve or actuator can be controlled for staged or modu-
lating burner capacity control.
The program status, device parameters, error codes,
statistics and level of the flame signal can be read eas-
ily and conveniently on the four-digit device display.
The burner can be controlled manually for commission-
ing, maintenance and diagnostic purposes.
Energy management using phase reduces the instal-
lation and cabling costs. The valves and ignition trans-
former are powered by phaseL1/the voltage supply for
the BCU instead of the safety interlocks.
The monitored outputs for the actuator and valve are
housed in the plug-in power module LM400. This can
easily be replaced if necessary.
▼

BCU 460, BCU 465 · Edition 11.19 7
Application
Power module LM400 with connections for valves, actuator
and parameterizable signalling contacts
Thanks to the optionally integrated valve proving sys-
tem, the valves can be checked for leaks by querying
an external gas pressure switch or it can be checked
whether gas valves are closed.
As an option, the BCU can be configured with high tem-
perature operation and an operating mode for low NOx
emissions. In High temperature mode, the BCU can
monitor the flame indirectly using the temperature. The
Low NOx mode leads to a significant reduction in ther-
mal NOx formation in ON/OFF-controlled high-velocity
burners due to its flameless operation.
Using the BCSoft program, the parameters, analysis
and diagnostic information can be read from a BCU via
the optionally available opto-adapter. If necessary, the
device parameters can be adjusted easily using BCSoft.
All valid parameters are saved on an integrated param-
eter chip card. The parameter chip card can be removed
from the old unit and inserted into a new BCU to trans-
fer the parameters, for example when replacing the unit.
The burner control unit is IIoT-compatible using the bus
module BCM400. The BCU can be networked with a
standardized fieldbus system (PROFIBUS, PROFINET
or EtherNet/IP) using the BCM. Networking in a field-
bus system enables the burner control unit BCU to be
controlled and monitored by an automation system
(e.g.PLC). This also opens up a wide range of process
visualization possibilities.
Bus module BCM400 for internal connection to the BCU

BCU 460, BCU 465 · Edition 11.19 8
Application
1.1 Application examples
1.1.1 Single-stage-controlled burner
Control: ON/OFF.
The gas/air mixture is adjusted to the requirements of
the applications using the parameters of pre-ventila-
tion and post-ventilation. The pressure switch moni-
tors the air flow in the air supply line or in the flue gas
exhaust.
BICR
VG..L
VR..R
BCU 465..F3
60 61
3
DI
L1, N, PE
µC
P
4 1
81
82
95
96
A
P
35
2
6
65 36
HT Start
1
PLC

BCU 460, BCU 465 · Edition 11.19 9
Application
1.1.2 PROFINET connection using bus module BCM
1 2 3
L1
BUS
FCU
P
HT
PROFINET
BCM
BCU 4xx
BCMBCM
BCU 4xx BCU 4xx
PLC
The bus system transfers the control signals from the
automation system (PLC) to the BCU/BCM for starting,
resetting, controlling the air valve, purging the furnace
or for cooling and heating during operation. In the op-
posite direction, it sends operating status, the level of
the flame signal and the current program status.
Control signals that are relevant for safety, such as the
safety interlocks, purge and HTinput, are wired inde-
pendently of the bus communication using separate
cables.

BCU 460, BCU 465 · Edition 11.19 10
Application
1.1.3 Staged control
VAS VAG
V1 V2
V3
UVS
VAS 1
BCU 460..F1
60 61 62 65 66 22
3 6
µC
81
82
95
96
35 2
Process control (PCC)
P
4
A
1
Start 1
HT
40 41
BVA
IC 40
4
12
16 DI 1
7
DI 2
M
µC
FCU 500 PLC
The central control system starts the pre-purge. Input
DI2 is activated via the output at terminal 66 of the
BCU and the butterfly valve BVA is set to the pre-purge
position.
In the event of a temperature demand, the burner con-
trol unit BCU activates input DI1 via the output at ter-
minal 65 and moves the butterfly valve to the ignition
position (condition: the IC40 must have reached the
ignition position on the instant of ignition). The burner
starts.
The burner application “Burner 1 with pilot gas” (pa-
rameter A078=1) is selected so that the burner can be
started with a limited start fuel flow rate.
To activate the high-fire rate, DI2 is actuated via the air
valve output at terminal66 of the BCU.
The butterfly valve moves cyclically between the high-
fire and low-fire rate position, see page110 (Operat-
ing mode 11).
DI 1/V1 DI 2/Air valve IC 40 position Valve position
Off Off closed Closed
On Off low Ignition position/Low-fire
rate
On On middle High-fire rate
Off On high Pre-purge

BCU 460, BCU 465 · Edition 11.19 11
Application
1.1.4 Modulating control with defined ignition
position
VAS VAG
V1 V2
V3
UVS
VAS 1
BCU 460..F1
60 61 62 65 66 22
3 6
µC
81
82
95
96
35 2
Process control (PCC)
P
4
A
1
Start 1
HT
40 41
BVA
IC 40
4
12
16 DI 1
7
DI 2
M
µC
18
IN
mA
FCU 500 PLC
The central control system starts the pre-purge. Input
DI2 is activated via the air valve output of the BCU and
the butterfly valve BVA is set to the pre-purge position.
In the event of a temperature demand, the burner con-
trol unit BCU activates input DI1 via the output at ter-
minal 65 and moves the butterfly valve to the ignition
position (condition: the IC40 must have reached the
ignition position on the instant of ignition). The burner
starts.
The burner application “Burner 1 with pilot gas” (pa-
rameter A078=1) is selected so that the burner can be
started with a limited start fuel flow rate.
During operation, the BCU activates DI1 and DI2 using
outputs 65 and66. This enables the analogue input IN
on the actuator IC40. Depending on the capacity de-
mand of the temperature controller, the butterfly valve
BVA moves steplessly between the low-fire rate and the
high-fire rate to the position specified by the analogue
input IN, see page110 (Operating mode 27).
DI 1/V1 DI 2/Air valve IC 40 position Valve position
Off Off closed Closed
On Off low Ignition position/Low-
fire rate
On On analogue chart 1 In acc. with chart 1
Off On high Pre-purge/High-fire rate

BCU 460, BCU 465 · Edition 11.19 12
Application
1.1.5 Two-stage-controlled burner
VR..L
BCU 460
LM..F3
60 61 62 65 22
µC
81
82
95
96
Process control (PCC)
FCU 500
VAS VAG
V1 V2
V3
VAS 1
UVS
4
A
2
1
Start 1
3
P
35
6
HT
PLC
Control:
ON/OFF or High/Low
The BCU provides the cooling and purging processes.
Parameter A078 = 4 is selected so that the two-stage
burner starts at low-fire rate. When the operating state
is reached, the BCU advises the control unit. Depend-
ing on the parameter setting, the air valve on terminal
65 is actuated to open and close by the program or ex-
ternally via the input at terminal4.

BCU 460, BCU 465 · Edition 11.19 13
Application
1.1.6 Single-stage-controlled burner with
pneumatic ratio control system
BICR
VG..L
VR..R
BCU 465..F3
60 61
3
DI
L1, N, PE
µC
P
4 1
81
82
95
96
A
P
35
2
6
65 36
HT Start
1
PLC
Control: ON/OFF.
The BCU provides the cooling and purging processes.
The variable air/gas ratio control compensates for gas/
air pressure fluctuations. Optional: the pressure switch
monitors the air flow during pre-purge and operation.
The gas/air mixture is adjusted to the requirements of
the application using the parameters of pre-ventilation
and post-ventilation.

BCU 460, BCU 465 · Edition 11.19 14
Application
1.1.7 Flame control using the temperature
FCU 500..H1
M
HT
18
HT
HT
BCU 46x..D1
6
22
µC
BCU 46x..D1
6
22
µC
5-8
STM
In high temperature systems (temperature >750°C),
the flame may be controlled indirectly via the tempera-
ture. As long as the temperature in the furnace chamber
is below 750°C, the flame must be controlled by con-
ventional methods.
If the temperature in the furnace chamber rises above
the spontaneous ignition temperature of the gas/air
mixture (>750°C), the FCU signals to the burner con-
trol units via the fail-safe HT output that the furnace
system is in High temperature mode (HT). When the
HTinput is activated, the burner control units switch to
High temperature mode. They operate without evaluat-
ing the flame signal and their internal flame control is
non-functional.
If the furnace temperature falls below the spontaneous
ignition temperature (<750°C), the FCU disconnects
the HToutput from the electrical power supply. There is
no longer an active signal at the HT inputs of the burner
control units. The flame signals are monitored once
again by the UV sensor or flame rod.
In the event of a fault in a temperature monitoring com-
ponent (e.g. sensor discontinuity, sensor short-circuit)
or in the event of a mains failure, the flame control task
is transferred to the burner control units.

BCU 460, BCU 465 · Edition 11.19 15
Application
1.1.8 Flameless mode to reduce NOxformation
VAD
BIC..M
IC 40 + BVH
M
VAS..L
VMV
DG
BCU 465..D2
PZL
Process Control (PCC)
AKT
STM
The burner control unit BCU 465 switches the burner
BIC..M ON/OFF in cycles. Burner BIC..M is controlled
without pneumatic air/gas ratio control system. The gas
supply pressure is controlled by the gas pressure regu-
latorVAD; the required burner capacity is set using the
fine-adjusting valveVMV. The capacity is controlled by
actuator IC40 and butterfly valveBVH. An air pressure
switch upstream of the burner monitors the functioning
of the butterfly valve. In addition, air/gas ratio monitor-
ing for the zone or the furnace is required.
As soon as the safety temperature monitor STM signals
a furnace temperature of ≥850°C (1562°F), the burner
can be switched to flameless combustion (Low NOx
mode) to significantly reduce NOxemissions.
Switching to Low NOxmode eliminates the counter-
pressure by the flame in the ceramic tubeTSC. At a
constant gas supply pressure, the gas volume increases
by approximately15%. In Low NOxmode, the butterfly
valve moves to a smaller open position tailored to the
pressure conditions.

BCU 460, BCU 465 · Edition 11.19 16
Application
1.1.9 ON/OFF rotary impulse
control
For processes which require a turn-
down of more than 10:1 and/or
those which require heavy circula-
tion of the furnace atmosphere to
ensure a uniform temperature, e.g.
heat treatment furnaces operating
at low and medium temperatures in
the metallurgical industry.
With ON/OFF cyclic control, the
capacity supplied to the process is
controlled by means of a variable
ratio of the operating time to the
pause time. In this type of control,
the burner output pulse frequency
always maintains full momentum
and results in maximum convection
in the furnace chamber, even with
regulated heating.
▼
M
PZL PZH PZ
PZL PDZ
TE
M
BCU 460/
LM..F3
BCU 460/
LM..F3
FCU 500..F0
µC P
DG DG DG
VAS VAS
VAS
VCG
VCG
VR..L
VR..L
DG DG
DGmin DG max
49 15 131450
45
47 4858
>750°
pu/2
ϑ1
46
2
3
DLmin DL Purge
STM

BCU 460, BCU 465 · Edition 11.19 17
Application
The pneumatic ratio control sys-
tem controls the gas pressure on
the burner proportionally to the air
pressure and thus maintains a con-
stant air/gas ratio. At the same time,
it acts as a low air pressure protec-
tion device.
The ignition and monitoring of the
individual burners is ensured by
burner control unit BCU460 with
power module LM..F3.
The centrally checked safety func-
tions such as pre-purge, tightness
test, flow detector and pressure
switch check (gasmin., gasmax.,
airmin.) are provided by the FCU500.
M
PZL PZH PZ
PZL PDZ
TE
M
BCU 460/
LM..F3
BCU 460/
LM..F3
FCU 500..F0
µC P
DG DG DG
VAS VAS
VAS
VCG
VCG
VR..L
VR..L
DG DG
DGmin DG max
49 15 131450
45
47 4858
>750°
pu/2
ϑ1
46
2
3
DLmin DL Purge
STM

BCU 460, BCU 465 · Edition 11.19 18
Application
1.1.10 Modulating burner control
The centrally checked safety func-
tions such as pre-purge, setting the
valve to ignition position via a but-
terfly valve control system, tight-
ness test, flow detector and pres-
sure switch check (gasmin., gasmax.,
airmin.) are provided by the FCU500.
The capacity can be adjusted con-
tinuously by activating the control
element (analogue or 3-point step
signal).
To ensure that the correct air vol-
ume is available for ignition (start
fuel flow rate) when starting the
burners, the FCU sends the burner
start enable signal to the BCUs via
the “LDS (limits during start-up)”
output.
The circuit design of the safety
interlock and LDS outputs on the
FCU and the corresponding in-
puts on the BCUs ensures that the
burners can only start if the safety
interlocks and the LDS output have
enabled burner start-up.
BCU 460..F0
FCU 500..F1
µC
P
DG DG DG
VAS VAS
VCG
VCG
DGmin DG max
49 15 131450
53
45
47 4858
pu/2
M
PZL PZH PZ
PZL PDZ
TE
BCU 460..F0
M
M
TC
90°➔0°
0°➔90°
54
55
VAS
DGDG
>750°
ϑ1
2
3
DLmin DL Purge
66
66
16
57
STM

BCU 460, BCU 465 · Edition 11.19 19
Certification
2 Certification
Certificates – see Docuthek.
Certified to SIL and PL
For systems up to SIL 3 pursuant to EN 61508 and PL
e pursuant to ISO 13849
EU certified*
– 2014/35/EU (LVD), Low Voltage Directive
– 2014/30/EU (EMC), Electromagnetic Compatibility
Directive
– (EU) 2016/426 (GAR), Gas Appliances Regulation
– EN 13611:2015+AC:2016
– EN 1854:2010, class S
FM approved
Factory Mutual (FM) Research Class: 7610 “Combus-
tion Safeguards and Flame Sensing Systems”. Suitable
for applications pursuant to NFPA 86.
www.approvalguide.com
Eurasian Customs Union
The products BCU460 and BCU465 meet the techni-
cal specifications of the Eurasian Customs Union.

BCU 460, BCU 465 · Edition 11.19 20
Function
3 Function
3.1 Part designations
2
6
3
1
789
4
10
5
1
LED display for program status and fault messages
To display the program status or fault message and, in conjunction
with the Reset/Information button, to display the flame signal and the
fault history or to view and set device parameters.
2On/Off button
To switch the control unit on or off
3
Reset/Information button
To reset the control unit to its starting position in the event of a fault.
System faults (internal errors) can only be acknowledged using this
button.
4Connection for opto-adapter
5BCU type label
6Power module, replaceable
7Power module type label
8Parameter chip card (PCC), replaceable
9Bus module, replaceable
10 M5 screw terminal for burner ground
There are two control keys for the control unit:
OK
ON/OFF
Use the ON/OFF key to switch the control unit on or off.
Reset/Information
The control unit is reset to its starting position in the event of a fault
using the Reset/Information button.
During operation, the LED display1shows the program
status. The flame signal intensity, the fault history and
the parameters can be called up on the display by re-
peatedly pressing the Reset/Information button (for
1s). The parameter display is ended 60seconds after
the last time the button is pressed or by switching off
theBCU. When the BCU is switched off, – – is displayed.
The parameters cannot be scanned when the BCU is
switched off or when a fault/warning is displayed.
Display Information
F1
Flame signal intensity:
Burner 1
H0
to
H9
Last event message
to
tenth to last event message
001
to
999
Parameter 001
to
parameter 999