WS CBF-B1 User manual

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
vor00161
PROPERTIES
APPLICATION RANGE
WS CBF-
/CBFF burner control boxes with Profibus DP
combine
essential control components such as flame relay,
ignition trans
former, manual and auto operation, as well as
status display in a compact metal housing. Mounted near
individual burners they are designed for continuous as well
as intermittent operation.
Two models are available:
(CBF-B1*) (Control Box Flame-Profibus) for Rekumat
®
-
burners in flame mode only
(CBFF-B1*) (Control Box FLOX-Flame-Profibus) for R
e-
kumat
®
-burners in flame mode, FLOX
®
mode
or FLOX
®
-Flame mode
The control boxes include extensive diagnostic capa
bilities
for ease of start-
up, maintenance and trouble shooting.
The built in two-
digit display can visualize program status,
flame signal strength and device parameter settings. In
manual mode it is possible to start burners step-by-step.
A PC or laptop computer can be connected to indi
vidual
control boxes via an optical interface cable. WSSoft e
n-
ables user access to device parameters as well as detailed
diagnostic and data logging functions. WSSoft and the i
n-
terface cable are optional features.
Substantial savings in engineering-, installation-
and
commis
sioning costs can be achieved when utilizing
Profibus capabili
ties. A two wire bus system communicates
all burner related control signals and status information b
e-
tween a central process control unit (e.g. SPS) and dece
n-
tralized CBF/CBFF control boxes.
Power supply and safety relevant signals such as in
terlocks
and FLOX/flame release signals can be hardwired directly
to the control boxes (see Fig. 1).
Individual control boxes are co
nnected to the bus system
via a separate plug connector, which has two terminals for
incoming and outgoing bus wires. Control boxes at the end
of a bus sys
tem may be terminated by means of an easily
accessible switch, enabling a termination resistor.
*) –
B1 with Profibus DP ® registered trademark of WS GmbH
•Standard-Hardware with integrated flame relay and cus-
tomizable Software in a cast aluminum hous
ing
(200x200x110mm). Protection rating IP54.
•Connection terminal for power supply 230V 50/60 Hz (op-
tional 115V AC).
•Works with grounded or ground free grid.
•Release signal input 230V AC (optional 115V AC) via proc-
ess safety interlock (load for ignition transformer and con-
nected solenoid valves are present).
•
Ignition transformer optional inside control box or external
mount.
•Dynamic self supervision with adjustable sen
sitivity of
flame relay strength and flame relay safety times.
•Flame supervision via flame rod (1 or 2 elec
trodes) or UV
probe
•Intermittent or constant operation (only with ionisation)
•Configurable failure response (e.g. reset, multiple reset,
air purge after reset)
•Air volume supervision via delta-p switch.
•Configurable control parameters (Min. On and Off times,
air valve lag time)
•
Configurable air valve control with air valve closure in case
of fault
•Cooling air utilizing combustion air valve or optional addi-
tional cooling air valve via Profibus cooling signal.
•Profibus DP interface
incl. Connector and configurable
Profibus address switches includes GSD file.
•Profibus DP control (remote reset, heat de
mand signal, air
purge, cooling).
•Profibus DP burner status outputs.
•
Program status, ionization current and fault displayed
(LED)
•Manual operation for burner tuning and diagnosis
•Manual reset button on control unit housing (Reset-
/Info
button)
•Access to burner fault information, diagnostics and statisti-
cal information (cont. tally of faults, operating hours, burner
on times, ignition attempts etc.) for service and mainte-
nance via optical interface cable and WSSoft.
•POC function (proof of closure) for main valve switch (pa-
rameterizeable)
Additional features of CBFF-B1-control box:
•Failsafe inputs for activation of FLOX/Flame mode with in-
tegrated gas valve switching FLOX/Flame.
•FLOX gas valve can be connected.
•
Input for supervision of air purge and combustion air flow
in FLOX mode via delta-p switch.
Decentralized Burner Control Box in a compact
metal housing for WS-REKUMAT



-
Burners in flame
mode (CBF-B1) and FLOX



-Flame mode (CBFF-
B1)
with Profibus DP
Picture 1 – WS CBF-/CBFF burner control box

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
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Fig. 1 – Burner control via CBF/CBFF with Profibus ( schematic):
SPS,PLC, CPE
L1,N, PE
BUS
FLOX
-
GWS
CBFF
-
B1
BUS
X2:
PC
C
CBF
-
B1
X2:
BUS
CBF
-
B1
X2:
BUS
Power supply, safety interlock, FLOX-Flame
Bus wire
1
2
3
A maximum of 126 devices (masters and slaves) can be connected in one sys
tem. Each device is identified by a unique
Profibus address. Readily accessi
ble switches inside CBF/CBFF control boxes allow for easy address selection (range
1…126). All devices are connected in a bus fashion (in series, in line), each line segmen
t may consist of up to 32 devices
(masters or slaves). The two open ends of each bus segment must be terminated with active bus termi
nators. Terminators
must have a constant power supply to guarantee error free operation. CBF/CBFF control boxes may be terminated by acti-
vating a switch located inside the Profibus connector.
Multiple line segments (>32 devices) or long wire runs require repeaters to boost signal strength.
In order to reduce electromagnetic interference it is required to use shielded wire (e.g. Lapp Unitronic order # 2170-
220T or
Siemens order # 6XV1830-OEH10). Shield must be diligently fastened to ground terminals of connected devices and po-
tential equalization between multiple devices may be required.
To further reduce risk of interference keep bus wires separate from other wir
ing. Data wires A and B must not be cross
connected.
(Refer to applicable engineering guide lines and regulations)
Fig. 2: Profibus connector:
1B 2A 2B
8 3
6 5 1
CBF-B1/CBFF-B1 – Control box
220
grün
grün
red
red
shield shield
Incomming bus cable
Outgoing bus cable to next CBF-B1/CBFF-B1
1A
5
9
6
1
Sub-D 9-pin
Variosub Profibus connector
9-pin
Kroms-No. 74960431
Note: Power supply 230V 50/60Hz (optional 115V 50/60Hz) is hardwired directly to the control boxes CBF-B1/CBFF-B1
according to the included connection diagram. It must be saved dependent on length and width of wire, tempera-
ture or connected load.
Removable flange plate and connector terminals for easy exchange of control boxes while operating. Bus connec-
tor can be pulled without bus interruption
PROFIBUS DP with CBF-B1/CBFF-B1

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
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Busanschluss Profibus DP:
CBF-/CBFF control boxes are equipped with a bus connector on the bottom of the control box lid ( 9-pin SUB-D female con-
nector). A Variosub-D male connector (9-pin insert) is available to complete the system. It includes 2 cable grips for cables
ranging from 5 – 9 mm, connection terminals, ground clamp and termination resistor. Device termination can be activated
via an external dip switch. Terminator resistance is approximately 200 Ohm. Confirm this value with a resistance reading
between pins 3 and 8, with control box powered down. Bus connector terminal is labeled 1A,1B,2A,2B. Bus wires must not
be cross connected, confirm that wire colors and corresponding terminal letters match.
Wire coloring is not standardized. When using cables with red and green wires it has been established that green wire be
connected to A and red wire be connected to B. Incoming wires connect to 1A, 1B outgoing wires connect to 2A,2B. Wire
shield must be sufficiently connected to ground terminal (refer to applicable guides of the manufacturer of the Profibus con-
nectors).
Fig. 3 Control box dimensions CBF(F)-B1:
Supplier ident.: 0x05DB
ASIC-Type: SPC3
SYNC-, FREEZE-capable
Baud rate detection: automatic
Min. cycle time: 0,1 ms
Diagnostic bytes: 6 (DP-Norm)
Parameter bytes: 7 (DP-Norm)
I/O-Bytes: Programmer can choose data to be transmitted
(refer to Tab.2 – Tab.4 )
Inputs: Outputs:
CBF (F)-B1 Basic I/O: 2 Bytes (EB0, EB1) 1 Byte (AB0)
CBF (F)-B1 Standard I/O: 4 Bytes (EB0...EB3) 1 Byte (AB0)
Baud rate: up to 1500 kbit/s
Max. range of a segment is determined by baud rate:
Tab.1: baud rate - range
baud rate (kbit/s) :
93,75 187,5 500 1500
range (m) :
1200 1000 400 200
Above range may be increased by installing repeaters. It is not recommended to install more than 3 repeaters in series.
Technical Data Prof
i
bus DP :

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
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Device specific parameters must be considered during PROFIBUS-DP system configuration. In order to simplify this proc-
ess, CBF-B1/CBFF-B1 control boxes are supplied with a data file containing these parameters (GSD). The file format is
standardized and recognizable by other Profibus devices (masters/slaves). The bus interface will remain operable (online)
even if the CBF-/CBFF-B1 is turned off (stand-by mode) The setting of the Profibus addresses can be done by using the ad-
dress selector switches within the Profibus control box (Picture 2).
Picture 2 – Profibus address selectors:
Following tables showing data transmission between master and slave (CBF-B1/CBFF-B1).
Tab.2 : Output byte ( Master →CBF(F) :
Bit Output byte AB0
0 Remote reset
1 Start (heat demand)
2 Cooling
3 Air purge
4
5
6
7
Tab.3: Input bytes (CBF(F) →Master ):
Bit EB0 EB1 EB2 EB3
0 Operation burner Manual mode Status byte*
1 Fault burner Cooling valve ON
2 Air valve ON Safety interlock
3 Purge air ON open
µA-flame signal
0...255,
255=25,5µA
4 Cooling ON open
5 Flame mode ON (CBFF) open
6 FLOX mode ON (CBFF) open
7 Stand-by open
*) see Tab.4
Configuration:
Address selector switches
10
1
10
0
+
( i.e. address 116 : B (11x 10
1
) + 6 (10
0
) = 110 + 6 = 116 )
Data Transmission (Bytes/Bits) from Master to CBF(F)
-
B1:

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
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Tab.4: Status byte EB2 – Signal Referencing ( CBF(F) →Master):
Byte
(decimal)
Display static= S
flashing = B
Text CBF CBFF
0 00 S Ready x x
1 A1 S Waiting time x x
2 A2 S Safety time during start-up x x
3 A3 S Flame stabilizing period x x
4 A4 S Flame mode x x
5 A5 S FLOX mode x
6 P0 S Air purge x x
7 C0 S Cooling x x
8 Reserve
9 Reserve
10 00 B Proof of Closure (USA) x x
11 A1 B False flame signal x x
12 A2 B Start up without flame signal x x
13 A3 B Loss of signal during stabilizing period x x
14 A4 B Flame failure x x
15 d0 B Delta-p switch failure x
16 d2 B Start up without air pressure x
17 d3 B No air pressure during stabilizing time x
18 d4 B No air pressure in Flame mode x
19 dP B No air pressure during purge x
20 10 B Remote reset limit exceeded (5x/15 min)** x x
21 d5 B No air pressure in FLOX mode x
22 FF B FLOX-Flame switching fault x
51 51 B Defective fuse f1 or safety interlock x x
52 52 B Permanent remote reset signal x x
53 53 B Cycle time too short x x
54 54 B Manual operation: Flox locked out x
**) „10“ will flash in display if more than 5 remote resets were attempted via the bus within 15 minutes. Further remote
resets are not possible, burner must be reset manually at the burner control box. ( Limitation is implemented to prevent
continuous resetting in case of a bus failure) Local reset will re-enable remote reset.
During operation the 7-segment display will show the current program status. Flame signal strength and other parameters
will be displayed by repeatedly pressing the Reset/Info button.
Should a fault occur, the CBF-/CBFF will terminate operation and display a flashing fault code. Meaning of fault code can be
determined from fault schedule attached to front of control box (see Fig. 2) Fault schedule is available in several languages
and can be exchanged easily. CBF-/CBFF DP will display „- -„ signalising stand-by mode if the box is turned off. The bus
system will remain functional to enable communication to other devices. Control outputs of CBF-B1/CBFF-B1 (ignition, sole-
noid valves) are electrically separated from the power supply.
Fig. 2 : Fault Schedule (English):
Permanent
Display Blinking
Start position 00
Waiting time A1 Flame signal at start
Safety time on start-up A2 Flame failure during start-up
Flame proving period A3 Flame failure during proving period
Normal operation flame A4 Flame failure during operation
Normal operation FLOX A5
dx Failure pressure switch
FF Failure FLOX-flame switching control
Purge P0
Cooling C0
51 Fuse F1 fault or safety chain interlock
52 Permanent remote reset
53 Cycle time too short
54 Manual operation: FLOX mode locked
Pb Bus fault
Power switch off - -
dimensions: 83x44,25mm
Status Information and P
a
rameters
:

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
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Tab. 4 : Parameters
Nr. Parameter Range CBF-B1 CBF-B1
typ.
CBFF-B1
CBFF-B1
typ.
01 Ionization current 0...30 µA x - x
-
02 Burner shut-off limit 1...20 µA x 1 x 1
03 Last program status prior to shut-off 0...5 x 0 x
0
04 Flame mode
1)
0/1 - - x
1*
05 Flox mode
1)
0/1 - - x
1*
06 ∆p-supervision 0/1 - - x
1**
07 Start-up attempts
1)
1...4 x 1 x
1
08 Automatic start-up attempts 0/1 x 0 x
0
0 = air valve closed
09 Behaviour air
valve at fault 1 = open air on heat demand
0/1 x 0 x
0
10 Safety time during start-up
1)
3/5/10 sec. x 3 x
3
11 Safety time during operation
1)
1/2 sec. x 1 x
1
12 Flame stabilizing period 0...25 sec. x 2 x
2
13 Purge after reset
3)
0...25 sec. x 0 x
0
14 Min. burner ON time 0...25 sec. x 10 x
10
15 Min. burner OFF time 0...25 sec. x 10 x
10
16 Air valve lag time on OFF 0...5 sec. x 0 x
0
0 = unlimited
17 Manual 1 = limited ( 5 min.) 0/1 x 1 x
1
0 = cooling off
1 = with cooling air valve
2 = with air valve
18 Cooling
3 = with air and cooling air
valve
0...3 x 0 x
0
0 = no POC monitoring
19 POC-HGV
limit switch 1 = POC monitoring (USA
1) 2)
)
0/1 x 0 x
0
20 Time for air purge (at start up)
3)
1...25 sec. x 1x
1
1) Parameters can only be changed by WS (Hardware key required).
2) Burners with output > 117 kW, a main gas valve with limit switch has to be used. At start-up the limit switch must be closed. After activation
of the gas valve and after the safety period, the switch must have left the shut position. [proof of closure - (POC) acc. NFPA 86]
3) Air purge after reset: The larger parameter (13, 20) is relevant if burner starts with the heat demand signal. In normal mode, the time for air
purge from field 20 is active. The burner will start up (when command “heat” is set) in mode air purge (xx sec.) and afterwards it will heat for
the minimum activation time (setting) or as long as the heat demand signal is on. Minimum OFF time begins with termination of heat de-
mand. Burner will not restart until minimum OFF time has elapsed, even if heat demand is present. Even if the heat demand is cancelled
during air purge, the burner will fire for the minimum activation time.
x Parameter changeable / recallable
- Parameter setting not available
*) Depending to the burner, FLOX-, Flame- or FLOX/Flam-mode can be parameterized.
( “0“ = disabled / “1“ = active)
**) CBFF-B1: delta-p switch can be parameterized for flame only mode. For FLOX mode, a delta-p switch for FLOX mode is necessary. A con-
nected and parameterized delta-p switch also controls air purge. If the delta-p s. does not switch a fault signal is shown but the air purge will
continue anyway
If CBFF-B1control box is ON, the parameters can be shown on the display by pressing the reset or info button repeatedly. A delta-p switch
can be connected to the control unit for the gas valve. In this case the gas valve will be closed if delta-p is too low.
Note.: An active command for air purge or cooling will block the signal for retrieving the temperature.

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
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Before starting the power supply 230V AC (optional 115V AC) and release signal input via process safety chain has to be
connected directly to the CBF(F)-B1 control box according to supplied electrical drawings. Input of safety chain is charged
by load of ignition transformer an the connected gas valves. The load for air valves and for the CBF(F)-B1 control box is
charged from terminal X2.1.
For burners in FLOX mode a CBFF-B1 control box has to be used. Additionally the fail save inputs for the switching signals
for Flame and FLOX mode from the fail save FLOX temperature monitoring system has to be connected to the CBFF-B1
control box. To disengage FLOX mode an active signal level (230V AC L1-level optional 115V AC) at the FLOX input is
necessary and the furnace temperature must be surely above 850°C.
In this case the input fur Flame mode must be disabled. On the other hand when the temperature falls below 850°C the
FLOX input has to be disabled and the Flame input has to be enabled. The switching must be done within 1 sec. otherwise a
fault signal (FF “blinking”) will be caused.
The supplied connector for Profibus (bus cables included) has to be installed according to electrical drawing (p. 3). Profibus
version reduces wiring, as only power supply and safety interlocks (230V) must be run to the box in addition to the bus ca-
ble.
Control cables for the burner components are pre-installed and only require hook up on site. The unit is pre-wired and tested
for functionality prior to delivery. An electrical schematic is located on the inside of the box lid. Each box is marked with an
individual serial number, located on the side of the box.
On the lid two push-buttons, ON/OFF and Reset/Info, are mounted below the 2 digit display. These buttons are also used
for manual burner control. A fault schedule for failure code interpretation is inserted into a pouch on the lid as well.
Activation and feed-back is according to data transmission handling (p. 4/5) from master to control boxes
Before start-up of FLOX burner, the connectors and signals of FLOX mode and Flame mode have to be checked ex-
actly and the settings have to be tested for correct functionality with closed gas supply – in case of wrong connec-
tion:
explosion hazard
Fig. 5: Connection diagram CBF-B1 with Profibus
Hardware connection CBF(F)
-
B1
:

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
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Fig. 6: Connection diagram CBFF-B1 with Profibus
Technical Data CBF(F)
-
B1:
Power supply:
230V~, -15/+10% 50/60 Hz
115V~, -15/+10% 50/60 Hz (option)
grounded and ground-free grids
load: approx. 9 VA + valves and ignition trans
former
load
Control voltage for valves = Supply voltage
Current: max. 2 A per output
Total current for valves and ignition transform
er: max.
2,5 A (load current on terminal X2.5)
Flame safety: Sensor voltage ca. 230V~, sensor cu
r-
rent: > 1µA (UV or ionization)
Cable length: max. 5 m
Device fuses:
F1: 3,15A, slow, H, according IEC 127-2/5,
F2: 5 A, slow, H, according IEC 127-2/5 (F2 chang
e-
able at WS only)
F3: 3,15A, H, slow IEC 127-2/5 for air valves (on ci
r-
cuit board)
Fault outputs: max. 2 A, 264V AC, no in
ternal fuse
(closed when fault)
Fault message also via Profibus DP
Input Flox, Flame, Air-Diff.-DS
: 230V~ (optional
115V~), load current per input approx. 3 mA
Max. switching cycles: 1.000.000
Ambient temperature: -
20 to + 60°C, dew formation
not permitted
Protection rating: IP 54 according EC 529
Weight: approx. 5 kg
Profibus-connection: via Variosub Profibus 9-pin
connector. Sub D (female)
(male counter connector avai-
lable as option)
Housing made of cast aluminum with removable flange
plate max. 2 cable grips M20x1,5mm for power supply.
Disengaging burner via Flame-FLOX activation signal
(burners with Flox function/CBFF-B1-control).
max. 2 cable grips (5 cables) M32x1,5mm for burner
connection, 4 threaded borings M6 in back panel for
mounting. Ground cable for burner is included (Cu blank
2,5 mm
2
)
Dimensions approx. 200x200x110mm (LxWxH)
Supervision cable: max. 5 m (High voltage cable)
Ignition cable: Recommended < 1m, max. 5m. ignition
load is reduced with increasing cable length. Do not run
in metal conduits, run separate of other cables. Use
shielded spark plug caps (1 kΩresistor).
CBF-B1 burner control unit is in accordance with low vol-
tage guideline (73/23/EWG), EMV-Richtlinie
(89/336/EWG) and EN 298.

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
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Turn off power to control box by pressing Power 0/1 button on front panel.
Press Reset-/Info button while simultaneously pressing Power 0/1 button until 2 flashing dots appear in the display. Manual
mode is now activated. The display shows the program status “00”. To activate next step in program press Reset/Info but-
ton and release.
Burners with FLOX function (CBFF-B1) must have reached process temperature (>850°C) to use manual mode. If FLOX
switching temperature has not reached yet and burners are started in manual mode the display will show fault “54”.
Note:
As default, manual mode is terminated after 5 min. of inactivity. The burner returns to ready state “00”. Control box must be
powered down and powered back up to return to automatic operation. Unlimited manual operation can be selected via
WSSoft by setting Parameter 17 = 0.
Caution: Electrical shocks can be fatal!
Any work on electrical components must be performed by trained and authorized personnel only! Trouble shooting by au-
thorized personnel only!
Lock-out and tag-out power supply! Do not attempt to repair internal components of CBF control boxes (warranty void). In-
correct repair attempts e.g. connecting power to outputs, can lead to unsafe operation conditions and destroy the control
box.
Resetting burners remotely is only permitted for qualified personnel, under continuous monitoring of faulting burner.
Gas and air adjustment must be according to values provided on test certificates.
In case of a fault burner control unit will close gas valves and display will flash a fault code.
- After several unsuccessful reset attempts, the combustion chamber must be purged with air to remove any combustible
mixtures.
- CBF control boxes can only be reset when a flashing fault code is displayed.
- Should all known faults be eliminated, internal components of the control box may be damaged. Please return unit to
WS for evaluation.
- Prove all safety features after any maintenance or repair work:
Flame mode:
Close gas supply (shut manual gas valve)
Attempt to fire burner (manual or auto)
Burner must fault!
FLOX mode:
Close air valve (e.g. pull air valve connector)
Attempt to fire burner (manual or auto)
Burner must fault!
Burner operation man
ual mode:
Manual mode Flame only:
Step : Display: Function:
00 -00 Manual mode
01 -P0 Air valve open
02 -A1→A2→A3 Gas valve open,
ignition ON
03 -A4 operating status
04 -00 Heating OFF
05 -C0 Cooling ON
06 -00 Cooling OFF
07 starts with step “00“
08
09
Manual
mode FLOX only
:
Display: Function:
-00 Manual mode
-P0 Air valve open
-A5 FLOX gas open
-00 FLOX mode OFF
-C0 Cooling ON
-00 Cooling OFF
starts with step “00“
Manual mode Flame and FLOX:
Display: Function:
-00 Manual mode
-P0 Air valve open
-A1→A2→A3 Gas valve open,
ignition ON
-A4 Flame mode
-00 Flame mode OFF
-P0 Air valve open
-A5 Floxgas valve open
-00 FLOX mode OFF
-C0 Cooling ON
-00 Cooling OFF
starts with step “00“
Fault handling
:

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Profibus DP – CBF-B1/CBFF-B1 Burner Control Box
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Tab. 6: Trouble shooting CBF(F)-B1
Fault Error / Cause Check / Solve
“A1“ flashing False flame
CBF is detecting a flame when
burner is off. Flare up of uncom-
busted fuel, UV-Probe not wired cor-
rectly
Eliminate flare up: install gas lance purge
air with limiting orifice, clean limiting ori-
fice, program air lag, check UV-Probe,
gas leak between gas lance nozzle and
ceramic electrode sleeve, conductive
ceramic electrode sleeve at high tem-
peratures, gas valve too far from burner,
increase min. OFF
“A2“ flashing Start-up without flame signal, mix-
ture failure, ignition error
Check gas and air valve functionality,
check gas and air flow adjustments,
check functionality of delta-p switch,
confirm proper gas type, check ignition
spark and transformer, spark forming at
wrong location?; ground wire con-
nected?, static supply pressures suffi-
cient?, gas and air valves opening de-
layed? Is flame forming?
“A3“ flashing Loss of flame during stabilizing pe-
riod, flame blow off, exhaust gas not
extracted, gas or air
See above ;
Check flame signal strength, eliminate
gas and air pressure fluctuations, ex-
haust restricted or closed up, distance
recuperator to inner tube incorrect, dis-
tance cross in radiant tube missing, igni-
tion and supervision cables run in same
conduit with other cables, defective gas
lance nozzle, defective or plugged gas
lance, defective combustion chamber,
air flow correct, UV-probe defective,
quartz glass broken or covered with soot,
combustion chamber back pressures to
high
“A4“ flashing Flame loss during operation See above;
Ionisation current losses due to conduc-
tive ceramic electrode sleeve, flame is
not touching supervision electrode, soot
on electrode, electrode deteriorated re-
place, confirm gas and air volume flow
settings, check functionality of delta-p
switch,
“00” flashing Failure POC main valve limit switch Check switch setting; correct connectors
at switch? if main valve is not active
POC switch must signalize the off-
position of valve
“10” flashing Remote reset limit exceeded, max. 5
resets within 15 minutes allowed
maybe bus failure
Check burner; check bus reset signal, try
local reset.
After 15 min. without reset, remote reset
limit will be unlocked automatically.
“d0” flashing Only CBFF-B1
Delta-p switch (DPS) failure in non-
operative mode control
DPS does not switch back to normal pos.
air valve open? measured pressure pipe
blocked – clean an check pipes
DPS defective