Data sheet
Electronic Oil Burner Control OBC 82.12
Description
Function
The microprocessor based control OBC 82.12
offers stable and precise timings independent of
variations in supply voltage and ambient
temperature.
The control is undervoltage protected.
The OBC 82.12 controls the cut-in and cut-out of
the oil burner’s components and monitors that
the combustion cycle is performed safely.
When the boiler thermostat (TR) cuts in, heating
of the oil in the oil preheater (OFV) will begin.
Once the release temperature is reached and the
oil preheater’s thermostat (OTR) cuts in, the
burner motor will start the pre-purge and power
will simultaneously be applied to the ignition
(TT). Following the pre-ignition and pre-purge
time, the oil will be released by valve V1 being
opened and subsequently V2 will be opened.
When the boiler thermostat opens after the
heating period power will be cut off and all
relays at the outputs will open and be ready for
the next start-up cycle.
Operating information
OBC 82.12 is equipped with a two-coloured LED
which displays both the operating status and can
indicate the causes of errors leading to lockout.
In the event of operating lockout, the cause of
error can be read out as a flash code by holding
down the reset button for at least 5 seconds and
then releasing it. Undervoltage will, however, be
displayed automatically. Reset can be performed
directly in alarm mode (constant red light) or in
flash code mode by pressing the reset button for
at least 0.5 seconds, but no more than 3 seconds.
In flash code mode it is possible to return to
alarm mode by holding down the reset button
again for at least 5 seconds.
In case of undervoltage the control will prevent
the burner from starting and simultaneously
show a flash code. Besides this, up to five other
fault types can be read out as flash codes when
the control is in lockout.
The design complies with the requirements of
the RoHS and WEEE directive.
Application and features
• For 2 stage burners up to 30 kg/h
• For burners with or without preheater
• Precise and reproducible timings
• Limitation at 3 restarts by flame failure within
the same operating period
• Limitation of 10 min. on preheating time
• Remote alarm output
• Indication of reason for lockout
• Indication of preheating and operation
Normal operation
When the boiler thermostat (TR) cuts in, the reset
button flashes green. As soon as the preheater
thermostat (OTR) cuts in, the reset button lights
up constant green. When the boiler thermostat
cuts out, the green light turns off.
Errors during operation (flash codes):
• If the mains voltage falls below 176 V before
start-up, the control will be blocked from
starting. If the mains voltage falls below 165 V
during operation, the oil supply and burner
will be stopped. In both cases, the reset
button will automatically flash 8 times.
When the mains voltages reaches 176 V, the
control will restart as normal. Please note
that the control cannot be reset if the mains
voltage is below 165 V.
• If the mains voltage exceeds 264 V, the control
will automatically enter alarm mode.
The purpose of the overvoltage cut out is
not simply to protect the electronics in the
control, but also the other components in
the burner.
• If light is registered in the final stage of the
pre-purge time, the control will not release
oil and will enter alarm mode.
• If no flame is established at the start, i.e. by
the end of the safety time, the control will
enter alarm mode.
© Danfoss | 2019.10
VD.HN.C1.02 | 1
Data sheet Electronic Oil Burner Control OBC 82.12
• In the event of a flame failure during
operation, the oil supply will be cut off after
no more than 1 second and the control will
restart the burner. If flame failure occurs more
than three times in the same operating period
(TR connected), the control will enter alarm
mode.
• If the release temperature in the preheater is
not reached within 10 minutes, the control
will enter alarm mode.
The OBC 82.12 processor also monitors the
outputs at TT, V1 and V2. If errors like electrical
noise (EMC) are registered at the outputs, the
control will enter alarm mode.
Note:
OBC 82.12 can only be reset while the sup ply voltage is connected.
Flash codes
Event Code
False light 2 flashes
No flame when safety time elapses 3 flashes
More than three restar ts in the same
cycle
Max. waiting time on preheater overrun
(10 mi n)
Supply voltage above 264 V a.c. 6 flashes
Undervoltage <170 V (automatic) 8 flashes
Application failure (EMC)
4 flashes
5 flashes
constant
flashes
2 | © Danfoss | 2019.10
Symbols
Boiler thermostat
High temperature cutout
Ignition unit
Burner motor
Solenoid valve
Photo unit or UV sensor
External alarm
L Phase wire
N Neutral wire
Oil preheater ⁄ Oil preheater thermostat
Hold relay
* Due to the initia lisation of the electroni cs it may take up to two secon ds before ignition is enabl ed
Time function/explanation
Output signals of control
Required input signals
A’ Initiation of burners with oil preheater OFV
A Initiation of burners without oil preheater
B Flame formation
C Operation position
D Burner stop
tw Heating of oil preheater until OTR switches on
t1 Pre-purge 13 s
t2 Safety time 10 s
t3* Pre-ignition 13 s
t4 Inter val V1-V2 15 s
t3n Post-ignition 15 s
VD.HN.C1.02
Data sheet Electronic Oil Burner Control OBC 82.12
Technical data
Ordering
Rated voltage 230 V~
Operating range 195-253 V~
Frequency 50-60 Hz ± 6%
Consumption 6 VA
Reset Immediately
Reaction time on flame failure Max. 1 s
Undervoltage protection <165 V +/- 2 V
Protection class II
Pollution degree 2
Main fuse (terminal load, see electrial diagram) Max. 10 A
Cable connection Plate for 5 PG 11 screwed connections or plate with knockouts
Ambient temperature -20 to +60°C
Installation Any position
Enclosure IP40
Flame monitoring UV, LD or LDS
Required flame signal
Max. cable length between OBC and UV, LD/LDS 20 m (installed separately)
Description Weight Code no.
OBC 82.12 200 g 057H 8716
Base BHB 70 g 057H7010
Front plate for BHB, 5 × PG 11 12 g 05 7H7 011
Front plate for BHB, 8 × knockouts 12 g 057H7012
No flame / dark ≤5 A
Flame / light ≥65 A
Please note!
The OBC 82.12 does not meet the requirements of
EN 298 regarding level of undervoltage protection
and is hereby not CE compliant, for the same
reason the level of CO2 shall not exceed 12% on
the exhaust.
The EN 298 demand for undervoltage protection
applies only for burner controls used in the EU
and associated countries and it is not requested
in other countries.
This control box cannot be sold into countries as
a standalone product or mounted on oil burners
where EN 298 is requested to be fulfilled.
Please note that the control box is designed in the
manner that it does fulfil all other requirements
within the Low Voltage Directive (LVD) and Electromagnetic Compatibility Directive (EMCD).
VD.HN.C1.02
© Danfoss | 2019.10 | 3
Data sheet Electronic Oil Burner Control OBC 82.12
Dimensions
Additional documentation on burner components is available on http://heating.danfoss.com/ or https://store.danfoss.com/
4 | © Danfoss | DHS-SDBT/DK | 2019.10
VD.HN.C1.02
Loading...