Data sheet
Electronic Oil Burner Control OBC 84.10
Description
The microprocessor based control OBC 84.10 offers stable and precise timings independent of variations in supply voltage and ambient temperature.
The control is undervoltage protected in accordance with EN 298:2012. 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 above 30 kg/h and WLE
•For burners with or without preheater
•Precise and reproducible timings
•Limitation at 1 restart by flame failure within the same operating period
•Limitation of 10 min. on preheating time
•Remote reset and alarm output
•Indication of reason for lockout
•Indication of preheating and operation
Function |
The OBC 84.10 controls the cut-in and cut-out of |
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the oil burner’s components and monitors that |
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the combustion cycle is performed safely. |
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When the boiler thermostat (TR) cuts in, heating |
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of the oil in the oil preheater (OFV) will begin. |
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Once the release temperature is reached and the |
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oil preheater’s thermostat (OTR) cuts in, the |
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burner motor will start the pre-purge and power |
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will simultaneously be applied to the ignition |
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(TT). Following the pre-ignition and pre-purge |
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time, the oil will be released by valve V1 being |
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opened and subsequently V2 will be opened. |
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When the boiler thermostat opens after the |
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heating period power will be cut off and all |
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relays at the outputs will open and be ready for |
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the next start-up cycle. |
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Operating information |
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OBC 84.10 is equipped with a two-coloured LED |
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which displays both the operating status and can |
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indicate the causes of errors leading to lockout. |
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In the event of operating lockout, the cause of |
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error can be read out as a flash code by holding |
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down the reset button for at least 5 seconds and |
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then releasing it. Undervoltage will, however, be |
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displayed automatically. Reset can be performed |
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directly in alarm mode (constant red light) or in |
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flash code mode by pressing the reset button for |
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at least 0.5 seconds but no more than 3 seconds. |
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In flash code mode it is possible to return to |
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alarm mode by holding down the reset button |
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again for at least 5 seconds. |
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 185 V before start-up, the control will be blocked from starting. If the mains voltage falls below 170 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 185 V, the control will restart as normal. Please note that the control cannot be reset if the mains voltage is below 170 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 | 2019.09 |
VD.HN.A3.02 | 1 |
Data sheet |
Electronic Oil Burner Control OBC 84.10 |
•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 one time 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 84.10 processor also monitor the outputsat TT, V1 and V2. If errors like electrical noise (EMC) are registered at the outputs, the control will enter alarm mode.
Note:
OBC 84.10 can only be reset while the supply voltage is connected.
Flash codes
Event |
Code |
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False light |
2 flashes |
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No flame when safety time elapses |
3 flashes |
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More than three restarts in the same |
4 flashes |
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cycle |
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Max. waiting time on preheater overrun |
5 flashes |
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(10 min) |
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Supply voltage above 264 V a.c. |
6 flashes |
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Undervoltage <170 V (automatic) |
8 flashes |
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Application failure (EMC) |
constant |
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flashes |
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2 | © Danfoss | 2019.09 |
VD.HN.A3.02 |
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