Initial start−up, inspection and maintenance
15
Burner control unit
You may use the following burner
control units with this burner:
Burner control unit LOA 14.171B2V
For
programming sequence
, see the
wiring diagram on page 25.
Sensor current:
H
min. requirement 50
µ
A
H
max. permissible without flame
5.5
µ
A
Undervoltage
When the mains voltage falls below
165 V~, the burner will be prevented
from starting or the oil flow will be
interrupted; simultaneously the
system will be initiating a fault
shutdown.
Fault position
A lamp in the reset button also
indicates the fault shutdown of the
burner control unit.
Burner control unit LMO 14.113A2
For
programming sequence
, see the
wiring diagram on page 25.
Sensor current:
H
min. requirement 40
µ
A
H
max. permissible without flame
5.5
µ
A
Undervoltage
If the mains voltage falls below
165V~ the burner control unit
initiates a safety shutdown.
The system re−starts when the mains
voltage rises again above approx.
175 V~.
Please note:
If the power supply is 2×127 V and a
red flashing code: 10×flashing (see
page 19) refer to your local
Viessmann sales office.
Controlled intermittent operation
After a maximum of 24 hours
non−stop operation, the burner
control unit implements an
automatic safety shutdown with
subsequent re−start.
Control sequence in case of faults
The fuel valve outputs and the
ignition system are immediately shut
down (< 1 s) if the system shuts
down because of faults.
Cause
Response
After mains power failure
Re−start
After falling below the undervoltage level
Re−start
In case of premature, faulty flame signal during the
pre−flush time t1
Fault shutdown at the end of the pre−flush time
t1
In case of premature, faulty flame signal during the
oil pre−heat time t0
Starting will be inhibited after a maximum of
40sec. fault shutdown
If the burner does not light within the safety limit t2
Fault shutdown at the end of the safety period t2
If the flame fails during operation
Max. 3 start repeats, then fault shutdown
No heating or oil pre−heater enabling within 10 min.
Fault shutdown
System creates a fault shutdown
After a fault shutdown, the burner
control unit remains locked out
(non−modifiable fault shutdown) and
the red lamp illuminates.
This state is also maintained after
the mains power supply has failed.
Resetting the boiler control unit
The system can be immediately reset
after a fault shutdown. Hold down
the reset button for approx. 1 sec.
(<3 s).
Ignition sequence
The system is re−ignited, if the flame
fails within the safety period,
however not later than at the end of
the safety period. This allows several
ignition attempts within the safety
period, see program sequence on
page 25.
Repeat restriction
The system may be re−ignited up to
3times, if the flame fails during
operation. The fourth flame failure
during operation triggers a fault
shutdown. The count of these
repeats begins with every controlled
switch−on (through temperature or
pressure regulators, thermostat or
pressure limiters or safety limiters).
5692452 GB
