Safety Unit - Cuenod NC4 R101A Instrucciones De Montaje

Commissioning

Safety unit

Operational diagram
Symbol
34
Pressing and ... leads to ...
holding the R
for...
... 1 second ... the control unit being
unlocked.
... 2 seconds ... the control unit being
manually locked.
... 9 seconds ... the statistics in the
control unit to be
erased.
BP1 control button BP1
BP2 control button BP2
Description
Awaiting heating request
Awaiting reheater
(for burners with reheaters)
Fan motor activated
Igniter activated
Flame present
12/2008 - Art. Nr. 4200 1013 9300A
The fuel oil safety unit controls and
monitors the forced draught burner. The
microprocessor-controlled program
sequence ensures extremely stable
cycle times, regardless of fluctuations in
the power supply voltage or the ambient
temperature.
The automatic combustion control unit is
designed to detect brownouts.
Whenever the supply voltage drops
below its rated minimum level, the
control unit shuts down - even in the
absence of a malfunction signal. The
control unit switches itself back on again
once the voltage has returned to normal
levels.
Locking and unlocking the system
The control unit can be manually locked
(switched to malfunction mode) and
unlocked (malfunction cleared) by
pressing the R reset button, provided the
system is connected to the mains power
supply.
If the button is pressed during normal
operation or start-up, the unit enters
malfunction mode. If the button is
pressed in malfunction mode following a
safety shutdown, the control unit is
unlocked.
Display
Display A4 indicates the burner status,
the different operating cycle phases, any
faults (plus identification of their
causes), and operating statistics.
Always switch off the power
supply before installing or
removing the control unit. Do
not attempt to open or carry out
repairs on the control unit.