Control And Safety Unit Program - Cuenod NC4 Instrucciones De Montaje, Servicio

Start-up
Unit SG 1xx operating diagram
Code
x H y y y y
No flame signal at the end of the safety time delay.
x x H y y y
Stray light during the preventilation and the firing.
x x x H y y
Air pressure switch: the contact does not close.
x x x x H y
Air pressure switch: the contact opens on start-up or in service.
y y H x x x
Air pressure switch: the contact is sticked.
y y y y H x
Flame extinguishing in service.
x x H y y y — y y y y y
The unit has been locked purposely.
Code
x
Short luminous signal
y
Long luminous signal
H
Short break
— Long break
Information from the MDE system saved in the blackbox can be read easily using a Cuenoscope or read and extracted by
a computer running the Cuenocom software.
input signals required
output signals
Limiter Air pressure switch
1 Unit and motor start-up
2 Air checking
3 End of preventilation and
transformer firing
4 Fuel valve energising
Push on R
during ...
... less than 9
seconds ...
... between 9
and 13 seconds
...
... more than
13 seconds ...
Description of the defect
Key word
Burner motor Fuel valve
5 Flame and operating
conditions checking
0 Control end
10 Defect mode
01/2005 - Art. Nr. 13 010 553B
GAS control and safety unit with non
... causes ...
continuous operation SG xxx
is an appliance of which the programme
is managed by a microcontroller. It also
release or locking
integrates the defect analysis through
of the control unit.
coded luminous signals.
When the unit is defective, button R
lights on. The defect code appears
every ten seconds until the resetting of
Erasing of the
the unit.
statistics.
Further investigations are possible by
reading the microcontroller non volatile
memory.
The unit ceases to function when the
no effect on the
control unit. voltage falls below the required
minimum value. It restarts automatically
when the normal voltage is restored.
A thermostatically controlled
switching off is compulsory every
twenty four hours.
m
Transformer Flame control
tlw Air pressure switch holding
time
tlk Preventilation time
tvz Pre-firing time
ts Safety time
The removal and setting up of the
unit take place with the unit
de-energised. The unit must be
neither opened nor repaired.
Defect Unlocking
EN
47