Dungs DGAI. 69F Manual - Página 2

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Automatic gas burner control
DGAI.69F
The automatic gas burner control
mounted on a PCB operates with elec-
tronic timers.
Therefore exact switching times are
ensured during voltage and tempera-
ture fluctuations or very short switch-
ing cycles.
The DGAI.69F comprises:
• controller for program flow
• flame monitoring operating accord-
ing to the ionisation principle
• exhaust gas monitor and exhaust gas
sensor (NTC resistor) or 1 MΩ resistor
instead of exhaust gas sensor.

Functional description

On receipt of a heat request from the
regulator, the LPG pre-valve opens.
After a startup delay period of about
10 s during which startup self-monitor-
ing is performed internally, the ignition
starts and the ignition gas valve opens.
The ignition is switched off by the igni-
tion flame signal, and switches over to
the so-called stabilising period during
which the ignition flame must burn
properly.

Functional / circuit diagram DGAI.69F

AW
Exhaust
gas
switch
AW
X3/1 X3/2 X1/6
X1/5
X1/3 X1/4
AS
GDW
NTC

Wiring diagram DGAI. 69F

X 3
162
1
2
AS
AW
AW
Exhaust gas switch
AS
Exhaust gas sensor
B
Operation
FE
Remote unlock facility
GDW
Gas pressure switch
If the ignition flame goes out within the
stabilising period, the ignition cuts in
again immediately.
After the stabilising period, the main
gas valve is opened provided that the
flame is present.
The ignition flame remains connected
during the complete burner operation
period.
In the case of flame failure during
operation, the main gas valve is closed
within 1 s and a re-ignition attempt is
performed immediately.
When the regulator is switched off, the
LPG, ignition and main gas valves are
switched off.
On receipt of a flame signal before fuel
release, startup is blocked.
When exhaust gas flows from the flow
protection relay, the equipment
switches off and this is followed by an
exhaust gas delay period.
HR
FW
STR
ZR
HR
STR
F1
X2/3
X1/1
Regulator
50 Hz 230 V AC
N
L1
X 1
41
34
111
1
2
3
4
5
6
R
LPG
GDW
St 2
L 1
IE
LPG
PE-B
R
St
Timer
ZR
SZA
Amplifer
FW
FW
HR
X1/2
X2/2
X2/1
X2/10
X2/9 X2/8
Ignition
Ignition
burner
Remote
PE
N
unlock
Main burner
facility
41a
50
35
7
8
1
2
3
4
N
St
Y 1
FE
B
onisation electrode
LP gas valve
Burner ground
Regulator
Fault
Exhaust gas switch as per EN 297/
VP100
A heat sensor (NTC resistor) monitors
the temperature at the draft interrupt-
er. In case of irregular exhaust gas
outlet the exhaust gas monitor switch-
es off at approx. 65°C. After switch-off
by the exhaust gas monitor, a timer is
activated. Its time sequence starts
when the exhaust gas sensor cools
down to below 55°C.
The time sequence is approx. 15 min.,
the burner remains blocked even after
the exhaust gas sensor has cooled
down until the time sequence is termi-
nated.
The exhaust gas sensor and its lines
are monitored for interruption. A short
circuit also leads to switch-off in the
same way as excessive temperature.
The DGAI.69F therefore operates only
with the exhaust gas sensor connected
or an appropriate spare resistor (1Ω).
FW
ZR
X1/7
X2/5 X2/4
X2/7 X2/6
X1/8
Gas solenoid valves
N
N
Ignition gas Main gas
X 2
36
54
11
5
6
7
8
9
10
N
N
N
ZT
ZE
IE
Y 2
St 2
External fault
Y1
Ignition gas solenoid valve
Y2
Main gas solenoid valve
ZT
Ignition facility
ZE
Ignition electrode
2 ... 4