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Automatic gas burnercontrol for gas burnerswithout fan, with intermit-tent ignition burner andexhaust gas monitoring

DGAI. 69F

1.32

P r i n t e d

i n

G

e r m

a n y

· R

ö s l e r D r u c k

•

E d

i t i o n

0 6 . 0 4

•

N r . 2 2 5

7 5 5

Technical description

The D G A I.69F is an autom atic g as burner

control as p er EN 298 w ith the follow ing

features:

•Ionisation flam e m onitor

•Ignition flam e b urns continuously dur-

ing heat req uest

•Restart attem pt in case of flam e failure

in operation

•Exhaust gas m onitor by m eans of N TC

sensor

•Program sequence control by m eans

of electronic tim ers

•Burner ignition by m eans of external

ignition facilities

•Ignition gas solenoid valve

•M ain g as solenoid valve

•LP gas solenoid valve

•C om plete circuit on one P C B

•Connections for operation and fault dis-

play as w ell as rem ote unlock facility

•Rast 5 connectivity

Application

Th e a utom atic g as b urne r co ntrol

D G A I.69F is suitable for igniting and m on-

itoring gas burners w ithout blow er as per

EN 297 for interm ittent operation.

The D G A I.69F operates d uring heat re-

quest w ith perm anently burning ignition

burner at a heat capacity of

< 250 W and is therefore sp ecially suited

for gas b urners w hose m ain flam es need

not be m onitored constantly according to

the ionisation principle.

Approvals

EC type test ap proval as per EC G as

A ppliance D irective:

D G AI.69F C E-0085 A R 0403

EC type test ap proval as p er EC Pressure

Equipm ent D irective:

D G A I.69F C E0036

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Automatic gas burner controlDGAI.69FThe autom atic g as b urner control

m ounted on a PC B operates w ith elec-

tronic tim ers.

Therefore exact sw itching tim es are

ensured during voltag e and tem pera-

ture fluctuations or very short sw itch-

ing cycles.

The D G A I.69F com prises:

•controller for program flow

•flam e m onitoring op erating accord-

ing to the ionisation principle

•exhaust gas m onitor and exhaust gas

sensor (N TC resistor) or 1 M Ω resistor

instead of exhaust gas sensor.

Functional descriptionO n receipt of a heat req uest from the

regulator, the LP G pre-valve opens.

A fter a startup delay p eriod of ab out

10 s during w hich startup self-m onitor-

ing is p erform ed internally, the ignitionstarts and the ignition gas valve opens.

The ignition is sw itched off by the igni-

tion flam e signal, and sw itches over to

the so-called stabilising period during

w hich the ignition flam e m ust burn

properly.

Functional / circuit diagram DGAI.69F

Wiring diagram DGAI. 69F

A W Exhaust gas sw itch

A S Exhaust gas sensor

B O peration

FE Rem ote unlock facility

G D W G as p ressure sw itch

St 2 External fault

Y1 Ignition gas solenoid valve

Y 2 M ain g as solenoid valve

ZT Ignition facility

ZE Ignition electrode

IE onisation electrode

LPG LP gas valve

P E-B B urner g round

R R egulator

St Fault

N

L 1

St 6 , 3

A ,

t r

~ ( A C ) 5 0 H z 2 3 0 V

Y 2GDW FE

R

IE

Y 1LPG

ZE

ZT

AW

BSt 2

AS

162

1 2

X3

41 34 111 41a

1 2 3 4 5 6 7 8

X1

50 35 36 54 11

1 2 3 4 5

N N

6 7

N

8 9

N

10

X2

If the ignition flam e goes out w ithin the

stabilising period, the ignition cuts in

ag ain im m ediately.

A fter the stabilising period, the m ain

gas valve is opened provided that the

flam e is present.

The ignition flam e rem ains connected

during the com plete burner op eration

period .

In the case of flam e failure during

op eration, the m ain gas valve is closed

w ithin 1 s and a re-ignition attem pt is

perform ed im m ed iately.

W hen the regulator is sw itched off, the

LP G , ignition and m ain g as valves are

sw itched off.

O n receipt of a flam e signal before fuel

release, startup is b locked.

W hen exhaust gas flow s from the flow

p rotection relay, the e q uip m ent

sw itches off and this is follow ed by anexhaust gas d elay p eriod .

Exhaust gas switch as per EN 297/VP100A heat sensor (N TC resistor) m onitors

the tem perature at the draft interrupt-

er. In case of irregular exhaust gas

outlet the exhaust gas m onitor sw itch-

es off at approx. 65°C . A fter sw itch-off

by the exhaust gas m onitor, a tim er is

activated. Its tim e sequence starts

w hen the exhaust gas sensor cools

dow n to below 55°C .

The tim e sequence is approx. 15 m in.,

the burner rem ains blocked even after

the exhaust gas sensor has cooled

dow n until the tim e sequence is term i-

nated.

The exhaust gas sensor and its lines

are m onitored for interruption. A short

circuit also leads to sw itch-off in the

sam e w ay as excessive tem perature.

The D G AI.69F therefore operates only

w ith the exhaust gas sensor connected

or an appropriate spare resistor (1Ω).

50 Hz 230 V ACRemoteunlock

facility

F a u l t l a m p

L1 N

FW

FWZRHR

HR

Y 2

AmpliferFW

Z E

HRSTR

STR

I E

PE L P - G a s -

v a l v e

Regulator

GDW

F1

FW

ZRTimerSZA

ZR

Y 1

Gas solenoid valvesIgnition gas Main gas

H e a t r e q u e s t s i g n a l

N E x t e r n a l o p e r a t i o n

N

Ignition

Ignitionburner

Main burner

E x t e r n a l f a u l t l a m p

N

AW

AW

ASNTC

Exhaust

gasswitch

X3/1 X3/2 X1/6 X1/3 X1/4X1/5 X2/3 X1/1 X1/2 X2/2 X2/1 X2/10 X1/7X2/9 X2/8 X2/5 X2/4 X2/7 X2/6 X1/8

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