Dungs DGAI. 69F Manuel - Page 3

Parcourez en ligne ou téléchargez le pdf Manuel pour {nom_de_la_catégorie} Dungs DGAI. 69F. Dungs DGAI. 69F 4 pages. Automatic gas burner control for gas burners without fan, with intermittent ignition burner and exhaust gas monitoring

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Functional and program sequence

Startup after regulator circuit, with flame formation

AWZ

STABZ

Switch-off via exhaust gas temperature followed by startup

Exhaust gas

15 min

delay period

Restart after flame failure during operation

SZB

Startup after regulator circuit, without flame formation

SZA

STVZ

Program sequence periods

Startup delay period (AWZ)

Stabilising period (STABZ)

Safety period startup (SZA)

Safety period operation (SZB)

Fault interlocking period (STVZ)

Exhaust gas delay periodapprox. 15 min.

The SZB is < 3 s immediately after

main valve release and reduces to

< 1 s after an operation of approx. 30 s.

Ionisation flame monitor

An ionisation electrode acts as a probe

in the flame, the burner nozzle normal-

ly acts as ground.

Ensure that there is proper flame ad-

hesion to the burner.

The burner nozzle must be properly

connected to the opposite pole in the

ionisation current return line.

Under normal power supply condi-

tions, the opposite pole - N - is tied to

ground potential. Connection of

ground and/or protective grounding

terminal to burner ground is sufficient.

If a buffer transformer is used, it is

absolutely necessary that the burner

ground is connected to the pole which

is used instead of N. Otherwise the

ionisation current has no return line.

The situation may occur that, despite

a proper flame and proper arrange-

ment of the electrode, no or only a

weak ionisation current can flow.

3 ... 4

The material of the ionisation elec-

trode and the insulation must be heat-

resistant. A proven material is Kanthal

Regulator, gas switch

for electrodes and a ceramic insula-

Exhaust gas temperature

LP gas valve

tion made of aluminium oxide. The

Ignition

insulation resistance should be more

Ignition valve Y1

Flame signal

than 50 MΩ.

Main gas valve Y2

Fault interlock

Measuring the monitor current

The intensity of the ionisation current

Regulator, gas switch

Exhaust gas temperature

can be measured by means of a DC

LP gas valve

Ignition

micro-ammeter. The current intensity

Ignition valve Y1

should not undershoot 6 µA during

Flame signal

Main gas valve Y2

operation. The maximum reachable

Fault interlock

ionisation current is approx. 50 µA.

Fault shut-down takes place when the

Regulator, gas switch

ionisation current undershoots approx.

Exhaust gas temperature

1 µA.

LP gas valve

Ignition

For measurement purposes, the mi-

Ignition valve Y1

Flame signal

cro-ammeter is switched between the

Main gas valve Y2

Fault interlock

ionisation electrode and the connec-

tion plug.

Regulator, gas switch

Test equipment connection

Exhaust gas temperature

LP gas valve

Ignition

Ignition valve Y1

Flame signal

Main gas valve Y2

Ionisation

Fault interlock

100 µF

approx. 3 s

approx. 5 s

< 50 s

< 1 s

approx. 5 s

= 0...100 µA

Installation and operating instruc-

tions

Installation

The automatic gas burner control can

be installed in any position.

Electrical connection

Wiring has to be performed in compli-

ance with the local prevailing regula-

tions and the wiring diagram.

Startup

Before startup, check whether all con-

nections are correct.

Check the following safety functions

during startup:

1. Switch off regulators, switches and

limiters.

2. Refer to gas pressure switch switch-

ing points

3. Flame detector

Interrupt ionisation line and/or per-

form a short circuit between elec-

trode and ground.

4. Test: Switch-off via exhaust gas

temperature

DGAI.69F

Fault unlocking facility

In case of fault, the DGAI.65F is un-

locked by means of an external con-

tact.

Fuses

An internal fuse (4 A) protects the

equipment from an output-side short

circuit. The fuses cannot be replaced.

For this reason, only DUNGS person-

nel may check and repair the auto-

matic burner control.

External backup of the automatic gas

burner control by means of a 6.3 A

slow-blow and/or 10 A quick-acting

back-up fuse.

Refer to the permitted

switching capacities.

If a fuse is defective, check the

safety function of the monitoring

device, otherwise the contact may

be welded by a short circuit.

If you do not observe these

installation and operating

instructions, it may result in per-

sonal injury or material damage.

For this reason, strictly keep to the

instructions. The warranty for the

equipment will expire on any at-

tempt to access the electronic cir-

cuits, i.e. automatically when the

seal is broken.

The effects of leak search

spray and similar substanc-

es may cause dangerous flame-

simulating conditions on ionisa-

tion electrodes and conductors,

e.g. ionisation ammeters.

Therefore please handle leak

search sprays and similar sub-

stances with extreme care so that

they are only applied to the leak

test points.

If it is not possible to limit the use

of these substances, ionisation

electrodes and conductors must

be protected before applying the

substances. It is not sufficient to

merely wipe off the leak search

spray substance after application.