PART IV: MAINTENANCE
37
Replacing the detection electrode (if provided)
To replace the ignition electrodes, proceed as follows:
1
remove the burner cover
2
disconnect the electrodes cables (
CR
);
3
loose the screw of the electrodes support (
VR
);
4
remove the electrodes and replace them paying attention to the measures shown in
figure.
Checking the detection current with electrode (natural gas) (versione LME / LGK)
To check the detection signal follow the scheme in the picture below. If the signal is less than the value indicated, check the position of
the detection electrode or detector, the electrical contacts and, if necessary, replace the electrode or the detector.
Checking the detection current with photocell (LME) (L.P.G.)
To check the detection signal follow the scheme in the picture below. If the signal is less than the value indicated, check the position of
the detection electrode or detector, the electrical contacts and, if necessary, replace the electrode or the detector.
ATTENTION:
avoid
the ignition electrodes to contact metallic parts (blast tube, head, etc.), otherwise the boiler’s operation
would be compromised. Check the electrodes position after any intervention on the combustion head.
CR
VR
Detection electrode
Connector
µA DC SCALE
*
Detection electrode
Flame
LME: 1
LGK: 24
*
Control box
Minimum detection signal
Siemens LME21-22
3 µA
LGK
12 µA
Control box
Minimum detection signal
Siemens LME21-22
200 µA
LGK16
12 µA
:
GP/SB
R/W
N
QRA...
br
rt
sw
AGQ3...
sw
br
bl rt
sw
AGQ3...
sw
bl
QR
A
Содержание C85A
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Страница 53: ...FRONTALE QUADRO FRONT CONTROL PANEL ...
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