GB-4
GB
Maintenance
Replacing the UV tube
The UV tube in the UV sensor must be replaced
after approx. 10,000 operating hours (approx.
1year) as its service life has expired (see “Ac-
cessories”).
1 Disconnect the system from the electrical power
supply.
2 Shut off the gas supply.
Do not touch the new UV tube with bare fingers.
4 5
6
3
7
Cleaning or replacing the quartz glass disc
4
5 Follow the reverse procedure when reassembling.
For a quartz glass lens, ensure that the lens cur-
vature points towards the flame.
Assistance in the event of
malfunction
WARNING
– Electric shocks can be fatal! Before working
on possible live components ensure the unit is
disconnected from the power supply!
– Fault-clearance must only be undertaken by
authorised, trained personnel!
– Unauthorised repairs on the UV sensor will
cancel our guarantee. Unauthorised repairs or
incorrect electrical connections can cause the
UV sensor to become defective. In this case
fail-safe operation can no longer be guaranteed!
– (Remote) resets may only be conducted by au-
thorised personnel with continuous monitoring
of the burner to be repaired.
– Safe operation only in conjunction with Elster
Kromschröder automatic burner control units,
flame detectors or burner control units.
• Measure the current in the flame signal cable (con-
nect the positive pole of the measuring instrument
to the cable from the automatic burner control
unit and the negative pole to the cable from the
UV sensor).
The measured direct current must be greater than
1µA (typically 20µA).
UVS
1
2
3
PE
–
+
µA
Signal
? Fault
! Cause
• Remedy
Possible faults and suggested solutions
? A direct current is flowing, but no flame present.
! The UV sensor is influenced by the flames of other
burners, e.g. by reflection on the furnace walls.
• Position the sensor so that it can only “view” its
own dedicated flame (e.g. use viewing tube).
! Humidity inside the sensor.
• Vent sensor.
! The service life of the UV sensor has expired.
• Replace UV tube in the UV sensor (see “Mainte-
nance”).
! The sensitivity of the flame amplifier in the auto-
matic burner control unit is too high.
• Adjust switching threshold on automatic burner
control units with adjustable switch-off threshold.
Tighten the
screw firmly.
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