GB-8
D
GB
F
NL
I
E
ZTI 55
4
3
5
6
2
1
2 mm
Installer
une nouvelle
électrode
d’allumage.
Écart entre
l’électrode
d’allumage
et le bord
= 2 mm.
4
3
5
6
2
1
2 mm
Insert
new ignition
electrode.
Gap between
ignition
electrode and
edge = 2 mm.
ZT 40, ZTI 55
•
Follow the reverse procedure when reassembling.
▷
▷
Replace the seal between burner housing and
protective tube.
Maintenance
▷
▷
The system requires little servicing. Check the
safety time and the thermo-electric voltage once
a year.
▷
▷
Check safety time – see page 6 (Checking the
safety time).
Checking the thermo-electric voltage
When moving the air slide valve on the pilot burner
– see page 6 (Setting the gas/air mixture) – meas-
ure the thermo-electric voltage on the control
valve between the connections for the thermo-
cable and the grounding cable.
▷
▷
The thermo-electric voltage on the control valve
with respect to ground must be ≥ 10 mV.
▷
▷
If the thermo-electric voltage on the control valve
is < 10 mV – see page 8 (Faults).
Faults
DANGER
Electric shocks can be fatal! Before working on
possible live components, ensure the unit is discon-
nected from the power supply.
Fault-clearance must only be undertaken by author-
ized, trained personnel.
▷
▷
Faults may be cleared only using the measures
described below.
▷
▷
If the control valve or the pilot burner does not re-
spond even though all faults have been remedied:
remove the unit and return it to the manufacturer
for inspection.
? Faults
! Cause
• Remedy
?
The pilot flame is not burning.
!
No gas supply.
•
Check gas pipe.
!
No ignition spark.
•
Check the voltage supply to the ignition trans-
former.
•
Check the high-voltage line from the ignition trans-
former.
▷
▷
High-voltage line too long.
•
Check the distance to the ignition electrode.
▷
▷
Distance between burner ground and ignition
electrode = 2 ± 0.5 mm.
•
S11T..S: check the function of the ignition trans-
former switch.
▷
▷
Measure the voltage on the switch input and
output with respect to N.
!
Ignition electrode burnt off.
•
Replace the ignition electrode.
?
The pilot flame is too small or too large.
!
Gas and air pressures are too low or too high.
•
Correct the gas pressure.
▷
▷
For gas pressures ≥ 30 mbar, fit a gas restrictor
orifice upstream of the burner.
▷
▷
ZT 40 with forced air supply: check the air pres-
sure and correct if necessary. Fit an air restrictor
orifice.
•
Adjust the air slide valve – see page 6 (Setting the
gas/air mixture).
!
The thermo-electric voltage is too low.
•
When moving the air slide valve on the pilot
burner, measure the thermo-electric voltage on
the control valve between the connections for the
thermo-cable and the grounding cable.
▷
▷
The thermo-electric voltage on the control valve
with respect to ground must be ≥ 10 mV.
!
The thermocouple is burnt.
•
Replace the thermocouple – see page 7 (Replacing
the thermocouple).
