Cuenod C 100 B 517, Operating Instructions Manual, Page: 47 / 52

47
0306 / 13 013 497A
Gas maintenance
•
Check the following if failure occurs:
–
power supply (power and control),
–
fuel supply (valve pressure and
opening),
–
control components,
–
switch positions on TC control
panel.
If problem persists:
•
Check various program symbols
described here below on the control
and safety unit.
Safety components must not be
repaired but replaced by similar items.
m
Only use
manufacturer spare parts.
Note
After each operation:
•
Check combustion and all circuits
for possible leaks.
•
Perform safety checks.
•
Record results in the relevant
documents.
Symbol Fault Cause Corrective action
w
Burner stops in position.
nothing happens. Insufficient gas pressure. Adjust distribution pressure.
Clean filter.
Normal gas pressure. Misadjusted or faulty gas pressure switch.
Closed gas pressure switch (welded
contact). Adjust or replace gas pressure switch.
Replace air pressure switch.
With leakage test. Leak test unit lockout.
Leak test unit power of.f Unlock or change valve.
Check, change fuse.
w
Burner on safety lockout.
in position Parasitic flame on thermostatic cut-off. Check gas valve air-tightness.
Fit a postventilation device.
P
in “ P ” position
Motor not working. Contactor is open. Faulty air pressure.
Thermal relay cut out.
Faulty contactor. Replace air pressure switch.
Reset, adjust or change thermal relay.
Change contactor.
Motor not working.
Contactor closed. Faulty wiring between contactor and motor
Faulty motor.
Check wiring.
Replace motor.
z
1
Motor working.
in position
in “ 1 ” position
No ignition arc
Misadjusted or faulty air pressure switch.
Faulty flame monitoring circuit.
Ignition electrode(s) short-circuiting.
Damaged ignition cable(s).
Faulty ignition transformer.
Control and safety unit.
Adjust or replace air pressure switch.
Check pressure pipes.
Check cell.
Change control and safety unit.
Adjust or replace electrodes.
Replace ignition cables.
Replace ignition transformer.
Change control unit.
Electromagnetic valves not opening Electrical connections broken.
Coil(s) short-circuiting.
Mechanical jamming in valves or
proportional regulator.
Check wiring between unit, servomotor and
valve.
Change coil(s).
Change valve.
Combustion head.
Flame appears, but is unstable or goes
out (insufficient cell current).
Misadjusted combustion head.
Air flap too open and/or gas flow too high.
Adjust combustion head.
Adjust air flap or gas flow rate.
I
x
v
Burner on continuous ventilation but no
flame.
in “ I ” position
on
or
on
Faulty servomotor.
Mechanical jamming of air flap.
Faulty mechanical coupling. Adjust or change servomotor.
Unblock air flap.
Check or change coupling.
Other incidents
Sudden lockout at any time, not
indicated by any symbol.
Control and safety unit recycle without
safety lockout.
Premature flame signal.
Old cell.
Misadjusted or faulty gas pressure switch.
Change control and safety unit.
Change cell.
Adjust or replace gas pressure switch.
EN