UK
48
Combustion head maintenance should
be made as follows:
- Unscrew the screw and remove the
cover.
- Unscrew the component holder plate
screws and hang the plate into the
service position.
- To gain access to the draught tube
and to the electrodes, remove the pin
6 and the screw 7, loosen locknut 8
and screw down the screw 9.
M
FAULT-FINDING CHART
FAULT
CAUSE
REMEDY
The burner does not start-up
No electricity
Check the main fuses.
Check the control box fuse.
Check thermostats line and gas
pressure switch.
Gas fails to reach the burner
Check that the interception de-
vices positioned along the feed
pipe open properly.
The burner starts, there is no
flame formation, then it locks
out
Gas valves do not open
Check valves operation.
There is no spark between the
electrodes tips
Check ignition transformer ope-
ration, check the electrode tips
position.
Air pressure switch does not
give its enabling signal
Check the calibration and the
operation of the air pressure
switch.
The burner starts, there is fla-
me formation, then it locks out
The control electrode either fails
to detect the presence of the fl
ame or it does so inadequately
Check the control electrode
position.
Check ionization current level.
Содержание EM 35-E
Страница 95: ......
