515
Thermo E+ 120/200/320
5 Troubleshooting
5.6.7.1 Ignition electrodes inspection
For ignition electrodes description, see
.
Inspection
•
Remove burner (see
ATTENTION:
Do not touch the nozzle opening during the test!
When readjusting the ignition electrodes, make
sure that no torque is introduced into the interior
of the ignition spark generator.
To do this, hold the electrode to be adjusted at the
housing outlet with a pair of pliers and carefully
bend it with another pair of pliers.
•
Check clear distance of the electrode tip to the fuel
nozzle (see
) and adjust if necessary.
•
Check the clear distance between the electrodes
(see
) and adjust if necessary.
You can use the gauge 310646Z to check / adjust the igni-
tion electrodes.
5.6.8 Flame guard inspection
For flame guard description, see
Visual inspection
•
Check correct arrangement of dust protection tube
and spring between control device and disc.
The dust protection tube must rest on the opening of
the flame guard in the burner housing and engage into
the burner housing.
The electronic part of the flame guard is permanently
integrated into the control device and cannot be replaced.
The functional test is done using the DTT diagnosis.
If damaged or if the target value is not reached the control
device is to be replaced as required.
Inspection
•
).
•
Connect the DTT diagnosis to the heater using the
adapter wiring harness (ref. to Operating Instructions
for the DTT diagnosis).
•
Reconnect the heater with the vehicle electrical
system.
•
Start DTT diagnosis and establish connection to the
heater.
•
Cover the opening of the dust protection tube.
Check the flame guard voltage displayed on a PC by
the DTT diagnosis (target value: U = 4.01V ... > 5.0V).
•
Remove the cover from the opening of the dust
protection tube and illuminate it from close distance
using a bright lamp.
Check the flame guard voltage displayed on a PC by
the DTT diagnosis (target value: U = 0.13V ... 2.5V).
•
•
After test completion, terminate DTT diagnosis as
needed.
•
Disconnect the heater from the vehicle electrical
system (
Observe
!).
•
Remove the DTT diagnosis adapter wiring harness as
required.
•
Reinstall burner (see
Fig.506
4
5
8
± 0,5
± 0,5
+ 1
Summary of Contents for Thermo E+ 120
Page 64: ...memos...
