518
Thermo E+ 120/200/320
5 Troubleshooting
•
Reconnect the heater with the vehicle electrical
system.
•
Start DTT diagnosis, establish connection to the
heater and open the Component Test menu.
•
In the Component Test menu, select the solenoid
valve and start the test.
•
The solenoid valve must audibly open.
•
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.
•
).
The electrical function of the solenoid valve may be also
checked manually.
Manual check:
•
Remove burner (see
•
Unplug the solenoid valve connector from the control
device.
•
Check electrical function by applying DC voltage:
The solenoid valve must audibly open when the
DC voltage is applied.
•
Reconnect the solenoid valve connector to the control
device.
•
).
5.6.11 Nozzle block preheater inspection
For nozzle block preheating description, see
.
ATTENTION:
There are 2 versions of the nozzle block preheater
heating element (see
).
The heating element of the nozzle block preheater can
heat up during inspection.
Do not pull heating element out of the nozzle holder
during inspection.
NOTE:
At a temperature below 0°C ±4°C the thermostat switches
the heating element on. The heating duration depends on
the temperature of the intake air and the heat reflection
from the combustion space. Above 8°C ±3°C the ther-
mostat switches off.
Inspection using the DTT diagnosis
•
).
•
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, establish connection to the
heater and open the Component Test menu.
•
In the menu Component Test select the BM/NPH and
proceed according to the instructions of the DTT
diagnosis.
Enter runtime and then start the component test.
In order to heat up the heating element, a temperature
below 0°C ±4°C must be applied to the thermostat.
Caution: At the same time the burner motor is started
too.
Nominal condition: The heating element warms up.
•
After test completion, terminate DTT diagnosis as
needed.
Inadvertent operation of the removed burner can
cause severe burn injuries. If the burner and heat ex-
changer are separated, do not connect the temperatu-
re sensor to the control unit.
•
Disconnect the heater from the vehicle electrical
system (
Observe
!).
•
Remove the DTT diagnosis adapter wiring harness as
required.
•
Reinstall burner (see
24V
12V
Opening voltage [V]
ab 17.0
8.5
Power consumption at
20°C [W]
9
9
Nominal current [A]
0.37
0.75
Risk of burns!
Caution!
Danger of severe burn
injuries!
Warning!
Содержание Thermo E+ 120
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