Igniter Box Check; Fuel Pump Check; Fuel Pump Check On Heaters With Control Unit 1572 - Webasto Thermo 230 Workshop Manual

Thermo 230 / 300 / 350

6.3.4 Igniter Box Check

The igniter box may also be tested using the PC heater
diagnosis (component test).
WARNING
High voltage; 20.000 volts arcing across the igniter
electrodes.
CAUTION
Do not apply voltage to igniter box without electrodes.
Check
– apply 24V as shown on figure
– normal condition: spark between electrodes.
NOTE
Igniter box (black
connector cover)
only in combination
with control unit
1572
NOTE
Igniter box
(green connector cover;
mechanically coded)
in combination with
control unit
1572D and
also with
control unit
1572
NOTE
Igniter electrodes 20.000 V
Igniter electrodes 20.000 V
6 Functional Checkouts

6.3.5 Fuel Pump Check

6.3.5.1 Fuel Pump Check on Heaters with Control Unit
1572
Fuel pump testing is performed with fuel pump installed.
Fuel pump pressure setting is not allowed; replace pump
if required.
For fuel pump testing a tester must be locally manu-
factured. For this purpose a pressure gauge may be used
soldered onto a used nozzle (range of indication 0 to 15
bar).
CAUTION
Remove igniter box.
Check
– remove igniter box (refer to 9.2.7.1).
– remove nozzle.
– screw on tester.
– cover flame sensor.
– switch on heater.
– after approximately 13 sec. pump pressure is
indicated (refer to diagram).
– switch off heater.
– unscrew tester.
CAUTION
Do not damage nozzle bore.
– screw in nozzle and torque with 20 Nm.
– install igniter box (refer to 9.2.7.2).
11
10,5
10
9,5
9
8,5
Thermo 230
8
2500 3000 4000
Speed (min
Pump pressure in relation to speed
NOTE
Thermo 350
Thermo 300
5000 6000 7000
-1
)
8000 8500
603