Spheros thermo 231, Workshop Manual

Page: 37 / 98

Thermo 230 / 231 / 300 / 301 / 350 6 Functional Checkouts
603
6.3.4 Igniter Box Check
NOTE
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 24 V as shown on figure
– normal condition: spark between electrodes.
6.3.5 Fuel Pump Check
6.3.5.1 Fuel Pump Check on Heaters with Control Unit
1572
A test gauge is required for performing the test. Such a
gauge (with a range from 0 to 15 bar) can be procured
from your authorized
Spheros
dealer.
The fuel pump and the fuel hoses must be replaced every
5 years.
CAUTION
The electronic ignition coil must be removed for safety
reasons.
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).
Igniter electrodes 20.000 V
NOTE
Igniter box (black
connector cover)
only in combination
with control unit
1572
Igniter electrodes 20.000 V
NOTE
Igniter box
(green connector cover;
mechanically coded)
in combination with
control unit
1572D and
also with
control unit
1572
2500 3000
8
8,5
9
9,5
10
10,5
11
4000 5000 6000 7000 8000 8500
Thermo 350
Thermo 300/301
Thermo 230/231
Speed (min
-1
)
Pump pressure in relation to speed
Pu
m
p p
re
ssu
re
(b
a
r)