Valeo spheros thermo 230, Руководство по ремонту

Страница: 31 / 71

603
Thermo 230 / 231 / 300 / 301 / 350 6 Functional Checkouts
6.3.5 Fuel Pump Check
6.3.5.1 Fuel Pump Check on Heaters with Control Unit
1572
A pressure test gauge with a display range from 0 to 15
bar as well as a bleeding feature is required (see Fig.
below). The pressure test gauge can be obtained from a
Spheros Service Center or a distribution partner.
As prescribed, the fuel pump and the fuel hoses must be
replaced every 5 years.
ATTENTION:
The igniter box must be removed for safety reasons.
Check
– remove igniter box (refer to 9.2.8.1 ).
– remove nozzle.
– screw on test gauge.
– cover flame sensor.
– switch on heater.
– Open the bleed port at the pressure test gauge until
some fuel escapes, collect it e.g. with a cloth. Close
the bleed port and read the present pressure at the
gauge.
– after approximately 13 sec. pump pressure is
indicated (refer to diagram).
– If the specified pressure cannot be reached, it can be
readjusted. For that rotate the adjusting screw (see
Fig. below) max. one revolution. If the prescribed
pressure despite readjustment not be achieved or
occur leaks, the fuel pump must be replaced.
– switch off heater.
– unscrew test gauge.
ATTENTION:
Do not tuch or damage nozzle bore.
– Screw in nozzle and tighten (see 9.2.7.2 ).
– Install igniter box (refer to 9.2.8.2 ).
6.3.5.2 Fuel Pump Check on Heaters with
Control Unit 1572D
NOTE:
The fuel pump check of heaters with control unit 1572D
can also be done using the PC heater diagnosis in the
menu component test.
As prescribed, the fuel pump and the fuel hoses must be
replaced every 5 years.
Check
– remove nozzle.
Pump pressure test gauge
with bleeding feature
2500 3000
8
8,5
9
9,5
10
10,5
11
4000 5000 6000 7000 8000 8500
Thermo 350
Thermo 300
Thermo 230
Speed (min
-1
)
Pump pressure in relation to speed
Pu
m
p pr
es
su
re
(b
a
r)
Adjustment screw
pump pressure
Note: Pump displayed when removed.