Valeo spheros thermo 230 Workshop Manual Download

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908

Thermo 230 / 231 / 300 / 301 / 350

9 Repair

9.2.5 Control Unit, Replacement

NOTE:

For replacement of the control unit the burner head
may be left installed and must only be swung open for
disconnection of electrical connector (8,

Fig. 904

In removed condition ensure that igniter electrodes are
not bent and nozzle is not damaged.
If a control unit 1572 is substituted with a control unit
1572D, perform procedure according to

9.1.2.1

9.2.5.1 Removal

1. Disconnect all electrical connections from control unit

(23,

Fig. 904

2. Swing burner head open (refer to

8.5.2

) and

disconnect electrical connector (8).

3. Remove flame sensor (refer to

9.2.9.1

4. Remove combustion air fan (refer to

9.2.4.1

5. Carefully withdraw control unit (23) in axial direction

from burner head (17) and remove.

6. Perform procedures on components after

disassembly (refer to

9.1.1

9.2.5.2 Installation

1. Carefully push control unit (23,

Fig. 904

) in axial

direction against stop into burner head (17).

2. Install combustion air fan (refer to

9.2.4.2

3. Make all electrical connections on control unit (23).
4. Install flame sensor (refer to

9.2.9.2

5. Connect electrical connector (8).

9.2.6 Fuel Pump, Replacement

9.2.6.1 Removal

1. Remove burner (refer to

9.2.3.1

2. Using screwdriver lever off igniter electrodes

(3,

Fig. 904

) from igniter box (1) and remove.

3. Remove disc (6) with heating cartridge (if installed).
4. Disconnect electrical connector (8).

NOTE:

During the following step ensure that escaping fuel is
immediately neutralized and properly disposed of.

5. Remove screws (9) and discard.
6. Withdraw fuel pump (10) together with solenoid valve

(7) and remove.

7. Remove and discard O-rings (12) and filter screen

(11).

8. Remove solenoid valve (7) from fuel pump (10) as

required.

9. Perform procedures on components after

disassembly (refer to

9.1.1

9.2.6.2 Installation

1. Install solenoid valve (7,

Fig. 904

) on fuel pump (10)

if required.

2. Fit new O-rings (12) and filter screen (11) on fuel

pump (10).

3. Position fuel pump (10) for installation and secure

with new screws (9) (with threadlock coating).

4. Tighten screws.
5. Connect electrical connector (8).
6. Plug on disk (6) and mount heating cartridge.
7. Plug on igniter electrodes (3).
8. Install burner (refer to

9.2.3.2

9.2.7 High Pressure Nozzle, Replacement

9.2.7.1 Removal

1. Remove burner (refer to

9.2.3.1

2. Using screwdriver lever off igniter electrodes (3,

Fig.

904

) from igniter box (1) and remove.

3. Remove disk (6) with heating cartridge (if installed).
4. Disconnect electrical connector (8) of the heating

cartridge.

5. Unscrew high pressure nozzle (4).

NOTE:

Ensure cleanliness is maintained when installing the
nozzle. Only touch the nozzle at its hexagon surface.

9.2.7.2 Installation

1. Screw in high pressure nozzle (4,

Fig. 904

) and

tighten.

2. Connect electrical connector (8) of the heating

cartridge.

3. Plug on disk (6) and mount heating cartridge.
4. Plug on igniter electrodes (3).
5. Install burner (refer to

9.2.3.2

9.2.8 Igniter Box, Replacement

The igniter box operates with high voltage. Prior to
opening the burner head the connectors of the cable
harness in the vehicle have to be disconnected to
prevent lethal injuries.

High voltage!

Danger to life!

Warning!