Bosch 15SBI Service Manual download pdf (Page 24)

15.4.1 Gas Valve

Do not remove the inner casing.

Unscrew the fixing screw and unplug the connections.

Remove the air pressure switch. refer to section 15.4.19.

Unscrew the union connections above and below the gas valve,

unscrew the mounting bracket and remove the assembly. Use

new gaskets when replacing the valve. Refer to Fig. 43.

Set the Gas Valve:

Connect a pressure gauge to the burner pressure test point on

the valve. Refer to Fig. 39.

Switch on the gas and electricity supplies. Check for gas

soundness at the gas valve inlet.

Refer to Section12-Commissioning for the method of checking

the pressures.

Check for gas soundness at the gas valve outlet.

Adjust the gas valve to obtain the required pressure.

Switch off the appliance, disconnect the pressure gauge and

tighten the test point screw. Refer to Fig. 43.

15.4.2 Spark Electrode

Remove the inner casing and the combustion chamber.

Lower the facia

Carefully pull off the leads at the electrodes. Loosen the screw

and remove the electrode assembly. Refer to Fig .44.

15.4.3 Flame Sense Electrode

Remove the inner casing and the combustion chamber.

Lower the f`acia.

Separate the in-line connector located in the controls

compartment. Remove the burner. Refer to Section 15.4.4.

Loosen the screw and remove the electrode assembly. Refer to

Fig.44. Ensure that the new electrode is at the correct height

above the burner blade.

15.4.4 Burner

Remove the inner casing and the combustion chamber.

Separate the flame sense electrode in-line connector located in

the controls compartment.

Release the union connection beneath the burner and remove

the burner from the appliance. Refer to Fig. 43 and 44.

Do not omit the gasket when fitting the new burner.

Fig.44 . Burner and Electrode

3-4mm

5-6mm

Spark

electrode

assembly

Spark electrode

detail

Flame

sensor

position

Flame sensor

detail

Burner injector

Burner

fixing nut

Fig.43 . Lower Casing - Gas and Water

Controls.

1. Pump

2. Flow manifold

3. Filling Loop

4. Air pressure switch

5. Gas Valve

6. Pressure relief valve

7. Connector

8. Bypass

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 36 37

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Bosch 15SBI Service Manual Page 24

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