Bosch Appliances 24I RSF manual Conversion Instructions, Gauze Filter

20. Control Board.

Check that the electricity supply to the appliance is turned off. Undo the 3 screws and remove the facia bottom panel.

Remove the two upper screws and hinge down the facia assembly.

Carefully pull off all the connectors. Disconnect the mains supply lead at terminal X1 and the earth connection at the back. Remove the four corner screws on the back of the facia and separate the metal back panel from the plastic facia.

Remove and retain the brass nut and washer.

Release the six pillars on the control board and pull the control board forward off the back panel.

Fit the replacement board in the reverse order ensuring it is pushed firmly onto the six pillars and clicks into place. Special care should be taken with the brass post and nut to ensure a good earth contact. (Check earth continuity between the incoming earth and the appliance chassis).

Refit the facia panel and hinge the control box assembly in the servicing position as described in Section 14.3 (c).

21. Gauze filter. See Fig. 37.

Remove the water flow switch as described in section 15.4-17. Undo the lower union nut on flow switch housing.

Undo the nut on the isolating valve and remove the mains water inlet pipe. Carefully extract the filter from the valve end of the pipe.

Replace the filter and refit the pipe in reverse order.

22. Flue flow sensor. See Fig. 38.

Check that the electricity supply to the appliance is turned off. Remove the fan assembly as described in Section 14.3(e). Unscrew the single central retaining screw and withdraw the sensor from the fan.

Fit the new sensor ensuring the correct orientation and carefully tighten the retaining screw.

Refit the fan assembly in reverse order.

Fig. 37. Gauze Filter.

Gauze Filter Isolating Valve

Fig. 38. Flue flow sensor.

Positive

16. Conversion Instructions

These instructions should be used when converting appli- ances from natural gas to LPG and vice versa.

Only components supplied by Worcester Heat Systems should be used.

Only competent persons should attempt the conversion. Conversion from Natural Gas to LPG should not be carried out on appliances installed in a room or inter- nal space below ground level.

1.Ensure the gas service cock is turned OFF and the elec- trical supply is isolated.

2.Refer to section 14.3 Dismantle the Appliance to remove the boiler front panel and inner casing. Follow the dismantling instructions to remove the burner.

3.Remove the injector and replace with the injector from the kit.

4.Remove the nut, end cap and bracket from the end of the burner.

4.1For conversion to Natural gas remove the internal

gauze.

4.2For conversion to LPG fit the gauze into the burner

body.

5.Refit the end cap ensuring the bracket is in the correct orientation.

6.Refit the burner to the appliance and re-assemble the inner casing.

7.Follow the dismantling instructions to remove the gas valve and refit the new valve. See Installation Instructions: Section 15.4.11 Replacement of Parts, Component Replacement, Gas Valve.

8.Turn on the gas and electricity supplies and following the commissioning procedure confirm gas soundness and correct boiler operation.

9.Set the gas pressure to the required rate for the new gas type as specified on the data plate. When this is done refit the cap to the adjuster and seal its retaining screw with paint or nail varnish.

10.Turn off the boiler and when cool peel off the arrow from the data plate and re-stick it against the gas type for which the appliance is now converted.

11.Replace the boiler front panel.

The conversion is now complete.

Parts List

Item No.	Description	Natural Gas to LPG Kit	LPG to Natural Gas Kit
		7 716 192 131	7 716 192 132
1.	Burner Injector	8 716 140 209	8 716 140 224
		Stereomatic 2.78mm	Stereomatic 4.3mm
2.	Burner Gauze	8 716 142 601	Remove Gauze
3.	Gas Valve	8 716 142 430	8 716 142 413

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