13.1 REPLACEMENT OF PARTS

A

The following components require the air / gas manifold and fan assembly to be removed:

Pressure switch Fan

Electrode assembly Burner

Heat exchanger

13.2

B

13.3

IMPORTANT: IF THE JOINT BETWEEN THE AIR/GAS MANIFOLD AND THE HEAT EXCHANGER IS DISTURBED THE SEALING GASKET MUST BE REPLACED.

IMPORTANT: AFTER REASSEMBLY THE COMBUSTION MUST BE CHECKED USING THE PROCE- DURE IN THE SECTION “SETTING THE GAS AIR RATIO”. MEASURE- MENT AND SETTING (IF NECES- SARY) OF THE GAS RATIO MUST NOT BE ATTEMPTED UNLESS THE PERSON IS EQUIPPED WITH A COMBUSTION ANALYSER CON- FORMING TO BS 7927 AND IS COM-

PETENT IN ITS USE.

SERVICING

& SPARES

13. Air / gas manifold and fan

assembly

 

Remove electrical connector from fan.

 

Remove wire clip from gas valve outlet then

 

pull gas adjustment assembly free from

 

plastic connector and pull clear of case

 

(see 6.1).

13.1

Undo and remove securing nut (A) from the

 

top of the heat exchanger.

13.2

Remove stainless steel viewing mirror (B).

13.3

Rotate fan and air/gas manifold assembly

 

(shaded) around the top of the heat

 

exchanger until the lug on the air/gas

14.4

manifold is visible.

Lift up assembly and remove from boiler.

14. Pressure switch

14.1

Remove electrical connections (C).

14.2

Slacken top retaining screw and remove

F

bottom screw. (D).

 

14.3

Remove tube (E).

14.4

Remove 2 screws (F) retaining pressure

 

switch to bracket.

 

Refit new pressure switch to bracket.

IMPORTANT: ENSURE TUBE IS

REFITTED TO PRESSURE SWITCH

14.1 14.2 14.3

E

D

C

45

REPLACEMENT OF PARTS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior 8 716 107 336b (11/05)

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Image 46
Bosch Appliances 28i junior, 24i junior manual 13.2 13.3, 14.4, 14.2

28i junior, 24i junior specifications

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