Bosch GREENSTAR 24i junior - Manual (Page 46)

REPLACEMENT OF PARTS
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
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
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.
The following components require
the air / gas manifold and fan
assembly to be removed:
Pressure switch
Fan
Electrode assembly
Burner
Heat exchanger
13.1
13.2
14.4
14.3 14.2 14.1
A
B
C
D
E
F
13.3
I M P ORTANT: I F TH E JOI NT
BETWEEN THE AIR/GAS MANIFOLD
AN D TH E H EAT E XCHANG E R I S
DISTURBED THE SEALING GASKET
MUST BE REPLACED.
I M P ORTANT: E N S U R E TU B E I S
REFITTED TO PRESSURE SWITCH
IMPORTANT: AFTER REASSEMBLY
TH E C OM B USTION M UST B E
CH ECK E D US I NG TH E P RO CE-
DURE IN THE SECTION “SETTING
TH E GAS AI R RATIO”. M EAS U R E-
M E NT AN D S ETTI NG (I F N ECE S-
SARY) OF TH E GAS RATIO M UST
NOT BE ATTEMPTED UNLESS THE
P E R SON I S EQU I P P E D W ITH A
C OM B USTION ANALYS E R C ON-
FORMING TO BS 7927 AND IS COM-
PETENT IN ITS USE.
REPLACEMENT OF PARTS INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 107 336b (11/05)
45
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