Worcester Greenstar 12i System Instruction Manual page 47

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REPLACEMENT OF PARTS
The following components require
t he air
I
gas manifold and fan
assembly to be removed:
Pressure switch
Fan
Electrode assembly
Burner
Heat exchanger
IMPORTANT: IF THE JOINT
BETWEEN THE AIR/GAS MANIFOLD
AND THE HEAT EXCHANGER I S
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·
PETE NT IN ITS USE.
13. Air
I
gas manifold and fan
assembly
• Remove electrical connector from
fan.
• Remove wire clip from gas valve outlet then
poll gas adjustment assembly free from plastic
connector
8Jld pull dear
otc:ase. See 6.1.
13.1
Undo
and
ft:!mO\f() securing nut (A)
from the
top ot the heat exchanger.
13.2 'Rem<we retaining plate (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 ffom boiler.
14. Pressure switch
14,1 Remove electrical connections (C).
14.2 Slacken top retaining screw and remove
bottom screw. (0).
14.3 Remove tube (E).
14.4 Remove 2 screws (F) retaining pressure
switch to brackel
• Refit nGw
pfQSSure
switch
to
bmckGl
IMPORTANT: ENSURE TUBE I S
REFITTED TO PRESSURE SWITCH
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.; "NOTE: some earlier appliances have a viewing
mirrOI' which indudes the. fetaining platQ.
IH$fi«..JifllN 6 SEIMOtiG lNSTRVCTlONS FOR WORCESTER GAttNStNI I 21 S,~ S,llcll
8716112055a(C410G}
REPLACEMENT O F PARTS