Worcester GREENSTAR 12Ri Instruction Manual page 46

13.1
C
44
REPLACEMENT OF PARTS
13.2
D
REPLACEMENT OF PARTS
12.1
A
The following components require
the air / gas manifold and fan
assembly to be removed:
Pressure switch
Fan
Electrode assembly
Burner
Heat exchanger
12.2 I M P ORTANT:
BETWEEN THE AIR/GAS MANIFOLD
AN D TH E H EAT E XCHANG E R I S
B
DISTURBED THE SEALING GASKET
MUST BE REPLACED.
IMPORTANT:
AFTER RE-ASSEMBLY THE COM-
B USTION M UST B E CH ECK E D
USING THE PROCEDURE IN THE
SECTION "SETTING THE AIR/GAS
RATIO". MEASUREMENT AND SET-
TI NG OF TH E GAS RATIO M UST
12.3
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.
12. Air / gas manifold and fan
12.1 Undo and remove securing nut (A) from the
12.2 *Remove retaining plate (B).
12.3 Rotate fan and air/gas manifold assembly
13.4
NOTE:
F
I M PORTANT: E N S U R E TU B E I S
REFITTED TO PRESSURE SWITCH
13. Pressure switch
13.1 Remove electrical connections (C).
13.2 Slacken top retaining screw and remove
13.3
13.3 Remove tube (E).
13.4 Remove 2 screws (F) retaining pressure
E
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR Ri
I F TH E
assembly
Isolate the gas and electrical supplies.
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.
top of the heat exchanger.
(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.
After re-assembly, check CO/CO
levels as described in the setting of the
air/gas ratio section.
bottom screw. (D).
switch to bracket.
Refit new pressure switch to bracket.
NOTE:
After re-assembly, check CO/CO
levels as described in the setting of the
air/gas ratio section.
8 716 115 168a (06/2008)
JOI NT
2
2