Worcester Greenstar 12i System Instruction Manual page 54

THIS PAGE SHOWS THE SEmNG PROCEDUR E FOR THE SIT VALVE
FOR ALTERNATIVE VALVES SEE PAGE 52 FOR PRETTL AND 54 F OR
DUNGS.
Min
'C'
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Inlet Test Nip;;l e
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WHEN RUNNING IN SERVICE MODE
NOTE: When fitted with the optional
d i verter valve (n ot supplied) and
running in service mode, the boiler
will operate both central heating and
hot water circuits.
If fitted to an S or Y plan system , the
system must only be run In central
heating m ode.
REPLACEMENT OF PARTS
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33.2
33.3
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SETIING THE GAS
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AIR RATIO
FOR THE SIT 848.093 SIGMA
33. Setting the C0
2
Note: When running in the service mode, the
boiler will operate both the central heating
&
OHW
circuits.
This is to allow sufficient time for
the setting procedu(e.
It
will be necessary to run
sufficient water through the OHW circuit to
ensure that the boiler will not cycle on low
heating demands.
33.1 Connect manometer to inlet pressure point
on the gas valve.
,. To adjust the
COz
it will be necessary to
flfst
opera'~ the.
boil&r
at
maximun
output
,. Press and hokl dovm the sei'Vic:e buHon (A) for
10
seconds until illuminated. The blue power
indlica!Of' will flash.
33.2 Turn central heating contfo!
to
maximum;
the boiler will then
go
to maximum output.
NOTE: The contrd will resume normal operation
aftet' 15 mi"lutes or
if
the. service button is pr&ssed
fey r:tter a second.
33.3 Using a 2,5mm allen key set the C0
2
via
adjus-ter (B) using the table below.
C02 settln!JS
for
Greenstar I System
NOT!.
CO, should be measured after
10
minutes
Gas type C02 setting C02 setting
maximum
minimum
Natural gas 9.8% ± 0.2%
9.2% ± 0.2%
LPG 11.0% ± 0.2%
10.6% ± 0.2%
CO · less
than
200ppm
(o.oo2
ratio)
,. Check CO is less than 200ppm.
,. Measure
the
inlet pfoosure;
it
should be no
leS>Ihen 18.5mb NG
or 37mb for LPG.
33.4
Set
the central heati"9 control to minimum.
The boilef will go to minimum powef.
33.5 Measure
the
C0 2
and
check against the
table above. II
required adju>t (C) on
the
gas
valve until the correct measurement is set
Remove bra. s s dust cap with flat bladed
screw driver. Then
us.ing
a 4mm aJien key
adjust C0 2 . Replace dust cap.
,. Return to maximum and re-check
the
C0 2 .
If
correct press
and
hold
dovm the
setVice
button tor 2 seooods: the button will cease
to
be illuminated and the blue power inclcatCY
will
be permanently illuminated.
,. RemoYe manometer and re-seal
inlet
pressure
point on gas valve.
,. Re-assem~e and refit boiler case.