Green Star 25Si User manual

25Si/30Si
· ~HUNG RSF GAS-FI ED CONDEN SI NG COMBINATION BOI LE R
" 'I JSJa
STEMS AND MAI NS FED
THEAPP LI ANCE IS FORUSEWlTH
NATURAL GAS OR L. P.G.(Cat 112H3P TYPE C13 & C33)
N
ATURAL GAS: WORCESTER GR EE NSTAR 25Si GC NUMBER 47-3 1t· 84
WORCESTER GREE NSTAR 30Si GCNUMBER 47· 311 · 65
LI U UI U PET ROLEUM GAS: WORCEST ER GREEN STAR 25Si GC NUMBER 47-311·88
WORCESTER
GREENSTAR 30Si GCNUMBER 47 ·31t·89
INSTRUCTION MANUAL
INSTALLATION,COMMISSIONING
& SERVICING
(/Jenchmorlf ) CHECKLIST & service
interval record, printed within this
manual

SYMBOLS U SED IN THIS MANUAL:
Domes tic hotwater
Central heating
Hotwater storagecylinder
Cold water
ma insupply
Electricity supply
Gas supply
LIFTING AND CARRY ING PRECAUTIONS:
• lift onlya manageabt.& we ig h t, or ask fOr
help.
• Wilen l ift i ng the boiler, bend the knees.
and keep the back straight and feet apart.
• Do not li ft and twist at the s ame ti me .
• lift and carry the boilerclose to t he body
Wea r proteeti vO; clo th ing and gloves to
prot&et from any sharp edges
IN STALlATION &
SE R VICIN G INSTRUCT IONS
INSTALLATION & SERVIC ING INSTRUCTIONS
PLEASE READ TH E SE INSTRUCTIONS CAREF ULLY BE F ORE STARTING INSTALLAnON.
THESE INSTRUCTIONS ARE APPL ICABLE TO THE WORCESTER APPUANCE MODEL( S)
STA TED ON THE FRON T COVER OF THIS MANUAL ONLY AND MUST NOT BE USED WITH
ANY OTHER MAKE OR MO DEL OF APPUANCE
TH EINSTRUCTIONS APPLY IN THEUK ONLYAND MUST BEFOLLOWED EXCEPT FOR ANY
STA TUT ORY OBLI GATION.
THISAPPLIANCE MUST BE IN STALLED BY A COMPETENT PERSON. FAILURE TO INSTALL
CO RR ECTILY COULDL EA D TO PROSECUTION.
IF
YOU ARE IN ANY DOUBT CONTACTTHE WO R CESTER TECHNICAL HELPLINE.
DI
STANCE LEARNING AND TRA IN ING COURSES ARE AVA ILABLE FROM WORCESTER.
PLEASELEAVETHESE INSTRUcnONS WITHTHECOMPLETEDBENCHMARKCHECKLIST,
(
OR A CERTIFICATE CONF IRMIN G COMPLIANCE WITH IS 81 3, EI RE ONLY) AND THE USER
MANUAL WITH THE OWNER OR AT THE GAS METER AFTER INSTAlLAnON OR SERYIC·
lNG. THE BENCHMARK CHECKLIST CAN
BE FOUND IN THE BACK TWO PAGES OF THE
INSTALLAnON M ANUAL
ABBREVIAT IONS USED IN THISMANUAL:
0 D iame ter
NG
L PG
CH
DHW
N atural Gas
Liquid Pat r oJ au mGas
Central Heating
Domest ic Hot Water
Ingress ProtectionIP
SE DBUK Seasonal Efficiency of Domestic
SoBers in the Un itedKingdom
Check List
Ha rd ware/Li te rature p ack
Item Qty
Greenst ar 25 Si /30 Si lnslallation/Servicing ln sl ruclions .............. .. .... .1
Users Instructi on s .... .. ...... . .... ... .... .. ...... . .... . ...... .. ...... . .... . ...... .. .... ... .... . ...... .. .... 1
C
ons umer Guarantee Ca rd .... .... .. ..... .. .... ... .... .. ..... .. .... ... .... .. ..... .. ........ ... .. ... 1
Sea li ng Paek .... ... .... .. ..... .. ........... .. ... .... ... .. ........... .... ... .. ..... .. .... .. ..... .. ... ........ .. .t
Co mpr es sion Nut 22 mm .......... .. .... .. ............ .. .... .. .................. .. ............ .3
Co mpression Ri ng 22 mm ............ .. .... .. ..... .. ..... .. .... .. .............................3
Comp ression Nut 15 mm .. ........ .. ...... .. .................. .. ...... .. .................. .. ... 3
Co mpr es sion Ring 15mm ............ .. .... .. ............ .. .................. .. ............... 3
Fibre Washer 18.6 x 1
3.5 x 1. 5 .. .... .. ............ .. .... .. ............ .. .... .. ............ 2
Fibre Washer 23.9 x 17.2 x 1.5.................................................... .. ....... 2
Bonded
Was her 3/4 ..... .. .......... ........ .. ..... .... . ........ .. ..... .... . .. ...... .... . ...... . .. 1
Ir is h Guidelines le aflet .. ............ . ... ........ . ...... .. .... ... ............ . .... . ...... . ...... .. .... . .. 1
Warranty Return Envelope
.. .... .. . .... .. . .... .. .... .. . ..... .. .... .. .... .. . .... ... .... .. .... .. . .... .. 1
INSTAUATION~ SERVICING INSfRVCnoliS FOitWOACESTtRGfi.EENSTM 211SV<K>Si
8 716 112 Cle3l (OoVOO)
~ WORCESTER

CONTENTS
SAFETY & REGULATIONS
IMPORTANT INFORMATI ON AND SYMBOLS
SAFETY PRECAUTIO
NS AND I NS TALLATION REGULATI ONS
APPLIANCE INFORMATlON
GEN ERAL I NFORMAnO N
T
ECHNICAL DA TA
LAYOUT& COMPONENTS
PRE-INSTALLATION
CLEANI NG PRIMARY SYSTEMS
MA I NS SUPPLY
WATER SYSTEMS & PIPEWORK
CONDENSATE PIP
EWO RK
PRESSURE RE LIEF PIPEWORK
BO IL ER L OCA TI ON & CLEARANCES
PL
UMB ING MANIFOLD
FL
UE TE RM INAL POS IT IONS
FL UEOPnONS
INSTAllATlON
UNPAC KI NG TH E WA LL FRAME
WA LL MOUNnNG TEMPLATEI FLUE OPEN IN G
UNPAC
KI NG TH EAPPLIANCE
BO IL ER CON NECTIO NS
FLUEIN STALLA TI ON
CONDENSATE CONNECnON
ELECTR ICS
P OSinON OF WIRED COMPONENTS
COMMISSIONING
PRE- COMM I SSION ING CHECKS
FI LILIN G THE SYSTEM
STARnN
GTHEAPP UANCE
WATER TREATMENT
COMMISS IONING
FINISH
ING COMM ISSIONING
SERVICING & SPI\RES
INSPECTION AND SER VIC E
REPLA CE MENT OF PARTS
SEmNG T HE GAS /A IR RA TIO
SHORT PARTS LI ST
CONVERSION KITS
L .P. G. CONVERSI ON
FAULT FINDING & DIAGNOSIS
FAU LT AND I NG
CH FUNCTION
DHW FUNCTION
PROTECTI
ON FUNCTI ON
BENCHMARKCHECKLI ST
SERVICE INTERVAL RE CORD SHEET
~ORCESTER
BoschGt®p
IHGT/UATJON6 SEIMOiiG ~STRUCTlONS I'OR WORCESTER GRttNStNI 2t.S0/30SI
8716112053a(C4105}
1
3
4
6
6-7
8
9
10
11
12
13·14
15
16
17
18
19
20
21 ·2 2
26
27
28
29
30
32
33
34
35-40
41 · 56
53·56
56
57
58
59
60
61
CONT E NTS

SAFETY PRECAUTIONS
IF YOU SMEll GAS :
X DON'T SMOKE OR STR IK E MATC HE S
X DON'T TU RN ELECTRICAL SW ITC HES ON OR OFF
./ DO PUT OUT NAK ED FLAMES
./DO OPEN DOORS AND WINDOWS
./DO K EE P PEOPLE AWAY FROM THE AR EA AFF E CT ED
./ DO TURN OFF TH E CONTROL VALVE AT THE METER
./DO CAll YOUR GAS COMPANY
(M«h-lf)
A Benchma rk Chec kl ist is pr ovided by t he manufacturer fort he lnstaller to oomplete
lnc!uding t hei .r CORGI registration number to conf irm that the boiler has been ins ta lled,
commiss ioned and serviced according to the ma nufacturer's instructions.
IMPORTANT: T he completed Benc hmar k Checklist wm be required in the even t of any
warranty work and ma y be required by the locaJ Bu ild ing Con trol Inspector.
HEALTH & SAFETY
The appl ia nce contains no asbestos and no substances have been used in th e
construction process that contravene the COSHH Regu lat io ns (Control of Subs tan ces
Hazardou s to H eaJth Regu lations 1988 ).
COMBUSnB LE AND CORROSIVE MATERIALS
Do not store or us& any co mbustible materials (paper, th in ners, paint& et c.) ~ side or
within thevicinity of the applianoe.
C1le mically aggressive substances, such as halogenat ed hydrocarbons containi ng
chbcine or fluorine compounds can corrode t he appliance and i nva lidate anywarranty.
FlTTING & MODtFlCATIONS
Frt ting the appliance an d any controls to the appliance may only be carried out by a
competent engi
neer in accordance wi th the current Gas Safety {Installation and U se)
Regulations.
Aue systems must not
be modified in "'ny way other tha n as described in the fitti ng
instructi on&. Arrt misuse or unauthori sed modifications to the app fi.ance, fl ue or
assoc i ;~,ted components :~~nd sys-tems could inva lid\\te th e warranty. The m anu facturer
aocep ts noliability arisillg from any such action&, excludi ng statut ory rights.
SERVICING
A
cNis e the user to have th e system serviced an n ua lly by a competent, qualified
engineer (such as Brit
is hGas or CORGI mgist &red personnel) usi~ approved spares,
to he lp m ainta in the econo m y, safety and reliability of the appliance.
IMPORTANT·The service engineer must complete the ServiceRecord on the
Benchmark Checklist aft er each service.
INSTALLATION REGULATIONS
Current Gas Safety {Installation & U se)
Re~ l at i ons :
Al lgas appliances mUSI be in stal l ed bya com-
petent person in acco rd ance with the abcwe regU a·
tions. Failure to insta ll ap pliances correctJy cotld
leod to proseout;on .
Th eappliancemust be inS1aJiecf in accordance with,
a nd comply t o. thecurrent Gos Safety R,gulat;ons,
lEE Regulations , Bu ilding Regu l ations, Build in g
Sta
nd ards {Scotland) {Consolidation), B u~d in g
Reg;l at ions {Northem I reland) , bcalwatar by- l aws,
H.alll & Safety Doct..ner< 635 (Tho El ectricity at
Work Reg ulations 1 989) and arry other local
requ irements .
British Standards :
Th e releva nt Bfitish Standards should be lollowed,
including:
BS7074:t :Code o1 practM:e lor clclmElstic and hoi
water supply
BS669t :I nstallation ollow Jl'OSS U "' gas pipewori<
up to 28 nvn (R1)
BS5546 : Instal l ation olgas hot wate r auppr.,. !Q r
do m ~ic purposes
EN:t2828: Central heal i ng lordomest ic premises
885 440:1 : Rues a nd ven t ilation for gas appli-
ances ol ra ted heating not exceeding 70kW {net) :
Rues
855 440:2 : Au .. and ventaation fOr gas appli-
an ceo ol rated heating not exceedW>g 70kW { net) :
A; r Supply
B$7593: Treatment of waterin do mestichot wate r
cen1ro1 hooting syslems
BS 6796 : Installat i on of gas fired bo ilers ol r ated
input upto 7CJ<W (net)
Where no speci fiC instruction is given, relerenoe
should be made to the re l evant &rush S!Andard
oodes of P ract ice.
LP.G.I.......
otion:
An app li anoe using L. P.G .must not be in stal l ed in a
room or intem al spaoe below groun d l eve l un l ess
one side of the building isopento the groll'ld.
Tmber framed bu ildi'lgs:
WhElre the boile r is to be frtted to a t im ber framOO
bui1ding the guidel ines l aid down in 85 5440: Part
1 and I GE "Gas I nstallations in Ti mbe r Frame
Bu il din gs" shou ld be adhered 1o.
A:>table waler:
Al l seals, joints and co~nds (includ i ng flux and
sol de r) and components uood as part ofth0 &o~
ondary domestic war&r sys:Mm rrust be appr0¥$d
byWRAS .
CH water:
Mific ; ally softened water must not be used to fin the
centmt heating sysoem.
SAFETY PRE CAUT IONS INStAt..I.IJION4
SERYlCING INSTRVCnoliS FOit .,.,'Of!CESTER GRE:ENSTAA 211SV<K>Si
871G 112oe3.l{bo\fooJ
rwoRCESTER
& I NSTALLATION REGU LATIO NS

(When fitted to wa nframe)
Oeplhtowal
.1
-
Check List
Hardware/Literature pack
A
700mm
Item Qty
Greenstar 25Si I 30S i Installation/Servicing lnstructions.....................1
Users ln . stntetions ........................................................... . .. ..... . ..... . .. . ...... . ....... . .... 1
Consumer Guarantee Card .........................................................................1
Sealing Pack........- ......... ....................................................... ...... . ....... . ..... . .. . ...... ..1
Com pression N· ut 22· mm ................................ . ....................................... 3
Compre . ssion Ring 22mm ..................................................................... 3
Comp ression Nu t 15mm ......................................................................3
Comp ression R ing 1 6mm ............................................................. - .... .. 3
Fibre Washer 18.6 x 13.5 x 1.5 ................................... ....... ................. 2
Fibre Washer 23.9 x 1 7.2 x 1. 5............................................................. 2
Bonded Washer 3/4 .......................................................... ..... .... ...... .. .... 1
Irish Guidelines Leaflet ................................................... ...... . ............ . ...... . .... 1
W arra nty R etum Env elope ........................................................................ . .. 1
~ORCESTER
~G~p
GE NERALINFORMATION
STANDARD PACKAGE:
A • Wall t..nggasfred condensngoombi boo l oriO<
centraJ heating and domestic hot water
B ·Boiler support frame
C ·Hardware literature pack (seechecklisl)
D • Bonom Panel
0
SPECIACATIONS:
~wired Olld p<e-plumbed
Gatvanised steel Wlner frame
Digital control system
Automalic ig>ition
Direct -ig>ition electrodes
Boilt-in host thormootat
BUl-in laulllin<ing ciagnostics
Modulo6ng outomaOc: goo valve
Combwtion oirlen w~ opeed ~Of
CH temperahJre sensor &. eonttOI
Pump anti-seizure protection
Flue gas temperature limi ter
Condens.ale trap & syphon
OHW flow sensor & tempetature control
Plate type OHW heat exchMger
B
GENERAL IN FORMA llO N

TECHNICAL DATA
DESCRIPTI ON NATURAL GAS L.P.G.
Domest ic Hot Water UNITS 25Si 30Si 25Si 30Si
Min. heat input KW 7.38 7.38 9. 64 9. 64
Max. ra ted heat output KW 25 30 25 30
Max. rated heat input KW 25 . 51 30.61 25.51 30.61
Gas flow rate· Max. 10 mi nutes from
Natural Gas G20
m'l h 2.7 3.24
Pl'opane Gas (LPG) kglh 1.98 2.
38
Max. mains inlet pressure bar 10 10 10 10
Min. mains inlet pressure (wo rking) formax flow bar 1 .3 2 1.3 2
M in . mains inlet pressure (working) for operation bar 0.2 0.2 0.2 0.2
Domestic H ot Watertemperature range •c 40·60 40-60
40·60 40·60
Domestic H ot Waterspecific rate · 30
9C
rise Vmin 12 14.3 12 14.3
Max. D omestic Hot Wa.ler f low rate · 4<>-C rise +1- 15% I/ min 9 1 0.8 9 10.8
Centra l Heating
Max. rated heat input KW 24 . 62 24 .62 24 .62 24 . 62
Max. rated heat output 40 / 30
9C
KW 25 . 67 25 .67 25 .67 25 .67
Max. rated heat output 50/30°C KW
25.45 25.45 25.45 25.45
Max. rated heat output 80 /6 0°C KW 24 24 24 24
Max. flow temperature •c 82 82 82 82
Max. permi:sslbleoperating pressure bar 2.5 2.5 2.5 2.5
Ava i lable pump head at21°C system te mperature rise m 2.0 2.0 2.0 2.0
Flue
Rue Gas Temp. 8016~C . rated/min. l oad •c 78/65 78166 79 /6 6 79/67
Rue Gas Temp. 40/30'C . rated mm.load •c 54/37 54/38 55 / 40 55 / 41
C0
2level at
max. rated heat output (after 30mins) % 9.8 9.8 11 .0 11 .0
C02 level atmf n. rated heat output (after 30 mins} % 9.2 9.2 10.5 10.5
NOx ·class 5 5 5 5
Condensate
Ma.x. condensation rate 1/h 2.0 2.0 2.0 2.0
pH value, approx. 4.8 4.8 4.8 4.8
Electrical
Electrical powersupplyvottage
AC ... V 230 230 230 230
Fre quency Hz 50 50 60 50
Ma.x. power OOil$Umption w 140 140 1 40 140
Gener al Data
SEDBUK band A A A A
Appliance protection rating
IP X40 X40 X40 X40
Appliance protection rat i- ng with mechanical or RF mechanical timerfitted IP 20 20 20 20
Permi&slbh~ ambient temperatures •c
0·50 0·50 0·50 0·50
Nomlnal capacity of appliance lt r 3.9 3.9 3.9 3.9
Noise output level (Maxcentral heating} dB(A) 42 42 42 42
Packaged bo i t.ar weight kg
44.4 44.4 44.4 44 .4
Total boiler w.aight kg
39 .5 39.5 39.5 39 .5
Lift
we ig ht kg 27 .1 27. 1 27.1 27.1
SEDBUK %
90 .t
90.1 91.8 91.8
TECHN I CAL DATA
INSTALLMION4 SERYlCIN:i INSf"'-'Cno liS F'Oit V.'ORCESTER G ~Et-:ST AA 2!iSV30Si ;WORCESTER
8716 112C11!>3.1.~
Bosc:h Group

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LAYOUT & COMPONENTS
'
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'
• • •••••
55
54
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LAYOUT & COMPONENTS
10 PLATE TO P LATE DHW
HEA T EXCHANGER
32 SYSTEM PUMP
36 FLOW TU RB I NE
37 UNUSED PORT
38 A UTO A IR VEN T
39 FLOW CONNECTION F ROM BO IL ER
HEA T EXCHANGER
40 DHW SENSO R
41 CH FL OW CONNECnON TO
SERVICE VALVE
42 DH W OUT CONNECTION
43 CO LD WATER IN CONNECTION
44 CH RET UR N CO NNE CT I ON TO
SE R VICE VALVE
45 DIVERTER VALVE
46 PRESSURE R EUEF VALVE
47 COMPACT HYDRAU UC MO UNnNG
SCREW (2) TO BO IL ER
.t...~ 36
•
~ .... 32
.. .
•
•
•
45
48 CH TEM PER A TU RE CONTRO L
49 M AI NSON/OFF
INDI CATOR/ DIAGNOSnC LI GHT(BWE)
50 DHW TEMPERATUR E CO N TROL
51 SERV I CE M ODE BUTION
52 BU RNE RONINDI CATOR UGHT ( GR EEN)
53
MASTER SWITCH ON/OFF
54 ECO BUTTON
55 FAU LT RESE TBUTION
56 SYSTEM PR ESS UR E GAUGE
57 POSIT I ON FOR OPnONAL
PROGRAMMER
58 IN TE RNAL BYPASS WI TH IN
PLAS nC MOULD I NG
INStAt..LMION ~ SERVICING INSf"'-!Cnous FOit .... 'Of!CESTER GREENSTM 211svaoso ~WORCESTER
8 71 G112 em.. (Oo\I"'O) ~ WI

IMPORTANT : All th • follow i ng Pre · lnstalla tl on sect i on• mull be re ad and
requirements met beforestarti ng boilef Of ftue l nsta btl o n.
,-' - ', ··; ~ - '.'.' •,c ~. -;- -- , --;--,;-;- .-· • ·. '·•,, .' . -. ··.~
,-::_ ,i_•·,: :•. . • ill ,. \',T .'r[Tl ;-~ = _:::_-l'-'l''"
~ORCES'T!R
._,.._ INStJIU.AtlON 6 .sEl'MOfoiG
~N$ FOR~,_CI"UNflM 2~
1116 112CZJa(PI.IOSt
CLEANING PRIMARY SYSTEMS
I MPO RT AN T: O.bfls from the syst em ca n
damage lhe boiler end reduce efficiency.
Fa ilure to comply w lh the guidelines for
th e use of we ter treatment with th e
appliance will inv alldete th e a pp li anc,e
WatTaf'i ty.
BEFORE CLEANI NG THE SYSTEM:
ENSURETHE SYSTEM AND PIPEWORK IS
IN
GOO DWORK IN G ORDER
KEE P THE EX ISnNG BOIL£RI
CIRCULATI
NG PU MP WH ERE POSS IB LE
ORU
SE APOW ER FLUSHING MACH IN E
TO
AID THE CLEANS IN G PROCEDURE
BEFOREINSTAI.UNG A NEW
BO ILE R.
CL£ANINGTHEPRI MARY SYSTEM:
1 Fi l the ayotem wi1h cold woter ond
chedt lor leal<o.
2 Open .. droin ood<a ond -the
ayolom.
3 ao .. drojn - ond odd a sui1able
Hushing agent co mpollble with
alum i nium 11 the correct strength foe
the a:ys t om cond it ion n accordance with
the manufa ctur er's inscruct ions .
The PH value of the system water
must be leas than I or theappliance
guarantee
will be lnvalklated.
• Circulale the fl ushing agentbeforethe
boi ler is fired up.
4 Run the boi ler/system at normal operating
temperab.lre u ditec:led by the manufacturer
of the Hushing agenL
5 Drain ond 111ofo<Jghly lluoh 1t1e system to
remootethe IIUihong agen< ond debris.
CLEANING PRIMARY SYSTEMS

ATER EXPANSION VESSEL : MAINSW
A · Mfni e
B ·MAins
C• Non-re
0 . eo;ter
x-pansion vessel, part No. 7 716 102 105
water inlet
tum valve
D ········ •
A
•.
~~ ......
~, ..._ .
. .. .. .. :
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B c I 0
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MAI NS SUPPLY
~
MAINS SUPPLY
ELECTRIC SUPPLY:
•
Su pply: 230V · 50Hz. 1 40 watts
•
Ca bl e: PVC ;nsulated 0. 75m m' (24 x 0.2mm)
temperature rated to 90
9C.
• E xtemai3A lu se to BS 136 2.
• The app li ance must beearthed.
• IPX4 0 . NO TE: thP:s is red u ced to IP20 if the
fo llow ing mechanical timersare filted:
7 716
192 036 or 7 71 6 192 037 .
• All pip es to the boil&r must be cross - bonde d.
• Wiring must cornpty v.ith lEE wiring regu l atiQ"'s .
GAS SUPP
LY :
• B oi lers using NG must be connected to a
gove rned meter.
• L
PG boi lera m ust be connect&d to a
regul ato r.
• Installation and connection of the gas supply
to the boi l er must be in accordance wi th
856891.
• Underno ci rcu mstances should the s iz e of
t he gas supp ly pi pe be l ess than that of the
appl ian ce inl et connect i on.
• The m eter or regu l ator and pipework to the
meter must be checked, preferably by the gas
su pp li er, to enswe it is in good working or der
and can meet the gas fl ow and pressure
requirements in add it io n to the demand from
any other appliance be ing served.
WATER SUPPL Y:
Water mainspressure:
Minimum mains water pr essu re 1 .3 ba r 25$ i,
2.0 bar 30S i, for max imu m pe tf onnance.
Maxi
mum ma i ns fed wa ter pressure 10 bar.
If necessary, fit a pressure reducing va lve.
IMPORTANT: Non-return, back flow pre-
vent io n devices (Including those e. s.s ocl-
ated with water meters) fitted to the
mains water su pp ly can cause a pres ·
sure bu ild up which could damage the
bo lle r and other household app li ances.
• Where the ma ins water supply has a non·
return, back ftowpreventionvaJve fi tted , a
mini expansion vessel (A) should be connect·
ed to the ma ins wate r inlet pi pe (Bt between
the non·r et urn valve (C) and the bo i let {D) as
shown opposi te.
Use in hard wate.r areas:
Normally there is no need for wate r treatment to
prevent scale format io n as the maxi mum tem·
perature
of the DHW hoat exohanger is li mited
Hl the electroniccircuit.
In areas where t
em por ary water har d ness
exceeds 200 p pm , <::ons~ra. tion may need to
be given to the fitting of a scate prevent ion
device . ln such circu mstances, the adv k:e of
the locaJwater authotity sh
ou ld be sought.
Bold!Gmup

SYSTE M FlU
TYPICAL SEALED SYSTEM
A • Applianceexpansion ...... .
central heating
B·E.ma
-- ·
heating rerwn central
C· D.U.
p . p,...,.
codt
e relief cftteharge
R• Rodial ...
.... - .. ,
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~ORCESTER
ao.d1Gro41p
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s. .. ....
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uu u ul
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WATER SYSTEMS &PIPEWORK
PI.ASnC PIPEWORK:
• Any plost<: pipe-'< musl have a polymeric
barrier with 600mm (m i nimum) length of
copper orsteel pipe connected to
the boiler.
• Plast<: pipewofl< osed for onderlloorheating
must be correctlyconltOIIed wit 1'1 a
thermostatic blending valve limit ing tho
temperalura of the circuits to ~ox . &O"C .
The pipewor1< from the - IO tho blending
valve mosl be ;, -ex sleel (proloctod
from corrosion).
FRlMARY SYSTEMS CONNECTIONSNAIYES:
• AI system oonne®ons, taps and rni>ring
valves miJSI be capabled ""''aining a
fl<essun> op to 3 bat .
• RadiatO< valves sl>oUd confotm to
BS2767 : t0 .
•
AI othec valves should confonn to 8St010 .
• ThermostaticradiatOf valves CTRV'a) mutt be
used on ell radiators w~hin the sleeping
accommodation but not the
radiatOt where
the room thermostatis sited. This must be
fitted with lockshield valves and left open.
•A drain cock
is required at t he lowest poin t
in the
system.
• An ai r voot is req u ited a.l all the high po i nl t in
the syste m.
N OTE: The boiler i:s e qu ipped with an automa tic
internal by·pass.
SH OWERS/B IDETS:
• Ifa shower head can be im mersed in wateror
comescl oset> than 25mm f rom the topedge
of a bath orshower tray apal fYtler l evel t hen
an anti · siphon devfce must be fitted to the
shower~ hose.
• Bidets with direct hot and cold mafls water
can be used (with tM approval of th.e tocal
water authority) alld must be lhe ove r rim
floshing 1ypo with shrouded OU11eta 10 pr......,l
the fitting of handheld Sfl<lyl.
SEALED PRIMARY SYSTEM :
• The CH sealed system """" be foiled ooinga
WRAS awovod filling loop or com~ will
the <iagr.lm oppooitefor aya1om Iii.
• Wherethe ayatem YOiume is -•man tOO
itres or exceeds 2. 65 bar at maximum
healing ternperalure, an ema expansion
vessel (B) ....,.. be rolled as c looe aa poetible
to the $ppli :e.nce in the cenltal heatJng retum.
• F\oessurioe tile eM expanaion Y08MI (B) lo
the s:e.me figure as the expansion vesse l built
intothe appliance.
• Do not use gatvanised pipes
or radiators.
WATER SYSTEMS & PIPEWORK

Internal sink/washing mach ine drain.
A
•
l 't-1-- --.
100mm
min.
Soil and vent stack
A r
• E
II
/
0
I
c/
;::;
450mm
~ n . uplo
3 $10f9ys
d
c
A ·Conden6$te from boiler siphon/trap.
8 ·Sink with integral OYerflow.
C ·Plasticcondensate pipe .
0 ·External drain or gully.
E ·ln temal so il andvent stack.
F ·Setvicable condensate trap (?Smm min}.
CONDENSATEPIPEWORK
Internal wa.ste dra inage system
A
~t:J
t
! toan.n
mn. c
--... . l
1\\.
B
JJ
I 0
F/
'--?~
_/
. .. ..
i7
External
A
l
c _.., /
lip
G · 300m m x 100mmdia.sealed plastictube.
H ·Ground leve L
J •Drainage hotes facing awayfrom buiJd ing,
K ·limestone ch ippings.
L •Weathar res istant insulation.
CONDENSATEPIPEWORK
CONDENSATE Pt PEWORK :
o The condensate pipe must be a minimumof
22mm 0 plastic pipe.
o Pipe work length sholHd be kep t to a mini·
mum an d the route as vert ic al as possible.
o Where pipe work co u ld be subjected to
extreme coJd or wind chill aweatherpr oof
insulation should be used. A1temativety the
condensate pipework cou1 d be incteased in
size to a minimum 32mm0 wi1hout the
requi remen1 to insulate.
o The pipeWOt'k must follow one of the options
shown op po si t e. Either into nn intetnaJ
serviocaable trap (min. ?6mm) such as a
&ink/washing machi ne wa&:to, discharge
direct into a
vent stack (E) 460mm min.
above pipe invert, or into a gul ley (0) be Jow
ground but above the water level.
IMPORTANT: Ensure there are no
blcx: kages in the pipe run.
1 Internal sink/washing mach ine drain
2 Internal waste dra inage system
3 So i l/vent stack
4 External dral na 98 system
5 External condensate absorption point
INSTAU.MION~ SERVICING IN ST RVCno li S I'Oit WORC ESTER G RE: EN ST I$ 2 1!SV30Si
871 G 112~(0(100)
rwoRCESTER
B OSdiGroup

~ORCESTER
8osdl Gt041p
M
l
0
N
IHST/It.UITJON 6 SEIMONG ~STRUCTlO NS I'OR WORCESTER GRttNS"W12~aQSI
8716112053a(04105}
PRESSURE RELIEF PIPEWORK
PRESSU RER EL I EF P IP EWOR K:
IMPORTANT: The pressure re lief valve
is a safety device for the bo iler and rt
activated may discharge boiling water
steam
through the re lie f valve drain
pipe .
Ca re should be takon when siiing the
outlet pipe so that jt does not c:ause an
obstruction or discha r ge above a
w indow. entrance or other public access
w he re It could cause a hazard.
• The pr essure r e l ~f drain pi pe (M) fr om the
boiler should be at least 16mm diameter
c:opperpi pe and run downwar ds , away f ro m
any electrics oro ther h azard , preferabfy
to an external drainor soa.kaway.
P; pe (M) should be fi n;,hed with a p art;,l
b end, near the outfet to fa ce th e extetr\31 wa ll
(as s ho wn) to help prevent freez i ng .
l · Out s kle wall
O,M •D rain pi pe
N· Ex temal d rain
PRESSURE RELIEF PtPE WORK

SERVICING CLEARANCES
VENTED COMPARTMENT
Us ing 100mm fl:ue ki t
1080mm
Using 1 25 mm flue kit
• 111 0m m
930mm
• 20mm
, to remo vable door
'600mm
, front c let.~ rt.~nce
, for service
VENTILATION FREE COMPARTMENTS
INSTALLATION CLEARANCES
4 10 mm
...
+ '
'
Smm
200mm
Ventilation Free Compartment Installation Clearances
The suggested total unventilated compartment minimum clearance-s are:
Side Above
Below
Front (to removable door)
400mm 170mm ePI)rox . 20omm 100mm
(30mmabove
the elbow)
(N ot e: T op an d bottom clearances m us t not be reduc ed b elow these va lues as they are the
mini mu m required f or S$Mcing).
If Side Clearances are Reduced
If total side clearance Is Then overall
he 'siJh t d earances Front dnfilno. <tor•movabl•
reduced to : must be Increased to (apl)rolt):
OR
door) must be iACteased to :
••
•
35Dmm
441mm 129mm
300mm 523mm 161mm
i·
250mm 617mm
11
II
200mm
200mm 727mm 243mm
i· 150mm
856mm
-
295mm
100mm 1012mm 358mm
50mm
1202mm
II
II 434mm
If Front Clearance is Reduced
If front c:I Nrance (to
Then ov •ra ll M ~ht deara n ~s Total
side clearance mu st be
removabledoor) is must be increased to (epprox):
OR
i nc:reas •d to:
red uced to:
• ••
SOmm 511mm
506mm
25mm 596mm 569mm
BOILER LOCATION &
CLEARANCES
This boiler is onlysuitable f oc ins taDin g internally
wi th in a property at a su itable ~aHon onto a
f ixe d,r igid surface at l eas t the same size as the
boiler and capable of su pporting the txmer
waight.
COMPARTMENTS:
Follow the requirements of B$6798 and
B$ 5440 Part 2 and note:
• M inimum clearances must bemaintained
• All acceS$ door is re q ui r ed to i ns- t aJJ , seMce
and maintain the boiler and any ancilliary
equipment.
• If fitti ng the boi ler in to an airing cup board
use a non-combustible perfora te d mate rial
(maximum hoJe sizea of 13mm) to separate
the boi ler from the (!.ir ing space .
BOILER ClEARANCES:
The diag ram opposite shows the minimum
sp aca r&qu ire d to install and servi ce the bo iJer.
If a bo i ler is installed in a co m pa rtment with
ctearances les s th an shown in the tables oppo·
site, ventilatOO is required. Re f er to tabl es
below f or venti la tion require ments .
25&30kW
Vent To room or Di r ect to
position Internal space
outside
H ig h Minimum
free
M'JOimu m
lcwel
area 122cm '
free area
61 cm1
low
Minimum free Minim um
lcwe l area 122cm '
free area
61c m1
BO ILER CLEARANCES· UNVENnLATED
COMPARTMENTS:
The tab l es opposite show the op tio ns for the
m i: n imu m space required to i: nstall and servioce
the boil er inside an unventilated comp a rt m ent.
•NOTE: Th ese are th e co mbi ned top & bottom
c1earances exc luding the appl iance.
••NOTE: Thesa are tha combine d le ft & right
d earances excluding the appliance.
BOILER LOCATION & CLEARANCES INStALLATION4 SERYlCINGU<tSt~no
li S FOitV.'OACESTERGf!EENSTAA211S/30Si
8 71 6 117oe&. ( Oo\IOOJ
;WORCESTE R

~ORCESTER
Bosdl GtCMip
6
L OOm m
soomm
75 Omm
0 0 225
Omm
®
~
® 0
soomm
75
0mm
2250mm
600mm radius
IHSTIUATJON6 SEIMONG ~STRUCTIONS FOR WORCESTER GRtttiStNI 2t.SII30SI
8716112053a(04105}
BOILER LOCAnON &
CLEARANCES
BATHROOMS :
If the appliance is fi tted in conjunction with a
mechan ic al or RF me chanical time r, the
appliance can only befitted in zone@.
Oth&rwise the app liance can be filted in bo th
zones @and@.
See lEE wiring regulations.
IMPORTANT: any sw i tch or appl i ance
cont r ol using mains electricity must not be
able to be touched by a person us ing the
bath or shower.
Electrical switches, fused spur and socket
outlets must not be situated In the
bathroom .
BOILER LOCATION & CLEARANCES

CH Flow22m m
A
fj GasSupply (aftemative fromaboveappliance) 22 mm
OHW OUT 15mm
OHW IN (alternative fr om
abo ve appliance}_ T
15mm "5J-
CH Return 22mm
A
Ma ins Gas Supply 22m m Ma;ns Woter (OHW I
N) 15mm
PLUMBI NG MANIFOLD
CONNECTIO NS:
Heati ng System: 22mmcompression fitti: ng s
OHW: 15mm compression fittings
Gas: 22mm
Use the fitti ng s suppl ie d in th e lit/ H ardware
pack.
H the boilerpi pes are to be run behi nd the
appliance ensure that the pfpes pas& through
thesl ot int he yellowplasticguide {A}. Thi& is
frtted to the boiler frame.
Further guidance on pipe routing can be
foun d pr in te d on the boiler te mplate
( supplied with the boi~r).
PlU MBING MANIFOLD
INStALlATION~ SERVICINGINSfRVCnoNSI'OitYo'OACESTtRGREENST.vt211SVaoso ~WORCESTER
s 'tlfi 112 em.. (OoVOO.l :;ii""'" WI

FLUE TERMINAL POSITIONS
Minimum dimensions of flue terminal po sit ions for belenoed room sealed flues with
fanned draught:
DRWQ. TERMINAl POSITION
REF :
A'
O.reclly below an openl"'g, .. , bnck, opening windows, etc.
B' Above an
openWlg . 81r brick, opening window. etc.
C' Horizoolaly to.., opening, oit bricJc, opo,..;ng window , etc.
0 Below gunero. 1001 pipe$ "' d,.., pipes
E Below N¥88
F'
Below bolc:onMio "' .,. port roof (loweol po;nt)
G
From a .....al chin pope "' toil pipe
DISTANCE
300mm
300mrn
300mm
151m>
200mm
200mm
t50nm
• The ft ue mus:t be fiH ed and lenninatod in
accordanca with the recommendations of
85 5440 : Part 1.
• The ftue must not cause an ob struction.
• Discharge and any
noise from the flue outlet
must not cause anuisance.
• Aue gases
have a tendency to plume and in
certain weather conditions awhite pkme of
condensation wil be discharged from the flUe
outlel ,... could be a nui:sance1 b exampr..
"""' sec.riy ighMg.
H From-.aor-...l.,.._or.,o bcordlry~ f>e
.
300~ *
• The air inleVoutlet duct ond the termonol ol
the boier must not be dooer than 25mrn to
arry oornbustible material
OetaJed reoommendationo on prot oc tion ol
combustible materials are g.ven W1
I Above
g.-ound . roof "' bllcony 300mrn
85 5440 :1.
J F
rom a su~ac:e or boundary toeing tl\o terminal 600~
• A protec6ve t"""O>al g...anl mull bo lilted il
tM termil\al is 2m or leu above a aurface
to whidl peoplo have acceso.
K From a terrn i ll81 facing the terminal
t200mm
L'
nom an-19 in lho ""'port (o.g. door,window) inoo lhe ~
t200mm
M Vertically from a termitlal on the same wall 1500mm
N Horizontal ly from a terminal on the same wall
300mm
0
From a non combustiblovertical structure on tM roof *
p
Abov t~ intetsection with tho roof *
0
Ad jaoenl to windows Md oponlnge on pitc hed or flat roofs 600mm
R Solow windows or openings Ofl
pitc:l\ed rooft 2,000m m
t In addition, the term i m~l should not be tttJarbt than tSOmm (farm~ dr~ught)
to an opening in the btlildlng fatxic l01med for the purpose of accommodating
a 00#1-in element such BS 8 window frame .
* See instructions supplied with verlkalflue lOts.
**Care should be taken to ensure terminal siting
does not cause a nuisance to •d}aC#Jnt ptopertie$.
:rWORCESTER
--
0
•
I N3lHJ.N ION I. "!WIC I NO IH:sfRUCTICNS P'Cft WC)II(£Sf01 6RIEENStA R ~1305
IT IG 11 1 (ll)lll C Q.UOG)
The guard must be spaced equa lly {mi"l i mum
50m m} around the flue and fixed to the wet!
with plated sOtews.
SeeContact In formation {b ac k coYer) .
Terminals ad j-acent to w indows or openings on pitched
and flat roofs.
The flue should not penetrate
the shaded area.
•
•
FL UE TER M INAL POSITIONS

STANDARD FLUE HOR I ZO N TAL
_Q [;J Cf =:OiPP A
0100
MAX 686 Ax 1
MIN 260 Ax I'
0126
MAX 1070 A X 1
MIN 250 Ax 1•
• Requires cutti ng
MAXIMUM FLUE HOR IZONTAL
0100 • 4600 mm
Ax 1 +Bx5
0125 • 13000mm
Ax1+Bx 13
~-- --· ····· · ... ······ ·· ···- ~
'
MAXIMUM FLUE VER TI CAL START+ 1 BEND
cO
0100 • 4600mm
Ax 1+ Cxl+Bx5+
F >l
0125 · 13000mm
Ax 1 + Cx1 + Bx 13
+ Fx 1
. •. ... . ... •. ... -· .. -· ··· ..!
(·· ··
l
MAXIMUM FLUE HORI ZONTAL+ 1 BEND
0100 • 2600mm
Ax. t + Bx3+Cx1
0126 · IIOOOmm
Ax1+ Bx 1t+Cx1
FLUE OPTIONS
MAXIMUM FLUE VER TI CAL
START+ 2 BENDS A
FQ I I.P
B
cO
0100 · 2600mm
Ax 1 +Cx2+ Bx4
+ Fx 1
0125 · IIOOOmm
Ax 1 + C x 2 + B x 13
+ Fx 1
MAXIMUM FLUE VERnCAL
STAR T + 3 BENDS
0100 · NIA
0125 · 9000mm
Ax 1 + Cx3+ Bx11
+ Fx1
MAX IMUM FLUE VERnCAL
WITH 2 x 45' BENDS
E~
B
o f!
0100 • 4400 mm
(i nc luding terminal)
Bx5+ Dx2 + Ex 1
0125 · 13000mm
(i nc luding terminal)
8x13+ OX2 +Ex1
VERnCAL FLUE WI TH
2 x so• BENDS
E Q
B
co
0 1 00 · 2400mm
(including terminal)
Bx 4+ Cx2+Ex 1
0125 · IIOOOm m
(including terminal)
Bx13+ Cx2+Ex1
FLUE OPTIONS
• The d i.ag r ~ma (opposite} show the
compo nents used and tho maximum fl ue
leng th fOI each configuration of 100m m and
125mm flues.
• Shaded flue c:o mponents indicate the
s tand ard 100mm horizontal Rue .
• Only sttaight flue sections can be reduced in
length and
cut .
• The fl ue termina l end can be fitt ed from the
in& i de or outside of the bui lding.
• Faing kits ara suppl i ed with the fl ue extensi on
lOis .
• Horizontal125mm and Vertical 100mm and
125mmflue ki ts are availab le with separate
instru ct i ons. Con ta ct your supplier or
Worcester.
A • Standard horizontal flue (1 00mm dia meter
shown)
B · Straight flue extension
C •Rue bend 90'
0 · Aue bend, 45°
E·Vertical terminal (vertical ada,otor supp lied
with terminal)
F ·Verti ca l adaptor (usad with horizontal
terminaO
Galoulating th& flu& l ength:
Measure the total flue l ength required, noting
that the maxi mu m sti.aight flue l ength i ndu ding
the terminal is:
Horizontal60f100mm: 4600mm
Hocizontat 80f125mm : 1 3000mm
Vetticat 601100mm: 6400mm
Verti cal 801125mm: 15000mm
Th en redu C(I the total straight flue length for
each extra
fl ue b&nd (excluding the flue el bow)
by:
2000m m f or 90°
1000 mm f01 45°
Fl ue Extension lengths:
Hocizontal & Vertical
60/lOOmm :960mm
HOrizontal & V&r1ica l 80/t25mm: 1000 mm
Fl ue Termina l lengths:
Hor izon tal60/100mm: 800mm induc:Sng tooninal
Horizontal80f125mm: 1200mm
Vee-tical 601100m m: t 1 40mm to top of terminal
Vettical801125mm: 1365mm to top of terminal
INSTAU/• TI ON ~ SERVICING IN Sf RVCno li S FOR WOAC E STE RG r..EENS TM 2GSi/30Sl
8 71 G 112oe&.{~
rwoRCESTER

IMPORTANT: All the previous Pro - Installation sections must be read
and requ~rements met before start1ng boelor or flue enstallat1on.
+ - B D
0 E {J
t::l
0
=
0
2
UNPACKI NG WALL FRAME AND
ANCILLARY ITEMS
UFTlNG AND CARRYING PRECAUTIONS :
• l.jft only a mana90able w.,;ghl, 0< ask lor
help.
• When ilting 0< putting thing• dowtl, bend
the knees. and keep the back auaight
and k!et apart.
• Do not itt and twist at tho same 11m0.
• l.jft and carry object• cloM to tho body
A • S"-
B• Outer carton
C · Installer pacl<
D · Bottom panel
E• Wall mounting frame
F • We/A ten'plate
G · Inner pacl<aging
I MPORTANT HANDUNG IN STRUCTIONS
• It is advised that two people are used to ca ny
the carto n from the van to the point ofd elivery .
• Once thecarton has been delivered, theouter
carton i$ removed fi rst Careehould be tak en
when releas i ng the st ra ps. If asharp implement
isused make sure the outer ca rton la not
pierced
and that the implement is used in such
a way so that it m ay not cause personal injury.
All sharpobjects must be CO"iered or the blade
retracted alter use and put away in a a.afo
G place. The waiJ mounting frame, lnstaler
c- -LJi/
1
:! ' \ ~ pack, template and bottompanel are now
removed. Care should be tal<en whon lifting lhe
boile< '""" the bQso and the P<OI* tec:Mique
lor safelifting of any 1\elr<y object should be
slrictly obse..-i
~ORCESTER
ao.dt GrcMJp
11'4GT .........IION6 ~111!\/ICI...O INsn!UCflONS 'Oft ~CZSlER GREtNS'IM 2t>Sii30SI
e 11• 112 OG:IatQtiOCI}
Additionol requirements lor roof ._e
-
• The boiler should be first unpacked before
ascencfong ladcle< IO loll apace.
• Two sets o1 steps should be used.
• Two people should share the iffing ol tho
boiler up to the loft hatdl, wllero tho booler it
entered intothe loll space tilted and llid on ..
back into the loh.
On ce the appliance it removed from i ta
pa ckag i ng check the conten ta again a t the
pacl<ing isL
Be fore Install ing appUance ensuresystem Mt
been dea ned es expla ined on page 8.
• 1. Remove s trap s (A) and open th etopof the
boil er packaging.
• 2. Remove template (F) and waU mounting
fr ame { E) from the packagi ng .
> 3. Remove boil er bottom ponol (D) and
installerpack (C).
UNPACKING WALL FRAME AND
ANCILLARY I TEMS

X4
USE APPROPRI ATE
AXI NGSFO R
WEIGHTAND
WALL
TY PE
WALL MOU NTING PLA TEFL UE OPENING
•
•
\ \
•
• •
.. .
• •
.:
B
.. '
.. '
\ ' , ~""
\ \ I r
,, , ....
\ 1 I ;;
cfj '
-
-
WALL MOUNTING TEMPLATE
FLUE
OPENING
CAu: :o r, rw:ur"=' ·he·e are rw r_: 1p'='::.
c ,__ ·,~;1· c c::abl'--':~ carnp :Jrccf u.:: u r:~l':~ ~r
c_:,~ht'r h.JZ ; rdt . b•/ore driii1··:-J
SAFETY:
AD relevantsafety precautions must be undertaken .
Protective clothing, f ootwea r, gtQves and sa tety
goggles must be wom as appropriate.
FIX IN G THE MOUNTING FRAME :
The boilertemplate shows the rel a t~
positions of t he fl ue and t he t op and bo Hom
fi xing of the mounti ng fram e.
• Fi~~: t he tem pl ate to the wall in t he desi: red
position W.
• Drill 4 holes f or the wall mounting frame
t hr oug h tho to mpl<lto (2).
NOTE: The template has been siz&d to all ow fo r
mini mu mclear ances of 5mmsides, 200mm
base and 30mm above a 0100m m flue elbow.
REAR F LU EO UT L ET
• The drawing (B) op posite shows t he boiler
te mplate with the fl ue ce n tre linea of both the
10 0mmand t25mm fl ue systems.
• Mar k centrelineof flue to be used (1); the
externald iame ter of the hole can also be
mark ed arequired.
• Ha 0100mm d ia mete r flue is to be used ,
a125mmdiam
ete r holeis req ui red . Ho wever, if
us ing the weathersealing col fa r by pus hi ng it
th rough fr om inside the property, then a
150mm d iam eter hole is required to
acc o mm odate this.
• The terminal sect io n of the 10 0mm fl ue has an
inbuilt 3° ang le.
Hextensions are to be added then the complete
fl ue must ri ~ at an angleof 3° .
• The 125 mm 0 flue sys tem wa! requi te the flue
tori se at a.n angle of~ .
• Drill ho le us ing a core dr iUor similar.
SIDE OU TLET :
• Mru k from t he cen tr e r ~ne of the wall template
to the wan wh ich the fl ue wilt pa$$ through (3).
• A llo w for a r ise of 52 mm per metre length of
flue, to give a 3° angle.
• Cfear any debris fro m the site.
• A pre· firti ng kit 7 716 192 282 is available for
lns tallations where the bo il er wiU no t be fitted
immediately to the heat il g system. T tis allows
the heat i- ng system and mains water co nr lec·
ti ons to be filled and checked pt io r to bo i ler
(nstallati on .
This ki t can be used in con junctionwith the
opt ional f ~ l in g loop 7 716 192 281 (not sup ·
pl i ed with the boiler).
INStALlATION~ SERVICING IN SfRVCnoNs I'Oftv.'OACESTER GRE:Et-:ST M 211SV30Si ~WO""'ESTER
8 71G 112 Cll!& (o.vo&) :;i"" WI n. '-'