Heatline C24 User guide

LINE
C24/C28
Condensing
Wall Mounted
Combination Boiler
Installation, Servicing
&
User Instructions
•
'
:-+ ·: _.. )

~atural Gas
Heat LincTMC24:'C28 Cu n<lc: nl) in g Combirutl ic m Boil er:-
.Br itis h GasScrvioc Listing
C24 Conde n si ng Co m bin•tio n lloi lcrG. C.No,4i -1 57-ll6
C28 Condensing Co mbination BoilerG.C.No 47 -J S7 -07
'f'he Heat U nc '1M r.mgeof heating ho ilersare m.mufac tured
from high qua lity mater ia l s, enabling rel ia bi lity and
optimumperformauce.
Heat Llne
T"' ilrCco mm itted 10 I.he C::<)nti nualdt:vel op ment
of the ir appliauces to ensure their customers bene fi t from
th e Jate S1 adva nces incombustion tocbnology and energy
.5avi n gl> .
Type test for purpose. of Regulation 5 certified. by :
No ti fi ed Body !~IQ 51BP2727
SIBP2728DR
J>roduct1 Prod uction oc rt ificd by:
Notified !Jody I MQ 518P2727
51BP2728DR
C. E direct i ves 90:3% / CEE
CE directives 92/42/CEE
c~ directives 90;1%/(;ctl
CE direct ives 92142iCEll
The 1uan. ufacrurer, in thecont im lo us process to i.tnprove his pro du cts, reserves
·the r ight to n,odify th e data c-xp r cssocl in t he presentdocumentation ;:it any time
,a nd wi th out p ri or no ti ce.
Th epresent d ocumentation isan in.f ornunivesupport and it cannot be considered
.asa contracl t Ot'.<ards cbird parties.
~IMQi
WRAS do;11~
APl'"oO"
PR
(J,ench,qqrJr )
'Benchma rk ' Log Book
• Heating&
Ho tw"ter
lndust~
Council
A!i. part of lh i: . in du.s t.r y- ""idt: ini tiatjve th ~C24/C28 co:m es
comp.lete,'\itban Installation,. Commissioning and Ser,ice
Record Log B ook. Plc,,sc read 01 e Log bookcarefully
and comp lde al l sections rclevanl to iheappliance and
instalJation.
Th e details within che Log Book w ill be
requ ired in the eve nt of any warranty wo1·k.
On (:omple .tio n the Lug Dook must be left with the end
us e.r and the relevant sectio ns comp le ted on each
subsequent Servi ce vi si t.

Con ten ts
Section IPage I Section
Preface 3
14. Comn1issioning
25
I. Installation Regulations 3
15. OnboardAdjustments 26
The Signs on Box 4
16 . Safety De vices 28
The Sif,'TIS on Boiler 4 17. Rout ine Servicing 29
2. Technical Data 5 18 .Component Rep lacement
33
3. BoilerCharacteristics 8 19. Gas Type Conversion 45
4. Operation 9 20. Fault Finding Chart 46
5. Ge neral Installation 11
6. App liance Siting
13
Appendices
7. Fl ue Terminal Location 14
Appendix 1. Spare Part~List I 52
8. Gen eral Flue lnfo 16
9. Electrical Connections 17
User Instructions 53
I0. Boiler Installation 19
11. Gas Supply 23
1 2. Filling the System 23
13. Co ntro l Pan el Functions 24
2

Pr ef ac.e
The Heat L ine™ gas f ired, condensing combination boiler meers the
r equirements of regulations an d is d oc mcd to meet the re quirements
of :
0 GasAppliance Direct ive
a Bfficicncy Uircctivc
O Low Voh age Directivennd;
LI El ecttomagnttic Compat jbi li ty Dir ective
Hea l l..ine''Mdeclare lhat the m ate ri als u sed in th e man ufa cturer of this
appliance are n on -hazardous and that no s ub s tances harm ful to bea llh
areconta fo ed wilhiJ l t he appliance.
Th e C24/C28 mu s1 be instalJed in accordance with (bese instructioils
and the regulations currently io !"' Orce. Read th ese ins tructions f ull y
bc fbn: insta lling()r u sing the app l iance .
Heat L i.JleT Mac ce pts uo responsibili ty for unsatisfactory J) erfonnance
<1f the :.ip pli ancc or flue arii s:ing from th. c foilurc to comply with the
in.'>tnlla ti< )n instructions.
lf1. he boiler is sold or installed to another customer. a JJ of the documems
m ust be trani.fcrr c:d from c:xisting customer to the new one.
3
1. Installation R eg ulations
1.1. AqualifiedC.O.R.GJ. registered en gi.neet i.o accotdauce with the
Gas Safe ty (Ins tallation and Use) Rcg ulationsj October 1994 must
only in s tall th is ap p liance. Failure llJ inst all ap p li an ces «Jrrtclly
could lead to proseculion.
1, 2. All C.0.R.G.I. Rcgisicro<I Ln sLa l .l crs ca rt )' a C.O . R.G . 1. )0 card
and h ave a rc:gi))lnt tion numbt:r-, which sh ou ld be ~curded and
en t ered ooyour benc h mar kl og book . You can check your Installer
rogistrati
oo. by cootacting C. 0.R .G. I. on 0870 401 2300
1...3. The manufacturer 's i.ustrUctions tnu sc no t be taken as over.riding
s-tatutory rcq , ui..remeuts ,
1..4. The: inst allut iun of this ap plia nce m us t be in uocorduncc: wi th the
rele,'Mt requiremen ts of the Gas Saf ety Regula t ions and Bt1i1ding
Regulations.
J .S . To ensure tM' tthe in stallation"~ 11 perfonnto lh~ higheststandards,
1 be system and compo ne nts should conform to aay other re levaul
standa.rds..
Foe further adv i ce or i. nfo rnu tioocomacr Heat Linenl Ser.,.ice Enquiries
by telephone on 0870 609 2091 or e~maH al our web site
www . heat line. co .uk
For teclulical iuf onnatiou. J>lease contact Heat UneT.M Tec hni caJ on
08707778318.

(€
The Signs on Box
The sigo of qualicy ; C24iC28 combina1ion boiler is
certified by fMQ I taly .
C24/C28 combination bo il er must be ,woided from
mking damage by fa l ling etc.
Keep away the: hox from waler , nu n etc .
C.24/C28 crui be scored up to 5 boil er in one column.
No pressure from sides of the box. .mus- 1 be applied,
This Way Up : The bo.x mustbe s.1orcd in the posit ion
th at thisarr ow shows up .
4
The Signs on .Boiler
Room Thcauostat:This sign is pla ced on Ute left side
,on the cor:urol panel plastic a. od describes t.hc roo m
'1. hennostat c(,nn~ ion.
Warning! High Voltage: This sign is placed on the
1car s id e of control panel plas ti c and d esc ribes 1bat
1here h; high voltage on ma in PCB. If servic in g wi ll
be carried out on main PCB by opentng the -.;o ve . r,
<:iccuic supplymus, be nu-ucd Off.
Potentiometer Cover: This sign is placed on 1 h;e rear
side of control pa nel plastic and shows that the
JIOICnti (1meLcrscan hereached by removi ng thi-1 cc,-v cr
10 make fu.rther adjustments.

2.TechnicalData
C24
C28
C24 C28
(24kW) (2 8 kW) (24 kW) (28
kW )
Heat rnp ul (max) kW 25 .1 28.S
Ma xi.town healing ''C
SS 85
tc i:upc ,:a rurc .
Heat Ou 1p ut (max) kW 24.82 27.47 Max.
<lomestic hot \lt'1JU :r
1e mpe rn nn-e
"C 64 64
Heal Input (mm)
kW
10.12 IS
Oper..it i ng pres sur e (Oar)
PMS 3 3
(Min) (0·8) (0·8)
Heat Outp ut(mi n) kW 9.27 14.26
Dom esti c water sup , ply PMS
8 s
pr essu re (Bar) (Mi n) (0·25) (0·25)
UsefuJ efficiency at %
9~.o %.4
I00%1osd
fapansion Ves sel Capacity
L itres
7 7
U~ cfuJ efficiency at
% 99 .09 JO I
30% load Ex
pansio nV es~ I O·S
0·5
Pre-charge ~ SS Ul't'
mm
R1.1 m cr injector ffi
lll , 1.23 1.20
<Natural Gas\
Bu rn erinjector
tn m. 0.76 0.76
/G30l
Burner Pressure
m ba r
Max 12 .7 Mas 1
1.6
(NawroJ Gas) Mio 2.0 Mm3.S
Rumer Press u re
m ba r
Max 27.8 Max 27.7
(G30)
Min 4.4 Min6.l
L>o mcstic Wa ter Supply
litre I 1.8 6 13.1 2
O ut pu t at 30°C 6T
Air I.make Pipe Dia.mere r mm
100 100
Flue Pipe Diumctc:r mm 60 60
Power supply Inp ut
220-240 V- 50 H:t
-
Ma,: . pov;w consu m ptio n Wa tts 164
Leve l of protection rPX4D
5

<.:2 4
C28
(24 kW) (28kW )
330d 33 0d
Case D im ensio ns mm 405w 430w
720h i20 h
Net
weigh t
ks
37 38
Gross weigh l kg 40 41
6

Ftgure 1.
• 2
10
© At
Rear Si de
A B C D
7
Key
I • Fan
2 - Air Pressure Switch
3 -Fan Hood
4 • Prl11l3.l'y Hea t Excbanger
S• Co m bus tionChamber
6 • Tgni
tio nEl oc tr odc
7 . Flame SensorElecuode
8 • .Bum.er
9· O\'erhcat Safety Thermostat
IO- Hea tingSensor
11 - Automatic Air Vent
12 • Pu mp
13· Wa t er Pre~= SwilcivS<: n so r
14 . D.11.1'1. Flow Se nsor
15 • HeatingSafety Valv e
16 - Ons Va l ve
17 - Secondary 1-Jeal Exc han ger
18 . Three-Port Val ve
19 · D.H.W. Senso r
20 - Fi lling Yalve
2 1- DL,;c bar geVhlve(A tt h ebo u omof t hepump)
22 .. Expa 11 sio11 Vessel (At rear ofthe boile r)
23 - Conden s ing U nit
A• Hea tin g Flow
B· O.H. \V, O ut let
C- (ias Inl et
D• Co ld Wa ter lnle1
E• Hea ting Re tu rn
(22mm)
(15nun)
(22mm)
(l5u) nt}
(22mm)

3. Boiler Characteristics.
3. 1 The C24/C28 is a fon tlued, wall -m ou n ted condensing
type com bina ti on boile r that suppJics both cc nm d hcat Ulg and
ma in i. fed d om est ic hnt water. Bei ng room ,,; ea l ed the-boiler may
be
in sLa lled in illl) ' room or ini ernalcompartrnent without the need
for p urp ose ma de ve ntila ti on. A functiona J di agram of rh e boiler's
principal componeDts isgi ven asf,gure I .
3.2 R ange ra 1 ed from 24k\V to 28kW C24 /C28. hea t ou1put can be
foc used to matc h the designed heating systems requirements by
a simple udjm,iment.
3.3 An cl e<:rroni c control t1o it, consisting of a P CB ,vhi ch includes
ignition mo du le provides dire ct bu rner ig .ni tio n and Oame
supervisi
on along with c on l" inuous modulation of th e hu me:r ~ gas
supp ly.
3.4 An in terface: unit, which includes boiler adjustment polc: ntiometers
Md fo :uh display provides easy service ab ility to l he boil er .
3,5 Heattransfer to the
boi ler 's primary hydrau li c clrcuil is obtained
via a primar
y, g.as lo water heat exchanger contained wit hi n a
herme tica llysealed combustion ch ambe r. A 230 volt,singlespeed
fan ex pe ls the prodUQS or combustion from ll.1c com bu stion ch amber
to ouLo;; ide a.fr ,·ia an llS$ocia.ted Oue system. The fa n is ac tivated
atlhebeginning of eachignitioncycle and i ts operati on m0nitored
by means of negativeand positivesensing poin ts co W1 cctOO to an
a ir pr ess u re switch.
8
3.6A secondary beat e."cbang er allows the instant aneo1 1s transferral
of beat from the pr.iruary bydrau lfo circuit to v..-atcr destined fo r
domestic h ot wate r use.1"he seocm clary heat exchanger is siz.ed so
as to minim ise lhe- nnoJ sl1ock andisprotected against the build up
of lime scale by Limiting the D.H.W .oudet water temperature to
a max.jroum ~f 64°C.
3.7 An integral pump located in the boilers main hydra uUc circuit
circul ates w.=itcr through the primary h ea t exchanger ro eitherthe
ccntra) healing c.ircuit flT O.H. W. heat exchanger, depending on
lhe demand. Jn lhe event ofred uced or interrupted. watercirculation
in the cemml beating circu it tl1c prima ry hoo tex ch anger is prote.ctcd
by an automatic by -pass v al ve calibrated to e ns ure a minimum
Oow of S00 -6 00 liL re,./hr. A system by- pai >s shoultl be: fitted 1 ,s far
awa y ftotu the boil er as possible .
3.8 Room tempera tu recan Ix: oont-mllcd by theuse nf an externa l. room
tbenno
sta.t or. a temperntureregulator(Lirnerthe rm ostatwi th output
contact).
3.9 The C.H. sy stem tem pi:ntlurc: 1.:a n be adjusted due 10 uuldo or
tempe rarure byconnectingan OUtdoorTemperature sensordil-«.tly
to the ma in PCB.
3. 10 A1on gwith an integral t im eeonuol to allow th e se.tt in g of central
beati ng period s. tile boiler's control pan cJ inc01poratos a. LED
diagoostic di splay fo ri nd ica ti ng st.1tc of opcr:ll i oo. faul t and <le feet
c:xl<lcs .

4. Operation
4,1 By meaos of a manual fwm jon.switch, l he C24/C28 cau be se t 10
operate in one of w.:o operating modes , do1nestic hot wa ter on ly
ordomestic hotwaterand ce n tra l hcati Dg,
4.2 Dependingondemand, water iolhe primary bydcaulic circuit is
diverted toc jtb er the cc.otral beating system or internal circulation
fo r heat in g the 0.H. W. through th e l)cco nd.ary h e-a texchanger Yia
an electric motor drivenl hree p0rt •,atve situated on the boi lerS
hydra ulicblock. Schematic diagrams shO\\•i ng the t1ow with in th e
boiler's ~ntra l heat in g hydra uli c ckc uit Figure2a a.od O. H. W.
hydra ul ic circuit fi gure 2h are s; i veu .
Figure 2a
9
4.3 DO ME STIC U CIT WATE R MO D E:
Q Whe nhot wa t c:r dc maJJd is requested th e bo il er 'vi JJ fire au to m aticaUy.
An int c,gra l pu,np i, on erg i,ed and hot wa t tr from th e bo il ro prima,y
citcuh isdrcuJated through1he secondary beatexchanger, alJowing
the ins t antaneous transferral ofheat tot.he lDcom.ing cold v.111er. Tbe
boil er'$ electronic am t ro l unitautomaticallymodula te& the burner's
outpulto maintain Ute required t emper'd tu re of the domestic ho t
\\'3 t er. Ho t v.rawr will continue to flow through the rap until no l onger
required. When th e-demand for bot wa terceasesthe.iorcgrsl p um p
and fan will c.: <)ntinuetorun fo rashort wh ile(lOsct:unds) to<lissipale
anyexcess b eat within the boiler.
1-lguro lb

4.4 OOM:ESTlC JJ:OT WATER ANO CENTRAL IIBATL'IG
MODE:
Q Wh~n beating dem~nd is r cq_t»csted the bo ile r wm f lfe a1 1t omaticaUy.
An mtegml pump 1s th en energised and hotwater from the bo ilers
primilry circuit isci rc ulatedaro un d Lhe ce caLral beatingsystems
pipe work and radiators.The bo il er's etec ,tronic control un it
a ut omatica l ly modulates the b uro ct's outp ut toma ttb the h catiag
deman~. As the water temperatur~ of the heating sys ti: m incr ea s es
th e.~ UlJ)Ut. ~o the burne ,· decl'eases , oonservio.g e:necgy and increasing
eft\c1cncy. \\•_Lteo the dmaod for central hea ting is no longer present
the_~umer will sh ut downand the bo iler wi ll revertto stand-b y,
wmung torespond to lhe ei exl l1eat i ng demand.The pump wiU
operate for a while to dissi pa te any excess he a, wi thin the boiler.
10
Adema ud fordomestic hot water v.illoverride the central
h ea ting moct.c forthe period of the r~ ucsr. \Vbcn domestic h.ot
water is no 1 ,on ger req uiredthe bo ilerwill auh)mat icaJJy retum
tothecentral heatingmode or operation wi th or wilhout adelay.
NBA 45 seco nd d<::lay will occ ur before . boil.e r switches back
intocen tral beat in g funcrio .n if the No.3 dipswitch is set toOFF
position.

5. Ge neral Installation
5.J lnJ;tall er 'l'c 5ti ng & Co mmb sioningT ips
• Ins.ta llers h~ll io..'1lrucl th e uScr in lh e operalion l)f the bo il er andt he
saieiy d evices and sha ll give the inst alJation ~servicing and user
iostroctions to the user after insta ll ation of t'b.c boiler.
• The user sho uld be in structed Lo kt:e p Lhe serv icing in ~tructions in
a sa fe place .
• It is i mportant to keep the · bo ilerclear of dust during the installatio n.
In parti cu l ar, dono, allow debris to enterthe t op of the boi l er where
the
Oue .connection is m ade.. Thismaycause the fan outlet LO get
blocked or comb us tion chamberto fill with debris and w i.Ll , of
co u rse, cause the boiler to fa. ii to igniteon fmt ign i tion . It is
reoommt:ndcdth al you check the fan o utl et before you light lh t:
boiler.
• It is im pomint that the boiler must be used in conjunction w hh a
Heat Line opprovcd RU'.: .
• The flue oo nn ec: Lions sho uJ d be scaledproperly.
• Before yo u fit d> eboiler ensure that the pipe 1.vork tl>Zlt you are
inst3ltillgis connected to the ·appropriate·con»cctlonson tbc boiler
i .e . etl ld wll1c..'-f pipe to cold wa(cr inlel, hol water outletto Lhe hot
water tap .
• Because th e bojJ er is liv >ll ,est ed. attheend of each productio 11stage.
asn ua llamou nt of v,atcr wi ll re mai n withinthe boi ler. Please ensu re
Lha l you sp in the. pu mp rotormanual ly befor.e ignition.
• Remember to f.lush out tbesystem. both co ld and hot . in orde r to
remove the dcbri.s from the system. Th.is sboold be done particularly
whereboilersan: being
fiue<l Lo e1t -i sling radiatorcircuils.
• Remember to re lease the sma ll cap on top oflhe auto air purge
device onthepump, I tum, before fillin g. This v.ill ens ure thatair
is removed a:; thesystem stans up.
11
eDo no t use the pressure rc li efv111vc as a mcan.s of flu shing th e
sys lern , please u.~ the \• aJve at thebo ttom or lhe pwnp. Di sc h arg ing
v.~ t er from the system from the pressure relief valve may allow
water t o~ after you h,1vc left the job,so tb .is may cause the bo iler
to losepn:~ur.e and d~bris to collect on lhe St.-at i.n g.
• The
bo iler is finedwitha cold water iti.let. filter on theinlet. S: ide or
111 0 hydrau l.i c block. Ifthecentral heating worl<s but you are unable
to obta in O.TC\ "en fire the boiler in h ot wat c (" mock, it is h ighly likely
this filte r is blocked lf youareable too bt ain hoty.ater but no ce otml
heating, t
hen it isadvisable. in first instancet tocheck the clock
oonJtoct ions, ch c room stat is ni mcd up fully and theclockb as been
setto call fo r heat.
• Do not forge l that ,vhen domestic hotwaterhas been r eq u ested and
if No.3 dip sw·itch is 5ci toOFFposition, a45-second time d .e l ay
will clapi;c before the ce n tra lheating fires when in ceotr al heating
mode.
• When commissioning rememberthat the bo il er requires20 mbar
gas "'-orking pressure arthe inlet of theapp li a nce gas va l Yc .
• Between two
ce ntral heat in g demand, the timecan beadjustedby
Anti Cyc1i1ig Time ad ju stment tri m1ner .
If yo u arc inany doubt, please refer to theinstallationand comm. i ss-ic:mi ng
guidelines
contaimed wi thin theboiler instru ct ion rnanuals. Ir necd~ r y,
please c on t act Heat Line rt •t Servk.e Enquires for further adv ice and
assistance..

S .2 The C24/C28 is ~u itable for use onlly on fully pumped,
pressu ri sed, seu t ed iys t ems 0perating witha m.aximwn design now
temperature of8 ;< 'C.
5.3Th~ bo il er·s inlcgr al expunsion ,•es sd is p~- char g. ed lu a pressure
of 0.5 bar and will ac.c.ommodate asys te m "ohune up to .1 25 litres
for an average wator temperature of 75t'!C and m..1xirn uru. system
pn:i;sure of ~ bar. lr, when operating at maximum design A_ nv:
temperature, the s ys1em pressure is greater tha n 3 bar then au
additionaJ expans ion vessel nms1be fitted to the system .A ty pical
inst.1. lladon of anadditionalcxpa1ision vessel is gi vcu asfigure .1.
Boil er
~ C i>kl W 4',«
i llR) ljl
M4,ki n111
-
1:, pn 1u1n n
t + ,:.,,..1,01 ~:sstl{
iC
l). 1m t1-Ci.- l ~"'C W Iii «
,ah,:
rc.; 11 i r,.. JJ
-! 0
flni 11 i '
By:,asJ
'
i!,,;.v,«' '
Vlll\ 't
'
Hc.11 .... i:<1 111 11.! 1
~
'
~ ---------------- j
l· .b'II.•
, ..
co nt rol
'
oo m .:rol
\ 'f. l•\: ' ~OIH~
llt 111 int R:c- 1,m
12
5.4The S)'$ 1c m p, i pcw Q rk layout mu !)! he si 7,cd anddesigned to ensure
a mi nimum Oow rate of 1300 li1r eslhranda maximum differential
of21Y'C across th e boil erflow and return pipes.
S.S Ex isting h eat. i ng: sy st ems mLL'i l be Lho roughl)' flush~ inaccor <lance
wi lhtherecommendationsofBS7593 priorto installing tlle boil er.
5. fi 'r he syskm and boiler sh ou ld he protectc-d by a suitahl.c ant i
corrosi on innibito r.
5.7 On insta lJ atioo it roust be ensured that the boilc(s beat cx cb.angcr
is nu l a natu ra l oolle ct i ng puinl for air and wh ere pu, -.si bCc, the
system pipe,.;vork should ha\'e a gradient 10 e ns. ure air is C3tried
naturally to other purpose made, air release points.
5.8The system's watermust a1" ' ays be aU~d lO circulate when e\'er
t he circulation pump is runni ng . A return by -p ass or a no n-
thermostat ic radiator mus tal ways be provided in zon ed syste- ro s
andsystemswithlhermosh ll~m troll e<l nulil!l.ur valves.The s.yst'.t:m
by.pass should be fitte d as fa ro way ffMI Ille boile .r as poss ib le .
5.9T he n:: li cf va l.. ·e discharge mw.t hedirected away from any electrical
component or where it cou ld cause a ba2ardous situ.1 ti on.

S.JO To e nab le correct draioage of cJ,e syslem draincoc ks to BS2879
must be fitted
to t he lowest poiors in rhe sys te m pipework.
S.11 Fo roorrecl domesljc hot wa te r a ppl icaliot, the incoming water
s up ply connectio n to the bo il ershould be the ficst from the main
aod capable- of delivering a mioimu ro inlet prtSsurc of 0 .2S bar
and now rate: o(2 ·5 litres/m in ute. Where inlet pn: ssurese)(ceed
8bar,a pres sure regulator mu stbe fined to thecoldwatersupply.
S.ll Where co1d wat er m1tin s arc fitted w it h. a water meter, check
... a lv e(s} or loose juniper Slopcock, a domestic hot water mini.
expansion
\.'essel should be fitted.
S.13 AJth()ugh the C24/C28 is d~~ igned tu inhibit lhe fonnatilm
or sca l e, in ha rd \l','<l.ter areas above 200mg:litre,a prop ri erary sc al e
reducer s ho uld lx: fitted in tbc co ld water supply to the-boil er ,
S.14
To ens ure econo mi cu se ofdomestic hot w· ,u er, il is recomrne n ded
that pipe nms be twee n tile boilerand taps be in J 5mm coppe r, as
s ho rt as possible aod where practical, be i. nsulatc d to rcdu oc beat
loss.
5,15 lftbc boiler will not be used for a lo ng pe 1i od and there is ri sk
Q( fn:c:r..ing~ theelectricsupply mm ,i be lei\ONanda ll the central
heat i og isolation v-al~ must be open.T he n lh e. boiler will perform.
frost protectionsystem. Otherwise, ifthe elect ri c s up ply,vjU be
turnedoff. central hcatiog system and domestic hot wa ters ystem
m uS I bt d r.iine1.L
13
6.Appliance Si ting
6.1.1 The C24:'C28 bo iler may be i nst alled in a ny .room or
internalcompanmcnt and rcq ull';;s no purpose made ventilat io n
for combustionai r. rrlhc:-hoiler is lo he si ted in a n"lur nconl.aining
a ba tll orshow,r tl>en parti c ular reference is drawn 10 t ile current
regulatio ns.
6. 1.2 TheC24/C28 bo il~ musl be in,; taU edinaruom whichhas pu rpose
mad e \.'ent iJation for combustion air.
6.2The bo i lc: -r is nol suit.able: for external in stallati on u nl e.,;i;, pro ted c: d
by a purpose ma.de buil ding suc h as a boiler b.ouse.
6.3 Po r maintc. na nce pur po&es the hoiler must be in stalle d ..... ·ith a
minimwn d~arance or200 mm above, 300 mm belo w, 600mm to
tbe front and 50mm to e ach sjde of the boiler case .
6.4The
bu iler mu '>l be sited 1t l l ea.'> t Im away fmm fla mm able ma: terials
and heatsensi1 l\ •e ¼-alJs mus, be protec f ed by appropria1e i nsuJario11 .
6.S The ha il er mu st only he mounted on a Wllll that is capable of
supporting lb e boiler's we igh t.
6.6 'lb avoid
cxc-:~sivc condensationoccurring wit hin th e boiler flue
the bu il~ should when:ver pu s..,ib le,be sil c:d tu c:nsure thi: shortest
poss
ib le fl ue nm is Ulilised.

,6 .7 .Fo rco mp..Wmcn t ins ta ll atioo the rcquircmeu ts of below must bo
metin particu la r:
0 The compar t menl mus t be of s.uffieicm size to per llli t access for
in ~"tio nandsc:rvidng or the remO'l/8J of the bo ilerand a: nyan c-i ll ary
eq uipment.
OAnyspace used for airing c-lot hes or storage IJl USt beseparated from
~h e ap pli ance by a non-comb m,1ib le partitin n. Where the piutiti un
LS foroted from perforated material, thenthe!lllajordimension of the
aperturesshall no t e, xceed 13 mm.
O Where I.be boiler~ flue pipe pass;es through theairing space, il must
be p ro tec,ed by a uoo ~c ombustible sleeve. or fire stop 11.. l\'ing a
m in im um tl earanccof2.S mm between I.be flu epipe and sleeve. lo
uddi.ti. un , the clcarnnc::c g.u p of the flue pipe or its guard th ro u gh th e
part tt 1o nmust no t exceed 13 nun.
0 N~ c:ombustihlc su rface: m uS,t be within 75mm of th e: boil er casing
wit ho ut pr oteci-io n.
QA mi nimumcl C'3rane oo f75 m.m mustexist between the compartment
doorand bo ik- 'T front.
'6.8 Where the boiler is in 1cu ded for use on Propa ne gas the boiler
must not be: in stalled in a room or int cmRI space below ground
leve l.
14
7. FlueTerminal Location
7.1 Th e flue tc rllliuaJ mus t be sitedw ith. m ininn un ckara.oce djstau ces
3S spocifi cd in f.'igure4.
7.2 \\' h ere thel owes t pa n or t he llue tennina te s be l ow 2m ab o, •ea
b alcooy, Oat ro of or ground Je vc l, the n an approp ria te termin al
guard s. ho u1cl he fi tt ed in ucco r dancc w it h sta ndard F.N 4 ~3 and
BS 5440.
7.3 W'hcrc th e flue tcr:roinatcs within 1 ro of a pJ asticor 1,aint od gu1tcr
ur within 500 mm of painted c-.uves then protection should be
provided i.11 (be form of au alwni nhun shield at least Im in leng tJi.
fitte-d to t he underside of t he gutt er or painted suiffoec.
7.4 The Ouete rmin al s hould not be.s it ed "t\ 'berc. con dc nsate 'p, Jun1e i
may glve rise to a nuisance factor under ce .r ta ln wea ther
~osd i tio!!.$ ,

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A- Direc1lybelow an openab
1e win dtm or Ol h er opening e.g. air bri ck
B-
Below guners,soil pi pes ordrain pipes
C-
Below caves
D- Below b;ilconies(lr car front roofa
E- From vertical drain pipesandsoil pipes
F·
Fro m internal or external co rners
G- Abo \'c g i: ound, roof or ba lco ny 1c.,.c: 1
II-
Prom a$Urface facing a lc:rm in al
I-
From at erminal discharging 10,w1rds an other ten ninal
J.
From an opening in a c ar port (e.g. door, wiudOYt·) into a dwe lling
K· Vert i cally f rom a te rm inal on the same wa ll
L-
UorizotltalJy froma terminal onthe san le w nU
M·
Above an opening. airbrick, open.iug windows ,et c.
N- Horizon t ally to an opening, air brick, op eni ng wiodc.w;s ,etc.
p. Abo\·e rooflevel(to base.
of 1em 1 in ..al)
Q· F
rom a dja cen twall to flue
R·
Fro m an adjacent opening window
S- F ro m anothert c:nn inal
15
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Internal Co m er
F i
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MI N IM UM
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DrSTANCE
JOO mm
75mm ExtamaJ
Cu r.ner
200mm
200 mm
LSO m1n
300mm
300 mm
i F
600mm
1200mm
1200mm
( I '
1500mm
300 1nnl
300mm F
300 mm
300 mm
300mm
1000mm
600mm Double
Comer s

8. General Flue Info
8. 1. The C24/C28 boil er empl oy s a couce ,u ric nu e arran ge m enc
consisting of a 60mm-diameter inn er th1 e du a and 1 00mnHliameter
ou te rair inl et duct.
8.2.A standard 705 mm fl ue kitlf,gure5) is suppl ied with the bo il er
'" 'ru cb can be ro uced to th e r ea r, l eft or right of , he appliance by
means of a 90 degreebe nd . Thebe nd iscoonectcd to the boiler b} '
means of conncelion scr ews .
058160
0981100
Fig.5
1Ll. 1' he t1 uc m ay he lengthened,h)' means of extensions( 1wailah lc as
nn opt io nal e~ tr a), to a ma x imum hori20n tal l engt h or 3 metro ~
us in g 60/1 Oil flu e pipe .
8.4. An opt ional vertical nue J.jt is avail ab le tu ,a m ax imum le-ngth uf
3 m eues us. i.og 60/ 1 00 flue pipe. The toofterminal is ap p ropiace
for fl at a nd pit c hed roo f.
16
8.S. Jf horh::o ota l and vertical flu e lengths arc l ess than I ro, th e
flue rest ric t()r (d i ap hrag m) must be: fi tted on the fan outtlet of
combination boiler. (flgurro· 6a, 6b und 6c )
Figu re 6c
8. 6. The con nection of vertical tl ue syste mis sim ilar to the H ori2on tal
t1nc conooction.The sys tem is coonoctcd vi aconnection screws.
8 .7. To avo id co :nden se O ow fog ba ck ii llO tJ1 e eo iubust iou cha mber,
the tl ue should be insta ll ed with an u pwa rdgradient of 3degrees.
Note. Fo r eac h a<lditional 90° dhow (or tw o 4S
0
dhows) used
the maximu m flue le ngth m us t be re du ced by 1m.

9. Electrical Connections
9.1.1 The C24/C28 is supplied factory w ire.d co mp let e with
J .5 mof main s f1y l ead .AUelectrical connectioosto the main s
st 1pply must be made in full accordance with the current
r
eg ul at ions. Tb c mui ns fly lead m ust be up to 1.5 mby th e
ins (al ler.
9.J.2 l' bcrc should be electrical powc.r sup ply within 1 meter.
9.2 T he boiler must be co ,rn ect ed to an elfecci,•e earth syst em a J1d
conu~ te d via a double pole isolating switch fused to 4 amp or
alternatively, by the use of a 4 aoop fused t hr ee pi o pl ug and
un.sw ilc: . bed shutter~d socke t outJt:t provi di ng Lh t: b oile r is n ot
i nsta H ed in a coom containinga bath or s1l0\\-e r.
9.3T he .po in t of connection mu:, ,1 beread il y accessible, adjacenttQthe
appliance and provide complete electr.ical isolation for the boiler
a nd control syste m.
'9.4Onoom,ec.ti un ofa n)(Hn thenuO$ilal to th e bc ) il er ~dle factory filled
b rid ge ac rossthero om t hei· m oita t terminal connec to rs(figure 11 )
l\l\1St be remov ed. The connection s bow:n in the figure is low
vo ltage.
9.S On connec ting to the m ains el ectri ca l st1pply it is ess ent ia l that the
cor rect polarity is obscrvocl . Tf pola rity is r:csc r vcd, the boiler wi ll
op c:r ate but afier a while ii can ca u st:: prl>b lem.s on ·pen.
9.6W hil e.theboiler's ma iD PCB, pw :np , fa n. thrcc- ,.,,11y vah·c andgas
\'ah·c
are s upp lied ~l()V AC, 1111 oth er corrrp c,nc nts and associa lc d
circ
uit s are sup plie d 0 11 extra I O\V vo ltag e.
17
Figure II
Wll h100 1n
lherhlOStlll fined
00
9.7 On C<)n11ect i 11g the rnair lS deccrieal supp ly 10 Lh e bo il er. il i s; esseri ti a1
to ens ure that electrical safelychecks tb r eanJ.1 co1 1t inuity~ ea rth
rcsistan~ o. polarity Md shortc i.rt u it a.re ca rrie dout p ri or to 1JJa kir\g:
th e.linalconnect ion. A tli ag mm of the boiler'selec tri calcirc uit i$i
gi ve nasfiliwrt 12.
Warning:0 11 ou UCl."1mnt- mus. t anyCXk.'t'1 11d \'Olf.11{,.f\' be i;ip1,lll..-d
to any of tbe terminals on the beatlng c.ontrol conncct1on
plug.

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Figu re 12
18

Im portant Nore.,
l'hc main~cl c...-ctrlca l sup ply tQ lhc C24/C28
m11st be majntained at a ll times in o rder lo
provide pu mp an d th re e potc Yal1,·e anti·
bl ockiog and fros t p ro tection. Ens u re thatthe
bo il ers de ctri cu l$Upply is 11 01 int c:mJ pted hy
at -i y e :<.t e rna l oo mro ls.
19
10. BoilerInst~llation
10.1 Pr ior to i ns ta HinG t he C2 4 /C28 boile r
che -ck that the appliance ca non c,ontai ns :
A pp lian ce .UserM ao ual,w all hanging braek <I ,
mountin g: templateand instaltation aeoc s wri cs.
ll) e bo iler dimen si o ns are given in fi x11r e 13.
Dimension C24
<.:2 8
A
40S
430
B 169 169
C 60/1 00 6011 00
f 39 64
(1
64 64
10.2 Ensure tha t the boiler is suit .ab le fu r th e g as
supply by checking the data pla te situ ate d on
the in.side of the controlp aoc l door,a nd thatthe
~y stc m. and cho se n bo iler positi on is in
acc or d anc e lO S ec tions I, 5, 6 and 7 of th ese
instructions.