chaffoteaux ltd. c%%iiii~
CORVEC BRITONY II
CONFORMS WITH EUROPEAN STANDARD EN.26
Page 3 : TECHNICAL DhTA
Pages 4. 5 and 6 : IXSTALLXTION
Pages i. B and 9 : SERVICING [SSTRUCTIONS
Pages 10 and 11 : F.4ULT FINDING CHART FOR CORVEC BRITONY II
Page 12 : SHORT LIST
e CORVEC Britony II is a balanced flue instantaneous gas fired muitipoint water heater. Two models are available,
_ ,rorrnai pressure version for direct connection to the mains coid water supply and a low pressure version for connection
to a coid water storage tank.
The CORVEC Britony II does not require any purpose provided ventilation unless installed in a compartment. A
compartment enclosing the heater requires high and low level openings communicating with outside air or the room in
which the compartment is located. The free area of these openings must be :
High Level Low Levei
Air from room 102 cm2 (I 5.8 in2) 102 cm2 (15.8 in2)
Air from outside 51 cm2 ( 7.9 in2) 51 cm2( 7.9 in2)
The installation of the heater must be in accordance with the relevant requirements of the Gas Safety Reguiations,
Building Regulations and the Byeiaws of the local Water Undertaking. It shouid also be in accordance with any relevant
requirements of the local gas region and iocai authority and the relevant recommendations of the following British
Standard Codes of Practice.
CP 331 Installation of pipes and meters for town gas
Part 3 - Low pressure installation pipes
‘CP32 Selection and instahation of town gas hot water mppiies. Pati 1 - Domestic premises
-5440 Flues and air supply for gas appliances of rated input not exceeding 60 kW (1 st and 2nd family gases)
Part 1 - Flues
Part 2 - Air Supply
.YA’l-C’RAL c;,\s TABLE 1
Heat mput Nominal. ........................ 30.27 kW 103.280 Btu/h
Heat output Nominal ....................... ”
m-.70 kW 77.450 Btu/h
Gas rate (maximum) ........................ 3.81 mjih 99.24 ft3/h
Burner pressure ........................... 15 mbar 6.0 ins
Main burner mjectors marking &. ................ 113
Pilot injector marking ....................... 23
Water flow rate . raised 500 C (900 F) ............ 6.5 I/m 1A4 g.pm.
Water tlow rate . raised 300 C (540 F) ............ 11.l I/m 2.44 g.pm.
Minimum operating head for normal pressure ........ 10m 15 p-s-i.
Maximum operating head for normal pressure ....... IOOm 150 psi.
Minimum operating head for iow pressure .......... 3.5 m 11Jft
Maximum operating head for low pressure .......... 8 m 26 ft
Note : The minimum water pressure is for the correct operation of the heater only. An additionai allowance
must be made for the resistance of the pipework and fittings particuiariy where showers and washing ma&&a
are used. This should be the equivalent of 2 m (6.5 ft) head.
Water iniet .............................. Right hand connection 15 mmcopper
Water outlet ............................. Left hand connection 15mmcopper
Gas ................................... Centre connection 15 mmcopper
Height ................................. 655 mm 26 in
Width .................................. 395 mm 15.5 in
Depth .................................. 253 mm 10 in
Weight ................................. 19kg 42lb
Spaceforftig-Top ....................... 65 mm 2.6 ins
Space for fixing . Bottom ..................... 178mm 7.oins
Space for fling -Sides ...................... NIL NIL
Spaceforftig-Front ...................... 152mm 6.0 ins
HOLE FOR WALL LINER
Width .................................. 305 mm 12ins
Height ................................. 205 mm 8ins
Standardflueset .......................... 75-355 mm 3.14 ins
Optionaiflueset ........................... 75-610 mm 3-24 ins
NB. The low pressure model does not have a temperature selector knob
rile CORVEC Uritony 11 is supplied in two cartons. one :\ minimum ciearance or SO mm t 3.2 in) should be left
<ontamtr;c LilL’ heater. the other contammg the balanceu above the top edge ot‘ the wall openmg. For dimenstons and
tlue ser. ilearance see Page .! 2nd fechmcai Data. Puge 3.
Slide thi: wail liner through file wali ensuring that it is
horizontal and chat the tlanged end is flush with the face of
the lns~de w;lil. Trim Lo length LI ncces=ry. so that the
INSTALLING THE B;\LANCED FLUE outer end of the duct IS tlush with the t’a<e oi the outside
nle srclndard flue set IS sultabie for walls havmg a thickness wail. Make good around ihc wall liner 11’necessary (fig. 1).
0i 75 mm (3 in) to 355 mm (14 in). Xn optional flue set N.B. For walis oi between 75-100 mm (3-J in). turn the
<or wali thicknesses up to 610 mm (24 in) IS avatiable to wall liner hooks down through 900
Detaded recommendations for tlueing are given m BS
5440 : 1. The foilowtng notesare for generai gutdance oniy.
The heater must be installed so that the flue termtnai is
exposed to the external air. The heater must not be ins- FI’I-I-ING THE FLUE TERMINAL
talled so rhat the terminal discharges mto another room or The flue terminal may be fitted trom mslde or outside of
space such as an outhouse or lean-to. the building by fixing the two sprmg loaded chains over the
rmmatlon should be on a clear expanse oi wail. the hooks on the instde of the wail liner (fig. ‘1.
termtnai preferably being not less than 000 mm 1.I ft) away Where the termtnai is to be m&led from mstde the buil-
from a corner. recessor projection. ding. it can be passedthrough the wail liner and pulled back
into posltton by usmg the chams. Where this procedure is
DO NOT install the terminal : used it must be ensured that there IS no risk that the
a) within 100 mm (1 ft) measured vertically from the terminai can fall. It is recommended that a length of cord
bottom of sn openable wmdow. air vent or any other or string is fiyed to the termmai to prevent any risk of
ventiiation opening. damage to the terminai. the building. or to danger to
b) within 300 mm (1 ft) above adjacent ground level. persons tn or about the building.
c) within 600 mm (2 ft) of any surface facing the terminai.
d) immediateiy beneath eaves or a balcony.
Where the lowest part of the terminal is less than 2 m
(6.5 ft) above the level of any ground. balcony, flat roof or
place to which any person has access,and which adjoins the
wail in which the terminal is situated. the tet-mtnal must be
INSTALLING THE HEATER
protected by a guard of durable materiai. (A terminal guard
is avaiiable from Chaffoteaux Limited). The heater is attached to the waii by .?studs at the top and
The air iniet. product outlets duct or termmai oi the heater two screws at the bottom. .A further optronai top fting is
must not be closer than 50 mm (2 in) to any combustible provided for instailations where the waU adjacent to the top
tertal. Detailed recommendations on the protection of fixing hoies is of less than sound construction. The fig
,umbusribie material are given in BS 5440 : I.
conbustible studs. screws and optional cop bracket are packed witk
the gas service tap and a foam gasket and placed in a box
PREPARING THE WALL which is found inside the heater.
The heater should be installed on a wall of flat non-com- Remove the front case of the heater by pulling off the gas
bustible material that w-ii1 not reverberate. Whatever the control/temperature control knobs and unscrewing the
thickness of the wail. make a hole 305 mm ( I? in) wide by three ftving screws at the :op. bottom and between the
205 mm ( 8 in) high. If the hole is cut accurately there is no control knobs. Pull off the front case taking .care not to
need to iine it as the wail liner will seai off the cavity. loose the rubber spacer behind the centre fixing screw.
Fig. I pie. 2 Fie. 3
Remove the tiue bend from the top of the heat exchanger Distance t’rom Meter Gas Supply
hy reieasmg the t‘ixing clip and removtng the two screws. outlet to heater
N.B. It’ ihe oprionai top fucing bracket IS to be used this O-3 m t O-IO ftl IS mm
Aouid now be attached to the top of the rear case with the 3-20 m ( IO-65 ft ) ‘2 mm
screws aiready ritted to the case(fig. 3). 20 m and above contact British Gas
Using the heater as a template. locate the spigot oi the
qpilance III the wail liner. check that the appliance is These sizes are for the heater oniy and do not take account
vrrtlcal 2nd mark the four or five fiiing holes. Drill and of any other gas appiiances that may be connected to the
piug the wail and fasten the top studs in position. These same gas servtce pipework.
studs can be screwed into the wall by locking two nuts
together on the parallel thread and using a spanner. WATER CONNECTIONS
Remove the plastic covers protectmg the water inlet and
.-\itach the seit‘ adhesive foam gasket to the flat surface oi Fit the water service tap provided to the right hand connec-
the heater around the air inlet spigot of the rear case. tion at the bottom of heater usmg the coarse Mter washer
Remove the protective paper whiie sticking down the gasket. to seal the connectlon.
Lift the hearer into position on the wail. locating on the
stuc1sand the wail liner. Secure the heater to the wail using
*he nuts and screws provided. The hooks fit under the Fit the 15 m dia. copper tails and washers provided to the
;IIJCS the top iixing studs (fig. 4).
or’ inlet of the water service tap and to the outlet of the heater
(left hand connection 1.
Trxnsrer the termmai fixing chains from the wail iinet to
these hooas. T’he termmai chains should not be left fixed The water service tap supplied with the heater incorporates
to the wail liner hooks. a drain plug.
Slide the rlue duct through the rectangular hole in the rear
case and engage into the central spigot of the termmal so
that it touches the two end stops. Refit the flue bend so
that the flue duct engages by at least 25 mm (1 in). it may
be necessary to cut the flue duct to the correct length. and
ensure that the flue bend is seated correctly on the heat APPLICATIONS OF THE CORVEC BRITONY II
exchanger with the gasket in place. Replace the two screws
and clip securmg the !lue bend. The heater is designed to serve a variety of hot water draw-
off points including washing machines and showers. The
Do not refit the front cover until the appliance has been
heater can be connected to all the hot water drawaff
points in the installation. but it should be appriciated that
depending upon the temperature seiected. the water flow
available wiil normally only be sufficient for simultaneous
drawaff at a maximum of two points.
The heater is compattbie with most current automatic
washing machines. but care should be taken to ensure thab
Remove the piastic cover from the gas inle; which is the
,<emove the machine is capable of accepting water at the design
centre connectlon on the bottom of the heater. flow rate of the heater. Hot and cold fii machines normally
Fit the gas service tap provided using the fine filter washer require a hot water temperature of 600 C (1400 F), the
to seai the connection. Fit the 15 mm dia. copper tail nut heater producing approximateiy 6.5 i/m (1.44 gpm) at
and washer provided to the inlet of the gas service tap and this temperature. (he advice of the washing machine manu-
connect this to the gas supply. facturers should be sought, but generally it is only neces-
The size of the gas supply pipe from the meter to the sary to remove the water flow restrictor (if fitted) in the
hot water inlet connection of the machine to obtain a
heater oniy should be as follows.
satisfactory heater operation.
TO COLD TAPS
Contact C‘haffoteaux Limited for detatis of those machines Turn the gas control knob fully anticlockwise to the main
known IO be compatrble with the CORVEC Britony il gas posttion. if the piiot IS now extinguahed for any
The heater can be used to supply hot water to a separate reason. return the gas control knob to the off position and
shower draw-oii. The heater should not be used to suppiy watt approxnnateiy 30 seconds for the safety interlock to
more than one shower mixing valve. but can supply two reset Itself.
shower heads oif a singie nuxing valve. The recommended
pipework arrangement tbr a smgle shower head is shown Turn on an adjacent water draw-oif pomt. the heater will
in fig. 5. Only those .‘ittings detailed should be used with now light.
the heater. Chaffoteaux Limited to not supply the water
governor or any shower fittings. For local supplies of
these piease contact :
Water Governor Dereve (Flow Controls) Limited. Check the burner pressure by fitting a suttable gauge to the
Unit 1 1. Middlemore industrtal Estate. pressure test point on the end of the burner manifold. The
Middlemore Road. Smethwick, Warley, correct pressure is given in Table 1. Page 3. If the burner
West Midlands pressure is not correct. check that the pressure at the gas
Tel : 021 520 1337
520 1337 tap test point is 20 mbar (8 ins w.g.) with the appliance
operating. If the inlet pressure is not correct. check for
Shower Accessories Walker Crosweller & Co Limited, 1 any possible blockage or restriction UI the pipework to
Whaddon Works. Cheltenham. the heater. If the pressure cannot be corrected contact
Gloucestershire CL52 SEP your local gas region. The heat input to the heater is preset
Tel .0’42 27953
. - and non-adjustable.
For the low pressure model. adjustment of the water flow
rate is necessary. With the burner pressure checked as
before. adjust the water throttle (fig. 6) to give a temp-
Do not use the heater with push-on hand showers that fit erature rise of 500 C (900 F). Screw in to increase the
over existing hot and cold water taps. temperature and out ot decrease it.
Remove the gas control knob.
Replace the front cover ensuring that the rubber spacer
PIPEWORK is in place behind the centre fixing screw. Refit all fixing
screws. Replace the gas control knob and temperature
The following notes are for general guidance only. control knob ensuring that the knob indicates “hot” when
turned fully clockwise.
6) the heaters performance may be affected if the
installation has old pipework forming dead-legs or air Hand the User’s instructions to the consumer and instruct
reservoirs. Always ensure that any old pipework is in the correct and safe operation of the heater.
either removed or capped off immediately adjacent
to the pipework that will be in use.
(ii) the size of pipework between the heater and the
various draw-off points should be sized to ensure an DRAINING THE HEATER
adequate flow at all draw-offs when used individually.
If the heater is not to be used for long periods it is recom-
mended that it be drained. See the Servicing Instructions
for how to dram the heater.
PUTTING INTO SERVICE
Open the gas and water service taps beneath the appliance.
Purge the gas and water supplies. Check for gas and water
soundness at all heater and extemai pipework connections.
Fit the gas control knob and light the pilot by turning the
knob 900 anti-clockwise. it may be necessary to purge the
pilot gas suppiy, if so, wait a few moments. return the gas
control knob to the off position and repeat. (The pilot
supply wiil only purge when the gas controi knob has been
turned 900 anticlockwise).
Before commencing any servicingwork. turn off the gas Rep&e in reverse order making surethat the gasket bet-
and water at the gasand water iniet taps on the appiiance. ween the burner manifoid and gassectionis in placeand
that the burnerheadassemblyis correctly locatedon the
two spigotsat the rear.
RECOMMENDED SERVICING SCHEDULE
For efficient and trouble-freeoperation.it is ret&mended 3) HEATING BODY
that the heater is servicedannuaiiy, The following work
shouid be carriedout by a competentperson. Removethe flue bend from the top of the heatex&an-
ger by ,removingthe clip gnd the fwo fixing screws.
0 Cleanthe burner the flue bend off the heat exchangertaking carenot to
ii) Clean the heating body (In hard wafer areasir may damage the sealing gasket. The heating body can be
be necessary descaie heating body)
fo the exa&ed in posirion, and if external cleaningis s&i-
cient, remove the burner and clean the heat exchanger
ii) Cleanthe pilot and thermocouple with a soft brush.detergentand hot water.
.V) Cleanthe gasand water falters
To remove the heating body for further cieaning,the
“) Cleanthe water governor heatermust first be drained.
Change diaphragmeverythree years
Turn off the wafer iniet tap to the applianceas before
and open an adjacenthot water draw-off point:Remove
1) FRONT CASING the drain plug from the side of the water inlet tap
(C - fig. 8) and drain the water from the heater. Alter-
To remove, pull off the gas control and temperature natively removethe wafer governorplug (D - fs. 8) from
control knobs. the baseof the wafer section and drain the water from
Unscrew the centre futing screw between the control the heater. Replace the drain down valve and/or water
knobsand the top and bottom fixing screws. governor plug before proceeding.
PuII off the case taking care not to loose the rubber
spacerbehindthe centreftig point. Removethe burner (seesection 2)
Remove the screw holding the bottom of the heating
body skirt to the rear case.
Unscrewthe pilot tube clampingscrew(A - fig. 7) and Releasethe two union nuts joining the heating body
removethe clamp and tube. legsto the wafer section.
Remove the burner manifold by unscrewing the two Removethe heatingbody.
screws - fig. 7).
In hard water areasit may be necessary descaIe the
MI burner head assemblyforward to remove, taking heating body. Use a solution consisting of 5 parts
care not to trap the thermocouple or igniter wires. water to 1 part hydrochloric acid. The water should
The burner head should be turned upside down and preferably be hot - ADD ACID TO WATER NOT
cleanedby brushing. WATER TO ACID.
Fig. 7 Fig. 8 Fig. 9
[‘ill the tmtmg body with this soiutm ami leave unrd 6) SPARK ELECTRODE
ttlc soiutlon stops bubbling. Flush out the hcatmg body
rilorouzidy bciorc rctitting to the heater. Remove the burner. XC &XLIUII .!.
W,ARNINC - \CID/W.ATER SOLUTIONS \lUST BE Remove the ciectrodc t’ising screw (J - fig. 1 I) with a
USED WITH E!CI-REblE CAUTION. T,AKE CARE NOT screwdriver placed inside the hcstmg body skirt.
TO SPLASH THE SOLUTION ONTO SKIN OR INTO
Pull ol‘i the electrode cable t‘rom the p~ezo cartridge.
THE EYES. WASH ANY AREAS AFFECTED WITH
LARGE .4310UNTS OF COLD WATER AND SEEK Lift the eiectrodc out 01.the gss sectIon.
Reassemble in reverse order. and note that the slot in
Re-assembie m reverse order ensuring that the skirt the connector on the end of the electrode cable is
t‘ixing screw and reinforcing strip arc m pisce. vertical when pushed onto the cartrIdge.
7) THERMO-ELECTRIC VALVE
Unscrew the pliot tube ciamping screw (A - fig. 7). and
remove the ciamp and tube. To repiace. remove the thermocouple nut (G - fig. IO)
Blow through the tube to remove any dust. Unscrew cap from the side ot‘ the gas section and with-
draw the thermo-electric valve.
Remove the burner (see section 1).
NOTE : This heater is fitted with a safety interlock.
Unscrew the knurled pilot burner outer rmg (E - fig. 9).
When the pilot is turned off. the heater can not be relit
Unscrew the piiot body (F - fig. 9), with a 15 mm until the thermocoupie cools down and the lighting
spanner. Clean by blowing or washing in water. Do sequence is repeated.
not clean the holes with a wire.
Blow any dust out of the gas section.
Re-assemble in reverse order.
8) MAIN GAS VALVE
To inspect and clean. remove the burner (see Section 2).
Disconnect the thermocoupie and igniter lead (see
5) THERMOCOUPLE Section 5 and 6).
Remove the burner. see Section 2. Remove the four screws iastenmg the top of the gas
section to the base (K - fig. 12) and the two screws
Remove the pilot. see Section 4. at the back (L - fig. I?), holding it to the rear case :
Unscrew the thermocoupie nut (G - fig. 10) from the Lift the gas section top oif the base.
thermo-electric valve and remove it from the wire.
Remove the complete gas valve assembly by unscrewing
With a 7 mm box spanner. unscrew the nut (H - fig. 11)
the brass cylinder that has two flats.
holding the thermocouple into the gas section.
Thread the thermocoupie and wire up through the gas Dismantle the gas valve assembly by unscrewing the
section. hexagonal spring retainer from the top of the assembly.
Remove the spring and gas valve and cleah the valve
Replace in reverse order. seating.
!ieplace c/11’ valve lacing rubber and gas valve assem- (Jean tjlc t‘ilters t)y blowmg or washing in water. DO
bly “0” ring 11‘ NOT use any solvents.
!<~~Ixc 111reverse order. cnsurtng that the hexagonai Replace erlsuring that the coarse filter fitted in the
,pru$ rctammg nut 1s screwed fully down and the water inlet and the fine t’iltcr in the gas inlet.
whole assembiy is screwed fully down Into the gas
12) PIEZO CARTRIDGE
To replace. turn off the cold water supply and gas. Pull off the electrode from the piezo cartridge.
Drain the heater by removing the water governer plug Remove the screw holding the gas control cam and
situated in the base of the water section. remove the cam CP- fig. 15).
tinscrew the four water unions (M - fig. 13) on the
ivater sectlon. Remove the two screws (Q - fig. 15) holding the
tinscrew the SK screws (N - fig. 13) holding the water
12ctlon to the gas section. Remove the piezo cartridge and replace if necessary.
[bemove rhe water section complete with the diaphragm.
Replace III reverse order - NOTE - fit the water gover- 13) HEAT INPUT
nor iast. It is easier if the cold water miet connection is
partially engaged before fitting the screws and re- The heat input is pre-set and non-adjustable. The
connectmg the union nuts. heat input and burner pressure should be checked
’ against Table 1.
If the heat input/burner pressure is, not correct, check
the working pressure at the pressure test point on the
10) WATER GOVERNOR gas service tap. This should be 20 mbar (8 ins w.g.).
To clean. turn off the cold water supply to the heater. The gas installation should be examined for any
Remove the governor situated in the base of the water possible blockage if the pressure is incorrect.
section (0 - fig. 14).
Clean the components with water.
Check that the spring loaded piston moves freely.
Replace in reverse order.
14) WATER SECTION VENTURI
Drain the heater as in Section 3.
11) GAS AND WATER FILTERS
Gas and water inlet filters are fitted between the inlet Disconnect the right hand heating body leg at the
taps and the heater. water section and remove the venturi.
To clean. turn off the taps, unscrew the union nuts Clean or replace as necessary and re-assemble in reverse
attaching the taps to the heater. and remove the filters. order.
PROBLEM CAUSE REMEDY
WATER TE>lPERATURE i ) Water rate too high (LP model) Check water regulator
i i ) Insufficient gas ilow Check rate and user’s tap is open
i i i ) Water governor sticking (Mains model: Remove and clean or replace
i v ) Incorrect venturi Replace (Mains model 3.65 mm
v ) No venturi fitted Fit
BURNER STAYS ON i ) Air in pipework Check for “dead-legs”
i i ) Gas valve stays open Clean and grease gas spindle
i i i ) Venturi blocked Remove and clean
i v ) Dirt on gas valve facing Strip and clean gas valve
v ) Loose jumper on house stop cock tap Replace water stop tap or pin down
v i ) Dirt or foreign matter in water section Clean water section
YELLOW FLAMES i ) Heating body fins blocked Remove heating body and clean
SOOT FORMED i i ) Primary air suppiy restricted Check burner manifold and clean
i i i ) Wrong injectors Check injector sizes
UNSTABLE FLAMES i ) Water in gas line h3e
i i ) Faulty flue Check terminal position and flue ducts
HEATING BODY i) Scale Descale heating body
NOISE i i ) Excessive gas Check gas pressure (see Page 3)
i i i ) Insufficient water flow see below
[NSUFFICIENT i ) Water service tap partly closed Check it is fully opened
WATER FL0 W i i ) Blocked venturi Remove and clean venturi
iii) Low water pressure Check water pressure
i v ) Water governor faulty Change governor
v ) Water governor sticking Remove and clean or replace
v i ) Foreign matter in water section Remove and clean
v i i ) Water reguiator (LP model) Adjust
PROB LETvl CAUSE REMEDY
PILOT FLAME DOES NOT i ) Gas service tap closed Open service tap
LImn ii) Airinpipe Purge iine
i i i ) Pilot injector blocked Clean or change
i v ) No ignition spark Check electrode. lead and igniter
POOR PILOT FLAME i ) Pilot injector dirty/damaged Clean or change
i i ) Wrong injector Change for correct diameter (0.23 mm)
i i i ) Pilot head blocked Clean
i v ) Faulty piiot tube Clean or replace
PILOT WILL NOT i ) Thermocouple not working Change thermocouple
STAY ALIGHT i i ) Thermoeiectric vaive faulty Change valve
i i i ) Gas pressure low/variable Check at inlet to heater (see Page 3)
i v ) Terminai wrongiy positioned Reposition heater (see Page 3)
v ) Badly assembled flue Refit - check sealing
v i ) Gaspressure too high Check with British Gas
MAIN BURNER DOES NOT i ) Gas service tap not open fully Open fully
LIGHT i i ) Gas pressure low Check at manifold and at inlet with
heater running (see Page3)
i i i ) Water rate iow Check if water rate is sufficient (Page 3)
i v ) Gas valve not opening Check(v) and (vi)
v ) Diaphragmpunctured Change diaphragm
v i ) Venturi blocked or loose Check venturi
v i i ) Gas control tap faulty Check operation of User’s gas control tar
v i i i ) Wrong injector Check for correct diameter (1.13 mm)
SCPLOSrVE IGNITION i ) Pilot Check pilot tube and injector
SAS CONTROL TAP i ) Grease dried Clean and regrease
ITIFF (USERS) i i ) Operating mechanism replaced Refit
Concord House - Brighton Road
Salfords - Redhiii
SURREY RHl 5 DX
HORLEY (02934) 72744