chaffoteaux ltd.

CORVEC BRITONY II A
CONFORMS WITH BRITISH AND EUROPEAN STANDARD STANDARD BS 5386PARTl EN.26
installation servicing instructions

contents

Page 3 : TECHNICAL DATA Pages4,5 and 6 : INSTALLATION Pages i,8 and 9 : SERVICING INSTRUCTIONS Pages 10 and 11 : FAULT FINDING Page 12 : SHORT LIST
CHART FOR CORVEC BRITONY.II

GENERAL

The CORVEC Britony II is a balanced flue instantaneous gas fired multipoint water heater. Two models are available, a normal pressure version for direct connection to the mains cold water supply and a low pressure version for connection to a cold 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

Air from room Air from outside 102 cm2 (15.8 in2) 51 cm2 ( 7.9 in2)

Low Level

102 cm2 (15.8 in2) 51 cm2 ( 7.9 in2)
The installation of the heater must be in accordance with the relevant requirements of the Gas Safety Regulations, Building Regulations and the Byelaws of the local Water Undertaking. It should also be in accordance with any relevant requirements of the local gas region and local 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 CP 332 Selection and installation of town gas hot water supplies. Part 1 - Domestic premises BS 5440 Flues and air supply for gas appliances of rated input not exceeding 60 kW (1st and 2nd family gases) Part 1 - Flues Part 2 - Air Supply

technical data

NATURALGAS

HIGH PRESSURE MODEL

TABLE 1

Low PRESSURE MODEL

Heat input Nominal Heat output Nominal Gas rate (maximum)
30,27 kW - 103,,280 Btu./h 22,70 kW - 77,450 Btu/h 2,m3/h - 99,24 ft3/h 15 mbar - 6,0 ins 6,51 l/m. 1,44 g.p.m. 11 ,l l/m - 2,44 g.p.m. lOm-33 ft.
29,21 kW - 99,600 Btu/h 21,90 kW - 74,700 Btu/h 2,78 m3/h - 98,18 ft3/h 135 mbar - 5,3 ins 6,3 l/m - 1,38 g.p.m. 10,5 l/m. 2,31 g.p.m. 1,5 m - 4,9 ft. 25 m - 82 ft. 22 mm copper 22 mm copper 15 mm copper
Burner pressure.. Main burner injectors marking. Pilot injector marking. Water flow rate - raised 500 C (900 F).. Water flow rate - raised 300 C (540 F).. Minimum operating head. Maximum operating head. Water inlet. right hand connection Water outlet. left hand connection..
100 m - 330 ft. 15 mm copper 15 mm copper 15 mm copper

Gas. centre connection..

Note : The minimum water pressure is for the correct operation of the heater only. An additional allowance must be made for the resistance of the pipework and fittings particularly where showers and washing machines are used. This should be the equivalent of 2 m (6.5 ft.) head.
Height.. Width.. Depth.. Weight.. Spaceforfixing-Top Spaceforfting-Sides.. Space for fixing. Bottom. Space for fixing - Front..
655 mm 395 mm 253 mm 19kg 65 mm 178 mm NIL 152mm
15.5 in 42 lb 2.6 ins 7.0 ins NIL 6.0 ins
HOLE FOR WALL LINER Width.. Height.. 305 mm 205 mm 12 ins 8 ius
WALL THICKNESS Standard flue set. Optional flue set.. 75-355 mm 75-610 mm 3-14 ins 3-24 ins

N.B. The low pressure model does not have a temperature selector knob

installation

The CORVEC Britony II is supplied in two cartons, one containing the heater, the other containing the balanced flue set. A minimum clearance of 80 mm (3.2 in) should be left above the top edge of the wall opening. For dimensions and clearance seePage 2 and Technical Data, Page 3. Slide the wall liner through the wall ensuring that it is horizontal and that the flanged end is flush with the face of the inside wall. Trim to length if necessary, so that the outer end of the duct is flush with the face of the outside wall. Make good around the wall liner if necessary (fig. 1). N.B. For walls of between 75-100 mm (3-4 in), turn the wall liner hooks down through 900.

INSTALLING

THE BALANCED
The standard flue set is suitable for walls having a thickness of 75 mm (3 in) to 355 mm (14 in). An optional flue set for wall thicknesses up to 610 mm (24 in) is available to special order. Detailed recommendations for flueing are given in BS 5440 : 1. The following notes are for general guidance only. The heater must be installed so that the flue terminal is exposed to the external air. The heater must not be installed so that the terminal discharges into another room or space such as an outhouse or lean-to. Termination should be on a clear expanse of wall, the terminal preferably being not less than 300mm (1 ft) away from a corner, recess or projection. DO NOT install the terminal : a) within 300 mm (1 ft) measured vertically from the bottom of an openable window, air vent or any other ventilation opening. b) within 300 mm (1 ft) above adjacent ground level. c) within 600 mm (2 ft) of any surface facing the terminal. d) immediately beneath eavesor 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 wall in which the terminal is situated, the terminal must be protected by a guard of durable material. (A terminal guard is available from Chaffoteaux Limited). The air inlet, product outlets duct or terminal of the heater must not be closer than 50 mm (2 in) to any combustible material. Detailed recommendations on the protection of combustible material are given in BS 5440 : 1.

PREPARING THE WALL

FITTING

THE FLUE TERMINAL

The flue terminal may be fitfed from inside or outside of the building by futing the two spring loaded chains over the hooks on the inside of the wall liner (fig. 2). Where the terminal is to be installed from inside the building, it can be passedthrough the wall liner and pulled back into position by using the chains. Where this procedure is used it must be ensured that there is no risk that the terminal can fall. It is recommended that a length of cord or string is fured to the terminal to prevent any risk of damage to the terminal, the building, or to danger to persons in or about the building.

THE HEATER

The heater is attached to the wall by 2 studs at the top and two screws at the bottom. A further optional top fxing is provided for installations where the wall adjacent to the top fming holes is of less than sound construction. The f=ing studs, screws and optional top bracket are packed with the gas service tap and a foam gasket and placed in a box which is found inside the heater. Remove the front case of the heater by pulling off the gas control/temperature control knobs and unscrewing the three fxing screws at the top, bottom and between the control knobs. Pull off the front case taking care not to loose the rubber spacer behind the centre ftig screw.
The heater should be installed on a wall of flat non-combustible material that will not reverberate. Whatever the thickness of the wall, make a hole 305 mm (12 in) wide by 205 mm (8 in) high. If the hole is cut accurately there isno need to line it as the wall liner will seal off the cavity.

Fig. 1

Fig. 2 4

Fig. 3

Remove the flue bend from the top of the heat exchanger by releasing the fixing clip and removing the two screws.
N.B. If the optional top fixing bracket is to be used this Distance from Meter outlet to heater Gas Supply
should now be attached to the top of the rear case with the screws already fitted to the case (fig. 3). Using the heater as a template, locate the spigot of the appliance in the wall liner, check that the appliance is vertical and mark the four or five fixing holes. Drill and plug the wall and fasten the top studs in position. These studs can be screwed into the wall by locking two nuts together on the parallel thread and using a spanner.
O-3 m ( O-10 ft) 3-20 m (1 O-65 ft) 20 m and above
15 mm 22 mm contact British Gas
These sizes are for the heater only and do not take account of any other gas appliances that may be connected to the same gas service pipework.

WATER CONNECTIONS

Attach the self adhesive foam gasket to the flat surface of the heater around the air inlet spigot of the rear case. Remove the protective paper while sticking down the gasket. Lift the heater into position on the wall, locating on the studs and the wall liner. Secure the heater to the wall using the nuts and screws provided. The hooks fit under the nuts of the top futing studs (fig. 4). Transfer the terminal furing chains from the wall linet to these hoods. The terminal chains should not be left fixed to the wall liner hooks. Slide the flue duct through the rectangular hole in the rear case and engage into the central spigot of the terminal so that it touches the two end stops. Refit the flue bend so that the flue duct engagesby 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 exchanger with the gasket in place. Replace the two screws and clip securing the flue bend. Do not refit the front cover until the appliance has been commissioned.

Remove the plastic covers protecting the water inlet and outlet connections. Fit the water service tap provided to the right hand connection at the bottom of heater using the coarse filter washer to seal the connection. Fit the 15 m dia. copper tails and washers provided to the inlet of the water service tap and to the outlet of the heater (left hand connection). The water service tap supplied with the heater incorporates a drain plug.

APPLICATIONS

OF THE CORVEC BRITONY
The heater is designed to serve a variety of hot water drawoff points including washing machines and showers. The heater can be connected to all the hot water drawoff points in the installation. If more than one outlet is open simultaneously the total flow of water cannot exceed that quoted in the TechnicaI data. The heater is compatible with most current automatic washing machines, but care should be taken to ensure that the machine is capable of accepting water at the design flow rate of the heater. Hot and cold fill machines normally require a hot water temperature of 600 C (1400 F), the heater producing approximately 6.5 l/m (1.44 gpm) at this temperature.he advice of the washing machine manufacturers should be sought, but generally it is only necessary to remove the water flow restrictor (if fitted) in the hot water inlet connection of the machine to obtain a satisfactory heater operation.

GAS CONNECTION

Remove the plastic cover from the gas inlet which is the centre connection on the bottom of the heater. Fit the gas service tap provided using the fine filter washer to seal the connection. Fit the 15 mm dia. copper tail nut and washer provided to the inlet of the gas service tap and connect this to the gas supply. The size of the gas supply pipe from the meter to the heater only should be as follows.
DEREVE WAT GOVERNOR Type 7052l4

ALTERNATIVE POSITION

Fig. 4 5
Contact Chaffoteaux Limited for details of those machines to be compatible with the CORVEC Britony II. The heater can be used to supply hot water to a separate shower draw-off. The heater should not be used to supply more than one shower mixing valve, but can supply two shower heads off a single mixing valve. The recommended pipework arrangement for a single shower head is shown in fig. 5. ,Only those fittings detailed should be used with the heater. Chaffoteaux Limited to not supply the water governor or any shower fittings. For local supplies of these please contact :
Turn the gas control knob fully anti-clockwise to the main gas position. If the pilot is now extinguished for any reason, return the gas control knob to the off position and wait approximately 30 seconds for the safety interlock to reset itself. Turn on an adjacent water draw-off point, the heater will now light.

Water Governor

Dereve (Flow Controls) Ltd unit 1 Dudley Road West Tividale Sandwell West Midlands 0215201337
Shower Accessories Walker Crossweller & Co. Ltd Whaddon Works, Cheltenham Gloucestershire, GL EP Tel : Topliss Showers Ltd 14 Wales Street Rothwell, Hants NN142JL Tel : Do not use the heater with push-on hand showers that fit over existing hot and cold water taps.

PIPEWORK

Check the burner pressure by fitting a suitable gauge to the pressure test point on the end of the burner manifold. The correct pressure is given in Table 1, Page 3. If the burner pressure is not correct, check that the pressure at the gas tap test point is 20 mbar (8 ins w.g.) with the appliance operating. If the inlet pressure is not correct, check for any possible blockage or restriction in the pipework to the heater. If the pressure cannot be corrected contact your local gas region. The heat input to the heater is preset 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 temperature rise of 500 C (900 F). Screw in to increase the temperature and out ot decreaseit.
Remove the gas control knob. Replace the front cover ensuring that the rubber spacer is in place behind the centre ftig screw. Refit all furing screws. Replace the gas control knob and temperature control knob ensuring that the knob indicates hot when turned fully clockwise. Hand the Users Instructions to the consumer and instruct in the correct and safe operation of the heater.
The following notes are for general guidance only. (i) the heaters performance may be affected if the installation has old pipework forming dead-legs or air reservoirs. Always ensure that any old pipework is either removed or capped off immediately adjacent to the pipework that will be in use. the size of pipework between the heater and the various draw-off points should be sized to ensure an adequate flow at all draw-offs when used individually.

DRAINING

If the heater is not to be used for long periods it is recommended that it be drained. See the Servicing Instructions for how to drain 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 external pipework connections. Fit the gas control knob and light the pilot by turningthe knob 900 anti-clockwise.It may be necessary to purge the pilot gas supply, if so, wait a few moments, return the gas control knob to the off position and repeat. (The pilot supply wilI only purge when the gas control knob has been turned 900 anti-clockwise).

Fig. 6

servicing instructions
Before commencing any servicing work, turn off the gas and water at the gas and water inlet taps on the appliance. Replace in reverse order making sure that the gasket between the burner manifold and gas section is in place and that the burner head assembly is correctly located on the two spigots at the rear.
RECOMMENDED SERVICING SCHEDULE For efficient and trouble-free operation, it is recommended that the heater is serviced annually. The following work should be carried out by a competent person. 9 ii) iii) iv) 4 vi) Clean the burner Clean the heating body (In hard water areas it may be necessary to descale the heating body) Clean the pilot and thermocouple Clean the gas and water filters Clean the water governor Change the diaphragm every three years Turn off the water inlet tap to the appliance as before and open an adjacent hot water draw-off point. Remove the drain plug from the side of the water inlet tap (C - fig. 8) and drain the water from the heater. Alternatively remove the water governor plug (D - fig. 8) from the base of the water section and dram the water from the heater. Replace the drain down valve and/or water governor plug before proceeding. Remove the burner (see section 2) Remove the screw holding the bottom of the heating body skirt to the rear case. Release the two union.nuts on the heating body legs. Remove the heating body. In hard water areas it may be necessary to descale the heating body. Use a solution consisting of 5 parts water to 1 part hydrochloric acid. The water should preferably be hot - ADD ACID TO WATER, NOT WATER TO ACID. To remove the heating body for further cleaning, the heater must fast be drained. 3) HEATING BODY Remove the flue bend from the top of the heat exchanger by removing the clip and the two furing screws. Lift the flue bend off the heat exchanger taking care not to damage the sealing gasket. The heating. body can be examined in position, and if external cleaning is sufficient, remove the burner and clean the heat exchanger with a soft brush, detergent and hot water.
1) FRONT CASING To remove, pull off the gas control and temperature control knobs. Unscrew the centre futing screw between the control knobs and the top and bottom fixing screws. Pull off the case taking care not to loose the rubber spacer behind the centre fixing point. 2) BURNER Unscrew the pilot tube clamping screw (A - fig. 7) and remove the clamp and tube. Remove the burner manifold by unscrewing the two screws (B -fig. 7). Pull burner head assembly forward to remove, taking care not to trap the thermocouple or ignitor wires. The burner head should be turned upside down and cleaned by brushing.

Fig. 7

Fig. 8

Fig. 9

Fill the heating body with this solution and leave until the solution stops bubbling. Flush out the heating body thoroughly before refitting to the heater.

WARNING - ACID/WATER SOLUTIONS MUST BE USED WITH EXTREME CAUTION. TAKE CARE NOT TO SPLASH THE SOLUTION ONTO SKIN OR INTO THE EYES. WASH ANY AREAS AFFECTED WITH LARGE AMOUNTS OF COLD WATER AND SEEK MEDICAL ADVICE.
6) SPARK ELECTRODE Remove the burner, see Section 2. Remove the electrode fixing screw (J - fig. 11) with a screwdriver placed inside the heating body skirt. Pull off the electrode cable from the piezo cartridge. Lift the electrode out of the gas section. Reassemble in reverse order, and note that the slot in the connector on the end of the electrode cable is vertical when pushed onto the cartridge.
Re-assemble in reverse order ensuring that the skirt fixing screw and reinforcing strip are in place.

4) PILOT

Unscrew the pilot tube clamping screw (A - fig. 7) and remove the clamp and tube. Blow through the tube to remove any dust. Remove the burner (see section 2). Unscrew the knurled pilot burner outer ring (E - fig. 9). Unscrew the pilot body (F - fig. 9) with a 15 mm spanner. Clean by blowing or washing in water. Do not clean the holes with a wire. Blow any dust out of the gas section. Re-assemble in reverse order.

7) THERMO-ELECTRIC

To replace, remove the thermocouple nut (G - fig. 10). Unscrew cap from the side of the gas section and withdraw the thermo-electric valve.
NOTE : This heater is fitted with a safety interlock. When the pilot is turned off, the heater can not be relit until the thermocouple cools down and the lighting sequence is repeated.

8) MAIN GAS VALVE

To inspect and clean, remove the burner (see Section 2).

5) THERMOCOUPLE

Disconnect the thermocouple Section 5 and 6).

and ignitor lead (see

Remove the burner, see Section 2. Remove the pilot, see Section 4. Unscrew the thermocouple nut (G - fig. 10) from the thermo-electric valve and remove it from the wire. With a 7 mm box spanner, unscrew the nut (H - fig. 11) holding the thermocouple into the gas section. Thread the thermocouple and wire up through the gas section. Replace in reverse order.
Remove the four screws fastening the top of the gas section to the base (K - fig. 12) and the two screws at the back (L - fig. 12) holding it to the rear case. Lift the gas section top off the base. Remove the complete gas valve assembly by unscrewing the brass cylinder that has two flats. Dismantle the gas valve assembly by unscrewing the hexagonal spring retainer from the top of the assembly. Remove the spring and gas valve and clean the valve seating.

Fig. 10

Fig. 11 8

Fig. 12

Replace the gas valve facing rubber and gas valve assembly 0 ring if necessary. Replace in reverse order, ensuring that the hexagonal spring retaining nut is screwed fully down and the whole assembly is screwed fully down into the gas section. Clean the filters by blowing or washing in water. DO NOT use any solvents. Replace ensuring that the coarse filter is fitted in the water inlet and the fme filter in the gas inlet.

12) PIEZO CARTRIDGE

Pull off the electrode from the piezo cartridge.

9) DIAPHRAGM

To replace, turn off the cold water supply and gas. Drain the heater by removing the water governer plug situated in the base of the water section. Unscrew the four water unions (M - fig. 13) on the water section. Unscrew the six screws (N - fig. 13) holding the water section to the gas section. Remove the water section complete with the diaphragm. Replace in reverse order - NOTE - fit the water governor last. It is easier if the cold water inlet connection is partially engaged before fitting the screws and reconnecting the union nuts.
Remove the screw holding the gas control cam and remove the cam (I - fig. 15). Remove the two screws (Q - fig. 15) holding the retaining plate. Remove the piezo cartridge and replace if necessary.

13) HEAT INPUT

The heat input is pre-set and non-adjustable. The 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 gas service tap. This should be 20 mbar (8 ins w-g.). The gas installation should be examined for any possible blockage if the pressure is incorrect.

10) WATER GOVERNOR

To clean, turn off the cold water supply to the heater. Remove the governor situated in the base of the water section (0 - fig. 14). Clean the components with water. Check that the spring loaded piston moves freely. Replace in reverse order.
11) GAS AND WATER FILTERS
14) WATER SECTION VENTURI
Drain the heater as in Section 3. Gas and water inlet fnters are fitted between the inlet taps and the heater. To clean. turn off the tans,, unscrew the union nuts * attaching the taps to the heater, and remove the filters. Disconnect the right hand heating body leg at the water section and remove the venturi. Clean or replace as necessary and re-assemble in reverse order.

Fig. 13

Fig. 14

Fig. 15

FINDING
CHART FOR CORVEC BRITONY II

PROBLEM

REMEDY

WATER TEMPERATURE

i ) Water rate too high (LP model) i i ) Insufficient gas flow
Check water regulator Check rate and users 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 LP model) v ) No venturi fitted Fit

BURNER STAYS ON

i ) Air in pipework i i ) Gas valve stays open i i i ) Venturi blocked i v ) Dirt on gas valve facing v ) Loose jumper on house stop cock tap
Check for dead-legs Clean and greasegas spindle Remove and clean Strip and clean gas valve Replace water stop tap or pin down jumper
v i ) Dirt or foreign matter in water section

Clean water section

YELLOW FLAMES
i ) Heating body fms blocked i i ) Primary air supply restricted i i i ) Wrong injectors
Remove heating body and clean Check burner manifold and clean Check injector sizes

SOOT FORMED

UNSTABLE

FLAMES

i ) Water in gas line i i ) Faulty flue
Purge Check terminal position and flue ducts

HEATING

i ) Scale i i ) Excessive gas i i i ) Insufficient water flow
Descale heating body Check gas pressure (see Page 3) seebelow

[NSUFFICIENT WATER FLOW

i ) Water service tap partly closed i i ) Blocked venturi i i i ) low water pressure i v ) Water governor faulty v ) Water governor sticking v i ) Foreign matter in water section v i i ) Water regulator (LP model)
Check it is fully opened Remove and clean venturi Check water pressure Change governor Remove and clean or replace Remove and clean Adjust
CHART FOR -CORVEC BRITONY II
PILOT FLAME DOES NOT LIGHT
i ) Gas service tap closed i i ) Air in pipe i i i ) Pilot injector blocked i v ) No ignition spark
Open service tap Purge line Clean or change Check electrode, lead and ignitor

POOR PILOT FLAME

i ) Pilot injector dirty/damaged i i ) Wrong injector ii i ) Pilot head blocked i v ) Faulty pilot tube
Clean or change Change for correct diameter (0.23 mm) Clean Clean or replace
PILOT WILL NOT STAY ALIGm
i ) Thermocouple not working i i ) Thermoelectric valve faulty i i i ) Gas pressure low/variable i v ) Terminal wrongly positioned v ) Badly assembled flue v i ) Gas pressure too high
Change thermocouple Change valve Check at inlet to heater (see Page 3) Re-position heater (see Page 3) Refit - check sealing Check with British Gas
MAIN BURNER DOES NOT LIGHT
i ) Gas service tap not open fully i i ) Gas pressure low
Open fully Check at manifold and at inlet with heater running (see Page 3)
i i i ) Water rate low i v ) Gas valve not opening v ) Diaphragm punctured v i ) Venturi blocked or loose v i i ) Gas control tap faulty v i i i ) Wrong injector
Check if water rate is sufficient (Page 3) Check (v) and (vi) Change diaphragm Check venturi Check operation of Users gas control tap Check for correct diameter (1.13 mm)

EXPLOSIVE IGNITION

i ) Pilot
Check pilot tube and injector
GAS CONTROL TAP STIFF (USERS)
i ) Grease dried i i ) Operating mechanism replaced incorrectly

Clean and regrease Refit

Shortlist

48 48a 69 68

Key No

DESCRIPTION

NU%ER 366032 263451
MAKERS PART NUMBER 43793 19868/41198/08 24164/41948/25809120

95 145

Gas Control Knob.'.. Temperature Selector Knob.. Gas Service Tap Assembly. Washer for Copper Tails.. GasFilter.. Water Filter. Water Service Tap with Drain Plug. Drain Plug.. 0 Ring Seal... Seal(RearCasetoWallLiner). WallFixingStud.. NutM7.. Washer.. Hook.. WallFixingScrew.. Copper Tails 22 mm and Nut Low pressure model only. CopperTails 15rnm.. Nuts for Copper Tail.. Thermocouple Assembly.. Electrode and Lead Assembly. Diaphragm.

387252 263432

CHAFFOTEAUX LIMITED Concord House Brighton Road Redhill - Surrey

Telephone, HORLEY 72744

chaffoteaux ltd.

c%%iiii~

CORVEC BRITONY II
CONFORMS WITH EUROPEAN STANDARD EN.26
installation servicing instructions
Page 3 Pages 4. 5 and 6 Pages i. B and 9 Pages 10 and 11 Page 12
: TECHNICAL : IXSTALLXTION : SERVICING : F.4ULT : SHORT
[SSTRUCTIONS CHART FOR CORVEC BRITONY II

FINDING LIST

GENERAL 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 Air from room Air from outside
102 cm2 (I 5.8 in2) 51 cm2 ( 7.9 in2)

Low Levei

102 cm2 (15.8 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 -y3 Selection and instahation of town gas hot water mppiies. Pati 1 - Domestic premises CP32 -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

technical data

NATURAL GAS.YAl-CRAL c;,\s

TABLE 1

Heat mput Nominal. Heat output Nominal Gas rate (maximum)... 30.27 kW m-.70 kW 3.81 mjih 15 mbar 6.5 I/m 11.l I/m 10m IOOm 3.5 m 8 m 1A4 g.pm. 2.44 g.pm. 15 p-s-i. 150 psi. 11Jft 26 103.280 Btu/h 77.450 Btu/h 99.24 ft3/h 6.0 ins
Burner pressure.. Main burner mjectors marking &. Pilot injector marking.. Water flow rate. raised 500 C (900 F). Water tlow rate. raised 300 C (540 F). Minimum operating head for normal pressure. Maximum operating head for normal pressure. Minimum operating head for iow pressure.. Maximum operating head for low pressure..
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 Water outlet

Right hand connection Left hand connection Centre connection 655 mm 395 mm 253 mm 19kg 65 mm 178mm NIL 152mm
15 mmcopper 15mmcopper 15 mmcopper 26 in 15.5 in 10 in 42lb 2.6 ins 7.oins NIL 6.0 ins
Gas.. Height.. Width.. Depth.. Weight.. Spaceforftig-Top Space for fling -Sides... Space for fixing. Bottom. Spaceforftig-Front
HOLE FOR WALL LINER Width.. Height.. 305 mm 205 mm 12ins 8ins
WALL THICKNESS Standardflueset. Optionaiflueset.. 75-355 mm 75-610 mm 3.14 ins 3-24 ins
NB. The low pressure model does not have a temperature selector knob

installation

rile CORVEC Uritony 11 is supplied in two cartons. one <ontamtr;c LilL heater. the other contammg the balanceu tlue ser. :\ minimum ciearance or SO mm t 3.2 in) should be left above the top edge ot the wall openmg. For dimenstons and 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 outer end of the duct IS tlush with the ta<e oi the outside wail. Make good around ihc wall liner 11necessary (fig. 1). N.B. For walis oi between 75-100 mm (3-J in). turn the wall liner hooks down through 900
INSTALLING THE B;\LANCED FLUE nle srclndard flue set IS sultabie for walls havmg a thickness 0i 75 mm (3 in) to 355 mm (14 in). Xn optional flue set <or wali thicknesses up to 610 mm (24 in) IS avatiable to spectai order. 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 installed so rhat the terminal discharges mto another room or space such as an outhouse or lean-to. rmmatlon should be on a clear expanse oi wail. the termtnai preferably being not less than 000 mm 1.I ft) away from a corner. recessor projection. DO NOT install the terminal : a) within 100 mm (1 ft) measured vertically from the bottom of sn openable wmdow. air vent or any other ventiiation opening. b) within 300 mm (1 ft) above adjacent ground level. 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 protected by a guard of durable materiai. (A terminal guard is avaiiable from Chaffoteaux Limited). The air iniet. product outlets duct or termmai oi the heater must not be closer than 50 mm (2 in) to any combustible tertal. Detailed recommendations on the protection of conbustible ,umbusribie material are given in BS 5440 : I. PREPARING THE WALL The heater should be installed on a wall of flat non-combustible material that w-ii1 not reverberate. Whatever the thickness of the wail. make a hole 305 mm ( I? in) wide by 205 mm ( 8 in) high. If the hole is cut accurately there is no need to iine it as the wail liner will seai off the cavity.

FII-I-ING THE FLUE TERMINAL The flue terminal may be fitted trom mslde or outside of the building by fixing the two sprmg loaded chains over the hooks on the instde of the wail liner (fig. 1. Where the termtnai is to be m&led from mstde the building. it can be passedthrough the wail liner and pulled back into posltton by usmg the chams. Where this procedure is used it must be ensured that there IS no risk that the terminai can fall. It is recommended that a length of cord or string is fiyed to the termmai to prevent any risk of damage to the terminai. the building. or to danger to persons tn or about the building.
INSTALLING THE HEATER The heater is attached to the waii by.?studs at the top and two screws at the bottom.A further optronai top fting is provided for instailations where the waU adjacent to the top fixing hoies is of less than sound construction. The fig studs. screws and optional cop bracket are packed witk the gas service tap and a foam gasket and placed in a box which is found inside the heater. Remove the front case of the heater by pulling off the gas control/temperature control knobs and unscrewing the three ftving screws at the :op. bottom and between the control knobs. Pull off the front case taking.care not to 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 hy reieasmg the tixing clip and removtng the two screws. N.B. It ihe oprionai top fucing bracket IS to be used this Aouid now be attached to the top of the rear case with the screws aiready ritted to the case(fig. 3). Using the heater as a template. locate the spigot oi the qpilance III the wail liner. check that the appliance is vrrtlcal 2nd mark the four or five fiiing holes. Drill and piug the wail and fasten the top studs in position. These studs can be screwed into the wall by locking two nuts together on the parallel thread and using a spanner. Distance trom Meter outlet to heater O-3 m t O-IO ftl 3-20 m ( IO-65 ft ) 20 m and above Gas Supply IS mm 2 mm contact British Gas
These sizes are for the heater oniy and do not take account of any other gas appiiances that may be connected to the same gas servtce pipework. WATER CONNECTIONS Remove the plastic covers protectmg the water inlet and outlet connections. Fit the water service tap provided to the right hand connection at the bottom of heater usmg the coarse Mter washer to seal the connectlon. Fit the 15 m dia. copper tails and washers provided to the inlet of the water service tap and to the outlet of the heater (left hand connection 1. The water service tap supplied with the heater incorporates a drain plug.

.-\itach the seit adhesive foam gasket to the flat surface oi the heater around the air inlet spigot of the rear case. Remove the protective paper whiie sticking down the gasket. 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 ;IIJCS the top iixing studs (fig. 4). or Trxnsrer the termmai fixing chains from the wail iinet to these hooas. The termmai chains should not be left fixed to the wail liner hooks. 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 exchanger with the gasket in place. Replace the two screws and clip securmg the !lue bend. Do not refit the front cover until the appliance has been iommissloned.
APPLICATIONS OF THE CORVEC BRITONY II The heater is designed to serve a variety of hot water drawoff points including washing machines and showers. The 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 the machine is capable of accepting water at the design flow rate of the heater. Hot and cold fii machines normally require a hot water temperature of 600 C (1400 F), the heater producing approximateiy 6.5 i/m (1.44 gpm) at this temperature. (he advice of the washing machine manufacturers should be sought, but generally it is only necessary to remove the water flow restrictor (if fitted) in the hot water inlet connection of the machine to obtain a satisfactory heater operation.

GAS CONNECTION

Remove the piastic cover from the gas inle; which is the ,<emove
centre connectlon on the bottom of the heater. Fit the gas service tap provided using the fine filter washer to seai the connection. Fit the 15 mm dia. copper tail nut and washer provided to the inlet of the gas service tap and connect this to the gas supply. The size of the gas supply pipe from the meter to the heater oniy should be as follows.

TO COLD TAPS

ALTERNATIVE POSITION
Contact Chaffoteaux Limited for detatis of those machines known IO be compatrble with the CORVEC Britony il The heater can be used to supply hot water to a separate shower draw-oii. The heater should not be used to suppiy more than one shower mixing valve. but can supply two shower heads oif a singie nuxing valve. The recommended pipework arrangement tbr a smgle shower head is shown in fig. 5. Only those.ittings detailed should be used with 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. Unit 1 1. Middlemore industrtal Estate. Middlemore Road. Smethwick, Warley, West Midlands Tel : Turn the gas control knob fully anticlockwise to the main gas posttion. if the piiot IS now extinguahed for any reason. return the gas control knob to the off position and watt approxnnateiy 30 seconds for the safety interlock to reset Itself. Turn on an adjacent water draw-oif pomt. the heater will now light.

520 1337

Shower Accessories Walker Crosweller & Co Limited, Whaddon Works. Cheltenham. Gloucestershire CL52 SEP Tel.042 27953. -
Check the burner pressure by fitting a suttable gauge to the pressure test point on the end of the burner manifold. The correct pressure is given in Table 1. Page 3. If the burner pressure is not correct. check that the pressure at the gas tap test point is 20 mbar (8 ins w.g.) with the appliance operating. If the inlet pressure is not correct. check for any possible blockage or restriction UI the pipework to the heater. If the pressure cannot be corrected contact your local gas region. The heat input to the heater is preset 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 temperature rise of 500 C (900 F). Screw in to increase the temperature and out ot decrease it.
Do not use the heater with push-on hand showers that fit over existing hot and cold water taps.
Remove the gas control knob. Replace the front cover ensuring that the rubber spacer is in place behind the centre fixing screw. Refit all fixing screws. Replace the gas control knob and temperature control knob ensuring that the knob indicates hot when turned fully clockwise. Hand the Users instructions to the consumer and instruct in the correct and safe operation of the heater.

PIPEWORK The following notes are for general guidance only. 6) the heaters performance may be affected if the installation has old pipework forming dead-legs or air reservoirs. Always ensure that any old pipework is either removed or capped off immediately adjacent to the pipework that will be in use. the size of pipework between the heater and the various draw-off points should be sized to ensure an adequate flow at all draw-offs when used individually.
DRAINING THE HEATER If the heater is not to be used for long periods it is recommended 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.troi supply wiil only purge when the gas controi knob has been jclppiy turned 900 anticlockwise). Fig. 6

servicing instructions

Before commencing any servicingwork. turn off the gas and water at the gasand water iniet taps on the appiiance. Rep&e in reverse order making surethat the gasket between 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 that the heater is servicedannuaiiy, The following work shouid be carriedout by a competentperson. 0 ii) ii)

iv).V)

3) HEATING BODY
Cleanthe burner Clean the heating body (In hard wafer areasir may be necessary descaie heating body) fo the Cleanthe pilot and thermocouple Cleanthe gasand water falters Cleanthe water governor Change diaphragmeverythree years the
Removethe flue bend from the top of the heatex&anger by ,removingthe clip gnd the fwo fixing screws. Lift the flue bend off the heat exchangertaking carenot to damage the sealing gasket. The heating body can be exa&ed in posirion, and if external cleaningis s&icient, remove the burner and clean the heat exchanger with a soft brush.detergentand hot water. To remove the heating body for further cieaning,the heatermust first be drained. Turn off the wafer iniet tap to the applianceas before and open an adjacenthot water draw-off point:Remove the drain plug from the side of the water inlet tap (C - fig. 8) and drain the water from the heater. Alternatively removethe wafer governorplug (D - fs. 8) from the baseof the wafer section and drain the water from the heater. Replace the drain down valve and/or water governor plug before proceeding. Removethe burner (seesection 2) Remove the screw holding the bottom of the heating body skirt to the rear case. Releasethe two union nuts joining the heating body legsto the wafer section. Removethe heatingbody. In hard water areasit may be necessary descaIe to the heating body. Use a solution consisting of 5 parts water to 1 part hydrochloric acid. The water should preferably be hot - ADD ACID TO WATER NOT WATER TO ACID.

1) FRONT CASING To remove, pull off the gas control and temperature control knobs. Unscrew the centre futing screw between the control knobsand the top and bottom fixing screws. PuII off the case taking care not to loose the rubber spacerbehindthe centreftig point.

2) BURNER

Unscrewthe pilot tube clampingscrew(A - fig. 7) and removethe clamp and tube. Remove the burner manifold by unscrewing the two screws - fig. 7). (B MI burner head assemblyforward to remove, taking care not to trap the thermocouple or igniter wires. The burner head should be turned upside down and cleanedby brushing.

Fig. 7

Fig. 8

Fig. 9

[ill the tmtmg body with this soiutm ami leave unrd ttlc soiutlon stops bubbling. Flush out the hcatmg body rilorouzidy bciorc rctitting to the heater. W,ARNINC - \CID/W.ATER SOLUTIONS \lUST BE USED WITH E!CI-REblE CAUTION. T,AKE CARE NOT TO SPLASH THE SOLUTION ONTO SKIN OR INTO THE EYES. WASH ANY AREAS AFFECTED WITH LARGE.4310UNTS OF COLD WATER AND SEEK MEDICAL ADVICE. Re-assembie m reverse order ensuring that the skirt tixing screw and reinforcing strip arc m pisce. 6) SPARK ELECTRODE
2 Remove the burner. XC &XLIUII.!.
Remove the ciectrodc tising screw (J - fig. 1 I) with a screwdriver placed inside the hcstmg body skirt. Pull oli the electrode cable trom the p~ezo cartridge. Lift the eiectrodc out 01.the gss sectIon. Reassemble in reverse order. and note that the slot in the connector on the end of the electrode cable is vertical when pushed onto the cartrIdge.
4) PILOT Unscrew the pliot tube ciamping screw (A - fig. 7). and remove the ciamp and tube. Blow through the tube to remove any dust. Remove the burner (see section 1). Unscrew the knurled pilot burner outer rmg (E - fig. 9). Unscrew the piiot body (F - fig. 9), with a 15 mm spanner. Clean by blowing or washing in water. Do not clean the holes with a wire. Blow any dust out of the gas section. Re-assemble in reverse order.
7) THERMO-ELECTRIC VALVE To repiace. remove the thermocouple nut (G - fig. IO) Unscrew cap from the side ot the gas section and withdraw the thermo-electric valve. NOTE : This heater is fitted with a safety interlock. When the pilot is turned off. the heater can not be relit until the thermocoupie cools down and the lighting sequence is repeated.

8) MAIN GAS VALVE To inspect and clean. remove the burner (see Section 2). 5) THERMOCOUPLE Remove the burner. see Section 2. Remove the pilot. see Section 4. Unscrew the thermocoupie nut (G - fig. 10) from the thermo-electric valve and remove it from the wire. With a 7 mm box spanner. unscrew the nut (H - fig. 11) holding the thermocouple into the gas section. Thread the thermocoupie and wire up through the gas section. Replace in reverse order. Disconnect the thermocoupie Section 5 and 6).

igniter

lead (see
Remove the four screws iastenmg the top of the gas section to the base (K - fig. 12) and the two screws at the back (L - fig. I?), holding it to the rear case : Lift the gas section top oif the base. Remove the complete gas valve assembly by unscrewing the brass cylinder that has two flats. Dismantle the gas valve assembly by unscrewing the hexagonal spring retainer from the top of the assembly. Remove the spring and gas valve and cleah the valve seating.
!ieplace c/11 valve lacing rubber and gas valve assemgas t>Iv ricccssarv. bly 0 ring 11 !<~~Ixc 111reverse order. cnsurtng that the hexagonai ,pru$ rctammg nut 1s screwed fully down and the whole assembiy is screwed fully down Into the gas xectlon.
(Jean tjlc tilters t)y blowmg

or washing in water. DO

NOT use any solvents. Replace erlsuring that the coarse filter fitted in the water inlet and the fine tiltcr in the gas inlet.
DIAPHRAGXI To replace. turn off the cold water supply and gas. Drain the heater by removing the water governer plug situated in the base of the water section. tinscrew the four water unions (M - fig. 13) on the ivater sectlon. tinscrew the SK screws (N - fig. 13) holding the water 12ctlon to the gas section. [bemove rhe water section complete with the diaphragm. Replace III reverse order - NOTE - fit the water governor iast. It is easier if the cold water miet connection is partially engaged before fitting the screws and reconnectmg the union nuts.
12) PIEZO CARTRIDGE Pull off the electrode from the piezo cartridge. Remove the screw holding the gas control cam and remove the cam CP- fig. 15). Remove the two screws (Q - fig. 15) holding the retaining piate. Remove the piezo cartridge and replace if necessary.
13) HEAT INPUT The heat input is pre-set and non-adjustable. The 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 gas service tap. This should be 20 mbar (8 ins w.g.). The gas installation should be examined for any possible blockage if the pressure is incorrect.

10) WATER GOVERNOR To clean. turn off the cold water supply to the heater. Remove the governor situated in the base of the water 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 11) GAS AND WATER FILTERS Gas and water inlet filters are fitted between the inlet taps and the heater. To clean. turn off the taps, unscrew the union nuts attaching the taps to the heater. and remove the filters. Drain the heater as in Section 3. Disconnect the right hand heating body leg at the water section and remove the venturi. Clean or replace as necessary and re-assemble in reverse order.

PROBLEM

REMEDY

WATER TE>lPERATURE

i ) Water rate too high (LP model) i i ) Insufficient gas ilow i i i ) Water governor sticking (Mains model: i v ) Incorrect venturi
Check water regulator Check rate and users tap is open Remove and clean or replace Replace (Mains model 3.65 mm LP model)

v ) No venturi fitted

BURNER STAYS ON
i ) Air in pipework i i ) Gas valve stays open i i i ) Venturi blocked i v ) Dirt on gas valve facing v ) Loose jumper on house stop cock tap
Check for dead-legs Clean and grease gas spindle Remove and clean Strip and clean gas valve Replace water stop tap or pin down jumper
v i ) Dirt or foreign matter in water section

Clean water section

YELLOW FLAMES
i ) Heating body fins blocked i i ) Primary air suppiy restricted i i i ) Wrong injectors
Remove heating body and clean Check burner manifold and clean Check injector sizes

SOOT FORMED

UNSTABLE FLAMES
i ) Water in gas line i i ) Faulty flue
Check terminal position and flue ducts

HEATING BODY

Descale heating body Check gas pressure (see Page 3)

see below

i i ) Excessive gas i i i ) Insufficient water flow

[NSUFFICIENT WATER FL0 W

i ) Water service tap partly closed i i ) Blocked venturi iii) Low water pressure
Check it is fully opened Remove and clean venturi Check water pressure Change governor Remove and clean or replace Remove and clean Adjust

i v ) Water governor faulty v ) Water governor sticking v i ) Foreign matter in water section v i i ) Water reguiator (LP model)

PROB LETvl

PILOT FLAME DOES NOT LImn
i ) Gas service tap closed ii) Airinpipe i i i ) Pilot injector blocked a i v ) No ignition spark
Open service tap Purge iine Clean or change Check electrode. lead and igniter

POOR PILOT FLAME

i ) Pilot injector dirty/damaged i i ) Wrong injector i i i ) Pilot head blocked i v ) Faulty piiot tube
Clean or change Change for correct diameter (0.23 mm) Clean Clean or replace
PILOT WILL NOT STAY ALIGHT
i ) Thermocouple not working i i ) Thermoeiectric vaive faulty i i i ) Gas pressure low/variable i v ) Terminai wrongiy positioned v ) Badly assembled flue v i ) Gaspressure too high
Change thermocouple Change valve Check at inlet to heater (see Page 3) Reposition heater (see Page 3) Refit - check sealing Check with British Gas
MAIN BURNER DOES NOT LIGHT
i ) Gas service tap not open fully i i ) Gas pressure low
Open fully Check at manifold and at inlet with heater running (see Page3)
i i i ) Water rate iow i v ) Gas valve not opening
Check if water rate is sufficient (Page 3) Check(v) and (vi) Change diaphragm Check venturi Check operation of Users gas control tar Check for correct diameter (1.13 mm)

v ) Diaphragm punctured

v i ) Venturi blocked or loose v i i ) Gas control tap faulty v i i i ) Wrong injector

SCPLOSrVE IGNITION

i ) Pilot
Check pilot tube and injector
SAS CONTROL TAP ITIFF (USERS)
i ) Grease dried i i ) Operating mechanism replaced iIlCOtTE%tly

Clean and regrease Refit

CHAFFOTEAUX Concord House SURREY RHl
LIMITED Brighton Road 5 DX
Salfords - Redhiii HORLEY (02934) 72744