Chaffoteaux & Maury CORVEC BRITONY II T User manual

==sv
u
chaffoteaux ltd.
CORVECBRITONY II.T
CONFORMS WITH BRITISH STANDARD BS 5386 PART I
AND EUROPEAN STANDARD EN.26
installation
servicingrequirements

contents
Page3 : TECHNICAL DATA
Pages4,5 and6 : INSTALLATION
Pages7,s and9 : SERVICING INSTRUCTIONS
Pages10 and 11 : FAULT FINDING CHART FOR CORVEC BRITONY II T
Page12 : SHORT LIST
GENERAL
The CORVEC Britony II T is a balanced flue instantaneous gasfired multipoint water heater. Two models are avai-
lable, a normal pressureversion for direct connection to the mains cold water supply and a low pressure version for
connection to a cold water storagetank.
The CORVEC Britony II T doesnot require any purpose provided ventilation unlessinstalled 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 theseopenings must be :
High Level Low Level
Air from room 102cm2(15.8 in*) 102cm* (15.8 in*)
Air from outside 51cm* (7.9 in*) 51cm* (7.9 in*)
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 rele-
vant requirements of the local gasregion and local authority and the relevant recommendations of the following Bri-
tish Standard Codesof Practice.
CP 331 Installation of pipes and meters for town gas
Part 3 - Low pressureinstallation pipes
CP 332 Selection and installation of town gashot water supplies. Part 1- Domestic premises
BS 5440 Flues and air supply for gasappliances of rated input not exceeding60 kW (1st and 2nd family gases)
Part 1- Flues
Part 2 - Air Supply
2

technicaldata
NATURAL GAS TABLE 1
HIGH PRESSURE LOW PRESSURE
MODEL MODEL
Heat input Nominal .......................... 30,27 kW - 103,280 Btu/h 29,21 kW - 99,600 Btu/h
Heat output Nominal ......................... 22,70 kW - 77,450 Btu/h 21,90 kW - 74,700 Btu/h
Gas rate (maximum) .......................... 2,81m3/h - 99,24 ft3/h 2,78 m3/h - 98,18 ft3/h
Burnerpressure .............................. 15mbar - 6,0 ins 13,5 mbar - 5,3 ins
Main burner injectors marking ................. 113 118
Pilot injector marking ......................... 23 23
Water flow rate - raised 50” C (90” F) ............ 6,51l/m - 1,44 g.p.m. 6,3 l/m - 1,38g.p.m.
Water flow rate - raised 30” C (54” F) ............ 11,l l/m - 2,44 g.p.m. 10,5 l/m - 2,31g.p.m.
Minimum operating head ...................... 10m - 33 ft. 1,5m - 4,9 ft.
Maximum operating head ..................... 100m - 330 ft. 25 m - 82 ft.
Water inlet - right hand connection ............. 15mm copper 22 mm copper
Water outlet - left hand connection .............. 15mm copper 22 mm copper
Gas - centre connection ....................... 15mm copper 15mm copper
Height ......................................
Width ......................................
Depth ......................................
Weight ......................................
Spacefor fixing - Top .........................
Spacefor fixing - Bottom ......................
Spacefor fixing - Sides ........................
Spacefor fixing - Front ........................
655 mm 26 in
395 mm 15,5 in
253 mm 10in
19kg 42 lb
65 mm 2.6 ins
178 mm 7.0 ins
NIL NIL
152 mm 6.0 ins
HOLE FOR WALL LINER
Width ......................................
Height ......................................
WALL THICKNESS
305 mm 12ins
205 mm 8 ins
Standard flue set. ............................. 75-355 mm 3-14 ins
Optional flue set. ............................. 75-610 mm 3-24 ins
N.B. : The low pressuremodel doesnot have a temperature selector knob.
HIGH PRESSURE MODEL :
The minimum water pressureis 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.
LOW PRESSURE MODEL :
The low pressure Britony II T Water Heater requires a minimum static head of 4.9 feet for the correct operation of
the appliance and adequateadditional allowance for pipework and fittings must be made.
FOR GUIDANCE ONLY :
A static head of 11.5 feetabove the highest draw-off tap is normally sufficient provided pipe runs are not excessivein
length and do not include an excessiveamount of fittings. It is advisable to utilise 22 mm tube throughout the instal-
lation making final connections only in 15 mm tube to l/2” draw-off taps. High resistance valves, taps and fittings
should be avoided. Where possible utilise machine made bends in tube rather than fittings. Gate valves only should
be usedfor appliance isolation.
N.B. : The low pressureBritony is not suitable for usewith showersand automatic washing machines.
3

installation
The CORVEC Britony II T is supplied in two cartons, one
containing the heater, the other containing the balanced flue
set.
INSTALLING THE BALANCED FLUE
The standard flue setis 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 ex-
posedto the external air. The heater must not be installed so
that the terminal dischargesinto another room or spacesuch
asan outhouse or lean-to.
Termination should be on a clear expanseof wall, the termi-
nal preferably being not lessthan 300 mm (1 ft) away from a
corner, recessor projection.
DO NOT install the terminal :
a) within 300 mm (1 ft) measured vertically from the bot-
tom of an openable window, air vent or any other venti-
lation 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 lessthan 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 protec-
ted by a guard of durable material. (A terminal guard is avai-
lable from Chaffoteaux Limited).
inside wall. Trim to length if necessary,sothat 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 90”.
FITTING THE FLUE TERMINAL
The flue terminal may be fitted from inside or outside of the
building by fixing 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 buil-
ding, it can be passedthrough the wall liner and pulled back
into position by using the chains. Where this procedure is
usedit must be ensuredthat there is no risk that the terminal
can fall. It is recommended that a length of cord or string is
fixed to the terminal to prevent any risk of damage to the
terminal, the building, or to danger to persons in or about
the building.
INSTALLING 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 fixing is
provided for installations where the wall adjacent to the top
fixing holes is of less than sound construction. The fixing
studs, screws and optional top bracket are packed with the
gasservice tap and a foam gasketand placed in a box which
is found inside the carton.
Remove the front case of heater by pulling of gas control-
/temperature control knobs, slide facia plate upwards to ex-
pose case fixing screw, and unscrewing the three fixing
screws at the top, bottom and between the control knobs.
Pull off the front casetaking care not to lose the rubber spa-
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 BS5440 : 1.
PREPARING THE WALL
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 is no
needto line it asthe wall liner will sealoff the cavity.
A minimum clearance of 80 mm (3.2 in) should be left abo-
ve the top edge of the wall opening. For dimensions and
clearance seepage2 and Technical Data, page3.
Slide the wall liner through the wall ensuring that it is hori-
zontal and that the flanged end is flush with the face of the
Fig. I Fig. 2
4
Fig. 3

installation
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
should now be attached to the top of the rear casewith the
screwsalready fitted to the case(fig. 3).
Using the heater as a template, locate the spigot of the ap-
pliance 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
screwedinto the wall by locking two nuts together on the pa-
rallel thread and using a spanner.
Attach the self adhesive foam gasketto 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 screwsprovided. The hooks fit under the nuts of the top
fixing studs(fig. 4).
Transfer the terminal fixing chains from the wall linq 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 engageinto the central spigot of the terminal so
that it touches the two end stops. Relit the flue bend sothat
the flue duct engagesby at least 25 mm (1 in), it may be ne-
cessaryto cut the flue duct to the correct length, and ensure
that the flue bend is seatedcorrectly on the heat exchanger
with the gasketin place. Replace the two screwsand clip se-
curing the flue bend.
Do not relit the front cover until the appliance has been
commissioned.
GAS CONNECTION
Remove the plastic cover from the gasinlet which is the cen-
tre connection on the bottom of the heater.
Fit the gasservice 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 gassupply.
The size of the gassupply pipe from the meter to the heater
only should be asfollows.
Distance from Meter
outlet to heater
O-3 m (O-10It)
3-20 m (lo-65 ft)
20 m and above
Gas Supply
15mm
22 mm
contact British Gas
These sizesare for the heater only and do not take account
of any other gas appliances that may be connected to the
samegasservice pipework.
WATER CONNECTIONS
Remove the plastic covers protecting the water inlet and ou-
tlet connections.
Fit the water service tap provided to the right hand connec-
tion at the bottom of heater using the coarsefilter washer to
sealthe 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 II T
The heater is designed to serve a variety of hot water draw-
off points including washing machines and showers. The
heater can be connected to all the hot water draw-off points
in the installation. If more than one.outlet is open simulta-
neously the total flow of water cannot exceedthat quoted in
the Technical data.
The heater is compatible with most current automatic was-
hing 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 60” C (140” F), the heater produ-
cing approximately 6.5 l/m (1.44 g.p.m.) at this temperatu-
re. The advice of the washing machine manufacturers
should be sought, but generally it is only necessaryto remo-
ve the water flow restrictor (if fitted) in the hot water inlet
connection of the machine to obtain a satisfactory heater
operation.
ALTERNATIVE
,,,,,,,,, ,,,,,,,, *, ,,,, * ,,,,,,,,,,,m de/j ,,,,,,,, A,,, ,,,,,,, :,
POSITION
5

installation
Contact Chaffoteaux Limited for details of those machines Turn on an adjacent water draw-off point, the heater will
known to be compatible with the CORVEC Britony II T. now light.
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 no supply the water governor
or any shower fittings. For local supplies of these please
contact :
Water governor :
Check the burner pressure by fitting a suitable gaugeto 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 gastap
test point is 20 mbar (8 ins w.g.) with the appliance opera-
ting. If the inlet pressure is not correct, check for any possi-
ble blockage or restriction in the pipework to the heater. If
the pressure cannot be corrected contact your local gas re-
gion. The heat input to the heater is preset and non-
adjustable.
Dereve (Flow Controls) Limited
Park lane
HANDSWORTH
Birmingham B21 8LE021 5537 021
For the low pressure model, adjustment of the water flow
rate is necessary.With the burner pressure checked asbefo-
re, adjust the water throttle (fig. 6) to give a temperature rise
of 50” C (90” F). Screwin to increase the temperatur and out
of decreaseit.
Shower Accessories :
Walker Crossweller and Co. Ltd. Remove the gascontrol knob
Whaddon Works, Cheltenham
Glocs. GL52 5EP
Tel : [phone]
Aqualisa Products Limited
Horton’s Way, London Road,
WESTERHAM, Kent, TN16 1BT
Tel : Westerham (0959) 63240
Do not use the heater with push-on hand showers that fit
over existing hot and cold water taps.
PIPEWORK
The following notes are for general guidance only.
(i) the heaters performance may be affected if the installa-
tion has old pipework forming dead-legs or air reser-
voirs. Always ensure that any old pipework is either re-
moved or capped off immediately adjacent to the pipe-
work 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 adequate
flow at all draw-offs when usedindividually.
PUTTING INTO SERVICE
Open the gasand water service taps beneath the appliance.
Purge the gas and water supplies. Check for gas and water
soundnessat all heater and external pipework connections.
Fit the gas control knob and light the pilot by turning the
knob 90” anti-clockwise. It may be necessaryto purge the pi-
lot gas supply, if so, wait a few moments, return the gas
control knob to the off position and repeat (the pilot supply
will only purge when the gascontrol knob has been turned
90” anti-clockwise).
Turn the gas control knob fully anti-clockwise to the main
gasposition. If the pilot is now extinguished for any reason,
return the gascontrol knob to the off position and wait ap-
proximately 30 secondsfor the safety interlock to resetitself.
Replace the front cover ensuring that the rubber spacer is in
place behind the centre fixing screw, refit all fixing screws,
slide facia plate down, replace the gascontrol knob and tem-
perature control knob ensuring that the knob indicates “hot”
when turned fully clockwise.
Hand the User’s Instructions to the consumer and instruct in
the correct and safeoperation of the heater.
DRAINING THE HEATER
If the heater is not to be used for long periods it is recom-
mended that it be drained. Seethe Servicing Instructions for
how to drain the heater.
Fig. 6
6

servicinginstructions
Before commencing any servicing work, turn off the gasand
water at the gasand water inlet taps on the appliance.
Slide the bottom plastic trim forward to improve access.
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.
i) Clean the burner
ii) Clean the heating body (In hard water areas it may be
necessaryto descalethe heating body)
iii) Clean the pilot and thermocouple
iv) Clean the gasand water filters
v) Clean the water governor
vi) Changethe diaphragm every three years
1) FRONT CASING
To remove, pull off the gas control and temperature
control knob.
Slide facia plate upward to allow accessto centre fixing
screw.
Unscrew the top, centre and bottom fixing screws.
Pull off the casetaking care not to lose the rubber spacer
behind the centre fixing point.
2) BURNER
Unscrew the pilo tube clamping screw (A - fig. 7) and re-
move the clamp and tube.
Remove the burner manifold by unscrewing the two
screws(B - fig. 7).
Pull burner head assembly forward to remove, taking
carenot to trap the thermocouple or ignitor wires.
Fig. I
The burner head should be turned upside down and cleaned
by brushing.
Replace in reverse order making sure that the gasket bet-
ween the burner manifold and gas section is in place and
that the burner headassembly is correctly located on the two
spigotsat the rear.
3) HEATING BODY
Remove the flue bend from the top of the heat exchanger
by removing the clip and the two fixing screws. Lift the
flue bend off the heat exchanger taking care not to dama-
gethe 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.
To remove the heating body for further cleaning, the hea-
ter must first be drained.
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 re-
move the water governor plug (D - fig. 8) from the baseof
the water section and drain the water from the heater.
Replace the drain down valve and/or water governor
plug before proceeding.
Remove the burner (seesection 2).
Remove the screw holding the bottom of the heating
body skirt to the rear case.
Releasethe two union nuts on the heating body legs.
Remove the heating body.
In hard water areas it may be necessary to descale the
heating bcdy. 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.
Fig. 8 Fig. 9

servicinginstructions
Fill the heating body with this solution and leave until the
solution stops bubbling. Flush out the heating body tho-
roughly 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.
Re-assemble in reverse order ensuring that the skirt fixing
screwand 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 (seesection 2).
Unscrew the knurled pilot burner outer ring (E - fig. 9).
Unscrew the pilot body (F - fig. 9) with a 15 mm span-
ner. Clean by blowing or washing in water. Do not clean
the holes with awire.
Blow any dust out of the gassection.
Re-assemblein reverseorder.
5) THERMOCOUPLE
Remove the burner (seesection 2).
Remove the pilot (seesection 4).
Unscrew the thermocouple nut (G - fig. 10) from the
thermo-electric valve and remove it from the wire.
With a 7 mm box panner, unscrew the nut (H - fig. 11)
holding the thermocouple into the gassection.
Thread the thermocouple and wire up through the gas
section.
Replace in reverseorder.
6) SPARK ELECTRIQUE
Remove the burner (seesection 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 gassection.
Re-assemblein reverseorder, and note that the slot in the
connector on the end of the electrode cable is vertical
when pushed onto the cartridge.
7) THERMO-ELECTRIC VALVE
To replace, remove the thermocouple nut (G - fig. 10).
Unscrew cap from the side of the gas section and with-
draw 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 se-
quence is repeated.
8) MAIN GAS VALVE
To inspect and clean, remove the burner (seesection 2).
Disconnect the thermocouple and ignitor lead (see sec-
tion 5 and 6).
Remove the four screwsfastening the top of the gassec-
tion to the base (K - fig. 12) and the two screws at the
back (L - fig. 12),holding it to the rear case.
Lift the gassection top off the base.
Remove the complete gasvalve assembly by unscrewing
the brasscylinder that hastwo flats.
Dismantle the gas valve assembly by unscrewing the
hexagonal spring retainer from the top of the assembly.
Remove the spring and gasvalve and clean the valve sea-
ting.
Fig. 10 Fig. 11
8
Fig. 12

servicinginstructions
Replace the gasvalve facing rubber and gasvalve assembly
“0” ring if necessary.
Replace in reverseorder, ensuring that the hexagonal spring
retaining nut is screwed fully down and the whole assembly
is screwedfully down into the gassection.
Clean the filters by blowing or washing in water. DO NOT
useany solvents.
Replace ensuring that the coarse filter is fitted in the water
inlet and the fine filter in the gasinlet.
9) DIAPHRAGM
To replace, turn off the cold water supply,and gas.
Drain the heater by removing the water govemer plug
situated in the baseof 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 gassection.
Remove the water section complete with the dia-
phragm.
Replace in reverse order - NOTE - fit the water gover-
nor last. It is easier if the cold water inlet connection is
partially engagedbefore fitting the screwsand reconnec-
ting the union nuts.
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.
12) PIEZO CARTRIDGE
Pull off the electrode from the piezo cartridge.
Remove the screw holding the gascontrol cam and re-
move the cam (P - fig. 15).
Remove the two screws (Q - fig. 15) holding the retai-
ning 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
gasservice tap. This should be 20 mbar (8 ins w.g.).
The gasinstallation should be examined for any possi-
ble blockage if the pressureis incorrect.
Replace in reverseorder.
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 tans. unscrew the union nuts attaching
the taps to the heater, and remove the filters.
Drain the heater asin Section 3.
Disconnect the right hand heating body leg at the water
section and remove the venturi.
Clean or replace asnecessaryand re-assemblein reverse
order.
Fig. 13 Fig. 14 Fig. 1.5
9

FAULT FINDING CHART FOR CORVEC BRITONY II T
PROBLEM
WATER TEMPERATURE
i) Water rate too high (LP model)
ii) Insufficient gasflow
iii) Water governor sticking (Mains model)
iv) Incorrect venturi
v) No venturi fitted
Check water regulator
Check rate and user’stap is open
Remove and clean or replace
Replace (Mains model 3.65 mm
BURNER STAYS ON
YELLOW FLAMES
SOOT FORMED
UNSTABLE FLAMES
i) Air in pipework
ii) Gasvalve staysopen
iii) Venturi blocked
iv) Dirt on gasvalve facing
v) Loosejumper on house stop cock tap
vi) Dirt or foreign matter in water section
i) Heating body tins blocked
ii) Primary air supply restricted
iii) Wrong injectors
i) Water in gasline
Check for “dead-legs”
Clean and greasegasspindle
Remove and clean
Strip and clean gasvalve
Replace water stop tap or pin down
Clean water section
Remove heating body an clean
Check burner manifold and clean
Check injector sizes
Check terminal position and flue ducts
HEATING BODY
NOISE
i) Scale Descale heating body
ii) Excessivegas Check gaspressure(seepage3)
iii) Insufficient water flow seebelow
INSUFFICIENT
WATER FLOW
i) Water service tap partly closed
ii) Blocked venturi
iii) Low water pressure
iv) Water governor faulty
v) Water governor sticking
vi) Foreign matter in water section
vii) Water regulator (LP model)
Check it is fully opened
Remove and clean venturi
Check water pressure
Changegovernor
Remove and clean or replace
Remove and clean
Adjust
10

FAULT FINDING CHART FOR CORVEC BRITONY II T
PROBLEM CAUSE REMEDY
PILOT FLAME
DOES NOT LIGHT
i) Gas servicetap closed
ii) Air in pipe
iii) Pilot injector blocked
iv) No ignition spark
Open service tap
Purge line
Clean or change
Check electrode, lead and ignitor
POOR PILOT FLAME
i) Pilot injector dirty/damaged
ii) Wrong injector
iii) Pilot headblocked
iv) Faulty pilot tube
Clean or change
Change for correct diameter (0.23 mm)
Clean
Clean or replace
PILOT WILL NOT
STAY ALIGHT
i) Thermocouple not working
ii) Thermo-electric valve faulty
iii) Gas pressurelow/variable
iv) Terminal wrongly positioned
v) Badly assembledflue
vi) Gas pressuretoo high
Changethermocouple
Changevalve
Check at inlet to heater (seepage3)
Re-position heater (seepage3)
Refit - check sealing
Check with British Gas
MAIN BURNER
DOES NOT LIGHT
i) Gas service tap not open fully
ii) Gas pressurelow
iii) Water rate low
iv) Gas valve not opening
v) Diaphragm punctured
vi) Venturi blocked or loose
vii) Gas control tap faulty
viii) Wrong injector
Open fully
Check at manifold and at inlet with
heater running (seepage3)
Check if water rate is sufficient (page3)
Check (v) and (vi)
Changediaphragm
Check venturi
Check operation of User’s gascontrol tap
Check for correct diameter (1.13 mm)
EXPLOSIVE IGNITION
GAS CONTROL TAP
STIFF (USER’S)
i) Pilot
i) Greasedried
ii) Operating mechanism replaced
incorrectly
Check pilot tube and injector
Clean and regrease
Refit
11

CHAFFOTEAUX LIMITED
Concord House, Brighton Road, Salfords, Redhill, Surrey RHl 5 DX. Telephone : Horley (02934) 72744 - Telex : 87378. 03
ESPOOG g