Chaffoteaux & Maury BRITONY FF Release note

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BRITONY FF
installation
servicing instructions
(leave these instructions adjacent to the gas meter)

Supplied By www.heating spares.co Tel. [phone]
I
1.
GENERAL
The BRITONYFFis a fanned draught, balanced flued instantaneous multipoint water heater. The flue is suitable
for beck outlet, front outlet or to either side.The maximum recommended flue length is 3 m. straight.
The appliance isfor connection to a mains cold water supply only.
A permanent electrical connection is required and should be provided by use of a fused spur. If the appliance is
installed in a bathroom the fused spur must be external to the bathroom.
When on pilot only the fan runs at ‘low speed’ increasing the normal speed when there is a demand for hot wa-
ter. Included are a pressure switch, which operates if the fan stalls or if the flue is obstructed, and a low tempe-
rature sensor which will turn off the fan when the appliance is running on pilot only (fan low speed) in the event
of low air temperatures likelyto causefreezing in the appliance.
1.1 Guarantee
The guarantee on this appliance isvoidable if it isnot installed in accordance with the recommandations made he-
rein as in manner approved by the manufacturer.
1.2
Dimensions
A
B
C
D
E
F
G
H
J
K
1
M
N
P
R
S
T
v
mm ins.
658 25.9
395 15.5
270 10.6
100 4.0
40 1.6
385 15.15
438 17.25
778 30.6
728 28.6
53 2.1
55 2.15
98 3.8
70 2.75
285 11.22
457 18.0
105 4.13
199 7.8
340 13.4
, D0 Ed k-“/1
<
I
I
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1.3
1.4
Technical Data
Heat input nominal ..........................
Heatoutputnominal ........................
Gasrate (maximum) .........................
Burner pressure ............................
Main burner injectors ........................
Pilot injectors ..............................
Water flow rate - raised 50 “C (90 "F)...........
Water flow rate - raised 30 “C (54 "F)...........
Minimum operating head ....................
Maximum operating head ....................
Electrical Connections - 240 V single phase 50 Hz
supply fused 2 amp.
28.6 kW
22.4 kW
2.67 m3/h
10.9 mbar
6.3 I/min
10.9 I/min
7.5 m.
100 m.
4.37 in.w.g
1.23 mm
0.23 mm
97583 Btu/h
76565 Btu/h
94.3 ft3/h
1.4gpm
2.4 gpm
25 ft ( 10 psi)
328 ft (150 psi)
The minimum water pressure is for the correct operation of the heater only. An additional allowance must be
made for the resistance of pipework and fittings particularly where showers and washing machines are used.
This should be equivalent to 2 m. (6.5ft) head.
Water inlet (Compression type fittings) ...
Water outlet Kompression type fittings)
Gas(Compression type fittings) .........
Height (including flue bend) .............
Width ...............................
Depth ...............................
Weight ..............................
Spacefor fixing - top .................
- bottom .............
- sides ...............
- front ...............
Holefor wall liner .....................
The BRITONYFF issupplied in one carton.
.
Right hand connection
Left hand connection
Centre connection
778 mm (30.6 in)
395 mm (I 5.5 in)
270 mm (IO.6 in)
20 kg. (42 lb)
50mm( 2in)
178 mm ( 7 in)
25 mm ( 1 in)
600 mm (24 in)
4 in. diameter.
15 mm Copper
15 mm Copper
15 mm Copper
Flue Length
Minimum WallThickness 3” 3” (75 mm)
RearOutlet Wallthichess Upto612.5mm
Deliveredwith
appliance
Flue tube length = wall thickness + 25mm
Air inlet tube length = wall thickness + 25mm
Over612.5mm
Extensionavailable
PtN”61061
SideOutlet
EM= Wallthichess
DM = Distancefromwalltocase
EM upto 500mm
+DM 500mm to 1400
Deliv. 1extn.
with Ptr
appliance 61061
Flue tube length EM + DM + 130mm
Air inlet tube length EM + DM + 130mm
1401mm
to2300
2extn.
2x
61061
2300mm
to2187
3extn.
3x
61061
3

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2. INSTALLATION REQUIREMENTS
I I IMinimumspacing
TerminalPosition Farmed I
2.1
Related Documents
The installation of the heater must be in accordance with
the relevant requirements of the GasSafety Regulations
1972, Building Regulations, IEEWiring Regulations and-the
Byelaws of the local water undertaking. It should also be
in accordance with any relevant requirements in British
Standard Codes of Practice. Detailed recommendations
are contained in the following British Standard Codes of
Practice :
BSCP331 : Pt. 3 : 1974., BS5546 : 1979, BS5440 : Pt. 1 :
1978 and BS5440 : Pt. 2 : 1976.
2.2 Location
The location chosen for the heater must permit the pro-
vision of a satisfactory flue termination. The location
must also permit adequate spacefor servicing and air cir-
culation around the heater.
The heater may be installed in any room or internal space
although particular attention is drawn to the require-
ments of the IEEWiring Regulations and, in Scotland, the
electrical provisions of the Building Regulations applicable
in Scotland, with respect to the installation of a heater in
a room or internal spacecontaining a bath or shower.
Where the installation of the heater will be in an unusual
location special procedures may be necessary and BS
5546 gives detailed guidance on this aspect.
A compartment used to enclose the heater must be de-
signed and constructed specifically for this purpose. An
existing cupboard or compartment may be used provided
that it is modified for the purpose.
Details of essential features of cupboard/compartment
design are given in BS5546.
2.3 Gas Supply
An adequate gas meter must be connected to the service
2.5
pipe. Where necessary the local GasRegion of British Gas
will arrange for the existing meter to be ckecked or for a
suitable meter to be installed. On no account must any
work be cerried out on the gas meter other than by the
local Gas Region or their specifically authorised contrac-
tor.
Installation pipes should be fitted in accordance with CP
331 : 3. Pipework from the meter must be of adequate
size. Pipes of a smaller size than the gas connection
should not be used.
The complete installation must be tested for gas sound-
2.6
ness.
2.4 Siting the Flue Terminal
The standard flue set is suitable for walls having a thickn- I
ess of 75 mm (3 ins.)to 355 mm (14 ins.).Other flue op-
tions are available to a maximum of 3 m (13 ft. 2 ins.)to 2-7
specialorder.
Detailed recommandations for flueing are given in BS
5440 : Pt. 1. The following notes are intended to give ge-
neral guidance.
The heater must be installed so that the flue terminal is
exposed to external air. The heater must NOTbe installed
so that the terminal discharges into another room or spa-
ce such as an outhouse or lean-to. It isimportant that the
position of the terminal allows a free passage of air
across it all times. The minimum acceptable spacings
from the terminal to obstructions and ventilation ope-
nings are specified below :
1. Directlybelowanopenablewindow,airvent
oranyotherventilationopening. 300mm(12in.)
Aboveadjacentgroundorbalconylevel.
Fromverticaldrainuir.xsorsoilDioes.
6. Frominternalorexternalcomers.
7. Fromasurfacefacingtheterminal
8. Fromaterminalfacinatheterminal
25mm(1in)
600mm(24in)
1200mm148in.)
Note - Where the terminal is fitted within 850 mm (34
ins.)of a plastic or painted gutter or 450 mm (18 ins.)of
painted eaves an aluminium shield of at least 750 mm (30
ins.)long should be fitted to the underside of the gutter
or painted surface.
Where the lowest part of the terminal is less than 2 m.
(6.5ft) above the level of any ground, balcony, flat roof
or placeto which any person hasaccessand which adjoins
the wall in which the terminal is situated must be protec-
ted by a guard of durable material (a terminal guard is
available from Chaffoteaux Limited) or from Tower Flue
Components. Tonbridge 351555.
The air inlet/products outlet duct and the terminal of the
heat must not be closer than 50 mm (2 ins.)to any com-
bustible material. Detailed recommendations on the pro-
tection of combustible material are given in BS 5440 Pt.
1 : 1978 (Sub-clause20.1).
IMPORTANT NOTICE: TIMBER FRAMEDHOUSES.If the
appliance is to be fitted in a timber framed building it
should be fitted in accordance with the British Gaspubli-
cation “Guide for GasInstallations in Timber Framed Hou-
sing” reference DM2. If in doubt advice must be sought
from the localGasRegionof British Gas.
Preparing the Wall
The heater should be installed on a flat non-combustible
material which will not reverberate. Whatever the thick-
ness of the wall make a hole 100 mm (4 ins.)in diameter,
a core drill would be suitable.
For dimensions and clearances see Page2 and Technical
Data Page3.
Slidethe wall liner through the wall.
Fitting the Flue Terminal
The flue terminal may be fitted from inside or outside of
the building. If fitting from inside the terminal should be
fitted into the flue liner and the assembly passedtrough
the hole in the wall. The outside diameter of the terminal
isthe same asoutside diameter of the tube.
Air supply
The heater does not require any purpose provided venti-
lation unless installed in a compartment. A compartment
enclosing a heater requires high and low level openings.
These openings must either communicate with a room or
internal space or be direct to outside air. The FREEarea
of the opening must be :
Highlevel Lowlevel
Air fromroomor internalspace 258cm2(40in.2) 258cm2(40in2)
Airdirectfromoutside 129cm2(20in.? 129cm*(20in.21
4

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2.8 Electrical Connections
These appliances must be earthed.
The installation should be undertaken by a competent
electrician and should be in accordance with the current
edition of the IEEWiring Regulations.
Particular attention should be paidto cross bonding.
The heater should be provided with a means of isolation.
If installed in a bathroom the means of isolation must be
external to the bathroom or a double pole cord switch
fitted.
A three core cable should be used and a cable of
0.75 mm2 is considered suitable. The cable should be pas-
sed through the clamp on the top of the heater and the
clamp tightened to secure the cable. Connection to the
heater should be made in accordance with diagram (page
8).
2.9 Description of Operation
The controls on the BRITONYFFare comprised of range
of thermal, electric and electronic switches. Broadly, the
thermal controls are for the pilot flame supervision, the
electrical controls are functional switching and the elec-
tronic controls act as a security for the functional con-
trols
The circuit is designed so that, under normal conditions,
the fan runs continuously at low speed and automatically
changes to high speed when the gas valve opens. If,
however, the incoming air temperature approaches 0 “C
the integral frost protection thermostat interrupts the
low fan speed signal. Under this condition, if there isa de-
mand for hot water, then the fan recommences at high
speed. There is an in-built delay circuit to prevent the
safety devices operating prematurely.
The pilot can only be established under the control of the
thermocouple flame failure circuit after the mains electri-
city connection is made since it is dependent upon the
energising of the relay - RLI.
In the start mode indicated by the solid line, relay RL2 is
energised allowing a signalto be passedto relay RLI. This
circuit is completed through the normally closed contacts
on the pressure switch. At the same time the micro-
switch passes a supply to the fan which runs on low
speed.
The microswitch is operated by a lever which is actuated
by the gas valve as a result of a water flow causing the
diaphragm to rise.
When there is a demand the main gas valve opens auto-
matically and the microswitch causes the fan to go to
high speed resulting in :
a)the pressure switch to transfer to the normally open
(high speed)connection, and
b) relay RL2, now having the same potential across the
coil, releasesallowing the contacts of SW1to change over
from T to R. The route the indicated by the dotted line
Fig. 4. During the,switching time relay RLI is held in by a
;chch,‘ge capacrtor thus preventing nuisance pilot
If the air flow is not proved on high speed the circuit is
incomplete since the pressure switch does not change
over and therefore the flame failure device will operate
by interrupting the thermocouple as a result of the failu-
re of the circuit through relay RLI.
Additional security is provided for the condition where,
because the linkage is mechanical, the main gas burner is
initiated by the microswitch has remained in the low fan
speed position.
n.b. This circuit does not function when the fan operates
at high speed. Inthis casethe ionisation circuit is comple-
ted by the flame. A field effect transistor complete the
circuit completes and drops out the FFDrelay RLI. If the
burner issensed in the low fan speed circuit the appliance
fails safe.
FUNCTIONAL FLOW DIAGRAM
THERMOSTAT
1r 17
THERM0
MICRO SWITCH L RELAY
r RLl + ELECTRIC
VALVE
GAS VALVE FLAME 4
5

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CIRCUITDIAGRAM
L
WIRING
DIAGRAM ELECTRICAL
CONNECTION
fuse 2 amp heater
neutral I q !o i
earth i-.-.-.-i
switched fused spur
NB : IF HEATER INSTALLED IN A BATHROOM
SPUR MUST BE EXTERNAL TO ROOM
--------------------
NB : IF HEATER INSTALLED IN A BATHROOM
SWITCH TO BE OF PULL CARD TYPE
heater
I-.-‘-.-I I-‘-I -.-II
live ; w i . .
I 01
. I4 I
neutral I t I !&da i
.
earth I . I I *I
i-.-.-.-i i-.-.i
2 amp. fuse way double pole
switch
6

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3.
INSTALLING THE HEATER
3.1
3.2
The heater isattached to the wall by a wall bracket and two screws at the bottom.
The bracket and screws are supplied in a box together with the gas and water service taps, gas control knob and
temperature selector knob. The box ispacked in the appliance case.
Fitting the heater - Remove the front case by unscrewing the four fi-
xing screws positioned at the top bottom and cen-
tre of the appliance.
- Ease the front case off the top locating lugs by
pulling forward to clear the water section at the
baseof the appliance.
- Set out and drill hole for flue using a 4 in. core drill.
- Using dimension (V)on Page 3 drill and rawplug the
wall and fit bracket to the wall.
- Adjust bracket if necessary to ensure that dimen-
sion (V)is maintained along the length of the bra-
cket and finally secure in position.
- Hangthe heater on the bracket.
- Mark the two fixings at the bottom of the heater,
drill and plug the wall. Securethe heater to the wall
using the screws provided.
Fitting the Flue
/
- Measure the wall thickness and cut flue duct and
wall liner to length, see 1.4.
- Peel off protective paper from adhesive side of
cork gasket A and place on mating side of flue tur-
ret Blining up screw holes and press down.
- Assemble flue duct on to flue tube section using
rubber sealing ring provided.
- Fit locking ring and 0 ring overliner C.
- Fit flue duct and turret so that it engages into the
terminal.
- Engage locking ring over legs by turning in an anti-
clockwise direction viewed from behind turret.
- Passthe assembled flue through the wall.
- Seat the turret onto the top of the heater ensu-
ring the gaskets are in position.
- Securewith 4 screws provided.
- Do not fit turret cover or the front cover until elec-
trical connections have been made and the heater
tested for gas and water soundness.

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3.3
3.4
3.5
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 sealthe connection. Fit the nut and olive
on the gas 15 mm gas supply pipe using suitable
sealant and tighten.
Water Connections -
Remove the plastic covers protecting the water
inlet and the water outlet connections.
- Fit the water service tap provided to the right hand
connection at the bottom of the heater using the
coarse filter washer to sealthe connection.
- Fit the nut and olives on the supply and delivery
pipes using suitable sealant. The inlet supply to the
water service tap and to the outlet delivery side of
the heater (left hand connection). The water
service tap supplied with the heater incorporates a
drain plug.
3.5.1. Pressure Switch
- Connect the wires at the top of the heater to the
pressure switch.
- The
grey wire is connected to normally closed (NC
I) contact.
- The
pink wire to the normally open (NO2)contact.
- The
violet wire to the common (P)contact.
- Fit the flue bend cover passing the wire through
one of the slots provided and securing with the
thread forming screws provided.
- Seefigure
3.5.2. Mains Connection
-
Pass 0.75 mm2 heat resisting cable through cable
gland.
- The earth wire (green yellow) must be connected
to the earth pillar.
- The live (brown) and neutral (blue) should be con-
nected as indicated into the terminal block.
- Checkthat component plugs are pushed home.
- Checkfor continuity, polarity and earthing.
8

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APPLICATIONS OF THE BRITONY FF
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 hot water draw-off
points in the installation, If more than one outlet is open
simultaneously the total flow of water cannot exceed
that quoted inthe Technical Data.
The heater is comptatible with most current automatic
washing machines but care should be taken to ensure
that the machine is capable of accepting water at the de-
sign flow rate of the heater. Hot and cold fill machines
normally require a hot water temperature of 60 “C
(160 “F), the heater producing approximately 6.5 Vmin
(1.44gpm) at this temperature. The advice of the was-
hing machine manufacturers should be sought but gene-
rally it isonly necessary to remove the water flow restric-
tor (if fitted) in the hot water inlet connection of the ma-
chine to obtain a satisfactory heater operation.
Contact Chaffoteaux Limited for details of those machi-
nes known to be compatible with the BRITONYFF.
The heater can be used to supply hot water to a separate
shower draw-off. The heater should not be used to sup-
ply more than one shower mixing valve. The recommen-
ded pipework arrangement for a single shower head is
shown above. Onlythose fittings detailed should be used
with the heater. Chaffoteaux Limited do not supply the
water governor or any shower fittings. For local suppliers
of these pleasecontact :
Water governor - Dereve (FlowControls) Limited
Unit 1, Dudley RoadWest,
Tividale,Sandwell,B69 ZPF
West Midlands- 021 520 1337
Shower Accessories-Walker Crossweller and Co. Ltd.
Whaddon Works, Cheltenham
‘30~s.CL525EP
Tel :[phone]
Do not use the heater with push on hand showers that fit
over existing hot and cold water taps or with mixer taps
unless both supplies come from the same source. Sho-
wers forming part of bath mixers are not recommended
for satisfactory operation of the appliance.
4.1 Pipework
The following notes are for general guidance only.
0) The heaters performance may be affected if the in-
stallation has old pipework forming dead-legs or air
reservoirs. Always ensure that any old pipework is ei-
ther removed or capped off immediately adjacent to
the pipework that will be in use.
(ii) The sizeof the pipework between the heater and the
various draw-off points should be sized to ensure an
adequate flow at all draw-off points when used indivi-
dually.
(iii) A check should be made of all stop cocks in the inco-
ming supply and it should be ensured that they are of
the fixed jumper pattern. Loosejumpers can be pin-
ned on soldered into position.
4.2 A water reservoir is provided on the outlet sideof the
heat exchanger to limit the water temperature due to
((after heat )).
Aqualisa Products Limited
Horton’s Way, London Road,
WESTERHAM,Kent, TN16 IBT
Tel :Westerham (0959) 63240
9
9

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5. COMMISSIONINGTHE HEATER
5.1
5.2 Gas Pressure
Putting into Service
- Open the gas and water service taps beneath the
appliance, purge the gas. Turn on an adjacent tap
and purge the water side of the installation. Close
tap. Check for gas and water soundness at all hea-
ter and external pipework connections.
- Fit front cover by locating bottom first and ensu-
ring top of cover locates over bracket. Secure with
4 screws previously removed ensuring plastic was-
hers are in place.
- Fit the gas control knob (A) and light the pilot by
turning the knob 90 ’ anti-clockwise. It may be ne-
cessary to purge the pilot gas supply, if so, wait a
few minutes, return the gas valve to the OFFposi-
tion and repeat (the pilot supply will only purge
when the gas control knob has been turned 90’
anti-clockwise).
- Switch on electrical supply, fan will run at low
speed.
- Turn the gas control 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 before repeating.
- Turn on an adjacent hot water off point, the hea-
ter will now light and the fan draw change to nor-
mal speed.
- Test for gas soundness around the heater gas
components using a leak detection fluid.
- Check the burner setting pressure at the pressure
test 0 point in the base of the appliance after
continuous operation for IO minutes with front co-
ver fitted.
- If the burner setting pressure is not correct, check
that the pressure at the gas tap, test point is
20 m,bar (8 in.w.g.) with the appliance operating. If
the inlet pressure is not correct, check for any pos-
sible 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 pre-set and non-ajustable.
10
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5.3
5.4
Flame Failure
Checkthe operation of the flame failure device on the heater by blowing out pilot light. The flow of gasto the pi-
lot will ceaseand the thermoelectric valve drops out with an audible ‘click’ within 30 seconds.
5.5
Handing Over
Handthe User’s Instructions to the user or purchaser,and instruct in the correct and safe operation of the hea-
ter.
Explainto the user or purchaser that if the heater is not to be used for long periods it is recommended that the
heater is drained, this is particularly important during the winter months (see servicing instructions for how to
drain heater).
Finally,advise the user or purchaser that, for continued efficient and safe operation of the heater it is important
that adequate servicing iscarried out at intervals recommended by the localgas region,
- Check burner ignition which should be smooth and
quiet (not explosive).
- If slow ignition requires adjustment. Proceed as in
6.1 to remove front cover.
- Adjust slow ignition l/4 turn at a time. Refit front
cover and test operation. Screwing A out speeds
up ignition. Screwing in delays ignition.
- Refit front cover.
11
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6. SERVICINGINSTRUCTIONS
Before commencing any service work :
1. Isolate electrical supply.
2. Turn off gas at gas service tap.
3. Turn off water at water inlet tap.
4. Drain water heater by turning off water service tap opening hot water outlet tap and removing drain plug in
the water service tap.
6.1 Front Casing
6.2
6.3
To remove :
- Pull off gas control and temperature control
knobs.
- Remove four fixing screws (two at top one at the
bottom and one centre of the appliance).
- Pulloff case easing top forward first over top bra-
ckets and pulling forward and down to clear the
water section.
Burner
- Remove the combustion chamber front panel as
detailed in 6.4.
- Unscrew the pilot tube clamping screw (A) and re-
move the clamp and screw and pilot tube. Discon-
nect the pressure test tube from the left hand end
of the manifold.
- Remove the burner manifold by unscrewing the
four screws (B).
- Unplug ionisation electrode from the electrical box.
- Pull burner head assembly forward to remove ta-
king care not to trap the thermocouple or ignitor
wires.
- The burner head should be turned upside down
and cleaned by brushing.
- Replacein reverse order making sure that the gas-
ket between the burner manifold and gas section is
in placeand is in good condition. If necessary repla-
ce gasket and ensure that the burner head assem-
bly is correctly located on the two spigots at the
rear.
Pilot
- Remove pilot tube as in 6.2.
- Blowthrough the tube to remove any dust,
- Unscrew the knurled pilot burner outer ring (A).
- Remove flame retention gauze.
- Unscrew the pilot body (B)with a 15 mm spanner.
Cleanby brushing and blowing.
DONOTCLEANHOLESWITHA WIRE.
- Re-assemblein reverse order ensuring pilot body is
screwed down tightly.
NB: Where accessisdifficult it isadvisableto remove
the combustion chamber front panel as detailed in
6.4.
12
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6.4 Heating Body
a) The heating body can be examined in position :
- Remove two threaded screws which secure the
front panel of the combustion chamber skirt to the
flue hood (A).
- Remove three self-tapping screws on either side of
heat exchanger skirt(B).
- Prior to cleaning the heat exchanger adequate pre-
caution should be taken to protect the pilot bur-
ner/gas valve assembly to prevent the ingress of
dust etc.
- If additional cleaning is necessary, removal of heat
exchanger will facilitate greater acces.
- To remove heat exchanger proceed as in 6.4.2
- To remove heat exchanger.
b) To remove heat exchanger
- Turn off the water inlet tap and open an adjacent
water draw off point.
- Remove the drain plug from the side of the water
inlet tap. Drainwater by opening hot tap
- Remove combustion chamber front panel 6.4.1.
- Remove burner 6.2
- Slideout combustion lining and retain.
- Disconnect the unions on either side of the heat
exchanger.
- Remove two screws securing the combustion
chamber/heating body assembly to the rear panel.
- Remove heat exchanger and combustion chamber.
- Remove two screws at the rear of the combustion
chamber securing the combustion chamber to the
heat exchanger.
- Slideheat exchanger forwards.
6.5
Descaling Procedure
Periodically it may be necessary to remove scaledeposits from the waterways of the heater to ensure continued
and efficient operation.
The frequency of descaling will depend largely on the hardness of the water and your installer or local Region of
British Gasshould be contacted for advice.
13

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6.7
6.8
I
Main GasValve
To inspect and clean.
- Remove the burner (6.2).
- Disconnect the thermocouple from the therm0
electric valve and ignitor leadfrom the piezo.
- Remove the four screws fastening the top of the
gas section to the base and the two screws at the
back holding it to the rear case.
- Lift the gas section top off the base.
- Remove the complete gas valve assembly by uns-
crewing the hexagonal spring retainer from the
top of the assembly.
- Remove the spring and gas valve and clean the val-
ve seating.
- Replacefacing rubber washer on the gas valve as-
sembly and ‘0’ ring, if necessary.
- Replace in reverse order, ensuring that the hexa-
gonal spring retaining nut is screwed fully down
and the whole assembly is screwed fully down into
the gas section.
Water Governor
To clean
- Turn off the cold water supply to the heater and
drain into recepticle.
- Remove the governor situated in the base of the
water section.
- Cleanthe components with water.
- Checkthat the spring loaded piston moves freely.
- Replacein reverse order.
Gasand 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
- Cleanthe filters by blowing or washing inwater. DO
NOTuse any solvents.
- Replace ensuring that the coarse filter is fitted in
the water inlet and the fine filter in the gas inlet.
6.9
Microswitch
The microswitch operating mechanism isfactory set and sealedand should not require adjustment.
If the microswitch requires replacement proceed as in Section 7.12/7.13.
I I
6.10
Greasing of Components
Care should be taken during the annual servicing of an appliance to grease the gas valve spindle (see 6.6) and
diaphragm spindle (see7.5).Useeither graphited or siliconegrease.
14

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7
REPLACEMENTOF COMPONENTS
7.1
Thermocouple
- Remove the burner, see section (6.2).
- Remove the pilot, seesection (6.3).
- Trace conductor and disconnect at electrical box.
- Unscrew the thermocouple nut (A) from the ther-
moelectric valve and remove it from the wire.
- With a 7 mm box spanner, unscrew the nut(B) hol-
ding the thermocouple into the gas section.
- Thread the thermocouple and wire up through the
aas section.
7.2
7.3
7.4
- Replacein reverse order.
Spark Electrode -
- Remove the burner, see section (6.2).
- Remove the electrode retaining screw (A) with a
screwdriver placed insidethe heating body skirt.
- Pulloff the electrode cable from the piezo cartrid-
ge.
- Lift the electrode out of the gas section.
- Re-assemble 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.
Thermoelectric valve
- To replace, remove the thermocouple nut (A).
- Unscrew cap from the side of the gas section and
withdraw the thermoelectric valve.
NOTE - This heater is fitted with a safety interlock.
When the pilot isturned off, the heater cannot be re-
lit until the thermocouple cools down and the lighting
sequence isrepeated.
Water Section Venturi
- Drainthe heater as in Section (6).
- Disconnect the right hand heating body leg at the
water section and remove the venturi (A).
- Clean or replace as necessary and re-assemble in
reverse order.
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7.5
Diaphragm
- To replace,turn off the cold water supply and gas.
- Drain the heater by removing the water governor
plug situated in the baseof the water section.
- Disconnect heat exchanger mains connections.
- Unscrew the six screws (A) holding the water sec-
tion to the gas section.
- Remove the water section complete with the diap-
hragm.
- Replacein reverse order - NOTE-fit the water go-
vernor last. It is easier if the cold water inlet con-
nection is partially engaged before fitting the
screws and re-connecting the union nuts.
7.6 Piezo Cartridge
- Pulloff the electrode wire from the piezocartridge.
H - Remove the screw holding the gas control cam and
8
remove the cam (A).
0
c?
B
8
- Remove the two screws (B) holding the retaining
plate.
- Removethe piezocartridge and replaceif necessary.
ofi
- On reassembling the spring must be positioned by
922 means of the locating pins on each end of the
spring.
7.7 Heat Input
The heat input ispre-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. Thisshould be 20 mbar (8 in.w.g.).
The gas installation should be examined for any possibleblockage if the pressure isincorrect.
- Pulloff spade terminals - noting positions. Remove
bracket (A) securedby4 screws.
- Remove two screws securing fan assembly (B).
- Gently ease away from flue hood disengaging lug
at rear of fan.
7.9 To Replace Fuse or PCB -
isolate electrical supply.
- Remove fan, microswitch, pressure switch and ioni-
sation connectors.
- Remove 2 screws securing cover (A).
- Unplug (8 pin plug) the front PCB from the rear
PCB.
- The fuse ison the reverse side of the front PCB.
- Replacein reverse order.
- To remove the other board, remove the remaining
two screws (B).
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7.10
7.11
7.12
- Removethe front casing,see 6.1.
- Disconnect the electrical supply.
- Remove the two screws securing the microswitch
with the appliance at rest the plunger will be flush
with the switch plate to switch mating surface.
- With gasand electricity off turn on a draw off tap.
- The plunger should move back 1.5 mm.
- If the plunger moves correctly, replace the micros-
witch (see7.12).
- If the plunger does not operate replace the gas
and water section (see7.13).
To replace the microswitch
- Remove the front casing (see6.1)
- Disconnect the electrical supply.
- Remove the three leadsfrom the microswitch.
- Remove the two screws securing the microswitch
and insulating backing.
- Replacein reverse order.
7.13
To replace the gas and water section
To replace Ionisation probe
- Remove front case(6.1).
- Remove pilot tube (6.3).
- Remove burner see (6.2).
- The ionisation probe is connected to the burner by
two screws (A).
- Disconnect cable at electrical box (seefig. 5).
- Replacein reverse order.
I
To replace pressure switch
- Isolate electrical supply.
- Remove two screws securing the hood cover.
- Remove spade connections noting position.
- Remove 2 screws securing pressure switch.
- Disconnect low pressure tube noting position.
- Replacein reverse order.
- Turn off gas supply, isolate water supply and
disconnect electrical supply.
- Remove front casing(see6.1).
- Remove the burner (see6.2).
- Remove the three leadsfrom the micro-switch.
- Remove the thermocouple lead and conductor lead
from the control box.
- Disconnect the union at the rear of the gas section,
- Disconnect the two water connections from the
water section - mains inlet and water section to
heating body.
- Remove the two screws securing the burner base
to the rear chassis
- Withdraw assembly.
- Disconnect the electrode lead from the piezo
ignitor.
- Remove the four screws securing the burner base
to the gas section.
- Replacein the reverse order.
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8
8.1
8.2
8.3
8.4.1
8.4.2
8.5
8.6
FAULT FINDING CHART FORBRITONY FF
PROBLEM CAUSE REMEDY
Pilot flame does not light
i) Gasservice tap closed
ii) Air in pipe
iii) Pilot injector blocked
iv) No ignition spark
Openservice tap
Purge line
Cleanor change
Checkelectrode, leadand ignitor
Poor Pilot Flame
i) Pilot injector dirty
ii) Wrong injector
iii) Pilot head blocked
iv) Faulty pilot tube
VI Pilot injector loose
Cleanor change
Changefor correct diameter (0.23)
Clean
Cleanor replace
Tighten
Pilot will not stay alight
i) Noelectrical supply
ii) Thermocouple not working
iii) Thermocouple valve fault)
iv) Gaspressure low/variable
v) Terminal wrongly positioned
vi) Badlyassembled flue
Checkand establish supply
Change if output lessthan 8mv
Changevalve
Checkat inlet to heater (seepage IO)
Re-position heater (seepage 4)
Refit - check sealing
Main burner does not light
i) Gasservice tap not open fully Openfully
ii) Gaspressure low Checkat manifold and at inlet with
the heater running (seepage 3)
iii) Water rate low Check if water rate issufficient
(seepage 3)
iv) Gasvalve not opening Check (VIand (vi)
v) Diaphragm punctured Changediaphragm
vi) Venturi blocked or loose Checkventuri
vii) Gascontrol tap faulty Checkoperation of User’sgas
control tap
viii) Slow ignition device screwed
fully home Adjust - see 5.4
Burner .goes out
Dn hot water demand
i) Microswitch sticking
ii) Fannot switching to high speed
iii) Pressure switch defective
iv) Highpressure tube detached
v) Flueblocked
Replace
Check microswitch adjustment see p. 17
Replace
Refix
Checkand clear
Explosive Ignition
i) Pilot too small
ii) Slowignition not adjusted Check pilot tube and injector Checkand adjust (seepage 11)
Gas control tap stiff
(User’s)
i) Greasedried
ii) Operating mechanism replaced
incorrectly
Cleanand regrease
Refit
18

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8 FAULT FINDING CHART FOR BRITONY FF
8.7
8.8
8.9
8.10
8.11
8.12
PROBLEM CAUSE REMEDY
Low Water Temperature
i) Water rate too high
ii) Insufficient gas flow
iii) Water governor sticking
iv) Incorrect venturi
v) Mainburner injector dirty
Checkwater governor
Check rate and if user’stap isopen
Remove and cleanor replace
Replace(3.65 mm)
Cleanor replace
Burner stays on
i) Air in pipework
ii) Gasvalve stays open
iii) Dirt on gasvalve facing
iv) Dirt or foreign matter
in water section
v) Loosejumper on house
stop cock tap
Checkfor dead legs
Cleanand grease gas spindle
Strip and cleangas valve
Cleanwater section
Replacewater stop tap OFpin
down jumper
Yellow Flames -
Soot Formed
i) Heating body fins blocked
ii) Primary air supply restricted
iii) Wrong injectors
iv) Fanspeed incorrect
Remove heating body and clean
Check burner manifold and clean
Check injector sizes
Checkand replace if necessary
Unstable Flame
i) Water in gas line
ii) Faulty flue Purge
Checkterminal position and flue ducts
Heating Body Noise
i) Scale
ii) Excessivegas
iii) Insufficient water flow
Descaleheating body
Checkgas pressure (seepage IO)
Seebelow
Insufficient Water i) Water service tap closed
ii) Blocked venturi
iii) Lowwater pressure
iv) Water governor faulty
v) Water governor sticking
vi) Foreign matter inwater section
vii) Water filter blocked
Check it isfully opened
Remove and cleanventuri
Checkwater pressure
Changegovernor
Remove and cleanor replace
Remove and clean
Remove and clean/replace
19
19

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Chaffoteaux Ltd, Concord.House, Brighton Road, Salfords, Redhill, Surrey RH15DX. Telephone: Horley(02934) 7274.4.Telex: 87378.
ESPOII