CHAFFOTEAUX Britony II FF User guide

CHAFFOTEAUX LIMITED
BRITONY II FF
G.C.No 52.980.21
This appliance hasbeen tested and certificated by British Gas
For useon natural gas only)
installation and
servicing instructions
(leavethese instructions adjacent‘to the gas meter)

1.
GENERAL
The BRITONYIIFFisa fanned draught, balancedflued instantaneous multipoint appliance. The flue is suitable for
rear outlet, or to either side.The maximum recommended flue length is 3 m. straight.
The appliance isfor connection to a mainscold water supply only.
A permanent electrical connection is required and should be provided by use of a fused spur. The external elec-
trical supply should be via a double pole switch having 3 mm. contact separation in both poles. 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 to normal speed when there isa demand for hot water.
Included are a pressure switch, which operates if the fan stalls or if the flue isobstructed, and a low temperature
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 likely to causefreezing inthe appliance.
1.1
1.2
Dimensions
Guarantee
I
The guarantee on this appliance isvoid if it is not installed in accordance with the recommendations made herein
or in a manner approved by the manufacturer.
-
-
A
B
C
D
E
F
G
H
J
K
1
M
N
P
S
T
v
W
X
-
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
105 4.13
199 7.8
290 11.4
90 3.54
868 34.14
-
X
-
2

1.3
L
Technical Data
Water inlet (Compression tYpe fittings) . .
Water outlet (Compression type fittings)
Gas(Compression type fittings) .
Height (including flue bend) . . . .
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weight..............................
Spacefor fixing - top (above flue)
- bottom (below case)
- sides . . . . . . . . . . . . .
- front . . .
Holefor the air inlet duct . . .
The BRITONYIIFFissupplied in one carton.
97583 Btu/h
76000 Btu/h
94.3 ft3/h
4.4 in.w.g.
2 0.4 in.w.g.
Heat input nominal . . 28.6 kW
Heat output nominal . . . . . . . . . . . . 22.4 kW
Gasrate (maximum) . . . . . 2.67 ms/h
Burner pressure . . . . . . . . . . . . . . . . . . . . . . . 10.9 mbar
Burner pressure tolerance . 2 1.Ombar
Main burner injectors . . . . . . . 1.23 mm (stamped 1.23)
Pilot injectors . . . . . . . . . . . . . . . . . 0.23 mm (stamped 231
Water flow rate - raised 50 ‘C (90 ‘F) . . . 6.3 I/min 1.4 gpm
Water flow rate - raised 30 “C (54 “F) . . . . 10.9 I/min 2.4 gpm
Minimum operating head . . . . . . . . . . 7.5 m. 25 ft ( 10 psi)
Maximum operating head . . . . . . . . . . 100 m. 328 ft (I 50 psi)
Electrical Connections - 240 V 50 Hz
supply fused 3 A.
The minimum water pressure is for the correct operation of the appliance 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. (6.5 ft) head.
.
. .
. .
.
. .
.
. .
. .
. .
. .
. .
. .
. .
15 mm Copper
15 mm Copper
15 mm Copper
Right hand connection
Left hand connection
Centre connection
778 mm (30.6 in)
395 mm (15.5 in)
270 mm (IO.6 in)
20 kg. (42 lb)
50 mm ( 2 in)
178 mm ( 7 in)
25 mm ( 1 in)
600 mm (24 in)
107 mm ( 4 in) 0 (diameter)
1.4
Flue Length
Minimum WallThickness 3 in (75 mm)
RearOutlet Wallthickness Upto612.5mm
Deliveredwith
appliance
Flue duct length = wall thickness + 25mm
Air inlet duct length = wall thickness + 25mm
Over 612.5mm
Extensionavailable
ptN”61061
I
SideOutlet
EM= Wallthickness
DM = Distancefromwailto
Rue
Air inlet duct length EM + DM + 130mm

2.
INSTALLATION REQUIREMENTS
2.1
Related Documents
The installation of the heater must be in accordance with
the relevant requirements of the GasSafety (Installation
and Use)Regulations 1984, Building Regulations, the cur-
rent 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 Codesof Practice :
CP 331 : Pt. 3 : 1974.. BS 5546 : 1979, BS 5440 : Pt. 1 :
1978 and BS5440 : Pt. 2 : 1976.
2.2
Location
The location chosen for the appliance must permit the
provision of a satisfactory flue termination. The location
must also permit adequate space for servicing and air cir-
culation around the appliance.
The appliance may be installed in any room or internal
space although particular attention is drawn to the requi-
rements of the IEEWiring Regulations and, in Scotland,
the electrical provisions of the Building Standards applica-
ble in Scotland, with respect to the installation of a heater
in a room or internal space containing a bath or shower.
Where a room sealed appliance is installed in a room
containing a bath or shower, any electrical switch or ap-
pliance control, utilising mains electricity should be so si-
tuated that it cannot be touched by a person using the
bath or shower.
Where the installation of the appliance will be in an
unusual location special procedures may be necessary
and BS5546 gives detailed guidance on this aspect.
A compartment used to enclose the appliance must be
designed 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 sized gas meter must be connected to the
service pipe. Where necessary the local GasRegionof Bri-
tish Gaswill arrange for the existing meter to be checked
or for a suitable meter to be installed. On no account
must any work be carried out on the gas meter other
than by the local GasRegion or their specifically authori-
sedcontractor.
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-
nessand purged in accordance with CP331 : 3.
2.4
Siting the Flue Terminal
The flue must be installed in accordancewith BS5440 : Pt.
1.1978. The flue is suitable for STRAIGHTflue application
only.
Thefollowing notes are intented to give general guidance.
The standard flue set is suitable for walls having a thick-
ness of 75 mm (3 in.)to 612.5 mm (24 in.)for rear outlet
fluing or up to 500 mm (19,5 in.) for side outlet fluing.
Other flue options are available to a maximum of 3 m (9
ft. 8 in.)to specialorder.
2.5 Wall Mounting
The appliance should be installed on a flat non-
combustible material which will not reverberate. What
ever the thickness of the wall a hole 100 mm (4 in.)in dia-
meter will be required for the app!iance flue assembly. It
is recommended that a core drill be used to form this
hole.
For dimensions and clearances seesections 1.2 and 1.3.
2.6 Flue Terminal Assembly
The appliance must be installed so that the flue terminal
isexposed to external air. The appliance must NOTbe ins-
talled so that the terminal discharges into another room
or space such as an outhouse or lean-to. It is important
that the position of the terminal allows a free passageof
air across it all times. The minimum acceptable spacings
from the terminal to obstructions and ventilation ope-
nings are specified in the following chart.
1.
I I
Diily belowanopenablewindow,airvent
oranyotherventilationopening. I 300mm(12in.) I
I I
2. 1Belowqutterinq,drainpipesorsoilpipes. 1 75mm(3iIL)
13. I Belowbalconiesoreaves. 1 2OOmm(8ill.) 1
4. Aboveadjacentgroundorbalconylevel 3OOmm(12in.)
5. Fromverticaldrainpipesorsoilpipes. 7.5mm(3in.)
16. 1
Fromintemalorexternalcomers. 1 3OOmm(12in)1
7. Fromasurfacefacingtheterminal
8. Fromaterminalfacingtheterminal
600mm(24in)
1200mm(46h.)
Note -Where the terminal isfitted within 850 mm (34 in.)
of a plastic or painted gutter or 450 mm (18 in.) of pain-
ted eaves an aluminium shield of at least 750 mm (30 in.)
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 place to which any person has accessand 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 Quinnell Bar-
rett & Quinnell.01.639.1357. (GCNo 381.782)
The air inlet/products outlet duct and the terminal of the
appliance must not be closer than 25 mm (I in.) to any
combustible material. Detailed recommendations on the
protection of combustible material are given in BS 5440
Pt. 1 : 1978 (Sub-clause20.1).
IMPORTANT NOTICE: TIMBER FRAMED HOUSES.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 localGasRegion of British Gas.
The flue may be fitted from inside or outside of the buil-
ding. If fitting from inside the flue duct should be assem-
bled into the air inlet duct and the assembly passedtrough
the hole in the wall.Theoutside diameter of the terminal is
the same asoutside diameter of the air inlet duct.
4

2.7 Air supply
The appliance does not require any purpose provided
ventilation unless installed in a compartment. A compart-
ment enclosing an appliance requires high and low level
openings. These openings must either communicate with
a room or internal space or be direct to outside air. The
minimum FREEarea of the opening must be :
High level Lowlevel
Air frommomor internalspace 258cm2(40in2) 258cm*(40irL2)
Airdirectfromoutside 129cm2(20in.2) 129ails(20in*)
2.8 Electrical Connections
The appliancesmust 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 paid to cross bonding.
The appliance must 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 fit-
ted.
Acceptable methods of connection are :
1. A switched, double pole fused spur with 3 mm contact
separation on all poles.
2. A double pole switch where the supply must be suita-
bly fused 3 A.
3. An un-switched socket outlet compling with BS1363.
The method of connecting the plug brown wire to live (U
blue wire to neutral (N) and green/yellow to earth ( ),
seefig. 3.
A three core cable should be used and a heat resisting ca-
ble of 0.75 mm2(24x 0.2 mm) isconsidered suitable.
2.9 Description of Operation
The cable should be passed through the gland on the top
of the appliance and the clamp tightened to secure the
cable. Ensure current carrying conductors become taught
before earthing conductor should cable slip from the
cord anchorage. Connection to the appliance should be
made in accordance with diagram (seesection 3,6,2).
Readin conjunction with figs 1. 2 and 4).
The controls on the BRITONYIIFFare comprised of a ran-
ge of thermal, electric and electronic switches.Broadly,the
thermal controls are for the pilot flame supervision, the
electrical controls are functional switching and the electro-
niccontrols act as a security for the functional controls.
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 is a 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 relay-RLI.
If the air flow is not proved on high speedthe flame failure
device will operate by interrupting the thermocouple as a
result of the failure 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 but the microswitch has remained in the low fan
speed position. If the burner is sensed in the low fan
speed circuit the appliance fails safe.
ELECTRIC SUPPLY
FUNCTIONAL FLOW DIAGRAM
.
THERMOSTAT ’
L
r FAN
1r
17
AA
I
L
r I
THERM0 THERM0
MICRO SWITCH RELAY
- RL2 i RELAY L
7 RLl r ’ COUPLE -t ELECTR’C
VALVE
SAS VALVE I

CIRCUITDIAGRAM
L
2A
Fig. 1 *
WIRINGDIAGRAM
Fig. 2
FU Fura (2 A)
IE lonkatlon electrode
TC Themlocouplr
BM Themm4@ctt’lc Valve
SW Mlcmswltch
PR Pressure Switch
Y-C Yellow -Green
Br Brown
BI Blue
R Red
W Whlts
0 onnos
Bk Black
v VI&t
0 Grey
P Plnk
ELECTRICAL
CONNECTION
fuse 3 A heater
switched fused spur
NB : IF APPLIANCE INSTALLED IN A BATHROOM
SPUR MUST BE EXTERNAL TO ROOM
---------I----------
NB : IF APPLIANCE INSTALLED IN A BATHROOM
SWITCH TO BE OF PULL CORD TYPE
heater
neutral
earth
I 9 . !d’i i
.
1 . I
I *I
i-.,.-.-i i-.-.i
3 A. fuse way double pole
switch
Fig. 3
6

MICRO-SWITCH
WATERFLOW
PREBSURE SWITCH
,--w--w------- 11PRINTED CIRCUIT BOARD
Fig. 4
3. INSTALLING THE APPLIANCE
A vertical flat area is required for the appliance : 1006 mm high x 445 mm wide (39.6 in x 17.5 in).The surface on which
the appliance ismounted must be of a non combustible material.
3.1 Packaging
The appliance isattached to the wall via the mounting bracket and two bottom screw fixings. The appliance is packed in a
single carton. Remove contents from carton and check against list.
I) APPLIANCE- Assembled with trims.
21 FLUEASSEMBLY: a) Air inlet duct complete with terminal.
b) 2nd section flue duct (insideair inlet duct).
c) Flueturret with 1st section flue duct fitted.
d) Plasticturret cover.
3) ACCESSORYBOX- containing : - mounting bracket
- gas and water connections with washers, nuts and olives
- flue locking ring and ‘0’ ring seal
- 2 gaskets
- 4 wall mounting screws
- 4 turret fixing screws
- 2 turret cover fixing screws
- 1 gas control knob
- 1temperature selector knob
7

-.
3.2 Preparing and Preparation :
fitting the appliance
y---
- Remove the bottom trim by pulling forwards.
- Slide the controls facia plate (PIupwards to disen-
gage from retaining bracket.
- Releasethe front case by removing the four fixing
screws and washers positioned at the top, bottom
and centre of appliance.
1 142 1: 142 j
- --c
197.5 mm minimum I
7
.
--- !-
r I
I
I i
- Remove the front case by lifting off the top loca-
ting lugs and pulling forward to clear the water
section at the baseof the appliance.
NOTE : A template is not supplied with this appliance.
Particular care is therefore necessary to ensure that
the appliance mounting bracket isfitted level and po-
sitioned accurately, relative to the flue.
- Refer to the drawings opposite for rear and side
flue applications and/or to the dimensions given in
Section 1.4, refer alsoto Section 2.4 for flue termi-
nal siting.
- Set out and rill hole for flue using a 100 mm (4 in)
core drill.
- Using the dimension 290 mm (11.4 in) accurately
mark position for bracket.
- Drilland plug the wall.
- Fix bracket to wail using No. 12 screws provided,
ensuring that the bracket is level. If necessary ad-
just bracket, finally secure in position.
- Hang the appliance on the bracket, and re-check
for level. Mark bottom fixing holes, remove ap-
pliance, drill and plug the wall to suit No. 12 screws.
- Re-hang appliance and secure with screws provi-
ded.

3.3
3.4
3.5
Fitting the flue -
Measure the wall thickness and cut flue duct and
air inlet duct to required length, (seeSection 1.4).
- Peel off protective paper from adhesive side of
cork gasket (A) and place on mating side of flue
turret(B) lining up screw holes and press down.
- Fit locking ring (C) and ‘0’ ring over the air inlet
duct.
- Fit flue duct and turret so that it engages into the
terminal.
D - Engage locking ring over lugs by turning in an anti-
clockwisedirection viewed from behind turret.
- Passthe assembled flue through the wall.
- If long flue sections are used (up to 3 metres) and
difficulty is found, these can be assembled whilst
being passedthrough the wall.
- Seat the turret onto the top of the appliance ensu-
ring the gaskets are in position.
- Securewith 4 screws provided.
- Do not fit plastic turret cover or the front caseun-
til electrical connections have been made and the
appliance tested for gas and water soundness (see
Section 5.1).
- A sealing ring (D) is supplied which can be used to
sealthe air inlet duct to walljoint-externally.
- Makegood insidewall surface.
Gas Connection
Fit the gas service cock provided using the fine
c$
filter/washer to sealthe connection. Fit the nut and
oliveonto the 15 mm gassupply pipe and tighten.
’ andpurgeKP:331.3).
Test the complete gas installation for soundness
I Water connections
- Remove the plastic covers protecting the water in-
let and the water outlet connections.
- Fit the water service cock provided to the right
hand connection at the bottom of the appliance
using the coarse filter/washer to seal the connec-
tion.
- Fit the nuts and olives onto the supply and delivery
pipes.
- Connect the inlet supply to the water service cock
and tighten.
- The water service cock supplied with the appliance
incorporates adrain plug.
- Ensure that all water connections are fully tighte-
ned.
9

3.6
Electrical connections
3.6.1. Pressure Switch
-
Connect the wires at the top of the appliance to
the pressure switch.
- The grey wire is connected to normally closed (NC
I) contact.
- The pink wire to the normally open (NO21contact.
- The violet wire to the common (P)contact.
- Fit the flue turret cover passing the wire through
one of the slots provided and secure with the
screws provided.
- Seefigure.
3.6.2. 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
connected as indicated into the terminal block.
- Check that component plugs are pushed home.
- Check for continuity, polarity and earthing.
L
10
10

APPLICATIONSOFTHEBRITONYII FF
The appliance is designed to serve a varietv of hot water
draw off Points including washing machines and showers.
The appliance can be connected to all hot water draw-off
points in the installation. If more than one outlet is open
simultaneouslv the total flow of water cannot exceed
that quoted in the Technical Data.
The appliance iscomptatibie with most current automatic
washing machines but care should be taken to ensure
that the machine iscapable of accepting water at the de-
sign flow of the appliance. Hot and cold fill machines nor-
mally require a hot water temperature of 60 “C (140 ‘F),
the appliance producing approximately 6.5 Vmin
Vl.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 appliance operation.
Contact Chaffoteaux Limited for details of those machi-
nes known to be compatible with the BRITONYIIFF.
Do not use the appliance 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.
Showers forming part of bath mixers are not recommen-
ded for satisfactory operation of the appliance.
4.1 Pipework
The following notes are for general guidance only.
0) The appliance performance may be affected if the
installation 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 applianceand the
variousdraw-off points shouldbe sizedto ensurean ade
quate flow at alldrawoff pointswhenusedindiiually.
(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 or soldered into position.
......
..-.*.*::.:::.......
......... ......
_*.-.~.~.~.~_~.~.~.:::::.
HOT WATER
TO COLD TAPS DEREVE WATER ALTERNATIVE
POSITION
The appliance can be used to supply hot water to a sepa-
rate shower draw-off. The appliance should not be used
to supply more than one shower mixing valve. The re-
commended pipework arrangement for a single shower
head is shown above. Only those fittings detailed should
be used with the appliance. Chaffoteaux Limited do not
supply the water governor or any shower fittings. For lo-
calsuppliers of these pleasecontact :
4.2 A water reservoir is provided on the outlet side of the
heat exchanger to limit the water temperature due to
((after heat )a.
Water governor - Dereve (FlowControls) Limited
Park lane
HANDSWORTH
Birmingham 821 8LE
Tel :[phone]
Shower Accessories - Caradon Mira Ltd.
Cromwell Road,CHELTENHAM
Gloucester GL52 5EP
Tel :[phone]
Aqualisa Products Limited
Horton’s Way, London Road,
WESTERHAM,Kent, TN16 IBT
Tel : [phone]
11

5.
5.1
COMMISSIONING
Putting into Service
5.1.1. Open the gas and water service cocks beneath
the appliance, purge the gas supply (CP331:3).Turn
on an adjacent tap and purge the water side of the
installation.
Test for water soundness at all appliance and exter-
nal pipework connections.
Switch on electrical supplv, fan will run at low speed.
5.1.3. To light the pilot temporarily fit the gas
control knob (A) and light the pilot by turning the
knob 90’ anti-clockwise. It may be necessaryto purge
the pilot gas supply, if so, wait a few minutes, return
the gas control knob to the OFFposition and repeat.
(The pilot supply will only purge when the gas control
knob has been turned 90’ anti-clockwide).
5.1.4. When the pilot is lit turn the control knob (A)
fully anti-clockwise as shown in the diagram. Test for
gas soundness using leak detection fluid on all gas
connections.
5.1.5. Check the operation of the flame failu-
re device by blowing out the pilot light, the flow of
gas to the pilot will cease and the thermoelectric val-
ve should drop out with an audible ‘click’ within ap-
proximately 30 seconds.
5.1.6. Remove gas control knob (A).
5.1.7. Switch off electrical supply.
5.1.8. Fit front case by locating bottom first and en-
suring top of case locates over bracket. Securewith 4
screws and washers previously removed.
- The centre screw and plastic washer retains the
fascia mounting bracket.
- Replace the control fascia plate by sliding down
onto the support bracket.
- Fit bottom trim by sliding onto rails.
- Fit the gas control knob (A) and the temperature
selector knob (B). The temperature selector knob
should be pushed onto the spline until it locates.
Turn fully clockwise to (+I,reposition knob as requi-
red, so that indicator dot isopposite the (+)sign.
5.1.9. Switch on electrical supply.
- Light the pilot and turn gas control knob (A) fully
anti-cockwise to, the main gas position.
- If the pilot is now extinguished for any reason re-
turn the gas control knob to the OFFposition and
wait approximately 30 seconds for the safety in-
terlock to reset before repeating.
12
5.

5.2 Gas Pressure
- Turn on an adjacent hot water draw off, the ap-
pliance will now light and the fan will change to high
Speed.
- With the front case fitted, check the burner set-
ting pressure at the pressure test point U.
- If the burner setting pressure is not correct, check
that the pressure at the gas service cock, test
point is 20 mbar (8 in.w.g.) with the appliance ope-
rating. If the inlet pressure is not correct, check for
any possible blockage or restriction in the pipework
to the appliance. If the inlet supply pressure cannot
be corrected contact your local gas region. The
heat input to the appliance is preset and non-
ajustable.
.4 Microswitch
5.5
Slow Ignition
- Check burner ignition which should be smooth and
quiet (not explosive).
- If slow ignition requires adjustment proceed as in
Section 6.1 to remove front case.
- Adjust slow ignition device l/4 turn at a time. Refit
front case and recheck operation.
NOTE: Turning screw A clockwisedelays ignition.
The microswitch is factory set and should not require adjustment. When the appliance is at rest the fan runs
continuously at low speed. check operation as follows set temperature selector to +. open draw off. The fan
should now come to high speed before the burner ignites. On closing draw off burner should extinguish before
the fan resumes at low speed. If fan/burner operational sequence is NOTasdescribed consult or contact Chaffo-
teaux Ltd (Service Department).
The Pressure Switch
Check the operation of the pressure switch as follows : Open draw off, fan comes to high speed and the burner
ignites. Closedraw off, burner extinguishes and when fan resumes at low speed listen for the ‘click’ as the relay
changes over. This should be followed within 15 seconds by a lighter ‘click’ asthe pressure switch changes over. If
the time separation isgreater than 15 seconds or if the pilot extinguishes it suggests that the pressure switch is
incorrectly set and should be referred to Chaffoteaux Ltd (Sercice Department).
13
5.4

5.6
Thermoelectric Circuit
5.7
Handing Over
The Thermocouple Circuit is fitted with an interrupter so that if the air flow is not proved on high speed the cir-
cuit is incomplete and the flame failure device will operate. Inthe case of intermittant pilot failure or permanent
pilot failure the thermocouple circuit can be checked with a British GasMultimeter or suitable Millivolt Meter to
determine if the pilot failure is due to poor thermocouple output, high resistance through Relay-l contact or
faulty thermoelectric valve. (SeeSection 2.9 Fig.I).
Hand the User’ instructions to the user or purchaser and instruct in the correct and safe operation of the ap-
pliance.
Explainto the user or purchaser that if the appliance is not used for long periods it is recommended that the ap-
pliance is drained, this is particularly important during the winter months (seeservicing instructions for procedu-
re to drain appliance).
Finally,advise the user or purchaser that, for continued efficient and safe operation of the appliance it is impor-
tant that adequate servicing iscarried out at regular intervals.
14
14

6.
SERVICINGINSTRUCTIONS
6.1
6.2
6.3
Before commencing any service work :
1. Isolate electrical supply.
2. Remove bottom trim by sliding forward.
3. Turn off gas at gas service cock.
4. Turn off water at water service cock.
5. Drain the applianceby opening hot water outlet tap and removing drain plug in the water service cock.
Front Casing
To remove :
- Pulloff gascontrol andtemperature selector knobs.
- Remove controls facia plate by sliding upwards.
- Remove the four fixing screws which secure the
front case(top, bottom and centre) taking care not
to loose facia retaining bracket and washers.
- Remove the front case by lifting off the to locating
lugs and pulling forward to clear the water section
at the baseof the appliance.
Burner -
Remove the combustion chamber front panel as
detailed below.
- Remove two threaded screws which secure the
front panelof the combustion chamber skirt to the
flue hood (A)Section 6.4.
- Remove three self-tapping screws on either sideof
combustion chamber skirt (B)Section 6.4.
- Unscrew the pilot tube clamping screw (A)and re-
move the clamp and screw and pilot tube. Discon-
nect the pressure test point tube from the left
hand end of the manifold.
- Remove the burner manifold by unscrewing the
two screws (B)and two screws and washers (0.
- Unplug ionisation electrode at the connector.
- Withdraw the burner head assembly taking care
not to damage the pilot bvurner/electrode assem-
bly or the ignition leads.
- 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 isin good condition. If necessaryreplace
gasket and ensure that the burner head assemblyis
correctly located on the two spigots at the rear.
Pilot
- Remove combustion chamber front panel, burner
and pilot tube as in 6.2 if not already removed.
- Blowthrough the tube to remove any dust.
- Remove screw securing spark electrode. Lift out of
‘D’slot and easeto one side,
- 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.
15

6.4
Heating Body
6.5
6.6
a) The heat exhcanger can be examined in posi-
tion :
- Remove combustion chamber front panel as in
Section 6.2 if not already removed. Prior to clea-
ning the heat exchanger adequate precaution
should be taken to protect the pilot burner/gas val-
ve assembly to prevent the ingress of dust etc.
- If extensive cleaning is necessary, the heat exchan-
ger will need to be removed asfollows.
b) To remove heat exchanger
- 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 to seperate the components.
Care should be taken when handling the heating
exchanger to ensure that the fins are not dama-
ged.
- Replacein reverse order.
I
, Descaling Procedure
Periodically it may be necessary to remove scaledeposits from the waterways of the appliance to ensure conti-
nued and efficient operation.
The frequency will depend largely on the hardness of the water in each specific area. If this is necessary COntaCt
your localwater authority for advice.
Advice with regard to descaling isavailable from Chaffoteaux Ltd (ServiceDepartment).
To inspect and clean
- Remove the burner (seeSection 6.2).
- Disconnect the thermocouple at the PCBand igni-
tor leadfrom the piezo unit.
- Remove the four screws and washers 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, taking care
not to damage the cork gasket.
- Remove the hexagonal spring retainer (A)from the
top of the assembly (20 mm).
- Remove the spring and gas valve and clean the val-
ve seating (IS).
- Renewfacing rubber washer on the gas valve if ne-
cessary.
- 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.
16
16

Water Governor
6.10
6.11
To clean
- Turn off the cold water supplv to the applianceand
drain into receptacle.
- Remove the governor situated in the base of the
water section.
- Cleanthe components with water.
- Checkthat the spring loaded piston moves freely.
- Replacein reverse oder.
Gasand Water Filters
Gasand water inlet filters are fitted between the
inlet service cocks and the appliance.
- To clean, turn off the service cocks, unscrew the
union nuts attaching the cocks to the appliance
and remove the filters.
- Cleanthe filters by blowing or washing in water. DO
NOTUSEANYSOLVENTS.
- 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 is factory set and if the microswitch requires replacement or adjustment
proceed as in Section 7.12 and 7.13.
Pressure switch :
The pressure switch isfactory set. To replace or adjust proceed as in Section 7.10 and 7.11
Greasing of Components
Care should be taken during the annual service of an appliance to grease the gas valve spindle (see Section 6.6)
and the diaphragm spindle tsee Section 7.5).Useeither graphited or siliconegrease.
Heat Input
It is a requirement of the GasSafety (Installation and Use)Regulations 1984 that the burner pressure and gas
rate are checked each time an appliance is serviced, likewise the service engineer should satisfy himself with re-
gard to gas soundnessand the adequacy of combustion and ventilation air if this isappropriate.
The heat input is preset 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 cock. Thisshould be 20 mbar (8 in wg).
The gas installation should be examined for any possible blockage if the pressure is incorrect.
17

7
REPLACEMENT OF COMPONENTS
Before commencing any work involving component replacement :
1. Isolate electrical supply.
2. Turn off gas at the gas service cock.
3. Turn off water at the water inlet cock.
4. Drain the appliance by opening hot water outlet tap and removing the drain plug in the water servlce cock.
5. Remove the front casing (seeSection 6.1).
7.1
Thermocouple
7.2
Spark Electrode
Thermoelectric valve
7.4
Water Section Venturi
- Remove the burner (seeSection 6.2).
- Remove the pilot (seeSection 6.31.
- Trace the thermocouple and disconnect at the ter-
minal on the PCB.
- With a 7 mm boxspanner, unscrew the nut (B)hol-
ding the thermocouple into the gas section.
- Thread the thermocouple and wire up through the
gas section.
- Replacein reverse order.
- Remove the burner (seeSection 6.2).
- Remove the electrode retaining screw (A).
- Pulloff the electrode cablefrom the piezocartridge.
- Lift the electrode out of the gas section.
- Re-assemblein reverse order, and note that the slot
inthe connector on the end of the electrode cable is
vertical when pushed onto the cartridge.
NOTE: Spark gap is 3-5 mm
- To renew, remove the thermocouple conductor
lead nut (A).
- Unscrew cap (B) 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 appliance cannot be
relit until the thermocouple cools down and the ligh-
ting sequence is repeated.
-
Disconnect the right hand heating body leg from
the water section and remove the venturi (A).
- Clean or replace as necessary and re-assemble in
reverse order.
18
7.3

7.6
7.7
Diaphragm
- To renew ensure that the cold water supply and
gas are turned off.
- Drain the appliance by removing the water gover-
nor plug situated in the baseof the water section.
- ys;;ect the two water connections at the water
- Unscrew the six screws (A) which hold the water
section to the gas section.
- Remove the water section complete with the dia-
phragm.
- Carefully remove and inspect the plastic water sec-
tion top cover.
- Re-assemblein reverse order.
NOTE: Fit the water govenor last. It is easier if the
cold water inlet connection is partially engaged be-
four fitting the screws and reconnecting the union
- Disconnect the spark electrode lead from the piezo
unit cartridge.
- Remove the screw holding the gas control cam and
remove the cam (A).
- Removethe two screws(8)holdingthe retainingplate.
- Remove the piezo cartridge and renew.
- On reassembling ensure that the locating pins on
each end of the spring are correctly engaged in
their location holes.
- Disconnect electrical connectors from assembly.
Note positions.
- Remove two screws and washers (B)securing sup-
port bracket to flue hood.
‘- Remove the two screws and washers securing the
fan assembly to the flue hood.
- Releasewiring loom from support clip.
- Gently ease the fan assembly away from the flue
hood disengaging lug at rear of fan assembly.
- Remove two screws and washers (A) holding sup-
port bracket to motor.
- Re-assemblein reverse order.
NOTE: The dimension - back plate to front face of
impellor is :- 57.5 mm + 0.5 mm - 0.0 mm
19

7.8
To Replace Fuse or PCB Isolate electrical supply.
l
A
(A) FUSE: - Pullout fuse holder (A)from board and
slide fuse out of holder.
(B) PCB : - Remove connections (fan. microswltch.
pressure switch and ionisation lead
complete with sleeve)
- Disconnect mains sup~lv cable from
termtnals.
- Remove two nuts and washers (6) retai-
ning thermocouple and conductor lead.
- Remove fuse and ease board from
plastic retaining clips.
- Remove four screws and remove PCB.
- Re-assemblein reverse order.
7.9
7.10
7.11
To replace ionisation probe
- Remove pilot tube (seeSection 6.3).
- \. . - Remove combustion chamber front cover (seeSec-
tion 6.4 a).
- Disconnect ionisation lead.
- Remove screw (A)secunng probe to bracket.
- Pullout probe whilst feeding lead through burner.
- Replacein reverse order.
To replace pressure switch
-
Isolate electrical supply.
- Remove two screws securing plastic turret cover.
- Pulloff tag connectors from terminals.
- Remove low pressure tube from pressure switch.
- Remove two screws securing pressure switch to
bracket.
- Lift off pressure switch.
- Remove ‘0’ ring from spiggot on the underside of
the pressure switch.
- Replace in reverse order referring to colour coding
label on top of appliance.
Adjustment of pressure switch
a) If Pilot eXtinctiOn occur within 5/10 seconds of turning hot tap off, it is possible that the pressure switch isout
of adjustment. If the pressure switch remains inthe high flow position in excess of S/IO seconds after the fan
switching to low speed interruption of the thermoelectrical current to the flame failure valve occurs,
It is possible to adjust the pressure switch to ensure a rapid return of the pressure switch from high to low
flow.
Adjustment Sequence : - Adjusting the pressure switch
- Ensure the front caseison.
- Isolate electrical supply.
- Remove two screws securing plastic turret cover
and lift off cover.
- Remove terminal cover from pressure switch ex-
posing the adjusting screw (A).
- Set a multimeter to 240V scaleand connect it across
the common and one other terminal of the switch.
- Re-establish electrical supply and ensure that gas is
off at gas control.
- ‘Turn on a hot tap to give high fan speed.
- Using a suitable screwdriver screw the adjusting
screw (A) in until changeover of the pressure
switch contacts are observed.
- Screw out adjusting screw (A) 3 turns to achieve
the setting point.
- Checkoperationof the pressureswitch(seesection5.5).
- Replace the plastic terminal cover on the pressure
switch.
- Replacethe plastic turret cover and fixing screws.
b) If main burner extinction occurs during hot water demand, it is possible that the pressure switch is out of ad-
justment. Screw adjusting screw (A) out until flush with top of moulding, then follow adjustment sequence
above.
20