Saunier Duval Ecosy 2 SB 28E Operating manual

Hepworth Heating Ltd.,
Nottingham Road, Belper, Derbyshire. DE56 1JT
General/Sales enquiries:
Tel: [phone] Fax: [phone]
One Contact Local Service
Customer Services:
Tel: [phone]
Fax: [phone]
221879A.03.01
All replacement parts
All labour charges
All call-out charges
Thank you for installing a new Saunier Duval appliance in your home.
Saunier Duval appliances are manufactured to the very highest standard so we are pleased
to offer our customers a Comprehensive First Year Guarantee.
In the centre pages are to be found your Guarantee Registration Card, which we recommend you complete and
return as soon as possible.
If this card is missing you can obtain a copy or record your registration by telephoning the Heatcall Customer
Service number 01773 828100.
Our Guarantee gives you peace of mind plus valuable protection against breakdown by covering the cost of:
Guarantee Registration
This is a Cat I2H Appliance
Reference in these instructions to British Standards and Statutory
Regulations/Requirements apply only to the United Kingdom.
For Ireland the rules in force must be used.
The instructions consist of three parts, User, Installation and Servicing Instructions, which includes the Guarantee Registration
Card. The instructions are an integral part of the appliance and must, to comply with the current issue of the Gas Safety
(Installation and Use) Regulations, be handed to the user on completion of the installation.
Tobeleftwiththeuser
9221
❏
✔
❏
✔
❏
✔
Instructions for Use
Installation and Servicing
G.C. No. 41-920-30
REGISTER YOUR SAUNIER DUVAL APPLIANCE
FOR 1ST YEAR GUARANTEE PROTECTION
CALL 0208 247 9857
Ecosy 2
SB 28E
Condensing
System Boiler

2
221879A
General
The Ecosy 2 SB28E can provide room heating as part of a
centralheatingsystem.Thecentralheatingwatertemperature
can be adjusted on the boiler.
Domestic hot water can be provided via a hot water cylinder.
Once the controls are set the boiler operates automatically. It
is recommended that a room thermostat and programmer are
used to control the central heating system.
Ifthereisnoheatingdemandfor24hoursthenthepumpwillbe
operatedtopreventitsticking.Afrostprotectionprogramisalso
included.
Pleasereadtheseinstructionsandfollowthemcarefully forthe
safe and economical use of your boiler.
Gas Category
This boiler is for use only on G20 gas.
Gas Safety (Installation and Use) Regulations
In your own interests and that of safety, it is the Law that ALL
gas appliances are installed by a competent person in
accordance with the current issue of the above regulations.
Gas Testing and Certification
Theboileristestedandcertificatedforsafetyandperformance.
Itis,therefore,importantthatnoalterationismadetotheboiler
unless approved, in writing, by Hepworth Heating Ltd.
Any alteration not approved by Hepworth Heating Ltd., could
invalidatethecertification,boilerwarrantyandmayalsoinfringe
the current issue of the Statutory requirements.
Spare Parts
When replacing a part on this appliance, use only spare parts
thatyoucanbeassuredconformtothesafetyandperformance
specificationthatwerequire. Donotusereconditionedorcopy
parts that have not been clearly authorised by Hepworth
Heating Ltd.
CE Mark
ThisboilermeetstherequirementsofStatutoryInstrument,No.
3083TheBoilerEfficiencyRegulations,andthereforeisdeemed
tomeettherequirementsofDirective92/42/EEContheefficiency
requirements for new hot water boilers fired with liquid or
gaseous fuels.
Type test for purposes of Regulation 5 certified by:
Notified body 0063.
Product/production certified:
Notified body 0063.
The CE Mark on this appliance shows compliance with:
1. Directive 90/396/EEC on the approximation of the Laws of
the Member States relating to appliances burning gaseous
fuels.
2. Directive73/23/EEContheharmonizationoftheLawsofthe
Member States relating to electrical equipment designed for
use within certain voltage limits.
3. Directive 89/336/EEC on the approximation of the Laws of
the Members States relating to electromagnetic compatibility.
Control of Substances Hazardous to Health
UnderSection6ofTheHealthandSafetyatWorkAct1974,we
are required to provide information on substances hazardous
to health.
The adhesives and sealants used in this appliance are cured
and give no known hazard in this state.
Contents
Important Information
Introduction 3
Operating the Boiler 3
General Information 1 5
Boiler Position 2 7
Flue Location and Ventilation 3 8
Heating System 4 10
Installation Preparation 5 12
Flue Preparation 6 13
Boiler Fixing 7 15
Gas, Water and Condensate Conns. 8 15
Electrical Connections 9 16
Commissioning 10 18
Servicing 11 23
Fault Finding 12 27
Replacement Parts 13 30
CONTENTS DESCRIPTION SECTION PAGE No.
INSTRUCTIONS
FOR USE
INSTALLATION
INSTRUCTIONS
SERVICING
INSTRUCTIONS

3221879A
Important Information
Insulation Pads/Ceramic Fibre, Glass yarn
Thesecancauseirritationtoskin,eyesandtherespiratorytract.
If you have a history of skin complaint you may be susceptible
to irritation. High dust levels are usual only if the material is
broken.
Instructions for Use
Gas Leak or Fault
Ifagasleakorfaultexistsorissuspected,turntheboilermains
electrical supply off and turn off the gas supply at the meter.
Consult your local gas company or your local installation/
servicing company.
Electrical Supply Failure
The boiler will not work without an electrical supply.
Normaloperationoftheboilershouldresumewhentheelectrical
supply is restored. If not, the boiler safety cut-off may have
operated, please refer to the following section to reset.
Reset any external controls, to resume normal operation of the
central heating.
Reset Button
Refer to diagram 1 which shows the fascia behind the drop
down door.
If the burner goes out check the digital display. Flashing digits
on the display indicate a fault. Allow the boiler to cool down for
at least four minutes then press the ‘reset’ button. This should
restart the boiler.
ToobtainservicecallyourinstallerorHeatcall(SaunierDuval's
ownserviceorganisation)usingthetelephonenumbergivenon
the front page of these instructions.
9232
Diagram 1
PRESSURE
GAUGE
FASCIA
RESET
BUTTON DIGITAL
DISPLAY
MODE
BUTTON
Operating the Boiler
To Operate the Boiler
1. Checkthatallisolating valves areopenwiththeirslotsinline
with the length of the valve, see diagram 7.1.
2. A sealed pressurised system must be filled and
pressurised by a competent person.
Only operate the boiler when you are sure that the system has
been filled and pressurised. Check this by looking at the
pressure gauge which should read a minimum of 1.0bar, see
diagram 1.
3. Ifyouareinanydoubt about the boilerbeingfilledwithwater
contact your installation/servicing company or the local gas
company.
4. Check that the electrical supply to the boiler is ON at the
external isolator.
5. Set any remote controls as required.
6. If the display is flashing, press the 'reset' button, shown on
diagram 1.
7. The boiler should now operate.
Normalhandlingshouldnotcausediscomfort,butfollownormal
good hygiene and wash your hands before eating, drinking or
going to the lavatory.
Ifyoudosufferirritationtotheeyesorsevereirritationtotheskin
seek medical attention.

4
221879A
User Controls
Theboilerisfactorypresettosupplycentralheatingupto 70oC.
The operation of the boiler can be altered by using the ‘mode’
button. TemperatureSelectionandControlOptionsaredetailed
in sections 10.7 to 10.10.
Additional Options
Other modes are available by repeatedly pressing the ‘mode’
button. These cover fault indication and servicing and should
only be accessed by the service engineer. Repeated pressing
of the ‘mode’ button will eventually return the display to show
boiler temperature, see diagram 10.4.
To Turn the Boiler Off
It is preferable to leave the electrical supply on whenever
possible to permit operation of the built-in frost protection (see
‘Protection Against Freezing’ below) and daily pump exercise.
Toturnoffthecentralheatingusetheroomthermostatorclock/
timer.
For holiday mode, refer to section 10.7.
To turn off the boiler for servicing, isolate it from the electrical
supply. To turn it on again follow the instructions given in ‘To
Operate the Boiler’.
Maintenance and Servicing
If this appliance is installed in a rented property there is a duty
of care imposed on the owner of the property by the current
issue of the Gas Safety (Installation and Use) Regulations,
Section 35.
Servicing/maintenance should be carried out by a competent
person in accordance with the rules in force in the countries of
destination.
Toobtainservice,pleasecallyourinstallerorHeatcall(Saunier
Duval’sown service organisation)using the telephonenumber
on the front cover of this booklet.
Please be advised that the ‘Benchmark’ logbook should be
completed by the installation engineer on completion of
commissioning and servicing.
All CORGI Registered Installers carry a CORGI ID card, and
have a registration number. Both should be recorded in your
boilerLogbook. YoucancheckyourinstallerisCORGIregistered
by calling CORGI direct on :- 01256 372300.
Clearances
If the boiler is fitted into a compartment or cupboard do not use
the compartment or cupboard for storage.
Protection Against Freezing
The boiler has a built in frost protection programme as long as
the electricity and gas are left switched on.
This device only protects the boiler. Any other exposed areas
of the system should be protected.
If the mains electricity and gas are to be turned off for any long
periods during severe weather, it is recommended that the
whole system, including the boiler, should be drained to avoid
the risk of freezing.
Ifindoubt,contactyouinstallation/servicingcompanyforadvice.
Asasafetyfeaturetheboilerwillstopworkingifthecondensate
drain becomes blocked. The display will repeatedly flash ‘0’
then ‘8*’. During freezing conditions this may be due to the
forming of ice in the condense drain external to the house.
Releaseanice blockage by the useofwarmclothson the pipe.
Press the reset button to restart the boiler. Contact your
installation / servicing company if the fault persists.
Draining and Filling
Thisboiler worksinapressurisedsystemwhichmustonly
bedrained,refilledandpressurisedbyacompetentperson.
If the pressure gauge indicates a loss of system pressure, i.e.
lessthan0.7bar,theappliancewillshutdownshowingflashing:
‘1’then ‘2*’on the display. YOU MUST CONTACT YOUR
INSTALLER.
Pressure Relief Safety Valve
Apressurereliefsafetyvalveanddischargepipeisfittedto
theboiler. Thisvalve must not betouched. Shouldtherebe
anydischargefrom the pipe, isolatetheboiler electricalsupply
and contact your installation/servicing company.
Cleaning
This appliance contains metal parts and care should be taken
when handling and cleaning with particular regard to edges.
The boiler casing can be cleaned using a mild liquid detergent
with a damp cloth, then a dry cloth to polish.
Do not use any form of abrasive or solvent cleaner as you may
damage the paint work.
Boiler Casing
Donotremoveoradjustthecasinginanyway,asincorrect
fittingmayresultinincorrectoperationorfailuretooperate
atall. Ifindoubtseekadvicefromthelocalgascompanyoryour
installation/servicing company.
Replacement Parts
Ifreplacement parts arerequired apply toyour local supplieror
British Gas.
Please quote the name of the appliance.
Pluming from flue terminal
All condensing boilers produce a plume of water vapour from
the flue terminal. This is due to the high efficiency and hence
low flue gas temperature. This may increase in wet, damp
weather but is nothing to worry about.
Operating the Boiler

5221879A
1.1 Installation
Where no British Standards exists, materials and equipment
should be fit for their purpose and of suitable quality and
workmanship.
Wheninstallingtheappliance,careshouldbetakentoavoidany
possibility of personal injury when handling sheet metal parts.
Theinstallationofthisboilermustbecarriedoutbyacompetent
person in accordance the rules in force in the countries of
destination.
Manufacturer’s instructions must not be taken as overriding
statutory requirements.
1.2 Gas Supply
This boiler is for use only on G20 natural gas.
The gas installation must be in accordance with the current
issue of BS6891.
The supply from the governed meter must be of adequate size
toprovideasteadyinletworkingpressureof20mbar(8in wg) at
the boiler.
Oncompletion,test thegasinstallationforsoundness usingthe
pressuredropmethodandsuitableleakdetectionfluid,purgein
accordance with the above standard.
1.3 Data Label
The data label is on the base panel inside the appliance.
1.4 Electrical Supply
The boiler must be earthed.
All system components shall be of an approved type and all
wiring to current I.E.E. wiring regulations.
The boiler must be connected to a permanent 230V ac, 50Hz
supply.
Connectionofthewholeelectricalsystemoftheboiler,including
any heating controls, to the electrical supply must be through
one common isolator.
Isolation should be by a double pole switched fused spur box,
withaminimum gap of 3mmforbothpoles. The fused spurbox
should be readily accessible and preferably adjacent to the
appliance. It should be identified as to its use.
1 Installation Instructions
Diagram 1.1
Alternatively connection can be made through an unswitched
shuttered socket and 3A fused 3 pin plug.
The mains supply cable and other cables connected to the
boiler must be the PVC flexible type of at least 0.75mm2(24/
0.20mm).
The colours of three core flexible cable are, blue - neutral,
brown - live, green and yellow - earth.
The wire coloured blue must be connected to the terminal
marked “N” or “Black”.
The wire coloured brown must be connected to the terminal
marked “L” or “Red”.
The wire coloured green and yellow must be connected to the
terminal marked “E” or “Green” or the earth symbol .
1.5 Condensate Drain
A plastic drain pipe must be fitted to allow discharge of
condensate to a drain.
Condensate should, if possible, be discharged into the internal
householddrainingsystem.Ifthisisnotpractical,dischargecan
be made externally into the household drainage system or a
purpose designed soak away, see section 9.4 for more details.
1.6 Boiler Efficiency
The Seasonal Efficiency Domestic Boilers UK (SEDBUK) is:
Ecosy 2 SB28E: 90.2%
ThevalueisusedintheUKGovernment’sStandardAssessment
Procedure (SAP) for energy rating of dwellings. The test data
fromwhichithasbeencalculatedhasbeencertifiedbyGastec.
C
L
BOILER
CONDENSATE
SIPHON
INSIDE WALL
FIXING FACE CAP
Condensate Drain
Connection
101
145
373
208
520
118
33
140 REFER TO THE WALL TEMPLATE
FOR PIPE DIMENSIONS
140
9260
890

6
221879A
1 General Information
Diagram 1.2
9261
SCHEMATIC LAYOUT OF BOILER
■For larger systems use an additional expansion vessel.
●Ball valves are fitted in water and gas connections, plus a drain point on water connections.
Lift Weight 52kg (114lb)
Total Weight (packed) 56kg (123lb)
Total Weight (installed) 60kg (132lb)
●Gas connection Rc1/2(1/2in BSPT)
●Heating and return 22mm compression
Safety valve Preset 3bar (43.5lbf/in2)
Safety valve discharge 15mm copper
Water content (heat exch) 2.7 ltr (0.59 gall)
■Expansion vessel capacity 7 litres (1.54 gallons)
Charge pressure 0.5bar (7.3lbf/in2)
Heating system 0.7bar (10.1lbf/in2)
minimum pressure
■Maximum heating 130 litres
system water (28.6 gallons)
content using at 750C
fitted expansion average system
vessel, pressurised temperature
at 1bar.
Electrical supply 230V~50Hz
Electrical rating 115W fused 3A
IP classification IP40
Internal Fuse rating 1) Type 2AF
2) Type 2AF
3) Type 3AT
TABLE 2
NOMINAL
HEAT
INPUT kW 32.5 11.7
GROSS Btu/h 110,890 39,920
NOMINAL
HEAT
OUTPUT kW 28.6 10.0
Btu/h 97,583 34,120
COND.
HEAT
OUTPUT kW 30.0 11.3
Btu/h 102,360 38,556
BURNER
MANIFOLD
SUCTION
PRESSURE mbar -4.8 -0.5
HOT(APPROX) wg -1.92 -0.2
BURNER
%CO29.2-9.6 9.2-9.6
9.0-9.4 9.0-9.4
TABLE 1 C.H. Max MIN
CASING
DOOR ON
CASING
DOOR OFF
m
3/h
2.9 1.0
ft
3/h 102.4 35.3
APPROX.
GAS RATE

7221879A
*
**
*Increase to 25mm clearance from
combustible material.
2.1 Location
The boiler is not suitable for fitting outdoors.
Any electrical switch or boiler control using mains electricity
must be positioned so that it cannot be touched by a person
using a bath or shower.
The boiler must be mounted on a flat wall which is sufficiently
robust to take its weight, refer to Table 2.
2.2 Clearances
The boiler should be positioned so that at least the minimum
operationalandservicingclearancesareprovided,seediagram
2.1.
Additional clearances may be beneficial around the boiler for
installation and servicing.
For flue installations where external access is not practicable,
consideration should be given for the space required to insert
the flue internally which may necessitate clearance larger than
those specified in diagram 2.1.
Diagram 2.1
9070
55
200
† 600
5
525
200
MINIMUM CLEARANCE FROM
PERMANENT SURFACES
† A removable compartment door can be
placed at least 5mm in front of the appliance.
2 Boiler Position
Dimensions in millimetres

8
221879A
3 Flue Location andVentilation
3.1 Flue Position and Length
There are several flueing options available for the
Ecosy 2 SB 28E, e.g. horizontal, vertical and twin flue.
The standard horizontal flue is fitted onto the top of the boiler
using the flue elbow.
See diagrams 3.1 to 3.3 to determine whether a standard flue
can be used.
Thestandardfluecanbeextendedusing1mlongextensionkits
and90°elbows.Amaximumof3500mmofextensionpipesplus
3x90°bends can be added to the standard horizontal flue
length.
When extension pipes are used the flue system must be
designed to have a continuous fall to the boiler of at least 2.5°
to allow condensate to run back into the boiler and out via the
drain.
3.2 Internal Flue Installation
The flue can be installed from inside the building, when access
to the outside wall face is not practicable.
Diagram 3.2 Diagram 3.3
SIDE FLUE - STANDARD Left SIDE FLUE - STANDARD Right
DISTANCE 'Y' = 307 TO 755mm
WALL THICKNESS 'X' = 75 TO 554mm
6502 6501
REAR FLUE - STANDARD
DISTANCE 'Y' = 393 TO 755mm
"X"
"Y"
6503
"Y"
3.3 Terminal Position
The minimum acceptable siting dimensions for the terminal
fromobstructions,other terminals and ventilationopeningsare
shown in diagram 3.4.
The terminal must be exposed to the external air, allowing free
passage of air across it at all times.
Being a condensing boiler some pluming may occur from the
flue outlet. This should be taken into consideration when
selecting the position for the terminal.
Carports orsimilar extensions ofa roofonly, or a roofand one
wall,requirespecialconsiderationwithrespecttoanyopenings,
doors, vents or windows under the roof. Care is required to
protect the roof if made of plastic sheeting. If the car port
comprisesofaroofandtwoormorewalls,seekadvicefromthe
local gas supply company before installing the boiler.
If the terminal is fitted less than 600mm below plastic guttering
orlessthan450mmbelowpaintedeavesorapaintedgutter,an
aluminium shield 750mm long should be fitted immediately
beneath the guttering or eaves.
Diagram 3.1

9221879A
3.4 Terminal Guard
A terminal guard is required if persons could come into contact
with the terminal or the terminal could be subject to damage.
If a terminal guard is required, it must be positioned to provide
minimum of 50mm clearance from any part of the terminal and
be central over the terminal.
The guard should be similar to that shown in diagram 3.5.
A suitable guard can be obtained from.
Tower Flue Components
Morley Rd.
Tonbridge
Kent
TN9 1RA.
Their Reference CGD K3 BL.
3.5 Timber Frame Buildings
If the boiler is to be installed in a timber frame building it should
be fitted in accordance with the Institute of Gas Engineers
documentIGE/UP/7/1998. Ifindoubtseekadvicefromthelocal
gas undertaking or Hepworth Heating Ltd.
3.6 Room Ventilation
The boiler is room sealed, so when it is installed in a room or
space, a permanent air vent is not required.
3.7 Cupboard or Compartment Ventilation
Duetothehighefficiencyandhencelowcasingtemperatureof
thisboiler,cupboardorcompartmentventilationisnotnecessary.
3 Flue Location andVentilation
A
A
FGEA
G
G
G
B,C B,C
FF
K
K
K
C
G
LL
UNDER CAR PORT etc.
H,I
JD
F
K
2816
Diagram 3.4
MINIMUM SITING DIMENSIONS FOR
FANNED FLUE TERMINALS
POSITION
MM
ADIRECTLY BELOW, ABOVE OR
HORIZONTALLY TO AN OPENING, AIR
BRICK, OPENING WINDOWS, AIR VENT
OR ANY OTHER VENTILATION OPENING 300
B BELOW GUTTER, DRAIN/SOIL PIPE 75
C BELOW EAVES 200
D BELOW A BALCONY OR CAR PORT 200
E FROM VERTICAL DRAIN PIPES AND
SOIL PIPES 75
F FROM INTERNAL CORNERS 300*
G ABOVE ADJACENT GROUND OR
BALCONY LEVEL 300
H FROM SURFACE FACING THE
TERMINAL 600*
I FACING TERMINALS 1200
J FROM OPENING (DOOR/WINDOW)
IN CAR PORT INTO DWELLING 1200
K VERTICAL FROM A TERMINAL 1500
L HORIZONTALLY FROM A TERMINAL 300
M FROM EXTERNAL CORNERS 300
M
Diagram 3.5
TERMINAL GUARD
*It may be necessary to increase this dimension to prevent
staining of adjacent walls depending on weather conditions.

10
221879A
4.1 General
The boiler is for use only with sealed central heating systems.
Thesafetyvalveisanintegral part of the boiler anditcannotbe
adjusted.
A pressure gauge is incorporated on the boiler control panel to
indicate the system pressure.
The circulation pump is integral with the boiler.
The Ecosy 2 SB 28E is fitted with a UPS 25-60 pump. A
performance curve is shown in diagram 4.1.
4.2 Expansion Vessel
The boiler has an integral expansion vessel with a capacity of
7 litres (1.54 gallons), with a charge pressure of 0.5bar.
The maximum heating system water content using the fitted
expansion vessel is 130 litres at an average temperature of
75OC, and charge pressure of 1.0bar.
4.3 Flow Rate
The minimum flow rate through the boiler is 1230 litres/hr. This
is equal to 20OC differential at maximum heat input.
The system can be fitted with a lockable balancing valve if
necessary in the main flow or return pipes shown as valve "A"
in diagram 4.2.
Diagram 4.1
9104
4.4 Bypass
Theboilerisfittedwith a manual bypass, seediagram4.3.This
valvemay be adjustedby the installerif necessary toensure at
least1230litres/hrflowthroughtheboiler.Theboilerissupplied
withthebypassopen byapproximatelyhalfaturnandisclosed
by turning the white screw clockwise. However for systems
completelyfittedwiththermostaticradiatorvalvesorsystemsof
high pressure loss an additional bypass valve must be fitted to
the heating circuit to ensure that under no circumstances does
the flow rate drop below this level.
An additional bypass valve “B” is shown in diagram 4.2.
4.5 Filling Sealed Systems
Provisionforfillingthesystematalowlevelmustbemade.Two
methods of filling are shown in diagram 4.4. There must be no
permanentconnectiontothemainswatersupply,eventhrough
a non-return valve.
4 Heating System

11 221879A
9262
Diagram 4.2
Diagram 4.3
6597
MANUAL
BYPASS
VALVE
4.6 Water Treatment
For optimum performance after installation, the boiler and its
associated central heating system should be flushed in
accordancewithBS7593:1992usingacleansersuchasSentinel
X300 or X400, or Fernox Superfloc.
For long term corrosion protection, after flushing, an inhibitor
suitable for aluminium heat exchangers should be used.
Examples are Sentinel X100 and Fernox Copal.
4.7 Draining Tap
A draining tap must be provided at the lowest points of the
system, which will allow the entire system to be drained.
The flow and return isolation valves are provided with drain
points for boiler heat exchanger drainage, see diagram 7.1.
4 Heating System
BOILER
DRAIN
POINT
'B'
'A'
FLOW CONTROL
VALVE
HEATING
CIRCUIT
RETURN
ADDITIONAL
EXPANSION
VESSEL
(if required) OPTIONAL
BY-PASS
VALVE
OPTIONAL FILLING
ARRANGEMENTS,
SEE DIAGRAM 4.4 C
METHOD 1
METHOD 2
SUPPLY STOP
VALVE
SUPPLY
PIPE
HOSE
UNIONS SERVICING
VALVE
TEMPORARY
HOSE HEATING
SYSTEM
HEATING
SYSTEM
TEMPORARY
HOSE
HOSE
UNIONS SERVICING
VALVE
SUPPLY
PIPE
SUPPLY STOP
VALVE
DOUBLE CHECK
VALVE ASSEMBLY
COMBINED
CHECK VALVE
AND VACUUM
BREAKER
C
C
Diagram 4.4
7266

12
221879A
2.5˚
Inclined
Horizontal
Extended flue length
Standard flue length
Diagram 5.1 Diagram 5.2
9263
6525
WALL
TEMPLATE
WALL PLUG
(2 OFF)
WASHER
(2 OFF)
SCREW
No12 x
50mm
(2 OFF)
WALL PLUG
(2 OFF)
SCREW No12 x 50mm
(2 OFF)
WALL
TEMPLATE
HANGING BRACKET
WALL
MOUNTING JIG
208
Ø 125
900
5 Installation Preparation
5.1 Wall Mounting Pack
The wall mounting pack contains everything required to pre-
plumb the boiler, including the wall mounting jig, hanging
bracket, wall template, screw pack and safety valve discharge
pipe, along with these instructions.
5.2 Wall Template
Remove the wall template from the wall mounting pack and
placeinthedesiredpositiononaflatwall,givingdueconsideration
to boiler clearances, see section 2.2.
The wall template supplied covers both the system boiler and
combination boiler versions of the Ecosy 2. When installing a
system boiler please ignore the domestic cold and hot water
connections.
5.3 Flue Hole Cutting
The standard horizontal flue is designed with an internal fall
of 35mm/metre towards the boiler for disposal of condensate.
Ifthestandardfluelength alone isbeingusedthenthefluehole
ofdiameter105mmcanbecutinthepositionmarkedonthewall
template.
For standard side flues the horizontal flue centre line on the
wall template should be extended to the side wall, and the
vertical centre of the flue hole marked at 208mm from the back
wall.
For installations with external access, a 105mm diameter core
drill can be used.
For installations with internal access only a 125mm diameter
core drill should be used.
Whenusingextensionpipeswiththehorizontalrearflue,a core
drillsizeof125mmshouldbeusedtoallowtheextensionpieces
to slope at 35mm/metre (2.50) towards the boiler.
For extended side flues, the flue hole centre should be
determinedbyextendingthedashedinclinedlineonthetemplate
tothesidewall.Thisdashedline isdrawnat35mm/metre(2.5o)
rise from the boiler. Where this line reaches the side wall, a
horizontallineshouldbe marked. Theverticalcentrelineofthe
flue should then be marked at 208mm from the back wall, see
diagram 5.1.
To allow for the flue passing through the wall at this angle a
125mmholeshouldbedrilledirrespectiveofinternalorexternal
installation.
If necessary remove the wall template whilst drilling the flue
hole.
5.5 Wall Mounting Jig and Hanging Bracket
Fixing
The wall mounting jig supplied is suitable for the system boiler
andcombinationboilerversionsoftheEcosy2.When installing
asystemboilerpleaseremove the domesticcoldandhotwater
isolationvalves,alongwith their securingbracketsandscrews.
Ifpreviouslyremoved,repositionthewalltemplateovertheflue
hole and mark the position of the fixing holes for the jig and the
hanging bracket, see diagram 5.2.
Drillthefourfixingholesusinga7mmdia.drillbitandinsertwall
plugs supplied.
Ifgasand/orwaterpipesaretobeplumbedthroughtherearwall
directlyintothewallmountingjigholes,theholesmustbedrilled
as marked on the wall template prior to fixing of the wall
mounting jig.
Secure the wall mounting jig and hanging bracket using the
screws and washers supplied.
5.6 Pre Plumbing
The wall mounting jig can now be pre-plumbed without the
boiler being mounted if necessary. All water, gas and electric
connections are on the wall mounting jig with the exception of
the condense drain, the position of which is shown on the wall
template for pre plumbing purposes. See sections 8 and 9 for
details of gas, water, condensate and electrical connections.
5.7 Unpacking of Boiler Carton
Cutthe strapsthat secure thecarton and theboiler to itstransit
palletandopenthetopflapsofthecarton.Carefullyremovethe
top packing piece which contains the user control door and
place to one side until required. Remove the carton and edge
packing.Toassistinliftingtheboileritisadvisabletoremovethe
casing door by removing the two securing screws.

13 221879A
6.1 Flue Length
All dimensions are in mm.
Forarearflue,measurethedistancefromtheoutsidewallface
to the boiler mounting wall. Check that the flue length will be
suitable, see diagram 3.1 for a standard flue system.
Forasideflue, measurethedistancefromtheoutsidewall face
to the flue outlet centre line of the boiler. Check that the flue
length will be suitable, see diagram 3.2 for a left hand flue
system or diagram 3.3 for a right hand flue system.
Ifthemeasurementexceedsthoseshownindiagrams 3.1-3.3
then one or more extension pipes are required.
6.2 Rear Flue
Mark the air duct assembly and the flue duct at the lengths
shown in diagram 6.1 then cut to length, cutting square and
removing any burrs.
6.3 Standard Side Flue
Mark the air duct assembly and the flue duct at the lengths
shown in diagram 6.2 then cut to length, cutting square and
removing any burrs.
6.4 Side Flue With Extensions
Measure the distance from the outside wall to the side of the
boiler casing. With the extensions only joined together (i.e.
without standard flue piece fitted) cut the end nearest to the
boiler, to the dimensions shown in diagram 6.3.
6.5 Flue Assembly
The flue assembly is an entirely push fit design.
The rubber seals should be lubricated prior to assembly.
Remove all burrs from cut pipes.
Diagram 6.4 shows the components supplied in the standard
flue kit.
Having cut the air and flue ducts as described in sections 6.1 -
6.4, assemble the flue as follows: the flue can be assembled
externallyand internally byfollowing sections A& C, orentirely
from inside by following sections B & C.
A. External fitting - Fit the rubber sealing collar ‘D’ into the
groove at the outer end of the air pipe ‘B’.
Push the air pipe ‘B’ into the wall until collar ‘D’ is pushed up
against the outside face of the wall.
Ensure that the ‘up’ label on air pipe ‘B’ is at the top, i.e. the tab
protrudingintotheholeattheouterendofthepipeisuppermost.
B. Internal fitting - Fit the rubber sealing collar ‘D’ into the
groove at the outer end of the air pipe ‘B’.
Fit spacer piece ‘E’ over air pipe ‘B’.
Pushtheairpipe‘B’throughthewalluntilcollar‘D’isclearofthe
outside face of the wall.
Pull the air pipe ‘B’ to ensure that collar ‘D’ is pulled up to the
outside wall face.
Ensure spacer piece ‘E’ is pushed into the wall, see diagram
6.1.
C. Fitting Completion - Fit sealing flange ‘F’ over the air pipe
and against the inside wall face.
Frominside fitflue pipe ‘A’into the air pipe ‘B’ensuring that the
groove on the outer end engages in the air pipe tab.
Fitthefluepipespacer‘C’overthefluepipe‘A’ andpushinside
air pipe ‘B’.
Attach any extension pieces necessary.
6 Flue Preparation
Diagram 6.3
SIDE FLUE EXTENSION
6554
YC
L
BOILER
Y - 483 LEFT FLUE DUCT
Y - 417 RIGHT FLUE DUCT
Y - 493 LEFT AIR DUCT
Y - 427 RIGHT AIR DUCT
OUTSIDE
WALL FACE SIDE OF
BOILER
AIR DUCT
FLUE
DUCT
125
DIA.
HOLE
Diagram 6.1
X + 196
( AIR DUCT ASSEMBLY)
X + 271
( FLUE DUCT )
X
OUTSIDE
WALL
FACE
Diagram 6.2
SIDE DUCT -STANDARD FLUE
9292
BOILER
MOUNTING
WALL
6505
REAR FLUE
Y + 297 LEFT FLUE DUCT
Y + 363 RIGHT FLUE DUCT
Y + 222 LEFT AIR DUCT
Y + 288 RIGHT AIR DUCT
C
L
BOILER
Y
OUTSIDE
WALL FACE SIDE OF
BOILER
AIR DUCT
FLUE
DUCT

14
221879A
6.6 Flue Attachment To Boiler
Refertosection7andfixtheboilerinpositionpriortocompleting
the flue installation.
Pulloffthewireclipontheflueadaptorpipeinsidetheboiler,see
diagram6.5.Pushtheflueadaptorpipedownwardsintotheflue
pipe.
Refertodiagram 6.4. Fitrubberdome‘J’ to the base oftheflue
elbow ‘G’ and place securing ring ‘H’ over the elbow to rest
around the bottom flange of the rubber dome.
Fitflueelbow‘G’toairpipe‘B’andflueduct‘A’.Asmallamount
of lubricant can be applied to the rubber seals in the elbow to
facilitate this.
Securetherubberdome‘J’ tothetopoftheboilerwithsecuring
ring ‘H’ and screws provided.
Push the flue adapter pipe up onto the inner duct of the elbow
and secure with wire clip.
Diagram 6.4
6507
Diagram 6.5
6551
GROOVE
TAB
‘A’
‘B’
‘G’
‘H’
‘J’
‘D’ ‘E’
‘F’ SCREW
(4 OFF)
‘C’
LABEL
FLUE
ADAPTOR
PIPE WIRE CLIP
GROOVE
BOILER FLUE
OUTLET PIPE
6 Flue Preparation

15 221879A
Boiler Fixing
Having previously secured the wall mounting jig and hanging
bracket to the wall, lift the boiler into position in the following
manner. To assist in the lifting of the boiler, remove the front
panel.
Lean the top of the boiler slightly to the wall and position just
above the hanging bracket. Allow the boiler to slowly move
downwards until engaged in the hanging bracket.
Slowly swing the base of the boiler to the wall mounting jig
ensuring that the copper tails on the boiler fit into the gas and
water isolation valves on the jig, see diagram 7.1. If necessary
the gas and water isolation valve clamps can be loosened to
ease fitting. Make sure that the isolation valves are secured
with the clamps after making good the connections.
Connect the two electrical connector plugs hanging from the
boilerintothesocketsonthewallmountingjig.Thewhitemains
electrical supply socket on the left hand side of the jig and the
blackauxiliaryelectricalsocketontherighthandsideofthejig.
Pleaserefertocondensateconnectionbefore proceeding,
see section 8.4.
Attach the flue as described in section 6.6.
BOILER
MOUNTING
FRAME
GAS
ISOLATION
VALVE
Diagram 7.1
CENTRAL
HEATING
RETURN
CENTRAL
HEATING
FLOW
9264
DRAIN
POINT GAS
SERVICE
COCK
SLOTS SHOWN IN
CLOSED POSITION
CLAMP
SECURING
SCREW
PRESSURE RELIEF
VALVE PIPE
GAS & WATER ISOLATION VALVES
7 Boiler Fixing
8 Gas,Water, and Condensate Connections
8.1 Gas Connection
The gas supply can be connected from below or through the
wall at the rear of the boiler, the position is shown on the wall
template.
Refer also to section 1.2.
Make the gas supply connection to the gas isolation valve.
Slacken or remove the clamp, as desired, whilst making the
connection. Do not subject the gas isolation valve to heat, see
diagram 7.1.
8.2 Water Connections
Provision is made for the water connections to be made from
below or through an internal wall at the rear of the boiler, the
position is shown on the wall template. Copper tail pieces are
supplied in the wall mounting pack if required.
Flush out the heating system before connecting to the boiler.
Make the connections to the heating system by way of the
isolating valves, see diagram 7.1
Slacken or remove the clamps, as desired, while making the
connections. Do not subject any of the isolating valves to heat.
CENTRAL
HEATING
VALVES
DRAIN
POINT TO
FRONT OF
APPLIANCE

16
221879A
Make sure that the drain points on the isolating valves are
positioningtowardsthefrontoftheboiler,alsothatthedrainand
operating screw heads are accessible.
8.3 Safety Valve Discharge
Thepipefromthesafetyvalvemustnotdischargeabovean
entrance, window or any type of public access area.
A short discharge pipe is supplied loose in the wall mounting
pack. This must be extended, using not less than 15mm o.d.
pipe, to discharge, in a visible position, outside the building,
facing downwards, preferably over a drain.
Thepipemusthaveacontinuousfallandberoutedtoaposition
sothatanydischargeofwater,possiblyboiling,orsteamcannot
create any danger to persons, damage to property or external
electrical components and wiring.
To ease future servicing it is advisable to use a compression
type fitting to extend the discharge pipe.
8.4 Condensate Drain Connection
The condensate drain connection is at the bottom of the boiler,
to the left of the wall mounting jig, see diagram 8.1. 21.5mm
plasticoverflowpipeshouldbeusedtofitintothedrainconnection
onthecondensatesiphonanddischargecondensatetoadrain.
The drain pipe should have a fall of a least 2.5oaway from the
boiler.
Condensateshould,ifpossiblebedischargedintothehousehold
internal drainage system. If this is not practicable, discharge
canbeallowed into the externalhouseholddrainsor a purpose
designed soak away.
It is recommended that any external condensate drain pipe is
insulated and also preferably of 32mm diameter, to prevent
freezing in adverse weather conditions.
Thecondensateisdischargedperiodicallyin‘slugs’bysiphonic
action.
Diagram 8.1
9057
CAP
CONDENSATE
SIPHON
DRAIN
CONNECTION
DRAIN PIPE
8 Gas,Water, and Condensate Connections
9.1 Supply Cable Connection
This appliance must be earthed.
It is essential that the polarity is correct.
To prevent an induced current from switching the central
heating on, when not required, it is important that the heating
system control cables are separated from the other mains
supply cables.
The boiler requires a permanent mains supply through an
isolator, see section 1.4.
Any heating system controls must not interrupt the permanent
mains electrical supply to the boiler.
Unscrewthemainselectricalsupplycoverplate,situatedonthe
left hand side of the wall mounting jig, see diagram 9.1.
Remove the white mains electrical connector socket from the
fittings pack and push on to the bracket on the left hand side of
the wall mounting jig with the socket pins pointing upwards.
Remove the two securing screws and cover from the socket.
Using PVC cable of suitable length and rating as stated in
section 1.4, connect the mains supply cable to the appropriate
terminals of the plug, see diagram 9.2.
Standard colours are, Brown - Live; Blue - Neutral; Green and
Yellow - Earth.
The electrical mains supply cable outer insulation must not be
cut back external to the connector.
Make the earth cable of a greater length so that if the cable is
strained the earth would be the last to become disconnected.
9 Electrical Connections
It is recommended that the condense siphon is prefilled by
pouring 250ml (1/2pt) of water into the boiler flue outlet pipe
prior to commissioning, see diagram 6.4.
It is not necessary to provide air breaks or extra traps in the
dischargepipeasthereisalreadyatrapinsidetheboiler.Fitting
an extra trap may cause the boiler siphon to work incorrectly.
Refer to British Gas publication “Guidance notes for the
Installation of Domestic Condensing Boilers” for advice on the
disposal of the boiler condensate.

17 221879A
9.2 Heating System Controls
Mains electricity must NOT be connected to the black
electrical connector plug.
Allheatingsystemcontrolsmustbelowvoltageorpotential
free.
Under no circumstances must connection be made to the
terminal strip under the boiler with the red/white and blue/
white wires connected to it.
Itisrecommendedthattheboileriscontrolledbyaprogrammer
and room thermostat. Thermostatic radiator valves may be
installed in addition to the room thermostat.
Note: For further information, see The Building Regulations
1991-Conservationoffuelandpower, 1995edition-Appendix
G, table 4b.
Allsystemcontrolsare wired into theblackelectricalconnector
plug situated on the right hand side of the wall mounting jig.
If electrical controls are being used the blue link between
terminalsshouldberemovedasnecessaryasshownindiagram
9.3.
Ifelectricalcontrols are notbeingused,DONOT REMOVE the
redandbluelinksbetweenterminals1and2,and2and3in the
black electrical connector plug.
9.3 Frost Thermostat
This boiler has its own frost protection device to protect the
boiler. Additional frost protection may be required for exposed
pipework. If required, connect a single pole frost thermostat to
the appropriate terminals of the black electrical connector plug
as shown in diagram 9.3.
9.4 Outside Sensor
An outside sensor can be supplied as an optional extra, see
section10.10. Ifrequired,connecttotheredandblackwiretails
which are pre-wired to terminals 4 and 5 of the control module.
9.5 Cable and Connector Securing
After completing all the connections to the wall mounting jig
electrical connectors, secure the cables with the covers, using
the screws previously removed.
Connect the boiler connector, and replace the cover plate over
the white mains connector, see diagram 9.4.
9.6 Electrical Connections - Testing
Carry out preliminary electrical system checks as below:
1. Test insulation resistance to earth of mains cables.
2. Test the earth continuity and short circuit of cables.
3. Test the polarity of the mains.
Diagram 9.2
6531
MAINS ELECTRICAL
SUPPLY SOCKET
EARTH
(L) LIVE
(N) NEUTRAL
Diagram 9.1
MAINS ELECTRICAL
COVER PLATE SECURING
SCREW
6571
BRACKET
Diagram 9.3
9380
FROST THERMOSTAT
EXTERNAL
CONTROLS
RED LINK BLUE LINK
Diagram 9.4
APPLIANCE
PLUG
MAINS IN
SUPPLY PLUG
COVER
PLATE
SCREW
WARNING : Mains electricty must not be connected to
the black auxiliary control plug.
6596
9 Electrical Connections

18
221879A
Please ensure the “Benchmark” logbook is completed and left
with the user.
10.1 Filling the Heating Circuit
Open the two central heating isolating valves, slots in line with
the length of the valve, see diagram 7.1.
Flush, fill and vent the system refering to sections 4.5 and 8.2.
Makesurethattheautomaticairventisoperatingcorrectly,see
diagram10.1,andthattheblackcapislooselyfittedtoallowair
to escape.
Pressurise the system until the pressure gauge reads at least
1.0bar (14.5lbf/in2), see diagram 1.
Check the heating system and boiler for water soundness.
Diagram 10.1
9265
AUTOMATIC
AIR VENT
10.2 Preparation for Lighting
Isolate the boiler from the mains electrical supply.
Testforgassoundnessandpurgeairfromthegassupply.Turn
onthegasisolationvalve,slotinlinewiththelengthofthevalve,
see diagram 7.1.
10.3 Initial Lighting
The lighting procedure of the boiler is fully automated. Check
that all external controls are calling for heat.
Turn on the mains electrical supply. After a short delay the
digital display on the fascia should illuminate, see diagram 1 in
Instructions for Use.
The fan should start and after a few seconds the ignition will
commence.
Iftheburnerfailstolightthefanwillstopandthedisplaywillflash
'0' and then '2*'. This indicates the boiler has failed to light,
which initially may be due to air in the gas supply line.
Press the ‘reset’ button and the boiler will restart, see diagram
1 in Instructions for Use.
Flashing digits indicate a fault. Refer to fault finding if any fault
persists, see section 12.
The boiler will continue firing in central heating mode until the
user controls; ie. time clock or room thermostat are satisfied.
10.4 Gas Pressure
The gas valve is factory set and should need no adjustment. It
should be checked that the supply pressure is 20mb when the
boiler is firing at full rate, measured on the gas valve as shown
in diagram 10.2.
See section 10.7 on how to run the boiler at maximum heat
input.
Note that the burner pressure cannot be measured at the gas
valve as it is altered by the suction of the fan and modulated
according to demand.
10.5 Testing - Heating System
Checkthatallremotecontrolsarecallingforheat. Theboilerwill
fire automatically. Fully open all radiator valves, flow control
valve ‘A’ and additional bypass valve ‘B’ if fitted, see diagram
4.2.
Balancetheradiatorsasrequired and if fitted adjustvalve‘A’to
givetherequiredsystemdifferential. Turnoffallradiatorsthat
can be shut off by the user and adjust the boiler bypass if
necessarytoachievelessthanthemaximumdifferentialallowed
of 20°C across flow and return.
If this is not possible, a separate system bypass must be fitted
and adjusted to achieve less than maximum differential. Refer
to section 4.3 and diagram 4.2.
Allow the system to reach maximum temperature then switch
off the boiler by isolating from the electrical supply.
Drainthe entire systemrapidly whilst hot,using the draintap at
the lowest part of the system. Fill and vent the system as
described previously in section 10.1.
Lockor remove thehandles from controlsvalve ‘A’ andbypass
valve ‘B’ if fitted to prevent unauthorised adjustment.
10.6 User Control Door - Fitting
Take the control door, which was removed from the top of the
boilercartonandfitthethetwobrasslugs.Pushthelugsintothe
slots at the bottom of the fascia to engage, see diagram 10.3.
10.7 User Controls and Options
The Ecosy 2 SB 28E has a multifunctional single digit display
andtwocontrolbuttonslabelled‘mode’and‘reset’,seediagram
1 in Instructions for Use.
The ‘reset’ button is used to restart the boiler after a fault
conditionhasoccurred,ie.ignitionfailure,lowwaterpressureor
high water temperature.
The‘mode’buttonallowstheusertoviewtheoperatingconditions
of the boiler, or if necessary change the central heating
temperaturestoapreferredsetting.Theboilerisfactorypre-set
to supply central heating up to 70°C.
10 Commissioning

19 221879A
Repeated pressing of the 'mode' button gives the display
sequence shown in diagram 10.4.
If a different option is required, repeatedly press the ‘mode’
button until the required symbol is shown, and then press and
hold the ‘mode’ button for two seconds. The decimal point will
flash to confirm selection.
Note:Ifnobuttonsarepressedthedisplayrevertstoshowboiler
temperature after approximately two minutes.
Temperature Display
Theboilernormallyshowstheoperatingtemperatureoftheunit
onthedigitaldisplay.However,becausethedisplayconsistsof
only one digit, temperature is represented in blocks of ten
degrees as follows.
CONTROL
DOOR
DISPLAY TEMPERATURE RANGE (°C)
0Min - 5
16-15
216 - 25
326 - 35
436 - 45
546 - 55
656 - 65
766 - 75
876 - 85
986 - Max
6566
Diagram 10.3
9251
BRASS
LUGS
Thedecimal point after thedigitsignifies that theboilerisfiring.
This information is also supplied on the inside of the control
door.
10 Commissioning
Temperature Options
There are four central heating options to choose from. These
optionsareshownonthedigitaldisplaybyrepeatedpressingof
the‘mode’button. Thesequenceisshownindiagram10.4.The
selected options are indicated by a flashing decimal point.
Onlyonecentralheatingoptioncanbeselectedatanyonetime.
For adaptive control, see section 10.9.
Diagram 10.2
9059
PRESSURE
TEST
POINT
ELECTRICAL
CONNECTIONS
PROTECTIVE
CAP

20
221879A
Control Options
There are two control options available: Normal mode and
Holiday mode, see diagram 10.4.
Normalmodeusesthecentralheating temperaturesselected.
Holiday mode shuts down the central heating. However, frost
protection and pump exercise programme remain active. To
resumenormal operationafter a holidayperiod, select ‘Normal
Mode’, .
Ifanexternalfrostthermostatisfitted‘HolidayMode’shouldnot
be selected during periods of cold weather. Turn the central
heating off at the programmer or reduce the room thermostat
temptoalowsetting.Thiswillallowtheexternalfrostthermostat
to operate the boiler, see section 10.13 for 'frost protection'.
10.8 Servicing Options
There are four options available to the service engineer,which
are not to be used by the user, see diagram 10.4. They are as
follows:
Installation Mode
This allows interrogation of the appliance by an authorised
engineer, via the connection of a P.C.
After using the installation mode, normal operation of the
appliance can be resumed by reselecting
'Normal mode', .
Operating Function
The current function that the boiler is performing is shown by a
number with a flashing decimal point, see table below.
Minimum Input Lock
This function allows the service engineer to lock the appliance
intodeliveringminimumheatinputtoenableaccuratecombustion
analysis.
Maximum Input Lock
This function allows the service engineer to lock the appliance
into delivering maximum heat input to enable accurate
combustion analysis.
See section 11.6 for details of checking combustion.
Both input locks are not permanent and revert to normal
operation after approximately 15 minutes. The boiler can be
manually reverted at any time by pressing the ‘Reset’ button.
The display automatically reverts to show temperature after
approximately two minutes.
10.9 Adaptive Control
Adaptive Control is an advanced control feature that requires
the interaction of a room thermostat. It is used in two out of the
fourcentralheatingoptionsandallowstheboilertooptimisethe
heat output. This enables the boiler to operate at much lower
temperatures and hence be more fuel efficient.
If a room thermostat is not fitted when using these modes the
boiler will revert to standard modulation at the temperatures
given in diagram 10.4.
Whenthe boiler firesfrom cold withthe adaptive controlactive,
it fires at low rate for ten minutes before ramping up to full rate.
Fordetailsofwiringinaroomthermostatrefertosection9.2and
diagram 9.3.
10.10 Outside Sensor
Ifanoutsidesensorisfittedtheboileradjuststheflowtemperature
tocompensateforvariationsinexternaltemperature. Onlytwo
centralheatingoptionsareavailablewhicharedifferenttothose
in diagram 10.4, these are:
The outside sensor optimises the boiler
flow temperature to suit demand. Normal on/off control is
retainedbutaroomthermostatisrequired.Thisisthepreferred
option.
For use in systems with a programmer but no room
thermostat. Sets the boiler flow temperature depending on
external temperature. During “off” periods on the programmer
the flow temperature is reduced by 10OC.
10.11 Operating Sequence
Refer to diagram 10.4 and press the ‘mode’ button until the
Operating function is displayed.
9381
10 Commissioning
DISPLAY ACTION
No demand.
Boiler fan is purging the system.
Ignition phase.
Boiler is suppyling central heating.
Waiting for the fan to run up to speed.
Boiler is off after reaching temperature.
Central heating pump overrun.
Boiler safety shut down.
OPERATING FUNCTION