Hamworthy STRATTON MK3 Series User guide

IMPORTANT NOTE
THESE INSTRUCTIONS MUST BE READ
AND UNDERSTOOD BEFORE INSTALLING,
COMMISSIONING, OPERATING OR
SERVICING EQUIPMENT AND TO BE LEFT
ADJACENT TO THE GAS METER
INSTALLATION, COMMISSIONING AND
SERVICING INSTRUCTIONS
Wall Hung, Condensing, Room Sealed,
Fully Modulating, Pre-Mix,
Gas Fired Boilers for Heating & Domestic
Hot Water Installations
STRATTON MK3 SERIES BOILERS
NATURAL GAS & PROPANE
Models: S3-40, S3-60, S3-70, S3-80, S3-100, S3-120, S3-150

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CONTENTS
1. WARNINGS AND RECOMMENDATIONS...........................................................................5
1.1. Transport and storage................................................................................................................................... 5
1.2. Symbols used in this document .................................................................................................................... 5
1.3.Qualicationofpersonnelforinstallation,adjustment,useandmaintenance .............................................. 5
1.4.Safetyinstructions......................................................................................................................................... 6
1.5. Water characteristics..................................................................................................................................... 8
1.6. Air quality .................................................................................................................................................... 10
2. APPROVALS .......................................................................................................................11
2.1. Compliance with UK Directives ................................................................................................................... 11
2.2.Regulatoryinstallationconditionsforothercountries.................................................................................. 11
2.3. Gas category............................................................................................................................................... 11
2.4. Gas supply pressures ................................................................................................................................. 12
3. TECHNICAL SPECIFICATIONS ........................................................................................14
3.1. Dimensions ................................................................................................................................................. 14
3.2. Boiler components ...................................................................................................................................... 16
3.3. Combustion at 15°C and 1013 mbar........................................................................................................... 19
3.4. Operating conditions ................................................................................................................................... 21
3.5. Electrical connection ................................................................................................................................... 21
4. INSTALLATION ...................................................................................................................22
4.1. Installing the boiler ...................................................................................................................................... 22
4.2.Removing/installingthefrontpanel ........................................................................................................... 24
4.3. Flue connection........................................................................................................................................... 24
4.4. Gas connection ........................................................................................................................................... 34
4.5.Changinggas(G20toG31foronly40to120kWboilers) ......................................................................... 35
4.6. Hydraulic connection................................................................................................................................... 39
4.7. Electrical connection ................................................................................................................................... 41
5. FIRST USE...........................................................................................................................46
5.1.Checksbeforerstuse ............................................................................................................................... 46
5.2. First use ...................................................................................................................................................... 46
6. CHECKS AFTER COMMISSIONING.................................................................................47
6.1. Condensate removal ................................................................................................................................... 47
6.2. Gas supply .................................................................................................................................................. 47
7. MAINTENANCE OPERATIONS.........................................................................................48
7.1. Draining the boiler ....................................................................................................................................... 48
7.2.Annualchecks............................................................................................................................................. 49
8. END OF PRODUCT LIFE ...................................................................................................51

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9. HYDRAULIC DIAGRAMS AND CONFIGURATIONS ......................................................52
9.1. Symbols used in the diagrams .................................................................................................................... 52
9.2.Listofdiagrams........................................................................................................................................... 52
10. SPARE PARTS LIST.........................................................................................................106
11. CUSTOMER REGULATION PARAMETERS TABLE.....................................................116
12. OPTION KITS ....................................................................................................................132
12.1.Boilermountedkits................................................................................................................................... 133
12.2.Externalkits.............................................................................................................................................. 140
13. APPENDIX A......................................................................................................................147
14. INSTALLATION, COMMISSIONING & SERVICE RECORD LOG BOOK ...................148

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1. WARNINGS AND RECOMMENDATIONS
PLEASE READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
MAINTAINING AND USING THE BOILER. IT CONTAINS IMPORTANT
SAFETY INFORMATION.
1.1. Transport and storage
The boiler:
- must be stored vertically on a at surface or in a place where the
temperature is between -20°C and +55°C with a relative humidity between
5% and 95%.
-mustnotbestacked,
- must beprotectedfromhumidity.
1.2. Symbols used in this document
INFORMATION: This symbol draws attention to comments.
IMPORTANT: Not following these instructions may lead to
damagewheninstallingortootherobjects.
WARNING: Not following these instructions may lead
seriousinjuryandpropertydamage.
WARNING: Not following these instructions may lead
electrocution.
1.3. 
Theoperationstoinstall,adjustandmaintaintheboilermustbecarriedout
byqualiedandapprovedprofessionalsinaccordancewithcurrentlocaland
national regulations (UK require Gas Safe Installer, IE require Registered
Gas Installer RGII). These operations requires intervention under voltage,
withthecasingdoors(locatedonthefrontoftheboiler)open.
The basic usage operations must be carried out with the casing doors closed.
This appliance can be used by children 8 years and above Also persons
with reduced physical, sensory or mental capabilities, or lack of
experience and knowledge, provided they have been given supervision
or instruction with the appliance. Cleaning and user maintenance shall
not be made by children without supervision.
IMPORTANT:
The installer must inform the user of the boiler's operation and its
safety devices.
They must also provide them with the user manual after the boiler has
been installed.

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1.4. Safety instructions
CurrentGasSafety(InstallationandUse)Regulationsorrulesinforce.
Theapplianceis suitable onlyforinstallationin GB andIEandshould be
installedinaccordancewiththerulesinforce.
InGB,theinstallationmustbecarriedoutbyasuitablyqualiedGasSafe
registered engineer or in IE by a competent person. It must be carried out in
accordancewiththerelevantrequirementsofthe:
•GasSafety(InstallationandUse)Regulations
•TheappropriateBuildingRegulationseitherTheBuildingRegulations,The
BuildingRegulations(Scotland),BuildingRegulations(NorthernIreland).
• The Water Fittings Regulations or Water byelaws in Scotland.
• The Current I.E.T. Wiring Regulations.
Wherenospecicinstructionsaregiven,referenceshouldbemadetothe
relevantBritishStandardCodeofPractice.
InIE,theinstallationmustbecarriedoutbyaCompetentPersonandinstalled
inaccordancewiththecurrenteditionofI.S.813“DomesticGasInstallations”
or I.S. 820 “Non-Domestic Gas Installations” as appropriate, the current
Building Regulations and reference should be made to the current ETCI
rulesforelectricalinstallation.
TheBoilerboilershavebeentestedandcertiedto;
BSEN15502-1,BSEN15502-2,BSEN15502-2-1,BSEN60335-1,
BSEN60335-2-102,BSEN55014-1andBSEN55014-2forusewithNatural
Gas&Propane.
DetailedrecommendationsarecontainedinthefollowingCodesofPractice:
BSEN 60529 IPX4D using test method: Figure 4 - Test device to verify
protection against spraying and splashing water; second characteristic
numerals3and4(oscillatingtube).
BS.6891Installationoflowpressuregaspipeworkofupto28mm(R1)in
domesticpremises(2ndfamilygas).
BS.5440Inst.andmaintenanceofuesandventilationforgasappliancesof
ratedinputnotexceeding70kWnet(1st,2ndand3rdfamilygases).
Part1Specicationforinstallationofues.
Part2Specicationforinstallationandmaintenanceofventilationforgas
appliances.
BS. 6644 : 2011 Installation of gas red hot water boilers of rated inputs
between70kWand1.8MW(net)(2ndand3rdfamilygases).
BS.6798Installationandmaintenanceofgasredhotwaterboilersofrated
inputnotexceeding70kWnet.
BS.6880Lowtemperaturehotwaterheatingsystemsofoutputgreaterthan
45kW.
Part1Fundamentalanddesignconsiderations.
Part2Selectionofequipment.
Part3Installation,commissioningandmaintenance.
BSEN.12828:2012 Heating Systems in buildings: Design for water based
systems.

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WARNING: Presence of hot surfaces that can cause burns.
BSEN.12831:2017HeatingSystemsinbuildings:Methodforcalculationof
the design heat load.
BSEN.13831 Specication for: Expansion vessels using an internal
diaphragm,forsealedhotwaterheatingsystems.
BSEN.14336:2004 Heating Systems in buildings: Installation and
commissioningofwaterbasedheatingsystems.
IGEM/UP/1Soundnesstestingandpurgingofindustrialandcommercialgas
installation
IGEM/UP/2 Gas installation pipework, boosters and compressors on
industrial and commercial premises.
IGEM/UP/10 Installation of gas appliances in industrial and commercial
premises.
ICOM Water treatment and conditioning of commercial heating systems
guide.
Where reference is made throughout these instructions I.S.813:2002
“DomesticGasInstallations”referenceshouldalsobemadetoI.S.820:2000
“Non-DomesticGasInstallations”asapplicable.
WARNING:
If you smell gas:
• 
electric switches.
• 󰀨
• Ventilate the area.
• Look for the leak and correct it.
WARNING:
If any smoke is released:
• 󰀨
• Ventilate the premises.
• Look for the leak and correct it.
WARNING:
This boiler's earth continuity is provided by link cables (green/yellow)
       
sure that the cables in question are reconnected; you MUST also
reuse the original fastenings.

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1.5. Water characteristics
Thefollowingrulesapplyoncetheboilerisputintoserviceandremainvalid
untiltheendoflifeoftheproduct.
WARNING: It is forbidden to use water containing glycol.
1.5.1. Preparing the water system before putting the boiler into service
ThisiscoveredbyICOM(listedinSafetysection).
Any installation must be thoroughly ushed and cleaned before it can be
lledandused.ICOM’scomprehensiveguidedealswithallaspectsofwater
treatmentforcommercialheatingsystems.
1.5.2. Protecting the unit against scaling
Water naturally contains dissolved calcium ions and carbonates that cause
scaling(calciumcarbonate)toform.Topreventexcessivedeposits,take
precautionswithregardtothewaterusedtolltheunit.
Watermustbeaddedduringthelifeoftheboiler.Thenewwateraddsscaling
tothewatersystem.The amountof llwaterandtheamountofmake-up
wateraddedthroughouttheunit’slifecyclemustnotbemorethanthreetimes
thewatercapacityoftheheatingsystem.Also,thehardnessofthemake-up
watermustbecontrolled.Make-upwater.
Adding a large amount of untreated water always contributes
a signicant amount of scaling. To monitor this and to
detect problems, a system water meter must be installed.
Failuretocomplywiththeseguidelines(suchthatthellwaterplusthemake-
upwaterismorethanthreetimesthewatercapacityoftheheatingsystem)
requiresafullcleaning(toremovesludgeandscaling)tobeperformed.
WATER TREATMENT CENTRAL HEATING
TheStrattonrangeofboilershaveastainlesssteelheatexchanger.
IMPORTANT. use of non-recommended inhibitors may impact boiler
warranty
HamworthyrecommendWaterTreatmentinaccordancewiththeBenchmark
Guidance Notes on Water Treatment in Central Heating Systems.
If water treatment is used Hamworthy recommend only the use of
SCALEMASTER SM-1 PRO, FERNOX, MBI, ADEY MC1 or SENTINEL
X100inhibitorsandassociatedwatertreatmentproducts,whichmustbe
usedinaccordancewiththemanufacturers’instructions.
Notes:
1. It is most important that the correct concentration of the
water treatment products is maintained in accordance with the
manufacturers’instructions.
2. If the boiler is installed in an existing system any unsuitable
additivesMUSTberemovedbythoroughcleansing.BS7593details
the steps necessary to clean a domestic heating system.

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3. In hard water areas, treatment to prevent limescale may be
necessary-theuseofarticiallysoftenedwaterispermittedwhen
llingthesystem,wherethecoldsupplyisttedwithawatersoftening
device.
4. Under no circumstances should the boiler be red before the
systemhasbeenthoroughlyushed.
1.5.3. Protecting steel and stainless steel boilers against corrosion
Corrosion can a󰀨ect the iron components used in boilers and heating
systems, which is directly related to the presence of oxygen in the water
heater'swater.Dissolvedoxygenthatenterstheunitwhenitisbeinglled
forthersttimereactswiththeequipmentmaterialsandquicklydisappears.
Withoutrefreshingtheoxygenthroughsignicantcontributionsofwater,the
unit might not experience any damage whatsoever.
However,itisimportanttofollowthesizingrulesandinstallationguidelines
inordertopreventoxygenfromcontinuouslyowingintotheheatingwater.
Fromtheserules,wehave:
 - Preferably an expansion vessel with a membrane rather
than an open expansion vessel that allows direct passage.
- Internal pressure with the unit of more than 1 bar cold.
-Removeleaky(permeable)componentsthatarelettingoutmoregasthan
asiftheyweresealed.
Iftheguidelinesabovearefollowed,theunit'ssystemwaterhastheproper
characteristics to last a long time: 8.2 < pH < 9.5 with a water concentration
of<0.1mg/l.
Ifthereisachancethatoxygencouldentertheunit,youmusttakeadditional
precautions.Adding an oxygen scavenger (ex. sodium sulphite) is highly
recommended. We recommend directing any water treatment questions to
specialists,whichcanprovide:
-Theappropriatetreatmentbasedonthecharacteristicsoftheunit,
- A monitoring agreement with a guarantee as to the results.
In the case of a unit where the water is in contact with heterogeneous
materials, for example, if there is any copper or aluminium, appropriate
treatmentisrecommendedtoguaranteealonglifetimefortheunit.Inmost
cases,thistreatmentinvolvesaddingchemicalsolutioncorrosioninhibitors
to the installation. We recommend contacting water treatment specialists.
1.5.4. Unit monitoring
If the recommendations listed above (new installation or renovation) have
beenfollowed,theunitmonitoringislimitedto:
- Checking the amount of make-up water (ll water volume + make-up
watervolume<3timestheunitvolume).
-CheckingthepHlevel(stableorslightlyincreasing).
-Checkingthetotalhardness(stableorslightlydecreasing).
We recommend monitoring these parameters two to three times a year. It
shouldbenotedthatthe"make upwaterquantity"parameterisvitalfora
longlifetimefortheunit.

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Ifanyoftheseparametersdeviatesfromtheaboverecommendations,refer
to a water treatment specialist to correct the problem.
1.5.5. Installation of the plate heat exchanger
Iftherecommendationslistedabovecannotbemet,youcansetupaplate
exchangertoseparatetheprimarysystemfromthesecondarysystem,which
protectstheboilerfromundesirablee󰀨ects.
1.5.6. Setting up a ltration system
A ltration system on the back of the boiler is recommended in order to
removesuspendedparticlesfromtheunit(lter,sedimenttrap,etc.).
1.6. Air quality
Forboilerstooperatecorrectly,thecombustionaircomingfromoutsidemust
befreeofdust.Signicantcorrosioncanbecausedbypollutedair(containing
chloridesforexample)byproductsstorednearby(paint,cleaningproducts,
solvents, glue, etc.). Combustion air must be free of halogen (chlorine,
bromine,uorine)andseasalt.

2. APPROVALS
2.1. Compliance with UK Directives
- Satises the essential requirements of the Electrical Equipment (Safety)
Regulations 2016 and is manufactured in accordance with the UK
designated standards.
- Satises the essential requirement of the Electromagnetic Compatibility
Regulations 2016 and is manufactured in accordance with the UK
designated standards.
- Satises the essential requirements of the regulation 2016/426 on gas
appliancesasboughtintoUKlawandamendedandismanufacturedin
accordance with the UK designated standards.
- SatisestheessentialrequirementsoftheDirective92/42/EECone󰀩ciency
requirementsfor newhot-water boilers redwith liquidor gaseous fuels
asamendedbyTheEcodesignforEnergy-RelatedProductsandEnergy
Information(Amendment)(EUExit)Regulations2019andismanufactured
in accordance with the UK designated standards.
2.2. Regulatory installation conditions for other countries
SeeearlierreferencetoGasSafeetc..
Theappliancemustbeinstalledandmaintainedbyaqualiedprofessional,
in accordance with the regulations and current regulatory practices in the
country where the boiler is installed.
2.3. Gas category
Thisboilerhasbeenadjustedinthefactorytoworkwithgroup H (type G20)
natural gas with a supply pressure of 20 mbar.
Seechapter4.4forhowtochangethegas,anduseaqualiedprofessional.
INFORMATION: Any work on a sealed component will lead to loss of the guarantee.
Models Gas category
UK IE
40 to 120 II2H3P II2H3P
150 I2HI2H
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2.4. Gas supply pressures
INFORMATION: The pressures provided below must be taken at the input to the gas
valve.
Natural gas H
G20
Propane gas
G31
Nominal pressure (mbar) 20 37
Minimum pressure (mbar) 17 25
Maximum pressure (mbar) 25 45
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Figure 1 - Dimensional characteristics
3. TECHNICAL SPECIFICATIONS
3.1. Dimensions

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MODELS in kW
40 60 70 80 100 120 150
ABoiler width (mm) 487
BBoiler depth (mm) 577 668
CBoiler height (mm) 764 895
DFixing centers (mm) 408
EDistanceofxingstosideofboiler (mm) 36
FFixingpointcentersabovetopofcasing (mm) 17
GCenterofconnectionstorearofboiler (mm) 108.5
HCenterofsiphonoutlettosidecasing 66.5 65.5
I
Centerofreturnconnectionfromcasingside
(mm) 73.5 74.5
JCenters between ow and return
connections (mm) 190
KCenters between gas inlet and return
connection (mm) 95
LCenterofuefromside (mm) 240
MCenterofuefromrear (mm) 146,5 123
NFlueconnectionsocketheight (mm) 83
Ø O Return connection G 1"1/4
Ø P Gas inlet connection G 1"
Ø Q Flow connection G 1"1/4
Ø R Pressurereliefvalve G1/2"(female)
Ø S Condensate outlet (mm) 24
Ø T Air inlet (mm) 125 150
Ø U Flue duct (mm) 80 100
V Siphon outlet from the bottom of the
casing (mm) 52

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3.2. Boiler components
Figure 2 - Boiler components for 40 to 70 models
viewwithoutNAVISTEMB3100unit
00U07452020-A
1Air pressure switch
2Température sensor
3Ignitiontransformer
4Ionizationandignitionelectrode
5Gas valve
6Fan
7Condensate siphon (supplied
unmounted)
8Water return temperature sensor
9Bleed valve
10 Water outlet temperature sensor
11 Water pressure sensor
12 Waterowmeter
13 EMClter(on55kW)
Note: in order to facilitate viewing, the side covers have been removed, but these cannot be removed

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STRATTON MK3 - Installation, Use and Maintenance
Figure 3 - Boiler components for 80 to 120 models
700U07425540-A
1Air pressure switch
2Temperature sensor
3Ignitiontransformer
4Ignition electrode
5gas valve
6Fan
7Condensate siphon (supplied
unmounted)
8EMClter
9Water return temperature sensor
10 Trap
11 Water outlet temperature sensor
12 Ionizationelectrode
13 Pressuresensor
14 Flowmeter
viewwithoutNAVISTEMB3100unit
Note: in order to facilitate viewing, the side covers have been removed, but these cannot be removed

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1Air pressure switch
2Flue gas temperature probe
3Ignitiontransformer
4Ignition electrode
5Gas valve
6Fan
7Condensate siphon (supplied
unmounted)
8EMClter
9Water return temperature sensor
10 Bleed valve
11 Water outlet temperature sensor
12 Ionizationelectrode
13 Water pressure sensor
14 Waterowmeter
Figure 4 - Boiler components for 150 model
Note: in order to facilitate viewing, the side covers have been removed, but these cannot be removed

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STRATTON MK3 - Installation, Use and Maintenance
3.3. Combustion at 15°C and 1013 mbar
3.3.1. G20 natural gas
MODELS in kW
40 60 70 80 100 120 150
Nominal power Pn (80/60°C) kW 38.8 53.4 67.8 77.8 93.4 116.8 141.1
Nominal power when condensing P
(50/30°C) kW 42.2 58.0 73.6 84.4 101.3 127.8 154.5
Minimum power Pmin (80/60°C) kW 7.8 10.7 13.6 18.7 18.7 23.4 28.2
Rated heat input Qn kW 40.0 55.0 69.9 80.0 96.0 120.0 145.0
Heat release rate upon ignition Qall kW 8.5 16.5 20.0 20.2 20.2 26.4 30.5
Min heat input Qmin kW 8.0 11.0 14.0 19.2 19.2 24.0 29.0
Performance Pn (80/60°C) % 97.2 97.2 97.1 97.4 97.4 97.4 97.4
Performance Pn (50/30°C) % 105.8 105.6 105.5 105.6 105.6 106.6 106.6
Performance 30% (Return 30 °C) % 108.4 108.2 108.3 108.3 108.3 108.3 108.6
 m3/h 4.2 5.8 7.4 8.5 10.2 12.7 15.3
Value range of CO2 (%) at Qmin/
at Qmax
min/max 9.6 / 10 8.8 / 9.2 8.9 / 9.3
min/max 8.8 / 9.2
Exhaust outlet interior diameter mm 80 80 80 100 100 100 100

(80/60°C)
Qn
Qmin g/s 18.6 25.6 32.5 37.2 44.7 55.8 67.5
4.0 7.7 9.3 9.4 9.4 12.3 14.2

(50/30°C)
Qn
Qmin g/s 16.8 23.1 29.3 33.6 40.3 50.3 60.8
3.6 6.9 8.4 8.5 8.5 11.1 12.8
Exhaust temperature
(80/60°C)
Qn
Qmin °C 79.0 75.5 74.5 66.5 72.5 73.5 73.0
66.5 62.5 61.5 56.5 56.5 58.5 59.0
Exhaust temperature
(50/30°C)
Qn
Qmin °C 55 57 54 51 56 54 58
46 41 38 31 31 37 32
Maximum allowable nozzle
pressure (B23P) (80/60°C)
Qn
Qmin Pa 150 170 185 120 165 190 190
40 40 40 40 40 40 40
Maximum allowable nozzle
pressure (B23P) (50/30°C)
Qn
Qmin Pa 126 145 145 153 153 157 170
40 40 40 40 40 40 40
 m3/h 51.3 70.5 89.6 102.5 123.0 153.8 185.8
Max CO at Qn ppm 125 135 125 115 135 155 140
NOx class 6
 B23,B23P,C13,C33

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3.3.2. G31 Propane Gas (for relevant models and destination countries)
MODELS in kW
40 60 70 80 100 120
Nominal power Pn (80/60°C) kW 38.8 53.4 67.8 77.8 93.4 116.8
Nominal power when condensing P
(50/30°C) kW 42.3 58.1 73.7 84.5 101.4 127.9
Minimum power Pmin kW 7.8 10.7 13.6 18.7 18.7 23.4
Rated heat input Qn kW 40.0 55.0 69.9 80.0 96.0 120.0
Heat release rate upon ignition Qall kW 17.0 20.0 21.0 20.2 20.2 31.2
Min heat input Qmin kW 8.0 11.0 14.0 19.2 19.2 24.0
 m3/h 1.64 2.25 2.86 3.27 3.93 4.91
Value range of CO2(%)
at Qmin min/max 10.8 / 11.2 10.2 / 10.6 9.8 /
10.2
at Qmax min/max 10.3 / 10.7 9.8 / 10.2
Exhaust outlet interior diameter mm 80 80 80 100 100 100

Qn
Qall
Qmin
g/s 17.8 24.5 31.2 35.7 42.8 53.5
3.6 4.9 6.2 8.6 8.6 10.7

Qn
Qall
Qmin
g/s 18.9 25.9 32.9 37.7 45.2 57.1
3.8 5.2 6.6 9.0 9.0 11.4
Exhaust temperature (80/60°C)
Qn
Qall
Qmin
°C 76 76 74 67 73 74
62 62 62 56 56 58
Exhaust temperature (50/30°C)
Qn
Qall
Qmin
°C 56.4 57.6 52.8 52.9 53.4 53.0
44.2 39.0 35.5 30.5 31.0 31.0
Maximum allowable nozzle
pressure (B23P) (80/60°C)
Qn
Qall
Qmin
Pa 145 175 175 120 165 190
40 40 40 40 40 40
Maximum allowable nozzle
pressure (B23P) (50/30°C)
Qn
Qall
Qmin
Pa 125 155 155 100 145 170
40 40 40 40 40 40
 m3/h 49.9 68.6 87.1 104.4 125.3 156.6
NOx class 6
 B23,B23P,C13,C33