GENERAL
miniHE --- Installation&Servicing7
INTRODUCTION
miniHEC24 and miniHEC28 arewall mounted,low water
content, balanced flue,condensingcombinationgasboilers.
Centralheating(CH)outputand domestichotwater(DHW)
outputarebothfullymodulating:
--- between10.2(34 936)and24.6*(83 973)kW(btu/h)for
modelminiHEC24;
--- between12.1(41 284)and28.3*(96 488)kW(btu/h)for
modelminiHEC28.
* ouputswithG31 (propane)feedingaresligthlydifferent.
See sectionBoilerDataatpage4fordetailedfigures.
Duetothehighefficiencyoftheboileraplumeofwater
vapourwill format theterminalduringoperation.
Theboilersaresuitableforconnectiontofullypumped,
pressurisedsealedwatersystemsONLY.
Asystembypass isnotrequiredwhenTRV’sarefittedtoall
radiators(see Frame5).Theboilerincorporatesanautomatic
bypass.
Acirculatingpump,pressuregauge,safetyvalveandheating
expansionvesselareprovided.
TheCHflowtemperatureiscontrolled byathermistor.In
DHWmodetheboilermodulatestosustainanominal
adjustablewaterflowtemperatureof55 °C.
Theboilercasingisofwhitepaintedmildsteelwitha
drop--- downcontrolsaccess door.
Theboilertemperaturecontrolislocated behindthecontrol
paneldoor.
Themain heatexchangerismadeofcopper.
Thecondensingheatexchanger(recuperator)andtheDHW
heatexchangerarestainless steel.
Thesystempipeworkmustincludedraincocksinappropriate
places.Pipeworkmaybetakendownwards.
Forupwardspipeworkinstallationanadditionalframe
(optional)mustbeused(see frame18).
OPTIONALEXTRAKITS
ProgrammerKitfitsneatlywithinthecasing.Separatefitting
instructionsareincludedwiththekit.Note.Ifusingan
alternativeprogrammer readFrame25 first.
HorizontalConcentricExtensionDucts
Upto2,7m(8’10”) forall models.
Otheravailablekitsarelistedinframe9.
SAFE HANDLING
Thisboilermayrequire2ormoreoperativestomoveit toits
installationsite,removeitfromitspackagingbaseand during
movementintoitsinstallationlocation.Maneuveringtheboiler
mayincludetheuseofasacktruckandinvolvelifting,
pushingand pulling.
Cautionshould be exercised duringtheseoperations.
Operatives should beknowledgeablein handlingtechniques
whenperformingthesetasksandthefollowingprecautions
should beconsidered:
FGriptheboilerat thebase.
FBephysicallycapable.
FUsePPEasappropriate,e.g.gloves,safetyfootwear.
Duringall maneuversandhandlingactions,everyattempt
should bemadetoensurethefollowingunless unavoidable
and/ortheweightislight.
FKeep backstraight.
FAvoidtwistingat thewaist.
FAvoidupperbody/topheavybending.
FAlwaysgripwiththepalmofthehand.
FUsedesignatedhandholds.
FKeeploadasdosetothebodyaspossible.
FAlwaysuseassistanceifrequired.
DHWOPERATION
With nocall forCHtheboilerfiresonlywhenDHWisdrawn
off.Whenthereisacall forCH,theheatingsystemis supplied
at theselectedtemperatureuntilDHWisdrawnoff.The
outputisthendirected bythedivertervalvetoheat the
secondaryheatexchangerandsupplyamaximumdraw--- off
of:
miniHEC24.10.1(2.2)l/min(gpm) at35 degree rise.
miniHEC28 11.7(2.6)l/min(gpm) at35 degree rise.
ThenominalDHWtemperatureis55 °C,butwaterdrawnoff
whentheboilerhasbeenonforcentralheatingmaybehotter
thanthis,forashortperiodoftime.
GAS SAFETY
CurrentGasSafety(InstallationandUse)
Regulationsor rulesinforce
Theapplianceis suitableonlyforinstallationinGBandIEand
should beinstalledinaccordancewiththerulesinforce.
InGB,theinstallationmustbecarriedoutbyaCORGI
RegisteredInstaller.Itmustbecarriedoutinaccordancewith
therelevantrequirementsofthe:
FGasSafety(InstallationandUse)Regulations
FTheappropriateBuildingRegulationseitherTheBuilding
Regulations,TheBuildingRegulations(Scotland),
BuildingRegulations(NorthernIreland).
FTheWaterFittingsRegulationsorWaterbyelawsin
Scotland.
FTheCurrentI.E.E.WiringRegulations.
Wherenospecificinstructionsaregiven,referenceshould be
madetotherelevantBritishStandardCodeofPractice.
InIE,theinstallationmustbecarriedoutbyaCompetent
Personandinstalledinaccordancewiththecurrenteditionof
I.S.813 ”DomesticGasInstallations”,thecurrentBuilding
Regulationsandreferenceshould bemadetothecurrent
ETCIrulesforelectricalinstallation.
Detailedrecommendationsarecontainedinthefollowing
BritishStandardCodesofPractice:
BS5440:1Flues(forgasappliancesofratedinputnot
exceeding70 kW).
BS5440:2Ventilation(forgasappliancesofratedinput
notexceeding70 kW).
BS.5449 Forcedcirculation hotwatersystems.
BS.5546 Installationofgashotwatersuppliesfor
domesticpurposes(2ndFamilyGases)
BS6700 Design,installationtestingandmaintenanceof
services supplyinghotwaterfordomesticuse.
BS.6798 Installationofgasfiredhotwaterboilersof
ratedinputnotexceeding70 kW.
BS.6891 Lowpressureinstallationpipes.
Health&SafetyDocumentNo.635.
TheElectricityatWorkRegulations,1989.
ThemanufacturersnotesmustNOTbetaken,inanyway,as
overridingstatutoryobligations.
IMPORTANTTheseappliancesareCEcertificatedforsafety
and performance.Itis,therefore,important thatnoexternal
controldevices,e.g.fluedampers,economisersetc., are
directlyconnectedtotheseappliancesunless covered by
