Kiturami K1-28E - 4. Description of the Boiler; 4.2 Operating Mode

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ۣૐ ۞ইૐ઺Ҵૐ ೠҴ࢑সӏѺ ಿ૕҃৔మ
4.1 General Description
▪ ThisKituramiK1SeriesCombiboilersarefully
automaticgasredwallmountedcondensingcombination
boilers.
Theyareperfectlyroomsealedandfanassisted,andwill
servecentralheatingandprovidedomestichotwater.
▪ Theboilerissettogiveamaximumoutputof:
- 22Emodel,18.7kW
- 28Emodel,23.3kW
- 34Emodel,29.1kW
- 40Emodel,34.9kW
▪ Theboilerissuitableforuseonlyfullypumpedbuilt-infor
heatingsystem.Priorityisgiventodomestichotwater.
4. Description of the Boiler
4.2.2DHWMode
▪ Whenahotwaterfaucetopensinthehomewhereany
places,theboilerowsensordetectsDHWdemand,the
3-WayValvemovestoDHWmodeandthehighefency
pumpruns,whichmakesthehotwaterintheboilerprimary
circuitowthroughtheDHWheatexchanger,making
instanthotwater.
▪ DHWproductionmodeendswhentheDHWowstops.
DuringtheDHWmode,theboilercheckstwotemperature
sensorsbytheDHWandtheCHthermistors.
▪ WhenthereisnofurtherDHWdemand,e.g.thehotwater
faucetstopped,theburnerswitchesOffandthe3-Way
ValveremainsinDHWmodesideduringawaittime,so
thatitcanworkmoreefcientlyandprovidemoreexibility
ifthetapsarecontinuouslyturnedonandoff.
▪ Whenthewaittimehaselapsed,the3-WayValvereturns
totheheatingsideandtheboilerisreadytosupplyheating.
▪ Operating Principle (Central Heating Mode)
4.2 Operating Mode
4.2.1CentralHeatingMode
▪ TooperatetheCHmode,presstheCHbuttononthe
controlpanelandsettingaCHtemperatureset-point
higherthancurrentCHtemperature.
▪ TheCHmodebeginswhentheheatingdemandcomes
frominstalledroomthermostat,forexample,underthe
conditiontheboilerissetin‘Heat’condition.
▪ IftheroomthermostatisnotconnectedtheCHmode
beginsassoonastheboilerissetin‘CallforHeat’
condition.
▪ 3-WayValvemovestoheatingsideandthehighefency
pumpandfanareenergizedstartsup,andafterchecking
thefanspeedsuitableforacorrectburnerignition,the
burnercontrolworkingisenabled.
▪ Iftheboiler’ssupplywatertemperatureislowerthanthe
desiredtemperatureset-point,theboilerigniteright
awayandheatsuptheheatingsystemuntilthedesired
temperatureisreached.
▪ Iftheburnermodulationpointisreached,therisingof
capacityisstoppedandthecontrolpassestothe
modulationmodetoachievetheCHset-point.
▪ Incaseofthewatertemperatureexceedsthetemperature
set-pointinCHmodeorthereisnofurthercallforheat(e.g.
notcomefromroomthermostat),theburnerswitchesOff
andtheanti-fastcyclingtimerisactivated.
▪ Theburnerstartsagainwhenthewatertemperaturefalls
underthetemperatureset-pointinCHmodeandifthe
AFCTisnished.
Exhaust Gas
Air In
CH Return
CH Outlet
Air In