Emerson IC200CX EVO - Units with a Dedicated DHW Heat Exchanger (DWS)

IC200CXEVO
usermanual
32
9.2Unitswithadedicatedheatexchangerfordomestichotwater(DWS)
Theunitinthissetuphastwoheatexchangers:asystemsideone,forairconditioningandheating,
andonededicatedexclusivelytodomesticwaterproduction.
Onthesystemsideheatexchanger,theunitcanproducehotwaterorcoldwatertomeettheheating
andcoolingrequirementsaccordingtotheseasons.
Ontheheatexchangerdedicatedtodomestichotwater,theunitproduceshightemperaturewater
tobesenttoastoragetankoutsidethemachine.Thistankhasbeenselectedandsizedaccordingto
therequirementsofthesystem.
Dependingontheseason,theunitworkswithdifferentmodes:thechangethroughthevarious
operatingmodes(withintheseason)iscarriedoutautomaticallythroughthereadingofthe
temperatureprobesandthesetpoints.Switchingtimesandlogicshavebeendesignedtoensurethe
maximumefficiencyandreliabilityofthesystem.
Thisconfigurationmustbeassociatedwithasuitablysizedboilerinwhichtostorehightemperature
water.Theboilermusthaveawellforinsertionofthedomestichotwaterprobe,placedatthetop,
throughwhichthecontrolleroftheunitmonitorstheneedtoproducedomestichotwater.
Thepriorityisalwaysfordomestichotwaterproduction.Theheatpumpnormallyoperatesonthe
systemtomeetthecomfortrequirementsofthesystem,butwhenthetemperatureofthewater
insidethetankfallsbelowasetthreshold(setpointSetS,chap.6),thecontrolmanagesdomestichot
waterproduction:
•iftheunitisoperatingasheatpumpforheating,the3wayvalvewillbeswitchedandtheset
pointchanged;
•butiftheunitisproducingchilledwaterforairconditioning,thecontrolswitchestheunitto
heatpumpmode,givesitthesetpointfordomestichotwateranddivertsthe3wayvalveto
theappropriateposition.
Oncethetemperatureinsidethedomestichotwatertankhasreachedthesetvalue,theunit
automaticallyreturnstoproducingwaterfortheheatingandairconditioningsystem.