Daikin Enfinity VFC - Troubleshooting; The In And Outs Of R-410 A; Lubrication; Charging

www.DaikinApplied.com 33 EnnityVerticalWaterSourceHeatPumps• IM 930-6
The in and outs of R-410A
R-410Aisanon-ozonedepletingblendoftwo
refrigerants-HFC-125andHFC-32inaftypercent
mixture.R-410Aexhibitshigheroperatingpressureand
refrigerationcapacitythanR-22.R-410Aisintended
foruseinnewairconditioningapplicationsthathave
traditionallybeenusedHCFC-22(R-22).Duetohigher
capacityandpressureofR-410A,itmustnotbeusedin
existingR-22systems.
AlthoughR-410Aisnon-ammableatambient
temperatureandatmosphericpressure,itcanbecome
combustibleunderpressurewhenmixedwithair.
Note: R-410A should not be mixed with air under pres-
sure for leak testing. Pressure mixtures of dry
nitrogen and R-410A can be used for leak testing.
Lubrication
R-410Ashouldbeusedonlywithpolyester(POE)
oil.TheHFCrefrigerantcomponentsinR-410Awill
notbecompatiblewithmineraloiloralkylbenzene
lubricants.R-410Asystemswillbechargedwiththe
OEMrecommendedlubricant,readyforusewithR-410A.
Charging
DuetothezeotropicnatureofR-410A,itshouldbe
chargedasaliquid.Insituationswherevaporisnormally
chargedintoasystem,avalveshouldbeinstalledinthe
charginglinetoashtheliquidtovaporwhilecharging.
Makecertainthattherecycleorrecoveryequipment
usedisdesignedforR-410A.ThepressureofR-410A
refrigerantisapproximately60percentgreaterthan
thatofR-22.Pressuregaugesrequirearangeupto
800PSIGhighsideand250PSIGlowside.Recovery
cylindersrequirea400PSIGrating–donotputR-410A
ina300PSIGratedcylinder.
Note: Because a water source heat pump operates
under a wide range of water and air tempera-
tures, the values printed below are to be taken
as suggested pressure and temperatures.) All
Daikin water source heat pumps are designed for
commercial use. The units are designed for the
cooling mode of operation and fail safe to cooling.
The reversing valve is energized for the heating
mode of operation.
Superheat Head Pressure Water Delta T
8to14degrees 335-355PSIG 10°to14°
AllinformationaboveisbasedonISOstandard13256-1
andtestedattheseconditions.
General Maintenance
1. Normalmaintenanceonallunitsisgenerally
limitedtolterchanges.Unitsareprovidedwith
permanentlylubricatedmotorsandrequirenooiling
eventhoughoilcapsmaybeprovided.
2. Filterchangesarerequiredatregularintervals.The
timeperiodbetweenchangeswilldependupon
theprojectrequirements.Someapplicationssuch
asmotelsproducealotoflintfromcarpetingand
linenchanges,andwillrequiremorefrequentlter
changes.Checkltersat60-dayintervalsforthe
rstyearuntilexperienceisacquired.Iflightcannot
beseenthroughthelterwhenhelduptosunlight
orabrightlight,itshouldbechanged.Amorecritical
standardmaybedesirable.
3. Thecondensatedrainpanshouldbechecked
annuallyandcleanedandushedasrequired.
4. Recordperformancemeasurementsofvolts,amps,
andwatertemperaturedifferences(bothheating
andcooling).Acomparisonofloggeddatawithstart-
upandotherannualdataisusefulasanindicatorof
generalequipmentcondition.
5. Periodiclockoutsalmostalwaysarecausedby
airorwaterproblems.Thelockout(shutdown)of
theunitisanormalprotectiveresult.Checkfor
dirtinthewatersystem,waterowrates,water
temperatures,airowrates(maybeadirtylter),
andairtemperatures.Ifthelockoutoccursinthe
morningfollowingareturnfromnightsetback,
enteringairbelowmachinelimitsmaybethecause.
troubleshooting