Specifications

IM 1049-4 / Page 29 of 36
Troubleshooting
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condition-
ing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pressure
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compat-
iblewithmineraloiloralkylbenzenelubricants.R-410Asys-
tems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.
Recycle/recovery equipment must be designated for R-410A.
R-410A pressure is greater than R-22. Improper equipment can
cause severe injury or death.
WARNING
Note: Because a water source heat pump operates under a
wide range of water and air temperatures, the values
printed below are to be taken as suggested pressure
andtemperatures.)AllDaikinMcQuay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°
Note: 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.