Daikin VRV Series - White Mist Comes Out of a Unit; The User Interface Display Reads U4 or U5 and Stops; Noise of Air Conditioners; Dust Comes Out of the Unit

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9.5 White mist comes out of a unit
1 Indoorunit
• Whenhumidityishighduringcooling
operationIftheinteriorofanindoorunitis
extremelycontaminated,thetemperature
distributioninsidearoombecomesuneven.
Itisnecessarytocleantheinteriorofthe
indoorunit.Askyourdealerfordetailson
cleaningtheunit.Thisoperationrequiresa
qualiedserviceperson.
• Immediatelyafterthecoolingoperation
stopsandiftheroomtemperatureand
humidityarelow.Thisisbecausewarm
refrigerantgasowsbackintotheindoor
unitandgeneratessteam.
2 Indoorunit,outdoorunit
• Whenthesystemischangedoverto
heatingoperationafterdefrostoperation.
Moisturegeneratedbydefrostbecomes
steamandisexhausted.
9.6 The user interface display reads “U4”
or “U5” and stops, but then restarts
after a few minutes
• Thisisbecausetheuserinterfaceisintercepting
noisefromelectricappliancesotherthantheair
conditioner.Thenoisepreventscommunication
betweentheunits,causingthemtostop.
Operationautomaticallyrestartswhenthenoise
ceases.
9.7 Noise of air conditioners
1 Indoorunit
• A“zeen”soundisheardimmediatelyafter
thepowersupplyisturnedon.
Theelectronicexpansionvalveinsidean
indoorunitstartsworkingandmakesthenoise.
Itsvolumewillreduceinaboutoneminute.
• Acontinuouslow“shah”soundisheard
whenthesystemisincoolingoperationor
atastop.
Whenthedrainpump(optionalaccessories)
isinoperation,thisnoiseisheard.
• Alow“sah”,“choro-choro”soundisheard
whiletheindoorunitisstopped.
Whentheotherindoorunitisinoperation,
thisnoiseisheard.Inordertopreventoiland
refrigerantfromremaininginthesystem,a
smallamountofrefrigerantiskeptowing.
• A“pishi-pishi”squeakingsoundisheardwhen
thesystemstopsafterheatingoperation.
Expansionandcontractionofplasticparts
causedbytemperaturechangemakethis
noise.
2 Indoorunit,outdoorunit
• Acontinuouslowhissingsoundisheard
whenthesystemisincoolingordefrost
operation.
Thisisthesoundofrefrigerantgasowing
throughbothindoorandoutdoorunits.
• Ahissingsoundwhichisheardatthestart
orimmediatelyafterstoppingoperationor
defrostoperation.
Thisisthenoiseofrefrigerantcausedby
owstoporowchange.
3 Outdoorunit
• Whenthetoneofoperatingnoisechanges.
Thisnoiseiscausedbythechangeof
frequency.
9.8 Dust comes out of the unit
• Whentheunitisusedforthersttimeinalongtime.
Thisisbecausedusthasgottenintotheunit.
9.9 The units can give off odours
• Theunitcanabsorbthesmellofrooms,
furniture,cigarettes,etc.,andthenemititagain.
9.10 The outdoor unit fan does not spin
• Thespeedofthefaniscontrolledinorderto
optimiseproductoperation.
9.11 The display shows “ ”
• Thisisthecaseimmediatelyafterthemain
powersupplyswitchisturnedonandmeans
thattheuserinterfaceisinnormalcondition.
Thiscontinuesforoneminute.
9.12 The compressor in the outdoor unit
does not stop after a short heating
operation
• Thisistopreventoilandrefrigerantfrom
remaininginthecompressor.Theunitwillstop
after5to10minutes.
9.13 The inside of an outdoor unit is warm
even when the unit has stopped
• Thisisbecausethecrankcaseheateris
warmingthecompressorsothatthecompressor
canstartsmoothly.
9.14 Does not cool very well
• Programdryoperation.
Programdryoperationisdesignedtolowerthe
roomtemperatureaslittleaspossiblereferto
“6.2 Program dry operation”.
01_EN_3P344160-11V.indd 13 08-Oct-20 9:22:57 AM