Heat Controller SMA 09 - Typical Operational Occurrences

Heat Controller, Inc. OWNER’S MANUAL SMA/SMH
8
Typical Operational Occurrences
Thefollowingeventsmayoccurduringnormaloperation.
1. Protection of the air conditioner.
Compressor protection
•Iftheunitisstoppedandthenimmediatelyrestartedagain,thecompressorwillnotoperateforabout
3 minutes in order to protect the compressor.
Anti-cold air (heat pump models only)
•TheunitisdesignednottoblowcoldairinHEATmode,whentheindoorheatexchangerisinoneof
thefollowingthreesituationsandthesettemperaturehasnotbeenreached.
A)Whenheatinghasjuststarting.
B)Defrostingisoccurring
C)Lowtemperatureheatingisoccurring
Defrosting (Cooling and heating models only)
•Theindoororoutdoorfanstoprunningwhendefrosting(heatpumpmodelsonly).
•Frostmayaccumulateontheoutdoorunitduringheatcyclewhenoutdoortemperatureislowandhu-
midityishigh,resultinginlowerheatingefciencyoftheairconditioner.
•Duringthiscondition,airconditionerwillstoptheheatingoperationandstartdefrostingautomatically.
•Defrosttimemayvaryfrom4to10minutesaccordingtotheoutdoortemperatureandtheamountof
frostbuildupontheoutdoorunit.
2. Mist or steam are being emitted
•Awhitemistmayemitfromtheindoorunitduetoalargetemperaturedifferencebetweenairinletand
airoutletinCOOLmodeinanindoorenvironmentthathasahighrelativehumidity.
•Awhitemistmayemitduetomoisturegeneratedfromthedefrostingprocesswhentheairconditioner
restartsinHEATmodeoperationafterdefrosting.
3. Typical sounds
•Youmayhearalowhissingsoundwhenthecompressorisrunningorhasjuststoppedrunning.This
soundisthesoundoftherefrigerantowingorcomingtoastop.
•Youcanalsohearalow“squeak”soundwhenthecompressorisrunningorhasjuststoppedrunning.
Thisiscausedbyheatexpansionandcoldcontractionoftheplasticpartsintheunitwhenthetempera-
ture is changing.
•Anoisemaybeheardduetolouverrestoringitsoriginalpositionwhenpowerisrstturnedon.
•Asizzlingsoundmaybeheardoccasionallywhentheunitisdefrosting.
4. Dust is blown out from the indoor unit
•Thisisanormalconditionwhentheairconditionerhasnotbeenusedforalongtimeorduringrstuse
oftheunitandanaccumulationofdusthasformedontheunit’soutlet.Cleaningdustoffoftheunit
beforeoperationwillpreventthis.
5. A peculiar smell comes out from the indoor unit
•Thisiscausedbytheindoorunitgivingoffsmellspermeatedfrombuildingmaterial,fromfurniture,or
smoke.Aburningsmellcouldmeanthereissomethingwrongwiththeunit.Powerofftheunitandcall
anauthorizedservicer.
6. Operating mode changes to FAN ONLY mode
•Whentheindoortemperaturereachesthetemperaturesetpointonairconditioner,thecompressorwill
stopautomatically,andtheairconditionermodechangestoFANonlymode.Thecompressorwillstart
againwhentheindoortemperaturerisesabovethesetpointintheCOOLmodeorfallsbelowtheset
pointintheHEATmode(heatpumponlymodels).