Heat Controller SMH 12 - Features and Functions

SMA/SMH OWNER’S MANUAL Heat Controller, Inc.
5
Mode Temp
Ambient Operating Conditions
Fahrenheit Celsius
Cooling
Outdoor 5 to 109.4 -15 to 43
Indoor =62.6 =17
Heating
Outdoor 5 to 75.2 -15 to 24
Indoor =86 =30
Dehumidication
Outdoor 23 to 109.4 -5 to 43
Indoor >17 >62.6
See chart below for operating conditions:
Low Ambient Operation and Crank Case Heater Feature:
Whencoolingisneededyearround,includingwhenoutdoortemperaturesareapttofallbelowfreezing,ourS
Seriesductlessmini-splitsystemswillcontinuetowork,astheycomewithfactoryinstalledlowambientcon-
trols.Thelowambientfeatureworksbyregulatingtheheadpressurebyvaryingtheamountofairowthrough
thecondenser,whichhelpstopreventevaporatorfreezeupsandlowpressureproblemsduetolowambient
outdoortemperatures.Lowambientoperationisagreatfeaturefortemperature/humiditysensitiveenviron-
mentsorapplicationssuchasserver/computerrooms,supermarkets,restaurants,orcoolingtowerfans.
Additionally,acrankcaseheaterisrequiredandfactoryinstalled,asitisneededforusewiththelowambient
controls.Thecrankcaseheaterminimizesliquidrefrigerantmigrationtothecompressorwhenthecompressor
isnotoperatingandhelpstokeepthecompressoroilwarmenoughsothatitremainsuidtopreventslugging.
Crankcaseheatersalsoassisttogreatlyreduceheatlosstoambientair.Together,thelowerambientfeature
combinedwiththefactoryinstalledcrankcaseheater,willnotonlyallowtheairconditionertocoolyearround,
butwillalsopreventcompressorfailureinlowambientconditions.
Manual Operation
Manualoperationcanbeusedtemporarilytoruntheairconditionerwithoutusingtheremotecontroller.Thisfea-
turecanalsobeusedtotesttheunitduringinstallationandtroubleshootingbyanauthorizedservicetechnician.
1 Openandliftthefrontpanelupuntilitstopsand
makesaclickingsound.
2 Bypressingthemanualcontrolbutton,theunit
willbeplacedintoforcedAUTOoperationmode.
3 Closethepanelrmlytoitsoriginalposition.
CAUTION
•Onceyoupushthemanualbutton,theoperationmode
willchangeinthefollowingorder:
•Bypushingthebuttontwice,theunitwillbeplaced
intoforcedCOOLmode,whichcanbeusedfortesting
purposes.
•Bypushingthebuttonathirdtime,theairconditioner
willstopoperatingandturnoff.
•Torestoreuseoftheremotecontrollertocontrolthe
unit,simplybegintooperatetheunitwiththeremote
controller.
AUTO COOL OFF
Features and Functions: