Model:SF-138DigitalTemperatureController
FrontPanelOperation
1.Settemperature(compressorstoptemperature)adjustment
Pressbutton,thesettemperatureisflashdisplayed.
Pomodifyandstorethedisplayedvalue.Pressbuttontoexitthe
statusanddisplaythecoldroomtemperature.
Ifnomorebuttonispressedwithin6seconds,thecoldroomtemperaturewillbedisplayed.
(Settemperatureadjustmentrange:parameterE1E2)
2.Pressbuttonforoncetoflashdisplay2L,itwillresumenormaldisplayafter6seconds.
3.RefrigerationLED:Duringrefrigeration,theLEDison;Whenthecoldroomtemp.isconstant,the
LEDisoff;Duringthedelayprocess,theLEDflashes
4Evap.FanLED:Whenthefanwork,theLEDison;whenthefanstopsrunning,theLEDisoff.
5.Pressbuttonforoncetostartorstopthelight.
6.Longpressbuttonandbuttonfor1secondtoswitchtheCelsiusandFahrenheitdegreeforonce.
7.Powerswitch:Longpressbuttonfor3seconds,allthecontroloutputsstopped(thelightisnotaffected),
andwilldisplay---.Pressbuttonfor1secondtostartup,anddisplaythecold-roomtemperature.
8.Parametersetup
Pressbuttonandholdfor6secondstoentertheparametersetupmodewhileE1flashes.
Pressagainbuttontoselectsequentiallyfromtheparameters:E2,E3....A2,A3.
Pressorbutton,thevaluesofparameterwillbedisplayedandcanbemodified.
Ifnomorebuttonispressedwithin6secondswillexitandstorethenewvalues.
ressorbuttontadjustment
~
.
FeaturesofFunction
TemperatureControl/Manual,automaticdefrost/Evap.Fancontrol/ValueStoring/SelfTesting
Specifications
1.Temperaturesensor:NTC(B=3380,10K=25),1pc(cold-room),2meters(Neitherpositivenornegative)
2.Rangeoftemperaturedisplayed:45~120(-49~248);Accuracy:12
3.Rangeofsettemperature:45~45(-49~113);Factorydefault:04(39)
4.Dimension:77(Length)35(Width)30(Depth)mm
Mountingholedimension:71(Length)29(Width)mm
5.Temperatureoftheoperatingenvironment:10~60(14~140)
RelativeHumidity:20%~90%(Non-condensing)
6.Relayoutputcontactcapacity:
Compressor:N.O.20AFan:12VDC/0.18ALight:12VDC/50mA
℃
－℃℃℉±℃（±℉）
－℃℃℉℃℉
××
×
－℃℃℉
9.Thefactorydefaultresumption:pressbuttonandbuttonsimultaneouslyfor6seconds,theindicator
flashdisplay888,allparametersandsettemperaturewillberesumedasfactorydefaultsatthistime.
After6seconds,itwillreturntonormaloperation.
10.Lockparameters
Innormaloperating,pressbuttonandholdfor6secondstolocktheparametersifLOCisdisplayed,
ortounlockifOPisdisplayed.Parameterscanbedisplayedonlyandcannotbemodifiediflocked,
buttheadjustmentofthesettemp.isactive.(ThefactorydefaultisOP)
Parameter
Parameter
FunctionFunction
Setrange
SetrangeDefault
Default
～
Settemp.
Settemp.
～
E1
Lowersetpointlimit
F4
00=Parallelwithcomp.
(Stopwhendefrost)
01=Continuousrunning
(Stopwhendefrost)
02=Parallelwithcomp.
(Startwhendefrost)
03=Continuousrunning
(Startwhendefrost)
Evap.Fanstarting
mode
0160Min
～
0024Hr
～
20Min
4Hr
F1
F2
F3
0010Min
～
03Min
E2
E3
E4
E5
E6
Highersetpointlimit
Temp.hysteresis
Comp.Startdelaytime
Offsetonroomtemp.
OffsetonEvap.Temp.
Max.Defrostduration
Defrostintervaltime
01
F5
113
45℃
℉
75
24℃
℉
-49
-45℃
℉
23
-5℃
℉
02～
18
01～
10℃
℉
05
03℃
℉
－18
～18
－10～
10℃
℉
－18
～18
－10～
10℃
℉
54
12℃
℉
32～113
00～45℃
℉
01
Defrostterminationtemp.
Displayduringdefrost
00=Nomaldisplay
01=Lastvaluebefore
defrost
00
00℃
℉
00
00℃
℉
～
H1.
H2
～
H1
Hightemp.Alarmvalue
H2
H3
Alarmdelaytime
113
45℃
℉
86℉
30℃
-40/℃℉
5
-15℃
℉
Lowtemp.Alarmvalue
00120Min
～
30Min
00=Nomaldisplay
01=Lockingslowly
display
01
01
A1
A2
Cold-roomtemp.
Displaymode
Doorswitchcontrol
00=thereisnot
01=thereis
A3
00=settemp.Adjustable
01=settemp.Canbe
checkedonly,unadjustable
Settemp.Adjustment
mode
00
Functiondetail
1.Temperaturecontrol
(Whenfirsttimepoweron,pressbuttonforoncecancanceldelayandenterautomaticcontrolmode)
Thecompressorstartsoperatingwhencoldroomtemperature(settemperature+hysteresis),andwill
beoffwhencoldroomtemperaturesettemperature.
Toprotectthecompressor,itcanre-startunlessthetimewhenthecompressorstopseverytimeislonger
thanthedelaytime(ParameterE4).
2.Defrostfunction
Afterworkingadefrostintervalwillautomaticenterthedefroststatus.ThedefrostLEDison,the
compressorstops.Afterdefrostduration,willexitdefroststatus,after2minutesdrippingtime,ifthe
cold-roomtemperatureishigherthan(settemp.+TemperaturehysteresisE3),thecompressorstarts.
Whendefrostintervalissetto00,theautomaticdefrostfunctionwillbecancelled.
3.Temperaturedisplay
WhenparameterA1=01,thetemperaturewilldisplayslowly:withthespeedofonedegreeevery30
secondstoreachtheactualtemperature,anddonotaffectthecompressorworkingnormally.
Whenstartedup,andaftertheactualtemperaturereachthesettemperatureforonce,onlyifthecold
roomtemperatureiswithintherangeof(settemp.+parameterE3+1),willdisplaythesettemperature,
otherwisethetemperaturewilldisplayinlowspeed.
4.Displayduringdefrost
WhensettingparameterF4=0,thecoldroomtemperaturewilldisplaynormally.
WhensettingparameterF4=1,theroomtemp.islockedduringdefrost,andthelastvaluebefore
defrostisdisplayed.Whendefrostends,normaldisplaywillberesumedafter20minutesdelayofroom
temp.Display.If(parameterA1=01),thecold-roomtemperaturewilldisplayslowly,thedefrostLED
flashesduringthelockingdelayprocess.
5.Fancontrol
WhenparameterF5=01,theEvap.Fanpoweronandkeepworking.(Stopwhendefrost)
Thecondenserfanworksynchronizedwiththecompressor.
6.Doorswitchcontrol
WhenparameterA2=01,whendetectthedoorisopen,theEvap.Fanstops,thelightison,atthistime,
when(parameterA1=01),willlockthecold-roomtemperaturedisplay;ifthedoorisnotclosedformore
thanoneminute,thebuzzersound,pressrandombuttontocancelthesound;ifthedoorisnotclosed
formorethan10minutes,thelightwillturnoffautomatically;untilthedoorisclosedfor5minutes,
thenthetemperaturewilldisplayinlowspeed.(Doorswitchlineopen-circuited=doorclosestatus;
doorswitchlineshort-circuited=dooropenstatus.)
7.Highlowtemperatureoverlimitalarm
Afterthecompressorturningonandoffnormallyforonce,canenterthealarmstatus.
Whencold-roomtemperatureishigherthanH1parametersetvalue,andpassalarmdelaytime(parameterH3),
willflashanddisplaythecold-roomtemperatureandexitthedefroststatus.Whenthecoldroomtemperature
islowerthanH2parametersetvalue,andpassthealarmdelaytime(parameterH3),willflashanddisplay
thecold-roomtemperature,thebuzzersound,pressrandombuttontocancelthesound.
≥
≤
8.Abnormalworkmode
9.CircuitDiagram:
Errorcode
1H
1L
2H
2L
Instruction
Cold-roomsensorshort-circuitedorhightemp.
Overlimitmorethan120/248（）℃℉
Cold-roomsensoropen-circuitedorlowtemperature
overlimitlessthan45/49（）－℃－℉
Evap.Sensoropen-circuitedorlowtemperature
overlimitlowerthan45/49（）－℃
－℉
Evap.Sensorshort-circuitedorhightemperature
overlimitmorethan120/248（）℃℉
Operation
Afterthecompressorstopsfor
15minutesandthenworkfor30
minutesincycle;
thebuzzersound,pressrandom
buttontocancelthesound.
Defrostwillonlyaffected
bydefrostintervaltime.
NotesforInstallation
Accessoriesforthetemperaturecontroller
1.Sensorleadsmustbekeptseparatelyfrommainvoltagewiresinordertoavoidhighfrequencynoise
induced.Separatethepowersupplyoftheloadsfromthepowersupplyofthecontroller.
2.Wheninstallationtheprobeshallbeplacedwithheadupwardandthewiredownward.Theevaporator
probemustbeinstalledbetweenthefindoftheevaporatorinthearea,whereprobablytheiceisthe
thickest.Donotplacetheevaporatorprobeneartheelectricheater.
3.Incaseoflong-distanceprobeinstallationfromthecontroller,theprobecablemaybeprolongedupto
100mmax.withoutanyre-calibration
4.Thetemperaturecontrollercannotbeinstalledintheareawithwaterdrops.
1.Onetemperaturesensor
2.Oneinstallationstand
3.Fourconnectingwires
7
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1
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2
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3
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