Dometic SmartStart III - Heating; Compressor Staging Time; Run Mode - Cooling; Run Mode - Reverse

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H EATING 
Heatingset‐pointisanadjustableparameterfrom95°F(35°C)to120°F(49°C)inonedegreeincrements,forbothReturn&Supply
control.Toadjusttheheatingsetpoint,simplytouchthePLCscreenandchangetodesirednewsetpoint.Inheatingmodeyouwillnot
beabletoenteranumberoutsideofthisrange.
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C OMPRESSOR S TAGING T IM E 
CompressorstagingtimeisaPLCadjustableparameterfrom10secondsto110secondsin10‐secondincrements.Toadjustthestaging
time,simplytouchthePLCscreenandchangetodesirednewsetpoint.Userwillnotbeabletoentera numberoutsideofthisrange.
OncethePLCinitiatesacoolingcycle,thestagingtimeisthetimeitwilltake(inseconds)forthenextcompressorrelaytoclose.
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RUN MODE – C OOL ING 
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Compressorrotationisactiveduringrunmode.Thecompressorwiththelowestrunninghourswillbeenabledfirstandcompressorwith
thehighestrunninghourswillbedisabledfirst.
Firststag ewillbeenabledandthecompressorwillstartafterCWandSWflowsarestablefor10seconds(default).
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Firststagewillcontinuetorunfor1minutebeforeenablingthenextstage.Ifthelooprequiresdemand,thenthenextstagewillbe
enabled.
R UN M ODE – R EVERSE C YCLE H EA TI NG 
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Compressorrotationisactiveduringrunmode.Thecompressorwiththelowestrunninghourswillbeenabledfirstandcompressorwith
thehighestrunninghourswillbedisabledfirst.
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EnableReverseCycleHeatonlyforthesystem.
Firststag eheatingwillbeenabledandthecompressorwillstartafterCWandSWflowsarestablefor10seconds.
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Firststagewillcontinuetorunfor5minutesbeforeenablingthenextheaterstage.Ifthelooprequiresdemand,thenthenextstagewill
beenabled.
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R UN M ODE – E LECTRIC H EAT I N G(optionalheaterbarrel)
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Heaterrotationisactiveduringrunmode.Theheaterwiththelowestrunninghourswillbeenabledfirstandtheheaterwiththehighest
runninghourswillbedisabledfirst.
EnableElectricHeatonlyforthesystem.
Firststag ewillbeenabledandtheelectricheaterwillstartafterCWflow
isstablefor10seconds.
Firststag ewillcontinuetorunfor5minutesbeforeenablingthenextheaterst age.IfthePIDlooprequiresdemandthenthenex t
stagewillbeenabled.
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OPERATIONAL M ODES 
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PUMP O PE RA TI O N 
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CHILLED WATER P UM P 
Thechilledwaterpumprelayshallcloseifthesystemisinheatmodeorcoolmode.Thepumpwillbeenabled5secondpriortothe
firststagebeingenabled.Pumpwillbeonforcontinuousoperationwhensystemisenabled
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SEA WATER P UM P 
Theseawaterpumpwillhaveaselectableoperatingmodebetweencontinuousoperationorcyclewithcompressoroperation.
Thedefaultconfigurationistocyclewiththedemand.
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Theseawaterpumprelayshallclose5secondsbeforethecompressorstartsinheatingorcoolingmodesandwillopen5seconds
afterthelas tcompressorcycleiscompleted.Ifimmersionheatingisavailableandused,theseawaterpumpwillbedisabled.
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Inamultistage configurationthepumpoutputs
canbedaisychainedatthebackoftheunittosupplypowertothepumps.
Thiswillallowanystagetosu pplypowertothepumpswhenbein gstagedonandoffandasaredundantcontrolforthepumps.
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