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8 Manual RS8EN502 © Danfoss 02-2010 AK-CC 550

Control of two compressors

Thetwocompressorsmustbeofthesamesize.Whenthecontrol-

lerdemandsrefrigerationitwillrstcutinthecompressorwith

the shortest operating time. After the time delay the second

compressor will be cut in.

Whenthetemperaturehasdroppedto”themiddleofthedieren-

tial”,thecompressorwiththelongestoperationtimewillbecut

out.

The running compressor will continue until the temperature has

reachedthecutoutvalue.Thenitwillcutout.Whenthetempera-

tureagainreachesthemiddleofthedierential,acompressorwill

again be started.

Ifonecompressorcannotmaintainthetemperaturewithinthe

dierential,thesecondcompressorwillalsobestarted.

Ifoneofthecompressorshasrunonitsownfortwohours,the

compressorswillbechangedoversothatoperationaltimeisbal-

anced.

The two compressors must be of a type that can start up against a

high pressure.

Thecompressors’ssettingsfor”MinOntime”and”MinOtime”

willalwayshavetoppriorityduringnormalregulation.Butifone

oftheoverridefunctionsisactivated,the”MinOntime”willbe

disregarded.

Railheat

Itispossibletopulse-controlthepowertotherailheatinorderto

saveenergy.Pulsecontrolcaneitherbecontrolledaccordingto

day/nightloadordewpoint.

Pulse control according to day and night

VariousONperiodscanbesetfordayandnightoperation.

A period time is set as well as the percentage part of the period in

whichtherailheatisON.

Pulse control according to dew point

InordertousethisfunctionasystemmanagerofthetypeAK-SM

is required which can measure dew point and distribute the cur-

rentdewpointtotheappliancecontrollers.Forthistherailheat’s

ONperiodiscontrolledfromthecurrentdewpoint.

Twodewpointvaluesaresetintheappliancecontrol:

•Onewheretheeectmustbemax.i.e.100%.(o87)

•Onewheretheeectmustbemin.(o86).

Atadewpointwhichisequaltoorlowerthanthevaluein086,

theeectwillbethevalueindicatedino88.

Intheareabetweenthetwodewpointvaluesthecontrollerwill

manage the power to be supplied to the rail heat.

During defrosting

Duringdefrostingtherailheatwillalwaysbe100%ON.

Dew point

Rail heat

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 35 36

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