Daikin DPS Installation And Maintenance Manual

Also see for RFS: Manual Installation and maintenance manual

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Daikin DPS Installation And Maintenance Manual Manual pdf 31 page image

C oolIng: MulTIsTageCompressor StagingThe following table is provided for reference indicating thecompressors that are included in each circuit for all the RTUand SCU compressor configurations.RTU & SCU Compressor/Circuit ConfigurationsTable 14: RTU & SCU Compressor/Circuit ConfigurationsComp Config Circuit #1 Circuit #2 Circuit #3 Circuit #4 Circuit #5 Circuit #6 Circuit #7 Circuit #82/2/2 1 2 NA NA NA NA NA NA2/2/3 1 2 NA NA NA NA NA NA3/2/4(RTU R22/R407& SCU)1 & 3 2 NA NA NA NA NA NA3/2/4(RTU R410A) 1 2 & 4 NA NA NA NA NA NA3/3/3 1 2 3 NA NA NA NA NA4/2/4 1 & 3 2 & 4 NA NA NA NA NA NA4/4/4 1 2 3 4 NA NA NA NA6/2/6 1, 3 & 5 2, 4 & 6 NA NA NA NA NA NA6/6/6 1 2 3 4 5 6 NA NA6/3/6 1 & 3 2 & 4 5 & 6 NA NA NA NA NA8/4/8 1 & 3 2 & 4 5 & 7 6 & 8 NA NA NA NA8/8/8 1 2 3 4 5 6 7 8RTU/SCU-Two Unequal Sized Compressors,Two Circuits, Three Stages (2/2/3)With this configuration there is only one fixed sequence. If bothcircuits are enabled the Maximum Cooling stages is set to 3 Ifcircuit 2 is disabled the maximum cooling stages is set to 1 andcompressor 1 is staged on and off to maintain the temperaturesetpoint If circuit 1 is disabled the maximum cooling stages isset to 2 and compressor 2 is staged on and off to maintain thetemperature setpointIf a circuit is disabled and then becomes re-enabled, nochange occurs until a new stage up or down request occursAt this time the staging is re-aligned to the “normal” conditionfor the new stageNOTE: During this re-alignment, the cooling stage timeguaranteed on and off times must be observed aswell as a minimum of 10 seconds between startingmore than one compressorTable 15: RTU Standard StagingCompressor StagingStagingSequence Stage 1Compressor Stage 2Compressors Stage 3CompressorsStd-1 1 2 1, 2StgdClgCap 33% 67% 100%RPS/SCU-Two Small Comps on Circuit # 1, OneLarge Comp on Circuit # 2, Four Stages (RTUw/3/4/2 R22 or R407C or SCU)With this configuration there are two fixed sequences usedwhen both circuits are enabledIf both circuits are enabled, the staging sequence is Std-1 if compressor # 1 has fewer hours than compressor # 3and the staging sequence is Std-2 if compressor # 1 doesnot have fewer hours than compressor # 3 If Circuit #1 isdisabled compressor # 2 is staged on and off to maintainthe temperature setpoint If Circuit #2 is disabled the stagingsequence is set to Std-1 if comp #1 has fewer hours than comp#3 and the staging sequence is set to Std-2 if comp #1 doesnot have fewer hours than comp #3 If a circuit is disabledand then becomes re-enabled, no change occurs until a newstage up or down request occurs At this time the staging isre-aligned to the “normal” condition for the new stage Whenboth circuits are enabled the staging sequence is changed onlywhen the number of stages is zero or Maximum Cooling stagesNOTE: During this re-alignment, the cooling stage timeguaranteed on and off times must be observed aswell as a minimum of 10 seconds between startingmore than one compressorTable 16: RPS/SCU Standard StagingCompressor StagingStagingSequence Stage 1Compressor Stage 2Compressors Stage 3Compressors Stage 4CompressorsStd-1 1 1, 3 2, 3 1, 2, 3Std-2 3 3, 1 1, 2 1, 2, 3StgdClgCap 25% 50% 75% 100%C oolIng: MulTIsTagewww DaikinApplied com31 IM 919-3 • MICROTECH III CONTROLLER