Daikin MicroTech III DPS Installation And Maintenance Manual

Contents

Daikin MicroTech III DPS Installation And Maintenance Manual Manual pdf 60 page image

OM 1263 • MICROTECH UNIT CONTROLLER 60 wwwOperator’s GuideHeat Pump Operating StateCompressor Heating Operation StateMachine – Heat Pump Units OnlyThis section applies to heat pump units only When a unit isconfigured for heat pump operation the primary source ofheating is provided by operating the compressors in a heatingmode of operation When this primary heat is unavailable orat is maximum capacity and more heating is required, anyavailable supplemental heating is controlled as describedin that section When this primary heating is enabled thecompressor transitions through the heating states shown inthe following state diagram Control based on discharge airtemperature (DAT) occurs in the Normal Heating stateFigure 15: Heating State DiagramOff to Prestart Pressure EqualizationThe Compressor Heating State transitions from OFF toPrestart Pressure Equalization when the unit enters theMinDAT or Heating operating statePrestart Pressure Equalization to OffThe Compressor Heating State transitions from PrestartPressure Equalization to OFF if there is no longer a call forMinDAT or Heating operationPrestart Pressure Equalization to InitializationThe Compressor Heating State transitions from PrestartPressure Equalization to initialization after ninety seconds.Initialization to NormalThe Compressor Heating State transitions from Initializationto Normal when the initialization sequence is complete. SeeInitialization state description in the “Inverter CompressorHeating State Descriptions” on page 61Initialization to PumpdownThe Compressor Heating State transitions from Initialization toPumpdown if there is no longer a call for MinDAT or HeatingoperationInitialization to Standby for RestartThe Compressor Heating State transitions from Initializationto Standby for Restart if one of the Compressor Protectionfunctions force a transition to Standby for Restart, the invertercompressor or outdoor fan board requests a transition toStandby for Restart or if all compressor operation becomesdisabled for any reasonNormal to PumpdownThe Compressor Heating State transitions from Normal toPumpdown if there is no longer a call for MinDAT or HeatingoperationNormal to Standby for RestartThe Compressor Heating State transitions from Normal toStandby for Restart if one of the Compressor Protectionfunctions force a transition to Standby for Restart, the invertercompressor or outdoor fan board requests a transition toStandby for Restart or if all compressor operation becomesdisabled for any reasonPumpdown to Standby for RestartThe Compressor Heating State transitions from Pumpdownto Standby for Restart if one of the Compressor Protectionfunctions force a transition to Standby for Restart, the invertercompressor or outdoor fan board requests a transition toStandby for Restart or if all compressor operation becomesdisabled for any reasonPumpdown to InitializationThe Compressor Heating State transitions from Pumpdownto initialization if there is a call for cooling MinDAT or HeatingoperationStandby for Restart to OffThe Compressor Heating State transitions from Standby forRestart to OFF after the heating stage timer expires