Daikin MicroTech III DPS Installation And Maintenance Manual

Contents

Daikin MicroTech III DPS Installation And Maintenance Manual Manual pdf 48 page image

OM 1263 • MICROTECH UNIT CONTROLLER 48 wwwOperator’s GuideStart Up Operating StateWhen a unit is commanded to start it will always enter theStartup operating state from the Off operating state. The unitremains in the Startup operating state for an adjustable timeperiod (default 180 seconds) before entering the Recirculatingoperating stateDuring the Start up operating state the fans remain off, theoutdoor air dampers are driven closed, and variable speedsupply air fan’s remain at 0% Cooling and heating aredisabled, except for 100% OA heating start sequences.HeatingThe unit enters the Heating operating state when the controlcalls for heat This is for heat pumps onlyMechanical CoolingThe unit enters the mechanical cooling operating state whencooling is called for by the third-party controllerFigure 14: Cooling State DiagramOff to Prestart Pressure EqualizationThe Compressor Cooling State transitions from OFF to PrestartPressure Equalization when the unit enters the Coolingoperating state becomes activePrestart Pressure Equalization to OffThe Compressor Cooling State transitions from PrestartPressure Equalization to OFF if there is no longer a call forcooling operationPrestart Pressure Equalization toInitializationThe Compressor Cooling State transitions from PrestartPressure Equalization to initialization after thirty seconds.Initialization to NormalThe Compressor Cooling State transitions from Initializationto Normal when the initialization sequence is complete. SeeInitialization state description in the Inverter CompressorCooling State Descriptions section, page 51Initialization to PumpdownThe Compressor Cooling State transitions from Initialization toPumpdown if there is no longer a call for cooling operation