Daikin AGZ 025D Operating & Maintenance Manual

Daikin AGZ 025D Operating & Maintenance Manual Manual pdf 35 page image

OMM 1166-1 AGZ 025D through 190D 35Liquid Line Solenoid ValveThe liquid line solenoid output should be on whenthe circuit state is either Pre-open or Run. Thisoutput should be off at all other times.Hot Gas Bypass SolenoidValveThis output shall be on when circuit state is Runand one compressor on the circuit is running. Theoutput should be off at all other times.Capacity Overrides – Limitsof OperationThe following conditions shall override automaticcapacity control as described. These overrideskeep the circuit from entering a condition in whichit is not designed to run.Low Evaporator PressureIf the Low Evaporator Pressure Hold or LowEvaporator Pressure Unload alarms are triggered,the circuit capacity may be limited or reduced.See the Circuit Events section for details ontriggering, reset, and actions taken.High Condenser PressureIf the High Condenser Pressure Unload alarm istriggered, the circuit capacity may be limited orreduced. See the Circuit Events section for detailson triggering, reset, and actions taken.AlarmsSituations may arise that require some action fromthe chiller or that should be logged for futurereference. Alarms are classified in the followingsections per the Global Chiller Protocol Standardusing the Fault/Problem/Warning scheme.When any Unit Fault Alarm is active, the alarmdigital output should be turned on. If no UnitFault Alarm is active, but any Circuit Fault Alarmis active, the alarm digital output should alternatefive seconds on and five seconds off continuously.All alarms appear in the active alarm list whileactive. All alarms are added to the alarm logwhen triggered and when cleared.Unit Fault AlarmsPVM/GFP FaultTrigger: Power Configuration = Single Point and PVM/GFP Input #1 is open.Action Taken: Rapid stop all circuitsReset: Auto reset when input is closed for at least 5 seconds or if Power Configuration = Multi Point.Evaporator Flow LossTrigger:1: Evaporator Pump State = Run AND Evaporator Flow Digital Input = No Flow for time > Flow Proof SetPoint AND at least one compressor running2: Evaporator Pump State = Start for time greater than Recirc Timeout Set Point and all pumps have beentried and Evaporator Flow Digital Input = No FlowAction Taken: Rapid stop all circuitsReset:This alarm can be cleared at any time manually via the keypad or via the BAS clear alarm command.If active via trigger condition 1:When the alarm occurs due to this trigger, it can auto reset the first two times each day with the thirdoccurrence being manual reset.