Daikin EWAD TZ-B Operation Manual

Also see for EWAD TZ: Installation, operation and maintenance Installation, operation and maintenance manual

Contents

Daikin EWAD TZ-B Operation Manual Manual pdf 78 page image

Air and Water cooled inverter chillers and heat pumpD-EOMZC00105-17ENOperation Manual78/84EWAD TZ - EWAD TZ B -EWWD VZAir and Water cooled inverter chillers andheat pumpCheck the glycol percentage and type(ethilenic or propilenic)Water flow into water heat exchanger is toolow.Increase the water flow.Check that evaporator water pump isoperating correctly providing the requiredwater flow.Evaporating pressure transducer is notworking properly.Check the sensor for proper operation andcalibrate the readings with a gauge.EEXV is not working correctly.It’s not opening enough or it’s moving inthe opposite direction.Check if pump-down can be finished forpressure limit reached;Check expansion valve movements.Check connection to the valve driver on thewiring diagram.Measure the resistance of each winding, ithas to be different from 0 Ohm.Water temperature is low Increase inlet water temperature.Check the low pressure safeties settings.Reset A/C units W/C units NotesLocal HMINetworkAuto6.6.19 Low Pressure Ratio AlarmThis alarm indicates that the ratio between evaporating and condensing pressure is below a limit whichdepends on compressor speed and guarantees the proper lubrication to compressor.Symptom Cause SolutionCircuit status is Off.The circuit is stopped.Bell icon is moving on controller’s display.String in the alarm list:CxCmp1 OffPrRatioLoString in the alarm log: CxCmp1 OffPrRatioLoString in the alarm snapshotCxCmp1 OffPrRatioLoCompressor is not able to develop theminimum compression.Check fan setpoint and settings, it could betoo low (A/C units).Check compressor absorbed current anddischarge superheat. Compressor can bedamaged.Check the correct operation of suction /delivery pressure sensors.Check the internal relief valve didn’topened during previous operation (checkthe unit history).Note:If the difference between delivery andsuction pressure exceed 22bar, theinternal relief valve open and need to bereplaced.Inspect the gate rotors / screw rotor forpossible damages.Check if the cooling tower or three wayvalves are operating correctly and properlyset.Reset NotesLocal HMINetworkAuto6.6.20 Maximum Number of Restart Alarm (A/C units only)This alarm indicates that for three consecutive times after the compressor start the evaporating pressure isunder a minimum limit for too much timeSymptom Cause SolutionCircuit status is Off.The circuit is stopped.Bell icon is moving on controller’s display.String in the alarm list:Cx OffNbrRestartsString in the alarm log: Cx OffNbrRestartsString in the alarm snapshotCx OffNbrRestartsAmbient temperature is too low Check the operating envelope for thismachine.