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 77 page image

Air and Water cooled inverter chillers and heat pumpEWAD TZ - EWAD TZ B - EWWD VZAir and Water cooled inverter chillersand heat pumpD-EOMZC00105-17ENOperation Manual77/84In case of water cooled chillers operating at high condenser water temperature, if the Condensing saturatedtemperature exceeds the Maximum condenser saturated temperature, the circuit is only switched off withoutany notification on the screen as this condition is considered acceptable in this range of operation.Symptom Cause SolutionCircuit status is Off.The compressor does not load anymore oreven unload, circuit is stopped.Bell icon is moving on controller’s display.String in the alarm list:CxCmp1 OffCndPressHiString in the alarm log: CxCmp1 OffCndPressHiString in the alarm snapshotCxCmp1 OffCndPressHiOne or more condenser fans do notoperate properly (A/C units).Check if fans protections have beenactivated.Check that the fans can turn freely.Check that there is not any obstacle to thefree ejection of the air blown.Condenser pump may not be operatingcorrectly (W/C units)Check if the pump can run and give therequired water flow.Dirty or partially blocked condenser coil(A/C units).Remove any obstacle;Clean the condenser coil using soft brushand blower.Dirty condenser heat exchanger (W/Cunits)Clean the condenser heat exchanger.Inlet air temperature of the condenser istoo high (A/C units).The air temperature measured at the inletof the condenser may not exceed the limitindicated in the operational range (workingenvelope) of the chiller.Check the location where the unit isinstalled and check that there are no anyshort circuit of the hot-air blown from thefans of the same unit, or even from fans ofnext chillers (Check IOM for properinstallation).Entering water temperature at condenseris too high (W/C units).Check the cooling tower operation andsettings.Check the three way valve operation andsettings.One or more condenserfan turning in wrongdirection (A/C units).Check for correct phases sequence (L1,L2, L3) in the electrical connection of thefans.Excessive charge ofrefrigerant into the unit.Check liquid sub-cooling and suctionsuper-heat to control indirectly the correctcharge of refrigerant.If necessary recover all the refrigerant toweight the entire charge and to control ifthe value is in line with kg indication on unitlabel.Condensing pressure transducer could notoperate properly.Check for proper operation of the highpressure sensor.Wrong unit configuration (W/C units). Check that the unit has been configured forhigh condenser temperature applications.Reset NotesLocal HMINetworkAuto6.6.18 Low Pressure alarmThis alarm is generated in case the evaporating pressure drops below the Low Pressure Unload and the controlis not able to compensate to this condition.Symptom Cause SolutionCircuit status is Off.The compressor does not load anymore oreven unload, circuit is stoppedimmediately.Bell icon is moving on controller’s display.String in the alarm list:CxCmp1 OffEvpPressLoString in the alarm log: CxCmp1 OffEvpPressLoString in the alarm snapshotCxCmp1 OffEvpPressLoTransitory condition like a fan staging (A/Cunits).Wait until the condition is recovered byEXV controlRefrigerant charge is low. Check sight glass on liquid line to see ifthere is flash gas.Measure sub-cooling to see if the charge iscorrect.Protection limit not set to fit customerapplication.Check the evaporator approach and thecorresponding water temperature toevaluate the low pressure hold limit.High Evaporator Approach. Clean the evaporatorCheck the quality of the fluid that flows intoheat exchanger.