Daikin EWAT_B Series User Manual Download

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Original instructions

REV

Date

June 2018

Supersedes

Air-cooled refrigeration units with scroll compressors

EWAT_B

Cooling capacity from 76 to 701 kW

50Hz - Refrigerant: R32

Installation, Maintenance and Operation Manual

D-EIMAC01706-18EN

Summary of Contents for EWAT_B Series

Page 1: ...ions REV 00 Date June 2018 Supersedes Air cooled refrigeration units with scroll compressors EWAT_B Cooling capacity from 76 to 701 kW 50Hz Refrigerant R32 Installation Maintenance and Operation Manual D EIMAC01706 18EN ...

Page 2: ...EFRIGERANT USED 30 Factory and Field charged units instructions 30 7 PERIODIC CHECKS AND COMMISSIONING OF PRESSURE EQUIPMENT 31 8 DISMISSION AND DISPOSAL 31 9 DURATION 31 LIST OF FIGURES Fig 1 Lifting instructions 7 Fig 2 Unit levelling 9 Fig 3 Minimum space requirements 10 Fig 4 Multiple Chiller Installation 11 Fig 5 Hydraulic diagram without pump s on board 13 Fig 6 Hydraulic diagram with pump s...

Page 3: ... scroll compressor to rise the refrigerant vapour pressure from evaporation pressure to condensation pressure A condenser where high pressure vapour condensate rejecting heat removed from the chilled water in the atmosphere thanks to an air cooled heat exchanger An expansion valve allowing to reduce the pressure of condensed liquid from condensation pressure to evaporation pressure An evaporator w...

Page 4: ...cation where a release of refrigerant can stagnate e g below ground then the installation shall comply with the requirements for gas detection and ventilation of machinery rooms Additional guidelines for safe use of R32 for equipment located in a machinery room When a machinery room is chosen for the location of the refrigerating equipment it shall be located in accordance with local and national ...

Page 5: ...n in relation to the refrigerant and they shall be located where the refrigerant from the leak will concentrate The positioning of the detector shall be done with due consideration of local airflow patterns accounting for location sources of ventilation and louvers Consideration shall also be given to the possibility of mechanical damage or contamination At least one detector shall be installed in...

Page 6: ...al and collective protection devices must be adopted after having carried out an adequate analysis of the specific risks in the relevant area according to the activities to be carried out Receipt of the unit Inspect the unit immediately after delivery In particular make sure that the machine is intact in all its parts and that there are no deformations due to impacts All components described in th...

Page 7: ...rawing shows only the 6 fans version The lifting mode is the same regardless of the number of fans Unit with 6 lifting points The drawing shows only the 10 fans version The lifting mode is the same regardless of the number of fans Fig 1 Lifting instructions ...

Page 8: ... on the ground a strong concrete base at least 250 mm thickness and wider than the unit must be provided This base must be able to support the weight of the unit The unit must be installed above antivibrating mounts AVM rubber or spring types The unit frame must be perfectly levelled above the AVM Installation such as in the figure 3 must always be avoided In case the AVM are not adjustable spring...

Page 9: ...ce required Vertical air discharge must not be obstructed In case of two chillers installed in free field minimum recommended distance between them is 3600 mm in case of two chillers in a row minimum distance is 1500 mm The pictures below show examples of recommended installations Should the unit be installed without observing the recommended minimum distances from walls and or vertical obstacles ...

Page 10: ...n an over temperature ambient due to the recirculating air from the other two chillers In order to avoid the hot air recirculation due to dominant winds the installation where all chillers are aligned to the dominant wind is preferred see figure below Multiple chiller installed side by side in a compound In case of compounds with walls of the same height of the chillers or higher the installation ...

Page 11: ...ined the noise emission level do not require any special protection device to operate continuously close to the unit without any risk In cases where the installation is subject to compliance with special sound requirements it may be necessary to use additional noise attenuation devices it is necessary to isolate the unit from its base with extreme care correctly applying the anti vibration element...

Page 12: ... winter season unless an ethylene glycol mixture in appropriate percentage is added to the water circuit 11 If case of unit substitution the entire water system must be emptied and cleaned before the new unit is installed Regular tests and proper chemical treatment of water are recommended before starting up the new unit 12 In the event that glycol is added to the water system as anti freeze prote...

Page 13: ...rd opt 78 81 max operating pressure 6 bar Fig 7 Hydraulic scheme with hydronic kit opt 134 137 max operating pressure 6 bar Legend BPHE Plate heat exchanger 5 Pump or pumps in line FS Flow switch 6 Filling group TT Temperature probe 7 Safety valve Pt 6 bar 2 Filter 8 Anti vibration joint 3 Pressure Gauge 9 Electrical resistance 4 Shut off valve ...

Page 14: ...t responsible for damage to or malfunctioning of equipment caused by failure to treat water or by improperly treated water Table 1 Acceptable water quality limits pH 25 C 6 8 8 0 Total Hardness mg CaCO3 l 200 Electrical conductivity S cm 25 C 800 Iron mg Fe l 1 0 Chloride ion mg Cl l 200 Sulphide ion mg S2 l 0 Sulphate ion mg SO2 4 l 200 Ammonium ion mg NH4 l 1 0 Alkalinity mg CaCO3 l 100 Silica m...

Page 15: ...ith ELWT 4 C requires option 08 brine and glycol Ref 2 Operation at ambient temperatures 10 C requires option 99 fan speed modulation or option 42 Speedtroll Ref 3 Units with the Reduced noise configuration can increase the sound level in this area Ref 4 Partial load operation operation at full load may require option 142 High ambient temperature kit ...

Page 16: ...perature ELWT Evaporator leaving water temperature Ref 1 Operation with ELWT 4 C requires option 08 brine and glycol Ref 2 Operation at ambient temperatures 10 C requires option 99 fan speed modulation or option 42 Speedtroll Ref 3 Partial load operation operation at full load may require option 142 High ambient temperature kit ...

Page 17: ...the indicated ambient air temperature 2 Ambient air temperature that exceeds the operating limits of the unit Protection of the water circuit is necessary in the winter season even with the unit not in operation Operating stability and minimum water content in the system For the correct functioning of the machines it is important to guarantee a minimum water content inside the system avoiding an e...

Page 18: ...ying and cleaning of the heat exchanger during the winter season It is the responsibility of the installer and or of local maintenance personnel to ensure that described anti freeze methods are used Make sure that appropriate anti freeze protection is maintained at all times Failing to follow the instructions above could result in unit damage Damage caused by freezing is excluded from the warranty...

Page 19: ...ality of the screws of the washers and nuts used Connect the earth conductor yellow green to the PE ground terminal The equipotential protection conductor earth conductor must have a section according to table 1 of EN 60204 1 Point 5 2 shown below In any case the equipotential protection conductor earth conductor must have a cross section of at least 10 mm2 in accordance with point 8 2 8 of the sa...

Page 20: ...and or unqualified personnel to access the unit It is forbidden to access the electrical components without having opened the unit main switch and switched off the power supply It is forbidden to access the electrical components without using an insulating platform Do not access the electrical components if water and or moisture are present Verify that all operations on the refrigerant circuit and...

Page 21: ...hat the work area is properly ventilated before working on the refrigerant circuit or before welding brazing or soldering work ensure that the leak detection equipment being used is non sparking adequately sealed or intrinsically safe ensure that all maintenance staff have been instructed The following procedure should be followed before working on the refrigerant circuit remove refrigerant specif...

Page 22: ...aintenance activities for critical applications or highly aggressive environment Unit exposed to a highly aggressive environment can face corrosion in a shorter time than ones installed on a standard environment Corrosion causes a rapid rusting of the frame core consequently decreases unit structure life time To avoid that it is necessary to wash periodically the frame surfaces with water and suit...

Page 23: ...itched off and the main switch of the unit open Failure to observe this rule could result in serious personal injury When the unit is turned off but the disconnection switch is in the closed position the unused circuits will still be active The maintenance of the electrical system consists of the application of some general rules as follows 1 the current absorbed by the compressor must be compared...

Page 24: ...Verify the condenser coil fins Remove if necessary X Notes 1 Monthly activities include all the weekly ones 2 The annual or early season activities include all weekly and monthly activities 3 Daily reading of the operating values of the unit allows maintaining high observational standards 4 Check for any dissolved metals 5 Check that the cap and the seal have not been tampered with Check that the ...

Page 25: ...ts for any signs of overheating X Verify operation of compressor and electrical resistance X Measure compressor motor insulation using the Megger X Clean air intake filters of the electrical panel X Verify operation of all ventilation fans in the electrical panel X Refrigeration circuit Check for any refrigerant leakage leak test X Verify refrigerant flow using the liquid sight glass Sight glass f...

Page 26: ...D EIMAC01706 18EN 26 32 Fig 12 Refrigerant circuit diagram P ID single circuit unit Water inlet and outlet are indicative Please refer to the machine dimensional diagrams for exact water connections ...

Page 27: ...D EIMAC01706 18EN 27 32 Fig 13 Refrigerant circuit diagram P ID double circuit unit Water inlet and outlet are indicative Please refer to the machine dimensional diagrams for exact water connections ...

Page 28: ... Solenoid valve optional 14 Thermostatic expansion valve optional 15 Suction valve optional 16 Delivery valve optional 17 Twin pumps optional 18 Tank optional 19 Water side safety valve optional 20 Shut off valve optional PT Pressure transducer TT Temperature sensor PSAH High pressure switch 42 barg PSAL Low pressure switch function to check TZAH Electric motor thermistor Fig 14 Description of lab...

Page 29: ...the inlet of the exchangers Install a flow switch Water circuit filling air bleeding Pump installation rotation check filter cleaning Operation of the controls three way valve bypass valve damper etc Water circuit operation and flow balance Check that all water sensors are correctly fixed in the heat exchange Electrical circuit Yes No N A Power cables connected to the electrical panel Starter and ...

Page 30: ...erant charge 1 2 3 calculate the greenhouse gas emission with the following formula 𝑣𝑎𝑙𝑜𝑟𝑒 𝐺𝑊𝑃 𝑑𝑒𝑙 𝑟𝑒𝑓𝑟𝑖𝑔𝑒𝑟𝑎𝑛𝑡𝑒 𝑐𝑎𝑟𝑖𝑐𝑎 𝑡𝑜𝑡𝑎𝑙𝑒 𝑑𝑒𝑙 𝑟𝑒𝑓𝑟𝑖𝑔𝑒𝑟𝑎𝑛𝑡𝑒 𝑘𝑔 1000 use the GWP value mentioned on the greenhouse gases label This GWP value is based on the 4th IPCC Assessment Report a Contains fluorinated greenhouse gases b Circuit number c Factory charge d Field charge e Refrigerant charge for each circuit accord...

Page 31: ... scope with the national laws implementing the Directive 2012 19 EU RAEE Lead batteries must be collected and sent to specific waste collection centers Avoid the escape of refrigerant gases into the environment by using suitable pressure vessels and tools for transferring the fluids under pressure This operation must be carried out by competent personnel in refrigeration systems and in compliance ...

Page 32: ...contents All data and specifications contained therein may be subject to change without notice Refer to the data communicated at the time of the order Daikin Applied Europe S p A explicitly rejects any liability for any direct or indirect damage in the broadest sense arising from or related to the use and or interpretation of this publication All content is copyrighted by Daikin Applied Europe S p...

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