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Daikin EWAD-C, Original Instructions Manual

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Daikin EWAD-C Original Instructions Manual Download Page 11

 

 

  

D-EIMAC01603-18_02EN- 11/27 

There are two types of freecooling control system: 

 

Figure 6 - Freecooling system with 3 Way Valve 

 

EWAD640CF-XS/XL ÷ EWADC11CF-XS/XL - EWAD600CF-XR ÷ EWADC10CF-XR 

 

 

 
 
EEWT = Water entering temperature probe  
ELWT = Water leaving temperature probe 
 
 

Figure 7 - Freecooling system with 2 Way Valve 

EWADC12CF-XS/XL ÷ EWADC16CF-XS/XL - EWADC11CF-XR ÷ EWADC15CF-XR 

 

 

 
 
EEWT = Water entering temperature probe  
ELWT = Water leaving temperature probe 
 
 
 
System change over is controlled by embedded unit controller, depending from operating conditions and unit setpoint. 
Between winter and summer operation the water side pressure drops are  different,  consequently the chiller water 
flow could be different. Evaluate that the minimum and maximum water flow, between summer and winter operation, 
are inside the water flow limits (see product manual). 

Summary of Contents for EWAD-C

Page 1: ...REV 01 Date 04 2021 Supersedes D EIMAC00608 16EU D EIMAC00608 16EN AR Installation Operation and Maintenance Manual Air cooled screw chillers EWAD C EWAD CF Installation Operation and Maintenance Manual D EIMAC00608 16_01EN ...

Page 2: ...9 6 4 Cable requirements 20 6 5 Phase unbalance 20 7 OPERATION 21 7 1 Operator s responsibilities 21 8 MAINTENANCE 21 8 1 Routine maintenance 21 8 2 Unit Maintenance and Cleaning 24 8 3 Inverter Electrolytic Capacitors 24 9 SERVICE AND LIMITED WARRANTY 24 10 IMPORTANT INFORMATION REGARDING THE REFRIGERANT USED 25 10 1 Factory and Field charged units instructions 25 11 PERIODIC CHECKS AND COMMISSIO...

Page 3: ...D EIMAC00608 16_01EN 3 27 Figure 1 Typical refrigerant circuit Water inlet and outlet are indicative Please refer to the machine dimensional diagrams for exact water connections ...

Page 4: ...D EIMAC00608 16_01EN 4 27 Figure 2 Typical refrigerant circuit with heat recovery Water inlet and outlet are indicative Please refer to the machine dimensional diagrams for exact water connections ...

Page 5: ...WAD650C SS SL SR 15 Electronic expansion valve 16 Evaporator 17 Low pressure safety valve 18 ST Suction temperature probe 19 EP Low pressure transducer 20 Suction shut off valve 21 Liquid injection shut off valve 22 Liquid injection mesh filter 23 Liquid injection solenoid valve 24 F13 High pressure switch 25 DT Discharge temperature sensor 26 OP Oil pressure transducer 27 Water inlet connection 2...

Page 6: ...e electrical panel Label Identification 1 Non flammable gas symbol 6 Electrical hazard symbol 2 Gas type 7 Hazardous Voltage warning 3 Unit nameplate data 8 Cable tightening warning 4 Manufacturer s logo 9 Lifting instructions 5 Water circuit filling warning 10 Emergency stop ...

Page 7: ... the machine and pipes can get very hot or cold and cause the risk of scalding 10 never exceed the maximum pressure limit PS of the water circuit of the unit 11 before removing parts on the pressurised water circuits close the section of the piping concerned and drain the fluid gradually to stabilise the pressure at the atmospheric level 12 do not use your hands to check possible refrigerant leaks...

Page 8: ... vapour compression condensation and evaporation according to reverse Carnot cycle The main components are Screw compressor to rise the refrigerant vapour pressure from evaporation pressure to condensation pressure Evaporator where the low pressure liquid reqrigerant evaporates so cooling the water Condenser where high pressure vapour condensate rejecting heat removed from the chilled water in the...

Page 9: ... this area the unit may operate partly Consult performance tables 6 Operation with fan velocity adjustment only below 10 C ambient temperature 7 Operation with fans with Speedtroll only below 10 C ambient temperature 3 3 Operation with Option 187 The following ranges of units can operate with an extended envelope as shown in Fig 5 EWAD C XS EWAD C PS EWAD C XL EWAD C PL ...

Page 10: ...y valve or two single way valves It depends from chiller size Freecooling operation can be enable by QFC switch installed in the control section of the electrical panel Once the Freecooling function is enabled the unit controller manages automatically the operation of the water valves The system controls also the operation of fans maximizing the freecooling effect THE WATER SYSTEM MUST BE FILLED W...

Page 11: ... XS XL EWADC16CF XS XL EWADC11CF XR EWADC15CF XR EEWT Water entering temperature probe ELWT Water leaving temperature probe System change over is controlled by embedded unit controller depending from operating conditions and unit setpoint Between winter and summer operation the water side pressure drops are different consequently the chiller water flow could be different Evaluate that the minimum ...

Page 12: ...d use adeguate protection device Switch off power supply by opening the main switch before servicing the cooling fans and or compressors Failure to observe this rule could result in serious personal injury Do not introduce solid objects into the water pipes while the unit is connected to the system A mechanical filter must be installed on the water pipe connected to the heat exchanger inlet The un...

Page 13: ... the installation area is free of obstacles that could reduce air flow to the condensers coil The unit must be installed on a robust and perfectly level foundation should the unit be installed on balconies or roofs it might be necessary to use weight distribution beams Figure 9 Lifting of the unit For installation on the ground a strong concrete base at least 250 mm thickness and wider than the un...

Page 14: ...rer representative 5 5 Minimum space requirements It is fundamental to respect minimum distances on all units in order to ensure optimum ventilation to the condenser coils When deciding where to position the unit and to ensure a proper air flow the following factors must be taken into consideration avoid any warm air recirculation avoid insufficient air supply to the air cooled condenser Both thes...

Page 15: ...allation where all chillers are aligned to the dominant wind is preferred see figure below 5 7 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 is not recommended Chiller 2 and chiller 3 work with sensible higher temperature due to the enhanced recirculation In this case special precautions must be t...

Page 16: ...e and maintenance 8 A filter or device that can remove particles from the fluid The use of a filter extends the life of the evaporator and pump and helps to keep the water system in a better condition Recommended maximum opening for strainer mesh is 0 87 mm DX S T 1 0 mm BPHE 1 2 mm Flooded 9 Evaporator has an electrical resistance with a thermostat that ensures protection against water freezing a...

Page 17: ...d bypass and valve arrangement is installed to allow flushing of the piping system The bypass can be used during maintenance to isolate the heat exchanger without disrupting flow to other units Dirt scales corrosion debrits and other other material can accumulate inside the heat exchanger and reduce its heat exchanging capacity Pressure drop can increase as well thus reducing water flow Proper wat...

Page 18: ...ed 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 not covered by the warranty 5 12 Installing the flow switch To ensure sufficient water flow through the evaporator it is essential that a flow switch be installed on the water circuit The flow switch can be installed eithe...

Page 19: ...t or where necessary by additional measures contact the manufacturer representative This product complies with EMC standards for industrial environments Therefore it is not intended for use in residential areas e g installations where the product is connected to a low voltage public distribution system Should this product need to be connected to a low voltage public distribution system specific ad...

Page 20: ...nt has to be use in TN S earthing system if your system is different please contact the manufacturer representative 6 4 Cable requirements The cables connected to the circuit breaker must respect the insulation distance in the air and the surface isolation distance between the active conductors and the earth according to IEC 61439 1 table 1 and 2 and to the local national laws The cables connected...

Page 21: ...ing any work on the system the personnel shall assure that all security precautions have been taken Neglecting unit maintenance could degrade all parts of the units coils compressors frames pipes etc with negative effect on performances and functionality There are two different levels of maintenance which can be chosen according to the type of application critical non critical or to the installati...

Page 22: ...of damage leaks etc X Refrigeration circuit Check for any refrigerant leakage X Verify refrigerant flow using the liquid sight glass Sight glass full X Verify filter dryer pressure drop X Verify oil filter pressure drop Note 5 X Analyse compressor vibrations X Analyse compressor oil acidity 7 X Condenser section Clean water rinse condenser coils Note 4 X Verify that fans are well tightened X Verif...

Page 23: ...ng the liquid sight glass Sight glass full X Verify filter dryer pressure drop X Verify oil filter pressure drop Note 5 X Analyse compressor vibrations X Analyse compressor oil acidity 7 X Condenser section Clean water rinse condenser coils Note 4 X Quarterly clean condenser coils E coated only X Verify that fans are well tightened X Verify condenser coil fins Comb if necessary X Check the aspect ...

Page 24: ...ol which allows them to withstand ambient temperatures down to 20 C However they should not be switched on at temperatures lower than 0 C unless the following procedure is executed Open the switchbox only trained technicians should perform this operation Open compressor fuses by pulling the fuse holders or compressor circuit breakers Power on the chiller Keep the chiller powered on for 1 hour at l...

Page 25: ...ical panel 1 Fill in with indelible ink the refrigerant charge label supplied with the product as following instructions Any refrigerant charge for each circuit 1 2 3 added during commissioning the total refrigerant charge 1 2 3 calculate the greenhouse gas emission with the following formula 𝐺𝑊𝑃 𝑡𝑜𝑡𝑎𝑙 𝑐ℎ𝑎𝑟𝑔𝑒 𝑘𝑔 1000 a Contains fluorinated greenhouse gases b Circuit number c Factory charge d Field...

Page 26: ...e of metal plastic and electronic parts All of these components must be disposed of in accordance with local disposal laws and if in 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 transfer...

Page 27: ...se of its content and the products and services presented therein Specification are subject to change without prior 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 ...

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