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Daikin EWWH490DZXEA2 [14/32] Minimum water content in the system
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D-EIMWC01405-18EN- 14/32
2.9 Temperature limits and water flow
EWWD(H) DZ units are designed to operate with an evaporate outlet water temperature between 4°C and +20°C and a
condenser outlet water temperature between 20°C and 50°C. However, the minimum temperature difference between the
evaporator outlet water temperature and the condenser inlet water temperature must not be less than 15° C. Always check
the exact operating point with the selection software. Some simultaneous operating conditions (high evaporator inlet water
temperature and high condenser inlet water temperature) may be inhibited. The maximum permissible water temperature
in the evaporator with the machine off is 50° C. Higher temperatures could cause the safety valves on the evaporator
sleeve to open. Water flow rate in the condenser and evaporator under the rated value indicated in the unit selection point
can cause freezing problems, scale and poor control. Water flow rate in the condenser and evaporator higher than the
rated value indicated in the unit selection point results in an unacceptable pressure drop and excessive erosion of the
pipes and vibrations that can cause breakage.
EWWD(H)-DZ DRY COOLER VERSION
Dry cooler version Model
EWWD320DZXSA1
EWWH230DZXSA1
EWWD340DZXEA1
EWWH245DZXEA1
EWWD440DZXSA1
EWWH320DZXSA1
EWWD470DZXEA1
EWWH345DZXEA1
EWWD610DZXSA2
EWWH430DZXSA2
EWWD640DZXSA2
EWWH455DZXSA2
EWWD670DZXEA2
EWWH470DZXEA2
EWWD680DZXEA2
EWWH490DZXEA2
EWWD880DZXSA2
EWWH640DZXSA2
EWWD950DZXEA2
EWWH685DZXEA2
EWWD(H)-DZ COOLING TOWER VERSION
Cooling tower version Model
EWWD530DZXSA1
EWWH380DZXSA1
EWWD570DZXEA1
EWWH405DZXEA1
EWWD700DZXSA1
EWWH460DZXSA1
EWWD740DZXEA1
EWWH480DZXEA1
EWWDC10DZXSA2
EWWH755DZXSA2
EWWDC11DZXEA2
EWWH810DZXEA2
EWWDC14DZXSA2
EWWH920DZXSA2
EWWDC15DZXEA2
EWWH955DZXEA2
Legend:
ELWT Evaporator outlet water temperature
CLWT Condenser outlet water temperature
2.10 Minimum water content in the system
For correct machine operations and the necessary operating stability, it is important to ensure a minimum water content in
the system. An accumulation tank with suitable volume may be required for this purpose.
The minimum water content must be calculated by considering the following specifications:
Содержание
- Cooling capacity from 320 to 1480 kw 1
- D eimwc01405 18_01en 1
- Ewwd dz 1
- Ewwh dz 1
- Hz refrigerant hfc r134a r1234ze e 1
- Installation maintenance and operating manual 1
- Water cooled oil free centrifugal chillers 1
- Contents 2
- D eimwc01405 18en 2 32 2
- Downloaded from www manualslib com manuals search engine 2
- Figures 2
- Downloaded from www manualslib com manuals search engine 3
- D eimwc01405 18en 4 32 4
- Downloaded from www manualslib com manuals search engine 4
- Fig 2 dual compressor unit component descriptions 4
- Application 6
- General description 6
- Information about r1234ze e 6
- Introduction 6
- Installation safety 7
- Installation 9
- Receiving and handling 9
- Storage 9
- Lifting instructions 11
- Positioning and assembly 11
- Shock absorbers 11
- Anchoring 12
- Water pipes 12
- Water treatment 13
- Minimum water content in the system 14
- Temperature limits and water flow 14
- Condenser protection and design considerations 15
- Evaporator frost protection 15
- Chilled water control sensor 16
- 386 392 17
- 392 387 x 100 17
- Control circuit 17
- Electrical connections 17
- Open the isolation and or shut off valves 17
- Phase imbalance 17
- Safety valve 17
- Operation 19
- Operator s responsibilities 19
- Unit description 19
- Compressor lead lag 20
- High condensing pressure control 20
- Regulation type 20
- Safeties for each cooling compressor 20
- System safeties 20
- Maintenance 21
- Pressure temperature table 22
- Routine maintenance 23
- Cleaning and storage 27
- Seasonal maintenance 27
- Service schedule 27
- Maintenance schedule 28
- All installation work must be completed as required above the plant inspected and unit ready for operations if plant conditions do not allow the unit to operate within the limits set in the catalogue the unit cannot be started if the above conditions cannot be guaranteed the customer is liable for the daikin applied commissioning approval 29
- Checks before first start up 29
- Daikin unit serial no ________________________________________________________________ daikin unit serial no ________________________________________________________________ 29
- Date __________________________________ 29
- Job name _________________________________________________________________________ job name _________________________________________________________________________ 29
- Name _________________________________ 29
- Notes this list must be completed and sent to the local daikin service department at least two 29
- Signature _________________________________ signature _________________________________ 29
- Site engineer 29
- Unit model no s ___________________________________________________________________ unit model no s ___________________________________________________________________ 29
- Warning the unit should never be operated before daikin applied authorised start up failure to observe this warning could cause serious equipment damages and void the warranty 29
- Weeks before the start 29
- Factory and field charged units instructions 30
- Important information on used refrigerant 30
- Demolition and disposal 31
- Duration 31
- Periodic checks and commissioning of pressure vessels 31
- Daikin applied europe s p a 32
- The present publication is drawn up by of information only and does not constitute an offer binding upon daikin applied europe s p a daikin applied europe s p a has compiled the content to the best of their knowledge refer to the data communicated at the time of the order all the data and specifications contained herein are liable to change without notice refer to the data communicated at the time of the order daikin applied europe s p a cannot be held liable for direct or indirect damage in the broadest sense of the term arising from or related to the use and or interpretation of this publication all content is copyrighted by daikin applied europe s p a 32
- Via piani di santa maria 72 00072 ariccia rome italy tel 39 06 93 73 11 fax 39 06 93 74 014 32
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