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Daikin EWWH955DZXEA2 [15/32] Evaporator frost protection
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D-EIMWC01405-18EN- 15/32
Application
Mono Compressor
Dual Compressor
Conditioning
3.3 lt/kW
2.5 lt/kW
Process
6.6 lt/kW
5.0 lt/kW
Variable capacity
6.6 lt/kW
5.0 lt/kW
Calculation example for EWWD(H)950DZXE units
Cooling capacity at 100% = 946 kW
Minimum system volume for conditioning: 946 x 3.3= 3122 lt
Minimum system volume for processing: 946 x 6.6= 6243 lt
Minimum system volume at variable capacity: 946 x 6.6= 6243 lt
Note: The calculation formula described above, takes into account several factors such as the compressor stop time and
the admissible temperature difference between the last compressor stop and start. In this regard, the minimum water
content calculated refers to the machine operations in a normal climate control system. If the machine is used for process
activities or if higher operating stability is required, we recommend doubling the calculated water content. In very simple
systems, an inertial accumulation tanks may be necessary on the hydraulic circuit to reach the required minimum water
volume. Adding this component must guarantee correct water mixing and, therefore, we recommend you select a tank that
includes an internal diaphragm for this purpose.
Note: If the evaporator water circuit operates in a variable flow system, the minimum water flow rate must not be less than
50% of the water flow at nominal conditions, and the variation should not be greater than 10% of the nominal flow per
minute.
2.11 Evaporator frost protection
1. If the machine is idle during the winter, drain and rinse the evaporator and chilled water pipes with glycol. Drain and
air vent connections are included on the evaporator for this purpose.
2. We recommend adding glycol in proper proportion to the condenser cooling system. The freezing temperature, of
the water-glycol solution, must be at least 6° C lower than the expected minimum ambient temperature.
3. Insulate pipes especially chilled water ones to avoid condensation.
Damage caused by freezing is not covered by warranty, therefore, Daikin Applied Europe SpA cannot
be held liable.
2.12 Condenser protection and design considerations
If lake, river or ground water is used as the cooling fluid and the water valves have a leak, the condenser and liquid
refrigerant line temperatures could drop under room temperature when the machine is off. This problem occurs when cold
water circulates through the condenser and the unit remains off waiting load. If this happens:
1. Turn off the condenser water pump when the compressor is off.
2. Check that the liquid line expansion valve is working properly.
2.12.1 Condensation control with evaporative cooling tower
The minimum condenser inlet water temperature should not be less than 20° C at full water tower flow rate.
If the water temperature must be lower, even the water flow must be reduced proportionately.
To modulate the water flow to the condenser, install a three-way by-pass valve. The figure shows how the three-way valve
is applied to cool the condenser. The three-way valve can be activated by a pressure actuator which guarantees proper
condensing pressure in the case where the water temperature entering the condenser is less than 20° C. A three-way
servo-controlled valve or inverter driven circulation pump could be used instead of a valve with pressure actuator. Both of
these devices could be controlled by a 0-10 Vdc analogue signal emitted by the machine electronic controller according to
the condenser inlet water temperature.
Fig. 3 – Condenser control scheme with cooling tower
1
Cooling tower
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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