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Water-cooled screw chillers

EWWD170~600G-SS
EWWD190~650G-XS
EWLD160~550G-SS

50Hz

– Refrigerant: R-134a

Original Instructions

Installation, Operation and Maintenance Manual

–EIMWC00208-16EN

Содержание EWLD160~550G-SS

Страница 1: ...Water cooled screw chillers EWWD170 600G SS EWWD190 650G XS EWLD160 550G SS 50Hz Refrigerant R 134a Original Instructions Installation Operation and Maintenance Manual D EIMWC00208 16EN...

Страница 2: ...ual The entire content is protected by Daikin copyright WARNING Before starting the installation of the unit please read this manual carefully Starting up the unit is absolutely forbidden if all instr...

Страница 3: ...dentification 1 Lifting instructions 6 Non flammable gas symbol 2 Unit nameplate data 7 Manufacturer s logo 3 Hazardous Voltage warning 8 Emergency stop 4 Cable tightening warning 9 Water circuit fill...

Страница 4: ...rical wiring Optional 18 Unit limitation Electrical wiring Optional 19 Operation 20 Operator s responsibilities 20 Description of the machine 20 Description of the refrigeration cycle 20 Description o...

Страница 5: ...nance 10 Fig 3 Water piping connections for evaporator 11 Fig 4 Water piping connection for heat recovery exchangers 11 Fig 5 Adjusting the safety flow switch 12 Fig 6 Condenser Located with No Elevat...

Страница 6: ...o the use and or interpretation of this Installation and Maintenance Manual Safe use and maintenance of the unit as explained in this Maintenance and Use Manual is fundamental to prevent any accidents...

Страница 7: ...ller and the qualified operator to carry out all required operations in order to ensure proper installation and maintenance of the machine without any risk to people animals and or objects This manual...

Страница 8: ...e connected to the heat exchanger inlet The machine is supplied with safety valves that are installed on both the high and the low pressure sides of the refrigerant circuit In case of sudden stop of t...

Страница 9: ...el foundation should the machine be installed on balconies or roofs it might be necessary to use weight distribution beams For installation on the ground prepare a strong cement base that is at least...

Страница 10: ...r system under pressure expansion tank etc 5 Water temperature and pressure indicators on the machine to assist the operator during service and maintenance 6 A filter or device which can remove foreig...

Страница 11: ...reign material can accumulate inside the heat exchanger and reduce its heat exchanging capacity Pressure drops can increase as well thus reducing water flow Proper water treatment therefore reduces th...

Страница 12: ...witch can be installed either on the inlet or outlet water piping The purpose of the flow switch is to stop the machine in the event of interrupted water flow thus protecting the evaporator from freez...

Страница 13: ...he system prior to charging with refrigerant This prevents scale formation and the possible formation of an explosive mixture of HFC134a and air This will also prevent the formation of toxic phosgene...

Страница 14: ...D EIMWC00208 16EN 14 48 Fig 7 Condenser Located above Chiller Unit Fig 8 Condenser Located below Chiller Unit...

Страница 15: ...ic head should be kept at minimum A check valve must be installed in the liquid line where the ambient temperature can drop below the equipment room temperature to prevent liquid migration to the cond...

Страница 16: ...il would collect at such points and the compressor can become starved If the chiller unit is below condenser loop the discharge line to at least 2 5 cm above the top of the condenser A pressure tap va...

Страница 17: ...se copper conductors only Use of conductors in any material other than copper could cause overheating or corrosion at the connection points and damage the unit To avoid interference all control wires...

Страница 18: ...same voltage as the pump contactor coil The terminals are connected to a clean microprocessor contact The microprocessor contact has the following commutation capacity Maximum voltage 250 Vac Maximum...

Страница 19: ...be of the shielded type and must not be laid in the vicinity of the power cables so as not to induce interference with the electronic controller A digital input allows to enable the current limitatio...

Страница 20: ...adapting the refrigerant load to all foreseen operating conditions Expansion valve The machine has a an electronic expansion valve which is controlled by an electronic device called a Driver that opt...

Страница 21: ...D EIMWC00208 16EN 21 48 Fig 10 Refrigeration cycle EWWD G SS EWWD G XS 23 5 bar...

Страница 22: ...D EIMWC00208 16EN 22 48 Fig 11 Refrigeration cycle EWWD G SS EWWD G XS Partial Heat recovery 23 5 bar...

Страница 23: ...D EIMWC00208 16EN 23 48 Fig 12 Refrigeration cycle EWLD G SS OPTIONAL 23 5 bar...

Страница 24: ...es heat is exchanged with the cooling water thus reducing the temperature until complete evaporation followed by superheating Once it has reached the superheatedvapour state the refrigerant leaves the...

Страница 25: ...process the suction gas penetrates into the profile between the rotor the teeth of the upper satellite and the compressor body The volume is gradually reduced by compression of the refrigerant The com...

Страница 26: ...or Once the flute volume is closed off from the suction chamber the suction stage of the compression cycle is complete 1 2 3 Compression As the main rotor turns the volume of gas trapped within the fl...

Страница 27: ...D EIMWC00208 16EN 27 48 FR3200 Compressor Fig 15 Refrigeration capacity control mechanism of compressor Fr3200 Load Oil supply Oil vent Slide Spring Permanent vent to suction Piston Yoke Unload...

Страница 28: ...Deenergised closed Unload compressor Highpressure oil is admitted to the capacity control cylinder The force of the spring supplemented by oil pressure overcomes the suction discharge differential pr...

Страница 29: ...oorblock disconnector switch terminals The power supply voltage must be the same as that on the nameplate Maximum allowed tolerance 10 Voltage unbalance between the three phases must not exceed 3 The...

Страница 30: ...respectively the average is 383 386 392 387 Volts 3 thus the unbalance percentage is 29 1 100 387 387 392 x below the maximum allowed 3 Electrical heaters power supply Each compressor comes with an el...

Страница 31: ...alve inlet pipe is completely fully without bubbles and that the humidity indicator shows Dry Any bubbles inside the liquid sight glass might indicate a low refrigerant level or an excessive pressure...

Страница 32: ...to remain inactive during the winter season One must remember that once the machine s power supply has been cut off the antifreeze electrical resistance cannot function Do not leave the evaporator an...

Страница 33: ...complete check on the unit and on the state of the pressurised refrigeration circuits carried out after ten years of use in compliance with Italian law Lgs Decree 93 2000 for all groups belonging to c...

Страница 34: ...components for any signs of overheating X Verify operation of compressor and electrical resistance X Measure compressor motor insulation using the Megger X Refrigeration circuit Check for any refriger...

Страница 35: ...n the periodic oil test reveals the presence of acidity TAN is too high Procedure to replace the filter dryer cartridge ATTENTION Ensure proper water flow through the evaporator during the entire serv...

Страница 36: ...6 litres Procedure to replace oil filter 1 Shut down both compressors by turning the Q1 and Q2 switches to the Off position 2 Turn the Q0 switch to Off wait for the circulation pump to turn off and op...

Страница 37: ...ubcooling value can change slightly as the water temperature and the suction superheating vary As the suction superheating value decreases there is a corresponding decrease in subcooling One of the tw...

Страница 38: ...ion pressure increase the microprocessor will control the compressor load in order to allow it to function even if the compressor flow gas must be reduced It also contributes to the oil control logic...

Страница 39: ...erature Evaporation saturated temperature _____ bar Suction gas temperature _____ C Suction superheating _____ C Condensation saturated temperature _____ C Discharge superheating _____ C Liquid temper...

Страница 40: ...he machine in an inappropriate manner beyond its operating limits or not performing proper maintenance according to this manual can void the warranty Observe the following points in particular in orde...

Страница 41: ...an authorized agency Please check with your local requirements Important information regarding the refrigerant used This product contains fluorinated greenhouse gases Do not vent gases into the atmos...

Страница 42: ...gerant charge Factory Field h Greenhouse gas emission of the total refrigerant charge expressed as tonnes of CO2 equivalent m Refrigerant type n GWP Global Warming Potential p Unit serial number 2 The...

Страница 43: ...rigerant charge Factory Field h Greenhouse gas emission of the total refrigerant charge expressed as tonnes of CO2 equivalent m Refrigerant type n GWP Global Warming Potential p Unit serial number 2 T...

Страница 44: ...osal The unit is made of metal and plastic parts All these parts must be disposed of in accordance with the local regulations in terms of disposal Lead batteries must be collected and taken to specifi...

Страница 45: ...D EIMWC00208 16EN 45 48...

Страница 46: ...D EIMWC00208 16EN 46 48...

Страница 47: ...D EIMWC00208 16EN 47 48...

Страница 48: ...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...

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