commercial air conditioners 2012
Contents
1. ee assets w 7m me oor ose www we we a ee a rmi i DN350 DN350 DN350 DN400 DN400 DN400 DN400 mw ess o wee 117e wm wo we RN Condenser ee o Cooling water inlet outlet 3 temperature C 32 97 oops no omaso woo var onaco ENCCC eee Confguedpower KW 840 875 9 1070 1170 1230 1290 M Staring 10000 A 383 399 427 471 515 542 568 860 O Motor rotate speed Motorrotate speed RPM 2960 Motrcooedby cooled Motrcooedby Refrigerant ECO 26150 28800 29400 29800 RiMaChage 1100 1200 1500 1751 1905 1960 mm 5460 5540 5540 5540 5780 5780 2900 3150 3150 Notes 1 Nominal Cooling capacities are based on following conditions Chilled water inlet outlet temperature 12 C 7 C 53 6 F 44 6 F Cooling water inlet outlet temperature 32 C 37 C 89 6 F 98 6 F 2 The design fouling factor for both evaporator and condenser are 0 086m C kW 0 0005ft2 F hr Btu otherwise can be customized 3 The design working pressure for both evaporator and condenser are 1 0MPa higher pressure demand can be customized Centrifugal Chiller 14 PERFORMANCE CURVE LC350M LC600M Cooling Capacity P2. 605 _ 1360 LC1500MS 1360 ECN ECN EN Pipe Locate Position meme _ vmm _ 18 19 Centrifugal Chiller CONSTRUCTION m LC350M LC600M O Condenser Security Valve Evaporator Security Valve Compressor Motor Lifting Points Evaporator Cil Level Sight Glass Refrigerant Charge valve Refrigerant Level Sight Glass Front View Rear View 10 Air Release Valve 11 Oil Pump 12 Guide Vane Actuator 13 Condenser 14 Oil Reclaim Device 15 Oil Cooler 16 Oil Pump Starter 17 Water Drainage Valve E LC650M LC1700M T 2 3 4 5 6 7 8 9 10 Control Panel 11 Refrigerant Level Sight Glass m Motor Air Release Valve Water Drainage Valve Oil Filter Oil pump Oil Cooler Oil Level Sight Glass Refrigerant Charge valve Evaporator i ML La Centrifugal Chiller Front View 15 Rear View Evaporator Security Valve Compressor Guide Vane Actuator Lifting Points Condenser Security Valve Oil Reclaim Device Liquid Line Butterfly Valve Optional Condenser Discharge Line Butterfly Valve Optional Oil Pump Starter 20 21 Centrifugal Chiller Centrifugal Chiller 22 SERVICE SPACE LC1200MS LC2000MS Front View Rear View Service Space mm OM T z LC350M LC600M 1100 4200 1200 1200 1000 Water outlet inlet
3. a e oo 2o an ae LC750M 5077 2300 2540 2600 1000 4080 LC900M 2190 2500 2625 2800 no 1000 4080 LC1000M 000M LC1200M LC1200M LcisooM 5189 2700 2780 3040 1100 1000 300 300 300 450 600 100 4040 svo mam me m m m m Dm oe LC1500M 5540 2700 2880 3040 1150 950 300 300 300 450 600 120 4340 Lc1zoom 5590 2880 3030 3220 1240 1040 300 300 300 450 600 120 Pipe Locate Position coe Nee Eee conser LC650M 550 mm 1205 1100 DN250 DN250 LC750M m 550 1050 1255 1150 DN300 DN300 560 1110 1425 1250 DN300 LC1000M LC1200M 1155 1480 1350 DN350 DN350 1280 mm 1480 1350 DN350 DN350 LC1500M 500M 1280 1495 1350 DN400 DN400 665 1365 770 1565 1440 DN400 DN400 E LC1200MS LC2000MS Centrifugal Chiller Nut M30 Base of Unit Washer 30 Rubber Pad A15xPxR Steel Base 420xPxR Drainage Line Filled with Concrete Foundation Bolt M30x500 Rubber Pad A15xPxR Steel Base A20xPxS Unit Base gt 5 9 7 mm mm mm mm om mm LC1200MS LC1350MS LC1650MS LC1800MS LC1900MS LC2000MS 929 ms Cua 790 wa 790 790
4. 2012 36 idea COMMERCIAL AIR CONDITIONERS Centrifugal Chiller GD Midea Refrigeration Equipment Co Ltd oh Have received ISO 9001 certification for quality assurance Certificate Registration NO 01 100 019209 MANAGEMENT GD Midea Refrigeration Equipment Co Ltd Have received environmental management system Standard ISO 14001 certification Certificate NO CC 1417 QUALITY MANAGEMENT ISO 14001 2004 Commercial Air Conditioner Business Units Midea Air Conditioning and Refrigeration Sector Add West region of Midea commercial air conditioner department Industry Avenue Beijiao Shunde Foshan Guangdong China Postal code 52831 1 Tel 86 757 22394101 Fax 86 757 26338003 http www midea com http www mideaaircon com Note The data in this book may be changed without notice for further improvement on quality and performance orporate Introduction Midea Group From its humble beginnings in 1968 Midea has developed into a large corporation covering HVAC appliances lighting industrial components logistics and real estate Its 40 years of relentless growth has brought its global turnover to 14 billion USD in 2009 Consequently Midea has created over 150 000 jobs both within China and all over the world In addition to providing affordable goods to consumers worldwide Midea is a responsible corporate citizen and has contributed to several social causes Midea believes in creati
5. 1 L a i ii j 4 i gt gt a Pi 4 MER LA i a i a 1 i 1 a i a a i i a i a 1 3 a i a B i P L a a gt 3 i a i i gt The chillers realize the centralized control by using the RS422 RS484 communication port and the DDC control panel Maximum 32 chillers can be centralized integrate with the relevant cooling water pumps chilled water pumps and cooling towers It includes the reading and writing of data that allow system monitor control and alarm as programmed Also the system can be connected to the DCS BAS IBMS SCADA and achieve remote control Adjustment of chiller operation setpoints Real time inspect and supervision of chiller operation state Real time failure inspects Historical operation data memory Centrifugal Chiller 30 TYPICAL WIRING DIAGRAM MESE EROR NER ORA 3 53 n if 0 os QF3 815 84 Emergency Stop 88 unit Running 92 standby 96 Winding Overheat 98 Interlock Stop 100 Remote Stop 102 Remote Start 6 7 A1 AC DC Converter 2 2 7 9 6 6 6 eee 142 72 Evap Pres VA VA VA elo TE c amen fa 64 come wr M 68 Oil Supply Temp 76 Oil Sump Pres
6. Efficiency Shipping weight Length Width Height Running weight R134a Charge 3 The design working pressure for both evaporator and condenser are 1 0MPa higher pressure demand can be customized 10 11 Centrifugal Chiller LC850M LC900M LC950M LC1000M LC1100M 74 92 EN JJ Cooling 10 kcal h Chilled water flow volume m h Chilled water pressure drop k Evaporator Fouling factor m C kW Water side design pressure Chilled water inlet outlet 7 temperature Water pipe inlet outlet diameter DN300 DN300 DN300 DN300 DN300 Cooling water flow volume m h 611 645 680 719 789 Cooling water pressure drop Pass 2 e Condenser Fouling factor m 0 086 Water side design pressure Cooling water inlet outlet temperature 32 97 Water pipe inlet outlet diameter DN300 DN300 DN300 DN300 DN350 kW Configuredipower 630 630 695 695 760 10000 3 50 Rated Current 380V 1022 1081 1131 1233 329 329 363 363 378 Starting Current 10000V A 272 32 664 92 7 514 D D fa co co co a ls 88 co 0 086 12 7 Motor rotate speed 2960 Motor cooled by Refrigerant meme mm me _ Se EDAD D m Notes 1 Nominal Cooling capacities are based on following conditions Chilled water inlet outlet temperature 12 C 7 C 53 6 F 44 6 F Coo
7. 1406 1582 1758 1934 Chilled water flow volume m h 302 332 Chilled water pressure drop 80 85 82 80 8 Evaporator Fouling factor m C kW 0 086 Water side design pressure Mpa J ES 550 capacity N Chilled water inlet outlet 12 7 temperature eee ive sae feet DN200 DN200 DN200 DN200 DN250 Fouling factor m C kW 0 086 Cooling water inlet outlet x temperature 32 37 Water pipe inlet outlet diameter DN200 DN200 DN200 DN200 DN250 Running power 913 345 Configured power 300 300 385 385 385 Power supply V Ph Hz 380 3 50 Rated Current 380V 424 484 541 578 637 Compressor Starting Current 380V 1538 1538 A Cooling water flow volume 256 292 327 362 397 Condenser Rated Current 10000V Starting 1 000 Motor rotate speed RPM 2960 Motor cooled by Refrigerant 0 626 Shipping weight 7630 8365 Running weight 8938 9795 0 627 Width Height 1850 1850 1850 1850 1990 2054 2054 2054 2054 2162 Notes 1 Nominal Cooling capacities are based on following conditions Chilled water inlet outlet temperature 12 C 7 C 53 6 F 44 6 F Cooling water inlet outlet temperature 32 C 37 C 89 6 F 98 6 F 2 The design fouling factor for both evaporator and condenser are 0 086m C kW 0 0005ft2 F hr Btu otherwise can be customized 3 The design working pressure for both evaporator and condenser are 1 0MPa higher pres
8. 2 SP3 5 4 BP As option or user provide e i Ehe UE B LLI zz gt o o gt n 2 an c on 2 z wow an 3 ouo BD B E 2 Q Q 5 5 0 3 3 0 5 0 9 E LCELE 5 9 2 E 5 5 5 95446 O 66 6 6 O ua 6 2 1 t poe E Remote Staftstop Cooling Water Pump TRTSPSERIS Ed 79 aw ene penere E EEIE oTe Cooling Tower Starter Wiring Diagram Typical g rA LOGO 230RC User supplies wires between starter and compressor refer to user manual Only in system apply electric closing and opening air switch E Oil Pump Wiring Diagram Typical 25 KM1 KM2 Centrifugal Chiller 52 FR1 32 33 Centrifugal Chiller m Recommended Cable Size Y A Cable out Auto transformer in out 10kV 2 LC600M 2xBVR120 LC650M 2xBVR150 LC700M 2xBVR150 LC750M 2xBVR185 LC800M 2xBVR185 LC850M 2xBVR240 LC900M 2xBVR240 LC950M 2xBVR240 LC1000M 2xBVR240 LC1100M 2xBVR300 LC1200M 2xBVR300 LC1300M 2xBVR300 X LC1400M LC1500M LC1600M LC1700M 2xBVR240 a 2xBVR240 2xBVR300 2xBVR300 YJV 25 2xBVR300 YJV 25 3xBVR240 YJV 35 E N N N X 3xBVR240 YJV 35 3xBVR240 YJV 35 3xBVR240 YJV 35 3xBVR300 YJV 35 3xBVR300 35 4xBVR
9. and tightly fitted it allows the compressor to unload smoothly from 10 to 100 load output for excellent operation in real air conditioning application The movement is controlled by a mounted electrical operator in response to refrigeration load on the evaporator Impeller is made of high strength aluminum alloy which is tested at 125 design operating speed E Heat Exchanger Tube Heat exchanger tubes are high efficiency externally and internally enhanced type to provide optimum performance Tubes in both the evaporator and condenser are 3 4 O D copper alloy providing an internal and external surface This provides extra wall thickness up to twice as thick and non work hardened copper at the support location extending the life span of the heat exchanger Each tube is roller expanded into the tube sheets providing a leakproof seal and is individually replaceable Copper alloy material as a standard choice and 90 10 copper nickel 304stainless steel or titanium material can be customized E Evaporator The evaporator is a shell and tube type heat exchanger A flow equalizer provides uniform distribution of refrigerant over the entire tube length to yield optimum heat transfer The evaporator shell contains a dual refrigerant relief valve arrangement set at 185 PSIG 1280 kPa or single relief valve arrangement Intermediate tube support sheets positioned along the shell axis prevent relative tube motion The waterside is hydraulic te
10. can be done after closed the isolation valve in the pipe line Unmatched Oil Reclaim System During the running of chiller unit a small amount of lube may interfuses into the refrigerant Midea patented oil reclaim system designed to return the oil from the heat exchanger back to the oil tank It will improve the refrigerant purity to increase the thermal exchange efficiency and provide sufficient oil to compressor Low Inrush Current Standard starter for Midea centrifugal chiller is a popular type for centrifugal chiller applications that s wye delta starter The motor windings first connect in wye configuration to reduce the inrush current to 33 3 of locked rotor amps and producing 33 3 of normal starting torque After a brief delay transition time the electrical load is momentarily transitioned to resistances while the motor windings are changed to the delta configuration The resistances minimize the second inrush current when the delta configuration becomes active 100 Factory Run Tested In Midea factory after assembled the unit will 100 go through performance test in the test center The benefits of a performance test include verification of performance prevention of operational problems and assurance of a smooth start up A chiller that has been tested is operation and performance proven 08 09 Centrifugal Chiller SPECIFICATION HOMO Cooling LC550M LC350M LC400M LC450M LC500M 1230
11. shaft with a high strength and the high speed shaft is forged with high strength and reliability Em Motor Midea centrifugal chiller use semi hermetic two pole motor and is cooled by the circular refrigerant winding embedded sensors provide positive thermal protection to the motor Asynchronism squirrel cage type motor can achieve higher operation performance and longer life span Refrigerant cooled motor keeps motor heat out of the mechanical room decrease vibration and shaft seal maintenance compare with open motors Also refrigerant cooled motor have lower inrush currents and lower noise than open motor which cooled by air there is no need to provide additional ventilation or air conditioning for the mechanical room than open motor design The motor is bolt connected to the compressor gear housing and shaft labyrinth seal prevents refrigerant leakage from the motor to the gear box Low voltage motor provides 6 terminals for reduce starting voltage wye delta or auto transformer start High voltage motor provides three terminal posts for full voltage across the line Motor terminal pads are supplied A moveable steel sheet terminal box encloses the terminal board area to insulation Impeller And Inlet Guide Vane High strength aluminum alloy compressor impellers feature backward curved vanes for high efficiency Airfoil shaped inlet guide vane minimize flow disruption for the most efficient part load performance Precisely positioned
12. temperature sensor 8 Water Drainage Valve Security Valve 9 Evaporator LC650M LC1300M 1500 4500 1300 1300 1000 Guide Vane Actuator 10 Control Panel Compressor 11 Motor Connection Box LC1400M LC1700M 1500 5300 1300 1300 1000 Oil level Sight Glass 12 Economizer Motor 13 Condenser LC1200MS LC2000MS 1500 5300 1300 1300 1000 Air Release Valve 14 Electric Valve Oo oP WN 23 Centrifugal Chiller INSULATION Note The gray area need to be insulated Normally the chiller is insulated in the factory If the chiller has to be insulated in the jobsite it must ensure that Moveable components and parts shouldn t be affected by insulation Please don t leave connecting bolt in insulation Please don t leave name plate in insulation Please open water box cover when clean the evaporator tubes Centrifugal Chiller REFRIGERATION CYCLE CONDENSER EB Refrigeration system Midea LC centrifugal chiller is the steam compressing cycle type The refrigerant will be imposed vertical energy by the high speed impeller to increase its temperature and pressure The high pressure and temperature refrigerant gas will release its thermal energy to the cooling water in condenser thus decrease its temperature After throttled by the orifice its pressure will be decreased dramatically In evaporator the low temperature and low pressure refrigerant will absorb the thermal energy from the chilled water to evapora
13. 240 YJV 50 4xBVR240 50 4xBVR240 YJV 50 LC1200MS LC1350MS LC1500MS NOTE 1 The table listed the recommended cable cross section mm 2 Use copper cable only 3 Application must in accordance with IEC standard and local or national regulations N X X N X N b X X Centrifugal Chiller 34 TYPICAL PIPING AND CABLE LAYOUT Choose the proper power supply cable size and tag clearly Filter must be used in the water system Thermometer and pressure meter must be installed in the water system Recommend to use a steel pipe to connect the security release valve to the outside Recommend to use an oxygen density indicator that alarm automatically when the density lower than 19 5 Cable and pipe layout should be done based on local regulation 35 Centrifugal Chiller MECHANICAL SPECIFICATION E Compressor Single stage centrifugal compressor with high strength aluminum alloy fully shrouded impellers and moveable inlet guide van The enclosed type impeller is designed for balanced thrust and is dynamically balanced and overspeed tested for smooth vibration free operation Airfoil shaped inlet guide vane minimize flow disruption for the most efficient part load performance The movement of the inlet guide vane is controlled by a mounted electric actuator in response to refrigeration load on the evaporator The rotor assembly consists of a heat treated alloy steel drive
14. 80 Vane Position 82 Unit Current 66 on sump Temp a 58 Chilled WET 60 Chilled WLT 22 21 17 18 1 2 4 5 7 8 9 10 13 14 3 6 Analog Transform Board 19 20 24 23 Main Switch On Main SwitchOff 3 Vane Open 5 Vane Close 7 Hot Gas Solenoid E 5 0 I 2 o LO 97 Cooling Water Pump 21 Alarm Stop 25 Oil Pump 27 Oil Heater 29 Standby 31 Standby 33 Standby 30 Cooling Tower 9 M COMV1 V2 V3 V4 COMO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 oe 5 Al Module A6 16 Points Relay Output Module 31 Centrifugal Chiller Power 220V 1N 50HZ 1KVA User furnishes connection PCM Unit Control Box Unit Current 3 12 Unit Running IA MEA ol Box Starter Eps a EG EORR EC CR EI pw a s between starter and control box recommend 10 1 0mm User supplies wires EH1 sheath wire User supplies wires between switchbox and starter between starter and compressor 2M 5 POWER Oil Pump Oil Heater Standby Power 380V 3N 50HZ 5KVA Compressor Motor PCM Unit Control Box Al ed To TS To Tu Te T Tz m YM2Hot Gas Solenoid Only apply on LCS User connects control wires 52 _ p LE BERE 53 LEE 5 S _ gt 52 S SS eS NN M ES ES ES ES ES DN M IE ST2 ST3 ST4 ST5 ST6 1
15. Overload Protection The oil pump control panel will monitor the current of oil pump and shut the chiller off when the oil pump current exceeds its maximum set point High Condenser Pressure Protection The chiller controllers algorithm keeps the condenser pressure under a specified maximum pressure The chiller can run up to 100 percent of this setpoint in a safe and reliable condition If the condenser pressure exceeds the set point the system will prohibit the open of the inlet guide vane to decrease the pressure or shut off the chiller immediately according to the different set point Low Evaporator Pressure Protection The chiller controllers algorithm keeps the evaporator pressure under a specified minimum pressure The chiller can run up to 100 percent of this setpoint in a safe and reliable status If the evaporator pressure decreases below the set point the system will prohibit the open of the inlet guide vane to increase the pressure or shut off the chiller immediately according to the different set point Water Flow Protection The water flow switches is required to install in the water piping system The chiller controller has a digital input that will indicate the water flow When this input does not prove flow within a fixed time during the starting the process will be terminated If the flow is lost while the chiller is in running the system will shut the chiller off to protect the chiller from possible damage m Starter Failure
16. Protection Centrifugal Chiller m Low Chilled Water Outlet Temperature Protection Low chilled water outlet temperature protection also known as anti freeze protection avoids water freezing in the evaporator by immediately pause the chiller if the chilled water outlet temperature reaches its minimum allowable value After the chilled water inlet temperature reach the restart set point the chiller will start automatically This protection may be due to the sensor fault incorrect set point of chilled water outlet temperature or lack of chilled water flow B Current Overload Protection The control panel will monitor the current drawn by each line of the motor and if the highest of the three line currents exceeds 110976 of the rated current the system will close the inlet guide vane automatically and check whether the current decrease to normal condition And the system will shut the chiller off if the highest of the three line currents exceeds 11590 of the rated current The current overload protection does not prohibit the chiller from reaching its full load ampere E High Motor Winding Temperature Protection This function monitors the motor temperature and terminates chiller operation when the temperature is excessive The controller monitors the winding temperature sensors any time the controller is energized And immediately shut the chiller off if the temperature surpasses the maximum set point E Start Time Limit Protection When sta
17. e useful for specific regions CONVERSION TABLE E Temperature F C Formulas Cz F 32 x5 9 F Cx9 5 32 E NE TN 0 ws ma o _ 428 60 482 90 Fahrenheit 104 0 109 4 Centrifugal Chiller Celsius 39 0 40 0 41 0 42 0 43 0 44 0 45 0 46 0 47 0 48 0 49 0 50 0 51 0 52 0 53 0 54 0 55 0 56 0 57 0 58 0 59 0 61 0 62 0 63 0 64 0 65 0 67 0 68 0 70 0 71 0 72 0 40 E Pressure PSI kPa kg m Formulas 1 6 894757 4187 oaz 86 5516 056 eo 6205 foss 413 69 4 660 45505 464 47574 ass 1 0 070306958kg m 200 62053 633 6190 6 75 682 58 695 28 662 59 6 00
18. ensing temperature Low chilled water outlet temperature Critical inlet guide vane opening Critical water temperature Note Setting values refer to user manual Capacity Control Minimum IGV opening control Maximum main motor current control Leaving chilled water temperature control Inlet guide vane actuator Manual mode option 27 Centrifugal Chiller STANDARD PROTECTION Low Supply Oil pressure Difference Protection Oil pressure is indication of oil flow and oil pump operation A significant drop in oil pressure difference indicates a failure of the oil pump oil leakage or other blockage in the oil circuit The differential pressure during compressor pre lube mode should not fall below set point A failure on meets this requirement leads to inhibit the start of the chiller When the compressor is running an alarm will be displayed if the differential pressure is below set point And if this value decreases to the minimum set point the chiller will shut down Oil Temperature Protection High oil temperature when the oil pump and or compressor are running may be an indication of oil cooler failure overheating of the oil and the bearings or oil filter blockage If the oil temperature continuous increase to the maximum set point the chiller will shut down The start of the compressor will be inhibited if the oil sump temperature is below the set point The diagnostic will display at the user interface Oil Pump Current
19. erature Condensing pressure Evaporating pressure Oil supply temperature Oil supply pressure Oil sump temperature Oil sump pressure Oil supply pressure difference Inlet guide vane opening Running current percentage Total power on time Total running time Total start up time E Safety Cutouts The all protection control if necessary shuts the chiller off or limits the open of inlet guide van to protect the chiller from possible damage Inadequate oil supply pressure difference Excessive oil supply temperature Inadequate oil sump temperature Oil pump current overload Inadequate chilled water flow Low chilled water outlet temperature Compressor motor current overload Excessive main motor winding temperature Excessive Start time Inadequate evaporation pressure Excessive condensing pressure Temperature transmitter faults Pressure transmitter faults Starter faults Phase unbalance phase loss phase reversal Under voltage Over voltage Restart temperature Pause temperature Current limit Full load rated load Chilled water outlet temperature Rated motor currency System control mode Low oil supply pressure difference before start Low oil supply pressure difference after start Minimum oil supply pressure difference Minimum oil sump temperature High oil supply temperature Maximum oil supply temperature Low evaporation pressure Minimum evaporation pressure High condensing temperature Maximum cond
20. ercentage 96 140 LLLLLLLLLLLLLLLL ESSE PER e 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 CET C Note CET condenser entering temperature ELT evaporator leaving temperature LC650M LC1300M Cooling Capacity Percentage SST SSSR SISSON pompe SL LL LL LL LLL Ll CET Note CET condenser entering temperature ELT evaporator leaving temperature 15 Centrifugal Chiller LC1400M LC1700M Cooling Capacity Percentage 96 140 130 120 110 100 90 80 70 60 m ELT AAT EL LLL HL 50 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 CET C Note CET condenser entering temperature ELT evaporator leaving temperature LC1200MS LC2000MS Cooling Capacity Percentage 140 L eo oi _ oi eL 1 _ 24 25 26 27 28 29 30 31 32 39 34 35 36 37 38 CET C Note CET condenser entering temperature ELT evaporator leaving temperature DIMEN Centrifugal Chiller SION E LC350M LC600M LC350M LC500M LC600M Unit Base Pipe Locate Position A mm 16 17 Centrifugal Chiller E LC650M LC1700M 77 b 1583 Base GPR LC650M
21. es lowest toxicity and flammability rating which translate into lowest hazard High Reliability Single stage Semi hermetic positive pressure compressor utilizes advanced international leading NREC design technology Single stage design eliminate the additional moving part in the multi stage compressor such as second impeller this feature increased the reliability The refrigerant cooled hermetic motor sealed from the external air and environment that greatly eliminates the contaminant possibility Combine with shell tube type heat exchangers designed manufactured and tested according to the national standard of China These practice ensure Midea centrifugal chiller achieve high reliability The motors are hermetically sealed from the machineroom cooling is accomplished by spraying liquid refrigerant on the motor windings and shaft This highly efficient cooling method results in the use of smaller cooler running motors As a result hermetic motors require lower inrush current and are smaller lighter and quieter than comparable air cooled motors m Modular Construction The evaporator condenser and compressor assemblies are completely bolted together making the chillers easy to disassembly and reassembly at the jobsite This feature makes the chiller easy for transportation and lessen access problem in the jobsite This attribute can mean considerable installation cost savings on many retrofit applications that may have limited doorway s
22. formance of Midea product as well as to match the actual requirements of your HVAC system Midea launched its first generation chiller products selection software at the end of 2010 This independent software can select the best components configuration according to the requirement of your HVAC system After input the general parameters such as cooling capacity fouling factor pass number power supply etc Nominal data and physical data for typical compressor evaporator condenser combinations are given by product list Midea R amp D fellow and software engineers will update the improvement information of the product online in time and our customer can get the update information through the internet de i memi i Selection output Part load performance Curve OPTIONS Across the line starter Auto transformer starter Higher water side pressure 1 6Mpa Communication protocol Hostlink Modbus 10kV power supply for 650 2000RT ABB high voltage vacuum contactor and protection module Refrigerant isolation valves on condenser Customized pass on evaporator condenser Customized marine water box on evaporator condenser Sectional shipment Spring vibration isolation Evaporator shell is 1 1 2 Inch 40mm insulation Evaporator condenser water pipe victaulic connection Fouling factor Evaporator 0 0172 0 344m k kW condenser 0 044 0 344m k kW Note Some of the options list above may not b
23. ineered gearing double soundproof gearbox structure optimized impeller and tunnel design ensure our chiller achieve lower sound levels A gear driven compressor runs at higher impeller rotational speeds but tends to have less vibration than the larger much heavier direct drive units Advanced Capacity Adjustment Inlet guide vanes work together with moveable diffuser lead to stepless capacity range from 10 to 100 and free of surge This is why Midea centrifugal chiller can achieve high part load efficiency And this technology was awarded by the State Intellectual Property Office of P R China Patent No ZLO1 2 56824 4 Centrifugal Chiller m Condenser Baffle The baffle prevents direct impingement of high velocity compressor gas onto the condenser tubes That eliminates the related vibration and wears of the tubes and distributes the refrigerant flow evenly over the length of the vessel for improved efficiency Reliable Lubricant System The lubrication system consists of an internal oil sump with oil heaters positive displacement oil pump brazed plate oil cooler and oil return line High position oil sump supply oil to the gear surface for lubrication prevent the gear from burnt if sudden power loss happens External Oil Filter and Oil cooler A plate type oil cooler is factory mounted aside the compressor An external oil filter and oil cooler is easy to do maintenance and replacement Change of the oil filter or oil cooler
24. ize 06 07 E High Efficiency Fully shrouded Impeller Centrifugal Chiller Fully shrouded impeller features high strength aluminum alloy backward curved vanes refrigerant gas flows through the internal impeller passages without hydraulic interaction with the stationary casing walls The impeller is designed for balanced thrust and is dynamically balanced and over speed tested Keyless Impeller Coupling The impeller and the main shaft are coupled by keyless connection it eliminates stress concentration on the power transmission surface and thus the life span of the impeller is greatly increased Since there is no friction the efficiency is higher than the traditional key coupling This unmatched mechanical design was awarded by the State Intellectual Property Office of P R China Patent No ZL 01 2 56825 2 Precise Gearing The specially engineered single helical gear with crowned teeth keep more than one tooth in contact at all times to provide even distribution of compressor load and quiet operation Gear tooth surfaces are case hardened and precision ground which can reach the class of 5 Gears are integrally assembled in the compressor rotor support and are oil film lubricated Each gear is individually mounted in its own journal and thrust bearings to isolate it from impeller and motor forces The double layer soundproof compressor design prevents the gear contacting noise Lower Sound Levels and Vibration Special eng
25. l enterprises plus the independent R amp D Midea CAC achieves big success in the commercial air conditioner market and has established thousands of sample projects all over the world Right now Midea CAC is one of the most professional CAC products supplier as well as the professional project solution provider in marketing sales project design and after service etc MCAC Chongqing factory with 14 product lines concentrates on the water cooled centrifugal screw scroll chillers Air cooled screw scroll chillers AHU FCU etc MCAC Shunde factory with 31 product lines concentrates on the DC inverter product Digital scroll product split product heat pump water heater AHU FCU etc CHILLER MANUFACTURING BASE INTRODUCTION With 46 years experience in chiller industry Midea Chongqing chiller manufacturing base is becoming one of the largest chiller company in China It covers an area of 800 Mu 137 acre with a registered capital of 12 5 million US and a total investment of over 0 6 billion US There are 6 product series and over 100 model products including centrifugal chiller screw water chiller scroll water chiller water cooled packaged unit and central air conditioning indoor terminal device AHU FCU Five chiller manufacturing shops with 14 flexible production lines lead an anual manufacturing capacity of 250 units centrifugal chiller 1000 units of air cooled screw chiller 2000 units of water cooled
26. ling water inlet outlet temperature 32 C 37 C 89 6 F 98 6 F 2 The design fouling factor for both evaporator and condenser are 0 086m 0 0005ft2 F hr Btu otherwise can be customized 3 The design working pressure for both evaporator and condenser are 1 0MPa higher pressure demand can be customized Centrifugal Chiller HE 1700 5 95 102 115 120 118 120 es Ra Ree Evaporator isin doer noo omaso omaso omaso ono KPa 96 94 105 108 115 112 EN Waepeeaaedenew Dwaso aso Naso Doo ONAOD_ A 9 9 9 65 7 _ Motor rotate speed RPM 2960 Motor cooled by Refrigerant 065 0627 0621 0620 069 a Notes 1 Nominal Cooling capacities are based on following conditions Chilled water inlet outlet temperature 12 C 7 C 53 6 F 44 6 F Cooling water inlet outlet temperature 32 C 37 C 89 6 F 98 6 F 2 The design fouling factor for both evaporator and condenser are 0 086m C kW 0 0005ft2 F hr Btu otherwise can be customized 3 The design working pressure for both evaporator and condenser are 1 0MPa higher pressure demand can be customized 12 13 Centrifugal Chiller eee 200MS LC1350MS LC1500MS LC1650MS LC1800MS LC1900MS 2000 5
27. nd other moving parts Since there are no moving parts it can achieve high reliability and minimum the possibility of failure E Control Panel Midea adopts the state of the art microprocessor control system with 10 4 inch LCD touchable screen and high disturbance resistance The LCD touchable screen with graphical display of chiller parameters fast and easy to access makes the operation relatively simple It also can communicate with the user s PC and carry out the remote control for start operation and stop of the cooling system More than 30 item protections and malfunctions used to make the chiller operation secure and reliable The latest 10 items of failure information can be recorded for inquiry E Lubrication System A separately driven electric oil pump assembly Sing Valve supplies lube to the compressor at proper temperature and pressure After filtration the lube been pressed to the oil cooler to cooling it to certain temperature And then adjust its pressure before transmitted to bearings Oi Pum vame Special designed seals are installed at inner side of motor bearings at both ends to minimize the lube that leaked into the main motor and mixed into the R134a in evaporator Besides electric heater is used inside the oil tank to maintain the oil in proper temperature all the time In this way when the compressor shuts down certain oil temperature can be maintained Thus prevent the R134a gas from entering
28. ng value through rapid response to market demands cost efficient operations and consumer satisfaction As a result Midea wields vast production capacities to meet these demands a fully integrated manufacturing process and a comprehensive range of affordable high quality products to serve its global customers Today Midea is a home appliance leader in China The company continues to actively globalize its operation by opening plants in Vietnam Belarus and Egypt Additionally Midea has several forthcoming plants in order to offer enhanced products and services closer to the market Sp CB E ET 2 NRTLIC pe TL X a gt ibe Es 7 PE m rt 8 maT lt E cO W 3 j E 1 1 eas Cem _ D 1 z DRILL CES LI r T T yt 4 Midea MCAC As a key part of Midea Group the Midea Central Air Conditioner CAC Business Unit is a professional CAC products supplier and commercial products solution expert Since 1999 Midea central air conditioner contributes to the commercial product R amp D and technology innovation By cooperating with the internationa
29. rt the chiller if the time from Wye connection change to Delta connection exceeds set point The system will shut the chiller off immediately to protect the chiller from possible damage m Power Supply Protection A factory installed transformer or power supply protection module in the starter if any overvoltage or undervoltage phase unbalance phase loss phase reversal happens the control system will detect it and shut the chiller off in time The chiller will protect itself from a starter failure that ensures the compressor motor disconnecting from the line when the motor reach the limits of its capabilities The controller starts and stops the chiller through the starter If the starter malfunctions and does not disconnect the compressor motor from the line in an emergency situation the controller will recognize the fault and shut the chiller off immediately 28 29 Centrifugal Chiller CENTRALIZED CONTROL PC Workstation PC Workstation Datebase server F E E a k S m Gm Go F r i i a LI L 4 a a a a i a a ii a a L i a E i a 8 E i a E i i X i a a
30. s None single stage Product series code Cooling capacity RT R134a centrifugal chiller Semi hermetic Motor Centrifugal Chiller FEATURES AND BENEFITS Near half a century of experience in design and manufacture of the chiller product enable Midea Company continues deliver products of high quality high reliability and high efficiency to our customers all over the world Midea independent designed second generation Smart Star centrifugal chiller use environment friendly R134a refrigerant which is not subject to scheduled phase out And it has been proven can achieve high efficiency without compromising the environment and the effects of direct and indirect global warming potential are dramatically diminished Environment Friendly R134a Environment and its sustainability is the responsibility of any company who can supply excellent products and service to the customers Midea has long been committed to the environment and its sustainability the Midea Smart Star centrifugal chiller provide our customers with a non ozone depleting R134a refrigerant that can achieve high efficiency Chlorine free long term solution without subject to refrigerant phase out At the same time R 134a chillers operate with the entire system above atmospheric pressure at all times no need purge unit In the event of a small leakage refrigerant escapes from the chiller to 4 the atmosphere that allows easy detection and repair And H134a featur
31. screw chiller and 200000 units of AHU product Strong R amp D and manufacturing capacity makes Midea Chongqing general become the fastest developing company in chiller industry The chiller test lab which is certified by China National Refrigeration Equipment Inspection Center is the largest refrigeration test capacity in Asia The engineer team with 100 top engineers and 2 chiller experts who were awarded by the central government in structure electricity performance testing and software aspect makes Midea the headship in chiller industry In the year of 2011 Midea refrigeration group invests another 150 million RMB for test lab as ARI test floor big capacity air cooled screw life span testing room 1500kW compressor motor test floor etc Concentrating on energy saving and ejection decreasing Midea Chongqing chiller factory commits itself to the reliable and high efficiency products for the world The chiller products are widely used in different countries and obtain good public praise from the clients The solutions for the Beijing capital international airport Jakarta international airport China rapid transit station won good feedback and commendation Continuing with the past and opening up the future Midea chiller brand will go further and create an illustrious future 05 gt 06 09 14 P 16 P 25 gt 30 P 35 05 Centrifugal Chiller NOMENCLATURE Power Supply 10 10kV None 380V Centrifuge series S dual stage
32. sted at 1 5 times of the maximum working pressure E Condenser The condenser is shell and tube type with discharge gas baffle to prevent direct high velocity gas impingement on the tubes The baffle is also used to distribute the refrigerant gas flow properly for most efficient heat transfer An integral sub cooler is located at the 4 bottom of the condenser shell providing highly effective liquid refrigerant subcooling to provide the highest cycle efficiency Regarding the duel stage compressing using the economizer can improve the efficiency by 5 8 The condenser contains a refrigerant relief valve sets at 1 6 MPa Standard maximum waterside working pressure is 1 0 MPa The waterside is hydraulic tested at 1 5 times of maximum working pressure Centrifugal Chiller 36 37 Centrifugal Chiller Water Box The removable water boxes are fabricated of steel The design working pressure is 150 PSIG 1034 kPa and the boxes are tested at 225 PSIG 1551 kPa Integral steel water baffles are located and welded within the water box to provide the required pass arrangements The nozzle connections are suitable for flanges and are capped when shipment Plugged 3 4 drain and vent connections are provided in each water box E Orifice For proper refrigerant flow control and reliable throttling Midea smart star design applies a fixed single hole orifice system It eliminates thermal expansion valves float valves a
33. sure demand can be customized Centrifugal Chiller LC800M LC600M LC650M LC700M LC750M 600 650 700 750 2637 10 kcal 181 1 20 _ 211 226 Chilled water flow volume m h 452 484 Chilled water pressure drop kPa 82 86 92 0 Fouling factor m C kW 0 086 Water side design pressure Chilled water inlet outlet 12 7 temperature Water pipe inlet outlet diameter DN250 DN250 DN250 DN250 DN300 m h 433 466 501 537 575 Cooling water flow volume Condenser JJ 80 2814 Cooling capacity N D c Fouling factor Water side design pressure Cooling water inlet outlet temperature Water pipe inlet outlet diameter DN250 DN250 DN250 DN250 DN300 Configured power kW 490 490 560 560 V Ph Hz 380 6000 10000 3 50 Compressor Rated Current 380V A 741 798 858 913 Starting Current 380V 2225 2225 Rated Current 10000V 33 256 S N i Starting Current 10000V 256 292 292 Motor rotate speed 2960 Motor cooled by Refrigerant 0 627 Notes 1 Nominal Cooling capacities are based on following conditions Chilled water inlet outlet temperature 12 C 7 C 53 6 F 44 6 F Cooling water inlet outlet temperature 32 C 37 C 89 6 F 98 6 F 2 The design fouling factor for both evaporator and condenser are 0 086m C kW 0 0005ft2 F hr Btu otherwise can be customized 0 625
34. the oil to decrease the efficiency of lubrication Therefore while the compressor is shut down it is necessary to keep oil heater on to make the oil temperature in certain temperature If the compressor will out of service for a long time it is required to run the oil heater to maintain the proper oil temperature Centrifugal Chiller OIL CLAIM reclaim system Condenser Compressor Inlet Evaporator Oil Refrigerant Purifying Device During the running of refrigeration unit it is inevitable that a small amount of lube interfuses into the refrigerant especially when the cooling load is very low The mixed oil refrigerant goes through compressor bearings and gearbox and then interfuses into the condenser Because the density of lube is higher than refrigerant after the refrigerant was evaporated the lube will float on the liquid refrigerant Midea patent designed oil reclaim device is factory mounted below the condenser The oil reclaim system is capable of return the oil from the heat exchanger back to the oil tank with high efficiency Thus it will improve the refrigerant purity to increase the efficiency of chiller and supply sufficient oil to compressor K2 and K3 LE EM of and oil Manual omm x epa e x fo Note on off A K1 5 K10 keep open 38 39 Centrifugal Chiller SELECTION SOFTWARE For optimize the configuration and per
35. ting The low temperature chilled water produced in this refrigeration circulation One refrigeration circulation includes four indispensable processes compressing condensing throttling and evaporating 24 25 Centrifugal Chiller Centrifugal Chiller 26 MICROPROCESSOR CONTROL Microprocessor control E Basic Indication Items E User Settings Professional designed microprocessor controller combine with state of the art control logic provide the safety capacity control interlock and indications necessary to operate the chiller in a safe and efficient performance The microprocessor control in Midea centrifugal system is factory mounted wired and tested to ensure machine operation in a proper condition and meets the programmed control logic Control system Touchable screen graphical display and convenient operation Menu driven keypad interface Component test and diagnostic function Programmable Logic Controller optimize performance Display operation parameters Real time monitoring function Precise pressure and temperature control More than 30 items of protections and alarms Languages pre programmed at factory for English Chinese Precise design and compact layout Modular construction easy for maintenance RS485 compatible maximum 32 chillers and accessory equipments be centralized Chilled water inlet temperature Chilled water outlet temperature Cooling water inlet temperature Cooling water outlet temp
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