1. Large Tonnage Chiller AC Screw

2. Content Mechanical System Key Components Control Logic Application 2

3. Mechanical System 3

4. Layout 4 Control panel High Efficiency Shell & Tube Cooler Condenser fans

5. Layout 5 Screw Compressor Pressure gage Condenser coils Easily Accessible Filter Drier

6. 6 Model:380, 500, 900, 1000

7. 7 Model:600, 720, 1200, 1420

8. Key Components 8

9. 9

10. 10

11. 11 Hermetic Semi-HermeticOpen

12. 12 ItemOpenHermeticSemi-Her. Maintenance Easy Break the shell or change new one. Easy Leakage Likelihood of Refrigerant and oil leakage, and it have to be charged.(Y brand) Motor and rotors are in one shell, no leakage. Shaft seal Yes, maintenanceNo Mechanical room Motor heat reject out of compressor, it need ventilation/cooling system. (e.g. 550RT chiller with input power 370kW, so motor heat 37kW have to taken by a 15HP AC.) Just ventilation for flash air.

13. 13 OpenHermeticSemi-Her. CooledAirRefrigerant NoiseHighLowerLow ApplicationFew and refrigerationFewMore BrandYorkDBThe others

14. 14

15. 15 SingleTwinTriple Features Main rotor(metal) and dual gaterotor (Non-metal, GR 1750RPM),tooth ratio 6:11,fitting complicated, flow losses. Metal tooth ratio 5:6 fitting without flow losses. Balanced rotor geometry and shorter screw lengths Efficiency Low efficiency, especial in low speed.Higher Parts The higher speed, the less flow losses, so increase the friction loss, the gaterotor have to be replaced regularly. No Oil -- Less Brand Mcquay(Daikin)Midea and the othersCarrier 23XRV

16. 16 Air cooled — Open Refrigerant cooled — Semi- /Hermetic Features 1. Motor efficiency increase 3%; 2. High maintenance cost; 3. Need ventilation/cooling system, increase initial cost. 4. Does not recharge refrigerant when burnout. 1. Better cooled efficiency; 2. Longer operation life; 3. Burnout can cause catastrophic damage to a chiller. The entire chiller must be cleaned, and the refrigerant replaced. Protection Wiring high temperature, current overload （ Midea ： 1. PTC sensors in each motor winding coil ； 2. Current overload in MIC ； 3. Overload relay. ）

17. Compressor Suction valve Wiring box Rotors Discharge valve Inner Check valve Relief valve Oil separator 10um Oil separator Closed bearing Oil heater Oil server valve Oil level switch Motor Gas filter

18. Overview 18 Compressor

19. Throttle 19 EEV TEV Capillary Orifice Butterfly valve

20. Throttle 20 ItemEEVTEVCapillaryOrificeButterfly valve Compo nents Valve, controller, sensor Valve, bulb, capillary tube Capillary tube Stainless steel plate Valve, driver, liquid level sensor Sensiti vity  Precise flow regulation;  bi-flow operation as well as solenoid tight shut-off;  Wide range control. Hysteresis but stable superheat. Narrow range control.  Precise flow regulation,  bi-flow operation as well as solenoid tight shut-off  Wide range control Price More expensiveBenchmarkCheaperCheapMost expensive

21. Throttle 21

22. Throttle 22

23. Control Logic 23

24. Capacity Control CR2/Y2 CR1/Y1 CR4/Y4 CR3/Y3 24

25. Capacity Control 25

26. Capacity control Compression processCapacity Control 26

27. Fan control 27

28. Fan control Discharge (bar) Fan Quantity  The higher/ lower discharge pressure, the more/less fans On. 28

29. Applications 29

30. 30 Note: 100% load condition. Cooler entering/leaving temperature difference at full load Min~ Max 3~8C Cooler LWT °C Ambient T °C Normal unit High Ambient unit

31. 31 NEW

32. 32 NEW

33. 33

34. 34 Thank You!