Midea LSBLG MCF Series Technical & Service Manual
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Midea LSBLG MCF Series Technical & Service Manual

Water cooled screw chiller
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Technical Service Manual
Water Cooled
Screw Chiller
Model:
LSBLG***/MCF （Flooded Type）

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Summary of Contents for Midea LSBLG MCF Series

  • Page 1 Technical Service Manual Water Cooled Screw Chiller Model: LSBLG***/MCF （Flooded Type）...

  • Page 2: Table Of Contents

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Contents I. Safety precautions ....................3 Installation safety considerations ....................3 Maintenance safety considerations ..................... 3 Repair safety considerations ....................... 5 II. Product ........................7 General Information ........................7 Features ............................9 Specifications ..........................
  • Page 3 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Wiring installation ........................80 VI. Commissioning ....................82 Pre start-up ..........................82 Start-up ............................86 VII.Maintenance ......................88 1. Daily maintenance......................... 88 2. Maintenance ..........................92 VIII.Troubleshooting ....................99 1. Protection items ..........................99 2.

  • Page 4: Safety Precautions

    If damage is detected upon receipt, immediately submit a claim with the shipping company. Midea strongly recommends employing a specialist company to unload the machine.
  • Page 5 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 (1) Engineers working on electric or refrigeration components must be authorized, trained and fully qualified to do so. All refrigerant circuit repairs must be carried out by trained personnel fully qualified to work on these units. He must have been trained and be familiar with the equipment and the installation.

  • Page 6: Repair Safety Considerations

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) corrosion on the internal walls and on non-protected steel surfaces. Repair safety considerations Note: It is compulsory to wear personal protection equipment. The insulation must be removed and warming up must be limited using a wet cloth. Before opening the unit, ensure that the circuit has been purged.
  • Page 7 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 must never be modified to add refrigerant and oil charging, removal and purging devices. All these devices are provided with the units. Refer to the certified dimensional drawings for the units.  Do not re-use disposable (non-returnable) cylinders or attempt to refill them.

  • Page 8: Product

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) II. Product General Information 1）Product Line Up Cooling Capacity Quantity of Series Model Power Supply (kW) Compressors LSBLG340/MCF 380V/3Ph/50Hz LSBLG440/MCF 380V/3Ph/50Hz LSBLG540/MCF 380V/3Ph/50Hz Single LSBLG720/MCF 380V/3Ph/50Hz compressor LSBLG805/MCF 380V/3Ph/50Hz LSBLG890/MCF 380V/3Ph/50Hz LSBLG1055/MCF 380V/3Ph/50Hz 1055 LSBLG1200/MCF...
  • Page 9 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 3). External appearance Single head (LSBLG340/MCF~LSBLG1055/MCF) Dual heads (LSBLG1200/MCF~LSBLG1780/MCF)

  • Page 10: Features

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Features High efficiency  The high efficiency inner grooved copper pipe enhances the heat-exchange process, improves heat exchange efficiency and makes the evaporator more compact saving installation space.  Significantly improves the evaporating temperature and reduces the heat transfer temperature difference, which directly improves heat-exchange efficiency, and provides the most cost effective and reliable solutions to all customers.
  • Page 11 SKF brand industry use bearing guarantees 60,000 hours of continuous working Advanced twin-rotor screw compressor Midea® Screw Chiller is equipped with the 3rd generation industrial Semi-hermetic Screw compressor, which has the latest advanced 5-6 asymmetry dentiform rotors. The rotors are processed by high-precision CNC and each part is well-proportioned and non-gap matched, which minimizes friction and clearance loss, guaranteeing quiet running and long duration.
  • Page 12 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC)  High-precision machining and measurements make the rotor clearance μm-class, reducing leaks between high and low pressure. Under continuous operations, the rotors maintain optimal clearance for the highest efficiency.  The semi-hermetic compressor with low running noise is well cooled by the refrigerant, giving a low temperature, and no leakage compared with an open compressor.
  • Page 13 Condenser  Midea condenser has a specially designed baffle, in the condenser’s entrance to prevent high-velocity refrigerant gas hitting the tube surface, eliminating the related vibration and noise. It has been tested under extreme conditions. Water side working pressure is designed for 1.0 Mpa (Higher pressure vessels can be customized).
  • Page 14 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Lubrication cycle Three stages of oil separation ensure excellent compressor lubrication. One is integrated inside the compressor and the other is a built-in oil separator located inside of the condenser. The refrigerant and oil mixture is separated in the internal oil separator for the first time, and then is sent to the condenser oil separator where separating efficiency can reach 99%.

  • Page 15: Specifications

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Specifications LSBLG /MCF 1055 Cooling capacity 336.6 435.7 534.5 712.7 797.2 881.5 1045 Power input 59.77 76.71 93.65 127.0 143.7 154.4 185.9 kW/kW 5.631 5.679 5.707 5.611 5.547 5.709 5.621 Semi-hermetic screw compressor Circuit A Quantity Circuit B...
  • Page 16 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) LSBLG /MCF 1200 1300 1410 1620 1780 Cooling capacity 1186 1286 1396 1600 1759 Power input 205.2 230.7 248.7 290.3 304.8 kW/kW 5.779 5.574 5.613 5.512 5.771 Semi-hermetic screw compressor Circuit A Quantity Circuit B Quantity...

  • Page 17: Outline Dimension

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Outline dimension Single head (LSBLG340~1055/MCF) Chilled Cooling water inlet water outlet Chilled Cooling water outlet water inlet Unit: mm Water Ａ Ｂ Ｃ Ｄ Ｅ Ｆ Ｇ Ｈ Model inlet/outlet LSBLG340/MCF 3496 1200 1716 2850...

  • Page 18: Refrigeration System

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Refrigeration system For single compressor (LSBLG340~1055/MCF) For dual compressors (LSBLG1200~1780/MCF)

  • Page 19: Major System Components

    6.1 Advanced twin screw compressor  Midea screw chiller is equipped with the 3rd generation industrial compressor, which has the latest advanced 5-6 Asymmetry Dentiform Semi-hermetic Screw Rotors. The rotors are processed by high-precision CNC and each part is well-proportioned and no-gap matching, which minimizes friction and clearance lost, guaranteeing quiet running and service life.
  • Page 20 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC)  Lubricant: The lubricant is supplied automatically by pressure difference inside the compressor. It is unnecessary to add an extra lubricant pump. The compressor is approved for use with the following lubricant: HBR-B04 for R134a unit ...
  • Page 21 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 6.2 Pressure vessels 6.2.1 General Monitoring during operation, re-qualification, re-testing and re-testing dispensation:  Follow the regulations for monitoring pressurized equipment.  The user or operator should set up and maintain a monitoring and maintenance file. ...
  • Page 22 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) The ball valve can protect life and property because it can prevent refrigerant from flowing into the air when the safety valve is open or replaced. 6.2.6 Evaporator Gas refrigerant Chilled water outlet Chilled water inlet Liquid...

  • Page 23: Water Flow

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Water flow Balance the chilled water flow through the evaporator and the condenser water flow through the condenser. The flow rates must fall between the minimum and maximum values shown in the table below.
  • Page 24 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Water pressure drop curve(evaporator) LSBLG1200/MCF LSBLG1300/MCF LSBLG1410/MCF LSBLG1620/MCF LSBLG1780/MCF 100.0 200.0 300.0 400.0 Water flow(m Condenser Water pressure drop curve(condenser) LSBLG340/MCF LSBLG440/MCF LSBLG540/MCF LSBLG720/MCF LSBLG805/MCF LSBLG890/MCF LSBLG1055/MCF 50.0 100.0 150.0 200.0 250.0 300.0 Water flow(m Water pressure drop curve(condenser)
  • Page 25 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 System minimum water volume A set water volume is necessary for stable operation. It is often necessary to add a buffer water tank to the circuit to achieve the required volume. The tank must be internally baffled to ensure the liquid (water or brine ) is properly mixed.

  • Page 26: Operating Range

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Operating range Content Running range Chilled Leaving Water Temperature 5℃～15℃ Cooling Entering water Temperature 25℃~35℃ Water flow volume Flow volume rating± 20% Max inlet/outlet water Temp. difference 8℃ Voltage tolerance Rating Voltage ± 10% Phase tolerance ±...

  • Page 27: Accessories

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Accessories Standard accessories Name Quantity User manual Water pressure difference switch Packing list Optional Accessories Name Model Instructions Picture Installed on evaporator Water flow WFS-1001-H outlet pipe to prevent heat switch (Honeywell) exchange pipe from frost cracks.

  • Page 28: Control

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) III. Control Control flow chart 2 Compressors 380VAC Double-Head 3P+N+PE Compressor Compressor Thermo relay Thermo relay Miniature Circuit Breaker Compressor Compressor Contactor Contactor Star-Delta Start Star-Delta Start Main base controller Terminal for Terminal for External Signal Output Action...

  • Page 29: Energy Adjustment

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Energy adjustment The unit adjusts capacity by chilled water. The control logic references picture. Energy adjustment is districted when starting high pressure is too high. High pressure unloading 19Bar 18Bar Normal adjusting...

  • Page 30: Start/Stop Process

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Start/stop process 1).Cooling start Power on Detect Clear failure Start on Chilled pump on Cooling pump on Cooling tower on Water flow Stop clear failure switvh Water temp is OK Oil heating time is enough Stand Stop time is enough Compressor 25% SV ON...

  • Page 31: Sensors

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 2).Cooling stop Stop Running time is Stop enough Unload to 50% step Unload to 25% step Compressor OFF Compressor 25% SV OFF Cooling tower off Cooling pump off Chilled pump off Sensors 1).Temperature sensors The temperature sensors that unit users are all NTC thermistors, including chilled leaving water temperature, chilled entering water temperature, discharge temperature, EXV discharge temperature.

  • Page 32: Parts Control

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) temperature thermistors are installed in wells on chilled water inlet/outlet and cooling water inlet/outlet. Refer to the electric control wiring diagram for detailed connection information.  Thermistor replacement To Replace Thermistors RT1, RT2, RT3, RT4, RT5, or RT6 (Entering/Leaving chilled Water; Entering/Leaving cooling Water;...
  • Page 33 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 it exceeds 5hrs, 2hrs heating time is needed.  When cooling water inlet temperature ≥ 20° C (real time value), oil heating time for first startup is 4hrs. If power down happens when the unit is running and downtime is less than 1hrs, no heating time delay is needed when unit restarts.
  • Page 34 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) a. When compressor starts, the return oil solenoid valve is open, and it will close after 10 minutes. b. When compressor is running, from compressor starting at 50%, every 30 minutes open for return oil solenoid valve for 2 minutes.
  • Page 35 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Display suction superheat Display EXV opening Relay output status Alarm Start of the protection Control state Remove cover Change display Display Button Function Open the display screen, and enter the password to enter programming mode •...
  • Page 36 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Running display status display all status Press Press button c. Controller parameter checking and changing. Checking or changing repair parameters step: ①Press one or more Esc to switch to the standard display interface; ②Press Prg: Display the interface input password;...
  • Page 37 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Drive hardware configuration 4/13 Drive hardware configuration 3/13 Type of probe S1 Type of probe S1 NTC Carel User-defined Auxiliary control type Unit type Disabled Fin coil evaporator air-conditioner Drive hardware configuration 5/13 Drive hardware configuration 6/13...
  • Page 38 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) ⑤Press UP/DOWN button to select the category, and then press ENTER to enter the first number ⑥Press UP/DOWN to select parameters to set, and then press ENTER to move to the parameter value; ⑦Press UP/DOWN to modify the parameter value;...
  • Page 39 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Number of steps for valve closing 3970 Valve rate Low SH protection: threshold Low SH protection: integration time LOP protection: threshold LOP protection: integration time MOP protection: threshold MOP protection: integration time Low overheat degree alarm delay (Low SH, 0 = no alarm) Low evaporation temperature alarm...

  • Page 40: Operation Part

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Operation part 6.1 Unit operation flow chart Welcome page Note: use the user password (58806) or administrator password (40828) to enter the white window Main page Use the administrator password (40828) to enter the purple window.
  • Page 41 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 6.2 Operation part The control system adopts touch screen for all operations. Take the unit with dual compressors and step control as an example. The actual display of different products may have a little difference, but the operations are basically the same.
  • Page 42 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Refers to the table below for the current status display and explanation of the unit: Standby Machine is not operating, it can start normally. Machine has malfunction and it cannot start. Please check from malfunction query page and Malfunction confirm if the malfunction has been solved.
  • Page 43 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 ② The control mode is used as an on/off mode choice. "Local” control mode can only be realized through the touch screen "on / off" button; "Remote” control mode can only be realized through the "remote start / remote stop"...
  • Page 44 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Figure 6.5 Startup operation: Press “startup” is not valid if unit is in malfunction state. Press START button, and confirm in the window, then unit can start. If the compressor startup conditions are not met, the unit will pause after running the water pump. The interface display "compressor start conditions are not satisfied, please check state information".
  • Page 45 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 control range. When unit is in paused state, if temperature controlling is lower than compressor starting temperature, compressor starts.  Status information- operation query Press status in the figure 6.5 and enter figure 6.6. Displaying the unit without oil temperature sensor Displaying the unit with oil temperature sensor Figure 6.6...
  • Page 46 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) ⑩ Display if the minimum operation time is satisfied, when compressor stops, “Min. Running Time Elapsed” must be ‘YES’. Note: when the compressor has oil temperature sensor, the oil temperature conditions must be satisfied so the compressor can start.
  • Page 47 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Figure 6.8 (Remark: subject to the actual principle diagrams) “Remote start/stop” displays the status of remote start or remote stop. User needs to install the ① point contact type control switch. ② “Chilling/Chilled water flow switch” outputs is OFF if water does not flow. If it does, it outputs ON. ③...
  • Page 48 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Figure 6.10 Dialog box like figure 6.11 appears if user inputs wrong password. Press Confirm to return to the input interface, then input password again. Figure 6.11  User parameter setting-temperature setting Input the password （40828）and enter the page as figure 6.12 shows below: Manual input is...
  • Page 49 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 ① The temperature adjustment cycle represents each execution cycle of the judgment of load or unload. If it is set to be 60s, then system judges the unit temperature and checks if it needs to load or unload every 60 seconds.
  • Page 50 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) appear. Press adjust Figure 6.14 3) User parameter setting- Automatic On/Off If user wants to use timer function for start or shutdown, choose “timer” in control mode of the figure 2 and enter user setting. Press AUTOMATIC ON/OFF and enter figure 6.15 as below: Manual input is possible...
  • Page 51 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1  Alarm window Press Alarm button in the main page to enter real-time alarm window, as figure 6.16 shows. Figure 6.16 If an alarm occurs, the unit executes response according to the fault program. After fault recovery, press the “reset”...
  • Page 52 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Figure 6.17 Please refer to the actual operation interface. It is subject to change without notice.

  • Page 53: Safety Protection

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Safety protection Name Code Brand Setting Range Location ON 0.10Mpa Low-pressure YK-0.3/0.20- JUNLE OFF 0.20Mpa Switch O-R-7000 ON 1.4Mpa High-pressure YK-1.4/0.9-C- JUNLE OFF 0.9Mpa Switch 1 R-7000 Note: Manual reset is needed for high-pressure switch. Safety Devices ...
  • Page 54 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC)  High/low pressure switch All compressors have factory-installed high/low-pressure switches. See Table.6.1 Table – High/low-pressure switch settings High-pressure switch setting Low pressure switch setting UNIT Protection value Reset Value Protection value Reset Value LSBLG /MCF 14bar...

  • Page 55: Electrical Control

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 IV. Electrical control Electrical data LSBLGW /MCF 1055 1200 1300 1410 1620 1780 Power supply 380V 3Ph 50Hz Voltage range 340~420 Max. running current Max. power consumption Rated current Compressor A Locked rotor Amps. 1340 1990 2260...

  • Page 56: Electrical Components

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Electrical components 1) Power protector This module detects power supply and protects if phase loss, phase sequence, and under voltage of incoming line power, occurs. It prevents damage to the compressor or other components if there is a power failure.

  • Page 57: Electrical Parts Parameter Setting

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 The electronic expansion valve is equipped with a stepping motor which controls the valve status. A special-purpose electronic expansion valve control module is required to drive the electronic expansion valve. 6) Solenoid Valve When the solenoid valve is energized, the electromagnetic coil generates electromagnetic force to pull up the closed component from the valve seat and open the valve.
  • Page 58 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Time’s up LED Up display green Power LED On display red T： 6S Time relay use Omron H3Y type. 3) Compressor and fan thermal overload relay Thermal overload relay takes advantage of heating effect to protect the compressor and fans. TEST key: to press to test whether the overload relay is normal in stop condition Reset key: to press to reset the overload...

  • Page 59: Field Wiring

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Field wiring 1) Wiring diagram Power supply wiring diagram...
  • Page 60 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Water Pump Wiring Diagram 3～ Recommended external wiring cable Unit Model External wiring cable (mm Unit Model External wiring cable (mm 4×AWG1+AWG3 4×AWG400+AWG4/0 LSBLG340/MCF LSBLG1055/MCF 4×AWG1/0+AWG3 4×AWG500+AWG250 LSBLG440/MCF LSBLG1200/MCF 4×AWG3/0+AWG1 4×AWG500+AWG300 LSBLG540/MCF LSBLG1300/MCF 4×AWG4/0+AWG1/0 4×AWG600+AWG300...
  • Page 61 Remote start/stop switch needs to use inching switch. Lamp input 220VAC. 3) PC connection Nowadays PC system (such as BMS) is becoming more and more popular. Midea water-cooled screw chiller has reserved a RS485 interface using the MODBUS protocol. (1) PLC units PC connection...

  • Page 62: Wiring Diagrams

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Wiring Diagrams LSBLG340~1055/MCF L1 L2 L3 1/G2 2/F2 12 11 14 2/B9 2/B9 ～ X:23 24V 0V 220V +V -V X:24 RS485 Communication Line JTX-A 3/F2 3～ N S1 S2 M1 M2 1/G2 2/F2...
  • Page 63 Flooded type water cooled screw chiller(MIC) MCAC-CTSM-2018-1 X:39 X:13 X:14 X:42 X:45 X:47 SP2 SP1 X:40 X:12 X:15 X:41 X:43 X:44 X:46 X:48 206 208 218 220 309 311 313 315 X:27 X:31 X:33 X:35 X:5 YV3 YV2 YV1 X:28 X:32 X:34 3/E2 3/A5...
  • Page 64 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) ～ 220V X:50 X:51 X:54 X:55 X:58 X:62 X:17 X:18 X:20 +V -V X:49 X:52 X:53 X:56 X:57 X:61 X:16 X:19 X:21 230 234 402 404 406 410 404 317 319 X:8 X:9 X:10 2/F11 2/F11...
  • Page 65 Flooded type water cooled screw chiller(MIC) MCAC-CTSM-2018-1 1/C12 1/F12 613 615 605 603 601 607 X:69 X:68 X:67 X:70 BP P...
  • Page 66 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) LSBLG1200~1780/MCF L1 L2 L3 12 11 14 1/G2 1/G4 2/B2 1TA1 1TA2 2TA2 2TA1 3/B9 3/B9 1KM1 2KM1 ～ 220V +V -V X:29 X:32 24V 0V 1KM1 1KM2 2KM1 2KM2 RS485 Communication Line 4/F2 X:30 X:31...
  • Page 67 Flooded type water cooled screw chiller(MIC) MCAC-CTSM-2018-1 1/C11 3/F2 4/A5 5/B1 1KM3 1KM2 2KM3 2KM2 1KM3 1KM1 2KM3 2KM1 1KM2 2KM2 1KM1 1KM2 1KM3 2KM1 2KM2 2KM3 1/E11 3/F2 4/A5 5/B1...
  • Page 68 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) X:53 X:18 X:19 X:56 X:59 X:62 X:65 1SP2 1SP1 2SP2 2SP1 X:64 X:52 X:54 X:17 X:20 X:55 X:57 X:58 X:60 X:61 X:63 X:66 208 210 224 226 228 230 309 311 313 323 325 327 329 X:35 X:37...
  • Page 69 Flooded type water cooled screw chiller(MIC) MCAC-CTSM-2018-1 ～ X:22 X:23 X:25 X:67 220V X:78 X:82 X:83 X:70 X:71 X:74 X:75 X:79 +V -V X:21 X:24 X:68 X:69 X:72 X:73 X:76 X:77 X:80 X:81 X:84 X:26 240 248 402 404 406 410 404 331 333 X:12 X:13...
  • Page 70 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) 2/B12 2/E12 613 615 631 633 2EVD 1EVD 605 603 601 607 623 621 619 625 X:95 X:94 X:93 X:96 X:103 X:102 X:101 X:104 2BP P...

  • Page 71: Installation

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 V. Installation Safety considerations Only authorized personnel should maintain the unit. The access limitation device must be installed by the customer. After the unit has been received, when it is ready to be installed or reinstalled, and before it starts up, it must be inspected for damage.
  • Page 72 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) 2) Foundation ① Consider the construction of installation foundation. Attention should be especially paid to the intensity of the floor and noise elimination when installing the unit in interlayer or on the top floor. It is suggested to consult the building designer before installation.
  • Page 73 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Foundation Bolt Installation Dimension Table LSBLG***/MCF Model 1055 1200 1300 1410 1620 1780 Dimension 2850 2850 2850 2850 2850 2850 2850 3850 3850 3850 3850 3850 D(mm) 1100 1100 1100 1300 1300 1300 1400 1400...

  • Page 74: Water Pipeline System Installation

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Note: (1) Pads must extend the full length of the saddle when an isolation pad is used. (2) Level the unit to within 5mm of its length and width after absorbers are installed. 4).Spaces Ensure sufficient space for maintenance: ...
  • Page 75 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 the water by mixing it with an inert gas as it will over-oxygenate it by mixing it with pure oxygen. Altering oxygenation conditions destabilizes copper hydroxides and enlarges particles. 10. Specific resistance – electric conductivity: Higher specific resistance, shows corrosion. Conductivity <20μV/cm (25℃) is desirable.
  • Page 76 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Condenser side 0.969 1.023 1.01 1.227 0.959 1.029 1.028 1.276 0.944 1.039 1.05 1.329 0.923 1.054 1.078 1.388 0.896 1.078 1.116 1.453 Note: the freezing point is not shown here. Please calculate it according to the interpolation method.
  • Page 77 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 3).Design of the store tank in the system a. kW is the unit for cooling capacity, L is the unit for (G) minimum water flow volume in the formula. Comfortable type air conditioner G= cooling capacity×2.6L Process type cooling G= cooling capacity×7.4L...
  • Page 78 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) a Flexible connection k Flow switch c Butterfly valve d Pressure gauge e Thermometer f Platinum resistance thermometer g Air vent h Water pump I Drain valve j Y- shape strainer Note: All water pipe accessories and flow switches must be provided by user. Chilled water piping: suggested piping as follows：...
  • Page 79 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 The flow switch must be arranged on the drain pipe of the evaporator. The flow switch must be interlocked with the input contact in the control cabinet. Its installation requirements are as follows: (1) The flow switch must be installed on the pipe vertically.
  • Page 80 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) system. 13) The drain connection is arranged on the evaporator cylinder. The drain outlet has been equipped with a 1/2’’ plug. 14) To expel the air from water system, install an automatic discharge valve at the highest point of local water pipe and the horizontal pipe should be tilted up for about 1/250 degrees.

  • Page 81: Wiring Installation

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 actual operating current is satisfactory. 24) Inspect whether the water replenishing device for the expansion tank is smooth, and that the auto discharge air valve in the water system enables auto discharge. If the discharge air valve is a manual type, open the discharge valve of the chilled water pipeline to discharge all air in the pipeline.
  • Page 82 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Attentions: Connect the wires strictly according to the wiring terminal diagram. Use three-core shield cable (3×0.75mm ) to connect to the temperature sensor. Use common two-core cable (2×0.75mm ) to connect the flow switch to connect to the NO contact of the switch, i.e. the opening point when waterless. Two buttons can be connected to the external remote start and stop.

  • Page 83: Commissioning

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 VI. Commissioning Pre start-up (1) Electrical System Inspection 1) Inspect whether power distribution capacity complies with the power of the unit before the first start-up, and whether the diameter of the selected cable can bear the maximum working current of the master compressor.
  • Page 84 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) 9) Before starting up the machine, inspect whether the external system of the unit meets the conditions for start-up (e.g. whether the water cooling pump of the system is externally controlled or interlocked with the master compressor, and whether the water pump must be started before starting up the master compressor via external control).
  • Page 85 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 be full of oil. The oil must be full in stop status of the unit, and above the 1/2 position in stable operation. When the unit is running stably, the oil level in the high oil immersion lens should be at least above the 1/2 position.
  • Page 86 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) cabinet, and whether the values of all temperature sensors are normal. During shutdown, the indicated temperatures for discharge, fin, and the environment must be almost the same, and the entering and leaving chilled water temperatures shall be almost the same. 10) Before the unit leaves the factory, the control cabinet is pre-connected with main motor, electrical actuator, and sensor elements of pressure temperature, so wiring on site is very simple.

  • Page 87: Start-Up

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Start-up Before starting the unit, the following performance parameters need to be inspected: (1) High/low voltage value of the system. If the unit will be shut down and waterless for a long time, the liquid and gas of the system must be equivalent and close to the saturation pressure corresponding to the current ambient temperature.
  • Page 88 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Compressor oil heater begins to work when the unit is electrified. (3) Inspect whether there is an alarm on the display screen. If there is, correct the fault. (4) Inspect the electronic expansion valve control module for alarms. (5) Inspect whether the temperature points displayed on the screen are within the normal range.

  • Page 89: Vii.maintenance

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 VII.Maintenance ATTENTION: All installation parts must be maintained by personnel in charge, to avoid material deterioration and injuries to people. Faults and leaks must be repaired immediately. Authorized technician must repair faults immediately. Each time repairs have been carried out on the unit, the safety devices must be re-checked.
  • Page 90 6. Remove the condenser heads at least once a year to inspect the condenser tubes and clean if required. Recommended maintenance schedule This chapter describes the preventive maintenance of Midea screw chiller. Correct maintenance and timely service will keep the chiller in the best condition and give the best performance, and prolong its service life.
  • Page 91 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 operation. It’s good for finding and forecasting the problem that may occur and taking measures in time. For example, by analyzing the record of a whole month, you may find that the temperature difference between the condensing temperature and leaving cooling water temperature may become bigger.
  • Page 92 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) see whether there is corrosion, rust, scaling, leakage phenomenon internal (if necessary, replace the safety valve). Check the other valves to see whether they open and close smoothly. ▲ High/low pressure switch Check whether they are in good condition according to “performance of protection device”, every month and change broken ones in time.

  • Page 93: Maintenance

    2. Maintenance If the problem is serious, contact your local Midea office or your local representative for assistance. Cleaning Heat Exchangers Check the chiller tightness and whether there’s leak in the heat exchange tubes. It is necessary to do nondestructive inspection for the principal weld (longitudinal and circumferential weld of evaporator/condenser barrel) of the pressure vessel.
  • Page 94 1/3 of rated value. The volume of cooling tower flume should keep at the rated value if cleaning is performed when the unit is running. Midea assumes no responsibility for pressure vessel damage resulting from untreated or improperly treated water.
  • Page 95 Atmospheric air contains contaminants that increase the need for proper water treatment. The use of untreated water can result in corrosion, erosion, sliming, scaling or algae formation. Midea assumes no responsibility for the results of untreated or improperly treated water. See appendix 1 for water quality requirements.
  • Page 96 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) manual book). Leak testing must be done under sufficient pressure. Charge enough refrigerant into the system to build the pressure up to approximately 70 kPa and add sufficient dry nitrogen to bring the pressure up to a maximum of 850 kPa.
  • Page 97 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 the valve to the mid-position. Turn on both the cooling tower water pump and chilled water pump and allow water to circulate through the condenser and the chiller. IMPORTANT: When adding refrigerant to the unit, circulate water through the evaporator continuously to prevent freezing and possible damage to the evaporator.
  • Page 98 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) Fig. 34. Each screw compressor is connected to a tank (oil separator) that separates and collects the oil from the discharge gas. The discharge gas pressure pushes the oil back into the compressor for compressor seal and lubrication of all moving parts.
  • Page 99 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 1. Change oil periodically: Check the lubrication oil after every 10,000 hours of continuous running. When the compressor first runs, change the oil and clean the oil filter after running for 2,000 hours. Check whether the system is clean and change the oil every 20,000 hours or after 3 years of continuous running when the system has been running normally.

  • Page 100: Viii.troubleshooting

    VIII.Troubleshooting 1. Protection items Midea screw chiller has many protection measures and devices. There’re many features to aid in troubleshooting. By using the alarm information, DI/O, AI/O and operating conditions of the chiller during chiller operation, it’s convenient to find the possible problem. Verify that the chiller is properly configured, including options and/or accessories.
  • Page 101 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 If chilled water flow fails, chilled water pump stops after 30s delay; cooling water pump and cooling tower stops after 60s delay. If cooling water flow fails, the cooling water pump and cooling tower stops after a 60s delay; the chilled water pump stops after 600s delay.
  • Page 102 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) red reset button when a fault happens. Faults on screen must be confirmed and cleared manually; when both temperature and time conditions are satisfied, the chiller can restart. When suction pressure is lower than the protective low pressure set point (effective for a time delay), the system will stop according to the abnormal shutdown program.

  • Page 103: Troubleshooting

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 2. Troubleshooting Alarm Trouble Description Action Reset Type Possible Cause Compressor cannot work. The Power Failure Phase sequence relay Reset it manually on the touch The power quality is poor due to phase inversion, compressor stop running Protection switches OFF...
  • Page 104 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) 1,The cooling water quality is poor and the heat exchange of condenser is abnormal 2,There is too much non-condensable gas in the The compressor for protection Press the red reset button, and system High-pressure High pressure switch OFF...
  • Page 105 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 1,The superheat is too high( the refrigerant is not enough, EXV fails) The protection is relieved once 2,The discharge pressure is too high The compressor discharge The compressor for protection the discharge temperature is 3,The oil level is too low and the oil volume in the High Discharge temperature is greater than...

  • Page 106: Ix.appendix

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) IX.Appendix 1. Temperature-Resistance specifications sheet for the discharge temperature sensor NTC sensor characteristic sheet Unit：Temp:℃--K.Ratio:KΩ，5K@90℃ Temp. Ratio Temp. Ratio Temp. Ratio Temp. Ratio 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492 455.9...

  • Page 107: Temperature-Resistance Specifications Sheet For The Water Temperature Sensor, Ambient

    Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 2. Temperature-Resistance specifications sheet for the water temperature sensor, ambient temperature sensor, oil temperature sensor. Unit：Temp:℃--K . Ratio:KΩ，10K@25℃ NTC sensor specifications sheet Temp. Ratio Temp. Ratio Temp. Ratio Temp. Ratio 103.882 12.598 2.383 0.623 97.868...

  • Page 108: Temperature-Resistance Specifications Sheet For The Exv Temp. Sensor

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) 3. Temperature-Resistance specifications sheet for the EXV temp. sensor. Unit：Temp:℃--K. Ratio:KΩ10K@25℃ NTC Sensor specifications sheet Temp. Ratio Temp. Ratio Temp. Ratio Temp. Ratio 67.74 12.09 3.02 0.97 64.54 11.63 2.92 0.94 61.52 11.20 2.83 0.92...
  • Page 109 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 Temperature-Resistance specifications sheet for the EXV temp. sensor. Unit：Temp:℃--K. Ratio: KΩ 50K@25℃ NTC Sensor specifications sheet Temp. Ratio Temp. Ratio Temp. Ratio Temp. Ratio 1630,77 1178,11 860,97 636,08 474,78 357,83 272,18 208,83 161,56 125,97 98,96...

  • Page 110: Sample Selection Sheet

    MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) 4. Sample selection sheet Part 1 — General 1.01 SYSTEM DESCRIPTION Microprocessor-controlled liquid chiller shall use a semi-hermetic Screw compressor using refrigerant HFC-134a. 1.02 QUALITY ASSURANCE A. Chiller performance shall be rated in accordance with AHRI Standard 550/590, latest edition. B.
  • Page 111 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 b. Refrigerant-cooled oil cooler. Water-cooled oil coolers are not acceptable. c. Oil pressure regulator. d. Oil filter with isolation valves to allow filter change without removal of refrigerant charge. e. Oil sump heater controlled from unit microprocessor. Oil reservoir temperature sensor with main control center digital readout.
  • Page 112 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) c. VFD Rating: 1) Drive shall be suitable for nameplate voltage ±10%. 2) Drive shall be suitable for continuous operation at 100% of nameplate amps and 150% of nameplate amps for 3 seconds. 3) Drive shall comply with applicable UL, CE, and NEMA standards.
  • Page 113 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 a. Waterbox shall have standard victaulic grooves. Unit manufacturer shall insulate the cooler shell, compressor suction elbow, motor shell and motor cooling lines. Insulation shall be in. (19 mm) thick with a thermal conductivity not F [(0.0404 •...
  • Page 114 MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC) 7) control point settings 8) discrete output status of various devices 9) compressor motor starter status 10) optional spare input channels 11) current and voltage for each phase 12) frequency g. Schedule Function: The chiller controls shall be configurable for manual or automatic start-up and shutdown.
  • Page 115 Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1 loss of cooler water flow loss of condenser water flow starter fault The control system shall detect conditions that approach protective limits and take self-corrective action prior to an alarm occurring. The system shall automatically reduce chiller capacity when any of the following parameters are outside their normal operating range: 1) high condenser pressure 2) high motor temperature...
  • Page 116 Commercial Air Conditioner Division Midea Group Address: Midea Headquarters Building, 6 Midea Avenue, Beijiao, Shunde, Foshan, Guangdong, China Midea CAC After-service Application Postal code: 528311 Tel: +86-757-26338346 Fax: +86-757-22390205 cac.midea.com global.midea.com Note: The data in this book may be changed without notice for further improvement on quality and performance.

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