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Midea AirBoost SCAF Series Installation, Operation And Maintenance Manual
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Midea AirBoost SCAF Series Installation, Operation And Maintenance Manual

Midea AirBoost SCAF Series Installation, Operation And Maintenance Manual

Air cooled screw chiller
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AirBoost Air Cooled Screw Chiller
Installation, Operation and Maintenance Manual
Inverter, SCAF***
Please keep this manual carefully for future reference
Please keep this manual carefully for future reference
and read it carefully before operation
and read it carefully before operation

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Summary of Contents for Midea AirBoost SCAF Series

  • Page 1 AirBoost Air Cooled Screw Chiller Installation, Operation and Maintenance Manual Inverter, SCAF*** Please keep this manual carefully for future reference Please keep this manual carefully for future reference and read it carefully before operation and read it carefully before operation...
  • Page 3 Description  The installation section in this manual is provided only for professional installation personnel.  Before using the unit, carefully read the "Unit and Controller Operating Instructions" to avoid damaging the unit and causing accidents due to incorrect operation. ...

  • Page 4: Table Of Contents

    Contents 1 Introduction ································ 3 1.1 Functions········································ 3 1.2 Main Parts ······································· 3 2 Operating Range ······························ 6 2.1 Installation Environment ································· 6 2.2 Water-side Pressure Drop of Shell-and-tube Heat Exchanger ················· 6 2.3 Variable Flow of Shell-and-tube Heat Exchanger ······················· 6 3 Dimensions ································...
  • Page 5 5.1 Water System Installation Requirements ························· 34 5.2 Recommended Water System ······························ 37 5.3 Water Treatment Requirements ····························· 37 6 Electrical Installation ···························· 39 6.1 General Requirements for Electrical Operation ······················ 39 6.2 General Requirements for Power Supply and Environment ················· 40 6.3 General Grounding Requirements ····························...

  • Page 6: Introduction

    Midea inverter air cooled screw chiller can operate at a wide temperature range. The standard type can operate in full load at the ambient temperature of 48⁰C and the water outlet temperature of 7⁰C. The lowest operating temperature can be up to 5⁰C.
  • Page 7 1 Introduction  The chiller adopts the advanced inverter 5-toothed and 6-toothed asymmetrical spiral twin-rotor screw compressor, which is specifically designed for the inverter technology. It features high-precision male and female rotors, which are well matched and designed to work together, minimizing the friction resistance and ensuring that the unit has quiet and long-lasting operation.
  • Page 8 1.2.5 Liquid Ejector System Midea inverter air cooled screw chiller can effectively monitor the compressor motor temperature. The standard liquid ejector system located at the rear of the compressor is able to cool down the motor, so as to control the compressor discharge temperature, to prevent the motor or lubricating oil overheating.

  • Page 9: Operating Range

    2 Operating Range 2 Operating Range 2.1 Installation Environment Refer to the following to select an appropriate model. High Standard type temperature temperature Direct free Indirect free (T1) type type cooling (FCD) cooling (FCI) (LA) (T3) Ambient 5⁰C~48⁰C -20⁰C~48⁰C 5⁰C~52⁰C -25⁰C~48⁰C -25⁰C~48⁰C temperature...
  • Page 10 2 Operating Range The minimum water capacity of the water circulation system is derived from the following formula: Volume = Q (kW) * N (L) Type N (L) Air conditioning conditions Process conditions Q (kW): Nominal cooling capacity under standard operating conditions. To facilitate proper operation of the unit and achieve precise control, it is usually necessary to add a tank to ensure the required water capacity is met.

  • Page 11: Dimensions

    3 Dimensions 3 Dimensions 3.1 Dimensions of SCAF80~145HV, SCAF80~145HV(T3), SCAF80~145HV(LA) ① Chilled water outlet ② Chilled water inlet ③ Control panel ④ VFD ⑤ Power incoming line Dimensions (unit: mm) Model 80~120 4440 2300 2460 125~145 5240 2300 2460 Foundation of SCAF80~145HV, SCAF80~145HV(T3), SCAF80~145HV(LA) 6-φ14 ⑥...

  • Page 12: Dimensions Of Scaf150~175Hv, Scaf150~175Hv(T3), Scaf150~175Hv(La)

    3 Dimensions Models of spring isolators at all points Model 80~120 MHD-850 MHD-850 MHD-850 125~145 MHD-1050 MHD-1050 MHD-1050 Notes: 1. The spring isolator is optional. 2. The value in the spring isolator model indicates bearable weight (unit: kg); for example, "1050" in "MHD-1050"...

  • Page 13: Dimensions Of Scaf185~205Hv, Scaf185~205Hv(T3), Scaf185~205Hv(La)

    3 Dimensions Dimensions (unit: mm) Model 150~175 6245 2300 2180 1080 2000 1200 1200 Models of spring isolators at all points Model 150~175 MHD-850 MHD-850 MHD-850 MHD-850 Notes: 1. The spring isolator is optional. 2. The value in the spring isolator model indicates bearable weight (unit: kg); for example, "1050" in "MHD-1050"...

  • Page 14: Dimensions Of Scaf215~255Hv, Scaf215~255Hv(T3), Scaf215~255Hv(La)

    3 Dimensions ⑥ Installation foundation ⑦ Spring isolator installation hole ⑧ Electric control box Dimensions (unit: mm) Model 185~205 7250 2300 2180 1800 1800 1050 1200 Models of spring isolators at all points Model 185~205 MHD-850 MHD-850 MHD-850 MHD-850 MHD-850 Notes: 1.

  • Page 15: Dimensions Of Scaf265~275Hv, Scaf265~275Hv(T3), Scaf265~275Hv(La)

    3 Dimensions Dimensions (unit: mm) Model 215~255 8255 2300 2180 1200 1800 1800 1050 1200 Models of spring isolators at all points Model 215~255 MHD-850 MHD-850 MHD-850 MHD-850 MHD-850 MHD-850 Notes: 1. The spring isolator is optional. 2. The value in the spring isolator model indicates bearable weight (unit: kg); for example, "1050" in "MHD-1050"...

  • Page 16: Dimensions Of Scaf285~295Hv, Scaf285~295Hv(T3), Scaf285~295Hv(La)

    3 Dimensions 12-φ14 ⑥ Installation foundation ⑦ Spring isolator installation hole ⑧ Electric control box Dimensions (unit: mm) Model 265~275 9260 2300 2180 1800 1800 1800 1050 1200 Models of spring isolators at all points Model 265~275 MHD-850 MHD-850 MHD-850 MHD-850 MHD-850 MHD-850...

  • Page 17: Dimensions Of Scaf310~340Hv, Scaf310~340Hv(T3), Scaf310~340Hv(La)

    3 Dimensions 12-φ14 ⑥ Installation foundation ⑦ Spring isolator installation hole ⑧ Electric control box Dimensions (unit: mm) Model 285~295 9260 2300 2180 1500 2000 2000 1200 1200 Models of spring isolators at all points Model 285~295 MHD-1050 MHD-1050 MHD-1050 MHD-1050 MHD-1050 MHD-1050...

  • Page 18: Dimensions Of Scaf350~410Hv, Scaf350~410Hv(T3), Scaf350~410Hv(La)

    3 Dimensions 12-φ14 ⑥ Installation foundation ⑦ Spring isolator installation hole ⑧ Electric control box Dimensions (unit: mm) Model 310~340 10265 2300 2180 1100 2000 2000 2000 1200 1200 Models of spring isolators at all points Model 310~340 MHD-1050 MHD-1050 MHD-1050 MHD-1050 MHD-1050...

  • Page 19: Dimensions Of Scaf420~450Hv, Scaf420~450Hv(T3), Scaf420~450Hv(La)

    3 Dimensions 14-φ14 ⑥ Installation foundation ⑦ Spring isolator installation hole ⑧ Electric control box Dimensions (unit: mm) Model 350~410 11270 2300 2180 1700 2000 2000 2000 1200 1200 Models of spring isolators at all points Model MHD- MHD- MHD- MHD- 350~410 MHD-1050...

  • Page 20: Dimensions Of Scaf110Hv(Fcd)

    3 Dimensions 14-φ14 ⑥ Installation foundation ⑦ Spring isolator installation hole ⑧ Electric control box Dimensions (unit: mm) Model 420~450 11855 2300 2180 1700 2000 2000 2000 1200 1200 Models of spring isolators at all points Model MHD- MHD- 420~450 MHD-1050 MHD-1050 MHD-1050...
  • Page 21 3 Dimensions Dimensions (unit: mm) Model 110HV(FCD) 5740 2300 2460 4378 Foundation of SCAF110HV(FCD) 6-φ14 ⑥ Installation foundation ⑦ Spring isolator installation hole ⑧ Electric control box Dimensions (unit: mm) Model 110HV(FCD) 5740 2300 2180 1263 2317 1200 Models of spring isolators at all points Model 110HV(FCD) MHD-1050...

  • Page 22: Dimensions Of Scaf130Hv(Fcd)

    3 Dimensions 3.11 Dimensions of SCAF130HV(FCD) ① Chilled water outlet ② Chilled water inlet ③ Control panel ④ VFD ⑤ Power incoming line Dimensions (unit: mm) Model 130HV(FCD) 5540 2300 2460 5170 Foundation of SCAF130HV(FCD) 6-φ14 ⑥ Installation foundation ⑦ Spring isolator installation hole ⑧...

  • Page 23: Dimensions Of Scaf165Hv(Fcd)

    3 Dimensions Notes: 1. The spring isolator is optional. 2. The value in the spring isolator model indicates bearable weight (unit: kg); for example, "1050" in "MHD-1050" indicates 1,050 kg. 3.12 Dimensions of SCAF165HV(FCD) ① Chilled water outlet ② Chilled water inlet ③...

  • Page 24: Dimensions Of Scaf195Hv(Fcd)

    3 Dimensions Dimensions (unit: mm) Model 165HV(FCD) 6545 2300 2180 1385 2000 1200 1200 Models of spring isolators at all points Model 165HV(FCD) MHD-1050 MHD-1050 MHD-1050 MHD-1050 Notes: 1. The spring isolator is optional. 2. The value in the spring isolator model indicates bearable weight (unit: kg); for example, "1050" in "MHD-1050"...

  • Page 25: Dimensions Of Scaf225Hv(Fcd)

    3 Dimensions ⑥ Installation foundation ⑦ Spring isolator installation hole ⑧ Electric control box Dimensions (unit: mm) Model 195HV(FCD) 7650 2300 2180 1880 1800 1050 1200 Models of spring isolators at all points Model 195HV(FCD) MHD-850 MHD-1050 MHD-1050 MHD-1050 MHD-1050 Notes: 1.

  • Page 26: Dimensions Of Scaf260Hv(Fcd)

    3 Dimensions Dimensions (unit: mm) Model 225HV(FCD) 8655 2300 2180 1200 1800 1800 1050 1200 Models of spring isolators at all points Model 225HV(FCD) MHD-850 MHD-850 MHD-850 MHD-850 MHD-850 MHD-850 Notes: 1. The spring isolator is optional. 2. The value in the spring isolator model indicates bearable weight (unit: kg); for example, "1050" in "MHD-1050"...

  • Page 27: Dimensions Of Scaf310Hv(Fcd)

    3 Dimensions Dimensions (unit: mm) Model 260HV(FCD) 9660 2300 2180 1150 1800 1800 1800 1050 1200 Models of spring isolators at all points Model 260HV(FCD) MHD-1050 MHD-1050 MHD-1050 MHD-1050 MHD-1050 MHD-1050 Notes: 1. The spring isolator is optional. 2. The value in the spring isolator model indicates bearable weight (unit: kg); for example, "1050" in "MHD-1050"...

  • Page 28: Dimensions Of Scaf370Hv(Fcd)

    3 Dimensions Dimensions (unit: mm) Model 310HV(FCD) 10665 2300 2180 2000 2000 2000 1200 1200 Models of spring isolators at all points Model MHD- MHD- MHD- MHD- 310HV(FCD) MHD-1050 MHD-1050 MHD-1050 1050 1050 1050 1050 Notes: 1. The spring isolator is optional. 2.
  • Page 29 3 Dimensions Dimensions (unit: mm) Model 370HV(FCD) 11670 2300 2180 1700 2000 2000 2000 1200 1200 Models of spring isolators at all points Model MHD- MHD- MHD- 370HV(FCD) MHD-1050 MHD-1050 MHD-1050 MHD-1050 1050 1050 1050 Notes: 1. The spring isolator is optional. 2.

  • Page 30: Unit Installation

    Such work can only be performed by qualified installers. Commissioning, operation, and maintenance shall only be carried out by professionals trained and authorized by Midea. Due to the relative pressure inside the unit, electrical components, and the installation position of the unit, be especially careful when performing any operations.
  • Page 31 4 Unit Installation Because the unit requires that there is sufficient fresh air for heat exchange through the air-side heat exchanger, ensure there is enough space provided around and between units. To enable maintenance and repairs, do not store materials around the unit. Note the following points when installing the unit in areas affected by snow.
  • Page 32 4 Unit Installation In monsoon regions where the fin heat exchanger will encounter monsoon conditions, air flow is like the broken line in the following figure because the air speed is higher than the air inlet speed of the fan. a.
  • Page 33 4 Unit Installation If the installation site is limited, multiple units can be installed in the following way and the space between units for overhaul must comply with the following figures: Horizontal placement Vertical placement...

  • Page 34: Foundation Construction Requirements

    4 Unit Installation 4.4 Foundation Construction Requirements To prevent erosion to the unit feet, water needs to be properly drained around the unit. The plane on which the bottom steel plate of the unit is to be installed shall be smooth and flat. The following requirements must be met: 1.

  • Page 35: Installation Requirements

    4 Unit Installation 3. Lift and installation (1) Please select the crane according to the weight of the unit (insurance recommended). (2) Hoisting shall be carried out strictly according to the method shown in the following figure. Use the wire rope to make one circle around the hook, or the wire rope could slide and pose a hazard in the event of weight imbalance.
  • Page 36 4 Unit Installation M12 locking bolt (Figure 1) Washer Unit support M12 adjusting bolt (Figure 2) M12 adjusting bolt (Figure 3) Spring isolator body M12 fixing bolt (Figure 4) Base Unit fixing base Appearance Installation diagram diagram Spring isolator installation diagram Instructions on installing the spring isolators: 1.

  • Page 37: Installing The Water System

    5 Installing the Water System 5 Installing the Water System 5.1 Water System Installation Requirements Installation of the water system must comply with conventional installation criteria to achieve optimal operating efficiency. Ensure that no foreign substances are present in the pipes. All water system pipes used must comply with local rules and regulations for such projects.
  • Page 38 5 Installing the Water System outdoor damp-proofing. Wrap the water system pipeline with thermal insulation cotton that is more than 10 mm thick. If heat insulation measures are incomplete, heat loss may occur and the unit may be damaged by freezing in particularly cold weather. ...
  • Page 39 5 Installing the Water System 2. A stainless steel filter of not less than 40 meshes must be installed on the inlet pipeline of the shell-and- tube heat exchanger. 3. All the water pipelines must be rinsed thoroughly to remove foreign matter before being put into operation.

  • Page 40: Recommended Water System

    5 Installing the Water System 5.2 Recommended Water System 5.3 Water Treatment Requirements Using untreated or improper water may reduce the operating efficiency of the unit and damage the heat exchanger. If scale, corrosion, rust, algae, or stagnation occurs due to improper water use, ask a specialist for help.
  • Page 41 Not found Not found Reference item Ammonium (NH4+) mgNH4+/L <0.2 <1.0 Silicon dioxide mgSiO2/L <30 <50 (SiO2) ! WARNING Midea is not responsible for the corrosion, flushing, or unit performance deterioration caused by untreated water or improper water treatment.

  • Page 42: Electrical Installation

     The personnel who operate and maintain the electrical components of the unit must receive professional training and be authorized by Midea to avoid damage to the unit and injury to the personnel.  Electrical component operators must comply with national/local laws and regulations.

  • Page 43: General Requirements For Power Supply And Environment

    For any repairs, contact the maintenance center.  Only use electrical components from brands and models approved by Midea. Users can apply for installation services or technical support from the manufacturer or authorized distributor.

  • Page 44: General Grounding Requirements

    6 Electrical Installation meet the environmental requirements in the following table. Environmental conditions - operation Temperature Please refer to the “Description” part at the first page of this manual Relative humidity ≤90%, no condensing Altitude ≤ 1000m Pollution degree II (no corrosive gas and conductive dust) Environmental conditions - storage Temperature -25⁰C~55⁰C...

  • Page 45: General Wiring Requirements

    6 Electrical Installation 6.4 General Wiring Requirements ! WARNING Do not check the power supply without proper devices or precautions. Otherwise, it will result in serious injury. Please comply with the provisions of the electricity company. ! WARNING Wiring must be conducted by personnel authorized by the company. Otherwise, it will result in damages.

  • Page 46: Recommended Selection Of Unit Cable

    6 Electrical Installation Implement waterproofing, dustproofing, rat preventing and sealing measures on the wire inlet hole after wiring. 10) Check whether the user's power distribution panel is equipped with circuit breakers and whether the setting parameters are correct. 11) When wiring the power cable, make sure that the clearance between the energized parts and metals (current-passing or non-current-passing) is larger than or equal to 11 mm and the creepage distance is larger than or equal to 16mm.
  • Page 47 6 Electrical Installation SCAF385HV, 2*240 / 2*120/ —— ≤345.9/345.9 465/375.8 1000 SCAF385HV(LA) 2×Kcmil500 Kcmil500 2*120/ SCAF410HV, 2*240 / —— ≤371.3/371.3 488/398.3 Kcmil500 1200 SCAF410HV(LA) 2×Kcmil500 Unit data Recommende Sub- Maximum Cable inlet Ground d capacity of Model modul Startup operating (GB/UL) wire(GB/UL breaker device...

  • Page 48: Water Pump Wiring

    6 Electrical Installation SCAF260HV(FCD 2*150 2*95/ —— ≤518.0 613.3 2×Kcmil300 Kcmil300 SCAF310HV(FCD 2*185 2*95/ —— ≤304.7/304.7 438/337.5 1000 2×Kcmil500 Kcmil500 SCAF370HV(FCD 2*240 / 2*120/ —— ≤373.6/373.6 510/398.3 1000 2×Kcmil500 Kcmil500 Notes:  The above current values (A) are under GB/T18430.1, 380V-3Ph-50Hz. ...

  • Page 49: Unit Wiring

    Take waterproofing, dust proofing, and sealing measures at the power wire inlet hole after wiring. Midea is not liable for any electrical accidents caused by incorrect grounding or user negligence. The power wire...
  • Page 50 6 Electrical Installation PE L3 L2 L1 Customer's inlet line phase sequence Install the protective cover after connection The power wire connection scheme of the two-compressor unit is as shown below:...
  • Page 51 6 Electrical Installation Note: All inputs are passive dry contacts. The output must be switched using an intermediate relay. If the unit will not be used for a long time, turn off the main switch in the panel. When servicing the unit, disconnecting the circuit breaker of the unit and prevent closing accidentally.

  • Page 52: Unit Commissioning

    7 Unit Commissioning (8) Parameters, such as operating current and input power indicated on the unit nameplate, are values tested under standard conditions. These may differ significantly from actual values due to changes in system loads and ambient temperature during actual operations. Therefore, select the power supply, transformer, cable inlet circuit breaker, cabling capacity and other devices based on extreme operating conditions.

  • Page 53: Commissioning Operation Procedure

    7 Unit Commissioning  Check whether the power supply of the unit is consistent with the requirements specified on the nameplate. The voltage fluctuation range shall not exceed ± 10% of the rated voltage and the phase voltage imbalance shall not exceed 2%. The phase sequence of the power supply shall be consistent with that of the unit. ...

  • Page 54: Precautions When The Unit Is Running

    7 Unit Commissioning  Inspect the rotation direction of the fan and its operating current.  Observe whether the oil level is normal and whether the energy-regulating solenoid valve of the compressor is working correctly. (A non-magnetic blade can be used to check whether the solenoid valve is magnetic) ...
  • Page 55 7 Unit Commissioning 7.3.2 Unit Startup Sequence 1. Start the water circulating pump; 2. Start the compressor; 3. Start the fan motor (the fan is turned on according to the discharge saturation temperature when the unit is in cooling mode). 7.3.3 Unit Shutdown Sequence 1.

  • Page 56: Operation Instructions

    8 Operation Instructions 8 Operation Instructions Note: The unit is equipped with the remote service module to realize global positioning and information transmission of the unit. The remote service module is capable of collecting any information but the user's personal information, including the frequency, temperature and pressure when the unit is running.
  • Page 57 8 Operation Instructions 2. Unless otherwise permitted, the implementation of remote control through disassembling of the touch screen and extended communication cables is prohibited, because unit failure may occur due to the signal interference. We assume no liability or responsibility for any damage brought by or results arising thereof. Customers who require remote control can apply to us for a customized configuration.

  • Page 58: Password Interface

    8 Operation Instructions 8.2.3 Password Interface Click the "Enter" button to enter the password input page, as shown in the figure below. Figure 4.2 Password interface Figure 4.3 Password input interface Enter the password 40828, and confirm by tapping ENTER on the keyboard. After that, tap "Login" to enter the main interface.

  • Page 59: Main Interface

    8 Operation Instructions 8.2.4 Main Interface Figure 4.4 Main interface When the unit is not online-controlled, "Stand-alone" is displayed. The online mode is set by "Multi- Connection Set" in the parameter settings (do not set to online mode when there is only one unit). 4.2.4.1 Mode setting Click "MODE"...

  • Page 60: Power-On Operation

    8 Operation Instructions mode are displayed on the main interface. Notes: 1. During operation, you can only switch the control mode and cannot select other modes. 2. The control mode is used for selecting the on/off modes. In the "Locally" mode, you can only click the "ON/OFF"...

  • Page 61: Status Information

    8 Operation Instructions Power-on/off and status description: 1. Standby: The unit accesses the standby state in normal cases after it is powered on. 2. Running: The unit has been started up. 3. Pause: The unit enters the pause status and the compressor stops running if the control water temperature is lower than the pause temperature.
  • Page 62 8 Operation Instructions 3. "Remaining Time/Oil Heating" must be "0". If it is greater than "0", the unit is in the oil heating status. Conditions to be met before shutdown: "Stop Delaying" must be "0". If it is not "0", the delay required for shutdown has not yet concluded. 8.2.5.1 Real-time Data Display Click in Figure 4.8 to enter the Analog real-time data display interface, and the interface...
  • Page 63 1. "Remote Start/Stop" is valid in the "REMOTE" mode. When the remote switch hardware of a jog type or the hold type is selected, you need to contact Midea after-sales department to set the jog type or the hold type.

  • Page 64: Parameter Setting

    8 Operation Instructions Abnormal Normal VFD Prot. Abnormal When VFD is running, abnormal VFD Running When VFD is running, normal Abnormal Intra-Comp. Prot. Swit. Normal Abnormal Oil Level Swit. Normal When fan is running, normal Fan Overload Prot. Swit. When fan is running, abnormal 8.2.5.3 Output Status Display Figure 4.11 Output status "ON"...
  • Page 65 8 Operation Instructions Figure 4.12 User parameters setting interface On the interface, click to access the User Parameters Settings interface, as shown in Figure 4.13. Figure 4.13. User parameters setting Notes: 1. Set the Max of the input window to the upper limit of set parameter and Min to the lower limit of the set parameter.

  • Page 66: System Clock Setting

    8 Operation Instructions 2. Manual defrosting can be effective after 10 minutes of compressor operation. 3. The interface display relevant cooling parameters setting in the Cooling mode and relevant heating parameters setting in the Heating mode. Definitions of Terms: 1. Cooling Target Water Outlet Temp.: target value of water temperature adjustment. 2.
  • Page 67 Note: The date and time must be set in a reasonable manner. For any consequences resulting from an unreasonable date/time setting, Midea does not shoulder any liability. 8.2.8 Serial Port Setting Interface Figure 4.16 Serial port setting...
  • Page 68 8 Operation Instructions instructions. Click Save to save the setting, then the setting takes effect. 8.2.9 Multi-Connection Set Figure 4.17 Multi-Connection Set For the Multi-Control Selection, there are two options available: "Stand-alone" or "Online". The Address can be set as 1-16, where 1# is the only multi-connection master unit. Click “Multi-Control Status”...
  • Page 69 8 Operation Instructions Figure 4.19 Multi-Connection serial system display "Enable", "Backup" and "Priority" can be set separately for each unit in the multi-connection system. The 9- 16# addresses correspond to 1-8# series, which needs to be set according to the actual situation. By querying the n# unit, click "Enter"...

  • Page 70: Alarm Information

    8 Operation Instructions 8.2.10 Alarm Information On the main interface, click to access the alarm query interface. Figure 4.21 Alarm information interface In the event of an alarm, the unit will perform actions according to the fault program. To debug all faults, tap to release the unit fault status.

  • Page 71: Timer Setting

    8 Operation Instructions Figure 4.22 Historical Record information interface Notes: 1. The high pressure protection switch cannot be automatically reset. Users need to find the high pressure switch (installed on the unit) and manually reset the protection switch. 2. The compressor overload protector cannot be automatically reset as well. Find the relevant thermal relay in the electric control panel and manually reset the protector.
  • Page 72 8 Operation Instructions Click to set effective Segment Click to set number the effective date of this paragraph Click to enter the power-on/off time Figure 4.23 Timer on/off Setting Interface (different units may vary) You can set eight timed periods, each of which is to be enabled with the "enable" buttons. indicates that timing is disabled, while indicates that it is enabled.
  • Page 73 8 Operation Instructions are the same, when the set start/stop time arrives, the shutdown priority rule will prevent the unit from starting ② If the unit is in operating mode and the "Timer Off" of the current segment is the same as the " Timer On "...

  • Page 74: Unit Operation Precautions

    3. If any unexpected situation occurs when the compressor starts, stop it using the emergency stop button on the panel. 4. The controller parameters of the EXV cannot be adjusted without the authorization of Midea's after-sales personnel; otherwise, the unit will not operate normally.
  • Page 75 8 Operation Instructions Cloud platform module Inside of electric control panel Customer's upper Customer's upper computer computer • communication port 2 communication port 1 Data collection port of upper computer The default baud rate, data bit, stop bit and parity bit of the customer upper computer communication port 1 are 19200, 8, 1 and N respectively.

  • Page 76: Fault Analysis And Troubleshooting

    9 Fault Analysis and Troubleshooting 9 Fault Analysis and Troubleshooting Fault Possible Cause Solution Multi-connection Communication wire breakage Replace the communication wire. communication Slave unit is not energized Supply power to the slave unit fault The unit control circuit air switch is not Close the air switch closed Nothing on unit...
  • Page 77 9 Fault Analysis and Troubleshooting The capacity adjusting oil supply pipeline or Clean the oil pipeline and capillary capillary tube of the compressor is blocked tube and replace the oil filter Set it according to the factory The set time for the time relay is incorrect parameters Connect the line correctly according Contactor Prot.
  • Page 78 9 Fault Analysis and Troubleshooting Remove debris, and clean the fins The fin is blocked by dirt (stop the unit beforehand) when necessary The connected wire has gotten loose The electrical connection of the (resulting in broken wire); the wire is Temperature temperature sensor is incorrect shorted (resulting in short circuit)
  • Page 79 9 Fault Analysis and Troubleshooting The low pressure switch fails Replace the low pressure switch Refer to “Suction pressure too low” for the fault cause and handling method The amount of charged refrigerant is Check whether there are refrigerant insufficient leaks and add more refrigerant Some unit valves are not opened Open all the valves...

  • Page 80: Daily Use And Maintenance

    10 Daily Use and Maintenance 10 Daily Use and Maintenance 10.1 Overview The installation and routine servicing of air conditioning equipment must be carried out by professional technicians. Preventive maintenance is the best way to keep the unit in top condition: ...
  • Page 81 10 Daily Use and Maintenance Target water outlet °C -5.6 -6 to 15 Set for LA unit temperature Ts (LA) Set gross water °C outlet temperature 4 to 20 When using BMS, this temperature must be set. target value Ts (T1) Set gross water outlet temperature °C...
  • Page 82 For the alarm, full attention must be paid to during use. And contact Midea's after-sales personnel in time for troubleshooting.

  • Page 83: Regular Maintenance

    10 Daily Use and Maintenance (13) For water systems using anti-freezing solution, it is important to note that anti-freezing solution (such as ethylene glycol solution or propylene glycol solution) will react slowly with oxygen, chloride ions and steel in steel pipeline, resulting in acidification of anti-freezing solution and final corrosion of steel and copper pipes.

  • Page 84: Professional Maintenance

     moving or dismantling the unit  operational interruption due to improper maintenance  other faults specified in the warranty Note: Midea does not assume any liabilities for failure of the unit arising from negligence or other improper operations. 10.2 Maintenance Items...

  • Page 85: Torque Of Main Fasteners

    10 Daily Use and Maintenance Maintenance Qualification Benchmark Maintenance Item Remarks Frequency (Handling Method) Air resistance is normal and high Cleanliness Once/month pressure is within the reasonable range User side Anytime Within ±5% of the benchmark water flow Temperature Anytime Within the benchmark Anti-freezing Ensure that the concentration is above...
  • Page 86 10 Daily Use and Maintenance Welded bolt PE, user connecting point (M8) Terminal bolt, AC contactor 9A contactor 95A contactor 115A contactor 150A contactor 185A contactor 225A contactor 265A contactor 300A contactor 400A contactor Grounding cable of the compressor Compressor junction box terminal (M10) Compressor junction box U/V/W/Z/X/Y...

  • Page 87: Electric Control Principle Diagram

    11 Electric Control Principle Diagram 11 Electric Control Principle Diagram SCAF80~120HV...
  • Page 88 11 Electric Control Principle Diagram...
  • Page 89 11 Electric Control Principle Diagram...
  • Page 90 11 Electric Control Principle Diagram...
  • Page 91 11 Electric Control Principle Diagram...
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  • Page 94 11 Electric Control Principle Diagram...

  • Page 95: Scaf125Hv - Scaf275Hv

    11 Electric Control Principle Diagram SCAF125HV - SCAF275HV (only the number of fans and the number of corresponding contactors are different)
  • Page 96 11 Electric Control Principle Diagram...
  • Page 97 11 Electric Control Principle Diagram...
  • Page 98 11 Electric Control Principle Diagram...
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  • Page 100 11 Electric Control Principle Diagram three-way valve close feedback three-way valve open feedback...
  • Page 101 11 Electric Control Principle Diagram...
  • Page 102 11 Electric Control Principle Diagram...
  • Page 103 11 Electric Control Principle Diagram...

  • Page 104: Scaf285Hv- Scaf450Hv

    11 Electric Control Principle Diagram SCAF285HV- SCAF450HV (only the number of fans and the number of corresponding contactors are different)
  • Page 105 11 Electric Control Principle Diagram...
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  • Page 110 11 Electric Control Principle Diagram...
  • Page 111 11 Electric Control Principle Diagram...
  • Page 112 11 Electric Control Principle Diagram three-way valve close feedback three-way valve open feedback...
  • Page 113 11 Electric Control Principle Diagram...
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  • Page 117: Attached Table 1

    Attached Table 1 Attached Table 1 Air cooled screw chiller Hazardous substances Hexavalent Polybrominated Part name Lead Mercury Cadmium Polybrominated chromium diphenyl ether (Pb) (Hg) (Cd) biphenyl (PBB) (Cr(VI)) (PBDE) Compressor and × × × × × × accessories ○ ○...

  • Page 118: Attached Table 2

    Production date Please fill in the following content faithfully and then fax or email to Midea CAC after-sales to arrange commissioning. If onsite conditions are inconsistent with the following information, the customer shall bear the related commissioning labor and travel expenses.
  • Page 119 Attached Table 2 The starter panel has passed the insulation test (high voltage centrifugal Yes [ ] No [ ] chiller) Circulating water system Yes [ ] No [ ] The circulating water pump is the correct model Yes [ ] No [ ] The water capacity of circulating water system meets the requirement _____________________...

  • Page 120: Attached Table 3

    Attached Table 3 Attached Table 3 Daily Inspection Record Table Ambient Inlet water Outlet water Discharge pressure Suction pressure Discharge Suction Date Time temperature (°C) temperature (°C) temperature (°C) (bar) (bar) temperature (°C) temperature (°C) Note: The customer needs to fill in and keep this form properly. It can be copied for use.

  • Page 121: Attached Table 4

    Attached Table 4 Attached Table 4 Inspection Record Table of Key Parts Item Compressor Water side heat exchanger Air side heat exchanger Valves Electric control box Others Frequency Date Inspector Content Date Inspector Content Date Inspector Content Date Inspector Content Date Inspector Content Date...

  • Page 122: Attached Table 5

    Attached Table 5 Attached Table 5 Maintenance Record Fault Description Handling Measures Handling Results Recorded by Note: Fill in this form carefully and store it properly.
  • Page 123 EM20U-A007B 16127200018575 Chongqing Midea-General Refrigeration Equipment Co., Ltd. Add.: No.15, Qiangwei Road, Nan'an District, Chongqing, China Tel: +86-757-26338266 mbt.midea.com tsp.midea.com www.midea-group.com Email: service@midea.com...

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