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Summary of Contents for Midea SCWE M Series
- Page 1 Contents Flooded Water Cooled Screw Chiller Installation, Operation and Maintenance Manual SCWE-M series...
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Page 2: Table Of Contents
Contents Start-up check list for SCWE-M series liquid chillers · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1 1 Introduction ·... - Page 3 9.2 Midea recommendations on heat exchange fluids: · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·...
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Page 4: Start-Up Check List For Scwe-M Series Liquid Chillers
Start-up check list for SCWE-M series liquid chillers Start-up check list for SCWE-M series liquid chillers Preliminary information Job name: Location: Installing contractor: Distributor Unit Model: Compressor Circuit A Circuit B Compressor model: Compressor model: Serial number: Serial number: Motor model: Motor model: Evaporator Model number:... -
Page 5: Unit Start-Up
WARNING: Operation of the chiller with an improper supply voltage or excessive phase imbalance constitutes abuse which will invalidate the Midea warranty. If the phase imbalance exceeds ± 2.5% for voltage, contact your local electricity supply at once and ensure that the chiller is not switched on until corrective measures have been taken. - Page 6 Start-up check list for SCWE-M series liquid chillers Proper loop volume established Proper loop corrosion inhibitor included liters of Proper loop freeze protection included (if required) liters of Piping includes electric heater tape, if exposed to temperatures below 0° C ...
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Page 7: Introduction
If damage is detected upon receipt, immediately file a claim with the shipping company. Midea strongly recommends employing a specialized company to unload the machine. 2. It is compulsory to wear personal protection equipment. Do not remove the skid or the packaging until the unit is in its final position. -
Page 8: Maintenance Safety Considerations
1 Introduction device to show if part of the refrigerant has leaked from the valve. The presence of oil at the outlet orifice is a useful indicator that refrigerant has leaked. Keep this orifice clean to ensure that any leaks are obvious. The calibration of a valve that has leaked is generally lower than its original calibration. -
Page 9: Repair Safety Considerations
1 Introduction At least once a year thoroughly inspect the protection devices (valves). If the machine operates in regularly carry out leak tests and immediately repair any leaks. Ensure regularly that the vibration levels remain acceptable and close to those at the initial unit start-up. Before opening a refrigerant circuit, purge and consult the pressure gauges. - Page 10 1 Introduction Do not siphon refrigerant. Avoid spilling liquid refrigerant on skin or splashing it into the eyes. Use safety goggles. Wash any spills from the skin with soap and water. If liquid refrigerant enters the eyes, immediately and abundantly flush the eyes with water and consult a doctor.
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Page 11: Structure
2 Structure 2 Structure Single compressor unit Water Ａ Ｂ Ｃ Ｄ Ｅ Ｆ Ｇ Ｈ Model Inlet/Outlet SCWE100M 2713 1200 1796 2050 1100 DN150 SCWE130M 2713 1200 1809 2050 1100 DN150 SCWE150M 2713 1200 1809 2050 1100 DN150 SCWE180M 2713 1200 1986... - Page 12 2 Structure Water Ａ Ｂ Ｃ Ｄ Ｅ Ｆ Ｇ Ｈ Model Inlet/Outlet SCWE340M 4650 1500 2290 3850 1400 DN200 SCWE370M 4650 1500 2290 3850 1400 DN200 SCWE400M 4650 1500 2290 3850 1400 DN200 SCWE460M 4650 1600 2390 3850 1500 DN200 SCWE510M 5180...
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Page 13: Major System Components
3.2 Compressor Advanced twin screw compressor Midea screw chiller equipped with the 3rd generation industrial compressor that 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 none-gap matching, which minimizes the friction resistance and clearance lost, guarantees quiet running and good duration. - Page 14 3 Major System Components adopting 5-6 dentiform increase by 10-12% and energy saves by 25%, the rotor also gained British and American patent. The bearing of compressor is from SKF, Sweden, the long lifespan of which ensures screw-type main unit to run continuously more than 50,000 hours.
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Page 15: Pressure Vessels
3 Major System Components The compressor is approved for use with the following lubricant: HBR-B04/BSE170-L for R134a unit The Oil Separator comes from MANN of Germany and has reliable qualification. The oil content can be controlled below 3ppm (the oil content treated by oil-gas separator of common like screw-type air compressor is no less than 8-10ppm). -
Page 16: Operating Life
3 Major System Components Must be made in accordance with the instructions of the original manufacturer. Repair and modification that necessitate permanent assembly (soldering, welding, expanding etc.) must be made using the correct procedures and by qualified operators. An indication of any modification or repair must be shown in the monitoring and maintenance file. 3.3.3 Corrosion allowances: Gas side: 0 mm Heat exchange fluid side: 1 mm for tubular plates in lightly alloyed steels, 0 mm for stainless steel plates or... -
Page 17: Oil Separator
3 Major System Components 3.3.8 Oil separator The oil separator with unique structure separate oil from refrigerant high-efficiently. It is solve the oil recycle problem by ensure oil return to compressor normally. 3.4 Throttle parts The unit achieves high-efficiency when full load and part load by parallel connecting orifice and EXV. -
Page 18: System Diagrams
4 System Diagrams 4 System Diagrams 4.1 Principle The chiller operating principle is: Increase the pressure and temperature of refrigerant vapor by compressor, then process it with condensing, throttling procedures to turn it into refrigerant liquid of low pressure and temperature;... -
Page 19: Single Compressor Unit
4 System Diagrams 4.2 Single compressor unit... -
Page 20: Dual Compressor Unit
4 System Diagrams 4.3 Dual compressor unit... -
Page 21: Application Data
5 Application Data 5 Application Data 5.1 Operating limits Cooler Minimum Maximum Entering temperature at start-up ° C ° C Leaving temperature during operation ° C ° C Entering/leaving temperature difference at full load 3.8° C 8° C Condenser Minimum Maximum Entering temperature at start-up 19°... -
Page 22: Variable Flow Evaporator
5 Application Data R134a Cooler water flow rate m Condenser water flow rate m Model Minimum Maximum Minimum Maximum SCWE100M SCWE130M SCWE150M SCWE180M SCWE200M SCWE230M SCWE250M SCWE300M SCWE340M SCWE370M SCWE400M SCWE460M SCWE510M SCWE600M 5.3 Variable flow evaporator Variable evaporator flow can be used. The controlled flow rate must be higher than the minimum flow given in the table of permissible flow rates and must not vary by more than 10% per minute. -
Page 23: Physical And Electrical Data
6 Physical and Electrical Data 6 Physical and Electrical Data 6.1 Physical data R134a Unit model Cooling (kW) Input(kW) COP(W/W) Refrigerant charge (kg) 337.0 59.75 5.64 SCWE100M 436.3 76.68 5.69 SCWE130M 535.3 93.61 5.71 SCWE150M 627.7 109.9 5.71 SCWE180M 714.1 126.9 5.62 SCWE200M... -
Page 24: Compressor Electrical Data
(1) All connections to the system and the electrical installations must be in full accordance with all applicable codes. (2) The Midea chillers are designed and built to ensure conformance with local codes. Indoor installation requirement: Ambient temperature range: 5~42℃... -
Page 25: System Security Features
6 Physical and Electrical Data input voltage, low input voltage, phase reversal and lack of phase. The control section contains touch screen and microprocessor board. 6.4.2 Controller Micro-computer control device is installed as standard on all the units; it can be used to alter unit set points and control commands. - Page 26 6 Physical and Electrical Data Display of status safety devices 6.4.6 Convenient control Automatic microcomputer control. Because adopt control, peripheral equipment and unit carry out automatic control, the user simply start / stop. Large touch screen. Protection Various of unit protective measure make sure the unit safe and reliable operation, fault information display to facilitate maintenance person to diagnosis and repair.
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Page 27: Preliminary Checks
7 Preliminary Checks 7 Preliminary Checks 7.1 Check equipment received 1、Inspect the unit for damage or missing parts. If damage is detected, or if shipment is incomplete, immediately file a claim with the shipping company. 2、Confirm that the unit received is the one ordered. Compare the name plate data with the order. 3、The unit name plate must include the following information: ... -
Page 28: Checks Before System Start-Up
7 Preliminary Checks Before sitting the unit checks that: 1、The permitted loading at the site is adequate or that appropriate strengthening measures have been taken. 2、The unit is installed level on an even surface (maximum tolerance is 5 mm in both axes). 3、There is adequate space above the unit for air flow and to ensure access to the components. -
Page 29: Installation
2. Level the unit to but not more than 1/4(6.35mm) across width and length during lifting. 3. Midea company would not answer for any unit damage or human being hurt caused by improper unit lifting work! 8.2 Required installation place... -
Page 30: Installation Basement
8 Installation Place without the interference of sunlight other kind of heat source. Place close to electrical source for wiring. Place with solid basement preventing causing resonance and noise. Clean, bright and well ventilated place. Place where it is convenient for piping and water drainage with the least influence to surroundings caused by noise, cool or heat wind. -
Page 31: Absorbers
8 Installation 8.3.1 R134a type For single/Dual compressor unit 8.3.2 Level the basement to ensure not more than 5 mm unit incline after installation. 8.3.3 Absorber (isolation pad or vibration isolator) should be installed to eliminate the vibration and reduce the sound level during unit operation, absorber could also prevent vibration introduced into building. - Page 32 8 Installation Typical isolation pad Typical vibration Isolator ≥ 8.4.2 Expected load bearing value listed below. Isolation pad Vibration Isolator Model Minimum load Minimum Minimum load Quantity bearing (kg/EA) Quantity bearing (kg/EA) SCWE100M SCWE130M 1000 1000 SCWE150M 1200 1200 SCWE180M 1400 1400 SCWE200M...
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Page 33: Water Connections
9 Water Connections 9 Water Connections For size and position of the heat exchanger water inlet and outlet connections refer to the certified dimensional drawings supplied with the unit. The water pipes must not transmit any radial or axial force to the heat exchangers or any vibration. -
Page 34: Midea Recommendations On Heat Exchange Fluids
Before any start-up verifies that the heat exchange fluid is compatible with the materials and the water circuit coating. In case additives or other fluids than those recommended by Midea are used, ensure that the fluids are not considered as a gas. -
Page 35: Flow Control
Failure to follow this instruction will void the Midea guarantee. The water flow switch is installed on the cooler water inlet and adjusted by the control, based on unit size and application. If adjustment is necessary, it must be carried out by qualified personnel trained by Midea Service. -
Page 36: System Piping Connection
9 Water Connections Before this operation we recommend draining the circuit and disconnecting the pipes to be sure that NOTE: the bolts are correctly and uniformly tightened. 9.5 System piping connection Condenser, cooling water piping suggested piping as follow： Cooling tower Condenser inlet water... - Page 37 The use of untreated or improperly treated water may result in unit fouling, erosion, corrosion, Midea Company assumes no responsibility for unit failures from using untreated or improperly treated water.
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Page 38: Electrical Connection
10 Electrical Connection 10 Electrical Connection Warning: A special power should be used for water cooled screw chiller, and the voltage should not exceed the allowed range. Only a qualified service technician electrician can perform unit external wiring connection. ... -
Page 39: Field Wiring
Please refer to the current data in electrical table, users can choose proper power cable according to local standard, and the wire diameter should not be less than recommended wire size. Midea has no liability for electrical accident caused by the oversight of users. Power supply wiring... - Page 40 Water 3～ The water pump must be separately powered. pump Never lead out a power supply from the central air conditioning unit.Midea is not liable in any way if this occurs. Water Pump Wiring Diagram...
- Page 41 10 Electrical Connection Recommended external wiring cable Max running Compressor start Recommended external wiring Recommend Model current (A) current (A) cable breaker current (A) SCWE100M 154.6 315.0 SCWE130M 208.0 415.0 SCWE150M 235.0 479.0 SCWE180M 260.0 506.0 SCWE200M 301.0 650.0 SCWE230M 369.0 845.0 SCWE250M...
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Page 42: Operation
11 Operation 11 Operation 11.1 Operation 11.1.1 Unit Operation Flowchart User interface: User Welcome interface password: 40828 Password input Enter user password interface Home Page Parameter Mode settings STATUS ALARM Settings Screen ALARM User Settings Message Brightness Multi-Connection Historical records Timer settings TEMP/PRES Time Settings... - Page 43 11 Operation Main control board and HMI program version number Figure 11.1 (Note: subject to the actual display contents of the unit) Press "Enter" or a blank space to enter the password input interface, as shown in Figure 11.2. 11.1.2.2 Password input interface Tap to return to Tap here to the welcome...
- Page 44 11 Operation Figure 11.3 (Note: subject to the actual display contents of the unit) Enter the password (the user password is 40828) on the digital keypad, tap "Enter" to return to the password login interface, and then tap "ENTER" to enter the home page, as shown in Figure 11.4. 11.1.2.3 Home page Display if there is a unit fault...
- Page 45 11 Operation in the lower right part of the interface. The unit returns to the welcome interface. The following table provides the current status display and status description of the unit: Standby The unit is not running, but can be started normally. The unit fails and cannot be started.
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Page 46: Mode Settings
11 Operation 11.1.2.4 Mode settings Press "MODE" on the home page to open the mode setting window, as shown in Figure 11.5. Control Mode Operating Mode Single-compressor and dual-compressor Figure 11.5 (Note: subject to the actual display contents of the unit) Set the control mode (Local, REMOTE, TIMED, BMS), operating mode (Cooling, HEATING, PUMP), single-compressor or dual-compressor (Dual, NO.1, NO.2) on the displayed interface. -
Page 47: Power-On/Off Operations
11 Operation remains in the status before switching. If the power-on/off signal is present in the current control mode after switching, the unit will power on/off the unit according to the power-on/off signal in the current mode. ② Operating mode: Cooling, HEATING, PUMP. The function options of different operating modes vary with different models. - Page 48 11 Operation Figure 11.6 (Note: subject to the actual display contents of the unit) If the startup button is pressed when the startup conditions are not met, a message is displayed on the top of the displayed page: "Failure to start, please check the status", as shown in Figure 11.7. Compressor startup conditions include the lubricating oil temperature or oil heating time, time interval for re-startup, compressor startup temperature, etc.
- Page 49 11 Operation Press (a gray icon) to display the shutdown confirmation interface. Touch OK. "Stopping" appears. After the unit meets shutdown conditions, it implements the shutdown procedure. (2) Power-on/off in remote control mode: First select "Remote Control" (Welcome -> Login interface -> MAIN -> MODE) on the mode setting interface, and enable or disable the corresponding functions through the two input points "Remote Start"...
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Page 50: Status Information
11 Operation completed. The cooling water pump will be stopped m8 seconds later, and the frozen water pump will be stopped m9 seconds later. 11.1.2.6 Status Information 11.1.2.6.1 Status Information - Information Data Display Tap "STATUS" on the home page as shown in Figure 11.4 to enter the information data interface, as shown in Figure 11.8. - Page 51 11 Operation ② Comp. Running; ③ Compressor start count; ④ Unit load; ⑤ Unit alarm: "Alarm" must be "NO" before the compressor can start up; otherwise "YES" blinks; ⑥ Displays whether oil heating is completed. "Remaining Time/Oil Heating" must be 0 or "Oil Temp. Allow Compressor Start"...
- Page 52 11 Operation and the information data interface of 2# unit. 11.1.2.6.2 Status Information - TEMP/PRES Display Tap "TEMP/PRES" on the information data interface 11.8 to enter the TEMP/PRES interface, as shown in Figure 11.9. The TEMP/PRES interface displays the current temperature, pressure, current, frequency and other related parameters of the unit.
- Page 53 11 Operation Figure 11.10 (Note: The displayed contents of the actual unit should prevail) ① "Remote Start/Remote Stop": displays the status of remote startup and the user's remote shutdown points. The user needs to install the pulse-mode control switch or hold-mode control switch according to actual conditions.
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Page 54: Alarm Information
11 Operation ② Due to the limited size of the interface, some switching values of the unit are displayed on the second page. Tap the button in the lower right to switch between the first and second pages. Figure 11.11 (Note: subject to the actual display contents of the unit) 11.1.2.7 Alarm Information 11.1.2.7.1 Alarm Information - Real-time Alarm Information Display Tap "ALARM"... - Page 55 11 Operation the Up/Down button to check the faults. The real-time alarm information is displayed according to the occurrence sequence of alarms, and the maximum number of records is 100. The content of the last alarm is displayed on the first line, and so on. Each alarm record contains the date and time of the fault, the time of fault recovery, and the specific fault content.
- Page 56 11 Operation Figure 11.14 (Note: subject to the actual display contents of the unit) 11.1.2.8.1 PARAMETERS - PARAMETER SETTINGS On the interface shown in Figure 11.14, tap "PARAMETER SETTINGS" to enter the user temperature setting interface, as shown in Figure 11.15. Manual input allowed Figure 11.15 (Note: subject to the actual display contents of the unit)
- Page 57 11 Operation Figure 11.16 (Note: subject to the actual display contents of the unit) Set MAX in the upper left of the window to the upper limit of set parameter and MIN to the lower limit of the set parameter (the value out of the range not accepted). Press "Enter" to confirm the input. Press "Esc" to cancel the input.
- Page 58 11 Operation 11.1.2.8.2 PARAMETER - CLOCK SETTING Tap "CLOCK SETTINGS" in the "PARAMETERS" interface to enter the time setting interface as shown in Figure 11.17. Tap "Editor" to enter editing mode, tap the value box to be set to display a numeric input keyboard. Enter the corresponding time and press "Enter"...
- Page 59 Figure 11.17 (Note: subject to the actual display contents of the unit) 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. 11.1.2.8.3 PARAMETER - Brightness Tap "Brightness"...
- Page 60 11 Operation 11.1.2.8.4 PARAMETERS - Load Limited Tap "Load Limited" on the PARAMETER interface to enter the interface as shown in Figure 11.19. Here, the current parameter is set for the fixed frequency unit to implement load limit control, and the power parameter is set for the inverter unit to implement load limit control.
- Page 61 11 Operation ① The 1# and 2# rated current values and the 1# and 2# current percentages should be set for the fixed frequency unit. ② The 1# and 2# rated power values and the 1# and 2# power percentages should be set for the inverter unit. ③...
- Page 62 11 Operation Figure 11.20 (Note: subject to the actual display contents of the unit) Notes: ① If the unit is in standby status and the "Start Time" and "Stop Time" settings in this segment are the same, when the set start/stop time arrives, the shutdown priority principle will cause the unit to not be started.
- Page 63 11 Operation and interface are fixed and cannot be set. After setting the parameters in the input boxes on the right, tap the above "Save" button to save the parameter setting results to the data boxes on the left. Now, the parameters are set successfully.
- Page 64 11 Operation Figure 11.22 (Note: subject to the actual display contents of the unit) On the "Multi-Connection SET" homepage, tap to switch between select the multi-control mode. When the mode is selected, the unit cannot implement multi-connection; when the mode is selected, the unit can implement setting of the multi-connection mode.
- Page 65 11 Operation Figure 11.23 (Note: subject to the actual display contents of the unit) . The unit enters the "Multi-Connection SET" interface in the multi-connection mode, as shown in Figure 11.24.
- Page 66 11 Operation Figure 11.24 (Note: subject to the actual display contents of the unit) In the multi-connection mode, units 1 to 8 are connected in parallel, units 9 to 16 are series units of units 1 to 8, the priorities of the main system and the corresponding serial system are set to the same by default, and the corresponding relationship is shown on the interface.
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Page 67: Precautions
11 Operation Backup icon is ; if Backup is not selected, the Backup icon is . Only one of the H, M and L options of Priority and the Backup option is valid at the same time. When multi-connection is enabled, the enable icon is . - Page 68 11 Operation compressor and the system before adding new refrigerator oil and changing the dry filter. Qualitative change may happen when some synthetic oil mix up with mineral oil. Therefore, after adding the new refrigerator oil, change the new refrigerator oil to completely remove the remaining oil after starting up again. 3.
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Page 69: Trouble Shooting
11 Operation 11.3 Trouble shooting 11.3.1 Fault Messages In addition to the powerful microcomputer control function, the control system for this screw chiller has a series of self-protection functions, as shown in the following table. These ensure that the unit can operate safely when unattended. - Page 70 11 Operation it will not be allowed to start. If the unit is in operation, it will There is no low pressure switch Low Pressure Protection shut down. If it is not in operation, protection signal (OFF) it will not be allowed to start. If the unit is in operation, it will There is no high pressure switch High Pressure Protection...
- Page 71 11 Operation it will not be allowed to start. If the corresponding compressor is in operation, it will shut down. If EXV Protection EXV protection status value is not 0 it is not in operation, it will not be allowed to start. 12.3.2 Fault Analysis and Troubleshooting Symptom Possible Cause...
- Page 72 11 Operation expansion valve) module is incorrect. 2. Replace the EXV body. 2. The expansion valve core is 3. Set the correct EXV parameters stuck. 4. Replace the EXV control module. 3. The expansion valve parameter settings are incorrect. 4. The EXV control module is damaged.
- Page 73 11 Operation 4. Oil is lost or the oil level is return is normal or add lubricating oil. low. 5. Check the auxiliary cooling system and 5. The pressure ratio is too ensure normal action. large and auxiliary cooling is 6.
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Page 74: Standard Maintenance
12 Standard Maintenance 12.1 Maintenance and repair Air conditioning equipment must be maintained by professional technicians, whilst routine checks can be carried out locally by specialized technicians. Simple preventive maintenance will allow you to get the best performance from your chiller: ... - Page 75 program of unit Record operating Once per 2 hours on schedule parameters Dry Filter At any time Cleaning At any time Keep the unit clean Do scaling with iron brush and Rust At any time cover it with antirust paint Appearance of Stableness At any time...
- Page 76 Keep high pressure within fiducial Cleanness At any time value. Drain the water before longtime Water in pipes should Drainage At any time rest. be also drained. Pressure At any time 1~1.5MPa The difference between Cooling water outlet temperature and Cleaning need to be refrigerant temperature in Scaling Level of...
- Page 77 Monthly set temp.. After unit operation three years, please contact a qualified maintenance organizations, such as Midea local customer service department to do a comprehensive inspection. Especially check the compressor, make sure the internal components in good status; inspect unit air tightness, heat exchanger copper pipe whether or not has leakage;...
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Page 78: Maintenance And Cleaning
condenser or evaporator frozen to damage! 12.1.2 Relation of pressure and water outlet temp. R134a type High pressure Abnormal: if the pressure≤6 Kg/cm2G or ≥12Kg/cm2G Fig.Ⅰ Relation of pressure and water outlet temp. (The high pressure at full load) ... - Page 79 Water of Ca2+, Mg2+ Hard -------- Hard furring will be built easily. Causticity will be very strong Water of Cl- Dirt resultant Very strong special for iron and copper. Hard CaSO4& CaSO2 will be built Water of SO42-, SiO22- Hard easily Hard &...
- Page 80 Individual ventilation piping towards to outside of equipment house have to be set for relief valves on pressure vessels in case of over pressure. Notices during unit running: 1. Electrical part: 1) check and confirm the voltage in normal range.(+/-10% nominal voltage) 2) check the running current in normal range.
- Page 81 Available Accessories List Q’ty Model Introduction Picture Name In the outlet pipe of evaporator, protecting heat exchange pipes Water switch FQS-030G from breakage due to the accidental freezing. Vibration damper is to reduce Vibration SHA-D the vibration and noise by damper Series isolating the supports from the...
- Page 82 Throttling electronic expansion valve 2# suction temperature 1# suction temperature Expansion Comm. 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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