Midea MLSC380A-SB3Z Installation, Operation And Maintenance Manual
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Midea MLSC380A-SB3Z Installation, Operation And Maintenance Manual

Midea MLSC380A-SB3Z Installation, Operation And Maintenance Manual

Air-cooled screw chiller unit
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DM16-03.01.46en
Applicable Model:
MLSC380A-SB3Z/MRH380A-B3Z
MLSC500A-SB3Z/MRH500A-B3Z
MLSC600A-SB3Z/MRH600A-B3Z

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Summary of Contents for Midea MLSC380A-SB3Z

  • Page 1 DM16-03.01.46en Applicable Model: MLSC380A-SB3Z/MRH380A-B3Z MLSC500A-SB3Z/MRH500A-B3Z MLSC600A-SB3Z/MRH600A-B3Z...
  • Page 2 Notice The installation section of this manual is designed for qualified persons only. Be sure to read the operating section before conducting operation in order to prevent unit damage and unnecessary accidents. The contents of this manual are subject to change without prior notice for further improvement of related models.
  • Page 3 Safety Warning The MLSC_A series units adopt the R134a refrigerant, which is the mid-pressure medium and liquefied gas. The saturated vapor pressure of R134a refrigerant corresponds to the temperature. That is, if the temperature is high and the corresponding saturated vapor pressure is high too.
  • Page 4 damage. Do not drag and distort power cables and communication lines, avoiding major failure. Please wring the cloth dampened with neutral water, and wipe the unit to remove fouling. Do not use acidic, alkaline chemicals. If fire breaks out accidentally, you should immediately shut down the main power and use fire extinguisher applicable to oil fire and electric fire.

  • Page 5: Table Of Contents

    Contents 1 Introduction ......................... 1 1.1 Function ....................... 1 1.2 Features ....................... 1 1.3 Product Components ................... 2 2 Model, Specifications, and Application Range ............7 2.1 Specifications ....................... 7 2.2 Application Range ....................10 3. Evaporator Pressure Drop Curve ................10 4.
  • Page 6 10.2 Cleaning the Shell-and-Tube Heat Exchanger ..........106 10.3 Procedure for Replacing the Dry FilterElement ..........108 10.4 Lubricant ......................108 10.5 Charging and Evacuating Refrigerants ............108 10.6 Routine Maintenance Items ................109 10.7 Safety Requirements for Maintaining the Water Chiller Unit ......111...

  • Page 7: Introduction

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 1 Introduction 1.1 Function The air source screw water chiller unit has been forging ahead at the forefront of air-cooled unit. It saves various auxiliary parts such as cooling tower, cooling pump, and corresponding pipe systems. Featuring simple system structure, it saves installation space.

  • Page 8: Product Components

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual workload, material, and installation cost. (5) Customers only need to connect the refrigerant pipes, evaporator water pipes, and power cables between outdoor units and indoor units to use the units, simplifying the entire installation process. (6) The split design of units is free of larger installation base, and removes the oil cooler and related purification systems, reducing the unit weight.
  • Page 9 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 1.3.1 Compressor (1) The unit adopts twin-screw compressor designed with the most advanced, industrial third-generation asymmetric technology of 5 gear teeth to 6 gear teeth. The screw rotor is a patented product based on effective improvement of the German GHH rotor profile.
  • Page 10 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual The safety valve of units helps release the dangerous high pressure. To avoid device damage and personal injury, these apparatuses must work in the optimal status. Therefore, it is necessary to perform the following maintenance tasks: (1) Disassemble the eduction pipe of the outlet value at least once a year to check whether corrosion, rust, dust, scale deposit, and leakage are found inside the value.
  • Page 11 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 1.3.8 Variable Capacity Adjustment, High Efficiency, and Energy Saving The high-precision capacity control valve traces the unit’s load changes and adjusts the refrigerant volume. The capacity adjustment can adopt four-step control mode (25%, 50%, 75%, and 100%) or stepless adjustment (this function must be noted on the order), which saves operating cost for customers.

  • Page 12: Model, Specifications, And Application Range

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 2 Model, Specifications, and Application Range 2.1 Specifications 2.1.1 Nominal Cooling Capacities Indoor Unit MLSC380A-SB3Z MLSC500A-SB3Z MLSC600A-SB3Z Model Cooling capacity Cooling input power kW Semi-hermetic twin- screw Semi-hermetic twin- screw...
  • Page 13 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual (1) Nominal cooling capacities are based on the following conditions: Chilled water inlet/outlet temp: 12° C/7° C; Indoor temp: 35° C. (2) Only performance parameters of the basic module are listed. You can obtain performance parameters of unit combinations by referencing the listed parameters.
  • Page 14 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Outdoor Unit MRH380A-B3Z MRH500A-B3Z MRH600A-B3Z Model Three-phase five-wire system Power supply 380V/3P+N+PE /50Hz Type Internal threaded pipes + aluminum fins Fan Quantity Air volume (m 23000x6 23000x8 23000x10 side heat Motor input power (kW)

  • Page 15: Application Range

    The height of water drainage should Drainage system not be higher than the base of the unit on the spot. 3. Evaporator Pressure Drop Curve Evaporator Water Pressure Drop Curve MLSC500A-SB3Z MLSC600A-SB3Z MLSC380A-SB3Z Evaporator Water Flow /m ·h...

  • Page 16: Accessories And Models With Special Features

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 4. Accessories and Models with Special Features 4.1 Standard Accessories Name Unit Quantity Specifications Product certificate Piece User manual Piece Water flow controller Piece G1" Packing list Piece 4.2 Optional Accessories Name Unit...

  • Page 17: Operating Principle

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 5 Operating Principle Air source screw water chiller comprises five major components including the compressor, finned heat exchanger, electronic expansion valve, shell-and-tube heat exchanger, and electric control system, and some auxiliaries such as the economizer.

  • Page 18: Installation

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6 Installation 6.1 Loading/Unloading and Hoisting (Diagram) (1) Units should be loaded and unloaded carefully to avoid causing damage to unit components. Use a crane to load and unload units and use a forklift for short-distance transportation. A skid can ensure that the weight of units is evenly distributed on the base.
  • Page 19 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Indoor units hoisting Outdoor units hoisting...

  • Page 20: Requirements For Foundation Installation And Diagrams Of Foundation

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.2 Requirements for Foundation Installation and Diagrams of Foundation 6.2.1 Requirements for Foundation Installation Air-cooled screw units should be installed outdoors, for example, on the rooftop, ground, or near the buildings.
  • Page 21 F o u n d a t i o n b o l t M 1 4 C o n t r o l b o x Weight to be supported by spring isolator (kg) Model MLSC380A-SB3Z MHD-850 MHD-850 MHD-850 MHD-850...
  • Page 22 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual MLSC500A Indoor unit F o u n d a t i o n U n i t b o t t o m F o u n d a t i o n b o l t M 1 4 C o n t r o l b o x Weight to be supported by spring isolator (kg)
  • Page 23 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual MLSC600A Indoor unit F o u n d a t i o n U n i t b o t t o m F o u n d a t i o n b o l t M 1 4 C o n t r o l b o x Weight to be supported by spring isolator (kg)

  • Page 24: Installation Space And Appearance

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.3 Installation Space and Appearance 6.3.1 Installation Space Requirements for Outdoor Units Enough space must be left around units and between units to ensure sufficient fresh air for air-side heat exchangers in units.
  • Page 25 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual In areas where strong monsoon exists, if the unit's heat exchanger faces the direction from which the monsoon comes, the air flow will occur when the monsoon wind velocity is higher than the fan blowing velocity, as the dashed arrow shown in the following figure.
  • Page 26 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual (4) Requirements for installing indoor units are as follows: The distance between the power control cabinet and the windbreak must be larger than 1,000 mm. The distance between the unit and the windbreak on the side of shell-and-tube end caps must be larger than 3,500 mm.
  • Page 27 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual >1.2m >3.5m Door Room...
  • Page 28 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual...
  • Page 29 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.3.2 Installation Requirements for the Pipe Connection Between Outdoor Units and Indoor Units (Supplementary) 6.3.2.1 Basic Piping Requirements Operation processes are as follows: Specify pipe route and dimensions based on the construction drawing Prepare and install the pipe supports, hangers, and brackets Prepare and place the pipe components...
  • Page 30 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Risers are fastened along walls. Round mooma, instead of common insulation materials, is used at pipe straps. U-shaped pipe straps are installed outside the mooma. Anti-corrosion processing of mooma is required.
  • Page 31 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.3.2.7 Pipe Sealing Optional measures of sealing are as follows: (1) Use end caps and adhesive tapes (for short-period storing) (2) Solder sealing (for long-time storing) Note: Copper pipes must be sealed at any time during on-site construction as required. Sealing with end caps and adhesive tapes Insert Wrap the joints firmly...
  • Page 32 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual (5) Cover the pipe end temporarily when the pipe is being installed through a wall. (6) Do not directly place the pipe on the ground. Do not rub the pipe against the ground. (7) In the case of rain, cover the pipe end before installation.
  • Page 33 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Copper Pipe End Trimming (1) Purpose Remove the burr on pipe ends and clean the inner space of pipe. In this way, no scratch will occur on the sealing interface during pipe end expansion. (2) Operation method ①...
  • Page 34 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual and blisters at soldering points, or even soldering failure. Nitrogen protection diagram is as follows. Preparing the connector of nitrogen-filled hose Connect the nitrogen-filled hose to the pipe component to be soldered and seal all other pipe ends except for the soldering end which is used for nitrogen filling.
  • Page 35 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Operation requirements (1) During soldering, the nitrogen pressure must be controlled within the range of 0.2 kgf/cm² to 0.3 kgf/cm². (2) Only nitrogen is used. Do not use oxygen or other inflammable or combustible gases. Otherwise, explosion may occur.
  • Page 36 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.3.2.10 Pipe Blowing Blowing of copper pipe (1) Principle of operation: Blow pressure gas into pipes (raw material pipes or soldered components) to remove the dust and water inside the pipes. (Solid impurities cannot be removed; therefore, relevant protective measures must be taken during implementation.) (2) Purpose ①...
  • Page 37 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual moisture that are cleaned out from the pipe and clean the pipe thoroughly. Specific measures are as follows: ① Use nitrogen to flush dirt and moisture out of the pipe. ②...
  • Page 38 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual (3) Only dry nitrogen can be used as the medium for air tightness test. The pressure increasing in difference phases is shown in the following table. Acceptance S/N Phase (Pressure Is Increased in Different Phases) Criterion Phase one: Large leak sources can be detected if the air pressure is kept at 3.0 kgf/cm...
  • Page 39 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual ① Compressed nitrogen (R134a system: 20 kgf/cm ) is used for the air tightness test. ② Oxygen, inflammable gases, or toxic gases cannot be used for an air tightness test. ③...
  • Page 40 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Note: The vacuum drying procedure must be strictly performed for all systems. Otherwise, ice plug will occur. (1) Procedure for common vacuum drying ① Vacuum drying (the first time): Connect the pressure measuring set to the stop valve of the liquid pipe and gas pipe.
  • Page 41 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.3.2.13 Refrigerant Recharge 6.3.2.13.1 Procedure Operation steps (1) Ensure that vacuum drying is completed. (2) Calculate the amount of refrigerant to be recharged (based on the recommended value, actual liquid pipe dimensions, and length specified in section 7.3.3.1).
  • Page 42 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual taken, condensation may occur and lead to leakage. (3) During the heating process, the temperature of outlet pipe (gas pipe) is usually high (50°C to 100°C). People may be burned if they accidentally touch the pipe. Selection of thermal materials Polyurethane foam (flame retardant: B1;...
  • Page 43 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual over-tightened bandage can break the thermal insulation connector. Therefore, do not use bandage. b. Ensure the insulating performance of pipe connectors. (3) Precautions ① There should be no gap between joints of insulating materials. ②...
  • Page 44 Liquid Vent Liquid pipe pipe pipe pipe pipe pipe Recharged Recharged MLSC380A-SB3Z 2 1.4 kg/m 0.07 L/m MLSC500A-SB3Z 3 in 3 in 3 in 1.4 kg/m 0.07 L/m MLSC600A-SB3Z 3 2.5 kg/m 0.12 L/m Incorrect installation of vent pipe through a wall...
  • Page 45 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Correct installation of vent pipe through a wall When the difference of the height of indoor unit and outdoor unit is greater than 6 m, you are advised to install the vertical part of the vent pipe in the method shown in the following figure.
  • Page 46 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Recommended external diameters of connection pipes when the vertical part of the vent pipe comprises two pipes Length Connection Length of the Connection Pipe of Vent Connection Pipe Model Pipe Pipe (m)
  • Page 47 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Installation diagram when the vertical part of the vent pipe comprises a single pipe 6.3.3.2 Lubricant Recharge When the connection pipes are installed and the inner part of the pipes are clean and vacuum (the vacuum degree is –756 mmHg or lower), lubricant can be recharged.
  • Page 48 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.3.4 Unit Appearance Appearance of MLSC380A(500/600) indoor unit Inlet condenser interface Outlet condenser Water outlet Water inlet interface Inlet Outlet Frozen Model condenser condenser water MLSC_A interface interface interface 3300 1200 1830 2330 539 1824...
  • Page 49 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Appearance of MRH380A-B3Z(500/600) outdoor unit Inlet condenser Outlet condenser interface interface Inlet Outlet Model condenser condenser MRH_A interface interface 3500 2280 2370 1335 1170 φ67 φ42 4491 2280 2370 1226 1046...

  • Page 50: Requirements For Water System Installation And Recommended Diagram For The Water System

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.4 Requirements for Water System Installation and Recommended Diagram for the Water System 6.4.1 Requirements for Water System Installation When installing the water system, you must follow general installation rules to achieve the maximum working efficiency.
  • Page 51 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual to refrigerant leakage. An overlarge water flow will cause corrosion. Do not expose the water in the circulating system to the air, as shown in the following figure. If water is exposed to the air, the amount of the dissolved oxygen will increase, and atmosphere pollutants will coagulate in water.
  • Page 52 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual d) For easy inspection and repair, a thermometer and a pressure gauge must be installed on the water inlet and outlet pipes. e) A water flow switch must be installed on the water outlet pipe of each evaporator. Both ends of the water flow switch must be a horizontal straight pipe with the length more than five times of pipe diameter.

  • Page 53: Electrical Installation

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.5 Electrical Installation 6.5.1 Electrical Wiring Notes: (1) A dedicated power supply must be used for the air conditioner. The voltage of the power supply must comply with the rated voltage. (2) The wiring construction must be carried out by professional technicians based on the circuit diagram label.
  • Page 54 Cable Selection Criteria for Units Recommended Power Recommended Model Remarks Cable Breaker Capacity MLSC380A-SB3Z BVR120*4+BVR70*1 330 A Copper core cables must be used for the unit. If the unit is used in MLSC500A-SB3Z BVR240*4+BVR120*1 500 A high temperature, the capacity of the breaker may decrease.
  • Page 55 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 6.5.2 Power Supply Specifications and Use Environment The unit must run in the following environment: Outdoor temperature: 10° C to 43° C Altitude: ≤ 1000 m Power supply frequency: 50±2% Hz Voltage: 380±10% V 6.5.3 Power Supply Requirements The power supply must comply with the calibration values on the nameplate of the unit.
  • Page 56 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Wiring diagram for the main power cable of the indoor unit External wiring diagram for indoor units of the MLSC380A-SB3Z, MLSC500A-SB3Z and MLSC600A-SB3Z series. Note: All inputs must be passive dry contacts, and all outputs must be transferred by using an...
  • Page 57 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Wiring diagram for the main power cable of the outdoor unit External wiring diagram for outdoor units of the MRH380A, MRH500A, and MRH600A series. Note: The indoor and outdoor units must be supplied power independently. If the unit is not in use for a long time, you can cut off the main switch in the power distribution cabinet.
  • Page 58 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Electrical wiring diagram for the indoor and outdoor units Electrical wiring diagram for the indoor and outdoor units of the 380/500/600 series Note: The above figure shows the diagram for connecting the fan's control signal wires and motor overload feedback signal wires.
  • Page 59 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual (6) It is prohibited to pass power cables and control wires that are not connected to the electric control box through the electric control box. Otherwise, the unit and controller may be faulty or even be damaged due to electromagnetic interference, and the protection may fail.
  • Page 60 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Diagram for water pump combination control The connection of the water pump must comply with the diagram, and an intermediate relay must be used. If you do not use the combination control function for the water pump, ensure that the pump has started before you start the unit.
  • Page 61 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Wiring Diagrams Wiring diagrams for MLSC380A-SB3Z, MLSC500A-SB3Z and MLSC600A-SB3Z 4/7C 1X:44 4/7B 1X:43 3/12C 1X:21 3/12C 1X:22...
  • Page 62 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 1X:77 1X:78 1X:79 1X:80 4/10B 4/10B 6/9F 6/10F...
  • Page 63 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual...
  • Page 64 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual X:34 X:33 X:32 X:31 X:30 X:29 X:28 X:27 X:26 X:25 X:24 X:23...
  • Page 65 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual X:22 X:21 X:19 X:20 X:18 X:17 X:15 X:16 1X:19 1X:20 1X:18 1X:17 1X:15 1X:16 1X:14 1X:13 1X:11 1X:12 1X:10 1X:9 TM2DOCKN...
  • Page 66 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 2/7E 2/8E 1X:73 1X:72 1X:70 1X:71 TM2ARI8LT 5/12E...
  • Page 67 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual...
  • Page 68 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Wiring diagram for MRH380A-B3Z 2X:32 2X:31 2X:30 2X:29 2X:28 2X:27 2X:26 2X:25 2X:24 2X:23 2X:22 2X:21 2X:20 2X:19 2X:18 2X:17 2X:16 2X:15 2X:14 2X:13...
  • Page 69 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Wiring diagram for MRH500A-B3Z 2X:38 2X:37 2X:36 2X:35 2X:34 2X:33 2X:32 2X:31 2X:30 2X:29 2X:28 2X:27 2X:26 2X:25 2X:24 2X:23 2X:22 2X:21 2X:20 2X:19 2X:18 2X:17 2X:16 2X:15 2X:14 2X:13...
  • Page 70 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Wiring diagram for MRH600A-B3Z 2X:44 2X:43 2X:42 2X:41 2X:40 2X:39 2X:38 2X:37 2X:36 2X:35 2X:34 2X:33 2X:32 2X:31 2X:30 2X:29 2X:28 2X:27 2X:26 2X:25 2X:24 2X:23 2X:22 2X:21 2X:20 2X:19 2X:18...

  • Page 71: Commissioning

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 7 Commissioning 7.1 Check Before Commissioning 7.1.1 Water System Ensure that all pipelines in the water system are clean and that the pipeline connection and water flow direction are correct. Check that the outlet and inlet pipes are in proper connection.

  • Page 72: Commissioning Operations

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual resistance, and resistance to ground) of the compressor are normal. Cut off the power supply of the compressor and then turn on the main power supply. Start the unit and check whether the switch between the star and delta AC contactors is normal (that is, check the voltage between the three contacts is 380 V).
  • Page 73 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Stop the unit and check whether the oil level of the compressor is normal. To ensure that the unit can run all the time, start all terminal devices to provide sufficient air conditioning load.

  • Page 74: Daily Use Of The Unit

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8 Daily Use of the Unit 8.1 Check Before Use (1) Judge whether the time for heating up the refrigerator oil of the compressor is long enough. When you initially start the unit after it is powered off, the refrigerator oil must be preheated for 24 hours.

  • Page 75: Control Interface Structure

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.4 Control Interface Structure Welcome Page Password Homepage Mode selection Status Setting Alarm AI/O Password Screen Modify Clock Comm. DI/O parameter Setting Setting Setting...

  • Page 76: Operation

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.5 Operation Notes: (1) The touchscreen displays the time of each event. Except programmable logic controller (PLC) events, the time of other events is consistent with that shown on the touchscreen. (2) It is prohibited to disassemble the display or add a communication wire for remote control.
  • Page 77 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual This message indicates that system is in the initialization process and blinks once every second. This process may take about 30 seconds. Power indicator Running indicator Communication indicator Controller program's version number...
  • Page 78 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual On the keypad, enter 58806 and click Enter to enter the mode setting page. Control mode display Current running display Control mode Running mode setting setting On this page, set a control mode and a running mode. The system's current control and running modes are displayed in the upper part of the screen.
  • Page 79 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Notes: (1) If the system is running, you can only change the control mode. Other modes cannot be changed. (2) The control mode is used to select a startup/shutdown mode for the unit. When the control mode is set to LOCAL, you can start or stop the unit by clicking the START or STOP button.
  • Page 80 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual PAUSE: indicates that the energy adjustment device is standby and waits for temperature recovery. After the temperature is recovered, the compressor starts automatically. FAULT: indicates that the unit is encountering a fault. After the fault is rectified, the status disappears. On the main page, click to enter the password entering page.
  • Page 81 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual On this page, you can set the following items: Temperature control range, temperature control period, control target temperature, and compressor startup temperature. Notes: (1) On the password entering page, you can set an upper limit in the Max text box, and a lower limit in the Min text box.
  • Page 82 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual On the user parameter setting page, click Clock Setting to set the time and date of the PLC and touchscreen. Note that you must click Confirm within 1 minute after you enter the time. During this process, you must set a valid date and time.
  • Page 83 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual company to perform relevant settings for these units. After the setting is complete, click . It then turns to , indicating that the units are in the combination control state. Then at the bottom of the screen, set the number of units that need combination control.
  • Page 84 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual setting page. Click this button to enter the starting/shutdown time setting page. Starting/shutdown time settings take effect only when CONTROL MODE is set to TIMED. On the above page, you can set the starting and shutdown time of the unit on each day of a week. The unit starts and shuts down based on the settings.
  • Page 85 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual On this page, you can click to view a maximum of 100 historical alarm messages of the unit.
  • Page 86 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual When the unit generates an After a unit alarm is alarm and the alarm is not reset, alarm information If the alarm is cleared, reset, alarm information is is white and warning click Reset to reset the red and warning time is...
  • Page 87 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Click on the main page to enter the combination mode query page. Note: The Multi-status button is available only when COMBINSTION MODE is set to MULTI-UNIT on the user parameter setting page.
  • Page 88 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual On this page, you can select a module to view its status or monitor the master unit to view the status of each unit. To do so, click to enter the page shown in the following figure.
  • Page 89 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Click PgDn to enter the page shown in the following figure. Click on the combination mode query page, or on the main page when a single unit is connected to enter the page shown in the following figure.
  • Page 90 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual On this page, you can view the following information: Type of the refrigerant used in the unit, running time of the compressor and pump, and remaining time for heating up the oil in the compressor. Whether the unit generates an alarm, whether the compressor startup temperature is met, and whether the compressor startup failure is caused by insufficient restart delay.
  • Page 91 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual On this page, you can view the unit's temperature and pressure. Click PgDn to enter the page shown in the following figure. This page displays the output status of the unit. OFF indicates that a point has no output. ON indicates that a point has output.

  • Page 92: Fault Alarm Function

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Notes: (1) Remote Start/Remote Stop: takes effect in remote control mode. (2) When there is no water flow, Water Switch is set to OFF. Otherwise, it is set to ON. (3) After contactors work properly during the compressor operation, Contactor Protection is switched from OFF to ON.
  • Page 93 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual level The oil level switch trips Stop the unit. The oil level of the compressor Manual protection out for 60 seconds. is too low. The oil level switch is faulty. The wiring is loose.
  • Page 94 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Short circuit The PT100's resistance Stop the unit. Manual outlet water is smaller than 20 . temperature sensor Open circuit The PT100's resistance Stop the unit. Manual inlet water is greater than 300 .

  • Page 95: Safety Protection Flowchart

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7 Safety Protection Flowchart 8.7.1 Water Flow Failure Water flow failure (unit stop) Check whether the C heck the water water flow switch pump and pipes trips out Contact the after-sale technical support...
  • Page 96 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.2 Freeze Protection Freeze protection (unit stop) Check whether the Check the water anti-freeze protection temperature switch trips out Contact the after-sale technical support...
  • Page 97 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.3 High Pressure Protection High pressure protection (unit stop) Check whether the h igh Check the fan and pressure protection setting value switch trips out Contact the after-sale technical support...
  • Page 98 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.4 Low Pressure Protection Low pressure protection (unit stop) C heck the water flow, Check whether the low water temperature pressure protection and setting value switch trips out Contact the after-sale technical support...
  • Page 99 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.5 Compressor Internal Protection Compressor internal protection (unit stop) Check the power Compressor internal supply, coil temperature, and protection switch open discharge temperature Contact the after-sale technical support...
  • Page 100 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.6 Low Oil Level Protection Low oil level protection (unit stop) Check whether the oil Check oil level level protection switch trips out Contact the after-sale technical support...
  • Page 101 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.7 Oil Pressure Difference Protection Oil pressure difference protection (unit stop) Check whether Check whether the oil the oil filter is pressure difference blocked protection switch trips out Contact the after-sale technical support...
  • Page 102 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.8 Compressor Overload Protection Compressor overload protection (unit stop) Check the Check whether the compressor 's working compressor's thermal condition and current overload protection switch trips out Contact the after-sale technical support 8.7.9 Fan Overload Protection Fan overload protection...
  • Page 103 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.10 Power Supply Failure Power supply failure (unit stop) Check the power Check whether the supply's voltage power supply and phase module trips out sequence Contact the after-sale technical support...
  • Page 104 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.11Contactor Feedback Protection Contactor feedback protection (unit stop) Run the unit, and check Check the whether a normally open contactor and contact disconnects. contact point Contact the after-sale technical support...
  • Page 105 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.12 High Temperature of Discharge Air Too high detection temperature (unit stop) Check the Check whether the temperature of the detection temperature inspection point exceeds the alarm value Contact the after-sale technical support...
  • Page 106 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.7.13 Short Circuit of the Outlet Water, Inlet Water, Ambient, or Discharge Temperature Sensor Short circuit of temperature sensor (unit stop) Check the electrical circuit Check whether the between the sensor resistance is smaller than 200Ώ...

  • Page 107: Precautions For Unit Operation

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 8.8 Precautions for Unit Operation WARNING To prevent personal injury or death due to contact with any moving or live part, cut off the master power supply before check or maintenance, and suspend a sign "switch-on prohibited"...

  • Page 108: Troubleshooting

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 9. Troubleshooting Symptom Cause Solution power supply power Power on after examination. interruption) Identify the cause for over current. If the contact capacity is too small, replace the On-off action (over current) contact capacity promptly.
  • Page 109 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Symptom Cause Solution Blocked chilled water filter Clean the chilled water filter. Temperature regulator failure Replace the temperature regulator. G. Malfunction of the Solenoid valve wire cut Replace the wire of the solenoid valve. automatic capacity Clean...

  • Page 110: Maintenance And Service

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 10 Maintenance and Service WARNING The water chiller unit must be maintained and serviced by experienced professionals. CAUTION Please print and fill in the sheets in appendixes 1 to 3 of this operation manual. 10.1 Normal Operating Pressure The following figures show the low pressure and high pressure of the water chiller unit.

  • Page 111: Cleaning The Shell-And-Tube Heat Exchanger

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 10.2 Cleaning the Shell-and-Tube Heat Exchanger Operation Procedure: Stop the water chiller unit and the circulating water pump. Disconnect the water system of the shell-and-tube heat exchanger. Install one acid-proof water pump to form a water circuit as shown in Figure 5.1. Figure 5.1 System connection diagram for clean water...
  • Page 112 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Connecting hose Chilled Acid proof water inlet water pump Rinse liquid Connecting hose Waste Sanitary water tank water tank Chilled water outlet Add clean water to the sanitary tank and operate the acid-proof water pump. Check that the water pipe is tightly installed in good ventilation without water leakage between joints and without abnormal sound during the operation.

  • Page 113: Procedure For Replacing The Dry Filterelement

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual 10.3 Procedure for Replacing the Dry FilterElement Turn off the shutoff valves on both ends of the drier-filter (if the shutoff valve is available only on one end, recycle refrigerants). Vent a slight amount of refrigerants out of the drier-filter.

  • Page 114: Routine Maintenance Items

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Method of charging and evacuating refrigerants: After evacuating the units, use the needle valves of the stop valves on both ends of the drier-filter to charge refrigerants. Evacuate refrigerants from the needle valves of the stop valves. Use a special refrigerant charging and evacuating device to charge refrigerants (R134a) to or evacuate refrigerants from the units.
  • Page 115 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Maintenance Acceptability Baseline Maintenance Items Remarks Frequency (Handling Method) Flake Use adhesives to paste the insulation insulation Anytime materials. materials Water Once Check whether the sewer is blocked. leakage month Check whether an abnormal sound can be...

  • Page 116: Safety Requirements For Maintaining The Water Chiller Unit

    Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual Maintenance Acceptability Baseline Maintenance Items Remarks Frequency (Handling Method) Check whether joint High-low structures Once Check based on the action values of pressure Action month various protection devices. switch good condition...
  • Page 117 Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual improper refrigerants will lead to unit failure or even compressor scrap. Use the lubricant brand defined in the technical specifications when maintaining or charging lubricants. Do not attempt to introduce oxygen to the supplying line of the unit because oxygen can react violently with oil.
  • Page 118 Appendix 1 Daily Inspection Record Sheet Ambient Inlet Water Outlet Water Exhaust Pressure Suction Pressure Exhaust Suction Date Temperature (° C) Temperature (° C) Temperature (° C) (bar) (bar) Temperature (° C) Temperature (° C) Note: This sheet will be printed and filled by customers. Please keep it carefully.
  • Page 119 Appendix 2 Key Component Inspection Record Sheet Water Side Heat Item Compressor Air Side Heat Exchanger Fan Valve Electric Control Cabinet Others Exchanger Interval Date Inspector Content Date Inspector Content Date Inspector Content Date Inspector Content Date Inspector Content Date Inspector Content Date Inspector Content 6 months 1 year 2 years...
  • Page 120 Appendix 3 Maintenance (Repair) Record Failure Description Handling Measures Handling Result Recorder Note: Fill in the sheet and keep it carefully.
  • Page 121 Relationship Between Water Quality and Scale/Corrosion Water Quality Scale Corrosion Remarks Acid water with a pH The water can generate Hard scale Strong lower than or equal to 6 CaSO easily. Alkali water with a pH Iron ion or aluminum ion higher than or Soft scale ——...

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