Gree LSQWRF35VM/NhA-M Service Manual
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Gree LSQWRF35VM/NhA-M Service Manual

Gree LSQWRF35VM/NhA-M Service Manual

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Service Manual
A series modular air-cooled chiller (heat pump)
LSQWRF35VM/NhA-M
LSQWRF60WM/NhA-M

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Summary of Contents for Gree LSQWRF35VM/NhA-M

  • Page 1 Change for life Service Manual A series modular air-cooled chiller (heat pump) LSQWRF35VM/NhA-M LSQWRF60WM/NhA-M...

  • Page 2: Table Of Contents

    Contents 1 Product information ..................3 1.1 Introduction .....................3 1.1.1 Lineup .....................3 1.1.2 Nomenclature ..................3 1.1.3 Product features ................4 1.1.4 Nominal operating conditions ............4 1.1.5 Operation range ................5 1.2 Performance correction curves ...............5 1.3 Working principle ..................6 1.4 Technical parameters ................8 1.4.1 Electrical parameters ..............8 1.4.2 Performance parameters ..............9 1.4.3 Scope of supply ................11...
  • Page 3 2.5.2 Network of the long-distance monitoring system ......19 2.5.3 Hardware ..................20 2.5.4 Model selection instructions ............21 3 Unit installation ....................23 3.1 Installation flowchart ................23 3.2 Preparations before installation ............24 3.2.1 Precautions for installation ............24 3.2.2 Importance of installation ..............25 3.3 Installation instructions .................26 3.3.1 Outline dimensions ...............26 3.3.2 Precautions for installation ............28 3.3.3 Installation environment ..............28...
  • Page 4 4.1.1 Flowchart of commissioning ............49 4.1.2 Safety precautions for commissioning ...........49 4.1.3 Preparation before commissioning ..........49 4.1.4 Check before commissioning ............49 4.1.5 Check for initial run ...............50 4.2 Troubleshooting ..................52 4.2.1 Diagnostics ...................52 4.2.2 Flow chart of troubleshooting ............54 4.3 Power distribution .................60 4.3.1 Power distribution logic ..............60 4.3.2 Introduction to main electric elements ...........60 4.3.3 Main board ..................61...
  • Page 5 Product Product...
  • Page 6 PREFACE Thank you for selecting Gree’s A Series Inverter Modular Air-cooled Chiller (Heat Pump). Please read this instruction manual carefully before installing and using the product, we hereby instruct as below: This Manual is applied to A Series Inverter Modular Air-cooled Chiller (Heat Pump), specifying operation safety requirements, basic principles and implementation approaches for construction fulfillment, construction debug, after-sale maintenance and repairs.

  • Page 7: Product Information

    For instance, LSQWRF60VM/NaA-M indicates an inverter modular air-cooled chiller with a fully enclosed rotor-type compressor, featuring 60kW cooling capacity and using R410A refrigerant. LSQWRF35VM/NhA-M indicates an inverter modular air-cooled chiller with a fully enclosed rotor-type compressor, featuring 35kW cooling capacity and using R32 refrigerant.

  • Page 8: Product Features

    1.1.3 Product features The all-inverter modular air-cooled chillers work outstandingly by virtue of their major features stated below. (1) Excellent compatibility The modular air-cooled chillers can be constructed of multiple single units with the same or different structure or capability (35kW, 60kW,). For the 35kW unit, it has only one cooling system; for the 60kW, 65kW units, they are of two independent systems.

  • Page 9: Operation Range

    Maximum entering water pressure Cooling 0.06MPa 1.6MPa Heating 1.2 Performance correction curves Here are curves indicating the unit performances in cooling and heating states. LSQWRF35VM/NaA-M, LSQWRF35VM/NhA-M LSQWRF35VM/NaA-M, LSQWRF35VM/NhA-M Cooling Heating Leaving water temperature (°C) Leaving water temperature (°C) LSQWRF60VM/NaA-M, LSQWRF60VM/NhA-M...

  • Page 10: Working Principle

    Product 1.3 Working principle Here are diagrams below to present the constituents and refrigerant flow of the system. R32: LSQWRF35VM/NhA-M ◆...
  • Page 11 Product R32: LSQWRF60VM/NhA-M ◆...

  • Page 12: Technical Parameters

    1.4.1 Electrical parameters Electrical data table Compressor Model Power supply MRC (A) NRC (A) NRC (A) quantity quantity 380V-415V AC LSQWRF35VM/NhA-M 19.2 0.70 3Ph 50Hz 380V-415V AC LSQWRF60VM/NhA-M 32.9 1.28 3Ph 50Hz Notes: (a) MRC: maximum running current (A) (b) NRC: nominal running current (A)

  • Page 13: Performance Parameters

    1.4.2 Performance parameters Model LSQWRF35VM/NaA-M LSQWRF60VM/NaA-M Cooling capacity Heating capacity Rated cooling power 12.4 21.9 Rated heating power 10.8 20.2 Sound level dB(A) Power supply 380–415V AC 3Ph 50Hz The microcomputer implementing fully automatic control, displaying Operation control the operation state and giving an alarm High-pressure and low-pressure safety cut-out, high-discharge temperature cutout, freeze protection, overflow control, phase safety Safety controls...
  • Page 14 Model LSQWRF35VM/NhA-M LSQWRF60VM/NhA-M Cooling capacity Heating capacity Rated cooling power 11.7 20.8 Rated heating power 10.6 19.9 Sound level dB(A) Power supply 380–415V AC 3Ph 50Hz The microcomputer implementing fully automatic control, displaying the Operation control operation state and giving an alarm...

  • Page 15: Scope Of Supply

    1.4.3 Scope of supply Item Heat pump Modules Three-wire control lines (8m) Accessories for the unit XE73-25/G S (Additionally purchased) Electric control cabinet Auxiliary electric heater Power lines Control lines Connecting hose Thermometer Pressure gauge S= standard; O= field-supplied; P= optional...
  • Page 16 Unit Control Unit Control...

  • Page 17: Unit Control

    Unit Control 2 Unit control 2.1 Schematic diagram Input Description: (1) A water flow cutout is used to judge the water flow rate. When the flow rate is too low, it will trip off, and the control board will send this signal to the display and the water pump. Then, the display will tell there is an error, the water pump will stop and the unit will stop or will not start.
  • Page 18 Unit Control (5) An entering water temperature sensor is used to detect the temperature of the entering water which will determine whether to start or stop the compressor and the auxiliary electric heater. When this sensor fails, all compressors of the unit will stop. (6) Defrost temperature sensor is used to detect the liquid tube temperature of fins serving the condenser, which will determine whether to start the fan.

  • Page 19: Operation Flowchart

    Unit Control 2.2 Operation flowchart 2.2.1 Cooling Is system 1 ready to start compressors? Compressor 1 stops. open EXV for cooling mode is in timer control. EXV for cooling mode is reset. Is system 1 ready to stop compressors?

  • Page 20: Heating

    2.2.2 Heating Is system 1 ready to start compressors? open EXV for heating mode is in timer control. EXV for heating mode is reset. Is system 1 ready to stop compressors?

  • Page 21: Key Control Logics

    Unit Control 2.3 Key control logics 2.3.1 Cooling control Freeze protection ◆ For each single unit, when the leaving water temperature is lower than the anti-freezing setpoint, freeze protection will work; when the leaving water temperature go higher than the normal value, freeze protection will be removed.

  • Page 22: Control To The Compressor

    Unit Control 2.3.3 Control to the compressor “First on, first off”/ “first off, first on” control indicates the numbered compressor which is started/ stopped firstly will then be stopped/started firstly. 2.3.4 Control to the fan The fan will start when the unit is turned on and will stop when the compressor is turned off. During defrosting, the fan does not work but will back to working when defrosting exists.

  • Page 23: Introduction To Controller

    Unit Control 2.4 Introduction to controller Please refer to the owner's manual of the controller before use. 2.5 Smart management system 2.5.1 Long-distance monitoring/BMS interface This long-distance monitoring system allows users through a computer to remotely monitor up to 255 variable-frequency modular-type chillers, including turning on/off the units, setting parameters, giving alarms for malfunctions, which is an efficient tool for management of intelligent air conditioning systems for modern buildings.

  • Page 24: Hardware

    From the topological diagram above, the long-distance monitoring system consists of 3 parts: The first part is the BMS and the converter used to convert RS232 signals from the BMS into RS485 signals of the long-distance monitoring network.(it is required only when RS232 is used for the BMS)The second part refers to the communication network including the communication lines and the connected hardware.

  • Page 25: Model Selection Instructions

    Unit Control Notes: (a) When distance between the output of the BMS system or the output of the optoelectronic converter to CN4 of the display panel exceeds 800m, an optoelectronic repeater is required to reinforce signals. (b) The optoelectronic repeater is also required between the CN5 of the display panel and the main board for extending the communication distance.
  • Page 26 Unit Installation Unit Installation...

  • Page 27: Unit Installation

    Unit Installation 3 Unit installation 3.1 Installation flowchart Technical disclosure Material purchase Check on the field conditions Installation of the Connection of the Installation of Piping Electric wiring main unit water system condensate pipes Installation of Pressure test connection components Anti-corrosion and Insulating insulation of pipes...

  • Page 28: Preparations Before Installation

    3.2.1 Precautions for installation WARNING • Installation should be performed by GREE appointed service personnel, or improper installation would lead to unusual opera tion, water leakage, electric shock or fire hazard. • The unit should be installed on the foundation which is capable of supporting the unit, or the unit would fall off or even lead to personal injury.

  • Page 29: Importance Of Installation

    Unit Installation 3.2.2 Importance of installation See the table below for problems occurred frequently and impacts. Typical problems Impact It would lead to harder maintenance, poor Inadequate space for installation ventilation, poor heat exchanging or even abnormal operation. Improper piping of the water system The unit would fail to run normally.

  • Page 30: Installation Instructions

    3.3 Installation instructions 3.3.1 Outline dimensions (unit: mm) LSQWRF35VM/NhA-M Installation hole 1200 Water oulet: G1-1/2 male thread Drain valve Water inlet G1-1/2 male thread 126 121 1340...
  • Page 31 Unit Installation LSQWRF60VM/NhA-M (unit: mm) Installation hole 2060 Water oulet: G2 male thread Water inlet: G2 male thread Drain valve 2200...

  • Page 32: Precautions For Installation

    Unit Installation 3.3.2 Precautions for installation (1) Pipelines and electric lines should be correctly connected. (2) Rubber pads and rubber flexible connectors should be used during installation for noise and vibration reduction. (3) Under subzero climate, when the heat pump runs for cooling, anti-freeze liquid is required. (4) Dedicated lugs should be used for lifting.

  • Page 33: Installation Foundation

    Unit Installation 3.3.5 Installation foundation (1) The installation foundation should be designed by qualified designers. (2) The foundation should be made of cement or steel structure and be capable of supporting the weight of the unit. Additionally, the upper surface should be kept level. It would be better to keep drain grooves around the foundation.

  • Page 34: Placement Of The Main Unit

    Unit Installation 3.3.7 Placement of the main unit (1) Place the unit on the foundation. (2) There should be no clearance between the foundation and the baseboard of the unit. (3) Lift the unit, put the rubber pad on the foundation and then place the unit on the rubber pad. After that, be sure the horizontal slope of the unit can’t exceed 1/1000.
  • Page 35 Unit Installation (8) When the unit runs under the low load requirement, in order to avoid low load protection which would affect the service life of the unit, make sure the water capacity is more than 1/6 of total rated flow rate per hour of each module (for instance, for some project with four modularized LSQWRF60VM/Na-M units, if the rated water flow of each unit is 10.3m /h, then the required capacity of the whole project should be larger than 10.3*4*1/6=6.87m...

  • Page 36: Requirements On Piping

    Unit Installation NOTE Keep the purge valve of the water system open in order to drain the evaporator and condenser completely. 3.4.2 Requirements on piping The piping slope should meet design and construction regulations and the flexible pipe is not allowed to be longer than 150mm.
  • Page 37 Unit Installation (3) Prefabricate pipes 1) Make out the installation drawing which clearly indicates the branch pipes, pipe diameter, reduced pipes, location of valves, installation dimensions etc. Then, prefabricate pipes in accordance this installation drawing. Pipes should be processed with dedicated cutting machine, leaving no burrs at the pipe ends.

  • Page 38: Installation Of The Expansion Tank

    Unit Installation Threads should be processed by the threading machine. Use lead oil and oakum as stuffing materials and remove those outside of the threads after pipes have been installed. Threads should be clean and at least 90% threads should be intact. Two or three spirals of threads shoud be exposed at the connection joint after installation without any exposed stuffing.

  • Page 39: Installation Of Condensate Pipes

    Unit Installation (8) When the water tank is or higher than 1500mm, it should have ladders both inside and outside of the water tank. When the water tank is or higher than 1800mm, it should have two glass gauges to indicate the water level.
  • Page 40 Unit Installation When the three-way valve is used for the condensate pipe, its straight two connectors should be kept at the same level as shown in the figure below. Tee joint When there are several indoor units at the same floor, their condensate is usually drained out through one main pipe.

  • Page 41: Electrical Connection

    3.5.2 External connection Follow the wiring diagrams below to complete control output connections. ■ LSQWRF35VM/NhA-M Note: the output control lines of the AC contactors for the running indicator, water pump 1, water pump 2, auxiliary electric heater 1, auxiliary electric heater 2 can be wired to the corresponding wiring board of all units, while those for the error indicator and external passive contact switch should be wired to the corresponding wiring board of all units.
  • Page 42 When external passive contact switch is available for multiple units, the wiring board 9 and 10 of each unit should be wired to the dry contact A and B. Unit 2 Unit 16 Unit 1 When it is required to display errors of several units, the wiring terminals (3, 4) of each unit should be wired to the wiring terminals HL2 (C, D) of the error indicator.
  • Page 43 Unit Installation Unit 1~16 When multiple modules have direct control over one water pump, its AC contactor is wired to an AC contactor (KM1 or KM2) of any one module. Unit 1 Unit 2 Unit 3 When one auxiliary electric heater serves more than one modules, its wiring terminals 11 and 12 are connected to terminals G and H respectively of an AC contactor marked with KM3.
  • Page 44 Unit Installation ■ LSQWRF60VM/NhA-M External passive contact switch error indicating running indicating Note: the output control lines of the AC contactors for the auxiliary electric heater 1, auxiliary electric heater 2 can be wired to the corresponding wiring board of all units, while those for the error indicator and external passive contact switch should be wired to the corresponding wiring board of all units.

  • Page 45: Specification Of Power Supply

    40°C. If the working condition changes, they should be modified according to the related applicable standard. 3.5.4 Wiring of the electric control cabinet (1) LSQWRF35VM/NhA-M 1. If the unit is a heat pump chiller with an auxiliary electric heater, it is required to do wiring in accordance with this diagram.
  • Page 46 Unit Installation (2) LSQWRF60VM/NhA-M HL3 6 Water pump...

  • Page 47: Field Wiring

    3.5.5 Field wiring Follow the safety codes below. (1) All wiring shall comply with applicable codes and engineering requirements. (2) All field wiring shall be performed by qualified electricians. (3) Never perform wiring before the power supply is cut off. (4) Any damage caused by the improper external wiring shall be at the installer’s expense.
  • Page 48 Unit Installation The cable should be fixed by these three fasteners. The thru-hole after wiring should be sealed to prevent insects from entering. LSQWRF60VM/NhA-M (4) The unit shall be grounded reliably and never connect the ground wire with the gas fuel pipe, water pipe, lightening rod or telephone line.

  • Page 49: Networking And Wiring Between Units

    3.5.6 Networking and wiring between units (1) LSQWRF35VM/NhA-M...
  • Page 50 Unit Installation (2) LSQWF65VM/NaA-M...

  • Page 51: Jumpers

    • Install the remote monitoring software at the PC. • Based on GREE provided Modbus protocol, the user can do second development to this protocol. • Note: those enclosed by the dotted lines indicate the remote monitoring equipment. When the quantity of the display panel exceeds 30 or length of the communication line exceeds 800m, extra photoelectric relay is required.
  • Page 52 Test Operation, Troubleshooting and Maintenance Test Operation, Troubleshooting and Maintenance...

  • Page 53: Test Operation, Troubleshooting And Maintenance

    4 Test operation, troubleshooting and maintenance 4.1 Commissioning 4.1.1 Flowchart of commissioning Preparation Check on installation Check on the unit Commissioning 4.1.2 Safety precautions for commissioning WARNING • Safety measures should be taken during indoor operation. Any commissioning and service personnel should grasp and observe safety regulations of construction work.

  • Page 54: Check For Initial Run

    Test Operation, Troubleshooting and Maintenance Check the water system ◆ (1) Is the water flow direction in the condenser and evaporator correct? (2) Are the chilled water pipes clean? Is there any foreign matter trapped in the joints? Is the water quality satisfactory? (3) Is the insulation of the chilled water pipes in good condition? (4) Are the manometer and thermometer connected correctly (Is the manometer at a right angle with...
  • Page 55 Test Operation, Troubleshooting and Maintenance Check for a single unit ◆ (1) Commission one single unit first and stop all others. (2) Do the compressor, fans and the 4-way valve run normally without any unusual noise? (3) Is the voltage phase difference lower than ±2%? (4) Voltage phase difference =(phase difference between the max and average voltage)/(average voltage)×100%.

  • Page 56: Troubleshooting

    Test Operation, Troubleshooting and Maintenance 4.2 Troubleshooting 4.2.1 Diagnostics Diagnostic name Affects signal source Description When the pressure is too high or the current exceeds the setpoint, the corresponding compressor will stop and the indicating LED on the High pressure protection High pressure cutout control panel will light on and the error information will be displayed...
  • Page 57 Diagnostic name Affects signal source Description When the single unit fails to receive Communication fault Main board signals from the control panel, it will automatically be shut off. When phase loss/reversal occurs, Phase loss/reversal Phase protector the phase protector will cut off the protection power supply to the main board.

  • Page 58: Flow Chart Of Troubleshooting

    Test Operation, Troubleshooting and Maintenance 4.2.2 Flow chart of troubleshooting (1) High pressure protection High pressure protection Does the fan stop Check the fan. running or run reversely? Replace the coils of the Does the electric electric expansion valve expansion valve work or even the main body .
  • Page 59 Test Operation, Troubleshooting and Maintenance (2) Low pressure protection Low pressure protection Does the water pump Check the water pump. not started or the flow is inadequate ? Replace the coils of the Does the electric electric expansion valve expansion valve work or even the main body normally ? Is the pressure switch...
  • Page 60 Test Operation, Troubleshooting and Maintenance (3) High discharge protection High discharge temp protection Does the discharge Is the resistance of the Replace the discharge temperature go to temperature sensor temperature sensor. 125°C? normal? Replace the damaged main board. Replace the coils of the Does the electric electric expansion valve expansion valve work...
  • Page 61 Test Operation, Troubleshooting and Maintenance (4) Phase protection Phase loss/reversal protection Is the phase sequence Adjust the wiring. incorrect? Is there phase loss? Check the power supply. Replace the phase Is the phase protector damaged ? protector. If this occurs frequently, the Does the controller main board should be alarm incorrectly?
  • Page 62 Test Operation, Troubleshooting and Maintenance (5) Water flow switch protection Water flow switch protection Does the water pump Start the water pump. not start? Is the the flow switch not Install the flow switch or installed or installed check the installation. improperly? Is the flow switch faulty? Maintain the flow switch.
  • Page 63 Test Operation, Troubleshooting and Maintenance (6) Temperature sensor error Temperature sensor error Is the sensor plug Check the direction of the placed properly into the sensor probe. main board? Remove the sensor and Replace the temperature see if its voltage is sensor.

  • Page 64: Power Distribution

    4.3 Power distribution 4.3.1 Power distribution logic 380V AC 3Ph Main board Protection conditions: phase loss or reversal of the power input for the phase protector. Action result: No power for the controller and ON/OFF operation is failed. Handling: interchange the wiring sequence and check if the voltage of the 3-phase power supply is normal.

  • Page 65: Main Board

    4.3.3 Main board 21 22 23 Name Water flow switch System 2 low-pressure switch for heating System 1 high-pressure switch System 1 low-pressure switch for heating External passive contact switch Preserved Preserved System 1 low-pressure switch for cooling System 1 discharge temp. sensor System 1 defrosting temp.
  • Page 66 Name Preserved System 2 defrosting temp. sensor System 2 discharge temp. sensor System 1 shell-and-tube inlet temp. sensor System 2 shell-and-tube inlet temp. sensor System 1 suction temp. sensor System 2 suction temp. sensor Outdoor ambient temp. sensor System 1 high pressure sensor System 2 shell-and-tube outlet temp.

  • Page 67: Replacement Of Main Parts

    4.4 Replacement of main parts 4.4.1 Brief introduction Image Name Function It is the power source of the whole system, used to compress low-pressure and Compressor low-temperature refrigerant to be high-pressure and high- temperature gas. It is intended to separate Vapor-liquid separator refrigeration oil from liquid refrigerant.

  • Page 68: Replacement Instructions

    4.4.2 Replacement instructions (1) LSQWRF35VM/NhA-M Replacement of the compressor Note: be sure there is no refrigerant inside the system and power supply has been cut off before replacement. Steps Image Instructions • Remove screws at the front pane. • Loosened screws should be put together to avoid loss.
  • Page 69 Test Operation, Troubleshooting and Maintenance Replacement of the compressor Note: be sure there is no refrigerant inside the system and power supply has been cut off before replacement. Steps Image Instructions • Loosen screws at feet of the 4. Loosen screws compressor with a adjustable at feet of the or box spanner.
  • Page 70 Test Operation, Troubleshooting and Maintenance Replacement of the compressor Note: be sure there is no refrigerant inside the system and power supply has been cut off before replacement. Steps Image Instructions 7. Put back the Put back front panels and front panels.
  • Page 71 Test Operation, Troubleshooting and Maintenance Replacement of the 4–way valve Note: be sure power supply has been cut off and refrigerant has been reclaimed before replacement. Steps Image Instructions 3. Record the direction • Remember installation direction of the 4–way before replacement.
  • Page 72 Test Operation, Troubleshooting and Maintenance Replacement of the electric expansion valve Note: check the whole system, pipelines and electric lines, cut off power supply and reclaim refrigerant before replacement. Steps Image Instructions 1. Reclaim • Cut off power supply of the unit. refrigerant and •...
  • Page 73 Test Operation, Troubleshooting and Maintenance Replacement of the electric expansion valve Note: check the whole system, pipelines and electric lines, cut off power supply and reclaim refrigerant before replacement. Steps Image Instructions • Solder pipes. • Do charge nitrogen during soldering; 5.
  • Page 74 Test Operation, Troubleshooting and Maintenance Replacement of the vapor-liquid separator Note: properly reclaim refrigerant, prepare tools and keep good ventilation. Steps Image Instructions 2. De-solder De-solder connection pipes with a connection pipes. soldering gun. 3. Take out the Loosen fixed screws and take out the vapor-liquid vapor-liquid separator.
  • Page 75 Test Operation, Troubleshooting and Maintenance Replacement of the vapor-liquid separator Note: properly reclaim refrigerant, prepare tools and keep good ventilation. Steps Image Instructions 5. Replace it with Install the new vapor-liquid separator a new one. as per reverse steps as stated above. 6.When it is required to add lubricating oil,...
  • Page 76 (2) LSQWRF60VM/NhA-M Replacement of the compressor Note: be sure there is no refrigerant inside the system and power supply has been cut off before replacement. Steps Image Instructions • Remove screws at the front panel. • Loosened screws should be put together to avoid loss.
  • Page 77 Test Operation, Troubleshooting and Maintenance Replacement of the compressor Note: be sure there is no refrigerant inside the system and power supply has been cut off before replacement. Steps Image Instructions • During replacement, care must be taken to not damage rubber pads. •...
  • Page 78 Test Operation, Troubleshooting and Maintenance Replacement of the 4–way valve Note: be sure there is no refrigerant inside the system and power supply has been cut off before replacement. Steps Image Instructions • Remove screws at the front panel. • Loosened screws should be put together to avoid loss.
  • Page 79 Test Operation, Troubleshooting and Maintenance Replacement of the 4–way valve Note: be sure there is no refrigerant inside the system and power supply has been cut off before replacement. Steps Image Instructions • Keep the vacuum degree to -1.0bar. 4. Vacuum •...
  • Page 80 Test Operation, Troubleshooting and Maintenance Replacement of the electric expansion valve Note: be sure there is no refrigerant inside the system and power supply has been cut off before replacement. Steps Image Instructions 4. Take out the main Take out the main body of the electric body.
  • Page 81 Note: there would be trapped oil inside the compressor during replacement, which would not affect its reliability but increase resistance to the rotors and then consume more power. In order to expel it, it would be better to install another valve at the lower point of the suction line. After that, run the compressor for ten minutes and then open this valve until no oil comes out.
  • Page 82 Test Operation, Troubleshooting and Maintenance Replacement of the 4–way valve Note: be sure power supply has been cut off and refrigerant has been reclaimed before replacement. Steps Image Instructions • Do use the one with the same model for replacement. The one with different model can be used after being approved by relative technicians.
  • Page 83 Test Operation, Troubleshooting and Maintenance Replacement of the electric expansion valve Note: check the whole system, pipelines and electric lines, cut off power supply and reclaim refrigerant before replacement. Steps Image Instructions • Take out coils. • Loosen screws and take out pipe 2.
  • Page 84 Test Operation, Troubleshooting and Maintenance Replacement of the electric expansion valve Note: check the whole system, pipelines and electric lines, cut off power supply and reclaim refrigerant before replacement. Steps Image Instructions • Solder pipes. • Do charge nitrogen during soldering. 5.
  • Page 85 Test Operation, Troubleshooting and Maintenance Replacement of vapor-liquid separator Note: properly reclaim refrigerant, prepare tools and keep good ventilation. Steps Image Instructions 2. De-solder De-solder connection pipes with a connection pipes. soldering gun. 3. Take out the Loosen fixed screws and take out the vapor-liquid vapor-liquid separator.
  • Page 86 Test Operation, Troubleshooting and Maintenance Replacement of vapor-liquid separator Note: properly reclaim refrigerant, prepare tools and keep good ventilation. Steps Image Instructions 6.When lubricating Inlet oil is needed, you need to charge it Charge lubrication oil from the inlet of from the inlet of the vapor-liquid separator and then do the vapor-liquid...

  • Page 87: Routine Maintenance

    Test Operation, Troubleshooting and Maintenance 4.5 Routine maintenance 4.5.1 Repairs to refrigerant leakage When soapsuds often used to detect leakage of a refrigeration system is applied to possible leakage points. If there are bubbles, leaks occur and need repairs by brazing. If soapsuds does not work, an electronic leak detector is an alternative.

  • Page 88: Air Removal

    Test Operation, Troubleshooting and Maintenance (2) Recharge refrigerant Low-pressure gauge High-pressure gauge Refrigerant tank Manifold gauge Hose Hose Charging process Excessive or deficient refrigerant may cause abnormal operation, malfunction or damage to a compressor, so charge volume must comply with the requirements on the unit nameplate which have been decided in strict tests;...

  • Page 89: Exploded Views And Part Lists

    4.6 Exploded views and part lists ■LSQWRF35VM/NhA-M...
  • Page 90 ■LSQWRF35VM/NhA-M (EL01500770) part list Name of part Quantiy Rear Grill Coping Upper Cover Plate (back) Top Cover (front) Axial Flow Fan Brushless DC Motor Motor Support Sub-Assy Condenser Assy Pressure Sensor Magnet Coil Rear Grill Dry Evaporator 4-way Valve Pressure Protect Switch...
  • Page 91 Name of part Quantiy Electric Box Assy Terminal board Reactor One Way Valve Filter Handle Sensor Sub-assy Temperature Sensor Support Right Side Plate Radiator Radiator Ring For Flow Diversion Nesting Of The Axial Flow Fan Axial Flow Fan Assy...
  • Page 92 ■LSQWRF60M/NhA-M ■LSQWRF60VM/NhA-M (EL01500830) part list Name of part Quantiy Rear Grill Coping Axial Flow Fan Ring For Flow Diversion Brushless DC Motor Condenser Assy (Left) Rear Grill 1 Pressure Sensor Temp Sensor Sleeving Condenser Assy (Right) Chiller barrel...
  • Page 93 Name of part Quantiy Filter 4-way Valve Magnet Coil Pressure Protect Switch Pressure Protect Switch Pressure Sensor Pressure Protect Switch 4-way Valve Fitting Pressure Protect Switch Temp Sensor Sleeving Pressure Protect Switch Pressure Protect Switch Right Side Plate Filter Water Flow Switch Electric Expand Valve Fitting Electrical Heater (Compressor) Gas-liquid Separator...
  • Page 94 Name of part Quantiy One Way Valve Left Side Plate Sensor Sub-assy...

  • Page 95: Maintenance

    4.7 Maintenance 4.7.1 Requirements for maintenance The unit has undergone a series of strict tests prior to delivery to ensure qualified performance, however, in order to keep reliable performance and extend its service life, the unit should be maintained routinely and periodically by the qualified service personnel. Routine maintenance items Is there any unusual noise and vibration? Is there any unusual noise and vibration for the compressor in operation? Is there any unusual smell?
  • Page 96 Even though water quality is under strict control, calcium oxide or other minerals will gradually accumulate on the surface of the evaporator. Then, it will reduce the heat exchange efficiency of the evaporator and consequently lead to poor performance of the unit. Therefore, the pipe system should be cleaned periodically.

  • Page 97: Freeze Protection In Winter

    (1) Cut off the power supply. (2) Clean with high-pressure air fins against the direction of the inlet air, or clean with high-pressure water fins at the direction upright with that of the fins but care must be taken to control the water pressure to prevent the fins from being pulled down and protect each electric element.
  • Page 98 Add: West Jinji Rd, Qianshan, Zhuhai,Guangdong, China, 519070 Tel: (+86-756) 8522218 Fax: (+86-756) 8669426 E-mail: global@cn.gree.com www.gree.com For continuous improvement in the products, Gree reserves the right to modify the product specification and appearance in this manual without notice and without incurring any obligation. JF00304157...

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