Page 1 GMV6 DC Inverter VRF Units (GC202104-I) Capacity: 22.4kW~272.0kW Rated Frequency: 60Hz Operation Range: Cooling: -15~48°C Heating: -25~24°C...
Page 2: Table Of Contents
Contents Preface ..........................1 Safety Instructions ....................... 1 Chapter 1 Product ........................ 2 1 Unit List ..........................2 2 Parameters ........................3 3 The Range of Production Working Temperature ............. 10 Chapter 2 Commissioning ....................11 1 Commissioning Process ....................11 2 Safety Requirements ......................
Page 3: Preface
Thank you for purchasing GMV6 DC Inverter VRF Units. For correct operation, please read this manual carefully. This manual applies to GMV6 series VRF units. It clarifies the safety requirements, basic principles and implementation methods in engineering commissioning, troubleshooting, and after-sales maintenance.
Page 4: Chapter 1 Product
Gree GMV6 DC Inverter VRF Units Service Manual Chapter 1 Product 1 Unit List 1.1 Basic Modules Product Code Model Power External view CN851W3440 GMV-224WM/G-U 440~460V 3~ 60Hz CN851W3430 GMV-280WM/G-U 440~460V 3~ 60Hz CN851W3330 GMV-335WM/G-U 440~460V 3~ 60Hz CN851W3380 GMV-400WM/G-U...
Page 5: Parameters
Gree GMV6 DC Inverter VRF Units Service Manual 2 Parameters 2.1 Parameters of Basic Modules Model GMV-224WM/G-U GMV-280WM/G-U GMV-335WM/G-U GMV-400WM/G-U GMV-450WM/G-U Product Code CN851W3440 CN851W3430 CN851W3330 CN851W3380 CN851W3400 Cooling capacity 22.4 28.0 33.5 40.0 45.0 Heating capacity 25.0 31.5 37.5 45.0...
Page 6 Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-504WM/G-U GMV-560WM/G-U GMV-615WM/G-U GMV-680WM/G-U Rated current 25.0 36.2 38.0 40.9 Compressor type Inverter scroll Inverter scroll Inverter scroll Inverter scroll Compressor function Compressor quantity Refrigeration oil No. FV68H FV68H FV68H FV68H...
Page 7 Gree GMV6 DC Inverter VRF Units Service Manual 2.2 Parameters of Combined Modules Model GMV-735WM/G-U GMV-785WM/G-U GMV-839WM/G-U GMV-895WM/G-U 12+14 12+16 12+18 10+22 Combination mode GMV-335WM/G-U+ GMV-335WM/G-U+ GMV-335WM/G-U+ GMV-280WM/G-U+ GMV-400WM/G-U GMV-450WM/G-U GMV-504WM/G-U GMV-615WM/G-U Cooling capacity 73.5 78.5 83.9 89.5 Heating capacity 82.5...
Page 8 Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-950WM/G-U GMV-1015WM/G-U GMV-1064WM/G-U GMV-1119WM/G-U Liquid pipe Φ19.05 Φ19.05 Φ19.05 Φ19.05 Outline dimensions 930×775×1690+ 1340×775×1690+ 1340×775×1690+ 1340×775×1690+ (W × D × H) 1340×775×1690 1340×775×1690 1340×775×1690 1340×775×1690 Packing dimensions 1000×830×1855+ 1400×830×1855+ 1400×830×1855+ 1400×830×1855+ (W ×...
Page 9 Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-1399WM/G-U GMV-1455WM/G-U GMV-1510WM/G-U GMV-1565WM/G-U Rated current 21+25+36.2 20+36.2+38 20+38+38 21+38+38 Refrigerant type R410A R410A R410A R410A Refrigerant charge 5.7+8+8 5.5+8+8.3 5.5+8.3+8.3 5.7+8.3+8.3 Maximum drive IDU unit Gas pipe Φ41.3 Φ41.3 Φ41.3 Φ41.3...
Page 10 Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-1845WM/G-U GMV-1910WM/G-U GMV-1975WM/G-U GMV-2040WM/G-U Noise (sound pressure dB(A) level) Power 440~460V 3~ 60Hz 440~460V 3~ 60Hz 440~460V 3~ 60Hz 440~460V 3~ 60Hz Cooling power input 15.80+15.80+15.80 15.80+15.80+19.40 15.80+19.40+19.40 19.40+19.40+19.40 Heating power input 16.90+16.90+16.90...
Page 11 Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-2069WM/G-U GMV-2129WM/G-U GMV-2190WM/G-U GMV-2245WM/G-U Net weight 235+300+355+355 295+300+355+355 295+355+355+355 295+355+355+355 Gross weight 245+315+370+370 310+315+370+370 310+370+370+370 310+370+370+370 Model GMV-2295WM/G-U GMV-2355WM/G-U GMV-2414WM/G-U GMV-2470WM/G-U 20+20+20+22 20+20+22+22 18+22+22+24 20+22+22+24 GMV-560WM/G-U+ GMV-560WM/G-U+ GMV-504WM/G-U+ GMV-560WM/G-U+ Combination mode...
Page 12: The Range Of Production Working Temperature
Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-2525WM/G-U GMV-2590WM/G-U GMV-2655WM/G-U GMV-2720WM/G-U Heating current input 25.0+25.0+25.0+28.8 25.0+25.0+28.8+28.8 25.0+28.8+28.8+28.8 28.8+28.8+28.8+28.8 25.50+25.50+25.50+2 25.50+25.50+28.50+2 25.50+28.50+28.50+ 28.50+28.50+28.50+28 Rated power input 8.50 8.50 28.50 Rated current 38+38+38+40.9 38+38+40.9+40.9 38+40.9+40.9+40.9 40.9+40.9+40.9+40.9 Refrigerant type R410A R410A...
Page 13: Chapter 2 Commissioning
Gree GMV6 DC Inverter VRF Units Service Manual Chapter 2 Commissioning Before performing operations (such as commissioning, maintenance, and repair) on the device, you need to shut down the unit and cut off the power, and use a relevant instrument to ensure that the voltage at the power input terminal is zero, and the power indicator on the main board is off.
Page 14: Unit Commissioning
Gree GMV6 DC Inverter VRF Units Service Manual 3 Unit Commissioning 3.1 Preparation 3.1.1 Tools Name Picture Screwdrivers Spanner Hex key Pincers Vacuum pump Electronic balance Pressure gauge Multimeter...
Page 15 Gree GMV6 DC Inverter VRF Units Service Manual 3.1.2 Files To record the installation and commissioning of the unit, all the following documents need to be prepared: minutes of the pre-commissioning scheme determining meeting, commissioning personnel record form, pre-commissioning checklist, commissioning data record form, and commissioning report.
Page 16 Gree GMV6 DC Inverter VRF Units Service Manual Commissioning data record form Project name: Unit model: Debugger: Date: Rated capacity of Rated capacity of Total length of the the outdoor unit the indoor unit refrigerant pipe (kW): (kW): (m): Maximum drop...
Page 17 Gree GMV6 DC Inverter VRF Units Service Manual 3.1.3 Checking Items not complying with installation specifications need to be recorded in time as analysis basis for the test of the refrigerating system. Checklist before commissioning Checklist Before GMV6 Commissioning Category...
Page 18 Gree GMV6 DC Inverter VRF Units Service Manual Checklist Before GMV6 Commissioning Category Item Reference Value Qualified Inspector Is the stop valve of each module — open to the maximum opening? At this time, the high and low pressures of the system...
Page 19 Gree GMV6 DC Inverter VRF Units Service Manual Checklist Before GMV6 Commissioning Category Item Reference Value Qualified Inspector Does the communication cable material meet the unit design — requirements? Is the communication connection between outdoor unit modules — correct? Is the DIP switch of the master unit —...
Page 20 Gree GMV6 DC Inverter VRF Units Service Manual (4) Debugging must be carried out by a professional or under the guidance of a professional. Do not debug the air conditioning unit by yourself. (5) All scattered objects, especially metal chips, wire ends and clamps, should be removed from the body.
Page 21 Gree GMV6 DC Inverter VRF Units Service Manual (2) Install proprietary software to conduct the debugging through PC. Indoor and outdoor units’ parameters displayed simultaneously through PC software. (3) Use multi-functional debugger. (As for the detailed operation method for debugging, please refer to corresponding instruction manual.)
Page 22 Gree GMV6 DC Inverter VRF Units Service Manual Instruction for each stage progress at the time of debugging Deubugging Progress code Status code — code LED1 LED2 LED3 Meaning Progress Display Display Display Code Code Code status status status ××/ The...
Page 23 Gree GMV6 DC Inverter VRF Units Service Manual Instruction for each stage progress at the time of debugging Deubugging Progress code Status code — code LED1 LED2 LED3 Meaning Progress Display Display Display Code Code Code status status status 11_ reserved —...
Page 24 Gree GMV6 DC Inverter VRF Units Service Manual 3.2.3 Debugging Through the Main Board of Outdoor Unit When conducting the debugging through the main board of outdoor unit, the main board has the following debugging operation functions. Step 1: Cover all the front panels of the outdoor unit and open the debugging window of each basic module.
Page 25 Gree GMV6 DC Inverter VRF Units Service Manual After 30s of display, the automatic display is as follows; if press SW3 button within 30s, the display is as follows. The unit automatically enters the next step of debugging: Debugging code...
Page 26 Gree GMV6 DC Inverter VRF Units Service Manual Debugging code Progress code Status code — LED1 LED2 LED3 Meaning Progress Display Display Display Code Code Code status status status The system has detected “communication malfunction between main control and inverter compressor driver”.
Page 27 Gree GMV6 DC Inverter VRF Units Service Manual Debugging code Progress code Status code — LED1 LED2 LED3 Meaning Progress Display Display Display Code Code Code status status status The system detected 07_indoor unit that there’s no fault for components indoor unit’s parts.
Page 28 Gree GMV6 DC Inverter VRF Units Service Manual If there is no refrigerant in the system or the amount of refrigerant does not meet the requirements for starting operation, the unit will display U4 “Refrigerant-lacking protection”, as shown below. The unit will enter into the next step.
Page 29 Gree GMV6 DC Inverter VRF Units Service Manual Debugging code Progress code Status code — LED1 LED2 LED3 Meaning Progress Display Display Display Code Code status status status 12_reserved function — Step 16: After the unit debugging method is confirmed, the system automatically selects cooling or heating mode according to the ambient temperature.
Page 30 Step 1: Install the commissioning software. Install the commissioning software on a PC, and connect the monitoring communication cable. (For details, see Gree Debugger.) Step 2: Cover all the front panels of the outdoor unit. Step 3: Set the master module.
Page 31 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Display status Function code Current process Display status Current status Display status Blinks Blinks Press the SW1 up button and the SW2 down button to select the corresponding basic module: 00 means all modules, 01~04 means module 1 to module 4.
Page 32 Gree GMV6 DC Inverter VRF Units Service Manual Step 7: Click "Start" to enter the commissioning function Click "Start" to enter the commissioning function and the software automatically performs commissioning. " " indicates that commissioning is being performed on the phase and "...
Page 33 Gree GMV6 DC Inverter VRF Units Service Manual For the phase with "OK" displayed, a manual confirmation is required for entering the next commissioning step. In processes "3 Confirm number of outdoor basic modules" and "4 Confirm the number of IDUs", if the number of online units is consistent with the actual number, click Confirm or wait for 30 seconds to go to the next process.
Page 34 Gree GMV6 DC Inverter VRF Units Service Manual In step “8 Compressor preheating confirmation”, the current preheat time is directly displayed, as shown in the red box in the figure below. If the system currently detects that all the basic modules have...
Page 35 Gree GMV6 DC Inverter VRF Units Service Manual " " indicates that commissioning is not passed on the phase and troubleshooting is required (after troubleshooting, the unit automatically enters the next step if no "OK" exists or click "OK" to enter the next step).
Page 36 Gree GMV6 DC Inverter VRF Units Service Manual During commissioning, click "Stop" to stop commissioning and then click "Start" to continue commissioning till commissioning ends. "Back" and "Skip" are provided in "10 ODU valves check before startup". When an exception occurs in step 10, click "Back" to return to step 9 and then click "OK" in step 9 to perform commissioning again for step 10.
Page 37 Gree GMV6 DC Inverter VRF Units Service Manual In step "11 Select charging method", the system automatically selects manual or auto charging mode. You can directly choose manual charging. If no operation is performed within 3 minutes, manual charging is automatically entered.
Page 38 Gree GMV6 DC Inverter VRF Units Service Manual In step "13 Refrigerant charging running" is divided into trial running in manual charging cooling mode or manual charging heating mode. The system automatically determines and enables indoor unit cooling or forcibly enables indoor unit heating. When the system runs for 60 minutes without exception, it determines that the refrigerant is normal, the unit is shut down, and the commissioning is completed.
Page 39 Gree GMV6 DC Inverter VRF Units Service Manual During commissioning, users must listen to the operating sound of outdoor and indoor fans and compressors to check for exceptions. 3.2.5 Unit Commissioning by Using Multi-functional Debugger Step 1: Connect multi-functional debugger. For details, see the user manual of multi-functional debugger.
Page 40 Gree GMV6 DC Inverter VRF Units Service Manual Step 5: During commissioning, multi-functional debugger shows the current process (step). In steps 3, 4, 8, and 12, click Confirm to go to the next step. In step 10, click Skip or Back. In steps 3, 4, 5, 6, and 7, you can view the details.
Page 41 Gree GMV6 DC Inverter VRF Units Service Manual 3.2.7 Reference Values of Unit Normal Operation Parameters (Commissioning Check) Debugging Parameter Reference Value for DC Inverter VRF Unit Debugging item Parameter name Unit Reference value Remark ℃ Outdoor ambient — —...
Page 42 Gree GMV6 DC Inverter VRF Units Service Manual Debugging Parameter Reference Value for DC Inverter VRF Unit Debugging item Parameter name Unit Reference value Remark ● When the unit operating in the cooling mode at the ambient temperature of 25~35℃（77~95℉）, the system low pressure value is 0~8℃...
Page 43: Unit Function Settings
Gree GMV6 DC Inverter VRF Units Service Manual 4 Unit Function Settings 4.1 DIP Switch Settings Master/ Capacity DIP switch Centralized controller Slave unit Code Name Meaning Default Setting Remarks Capacity DIP Defines the rated Depending on The DIP switch is set by the...
Page 44 Gree GMV6 DC Inverter VRF Units Service Manual Address No. DIP1 DIP2 DIP3 DIP4 DIP5 × × × × × × × × × × × × × × × DIP switch at the ON end indicates 0; ① DIP switch at the other end indicates 1;...
Page 45 Gree GMV6 DC Inverter VRF Units Service Manual 4.1.4 DIP Switch Examples (1) DIP switch position description DIP switch at the ON end indicates 0; DIP switch at the other end indicates 1. The white lever is DIP switch position.
Page 46 Gree GMV6 DC Inverter VRF Units Service Manual 4.2.2 Function Description Default Setting Function Function Name Description Remarks Code Code Meaning This function is automatically started during maintenance. Based on the system pressure change, this This function can Refrigerant recycle —...
Page 47 Gree GMV6 DC Inverter VRF Units Service Manual 4.2.3 Function Operations Before setting every function, perform the following steps to select the function you want to set. The following premise steps will not be repeated. Premise steps for function setting: Step 1: Open the commissioning window on the main board of the master unit.
Page 48 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Function Name Function Display Current Display Current Display code status process status status status Blinks Blinks Outdoor unit silence Cooling/heating of the entire Blinks Blinks system Blinks Blinks Refrigerant recycle...
Page 49 Gree GMV6 DC Inverter VRF Units Service Manual pipeline refrigerant recycle. Refrigerant Recycle Refrigerant Recycle Mode Name Remarks Mode Code This mode is selected when an indoor unit is faulty, Indoor unit pipeline refrigerant and the refrigerant in the indoor unit pipeline needs recycle to be recycled to the outdoor unit.
Page 50 Gree GMV6 DC Inverter VRF Units Service Manual pipe stop valve of the module in emergency status, and then select 02 in step 2 to enter refrigerant recycle of the basic module, as shown below: LED1 LED2 LED3 Function code...
Page 51 Gree GMV6 DC Inverter VRF Units Service Manual Step 3: After selecting the mode, press the SW3 confirm button. The master module displays as follows: LED1 LED2 LED3 Current Function code Display status Display status Current status Display status process/mode Press the SW4 back button on the master module to return to the previous process or exit the function setting status.
Page 52 Gree GMV6 DC Inverter VRF Units Service Manual Step 1: Enter A7 outdoor silence mode, and ensure that the master module displays as follows: LED1 LED2 LED3 Silence mode Function code Display status Display status Current status Display status code...
Page 53 Gree GMV6 DC Inverter VRF Units Service Manual Setting steps: Step 1: Enter A8 after-sales vacuum pumping mode, and ensure that the master module displays as follows: LED1 LED2 LED3 Function code Display status Current process Display status Current status...
Page 54 Gree GMV6 DC Inverter VRF Units Service Manual current screen and the unit will resume displaying the current status. (During setting, press SW4 to return to the previous process. If the setting is completed, press SW4 to resume the unit to the current normal working status.)
Page 55 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Current Function code Display status Display status Current status Display status process/mode Blinks Blinks Blinks Blinks Blinks Blinks Step 3: After selecting the value, press the SW3 confirm button. The master module displays as...
Page 56 Gree GMV6 DC Inverter VRF Units Service Manual When basic modules are set separately, the static pressure value of each module can be different; when the modules are set uniformly, the static pressure value of each module remains the same. When a static pressure value is set in either of the two modes, the previous mode setting limit is automatically released.
Page 57 Gree GMV6 DC Inverter VRF Units Service Manual on again. The default value is 00. 4.2.3.10 qJ One-button Drainage Code Meaning One-button drainage Non-one-button drainage Setting steps: Enter the function setting. The master unit displays as follows by default: LED1...
Page 58 Gree GMV6 DC Inverter VRF Units Service Manual emergency operation status. LED1 LED2 LED3 Description Function Display Current Display Current Display code status process status status status Compressors 1 and 2 run Blinks Blinks normally. The operation of compressor 1 is...
Page 59 Gree GMV6 DC Inverter VRF Units Service Manual follows: LED1 LED2 LED3 Function code Display status Current process Display status Current status Display status Blinks Blinks Press the SW1 up button and the SW2 down button to select the corresponding compressor emergency operation status.
Page 60 Gree GMV6 DC Inverter VRF Units Service Manual 4.2.3.13 CA Module Failure Emergency Operation This function is after-sales emergency setting when a module works abnormally. It shields the abnormal module in a short time to ensure the emergency operation of other modules.
Page 61 Gree GMV6 DC Inverter VRF Units Service Manual The default status is 00. ③ The system cannot run continuously for more than 48 hours in module emergency operation ④ status. If it exceeds 48 hours, the entire system is stopped, and the indoor unit displays the "Ad"...
Page 62 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Function code Display status Current process Display status Current status Display status Blinks Blinks Press the SW1 up button and the SW2 down button to select the corresponding low pressure control mode.
Page 63 Gree GMV6 DC Inverter VRF Units Service Manual display normal working status: LED1 LED2 LED3 Function code Display status Current process Display status Current status Display status Blinks Blinks Press the SW1 up button and the SW2 down button to select the corresponding low pressure control mode.
Page 64 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Function code Display status Current process Display status Current status Display status The master unit memorizes this setting and does not clear it even upon power failure and power-on again.
Page 65 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Function code Display status Current process Display status Current status Display status Blinks Blinks Blinks Blinks After selecting the corresponding value, press the SW3 confirm button. The master module displays...
Page 66 Gree GMV6 DC Inverter VRF Units Service Manual in the order of time. Operations: In fault query status, press the SW1 up button and the SW2 down button. LED3 circularly displays the code and address of the faulty module in history in the order of time (at an interval of 1s), and LED2 displays the fault sequence number.
Page 67 Gree GMV6 DC Inverter VRF Units Service Manual faults of the outdoor unit. 4.2.4.2 n7 Parameter Query Press the SW1 up button and the SW2 down button to select parameter query. The master unit displays as follows: LED1 LED2 LED3...
Page 68 Gree GMV6 DC Inverter VRF Units Service Manual Parameter Code Parameter Name Remarks The integer value is used, and the wired controller Current of compressor 3 does not query. The integer value is used, and the wired controller Current of compressor 4 does not query.
Page 69 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Current Function Code Display status Display status Current status Display status process/mode Blinks Blinks Blinks Press the SW3 confirm button on the master unit to confirm the selection. The master unit displays...
Page 70 Gree GMV6 DC Inverter VRF Units Service Manual unit displays as follows: LED1 LED2 LED3 Function Code Display status Current process/mode Display status Current status Display status Blinks Blinks Blinks Press the SW3 confirm button on the master unit to enter the next level of menu. The module displays...
Page 71 Gree GMV6 DC Inverter VRF Units Service Manual ↓ LED1 LED2 LED3 Parameter code Display status Parameter code Display status Parameter code Display status Blinks Blinks ↓ LED1 LED2 LED3 Parameter code Display status Parameter code Display status Parameter code Display status ↓...
Page 72 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Address Display Function Display Display Meaning Status code code status code status status Restoration to default Blinks for 3 settings 3 seconds At this time, the system clears all settings, but stores engineering numbers of the indoor and outdoor units, quantities of the indoor and outdoor units, and commissioning completion status.
Page 73: Chapter 3 Faults
Gree GMV6 DC Inverter VRF Units Service Manual Chapter 3 Faults 1 Error Indication Error Error Content Content — Code Code Malfunction of IDU Protection of indoor fan Auxiliary heating protection Water-full protection Abnormal Power for wired controller Freeze prevention protection...
Page 74 Gree GMV6 DC Inverter VRF Units Service Manual Error Error — Content Content Code Code Malfunction of ODU High-pressure protection Discharge low-temperature protection Low-pressure protection High discharge temperature protection of Drive IPM low temperature protection compressor Main board of ODU is poor...
Page 75 Gree GMV6 DC Inverter VRF Units Service Manual Error Error — Content Content Code Code Over-current protection of inverter Drive IPM module protection of compressor compressor Malfunction of drive temperature sensor of Drive IPM high temperature protection of compressor compressor...
Page 76 Gree GMV6 DC Inverter VRF Units Service Manual Error — Error Code Content Content Code Wrong setting of ODU’s capacity Preheat time of compressor is insufficient code/jumper cap Power phase sequence protection Refrigerant-lacking protection Wrong address for driving board of...
Page 77: Troubleshooting
Gree GMV6 DC Inverter VRF Units Service Manual 2 Troubleshooting When troubleshooting the modular units, make sure that all outdoor units are powered off and powered on at the same time. Avoid doing so to only some of the outdoor units.
Page 78 Gree GMV6 DC Inverter VRF Units Service Manual Possible causes: -- Troubleshooting: not required. 2.5 "A6" Cooling and Heating Function Settings State Fault display: main board of outdoor unit displays Fault diagnosis: This is a status code. It indicates that the system has entered cooling and heating function settings state.
Page 79 Gree GMV6 DC Inverter VRF Units Service Manual Possible causes: -- Troubleshooting: not required. 2.10 "AF" Fan State Fault display: main board of outdoor unit displays Fault diagnosis: This is a status code. It indicates that the system has entered the fan mode. In this case, all the indoor units operate only in fan mode.
Page 80 Gree GMV6 DC Inverter VRF Units Service Manual Fault diagnosis: This is a status code. It indicates that the unit is in emergency stop status through remote centralized control, and it cannot be started unless such state is disabled. Possible causes: -- Troubleshooting: not required.
Page 81 Gree GMV6 DC Inverter VRF Units Service Manual "b1" Outdoo r A mb ient Temperature Sen sor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 82 Gree GMV6 DC Inverter VRF Units Service Manual "b2" Defrosting Temperature Sen sor 1 Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 83 Gree GMV6 DC Inverter VRF Units Service Manual "b3" Defrosting Temperature Sen sor 2 Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 84 Gree GMV6 DC Inverter VRF Units Service Manual "b4" Sub coo ler's Li quid Outlet Tempe ratu re Sensor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or...
Page 85 Gree GMV6 DC Inverter VRF Units Service Manual "b5" Sub coo ler's G as Outlet Tempe ratu re Sensor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or...
Page 86 Gree GMV6 DC Inverter VRF Units Service Manual "b6" Suction Te mp erature Sen sor 1 Fault Whether th e i nter face Remove the foreign terminal between the main boa rd and temperature sensor gets loose or matters and plug it tightly...
Page 87 Gree GMV6 DC Inverter VRF Units Service Manual "b7" Suction Te mp erature Sen sor 2 Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 88 Gree GMV6 DC Inverter VRF Units Service Manual "b8" Outdoo r Humidity Sen sor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 89 Gree GMV6 DC Inverter VRF Units Service Manual "b9" Heat E xchang er's G as Outlet Tempe ratu re Sensor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or...
Page 90 Gree GMV6 DC Inverter VRF Units Service Manual "bA" Oil Return Temperature Sen sor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 91 Gree GMV6 DC Inverter VRF Units Service Manual “bd” subcooler air inlet temperature sensor error Check the terminal between main If it is loosened or there are board and temperature sensor to see if it is foreign objects, retighten it...
Page 92 Gree GMV6 DC Inverter VRF Units Service Manual Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value. If the sampling AD value exceeds upper limit and lower limit in 30 seconds...
Page 93 Gree GMV6 DC Inverter VRF Units Service Manual "C0" Communication Fault Between Indoor and Outdoor Units and Between Indoor Unit and Wired Controller Whether the communication cables between the main control board of the Connect the communication outdoor unit and the indoor unit and between...
Page 94 Gree GMV6 DC Inverter VRF Units Service Manual ■ The main board operates improperly. Troubleshooting: "C2" Communication Fault Between the Primary Controller and Inverter Compressor Driver Whether the communication cables between the main board of outdoor Connect the communication unit and inverter compressor drive board...
Page 95 Gree GMV6 DC Inverter VRF Units Service Manual "C3" Communication Fault Between the Primary Controller and Inverter Fan Driver Whether the communication cables between the main board of outdoor Connect the communication unit and inverter fan drive board cables properly...
Page 96 Gree GMV6 DC Inverter VRF Units Service Manual "C4" Indoor Unit Loss Fault Whether all the indoor Power on the units units are energized? Whether the communication cables of disconnected indoor units Connect the communication (in this case the disconnected cables properly indoor units display "C0") are...
Page 97 Gree GMV6 DC Inverter VRF Units Service Manual display Fault diagnosis: The unit detects the number of online outdoor modules in real time. When it detects that the number of current modules is inconsistent with the number of modules previously commissioned and memorized, the unit will report the fault and stop working.
Page 98 Gree GMV6 DC Inverter VRF Units Service Manual indicating that the unit's fan has entered emergency operation. Possible causes: -- Troubleshooting: not required. 2.38"CA" Emergency Operation of Module Fault display: main board of outdoor unit displays Fault diagnosis: If any module is set to emergency operation mode, the main board displays the code during the operation, indicating that the unit's module has entered emergency operation.
Page 99 Gree GMV6 DC Inverter VRF Units Service Manual 2.41 "CC" No Master Units Fault Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The main board detects the master DIP switch (SA8) and determines whether it is the master.
Page 100 Gree GMV6 DC Inverter VRF Units Service Manual Step 1: for the mode exchanger with several main boards, please check if error is reported for every main board, if no, please make sure at least one branch is connected with IDU under the main board of every mode exchanger;...
Page 101 Gree GMV6 DC Inverter VRF Units Service Manual Possible causes: ■ If two or more master units' DIP switches (SA2) are detected to be master unit's DIP switches, keep only one master unit's DIP switch (SA2) to be "00000" and other master units' DIP switches (SA2) to be different;...
Page 102 Gree GMV6 DC Inverter VRF Units Service Manual 2.45 "CP" Fault of Multiple Main Wired Controllers Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: Two or more wired controllers in an HBS network are main wired controllers.
Page 103 Gree GMV6 DC Inverter VRF Units Service Manual "Cb" IP A ddress Assignment O ver flow Is th e p roblem so lve d afte r the indoo r a nd outdoor units are power ed o ff a nd powered...
Page 104 Gree GMV6 DC Inverter VRF Units Service Manual If the communication cord of mode exchanger IDU and ODU is not correctly connected, it will report IDU and ODU network communication abnormality; if data tested in 5 consecutive seconds is back to normal, the error will be resumed.
Page 105 Gree GMV6 DC Inverter VRF Units Service Manual 2.50 "d1" Poor Indoor Circuit Board Fault display: wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: Check whether the address chip and memory chip of the indoor unit's main board can be read properly.
Page 106 Gree GMV6 DC Inverter VRF Units Service Manual 2.52 "d3" Ambient Temperature Sensor Fault Fault display: wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 107 Gree GMV6 DC Inverter VRF Units Service Manual "d4" Inlet Pi pe Tempe ratu re Sen sor Fault Whether th e i nter face terminal between the main boa rd Remove the foreign and inl et pipe temperature sensor gets loose...
Page 108 Gree GMV6 DC Inverter VRF Units Service Manual "d6" Outlet P ipe Temperature Sen sor Fault Whether th e i nter face terminal between the main boa rd and outlet Remove the foreign pipe temperature sensor gets loose or matters and plug it tightly...
Page 109 Gree GMV6 DC Inverter VRF Units Service Manual "d7" Humidity Sen sor Fault Whether th e i nter face terminal between the main boa rd Remove the foreign and hu mid ity sen sor gets lo ose or matters and plug it tightly...
Page 110 Gree GMV6 DC Inverter VRF Units Service Manual "d9" Jumper Ca p Fau lt Whether th e j ump er cap is proper ly Install the jumper ca p installed at the jump silk screen on the main boar d?
Page 111 Gree GMV6 DC Inverter VRF Units Service Manual 2.60 "dH" Abnormal Circuit Board of Wired Controller Fault display: wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The wired controller's IIC communication is abnormal. Possible causes: ■...
Page 112 Gree GMV6 DC Inverter VRF Units Service Manual "dC" Abn ormal Setting s of DIP Switch for Ca pacity Whether th e DIP switch for capacity on th e main bo ard is dial ed Redial the DIP switch to a n in cor rect positi on?
Page 113 Gree GMV6 DC Inverter VRF Units Service Manual 2.63 "dE" Indoor CO2 Sensor Fault (Reserved) 2.64 “dF” Temperature sensor error Error display: hydro box wired controller will display Applicable mode: all hydro boxes Error judgment condition and method: Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value.
Page 114 Gree GMV6 DC Inverter VRF Units Service Manual “dJ” water return temperature sensor error Is the terminal between If it is loosened or there Mainboard and water return temperature are foreign objects, sensor loose or any foreign objects retighten it after treatment...
Page 115 Gree GMV6 DC Inverter VRF Units Service Manual 1) Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value. If the sampling AD value exceeds upper limit and lower limit in 5 seconds...
Page 116 Gree GMV6 DC Inverter VRF Units Service Manual Troubleshooting: “dd” solar energy temperature sensor error Is the terminal between If it is loosened or there are main board and solar energy water foreign objects, retighten it temperature sensor loose or any foreign...
Page 117 Gree GMV6 DC Inverter VRF Units Service Manual 2.71 "E1" Protection in Case of Too High Pressure Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the high pressure sensor detects that the temperature at the high pressure is greater than 65°C or the high pressure switch is disconnected, it indicates that the high pressure is too high, and the...
Page 118 Gree GMV6 DC Inverter VRF Units Service Manual E1 System Overpressure Pro tection Whether the high pressure of the unit Whether th e h igh pressu re Replace th e main bo ard of (measured by the external switch operates p roperly?
Page 119 Gree GMV6 DC Inverter VRF Units Service Manual 2.72 "E2" Protection in Case of Too Low Air Discharge Temperature of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the difference between the air discharge temperature of compressor and the temperature at the high pressure is below 10°C, the unit stops running to ensure safe operation.
Page 120 Gree GMV6 DC Inverter VRF Units Service Manual able to reset the unit normally, inspect other parts of the unit. Step 4: Check whether the refrigerant is added in accordance with the design requirements, as excessive refrigerant may trigger system protection.
Page 121 Gree GMV6 DC Inverter VRF Units Service Manual "E3" System Low Pressure Protection Does the low A fault occurs in the low pressure (measured by the pressure sensor. pressure gauge) reach the Replace the pressure sensor protection value? Add the refrigerant by the...
Page 122 Gree GMV6 DC Inverter VRF Units Service Manual 2.74 "E4" Protection in Case of Too High Air Discharge Temperature of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the compressor's discharge temperature detected by the temperature sensors on the discharge pipes and on the top of the compressor is above 118°C, the unit stops running to ensure safe...
Page 123 2.75 “Ed” Low drive module temperature protection Error display: ODU main board, IDU wired controller and IDU receive light board will display Applicable model: GMV6 series Error judgment condition and method: Test module temperature through the internal sensor of IPM module, when the test value is below outdoor ambient temperature, the system will stop for protection.
Page 124 Gree GMV6 DC Inverter VRF Units Service Manual "F0" Poo r Main Bo ard of the Outdoor Unit Whether syste m clock exce ptio n Replace th e CPU is a lso gen erated (check by u sin g the...
Page 125 Gree GMV6 DC Inverter VRF Units Service Manual 2.77 "F1" High-pressure Sensor Fault Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The sensor detection circuit samples the AD value of high pressure sensor and determines the range of AD value.
Page 126 Gree GMV6 DC Inverter VRF Units Service Manual 2.78 "F3" Low Pressure Sensor Fault Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The sensor detection circuit samples the AD value of low pressure sensor and determines the range of AD value.
Page 127 Gree GMV6 DC Inverter VRF Units Service Manual 2.79 "F5" Discharge Temperature Sensor Fault of Compressor 1 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 128 Gree GMV6 DC Inverter VRF Units Service Manual 2.80 "F6" Discharge Temperature Sensor Fault of Compressor 2 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 129 Gree GMV6 DC Inverter VRF Units Service Manual 2.81 "F7" Discharge Temperature Sensor Fault of Compressor 3 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 130 Gree GMV6 DC Inverter VRF Units Service Manual 2.82 "F8" Discharge Temperature Sensor Fault of Compressor 4 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 131 Gree GMV6 DC Inverter VRF Units Service Manual 2.83 "F9" Discharge Temperature Sensor Fault of Compressor 5 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 132 Gree GMV6 DC Inverter VRF Units Service Manual 2.84 "FA" Discharge Temperature Sensor Fault of Compressor 6 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 133 Gree GMV6 DC Inverter VRF Units Service Manual 2.85 "FH" Abnormal Current Sensor of Compressor 1 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 134 Gree GMV6 DC Inverter VRF Units Service Manual 2.86 "FC" Abnormal Current Sensor of Compressor 2 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 135 Gree GMV6 DC Inverter VRF Units Service Manual 2.87 "FL" Abnormal Current Sensor of Compressor 3 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 136 Gree GMV6 DC Inverter VRF Units Service Manual 2.88 "FE" Abnormal Current Sensor of Compressor 4 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 137 Gree GMV6 DC Inverter VRF Units Service Manual 2.89 "FF" Abnormal Current Sensor of Compressor 5 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 138 Gree GMV6 DC Inverter VRF Units Service Manual 2.90 "FJ" Abnormal Current Sensor of Compressor 6 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 139 Gree GMV6 DC Inverter VRF Units Service Manual 2.91 "FU" Shell Roof Temperature Sensor Fault of Compressor 1 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 140 Gree GMV6 DC Inverter VRF Units Service Manual 2.92 "Fb" Shell Roof Temperature Sensor Fault of Compressor 2 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 141 Gree GMV6 DC Inverter VRF Units Service Manual 2.93 “Fd” Mode exchanger outlet pipe temperature sensor error Error display: main board of mode exchanger will display Applicable mode: mode exchanger Error judgment condition and method: Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value.
Page 142 Gree GMV6 DC Inverter VRF Units Service Manual Step 1: check the terminal between mode exchanger main board and temperature sensor to see if it is loose or any foreign objects inside? If yes, reconnect it after treatment; Step 2: check if the temperature sensor is abnormal, if yes, replace the temperature sensor;...
Page 143 Gree GMV6 DC Inverter VRF Units Service Manual outdoor unit, based on which you are able to identify the specific fault of the fan drive board. Then, troubleshoot the fault according to the corresponding troubleshooting methods. Possible causes: ■ IPM module protection for the fan drive (2-digit digital LED of the main control board of the outdoor unit displays H6);...
Page 144 Gree GMV6 DC Inverter VRF Units Service Manual 2.98 "H3" Reset Protection for the Fan Drive Module Fault display: wired controller of indoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H3, it indicates the reset protection for the fan drive board.
Page 145 Gree GMV6 DC Inverter VRF Units Service Manual 2.99 "H5" Inverter Fan Over-current Protection Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H5, it indicates the over-current protection for the inverter fan.
Page 146 Gree GMV6 DC Inverter VRF Units Service Manual 2.100 "H6" IPM Module Protection for Fan Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H6, it indicates the IPM module protection for the fan drive.
Page 147 Gree GMV6 DC Inverter VRF Units Service Manual 2.101 "H7" Temperature Sensor Fault of Fan Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H7, it indicates the temperature sensor fault for the fan drive.
Page 148 Gree GMV6 DC Inverter VRF Units Service Manual 2.102 "H8" IPM Over Temperature Protection for Fan Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H8, it indicates the IPM over temperature protection for the fan drive.
Page 149 Gree GMV6 DC Inverter VRF Units Service Manual 2.103 "H9" Loss of Synchronization Protection for Inverter Fan Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H9, it indicates the loss of synchronization protection for the inverter fan.
Page 150 Gree GMV6 DC Inverter VRF Units Service Manual 2.104 "HC" Current Detection Circuit Fault of Fan Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is HC, it indicates the current detection circuit fault of fan drive.
Page 151 Gree GMV6 DC Inverter VRF Units Service Manual “HH” fan drive DC bus high voltage protection Check if power supply voltage Adjust the voltage to 208/230V is higher than 430V or 780V or 460V(for 460V-voltage) (for 460V- voltage) Fan drive board is...
Page 152 Gree GMV6 DC Inverter VRF Units Service Manual 2.107 "HJ" Inverter Fan Startup Failure Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is HJ, it indicates the inverter fan startup failure.
Page 153 Gree GMV6 DC Inverter VRF Units Service Manual 2.108 "J0" Protection for Other Modules Fault display: main board of outdoor unit displays while the indoor unit and receiver of indoor unit do not. Applicable models: GMV6, GMV5, GMV5S, TOPS, GMV water Series...
Page 154 Gree GMV6 DC Inverter VRF Units Service Manual “J1”Compressor 1 overcurrent protection Turn on the units again according to the IDU capacity and quantity when this protection happened If compressor operates to the lowest frequency while system high pressure is still higher than 60℃, the compressor may occur normal overcurrent protection.
Page 155 Gree GMV6 DC Inverter VRF Units Service Manual 2.110 "J2" Compressor 2 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 156 Gree GMV6 DC Inverter VRF Units Service Manual “J2”Compressor 2 overcurrent protection Turn on the units again according to the IDU capacity and quantity when this protection happened If compressor operates to the lowest frequency while system high pressure is still higher than 60℃, the compressor may occur normal overcurrent protection.
Page 157 Gree GMV6 DC Inverter VRF Units Service Manual 2.111 "J3" Compressor 3 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 158 Gree GMV6 DC Inverter VRF Units Service Manual 2.112 "J4" Compressor 4 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 159 Gree GMV6 DC Inverter VRF Units Service Manual 2.113 "J5" Compressor 5 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 160 Gree GMV6 DC Inverter VRF Units Service Manual 2.114 "J6" Compressor 6 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 161 Gree GMV6 DC Inverter VRF Units Service Manual 2.115 "J7" Four-way Valve Air Backflow Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the difference between the system high pressure and low pressure during operation detected by the pressure sensor is less than 0.1 MPa, the unit will stop running to ensure safe operation.
Page 162 Gree GMV6 DC Inverter VRF Units Service Manual "J7" Four-way Va lve Air Backflo w Protection Whether th e four-way valve Conne ct them prope rly and coil is connected to the ma in relia bly boa rd p roperl y?
Page 163 Gree GMV6 DC Inverter VRF Units Service Manual 2.116 "J8" High Pressure Ratio Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the ratio between the system high pressure and the low pressure during operation detected by the pressure sensor exceeds 8, the unit will stop running to ensure safe operation.
Page 164 Gree GMV6 DC Inverter VRF Units Service Manual 2.117 "J9" Low Pressure Ratio Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the ratio between the system high pressure and the low pressure during operation detected by the pressure sensor is smaller than 1.8, the unit will stop running to ensure safe operation.
Page 165 Gree GMV6 DC Inverter VRF Units Service Manual If the enquired IDU is normal, no fault code will be displayed in the temperature area; if the ① unit indoor has multiple faults, fault codes will be displayed in the temperature area at an interval of 3 seconds.
Page 166 Gree GMV6 DC Inverter VRF Units Service Manual 2.119 "L1" Indoor Fan Protection Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: Check whether the indoor unit rotates slowly or stops or whether there exists external fan protection signal.
Page 167 Gree GMV6 DC Inverter VRF Units Service Manual "L1" Indoor Fan Protectio n Is th e type of motor o f th e faulty indo or u nit DC motor, AC mo tor or PG motor? For a DC motor or a PG mo tor, the low speed of mo tor would trigger pro tection.
Page 168 Gree GMV6 DC Inverter VRF Units Service Manual 2.120 "L2" E-heater Protection (Reserved Code, Not Yet Applied) 2.121 "L3" Overflow Protection Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: When the water level is too high, the float switch of indoor unit will be triggered for overflow protection.
Page 169 Gree GMV6 DC Inverter VRF Units Service Manual 2.122 "L4" Supply Power Over-current Protection Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: When the current supplied to the wired controller by the indoor unit is too large, the fault is generated.
Page 170 Gree GMV6 DC Inverter VRF Units Service Manual 2.123 "L5" Antifreeze Protection Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: When the pipe temperature of the indoor unit is too low, the unit will trigger antifreeze protection to prevent the evaporator from freezing.
Page 171 Gree GMV6 DC Inverter VRF Units Service Manual 2.124 "L6" Mode Conflict (Reserved) 2.125 "L7" No Master Indoor Unit Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: The unit triggers the "no master indoor unit" fault when no master indoor unit exists in the system.
Page 172 Gree GMV6 DC Inverter VRF Units Service Manual 2.126 "L9" Inconsistent Number of Indoor Units Under Integrated Control Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: When more than 16 indoor units are connected to the wired controller or the number of indoor units connected to the wired controller is not the same as what is configured under integrated control, the fault is generated.
Page 173 Gree GMV6 DC Inverter VRF Units Service Manual 2.128 "LH" Poor Air Quality Alarm (Reserved Code, Not Yet Applied) 2.129 "LC" Unmatched Models of Indoor and Outdoor Units Fault display: wired controller of indoor unit and receiver of indoor unit display...
Page 174 Gree GMV6 DC Inverter VRF Units Service Manual “LL” waterflow switch error Is the terminal between If it is loosened or there Mainboard and water flow switch loose are foreign objects, or any foreign objects inside? retighten it after treatment...
Page 175 Gree GMV6 DC Inverter VRF Units Service Manual 2.132 “LU” Inconsistent IDU branch connecting to the wired controller which controls multiple indoor units of heat recovery system Error display: wired controller will display Applicable model: wired controller connecting to several IDUs...
Page 176 Gree GMV6 DC Inverter VRF Units Service Manual “Ln” lifting panel return air frame reset is abnormal Is the terminal between If it is loosened or there main board and limit switch loose or are foreign objects, any foreign objects inside?
Page 177 Gree GMV6 DC Inverter VRF Units Service Manual 2.136 "n4" Settings Status of Maximum Output Capacity Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: This is a status code of a function. It indicates that the unit has entered settings status of maximum output capacity.
Page 178 Gree GMV6 DC Inverter VRF Units Service Manual 2.140 "n9" Status of Querying Number of Online Indoor Units Fault display: main board of outdoor unit displays Fault diagnosis: The code is a query status code, in which case you can query the number of online indoor units.
Page 179 Gree GMV6 DC Inverter VRF Units Service Manual 2.145 "nF" Fan Type Unit Fault display: main board of outdoor unit displays Fault diagnosis: The code indicates that the indoor unit only operates in fan mode. Possible causes: -- Troubleshooting: not required.
Page 180 Gree GMV6 DC Inverter VRF Units Service Manual “o3” IDU IPM module protection Check if the contact of U, V and W wire of indoor fan is good Check is the resistance among winding of each indoor fan phase equal? Is the insulation...
Page 181 Gree GMV6 DC Inverter VRF Units Service Manual “o7” IDU non-synchronism protection Check if the contact of U, V and W wire of indoor fan is good Check is the resistance among winding of each indoor fan phase equal? Is the insulation...
Page 182 Gree GMV6 DC Inverter VRF Units Service Manual “o8” drive communication error Check the terminal between If it is loosened or external drive board and main control there are foreign board to see if it is loose or any objects, retighten it...
Page 183 Gree GMV6 DC Inverter VRF Units Service Manual “o9” IDU main control communication error Check the terminal between main If it is loosened or there board and external drive board to see if it is foreign objects, loose or any foreign objects inside? retighten it after treatment 否...
Page 184 Gree GMV6 DC Inverter VRF Units Service Manual 2.151 "P1" Malfunctioning Compressor Drive Board Fault display: wired controller of indoor unit displays Fault diagnosis: If the fault code displayed on the wired controller of the indoor unit is P1, check the fault code displayed on the 2-digit digital LED of the main control board of the outdoor unit, based on which you are able to identify the specific fault of the compressor drive board.
Page 185 Gree GMV6 DC Inverter VRF Units Service Manual Troubleshooting: "P3" Reset Protection for the Compr essor Drive Module Is th e p roblem so lve d after the unit is powered off and powere d o n for mor e than three time s?
Page 186 Gree GMV6 DC Inverter VRF Units Service Manual "P5" Inve rte r Compressor Over-current Protection Whether th e U, V and W pha ses of compressor wire s are connected prope rly? Whether the resistance between the windings of each phase for the...
Page 187 Gree GMV6 DC Inverter VRF Units Service Manual 2.155 "P6" IPM Module Protection for the Compressor Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is P6, it indicates the IPM module protection for the compressor drive.
Page 188 Gree GMV6 DC Inverter VRF Units Service Manual 2.156 "P7" Abnormal Temperature Sensor of Compressor Drive Board Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is P7, it indicates the abnormal temperature sensor of compressor drive board.
Page 189 Gree GMV6 DC Inverter VRF Units Service Manual "P8" IPM Over Temperature Pro tection for the Compressor Drive Boar d Check whether th e screws are Whether over-temperature tightened and whether the IPM protection of IPM modul e is trig gered...
Page 190 Gree GMV6 DC Inverter VRF Units Service Manual "P9" Loss of Synchroni zation Pro tection for the Inverte r Compressor Whether th e U, V and W pha ses of compressor wire s are connected prope rly? Whether th e U, V and W...
Page 191 Gree GMV6 DC Inverter VRF Units Service Manual 2.159 "PC" Current Detection Circuit Fault of Compressor Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is PC, it indicates the current detection circuit fault of compressor drive.
Page 192 Gree GMV6 DC Inverter VRF Units Service Manual “PH” Compressor drive DC bus high voltage protection Check if power supply voltage Adjust the voltage to 208/230V is higher than 430V or 780V or 460V(for 460V-voltage) (for 460V- voltage) Compressor drive...
Page 193 Gree GMV6 DC Inverter VRF Units Service Manual ■ The compressor is damaged; ■ The compressor drive board operates improperly. Troubleshooting: "PJ" Inve rte r Compressor Startup Fa ilure Whether th e U, V and W pha ses of compressor wire s are...
Page 194 Gree GMV6 DC Inverter VRF Units Service Manual 2.163 "U0" Insufficient Warm-up Time for Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the oil preheating period of time before compressor starts is less than eight hours, the unit generates a fault.
Page 195 Gree GMV6 DC Inverter VRF Units Service Manual 2.165 "U3" Power Phase-Sequence Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: Check the three-phase power of the unit. If the power is connected incorrectly, thereby causing phase loss or reverse phase, the unit generates a fault.
Page 196 Gree GMV6 DC Inverter VRF Units Service Manual "U4" Refrigerant Loss Protection Whether the refrigerant is added in accordance with the design requirements? Check and troubleshoot the leaks of pipes 2.167 "U6" Abnormal Valve Prompt Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit...
Page 197 Gree GMV6 DC Inverter VRF Units Service Manual "U8" Abnormal Pipes of the Indoor Unit Power on the units based on the capacity and number of indoor units enabled previously in the case of protection state. After Replace the expansion valve coil...
Page 198 Gree GMV6 DC Inverter VRF Units Service Manual 2.170 "UC" Master Indoor Unit Set Successfully Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The code indicates the state of the unit rather than the fault. During the commissioning process, the unit prompts that the master indoor unit is already set successfully.
Page 199 Gree GMV6 DC Inverter VRF Units Service Manual Step 1: replace mode exchanger main board to see if the error is solved; Step 2: if UF error still exists after replacing mode exchanger main board, disconnect the communication connection of all IDUs and mode exchangers, connect the IDU communication cord one by one to the communication board of mode exchanger until all the IDUs which have triggered the UF error are tested;...
Page 200 Gree GMV6 DC Inverter VRF Units Service Manual Possible reasons: ■ Poor contact between IFD feedback side and main board interface terminal ■IFD abnormality ■Detecting circuit is abnormal Troubleshooting: ”yA” IFD error Check the terminal between main If it is loosened or there are...
Page 201 Gree GMV6 DC Inverter VRF Units Service Manual “y8” indoor air box sensor general error Check if the monitor software displays air box and the test data Check if the communication cord between main control board and air box loose or any foreign objects inside? If it is...
Page 202 Gree GMV6 DC Inverter VRF Units Service Manual ■ The unit operates out of the range of required ambient temperature. ■ Airflow organization is set ineffectively. ■ The amount of refrigerant is insufficient. Troubleshooting: Ineffective Coolin g a nd Heating...
Page 203 Gree GMV6 DC Inverter VRF Units Service Manual 2.178 No Faults Displayed But Compressor Not Starting in Cooling/Heating Mode Error display: no error displayed but compressor not starting in cooling / heating mode Applicable model: all ODUs Error judgment condition and method: Under shutdown status, the high pressure sensor has detected that the high pressure of the module is 55℃...
Page 204: Non-Fault Type Troubleshooting
Reduce heat resources. Filter is blocked and dirty. Clean the filter. NOTICE: If problem cannot be solved after checking the above items, please contact Gree service center and describe the cases and models. ● Following circumstances are not malfunctions. Phenomenon...
Page 205 Gree GMV6 DC Inverter VRF Units Service Manual Phenomenon Causes When the system is switching cooling and heating modes; during heating operation, the unit enters or This is the sound for direction reversal of 4-way quits defrosting operation or oil valve.
Page 206: Chapter 4 Maintenance
Gree GMV6 DC Inverter VRF Units Service Manual Chapter 4 Maintenance During the maintenance of a modular unit, all the outside units must be powered on and off concurrently. Avoid doing so to only some of the outdoor units. 1 Precautions for Refrigerant Leakage (1) AC project designers and installers shall obey the local laws and regulations on the safety requirement of the usage and leakage of refrigerant.
Page 207 Gree GMV6 DC Inverter VRF Units Service Manual 2.2 Refrigerant charging amount B of every module Refrigerant charging amount B of every module (kg(Pounds)) Module capacity(kW) ② IDU/ODU rated capacity Quantity of 22.4 33.5 50.4 61.5 collocation ratio C indoor unit ①...
Page 208: Refrigerant Charging Method
Gree GMV6 DC Inverter VRF Units Service Manual Modular combination of outdoor unit subjects to combinations that is currently available. 3 Refrigerant Charging Method Refrigerant charging for multi VRF unit includes two parts: pre-charging and start-up charging. 3.1 Pre-charging of refrigerant.
Page 209 Gree GMV6 DC Inverter VRF Units Service Manual Step 5: Open the high pressure gauge valve (the low pressure gauge valve remains closed), charge the system with refrigerant, and record the weight change of the refrigerant tank. Step 6: When refrigerant tank is over and the refrigerant can’t be charged to the system any more, record the current weight of m2.
Page 210 Gree GMV6 DC Inverter VRF Units Service Manual Step 2: Fully open the liquid pipe valve and gas pipe valve of each module. Step 3: Make the complete unit enter into debugging operation by the debugging software or the main board of outdoor unit. (see the debugging part for the specific operation).
Page 211: Inspection Of Key Parts
Gree GMV6 DC Inverter VRF Units Service Manual 4 Inspection of Key Parts 4.1 Power Specifications Description The power supplies of the compressor and fan comprise the following three parts: Use of power to the main control board: ① The specifications of the input power are 440~460V 3~ 60Hz+ earth ①...
Page 212 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U...
Page 213 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description The power supplies of the compressor and fan comprise the following three parts: Use of power to the main control board: ① The specifications of the input power are 440~460V 3~ 60Hz+ earth ①...
Page 214 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description The power supplies of the compressor and fan comprise the following three parts: Use of power to the main control board: ① The specifications of the input power are 440~460V 3~ 60Hz+ earth ①...
Page 215 Gree GMV6 DC Inverter VRF Units Service Manual 4.1.1 Mechanical Inspection (1) Confirm that the unit power is disconnected. (2) Remove the electrical appliance cover. (3) Check whether the power cable is fixed on the wiring board. (4) Check whether the fuses on the main board and filter board are damaged.
Page 216 Gree GMV6 DC Inverter VRF Units Service Manual 4.2 Temperature Sensors Specifications Description Three types of temperature sensors of different specifications are The sensors are used to measure the temperature of the unit at different positions. used, including 50K, 20K and 15K.
Page 217 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description Three types of temperature sensors of different specifications are The sensors are used to measure the temperature of the unit at different positions. used, including 50K, 20K and 15K. Models: GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U...
Page 218 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description Three types of temperature sensors of different specifications are The sensors are used to measure the temperature of the unit at different positions. used, including 50K, 20K and 15K. Models: GMV-560WM/G-U, GMV-615WM/G-U, GMV-680WM/G-U...
Page 219 Gree GMV6 DC Inverter VRF Units Service Manual 4.2.1 Mechanical Inspection (1) Confirm that the unit Power is disconnected. (2) Find the place corresponding to each sensor on the unit and check if the sensors are firmly fixed on the unit.
Page 220 Gree GMV6 DC Inverter VRF Units Service Manual 15K temperature sensor resistance - temperature curve Temperature Resistance \°C \KΩ 108.7 82.75 63.46 49.02 38.15 29.9 23.6 18.75 12.07 9.779 7.967 6.529 5.379 4.456 3.711 3.105 2.611 2.205 1.871 1.594 1.363 1.171...
Page 221 Gree GMV6 DC Inverter VRF Units Service Manual 20K temperature sensor resistance - temperature curve Temperature Resistance \°C \KΩ 361.8 265.5 196.9 110.3 84.61 65.37 50.87 39.87 31.47 25.01 16.1 13.04 10.62 8.705 7.173 5.942 4.948 4.14 3.481 2.94 2.495 2.125...
Page 222 Gree GMV6 DC Inverter VRF Units Service Manual 50K temperature sensor resistance - temperature curve Temperature Resistance \°C \KΩ 911.56 660.93 486.55 362.99 274.02 209.05 161.02 126.17 98.006 77.349 61.478 49.191 39.61 32.088 26.147 21.425 17.651 14.618 12.168 10.178 8.5551 7.2245...
Page 223 Gree GMV6 DC Inverter VRF Units Service Manual 4.3 Solenoid Valve Specifications Description The 4-way valve is used to switch between cooling mode and heating mode. If the 4-way valve is active, the ① Coils of different types are used on: unit works in heating mode, if the 4-way valve is inactive, the unit works in cooling mode.
Page 224 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description The 4-way valve is used to switch between cooling mode and heating mode. If the 4-way valve is active, the ① Coils of different types are used on: unit works in heating mode, if the 4-way valve is inactive, the unit works in cooling mode.
Page 225 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description The 4-way valve is used to switch between cooling mode and heating mode. If the 4-way valve is active, the ① Coils of different types are used on: unit works in heating mode, if the 4-way valve is inactive, the unit works in cooling mode.
Page 226 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description The 4-way valve is used to switch between cooling mode and heating mode. If the 4-way valve is active, the ① Coils of different types are used on: unit works in heating mode, if the 4-way valve is inactive, the unit works in cooling mode.
Page 227 Gree GMV6 DC Inverter VRF Units Service Manual 4.3.1 Mechanical Inspection (1) Confirm that the unit Power is disconnected. (2) Find the 4-way valve or solenoid valve, check whether the fixing screw is loose and whether the valve and coil have any apparent exceptions.
Page 228 Gree GMV6 DC Inverter VRF Units Service Manual 4.4 Electronic Expansion Valve Specifications Description Two types of electronic expansion valves are adopted by the unit: ① Heating electronic expansion valve with the largest openness of 3000 pls and 6-core coil.
Page 229 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U...
Page 230 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description Two types of electronic expansion valves are adopted by the unit: ① Heating electronic expansion valve with the largest openness of 3000 pls and 6-core coil. The electronic expansion valve is used to control the flow. When the electronic ②...
Page 231 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description Two types of electronic expansion valves are adopted by the unit: ① Heating electronic expansion valve with the largest openness of 3000 pls and 6-core coil. The electronic expansion valve is used to control the flow. When the electronic ②...
Page 232 Gree GMV6 DC Inverter VRF Units Service Manual 4.4.1 Mechanical Inspection Step 1: Switch off the power of the ODU. Step 2: Check whether the coil of the electronic expansion valve is firmly fixed on the electronic expansion valve. 4.4.2 Electrical Inspection Step 1: Power off the ODU and power on it.
Page 233 Gree GMV6 DC Inverter VRF Units Service Manual 4.5 Fans Specifications Description The fans are powered by a DC inverter motor and can adjust the speed automatically The unit of 8HP-12HP is equipped with one fan, while the unit of 14HP-24HP is equipped with according to the environmental temperature and load, thus adapting to the demand of two fans.
Page 234 Gree GMV6 DC Inverter VRF Units Service Manual...
Page 235 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 236 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-560WM/G-U, GMV-615WM/G-U, GMV-680WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 237 Gree GMV6 DC Inverter VRF Units Service Manual 4.5.1 Mechanical Inspection Step 1: Switch off the power of the ODU. Step 2: Check whether the connector between the fan motor and fan drive board is firmly connected. Step 3: Rotate the blades with a hand to check whether they can rotate smoothly and whether the blades rub the baffle ring during rotation.
Page 238 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-224WM/G-U, GMV-280WM/G-U, GMV-335WM/G-U Circuit diagram Physical position...
Page 239 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U Circuit diagram Physical position...
Page 240 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-560WM/G-U, GMV-615WM/G-U, GMV-680WM/G-U Circuit diagram Physical position...
Page 241 Gree GMV6 DC Inverter VRF Units Service Manual 4.6.1 Diagnosis of Compressor Failures 4.6.1.1 When the unit can be started Step 1: If the unit can be started, check the faulty compressor's line current. Use a pressure gauge to measure the gas and liquid valve pressure and monitor the measured data on a PC. Compare the data to the following table of recommended current.
Page 242 Gree GMV6 DC Inverter VRF Units Service Manual When the compressor frequency is 60 Hz, the power curve corresponding to the evaporation temperature and condensation temperature is shown as follows: When the compressor frequency is 90 Hz, the power curve corresponding to the evaporation...
Page 243 Gree GMV6 DC Inverter VRF Units Service Manual When the compressor frequency is 120 Hz, the current curve corresponding to the evaporation temperature and condensation temperature is shown as follows: When the compressor is working at another frequency, the current curve can be obtained through interpolation calculation of the above frequency.
Page 244 Gree GMV6 DC Inverter VRF Units Service Manual When the compressor frequency is 90 Hz, the current curve corresponding to the evaporation temperature and condensation temperature is shown as follows: When the compressor frequency is 120 Hz, the current curve corresponding to the evaporation...
Page 245 Gree GMV6 DC Inverter VRF Units Service Manual Check whether the electronic expansion valve of the ODU and 4-way valve work properly, and whether the oil-return pipeline and oil-return valve are normal. Touch the oil-return capillary tube with a hand to check whether oil flows in the tube and check the pipeline temperature.
Page 246 Gree GMV6 DC Inverter VRF Units Service Manual Notes: ① Check whether the coil is firmly fixed. ② Touch the upper part of the electronic expansion valve and check whether the resetting of the unit can be clearly felt. 4-way valve: When it is normal, the temperature different between it and the four copper tubes connecting to the valve is obvious.
Page 247 Gree GMV6 DC Inverter VRF Units Service Manual Do not touch directly by hand the position of the four-way valve in the unit. High-temperature refrigerant on the exhaust side may cause danger of burning D - Connecting to the exhaust side.
Page 248 Gree GMV6 DC Inverter VRF Units Service Manual Oil-return solenoid valve: It can be diagnosed based on the oil-return valve status displayed on the monitor program and the actual operation. When the balance valve is open, the coil heats up and the lubricant flow before and after the valve is obvious.
Page 249 Gree GMV6 DC Inverter VRF Units Service Manual 3: Point the black probe to the P bonding pad and the red probe to the L2 wiring terminal. In the normal condition, the multimeter will not beep. If it does, the drive board is damaged and needs to be replaced.
Page 250 Gree GMV6 DC Inverter VRF Units Service Manual condition, the multimeter will not beep. If it does, the drive board is damaged and needs to be replaced. 13: Point the black probe to the N1 bonding pad and the red probe to W wiring terminal. In the normal condition, the multimeter will not beep.
Page 251 Gree GMV6 DC Inverter VRF Units Service Manual 4.7 Compressor Drive Board The compressor drive board is used to control the operation of the compressor. Specifications Description The compressor drive board is used to control the operation of － the compressor.
Page 252 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 253 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-560WM/G-U, GMV-615WM/G-U, GMV-680WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 254 Gree GMV6 DC Inverter VRF Units Service Manual (1) Before the inspection: Find a correct digital multimeter and switch it to the diode gear. Power off the unit and wait two minutes. Disconnect the U, V and W cables of the compressor and L1, L2 and L3 power cables from the drive board.
Page 255 Gree GMV6 DC Inverter VRF Units Service Manual 4.8 Fan Drive Board The fan drive board is used to control the operation of the fan(s). Specifications Description The compressor drive board is used to control the operation of － the compressor.
Page 256 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 257 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-560WM/G-U, GMV-615WM/G-U, GMV-680WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 258 Gree GMV6 DC Inverter VRF Units Service Manual (1) Before the inspection: Find a correct digital multimeter and switch it to the diode gear. Power off the unit and wait two minutes. Disconnect the U, V and W cables of the fans from the drive board. Do not operate without waiting two minutes after the unit is powered off.
Page 259 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-224WM/G-U, GMV-280WM/G-U, GMV-335WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 260 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 261 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-560WM/G-U, GMV-615WM/G-U, GMV-680WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 262 Gree GMV6 DC Inverter VRF Units Service Manual Step 1: Disconnect the power and wait five minutes. Step 2: As shown in the figure, switch the multimeter to the diode gear. Point the black and red probes to the following positions to check if the main board is normal.
Page 263 Gree GMV6 DC Inverter VRF Units Service Manual 4.10 Pressure Sensor Specifications Description Inspection of high-pressure temperature of the high-pressure sensor: 1. Control of compressor output capacity 2. Conversion and calculation of saturated condensing temperature 3. Protection high pressure 4. Inspection of high-pressure value and calculation of exhaust superheat degree 5.
Page 264 Gree GMV6 DC Inverter VRF Units Service Manual...
Page 265 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 266 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-560WM/G-U, GMV-615WM/G-U, GMV-680WM/G-U Circuit diagram Layout of electrical appliance box Physical position...
Page 267 Gree GMV6 DC Inverter VRF Units Service Manual Inspection procedure Preparations (1) Use the wired controller or remote controller to shut down the unit. (2) Remove the front cover and open the electrical appliance box. Inspection of low-pressure sensor (1) Connect the pressure gauge to the gas valve and check if the gas and liquid valves are open.
Page 268: Replacement Of Key Unit Parts
Gree GMV6 DC Inverter VRF Units Service Manual 5 Replacement of Key Unit Parts 5.1 Preliminary Removing Procedure of the Main Body 5.1.1 Removing the Unit Panel 5.1.1.1 Removing the maintenance port panel (1) Press the window in the bulkhead cover to open the window.
Page 269 Gree GMV6 DC Inverter VRF Units Service Manual 5.1.1.2 Removing the right panel (1) Use a screwdriver to remove the screw marked by 1 on ① right panel (2) Remove ① right panel from the unit 3 – Screw ① - Right panel 5.1.1.3 Removing the upper left panel, bottom left panel and upper covering plate...
Page 270 Gree GMV6 DC Inverter VRF Units Service Manual 5.1.2 Removing the Cover of Electrical Appliance Box (1) Use a screwdriver to remove the screw marked by 1 on ⑤⑥ electrical appliance box (2) Remove ⑤⑥ electrical appliance box from the unit 3 - Screw;...
Page 271 Gree GMV6 DC Inverter VRF Units Service Manual Check whether the unit is the master or slave module Power off the unit and replace the main board DIP setting Checking communication status Setting of master unit engineering commissioning status System parameter...
Page 272 Gree GMV6 DC Inverter VRF Units Service Manual Display status of Display status of Display status of Display status of LED1 LED1 LED1 LED1 Master module Slave module Slave module Slave module status status status status (2) Powering off and replacing the main board ①...
Page 273 Gree GMV6 DC Inverter VRF Units Service Manual (4) Checking communication status After the setting of the main board DIP switches is completed and all the cables are connected, the ODU’s main control board is switched on. Check whether D3 and D4 indicators on the IDU sand ODU flash.
Page 274 Gree GMV6 DC Inverter VRF Units Service Manual The seal blocks of the compressor suction, exhaust and enthalpy nozzles must be intact. The electrical appliance box cover of the compressor must be intact. Check whether the models of the new and old compressors on the nameplates are the same.
Page 275 Gree GMV6 DC Inverter VRF Units Service Manual The seal blocks of all the parts must be intact. Make sure that the compressor's lubricant is sealed reliably. Hitachi compressors adopt the FVC68D dedicated lubricant, which is highly hygroscopic. Therefore, the lubricant has a strict requirement on lubricant sealing.
Page 276 Gree GMV6 DC Inverter VRF Units Service Manual Low pressure measurement valve Before discharging refrigerant and dismantling the unit, collect the refrigeration oil in the system from the low-pressure measurement valve using the following method. Connect one end of a rubber hose to the low-pressure measurement valve and the other one to a transparent container.
Page 277 Gree GMV6 DC Inverter VRF Units Service Manual Step 6: Removing compressors Check the damage of compressors, including the number of damaged compressors, positions and models. After confirming the compressor information, remove the compressors and confirm the oil quality. If the oil is clear with no impurity, it can be considered that the oil in the system is not polluted.
Page 278 Gree GMV6 DC Inverter VRF Units Service Manual Place the compressor at a position above the level of the ground, pour oil from the ② compressor exhaust port, and use a beverage bottle or other transparent container (with a volume of over 150 ml) to store oil.
Page 279 Gree GMV6 DC Inverter VRF Units Service Manual 3. Weld and loosen the connector of the inlet and outlet pipes of the oil separator 1. Remove the screw of the installation plate 2. Weld and loosen the connector of the...
Page 280 Gree GMV6 DC Inverter VRF Units Service Manual Note: The outlet pipe of the gas liquid separator must be placed under the inlet pipe when the liquid in the gas liquid separator is being drained. No more than 20° between the compressor...
Page 281 Gree GMV6 DC Inverter VRF Units Service Manual equalizer, and make relevant records to facilitate the replacement of compressors, gas-liquid separator and other components, and adding of lubricant to the system. The total amount of oil that is poured out of the system needs to be supplemented with additional oil after repair.
Page 282 Gree GMV6 DC Inverter VRF Units Service Manual Pay attention to the following items when replacing the compressors: Remove the sealing rubber block before replacing the compressor and weld the compressor and the corresponding pipeline. Nitrogen is required during the welding process. Since the compressor suction and exhaust ports are all copper-plated steel pipes, it is necessary to use solder with at least 5% silver.
Page 283 Gree GMV6 DC Inverter VRF Units Service Manual The compressors must be wired in accordance with the wiring at the factory. The control varies by compressors. If the wiring is incorrect or the two compressors are reversed, the unit may be damaged.
Page 284 Gree GMV6 DC Inverter VRF Units Service Manual 2. Weld the connector of the oil separator 1. Place the oil separator in the correct position 4. Weld the oil return pipe assembly 3. Fix the bolt Step 13: System leakage inspection Check each welding joints.
Page 285 Gree GMV6 DC Inverter VRF Units Service Manual Step 14: Recharging refrigeration oil The amount of refrigeration oil needs to be recharged is mainly determined by the total amount of lubricant poured out from removing components such as compressors and gas-liquid separator. If there...
Page 286 Compressor refrigeration oil plays an important role in the normal operation of compressor. The lubricant with the correct model number and quality must be used in accordance with the requirements of Gree after-sales and technical departments. The recharging amount must be correct. Step 15: System vacuuming After adding the appropriate lubricant, it is necessary to continue vacuuming the unit.
Page 287 In each case, run the unit for more than 30 minutes, analyze the data, adjust the unit system and make sure that all parameters are correct. For specific parameters, contact after-sales engineers or Gree's technicians. 5.4 Removing the Compressor Drive Board Preparations (1) Use the Power circuit breaker to switch off the Power of the GMV6 VRF system.
Page 288 Gree GMV6 DC Inverter VRF Units Service Manual Note: The blue squares indicate pads. (3) Disconnect all lines of the compressor drive, including: compressor line; communication line between the master unit and the drive; communication line between the compressor drive and fan drive;...
Page 289 Gree GMV6 DC Inverter VRF Units Service Manual (4) Loosen the screws on the compressor drive, as shown in the figure below: Installation procedure (1) Replace the compressor drive. Before the replacement, apply some silicone tape onto the IPM module.
Page 290 Gree GMV6 DC Inverter VRF Units Service Manual U – blue V – yellow W – red Connect to a reactor and do not distinguish by polarity (3) Please set the dialing code of the after-sales accessories to the correct state according to...
Page 291 Gree GMV6 DC Inverter VRF Units Service Manual 5.5 Removing and Installing Four-way Valve Coil Preparations (1) Use the power circuit breaker to switch off the power of the GMV6 VRF system. (2) Remove the unit’s front panel by referring to 5.1.1 Removing the Unit Panel.
Page 292 Gree GMV6 DC Inverter VRF Units Service Manual Shortest hysteresis Pipe diameter range Nitrogen pressure Shortest pre-charge Pipe length (m) nitrogen charging time (mm) range (MPa) time (s) Φ53.9~Φ104.8 0.03~0.1 ≤3 (1) Before the 4-way valve is welded, record the direction of the 4-way valve and the installation location of each nozzle.
Page 293 Gree GMV6 DC Inverter VRF Units Service Manual (2) Remove the unit’s upper and bottom panels by referring to 5.1.1 Removing the Unit Panel. Removing procedure (1) Remove the damping block wrapped on the electronic expansion valve. (2) Rotate the electronic expansion valve coil counterclockwise until it is released and then remove (3) Cut the electronic expansion valve inlet and outlet pipes to ensure that there is no residual refrigerant in the unit.
Page 294 Gree GMV6 DC Inverter VRF Units Service Manual (4) Nitrogen protection should be applied. Refer to Table 1 for nitrogen pressure. When welding, do not get the other components burnt. (5) Install the electronic expansion valve coil to the correct position and turn it clockwise until a click is heard, indicating that it is in place.
Page 295 Gree GMV6 DC Inverter VRF Units Service Manual (2) Weld the three connection points of the oil separator. Nitrogen protection should be applied. Refer to Table 1 for nitrogen pressure. Note: When welding, do not get the other components burnt.
Page 296 Gree GMV6 DC Inverter VRF Units Service Manual 5.10 Removing and Installing Plate Heat Exchanger Preparations (1) Use the power circuit breaker to switch off the power of the GMV6 VRF system. (2) Make sure that the unit pipeline system is free of refrigerant.
Page 297 Gree GMV6 DC Inverter VRF Units Service Manual (2) Remove the unit’s upper and bottom panels by referring to 5.1.1 Removing the Unit Panel. Removing procedure (1) Use a diagonal pliers to cut off the high temperature wire tie that is attached to the heat- shrinkable tubing of the pressure sensor.
Page 298 Gree GMV6 DC Inverter VRF Units Service Manual 1 --- high temperature wire tie 2 --- insulation cotton 3 --- temperature sensor sleeve 4 --- temperature sensor connector 5 --- temperature sensor Installation procedure (1) Connect the temperature sensor connector into the temperature sensor sleeve.
Page 299 Gree GMV6 DC Inverter VRF Units Service Manual (7) Install the unit panel. 5.14 Preparation for Removing and Installing Solenoid Valve Steps: (1) Use the power circuit breaker to switch off the power of the GMV6 VRF system. (2) Make sure that the unit pipeline system is free of refrigerant.
Page 300 Gree GMV6 DC Inverter VRF Units Service Manual (4) Install the new solenoid valve coil to the exact position. (5) Use a torque wrench to fix the solenoid valve coil. (6) Fix the wires according to the original requirements by referring to the unit wiring diagram.
Page 301 Gree GMV6 DC Inverter VRF Units Service Manual 5.16 Removing and Installing Fan Preparations (1) Use the power circuit breaker to switch off the power of the GMV6 VRF system. (2) Remove the unit’s panel, top cover and upper electrical appliance cover by referring to 5.1.1 Removing the Unit Panel.
Page 302 Gree GMV6 DC Inverter VRF Units Service Manual (2) Remove the electric heating belt. Installation procedure (1) Install the electric heating belt at the shaft of the compressor, as shown in the figure. (2) Buckle up the electric heating belt.
Page 303 Gree GMV6 DC Inverter VRF Units Service Manual (2) Remove the electrical appliance box: Use a screwdriver to remove the screw that secures the electrical appliance box and remove the electrical appliance box 2. Note: Before removing, loosen the two refrigerant tubes of the electrical box radiator.
Page 304 Gree GMV6 DC Inverter VRF Units Service Manual 1 — connection point 2 — three connection points (3, 4, 5) (7) Pull it off the compressor after using gas welding to heat the inlet and outlet pipes. Adopt nitrogen protection during welding. The nitrogen pressure is 0.5±0.1kgf/cm (relative pressure).
Page 305: Explosive View And Parts List
Gree GMV6 DC Inverter VRF Units Service Manual 6 Explosive View and Parts List 6.1 Explosive View and Parts List of GMV-224WM/G-U, GMV- 280WM/G-U and GMV-335WM/G-U Name Material code Vulnerable part * Rear Grill 016001060007 Coping 012049000050 Diversion Circle 200150060002...
Page 306 Gree GMV6 DC Inverter VRF Units Service Manual Name Material code Vulnerable part * Left Side Plate Sub-Assy 017037060016P Chassis Sub-Assy 017000000334P Oil Separator 035028060002 Electromagnetic Valve 43000072 Electromagnetic Valve 072008000005 Strainer 07222025 Cut off Valve 0733410001301 Cut off Valve...
Page 307 Gree GMV6 DC Inverter VRF Units Service Manual 6.2 Explosive View and Parts List of GMV-400WM/G-U, GMV- 450WM/G-U and GMV-504WM/G-U Name Material code Vulnerable part * Rear Grill 016001060013 Coping 012049000059P Diversion Circle 200150000011 Axial Flow Fan 103002060011 Brushless DC Motor...
Page 308 Gree GMV6 DC Inverter VRF Units Service Manual Name Material code Vulnerable part * Electronic Expansion Valve 43044100172 Bidirection Strainer 07220016 Gas Tube Filter 072190511 Electromagnetic Valve 43044100224 Base Plate Sub-Assy 017000060119P Oil Separator 035028060002 Cut off Valve 0733410005301 Cut off Valve...
Page 309 Gree GMV6 DC Inverter VRF Units Service Manual 6.3 Explosive View and Parts List of GMV-560WM/G-U, GMV- 615WM/G-U and GMV-680WM/G-U Name Code Vulnerable part * Rear Grill 016001060013 Coping 012049000059P Diversion Circle 200150000011 Axial Flow Fan 103002060011 Brushless DC Motor...
Page 310 Gree GMV6 DC Inverter VRF Units Service Manual Name Code Vulnerable part * Electromagnetic Valve 43000072 Strainer 07415200002 Oil Separator 035028060002 Cut off Valve 0733410005301 Cut off Valve 0733410001401 Strainer 07222025 Electromagnetic Valve 072008000005 Gas-liquid Separator 035027060004 Nozzle for Adding Freon...
Page 311: Appendixes
Gree GMV6 DC Inverter VRF Units Service Manual Appendixes Appendix 1 Temperature Senor Resistance and Temperature Relationship Table Environmental temperature sensor 15kΩ resistance ~ voltage correspondence table (including outdoor and indoor environment temperature sensors) Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C)
Page 312 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 20.54 1.393 0.779 3.137 19.63 1.429 0.758 3.141 18.75 1.467 0.737 3.145 17.93 1.503 0.717 3.15 17.14 1.54 0.697 3.153 16.39...
Page 313 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 3.217 2.717 0.248 3.246 3.105 2.734 0.243 3.247 2.998 2.75 0.237 3.249 2.898 2.766 0.232 3.25 2.797 2.781 0.227 3.251 2.702...
Page 314 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 59.08 0.835 1.427 3.08 56.19 0.866 1.386 3.086 53.46 0.898 1.346 3.092 50.87 0.931 1.307 3.098 48.42 0.965 1.269 3.103 46.11...
Page 315 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 8.051 2.353 0.4289 3.231 7.745 2.379 0.4187 3.232 7.453 2.404 0.4088 3.234 7.173 2.429 0.3992 3.235 6.905 2.453 0.3899 3.237 6.648...
Page 316 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 259.37 0.123 5.7457 2.096 245.61 0.129 5.5647 2.12 232.67 0.136 5.3903 2.144 220.5 0.143 5.2223 2.168 209.05 0.151 5.0605 2.191 195.97...
Page 317 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 30.787 0.809 1.5996 2.845 29.544 0.835 1.5602 2.855 28.359 0.86 1.522 2.864 27.227 0.886 1.485 2.873 26.147 0.913 1.449 2.882 25.114...
Page 318: Appendix 2 Refrigerant Temperature And Pressure Table
Gree GMV6 DC Inverter VRF Units Service Manual Appendix 2 Refrigerant Temperature and Pressure Table Refrigerant: R410A Corresponding Corresponding Corresponding Temperature Temperature Temperature saturation saturation saturation (°C) (°C) (°C) pressure (BAR) pressure (BAR) pressure (BAR) 1.54 5.96 16.4 1.61 6.16 16.9...
Page 319: Appendix 3 Pressure Sensor Voltage And Pressure Table
Gree GMV6 DC Inverter VRF Units Service Manual Appendix 3 Pressure Sensor Voltage and Pressure Table High-pressure sensor features (R410A) Temperature Absolute pressure Temperature Absolute pressure Voltage (V) Voltage (V) (°C) (kPA) (°C) (kPA) 0.102 1300 0.111 1337 1.34 0.12 1375 1.38...
Page 320 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Absolute pressure Temperature Absolute pressure Voltage (V) Voltage (V) (°C) (kPA) (°C) (kPA) 0.828 3686 3.844 0.857 3767 3.93 0.887 3849 4.018 0.917 3932 4.106 0.947 4017 4.197 0.979 4103 4.288 1030 1.012...
Page 321 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Absolute pressure Temperature Absolute pressure Voltage (V) Voltage (V) (°C) (kPA) (°C) (kPA) 0.619 1228 2.753 0.633 1263 2.823 0.649 1300 2.897 0.665 1337 2.971 0.683 1375 3.047 0.701 1413 3.123 0.719...
Page 322: Appendix 4 Electric Specifications
Gree GMV6 DC Inverter VRF Units Service Manual Appendix 4 Electric Specifications Every unit should have corresponding short-circuit and overload protection. And also a main switch is required to control Power or disconnection. Please refer to the following table for the leakage protection switch and circuit breaker of outdoor unit.
Page 323 Gree GMV6 DC Inverter VRF Units Service Manual Cross-sectional Maximum Minimum Circuit Power Fuse Capacity Overcurrent Area of Power Ampacity Outdoor units Combination Protection Cable Conductor V/Ph/Hz mm² GMV- 440~460V 615+615 40+40 38.0+38.0 40+40 4*6.0+4*6.0 1230WM/G-U 3~ 60Hz GMV- 440~460V...
Page 324: Appendix 5 Circuit Diagram
Gree GMV6 DC Inverter VRF Units Service Manual Appendix 5 Circuit Diagram GMV-224WM/G-U, GMV-280WM/G-U and GMV-335WM/G-U...
Page 325 Gree GMV6 DC Inverter VRF Units Service Manual GMV-400WM/G-U, GMV-450WM/G-U and GMV-504WM/G-U...
Page 326 Gree GMV6 DC Inverter VRF Units Service Manual GMV-560WM/G-U, GMV-615WM/G-U and GMV-680WM/G-U Note: Refer to the mark on the unit for the actual circuit diagram.
Page 327: Appendix 6 Schematic Diagram
Gree GMV6 DC Inverter VRF Units Service Manual Appendix 6 Schematic Diagram The outdoor unit of GMV6 multi VRF unit can be realized by parallel combination of modules, and the indoor unit can also be composed of multiple units in parallel. The working principle is as follows: when the indoor unit is running in the cooling mode, the outdoor unit starts the outdoor module according to the running load demand of the indoor unit.
Page 328 Gree GMV6 DC Inverter VRF Units Service Manual System principle diagram of GMV-400WM/G-U, GMV-450WM/G-U and GMV-504WM/G-U...
Page 329 Gree GMV6 DC Inverter VRF Units Service Manual System principle diagram of GMV-560WM/G-U, GMV-615WM/G-U and GMV-680WM/G-U...
Page 330: Appendix 7 Names And Functions Of Components
Gree GMV6 DC Inverter VRF Units Service Manual Appendix 7 Names and Functions of Components Name Main Functions The compressor changes its speed according to the actual system need for Compressor capacity adjustment. Electrical heating belt of In the standby state, the oil temperature of the compressor is guaranteed to the compressor prevent backflow.
Page 331 JF00304610...

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Gree GMV6 Series Service Manual

Chapter 1 Product

Chapter 2 Commissioning

Chapter 3 Faults

Chapter 4 Maintenance

Appendix 1 Temperature Senor Resistance and Temperature Relationship Table

Appendix 2 Refrigerant Temperature and Pressure Table

Appendix 3 Pressure Sensor Voltage and Pressure Table

Appendix 4 Electric Specifications

Appendix 5 Circuit Diagram

Appendix 6 Schematic Diagram

Appendix 7 Names and Functions of Components

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