Page 1 AMV6 DC Inverter VRF Units Service manual Capacity: 22.4kW~246.0kW Rated Frequency: 50Hz / 60Hz Operation Range: Cooling: -5~55°C Heating: -30~24°C 2021 v.
Page 2: Table Of Contents
Gree GMV6 DC Inverter VRF Units Service Manual Contents Chapter 1 Product ............2 1 Unit List ..............2 2 Parameters .............. 3 3 The Range of Production Working Temperature ....... 8 Chapter 2 Commissioning ..........10 1 Commissioning Process ..........10 2 Safety Requirements .............
Page 3 Gree GMV6 DC Inverter VRF Units Service Manual 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 CN851W3040 GMV-224WM/H-X 380-415V 3N~ 50/60Hz CN851W2900 GMV-280WM/H-X 380-415V 3N~ 50/60Hz CN851W2910 GMV-335WM/H-X 380-415V 3N~ 50/60Hz CN851W3050 GMV-400WM/H-X 380-415V 3N~ 50/60Hz CN851W2930 GMV-450WM/H-X...
Page 5: Parameters
Gree GMV6 DC Inverter VRF Units Service Manual 2 Parameters 2.1 Parameters of Basic Modules Model GMV-224WM/H-X GMV-280WM/H-X GMV-335WM/H-X GMV-400WM/H-X Product Code CN851W3040 CN851W2900 CN851W2910 CN851W3050 Cooling capacity Rated 22.4 33.5 Rated 16.2 16.2 18.5 23.32 Heating capacity Max. 31.5 37.5 Outdoor static pressure 0-110...
Page 6 Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-450WM/H-X GMV-504WM/H-X GMV-560WM/H-X GMV-615WM/H-X Compressor quantity Refrigeration oil No. of compressor FV68H FV68H FV68H FV68H Gross Compressor Refrigeration oil charge 1.1×2 1.1×2 charge The others Cooling operation range °C -5~55 -5~55 -5~55 -5~55 Heating operation range...
Page 7 Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-950WM/H-X GMV-1015WM/H-X GMV-1065WM/H-X GMV-1119WM/H-X 12+22 14+22 16+22 18+22 Combination GMV-335WM/H-X+ GMV-400WM/H-X+ GMV-450WM/H-X+ GMV-504WM/H-X+ mode GMV-615WM/H-X GMV-615WM/H-X GMV-615WM/H-X GMV-615WM/H-X Cooling Rated 101.5 106.5 111.9 capacity Rated 51.5 56.32 56.32 Heating capacity Max. 106.5 125.5 Outdoor static...
Page 8 Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-1400WM/H-X GMV-1455WM/H-X GMV-1510WM/H-X GMV-1565WM/H-X 12+16++22 10+20+22 10+22+22 12+22+22 Combination GMV-335WM/H-X+ GMV-280WM/H-X+ GMV-280WM/H-X+ GMV-335WM/H-X+ mode GMV-450WM/H-X+ GMV-560WM/H-X+ GMV-615WM/H-X+ GMV-615WM/H-X+ GMV-615WM/H-X GMV-615WM/H-X GMV-615WM/H-X GMV-615WM/H-X Cooling Rated 145.5 156.5 capacity Rated 74.82 80.2 82.2 84.5 Heating capacity...
Page 9 Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-1845WM/H-X GMV-1905WM/H-X GMV-1959WM/H-X GMV-2015WM/H-X 22+22+22 10+16+20+22 10+18+20+22 10+20+20+22 GMV-280WM/H-X+ GMV-280WM/H-X+ GMV-280WM/H-X+ GMV-615WM/H-X+ Combination mode GMV-450WM/H-X+ GMV-504WM/H-X+ GMV-560WM/H-X+ GMV-615WM/H-X+ GMV-560WM/H-X+ GMV-560WM/H-X+ GMV-560WM/H-X+ GMV-615WM/H-X GMV-615WM/H-X GMV-615WM/H-X GMV-615WM/H-X Cooling Rated 184.5 190.5 195.9 201.5 capacity Rated 103.52...
Page 10: The Range Of Production Working Temperature
Gree GMV6 DC Inverter VRF Units Service Manual Model GMV-2070WM/H-X GMV-2125WM/H-X GMV-2180WM/H-X GMV-2245WM/H-X 930×775×1690+ 930×775×1690+ 930×775×1690+ 1340×775×1690+ Outline dimensions 1340×775×1690+ 1340×775×1690+ 1340×775×1690+ 1340×775×1690+ (W × D × H) 1340×775×1690+ 1340×775×1690+ 1340×775×1690+ 1340×775×1690+ 1340×775×1690 1340×775×1690 1340×775×1690 1340×775×1690 1000×830×1855+ 1000×830×1855+ 1000×830×1855+ 1400×830×1855+ Packing 1400×830×1855+ 1400×830×1855+...
Page 11 Gree GMV6 DC Inverter VRF Units Service Manual ④ The above parameters are tested based on the standard connection pipe length. In the actual project, the parameters should be corrected referring to the capacity correction for the long connection pipe of units. ⑤...
Page 12: Chapter 2 Commissioning
Gree GMV6 DC Inverter VRF Units Service Manual Chapter 2 Commissioning WARNING! 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 13: 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 14 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. Minutes of the commissioning scheme determining meeting: Minutes of the commissioning scheme determining meeting for XXX project: Theme: xxx...
Page 15 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 (m): (kW): (kW): Maximum drop between the indoor Supplemented refrigerant (kg): unit and outdoor...
Page 16 Gree GMV6 DC Inverter VRF Units Service Manual 3.1.3 Checking NOTE! 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 Qualified Category Item...
Page 17 Gree GMV6 DC Inverter VRF Units Service Manual Checklist Before GMV6 Commissioning Qualified Category Item Reference Value Inspector The inclination of indoor and Branch joints need to be outdoor branch joints should not installed horizontally. Refer exceed the specified requirements. to branch joint installation.
Page 18 Gree GMV6 DC Inverter VRF Units Service Manual Checklist Before GMV6 Commissioning Qualified Category Item Reference Value Inspector Is there any strong electromagnetic interference, dust, acid and alkaline — gas in the environment where the unit is located? Does the communication cable —...
Page 19 Gree GMV6 DC Inverter VRF Units Service Manual 3.2 Debugging and Operation 3.2.1 Precautions (1) Do set one (only one) module as the main module during debugging. (2) When there is no special requirement, the other functions do not need to be set, and it can be operated according to the factory settings.
Page 20 Gree GMV6 DC Inverter VRF Units Service Manual (12) Button description: Short press: press the button for 3s and then release it; Hold the button for 5s: press the button for 5-10s and then release it; Hold the button for 10s: press the button for 10s and then release it. 3.2.2 Basic Introduction for Engineering Debugging 3.2.2.1 Debugging Method DC inverter multi VRF unit has three debugging methods at present:...
Page 21 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 system is conducting the address Flash assignment.
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 10_ status Starting up the operation.
Page 23 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 24 Gree GMV6 DC Inverter VRF Units Service Manual — Debugging code Progress code Status code LED1 LED2 LED3 Progress Display Display Display Code Code Code status status status 03_module quantity confirmation Note: It is important to confirm that the number of online outdoor unit modules is the same as that of actual modules;...
Page 25 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 26 Gree GMV6 DC Inverter VRF Units Service Manual If an abnormality is detected, it will stay in the current state and manual troubleshooting is required. The corresponding faults are as below: — Debugging code Progress code Status code LED1 LED2 LED3 Meaning Progress...
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 refrigerant in the system is 09_refrigerant insufficient. Please charge judgement before refrigerant until the fault startup disappears.
Page 28 Gree GMV6 DC Inverter VRF Units Service Manual Step 16: After the unit debugging method is confirmed, the system automatically selects cooling or heating mode according to the ambient temperature. Once cooling/heating mode is selected, the relevant display is as below. Debugging —...
Page 29 Gree GMV6 DC Inverter VRF Units Service Manual follows: Master unit setting (SA8): Master and Slave DIP Switch (Two Digits) Unit Setting Position Master unit Slave unit Step 4: Power on the indoor and outdoor units. Power on all indoor and outdoor units. In this case, all modules of the outdoor unit indicate that the unit is in "Not commissioning"...
Page 30 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 Blinks Blinks Blinks Blinks Blinks Blinks After selecting the corresponding basic module, press the SW3 confirm button. The module displays as follows.
Page 31 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 32 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 33 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 34 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 35 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 36 Gree GMV6 DC Inverter VRF Units Service Manual Note: 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 37 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 38 Gree GMV6 DC Inverter VRF Units Service Manual 3.2.7 Reference Values of Unit Normal Operation Parameters (Commissioning Check) Reference Values of Commissioning Parameters of the DC Inverter VRF Air-conditioning Unit Parameter Commissioning Item Unit Reference Value Remarks Name Outdoor ambient °C —...
Page 39 Gree GMV6 DC Inverter VRF Units Service Manual Reference Values of Commissioning Parameters of the DC Inverter VRF Air-conditioning Unit Parameter Commissioning Item Unit Reference Value Remarks Name ●In heating mode, the opening of the expansion valve electronic expansion valve can be adjusted between 0PLS and 3000PLS.
Page 40: 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 SA1_capacity switch capacity of the unit.
Page 41 Gree GMV6 DC Inverter VRF Units Service Manual refrigerating systems as follows: Address No. DIP1 DIP2 DIP3 DIP4 DIP5 × × × × × × × × × × × × × × × Note: ① DIP switch at the ON end indicates 0; ②...
Page 42 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. White lever position White lever...
Page 43 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 Refrigerant on the system pressure change, This function can — — recycle this function recycles all or partial only be set.
Page 44 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 45 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 Blinks Blinks After-sales vacuum pumping...
Page 46 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 47 Gree GMV6 DC Inverter VRF Units Service Manual Basic module refrigerant recycle: Step 3: Set the basic module that needs refrigerant recycle to emergency status, close the liquid 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...
Page 48 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 Blinks Blinks Step 3: After selecting the mode, press the SW3 confirm button. The master module displays as follows: LED1 LED2...
Page 49 Gree GMV6 DC Inverter VRF Units Service Manual Silence Mode Code Noise Level Mode 10 Low noise Mode 11 Medium-low noise Mode 12 Ultra low noise Note: After a silence mode is set, the system capability will be attenuated. Therefore, the noise and the capability need to be balanced when a silence mode is selected.
Page 50 Gree GMV6 DC Inverter VRF Units Service Manual Press the SW4 back button on the master module to return to the previous process or exit the function setting status. The default status is 00, that is, no silence. 4.2.3.4 A8 After-Sales Vacuum Pumping Mode Introduction: This function is used to ensure the vacuum of the entire system during maintenance and to avoid dead pipeline zones.
Page 51 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 Step 3: After selecting the mode, press the SW3 confirm button. The master unit displays as follows: LED1 LED2...
Page 52 Gree GMV6 DC Inverter VRF Units Service Manual Code Maximum Output Capability Note: After the capability limit is set, the cooling or heating effect is correspondingly reduced. Setting steps: Step 1: Enter n4 maximum output capability limit setting, and ensure that the master unit displays as follows: LED1 LED2...
Page 53 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 Step 2: Press the SW3 confirm button to send the engineering number offset instruction. The master module displays as follows: LED1 LED2...
Page 54 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Function code Display status Mode Display status Current status Display status Blinks Blinks Blinks After selecting the corresponding static pressure mode for the outdoor unit, press the SW3 confirm button.
Page 55 Gree GMV6 DC Inverter VRF Units Service Manual the one-button drainage status is set to on (one-button drainage is enabled), the one-button drainage code is automatically recovered to OF after 60 minutes. 4.2.3.11 C8 Compressor Failure Emergency Operation This function is after-sales emergency setting when a compressor works abnormally. It shields the abnormal compressor in a short time to ensure the emergency operation of other compressors.
Page 56 Gree GMV6 DC Inverter VRF Units Service Manual NOTES! ① A module can set only one compressor to emergency mode; ② The compressor emergency operation mode is valid only in single-module multi-compressor system; ③ The default status is 00. ④ The system cannot run continuously for more than 24 hours in compressor emergency operation status.
Page 57 Gree GMV6 DC Inverter VRF Units Service Manual If you do not press any button in 5 minutes, the system will automatically exit the current screen and the unit will resume displaying the current status. If a basic module sets compressor failure emergency operation, the status indicators and LEDs on the module indicate the corresponding status.
Page 58 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Function code Display status Mode Display status Current status Display status Modules not shielded display as follows: LED1 LED2 LED3 Function code Display status Mode Display status Current status Display status Press the SW4 back button.
Page 59 Gree GMV6 DC Inverter VRF Units Service Manual displayed as follows: LED1 LED2 LED3 Function code Display status Current process Display status Current status Display status At this time, if there is no button operation on the main control machine for 5 minutes, it will exit automatically and the unit will resume the current state display.
Page 60 Gree GMV6 DC Inverter VRF Units Service Manual 4.2.3.16 1H Efficient Module Rotation Setting steps: Enter the function setting. The master unit displays as follows by default, and other basic modules display normal working status: LED1 LED2 LED3 Function code Display status Current process Display status...
Page 61 Gree GMV6 DC Inverter VRF Units Service Manual The master unit memorizes this setting and does not clear it even upon power failure and power-on again. The default value is 00. After the entire system is commissioned, the commissioner sends a flag, indicating whether the adaptive control of noise is valid.
Page 62 Gree GMV6 DC Inverter VRF Units Service Manual removal mode. LED1 LED2 LED3 Function code Display status Current process Display status Current status Display status Blinks Blinks Blinks Blinks Blinks Blinks After selecting the corresponding value, press the SW3 confirm button. The master module displays as follows: LED1 LED2...
Page 63 Gree GMV6 DC Inverter VRF Units Service Manual 4.2.4 Outdoor Unit Status Query The following functions can be queried: Function Code Function Name Fault query Parameter query Indoor unit engineering SN query Online indoor unit qty query Outdoor unit barcode query After the unit is powered, you can query the function setting status, historical fault record, indoor unit engineering number and real-time parameter of the unit in any status.
Page 64 Gree GMV6 DC Inverter VRF Units Service Manual Temperature sensor fault of the inverter Over high pressure ratio protection compressor driver module. Charging loop fault of the inverter compressor Four-way valve air backflow protection driver. Under voltage protection for DC bus of the High pressure low protection inverter outdoor fan driver Over voltage protection for DC bus of the inverter...
Page 65 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Function Code Display status Module address Display status Current status Display status Blinks Blinks Blinks Blinks Blinks Blinks Blinks Blinks Press the SW1 up button and the SW2 down button to select the corresponding query module, and press the SW3 confirm button.
Page 66 Gree GMV6 DC Inverter VRF Units Service Manual Parameter Code Parameter Name Remarks The displayed value is the integer value of the Subcooler EEV actual value divided by 10. Defrost temperature Defrost temperature 1 is used. — Subcooler's liquid outlet temperature —...
Page 67 Gree GMV6 DC Inverter VRF Units Service Manual Press and hold the SW4 back button on the master unit for over 5 seconds to make all indoor units exit displaying the engineering numbers and return to the upper operation level. If you do not press any button on the master unit to exit indoor unit engineering SN query in 30 minutes, the system will automatically exit the current screen and the unit will resume displaying the current status.
Page 68 Gree GMV6 DC Inverter VRF Units Service Manual LED1 LED2 LED3 Function Code Display status Parameter Code Display status Current status Display status Un/Pc Blinks Blinks Note: Un indicates the unit barcode, while Pc indicates the controller barcode. After confirming the module, press the SW1 up button and the SW2 down button to select the barcode sequence.
Page 69 Gree GMV6 DC Inverter VRF Units Service Manual If there are two levels of menus on the master unit, you can press the SW4 back button to return to the previous level. Press the SW4 query button again to exit query status. If you do not press any button on the master unit in 5 minutes, the system will automatically exit the current screen and the unit will resume displaying the current status.
Page 70: 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 Mode conflict No main IDU For single control over multiple units,...
Page 71 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 Malfunction of high-pressure sensor Malfunction of discharge temperature Malfunction of low-pressure sensor...
Page 72 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 Desynchronizing protection of inverter Malfunction of drive storage chip of compressor...
Page 73 Gree GMV6 DC Inverter VRF Units Service Manual Error Error — Content Content Code 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 Alarm because valve is abnormal compressor Malfunction of pipeline for IDU...
Page 74: Troubleshooting
Gree GMV6 DC Inverter VRF Units Service Manual 2 Troubleshooting WARNING! 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. 2.1 "A0"...
Page 75 Gree GMV6 DC Inverter VRF Units Service Manual heating mode, the indoor fan will stop working for 5 to 10 minutes. 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.
Page 76 Gree GMV6 DC Inverter VRF Units Service Manual This is a status code. It indicates that the system has entered cooling mode. 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.
Page 77 Gree GMV6 DC Inverter VRF Units Service Manual display 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 78 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 contains forei gn matters? Whether th e tempera tur e Replace th e tempera tur e...
Page 79 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 contains forei gn matters? Whether th e tempera tur e Replace th e tempera tur e...
Page 80 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 contains forei gn matters? Whether th e tempera tur e Replace th e tempera tur e...
Page 81 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 Remove the foreign terminal between the main boa rd and matters and plug it tightly temperature sensor gets loose or contains forei gn matters? Whether th e tempera tur e...
Page 82 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 matters and plug it tightly contains forei gn matters? Whether th e tempera tur e...
Page 83 Gree GMV6 DC Inverter VRF Units Service Manual "b6" Suction Te mp erature 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 contains forei gn matters? Whether th e tempera tur e Replace th e tempera tur e...
Page 84 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 contains forei gn matters? Whether th e tempera tur e Replace th e tempera tur e...
Page 85 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 contains forei gn matters? Whether th e tempera tur e Replace th e tempera tur e...
Page 86 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 matters and plug it tightly contains forei gn matters? Whether th e tempera tur e...
Page 87 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 contains forei gn matters? Whether th e tempera tur e Replace th e tempera tur e...
Page 88 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 cables properly the indoor unit and the wired controller are incorrectly connected...
Page 89 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 cables properly are connected properly? Whether the outdoor unit's...
Page 90 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 are connected properly? Whether the outdoor unit's Replace the fan drive board...
Page 91 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 connected properly?
Page 92 Gree GMV6 DC Inverter VRF Units Service Manual 2.32 "C6" Alarm on Inconsistent Number of Outdoor Units Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit 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 93 Gree GMV6 DC Inverter VRF Units Service Manual Fault diagnosis: If any fan is set to emergency operation mode, the main board displays the code during the operation, indicating that the unit's fan has entered emergency operation. Possible causes: -- Troubleshooting: not required.
Page 94 Gree GMV6 DC Inverter VRF Units Service Manual Re-engineer the unit to increase indoor unit capacity or decrease outdoor unit capacity. 2.38 "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 95 Gree GMV6 DC Inverter VRF Units Service Manual Troubleshooting: "CF" Multi-master Units Fault Make sure that o nly one maste r Whether DIP switch is diale d unit exi sts in the networ k. Afte r prop erly for th e master u nit (SA8) redi aling, power on the rediale d among all the mo dules i n module s agai n...
Page 96 Gree GMV6 DC Inverter VRF Units Service Manual 2.41 "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. Possible causes: ■...
Page 97 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 on aga in? Whether th ere are more tha n Make sure that the number of indoor...
Page 98 Gree GMV6 DC Inverter VRF Units Service Manual "d3" Ambien t Temp erature Sen sor Fault Whether th e i nter face terminal between the main boa rd Remove the foreign and ambie nt temperature sensor g ets loose matters and plug it tightly or contains foreig n matters? Is th e p roblem so lve d after the ambient tempera ture sensor...
Page 99 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 matters and plug it tightly or contains foreig n matters? Is th e p roblem so lve d after...
Page 100 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 contains forei gn matters? Is th e p roblem so lve d after the outlet pipe temperature sensor...
Page 101 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 contains forei gn matters? Is th e p roblem so lve d after the humidity sensor is re placed?
Page 102 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? Replace th e corre sp onding Whether th e j ump er cap is jumper cap...
Page 103 Gree GMV6 DC Inverter VRF Units Service Manual 2.52 "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 104 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? The detection circuit is Replace th e main control abn ormal...
Page 105 Gree GMV6 DC Inverter VRF Units Service Manual 2.55 "dE" Indoor CO2 Sensor Fault (Reserved) 2.56 "db" Engineering Commissioning 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 but not a fault code. It indicates that the unit is being commissioned and the indoor unit is not operational.
Page 106 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? outdoo r un it pressure gauge system) is above 4.2 MPa?
Page 107 Gree GMV6 DC Inverter VRF Units Service Manual 2.58 "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 108 Gree GMV6 DC Inverter VRF Units Service Manual After confirming that the EXV coil is connected properly, power off the unit. Then power on to reset the unit and check the resetting action. If unable to reset the unit, replace the coil or the main board. If able to reset the unit normally, inspect other parts of the unit.
Page 109 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 Is there too little refrigerant in the amount as required by the system?
Page 110 Gree GMV6 DC Inverter VRF Units Service Manual 2.60 "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 operation.
Page 111 Gree GMV6 DC Inverter VRF Units Service Manual 2.61 "F0" Poor Main Board of Outdoor Unit Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: Check whether the address chip, memory chip and clock chip of the main board of the outdoor unit can be read properly.
Page 112 Gree GMV6 DC Inverter VRF Units Service Manual 2.62 "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 113 Gree GMV6 DC Inverter VRF Units Service Manual 2.63 "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 114 Gree GMV6 DC Inverter VRF Units Service Manual 2.64 "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 115 Gree GMV6 DC Inverter VRF Units Service Manual 2.65 "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 116 Gree GMV6 DC Inverter VRF Units Service Manual 2.66 "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 117 Gree GMV6 DC Inverter VRF Units Service Manual 2.67 "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 118 Gree GMV6 DC Inverter VRF Units Service Manual 2.68 "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 119 Gree GMV6 DC Inverter VRF Units Service Manual 2.69 "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 120 Gree GMV6 DC Inverter VRF Units Service Manual 2.70 "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 121 Gree GMV6 DC Inverter VRF Units Service Manual 2.71 "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 122 Gree GMV6 DC Inverter VRF Units Service Manual 2.72 "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 123 Gree GMV6 DC Inverter VRF Units Service Manual 2.73 "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 124 Gree GMV6 DC Inverter VRF Units Service Manual 2.74 "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 125 Gree GMV6 DC Inverter VRF Units Service Manual 2.75 "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 126 Gree GMV6 DC Inverter VRF Units Service Manual 2.76 "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 127 Gree GMV6 DC Inverter VRF Units Service Manual 2.77 "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 128 Gree GMV6 DC Inverter VRF Units Service Manual 2.78 "H0" Fan Drive Board Fault Fault display: wired controller of indoor unit displays Fault diagnosis: Check the fault code displayed on the wired controller of the indoor unit. If the wired controller displays HO, 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 fan drive board.
Page 129 Gree GMV6 DC Inverter VRF Units Service Manual unit displays H6); ■ Inverter fan over-current protection (2-digit digital LED of the main control board of the outdoor unit displays H5); ■ Communication fault of fan drive (2-digit digital LED of the main control board of the outdoor unit displays C3).
Page 130 Gree GMV6 DC Inverter VRF Units Service Manual 2.81 "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 131 Gree GMV6 DC Inverter VRF Units Service Manual 2.82 "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 132 Gree GMV6 DC Inverter VRF Units Service Manual 2.83 "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 133 Gree GMV6 DC Inverter VRF Units Service Manual 2.84 "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 134 Gree GMV6 DC Inverter VRF Units Service Manual 2.85 "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 135 Gree GMV6 DC Inverter VRF Units Service Manual 2.86 "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 136 Gree GMV6 DC Inverter VRF Units Service Manual 2.87 "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 137 Gree GMV6 DC Inverter VRF Units Service Manual "HH" Over Voltage Pro tection for the DC Bus of Fan Drive Whether th e i nput voltage of the unit Chang e the volta ge to exceeds 460V? 380V The fan dr ive boa rd is Replace th e fan drive board abn ormal 2.89 "HL"...
Page 138 Gree GMV6 DC Inverter VRF Units Service Manual 2.90 "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 139 Gree GMV6 DC Inverter VRF Units Service Manual 2.91 "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 Fault diagnosis: In a multi-module system, the fault of any module will cause any other properly operating modules to display the fault code.
Page 140 Gree GMV6 DC Inverter VRF Units Service Manual "J1" Compressor 1 Over-current Protection Power on aga in the units based on th e capa city and nu mb er o f indoo r u nits enable d previou sly in the case o f protection state If th e h igh pressu re valu e of the unit is still abo ve 60°C when the compre ssor...
Page 141 Gree GMV6 DC Inverter VRF Units Service Manual 2.93 "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 142 Gree GMV6 DC Inverter VRF Units Service Manual 2.94 "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 143 Gree GMV6 DC Inverter VRF Units Service Manual 2.95 "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 144 Gree GMV6 DC Inverter VRF Units Service Manual 2.96 "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 145 Gree GMV6 DC Inverter VRF Units Service Manual 2.97 "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 146 Gree GMV6 DC Inverter VRF Units Service Manual 2.98 "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 147 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? Whether th e voltage at the output of the main boar d is normal? (If th e voltage at the output does n ot Replace th e main control...
Page 148 Gree GMV6 DC Inverter VRF Units Service Manual 2.99 "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 149 Gree GMV6 DC Inverter VRF Units Service Manual 2.100 "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 150 Gree GMV6 DC Inverter VRF Units Service Manual NOTES! ① If the enquired IDU is normal, no fault code will be displayed in the temperature area; if the unit indoor has multiple faults, fault codes will be displayed in the temperature area at an interval of 3 seconds.
Page 151 Gree GMV6 DC Inverter VRF Units Service Manual 2.102 "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 152 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 153 Gree GMV6 DC Inverter VRF Units Service Manual 2.103 "L2" E-heater Protection (Reserved Code, Not Yet Applied) 2.104 "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 154 Gree GMV6 DC Inverter VRF Units Service Manual 2.105 "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 155 Gree GMV6 DC Inverter VRF Units Service Manual 2.106 "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 156 Gree GMV6 DC Inverter VRF Units Service Manual 2.107 "L6" Mode Conflict 2.108 "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. Possible causes: ■...
Page 157 Gree GMV6 DC Inverter VRF Units Service Manual 2.109 "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 158 Gree GMV6 DC Inverter VRF Units Service Manual 2.111 "LH" Poor Air Quality Alarm (Reserved Code, Not Yet Applied) 2.112 "LC" Unmatched Models of Indoor and Outdoor Units Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: some indoor units Fault diagnosis: The unit triggers the fault of "unmatched indoor and outdoor units"...
Page 159 Gree GMV6 DC Inverter VRF Units Service Manual 2.115 "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 160 Gree GMV6 DC Inverter VRF Units Service Manual 2.119 "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. Possible causes: -- Troubleshooting: not required.
Page 161 Gree GMV6 DC Inverter VRF Units Service Manual 2.124 "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. 2.125 "P0"...
Page 162 Gree GMV6 DC Inverter VRF Units Service Manual ■ Inverter compressor over-current protection (2-digit digital LED of the main control board of the outdoor unit displays P5); ■ IPM module protection for the compressor drive (2-digit digital LED of the main control board of the outdoor unit displays P6);...
Page 163 Gree GMV6 DC Inverter VRF Units Service Manual "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? Replace th e compre ssor drive The co mpr essor drive boar d boa rd...
Page 164 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 compressor is normal (generally less than 2 ohms)? Replace th e Whether the resistance values are equal to each other?
Page 165 Gree GMV6 DC Inverter VRF Units Service Manual 2.130 "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 166 Gree GMV6 DC Inverter VRF Units Service Manual 2.131 "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 167 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 module is coa ted with thermal upo n p owe r-on? grea se...
Page 168 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 pha ses of compressor wires a re con nected pro perly? Whether the resistance...
Page 169 Gree GMV6 DC Inverter VRF Units Service Manual 2.134 "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 170 Gree GMV6 DC Inverter VRF Units Service Manual "PH" Over Voltage Pro tection for the DC Bus of Compre ssor Drive r Whether th e i nput voltage of the Chang e the volta ge to unit excee ds 460V? 380V The co mpr essor drive Replace th e compre ssor...
Page 171 Gree GMV6 DC Inverter VRF Units Service Manual If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is PJ, it indicates the inverter compressor startup failure. Possible causes: ■ Poor contact of compressor's UVW cables; ■...
Page 172 Gree GMV6 DC Inverter VRF Units Service Manual 2.138 "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 173 Gree GMV6 DC Inverter VRF Units Service Manual 2.140 "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 174 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 2.142 "U6" Abnormal Valve Prompt Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: During commissioning process, determine whether the check valve of the outdoor unit is open by...
Page 175 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 confirming that the EXV coil of the indoor unit is connected or main board properly, power off the unit.
Page 176 Gree GMV6 DC Inverter VRF Units Service Manual 2.145 "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 177 Gree GMV6 DC Inverter VRF Units Service Manual ■ The unit pipes are clogged. ■ 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 Ope n the check valve u ntil...
Page 178 Gree GMV6 DC Inverter VRF Units Service Manual 2.149 No Faults Displayed But Compressor Not Starting in Cooling/Heating Mode Fault: no faults displayed but compressor not starting in cooling/heating mode Fault diagnosis: Commission the multi-functional debugger. If any high pressure/discharge temperature/shell roof temperature of the unit falls within the following range before the unit starts operation, replace the corresponding components.
Page 179: Non-Fault Type Troubleshooting
Gree GMV6 DC Inverter VRF Units Service Manual 3 Non-fault Type Troubleshooting 3.1 The Unit Does Not Start Problem Reason Solution No power Connect the air conditioning unit with a power Check whether the line voltage is within the The line voltage is too low specified range The unit does not start The fuse or breaker is disconnected...
Page 180: Chapter 4 Maintenance
Gree GMV6 DC Inverter VRF Units Service Manual Chapter 4 Maintenance WARNING! 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.
Page 181 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) Module capacity (kW) ② Quantity of IDU/ODU rated capacity 22.4 28.0 33.5 40.0 45.0 50.4 56.0 61.5 collocation ratio C ①...
Page 182: Refrigerant Charging Method
Gree GMV6 DC Inverter VRF Units Service Manual 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. Step 1: Connect the pipe of high pressure gauge of the pressure gauge to the detection port of liquid pipe, the pipe of low pressure gauge to the detection port of gas pipe valve, and the pipe of intermediate pressure gauge to the vacuum pump.
Page 183 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 184 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). Step 4: When it comes to the procedure of charging refrigerant, open the refrigerant tank valve and charge the residual refrigerant “m`”.
Page 185: 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 380-415V 3N~ 50/60Hz+ ①...
Page 186 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 380-415V 3N~ 50/60Hz+ ①...
Page 187 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 380-415V 3N~ 50/60Hz+ ①...
Page 188 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 380-415V 3N~ 50/60Hz+ ①...
Page 189 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. (5) Check whether the varistors on the main board and filter board are damaged.
Page 190 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. Models: GMV-224WM/H-X、GMV-280WM/H-X、GMV-335WM/H-X Circuit diagram Layout of electrical appliance box...
Page 191 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/H-X、GMV-450WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 192 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-504WM/H-X 、GMV-560WM/H-X、GMV-615WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 193 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. 4.2.2 Electrical Inspection Measure the actual temperature and resistance of the temperature sensors, and compare it with the characteristic curve of the temperature sensors to determine whether the thermocouple is normal.
Page 194 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 1.009 0.873...
Page 195 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 1.818 1.561...
Page 196 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 6.1288 5.2223...
Page 197 Gree GMV6 DC Inverter VRF Units Service Manual 4.3 Solenoid Valve Specifications Description ① The 4-way valve is used to switch between cooling mode and heating mode. If the 4-way valve is active, the unit Coils of different types are used on: works in heating mode, if the 4-way valve is inactive, the unit works in cooling mode.
Page 198 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description ① The 4-way valve is used to switch between cooling mode and heating mode. If the 4-way valve is active, the unit Coils of different types are used on: works in heating mode, if the 4-way valve is inactive, the unit works in cooling mode. ①...
Page 199 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description ① The 4-way valve is used to switch between cooling mode and heating mode. If the 4-way valve is active, the unit Coils of different types are used on: works in heating mode, if the 4-way valve is inactive, the unit works in cooling mode. ①...
Page 200 Gree GMV6 DC Inverter VRF Units Service Manual Specifications Description ① The 4-way valve is used to switch between cooling mode and heating mode. If the 4-way valve is active, the unit Coils of different types are used on: works in heating mode, if the 4-way valve is inactive, the unit works in cooling mode. ①...
Page 201 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. 4.3.2 Electrical Inspection Compare the measured coil resistance with the normal coil resistance to check whether the coil is damaged.
Page 202 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. The electronic expansion valve is used to control the flow.
Page 203 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 204 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 205 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 206 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 207 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 208 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/H-X、GMV-450WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 209 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-504WM/H-X、GMV-560WM/H-X、GMV-615WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 210 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 211 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-224WM/H-X、GMV-280WM/H-X、GMV-335WM/H-X Circuit diagram Physical position...
Page 212 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/H-X、GMV-450WM/H-X Circuit diagram Physical position...
Page 213 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-504WM/H-X、GMV-560WM/H-X、GMV-615WM/H-X Circuit diagram Physical position...
Page 214 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 215 Gree GMV6 DC Inverter VRF Units Service Manual When the compressor frequency is 60 Hz, the current curve corresponding to the evaporation temperature and condensation temperature is shown as follows: Current curve Evaporation temperature °C When the compressor frequency is 90 Hz, the current curve corresponding to the evaporation temperature and condensation temperature is shown as follows: Current curve Evaporation temperature °C...
Page 216 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: Current curve Evaporation temperature °C NOTE! When the compressor is working at another frequency, the current curve can be obtained through interpolation calculation of the above frequency.
Page 217 Gree GMV6 DC Inverter VRF Units Service Manual Current Evaporation temperature °C When the compressor frequency is 90 Hz, the current curve corresponding to the evaporation temperature and condensation temperature is shown as follows: Current Evaporation temperature °C When the compressor frequency is 120 Hz, the current curve corresponding to the evaporation temperature and condensation temperature is shown as follows: Current Evaporation temperature °C...
Page 218 Gree GMV6 DC Inverter VRF Units Service Manual NOTE! When the compressor is working at another frequency, the current curve can be obtained through interpolation calculation of the above frequency. Step 2: Check whether the running sound of the compressor is normal and whether any high-pitched sound or obvious scratch can be heard.
Page 219 Gree GMV6 DC Inverter VRF Units Service Manual Subcooling electronic expansion valve Heating electronic expansion valve Note on touching the electronic expansion valve:...
Page 220 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 221 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. Warning: high temperature! Marks are made on the 4-way valve: D indicates connection to the exhaust side, E indicates...
Page 222 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. Oil-return Oil-return valve 2...
Page 223 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 224 Gree GMV6 DC Inverter VRF Units Service Manual 12: Point the black probe to the N1 bonding pad and the red probe to V 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 225 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. Models: GMV-224WM/H-X、GMV-280WM/H-X、GMV-335WM/H-X Circuit diagram Layout of electrical appliance box...
Page 226 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/H-X、GMV-450WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 227 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-504WM/H-X 、GMV-560WM/H-X、GMV-615WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 228 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 229 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. Models: GMV-224WM/H-X、GMV-280WM/H-X、GMV-335WM/H-X Circuit diagram Layout of electrical appliance box...
Page 230 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/H-X、GMV-450WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 231 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-504WM/H-X 、GMV-560WM/H-X、GMV-615WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 232 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 233 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-224WM/H-X、GMV-280WM/H-X、GMV-335WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 234 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/H-X、GMV-450WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 235 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-504WM/H-X、GMV-560WM/H-X、GMV-615WM/H-X Circuit diagram Layout of electrical appliance box Physical position...
Page 236 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. Black probe Red probe Symptom...
Page 237 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 －...
Page 238 Gree GMV6 DC Inverter VRF Units Service Manual High-pressure sensor Low-pressure sensor...
Page 239 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-400WM/H-X、GMV-450WM/H-X Circuit diagram Layout of electrical appliance box Physical position High-pressure sensor Low-pressure sensor...
Page 240 Gree GMV6 DC Inverter VRF Units Service Manual Models: GMV-504WM/H-X、GMV-560WM/H-X、GMV-615WM/H-X Circuit diagram Layout of electrical appliance box Physical position High-pressure sensor Low-pressure sensor...
Page 241 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. (2) Switch the unit to the cooling mode.
Page 242: 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. (2) Use a tool to press the buckle shown in the figure to rotate and open the window in the bulkhead cover.
Page 243 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 ① - Right panel 3 –...
Page 244 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 245 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 setting Removing procedure (1) Check whether the unit is the master or slave module.
Page 246 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 247 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 248 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. WARNING! Check whether the models of the new and old compressors on the nameplates are the same. Check the sealing rubber blocks of components such as the oil separator and gas separator.
Page 249 Gree GMV6 DC Inverter VRF Units Service Manual The seal blocks of all the parts must be intact. WARNING! 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 250 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 251 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 252 Gree GMV6 DC Inverter VRF Units Service Manual ② Place the compressor at a position above the level of the ground, pour oil from the compressor exhaust port, and use a beverage bottle or other transparent container (with a volume of over 150 ml) to store oil.
Page 253 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 oil return pipe of the oil separator 4.
Page 254 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 and ground It is also necessary to use a transparent container to hold the impurities in the gas-liquid separator, observe the impurity color and seal the container, and return it to the factory to check the impurity...
Page 255 Gree GMV6 DC Inverter VRF Units Service Manual for further analysis. Collect the amount of compressor oil poured out from the oil separator, gas-liquid separator and oil equalizer, and make relevant records to facilitate the replacement of compressors, gas-liquid separator and other components, and adding of lubricant to the system.
Page 256 Gree GMV6 DC Inverter VRF Units Service Manual impurities from contaminating the system. Step 9: Replacing compressors 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 257 Gree GMV6 DC Inverter VRF Units Service Manual places of the respective old compressors and wired correctly. We recommend you replace the compressors one by one. CAUTION! The compressors must be wired in accordance with the wiring at the factory. The control varies by compressors.
Page 258 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 259 Gree GMV6 DC Inverter VRF Units Service Manual the pressure is above 2.43 MPa. 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 is obvious abnormality, for example, when the amount of lubricant poured out is too little or too much, empty the lubricant in the system, and then check the section 3 basic parameters of the unit in Chapter 1 to determine the amount of lubricant that needs to be recharged.
Page 260 Gree GMV6 DC Inverter VRF Units Service Manual Low pressure measurement valve Vacuum the gas and liquid valves and keep them vacuum in the oil charging process Liquid pipe pipe CAUTION! 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.
Page 261 Gree GMV6 DC Inverter VRF Units Service Manual refrigerant pressure before charging the refrigerant. The refrigerant quality can be judged according to the refrigerant saturation pressure and temperature table. The charging method is described as follows: Measure the pressure of the whole refrigerant tank, check the saturation pressure and temperature against the parameter table, and check the ambient temperature.
Page 262 Gree GMV6 DC Inverter VRF Units Service Manual 1 --- 4-way valve 2 --- 4-way valve coil 3 --- Screw Installation procedure (1) Install the new 4-way valve coil to the exact position. (2) Tighten the screw with a screwdriver to ensure that the 4-way valve coil does not rotate. 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.
Page 263 Gree GMV6 DC Inverter VRF Units Service Manual 1 ---- 4-way valve D - Gas pipe, connecting to the exhaust pipe of the cooling compressor; C - Gas pipe, connecting to the inlet pipe of the condenser. S - Gas pipe, connecting to the suction pipe of the cooling compressor; E - Gas pipe, connecting to the air return pipe of the evaporator.
Page 264 Gree GMV6 DC Inverter VRF Units Service Manual Note: When welding, do not get the other components burnt. (5) Remove the old electronic expansion valve. 1 --- Damper block 2 --- Electronic expansion valve coil 3 --- Electronic expansion valve Installation procedure (1) Install the new electronic expansion valve to the exact position.
Page 265 Gree GMV6 DC Inverter VRF Units Service Manual (9) After checking that there is no problem, buckle the front panel and tighten the screws. 5.7 Removing and Installing Oil Separator 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 266 Gree GMV6 DC Inverter VRF Units Service Manual 5.8 Removing and Installing Gas-Liquid Separator 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. (3) Remove the unit’s front panel by referring to 5.1.1 Removing the Unit Panel.
Page 267 Gree GMV6 DC Inverter VRF Units Service Manual (1) Remove the temperature sensors near the nozzles. (2) Weld and loosen the tubes connecting the four nozzles of the plate heat exchanger, and then pull the connecting tubes off. Note: When welding, do not get the other components burnt. The welding points of the plate heat exchanger are steel and copper.
Page 268 Gree GMV6 DC Inverter VRF Units Service Manual (3) Pull the plastic plug of the pressure sensor out by pressing the pressing point on the plastic plug of the pressure sensor with your hand. (4) Prepare two wrenches. Use one to fix the fluorine nozzle and the other to unscrew the metal interface of the pressure sensor.
Page 269 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. (2) Apply heat-dissipating grease to the surface of the temperature sensor and insert the temperature sensor into the temperature sensor sleeve (from bottom to top).
Page 270 Gree GMV6 DC Inverter VRF Units Service Manual (7) Install the unit panel. 5.13 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. (3) Remove the unit’s upper and bottom panels by referring to 5.1.1 Removing the Unit Panel.
Page 271 Gree GMV6 DC Inverter VRF Units Service Manual pressure). (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. (7) Make sure that the components and cables are properly connected.
Page 272 Gree GMV6 DC Inverter VRF Units Service Manual 5.15 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 273 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. (3) Connect the fan according to the original wiring.
Page 274 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. 1 —...
Page 275 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 276: 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/H-X, GMV-280WM/H-X and GMV-335WM/H-X Name Material code Vulnerable part * Rear Grill 016001060007 Coping 012049000050P Diversion Circle 200150060002 Axial Flow Fan 103002000007 Brushless DC Motor 1570412406...
Page 277 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 Strainer 07415200002 Electromagnetic Valve 43000072 Electronic Expansion Valve 072009060013 Electric Expand Valve Fitting 072002000011 Strainer 07222025 Electromagnetic Valve 072008000005...
Page 278 Gree GMV6 DC Inverter VRF Units Service Manual 6.2 Explosive View and Parts List of GMV-400WM/H-X, GMV-450WM/H-X Vulnerable part Name Material code Rear Grill 016001060013 Coping 012049000059P Axial Flow Fan 10434100002 Brushless DC Motor 1570412406 Diversion Circle 200150000011 Left Side Plate Sub-Assy 017037060016P Electric Expand Valve Fitting 072002000011...
Page 279 Gree GMV6 DC Inverter VRF Units Service Manual Vulnerable part Name Material code Plate-type Heat Exchanger 010007060007 Strainer 07222025 Cover Plate 012035000246P Left Front Panel 012062000017P right panel 012167000014P Left Front Panel 012062000016P Electronic Expansion Valve 072009060012 Cut off Valve 0733410005301 Nozzle for Adding Freon 06130002...
Page 280 Gree GMV6 DC Inverter VRF Units Service Manual 6.3 Explosive View and Parts List of GMV-504WM/H-X, GMV-560WM/H-X and GMV-615WM/H-X Name Code Vulnerable part * Rear Grill 016001060013 Coping 012049000059P Diversion Circle 200150000011 Axial Flow Fan 10434100002 Brushless DC Motor 1570412405 Cover Plate 012035000247P Rear Grill...
Page 281 Gree GMV6 DC Inverter VRF Units Service Manual Name Code Vulnerable part * Oil Separator 035028060002 Electronic Expansion Valve 072009060012 Cut off Valve 0733410005301 Electric Expand Valve Fitting 072002000011 Cut off Valve 0733410001401 One Way Valve 07333700032 Pressure Protect Switch 4602000911 Pressure Protect Switch 4602000910...
Page 282: 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) (kΩ) (kΩ)
Page 283 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (kΩ) (kΩ) (°C) (°C) 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 1.577 0.678...
Page 284 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (kΩ) (kΩ) (°C) (°C) 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 2.796 0.222...
Page 285 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (kΩ) (kΩ) (°C) (°C) 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 0.998 1.233...
Page 286 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (kΩ) (kΩ) (°C) (°C) 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 2.477 0.3808...
Page 287 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (kΩ) (kΩ) (°C) (°C) 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 0.158 4.9044...
Page 288 Gree GMV6 DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (kΩ) (kΩ) (°C) (°C) 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 0.94 1.4141...
Page 289: 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 1.68 6.37...
Page 290: 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 0.13...
Page 291 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 4190...
Page 292 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 1453 3.203...
Page 293: 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 supply or disconnection. Please refer to the following table for outdoor unit power cord specifications and circuit breakers Capacity of Minimum circuit breaker...
Page 294 Gree GMV6 DC Inverter VRF Units Service Manual Capacity of Minimum circuit breaker Recommended wire Combination cross-sectional Model Power supply of each (cross-sectional area) method area of grounding combination wire (mm module (A) 380-415V 3N~ 560+615 50+50 10.0+10.0 10.0×5+10.0×5 GMV-1175WM/H-X 50/60Hz 380-415V 3N~ 615+615...
Page 295 Gree GMV6 DC Inverter VRF Units Service Manual ② Specification of power cord is based on the working condition where ambient temperature is 40°C. and multi-core copper cable (working temperature is 90°C.) is lying on the surface of slot (IEC 60245). If working condition changes, please adjust the specification according to standard IEC 60245.
Page 296: Appendix 5 Circuit Diagram
Gree GMV6 DC Inverter VRF Units Service Manual Appendix 5 Circuit Diagram GMV-224WM/H-X、GMV-280WM/H-X and GMV-335WM/H-X...
Page 297 Gree GMV6 DC Inverter VRF Units Service Manual GMV-400WM/H-X、GMV-450WM/H-X...
Page 298 Gree GMV6 DC Inverter VRF Units Service Manual GMV-504WM/H-X、GMV-560WM/H-X and GMV-615WM/H-X Note: Refer to the mark on the unit for the actual circuit diagram.
Page 299: 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 300 Gree GMV6 DC Inverter VRF Units Service Manual System principle diagram of GMV-400WM/H-X、GMV-450WM/H-X...
Page 301 Gree GMV6 DC Inverter VRF Units Service Manual System principle diagram of GMV-504WM/H-X、GMV-560WM/H-X and GMV-615WM/H-X...
Page 302: 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 303 JF00304228...

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Gmv-224wm/h-x Gmv-280wm/h-x Gmv-335wm/h-x Gmv-400wm/h-x Gmv-450wm/h-x Gmv-504wm/h-x ... Show all

Asami AMV6 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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