Gree Ultra Heat GMV Multi VRF Heat Pump Series User manual

Ultra Heat GMV Multi VRF
TECHNICAL SERVICE MANUAL (R410A)
——Heat Pump Series

I
CONTENTS
CONTENTS................................................................................................................................................................ I
PREFACE.................................................................................................................................................................. 1
CHAPTER 1 INTRODUCTION TO BASIC FEATURES OF UNITS................................................................. 7
1 BASIC OPERATING PRINCIPLE............................................................................................................... 7
2 INTERNAL PIPING DESIGN OF THE UNITS.......................................................................................... 8
2.1 Piping Diagram of GMV-V72W/A-F(U) 、GMV-V96W/A-F(U)................................................. 8
2.2 Names and main functions of components .............................................................................. 8
3 BASIC PARAMETERS OF ODU.............................................................................................................. 10
4 ELECTRICAL PARAMETERS.................................................................................................................. 11
4.1 Power Cable Wire Gauge and Circuit Breaker Selection of ODU...................................... 11
4.2 Circuit Diagram of ODU................................................................................................................ 11
5 OPTIONAL ACCESSORIES ..................................................................................................................... 12
6 BASIC REQUIREMENT FOR PIPE CONNECTION ............................................................................. 13
7 PRECAUTIONS ON REFRIGERANT LEAKAGE ................................................................................. 14
8 UNIT OPERATING TEMPERATURE....................................................................................................... 16
CHAPTER 2 INSTALLATION............................................................................................................................... 18
PART 1 ENGINEERING INSTALLATION PREPARATION..................................................................... 18
1 INSTALLATION SAFETY .......................................................................................................................... 18
2 IMPORTANCE OF INSTALLATION ENGINEERING............................................................................ 18
3 COOPERATION BETWEEN DIFFERENT PROFESSIONS................................................................ 19
3.1 Requirements for Cooperation with Civil Engineering ........................................................ 19
3.2 Requirements for Cooperation with Decoration Engineering............................................ 20
3.3 Requirements for Cooperation with Electric........................................................................... 20
4 ONSITE REVIEW OF DESIGN DRAWING............................................................................................. 22
5 CONSTRUCTION ORGANIZATION PROCESS.................................................................................... 23
PART 2 MATERIAL SELECTIONS ............................................................................................................. 24
1 REQUIREMENT FOR SELECTING CONSTRUCTION MATERIALS................................................ 24
2 REQUIREMENT FOR SELECTING MAJOR MATERIALS.................................................................. 24
2.1 Copper Pipe..................................................................................................................................... 24
2.2 Communication Cable and Control Cable............................................................................... 24
2.3 Power Cable..................................................................................................................................... 25
2.4 Other Requirements ...................................................................................................................... 25
PART 3 INSTALLATION SPACE REQUIREMENTS................................................................................ 26
1 PLACE SELECTION FOR INSTALLING ODU ...................................................................................... 26
2 ODU DIMENSIONS AND INSTALLATION HOLE SIZE....................................................................... 26
3 INSTALLATION SPACE REQUIREMENT FOR ODU........................................................................... 26
PART 4 REQUIREMENTS ON FOUNDATION INSTALLATION............................................................ 33
1 ODU FOUNDATION.................................................................................................................................... 33
2 ODU FIXING................................................................................................................................................. 34
3 VIBRATION REDUCTIONS FOR ODU ................................................................................................... 34
PART 5 PIPING CONNECTION................................................................................................................... 35
1 SCHEMATIC DIAGRAM OF PIPING CONNECTION........................................................................... 35
2 SCHEMATIC DIAGRAM OF PIPING SEQUENCE................................................................................ 35
3 ALLOWABLE PIPE LENGTH AND DROP HEIGHT AMONG IDU AND ODU................................. 35
4 FITTING PIPE BETWEEN ODU AND THE FIRST MANIFOLD.......................................................... 37
PART 6 PIPE INSTALLATION AND INSULATION................................................................................... 40
1 PIPE INSTALLATION FOR THE COOLING SYSTEM ......................................................................... 40
1.1 Precautions on Pipe Direction Design...................................................................................... 40
1.2 Processing to Refrigerant Pipes................................................................................................ 41
1.3 Installation of Refrigerant Pipes................................................................................................. 42
2 PIPE INSTALLATIONS FOR THE CONDENSATE WATER SYSTEM............................................... 50

II
2.1 Pipes.................................................................................................................................................. 50
2.2 Requirements on Installation...................................................................................................... 50
2.3 Other Requirements ...................................................................................................................... 51
2.4 Requirements on Installation of Drain Pipes for Different Types of IDUs....................... 52
2.5 Requirements on Independent Drainage for Each IDU........................................................ 53
2.6 Requirements on Centralized Drainage for IDUs................................................................... 53
3 INSULATION SYSTEM.............................................................................................................................. 53
3.1 Insulation for the Refrigerant Pipe System............................................................................. 53
3.2 Insulation for the Condensate Water Pipe System................................................................ 54
3.3 Insulation for Air Ducts................................................................................................................. 54
PART 7 ELECTRIC AND CONTROLLER INSTALLATION .................................................................... 56
1 PRECAUTION ............................................................................................................................................. 56
2 INSTALLATION OF THE POWER CABLE............................................................................................. 57
2.1 Precautions...................................................................................................................................... 57
2.2 Requirements on Power Cable Configuration........................................................................ 57
2.3 Procedure for Installing the Power Cable................................................................................ 58
3 INSTALLATION OF THE COMMUNICATION SYSTEM....................................................................... 60
3.1 Connection of Communication Cable Terminals................................................................... 61
3.2 Connection of Communication Cables .................................................................................... 61
3.3 Communication Cable Connection Method and Procedure............................................... 61
PART 8 VACUUMIZATION AND DESICCATION FOR THE REFRIGERANT SYSTEM.................... 65
1 AIR-TIGHTNESS TEST.............................................................................................................................. 65
1.1 Importance of the Air-tightness Test......................................................................................... 65
1.2 Procedure for Performing the Air-tightness Test................................................................... 65
1.3 Precautions...................................................................................................................................... 65
2 VACUUMIZATION AND DESICCATION FOR THE SYSTEM............................................................. 66
2.1 Requirements on the Vacuum Pump......................................................................................... 66
2.2 Procedure and Precautions for Vacuumization and Desiccation...................................... 66
PART 9 REFRIGERANT PERFUSION....................................................................................................... 68
1 CALCULATION METHOD FOR PERFUSING REFRIGERANT ......................................................... 68
2 METHOD FOR PERFUSING REFRIGERANT....................................................................................... 69
2.1 Refrigerant Pre-perfusion............................................................................................................ 69
2.2 Refrigerant Perfusion During Running..................................................................................... 70
CHAPTER 3 COMMISSIONING OPERATION.................................................................................................. 73
PART 1 SECURITY REQUIREMENTS....................................................................................................... 73
1 PRECAUTIONS FOR CONSTRUCTION................................................................................................ 73
2 PRECAUTIONS FOR THE USE OF REFRIGERANTS........................................................................ 73
3 FUNCTION SETTINGS OF ODUS........................................................................................................... 73
3.1 System Function DIP Switch Settings...................................................................................... 74
3.2 System Function Button Operations ........................................................................................ 77
3.3 Function Setting Operations....................................................................................................... 79
3.4 Basic Operations for Engineering Commissioning.............................................................. 81
PART 2 COMMISSIONING PROCESS ...................................................................................................... 83
1 NECESSITY OF VRF ENGINEERING COMMISSIONING .................................................................. 83
2 REQUIRED FILES AND TOOLS FOR ENGINEERING DEBUGGING.............................................. 83
2.1 Required Tools for Engineering Commissioning .................................................................. 83
2.2 Commissioning Files .................................................................................................................... 83
3 ENGINEERING COMMISSIONING PROCEDURES............................................................................. 84
3.1 Pre-commissioning Preparations.............................................................................................. 84
3.2 Pre-commissioning Check........................................................................................................... 84
3.3 Commissioning Operation........................................................................................................... 88
CHAPTER 4 MAINTENANCE............................................................................................................................ 101
PART 1 FAILURE CODE TABLE .............................................................................................................. 101
1 SYSTEM FAILURE CODE TABLE......................................................................................................... 101

III
2 ODU LEDS TABLE................................................................................................................................... 104
PART 2 EXCEPTIONS AND TROUBLESHOOTING ............................................................................. 107
1 HOW TO LOCATE A FAULTY IDU PROMPTLY.................................................................................. 107
2 EXCEPTIONS ANALYZING AND TROUBLESHOOTING................................................................. 108
2.1 Form Analyzing............................................................................................................................. 108
2.2 Flowchart Analyzing.................................................................................................................... 110
PART 3 KEY PARTS MAINTENANCE..................................................................................................... 123
1 CAUTIONS ON CONTROLLER REPLACEMENT.............................................................................. 123
1.1 Cautions on IDU AP1 Replacement......................................................................................... 123
1.2 Cautions on Wired Control Replacement.............................................................................. 125
2 COMPRESSOR REPLACEMENT AND CAUTIONS.......................................................................... 126
2.1 Determining Compressor Fault................................................................................................ 126
2.2 Compressor Replacement......................................................................................................... 130
3 CAUTIONS ON COMPRESSOR DRIVE BOARD AND PFC BOARD REPLACEMENT ............. 140
4 ASSEMBLING AND DISASSEMBLING KEY PARTS OF ODUS..................................................... 145
5 UNIT MAINTENANCE.............................................................................................................................. 157
5.1 ODU Heat Exchanger .................................................................................................................. 157
5.2 Discharge Pipe.............................................................................................................................. 157
5.3 Pre-Season Cautions .................................................................................................................. 157
5.4 Post-Season Maintenance......................................................................................................... 157
5.5 Parts Replacement....................................................................................................................... 157
PART 4 APPENDIXES................................................................................................................................. 158
1 MINUTES ABOUT A DEBUG SOLUTION CONFIRMATION MEETING......................................... 158
2 VISUAL INSPECTION CHECKLIST OF THE DEBUG SYSTEM..................................................... 158
3 DEBUG PARAMETER RECORD LIST ................................................................................................. 159
4 COMMON PARAMETER LISTS............................................................................................................. 160
4.1 R410A Refrigerant Pressure / Saturation Temperature List.............................................. 160
4.2 Resistance / Temperature Lists of Temperature Sensors.................................................. 161
4.3 Voltage / Pressure Lists of Pressure Sensors...................................................................... 167
5 EXPLODED VIEWS AND SPARE PART LIST..................................................................................... 171
5.1 Exploded View of GMV-V72W/A-F(U)、GMV-V96W/A-F(U)................................................ 171
5.2 Spare Part List of GMV-V72W/A-F(U)、GMV-V96W/A-F(U)................................................ 171
CHAPTER 5 REMOTE CONTROL.................................................................................................................... 176
PART 1 ENGINEERING DEBUGGER...................................................................................................... 176
1 OVERVIEW ................................................................................................................................................ 176
2 SYSTEM NETWORKING......................................................................................................................... 176
2.1 Composition of System Network............................................................................................. 176
3 HARDWARE .............................................................................................................................................. 177
3.1 List of Parts.................................................................................................................................... 177
3.2 USB Data Converter..................................................................................................................... 177
3.3 COM Interface Board................................................................................................................... 179
3.4 Lines................................................................................................................................................ 179
4 SOFTWARE SETUP AND UNINSTALL................................................................................................ 179
4.1 Prerequisites................................................................................................................................. 179
4.2 Installation Procedure................................................................................................................. 179
4.3 Software Startup and Shut Down............................................................................................. 183
4.4 Uninstall VRF Debugging Software......................................................................................... 184
5 USING DEBUGGER................................................................................................................................. 186
5.1 Manual for Initial Usage.............................................................................................................. 186
5.2 User Log In and Registration.................................................................................................... 187
5.3 Main Interface................................................................................................................................ 188
5.4 Debugging Function.................................................................................................................... 189
5.5 Data Function................................................................................................................................ 198
PART 2 VRF MONITORING SYSTEM...................................................................................................... 200

IV
1 OVERVIEW ................................................................................................................................................ 200
1.1 Major Functions............................................................................................................................ 200
1.2 Network Topology........................................................................................................................ 200
2 HARDWARE .............................................................................................................................................. 204
2.1 List of Parts.................................................................................................................................... 204
2.2 Gateway.......................................................................................................................................... 204
2.3 Introduction of Optoelectronic Isolated Repeater............................................................... 211
3 SOFTWARE............................................................................................................................................... 213
3.1 List of Parts.................................................................................................................................... 213
3.2 Preliminary Check........................................................................................................................ 213
3.3 Software Setup and Uninstallation.......................................................................................... 214
3.4 Software Initial Usage and Unit Connection......................................................................... 220
4 VRF MONITORING SYSTEM DEBUG.................................................................................................. 223
4.1 Air Conditioner System Debug................................................................................................. 223
4.2 Communication Debug between Gateways and Air Conditioning Units....................... 223
4.3 Communication Debug between Gateways and Electric Meters..................................... 224
4.4 Communication Debug between Gateways and Gree VRF Monitoring System.......... 226
5 TROUBLESHOOTING............................................................................................................................. 230
5.1 Hardware Faults............................................................................................................................ 230
5.2 Software Faults............................................................................................................................. 230

Ultra Heat GMV VRF Technical Service Manual PREFACE AND SAFTY PRECAUTIONS
1
PREFACE
This manual specifies safe operation requirements for Ultra Heat GMV VRF units from perspectives
of engineering and installation, commissioning and maintenance, as well as basic principles and
implementation methods. Professional operators must abide by relevant national (local) safety
requirements and technical specifications set forth in this manual during operations; otherwise, the air
conditioning system may fail or be damaged, and personnel safety accident may also occur.
SAFTY PRECAUTIONS
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible injury or death.
WARNING
This mark indicates procedures which, if improperly performed, might lead to the death or serious injury of
the user.
CAUTION
This mark indicates procedures which, if improperly performed, might possibly result in personal harm to
the user, or damage to property.
NOTICE is used to address practices not related to personal injury.

Ultra Heat GMV VRF Technical Service Manual PREFACE AND SAFTY PRECAUTIONS
2
Installation
Have all electric work done by a licensed electrician according to "Electric Facility Engineering
Standard" and "Interior Wire Regulations" and the instructions given in this manual and always
use a special circuit.
If the power source capacity is inadequate or electric work is performed improperly, electric shock or fire
may result.
Ask the dealer or an authorized technician to install the air conditioner.
Improper installation by the user may result in water leakage, electric shock, or fire.
Always ground the product.
There is risk of fire or electric shock.
Always install a dedicated circuit and breaker.
Improper wiring or installation may cause fire or electric shock.
For re-installation of the installed product, always contact a dealer or an Authorized Service
Center.
There is risk of fire, electric shock, explosion, or injury.
Do not install, remove, or re-install the unit by yourself (customer).
There is risk of fire, electric shock, explosion, or injury.
Do not store or use flammable gas or combustibles near the air conditioner.
There is risk of fire or failure of product.
Use the correctly rated breaker or fuse.
There is risk of fire or electric shock.
Prepare for strong wind or earthquake and install the unit at the specified place.
Improper installation may cause the unit to topple and result in injury.
Do not install the product on a defective installation stand.
It may cause injury, accident, or damage to the product.
When installing and moving the air conditioner to another site, do not charge it with a different
refrigerant from the refrigerant specified on the unit.
If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction
and the unit may be damaged.
Do not reconstruct to change the settings of the protection devices.
If the pressure switch, thermal switch, or other protection device is shorted and operated forcibly, or
parts other than those specified by GREE are used, fire or explosion may result.
Ventilate before operating air conditioner when gas leaked out.
It may cause explosion, fire, and burn.
Securely install the cover of control box and the panel.
If the cover and panel are not installed securely, dust or water may enter the outdoor unit and fire or
electric shock may result.

Ultra Heat GMV VRF Technical Service Manual PREFACE AND SAFTY PRECAUTIONS
3
If the air conditioner is installed in a small room, measures must be taken to prevent the
refrigerant concentration from exceeding the safety limit when the refrigerant leaks.
Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceeded.
Should the refrigerant leak and cause the safety limit to be exceeded, hazards due to lack of oxygen in
the room could result.
Operation
Do not damage or use an unspecified power cord.
There is risk of fire, electric shock, explosion, or injury.
Use a dedicated outlet for this appliance.
There is risk of fire or electrical shock.
Be cautious that water could not enter the product.
There is risk of fire, electric shock, or product damage.
Do not touch the power switch with wet hands.
There is risk of fire, electric shock, explosion, or injury.
When the product is soaked (flooded or submerged), contact an Authorized Service Center.
There is risk of fire or electric shock.
Be cautious not to touch the sharp edges when installing.
It may cause injury.
Take care to ensure that nobody could step on or fall onto the outdoor unit.
This could result in personal injury and product damage.
Do not open the inlet grille of the product uring operation. (Do not touch the electrostatic filter, if
the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.

Ultra Heat GMV VRF Technical Service Manual PREFACE AND SAFTY PRECAUTIONS
4
Installation
Always check for gas (refrigerant) leakage after installation or repair of product.
Low refrigerant levels may cause failure of product.
Do not install the product where the noise or hot air from the outdoor unit could damage the
neighborhoods.
It may cause a problem for your neighbors.
Keep level even when installing the product.
To avoid vibration or water leakage.
Do not install the unit where combustible gas may leak.
If the gas leaks and accumulates around the unit, an explosion may result.
Use power cables of sufficient current carrying capacity and rating.
Cables that are too small may leak, generate heat, and cause a fire.
Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a
consumer air conditioner, not a precision refrigeration system.
There is risk of damage or loss of property.
Keep the unit away from children. The heat exchanger is very sharp.
It can cause the injury, such as cutting the finger. Also the damaged fin may result in degradation of
capacity.
When installing the unit in a hospital, communication station, or similar place, provide sufficient
protection against noise.
The inverter equipment, private power generator, high-frequency medical equipment, or radio
communication equipment may cause the air conditioner to operate erroneously, or fail to operate. On
the other hand, the air conditioner may affect such equipment by creating noise that disturbs medical
treatment or image broadcasting.
Do not install the product where it is exposed to sea wind (salt spray) directly.
It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins,
could cause product malfunction or inefficient operation.
Operation
Do not use the air conditioner in special environments.
Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of the air conditioner or damage
its parts.
Do not block the inlet or outlet.
It may cause failure of appliance or accident.
Make the connections securely so that the outside force of the cable may not be applied to the
terminals.

Ultra Heat GMV VRF Technical Service Manual PREFACE AND SAFTY PRECAUTIONS
5
Inadequate connection and fastening may generate heat and cause a fire.
Be sure the installation area does not deteriorate with age.
If the base collapses, the air conditioner could fall with it, causing property damage, product failure, or
personal injury.
Install and insulate the drain hose to ensure that water is drained away properly based on the
installation manual.
A bad connection may cause water leakage.
Safely dispose of the packing materials.

Tear apart and throw away plastic packaging bags so that children may not play with them. If children
play with a plastic bag which was not torn apart, they face the risk of suffocation.
Turn on the power at least 8 hours before starting operation.
Starting operation immediately after turning on the main power switch can result in severe damage to
internal parts. Keep the power switch turned on during the operational season.
Be very careful about product transportation.
Only one person should not carry the product if it weighs more than 44lbs (20kg).
Some products use PP bands for packaging. Do not use any PP bands for a means of transportation. It
is dangerous.
Do not touch the heat exchanger fins. Doing so may cut your fingers.
When transporting the outdoor unit, suspend it at the specified positions on the unit base. Also support
the outdoor unit at four points so that it cannot slip sideways.
Do not touch any of the refrigerant piping during and after operation.
It can cause a burn or frostbite.
Do not operate the air conditioner with the panels or guards removed.
Rotating, hot, or high-voltage parts can cause injuries.
Do not directly turn off the main power switch after stopping operation.
Wait at least 5 minutes before turning off the main power switch. Otherwise it may result in water
leakage or other problems.
Auto-addressing should be done in condition of connecting the power of all indoor and outdoor
units. Auto-addressing should also be done in case of changing the indoor unit PCB. Use a firm
stool or ladder when cleaning or maintaining the air conditioner.
Be careful and avoid personal injury.
Do not insert hands or other objects through the air inlet or outlet while the air conditioner is
plugged in.
There are sharp and moving parts that could cause personal injury.

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
6
CHAPTER 1
INTRODUCTION TO
BASIC FEATURES
OF UNITS

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
7
CHAPTER 1 INTRODUCTION TO BASIC FEATURES OF UNITS
1 BASIC OPERATING PRINCIPLE
The operating principle is as follows: When an indoor unit (IDU) is operating in cooling mode, the
outdoor unit (ODU) can correspondingly enable the outdoor module based on the operating load
requirement of the IDU. The outdoor heat exchanger serves as a system condenser, and the heat
exchangers of cooling IDUs are connected in parallel to serve as a system evaporator. The circulation of
air supply and air return of the IDU is performed to adjust the indoor temperature and humidity. When an
IDU is operating in heating mode, all four-way valves in the ODU module are switched into energized
status. The outdoor heat exchange serves as the system evaporator, and the heat exchanger of the IDU
serves as the system condenser. The circulation of air supply and air return of the IDU is performed to
adjust the indoor temperature and humidity.
MODELS LIST:
Model Name
Product Code
Power Supply
(V, Ph, Hz)
Appearance
GMV-V72W/A-F(U)
CN851W2250
208/230V 3ph 60Hz
GMV-V96W/A-F(U)
CN851W2260
208/230V 3ph 60Hz

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
8
2 INTERNAL PIPING DESIGN OF THE UNITS
2.1 Piping Diagram of GMV-V72W/A-F(U) 、GMV-V96W/A-F(U)
2.2 Names and main functions of components
No.
Name
Main Function
1
Compressor
Adjusts its own rotational speed based on the actual requirement of the
system to implement capacity control.
2
Compressor heat tape
Maintains a proper oil temperature in the compressor when the compressor
is in standby status, ensuring the reliability during compressor startup.
3
Exhaust pipe temperature sensor of
compressor
Detects a compressor's exhaust gas temperature for compressor control
and protection.
4
High-pressure circuit breaker
Protects a compressor by sending feedback signal to stop the system when
the compressor's discharge pressure exceeds the operating value of
high-pressure circuit breaker.
5
Oil extractor
Separates the gas and oil in the system to ensure compressor reliability.
6
One-way valve
Prevents high-pressure gas from entering the compressor and fast balances
the suction pressure and discharge pressure in a compressor.
7
High-pressure sensor
Detects the high pressure value in the system in real time mode for
compressor protection and other control functions.
8
Four-way valve 1
Used for the switching between the cooling and heating functions of system
IDU.

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
9
9
Heat exchanger
Used for outdoor heat exchange.
10
Fan
Strengthens heat exchanging.
11
Defrosting temperature sensor
Used for defrosting detection.
12
Electronic expansion valve for
heating
Controls refrigerant adjustment in heating mode.
13
One-way valve
Controls refrigerant flow direction.
14
Unloading valve
Opening if the pressure inside the liquid pipe /gas pipe is too high.
15
Sub cooler electronic expansion
valve
Reduces the pressure and temperature of ramous refrigerant to cool the
main branch refrigerant.
16
Sub cooler
Controls the degree of sub cooling of tube.
17
Liquid outlet temperature sensor of
sub cooler
Detects tube temperature.
18
Middle-pressure sensor
Detects system middle pressure.
19
Gas outlet temperature sensor of
sub cooler
Detects gas temperature of sub cooler.
20
Compensate vapor valve
Used for compensating vapor for second compression.
21
Sub-cooling valve
Used for providing with sub-cooling liquid.
22
Low-pressure sensor
Detects system low pressure to avoid extra-low operating pressure.
23
Gas-liquid separator
Separate gas and liquid to prevent the system from running when the
refrigerant flows back to the compressor.
24
Outlet temperature sensor of
gas-liquid separator
Detects internal status of gas-liquid separator to further control the
compressor suction performance.
25
Oil return valve 1
Oil return control for the compressor.
26
Inlet temperature sensor of
gas-liquid separator
Detects inlet temperature of gas-liquid separator.
27
Fusible plug
Opening if the pressure or the temperature inside the accumulator or
liquid-gas separator is too high
28
One-way valve
Controls refrigerant flow direction.
29
One-way valve
Controls refrigerant flow direction.
30
Filter
Prevents impurities from entering components and parts.
31
Capillary tube
Supports flow regulating and pressure reduction.
32
Oil return valve
Oil return control for the compressor.
33
Pressure-balanced valve
Ensures success startup of compressor.
34
Varying capacity valve 1
To make the compressor turn with double cylinders.
35
Varying capacity valve 2
To make the compressor turn with triple cylinders.
36
Oil-balanced valve 1
Make sure oil of the system is balanced.
37
Oil-balanced valve 2
Make sure oil of the modules is balanced.
38
Gas-bypass valve
Make sure pressure of the system is balanced.
39
One-way valve
Prevents high-pressure gas from entering the compressor and fast balances
the suction pressure and discharge pressure in a compressor.
40
Oil orifice
To charge compressor oil.
41
Gas pipe valve
Stop valve, closed when the unit is delivered from the factory and will be
opened after installation.
42
Low-pressure measurement valve
Detects the low pressure value or charges refrigerant during system
running.
43
Liquid pipe valve
Stop valve, closed when the unit is delivered from the factory and will be
opened after installation.

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
10
3 BASIC PARAMETERS OF ODU
Outdoor Units_Heat Recovery
Ton
6
8
Model
-
GMV-V72W/A-F(U)
GMV-V96W/A-F(U)
Performance
Nominal Cooling
Capacity
Btu/h
72000
96000
kW
21.1
28.1
Nominal Heating
Capacity
Btu/h
81000
108000
kW
23.7
31.6
Cooling Power Input
kW
5.54
7.87
Heating Power Input
kW
6.09
8.33
Sound Pressure Level
dB(A)
60
60
Power Supply
-
208/230V 3~ 60HZ
Compressor
Type
-
Inverter Rotary
Inverter Rotary
Number
N
2
2
Motor Output
kW
5.83
5.83
Starting Method
-
Inverter
Inverter
Operating Range
-
10%~100%
10%~100%
Refrigeration Oil
Brand
-
FV50S
FV50S
Oil Charge
L
1.35
1.35
Fan
Type×Quantity
-
Propeller×2
Propeller×2
Motor Output
W
750+750
750+750
Starting Method
-
Inverter
Inverter
Air Flow Rate
m3/h
14000
14000
cfm
8240
8240
Max. External Static
Pressure
Pa
82
82
in.W.G
0.328
0.328
Ambient Temperature
Range
Cooling
℃
-10~52
-10~52
℉
14~125.6
14~125.6
Heating
℃
-30~24
-30~24
℉
-22~75.2
-22~75.2
Refrigerant
Type
-
R410A
R410A
Charge Volume
kg
11
11
lbs.
24.3
24.3
Control
-
EEV
EEV
Pipe Connection
Gas Pipe
mm
28.6
28.6
in.
1-1/8
1-1/8
Liquid Pipe
mm
9.52
9.52
in.
3/8
3/8
Dimensions
(width×depth×height)
External Dimension
mm
1340×765×1605
1340×765×1605
in.
52-3/4×30-1/8×63-1/5
52-3/4×30-1/8×63-1/5

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
11
Packaging Dimension
mm
1420×840×1775
1420×840×1775
in.
56×33×69-7/8
56×33×69-7/8
Weight
Net Weight
kg
375
375
lbs.
827
827
Gross Weight
kg
391
391
lbs.
862
862
Maximum Quantity of Connected Indoor Unit
unit
12
17
Protection Devices
High Pressure
Protection
-
High pressure sensor, high pressure switch
Compressor/Fan
-
Over-current protection, over-heat protection
Inverter
-
Over-current protection
Remark
1. Rating conditions:
Cooling: Indoor 26.7℃(80.1℉)DB/19.4℃(66.9℉)WB, Outdoor 35℃(95℉)DB/23.9℃(75℉)WB
Heating: Indoor 21.1℃(70℉)DB/15℃(59℉)WB, Outdoor 8.3℃(46.9℉)DB/6.1℃(43℉)WB
2. It refers to the operation power of compressor under ARI test conditions (condensing temp.130
℉, evaporating temp.45℉, return gas temp.65℉, liquid temp.115℉) at 60HZ.
3. Oil charge includes the total oil amount of outdoor units, residual oil amount of compressor and
oil separate tank. When replacing the compressor or oil separate tank, only the corresponding
required oil amount shall be charged.
4 ELECTRICAL PARAMETERS
4.1 Power Cable Wire Gauge and Circuit Breaker Selection of ODU
Outdoor units
Power Supply
Fuse Capacity
MCA
MOP
V/ Ph /Hz
A
A
A
GMV-V72W/A-F(U)
208V/230V 3~ 60Hz
50
40
50
GMV-V96W/A-F(U)
208V/230V 3~ 60Hz
60
45
60
Note: MCA: Minimum Circuit Ampacity; MOP: Maximum Overcurrent Protection.
Power cable wire gauge and circuit breaker must be selected based on the above parameters and in
compliance with local safety requirements. If there is conflict between above parameters and national
requirements, please contact the manufacture promptly.
If power cable wire gauge and circuit breaker is out of the above design range, fire hazard may occur.
4.2 Circuit Diagram of ODU
The actual wiring should always refer to the wiring diagram of the unit.

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
12
When conducting maintenance based on above circuit diagrams, units must be power-off. Please strictly
following the circuit diagrams when reconnecting the wires, otherwise, electric shock may occur.
5 OPTIONAL ACCESSORIES
Ultra Heat GMV series VRF units support the following optional accessories:
Export Model
Remark
Manifold
ODU
ML01R
For model selection, refer to Pipe
Selection.
IDU
FQ01A/A
Remote-control Receiver Board
JS05
Applicable for air-duct-type IDUs.
Commissioning Remote Controller
YV1L1
Provides the commissioning functions
for function settings of IDUs.
Debugging Software
VRF Debugging Software.exe
Applicable to Ultra Heat GMV unit
Remote
Monitoring
System
Software
VRF Monitoring System.exe
Applicable to Ultra Heat GMV unit
Gateway
FE22-41/BEF(MCB)
Optoelectronic
Isolated Repeater
RS485-W

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
13
NOTICE! Contact local sales company for optional accessories.
6 BASIC REQUIREMENT FOR PIPE CONNECTION
1. Outdoor units adopt the modular combination design of individual cooling system, that is, units
are connected by using pipes in parallel during installation. The tubing system used among modules
includes liquid pipes and gas pipes.
Functions of oil check valve: During after-sale maintenance, the oil check valve can be used to extract
lubricating oil samples, which are further detected to analyze the oil quality in the system. The oil check
valve can also serve as the inlet for lubricating oil charging. Before extracting lubricating oil from the
system, stop the system for at least 12 hours and release ref
pressure drops to 0.05MPa (7.25psi) or below; otherwise, overheat oil may burn the operator.
Functions of low-pressure check valve: It is mainly used for low pressure detection of the system and
refrigerant charging during after-sale maintenance.
Pipe connection diagram of outdoor module:

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
14
2. Each ODU system can be connected to multiple IDUs. Detailed information about the number of
units to be connected and capacity ranges is shown in the following table:
Model
Maximum Number of
Connected IDUs (units)
Capacity Range of Connected IDU (kBtu/h)
Minimum Capacity
Maximum Capacity
GMV-V72W/A-F(U)
12
36.0
97.2
GMV-V96W/A-F(U)
17
48.0
129.6
During installation, please strictly follow the above capacity range and number to construct, otherwise,
units may work abnormally and compressors may even be damaged
7 PRECAUTIONS ON REFRIGERANT LEAKAGE
Personnel related to air conditioning engineering design and installation operators must abide by the
safety requirement for preventing refrigerant leakage specified in local laws and regulations. If such
safety requirement is unavailable in local documents, the design and operation must be implemented
based on the following principles: Ultra Heat GMV series VRF units adopt the R410A refrigerant, which
is nonflammable and nontoxic. However, the space for refrigerant leakage must be sufficient to ensure
that the refrigerant concentration does not exceed that specified in the safety requirement; otherwise,
people involved can be stifled by the refrigerant.
The maximum refrigerant charge and maximum refrigerant concentration in the system are
calculated directly based on the size of the air conditioning space. The unit of refrigerant concentration is
1 kg/m³or 1lb/m³.

Ultra Heat GMV VRF Technical Service Manual UNIT INTRODUCTION
15
(1) Flow direction of refrigerant leakage.
(2) Room for refrigerant leakage. Since the concentration of refrigerant is greater than that of air,
pay attention to the spaces where the refrigerant may residue, for example, the basement.
Method for calculating the maximum concentration of refrigerant:
(1) Calculate the refrigerant charge quantity of each system.
Charge quantity of an ODU upon delivery (for the system consisting of multiple modules in parallel,
the accumulative charge quantity of modules upon delivery is used) + Onsite charge quantity = Total
refrigerant charge quantity in the system (kg)
(2) Calculate the volume of maximum air conditioning space (m³).
Volume of air conditioning space (m³) = Length x Width x Height
Note: The length, width and height here refer to the effective length, width and height of the indoor
space.
(3) Calculate the maximum refrigerant concentration of the refrigeration system.
Note: If the maximum supported refrigerant concentration is not available in relevant local standard,
use 0.3kg /m³(0.66lbs/m³) as the maximum supported refrigerant concentration.
(4) If the maximum refrigerant concentration exceeds the allowed threshold, the refrigeration
system must be redesigned. In this case, separate the refrigeration system into multiple small-capacity
refrigeration systems, or contact local Gree sales company.