Gree GMV MTAC VRF Series User manual

GMV MTAC VRF for North America
(GC201908-I)
Capacity: 12kBtu/h
Rated Frequency: 60 Hz

CONTENTS
PRODUCT.................................................................................................................. 2
1 Product List............................................................................................................ 2
2 Product Features ................................................................................................... 2
2.1 General Introduction..................................................................................................... 2
3 Specifications ........................................................................................................ 3
3.1 Outdoor Unit................................................................................................................. 3
3.2 Operation Range.......................................................................................................... 4
4 Product Capacity Correction ................................................................................ 4
4.1 Instruction of Product Capacity Correction ................................................................... 4
4.2 Capacity Code ............................................................................................................. 4
4.3 Capacity Correction Formula........................................................................................ 4
5 Principal of Operation ........................................................................................... 6
CONTROL.................................................................................................................. 8
1 Units’ Control ......................................................................................................... 8
1.1 Schematic Diagram of Units’ Control............................................................................ 8
1.2 Operation Flow Chart ................................................................................................... 9
1.3 Unit Control Functions.................................................................................................10
2 Wired Controller ...................................................................................................11
2.1 Control Panel ..............................................................................................................11
2.2 Installation and Removal .............................................................................................14
3 Remote Controller ............................................................................................... 17
4 Monitoring Software ............................................................................................ 19
4.1 Function Introduction...................................................................................................19
4.2 Connection of Computer and Units .............................................................................19
4.3 Parts Introduction ........................................................................................................20
4.4 Software Introduction ..................................................................................................22
INSTALLATION........................................................................................................ 62
1 Engineering Installation Preparation and Notice .............................................. 62
1.1 Installation Notice........................................................................................................62
1.2 Installation Key Points and Importance........................................................................62
2 Installation Materials Selection .......................................................................... 63
2.1 Refrigerant Piping .......................................................................................................64
2.2 Condensate Water Pipe ..............................................................................................64
2.3 Insulation Material .......................................................................................................64
2.4 Communication Cable and Control Cable ...................................................................65
2.5 Power Cable ...............................................................................................................65

2.6 Hanger Rod and Support ............................................................................................65
3 Installation of Outdoor Unit ................................................................................ 65
3.1 Check before Installation.............................................................................................65
3.2 Selection of Installation Site ........................................................................................65
3.3 Carrying and Installing Outdoor Unit............................................................................66
3.4 Installation Notices ......................................................................................................66
3.5 Fixing and Damping of Unit .........................................................................................66
3.6 Outline Dimension and Position of Installation Hole ....................................................67
3.7 Installation Space Requirement...................................................................................67
4 Installation of Electronic Expansion Valve Assy (unit with external EXV)...... 68
5 Installation of Refrigerant Pipeline..................................................................... 68
5.1 Allowable Length and Height Difference of Connection Pipe .......................................68
5.2 Dimension of Pipe (Main Pipe) from ODU to the 1st Indoor Branch .............................69
5.3 Selection of Indoor Branches ......................................................................................69
5.4 Dimension of Pipe between Indoor Branches..............................................................70
5.5 Dimension of Pipe between Indoor Branch and IDU....................................................70
6 Installation of Connection Pipe .......................................................................... 71
6.1 Flaring Process ...........................................................................................................71
6.2 Vacuum Pumping, Refrigerant Adding.........................................................................75
7 Electric Wiring ..................................................................................................... 76
7.1 Wiring Diagram ...........................................................................................................77
7.2 Power Cable Wire Gauge and Circuit Breaker Selection.............................................78
8 Debugging of Unit ............................................................................................... 78
8.1 Preparation for Debugging ..........................................................................................78
8.2 Debugging of Unit .......................................................................................................79
8.3 Parameters Reference Value for the Normal Operation of Unit .......................................82
MAINTENANCE ....................................................................................................... 85
1 Malfunction List ................................................................................................... 85
1.1 Malfunction List for the Wired Controller......................................................................85
1.2 Status Display Table for Indicators on Main Board of Outdoor Unit..............................85
2 Troubleshooting .................................................................................................. 88
3 Power Distribution of Unit .................................................................................. 98
3.1 Power Distribution of Unit............................................................................................98
3.2 Main Electric Parts ......................................................................................................98
3.3 Circuit Diagram ...........................................................................................................99
4 Removal of Parts ................................................................................................. 99
4.1 Key Parts ....................................................................................................................99

4.2 Removal of Key Parts ...............................................................................................100
5 Common Maintenance ...................................................................................... 108
5.1 Vacuum Drying for the System ..................................................................................108
5.2 Fill and Charge Refrigerant .......................................................................................109
5.3 Airtightness Test........................................................................................................109
6 Exploded View of Unit and Parts’ List...............................................................111

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PRODUCT

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PRODUCT
1 Product List
Model Product
Code
Cooling
Capacity
Heating
Capacity
Power Supply Refrigerant Appearance
kW(Btu/h)
kW(Btu/h)
GMV-12WP/A-T(U) CN850W0930 3.52
(12000)
3.52
(12000)
208V/230V~
60Hz R410A
2 Product Features
2.1 General Introduction
GMV MTAC is a kind of concealed VRF unit, which adopts front side air discharge and air
return. It’s mainly developed for North American market, which is applicable for apartments, offices,
hotels and other areas. The unit adopts deep subcooling technology for ensuring the quiet cooling
operation. Moreover, the unique drainage control technology has solved the problem of water
drainage of outdoor unit under low-temperature environment. Include GMV-12WP/A-T(U).
2.1.1 Features
(1) Super high energy efficiency.
The system adopts all DC motor, which greatly improves efficiency. The energy efficiency for
Gree all DC unit is increased greatly. SEER of GMV-12WP/A-T(U) is up to 15.5; HSPF of
GMV-12WP/A-T(U) is up to 9.5.
(2) New generation CAN bus communication.
Due to the latest communication method—CAN Bus Communication, system’s
anti-interference capability is stronger and the control on indoor units is more accurate, with higher
reliability. Specialized shield wire is no more needed and ordinary communication wire can be
applied in the construction, which has increased the installation flexibility.
(3) Long connection pipe.
GMV-12WP/A-T(U):
The maximum length of connection pipe is 30m(98-3/8ft) (in total) and the farthest connection
pipe between indoor and outdoor units can be 30(98-3/8ft) m’s long, which has extended the
installation condition and reduced the limit of installation distance.
(4) Wide operation range.
Units can operate reliably in a wide temperature range (cooling: -5~48°C(23~118.4°F),
heating: -20~27°C(-4~80.6°F)).
(5) Fine sound quality.
Through a series of optimized measures, system has reduced the throttle noise and oil return
noise of indoor units, gas bypass noise, etc. so that units are more comfortable regarding sound
quality.

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(6) Intelligent PID capacity regulation.
With the independently developed PID capacity regulation technology, units are able to
control the indoor ambient temperature more quickly and reduce the fluctuation of room
temperature.
(7) Complete protection.
Units are equipped with a series of protection to accurately identify errors and protect the units,
which has ensured reliable and safe operation.
3 Specifications
3.1 Outdoor Unit
Model
GMV-12WP/A-T(U)
Cooling capacity
kW
3.52
Btu/h
12000
Heating capacity
kW
3.52
Btu/h
12000
Circulating air volume
m
3
/h
850
CFM
500
Noise
dB(A)
Indoor46/Outdoor57
Refrigerant charge volume
Kg
0.8
oz
28.2
Power supply
208V/230V~60Hz
Rated power input
Cooling
kW
1.4
Heating
kW
1.1
Unit Dimensions (W×D×H)
mm
1069×500×406
inch
42-1/16×19-11/16×16
Dimensions (W×D×H)
mm
1164×601×470
inch
45-13/16×23-11/16×18-8/16
Compressor
SNB150FGAMC
Water-proof level
IPX4
Suitable climate
T1
Connection pipe
Gas
mm
Φ12.7
inch
Φ1/2
Liquid
mm
Φ6.35
inch
Φ1/4
Connection Method
Flare Connection
Net weight
Kg
55
oz
121
NOTICE!
①Units conform to design standard: ARI 210/240.
②Specifications may be changed due to product improvement. Please refer to nameplates
of the units.
③Noise data are collected from a semi-anechoic room. Decibels may be slightly higher in
actual operation due to environmental change.
④Refrigerant charge volume listed in the table is based on the condition where indoor and

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outdoor units are at a same level and with no connection pipe. Supplementary refrigerant
needs to be charged according to actual circumstance.
3.2 Operation Range
Cooling
Outdoor temperature: -5~48°C (23~118.4°F)
Heating
Outdoor temperature: -20~27°C(-4~80.6°F)
4 Product Capacity Correction
4.1 Instruction of Product Capacity Correction
Nominal cooling capacity and nominal heating capacity are tested under given conditions:
(1) Rated cooling or heating condition.
(2) No height difference between indoor unit and outdoor unit.
(3) Short connection pipe.
If the three conditions above have changed, the cooling and heating capacity will change
correspondingly and correction is needed.
4.2 Capacity Code
Instruction of capacity code.
GMV-12WP/A-T(U) are identical in components, systems and structure, etc.. While the
required capacity is set through the capacity DIP switch.
Sheet of DIP Switch (5-bit DIP switch)
Model
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
GMV-12WP/A-T(U)
0
1
1
1
0
4.3 Capacity Correction Formula
4.3.1 Rated Capacity of Outdoor Unit
Model
GMV-12WP/A-T(U)
Rated cooling capacity
kW
3.52
Btu/h
12000
Rated heating capacity
kW
3.52
Btu/h
12000

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4.3.2 Correction Factor of Indoor and Outdoor Temperature
(1) Correction factor of cooling capacity.
(2) Correction factor of heating capacity.
4.3.3 Correction Factor of Pipe Length and Height Difference
Symbol description:
Hp: Height difference in case indoor unit is below outdoor unit(m/feet).
Hm: Height difference in case indoor unit is above outdoor unit (m/feet).
L: Length of one-way equivalent pipe.

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Below table shows the capacity variance ratio for 100% full load in standard working condition
(thermostat setting is 16°C(61°F ) for cooling and 30°C(86°F ) for heating).
50
40
30
20
Hp(m)
L(m) L(m)
Hm(m)
10
10
1.0
1.0
0.99
0.97
0.95
0.97
0.95
0.93
0.89 0.91
0.87
20 30 40 50 60 70 80 90 100 110 120 130140150 10 20 30 40 50 60 70 80 90 100 110 120 130140150
0
10
20
30
40
50
40
30
20
Hp(m)
Hm(m)
10
0
10
20
30
40
Change rate of cooling capacity Change rate of heating capacity
Variance ratio of heating capacity
NOTICE!
m
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
ft
0
33
66
98
131
164
197
230
262
295
328
361
394
427
459
492
5 Principal of Operation
Components in flowcharts are presented according to the following table:
Name Compressor 4-way valve Cut-off
valve
One-way valve Capillary tube
Symbol
Name Gas-liquid
separator
Pressure
switch
Pressure
sensor
Axial-flow finned heat
exchanger
Electronic expansion valve
Symbol
In cooling, the low-temperature and low-pressure refrigerant gas from each indoor heat
exchanger will be merged and inhaled by the compressor and then become high-temperature and
high-pressure gas, which will later be discharged into outdoor heat exchangers. By exchanging
heat with outdoor air, refrigerant will turn to liquid and flow to each indoor unit via Y-type branch or
manifold. Pressure and temperature of the refrigerant will then be lowered by throttle elements
before it flows into indoor heat exchangers. After exchanging heat with indoor air, refrigerant wil
become low-temperature and low-pressure gas again and repeat the circulation so as to realize
the cooling effect. In heating, 4-way valve will be energized to make refrigerant circulate in a
reverse direction of cooling. Refrigerant will release heat in indoor heat exchangers (electric
heating elements will also work under certain circumstance and release heat) and absorb heat in
outdoor heat exchangers circularly so as to realize the heating effect.

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CONTROL

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CONTROL
1 Units’ Control
1.1 Schematic Diagram of Units’ Control
(1) Interpretation on the schematic diagram
1) High pressure switch is used to identify system’s high and low pressure. When
pressure is too high, the switch will break off and send a signal to main board. Main
board will pass this signal to controller, where the error will be displayed, and stop
unit from working.
2) High/low pressure sensor is used to test unit’s high/low pressure and send real-time
data to controller, which will control each unit’s output according to the control logic.
3) Temperature sensors are used to test the tube temperature of the unit and send data
to the controller, which will control each unit’s output according to the control logic.

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1.2 Operation Flow Chart
1.2.1 Operation Flow Chart of Indoor Unit
(1) Cooling operation.
(2) Heating operation.
(3) Drying operation.
(4) Operation procedure is the same as that of cooling operation.
(5) Fan operation.
(6) The EXV of the indoor unit closes in fan mode, so that there is no refrigerant flow in the
refrigerant pipe of that indoor unit. But the fan of that indoor unit operates.

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1.2.2 Operation Flow Chart of Outdoor Unit
(1) Cooling operation.
(2) Heating operation.
1.3 Unit Control Functions
1.3.1 Control Functions of Outdoor Unit
(1) Include the following contents.
(2) Compressor capacity output.
(3) Compressor start-up control.
(4) Outdoor fan control.
(5) Defrosting control.
(6) Heating EXV control.
(7) Subcooling valve control.
(8) Refrigerant lacking control.
1.3.2 Control Functions of Indoor Unit
(1) Include the following contents.
(2) Cool.
(3) Dry.

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(4) Heat.
(5) Fan.
(6) Heating temperature compensation.
(7) Anti-freezing.
(8) Air swing.
(9) Drainage pump.
(10) IDU EXV.
(11) Static pressure level.
2 Wired Controller
2.1 Control Panel
NO.
Symbols
Instructions
1 Up and down swing function

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NO.
Symbols
Instructions
2 Left and right swing function
3
It's valid under Save mode and displays during setting process
Temperature lower limit for Cooling: Limit the minimum temperature value under
Cooling or Dry mode
Temperature upper limit for Heating: Limit the maximum
temperature value under Heating, Space Heating or 3D Heating mode
4
Auto mode (Under Auto mode, the indoor units will automatically select their
operating mode as per the temperature change so as to make the ambient
comfortable)
5
It shows the setting temperature value (In case the wired controller is controlling a
Fresh Air Indoor Unit, then the
temperature zone will display FAP)
6 Cooling mode
7 Dry mode
8 Fan mode
9 Heating mode
10 When inquiring or setting project number of indoor unit, it displays "NO." icon
11 Floor Heating mode (When Heating and Floor Heating
simultaneously shows up, it indicates 3D Heating is activated)
12 Display "SET" icon under parameter setting interface
13 Space Heating mode
14 Display "CHECK" icon under parameter view interface
15 Outdoor unit operates under Save mode/upper limit of system capacitor less
100%/remote Save status
16 Sleep status
17 Current set fan speed (including auto, low speed, medium-low speed, medium
speed, medium-high speed, high speed and turbo seven status)
18 Air status, Indoor unit optional function
19 Remind to clean the filter
20 Quiet status (including Quiet and Auto Quiet two status)
21 Allow auxiliary electric heating On icon
22 Light On/Off function
23 X-fan function

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NO.
Symbols
Instructions
24 Health function, Indoor unit optional function
25 Reserved function
26 Out function
27 Outdoor unit defrosting status
28 Gate-control function
29 Shielding status
30 Child Lock status
31 One wired controller controls multiple indoor units
32 Save status of indoor unit
33 It indicates the current wired controller is the slave wired controller (address of
wired controller is 02)
34 Memory status (The indoor unit resumes the original setting state after power
failure and then power recovery)
35 Invalid operation
36 Current wired controller connects master indoor unit
37 Timer zone:Display system clock and timer status
NOTICE! When wired controller is connected with different indoor units, some functions will be different
Button Graphics

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2.2 Installation and Removal
2.2.1 Installation Dimensions
mm
112
22
2.4
3.5
4
5
12.7
24
26.8
30
84
inch
4.41
0.87
0.09
0.14
0.16
0.20
0.50
0.94
1.06
1.18
3.31
2.2.2 Installation Method
1 2 3 4
6
910
57
8
Above is the simple installation process of wired controller; please pay attention to the
following items:
(1) Before installation, please cut off the power for indoor unit.
(2) Pull out the two-core twisted pair from the installation hole on wall, and then pull this wire
through the " ” shape hole at the rear side of Soleplate of wired controller.
(3) Stick the bottom plate of wired controller on the wall and then use Self-tapping Screw
ST3.9×25 MA or Screw M4×25 to fix Soleplate and installation hole on wall together.
(4) Connect two-core twisted pair to H1 and H2 wiring column and then fix the screws.

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(5) Tidy up the lines in slot on the back of the panel, and then bundle the front panel of wired
controller to its soleplate and the installation is completed.
NOTICE!If the wire size of the selected communication line is too large, you can peel some
sheath layer of communication wire to satisfy installation requirements.
If caliber of the communication cord is too large, which causes difficulty in leading or sticking the cord according to
above point 2 and point 5, strip some of the sheath of the communication cable to meet the installation requirement.
2.2.3 Removal Method
1 2 3 4
2.2.4 Connection of Communication Cord
There are 4 ways to connect wired controller with indoor units’ network:
One wired controller control one indoor unit Two wired controllers controls one indoor unit

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One wired controller controls multiple indoor units simultaneously.
Two wired controllers control multiple indoor units simultaneously.