Gree GMV-Y120WL/A-T User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Photovoltaic Multi VRF
Models:
GMV-Y120WL/A-T
GMV-Y140WL/A-T
GMV-Y160WL/A-T

To Users
Thank you for selecting Gree’s product. Please read this instruction manual carefully
before installing and using the product, so as to master and correctly use the product. In order
to guide you to correctly install and use our product and achieve expected operating effect, we
hereby instruct as below:
(1)This appliance can be used by children aged from 8 years and above and persons with
reduced physical sensory or mental capabilities or lack of experience and knowledge if
they have been given supervision or instruction concerning use of the appliance in a
safe way and understand the hazards involved. Children shall not play with the
appliance. Cleaning and user maintenance shall not be made by children without
supervision.
(2)In order to ensure reliability of product, the product may consume some power under
stand-by status for maintaining normal communication of system and preheating
refrigerant and lubricant. If the product is not to be used for long, cut off the power
supply; please energize and preheat the unit in advance before reusing it.
(3)Please properly select the model according to actual using environment, otherwise it
may impact the using convenience.
(4)This product has gone through strict inspection and operational test before leaving the
factory. In order to avoid damage due to improper disassembly and inspection, which
may impact the normal operation of unit, please do not disassemble the unit by yourself.
You can contact with the special maintenance center of our company if necessary.
(5)For personal injury or property loss and damage caused by improper operation such as
improper installation and debugging, unnecessary maintenance, violation of related
national laws and rules and industrial standard, and violation of this instruction manual,
etc., we will bear no liability.
(6)When the product is faulted and cannot be operated, please contact with our
maintenance center as soon as possible by providing the following information.
1)Contents of nameplate of product (model, cooling/heating capacity, product No.,
ex-factory date).
2)Malfunction status (specify the situations before and after the error occurs).
(7)All the illustrations and information in the instruction manual are only for reference. In
order to make the product better, we will continuously conduct improvement and
innovation. We have the right to make necessary revision to the product from time to
time due to the reason of sales or production, and reserve the right to revise the
contents without further notice.
(8)The final right to interpret for this instruction manual belongs to Gree Electric Appliances
Inc. of Zhuhai.

Contents
1 SAFETY NOTICES (PLEASE BE SURE TO ABIDE) ......................................................................................... 1
2 PRODUCT INTRODUCTION................................................................................................................................ 3
2.1 Names of Main Parts............................................................................................................................................ 3
2.2 Combinations of Indoor and Outdoor Units ...................................................................................................... 4
2.3 Operating Range .................................................................................................................................................. 4
3 PREPARATION BEFORE INSTALLATION ......................................................................................................... 4
3.1 Standard Parts....................................................................................................................................................... 4
3.2 Installation Site...................................................................................................................................................... 5
3.3 Piping Work Requirements.................................................................................................................................. 5
4 INSTALLATION INSTRUCTION........................................................................................................................... 6
4.1 Dimension of Outdoor Unit and Mounting Hole................................................................................................ 6
4.2 Connection Pipe.................................................................................................................................................... 7
4.3 Installation of Connection Pipe......................................................................................................................... 11
4.4 Vacuum Pumping, Refrigerant Adding............................................................................................................. 14
4.5 Electric Wiring..................................................................................................................................................... 16
4.6 Installation project of photovoltaic system ...................................................................................................... 19
5 CHECK ITEMS AFTER INSTALLATION AND TEST OPERATION................................................................. 22
5.1 Check Items after Installation............................................................................................................................ 22
5.2 Test operation and debugging........................................................................................................................... 22
6 COMMON MALFUNCTIONS AND TROUBLESHOOTING.............................................................................. 29
7 ERROR INDICATION.......................................................................................................................................... 30
8 FUNCTION SETTING OF OUTDOOR UNIT...................................................................................................... 34
8.1 ODU Quiet Function........................................................................................................................................... 34
8.2 Cool & Heat Function......................................................................................................................................... 35
8.3 Forced Defrosting............................................................................................................................................... 36
8.4 Restore Factory Defaults................................................................................................................................... 37
8.5 Static Pressure Function.................................................................................................................................... 37
9 MAINTENANCE AND CARE.............................................................................................................................. 37
9.1 Outdoor Heat Exchanger................................................................................................................................... 37
9.2 Drain Pipe............................................................................................................................................................ 38
9.3 Notice before Seasonal Use............................................................................................................................. 38
9.4 Maintenance after Seasonal Use..................................................................................................................... 38
9.5 Parts Replacement............................................................................................................................................. 38
10 AFTER-SALES SERVICE................................................................................................................................. 38

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1 Safety Notices (Please be sure to abide)
Warning: If not abide strictly, it may cause severe damage to the unit or the people.
Note: If not abide strictly, it may cause slight or medium damage to the unit or the
people.
This sign indicates that the operation must be prohibited. Improper operation may
cause severe damage or death to people.
This sign indicates that the items must be observed. Improper operation may cause
damage to people or property.
WARNING!
This product can’t be installed at corrosive, inflammable or explosive environment or the
place with special requirements, such as kitchen. Otherwise, it will affect the normal
operation or shorten the service life of the unit, or even cause fire hazard or serious injury.
As for above special places, please adopt special air conditioner with anti-corrosive or
anti-explosion function.
Please install the unit
according to instructions in
this manual. Read this
manual carefully before
starting up or checking the
machine.
Installation should be
performed by distributor or
qualified technicians. Do not
install the product by
yourself. Improper
installation may result in
water leakage, electric
shock or fire hazard.
Before installation, please
check the power cord if it
complies with the power
supply requirement on the
nameplate. Make sure the
power supply is safe.
This air conditioner must be
properly grounded through
the receptacle to avoid
electric shock. The ground
wire shouldn’t be connected
with gas pipe, water pipe,
lightning arrester or
telephone line.
When installing, specialized
parts and accessories must
be used. Otherwise, it may
result in water leakage,
electric shock or fire hazard.
R410A refrigerant can
produce poisonous gas
once it meets fire, so please
ventilate the room
immediately if refrigerant
leaks out during installation.
Diameter of power cord
must be large enough.
Damaged power cord or
connecting wire must be
replaced by specialized
electric cable.
After the power cord is
connected, please install the
cover of electric box to avoid
danger
Nitrogen must be charged
according to technical
requirements.
Short circuit is forbidden. Do
not cancel the pressure
switch, otherwise unit may
be damaged.

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For units with wired
controllers, do not connect
power supply until the wired
controller is well installed.
Otherwise, the wired
controller cannot be used.
When installation is finished,
please check and make
sure the drain pipe, pipeline
and electric wire are all well
connected so as to avoid
water leakage, refrigerant
leakage, electric shock and
fire hazard.
Do not extend fingers or
objects into air outlet or
return air grille.
If you use gas heater or
petroleum heater in the
same room, please open the
door or window to maintain
good air circulation,
otherwise the room may be
lack of oxygen.
Never start or stop the air
conditioner by inserting or
removing the power cord.
Do not turn off the air
conditioner until it runs for at
least 5 minutes. Otherwise,
oil return of the compressor
will be affected.
Children are not allowed to
operate the air conditioner.
Do not operate the air
conditioner with wet hands.
Please turn off and unplug
your air conditioner before
cleaning. Otherwise, it may
cause electric shock or
personal injury.
Do not spray water on the
air conditioner or it will
cause malfunction or electric
shock.
Do not expose the air
conditioner directly under
damp or corrosive
surroundings.
Connect power 8 hours
before operation. Do not
disconnect power when you
want to stop the unit in a
short period of time, e.g. in
one night. (This is for
protecting the compressor.)
Volatile liquid like thinner or
gasoline will damage the
appearance of air
conditioner. (Please use soft
dry cloth and wet cloth with
mild detergent to clean
unit’s outer case.)
Under cool mode, do not set
the indoor temperature too
low. Keep the difference
between indoor temp and
outdoor temp within 5℃.

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If abnormal condition occurs
(e.g. unpleasant smell),
please turn off the unit at
once and disconnect power
supply. Then contact Gree
authorized service center. If
the air conditioner continues
to operate despite of
abnormal condition, it may
be damaged and cause
electric shock or fire
hazard.)
Do not repair the air
conditioner by yourself.
Improper repair will cause
electric shock or fire hazard.
Please contact Gree
authorized service center
and ask professional
technicians to repair it.
This appliance can be used by children aged from 8 years and above and persons with
reduced physical, sensory or mental capabilities or lack of experience and knowledge if they
have been given supervision or instruction concerning use of the appliance in a safe way and
understand the hazards involved. Children shall not play with the appliance. Cleaning and user
maintenance shall not be made by children without supervision.
Install units according to national wiring codes.
If the supply cord is damaged, it musr be replaced by the manufacturer or its service agent
or a similarly qualified person in order to avoid a hazard.
An all-pole disconnection device which has at least 3mm clearances in all poles, and
disconnection must be incorporated in the fixed wiring in accordance with the wiring rules.
Gree Electric Appliances, Inc. of Zhuhai will not assume responsibility for any personal injury or property loss
caused by improper installation, improper debugging, unnecessary repair or not following the instructions of
this manual.
2 Product Introduction
Gree Multi VRF System adopts inverter compressor technology. By changing the
displacement of compressor, stepless capacity regulation within range of 10%~100% can be
realized. Various product lineups are provided with capacity range from 12.1kW to 16kW, which
can be widely used in residential, commercial and working area and especially applicable to
places with big load change. Gree residential air conditioner is absolutely your best choice.
2.1 Names of Main Parts
GMV-Y120WL/A-T
GMV-Y140WL/A-T
GMV-Y160WL/A-T

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No.
①
②
③
④
⑤
Name
Motor
Fan blade
Electric box
assembly
Gas pipe valve
Liquid pipe
valve
2.2 Combinations of Indoor and Outdoor Units
(1)See below the number of indoor units that can be connected to the outdoor unit.
(2)The total capacity of indoor units should be within 50%~135% of that of the outdoor
unit.
Model
Min sets of connectable IDUs
Max sets of connectable IDUs
GMV-Y120WL/A-T
2
7
GMV-Y140WL/A-T
2
8
GMV-Y160WL/A-T
2
9
(3)Can be connected to various indoor units. When any one of the indoor units receives
operating command, outdoor unit will start operation as per required capacity. When
all indoor units stop, outdoor unit will be shut off.
2.3 Operating Range
Cooling
Outdoor temperature: -5℃～52℃
Heating
Outdoor temperature: -20℃～27℃
3 Preparation before Installation
Note: Graphics here are only for reference. Please refer to actual products. Unspecified dimensions are
all in mm.
3.1 Standard Parts
Please use the supplied standard parts as required.
Parts for Outdoor Unit
No.
Name
Appearance
Qty
Remark
1
User Manual
1
2
Wiring (match with
resistance)
1
Must be connected to the
last IDU of communication
connection
3
Corrugated pipe
1
4
Chassis gluey plug
3
5
Drainage joint
1

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3.2 Installation Site
Forbidden item! Improper operation might lead to personal injury or even death.
Item needs to be followed. Improper operation might lead to personal injury or property damage.
Select a location which is
strong enough to hold unit’s
weight so that unit can stand
still and erect.
Make sure the unit is not
exposed to sun and rain. And
the location can resist dust,
typhoon and earthquake.
Please keep the unit away
from inflammable, explosive
and corrosive gas or waste
gas.
Make sure the location has
space for heat exchange and
maintenance so that unit can
operate reliably with good
ventilation.
ODU and IDU should stay as
close as possible to shorten
the length of refrigerant pipe
and reduce bend angles.
Select a location which is out of
children’s reach. Keep the unit
away from children.
If the ODU is totally surrounded by walls, please refer to the following figures for space
dimension:
3.3 Piping Work Requirements
Refer to the table below for piping work requirements:
R410A Refrigerant System
Outer diameter (mm/inch)
Wall thickness(mm)
Φ6.35(1/4)
≥0.8
Φ9.52(3/8)
≥0.8
Φ12.70(1/2)
≥0.8
Φ15.9(5/8)
≥1.0
Φ19.05(3/4)
≥1.0

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4 Installation Instruction
Note: Graphics here are only for reference. Please refer to actual products. Unspecified dimensions are
all in mm.
4.1 Dimension of Outdoor Unit and Mounting Hole
Unit Outline and Installation Dimension（mm）
Unit: mm
Model
A
B
C
D
E
GMV-Y120WL/A-T
GMV-Y140WL/A-T
GMV-Y160WL/A-T
900
340
1345
572
378

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4.2 Connection Pipe
4.2.1 Schematic Diagram of Piping Connection
4.2.2 Allowable Length and Height Difference of Connection Pipe
Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is
shown in the figure below:
Note：Equivalent length of one Y-type branch is 0.5m.

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Allowable Length and Height Difference of Connection Pipe
Piping parameters of GMV-Y120WL/A-T, GMV-Y140WL/A-T, GMV-Y160WL/A-T,
Allowable
value
Fitting pipe
Total length (actual length) of fitting pipe
300m
L1+L2+L3+a+b+c+d
Length of farthest fitting pipe (m)
Actual length
120m
L1+L2+L3+d
Equivalent length
150m
From the 1st branch to the farthest indoor pipe
40m
L2+L3+d
Height difference between ODU
and IDU
ODU at upper side
50m
——
ODU at lower side
40m
——
Height difference between IDUs
15m
——
4.2.3 Dimension of Pipe (Main Pipe) from ODU to the 1st Indoor Branch
Dimension of pipe from ODU to the 1st indoor branch will be determined by the dimension
of outdoor connection pipe.

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Dimension of outdoor connection pipe
Basic module
Pipe dimension
Gas pipe (mm)
Liquid pipe（mm）
GMV-Y120WL/A-T
Φ15.9
Φ9.52
GMV-Y140WL/A-T
Φ15.9
Φ9.52
GMV-Y160WL/A-T
Φ19.05
Φ9.52
4.2.4 Selection of Indoor Branches
Select indoor branches according to the total capacity of downstream indoor units. If the
capacity exceeds that of the outdoor unit, capacity of outdoor unit prevails.
R410A Refrigerant system
Total capacity of downstream indoor units X (kW)
Model
Y type branch
X＜20
FQ01A
20≤X≤30
FQ01B
30＜X≤70
FQ02
70＜X≤135
FQ03
135＜X
FQ04
4.2.5 Dimension of Pipe between Indoor Branches
Select pipe between indoor branches according to the capacity of downstream indoor units;
if the capacity exceeds that of the outdoor unit, capacity of outdoor unit prevails.

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Total capacity of downstream indoor units C (kW)
Gas pipe（mm）
Liquid pipe（mm）
C ≤5.6
Φ12.7
Φ6.35
5.6＜C≤14.2
Φ15.9
Φ9.52
14.2＜C≤22.4
Φ19.05
Φ9.52
4.2.6 Dimension of Pipe between Indoor Branch and IDU
Dimension of pipe between indoor branch and IDU should be consistent with the
dimension of indoor pipe.
Rated capacity of IDU C(kW)
Gas pipe (mm)
Liquid pipe (mm)
C≤2.8
Φ9.52
Φ6.35
2.8＜C≤5.0
Φ12.7
Φ6.35
5.0＜C≤14.0
Φ15.9
Φ9.52
14.0＜C≤16.0
Φ19.05
Φ9.52
16.0＜C≤28.0
Φ22.2
Φ9.52
Note: If the distance between IDU and its nearest branch is over 10m, then the liquid pipe of IDU (rated
capacity ≤5.0kW) shall be enlarged.

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4.3 Installation of Connection Pipe
4.3.1 Precautions for the Installation of Connection Pipe
(1)Conform to the following principles during pipe connection: Connection pipe should be
as short as possible, so is the height difference between indoor and outdoor units.
Keep the number of bends as little as possible. Radius of curvature should be as large
as possible.
(2)Weld the connection pipe between indoor and outdoor units. Please strictly follow the
requirements for welding process. Rosin joint or pin hole is not allowed.
(3)Radius of bending parts should be over 200mm. Note that pipes cannot be repeatedly
bent or stretched; otherwise the material will get harder. Do not bend or stretch the
pipe for more than 3 times at the same position.
4.3.2 Flaring Process
(1)Use pipe cutter to cut the connection pipe in case it is unshaped.
(2)Keep the pipe downward in case cutting scraps get into the pipe. Clear away the burrs
after cutting.
(3)Remove the flared nut connecting indoor connection pipe and outdoor unit. Then use
flaring tool to fix the flared nut into the pipe.
(4)Check if the flared part is flaring evenly and if there is any crack.
4.3.3 Pipe Bending
(1)Reshape the pipe by hand. Be careful not to damage the pipe.
(2)Do not bend the pipe over 90°.
(3)If pipe is repeatedly bent or stretched, it will get hard and difficult to bend and stretch
again. Therefore, do not bend or stretch the bend for over 3 times.
(4)In case that direct bending will open cracks to the pipe, first use sharp cutter to cut the
insulating layer. Do not bend the pipe until it is exposed. When bending is done, wrap
the pipe with insulating layer and then secure it with adhesive tape.

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4.3.4 Indoor Pipe Connection
(1)Remove pipe cover and pipe plug.
(2)Direct the flared part of copper pipe to the center of screwed joint. Twist on the flared
nut tightly by hand. (Make sure indoor pipe is correctly connected. Improper location of
the center will prevent flared nut from being securely twisted. Thread of nut will get
damaged if the flared nut is twisted forcibly.)
(3)Use torque wrench to twist on the flared nut tightly until the wrench gives out a click
sound. (Hold the handle of wrench and make it at right angle to the pipe.)
(4)Use sponge to wrap the un-insulated connection pipe and joint. Then tie the sponge
tightly with plastic tape.
(5)Connection pipe should be supported by a bearer rather than the unit.
(6)The bending angle of piping should not be too small; otherwise the piping might have
cracks. Please use a pipe bender to bend the pipe.
(7)When connecting IDU with connection pipe, do not pull the big and small joints of IDU
with force in case the capillary tube or other tubes have cracks and cause leakage.
4.3.5 Outdoor Pipe Connection
Twist the flared nut on the connection pipe of outdoor valves. Twisting method is the same
as for indoor pipe connection.
Below is the piping diagram of GMV-Y120WL/A-T, GMV-Y140WL/A-T, GMV-Y160WL/A-T,.
According to customer requirement or space limit, outlet pipe can be installed from the front,
right or rear side.
Pipe diameter
Tightening torque
φ 6.35mm
15～30（N·m）
φ 9.52mm
35～40（N·m）
φ12.7mm
45～50（N·m）
φ15.9mm
60～65（N·m）

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4.3.6 Installation of Y-type Branch
(1) Y-type Branch
(2)Y-type branch has several pipe sections with different dimension, which facilitates to
match with various copper pipes. Use pipe cutter to cut in the middle of the pipe
section that is of proper dimension and remove burrs as well.
(3)Y-type branch must be installed vertically or horizontally.
(4)Branch shall be isolated by insulating material that can bear 120°or even higher
temperature. The attached foam of branch cannot be taken as insulating material.
4.3.7 Thermal Insulation for Pipeline
(1)For multi VRF system, every copper pipe should be labeled so as to avoid
misconnection.
(2)At the branch inlet, leave at least 500mm straight pipe section.
(3)Thermal insulation for pipeline
1) To avoid condensate or water leakage on the connection pipe, the gas pipe and liquid
pipe must be wrapped with thermal insulating material and adhesive tape for
insulation from the air.
2) Thermal insulating material shall be able bear the pipe temperature. For heat pump
unit, liquid pipe should bear 70℃or above and gas pipe should bear 120℃or
above. For cooling only unit, both liquid pipe and gas pipe should bear 70℃or
above.
3) Example: Polyethylene foam (bear 120℃or above); foaming polyethylene (bear
100℃or above)

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4) Joints of indoor and outdoor unit should be wrapped with insulating material and
leave no gap between pipe and wall..
5)Thermal insulating material of branches should be the same as that of the pipeline.
The attached foam of branches cannot be taken as insulating material.
6) When wrapping the tape, the later circle should cover half of the former one. Don’t
wrap the rape too tight, otherwise the insulation effect will be weakened.
7) After wrapping the pipe, apply sealing material to completely seal the hole on the
wall.
4.3.8 Support and Protection of Pipeline
(1)Support should be made for hanging connection pipe. Distance between each support
cannot be over 1m.
(2)Protection against accidental damage should be made for outdoor pipeline. When
pipeline exceeds 1m, a pinch board should be added for protection.
4.4 Vacuum Pumping, Refrigerant Adding
4.4.1 Vacuum Pumping
(1)Outdoor unit has been charged with refrigerant before delivery. Field-installed
connection pipe needs to be charged with additional refrigerant.
(2)Confirm whether outdoor liquid and gas valves are closed.
(3)Use vacuum pump to withdraw the air inside indoor unit and connection pipe from the
outdoor valve, as shown below.

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4.4.2 Refrigerant Adding
(1)Refrigerant quantity of outdoor unit before delivery:
Model
GMV-Y120WL/A-T
GMV-Y140WL/A-T
GMV-Y160WL/A-T
Refrigerant Qty (kg)
3.3
3.3
3.3
Note:
①The refrigerant amount charged before delivery doesn’t include the amount that needs to be
added to indoor units and the connection pipeline.
②Length of connection pipe is decided on site. Therefore the amount of additional refrigerant
shall be decided on site according to the dimension and length of field-installed liquid pipe.
③Record the amount of additional refrigerant for convenience of after-sales service.
(2)Calculation of the amount of additional refrigerant
When the ODU is GMV-Y***WL/A-T, adding refrigerant method includes 3 steps as follow:
1)Amount of additional refrigerant depending on the pipe size(X)
2)Amount of additional refrigerant depending on Quantity of IDU(Y)
3)Amount of additional refrigerant depending on certain model of IDU(Z)
Total charging amount =X+Y+Z
Detail calculation is as follow:
1)X= ∑(Liquid pipe length×amount of additional refrigerant of each 1m)
Size of liquid pipe (mm)
Φ19.05
Φ15.9
Φ12.7
Φ9.52
Φ6.35
Additional amount(kg/m)
0.250
0.170
0.110
0.054
0.022
2)Y=(Quantity of IDU－2)x0.3 kg
3)List of certain model of IDU require amount of additional refrigerant Z
is as follow
(Unit: kg)
Capacity
Model
2.8
3.2
3.6
4.0
5.6
6.3
7.1
8.0
9.0
10.0
11.2
12.5
Big Duct Type
GMV-NDR**PH/B1-T
0.50
0.50
0.50
0.50
1.10
1.10
1.10
1.10
1.10
1.15
1.15
1.15
Big Cassette Type
GMV-ND**T/A1-T
1.00
1.00
1.00
Example：

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No.
IDU ①
IDU ②
IDU ③
IDU ④
Model
Duct type
GMV-NDR40PH/B1-T
Duct type
GMV-NDR40PH/B1-T
Duct type
GMV-NDR40PH/B1-T
Duct type
GMV-NDR40PH/B1-T
Liquid pipe
No.
A
B
C
D
Pipe size
Φ9.52
Φ9.52
Φ9.52
Φ9.52
Length
10m
5m
4m
5m
No.
a
b
c
d
Pipe size
Φ9.52
Φ9.52
Φ9.52
Φ9.52
Length
3m
3m
2m
1m
1)Amount of additional refrigerant depending on the pipe size(X)
Total length of each liquid pipe: Φ9.52：A+B+C+D+a+b+c+d=10+5+4+5+3+3+2+1=33m
2)Amount of additional refrigerant depending on Quantity of IDU(Y)
Quantity of indoor unit: 4 sets
3)Amount of additional refrigerant depending on certain model of IDU(Z)
IDU includes GMV-NDR40PH/B1-T
Therefore, the total charging amount＝(33×0.054)+(4-2)×0.3+0.5x4＝4.382kg
4.5 Electric Wiring
4.5.1 Notices for Wiring
(1)Install units according to national wiring codes.
(2)Use air conditioner specialized power supply and make sure that it is consistent with
system’s rated voltage.
(3)Do not pull the power cord with force.
(4)All electrical installation must be performed by qualified technicians in accordance with
local laws, regulations and this user manual.

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(5)Caliber of the power cord must be large enough. A damaged power cord or connection
wire must be replaced by specialized electrical cords.
(6)If the supply cord is damaged, it must be replaced by the manufacturer or its service
agent or a similarly qualified person in order to avoid a hazard;
(7) An all-pole disconnection device which has at least 3mm clearances in all poles, and
disconnection must be incorporated in the fixed wiring in accordance with the wiring
rules.
(8) Connect the unit to specialized grounding device and make sure it is securely
grounded. It’s a must to install air switch and current circuit breaker that can cut off
the power of the entire system. The circuit breaker should include magnetic trip
function and thermal trip function so that system can be protected from short circuit
and overload.
(9) Grounding Requirements
1)Air conditioner belongs to class I electrical appliance, so it must be securely
grounded.
2)The yellow-green wire inside the unit is a ground wire. Do not cut it off or secure it
with tapping screws, otherwise it will lead to electric shock.
3)Power supply must include secure grounding terminal. Do not connect the ground
wire to the following:
①Water pipe；②Gas pipe；③Drain pipe；
④Other places that are deemed as not secure by professional technicians.