Gree GMV-ND22TD/A-T User manual

Owner's Manual
Air Conditioners
Models:
GMV-ND22TD/A-T
GMV-ND28TD/A-T
GMV-ND36TD/A-T
GMV-ND45TD/A-T
GMV-ND50TD/A-T
Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference. If you have lost the Owner’s Manual, please
contact the local agent or visit www.gree.com or send email to [email protected]m.cn for
electronic version.
GREE reserves the right to interpret this manual which will be subject to any change due to
product improvement without further notice.
GREE Electric Appliances, Inc. of Zhuhai reserves the final right to interpret this manual.
Multi Variable Air Conditioners
One-way Cassette Type Indoor Unit

Preface
For correct installation and operation, please read all instructions carefully. Before reading the
instructions, please be aware of the following items:
(1) For the safe operation of this unit, please read and follow the instructions carefully.
(2) During operation, total capacity of indoor units should not exceed the total capacity of
outdoor units. Otherwise, poor effect of cooling or heating may result.
(3) Direct operators or maintainers should well keep this manual.
(4) If this unit fails to operate normally, please contact our service center as soon as
possible and provide the following information:
Content on the nameplate (model number, cooling capacity, production code,
ex-factory date).
Malfunction details (before and after the malfunction occurs).
(5) Each unit has been strictly tested and proved to be qualified before ex-factory. In
order to prevent units from being damaged or operating normally because of improper
disassembly, please do not disassemble the unit by yourself. If you need to disassemble and
check units, please contact our service center. We will send specialists to guide the
disassembly.
(6) All graphics in this manual is only for your reference. For sales or production reasons,
these graphics are subject to change by manufacturer without prior notice.
User Notice
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.
DISPOSAL: Do not dispose this product as unsorted municipal waste. Collection
of such waste separately for special treatment is necessary.

Contents
1 Safety Precautions .................................................................................................. 1
2 Product Introduction ................................................................................................ 3
2.1 Names of Key Components......................................................................................... 3
2.2 Rated Working Condition............................................................................................. 3
3 Preparations for Installation..................................................................................... 4
3.1 Standard Fittings.......................................................................................................... 4
3.2 Installation Position Selection....................................................................................... 5
3.3 Requirements of Communication Wire Selection ......................................................... 5
3.4 Wiring Requirement..................................................................................................... 7
4 Installation Instructions............................................................................................ 7
4.1 Indoor Unit Installation ................................................................................................. 7
4.2 Refrigerant Pipe Connection........................................................................................ 9
4.3 Drainage Pipe Installation and Drainage System Testing............................................. 9
4.4 Panel Installation.........................................................................................................12
4.5 Wired Controller Installation........................................................................................14
5 Wiring Work........................................................................................................... 14
5.1 Connection of Wire and Patch Board Terminal ...........................................................14
5.2 Power Cord Connection..............................................................................................15
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit (or indoor
unit) ..................................................................................................................................15
5.4 Connection of Communication Wire for Wired Controller ............................................16
5.5 Instructions on Connecting Wired Controller and Indoor Units Network ......................17
6 Routine Maintenance............................................................................................. 19
6.1 Cleaning of Filter.........................................................................................................19
6.2 Maintenance before the Seasonal Use .......................................................................19
6.3 Maintenance after the Seasonal Use ..........................................................................19
7 Table of Error Codes for Indoor Unit...................................................................... 20
8 Troubleshooting..................................................................................................... 20

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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1 Safety Precautions
Means items that must be forbidden! Otherwise, it may lead to personal injury or death or
serious damage.
Means items that must be followed! Otherwise, it may lead to personal injury or property loss.
Please install the unit according
to instructions in this manual.
Read this manual carefully
before starting up or checking
the machine.
Installation should be
conducted by dealer or qualified
personnel. Please do not
attempt to install the unit by
yourself. Improper handling
may result in water leakage,
electric shock or fire disaster
etc.
Before installation, please
check if the power supply is in
accordance with the
requirements specified on the
nameplate. And also take care
of the power safety.
Make sure the unit can be
earthed properly and soundly
after plugging into the socket so
as to avoid electric shock.
Please do not connect the
ground wire to gas pipe, water
pipe, lightning rod or telephone
line.
Be sure to use the exclusive
accessory and part to prevent
the water leakage, electric
shock and fire accidents.
If refrigerant leakage happens
during installation, please
ventilate immediately.
Poisonous gas will emerge if
the refrigerant gas meets fire.
Wire size of power cord should
be large enough.The damaged
power cord and connection wire
should be replaced by exclusive
cable.
After connecting the power
cord, please fix the electric box
cover properly in order to avoid
accident.
Never fail to comply with the
nitrigen charge
requirements.Charge nitrogen
when welding pipes.
Never short-circiut or cancel the
pressure switch to prevent unit
damage.
Please firstly connect the wired
controller before energization,
otherwise wired controller can
not be used.
Before using the unit, please
check if the piping and wiring
are correct to avoid water
leakage, refrigerant leakage,
electric shock, or fire etc.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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Do not insert fingers or objects
into air outlet/inlet grille.
Open the door and window and
keep good ventilation in the
room to avoid oxygen deficit
when the gas/oil supplied
heating equipment is used.
Never start up or shut off the air
conditioner by means of directly
plug or unplug the power cord.
Turn off the unit after it runs at
least five minutes; otherwise it
will influence oil return of the
compressor.
Do not allow children operate
this unit.
Do not operate this unit with wet
hands.
Turn off the unit or cut off the
power supply before cleaning
the unit, otherwise electric
shock or injury may happen.
Never spray or flush water
towards unit, otherwise
malfunction or electric shock
may happen.
Do not expose the unit to the
moist or corrosive
circumstances.
Electrify the unit 8 hours before
operation. Please switch on for
8 hours before operation. Do
not cut off the power when 24
hours short-time halting (to
protect the compressor).
Volatile liquid, such as diluent
or gas will damage the unit
appearance.Only use soft cloth
with a little neutral detergent to
clean the outer casing of unit.
Under cooling mode, please
don't set the room temperature
too low and keep the
temperature difference between
indoor and outdoor unit within 5.
If anything abnormal happens
(such as burning smell), please
power off the unit and cut off the
main power supply, and then
immerdiately contact Gree
appointed service center.If
abnormality keeps going, the
unit might be damaged and lead
to electric shock or fire.
Do not repair the air conditioner
by yourself. Improper repair will
cause electric shock or fire
hazard. Please contact GREE
service center and have it
repaired by professional
technicians.
Any personal injury or property loss caused by improper installation, improper debug,
unnecessary repair or not following the instructions of this manual should not be the responsibility
of Gree Electric Appliances, Inc. of Zhuhai.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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2 Product Introduction
2.1 Names of Key Components
No.
①
②
③
④
⑤
Name
Connection pipe
Panel
Air louver
Swing blade
Air-in grille
No.
⑥
⑦
⑧
⑨
Name
Built-in filter
Main body
Drainage device
(built-in)
Drainage Pipe
2.2 Rated Working Condition
Test condition
Indoor Side Condition
Outdoor Side Condition
Dry Bulb Temp℃(℉)
Wet Bulb Temp℃(℉)
Dry Bulb Temp℃(℉)
Wet Bulb Temp℃(℉)
Rated Cooling
27(80.6)
19(66.2)
35(95)
24(75.2)
Rated Heating
20(68.0)
15(59.0)
7(44.6)
6(42.8)

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3 Preparations for Installation
Note: This picture is for reference only, please refer to the actual product, the unit of
dimension is mm.
3.1 Standard Fittings
Use the following provided accessories according to the requirement.
No.
Name
Appearance
Q'ty
Usage
1
wireless controller
1
To control the indoor unit
2
paper pattern for
installation
1
Locate the drill hole on ceiling
3
Tapping screw with
washer
4
Fix paper pattern
4
Washer fixing plate
4
Prevent the washer from falling off
5
Drain Hose Assembly
1
To connect with the hard PVC
drain pipe
6
Special Nut
1
To be used for connecting the
refrigerant pipe
7
M10X8 Nut with Washer
4
To be used together with the
hanger bolt for installing the unit.
8
M10 Nut (M10X8.4 Nut)
4
To be used together with the
hanger bolt for installing the unit.
9
M10 Washer (Spring
Washer M10X2.6)
4
To be used together with the
hanger bolt for installing the unit.
10
Insulation
1
To insulate the gas pipe
11
Insulation
1
To insulate the liquid pipe
12
Sponge
1
To insulate the drain pipe
13
Fastener
4
To fasten the sponge

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3.2 Installation Position Selection
(1) The appliance shall not be installed in the laundry.
(2) The location should be able to withstand the weight of unit.
(3) The water can be drained conveniently from drainage pipe.
(4) There should be no obstruction near air inlet and air outlet.
(5) Follow the installation distance required in the fig below to ensure sufficient space for
maintenance.
(6) The installation location should be far from heat sources, flammable or explosive gas,
or smog spread in the air.
(7) The indoor unit, outdoor unit, power cord and connection electricity wire should be at
least 1m from television and radio in order to prevent interference and noise. (Even though
1m distance is ensure, there may be noise if the electric wave is too strong.)
Unit: mm
Fig 3.2
Notes:
①The unit shall be installed in accordance with national standards or local regulations.
②Only qualified personnel can carry out installation work, please contact with local dealer
before installation.
③Make sure all the installation work completed before energizing.
3.3 Requirements of Communication Wire Selection
Note:
If air conditioner used under strong electronic-magnetic interference circumstance, STP
(shielded twisted pair) communication cable must be adopted.

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3.3.1 Selection of Communication Wire between Indoor Unit and Wired Controller
Fig 3.3.1
Material type
Total length of
communication
line between
indoor unit and
wired controller L
(m/ft.)
Wire size (mm2/AWG)
Material
Standard
Remarks
Light/Ordinary
polyvinyl
chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L250m
(L 820-1/5ft.)
2×0.75~2×1.25
(2×AWG18~2×AW
G16)
IEC
60227-5
1. Total length of
communication line can't
exceed 250m (820-1/5ft.).
2. The cord shall be Circular
cord (the cores shall be twisted
together).
3. If unit is installed in places
with intense magnetic field or
strong interference, it is
necessary to use shielded wire.
3.3.2 Selection of Communication Wire between Indoor Unit and Indoor Unit (or
Outdoor Unit)
Fig 3.3.2
Material Type
Total Length L (m/ft.)
of Communication
Cable between
Indoor Unit and
Indoor (Outdoor) Unit
Wire size
(mm2/AWG)
Material
Standard
Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L1000m
(L 3280-5/6ft.)
2×0.75
( 2×AWG18)
IEC 60227-5
1. If the wire diameter is enlarged to
2×1 mm2(2×AWG16), the total
communication line length can reach
1500 m (4921-1/4ft.).
2. The cord shall be Circular cord (the
cores shall be twisted together).
3. If unit is installed in places with
intense magnetic field or strong
interference, it is necessary to use
shielded wire.

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3.4 Wiring Requirement
Dimension of power cord and capacity of air switch.
Model
Power Cord Size
Air Switch Capacity
(A)
Minimum Sectional
Area of Ground
Wire (mm2)
Minimum Sectional
Area of Power Cord
(mm2)
GMV-ND22TD/A-T
GMV-ND28TD/A-T
GMV-ND36TD/A-T
GMV-ND45TD/A-T
GMV-ND50TD/A-T
208-230V ~ 60Hz
220-240V ~ 50Hz
6
1.0
1.0
Notes:
①An all-pole disconnection switch having a contact separation of at least 3mm in all poles
should be connected in fixed wiring.
②The circuit breaker and power cord specification in above sheet is based on max power
(max current) of the unit.
③The power cord specification in above sheet is based on ambient temperature of 40°C.
④The circuit breaker specification in above sheet is based on ambient temperature of 40°C.
If the working condition is different, please adjust it according to the specification sheet of circuit
breaker.
4 Installation Instructions
4.1 Indoor Unit Installation
4.1.1 Ceiling Opening Dimension and Suspension Bolt Position.
Fig 4.1.1

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4.1.2 Suspend the Indoor Unit
(1) Drill bolt holes and install bolts
1) Stick the reference cardboard on the installation position; drill 4 holes according to
the hole site on the cardboard as shown in fig 4.1.2; diameter of drilling hole is according to
the diameter of expansion bolt and the depth is 60-70mm, as shown in fig 4.1.3.
Fig 4.1.2 Fig 4.1.3
2) Insert the M10 expansion bolt into the hole and then knock the nail into the bolt, as
shown in fig 4.1.4.
Note: The length of bolt depends on the installation height of the unit, bolts are field supplied.
Fig 4.1.4
(2) Install the indoor unit temporarily
Assemble suspension bolt on the expansion bolt, attach the hanger bracket to the suspension
bolt. Be sure to fix it securely by using a nut and washer from upper and lower sides of the hanger
bracket. The washer fixing plate will prevent the washer from falling.
(3) The usage of paper pattern
Refer to paper pattern of installation for ceiling opening dimension. The center of ceiling
opening is indicated on the paper pattern. Fix the paper pattern to the unit with 4 screws and fix
the corners of the waterspout at the drainage pipe by screws.
(4) Adjust the unit to the right position.
(5) Check the level of the unit
The indoor unit is equipped with build-in water pump and float switch, verify the levelness of 4
directions by level gauge or vinyl tube (filled with water) respectively.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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(6) Remove the washer locating plate and then tighten the nut on it.
(7) Remove the paper pattern.
Fig 4.1.5
4.2 Refrigerant Pipe Connection
(1) Aim the flaring port of copper pipe at the center of screwed joint and then tighten the
flaring nut with hand as shown in fig 4.2.
(2) Tighten the flaring nut with torque wrench.
Fig.4.2
(3) Use pipe bend when bending the pipe and the bending angle should not be too small.
(4) Wrap the connection pipe and joint with sponge and then tie them firmly with tape.
4.3 Drainage Pipe Installation and Drainage System Testing
4.3.1 Notice for Installation of Drain Pipe
(1) The drainage pipe should be short and the gradient downwards should be at least
1%~2% in order to drain condensation water smoothly.
(2) The diameter of drainage hose should be bigger or equal to the diameter of drainage
pipe joint.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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(3) Install drainage pipe according to the following fig and arrange insulation to the
drainage pipe. Improper installation may lead to water leakage and damp the furniture and
other things in the room.
(4) You can buy normal hard PVC pipe used as the drainage pipe. During connection,
insert the end of PVC pipe into the drainage hole and then tighten it with drainage hole and
wire binder. Can’t connect the drainage hole and drainage hole with glue.
(5) When the drainage pipelines are used for several units, the position of pipeline
should be about 100mm lower than the drainage port of each unit. In this case, thicker pipes
should be applied.
Fig 4.3.1
4.3.2 Drainage Pipe Installation
(1) Drainage pipe should have the same diameter or larger diameter than the connecting
pipes (PVC pipe, outside diameter 25mm, thickness≥1.5mm)
(2) Keep drainage pipe short and sloping downwards at a gradient of at least 1% for
preventing forming air bubbles.
(3) If the gradient of drainage pipe could not meet the installation requirements, raising
pipe should be applied.
(4) Insert the drainage hose into drain socket, tighten the metal clamp securely.
(5) Warp the sealing pad over drain hose and metal clamp for heat insulation.
(6) Make sure to perform insulation work for all drainage piping in order to prevent any
possible water drop due to dew condensation.
(7) Apply the suitable diameter for converging drainage pipe according to the operating
capacity of the unit.
Fig 4.3.2
-drainage pipes assembled by T-shaped joints
(8) The installation height of raising pipe for drainage should be lower than B. The
gradient from raising pipe towards drainage direction should be at least 1%~2%. If the raising
pipe is vertical with the unit, the raising height should be less than C.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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Fig 4.3.3
model
A(mm)
B(mm)
C(mm)
GMV-ND22TD/A-T
GMV-ND28TD/A-T
GMV-ND36TD/A-T
GMV-ND45TD/A-T
GMV-ND50TD/A-T
100
900
850
(9) Drain pipes should have a downward slope of at least 1%~2%, in order to prevent
pipes from sagging, install hanger bracket at intervals of 1000~1500mm.
Fig 4.3.4
4.3.3 Test of Drainage System
(1) Please test drainage system after electric work is finished.
Inject approximately 1L purified water to drain pan from air vent, ensure that not to splash the
water over the electrical components (e.g. water pump. etc.).
1) In case of commissioning finished, please energize the IDUs and switch to cooling or
dry mode, meanwhile, the water pump operates, you can check the draining through the
transparent part of drain socket.
2) If communication wire is not connected, communication malfunction “C0” will occur
after 60s of energizing. In this case, the water pump operates automatically. Check if the
water pump drains normally drains normally through drainage port. The water pump will stop
automatically after running for 10min.
(2) During the test, please carefully check the drainage joint; make sure no any leakage
occur.
(3) It’s strongly recommend to do the drain test before ceiling decoration.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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Fig 4.3.5
4.4 Panel Installation
4.4.1 Notices for Installation
(1) Improper decorative panel installation could cause the following problems.
Fig 4.4.1
(2) Ensure that it’s clearance-free between decoration panels and ceiling board after
installation, if not, please adjust the body position.
Fig 4.4.2
(3) Connect the decoration panel terminals (Female) to body terminals (male) as shown
in figure 4.4.3.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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Fig 4.4.3
4.4.2 Panel Installation
(1) Remove the grille from the panel, and then open the horizontal louver.
(2) Aim the screw hole on panel at the corresponding screw hole on main unit.
(3) Screw up the screws on corresponding holes and then install the corresponding
screw cover.
(4) Close the horizon lover, connect the butt terminal and arrange the wires.
(5) Install the grille.

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4.5 Wired Controller Installation
Wired controller is optional accessory. If wired controller is needed, please contact your local
dealer and install the wired controller according to the instruction manual.
Note:
Do perform the commissioning operation before first use, automatic addressing or other
settings, please refer to the manual of ODU.
5 Wiring Work
Warning!
Before obtaining access to terminals, all supply circuits must be disconnected.
Notes:
①Units must be earthed securely, or it may cause electric shock.
②Please carefully read the wiring diagram before carry out the wiring work, incorrect wiring
could cause malfunction or even damage the unit.
③The unit should be powered by independent circuit and specific socket.
④The wiring should be in accordance with related regulations in order to ensure the units
reliable running.
⑤Install circuit breaker for branch circuit according to related regulations and electrical
standards.
⑥Keep cable away from refrigerant pipings, compressor and fan motor.
⑦The communication wires should be separated from power cord and connection wire
between indoor unit and outdoor unit.
⑧Adjust the static pressure via wired controller according to site circumstance.
5.1 Connection of Wire and Patch Board Terminal
(1) The connection of wire (as shown in fig 5.1.1)
1) Strip about 25mm insulation of the wire end by stripping and cutting tool.
2) Remove the wiring screws on the terminal board.
3) Shape the tail of wire into ring by needle nose plier, and keep the gauge of ring in
accordance with screw.
4) Use the screwdriver for tightening the terminal.
(2) The connection of stranded wire (as shown in fig 5.1.2)
1) Strip about 10mm insulation of the end of stranded wire by stripping and cutting tool.
2) Loosen the wiring screws on terminal board.
3) Insert the wire into the ring tongue terminal and tighten by crimping tool.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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4) Use the screwdriver for tightening the terminal.
Fig 5.1.1 Fig 5.1.2
5.2 Power Cord Connection
Note:
①Every unit should be equipped with a circuit breaker for short-circuit and overload protection.
②During operation, all indoor units connected to the same outdoor unit system must be kept
energized status. Otherwise, the unit can’t operate normally.
Fig 5.2
For units with single-phase power supply.
1) Detach the electric box lid.
2) Let the power cord pass through the wiring through-holes.
3) Connect the power cord to terminal "L, N, “
4) Fix the power card with wiring clamp.
5.3 Connection of Communication Wire between Indoor Unit and Outdoor
Unit (or indoor unit)
(1) Detach the electric box lid.
(2) Let the Communication cable pass through the wiring through-holes.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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(3) Connect the communication wire to terminal D1 and D2 of indoor 4-bit wiring board,
as shown in fig 5.3.1.
Fig 5.3.1 Fig 5.3.2
(4) Fix the communication cable with clamp of electric box.
(5) For more reliable communication, make sure connect the terminal resistor to the
most downstream IDU of the communication bus (terminal D1 and D2), as shown in fig 5.3.2,
terminal resistor is provided with each ODU.
5.4 Connection of Communication Wire for Wired Controller
(1) Detach the electric box lid.
(2) Let the communication wire pass through the wiring through-holes.
(3) Connect the communication wire to terminal H1 and H2 of indoor 4-bit wiring board.
(4) Fix the communication wire with clamp.
(5) Wiring instructions of signal receiver and wired controller:
1) Wired controller (standard) is shown as Fig.5.4.1, wireless controller (optional) is
shown as Fig.5.4.2, signal receiver is provided with panel as standard accessory.
Fig 5.4.1 Fig 5.4.2
2) Both IDU and wired controller are equipped with signal receiver, and available for
wireless control respectively.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
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Fig 5.4.3
5.5 Instructions on Connecting Wired Controller and Indoor Units Network
(1) Communication wire of indoor unit and outdoor unit (or indoor unit) is connected to
D1, D2.
(2) Wired controller is connected to H1, H2.
(3) One indoor unit can connect two wired controllers that must be set as master one
and slave one.
(4) One wired controller can control 16 indoor units in maximum at the same time. (As
shown in fig 5.5)
Notes:
①The type of indoor units must be the same if they are controlled by the same wired
controller.
②When the indoor unit is controlled by two wired controllers, the addresses of the two
wired controllers should be different through address setting. Address 1 is for main controller;
Address 2 is for slave controller. Detailed setting please refer to the instruction manual of wired
controller.