Gree GMV-ND45T/A-T User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Multi Variable Air Conditioners
Cassette Type Indoor Unit
Models:
GMV-ND28T/A-T GMV-ND36T/A-T
GMV-ND45T/A-T GMV-ND50T/A-T
GMV-ND56T/A-T GMV-ND63T/A-T
GMV-ND71T/A-T GMV-ND80T/A-T
GMV-ND90T/A-T GMV-ND100T/A-T
GMV-ND112T/A-T GMV-ND125T/A-T
GMV-ND140T/A-T GMV-ND160T/A-T

To Users
Thank you for selecting Gree 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 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.
(5) If the product needs to be installed, moved or maintained, please contact our designated dealer
or local service center for professional support. Users should not disassemble or maintain the
unit by themselves, otherwise it may cause relative damage, and our company will bear no
responsibilities.
(6) 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. If there is
adjustment in the product, please subject to actual product.

Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss is caused by the
following reasons:
(1) Damage the product due to improper use or misuse of the product.
(2) Alter, change, maintain or use the product with other equipment without abiding by the
instruction manual of manufacturer.
(3) After verification, the defect of product is directly caused by corrosive gas.
(4) After verification, defects are due to improper operation during transportation of product.
(5) Operate, repair, maintain the unit without abiding by instruction manual or related regulations.
(6) After verification, the problem or dispute is caused by the quality specification or performance of
parts and components that produced by other manufacturers.
(7) The damage is caused by natural calamities, bad using environment or force majeure.

Contents
1 Safety Notices (Please be sure to abide) ......................................................................1
2 Product Introduction ......................................................................................................4
2.1 Names of Key Components..................................................................................................... 4
2.2 Rated Working Condition......................................................................................................... 4
3 Preparations for Installation ..........................................................................................4
3.1 Standard Fittings...................................................................................................................... 4
3.2 Installation Position Selection.................................................................................................. 5
3.3 Requirements of Communication Wire Selection .................................................................... 6
3.4 Wiring Requirement................................................................................................................. 7
4 Installation Instructions .................................................................................................8
4.1 Indoor Unit Installation............................................................................................................. 8
4.2 Refrigerant Pipe Connection ..................................................................................................11
4.3 Drainage Pipe Installation and Drainage System Testing...................................................... 12
4.4 Panel Installation ................................................................................................................... 15
4.5 Wired Controller Installation .................................................................................................. 16
5 Wiring Work...................................................................................................................17
5.1 Connection of Wire and Patch Board Terminal...................................................................... 17
5.2 Power Cord Connection ........................................................................................................ 18
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit (or indoor unit) 18
5.4 Connection of Communication Wire for Wired Controller...................................................... 19
5.5 Instructions on Connecting Wired Controller and Indoor Units Network ............................... 19
6 Routine Maintenance....................................................................................................21
6.1 Cleaning of Filter ................................................................................................................... 21
6.2 Maintenance Before The Seasonal Use................................................................................ 21
6.3 Maintenance After The Seasonal Use ................................................................................... 21
7 Table of Error Codes for Indoor Unit...........................................................................22
8 Troubleshooting............................................................................................................22

Multi Variable Air Conditioners Cassette Type Indoor Unit
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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.
This Multi VRF System shall only be connected to an appliance suitable for the same
refrigerant.
All units in Manual Cover is a partial unit, complying with partial unit of IEC
60335-2-40:2018, and must only be connected to other units that have been confirmed as
complying to corresponding partial unit requirements of this international standard.
The electrical interface shall comply with electrical security requirement, voltage shall be
220-240V~50Hz or 208-230V~60Hz, current shall be referred to the table of “Dimension of
power cord and capacity of air switch” in Section 3.4, and safety class of construction is I.
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 dealer or
qualified technicians. Do not
install the product by yourself.
Improper installation may result
in water leakage, electric shock
or fire hazard.
Make sure the local power
supply is in accordance with
units before installation, and
check the power supply
carefully.
This air conditioner must be
properly grounded through the
receptacle to avoid electric
shock. The grounding wire
shouldn't be connected with
gas pipe, water pipe, lightning
arrester or telephone line.
Please use specialized
accessories or parts to carry
out installation, or water
leakage, electric shock, fire
hazard may resulted.
R410A refrigerant can produce
poisonous gas once it meets
fire, so please ventilate the
room immediately if refrigerant
leaks out during installation.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Diameter of power cord must
be large enough. Damaged
power cord and 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
in case the unit may be
damaged.
For units with wired controller,
do not connect power supply
until the wired controller is well
installed. Otherwise, the wired
controller cannot be used.
When the installation is
finished, please check and
make sure the drain pipe,
pipeline and electric wire are all
well connected in order to
avoid water leakage,
refrigerant leakage, electric
shock or fire hazard.
Do not extend fingers or
objects into air outlet or air
return grille.
If you use gas heater or
petroleum heater in the same
room, please open the door or
window to maintain good air
circulation in case the room
may 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 the unit 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 to water or
place it in a damp or corrosive
environment.
Connect power supply 8 hours
before operation. Do not
disconnect power if you want to
stop the unit in a short period of
time, e.g. in one night (This is
for protecting the compressor).

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Volatile liquid like thinner or
gasoline will damage the
appearance of air conditioner.
Please use soft dry cloth or wet
cloth with mild detergent to
clean the outer case of air
conditioner.
During Cooling mode, indoor
temperature should not be set
too low. Keep the difference
between indoor temp and
outdoor temp within 5℃.
If abnormal condition occurs
(e.g. unpleasant smell), please
turn off the unit at once and
disconnect power supply. Then
contact GREE service center. If
the air conditioner continues to
operate despite of abnormal
condition, the unit may be
damaged and it may 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 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.
Correct Disposal of this product
T
his marking indicates that this product should not be disposed with other
household wastes throughout the EU. To prevent possible harm to the environment
or human health from uncontrolled waste disposal, recycle it responsibly to promote
the sustainable reuse of material resources. To return your used device, please use
the return and collection systems or contact the retailer where the product was
purchased. They can take this product for environmental safe recycling.

Multi Variable Air Conditioners Cassette Type Indoor Unit
4
2 Product Introduction
2.1 Names of Key Components
Fig.2.1
No.
①②③④⑤⑥
Name
Air Outlet
Filter
Air Inlet Grille
Fittings
Louver
Drainage Pipe
2.2 Rated Working Condition
-
Indoor Side Condition
Outdoor Side Condition
Dry Bulb Temp (°C)
Wet Bulb Temp (°C)
Dry Bulb Temp (°C)
Wet Bulb Temp (°C)
Rated Cooling
27
19
35
24
Rated Heating
20
15
7
6
3 Preparations for Installation
NOTE! This picture is for reference only, please refers 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 set 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.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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No.
Name
Appearance
Q'ty
Usage
5 Drain Hose Assembly 1 To connect with the hard PVC drain
pipe.
6 Special Nut
2 GMV-ND28~50T/A-T.
1 GMV-ND56~160T/A-T.
7
Corrugated pipe
1
GMV-ND56~160T/A-T.
8 M10 Washer 10 To be used together with the
hanger bolt for installing the unit.
9 Insulation 1 To insulate the gas pipe.
10 Insulation 1 To insulate the liquid pipe.
11 Sponge 4 To insulate the drain pipe.
12
Fastener
4
To fasten the sponge.
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

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Unit:mm
Model
H
GMV-ND28~50T/A-T 220
GMV-ND56~80T/A-T
270
GMV-ND90~140T/A-T
350
GMV-ND160T/A-T
310
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.
④The appliances are not accessible to general public.
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.
3.3.1 Selection of Communication Wire Between Indoor Unit and Wired Controller
Fig.3.3.1
Wire type
Total length of
communication wire b
etween
indoor unit and wired
controller (m)
Wire diameter
(mm²) Wire standard Remark
Light/normal PVC
hose L≤250 2×0.75
~2×1.25
IEC
60227-5
1. Total length of communication
line can't exceed 250m.
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.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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3.3.2 Selection of Communication Wire Between Indoor Unit and Indoor Unit (or outdoor
unit)
Fig.3.3.2
Wire type
Tota
l length of communication
wire between indoor unit and
indoor unit(outdoor unit) (m)
Wire diameter
(mm²)
Wire
standard Remark
Light/normal PVC
hose L≤1000 ≥2×0.75 IEC
60227-5
1. If the wire diameter is enlarged to
2×1mm², the total communication
length line can reach 1500m.
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.
3.4 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-ND28T/A-T
220-240V-1ph-50Hz
208-230V-1ph-60Hz
6
1.0
1.0
GMV-ND36T/A-T
6
1.0
1.0
GMV-ND45T/A-T
6
1.0
1.0
GMV-ND50T/A-T 6 1.0 1.0
GMV-ND56T/A-T
6
1.0
1.0
GMV-ND63T/A-T
6
1.0
1.0
GMV-ND71T/A-T
6
1.0
1.0
GMV-ND80T/A-T
6
1.0
1.0
GMV-ND90T/A-T
6
1.0
1.0
GMV-ND100T/A-T
6
1.0
1.0
GMV-ND112T/A-T
6
1.0
1.0
GMV-ND125T/A-T
6
1.0
1.0
GMV-ND140T/A-T
6
1.0
1.0
GMV-ND160T/A-T 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℃.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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④If 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.
⑤The 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
Unit: mm
Model
A
GMV-ND28~140T/A-T
950

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Fig.4.1.2
Unit: mm
Model
A
B
C
GMV-ND160T/A-T
1040
790
840
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.4.1.3.diameter of drilling hole is according to the
diameter of expansion bolt and the depth is 60-70mm, as shown in Fig.4.1.4.
Fig.4.1.3Fig.4.1.4
2) Insert the M10 expansion bolt into the hole and then knock the nail into the bolt, as shown in
Fig.4.1.5.
NOTE! The length of bolt depends on the installation height of the unit, bolts are field supplied.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Fig.4.1.5
(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.
(6) Remove the washer locating plate and then tighten the nut on it.
(7) Remove the paper pattern.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Fig.4.1.6
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

Multi Variable Air Conditioners Cassette Type Indoor Unit
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Torque for tightening nut
Pipe diameter (mm) Torque (N·m)
Φ6.35
15~30
Φ9.52
35~40
Φ12.7
45~50
Φ15.9
60~65
Φ19.05
70~75
(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) It is not allowed to connect the condensate drain pipe into waste pipe or other pipelines which
are likely to produce corrosive or peculiar smell to prevent the smell from entering indoors or
corrupt the unit.
(2) It is not allowed to connect the condensate drain pipe into rain pipe to prevent rain water from
pouring in and cause property loss or personal injury.
(3) Condensate drain pipe should be connected into special drain system for air conditioner.
(4) The drainage pipe should be short and the gradient downwards should be at least 1%~2% in
order to drain condensation water smoothly.
(5) The diameter of drainage hose should be bigger or equal to the diameter of drainage pipe joint.
(6) 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.
(7) 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.
(8) 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.

Multi Variable Air Conditioners Cassette Type Indoor Unit
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(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
①Drainage 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, as shown in Fig.4.3.3.
Fig.4.3.3
Unit:mm
Model
A
B
C
GMV-ND28~50T/A-T 170 1030 980
GMV-ND56~160T/A-T
220
980
930
(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.
Unit:mm
Fig.4.3.4

Multi Variable Air Conditioners Cassette Type Indoor Unit
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(10) During the installation, distance from soft drain pipe to the gasket is C when the bolt is tightened.
It is not allowed to apply PVC or other related glue in the joints of two ends of drain pipe.
Fig.4.3.5
Unit:mm
Model
C
GMV-ND28~50T/A-T
10±3
GMV-ND56~160T/A-T
15±3
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.
Fig.4.3.6

Multi Variable Air Conditioners Cassette Type Indoor Unit
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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 its clearance-free between decoration panel 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 Fig.4.4.3.
Fig.4.4.3

Multi Variable Air Conditioners Cassette Type Indoor Unit
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4.4.2 Panel Installation
(1) Detach the panel’s Corner Cap, there is a mark “piping side” on one of the 4 corners, adjust the
panel direction so as to keep the mark and fittings on the same corner.
(2) Temporality hang the panel to body (there is four hangers on each corner of the panel, hang the
hangers to corresponding hooks on the body), as shown in Fig.4.4.4.
(3) Detach the air inlet grille from panel, make a wiring connection of signal receiver. Notices that the
connection wire not stuck in the middle of body and panel, or may cause air leakage and lead to
condensation water drop.
(4) Tighten 4 screws at each corner of panel respectively, fix the panel on the body firmly.
(5) After tightening screws, reinstall the air inlet grille.
Fig.4.4.4
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.