Gree GMV-ND28TD/A-T User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Multi Variable Air Conditioners
One-way Cassette Type Indoor Unit
Models:
GMV-ND22TD/A-T
GMV-ND28TD/A-T
GMV-ND36TD/A-T
GMV-ND45TD/A-T
GMV-ND50TD/A-T
GMV-ND56TD/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 ................................................................................................. 10
4.3 Drainage Pipe Installation and Drainage System Testing...................................................... 10
4.4 Panel Installation ................................................................................................................... 13
4.5 Wired Controller Installation .................................................................................................. 15
5 Wiring Work...................................................................................................................15
5.1 Connection of Wire and Patch Board Terminal...................................................................... 16
5.2 Power Cord Connection ........................................................................................................ 16
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit (or Indoor Unit) 17
5.4 Connection of Communication Wire for Wired Controller...................................................... 18
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 One-way Cassette Type Indoor Unit
1
1 Safety Notices (Please be Sure to Abide)
WARNING: If not abide strictly, it may cause severe damage to the unit or the people.
NOTICE: 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 isⅠ.
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 One-way Cassette Type Indoor Unit
2
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 One-way Cassette Type Indoor Unit
3
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 our
designated dealer or local
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 our designated dealer or
local service center and have it
repaired by professional technicians.
Install units according to national wiring codes.
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.
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.
If the product needs to be installed, moved or maintained, please contact our designated dealer or
local service center for professional support, otherwise out company would bear no legal reliability for
the related damages arising therefrom.
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.
Correct Disposal of this product
This 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 One-way Cassette Type Indoor Unit
4
2 Product Introduction
2.1 Names of Key Components
Fig.2.1
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 19 35 24
Rated Heating 20 15 7 6
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
2 GMV-ND22~50TD/A-T
1 GMV-ND56TD/A-T
7 Corrugated pipe 1 GMV-ND56TD/A-T

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
5
No. Name Appearance Q'ty Usage
8 M10 Washer 10 To be used together with the
hanger bolt for installing the unit.
9 Tapping screw 10 To be used connect the panel to
the main body.
10 Insulation 1 To insulate the gas pipe
11 Insulation 1 To insulate the liquid pipe
12 Sponge 4 To insulate the drain pipe
13
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
Models: H(mm)
GMV-ND22~56TD/A-T
207
NOTES!
①The unit shall be installed in accordance with national standards or local regulations.
②Only qualified personnel can carry out installation work, please contact our designated dealer
or local service center before installation.
③Make sure all the installation work completed before energizing.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
6
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
Material type
Total length of
communication line
between indoor unit and
wired controller L (m)
Wire size (mm²)Material
Standard Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
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.
3.3.2 Selection of Communication Wire between Indoor Unit and Indoor Unit (or Outdoor
Unit)
Fig.3.3.2

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
7
Material Type
Total Length L (m) of
Communication Cable
between Indoor Unit
and Indoor (Outdoor)
Unit
Wire size (mm²)
Material
Standard Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
L≤1000 ≥2×0.75 IEC 60227-5
1.
If the wire diameter is enlarged to
2×1mm², the total communication line
length 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-ND22TD/A-T
GMV-ND28TD/A-T
GMV-ND36TD/A-T
GMV-ND45TD/A-T
GMV-ND50TD/A-T
GMV-ND56TD/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℃.
④The circuit breaker specification in above sheet is based on ambient temperature of 40℃. If the
working condition is different, please adjust it according to the specification sheet of circuit
breaker.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
8
4 Installation Instructions
4.1 Indoor Unit Installation
4.1.1 Ceiling Opening Dimension and Suspension Bolt Position.
Unit:mm
Fig.4.1.1
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.
Unit:mm
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

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
9
(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.
Fig.4.1.5

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
10
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
Pipe diameter(mm)
Torque(N•m)
6.35
15~30
9.52 35~40
12.7
45~50
15.9
60~65
(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.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
11
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.
Unit: mm
Fig.4.3.2
(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
12
Unit: mm
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
GMV-ND56TD/A-T
110 1090 1040
(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
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.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
13
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 recommended to do the drain test before ceiling decoration.
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

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
14
(3) Connect the decoration panel terminals (Female) to body terminals (male) as shown in
Fig.4.4.3.
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.
Unit:mm
Fig.4.4.4

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
15
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!
(1) Units must be earthed securely, or it may cause electric shock.
(2) Please carefully read the wiring diagram before carry out the wiring work, incorrect wiring could
cause malfunction or even damage the unit.
(3) The unit should be powered by independent circuit and specific socket.
(4) The capacity of power supply must be sufficient and the sectional area of wires in the room
should be above
(5) The wiring should be in accordance with related regulations in order to ensure the units reliable
running.
(6) Install circuit breaker for branch circuit according to related regulations and electrical standards.
(7) All wiring must use pressure terminal or single wire. Multi-twisted wire that connects directly to
the wiring board may cause fire hazard.
(8) Keep cable away from refrigerant pipings, compressor and fan motor.
(9) Do not change the internal wiring of the air conditioner; otherwise, our company will not bear
relevant legal responsibilities for the related damages.
(10) If the unit is installed in places with strong electromagnetic interference, it's recommended to
use twin-twisted shield wire. During wire connection, please pay attention that the metal shield
layer of the twin-twisted wire must be grounded (outer case) in order to prevent the unit from
electromagnetic interference.
(11) The communication wires should be separated from power cord and connection wire between
indoor unit and outdoor unit.
(12) The electric wire can’t be expanded by connecting another electric wire. When the length of the
electric wire is not enough, please contact our designated dealer or local service center for a
special electric wire.

Multi Variable Air Conditioners One-way Cassette Type Indoor Unit
16
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.
4)Use the screwdriver for tightening the terminal.
Unit:mm
Fig.5.1.1 Fig.5.1.2
5.2 Power Cord Connection
NOTES!
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.