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
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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