Gree GMV-ND28ZD/B-T User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Multi Variable Air Conditioners
Floor Ceiling Type Indoor Unit
Models:
GMV-ND28ZD/B-T
GMV-ND36ZD/B-T
GMV-ND50ZD/B-T
GMV-ND56ZD/B-T
GMV-ND63ZD/B-T
GMV-ND71ZD/B-T
GMV-ND90ZD/B-T
GMV-ND112ZD/B-T
GMV-ND125ZD/B-T
GMV-ND140ZD/B-T
GMV-ND160ZD/B-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) 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.
(4) 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.
(5) Please properly select the model according to actual using environment; otherwise it
may impact the using convenience.
(6) 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.
(7) All the illustrations and information in the instruction manual are only for reference. In
order to make the product better, we will continuously conduct improvement and
innovation. 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 ............................................................................................ 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 .....................................................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 ....................................... 11
4.4 Wired Controller Installation ...................................................................................15
5 Wiring Work ....................................................................................................... 15
5.1 Connection of Wire and Patch Board Terminal .......................................................15
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........................................17
5.5 Wiring Instructions of Wired Controller and Indoor Units Network .......................... 18
6 Routine Maintenance......................................................................................... 20
6.1 Maintenance before the Seasonal Use...................................................................20
6.2 Maintenance after the Seasonal Use .....................................................................20
7 Table of Error Codes for Indoor Unit .................................................................. 21
8 Troubleshooting ................................................................................................. 22

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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1 Safety Notices (Please be sure to abide)
WARNING: If not abide them strictly, it may cause severe damage to the unit or the
people.
NOTICE: If not abide them strictly, it may cause slight or medium damage to the unit or
the people.
This sign indicates that the items 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 the above
special places, please adopt special air conditioner with anti-corrosive or anti-explosion function.
Follow this manual to complete
the installation work. Please
read this manual carefully
before turning on or repairing
the unit.
Installation should be
conducted by the dealer or
qualified personnel. Please
do not attempt to install the
air conditioner by yourself.
Improper installation may
lead to water leakage,
electric shock or fire hazard,
etc.
Before installation, please
check whether the power
supply is complied with that
specified on the nameplate and
check the safety of the power
supply.
The air conditioner must be
grounded reliably for
avoiding electric shock.
Please do not connect the
earthing wire to gas pipe,
water pipe, lightning rod or
telephone line.
Be sure to use special
accessories and parts for
installation to prevent water
leakage, electric shock and fire
hazard, etc.
If refrigerant leakage
happens, please ventilate
the room immediately.
Diameter of power cord should
be large enough. The damaged
power cord and connection wire
must be replaced with special
cables.
When the power cord is
connected, please fix the
electric box cover properly to
avoid safety accidents.
Never fail to comply with the
nitrogen-charging welding
process. Do charge nitrogen
when welding the pipes.
Never short circuit or cancel
the pressure switch to
prevent unit damage.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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As for the unit controlled by the
wired controller, connect the
wired controller well firstly and
then energize the unit;
otherwise, the unit can’t
operate normally.
When installation is finished,
please check whether the
drainage pipes, pipelines
and electric wires are
connected correctly to avoid
water leakage, refrigerant
leakage, electric shock or
fire, etc.
Do not insert fingers or objects
into air outlet or air return grille.
Open the door and window
frequently to keep good
ventilation for avoiding
oxygen deficit when gas
heater or oil heater is used in
the room.
Never plug in or unplug the
power plug directly to turn on or
turn off the air conditioner.
Once the air conditioner is
turned on, it can be turned
off only after it has operated
for 5min at least; otherwise,
it will affect the oil return of
compressor.
Do not allow children to operate
this air conditioner. Do not operate this air conditioner with wet hands.
The air conditioner can be
cleaned only when it has been
turned off and the power has
been cut off; otherwise, it may
cause electric shock or injury.
Never spray or flush water
towards the air conditioner;
otherwise, malfunction or
electric shock may happen.
Do not expose the air
conditioner to the moist or
corrosive environment.
Put through the power 8
hours in advance before
operation. Do not cut off the
power when the air
conditioner stops operation
for only about one night
(protect the compressor).
Volatile liquid, such as diluent
or gasoline, will damage the
appearance of air conditioner.
Only soft dry cloth and wet
cloth dipped with neutral
detergent can be used to clean
the outer case of air
conditioner.
Under cooling mode, please
don't set the room
temperature too low; keep
the temperature difference
between indoor and outdoor
within 5°C (41°F).
If there are any abnormal
circumstances (such as burning
smell, etc.), please turn off the
unit and cut off the main power
supply immediately, and then
contact Gree appointed service
center. If those abnormal
circumstances still exit, the unit
may be damaged and it may
lead to electric shock or fire
hazard.
Do not repair the unit by
yourself. Wrong
maintenance may cause
electric shock or fire hazard.
Please contact Gree
appointed service center for
help.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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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.
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, 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.
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.
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

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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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 Remote
Controller 1+2 To control the indoor unit
2 Special Nut
2 GMV-ND28~140ZD/B-T
1 GMV-ND160ZD/B-T
3 Corrugated Pipe 1 GMV-ND160ZD/B-T
4 M10×8 Nut with
Washer 8
To be used together with the
suspension bolt for installing the
unit.
5 Insulation 2 To insulate the gas/liquid pipe
6 Paper Pattern for
Installation — 1 Locate the drill hole on ceiling or
wall
7 Fastener 4 To fasten the sponge

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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3.2 Installation Position Selection
(1) The location should be able to withstand the weight of unit.
(2) The water can be drained conveniently from drainage pipe.
(3) There should be no obstruction near air inlet and air outlet.
(4) Follow the installation distance required in the Fig.3.2 below to ensure sufficient space
for maintenance.
(5) The installation location should be far from heat sources, flammable or explosive gas,
or smog spread in the air.
(6) 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 ensured, there may be noise if the electric wave is too strong.)
Unit: mm
Floor type
Ceiling type
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.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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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 Select Communication Line for 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≤250m 2×0.75~2×1.2
5
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 Select Communication Line for Indoor Unit and Outdoor Unit
Fig.3.3.2

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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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≤1000m ≥2×0.75 IEC 60227-5
1. If the wire diameter is enlarged to
2×1 mm2, 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
Notes:
①The circuit breaker and power cord specification in above sheet are based on max
power (max current) of the unit.
②The power cord specification in above sheet is based on ambient temperature of 40°C.
③The 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.
Dimension of power cord and capacity of air switch:
Models Power Specification
Air Switch
Capacity
(A)
Minimum Sectional
Area of Grounding
Wire(mm2)
Minimum
Sectional Area of
Power Cord (mm2)
GMV-ND28ZD/B-T
220-240V-1ph-
50Hz
208-230V-1ph-
60Hz
6 1 1
GMV-ND36ZD/B-T 6 1 1
GMV-ND50ZD/B-T 6 1 1
GMV-ND56ZD/B-T 6 1 1
GMV-ND63ZD/B-T 6 1 1
GMV-ND71ZD/B-T 6 1 1
GMV-ND90ZD/B-T 6 1 1
GMV-ND112ZD/B-T 6 1 1
GMV-ND125ZD/B-T 6 1 1
GMV-ND140ZD/B-T 6 1 1
GMV-ND160ZD/B-T 6 1 1

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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4 Installation Instructions
4.1 Indoor Unit Installation
4.1.1 Indoor Unit Dimension and Suspension Bolt Position
Fig.4.1.1
Below are dimensions of A, B, C, etc. for different models:
Models A
(mm)
B
(mm)
C
(mm)
D
(mm)
E
(mm)
Drainage
pipe(Outer
Diameter ×
wall thickness)
(mm)
Outer diameter of
connection pipe(mm)
Liquid
pipe Gas pipe
GMV-ND28ZD/B-T
870 235 812 280 665
Ф17×1.75
6.35 9.52
GMV-ND36ZD/B-T
GMV-ND50ZD/B-T 6.35 12.7
GMV-ND56ZD/B-T 9.52 15.9
GMV-ND63ZD/B-T
GMV-ND71ZD/B-T
GMV-ND90ZD/B-T
1200 235 1142 280 665 9.52 15.9
GMV-ND112ZD/B-T
GMV-ND125ZD/B-T
GMV-ND140ZD/B-T 1570 235 1512 280 665
9.52 15.9
GMV-ND160ZD/B-T 9.52 19.05
Important: The drilling work must be carried out by qualified personnel.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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4.1.2 Suspend the Indoor Unit
(1) Determine the location of the hanger through the paper template, and then remove the
paper template, as shown in Fig.4.1.2.1 left.
Fig.4.1.2.1
(2) Insert the anchor bolts into the drilled holes, and drive the pins completely into the
anchor bolts with a hammer, as shown in Fig.4.1.2.1 right.
(3) Remove the right and left side panels, as shown in Fig.4.1.2.2.
(4) Put the hanger bolt into the clasp of the indoor unit and tighten screws on the hanger
to prevent the indoor unit from moving, as shown in Fig.4.1.2.3.
(5) Reinstall and tighten the right and left side panels, as shown in Fig.4.1.2.3.
(6) Adjust the height of the unit to make the drain pipe slant slightly downward so that the
drainage will become much smoother, as shown in Fig.4.1.2.3.
(7) Reinstall and tighten the right and left side panel.
(8) When installing the floor ceiling type unit, if user adjust the horizontal blade with hand,
the angle of horizontal blade should be adjusted as the same direction, as shown in
Fig.4.1.2.4.
Floor type
Fig.4.1.2.2

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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Ceiling type
Unit: mm
Fig.4.1.2.3
Fig.4.1.2.4
4.1.3 Leveling
The water level test must be done after installing the indoor unit to make the unit is
horizontal, as shown in Fig.4.1.3.
Note: Adjust the height of the unit to make the drain pipe slant slightly downward so that
the drainage will become much smoother.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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Fig.4.1.3
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
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 bender 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 Drainage 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.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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(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.4.3.1.1 and arrange insulation tow
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 hose
and wire binder. Never connect the drainage hole and drainage hose 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.4.3.1.1
(9) Connect the drainage pipe properly, as shown in Fig.4.3.1.2.
Fig.4.3.1.2
4.3.2 Drainage Pipe Installation
(1) Drainage pipe should have the same diameter or larger diameter than the connection
pipes (PVC pipe, outside diameter 17mm, thickness≥1.75mm).
(2) Keep drainage pipe short and sloping downwards at a gradient of at least 1% for
preventing forming air bubbles.
(3) Insert the drainage hose into drain socket, tighten the metal clamp securely.
(4) Warp the sealing pad over drain hose and metal clamp for heat insulation.
(5) Make sure to perform insulation work for all drainage piping in order to prevent any
possible water drop due to dew condensation.
(6) Apply the suitable diameter for converging drainage pipe according to the operating
capacity of the unit, as shown in Fig.4.3.2.1.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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Unit: mm
Fig.4.3.2.1
(7) The horizontal pipe can’t be connected to vertical pipe in the same level; please select
the connection way as shown in following figure.
No.1: Three-way connection of drainage pipe joints (Fig.4.3.2.2).
No.2: Connection of downspout elbow (Fig.4.3.2.3).
No.3: Inserting horizontal pipe connection (Fig.4.3.2.4).
Fig.4.3.2.2 Fig.4.3.2.3 Fig.4.3.2.4
(8) 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.4.3.2.5
(9) Prepare the local piping at the connection point for the drain pipe, as shown in the
installation drawings.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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Fig.4.3.2.6
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.).
(2) During the test, please carefully check the drainage joint and make sure no any leakage
occur.
(3) It’s strongly recommended to do the drain test before ceiling decoration.
Ceiling type
Fig.4.3.3.1
Floor type
Fig.4.3.3.2

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4.4 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
Notes:
①Units must be grounded 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 capacity of power supply must be sufficient and the sectional area of wires in the
room should be above 2.5 mm2.
④The unit should be powered by independent circuit and specific socket.
⑤The wiring should be in accordance with related regulations in order to ensure the units
reliable running.
⑥Install circuit breaker for branch circuit according to related regulations and electrical
standards.
⑦Crimp terminal or single wire must be applied for all wires.
⑧Keep cable away from refrigerant piping, compressor and fan motor.
⑨Do not change the wiring inside the unit.
⑩If there is strong electromagnetic interference around the unit, shielded twisted pair line
should be applied; the metal shielded layer of twisted pair wire must be grounded to
avoid electromagnetic interference.
⑪The communication wires should be separated from power cord and connection wire
between indoor unit and outdoor unit.
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 patch 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 patch board.
3)Insert the wire into the ring tongue terminal and tighten by crimping tool.

Multi Variable Air Conditioners Floor and Ceiling Type Indoor Unit
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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.
Fig.5.2
(1) Detach the electric box lid.
(2) Let the power cord pass through the wiring through-holes.
(3) Connect wires according to Fig. 5.2.
(4) Fix the power cord with wiring clamp.