Gree NCHS2D User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
GMV6 HR Mode Exchange Box
Models:
NCHS2D
NCHS4D
NCHS8D

To Users
Thank you for selecting Gree’s 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 has gone through strict inspection and operational test before leaving the
factory. In order to avoid damage due to improper disassembly and inspection, which may
impact the normal operation of unit, please do not disassemble the unit by yourself. You can
contact with the special maintenance center of our company if necessary.
(5) When the product is faulted and cannot be operated, please contact with our maintenance
center as soon as possible by providing the following information.
1)Contents of nameplate of product (model, cooling/heating capacity, product No.,
ex-factory date).
2)Malfunction status (specify the situations before and after the error occurs).
(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. We
have the right to make necessary revision to the product from time to time due to the reason
of sales or production, and reserve the right to revise the contents without further notice.
(7) The final right to interpret for this instruction manual belongs to Gree Electric Appliances Inc.
of Zhuhai.

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 Main Parts ························································································4
2.2 Parameter Table······························································································5
3 Preparation before Installation ········································································ 5
3.1 Standard Accessory ·························································································5
3.2 Installation Site································································································6
3.3 Selection Requirement for Communication Wire ·····················································7
3.4 Wiring Requirement ·························································································8
4 Installation Instruction ··················································································· 9
4.1 Installation of Mode Exchange Box ······································································9
4.2 Pipe Connection···························································································· 14
4.3 Installation and Test for Drainage Hose······························································· 24
5 Cable Connection······················································································· 27
5.1 Connection of Cable and Terminal of Wiring Board················································ 28
5.2 Connect Power Cord ······················································································ 29
5.3 Connect Communication Wire of Indoor Unit and Outdoor Unit ································ 30
6 Routine Maintenance ·················································································· 32
6.1 Notice before Seasonal Use············································································· 32
6.2 Maintenance after Seasonal Use······································································· 32
7 Troubleshooting ························································································· 33

GMV6 HR Mode Exchange Box
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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.
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 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 ~50/60Hz, 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.
The design pressure is 4.3 MPa. The thickness of pipe for installation should comply with
the relevant national/continental regulations.
Do not connect the indoor unit and hot water generator at the same time under the same
branch of the mode converter, otherwise the unit will be damaged.
After the power cord is installed, please note to ensure that the power cord should not
direct touch the sheet metal of electric box.
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.

GMV6 HR Mode Exchange Box
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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).

GMV6 HR Mode Exchange Box
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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°C.
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.
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.
Gree Electric Appliances, Inc. of Zhuhai will not assume responsibility for any personal injury or property loss
caused by improper installation, improper debugging, unnecessary repair or not following the instructions of this
manual.
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
This marking indicates that this product should not be disposed with other
household wastes throughout the EU. To prev
ent 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.

GMV6 HR Mode Exchange Box
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2 Product Introduction
2.1 Names of Main Parts
One-to-two Mode Exchange Box:
Fig.2.1.1
One-to-four Mode Exchange Box:
Fig.2.1.2
One-to-eight Mode Exchange Box:
Fig.2.1.3

GMV6 HR Mode Exchange Box
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2.2 Parameter Table
Model Unit NCHS2D NCHS4D NCHS8D
Rated voltage V,Hz 220-240V ~50/60Hz
Max. quantity of connecting indoor unit - 16 32 64
Max. branch quantity of connecting indoor
unit
- 2 4 8
Max. quantity of connecting indoor unit for
each branch
- 8 8 8
Max. total capacity of connecting indoor
unit for each branch
kW 16 16 16
Total capacity of connecting indoor unit for
mode convertor
kW 28 45 68
Size of high pressure pipe (mode
convertor connects outdoor unit) mm 19.05 22.2 22.2
Size of low pressure gas pipe (mode
convertor connects outdoor unit) mm 22.2 28.6 28.6
Size of liquid pipe (mode convertor
connects outdoor unit) mm 9.52 12.7 15.9
Size of gas pipe (mode convertor
connects indoor unit) mm 15.9/12.7 15.9/12.7 15.9/12.7
Size of liquid pipe (mode convertor
connects indoor unit) mm 9.52/6.35 9.52/6.35 9.52/6.35
3 Preparation before Installation
NOTE!
The product photos are only for reference. The unit for size is mm, except otherwise stated.
3.1 Standard Accessory
Please use below provided standard parts according to requirement.
No. Name Photo Quantity Purpose
1 M10×8
Nut with washer M10×8 4 Used for hanging Mode
Exchange Box.
2 Nut M10
(hexagon nut M10×8.4) 4 Used for hanging Mode
Exchange Box.
3 Washer 10
(spring washer M10×2.6) 4 Used for hanging Mode
Exchange Box.
4 Sponge of drainage pipe 2 Wrap the connection
position of drainage pipe.
5 High-tenperature tieline 11 Wrap sponges at the
connection position.
6 Installation template — 1 Used for drilling holes at the
ceiling.
7 Silencer 1 1
The sizes of both nozzles
are IDΦ19.3mm and
Φ19.05mm， nozzle Φ19 mm
is used for connecting the
high pressure gas pipe of
NCHS2D.

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No. Name Photo Quantity Purpose
8 Silencer 2 1
The sizes of both nozzles
are IDΦ22.6mm and
Φ22.2mm, nozzle Φ28mm
is used for connecting the
low pressure gas pipe of
NCHS2D.
9 Silencer 1 1
The sizes of both nozzles
are IDΦ22.6mm and
Φ22.2mm, nozzle Φ22 mm
is used for connecting the
high pressure gas pipe of
NCHS4D and NCHS8D.
10 Silencer 2 1
The sizes of both nozzles
are IDΦ28.8mm and
Φ28.6mm, nozzle Φ28mm
is used for connecting the
low pressure gas pipe of
NCHS4D and NCHS8D.
11 Sealing cap 1 Used for blocking the low
pressure gas pipe nozzle.
The packed attachments should be subject to actual objects. If there are any alterations, there
will be no further notice.
3.2 Installation Site
(1) Make sure the hanging parts can hold the weight of unit.
(2) Water can be drained out from the drainage hose conveniently.
(3) No obstacles at outlet and inlets. Keep the air ventilation in good condition.
(4) Connect either left or right side of converter to outdoor unit for piping according to installation
space, as shown in the Fig.3.2.1, the space used for maintenance should be ensured.
(5) Please keep the unit away from those positions where there’s thermal source, inflammable
gas and smog.
(6) The unit is the cassette type (concealed type).
(7) Indoor unit, outdoor unit, Mode Exchange Box power cord and connection cord should be
kept 1m above away from TV and radio for preventing graphic interference and noise. (Even
the distance is 1m, if there’s strong electric wave, there’s still noise).
Unit：mm
Fig.3.2.1