Gree NCHS1D User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
GMV6 HR Mode Exchange Box
Models:
NCHS1D
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 ········································································ 6
3.1 Standard Accessory ·························································································6
3.2 Installation Site································································································7
3.3 Selection Requirement for Communication Wire ·····················································7
3.4 Wiring Requirement ·························································································9
4 Installation Instruction ················································································· 10
4.1 Installation of Mode Exchange Box ···································································· 10
4.2 Pipe Connection···························································································· 15
4.3 Installation and Test for Drainage Hose······························································· 25
5 Cable Connection······················································································· 28
5.1 Connection of Cable and Terminal of Wiring Board················································ 29
5.2 Connect Power Cord ······················································································ 30
5.3 Connect Communication Wire of Indoor Unit and Outdoor Unit ································ 32
6 Routine Maintenance ·················································································· 33
6.1 Notice before Seasonal Use············································································· 34
6.2 Maintenance after Seasonal Use······································································· 34
7 Troubleshooting ························································································· 34

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.

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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.
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.

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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).
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 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.

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

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One-to-eight Mode Exchange Box:
Fig.2.1.4
2.2 Parameter Table
Model NCHS1D NCHS2D NCHS4D NCHS8D
Numbers of branches unit 1 2 4 8
Maximum numbers of
connectable IDUs
Per branch unit 8 8 8 8
Total unit 8 16 32 64
Maximum capacity of
connectable IDUs
Per branch kW 16 16 16 16
Total kW 16 28 45 85
Power supply 220-240V ~50/60Hz
Piping connections
ODU
Liquid mm Φ9.52 Φ9.52 Φ12.7 Φ15.9
High pressure
gas
mm Φ19.05 Φ19.05 Φ22.2 Φ22.2
Low pressure
gas
mm Φ22.2 Φ22.2 Φ28.6 Φ28.6
IDU Liquid mm Φ6.35/9.52 Φ6.35/9.52 Φ6.35/9.52 Φ6.35/9.52
Gas mm Φ12.7/15.9 Φ12.7/15.9 Φ12.7/15.9 Φ12.7/15.9

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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
NCHS1D and NCHS2D.
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
NCHS1D and 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
12 Damping block 1
Wrap the unused low
pressure gas pipe of
NCHS1D
The packed attachments should be subject to actual objects. If there are any alterations, there
will be no further notice.

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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
NOTES!
①The installation of the unit must comply with national and local safety regulations.
②Users can’t install the unit by themselves, because the installation quality will affect the
operation directly. After purchasing the unit, please contact with dealer. The unit must be
installed and debugged by professional installer.
③The unit can be put through power only after all installation work is finished.
3.3 Selection Requirement for Communication Wire
NOTE!
If the unit is installed at the place where there’s strong electromagnetic interference, the
communication wire between indoor unit and wired controller must adopt shield wire, and the
communication wire between indoor unit and indoor unit (outdoor unit) must adopt twisted wire with
shielding function.

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Communication Wire between Mode Exchange Box and indoor unit, outdoor unit:
Fig.3.3.1
Type of wire
Total length of communication
wire between Mode Exchange
Box and another
indoor/outdoor unit L(m)
Wire
diameter
(mm2)
Material
standard Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord
(60227 IEC
52/60227 IEC 53)
L≤1000 ≥2×0.75
IEC
60227-5:2007
1. If the wire diameter is enlarged to
2×1mm2, the total communication
length
can reach 1500m.
2. The cord shall be circular cord (the
cores shall be twisted together).
Communication wire can be longer if
wire diameter is 2×1mm2. But the total
length cannot exceed 1500m.
3. If unit is installed in places with
intense magnetic field or strong
interference, it’s necessary to use
shielded wire.

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3.4 Wiring Requirement
Power cord size and capacity of air switch.
Model Power
Capacity of
air switch
(A)
Min sectional
area for earthing
wire (mm
2
)
Min sectional
area for power
cord(mm
2
)
NCHS1D 220-240V ~50/60Hz 6 1.0 1.0
NCHS2D 220-240V ~50/60Hz 6 1.0 1.0
NCHS4D 220-240V ~50/60Hz 6 1.0 1.0
NCHS8D 220-240V ~50/60Hz 6 1.0 1.0
NOTES!
①Above circuit breaker and power cord specification are selected according to the max power
(max current).
②Specification of power cord is based on the working condition where ambient temperature is
40°C and multi-core copper cable (working temperature is 90°C, e.g. power cable with YJV
cross-linked copper, insulated PE and PVC sheath) is lying on the surface of slot. If working
condition changes, please adjust the specification according to national standard.
③Specification of circuit breaker is based on the working condition where ambient temperature
of circuit breaker is 40°C. If working condition changes, please adjust the specification
according to national standard.
④When installating the cut-off device next to the unit, the min space between every two levels of
cut-off device should be 3mm (for indoor unit and outdoor unit).

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4 Installation Instruction
4.1 Installation of Mode Exchange Box
4.1.1 Dimension of Outdoor Unit and Mounting Hole Position
After the unit is installed, a maintenance port should be reserved at the electric box side of unit
for maintenance. The position of maintenance port should be lower than the lower size of unit.
The Mode Exchange Box shall be installed near the maintenance port or air return of indoor unit.
(Note: if it is installed near the air return, please make sure not to affect air return and maintenance).
The following pictures detailed describe the installation of maintenance port and Mode Exchange
Box:
Fig.4.1.1
Fig.4.1.2
Fig.4.1.3

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Due to the structure of installation space, the Mode Exchange Box needs a maintenance port.
Please reserve another maintenance port for Mode Exchange Box.
Fig.4.1.4
NCHS1D outline and installation dimension:
Unit：mm
Fig.4.1.5

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NCHS2D outline and installation dimension:
Unit：mm
Fig.4.1.6
NCHS4D outline and installation dimension:
Unit：mm
Fig.4.1.7

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NCHS8D outline and installation dimension:
Unit：mm
Fig.4.1.8
4.1.2 Suspend the Mode Exchange Box
(1) Drill bolt holes and install bolts
1) Stick the installation template at the installation position flatly, drill 4 holes at the
installation position basing on the installation template. As shown in Fig.4.1.9. Please refer to the
diameter of expansion bolt for the diameter of hole with depth of 60-70mm. As shown in
Fig.4.1.10.
Unit：mm
Fig.4.1.9Fig.4.1.10
2) Insert M10 expansion bolt into hole, and then set the iron nail into bolt. As shown in
Fig.4.1.11, and then remove the paper pattern.
NOTE!
The length of bolt should be selection according to the height of room. Bolt should be purchased
by the user.

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Fig.4.1.11
(2) Install the Mode Exchange Box 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.
Unit：mm
Fig.4.1.12
NOTES!
①Before operation, please prepare all pipelines (connection pipe, drainage hose) and wires
(connection wire for wired controller, connection wire for Mode Exchange Box).
②When drilling holes on ceiling (air return outlet or air outlet), you can need to reinforce the
ceiling to prevent vibration. For details, please consult user or builder.
③If the strength of the ceiling is not good, please install a beam bracket, and then put the unit on
the beam bracket.
(3) Adjust the unit to the right position
(4) Check the level of the unit
After the Mode Exchange Box is installed, remember to check the horizontal status of the whole
unit. It should be horizontal from front to back and slant 1% from left to right, following the drainage
direction.

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Level
Fig.4.1.13
Cautions for Installation:
①The Mode Exchange Box must be installed by using hanger rod. During installation, the
components must be kept vertically upright according to the indicated direction.
②During installation, enough space shall be considered for removal of the components. The pipe
shall not be jammed between the components.
③The distance of the component to the indoor unit along the pipe shall not be higher than
5000mm.
④The Mode Exchange Box and its upstream branch pipe must be installed on the same
horizontal plane (See schematics below).
Fig.4.1.14
4.2 Pipe Connection
4.2.1 Installation Instruction for Silencer
If there’s silencer in the packing accessories, please refer to below diagram for its installation
method. Take NCHS4D for example.
Connect either left or right side of the mode exchange box to outdoor unit for piping according to
installation space;
(1) Installation instruction for silencer while the right side of box is connected to outdoor unit.
Weld to take off the junction sealing caps on low pressure gas pipe nozzle and liquid pipe nozzle.
Cut off the sealing cap of high pressure gas pipe with a pipe cutter.

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Fig.4.2.1
Take out the two silencers, insert nozzle ODΦ22 mm in silencer 1 to the high pressure gas pipe
on the right side of the box, then insert nozzle ODΦ28 mm in silencer 2 to the low pressure gas pipe
on the right side of the box, weld them together.
Unit：mm
Fig.4.2.2
NOTE!
During welding, wrap up the pipe with wet cloth (as shown in the Fig.4.2.2).
(2) Installation instruction for silencer while the left side of box is connected to outdoor unit;
Weld to take off the junction sealing cap on low pressure gas pipe nozzle of right side. Then weld
the other junction sealing packed with the box on it.
Cut off the sealing caps of high pressure gas pipe, low pressure gas pipe and liquid pipe with a
pipe cutter.
Liquid pipe
Liquid pipe
Cut thispipe outlet
with apipe cutter
Low pressure gaspipe
Low pressure gaspipe
High pressure gas pipe High pressure gas pipe
After welding totake off the
junction sealingcap, welding
to install the other junction
sealing
Fig.4.2.3