Gree GMV-N12U/C-T(U) User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
AHU-KIT
Models：
GMV-N12U/C-T(U)
GMV-N24U/C-T(U)
GMV-N48U/C-T(U)
GMV-N96U/C-T(U)
GMV-N192U/C-T(U)

Preface
For correct installation and operation, please read all instructions carefully. Before reading the
instructions, please be aware of the following items:
DANGER This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
WARNING This mark indicates procedures which, if improperly performed, might lead to the death or
serious injury of the user.
CAUTION This mark indicates procedures which, if improperly performed, might possibly result in
personal harm to the user, or damage to property.
NOTICE NOTICE is used to address practices not related to personal injury.
WARNING
(1) Instructions for installation and use of this product are provided by the manufacturer.
(2) Installation must be performed in accordance with the requirements of NEC and CEC by authorized personnel only.
(3) For the safe operation of this unit, please read and follow the instructions carefully.
(4) During operation, total capacity of indoor units should not exceed the total capacity of outdoor units. Otherwise,
poor effect of cooling or heating may result.
(5) Direct operators or maintainers should well keep this manual.
(6)
If this unit fails to operate normally, please contact our service center as soon as possible and provide the following
information:
1) Content on the nameplate (model number, cooling capacity, production code, ex-factory date).
2) Malfunction details (before and after the malfunction occurs).
(7) Each unit has been strictly tested and proved to be qualified before ex-factory. In order to prevent units from being
damaged or operating normally because of improper disassembly, please do not disassemble the unit by yourself.
If you need to disassemble and check units, please contact our service center. We will send specialists to guide the
disassembly.
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.
DISPOSAL: Do not dispose this product as unsorted municipal waste. Collection of
such waste separately for special treatment is necessary.

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 Precautions.....................................................................................................1
2 Product Introduction...................................................................................................2
2.1 Names of Key Components ................................................................................... 2
2.2 Overall System Connection Diagram...................................................................... 2
2.3 Standard Fittings ................................................................................................... 3
2.4 Specifications........................................................................................................ 4
2.5 Recommended Selection of Air Handling Unit ........................................................ 6
3 Preparations for Installation .....................................................................................10
3.1 Before Installation ............................................................................................... 10
3.2 Location for Installation ........................................................................................11
3.3 Requirements for Communication Wire ................................................................ 12
3.4 Wiring Requirements ........................................................................................... 14
3.5 Piping Requirements ........................................................................................... 14
3.6 Capacity Setting .................................................................................................. 17
4 Installation Instructions ............................................................................................18
4.1 Unit Dimensions and Maintenance Space............................................................. 18
4.2 EXV Installation .................................................................................................. 21
4.3 Installation of the EXV Cable ............................................................................... 24
4.4 Piping Installation................................................................................................ 24
4.5 Installation of the Control Box.............................................................................. 26
4.6 Installation of the Temperature Sensors ............................................................... 28
4.7 Installation of Wired Controller ............................................................................ 31
5 Wire Connection ......................................................................................................32
5.1 Connect Cables and Terminals of Wiring Board.................................................... 32
5.2 Power Cord Connection....................................................................................... 33
5.3 Connection of Communication Wire between Indoor Unit and Outdoor Unit (or Indoor
Unit) ............................................................................................................................... 34
5.4 Connect Communication Wire of Wired Controller ................................................ 35
5.5 Illuminate for Connection of Wired Controller and Indoor Units (AHU-KIT) Network35
6 Function Setting.......................................................................................................37
6.1 Statement on Linkage Function Setting ................................................................ 37
6.2 Fresh air Function Setting ................................................................................... 37
6.3 Selection of Controller......................................................................................... 39
7 Operation and Maintenance .....................................................................................45
7.1 Before Operation................................................................................................. 45
7.2 Test Operation .................................................................................................... 45
7.3 Routine Maintenance........................................................................................... 46
7.4 Disposal Requirements........................................................................................ 46
8 Table of Error Codes for Indoor Unit .........................................................................47
9 Troubleshooting .......................................................................................................48

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1 Safety Precautions
WARNING
(1) 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.
(2) Follow this instruction to complete the installation work. Please carefully read this manual before unit startup
and service.
(3) Wire size of power cord should be large enough. The damaged power cord and connection wire should be
replaced by exclusive cable.
(4) After connecting the power cord, please fix the electric box cover properly in order to avoid accident.
(5) Never fail to comply with the nitrogen charge requirements. Charge nitrogen when welding pipes.
(6) Never short-circuit or cancel the pressure switch to prevent unit damage.
(7) Please firstly connect the wired controller before energization, otherwise wired controller can’t be used.
(8) Before using the unit, please check if the piping and wiring are correct to avoid water leakage, refrigerant
leakage, electric shock, or fire etc.
(9) Do not insert fingers or objects into air outlet/inlet grille.
(10) Open the door and window and keep good ventilation in the room to avoid oxygen deficit when the gas/oil
supplied heating equipment is used.
(11) Never start up or shut off the air conditioner by means of directly plug or unplug the power cord.
(12) Turn off the unit after it runs at least five minutes; otherwise it will influence oil return of the compressor.
(13) Do not allow children operate this unit.
(14) Do not operate this unit with wet hands.
(15) Turn off the unit or cut off the power supply before cleaning the unit, otherwise electric shock or injury may
happen.
(16) Never spray or flush water towards unit, otherwise malfunction or electric shock may happen.
(17) Do not expose the unit to the moist or corrosive circumstances.
(18) Under cooling mode, please don't set the room temperature too low and keep the temperature difference
between indoor and outdoor unit within 5°C(41°F).
(19) User is not allowed to repair the unit. Fault service may cause electric shock or fire accidents. Please
contact Gree appointed service center for help.
(20) Before installation, please check if the power supply is in accordance with the requirements specified on the
nameplate. And also take care of the power safety.
(21) Installation should be conducted by dealer or qualified personnel. Please do not attempt to install the unit by
yourself. Improper handling may result in water leakage, electric shock or fire disaster etc.
(22) The control box should be installed inside
(23) Be sure to use the exclusive accessory and part to prevent the water leakage, electric shock and fire
accidents.
(24) Make sure the unit can be earthed properly and soundly after plugging into the socket so as to avoid
electric shock. Please do not connect the ground wire to gas pipe, water pipe, lightning rod or telephone
line.
(25) Electrify the unit 8 hours before operation. Please switch on for 8 hours before operation. Do not cut off the
power when 24 hours short-time halting (to protect the compressor).
(26) If refrigerant leakage happens during installation, please ventilate immediately. Poisonous gas will emerge
if the refrigerant gas meets fire.
(27) Volatile liquid, such as diluent or gas will damage the unit appearance. Only use soft cloth with a little
neutral detergent to clean the outer casing of unit.
(28) If anything abnormal happens (such as burning smell), please power off the unit and cut off the main power
supply, and then immediately contact Gree appointed service center .If abnormality keeps going, the unit
might be damaged and lead to electric shock or fire.
Any personal injury or property loss caused by improper installation, improper debug, and
unnecessary repair or not following the instructions of this manual should not be the responsibility
of Gree Electric Appliances, Inc. of Zhuhai.

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2 Product Introduction
2.1 Names of Key Components
Fig.2.1
2.2 Overall System Connection Diagram
When one AHU-KIT is connected to one AHU, the connection diagram is as follows:
Fig.2.2.1

AHU-KIT
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When several AHU-KITs are in parallel connection with one AHU, the connection diagram is
as follows:
Fig.2.2.2
2.3 Standard Fittings
Please use the supplied standard fittings listed below as instructed.
No. Name Appearance Quantity
1 Magnetic ring 1or2
2 Swell screw 4
3 Self-tapping screw 4
4 Bundle 1
5 Operating Instruction Manual 1
6 Wired controller 1
7 Insulator 2
8 Aluminum tape — 2
9 Rubber belt — 2

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No. Name Appearance Quantity
10 Fastener 4
11 Reducer pipe
（Only for 24, 96,192 type）2
2.4 Specifications
Model GMV-N12U/C-T(U) GMV-N24U/C-T(U)
GMV-N48U/C-T(U)
Defaulted capacity
of ex-factory
Capacity
12
24
48
Cooling
kW
3.5
7.0
14.1
Cooling
kBtu/h
12.0
24.0
48.0
Heating
kW
4.0
7.9
15.8
Heating
kBtu/h
13.5
27.0
54.0
Adjustable
capacity
Capacity
9
12
15
18
24
30
36
48
60
Cooling
kW
2.6
3.5
4.4
5.3
7.0
8.8
10.6
14.1
17.6
Cooling
kBtu/h
9.5
12.0
15.0
18.0
24.0
30.0
36.0
48.0
60.0
Heating
kW
3.1
4.0
5.0
5.9
7.9
10.0
11.7
15.8
19.7
Heating
kBtu/h
10.5
13.5
17.0
20.0
27.0
34.0
40.0
54.0
67.0
Power input W 8.0 8.0 8.0
Power Supply
—
208/230V ~60Hz
208/230V ~60Hz
208/230V ~60Hz
Size of
connection
pipe
AHU-KIT
(ex-factory pipe
size)
mm Φ6.35 Φ6.35 Φ9.52 Φ9.52 Φ9.52 Φ9.52 Φ9.52 Φ9.52 Φ9.52
inch 1/4 1/4 3/8 3/8 3/8 3/8 3/8 3/8 3/8
Air
handling
unit
Liquid
pipe
mm
Φ6.35
Φ6.35
Φ6.35
Φ9.52
Φ9.52
Φ9.52
Φ9.52
Φ9.52
Φ9.52
inch
1/4
1/4
1/4
3/8
3/8
3/8
3/8
3/8
3/8
Gas pipe
mm Φ9.52 Φ12.7 Φ12.7 Φ15.9 Φ15.9 Φ15.9 Φ15.9 Φ15.9
Φ19.0
5
inch
3/8
1/2
1/2
5/8
5/8
5/8
5/8
5/8
3/4
Connection method
Brazing Connection
Brazing Connection
Brazing Connection
Outline dimension
(W×D×H)
EXV box
mm
203×326×85
203×326×85
203×326×85
inch
8×12-7/8×3-3/8
8×12-7/8×3-3/8
8×12-7/8×3-3/8
Control
box
mm
334×284×111
334×284×111
334×284×111
inch
13-1/8×11-1/8×4-3/8
13-1/8×11-1/8×4-3/8
13-1/8×11-1/8×4-3/8
Net weight
kg
10.0
10.5
10.5
LBS
22
23
23
Model GMV-N96U/C-T(U) GMV-N192U/C-T(U)
Defaulted capacity
of ex-factory
Capacity
96
192
Cooling
kW
28.1
56.3
Cooling
kBtu/h
96.0
192.0
Heating
kW
31.7
63.3
Heating
kBtu/h
108.0
216.0
Adjustable capacity
Capacity
72
96
120
144
168
192
288
Cooling
kW
21.1
28.1
35.2
42.2
49.2
56.3
84.4
Cooling
kBtu/h
72
96
120
144
168
192
288
Heating
kW
23.7
31.7
39.6
47.5
55.4
63.3
95.0
Heating
kBtu/h
81
108
135
162
189
216
324
Power input
W
8.0
8.0
Power Supply
—
208/230V ~60Hz
208/230V ~60Hz
Size of
connection
pipe
AHU-KIT
(ex-factory pipe
size)
mm Φ9.52 Φ9.52 Φ9.52 Φ9.52 Φ15.9 Φ15.9 Φ15.9
inch 3/8 3/8 3/8 3/8 5/8 5/8 5/8
Air
handling
unit
Liquid
pipe
mm
Φ9.52
Φ9.52
Φ12.7
Φ12.7
Φ15.9
Φ15.9
Φ19.05
inch
3/8
3/8
1/2
1/2
5/8
5/8
3/4
Gas
pipe
mm
Φ19.05
Φ22.2
Φ28.6
Φ28.6
Φ28.6
Φ28.6
Φ34.9
inch
3/4
7/8
1-1/8
1-1/8
1-1/8
1-1/8
1-3/8
Connection method Brazing Connection Brazing Connection

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Model GMV-N96U/C-T(U) GMV-N192U/C-T(U)
Outline dimension
(W×D×H)
EXV box
mm
203×326×85
246×500×120
inch
8×12-7/8×3-3/8
9-5/8×19-5/8×4-3/4
Control
box
mm
334×284×111
334×284×111
inch
13-1/8×11-1/8×4-3/8
13-1/8×11-1/8×4-3/8
Net weight
kg
10.5
13.0
LBS
23
29
Model(Combined) GMV-N48U/C-T(U)
+GMV-N192U/C-T(U)
GMV-N96U/C-T(U)
+GMV-N192U/C-T(U)
GMV-N192U/C-T(U)
+GMV-N192U/C-T(U)
Capacity 48+288 96+288 192+288 288+288
Cooling kW 98.5 112.5 140.7 168.8
Cooling kBtu/h 336 384 480 576
Heating kW 110.8 126.6 158.3 189.9
Heating kBtu/h 378 432 540 648
Power input W 8.0+8.0 8.0+8.0 8.0+8.0
Power supply — 208/230V ~60Hz 208/230V ~60Hz 208/230V ~60Hz
Size of
connec
tion
pipe
Air
handli
ng
unit
Liquid
pipe
mm Φ19.05 Φ19.05 Φ19.05 Φ19.05
inch 3/4 3/4 3/4 3/4
Gas
pipe
mm Φ34.9 Φ41.3 Φ41.3 Φ41.3
inch 1-3/8 1-5/8 1-5/8 1-5/8
Outline
dimens
ion
(W×D×
H)
Electronic
expansion
valve box
mm (203×326×85)
+(246×500×120)
(203×326×85)
+(246×500×120) (246×500×120)×2
inch (8×12-7/8×3-3/8)
+(9-5/8×19-5/8×4-3/4)
(8×12-7/8×3-3/8)
+(9-5/8×19-5/8×4-3/4) (9-5/8×19-5/8×4-3/4)×2
Control box
mm (334×284×111)×2 (334×284×111)×2 (334×284×111)×2
inch (13-1/8×11-1/8×4-3/8)
×2
(13-1/8×11-1/8×4-3/8)
×2
(13-1/8×11-1/8×4-3/8)
×2
Net weight kg 10.5+13.0 10.5+13.0 13.0+13.0
LBS 23+29 23+29 29+29
NOTICE
The specifications of the unit is subject to change without prior notice due to improvement
product. Please refer to the nameplate.

AHU-KIT
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2.5 Recommended Selection of Air Handling Unit
Select the air handling unit according to the technical data and limitations mentioned in the
following table. Lifetime of the unit, operation range or operation reliability may be influenced if you
neglect these limitations.
Model(Combined) Capacity
(kBtu/h)
Allowed Heat Exchanger Capacity(kBtu/h)
Cooling Heating
Min. Max. Min. Max.
GMV-N12U/C-T(U) 9 8.5 9.5 9.5 10.5
12 9.5 12 10.5 13.5
GMV-N24U/C-T(U)
15 12 15 13.5 17
18 15 18 17 20
24 18 24 20 27
GMV-N48U/C-T(U)
30 24 30 27 34
36 30 36 34 40
48 36 48 40 54
60 48 60 54 67
GMV-N96U/C-T(U)
72 60 72 67 81
96 72 96 81 108
120 96 120 108 135
144 120 144 135 162
GMV-N192U/C-T(U)
168 144 168 162 189
192 168 192 189 216
288 192 288 216 324
GMV-N48U/C-T(U)+GMV-N192U/C-T(U) 336 288 336 324 378
GMV-N96U/C-T(U)+GMV-N192U/C-T(U) 384 336 384 378 432
GMV-N192U/C-T(U)+GMV-N192U/C-T(U)
480 384 480 432 540
576 480 576 540 648
NOTICE
The capacity is obtained at these test conditions: superheat (SH) = 5°C(41°F) and supercool (SC) = 3°C(37.4°F).
Cooling: Saturated evaporating temperature = 6°C(42.8°F), air return temperature is
27°C(80.6°F)DB/19°C(66.2°F)WB.
Heating: Saturated condensing temperature = 46°C(114.8°F), air return temperature is 20°C(68°F)DB.
The heat exchanger of air handling unit is designed for R410A, and its working pressure is 3.8MPa.
Recommendation：Quantity of rows of heat exchanger: no more than 4 rows.
Recommendation：The diameter of copper pipe of heat exchanger is no more than 12.7mm(1/2 inch), 9.52mm(
3/8
inch) is recommended.
Air inlet temperature range of heat exchanger: cooling: 16~35°C(60.8~95°F), heating: 10~27°C(50~80.6°F).
NOTICE
When the AHU-KIT is matched with AHU, they can connect with VRF outdoor unit as VRF

AHU-KIT
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indoor unit. The connection is limited by the outdoor unit. There are three kinds of connection
method:
(1) Connection method 1: one-to-one
The AHU-KIT as below can adopt one-to-one connection method with VRF outdoor unit. Total
capacity of AHU-KIT should be 50%~110% of that of outdoor unit.
Model(Combined) Capacity in application (kBtu/h)
GMV-N24U/C-T(U) 24
GMV-N48U/C-T(U)
30
36
48
60
GMV-N96U/C-T(U)
72
96
120
144
GMV-N192U/C-T(U)
168
192
288
GMV-N48U/C-T(U)+GMV-N192U/C-T(U) 336
GMV-N96U/C-T(U)+GMV-N192U/C-T(U) 384
GMV-N192U/C-T(U)+GMV-N192U/C-T(U)
480
576
(2) Connection method 2: one-to-more
The AHU-KIT as below can adopt one-to-more connection method with VRF outdoor unit.
Total capacity of AHU-KIT should be 50%~110% of that of outdoor unit.
Model Capacity in application (kBtu/h)
GMV-N12U/C-T(U) 9
12
GMV-N24U/C-T(U)
15
18
24
GMV-N48U/C-T(U)
30
36
48
60
GMV-N96U/C-T(U)
72
96
120
144
GMV-N192U/C-T(U)
168
192
288

AHU-KIT
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NOTICE
9~144 kBtu/h units can be connected to the same system; 72~288 kBtu/h units can be
connected to the same system.
(3) Connection method 3: one-to-more (mixed connection)
The AHU-KIT as below can adopt one-to-more connection method with general VRF indoor
unit. Total capacity of AHU-KIT and VRF indoor unit should be 50%~110% of that of outdoor unit.
Total capacity of AHU-KIT cannot exceed 30% of that of outdoor unit.
Model Capacity in application (kBtu/h)
GMV-N12U/C-T(U) 9
12
GMV-N24U/C-T(U)
15
18
24
GMV-N48U/C-T(U)
30
36
48
60
GMV-N96U/C-T(U) 72
96
NOTICE
When connecting AHU-KIT with general VRF indoor unit, capacity requirement shall be
followed strictly. Otherwise, it may affect the operation, or even damage the unit.
Fig.2.5.1 AHU-KIT one-to-one (single unit) connection diagram

AHU-KIT
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Fig.2.5.2 AHU-KIT one-to-one (combination outdoor unit) connection diagram
Fig.2.5.3 AHU-KIT one-to-more connection diagram

AHU-KIT
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Fig.2.5.4 AHU-KIT one-to-more (hybrid connection) connection diagram
3 Preparations for Installation
3.1 Before Installation
NOTICE
Product graphics are only for reference. Please refer to actual products. Unspecified measure
unit is mm(inch).
(1) This equipment is designed for R410A system, and the designed working pressure is
4.3MPa or 43bar.
(2) Working Ambient Temp. Tmax=113°F (45°C).
(3) Precautions for R410A:
a).The refrigerant requires strict cautions for keeping the system clean, dry and tight.
—Clean and dry: Foreign materials (including mineral oils or moisture) should be
prevented from getting mixed into the system.
—Tight: Read this manual carefully and follow these procedures correctly.
b).Since R410A is a mixed refrigerant, the required additional refrigerant must be charged
in its liquid state. (If the refrigerant is in state of gas, its composition changes and the
system will not work properly).
(4) The connected air handling units must have heat exchangers designed exclusively for
R410A．

AHU-KIT
11
(5) Never use this appliance in a place with inflammable and explosive gas.
(6) For the following items, take special care during construction and check after installation
is finished:
Tick √ when checked
□Are the temperature sensors fixed firmly?
Temperature sensor may come loose.
□Is the capacity code set correctly?
System performance may not reach relevant requirements or will lead to reliability problem.
□Is the control box fixed firmly?
The unit may drop, vibrate or make noise.
□Do electrical connections comply with specifications?
The unit may malfunction or components may burn out.
□Are wiring and piping correct?
The unit may malfunction or components may burn out.
□Is the unit safely grounded?
Dangerous at electric leakage.
3.2 Location for Installation
Select an installation site where the following conditions are fulfilled and that meets your
customer’s approval.
(1) The EXV box can be installed inside and outside. The control box should be installed
inside.
(2) Do not install the EXV box in or on the outdoor unit.
(3) Do not put the option boxes in direct sunlight. Direct sunlight will increase the temperature
inside the option boxes and may reduce its lifetime and influence its operation.
(4) Choose a flat and strong mounting surface.
(5) Make sure there is enough free space in front and in the side of the AHU-KIT unit for
future maintenance.
(6) The installation site should be far away from heat source, inflammable gas and smoke.
(7) Keep the air handling unit, power supply wiring and transmission wiring at least 1m(39-3/8
inch) away from televisions and radios. This is to prevent image interference and noise in
those electrical appliances (Noise may be generated depending on the conditions under
which the electric wave is generated, even if 1m(39-3/8 inch) is kept.).
(8) Make sure the electronic expansion valve is installed in an upright position.

AHU-KIT
12
NOTICE
Do not install or operate the unit in rooms mentioned below:
a) Where mineral oil, like cutting oil is present.
b) Where the air contains high levels of salt such as air near the ocean.
c) Where sulphurous gas is present such as that in areas of hot spring.
d) In vehicles or vessels.
e) Where voltage fluctuates a lot such as that in factories.
f) Where high concentration of vapor or spray are present.
g) Where machines generating electromagnetic waves are present.
h) Where acidic or alkaline vapor is present.
Installing this unit must comply with the relevant local and national codes.
Connecting the power after all installation works are done.
3.3 Requirements for Communication Wire
NOTICE
If the unit is installed in the place with strong electromagnetic interference, shielded wire must
be applied on the communication wire between indoor unit (AHU-KIT) and wired controller.
Twisted pair wire with shielding function must be applied on the communication wire between
indoor unit and indoor unit (outdoor unit).
3.3.1 Selecting communication wire for AHU-KIT and wired controller
Wire type
Total length of
communication wire
between indoor unit
and wired controller
Wire size Remarks
Light/Ordinary
polyvinyl chloride
sheathed cord.
L≤250m
(L≤820-1/4feet) 2×AWG18~2×AWG16
1. Total length of communication cable
can't exceed 250m (820-1/4feet).
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.
Connection between AHU-KIT and wired controller is shown as follows：
(1) When one AHU-KIT is connected to one AHU, you can adopt the connection ways of one
wired controller to one AHU-KIT or one wired controller to several AHU-KITs (group
control, n≤16).
(2) When several AHU-KITs are in parallel connection with one AHU, you can only adopt the
way of one wired controller to several AHU-KITs (group control).

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Fig.3.3.1 one wired controller to one AHU-KIT
Fig.3.3.2 one wired controller to several AHU-KITs
3.3.2 Select Communication wire for AHU-KIT and Outdoor Unit
Fig.3.3.3
Wire type
Total Length L of
Communication Cable between
Indoor Unit and Indoor
(Outdoor) Unit
Wire size Remarks
Light/Ordinary
polyvinyl
chloride
sheathed cord.
L≤1000m
(L≤3280-7/8feet) ≥2×AWG18
1. If the wire diameter is enlarged to
2×AWG16, the total communication
cable length can reach 1500m
(4921-1/4feet).
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.

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3.4 Wiring Requirements
Power Cord Size and Air Switch Capacity:
Model Power Supply Fuse
Capacity(A)
Minimum Circuit
Capacity(A)
Maximum Overcurrent
Protection(A)
GMV-N12U/C-T(U)
208/230V ~60Hz
15 10 15
GMV-N24U/C-T(U) 15 10 15
GMV-N48U/C-T(U) 15 10 15
GMV-N96U/C-T(U) 15 10 15
GMV-N192U/C-T(U) 15 10 15
NOTICE
Use copper wire only as unit’s power cord. Operating temperature should be within its rated value.
①Above selection requirements: Power cord size is based on BV single-core wire (2~4pc) at 40°C(104°F)
ambient temperature when laying across plastic pipe. Air switch is D type and used at 40°C(104°F). If actual
installation condition varies, please lower the capacity appropriately according to the specifications of power
cord and air switch provided by manufacturer.
②Install cut-off device near the unit. The minimum distance between each stage of cut-off device should be 3
mm(1/8 inch) (The same for both indoor unit and outdoor unit).
3.5 Piping Requirements
3.5.1 Selection of Piping Requirements
(1) Ensure the inside of the pipes is clean and no foreign materials.
(2) Pipe specifications:
R410A System
Pipe Diameter mm(inch) Wall Thickness mm(inch) Temper grade of piping material
Φ6.35(1/4) ≥0.8(1/32) O
Φ9.52(3/8) ≥0.8(1/32) O
Φ12.70(1/2) ≥0.8(1/32) O
Φ15.9(5/8) ≥1.0(3/76) O
Φ19.05(3/4) ≥1.0(3/76) 1/2H
Φ22.2(7/8) ≥1.2(1/21) 1/2H
Φ28.6(1-1/8) ≥1.2(1/21) 1/2H
Φ34.90(1-3/8) ≥1.3(2/39) 1/2H
Φ41.30(1-5/8) ≥1.5(1/17) 1/2H

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3.5.2 Piping Design
When one AHU-KIT is connected to one AHU, the piping diagram is as follows:
Fig.3.5.1 One AHU-KIT to one AHU
When several AHU-KITs are connected to one AHU, the piping diagram is as follows:
Fig.3.5.2 Several AHU-KITs to one AHU
3.5.2.1 Selection of Branch Pipe
(1) Branch pipes (a, b) between outdoor units shall be selected according to the total capacity
of outdoor unit ,as follows:
— Model
Selection of branch pipe between ODU modules ML01/A
(2) Branch pipe (c, d) between indoor units shall be selected according to the total capacity of
downstream IDUs, as follows:

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Selection of branch pipe between
indoor units
Total rated capacity of downstream
IDUs C(kBtu/h) Model
Y-type Manifold
C<68 FQ01A/A
68≤C≤102 FQ01B/A
102<C≤239 FQ02/A
239<C≤461 FQ03/A
461<C FQ04/A
T- type Manifold
C≤136 FQ14/H1
C≤232 FQ18/H1
232<C FQ18/H2
(3) When several AHU-KITs are connected to one AHU, branch pipe (e) shall be selected
according to the following table:
Model(Combined) Branch pipe Quantity
GMV-N48U/C-T(U)+GMV-N192U/C-T(U) FQ02U/A 1
GMV-N96U/C-T(U)+GMV-N192U/C-T(U) FQ02U/A 1
GMV-N192U/C-T(U)+GMV-N192U/C-T(U) FQ02U/A 1
3.5.2.2 Selection of Piping Dimension
Piping dimension can be selected according to the total rated capacity of upstream or
downstream modules. Detailed requirements are as below:
(1) Piping (A, B, C) from ODU to branch pipe shall be selected according to the rated capacity
of ODU;
(2) Piping D between branch pipes of ODU modules shall be selected according to the total
rated capacity of upstream modules;
(3) Piping E and G of branch pipe at IDU side shall be selected according to the total rated
capacity of downstream IDUs;
(4) Piping F from IDU branch pipe to IDU shall be selected according to the rated capacity of
IDU;
(5) Piping (I1, I2, J, H) between branch pipe and AHU-KIT shall be selected according to the
capacity of AHU-K IT.
Relationship between capacity and piping dimension is as below:
Rated capacity (kBtu/h) Gas pipe mm(inch) Liquid pipe mm(inch)
Q≤72 Φ19.05(3/4) Φ9.52(3/8)
72<Q≤96 Φ22.2(7/8) Φ9.52(3/8)
96<Q≤120 Φ28.6(1-1/8) Φ12.7(1/2)
120<Q≤144 Φ28.6(1-1/8) Φ12.7(1/2)
144<Q≤168 Φ28.6(1-1/8) Φ15.9(5/8)