Gree GMV-224WM/B-X User manual

GMV-224WM/B-X
GMV-280WM/B-X
GMV-335WM/B-X
GMV-400WM/B-X
GMV-450WM/B-X
GMV-504WM/B-X
GMV-1800WM/B-X
Change for life
D.C. Inverter
Multi VRF Modular
Air Conditioners
Owner's Manual
Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference.If you have lost the Owner’s Manual, please
contact the local agent or visit www.gree.com or sent email to [email protected] or
electronic version.
GREE reserves the right to interpret this manual which will be subject to any change due
to product improvement without further notice.
GREE Electric Appliances, Inc. of Zhuhai reserves the nal right to interpret this manual.

Preface
Gree DC Inverter Multi VRF System, with the most advanced technologies in the world, uses eco-
friendly refrigerant R410A as its cooling medium. For correct installation and operation, please read
this manual carefully. Before reading the manual, please note that:
(1) For safety operation, please strictly follow the instructions in this manual.
(2) During operation, the gross rated capacity of working IDU should be within the gross rated
capacity of ODU. Otherwise, IDU’s cooling/heating performance will be reduced.
(3) This manual must be in the hands of direct operators or maintenance men.
(4) In case of malfunction and operation failure, please examine the following items and contact
our authorized service centers as soon as possible.
1) Nameplate (model, cooling capacity, product code, ex-factory date).
2) Malfunction status (detail description of conditions before and after malfunction occurs)
(6) All units have been strictly tested and proved to be qualied before ex-factory. To avoid unit
damage or even operation failure which may be caused by improper disassembly, please do
not disassemble units by yourself. If disassembly is needed, please contact our authorized
serve centers for help.
(7) All graphics and information in this manual are only for reference. Manufacturer reserves the
right for changes in terms of sales or production at any time and without prior notice.
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:Donot dispose this product as unsorted municipal waste. Collection of such waste
separately for special treatment is necessary.

Contents
1 Safety Precautions ..................................................................................1
2 Product Introduction ................................................................................3
2.1 Names of Main Parts ................................................................................ 3
2.2 Combinations of Outdoor Units................................................................. 3
2.3 Combinations of Indoor and Outdoor Units .............................................. 4
2.4 The Range of Production Working Temperature....................................... 5
3 Preparation before Installation.................................................................6
3.1 Standard Parts.......................................................................................... 6
3.2 Installation Site ......................................................................................... 6
3.3 Piping Work Requirements ..................................................................... 10
4 Installation Instruction........................................................................... 11
4.1 Physical Dimension of the Outdoor Unit and Mounting Hole...................11
4.2 Connection Pipe ..................................................................................... 12
4.3 Installation of the Connection Pipe ......................................................... 22
4.4 Air Purging and Refrigerant Charge........................................................ 24
4.5 Electric Wiring......................................................................................... 25
4.6 System Communication.......................................................................... 29
4.7 Connection Method and Steps for System Communication ................... 33
4.8 External Electrical Wiring Diagram ......................................................... 38
5 Check Items after Installation and Trial Run .........................................40
5.1 Check Items after Installation ................................................................. 40
5.2 Trial Run ................................................................................................ 40
6 Common Malfunction and Troubleshooting...........................................52
7 Error Indication ......................................................................................54
8 Maintenance and Care ..........................................................................56
8.1 Outdoor Heat Exchanger ........................................................................ 56
8.2 Drain Pipe ............................................................................................... 56
8.3 Notice before Seasonal Use ................................................................... 56
8.4 Maintenance after Seasonal Use............................................................ 56
8.5 Parts Replacement ................................................................................. 56
9 After-sales Service................................................................................56

D.C. Inverter Multi-variable Modular
1
1 Safety Precautions
Refers to things that are not allowed. Incorrect operation may cause personal injury
or death.
refers to things that must be followed. Incorrect operation may cause personal injury
or death.
Exclusive
accessory
exclusive
Follow this instruction to complete
the installation work. Please
carefully read this manual before
unit startup and service.
Please rstly connect the wired
controller before energization,
otherwise wired controller can
not be used.
Wire size of power cord should
be large enough.The damaged
power cord and connection wire
should be replaced by exclusive
cable.
Never fail to comply with the
nitrigen charge requirements.
Charge nitrogen when welding
pipes.
Before installation, please check if
the power supply is in accordance
with the requirements specied on
the nameplate. And also take care
of the power safety.
Installation should be conducted
by dealer or qualied personnel.
Please do not attempt to install the
unit by yourself. Improper handling
may result in water leakage,
electric shock or re disaster etc.
Be sure to use the exclusive
accessory and part to prevent the
water leakage, electric shock and
re accidents.
Before using the unit, please check
if the piping and wiring are correct
to avoid water leakage, refrigerant
leakage, electric shock, or re etc.
If refrigerant leakage happens
during installation, please ventilate
immediately. Poisonous gas will
emerge if the refrigerant gas meets
re.
After connecting the power cord,
please x the electric box cover
properly in order to avoid accident.
Never short-circiut or cancel the
pressure switch to prevent unit
damage.
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.
N2

D.C. Inverter Multi-variable Modular
2
If anything abnormal happens
(such as burning smell), please
power off the unit and cut off
the main power supply, and
then immerdiately contact Gree
appointed service center.If
abnormality keeps going, the unit
might be damaged and lead to
electric shock or re.
User is not allowed to repair the
unit. Fault service may cause
electric shock or re accidents.
Please contact Gree appointed
service center for help.
Do not insert fingers or objects
into air outlet/inlet grille.
Never start up or shut off the air
conditioner by means of directly
plug or unplug the power cord.
Do not allow children
operate this unit.
Turn off the unit or cut off the
power supply before cleaning the
unit, otherwise electric shock or
injury may happen.
Do not expose the unit
to the moist or corrosive
circumstances.
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.
Open the door and window and
keep good ventilation in the room
to avoid oxygen decit when
the gas/oil supplied heating
equipment is used.
Turn off the unit after it runs at
least ve minutes; otherwise it
will inuence oil return of the
compressor.
Do not operate this unit
with wet hands.
Never spray or ush water
towards unit, otherwise
malfunction or electric shock
may happen.
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).
Under cooling mode, please
don't set the room temperature
too low and keep the
temperature difference between
indoor and outdoor unit within
5.
＜5Min
24H
26 C
30 C
GREE will not assume responsibility of personal injury or equipment damage caused by
improper installation and commission, unnecessary service and incapable of following the rules and
instructions listed in this manual.

D.C. Inverter Multi-variable Modular
3
2 Product Introduction
Gree Multi VRF Modular System adopts inverter compressor technology. According to change
the displacement of compressor, stepless capacity regulation within range of 10%-100% can be
realized. Various product lineup is provided with capacity range from 22.4kW to 180kW, which can be
widely used in working area and especially applicable to the place with variable load change.Gree air
conditioner is absolutely your best choice.
2.1 Names of Main Parts
11
2
3 3 4 54 5 4 5 4 5
2
Air inlet
Air inlet
Air inlet
Air inlet
Air outlet
Air outlet
Air outlet
Fig.1
NO.
Name Fan, Motor Electric Box
Assembly Valve interface Power cord through-hole
Communication
code through-hole
2.2 Combinations of Outdoor Units
Model
(Single) GMV-504WM/B-X GMV-560WM/B-X GMV-615WM/B-X GMV-680WM/B-X
Model
(Combined)
GMV-224WM/B-X
+GMV-280WM/B-X
GMV-280WM/B-X
+GMV-280WM/B-X
GMV-280WM/B-X
+GMV-335WM/B-X
GMV-280WM/B-X
+GMV-400WM/B-X
Model
(Single) GMV-730WM/B-X GMV-785WM/B-X GMV-850WM/B-X GMV-900WM/B-X
Model
(Combined)
GMV-280WM/B-X
+GMV-450WM/B-X
GMV-335WM/B-X
+GMV-450WM/B-X
GMV-400WM/B-X
+GMV-450WM/B-X
GMV-450WM/B-X
+GMV-450WM/B-X
Model
(Single) GMV-960WM/B-X GMV-1010WM/B-X GMV-1065WM/B-X GMV-1130WM/B-X
Model
(Combined)
GMV-280WM/B-X
+GMV-280WM/B-X
+GMV-400WM/B-X
GMV-280WM/B-X
+GMV-280WM/B-X
+GMV-450WM/B-X
GMV-280WM/B-X
+GMV-335WM/B-X
+GMV-450WM/B-X
GMV-280WM/B-X
+GMV-400WM/B-X
+GMV-450WM/B-X

D.C. Inverter Multi-variable Modular
4
Model
(Single) GMV-1180WM/B-X GMV-1235WM/B-X GMV-1300WM/B-X GMV-1350WM/B-X
Model
(Combined)
GMV-280WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
GMV-335WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
GMV-400WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
GMV-450WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
Model
(Single) GMV-1410WM/B-X GMV-1460WM/B-X GMV-1515WM/B-X GMV-1580WM/B-X
Model
(Combined)
GMV-280WM/B-X
+GMV-280WM/B-X
+GMV-400WM/B-X
+GMV-450WM/B-X
GMV-280WM/B-X
+GMV-280WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
GMV-280WM/B-X
+GMV-335WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
GMV-280WM/B-X
+GMV-400WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
Model
(Single) GMV-1630WM/B-X GMV-1685WM/B-X GMV-1750WM/B-X GMV-1800WM/B-X
Model
(Combined)
GMV-280WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
GMV-335WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
GMV-400WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
GMV-450WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
+GMV-450WM/B-X
2.3 Combinations of Indoor and Outdoor Units
(1) The following table indicates the number of IDU for ODU
ODU model Max number of connectable IDU (unit)
GMV-224WM/B-X 13
GMV-280WM/B-X 16
GMV-335WM/B-X 19
GMV-400WM/B-X 23
GMV-450WM/B-X 26
GMV-504WM/B-X 29
GMV-560WM/B-X 33
GMV-615WM/B-X 36
GMV-680WM/B-X 39
GMV-730WM/B-X 43
GMV-785WM/B-X 46
GMV-850WM/B-X 50
GMV-900WM/B-X 53
GMV-960WM/B-X 56
GMV-1010WM/B-X 59
GMV-1065WM/B-X 63
GMV-1130WM/B-X 64
GMV-1180WM/B-X 64
GMV-1235WM/B-X 64
GMV-1300WM/B-X 64
GMV-1350WM/B-X 64
GMV-1410WM/B-X 66
GMV-1460WM/B-X 69
GMV-1515WM/B-X 71
GMV-1580WM/B-X 74
GMV-1630WM/B-X 77
GMV-1685WM/B-X 80
GMV-1750WM/B-X 80
GMV-1800WM/B-X 80

D.C. Inverter Multi-variable Modular
5
The total capacity of indoor units should be within 50%~135% of that of outdoor units.
Indoor Unit
Four-way Cassette Type One-way Cassette Type Wall Mounted Type Duct Type
Outdoor Unit
Fig.2
Fig.2 is the combination view of the ODU of Modular DC Inverter Multi VRF System and the IDU
of Multi VRF System. IDU can be cassette type, one-way cassette type, wall-mounted type, duct type,
etc. When any one IDU receives operation signal, ODU will start to work according to the capacity;
when all IDUs stop, ODU will also stop.
2.4 The Range of Production Working Temperature
Cooling Ambient temperature: -5 ~52
Heating Ambient temperature: -20 ~24
When the indoor units are all VRF fresh air processor, the unit operating range is as follows:
Cooling Ambient temperature: 16°C~45°C
Heating Ambient temperature: -7°C~16°C
If the temperature is beyond the range, the safety protection measure of the unit may take effect,
and the air conditioning unit will stop.

D.C. Inverter Multi-variable Modular
6
3 Preparation before Installation
Note: The picture is only used for reference and the actual product prevails. Unit: mm.
3.1 Standard Parts
Please use the following standard parts supplied by Gree.
Parts for Outdoor Unit
Number Name Picture Quantity Remarks
1 Owner's Manual GMV-224WM/B-X
GMV-280WM/B-X
GMV-335WM/B-X
GMV-400WM/B-X
GMV-450WM/B-X
GMV-504WM/B-X
GMV-1800WM/B-X
Change for life
D.C. Inverter
Multi VRF Modular
Air Conditioners
Owner's Manual
Thank you for choosingAir Conditioners, please read this owner ’s manual carefully before
operation and retain it for future reference.
GREE reserves the right to interpret this manual which will be subject to any change due
to product improvement without further notice.
GREE Electric Appliances, Inc. of Zhuhai reserves the nal right to interpret this manual.
1
2Wiring (match with
resistance) 1
Must be connected to the
last IDU of communication
connection
3 Mark (Master ) 2Attach on the wired controller of
master IDU or on the front panel
3.2 Installation Site
Forbidden Items! It indicates that improper operation might lead to human casualty or
sever injury.
Items need to be followed. It indicates that improper operation might lead to personal
injury or property damage.
Install the unit at a place where
is adequate to withstand the
weight of the unit and make
sure the unit would not shake
or fall off.
Never expose the unit under
direct sunshine and rainfall.
Install the unit at a place where
is against dust, typhoon and
earthquake.
Try to keep the unit away
from combustible,inammable
and corrosive gas or exhaust
gas.
Keep the indoor and outdoor
units close to each other as
much as possible so as to
decrease the pipe length and
bends.
Leave some space for heat
exchanging and servicing so
as to guarantee unit normal
operation.
Never allow children to
approach to the unit and take
measures to prevent children
touching the unit.

D.C. Inverter Multi-variable Modular
7
3.2.1 When the outdoor unit is totally surrounded by walls, please refer to following
gures for space dimension.
3.2.1.1 Space dimension for single-module unit
Electrical Box
Outlet on this side
Air Outlet
＞1000
＞3000
＞1000＞1000
＞1200
Fig. 3
3.2.1.2 Space dimension for dual-module unit
Electrical Box
Outlet on this side
Air Outlet
＞1000
＞200
＞3000
＞1000＞1000
＞1200
＞200
Fig. 4
3.2.1.3 Space dimension for three-module unit
Electrical Box
Outlet on this side
A
ir Outlet
＞1000
＞200＞200
＞3000
＞1000＞1000
＞1200
＞200＞200
Fig.5

D.C. Inverter Multi-variable Modular
8
3.2.1.4 Space dimension for four-module unit
Electrical Box
Outlet on this sid
e
Air Outlet
＞1000
＞200
＞200＞200＞200
＞200＞200
＞3000
＞1000＞1000
＞1200
Fig.6
3.2.2 When there is wall (or similar obstruction) above the unit, keep the distance
between the unit top and the wall at least 300mm or above. When the unit is located
in a totally open space with no obstructions in four directions, keep the distance
between the unit top and wall at least 1500mm or above (See Fig.7). When space
is limited within 1500mm or the unit is not set in an open space, air return pipe is
required to be installed in order to keep good ventilation (See Fig.8).
Air Outlet
Crown wall
When the distance is less than
1500mm, connect an air duct
so as to keep good ventilation.
＞1500
＞
1000
＞
200
Fig.7 Fig.8

D.C. Inverter Multi-variable Modular
9
3.2.3 Space dimension for multiple-module unit
For keeping good ventilation, make sure there is no obstructions above the unit.
When the unit is located at a half-open space (front and left/right side is open), install the unit as
per the same or opposite direction.
＞200 ＞200 ＞1000
＞1200 ＞1000
＞200 ＞200 ＞1000
＞1200 ＞1000
No limit on the height of wall
Front side
Front side
Back side
Back side
Max. 4 sets side by side
Fig.9
＞200
＞200 ＞200 ＞1000
＞1200 ＞1200
＞200 ＞1000
＞1200 ＞1200
No limit on the height of wall
Front side
Front side
Back side
Back side
Max. 4 sets side by side
Fig.10
3.2.4 Take seasonal wind into consideration when installing the outdoor unit
Correct Incorrect：
In this case,
the defrosting duration
will be extended.
S
easonal wind Seasonal wind Seasonal wind
Seasonal wind
Protective cover
Return air
Return air Return air
Return air
Front Front
Front
Front
Fig.11

D.C. Inverter Multi-variable Modular
10
3.2.5 Take snow into consideration when installing the outdoor unit
Correct
Incorrect
S
easonal wind Seasonal wind
Protective cover at
the supply air outlet
(field supplied)
Protective cover at
the return air inlet
(field supplied)
The height of the base should
higher than that of the snowfall.
Fig.12
3.3 Piping Work Requirements
There should be no fall among outdoor modules. Refer to the table below for piping work
requirements.
R410A Refrigerant System
Outer Diameter (mm) Wall Thickness (mm) Type
Φ6.35 0.8 0
Φ9.52 0.8 0
Φ12.70 0.8 0
Φ15.9 1.0 0
Φ19.05 1.0 1/2H
Φ22.2 1.2 1/2H
Φ25.40 1.2 1/2H
Φ28.60 1.2 1/2H
Φ34.90 1.3 1/2H
Φ38.10 1.5 1/2H
Φ41.30 1.5 1/2H
Φ44.5 1.5 1/2H
Φ54.1 1.5 1/2H

D.C. Inverter Multi-variable Modular
11
4 Installation Instruction
4.1 Physical Dimension of the Outdoor Unit and Mounting Hole
Outline and Physical Dimention of GMV-224WM/B-X and GMV-280WM/B-X unit.
792
930 765
7291605
1
22
15
1
Installation hole
Fig.13
Outline and Physical Dimention of GMV-335WM/B-X, GMV-400WM/B-X and GMV-450WM/B-X
unit.
1200
765
1340
729
1605
2
22
15
2
Installation hole
Fig.14

D.C. Inverter Multi-variable Modular
12
4.2 Connection Pipe
4.2.1 Schematic Diagram of Piping Connection
Module
No.1
Module
No.2
Module
No.3
Module
No.4 Manifold between
outdoor units
Gas pipe
Liquid pipe
Outdoor
connection pipe
Oil balance pipe
Connection pipe between
outdoor manifolds
Connection pipe between outdoor
manifold and the first indoor manifold
Connection pipe between indoor
manifold and indoor units
Connection pipe between indoor
manifold and indoor units
Connection pipe between indoor
manifold and indoor units
Manifold between
indoor units Connection pipe between
indoor manifolds
Connection pipe between
indoor manifolds
Connection pipe between
indoor manifolds
Indoor unit 1
Indoor unit 2
Indoor unit 3
Fig.15

D.C. Inverter Multi-variable Modular
13
4.2.2 Schematic Diagram of Piping Sequence
GMV-224WM/B-X and GMV-280WM/B-X
Liquid pipe Gas pipe
Oil checking valve
Low pressure
check valve
Oil balance pipe
Fig.16
GMV-335WM/B-X, GMV-400WM/B-X and GMV-450WM/B-X
Liquid pipe Gas pipe
Oil checking valve
Low pressure
check valve
Oil balance pipe
Fig.17

D.C. Inverter Multi-variable Modular
14
4.2.3 Allowable pipe length and drop height among indoor and outdoor units
Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is shown
in the gure below.
Remark: Equivalent length of one Y-type manifold is about 0.5m.
L1
L2
L11
L10
L6
L3 L4 L5
L7 L8 L9
Height difference between indoor unit and outdoor unit: H
The 1st
branch section
Height difference
Indoor unit
Outdoor unit
between outdoor unit and the farthest indoor unit
Fig.18
L10: Length from the rst branch to the farthest IDU;
L11: Length from the rst branch to the nearest IDU;
Equivalent length of branch of IDU is 0.5m
R410A Refrigerant System Allowable
Value Fitting Pipe
Total length (actual length) of tting pipe 1000 L1+L2+L3+L4+…+L9+a+b+…+i+j
Length of farthest tting
pipe(m)
Actual length 165 L1+L6+L7+L8+L9+j
Equivalent length 190
Difference between the pipe length from the rst branch
of IDU to the farthest IDU and the pipe length from the
rst branch of IDU to the nearest IDU
40 L10-L11
Equivalent length from the rst branch to the furthest
piping (1) 40 L6+L7+L8+L9+j

D.C. Inverter Multi-variable Modular
15
Height difference
between outdoor unit and
indoor unit
Outdoor unit at upper(2) 90 ——
Outdoor unit at lower 90 ——
Height difference between indoor units (m) 30 ——
Maximum length of Main pipe(3) 90 L1
From IDU to its nearest branch (4) 10 a,b,c,d,e,f,g,h,i,j
Notices:
(1) Normally, the pipe length from the rst branch of IDU to the farthest IDU is 40m. When those
three conditions as below are satised, the length can reached 90cm..
1) Actual length of pipe in total: L1+L2x2+L3x2+L4x2+…+L9x2+a+b+…+i+j≤1000m;
2) Length between each IDU and its nearest branch a, b, c, d, e, f, g, h, i, j≤40m;
3) Difference between the pipe length from the rst branch of IDU to the farthest IDU and the
pipe length from the rst branch of IDU to the nearest IDU: L10-L11≤40m.
(2) When the outdoor unit is at upper side and height difference is more than 50m, please consult
company for the related technical requirement.
(3) When the maximum length of the main pipe from ODU to the rst branch of IDU is≥90m, then
adjust the pipe size of the gas pipe and liquid pipe of main pipe according to the following
table.
Outdoor Model Gas pipe size(mm) Liquid pipe size(mm)
GMV-224WM/B-X No need to enlarge pipe size No need to enlarge pipe size
GMV-280WM/B-X No need to enlarge pipe size Φ12.7
GMV-335WM/B-X Φ28.6 Φ15.9
GMV-400WM/B-X Φ31.8 Φ15.9
GMV-450WM/B-X Φ31.8 Φ15.9
GMV-504WM/B-X Φ34.9 Φ19.05
GMV-560WM/B-X Φ34.9 Φ19.05
GMV-615WM/B-X Φ34.9 Φ19.05
GMV-680WM/B-X No need to enlarge pipe size Φ19.05
GMV-730WM/B-X Φ38.1 Φ22.2
GMV-785WM/B-X Φ38.1 Φ22.2
GMV-850WM/B-X Φ38.1 Φ22.2
GMV-900WM/B-X Φ38.1 Φ22.2
GMV-960WM/B-X Φ41.3 Φ22.2
GMV-1010WM/B-X Φ44.5 Φ22.2
GMV-1065WM/B-X Φ44.5 Φ22.2
GMV-1130WM/B-X Φ44.5 Φ22.2
GMV-1180WM/B-X Φ44.5 Φ22.2
GMV-1235WM/B-X Φ44.5 Φ22.2
GMV-1300WM/B-X Φ44.5 Φ22.2
GMV-1350WM/B-X Φ44.5 Φ22.2
GMV-1410WM/B-X No need to enlarge pipe size Φ25.4
GMV-1460WM/B-X No need to enlarge pipe size Φ25.4
GMV-1515WM/B-X No need to enlarge pipe size Φ25.4
GMV-1580WM/B-X No need to enlarge pipe size Φ25.4
GMV-1630WM/B-X No need to enlarge pipe size Φ25.4
GMV-1685WM/B-X No need to enlarge pipe size Φ25.4
GMV-1750WM/B-X No need to enlarge pipe size Φ25.4

D.C. Inverter Multi-variable Modular
16
GMV-1800WM/B-X No need to enlarge pipe size Φ25.4
(4) If the length between an IDU and its nearest branch is above 10m, then increase the size of
the liquid pipe of IDU (only for the pipe size that is≤6.35mm).
4.2.4 Connection Pipe among Outdoor Modules
H＞0m
×
Outdoor
unit
Outdoor
unit
Outdoor
unit
There should be no height
drop among outdoor units.
Fig.19
≥0.2m
≥0.25m
H=0m
≤2m
B
A
Outdoor
unit
Outdoor
unit
Outdoor
unit
Fig.20
Note: When the distance between outdoor units exceeds 2m, U-type oil trap should be added at
low-pressure gas pipe. A+B 10m.
4.2.5 Fitting pipe between Outdoor Unit and the First Manifold
4.2.5.1 For single module system, pipe size (between outdoor unit and the rst manifold)is
determined by that of outdoor unit.
The 1st
branch section
Outdoor unit
Fitting pipe between outdoor unit
and the first indoor manifold
Fig.21

D.C. Inverter Multi-variable Modular
17
Pipe size of basic outdoor module is shown as follows:
Basic Module Pipe between ODU and the rst branch of IDU
Gas Pipe(mm) Liquid Pipe(mm)
GMV-224WM/B-X Φ19.05 Φ9.52
GMV-280WM/B-X Φ22.2 Φ9.52
GMV-335WM/B-X Φ25.4 Φ12.7
GMV-400WM/B-X Φ25.4 Φ12.7
GMV-450WM/B-X Φ28.6 Φ12.7
4.2.5.2 For multi-module unit, select appropriate manifold connected to oudoor module as
per the pipe size of basic module. Pipe size of basic outdoor module is shown as follows:
Outdoor unit1 Outdoor unit2 Outdoor unit3
Fitting pipe between module
and outdoor manifold
Outdoor manifold
Fig.22
Basic Module Pipe between module and branch of ODU
Gas Pipe(mm) Liquid Pipe(mm)
GMV-224WM/B-X Φ19.05 Φ9.52
GMV-280WM/B-X Φ22.2 Φ9.52
GMV-335WM/B-X Φ25.4 Φ12.7
GMV-400WM/B-X Φ25.4 Φ12.7
GMV-450WM/B-X Φ28.6 Φ12.7
Select the branch of outdoor module
Module’s capacity (C) Model
Select the branch of outdoor
module 504≤C ML01/A