DC Inverter VRF Units
DC Inverter VRF Units
Owner's Manual
Air Conditioners
GMV-72WM/B-F(U)
GMV-96WM/B-F(U)
GMV-120WM/B-F(U)
GMV-144WM/B-F(U)
GMV-360WM/B-F(U)
 Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference.
Preface
AC PRO 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.
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.
This mark indicates procedures which, if improperly performed, might lead to the
death or serious injury of the user.
This mark indicates procedures which, if improperly performed, might possibly
result in personal harm to the user, or damage to property.
NOTICE is used to address practices not related to personal injury.
(1) Instructions for installation and use of this product are provided by the manufacture r.
(2) Installation must be performed in accordance with the requirements of NEC and CEC by authorized
personnel only.
(3) For safety operation, please strictly follow the instructions in this manual.
(4) 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.
(5) This manual must be in the hands of direct operators or maintenance men.
(6) 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 occur s)
(7) All units have been strictly tested and proved to be qualified 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.
(8) 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.
(9) If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly
qualified persons in order to avoid a hazard.
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.
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 ............................................................. 5
3.1 Standard Parts ................................................................................................................................ 5
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 ........................................................................................................................... 13
4.3 Installation of the Connection Pipe ............................................................................................ 24
4.4 Air Purging and Refrigerant Charge .......................................................................................... 30
4.5 Electric Wiring............................................................................................................................... 33
4.6 System Communication .............................................................................................................. 37
4.7 Connection Method and Steps for System Communication .................................................. 41
4.8 External Electrical Wiring Diagram ............................................................................................ 47
5 Check Items after Installation and Trial Run ....................................... 49
5.1 Check Items after Installation ..................................................................................................... 49
5.2 Trial Run ........................................................................................................................................ 49
6 Common Malfunction and Troubleshooting ........................................ 64
7 Error Indication ................................................................................... 65
8 Maintenance and Care ....................................................................... 69
8.1 Outdoor Heat Exchanger ............................................................................................................ 69
8.2 Drain Pipe ..................................................................................................................................... 69
8.3 Notice before Seasonal Use....................................................................................................... 70
8.4 Maintenance after Seasonal Use .............................................................................................. 70
8.5 Parts Replacement ...................................................................................................................... 70
9 After-sales Service ............................................................................. 70
GMV DC Inverter VRF
1 Safety Precautions
(1) Follow this instruction to complete the installation work. Please carefully read this manual before unit
startup and service.
(2) Wire size of power cord should be large enough. The damaged power cord and connection wire should be
replaced by exclusive cable.
(3) After connecting the power cord, please fix the electric box cover properly in order to avoid accident.
(4) Never fail to comply with the nitrigen charge requirements. Charge nitrogen when welding pipes.
(5) Never short-circiut or cancel the pressure switch to prevent unit damage.
(6) Please firstly connect the wired controller before energization, otherwise wired controller cannot be used.
(7) Before using the unit, please check if the piping and wiring are correct to avoid water leakage, refrigerant
leakage, electric shock, or fire etc..
(8) Do not insert fingers or objects into air outlet/inlet grille.
(9) 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.
(10) Never start up or shut off the air conditioner by means of directly plug or unplug the power cord.
(11) Turn off the unit after it runs at least five minutes; otherwise it will influence oil return of the compressor.
(12) Do not allow children operate this unit.
(13) Do not operate this unit with wet hands.
(14) Turn off the unit or cut off the power supply before cleaning the unit, otherwise electric shock or injury
may happen.
(15) Never spray or flush water towards unit, otherwise malfunction or electric shock may happen.
(16) Do not expose the unit to the moist or corrosive circumstances.
(17) Under cooling mode, please don't set the room temperature too low and keep the temperature difference
between indoor and outdoor unit within 5ºC(41ºF).
(18) User is not allowed to repair the unit. Fault service may cause electric shock or fire accidents. Please
contact AC PRO appointed service center for help.
(19) 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.
(20) 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..
(21) Be sure to use the exclusive accessory and part to prevent the water leakage, electric shock and fire
accidents.
(22) 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.
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GMV DC Inverter VRF
(23) 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).
(24) If refrigerant leakage happens during installation, please ventilate immediately. Poisonous gas will
emerge if the refrigerant gas meets fire.
(25) 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.
(26) If anything abnormal happens (such as burning smell), please power off the unit and cut off the m ain
power supply, and then immediately contact AC PRO appointed service center. If abnormality keeps going,
the unit might be damaged and lead to electric shock or fire.
AC PRO 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.
2
GMV DC Inverter VRF
2 Product Introduction
AC PRO 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 72kBtu/h to
360kBtu/h, which can be widely used in working area and especially applicable to the place with
variable load change. AC PRO air conditioner is absolutely your best choice.
2.1 Names of Main Parts
Fig.1
NO.
①
②
③
④
⑤
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-144WM/B-F(U)
GMV-168WM/B-F(U)
GMV-192WM/B-F(U)
Model
(Combined)
GMV-72WM/B-F(U)
+ GMV-72WM/B-F(U)
GMV-72WM/B-F(U)
+ GMV-96WM/B-F(U)
GMV-96WM/B-F(U)
+ GMV-96WM/B-F(U)
Model
(Single)
GMV-216WM/B-F(U)
GMV-240WM/B-F(U)
GMV-264WM/B-F(U)
Model
(Combined)
GMV-96WM/B-F(U)
+ GMV-120WM/B-F(U)
GMV-120WM/B-F(U)
+ GMV-120WM/B-F(U)
GMV-72WM/B-F(U)
+ GMV-96WM/B-F(U)
+ GMV-96WM/B-F(U)
3
GMV DC Inverter VRF
Model
(Single)
GMV-288WM/B-F(U)
GMV-312WM/B-F(U)
GMV-336WM/B-F(U)
Model
(Combined)
GMV-96WM/B-F(U)
+ GMV-96WM/B-F(U)
+ GMV-96WM/B-F(U)
GMV-96WM/B-F(U)
+ GMV-96WM/B-F(U)
+ GMV-120WM/B-F(U)
GMV-96WM/B-F(U)
+ GMV-120WM/B-F(U)
+ GMV-120WM/B-F(U)
Model
(Single)
GMV-360WM/B-F(U)
Model
(Combined)
GMV-120WM/B-F(U)
+ GMV-120WM/B-F(U)
+ GMV-120WM/B-F(U)
2.3 Combinations of Indoor and Outdoor Units
ODU Model
Max number of
connectable IDU
(unit)
ODU Model
Max number of
connectable IDU (unit)
GMV-72WM/B-F(U)
12
GMV-216WM/B-F(U)
37
GMV-96WM/B-F(U)
16
GMV-240WM/B-F(U)
41
GMV-120WM/B-F(U)
20
GMV-264WM/B-F(U)
45
GMV-144WM/B1-F(U)
25
GMV-288WM/B-F(U)
49
GMV-144WM/B-F(U)
25
GMV-312WM/B-F(U)
53
GMV-168WM/B-F(U)
29
GMV-336WM/B-F(U)
58
GMV-192WM/B-F(U)
33
GMV-360WM/B-F(U)
61
The total capacity of indoor units should be within 50%~135% of that of outdoor units.
Fig.2
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GMV DC Inverter VRF
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: -5ºC(23ºF)~52ºC(125.6ºF)
Heating
Ambient temperature: -20ºC (-4ºF)~24ºC (75.2ºF)
When the indoor units are all VRF fresh air processor, the unit operating range is as follows:
Cooling
Ambient temperature: 16°C(60.8℉)~45°C(113℉)
Heating
Ambient temperature: -7°C(19.4℉)~16°C(60.8℉)
NOTICE! Out of the working Temperature Range may damage this product and will invalidate
the warranty.
3 Preparation before Installation
NOTICE! The picture is only used for reference and the actual product prevails. Unit: mm(in.).
3.1 Standard Parts
Please use the following standard parts supplied by AC PRO.
Parts for Outdoor Unit
Number
Name
Picture
Quantity
Remarks
DC Inverter VRF Units
Owner's Manual
Air Conditioners
1
Owner's Manual
1
GMV-72WM/B-F(U)
GMV-96WM/B-F(U)
GMV-120WM/B-F(U)
GMV-144WM/B-F(U)
GMV-360WM/B-F(U)
 Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference.
2
Wiring (match with
resistance)
1
Must be connected to the last
IDU of communication
connection
3
Mark (Master )
2
Attach on the wired controller of
master IDU or on the front panel
5
GMV DC Inverter VRF
3.2 Installation Site
(1) 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.
(2) Never expose the unit under direct sunshine and rainfall. Install the unit at a place where is against dust,
typhoon and earthquake.
(3) Try to keep the unit away from combustible, inflammable and corrosive gas or exhaust gas.
(4) Leave some space for heat exchanging and servicing so as to guarantee unit normal operation.
(5) Keep the indoor and outdoor units close to each other as much as possible so as to decrease the pipe
length and bends.
(6) Never allow children to approach to the unit and take measures to prevent children touching the unit.
3.2.1 When the outdoor unit is totally surrounded by walls, please refer to following
figures for space dimension.
3.2.1.1 Space dimension for single-module unit
Unit: mm(in.)
Fig.3
3.2.1.2 Space dimension for dual-module unit
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GMV DC Inverter VRF
Unit: mm(in.)
Fig.4
3.2.1.3 Space dimension for three-module unit
Unit: mm(in.)
Fig.5
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 3000mm(118-1/8in.) 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(59in.) or above (See Fig.6).
When space is limited within 1500mm(59in.) 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.7).
7
GMV DC Inverter VRF
Unit: mm(in.)
Fig.6
Fig.7
3.2.3 Space dimension for multiple-module unit
For keeping good ventilation, make sure there is no obstruction 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.
Unit: mm(in.)
Fig.8
Fig.9
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GMV DC Inverter VRF
3.2.4 Considering the seasonal wind in outdoor unit installation
Anti-monsoon installation requirement for unit not connecting exhaust duct
Fig.10
Fig.11
Anti-monsoon installation requirement for unit connecting exhaust duct
Fig.12
9
GMV DC Inverter VRF
3.2.5 Considering snow in outdoor unit installation
Fig.13
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(in.)
Wall Thickness mm(in.)
Type
Φ6.35(1/4)
≥0.8(1/32)
0
Φ9.52(3/8)
≥0.8(1/32)
0
Φ12.7(1/2)
≥0.8(1/32)
0
Φ15.9(5/8)
≥1.0(3/76)
0
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
Φ34.9(1-3/8)
≥1.3(2/39)
1/2H
Φ41.3(1-5/8)
≥1.5(1/17)
1/2H
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GMV DC Inverter VRF
4 Installation Instruction
4.1 Physical Dimension of the Outdoor Unit and Mounting Hole
Outline and Physical Dimention of GMV-72WM/B-F(U).
Unit: mm(in.)
Fig.14
11
GMV DC Inverter VRF
Outline and Physical Dimention of GMV-96WM/B-F(U)、GMV-120WM/B-F(U) and
GMV-144WM/B1-F(U) unit.
Unit: mm(in.)
Fig.15
12
GMV DC Inverter VRF
4.2 Connection Pipe
4.2.1 Schematic Diagram of Piping Connection
Fig.16
13
GMV DC Inverter VRF
4.2.2 Schematic Diagram of Piping Sequence
GMV-72WM/B-F(U)
Fig.17
GMV-96WM/B-F(U) 、GMV-120WM/B-F(U) and GMV-144WM/B1-F(U).
Fig.18
14
GMV DC Inverter VRF
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 figure below.
Remark: Equivalent length of one Y-type manifold is about 0.5m(1-3/4ft.).
Unit: m(ft.)
Fig.19
L10: Length from the first branch to the farthest IDU;
L11: Length from the first branch to the nearest IDU;
15
GMV DC Inverter VRF
Equivalent length of branch of IDU is 0.5m(1-3/4ft.).
.
R410A Refrigerant System
Allowable Value
m(ft.)
Fitting Pipe
Total length (actual length) of fitting pipe
≤1000(3280-3/4)
L1+L2+L3+L4+…+L9+a+b+…+i+j
Length of farthest
fitting pipe m(ft.)
Actual length
≤165(541-1/4)
Equivalent length
≤190(623-1/4)
L1+L6+L7+L8+L9+j
Difference between the pipe length from the
first branch of IDU to the farthest IDU and the
pipe length from the first branch of IDU to the
nearest IDU
≤40(131-1/4)
L10-L11
Equivalent length from the first branch to the
furthest piping (1)
≤40(131-1/4)
L6+L7+L8+L9+j
Height difference
Outdoor unit at upper(2)
between outdoor unit
Outdoor unit at lower(2)
and indoor unit
≤90(295-1/4)
——
≤90(295-1/4)
——
Height difference between indoor units
≤30(98-2/4)
——
Maximum length of Main pipe(3)
<90(295-1/4)
L1
From IDU to its nearest branch (4)
≤40(131-1/4)
a,b,c,d,e,f,g,h,i,j
(1) Normally, the pipe length from the first branch of IDU to the farthest IDU is 40m(131-1/4ft.).
Under the following conditions, the length can reach 90m(295-1/4ft.).
1) Actual length of pipe in total: L1+L2x2+L3x2+L4x2+…+L9x2+a+b+…+i+j≤1000m(32803/4ft.).
2) Length between each IDU and its nearest branch a, b, c, d, e, f, g, h, i, j≤40m(1311/4ft.).
3) Difference between the pipe length from the first branch of IDU to the farthest IDU and the
pipe length from the first branch of IDU to the nearest IDU: L10-L11≤40m(131-1/4ft.).
(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 first branch of IDU
is≥90m(295-1/4ft.), 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(in.)
Liquid pipe size mm(in.)
GMV-72WM/B-F(U)
No need to enlarge pipe size
No need to enlarge pipe size
GMV-96WM/B-F(U)
No need to enlarge pipe size
Φ12.7(1/2)
GMV-120WM/B-F(U)
No need to enlarge pipe size
Φ15.9(5/8)
GMV-144WM/B1-F(U)
Φ34.9(1-3/8)
Φ15.9(5/8)
GMV-144WM/B-F(U)
Φ34.9(1-3/8)
Φ15.9(5/8)
GMV-168WM/B-F(U)
Φ34.9(1-3/8)
Φ19.05(3/4)
GMV-192WM/B-F(U)
Φ34.9(1-3/8)
Φ19.05(3/4)
16
GMV DC Inverter VRF
Outdoor Model
Gas pipe size mm(in.)
Liquid pipe size mm(in.)
GMV-216WM/B-F(U)
Φ34.9(1-3/8)
Φ19.05(3/4)
GMV-240WM/B-F(U)
No need to enlarge pipe size
Φ19.05(3/4)
GMV-264WM/B-F(U)
No need to enlarge pipe size
Φ22.2(7/8)
GMV-288WM/B-F(U)
No need to enlarge pipe size
Φ22.2(7/8)
GMV-312WM/B-F(U)
No need to enlarge pipe size
Φ22.2(7/8)
GMV-336WM/B-F(U)
No need to enlarge pipe size
Φ22.2(7/8)
GMV-360WM/B-F(U)
No need to enlarge pipe size
Φ22.2(7/8)
(4) If the length between an IDU and its nearest branch is above 10m(32-4/5ft.), then increase
the size of the liquid pipe of IDU (only for the pipe size that is≤6.35mm(1/4in.).
4.2.4 Connection Pipe among Outdoor Modules
Fig.20
17
GMV DC Inverter VRF
Unit: m(ft.)
Fig.21
NOTICE! When the distance between outdoor units exceeds 2m (6-1/2ft.), U-type oil trap
should be added at low-pressure gas pipe. A+B≤10m (32-7/8ft.).
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 first
manifold) is determined by that of outdoor unit.
Fig.22
18
GMV DC Inverter VRF
Pipe size of basic outdoor module is shown as follows:
Pipe between ODU and the first branch of IDU
Basic Module
Gas Pipe mm(in.)
Liquid Pipe mm(in.)
GMV-72WM/B-F(U)
Φ19.05(3/4)
Φ9.52(3/8)
GMV-96WM/B-F(U)
Φ22.2(7/8)
Φ9.52(3/8)
GMV-120WM/B-F(U)
Φ28.6(1-1/8)
Φ12.7(1/2)
GMV-144WM/B1-F(U)
Φ28.6(1-1/8)
Φ12.7(1/2)
4.2.5.2 For multi-module unit, select appropriate manifold connected to outdoor
module as per the pipe size of basic module. Pipe size of basic outdoor module is
shown as follows:
Fig.23
Pipe between module and branch of ODU
Basic Module
Gas Pipe mm(in.)
Liquid Pipe mm(in.)
GMV-72WM/B-F(U)
Φ19.05(3/4)
Φ9.52(3/8)
GMV-96WM/B-F(U)
Φ22.2(7/8)
Φ9.52(3/8)
GMV-120WM/B-F(U)
Φ28.6(1-1/8)
Φ12.7(1/2)
GMV-144WM/B1-F(U)
Φ28.6(1-1/8)
Φ12.7(1/2)
Module’s capacity C (kBtu/h)
Model
144≤C
ML01/A
Select the branch of outdoor module
Select the branch of outdoor
module
19
GMV DC Inverter VRF
4.2.5.3 Fitting pipe between two manifolds from basic modules
Pipe size (between two manifolds from basic modules) is based on the total capacity of
upstream modules.
Fig.24
Total capacity of upstream modules
Q(Btu/h)
Pipe size between manifolds
Gas pipe size mm(in.)
Liquid pipe size mm(in.)
144000
Φ28.6(1-1/8)
Φ12.7(1/2)
168000
Φ28.6(1-1/8)
Φ15.9(5/8)
192000
Φ28.6(1-1/8)
Φ15.9(5/8)
216000
Φ28.6(1-1/8)
Φ15.9(5/8)
240000
Ф34.9(1-3/8)
Φ15.9(5/8)
20
GMV DC Inverter VRF
4.2.5.4 Fitting pipe between the first manifold from indoor unit and the end manifold
from outdoor unit
Single module unit
Fig.25
Basic Module
Pipe between ODU and the first branch of IDU
Gas Pipe mm(in.)
Liquid Pipe mm(in.)
GMV-72WM/B-F(U)
Φ19.05(3/4)
Φ9.52(3/8)
GMV-96WM/B-F(U)
Φ22.2(7/8)
Φ9.52(3/8)
GMV-120WM/B-F(U)
Φ28.6(1-1/8)
Φ12.7(1/2)
GMV-144WM/B1-F(U)
Φ28.6(1-1/8)
Φ12.7(1/2)
For multiple modules, the piping from ODU to the first branch of IDU is based on the total
rated capacity of outdoor modules.
Fig.26
21
GMV DC Inverter VRF
Total rated capacity of outdoor
modules (multi-modular system)
Pipe between ODU and the first branch of IDU
Gas pipe size mm(in.)
Liquid pipe size mm(in.)
GMV-144WM/B-F(U)
Φ28.6(1-1/8)
Φ12.7(1/2)
GMV-168WM/B-F(U)
Φ28.6(1-1/8)
Φ15.9(5/8)
GMV-192WM/B-F(U)
Φ28.6(1-1/8)
Φ15.9(5/8)
GMV-216WM/B-F(U)
Φ28.6(1-1/8)
Φ15.9(5/8)
GMV-240WM/B-F(U)
Ф34.9(1-3/8)
Φ15.9(5/8)
GMV-264WM/B-F(U)
Ф34.9(1-3/8)
Ф19.05(3/4)
GMV-288WM/B-F(U)
Ф34.9(1-3/8)
Ф19.05(3/4)
GMV-312WM/B-F(U)
Ф34.9(1-3/8)
Ф19.05(3/4)
GMV-336WM/B-F(U)
Ф34.9(1-3/8)
Ф19.05(3/4)
GMV-360WM/B-F(U)
Ф41.3(1-5/8)
Ф19.05(3/4)
4.2.5.5 Manifold at indoor unit side
Manifold at indoor unit side can be selected as per total capacity of downstream indoor unit(s).
Refer to the following table.
Fig. 27(a)
Fig.27(b)
22
GMV DC Inverter VRF
R410A Refrigerant System
Y-type Manifold
T- type Manifold
Total capacity of downstream
indoor unit(s) C (KBtu/h)
Model
C<68
FQ01A/A
68≤C≤102
FQ01B/A
102<C≤239
FQ02/A
239<C
FQ03/A
C≤136
FQ014/H1
136<C≤232
FQ018/H1
232<C
FQ018/H2
4.2.5.6 Fitting pipe between manifolds
Pipe size (between two manifolds at indoor unit side) is based on the total capacity of
upstream indoor unit(s).
Fig.28
Dimension of the pipe of indoor branch
Total capacity of downstream indoor
unit(s) C(Btu/h)
Gas Pipe mm(in.)
Liquid Pipe mm(in.)
C≤17100
Φ12.7(1/2)
Φ6.35(1/4)
17100<C≤48500
Φ15.9(5/8)
Φ9.52(3/8)
48500<C≤72000
Φ19.05(3/4)
Φ9.52(3/8)
72000<C≤96000
Φ22.2(7/8)
Φ9.52(3/8)
96000<C≤144000
Φ28.6(1-1/8)
Φ12.7(1/2)
144000<C≤216000
Φ28.6(1-1/8)
Φ15.9(5/8)
216000<C≤240000
Φ34.9(1-3/8)
Φ15.9(5/8)
240000<C≤336000
Φ34.9(1-3/8)
Φ19.05(3/4)
336000<C
Φ41.3(1-5/8)
Φ19.05(3/4)
23
GMV DC Inverter VRF
4.2.5.7 Fitting pipe between indoor unit and manifold
Manifold should be matched with fitting pipe of indoor unit.
Fig.29
Pipe between indoor branch and IDU
Rated capacity of indoor unit
C(Btu/h)
Gas Pipe mm(in.)
Liquid Pipe mm(in.)
C≤9500
Φ9.52(3/8)
Φ6.35(1/4)
9500<C≤17100
Φ12.7(1/2)
Φ6.35(1/4)
17100<C≤48500
Φ15.9(5/8)
Φ9.52(3/8)
48500<C≤72000
Φ19.05(3/4)
Φ9.52(3/8)
72000<C
Φ22.2(7/8)
Φ9.52(3/8)
4.3 Installation of the Connection Pipe
4.3.1 Precautions when installing the connection pipe
(1) Conform to the following principles during piping connection: Connection pipeline should be
as short as possible. The height difference between indoor and outdoor units should be as
short as possible. Keep number of bends as little as possible. The radius of curvature
should be as large as possible.
(2) Weld the connection pipes between indoor and outdoor unit. Please strictly conform to the
requirements for welding process. Rosin joints and pin holes are not allowable.
(3) When laying the pipes, be careful not to deform them. The radius of bending parts should
be more than 200mm(7-7/8in.). The pipes cannot be repeatedly bent or stretched,
otherwise the material will get harden. Do not bend or stretch the pipe over three times at
the same position.
(4) Please use a torque wrench to connect union nut on the indoor unit. See Fig. 30.
24
GMV DC Inverter VRF
Fig.30
1) Align the expansion end of copper pipe with the center of threaded joint. Tighten the flare
nuts with your hands.
2) Tighten the flare nuts with torque wrench until you hear "click" sound.
3) Use sponge to wrap the connecting pipe and joints without thermal insulation and tie it up
with plastic tape.
4) A mounting support for the connection pipe is required.
5) The curvature degree of connection pipe should not be small, otherwise the pipe might
crack. Installation personnel should use tube bender when bending the pipe.
6) Don't forbibly stretch the pipe joint, otherwise indoor capillary or other pipes might be
damaged and lead to refrigerant leakage.
4.3.2 Manifold
(1) Y-type manifold, See the Fig. 31(a). T-type manifold, See the Fig. 31(b).
Fig. 31(a)
25
GMV DC Inverter VRF
Fig. 31(b)
(2) Manifold has serveral pipe sections with different pipe size, which facilitates to match with
various copper pipe. Use pipe cutter to cut in the middle of the pipe section with different
pipe size and deburr as well. See Fig. 32.
Fig. 32
(3) Y-type manifold can be installed vertically or horizontally. Confirm the position and then
weld the manifold pipe. See the Fig. 33(a). T-type manifold must be installed horizontally
with inclination, see the Fig. 33(b).
Fig. 33(a)
26
GMV DC Inverter VRF
Fig. 33(b)
(4) Manifold is isolated by insulating material that can bear 120ºC(248℉)or higher temperature.
Manifold attached foam cannot be taken as insulating material.
4.3.3 Installation and thermal insulation for pipeline
(1) For multi VRF system, every copper pipe should be labeled so as to avoid misconnection.
(2) Manifolds can be laid in the following ways:
The length of a straight pipe between two manifolds cannot be less than 500 mm
(19-11/16in.). The length of a straight pipe before the main pipe port of the manifold cannot
be less than 500mm (19-11/16in.). The length of a straight pipe between the branch of the
manifold and the IDU cannot be less than 500mm(19-11/16in.). See Fig.34.
Unit: mm(in.)
27
GMV DC Inverter VRF
Fig.34
(3) There must be three fixing point for both horizontal and vertical installation of the Y-type
manifold. See Fig.35.
Fixing point 1: 100mm(4in) on the main inlet manifold from the welding point
Fixing point 2: 200mm(7-7/8in.) on the main branched pipe from the welding point
Fixing point 3: 250mm(9-5/6in.) on the branched pipe from the welding point
Unit: mm(in.)
Fig.35
(4) Suspend the header to the ceiling, and be sure to install the T-type manifold so that the
outlet pipes are horizontal at the lower side. See Fig.36.
28
GMV DC Inverter VRF
Fig.36
(5) Thermal insulation for pipeline
1) To avoid condensate or water leakage on connecting pipe, the gas pipe and liquid pipe
must be wrapped with thermal insulating material and adhesive pipe for insulation from
the air.
2) For heat pump unit, liquid pipe should bear 70ºC(158℉) or above, and gas pipe should
bear 120ºC(248℉) or above. For cooling only unit, both liquid pipe and gas pipe should
bear 70ºC(158℉) or above. Example: Polyethylene foam can bear 120ºC(248℉) above
and foaming polyethylene can bear 100ºC(212℉) above.
3) Joints at indoor and outdoor units should be wrapped with insulating material and leave
no clearance between pipe and wall. See Fig.37.
Fig.37
4) Manifold attached foam can not be taken as insulating material.
5) When wrapping the tape, the later circle should cover half of the former one. Don’t wrap
the tape so tightly, otherwise the insulation effect will be weakened.
6) After wrapping the pipe, adopt sealing material to completely fill the hole so as to prevent
wind and rain from entering the room.
29
GMV DC Inverter VRF
4.3.4 Support and protection for pipeline
(1) Support should be made for hanging connection pipe. Distance between each support can
not be over 1m(39-3/8in.).
(2) Protection towards accidental damage should be made for outdoor pipeline. When the
pipeline exceeds 1m(39-3/8in.), a pin. board should be added for protection.
4.4 Air Purging and Refrigerant Charge
4.4.1 Air purging
(1) Confirm outdoor liquid and gas valves are closed. Air puring from the nozzel located on
liquid and gas valves by vacuum pump.See Fig.38.
(2) When there are more than 2 outdoor units, air purging from the nozzel located on the oil
balance valve. Confirm outdoor oil balance valves are closed. See Fig.39.
Fig.38
Fig.39
4.4.2 Additional refrigerant charging
Outdoor unit has been charged refrigerant before delivery.
Charge additional refrigerant for field-installed connecting pipe. If the pipeline is longer than
1m(39-3/8in.), please refer to the following table for charging amount of refrigerant. (Liquid pipe
prevails)
How much additional refrigerant should be charged.
Total refrigerant charging amount R= Pipeline charging amount A + ∑charging amount B of
every module.
(1) Pipeline charging amount
Added refrigerant quantity A for piping = ∑Liquid pipe length × Added refrigerant quantity for
each meter(in.) of liquid pipe.
Diameter of liquid pipe
mm(in.)
28.6(1-1/8)
25.4(1)
22.2(7/8)
19.05(3/4)
15.9(5/8)
12.7(1/2)
9.52(3/8)
6.35(1/4)
kg/m
0.680
0.520
0.350
0.250
0.170
0.110
0.054
0.022
OZ/in.
0.61
0.47
0.31
0.22
0.15
0.10
0.05
0.02
30
GMV DC Inverter VRF
(2) ∑Refrigerant charging amount B of every module.
Refrigerant charging amount B of
every module kg(Pounds)
IDU/ODU rated
capacity
collocation ratio
C
Rated Capacity(1000Btu/h)
Quantity of
included
IDUs(N)
72
96
120
144
N<4
0
0
0
0
N≥4
0.5(1.1)
0.5(1.1)
0.5(1.1)
0.5(1.1)
N<4
1(2.2)
1(2.2)
1.5(3.3)
1.5(3.3)
8>N≥4
2(4.4)
2(4.4)
3(6.6)
3.5(7.7)
N≥8
4(8.8)
3.5(7.7)
4(8.8)
4.5(9.9)
N<4
2(4.4)
2(4.4)
2.5(5.5)
2.5(5.5)
8>N≥4
4(8.8)
3.5(7.7)
4(8.8)
4.5(9.9)
N≥8
4.5(9.9)
4.5(9.9)
5(11.0)
5.5(12.1)
50%≤C≤90%
90%<C≤105%
105%<C≤135%
(1) IDU/ODU rated capacity collocation ratio C = Sum of rated cooling capacity of indoor unit / Sum of rated
cooling capacity of outdoor unit.
(2) If all of the indoor units are fresh air indoor units, the quantity of r efrigerant added to each module is 0kg.
(3) If outdoor air processor is connected with normal VRF indoor unit, adopt the perfusion method for normal
indoor unit for perfusion.
For example1:
The OUD is composed of 3 modules: 72kBtu/h, 120 kBtu/h and 120 kBtu/h. The IDUs are
made up of 7sets of 48 kBtu/h.
IDU/ODU rated capacity collocation ratio C= 48×7/(72+120+120)=108%.The quantity of
included IDUs is more than 4 sets. Please refer to the above table.
Refrigerant charging amount B for 72kBtu/h module is 4.0kg(8.8pounds).
Refrigerant charging amount B for 120 kBtu/h module is 4.0kg(8.8pounds).
Refrigerant charging amount B for 120 kBtu/h module is 4.0kg(8.8pounds).
So, Σ Refrigerant charging amount B of every module=4.0+4.0+4.0=12kg (8.8+8.8+8.8
=26.4pounds).
Suppose the Pipeline charging amount A=Σ Liquid pipe length × refrigerant charging amount
of every 1m (or 1in.) liquid pipe=25kg (55.1 pounds)
Total refrigerant charging amount R=25+12=37kg (55.1+26.4=81.5pounds).
For example 2:
Outdoor unit is a 72kBtu/h module and the indoor unit is a 72kBtu/h fresh air unit. The quantity
(B) of refrigerant added to this module is 0kg (0pounds).
So, ΣB (Quantity of refrigerant added to each module) = 0kg (0pounds).
Suppose that A (Quantity of refrigerant added to connection pipe) = ∑ Length of liquid pipe x
31
GMV DC Inverter VRF
Quantity of refrigerant added to liquid pipe per meter) = 5kg (11pounds).
R (Quantity of added refrigerant in total) = 5+0=5kg (11+0=11pounds).
Modular combination of outdoor unit subjects to combinations that is currently available.
After confirming that there is no leakage from the system, when the compressor is not in
operation, charge additional R410A with specified amount to the unit through the filling opening of
the liquid pipe valve of the outdoor unit. If required additional refrigerant cannot be quickly filled for
increase of pressure in the pipe, set the unit at cooling startup and then fill the refrigerant from gas
valve of outdoor unit. If ambient temperature is low, the unit can’t be set to cooling mode but
heating mode.
4.4.3 Precautions on Refrigerant Leakage
(1)Personnel related to air conditioning engineering design and installation operators must
abide by the safety requirement for preventing refrigerant leakage specified in local laws and
regulations.
(2)The units adopt the R410A refrigerant, which is nonflammable and nontoxic. However, the
space for refrigerant leakage must be sufficient to ensure that the refrigerant concentration does
not exceed that specified in the safety requirement; otherwise, people involved can be stifled by
the refrigerant. For example the maximum allowed concentration level of refrigerant to a humanly
space for R410A according to the appropriate European Standard is limited to 0.44 kg/m3.
The maximum amount of refrigerant (kg) in the system = The volume of the room (m3) ×The
maximum allowed concentration level of refrigerant (kg/m3)
Total amount of refrigerant (kg) in the system = Total additional charging amount (kg) +
Amount of refrigerant (kg) which is charged before leaving the factory (for the system consisting of
multiple modules in parallel, the accumulative charge quantity of modules before leaving the
factory is used)
Total amount of refrigerant (kg) in the system ≤The maximum amount of refrigerant (kg) in the
system
(3)When the total amount of refrigerant in the system is more than the maximum amount of
refrigerant, the cooling system should be designed again. In this case, the cooling system can also
be separated into several cooling systems with small capacity, or add corresponding ventilation
measures or alarming display.
①
②
Flow direction of refrigerant leakage.
Room for refrigerant leakage. Since the concentration of refrigerant is greater than that of air,
pay attention to the spaces where the refrigerant may residue, for example, the basement.
32
GMV DC Inverter VRF
4.5 Electric Wiring
4.5.1 Wiring precautions
(1) Wiring should conform to national rules. All the parts, materials, electric work should be in accordance
with local codes.
(2) Rated voltage and exclusive power supply should be used.
(3) Power cord should be fixed soundly and reliable. Never forcibly pull the power cord.
(4) Wire size of power cord should be large enough. The damaged power cord and connecting wire should be
replaced by exclusive cable.
(5) All the electrical work should be performed by professional personnel as per local law, regulation and this
manual.
(6) Connect the unit to the special earthing device and make sure the unit is earthed soun dly.
(7) Air switch and circuit breaker is required to be set. Air switch should have both magnetic trip and thermal
trip functions so as to protect the unit when short-circuit and overload happens. D-type breaker is adviced
to be used.
(8) Wiring diagram attatched on the unit is prevailed.
4.5.2 Wiring of power cord
Every unit should have corresponding short-circuit and overload protection. And also a main
switch is required to control power supply or disconnection. See Fig.40.
Fig.40
33
GMV DC Inverter VRF
Outdoor Unit
A
Minimum Circuit
Ampacity
A
Maximum Overcurrent
Protection
A
45
30
45
Power Supply
Fuse Capacity
V/ Ph /Hz
GMV-72WM/B-F(U)
208V/230V 3~ 60Hz
Outdoor units
GMV-96WM/B-F(U)
208V/230V 3~ 60Hz
70
45
70
GMV-120WM/B-F(U)
208V/230V 3~ 60Hz
100
74
100
GMV-144WM/B1-F(U)
208V/230V 3~ 60Hz
70
55
70
GMV-144WM/B-F(U)
208V/230V 3~ 60Hz
70
55
70
GMV-168WM/B-F(U)
208V/230V 3~ 60Hz
90
70
90
GMV-192WM/B-F(U)
208V/230V 3~ 60Hz
125
99
125
GMV-216WM/B-F(U)
208V/230V 3~ 60Hz
125
111
125
GMV-240WM/B-F(U)
208V/230V 3~ 60Hz
150
140
150
GMV-264WM/B-F(U)
208V/230V 3~ 60Hz
150
123
150
GMV-288WM/B-F(U)
208V/230V 3~ 60Hz
150
136
150
GMV-312WM/B-F(U)
208V/230V 3~ 60Hz
175
164
175
GMV-336WM/B-F(U)
208V/230V 3~ 60Hz
200
177
200
GMV-360WM/B-F(U)
208V/230V 3~ 60Hz
225
205
225
(1) Specification of circuit breaker and power cord is selected on the basis of unit’s maximum power (max.
current).
(2) Specification of power cord is based on the working condition where ambient temperature is 40 ºC (104
℉) and multi-core cable with copper conductor(working temperature is 90 ºC (194℉), e.g. power cable
with YJV cross-linked copper, insulated PE and PVC sheath) is lying on the surface of slot. If working
condition is different, please adjust the specification according to national stan dard.
(3) Copper-core cable must be used.
(4) The above sectional area is suitable for a maximum distance of 15m(49 -1/5ft.). If it’s over 15m(49-1/5ft.),
sectional area must be expanded to prevent overload current from burning the wire or causing fire ha zard.
(5) Specification of circuit breaker is based on the working condition where the ambient temperature of circuit
breaker is 40ºC(104℉). If working condition is different, please adjust the specification according to
national standard.
(6) The air switch should include magnetic trip function and thermal trip function so that system can be
protected from short circuit and overload.
(7) An all-pole disconnection switch having a contact separation of at least 3mm(1/8 in.) in all poles should be
connected in fixed wiring.
34
GMV DC Inverter VRF
4.5.3 Connection of power cord
(1) Before obtaining access to terminals, all supply circuits must be disconnected .
(2) If units are type I electrical appliances, they must be reliably grounded.
(3 Ground resistance must be in accord with requirements of local standard.
(4) The green-yellow wire within units are ground wire. Do not use it for other purposes. Nor sh ould it be cut
off or secured by tapping screws. Otherwise, it may cause electric shock.
(5) Power supply at user side must have reliable ground terminal. Do not connect ground wire to the following
places:
1) Water pipe.
2) Gas pipe.
3) Drainage pipe.
4) Other places that are considered by professionals as unreliable.
(6) Power cord and communication wire should be separated, with a distance of more than 20cm(7 -7/8in.).
Otherwise, system’s communication may not work well.
Steps and graphic of power cord connection:
(1) Knock off the cross-through opening that’s used for leading the external power cord, with
the cross-through rubber ring on the opening. Then lead the cable through the opening.
Connect L1, L2, L3 of power cord and ground wire separately to the positions on wiring
board (for power supply) that are marked with L1, L2, L3 and the ground screw nearby.
(2) Use cable ties to tie the cable securely.
(3) Lead the power cord as instructed in the graphic below:
35
GMV DC Inverter VRF
Fig. 41
36
GMV DC Inverter VRF
4.6 System Communication
4.6.1 Communication system include:
(1) Communication among outdoor basic modules.
(2) Communication between ODU and IDU.
(3) Communication among IDUs.
(4) Communication between IDU and wired controller.
(5) Connection between IDU and light board receiver.
(6) Communication between different refrigeration systems.
(7) Graphics of general communication connection.
Fig.42
4.6.2 Communication mode of GMV DC Inverter Units
CAN bus mode is taken for communication between IDU and ODU and communication
among IDUs.
37
GMV DC Inverter VRF
4.6.3 Selection and connection mode of GMV5 communication material
4.6.3.1Select communication material
NOTICE! If air conditioners are installed at places where there’s strong electromagnetic
interference, the communication wire of IDU and wired controller must use shielded wire and the
communication wire between IDU and IDU/ODU must use shielded twisted pair.
(1)Select communication wire between IDU and wired controller
Material type
Light/Ordinary
polyvinyl chloride
sheathed cord.
Total length of
communication line
between IDU unit and
wired controller L m(ft.)
L≤250(820-1/5)
Wire size
Remarks
2×AWG18~
2×AWG16
1. Total length of communication line can't exceed
250m(820-1/5ft.).
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.
Graphic of connection between IDU and wired controller
Fig.43
(2)Select communication wire between ODU and IDU
Material Type
Light/Ordinary
polyvinyl chloride
sheathed cord.
Total Length L(m) of
Communication Cable
between IDU Unit and
IDU (ODU ) Unit m(ft.)
L≤1000(3280-5/6)
Wire size
Remarks
≥2×AWG18
1. If the wire diameter is enlarged to 2 ×AWG16,
the total communication length can reach
1500m(4921-1/4ft.).
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.
Fig.44
38
GMV DC Inverter VRF
NOTICE! All of the selected communication wire must be consistent with local laws and
regulations.
4.6.3.2 Connection mode of communication
(1) All communication wires of GMV5 must be connected in series rather than in star.
Fig.45
Fig.46
39
GMV DC Inverter VRF
Fig.47
(2) All communication wires of GMV5 are connected by screws.
Fig.48
(3) If a single communication wire is not long enough and needs to be connected, the
connected joint must be welded or pressure-welded. Do not simply twist the wires together.
4.6.4 Communication address
Auto addressing technology is adopted for GMV5 IDU and ODU. No need to set address
codes manually. Only the addresses of master unit and central control are needed to be set
(address of central control is only needed when there are multiple refrigeration systems).
NOTICE! When installing remote monitor or central controller, displacement on indoor units’
project codes must be made. Otherwise, there will be collision malfunction of the project codes.
For detail operation methods, please refer to the GMV5 Installation and Maintenance Manual.
40
GMV DC Inverter VRF
4.7 Connection Method and Steps for System Communication
4.7.1 Communication connection between IDU and ODU
NOTICE! The centralized controller can be installed when it is necessary.
Connect IDU and ODU via terminal D1/D2 of wiring board XT2. Below are the connection
graphics of single unit and modular units:
Fig.49 Connection of single unit
41
GMV DC Inverter VRF
Fig.50 Connection of modular unit
(1) For modular outdoor units, if there are multiple outdoor modules, then the master unit must be the first
outdoor module on the communication wire and should not connect with IDU (master unit is set by SA8 of
the outdoor main board).
(2) For modular outdoor units, if there are multiple outdoor modules, then indoor units must be connected with
the last slave module of ODU (slave module is set by SA8 of the outdoor main board).
(3) Communication wire and power cord must be separated.
(4) Communication wire must be of proper length. Extension is not allowed.
(5) IDUs must be connected in series. The last IDU must be connected with the communication matched
resistance (supplied in the list of ODU spare parts).
42
GMV DC Inverter VRF
4.7.2 Communication connection between IDU and wired controller
There are 4 kinds of connection between IDU and wired controller, as shown below:
Fig.51 One wired controller controls one IDU
Fig.52 Two wired controllers controls one IDU
Fig.53 One wired controller controls multiple IDUs
43
GMV DC Inverter VRF
Fig.54 Two wired controllers control multiple IDUs
When two wired controllers control multiple IDUs, the wired controller can be connected to
any one IDU, provided that the connected IDU is of the same series. Meanwhile, one and only one
of the wired controllers must be set as a slave controller. At most 16 IDUs can be controlled by
wired controllers and the connected IDUs shall be within a same IDU network.
No matter when unit is turned on or off, slave controller can be set.
How to set a slave controller: hold “function” button on the designated controller for 5s, and
temperature zone displays C00. Continue holding “function” button for 5s and setting screen of
controller parameter will come out. Default temperature zone displays P00.
Press
button or
button to select parameter code P13. Press “mode” button to switch
to setup of parameter values. Then the parameter value will blink. Press
button or
button
to select code 02. And then press “confirm/cancel” to finish setting.
Press “confirm/cancel” to return to the previous display until you exit from the setup of
parameter values.
Below are user’s parameter settings:
Parameter
code
Parameter
name
P13
Set up
address for
wired
controller
Parameter scope
Default
value
Remark
01
When 2 wired controllers control one or
more IDUs, they shall have different
addresses. Slave wired controller (02) can’t
set up units’ parameters except its own
address.
01: master wired
controller
02: slave wired
controller
4.7.3 Communication connection between duct type IDU and light board receiver
When the duct type IDU needs to be connected to light board remote receiver, it can be
connected via Dsp1 and Dsp2 on the IDU main board.
IDU type
Connection wire
Main board interface of corresponding IDU
Duct type IDU
Between boards (17-core)
Dsp1 (direct to 8-core interface)
Dsp2 (direct to 9-core interface)
44
GMV DC Inverter VRF
Fig.55
(1) Wired controller and light board remote receiver can be used at the same time.
(2) When light board remote receiver is used, please use remote controller at the same time.
4.7.4 Communication connection of central controlling units
NOTICE! The centralized controller can be installed when it is necessary.
Port connection G1 and G2 on the wiring board XT2 of master unit among each multi VRF
system (see below)
45
GMV DC Inverter VRF
Fig.56
46
GMV DC Inverter VRF
4.8 External Electrical Wiring Diagram
(1) Every unit should be equipped with a circuit breaker for short-circuit and overload protection. In general,
circuit breaker is at OFF status.
(2) During operation, all indoor units and outdoor units belonging to the same system must be kept energized
status. Otherwise, the unit can’t operate normally.
4.8.1 External wiring diagram of a single unit
Fig.57
NOTICE! Maximum number of IDU is based upon ODU capacity. For details, please refer to
the introduction of units’ combination.
47
GMV DC Inverter VRF
4.8.2 External wiring diagram of modular connection
Fig.58
NOTICE! Maximum number of ODU (N) and maximum number of IDU (n) are based upon the
combination type of ODU. For details, please refer to the introduction of units’ combination.
48
GMV DC Inverter VRF
5 Check Items after Installation and Trial Run
5.1 Check Items after Installation
Check Items
Conditions Might Happen
Has the unit been fixed firmly?
The unit may drop, shake or emit noise.
Have you done the gas leakage test?
It may cause insufficient cooling/heating
capacity.
Is the unit get proper thermal insulation?
It may cause condensation and dripping.
Does the unit drain well?
It may cause condensation and dripping.
Is the voltage in accordance with the rated
voltage specified on the nameplate?
It may cause malfunction or damage the part.
Is the electric wiring and piping connection
installed correctly and securely?
It may cause malfunction or damage the part.
Has the unit been earthed securely?
It may cause electrical leakage.
Is the power cord specified?
It may cause malfunction or damage the part.
Has the inlet and outlet been blocked?
It may cause insufficient cooling/heating
capacity.
Has the pipe length and refrigerant charging
amount been recorded?
The refrigerant charging amount is not
accurate.
Is the address code of outdoor modules correct?
The unit cannot run normally.
Communication malfunction might happen.
Is the address code of indoor units and wired
controller correct?
The unit cannot run normally.
Communication malfunction might happen.
Has the communication line been connected
correct?
The unit cannot run normally.
Communication malfunction might happen.
Is the piping connection and valve status right?
The unit cannot run normally.
Whether phase sequence of external power cord
is correct or not?
Operation failure occurs or unit is damaged.
Whether the engineering piping work and wiring
holes are sealed?
Maybe there are mice biting the wires, which
is the cause of malfunction.
Check
5.2 Trial Run
NOTICE! During debugging, one and only one module must be set as a master module.
During debugging, one and only one IDU must be set as a master IDU.
When no special requirement is needed, no need to set other functions. Unit can operate
according to ex-factory settings. When special requirement is needed, please read the Service
Manual or Debugging and Maintenance Manual.
5.2.1 Preparation before trial run
(1) The power supply should be turned on only after finishing all the installation.
(2) All the control wires and cables are connected correctly and safely. Completely open the
gas and liquid valves.
(3) All the objects like metal filing, thrum and clip should be cleared after installation.
49
GMV DC Inverter VRF
(4) Check if the unit appearance and piping system is damaged or not due to transportation.
(5) Check if the terminals of electrical element is loose and the phase sequence is correct or
not.
(6) Check the valve: For single-module unit, fully open the gas and liquid valve and close oil
balance valve; For dual/three module unit, fully open the gas, liquid valve and oil balance
valve.
5.2.2 Trial run
5.2.2.1 Notices
(1) Before test operation, make sure unit is power on and compressor has been preheated for
more than 8 hours. Touch the unit to check whether it’s normally preheated. Start test
operation after unit is normally preheated, otherwise compressor might be damaged.
Debugging must be performed by professional technicians or under the guide of
professional technicians.
Fig.59
(2) When debugging starts, system will operate according to the ambient temperature.
1) When outdoor temperature is above 20ºC(68°F), debugging shall be in cooling mode.
2) When outdoor temperature is below 20ºC(68°F), debugging shall be in heating mode.
(3) Before debugging, confirm again whether the cut-off valve of each basic module is fully
turned on.
(4) During debugging, front panel of the outdoor unit must be fully closed; otherwise,
debugging accuracy will be affected (see below).
50
GMV DC Inverter VRF
Fig.60
(5) Before debugging, make sure the needed amount of refrigerant has been added to the
pipe or at least 70% of the needed refrigerant has been added.
(6) Description of each stage of debugging progress:
Description of each stage of debugging progress
——
Debugging code Progress code
LED1
progress
01_Set up
master unit
02_Allocate
addresses
03_Confirm the
quantity of
modules
04_Confirm the
quantity of IDUs
Code
Display
status
db
Status code
LED2
LED3
Meaning
code
Display
status
Code
Display
status
light
01
light
A0
light
System is not debugged.
db
light
01
light
CC
light
System doesn’t have master unit. Reset
master unit.
db
light
01
light
CF
light
More than 2 master units are set. Reset
master unit.
db
light
01
light
OC
light
Master unit is successfully set. Start
next progress.
db
light
02
light
Ad
blink
System is allocating addresses.
db
light
02
light
L7
blink
Master IDU is not set. Please set
master IDU. If it’s not set in 1min,
system will set the master IDU
randomly.
db
light
02
light
OC
light
Allocation is finished. Start next
progress.
db
light
03
light
01~04
blink
LED3 displays the quantity of modules.
Confirm the number manually.
db
light
03
light
OC
light
System has confirmed the quantity of
modules. Start next progress.
db
light
04
light
01~80
blink
LED3 displays the quantity of IDUs.
Confirm the number manually.
db
light
04
light
OC
light
System has confirmed the quantity of
IDUs. Start next progress.
51
GMV DC Inverter VRF
Description of each stage of debugging progress
——
Debugging code Progress code
LED1
progress
05_Detect
internal
communication
06_Detect
outdoor
components
Code
Display
status
db
Status code
LED2
LED3
Meaning
code
Display
status
Code
Display
status
light
05
light
C2
light
System detects “driven communication
error between master unit and inverter
compressor”.
db
light
05
light
C3
light
System detects “driven communication
error between master unit and inverter
fan”.
db
light
05
light
CH
light
IDU/ODU “high proportion of rated
capacity”.
db
light
05
light
CL
light
IDU/ODU “low proportion of rated
capacity”.
db
light
05
light
OC
light
Detection is finished. Start next
progress.
db
light
06
light
Error
code
light
System detects error in outdoor
components.
db
light
06
light
OC
light
No error in outdoor components. Start
next progress.
db
light
07
light
XXXX
/Error
code
light
System detects error in indoor
components. XXXX is the project no. of
the faulted IDU. 3s later, relevant error
code is displayed. For example, IDU no.
100 has d5 error, then LED3 displays
like this: 01 (2s later) 00 (2s later) d5,
and repeat again.
db
light
07
light
OC
light
No error in indoor components. Start
next progress.
08_Confirm
preheated
compressor
db
light
08
light
U0
light
Preheat time for compressor is less
than 8h.
db
light
08
light
OC
light
Preheat time for compressor is 8h. Start
next progress.
09_Refrigerant
judgments
before startup
db
light
09
light
U4
light
System refrigerant is not enough.
System downtime equilibrium pressure
is lower than 0.3MPa(4-2/5psig).
db
light
09
light
OC
light
System refrigerant is normal. Start next
progress.
db
light
10
light
ON
light
Outdoor valves are being turned on.
db
light
10
light
U6
light
Outdoor valves are not fully turned on.
db
light
10
light
OC
light
Outdoor valves are turned on normally.
light
Calculate the refrigerant quantity
manually and confirm the perfusion
status of refrigerant (the quantity of
refrigerant added into the system must
be recorded accurately).
07_Detect indoor
components
10_Status
judgments of
outdoor valves
before startup
11_Calculate
refrigerant
quantity
manually
db
light
11
light
AE
52
GMV DC Inverter VRF
Description of each stage of debugging progress
——
Debugging code Progress code
LED1
progress
Code
Display
status
12_Confirm
debugging
startup
db
Status code
LED2
LED3
Meaning
code
Display
status
Code
Display
status
light
12
light
AP
blink
Ready for units to start debugging.
db
light
12
light
AE
light
Manual calculation of refrigerant
quantity is set up.
13_
——
——
——
——
——
——
no meaning.
14_
——
——
——
——
——
——
no meaning.
db
light
15
light
AC
light
Debugging is enabled in cooling mode
(debugging mode, auto-selected by
system).
db
light
15
light
Error
code
light
Error occurs during debugging in
cooling mode.
db
light
15
light
J0
light
Error of other modules occurs during
debugging in cooling mode.
db
light
15
light
U9
light
Outdoor pipeline and valves are not
normal.
15_Cooling
debugging
16_Heating
debugging
db
light
15
light
XXXX
/U8
light
System detects error in indoor pipeline.
XXXX is the project no. of the faulted
IDU. 3s later, error code U8 is
displayed. For example, IDU no. 100
has U8 error, then LED3 displays like
this: 01 (2s later) 00 (2s later) U8, and
repeat again.
db
light
16
light
AH
light
Debugging is enabled in heating mode
(debugging mode, auto-selected by
system).
db
light
16
light
Error
code
light
Error occurs during debugging in
heating mode.
db
light
16
light
J0
light
Error of other modules occurs during
debugging in heating mode.
db
light
16
light
U9
light
Outdoor pipeline and valves are not
normal.
light
System detects error in indoor pipeline.
XXXX is the project no. of the faulted
IDU. 3s later, error code U8 is
displayed. For example, IDU no. 100
has U8 error, then LED3 displays like
this: 01 (2s later) 00 (2s later) U8, and
repeat again.
light
Debugging is finished. System is on
standby condition. LED1 displays
module address. LED2 and LED3
display “OF”.
db
17_Debugging
finished
01~0
4
light
light
16
OF
light
light
XXXX
/U8
OF
53
GMV DC Inverter VRF
5.2.2.2 Debugging operation mode
GMV5 multi VRF system has two debugging modes: one is direct operation on main board of
outdoor units while the other is PC operation via special software. In PC software debugging,
indoor/outdoor parameters can be displayed and historical data can be recorded and inquired.
(Operation details can be found in relevant instruction manuals)
(1)Debugging through operation on main board of outdoor units
In this debugging mode, following debugging functions are included on the main board:
Step 1: front panel of the outdoor units must be fully closed. Open the debugging window of
each basic module;
Step 2: disconnect power for outdoor units. According to design requirements of external
static pressure, set up corresponding static pressure mode for the units. Setting methods can be
seen in Outdoor Fan Static Pressure Setup SA6_ESP_S;
Step 3: disconnect power for outdoor units and set one module as a master unit. Setting
methods can be seen in Master Unit Setup SA8_MASTER_S;
Step 4: Connect power for all indoor units. Make sure all IDUs are power on. Then all outdoor
modules will display “Debugging not enabled”;
Step 5: Find the module with “01” module address to be the master module. Hold SW7 button
on the master module for at least 5s to enable debugging;
Step 6: Wait. Unit will then start progress 01 and 02; in progress 01, if master unit is not
correctly set, progress 01 will show the following errors:
Progress
01_01 Set
up master
unit:
Debugging
Code
Progress Code
Status Code
LED1
LED2
LED3
Meaning
Code
Display
status
Code
Display
status
Code
Display
status
db
light
01
light
CC
light
System doesn’t have master unit. Reset
master unit.
db
light
01
light
CF
light
More than 2 master units are set. Reset
master unit.
db
light
01
light
OC
light
Master unit is successfully set. Start next
progress.
According to the above errors, reset the master unit as instructed in Master Unit Setup
SA8_MASTER_S. After reset is finished, start debugging again.
In progress 02, if master IDU is not detected, then progress 02 will show the following errors:
LED1
LED2
LED3
Function code
Display mode
Current
progress
Display mode
Current status
Display mode
db
light
02
light
L7
blink
At this time, all buttons are ineffective. Set master IDU in 1min via debugging software. If
master IDU is not set in 1min, system will set up a master IDU randomly. After that, system will
start next progress.
54
GMV DC Inverter VRF
Step 7: in progress 03, the quantity of modules needs to be confirmed manually. Main board
of each module will display:
Progress
03_Quantity of
modules
Debugging code
Progress code
Status code
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
db
light
03
light
Quantity of
modules
blink
If the quantity displayed is the same with actual quantity, then press SW7 confirmation button
on the master unit to confirm it. Unit will start next progress:
Progress
03_Confirm the
quantity of
modules
Debugging code
Progress code
Status code
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
db
light
03
light
OC
light
If the quantity displayed is different from actual quantity, then disconnect power and check
whether communication wire among each module is correctly connected. After the check, start
debugging again.
Step 8: in progress 04, the quantity of IDUs needs to be confirmed manually. Main board of
each module will display:
Progress
04_Confirm the
quantity of IDUs
Debugging code
Progress code
Status code
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
db
Light
04
Light
Quantity of
connected
IDUs
blink
If the quantity displayed is the same with actual quantity, then press SW7 confirmation button
on the master unit to confirm it. Unit will start next progress:
Progress
04_Confirm the
quantity of IDUs
Debugging code
Progress code
Status code
LED1
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
db
Light
04
Light
OC
Light
Step 9: progress 05 is “Detect internal communication”
If no error is detected, system will display as below and then start next progress.
55
GMV DC Inverter VRF
——
Debugging code Progress code
LED1
progress
05_Detect
internal
communication
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
05
Light
OC
Light
Meaning
Detection is finished. Start next
progress.
If error is detected, system will stay at current progress. Error has to be solved manually.
Below are relevant errors:
——
Debugging code Progress code
LED1
progress
05_Detect
internal
communication
Status code
LED2
LED3
Meaning
Code
Display
status
code
Display
status
Code
Display
status
db
Light
05
Light
C2
Light
System detects “driven communication
error between master unit and inverter
compressor”.
db
Light
05
Light
C3
Light
System detects “driven communication
error between master unit and inverter
fan”.
db
Light
05
Light
CH
Light
IDU/ODU “high proportion of rated
capacity”.
db
Light
05
Light
CL
Light
IDU/ODU “low proportion of rated
capacity”.
Elimination methods of above errors can be found in Troubleshooting.
Step 10: progress 06 is “Detect outdoor components”
If no error is detected, system will display as below and then start next progress.
——
Debugging code Progress code
LED1
progress
06_Detect
outdoor
components
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
06
Light
OC
Light
Meaning
No error is detected in outdoor
components. Start next progress.
If error is detected, system will stay at current progress. Error has to be solved manually.
Below is relevant error:
——
Debugging code Progress code
LED1
progress
06_Detect
outdoor
components
Code
db
Display
status
Light
Status code
LED2
code
06
LED3
Display
status
Code
Display
status
Light
Erro
r
cod
e
Light
56
Meaning
System detects error in outdoor
components.
GMV DC Inverter VRF
Elimination methods of above error can be found in Troubleshooting.
Step11: progress 07 is “Detect indoor components”
If no error is detected, system will display as below and then start next progress.
——
Debugging code Progress code
LED1
progress
07_Detect indoor
components
Status code
LED2
LED3
Meaning
Code
Display
status
code
Display
status
Code
Display
status
db
Light
07
Light
OC
Light
No error is detected in indoor
components. Start next progress.
If error is detected, system will stay at current progress. Error has to be solved manually.
Below is relevant error:
——
Debugging code Progress code
LED1
progress
07_Detect indoor
components
Code
db
Display
status
Light
Status code
LED2
code
07
LED3
Display
status
Code
Display
status
Light
XXXX
or
Error
code
Light
Meaning
System detects error in indoor
components.
XXXX is the project no. of the faulted IDU. 3s later, relevant error code is displayed. For
example, IDU no. 100 has d5 error, then LED3 displays like this: 01 (2s later) 00 (2s later) d5, and
repeat again.
Elimination methods of above error can be found in Troubleshooting.
Step 12: progress 08 is “Confirm preheated compressor”
If more than 8h of preheat time is detected, system will display as below and start next
progress.
——
Debugging code Progress code
LED1
progress
08_Confirm
preheated
compressor
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
08
Light
OC
Light
Meaning
Preheat time for compressor is 8h.
Start next progress.
If less than 8h of preheat time is detected, system will give error alarm and display as below.
Then press SW7 confirmation button to skip the wait time and start next progress. But this will
cause force start of the compressor, which may damage the compressor.
57
GMV DC Inverter VRF
——
Debugging code Progress code
LED1
progress
08_Confirm
preheated
compressor
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
08
Light
UO
Light
Meaning
Preheat time for compressor is less
than 8h.
Step 13: progress 09 is “Refrigerant judgments before startup”
If the refrigerant quantity inside the system meets the requirement of operation startup,
system will display as below and start next progress.
——
Debugging code Progress code
LED1
progress
09_Refrigerant
judgments
before startup
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
09
Light
OC
Light
Meaning
System refrigerant is normal. Start next
progress.
If there’s no or not enough refrigerant in the system to meet the requirement of operation
startup, system will display U4 “refrigerant shortage protection” and fails to start next progress.
Then check if there’s any leakage or add refrigerant inside until error eliminated.
——
Debugging code Progress code
LED1
progress
09_Refrigerant
judgments
before startup
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
09
Light
O4
Light
Meaning
System refrigerant is not enough.
System downtime equilibrium pressure
is lower than 0.3MPa(4-2/5psig).
Step 14: progress 10 is “Status judgments of outdoor valves before startup”
If master unit displays below, status judgments are enabled.
——
Debugging code Progress code
LED1
progress
10_Status
judgments of
outdoor valves
before startup
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
10
Light
ON
Light
58
Meaning
Outdoor valves are being turned on.
GMV DC Inverter VRF
If unit detects that valve status is not normal, it will display as below:
——
Debugging code Progress code
LED1
progress
10_Status
judgments of
outdoor valves
before startup
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
10
Light
U6
Light
Meaning
Outdoor valves are not fully turned on.
Then check the big and small valves whether they are fully turned on. After the check, press
SW6 return button to restart the judgments.
If unit detects that valve status is normal, it will display as below and start next progress.
——
Debugging code Progress code
LED1
progress
10_Status
judgments of
outdoor valves
before startup
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
10
Light
OC
Light
Meaning
Outdoor valves are turned on normally.
Step 15: progress 11 is “Calculate refrigerant quantity manually”
No need to operate. System will start next progress.
Step 16: progress 12 is “Confirm debugging startup”
In order to make sure all preparation work is done before startup, this step is designed for
user to confirm the startup again. Operate as below:
If master unit displays as below, system is waiting for confirmation signal.
——
Debugging code Progress code
LED1
progress
12_Status
judgments of
outdoor valves
before startup
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
12
Light
AP
Blink
59
Meaning
Ready for units to start debugging.
GMV DC Inverter VRF
If it’s confirmed, press SW7 confirmation button. Unit will display as below and start next
progress.
——
Debugging code Progress code
LED1
progress
12_Status
judgments of
outdoor valves
before startup
Status code
LED2
LED3
Code
Display
status
code
Display
status
Code
Display
status
db
Light
12
Light
AE
Light
Meaning
Manual calculation of refrigerant
quantity is set up.
Step 17: after unit is confirmed to start debugging, system select cooling/heating mode
according to ambient temperature.
A If cooling mode is selected, relevant display is as below:
——
Debugging code Progress code
LED1
progress
15_Cooling
debugging
Status code
LED2
LED3
Meaning
Code
Display
status
code
Display
status
Code
Display
status
db
Light
15
Light
AC
Light
Debugging is enabled in cooling mode
(debugging mode, auto-selected by
system).
db
Light
15
Light
Error
code
Light
Error occurs during debugging in
cooling mode.
db
Light
15
Light
J0
Light
Error of other modules occurs during
debugging in cooling mode.
db
Light
15
Light
U9
Light
Outdoor pipeline and valves are not
normal.
Light
System detects error in indoor
pipeline. XXXX is the project no. of
the faulted IDU. 3s later, error code
U8 is displayed. For example, IDU no.
100 has U8 error, then LED3 displays
like this: 01 (2s later) 00 (2s later) U8,
and repeat again.
db
Light
15
Light
XXXX
/U8
B If heating mode is selected, relevant display is as below:
——
Debugging code Progress code
LED1
progress
16_Heating
debugging
Status code
LED2
LED3
Meaning
Code
Display
status
code
Display
status
Code
Display
status
db
Light
16
Light
AE
Light
Debugging is enabled in heating
mode (debugging mode,
auto-selected by system).
db
Light
16
Light
Error
code
Light
Error occurs during debugging in
heating mode.
db
Light
16
Light
J0
Light
Error of other modules occurs during
debugging in heating mode.
60
GMV DC Inverter VRF
db
Light
db
Light
16
Light
16
Light
U9
XXXX
/U8
Light
Outdoor pipeline and valves are not
normal.
Light
System detects error in indoor
pipeline. XXXX is the project no. of
the faulted IDU. 3s later, error code
U8 is displayed. For example, IDU no.
100 has U8 error, then LED3 displays
like this: 01 (2s later) 00 (2s later) U8,
and repeat again.
Step 18: if there’s no error during operation for about 40min, system will automatically confirm
that debugging is finished and then stop. System resumes standby condition and displays as
below:
——
Debugging code Progress code
LED1
progress
17_Debugging
finished
Code
0104
Display
status
Light
Status code
LED2
code
OF
Display
status
Light
LED3
Code
OF
Meaning
Display
status
Light
Debugging is finished. System is on
standby condition. LED1 displays
module address. LED2 and LED3
display “OF”.
Step 19: after debugging is finished, some functions can be set up according to project’s
actual needs. For specific details, please refer to System Functions Setup. If no special
requirements, skip this step.
Step 20: deliver the product to user and inform user about usage precautions.
61
GMV DC Inverter VRF
5.2.3 Appendix: judgment reference of normal operational parameters
Reference of Debug Parameters of GMV5 DC Inverter Multi VRF System
No
.
Debug item
1
Outdoor ambient temp
3
4
5
6
8
Unit
Reference
ºC(°F) ——
Discharge tube temp of
● When system compressor starts up, temp of
ºC(°F)
inverter compressor 1
discharge tube or casing top in cooling mode is
within 70~95ºC (158~203°F), and at least 10
Casing top temp of
ºC(°F) ºC(50°F) higher than system high pressure
inverter compressor 1
saturation temp; Temp in heating mode is within
Discharge tube temp of
ºC(°F) 65~80ºC(149~176°F), and at least 10ºC(50°F)
inverter compressor 2
higher than system high pressure saturation temp.
● When inverter compressor starts but inverter
Casing top temp of
compressor 2 stops, the discharge tube temperature
ºC(°F)
inverter compressor 2
of inverter compressor 2 is almost the same with
ambient temp.
2
7
Parameter name
System
ODU
parameters
Defrost temp 1
● In cooling mode, defrost temp1 is 5~11ºC
(41~51.8°F) lower than system high pressure value;
ºC(°F)
● In heating mode, defrost temp1 is about 2ºC
(35.6°F) different from system low pressure value.
System high pressure
● System’s normal high pressure value is within
20~25ºC(68~77°F) According to the change in
ambient temp and system operational capacity,
system’s high pressure value is 10~40
ºC(50~104°F) higher than ambient temp The higher
ambient temp is, the smaller temp difference is.
ºC(°F)
● When ambient temp is 25~35ºC(77~95°F),
system’s high pressure value in cooling mode is
44~53ºC(111.2~127.4°F).
● When ambient temp is -5~10ºC(23~50°F),
system’s high pressure value in heating mode is
40~52ºC(104~125.6°F).
System low pressure
● When ambient temp is 25~35ºC(77~95°F),
system’s low pressure value in cooling mode is
0~8ºC(32~46.4°F).
ºC(°F)
● When ambient temp is -5~10ºC(23~50°F),
system’s low pressure value in heating mode is
-15~5ºC(5~41°F).
● In cooling mode, heating electronic expansion
valve remains 480PLS.
● In heating mode, the opening angle of adjustable
electronic expansion valve varies within
120~480PLS.
9
Opening angle of
heating EXV
10
Operating freq. of
inverter compressor 1
Hz
Varies from 20Hz to 95Hz
11
Current of inverter
compressor 1
A
According to different operating freq. and different
load, current will vary from 7A to 40A.
12
IPM temp of inverter
compressor 1
PLS
When ambient temp is lower than 35ºC(95°F), IPM
ºC(°F) temp is below 85ºC(185°F). Highest temp won’t be
above 95ºC(203°F).
62
GMV DC Inverter VRF
Reference of Debug Parameters of GMV5 DC Inverter Multi VRF System
No
.
Debug item
Parameter name
Unit
Reference
13
Inverter compressor 1
driven bus voltage
V
Normal bus voltage is 1.414 times of power voltage.
For example, if 3-phase power voltage is 220V, then
the bus voltage after rectification is: 220V X
1.414=311V. It’s normal if actual voltage varies 15v
from the calculated voltage.
14
Operating freq. of
inverter compressor 2
Hz
Varies from 30Hz to 100Hz
A
According to different operating freq. and different
load, current will vary from 7A to 25A.
System
Current of inverter
15 parameters ODU
compressor 2
IPM temp of inverter
compressor 2
16
Inverter compressor 2
driven bus voltage
17
When ambient temp is lower than 35ºC(95°F), IPM
ºC(°F) temp is below 80ºC(176°F). Highest temp won’t be
above 95ºC(203°F).
Normal bus voltage is 1.414 times of power voltage.
For example, if 3-phase power voltage is 220V , then
the bus voltage after rectification is: 220V X
1.414=311V. It’s normal if actual voltage varies 15v
from the calculated voltage.
V
Reference of Debug Parameters of GMV5 DC Inverter Multi VRF System
No.
Debug item
Parameter name
Unit
Operating freq of fan
motor 1
Hz
Current of fan motor 1
A
20
Operating freq of fan
motor 2
Hz
21
Current of fan motor 2
A
18
19
22
ODU
System
parameters
23
IDU
24
25
Reference
Adjusts in 0~65Hz according to system pressure.
Adjusts in 0~65Hz according to system pressure.
Ambient temp of IDU
ºC(°F) ——
Inlet tube temp of
indoor heat exchanger
ºC(°F)
Outlet tube temp of
indoor heat exchanger
● According to different ambient temp, for a same
IDU under cooling mode, inlet tube temp will be
1~7ºC(33.8~44.6°F) lower than outlet tube temp.
● For a same IDU under heating mode, inlet tube
ºC(°F) temp will be 10~20ºC(50~68°F) lower than outlet
tube temp.
Opening angle of
indoor EXV
PLS
Adjusts opening angle automatically in
200~2000PLS.
Communication data
—
Quantity of IDU and ODU detected by software is the
same with actual quantity. No communication error.
26
Communi
-cation
parameter
27
Drainage
system
——
—
IDU can drain water out completely and smoothly.
Condensate pipe has no backward slope of water.
Water of ODU can be drained completely through
drainage pipe. No water drop from unit base.
28
Others
——
ºC(°F)
Compressor and indoor/outdoor fan motor has no
strange noise. Unit operates normally.
63
GMV DC Inverter VRF
6 Common Malfunction and Troubleshooting
Check the following items before contacting for repair.
Phenomenon
The unit doesn’t
run.
Reason
Measure
Without power supply
Connect to power supply
Voltage is too low
Check if the voltage is within rating range
Broken fuse or breaker trips off
Replace fuse or connect breaker
Insufficient energy of remote controller
Replace new battery
Remote controller is out of control scope
Control scope is within 8m
Unit runs but stop Air intake or outlet of indoor or outdoor unit is
Remove obstruction
immediately
blocked
Air intake or outlet of indoor or outdoor unit is
Remove obstruction
blocked
Adjust setting at wireless remote controller
Improper temperature setting
or wired controller
Adjust setting at wireless remote controller
Fan speed is set too low
or wired controller
Adjust setting at wireless remote controller
Wind direction is not correct
or wired controller
Abnormal cooling
or heating
Door or windows are opened
Close the door or windows
Direct sunshine
Draw curtain or louver
Too many people in the room
Too many heat resources in the room
Reduce heat resources
Filter is blocked for dirt
Clean the filter
(1) When installing remote monitor or central controller, displacement on indoor units’ project codes must be
made. Otherwise, there will be collision malfunction of the project codes. For detail operation methods,
please refer to the GMV5 Installation and Maintenance Manual.
(2) If problem cannot be solved after checking the above items, please contact AC PRO service center and show
phenomena and models.
Following circumstance are not malfunction.
“Malfunction”
Reason
When unit is started immediately after it is
Unit doesn’t
just turned off
run
When power is turned on
Mist comes
Under cooling
from the unit
Slight cracking sound is heard when just
turned on
Noise is
emitted
Overload protection switch makes it run after 3
minutes delay
Standby operating for about 1 minute
Indoor high humidity air is cooled rapidly
It is noise when electronic expansion valve
initialization
There is consecutive sound when cooling
That's sound for gas refrigerant flowing in unit
There is sound when unit starts or stops
That's sound for gas refrigerant stops to flow
There is slight and consecutive sound when
That's sound for operation of drainage system
unit is running or after running
Cracking sound is heard when unit is
That’s sound caused by expansion of panel and
operating and after operating
other parts due to temperature change
64
GMV DC Inverter VRF
“Malfunction”
The unit
blows out
duct
The unit
emits odor
Indoor unit
still runs
after switch
off
Mode
conflict
Reason
When unit runs after no operation for a long
Dust in indoor unit is blew out
period
The room odor absorbed by the unit is blew out
again
Operating
Indoor fan motor will keep running 20-70s so as to
After every indoor unit receive "stop" signal,
take good use of excess cooling and heating and
fan will keep running
prepare for next operation
COOL or HEAT mode cannot be operated
7 Error Indication
When the indoor operating mode conflicts with that
of outdoor unit, indoor fault indicator will flash and
conflict will be shown on the wired controller after 5
minutes. Indoor unit stops to run and meanwhile
change outdoor operating mode as the same as
that of indoor unit, then the unit will go back to
normal. COOL mode doesn't conflict with DRY
mode. FAN mode doesn't conflict with any mode.
Inquiry method of malfunction display: combine division number and content number to check
the corresponding malfunction.
Indoor:
Error Code
Content
Error Code
Content
L0
Malfunction of IDU
d2
Malfunction of lower water
temperature sensor of water tank
L1
Protection of indoor fan
d3
Malfunction of ambient temperature
sensor
L2
Auxiliary heating protection
d4
Malfunction of entry-tube temperature
sensor
L3
Water-full protection
d6
Malfunction of exit-tube temperature
sensor
L4
Abnormal power supply for wired
controller
d7
Malfunction of humidity sensor
L5
Freeze prevention protection
d8
Malfunction of water temperature
sensor
L7
No main IDU
d9
Malfunction of jumper cap
L8
Power supply is insufficient
dA
Web address of IDU is abnormal
L9
For single control over multiple units,
number of IDU is inconsistent
dH
PCB of wired controller is abnormal
LA
For single control over multiple units,
IDU series is inconsistent
dC
Setting capacity of DIP switch code is
abnormal
LH
Alarm due to bad air quality
dL
Malfunction of air outlet temperature
sensor
LC
IDU is not matching with outdoor unit
dE
Malfunction of indoor CO2 sensor
LL
Malfunction of water flow switch
dF
Malfunction of upper water
temperature sensor of water tank
LE
Rotation speed of EC DC water pump
is abnormal
dJ
Malfunction of backwater temperature
sensor
LF
Malfunction of shunt valve setting
dP
Malfunction of inlet tube temperature
sensor of generator
LJ
Setting of functional DIP switch code
is wrong
dU
Malfunction of drainage pipe
temperature sensor of generator
65
GMV DC Inverter VRF
Error Code
Content
Error Code
Content
LP
Zero-crossing malfunction of PG
motor
db
Debugging status
LU
Indoor unit’s branch is not inconsistent
for one-to-more unit of heat recovery
system
dd
Malfunction of solar power
temperature sensor
d1
Indoor PCB is poor
dn
Malfunction of swing parts
Content
Error Code
Content
Outdoor:
Error Code
E0
Malfunction of ODU
FC
Current sensor of compressor 2 is
abnormal
E1
High-pressure protection
FL
Current sensor of compressor 3 is
abnormal
E2
Discharge low-temperature protection
FE
Current sensor of compressor 4 is
abnormal
E3
Low-pressure protection
FF
Current sensor of compressor 5 is
abnormal
E4
High discharge temperature protection
of compressor
FJ
Current sensor of compressor 6 is
abnormal
J0
Protection for other modules
FP
Malfunction of DC motor
J1
Over-current protection of compressor
1
FU
Malfunction of casing top temperature
sensor of compressor 1
J2
Over-current protection of compressor
2
Fb
Malfunction of casing top temperature
sensor of compressor 2
J3
Over-current protection of compressor
3
Fd
Malfunction of exit tube temperature
sensor of mode exchanger
J4
Over-current protection of compressor
4
Fn
Malfunction of inlet tube temperature
sensor of mode exchanger
J5
Over-current protection of compressor
5
b1
Malfunction of outdoor ambient
temperature sensor
J6
Over-current protection for
compressor 6
b2
Malfunction of defrosting temperature
sensor 1
J7
Gas-mixing protection of 4-way valve
b3
Malfunction of defrosting temperature
sensor 2
J8
High pressure ratio protection of
system
b4
Malfunction of liquid temperature
sensor of sub-cooler
J9
Low pressure ratio protection of
system
b5
Malfunction of gas temperature
sensor of sub-cooler
JA
Protection because of abnormal
pressure
b6
Malfunction of inlet tube temperature
sensor of vapor liquid separator
JC
Water flow switch protection
b7
Malfunction of exit tube temperature
sensor of vapor liquid separator
JL
Protection because high pressure is
too low
b8
Malfunction of outdoor humidity
sensor
JE
Oil-return pipe is blocked
b9
Malfunction of gas temperature
sensor of heat exchanger
JF
Oil-return pipe is leaking
bA
Malfunction of oil-return temperature
sensor 1
P0
malfunction of driving board of
compressor
bH
Clock of system is abnormal
66
GMV DC Inverter VRF
Error Code
P1
Content
Driving board of compressor operates
abnormally
Error Code
bE
Content
Malfunction of inlet tube temperature
sensor of condenser
P2
Voltage protection of driving board
power of compressor
bF
Malfunction of outlet tube temperature
sensor of condenser
P3
Reset protection of driving module of
compressor
bJ
High-pressure sensor and
low-pressure sensor are connected
reversely
P4
Drive PFC protection of compressor
bP
Malfunction of temperature sensor of
oil-return 2
P5
Over-current protection of inverter
compressor
bU
Malfunction of temperature sensor of
oil return 3
P6
Drive IPM module protection of
compressor
bb
Malfunction of temperature sensor of
oil return 4
P7
Malfunction of drive temperature
sensor of compressor
H0
Malfunction of driving board of fan
P8
Drive IPM high temperature protection
of compressor
H1
Driving board of fan operates
abnormally
P9
Desynchronizing protection of inverter
compressor
H2
Voltage protection of driving board
power of fan
PA
Malfunction of drive storage chip of
compressor
H3
Reset protection of driving module of
fan
PH
High-voltage protection of
compressor’s drive DC bus bar
H4
Drive PFC protection of fan
PC
Malfunction of current detection circuit
drive of compressor
H5
Over-current protection of inverter fan
PL
Low voltage protection for DC bus bar
of drive of compressor
H6
Drive IPM module protection of fan
PE
Phase-lacking of inverter compressor
H7
Malfunction of drive temperature
sensor of fan
PF
Malfunction of charging loop of driven
of compressor
H8
Drive IPM high temperature protection
of fan
PJ
Failure startup of inverter compressor
H9
Desynchronizing protection of inverter
fan
PP
AC current protection of inverter
compressor
HA
Malfunction of drive storage chip of
inverter outdoor fan
PU
AC input voltage of drive of inverter
compressor
HH
High-voltage protection of fan’s drive
DC bus bar
F0
Main board of ODU is poor
HC
Malfunction of current detection circuit
of fan drive
F1
Malfunction of high-pressure sensor
HL
Low voltage protection of bus bar of
fan drive
F3
Malfunction of low-pressure sensor
HE
Phase-lacking of inverter fan
F5
Malfunction of discharge temperature
sensor of compressor 1
HF
Malfunction of charging loop of fan
drive
F6
Malfunction of exit-tube temperature
sensor
HJ
Failure startup of inverter fan
F7
Malfunction of humidity sensor
HP
AC current protection of inverter fan
F8
Malfunction of water temperature
sensor
HU
AC input voltage of drive of inverter
fan
F9
Malfunction of jumper cap
HJ
Failure startup of inverter fan
67
GMV DC Inverter VRF
Error Code
Content
Error Code
Content
FA
Web address of IDU is abnormal
HP
AC current protection of inverter fan
FH
Current sensor of compressor 1 is
abnormal
HU
AC input voltage of drive of inverter
fan
Error Code
Content
Error Code
Content
U0
Preheat time of compressor is
insufficient
C6
Alarm because ODU quantity is
inconsistent
U2
Wrong setting of ODU’s capacity
code/jumper cap
C7
Abnormal communication of converter
U3
Power supply phase sequence
protection
C8
Emergency status of compressor
U4
Refrigerant-lacking protection
C9
Emergency status of fan
U5
Wrong address for driving board of
compressor
CA
Emergency status of module
U6
Alarm because valve is abnormal
CH
Rated capacity is too high
U8
Malfunction of pipeline for IDU
CC
No main unit
U9
Malfunction of pipeline for ODU
CL
The matching ratio of rated capacity
for IDU and ODU is too low
UC
Setting of main IDU is succeeded
CE
Communication malfunction between
mode exchanger and IDU
UL
Emergency operation DIP switch code
of compressor is wrong
CF
Malfunction of multiple main control
units
UE
Charging of refrigerant is invalid
CJ
Address DIP switch code of system is
shocking
UF
Identification malfunction of IDU of
mode exchanger
CP
Malfunction of multiple wired
controller
C0
Communication malfunction between
IDU, ODU and IDU’s wired controller
CU
Communication malfunction between
IDU and the receiving lamp
C1
Communication malfunction between
main control and DC-DC controller
Cb
Overflow distribution of IP address
C2
Communication malfunction between
main control and inverter compressor
driver
Cd
Communication malfunction between
mode exchanger and ODU
C3
Communication malfunction between
main control and inverter fan driver
Cn
Malfunction of network for IDU and
ODU of mode exchanger
C4
Malfunction of lack of IDU
Cy
Communication malfunction of mode
exchanger
C5
Alarm because project code of IDU is
inconsistent
Debugging:
68
GMV DC Inverter VRF
Status:
Error Code
Content
Error Code
Content
A0
Unit waiting for debugging
Ay
Shielding status
A2
Refrigerant recovery operation of
after-sales
n0
SE operation setting of system
A3
Defrosting
n3
Compulsory defrosting
A4
Oil-return
n4
Limit setting for max. capacity/output
capacity
A6
Heat pump function setting
n5
Compulsory excursion of engineering
code of IDU
A7
Quiet mode setting
n6
Inquiry of malfunction
A8
Vacuum pump mode
n7
Inquiry of parameters
AH
Heating
n8
Inquiry of project code of IDU
AC
Cooling
n9
Check quantity of IDU on line
AL
Charge refrigerant automatically
nA
Heat pump unit
AE
Charge refrigerant manually
nH
Heating only unit
AF
Fan
nC
Cooling only unit
AJ
Cleaning reminding of filter
nE
Negative code
AP
Debugging confirmation when starting
up the unit
nF
Fan model
AU
Long-distance emergency stop
nJ
High temperature prevention when
heating
Ab
Emergency stop of operation
nU
Eliminate the long-distance shielding
command of IDU
Ad
Limit operation
nb
Bar code inquiry
An
Child lock status
nn
Length modification of connection
pipe of ODU
8 Maintenance and Care
Regular check, Maintenance and care should be performed every six months by professional
personnel, which will prolong the unit life span. Disconnect the power supply before cleaning and
maintenance.
8.1 Outdoor Heat Exchanger
Outdoor heat exchanger is required to be cleaned once every six months. Use vacuum
cleaner with nylon brush to clean up dust and sundries on the surface of heat exchanger. Blow
away dust by compressed air if it is available. Never use water to wash the heat exchanger.
8.2 Drain Pipe
Regularly check if the drain pipe is clogged in order to drain condensate smoothly.
69
GMV DC Inverter VRF
8.3 Notice before Seasonal Use
(1) Check if the inlet/outlet of the indoor/outdoor unit is clogged.
(2) Check if the ground wire is earthed reliably.
(3) Check if battery of remote wireless controller has been replaced.
(4) Check if the filter screen has been set soundly.
(5) After long period of shutdown, open the main power switch 8 hours before reoperating the
unit so as to preheat the compressor crankcase.
(6) Check if the outdoor unit is installed firmly. If there is something abnormal, please contact
the AC PRO appointed service center.
8.4 Maintenance after Seasonal Use
(1) Cut off main power supply of the unit.
(2) Clean filter screen and indoor and outdoor units.
(3) Clean the dust and sundries on the indoor and outdoor units.
(4) In the event of rusting, use the anti-rust paint to stop spreading of rust.
8.5 Parts Replacement
Purchase parts from AC PRO appointed service center or dealer if necessary.
NOTICE! During airtight and leakage test, never mix oxygen, ethyne and other dangerous
gas into refrigeration circuit. In case of hazard, it's better to use nitrogen or refrigerant to
accomplish such test.
9 After-sales Service
In case the air-conditioning unit you bought has any quality problem or you have any inquiry,
please contact the local after-sales service agency designated by AC PRO.
Warranty should meet the following requirements:
(1) First run of the unit should be operated by professional personnel from AC PRO appointed
service center.
(2) Only AC PRO manufactured accessories can be used on the machine.
(3) All the instructions listed in this manual should be followed.
(4) Warranty will be automatically invalid if fails to obey any item mentioned above.
70
0DWHULDO6XSSO\,QFGED$&3UR
Add: 11700 Industry Ave., Fontana, CA 92337, USA
Tel: 1-951-360-0630
E -mail: www.acpro.com
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