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D.C. Inverter
Multi VRF Modular
Owner's Manual
Air Conditioners
AOU-224VRDC3A
AOU-280VRDC3A
AOU-335VRDC3A
AOU-400VRDC3A
AOU-450VRDC3A
AOU-504VRDC3A
AOU-2460VRDC3A
Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference.
Preface
ALPICAIR DC Inverter Multi VRF System, with the most advanced technologies in the world, uses ecofriendly refrigerant R410A as its cooling medium. For correct installation and operation, please read
this manual carefully. Before reading the manual, please note that:
(1) For safety operation, please strictly follow the instructions in this manual.
(2) During operation, the gross rated capacity of working IDU should be within the gross rated
capacity of ODU. Otherwise, IDU’s cooling/heating performance will be reduced.
(3) This manual must be in the hands of direct operators or maintenance men.
(4) In case of malfunction and operation failure, please examine the following items and contact
our authorized service centers as soon as possible.
1) Nameplate (model, cooling capacity, product code, ex-factory date).
2) Malfunction status (detail description of conditions before and after malfunction occurs)
(6) All units have been strictly tested and proved to be 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.
(7) All graphics and information in this manual are only for reference. Manufacturer reserves the
right for changes in terms of sales or production at any time and without prior notice.
This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they have been given
supervision or instruction concerning use of the appliance in a safe way and understand the hazards
involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be
made by children without supervision.
DISPOSAL:Donot dispose this product as unsorted municipal waste. Collection of such waste
separately for special treatment is necessary.
Contents
1 Safety Notices (Please be sure to abide ) ..................................................................................... 1
2 Product Introduction ............................................................................................................................ 3
2.1 Names of Main Parts ..................................................................................................................... 4
2.2 Combinations of Outdoor Units .................................................................................................... 4
2.3 Combinations of Indoor and Outdoor Units ................................................................................ 5
2.4 The Range of Production Working Temperature ....................................................................... 7
3 Preparation before Installation ............................................................................................................ 7
3.1 Standard Parts ................................................................................................................................ 7
3.2 Installation Site ............................................................................................................................... 7
3.3 Piping Work Requirements ......................................................................................................... 13
4 Installation Instruction ....................................................................................................................... 14
4.1 Physical Dimension of the Outdoor Unit and Mounting Hole ................................................ 14
4.2 Connection Pipe ........................................................................................................................... 16
4.3 Installation of the Connection Pipe ............................................................................................ 27
4.4 Air Purging and Refrigerant Charge .......................................................................................... 32
4.5 Electric Wiring............................................................................................................................... 35
4.6 System Communication .............................................................................................................. 39
4.7 Connection Method and Steps for System Communication .................................................. 43
4.8 External Electrical Wiring Diagram ............................................................................................ 48
5 Check Items after Installation and Trial Run ...................................................................................... 49
5.1 Check Items after Installation ..................................................................................................... 49
5.2 Trial Run ........................................................................................................................................ 50
6 Common Malfunction and Troubleshooting ...................................................................................... 63
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....................................................................................................... 69
8.4 Maintenance after Seasonal Use .............................................................................................. 70
8.5 Parts Replacement ...................................................................................................................... 70
9 After-sales Service .............................................................................................................................. 70
DC Inverter VRF
1 Safety Notices (Please be sure to abide )
Warning: If not abide strictly, it may cause severe damage to the unit or the people.
Note: If not abide strictly, it may cause slight or medium damage to the unit or the
people.
This sign indicates that the operation must be prohibited. Improper operation may
cause severe damage or death to people.
This sign indicates that the items must be observed. Improper operation may cause
damage to people or property.
WARNING!
This product can’t be installed at corrosive, inflammable or explosive environment or the place
with special requirements, such as kitchen. Otherwise, it will affect the normal operation or
shorten the service life of the unit, or even cause fire hazard or serious injury. As for above
special places, please adopt special air conditioner with anti-corrosive or anti-explosion
function.
Installation should be
conducted by dealer or
Follow this instruction to
qualified personnel. Please do
complete the installation work.
not attempt to install the unit
Please carefully read this
by yourself. Improper handling
manual before unit startup and
may result in water leakage,
service.
electric shock or fire disaster
etc.
Make sure the unit can be
Before installation, please check
earthed properly and soundly
if the power supply is in
after plugging into the socket
accordance with the
so as to avoid electric shock.
requirements specified on the
Please do not connect the
nameplate. And also take care of
ground wire to gas pipe, water
the power safety.
pipe, lightning rod or
telephone line.
If refrigerant leakage happens
Be sure to use the exclusive
during installation, please
accessory and part to prevent
ventilate immediately.
the water leakage, electric shock
Poisonous gas will emerge if
and fire accidents.
the refrigerant gas meets fire.
Wire size of power cord should
After connecting the power
be large enough.The damaged
cord, please fix the electric
power cord and connection wire
box cover properly in order to
should be replaced by exclusive
avoid accident.
cable.
1
DC Inverter VRF
Never fail to comply with the
Never short-circiut or cancel
nitrigen charge
the pressure switch to prevent
requirements.Charge nitrogen
unit damage.
when welding pipes.
Before using the unit, please
Please firstly connect the wired
check if the piping and wiring
controller before energization,
are correct to avoid water
otherwise wired controller can
leakage, refrigerant leakage,
not be used.
electric shock, or fire etc.
Open the door and window
and keep good ventilation in
Do not insert fingers or objects
the room to avoid oxygen
into air outlet/inlet grille.
deficit when the gas/oil
supplied heating equipment is
used.
Turn off the unit after it runs at
Never start up or shut off the air
least five minutes; otherwise it
conditioner by means of directly
will influence oil return of the
plug or unplug the power cord.
compressor.
Do not allow children operate
Do not operate this unit with
this unit.
wet hands.
Turn off the unit or cut off the
Never spray or flush water
power supply before cleaning
towards unit, otherwise
the unit, otherwise electric shock
malfunction or electric shock
or injury may happen.
may happen.
Electrify the unit 8 hours
before operation. Please
Do not expose the unit to the
switch on for 8 hours before
moist or corrosive
operation. Do not cut off the
circumstances.
power when 24 hours
short-time halting (to protect
the compressor).
2
DC Inverter VRF
Under cooling mode, please
Volatile liquid, such as diluent or
don't set the room temperature
gas will damage the unit
too low and keep the
appearance.Only use soft cloth
temperature difference
with a little neutral detergent to
between indoor and outdoor
clean the outer casing of unit.
unit within 5.
If anything abnormal happens
(such as burning smell), please
User is not allowed to repair
power off the unit and cut off the
the unit. Fault service may
main power supply, and then
cause electric shock or fire
immerdiately contact ALPICAIR
accidents. Please contact
appointed service center.If
ALPICAIR appointed
abnormality keeps going, the
service
center for help.
unit might be damaged and lead
to electric shock or fire.
ALPICAIR 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.
DISPOSAL:Donot dispose this product as unsorted municipal waste. Collection of such waste
separately for special treatment is necessary.
2 Product Introduction
ALPICAIR Multi VRF Modular System adopts inverter compressor technology. According to
change the displacement of compressor, stepless capacity regulation within range of 10%-100%
can be realized. Various product lineup is provided with capacity range from 22.4kW to 246kW,
which can be widely used in working area and especially applicable to the place with variable load
change.ALPICAIR air conditioner is absolutely your best choice.
3
DC Inverter VRF
2.1 Names of Main Parts
Fig. 2.1.1
NO.
①
②
③
④
⑤
Name
Fan, Motor
Electric Box
Assembly
Valve interface
Power cord
through-hole
Communication
code through-hole
Note: The picture is only used for reference and the actual product prevails.
2.2 Combinations of Outdoor Units
Model(Single)
AOU-680VRDC3A
AOU-730VRDC3A
AOU-785VRDC3A
AOU-850VRDC3A
Model(Combined)
AOU-280VRDC3A
+ AOU-400VRDC3A
AOU-280VRDC3A
+ AOU-450VRDC3A
AOU-280VRDC3A
+ AOU-504VRDC3A
AOU-280VRDC3A
+ AOU-560VRDC3A
Model(Single)
AOU-900VRDC3A
AOU-960VRDC3A
AOU-1010VRDC3A
AOU-1065VRDC3A
Model(Combined)
AOU-280VRDC3A
+ AOU-615VRDC3A
AOU-335VRDC3A
+ AOU-615VRDC3A
AOU-400VRDC3A
+ AOU-615VRDC3A
AOU-450VRDC3A
+ AOU-615VRDC3A
Model(Single)
AOU-1130VRDC3A
AOU-1180VRDC3A
AOU-1235VRDC3A
AOU-1300VRDC3A
Model(Combined)
AOU-504VRDC3A
+ AOU-615VRDC3A
AOU-560VRDC3A
+ AOU-615VRDC3A
AOU-615VRDC3A
+ AOU-615VRDC3A
AOU-280VRDC3A
+ AOU-450VRDC3A
+ AOU-560VRDC3A
Model(Single)
AOU-1350VRDC3A
AOU-1410VRDC3A
AOU-1460VRDC3A
AOU-1515VRDC3A
Model(Combined)
AOU-280VRDC3A
+ AOU-450VRDC3A
+ AOU-615VRDC3A
AOU-335VRDC3A
+ AOU-450VRDC3A
+ AOU-615VRDC3A
AOU-280VRDC3A
+ AOU-560VRDC3A
+ AOU-615VRDC3A
AOU-280VRDC3A
+ AOU-615VRDC3A
+ AOU-615VRDC3A
Model(Single)
AOU-1580VRDC3A
AOU-1630VRDC3A
AOU-1685VRDC3A
AOU-1750VRDC3A
Model(Combined)
AOU-280VRDC3A
+ AOU-615VRDC3A
+ AOU-615VRDC3A
AOU-400VRDC3A
+ AOU-615VRDC3A
+ AOU-615VRDC3A
AOU-450VRDC3A
+ AOU-615VRDC3A
+ AOU-615VRDC3A
AOU-504VRDC3A
+ AOU-615VRDC3A
+ AOU-615VRDC3A
4
DC Inverter VRF
Model(Single)
AOU-1800VRDC3A
AOU-1845VRDC3A
AOU-1908VRDC3A
AOU-1962VRDC3A
Model(Combined)
AOU-560VRDC3A
+ AOU-615VRDC3A
+ AOU-615VRDC3A
AOU-615VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
AOU-280VRDC3A
+AOU-450VRDC3A
+AOU-560VRDC3A
+AOU-615VRDC3A
AOU-280VRDC3A
+AOU-504VRDC3A
+AOU-560VRDC3A
+AOU-615VRDC3A
Model(Single)
AOU-2016VRDC3A
AOU-2072VRDC3A
AOU-2028VRDC3A
AOU-2184VRDC3A
Model(Combined)
AOU-280VRDC3A
+AOU-560VRDC3A
+AOU-560VRDC3A
+AOU-615VRDC3A
AOU-280VRDC3A
+AOU-560VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
AOU-280VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
AOU-335VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
Model(Single)
AOU-2240VRDC3A
AOU-2295VRDC3A
AOU-2350VRDC3A
AOU-2405VRDC3A
Model(Combined)
AOU-400VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
AOU-450VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
AOU-504VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
AOU-560VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
+AOU-615VRDC3A
Model(Single)
AOU-2460VRDC3A
Model(Combined)
AOU-615VRDC3A+AOU-615VRDC3A
+AOU-615VRDC3A+AOU-615VRDC3A
Note:Any combination model is not allowed to be combined with the outdoor units belonging
to different series.
2.3 Combinations of Indoor and Outdoor Units
The following table indicates the number of IDU for ODU
ODU model
Max number of connectable IDU (unit)
AOU-224VRDC3A
13
AOU-280VRDC3A
16
AOU-335VRDC3A
19
AOU-400VRDC3A
23
AOU-450VRDC3A
26
AOU-504VRDC3A
29
AOU-560VRDC3A
33
AOU-615VRDC3A
36
AOU-680VRDC3A
39
AOU-730VRDC3A
43
AOU-785VRDC3A
46
AOU-850VRDC3A
50
AOU-900VRDC3A
53
AOU-960VRDC3A
56
AOU-1010VRDC3A
59
AOU-1065VRDC3A
63
AOU-1130VRDC3A
64
AOU-1180VRDC3A
64
AOU-1235VRDC3A
64
AOU-1300VRDC3A
64
AOU-1350VRDC3A
64
AOU-1410VRDC3A
66
AOU-1460VRDC3A
69
5
DC Inverter VRF
ODU model
Max number of connectable IDU (unit)
AOU-1515VRDC3A
71
AOU-1580VRDC3A
74
AOU-1630VRDC3A
77
AOU-1685VRDC3A
80
AOU-1750VRDC3A
80
AOU-1800VRDC3A
80
AOU-1845VRDC3A
80
AOU-1908VRDC3A
80
AOU-1962VRDC3A
80
AOU-2016VRDC3A
80
AOU-2072VRDC3A
80
AOU-2128VRDC3A
80
AOU-2184VRDC3A
80
AOU-2240VRDC3A
80
AOU-2295VRDC3A
80
AOU-2350VRDC3A
80
AOU-2405VRDC3A
80
AOU-2460VRDC3A
80
The total capacity of indoor units should be within 50%~135% of that of outdoor units.
Fig. 2.3.1
Fig. 2.3.1 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.
6
DC Inverter VRF
2.4 The Range of Production Working Temperature
Cooling
Ambient temperature: -5℃~52℃
Heating
Ambient temperature: -20℃~24℃
When the indoor units are all VRF fresh air processor, the unit operating range is as follows:
Cooling
Ambient temperature: 16°C~45°C
Heating
Ambient temperature: -7°C~16°C
Note:Out of the working Temperature Range may damage this products and will invalidate
the warranty.
3 Preparation before Installation
Note: The picture is only used for reference and the actual product prevails. Unit: mm.
3.1 Standard Parts
Please use the following standard parts supplied by ALPICAIR.
Parts for Outdoor Unit
Number
Name
Picture
Quantity
Remarks
D.C. Inverter
Multi VRF Modular
Owner's Manual
Air Conditioners
1
Owner's Manual
1
AOU-224VRDC3A
AOU-280VRDC3A
AOU-335VRDC3A
AOU-400VRDC3A
AOU-450VRDC3A
AOU-504VRDC3A
AOU-2460VRDC3A
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
3.2 Installation Site
Forbidden Items! It indicates that improper operation might lead to human casualty or
sever injury.
Items need to be followed. It indicates that improper operation might lead to personal
injury or property damage.
7
DC Inverter VRF
Install the unit at a place where
Never expose the unit under
is adequate to withstand the
direct sunshine and
weight of the unit and make sure
rainfall.Install the unit at a
the unit would not shake or fall
place where is against dust,
off.
typhoon and earthquake.
Leave some space for heat
Try to keep the unit away from
combustible,inflammable
exchanging and servicing so
and
as to guarantee unit normal
corrosive gas or exhaust gas.
operation.
Keep the indoor and outdoor
Never allow children to
units close to each other as
approach to the unit and take
much as possible so as to
measures to prevent children
decrease the pipe length and
touching the unit.
bends.
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
Fig. 3.2.1
8
DC Inverter VRF
3.2.1.2 Space dimension for dual-module unit
Fig. 3.2.2
3.2.1.3 Space dimension for three-module unit
Fig. 3.2.3
9
DC Inverter VRF
3.2.1.4 Space dimension for four-module unit
Fig. 3.2.4
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 or above. When the unit is located
in a totally open space with no obstructions in four directions, keep the distance
between the unit top and wall at least 1500mm or above (See Fig. 3.2.5). When space
is limited within 1500mm or the unit is not set in an open space, air return pipe is
required to be installed in order to keep good ventilation (See Fig. 3.2.6).
Fig. 3.2.5
Fig. 3.2.6
10
DC Inverter VRF
3.2.3 Space dimension for multiple-module unit
For keeping good ventilation, make sure there is no obstructions above the unit.
When the unit is located at a half-open space (front and left/right side is open), install the unit
as per the same or opposite direction.
Fig. 3.2.7
Fig. 3.2.8
11
DC Inverter VRF
3.2.4 Take seasonal wind into consideration when installing the outdoor unit
(1)Anti-monsoon installation requirements for unit not connecting exhaust duct:
Fig. 3.2.9
12
DC Inverter VRF
(2)Anti-monsoon installation requirements for unit connecting exhaust duct:
Fig. 3.2.10
3.2.5 Take snow into consideration when installing the outdoor unit
3.3 Piping Work Requirements
Fig. 3.2.11
Refer to the table below for piping work requirements.
R410A Refrigerant System
Outer Diameter (mm)
Wall Thickness (mm)
Type
Φ6.35
≥0.8
0
Φ9.52
≥0.8
0
Φ12.70
≥0.8
0
Φ15.9
≥1.0
0
Φ19.05
≥1.0
1/2H
Φ22.2
≥1.5
1/2H
Φ25.40
≥1.5
1/2H
Φ28.60
≥1.5
1/2H
Φ34.90
≥1.5
1/2H
Φ38.10
≥1.5
1/2H
Φ41.30
≥1.5
1/2H
Φ44.5
≥1.5
1/2H
Φ54.1
≥1.5
1/2H
13
DC Inverter VRF
4 Installation Instruction
4.1 Physical Dimension of the Outdoor Unit and Mounting Hole
Outline and Physical Dimention of AOU-224VRDC3A and AOU-280VRDC3A unit
Unit: mm
Fig. 4.1.1
14
DC Inverter VRF
Outline and Physical Dimention of AOU-335VRDC3A, AOU-400VRDC3A and
AOU-450VRDC3A unit
Unit: mm
Fig. 4.1.2
Outline and Physical Dimention of AOU-504VRDC3A, AOU-560VRDC3A and
AOU-615VRDC3A unit
Unit: mm
Fig. 4.1.3
15
DC Inverter VRF
4.2 Connection Pipe
4.2.1 Schematic Diagram of Piping Connection
Fig. 4.2.1
4.2.2 Schematic Diagram of Piping Sequence
AOU-224VRDC3A and AOU-280VRDC3A
Fig. 4.2.2
16
DC Inverter VRF
AOU-335VRDC3A, AOU-400VRDC3A and AOU-450VRDC3A
Fig. 4.2.3
AOU-504VRDC3A, AOU-560VRDC3A and AOU-615VRDC3A
Fig. 4.2.4
17
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.
Fig. 4.2.5
L10: Length from the first branch to the farthest IDU;
L11: Length from the first branch to the nearest IDU;
18
DC Inverter VRF
Equivalent length of branch of IDU is 0.5m
Allowable
Value
R410A Refrigerant System
Total length (actual length) of fitting pipe
Length of farthest fitting
pipe(m)
≤1000
Actual length
≤165
Equivalent length
≤190
Fitting Pipe
L1+L2+L3+L4+…+L9+a+b+…+i+j
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
L10-L11
Equivalent length from the first branch to the furthest
piping (1)
≤40
L6+L7+L8+L9+j
Outdoor unit at upper
≤90
——
Outdoor unit at lower
≤90
——
Height difference between indoor units (m)
≤30
——
Maximum length of Main pipe(2)
<90
L1
From IDU to its nearest branch (3)
≤40
a,b,c,d,e,f,g,h,i,j
Height difference between
outdoor unit and indoor
unit
Note:
(1)Normally, the pipe length from the first branch of IDU to the farthest IDU is 40m. When
those three conditions as below are satisfied, the length can reached 90cm.
1) Actual length of pipe in total: L1+L2x2+L3x2+L4x2+…+L9x2+a+b+…+i+j≤1000m;
2) Length between each IDU and its nearest branch a, b, c, d, e, f, g, h, i, j≤40m;
3) Difference between the pipe length from the 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.
(2) When the maximum length of the main pipe from ODU to the first branch of IDU is≥90m,
then adjust the pipe size of the gas pipe and liquid pipe of main pipe according to the
following table.
Outdoor Model
Gas pipe size(mm)
Liquid pipe size(mm)
AOU-224VRDC3A
No need to enlarge pipe size
No need to enlarge pipe size
AOU-280VRDC3A
No need to enlarge pipe size
Φ12.7
AOU-335VRDC3A
Φ28.6
Φ15.9
AOU-400VRDC3A
Φ28.6
Φ15.9
AOU-450VRDC3A
Φ31.8
Φ15.9
AOU-504VRDC3A
Φ31.8
Φ19.05
AOU-560VRDC3A
Φ31.8
Φ19.05
AOU-615VRDC3A
Φ31.8
Φ19.05
AOU-680VRDC3A
Φ31.8
Φ19.05
AOU-730VRDC3A
Φ38.1
Φ22.2
AOU-785VRDC3A
Φ38.1
Φ22.2
AOU-850VRDC3A
Φ38.1
Φ22.2
AOU-900VRDC3A
Φ38.1
Φ22.2
19
DC Inverter VRF
Outdoor Model
Gas pipe size(mm)
Liquid pipe size(mm)
AOU-960VRDC3A
Φ38.1
Φ22.2
AOU-1010VRDC3A
Φ41.3
Φ22.2
AOU-1065VRDC3A
Φ41.3
Φ22.2
AOU-1130VRDC3A
Φ41.3
Φ22.2
AOU-1180VRDC3A
Φ41.3
Φ22.2
AOU-1235VRDC3A
Φ41.3
Φ22.2
AOU-1300VRDC3A
Φ41.3
Φ22.2
AOU-1350VRDC3A
Φ41.3
Φ22.2
AOU-1410VRDC3A
Φ44.5
Φ22.2
AOU-1460VRDC3A
Φ44.5
Φ22.2
AOU-1515VRDC3A
Φ44.5
Φ22.2
AOU-1580VRDC3A
Φ44.5
Φ22.2
AOU-1630VRDC3A
Φ44.5
Φ22.2
AOU-1685VRDC3A
Φ44.5
Φ22.2
AOU-1750VRDC3A
Φ44.5
Φ22.2
AOU-1800VRDC3A
Φ44.5
Φ22.2
AOU-1845VRDC3A
Φ44.5
Φ22.2
AOU-1908VRDC3A
Φ51.4
Φ25.4
AOU-1962VRDC3A
Φ51.4
Φ25.4
AOU-2016VRDC3A
Φ51.4
Φ25.4
AOU-2072VRDC3A
Φ51.4
Φ25.4
AOU-2128VRDC3A
Φ51.4
Φ25.4
AOU-2184VRDC3A
Φ51.4
Φ25.4
AOU-2240VRDC3A
Φ51.4
Φ25.4
AOU-2295VRDC3A
Φ51.4
Φ25.4
AOU-2350VRDC3A
Φ51.4
Φ25.4
AOU-2405VRDC3A
Φ51.4
Φ25.4
AOU-2460VRDC3A
Φ51.4
Φ25.4
(3) If the length between an IDU and its nearest branch is above 10m, then increase the size
of the liquid pipe of IDU (only for the pipe size that is≤6.35mm).
20
DC Inverter VRF
4.2.4 Connection Pipe among Outdoor Modules
Fig. 4.2.6
Fig. 4.2.7
Note: When the distance between outdoor units exceeds 2m, U-type oil trap should be added
at low-pressure gas pipe. A+B≤10m.
4.2.5 Fitting pipe between Outdoor Unit and the First Manifold
4.2.5.1 For single module system, pipe size (between outdoor unit and the first manifold) is
determined by that of outdoor unit.
Fig. 4.2.8
21
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)
Liquid Pipe(mm)
AOU-224VRDC3A
Φ19.05
Φ9.52
AOU-280VRDC3A
Φ22.2
Φ9.52
AOU-335VRDC3A
Φ25.4
Φ12.7
AOU-400VRDC3A
Φ25.4
Φ12.7
AOU-450VRDC3A
Φ28.6
Φ12.7
AOU-504VRDC3A
Φ28.6
Φ15.9
AOU-560VRDC3A
Φ28.6
Φ15.9
AOU-615VRDC3A
Φ28.6
Φ15.9
4.2.5.2 For multi-module unit, select appropriate manifold connected to oudoor module as per the
pipe size of basic module. Pipe size of basic outdoor module is shown as follows:
Fig. 4.2.9
Pipe between module and branch of ODU
Basic Module
Gas Pipe(mm)
Liquid Pipe(mm)
AOU-224VRDC3A
Φ19.05
Φ9.52
AOU-280VRDC3A
Φ22.2
Φ9.52
AOU-335VRDC3A
Φ25.4
Φ12.7
AOU-400VRDC3A
Φ25.4
Φ12.7
AOU-450VRDC3A
Φ28.6
Φ12.7
AOU-504VRDC3A
Φ28.6
Φ15.9
AOU-560VRDC3A
Φ28.6
Φ15.9
AOU-615VRDC3A
Φ28.6
Φ15.9
Module’s capacity C(kW)
Model
68.0≤C
ML01/A
Select the branch of outdoor module
Select the branch of outdoor
module
22
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. 4.2.10
Pipe size between manifolds
Total capacity of upstream modules
Q(kW)
Gas Pipe(mm)
Liquid Pipe(mm)
22.4≥ Q
Φ19.05
Φ9.52
28.0≥Q>22.4
Φ22.2
Φ9.52
40.0≥Q>28.0
Φ25.4
Φ12.7
45.0≥Q>40.0
Φ28.6
Φ12.7
68.0≥Q>45.0
Φ28.6
Φ15.9
96.0≥Q>68.0
Φ31.8
Φ19.05
135.0≥Q>96.0
Φ38.1
Φ19.05
186.0≥Q>135.0
Φ41.3
Φ19.05
Q>186.0
Φ44.5
Φ22.2
4.2.5.4 Fitting pipe between the first manifold from indoor unit and the end manifold from outdoor
unit
Single module unit
Fig. 4.2.11
23
DC Inverter VRF
Basic Module(single module)
Pipe between ODU and the first branch of IDU
Gas Pipe(mm)
Liquid Pipe(mm)
AOU-224VRDC3A
Φ19.05
Φ9.52
AOU280VRDC3A
Φ22.2
Φ9.52
AOU-335VRDC3A
Φ25.4
Φ12.7
AOU-400VRDC3A
Φ25.4
Φ12.7
AOU-450VRDC3A
Φ28.6
Φ12.7
AOU-504VRDC3A
Φ28.6
Φ15.9
AOU-560VRDC3A
Φ28.6
Φ15.9
AOU-615VRDC3A
Φ28.6
Φ15.9
For multiple modules, the piping from ODU to the first branch of IDU is based on the total
rated capacity of outdoor modules.
Fig. 4.2.12
Pipe between ODU and the first branch of IDU
Total rated capacity of outdoor modules
(multi-modular system)
Gas Pipe(mm)
Liquid Pipe(mm)
AOU-680VRDC3A
Ф28.6
Ф15.9
AOU-730VRDC3A
Ф31.8
Ф19.05
AOU-785VRDC3A
Ф31.8
Ф19.05
AOU-850VRDC3A
Ф31.8
Ф19.05
AOU-900VRDC3A
Ф31.8
Ф19.05
AOU-960VRDC3A
Ф31.8
Ф19.05
AOU-1010VRDC3A
Ф38.1
Ф19.05
AOU-1065VRDC3A
Ф38.1
Ф19.05
AOU-1130VRDC3A
Ф38.1
Ф19.05
AOU-1180VRDC3A
Ф38.1
Ф19.05
AOU-1235VRDC3A
Ф38.1
Ф19.05
AOU-1300VRDC3A
Ф38.1
Ф19.05
24
DC Inverter VRF
Pipe between ODU and the first branch of IDU
Total rated capacity of outdoor modules
(multi-modular system)
Gas Pipe(mm)
Liquid Pipe(mm)
AOU-1350VRDC3A
Ф38.1
Ф19.05
AOU-1410VRDC3A
Ф41.3
Ф19.05
AOU-1460VRDC3A
Ф41.3
Ф19.05
AOU-1515VRDC3A
Ф41.3
Ф19.05
AOU-1580VRDC3A
Ф41.3
Ф19.05
AOU-1630VRDC3A
Ф41.3
Ф19.05
AOU-1685VRDC3A
Ф41.3
Ф19.05
AOU-1750VRDC3A
Ф41.3
Ф19.05
AOU-1800VRDC3A
Ф41.3
Ф19.05
AOU-1845VRDC3A
Ф41.3
Ф19.05
AOU-1908VRDC3A
Ф44.5
Ф22.2
AOU-1962VRDC3A
Ф44.5
Ф22.2
AOU-2016VRDC3A
Ф44.5
Ф22.2
AOU-2072VRDC3A
Ф44.5
Ф22.2
AOU-2128VRDC3A
Ф44.5
Ф22.2
AOU-2184VRDC3A
Ф44.5
Ф22.2
AOU-2240VRDC3A
Ф44.5
Ф22.2
AOU-2295VRDC3A
Ф44.5
Ф22.2
AOU-2350VRDC3A
Ф44.5
Ф22.2
AOU-2405VRDC3A
Ф44.5
Ф22.2
AOU-2460VRDC3A
Ф44.5
Ф22.2
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. 4.2.13(a)
25
DC Inverter VRF
Fig. 4.2.13(b)
R410A Refrigerant System
Total capacity of downstream
indoor unit(s) C (kW)
Model
C<20.0
FQ01A/A
20.0≤C≤30.0
FQ01B/A
30.0<C≤70.0
FQ02/A
70.0<C≤135.0
FQ03/A
135.0<C
FQ04/A
C≤40.0
FQ014/H1
40.0<C≤68.0
FQ018/H1
68.0<C
FQ018/H2
Y-type Manifold
T- type Manifold
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. 4.2.14
26
DC Inverter VRF
Dimension of the pipe of indoor branch
Total capacity of downstream indoor
unit(s) C(kW)
Gas Pipe(mm)
Liquid Pipe (mm)
C≤5.0
Φ12.7
Φ6.35
5.0<C≤14.2
Φ15.9
Φ9.52
14.2<C≤22.4
Φ19.05
Φ9.52
22.4<C≤28.0
Φ22.2
Φ9.52
28.0<C≤40.0
Φ25.4
Φ12.7
40.0<C≤45.0
Φ28.6
Φ12.7
45.0<C≤68.0
Φ28.6
Φ15.9
68.0<C≤96.0
Φ31.8
Φ19.05
96.0<C≤135.0
Φ38.1
Φ19.05
135.0<C≤186.0
Φ41.3
Φ19.05
186.0<C
Φ44.5
Φ22.2
4.2.5.7 Fitting pipe between indoor unit and manifold
Manifold should be matched with fitting pipe of indoor unit.
Fig. 4.2.15
Rated capacity of indoor unit C(kW)
Pipe between indoor branch and IDU
Gas Pipe(mm)
Liquid Pipe(mm)
C≤2.8
Φ9.52
Φ6.35
2.8<C≤5.0
Φ12.7
Φ6.35
5.0<C≤14.2
Φ15.9
Φ9.52
14.0<C≤22.4
Φ19.05
Φ9.52
22.4<C≤28.0
Φ22.2
Φ9.52
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
27
DC Inverter VRF
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. The pipes can not 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. 4.3.1.
Fig. 4.3.1
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. 4.3.2(a). T- type manifold, See the Fig. 4.3.2(b)
Fig. 4.3.2(a)
28
DC Inverter VRF
Fig. 4.3.2(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. 4.3.3.
Fig. 4.3.3
(3) Y-type manifold can be installed vertically or horizontally. Confirm the position and then
weld the manifold pipe. See the Fig. 4.3.4(a). T-type manifold must be installed
horizontally with inclination, see the Fig. 4.3.4(b).
Fig. 4.3.4(a)
Fig. 4.3.4(b)
29
DC Inverter VRF
(4) Manifold is isolated by insulating material that can bear 120℃ or higher temperature.
Manifold attached foam can not 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. The length
of a straight pipe before the main pipe port of the manifold cannot be less than 500 mm. The
length of a straight pipe between the branch of the manifold and the IDU cannot be less than 500
mm. See Fig.4.3.5.
Fig. 4.3.5
(3) There must be three fixing point for both horizontal and vertical installation of the Y-type
manifold. See Fig. 4.3.6.
Fixing point 1: 100 mm on the main inlet manifold from the welding point
Fixing point 2: 200 mm on the main branched pipe from the welding point
Fixing point 3: 250 mm on the branched pipe from the welding point
Fig. 4.3.6
(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. 4.3.7.
30
DC Inverter VRF
Fig. 4.3.7
(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 70℃ or above, and gas pipe should bear
120℃ or above. For cooling only unit,both liquid pipe and gas pipe should bear 70℃
or above. Example: Polyethylene foam can bear 120℃ above and foaming
polyethylene can bear 100℃ above.
3) Joints at indoor and outdoor units should be wrapped with insulating material and leave
no clearance between pipe and wall. See Fig. 4.3.8.
Fig. 4.3.8
31
DC Inverter VRF
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.
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.
(2) Protection towards accidental damage should be made for outdoor pipeline. When the
pipeline exceeds 1m, a pinch 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. 4.4.1.
(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. 4.4.2.
Fig. 4.4.1
Fig. 4.4.2
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, 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
Pipeline charging amount A= ∑Liquid pipe length×refrigerant charging amount of every 1m
liquid pip.
32
DC Inverter VRF
Diameter of liquid
pipe (mm)
Φ28.6
Φ25.4
Φ22.2
Φ19.05
Φ15.9
Φ12.7
Φ9.52
Φ6.35
kg/m
0.680
0.520
0.350
0.250
0.170
0.110
0.054
0.022
(2) ∑Refrigerant charging amount B of every module
Refrigerant charging amount B of every
module(kg)②
IDU/ODU rated capacity
collocation ratio C ①
50%≤C≤70%
70%<C≤90%
90%<C≤105%
105%<C≤135%
Module capacity(kW)
Quantity of
included IDUs
22.4
28.0
33.5
40.0
45.0
50.4
56.0
61.5
<4
≥4
<4
≥4
<4
≥4
<4
≥4
0
0.5
0.5
1.0
1.0
2.0
2.0
3.5
0
0.5
0.5
1.0
1.0
2.0
2.0
3.5
0
0.5
1.0
1.5
1.5
3.0
2.5
4.0
0
0.5
1.5
2.0
2.0
3.5
3.0
5.0
0
0.5
1.5
2.0
2.0
3.5
3.0
5.0
0
0.5
1.5
2.5
2.5
4.0
3.5
5.5
0
1.0
2.0
3.0
3.0
4.5
4.0
6.0
0
1.5
2.0
3.5
3.5
5
4.0
6.0
Note:
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 refrigerant 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:
Outdoor unit consists of one 28kW module and one 45kW module. Five 14kW duct type units
are used as indoor units.
IDU/ODU rated capacity collocation ratio C= 14.0×5/(28.0+45.0)=96%. The quantity of
included IDUs is more than 4 sets. Please refer to the above table.
Additional refrigerant quantity B for 28kW module is 2.0kg.
Additional refrigerant quantity B for 45kw module is 3.5kg.
So, ∑Refrigerant charging amount B of every module=2.0+3.5=5.5kg
Suppose the Pipeline charging amount A=∑Liquid pipe length×refrigerant charging amount of
every 1m liquid pipe=20kg
Total refrigerant charging amount R=20+5.5=25.5kg
For example 2:
Outdoor unit is a 45kW module and the indoor unit is a 45kW fresh air unit. The quantity (B) of
refrigerant added to this module is 0kg.
So, ∑Refrigerant charging amount B of every module= 0kg
Suppose the Pipeline charging amount A=∑Liquid pipe length×refrigerant charging amount of
every 1m liquid pipe = 5kg
Total refrigerant charging amount R = 5+0=5kg
Modular combination of outdoor unit subjects to combinations that is currently available.
33
DC Inverter VRF
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 can not 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)AOU series VRF 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.
Fig. 4.4.3
① Flow direction of refrigerant leakage.
② 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.
34
DC Inverter VRF
4.5 Electric Wiring
4.5.1 Wiring precautions
 Wiring should conform to national rules. All the parts, materials, electric work should be in
accordance with local codes.
 Rated voltage and exclusive power supply should be used.
 Power cord should be fixed soundly and reliable. Never forcibly pull the power cord.
 Wire size of power cord should be large enough. The damaged power cord and connecting
wire should be replaced by exclusive cable.
 All the electrical work should be performed by professional personnel as per local law,
regulation and this manual.
 Connect the unit to the special earthing device and make sure the unit is earthed soundly.
 Circuit breaker and circuit breaker is required to be set. Circuit breaker 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.
 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. 4.5.1.
Fig. 4.5.1
Please refer to the following table for circuit breaker and circuit breaker for modular outdoor
units. 5-core cable is used and the wire size unit is mm2.
AOU-224VRDC3A
Circuit
Circuit breaker
break
capacity for
Basic models
er
combined units
capac
(A)
ity (A)
AOU-224VRDC3A 20
20
AOU-280VRDC3A
AOU-280VRDC3A
25
25
2.5
2.5×5
AOU-335VRDC3A
AOU-335VRDC3A
32
32
4.0
4.0×5
AOU-400VRDC3A
AOU-400VRDC3A
40
40
6.0
6.0×5
AOU-450VRDC3A
AOU-450VRDC3A
40
40
6.0
6.0×5
AOU-504VRDC3A
AOU-504VRDC3A
50
50
10
10×5
AOU-560VRDC3A
AOU-560VRDC3A
63
63
10
10×5
AOU-1350VRDC3A AOU-1350VRDC3A
63
63
10
10×5
Model
35
Wire size of
power supply
(mm2)
Wire size of combined uni
(mm2)
2.5
2.5×5
DC Inverter VRF
Circuit
Circuit breaker
break
capacity for
er
combined units
capac
(A)
ity (A)
63
25 + 40
Wire size of
power supply
(mm2)
Wire size of combined uni
(mm2)
2.5 + 6.0
2.5×5 + 6.0×5
25 + 40
2.5 + 6.0
2.5×5 + 6.0×5
80
25 + 50
2.5 + 10
2.5×5 + 10×5
280+560
80
25 + 63
2.5 + 10
2.5×5 + 10×5
280+615
80
25 + 63
2.5 + 10
2.5×5 + 10×5
AOU-960VRDC3A
335+615
80
32 + 63
4.0 + 10
4.0×5 + 10×5
AOU-1010VRDC3A
400+615
100
40 + 63
6.0 + 10
6.0×5 + 10×5
AOU-1065VRDC3A
450+615
100
40 + 63
6.0 + 10
6.0×5 + 10×5
AOU-1130VRDC3A
504+615
125
50 + 63
10 + 10
10×5 + 10×5
AOU-1180VRDC3A
560+615
125
63 + 63
10 + 10
10×5 + 10×5
AOU-1235VRDC3A
615+615
125
63 + 63
10 + 10
10×5 + 10×5
AOU-1300VRDC3A
280+450+560
125
25 + 40 + 63
2.5 + 6.0 + 10
2.5×5 + 6.0×5 +10×5
AOU-1350VRDC3A
280+450+615
125
25 + 40 + 63
2.5 + 6.0 + 10
2.5×5 + 6.0×5 + 10×5
AOU-1410VRDC3A
335+450+615
125
32 + 40 + 63
4.0 + 6.0 + 10
4.0×5 + 6.0×5 + 10×5
AOU-1460VRDC3A
280+560+615
160
25 + 63 + 63
2.5 + 10 + 10
2.5×5 + 10×5 + 10×5
AOU-1515VRDC3A
280+615+615
160
25 + 63 + 63
2.5 + 10 + 10
2.5×5 + 10×5 + 10×5
AOU-1580VRDC3A
335+615+615
160
32 + 63 + 63
4.0 + 10 + 10
4.0×5 + 10×5 + 10×5
AOU-1630VRDC3A
400+615+615
160
40 + 63 + 63
6.0 + 10 + 10
6.0×5 + 10×5+ 10×5
AOU-1685VRDC3A
450+615+615
160
40 + 63 + 63
6.0 + 10 + 10
6.0×5 + 10×5 + 10×5
AOU-1750VRDC3A
504+615+615
160
50 + 63 + 63
10 + 10 +10
10×5 + 10×5 + 10×5
AOU-1800VRDC3A
560+615+615
180
63 + 63 + 63
10 + 10 +10
10×5 + 10×5 + 10×5
AOU-1845VRDC3A
615+615+615
180
63+63+63
10+10+10
10×5+10×5+10×5
Model
Basic models
AOU-680VRDC3A
280+400
AOU-730VRDC3A
280+450
63
AOU-785VRDC3A
280+504
AOU-850VRDC3A
AOU-900VRDC3A
AOU-1908VRDC3A 280+450+560+615
180
25+40+63+63 2.5+6.0+10+10 2.5×5+6.0×5+10×5+10×5
AOU-1962VRDC3A 280+504+560+615
180
25+50+63+63
2.5+10+10+10
2.5×5+10×5+10×5+10×5
AOU-2016VRDC3A 280+560+560+615
200
25+63+63+63
2.5+10+10+10
2.5×5+10×5+10×5+10×5
AOU-2072VRDC3A 280+ 560+615+615
200
25+63+63+63
2.5+10+10+10
2.5×5+10×5+10×5+10×5
AOU-2128VRDC3A 280+615+615+615
200
25+63+63+63
2.5+10+10+10
2.5×5+10×5+10×5+10×5
AOU-2184VRDC3A 335+615+615+ 615
200
32+63+63+63
4.0+10+10+10
4.0×5+10×5+10×5+10×5
AOU-2240VRDC3A 400+615+615+615
200
40+63+63+63
6.0+10+10+10
6.0×5+10×5+10×5+10×5
AOU-2295VRDC3A 450+615+615+615
225
40+63+63+63
6.0+10+10+10
6.0×5+10×5+10×5+10×5
AOU-2350VRDC3A 504+615+615+615
225
50+63+63+63
10+10+10+10
10×5+10×5+10×5+10×5
AOU-2405VRDC3A 560+615+615+615
225
63+63+63+63
10+10+10+10
10×5+10×5+10×5+10×5
AOU-2460VRDC3A 615+615+615+615
225
63+63+63+63
10+10+10+10
10×5+10×5+10×5+10×5
Note:
① “280+400”: indicates the combination of AOU-280VRDC3A and AOU-400VRDC3A unit.
② Specification of circuit breaker and power cord is selected on the basis of unit’s maximum
power (max. current).
③ Specification of power cord is based on the working condition where ambient temperature
is 40℃ and multi-core copper cable (working temperature is 90℃) is lying on the surface
of slot (IEC 60245). If working condition changes, please adjust the specification
according to standard IEC 60245. Power cord used for outdoor unit should not be below
standard 60245 IEC57.
36
DC Inverter VRF
④ Copper-core cable must be used.
⑤ The above sectional area is suitable for a maximum distance of 15m. If it’s over 15m,
sectional area must be expanded to prevent overload current from burning the wire or
causing fire hazard.
⑥ Specification of circuit breaker is based on the working condition where the ambient
temperature of circuit breaker is 40℃. If working condition is different, please adjust the
specification according to national standard.
⑦ The circuit breaker should include magnetic trip function and thermal trip function so that
system can be protected from short circuit and overload.
⑧ An all-pole disconnection switch having a contact separation of at least 3mm in all poles
should be connected in fixed wiring
4.5.3 Connection of power cord
Warning: before obtaining access to terminals, all supply circuits must be disconnected.
Note:
(1) If units are type I electrical appliances, they must be reliably grounded.
(2) Ground resistance must be in accord with requirements of local standard.
(3) The green-yellow wire within units are ground wire. Do not use it for other purposes. Nor
should it be cut off or secured by tapping screws. Otherwise, it may cause electric shock.
(4) 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.
Power cord and communication wire should be separated, with a distance of more than 20cm.
Otherwise, system’s communication may not work well.
(5) 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, N of power cord and ground wire separately to the positions on wiring
board (for power supply) that are marked with L1, L2, L3, N 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:
Wiring method for the power cord of AOU-224VRDC3A,AOU-280VRDC3A,AOU-335VRDC3A,
AOU-400VRDC3A and AOU-450VRDC3A
37
DC Inverter VRF
Fig. 4.5.2
38
DC Inverter VRF
Wiring method for the power cord of AOU-504VRDC3A, AOU-560VRDC3A and
AOU-615VRDC3A
4.6 System Communication
Fig. 4.5.3
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
39
DC Inverter VRF
Fig. 4.6.1
4.6.2 Communication mode
CAN bus mode is taken for communication between IDU and ODU and communication
among IDUs.
4.6.3 Selection and connection mode
4.6.3.1 Select communication material
Note: 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.
(60227 IEC 52
/60227 IEC 53)
Total length of
communication line
between IDU unit and
wired controller L (m)
L≤250
Wire size
(mm2)
Material
standard
Remarks
1. Total length of communication line
can't exceed 250m.
2. The cord shall be Circular cord (the
IEC
2×0.75~2×1.25
cores shall be twisted together).
60227-5:2007
3. If unit is installed in places with intense
magnetic field or strong interference, it is
necessary to use shielded wire.
40
DC Inverter VRF
Graphic of connection between IDU and wired controller
Fig. 4.6.2
(2) Select communication wire between ODU and IDU
Material Type
Light/Ordinary
polyvinyl chloride
sheathed cord.
(60227 IEC 52
/60227 IEC 53)
Total Length L(m) of
Communication Cable
between IDU Unit and
IDU (ODU ) Unit
L≤1000
Wire size
(mm2)
Material
Standard
Remarks
1. If the wire diameter is enlarged to 2 × 1
mm2, the total communication length can
reach 1500m.
IEC
2. The cord shall be Circular cord (the
≥2×0.75
60227-5:2007 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. 4.6.3
4.6.3.2 Connection mode of communication
(1) All communication wires of AOU must be connected in series rather than in star.
Fig. 4.6.4
41
DC Inverter VRF
Fig. 4.6.5
Fig. 4.6.6
(2) All communication wires of AOU are connected by screws.
Fig. 4.6.7
(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.
42
DC Inverter VRF
4.6.4 Communication address
Auto addressing technology is adopted for AOU 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).
Note: 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 AOU Installation and Maintenance Manual.
4.7 Connection Method and Steps for System Communication
4.7.1 Communication connection between IDU and ODU
Note: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. 4.7.1 Connection of single unit
43
DC Inverter VRF
Fig. 4.7.2 Connection of modular units
Note:
①For 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).
②For 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).
③Communication wire and power cord must be separated.
④Communication 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).
44
DC Inverter VRF
4.7.2 Communication connection between IDU and wired controller
There are four kinds of connection between IDU and wired controller, as shown below:
Fig. 4.7.3 One wired controller controls one IDU Fig. 4.7.4 Two wired controllers control one IDU
Fig. 4.7.5 One wired controller controls multiple IDUs
Fig. 4.7.6 Two wired controllers control multiple IDUs
45
DC Inverter VRF
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 o
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)
Fig. 4.7.7
46
DC Inverter VRF
Note:
①Wired controller and light board remote receiver can be used at the same time.
②When light board remote receiver is used, please use remote controller at the same time.
4.7.4 Communication connection of central controlling units
Note: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)
Fig. 4.7.8
47
DC Inverter VRF
4.8 External Electrical Wiring Diagram
Every unit should be equipped with a circuit breaker for short-circuit and overload protection.
In general, circuit breaker is at OFF status. 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. 4.8.1
Note: maximum number of IDU is based upon ODU capacity. For details, please refer to the
introduction of units’ combination.
48
DC Inverter VRF
4.8.2 External wiring diagram of modular connection
Fig. 4.8.2
Note: 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.
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.
49
Check
DC Inverter VRF
Check Items
Conditions Might Happen
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 can not run normally. Communication
malfunction might happen.
Is the address code of indoor units and wired
controller correct?
The unit can not run normally. Communication
malfunction might happen.
Has the communication line been connected
correct?
The unit can not run normally. Communication
malfunction might happen.
Is the piping connection and valve status right?
The unit can not 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
Note: 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.
(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.
50
DC Inverter VRF
Fig. 5.2.1
(2) When debugging starts, system will operate according to the ambient temperature.
When outdoor temperature is above 20℃, debugging shall be in cooling mode.
When outdoor temperature is below 20℃, 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).
Fig. 5.2.2
(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
——
progress
01_Set up
master unit
Debugging
code
Progress code
Status code
LED1
LED2
LED3
Code
Display
Display
code
status
status
Meaning
Code
Display
status
db
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.
51
DC Inverter VRF
Description of each stage of debugging progress
——
progress
02_Allocate
addresses
03_Confirm the
quantity of
modules
04_Confirm the
quantity of IDUs
05_Detect
internal
communication
06_Detect
outdoor
components
07_Detect indoor
components
08_Confirm
preheated
compressor
Debugging
code
Progress code
Status code
LED1
LED2
LED3
Code
Display
Display
code
status
status
Meaning
Code
Display
status
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.
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”.
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.
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.
52
DC Inverter VRF
Description of each stage of debugging progress
——
progress
09_Refrigerant
judgments
before startup
10_Status
judgments of
outdoor valves
before startup
Debugging
code
Progress code
Status code
LED1
LED2
LED3
Code
Display
Display
code
status
status
Meaning
Code
Display
status
db
light
09
light
U4
light
System refrigerant is not enough.
System downtime equilibrium pressure is
lower than 0.3MPa.
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.
db
light
11
light
AE
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).
12_Confirm
debugging
startup
db
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.
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.
11_Calculate
refrigerant
quantity
manually
15_Cooling
debugging
db
light
15
light
XXXX/U8
53
DC Inverter VRF
Description of each stage of debugging progress
——
progress
16_Heating
debugging
Debugging
code
Progress code
Status code
LED1
LED2
LED3
Code
Display
Display
code
status
status
Meaning
Code
Display
status
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
01~04
finished
light
light
16
OF
light
XXXX/U8
light
OF
5.2.2.2 Debugging operation mode
AOU 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;
54
DC Inverter VRF
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:
Debugging
Code
LED1
Progress
Progress Code
Status Code
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.
01_01 Set
up master
unit:
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
Function code
Display mode
db
light
Current
progress
02
LED3
Display mode
Current status
Display mode
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.
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
db
light
03
light
Code
Quantity of
modules
Display
status
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
db
light
Code
Display
status
Code
Display
status
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.
55
DC Inverter VRF
Step 8: in progress 04, the quantity of IDUs needs to be confirmed manually. Main board of
each module will display:
Progress
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
04_Confirm the
quantity of IDUs
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
Debugging code
Progress code
Status code
LED1
LED2
LED3
Code
Display
status
db
Light
04_Confirm the
quantity of IDUs
Code
Display
status
Code
Display
status
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.
——
Debugging code Progress code
LED1
progress
05_Detect
internal
communication
Code
Display
status
db
Light
Status code
LED2
LED3
code
Display
status
Code
Display
status
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:
——
progress
05_Detect
internal
communication
Debugging code
Progress code
Status code
LED1
LED2
LED3
Code
Display
status
db
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”.
Elimination methods of above errors can be found in Troubleshooting.
Step 10: progress 06 is “Detect outdoor components”
56
DC Inverter VRF
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
Code
Display
status
db
Light
Status code
LED2
LED3
Meaning
code
Display
status
Code
Display
status
06
Light
OC
Light
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
Display
status
db
Light
Status code
LED2
LED3
Meaning
code
Display
status
Code
Display
status
06
Light
Error
code
Light
System detects error in outdoor
components.
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
Code
Display
status
db
Light
Status code
LED2
LED3
Meaning
code
Display
status
Code
Display
status
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
Display
status
db
Light
Status code
LED2
LED3
Meaning
code
Display
status
Code
Display
status
07
Light
XXXXor
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.
Elimination methods of above error can be found in Troubleshooting.
57
DC Inverter VRF
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
Code
Display
status
db
Light
Status code
LED2
LED3
code
Display
status
Code
Display
status
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.
——
Debugging code Progress code
LED1
progress
08_Confirm
preheated
compressor
Code
Display
status
db
Light
Status code
LED2
LED3
code
Display
status
Code
Display
status
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
Code
Display
status
db
Light
Status code
LED2
LED3
code
Display
status
Code
Display
status
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
Code
Display
status
db
Light
Status code
LED2
LED3
code
Display
status
Code
Display
status
09
Light
O4
Light
Meaning
System refrigerant is not enough. System
downtime equilibrium pressure is lower
than 0.3MPa.
Step 14: progress 10 is “Status judgments of outdoor valves before startup”
If master unit displays below, status judgments are enabled.
58
DC Inverter VRF
——
Debugging code Progress code
LED1
progress
10_Status
judgments of
outdoor valves
before startup
Code
Display
status
db
Light
Status code
LED2
LED3
code
Display
status
Code
Display
status
10
Light
ON
Light
Meaning
Outdoor valves are being turned on.
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
Code
Display
status
db
Light
Status code
LED2
LED3
code
Display
status
Code
Display
status
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
Code
Display
status
db
Light
Status code
LED2
LED3
code
Display
status
Code
Display
status
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
Code
Display
status
db
Light
Status code
LED2
LED3
code
Display
status
Code
Display
status
12
Light
AP
Blink
Meaning
Ready for units to start debugging.
If it’s confirmed, press SW7 confirmation button. Unit will display as below and start next
progress.
59
DC Inverter VRF
——
Debugging code Progress code
LED1
progress
12_Status
judgments of
outdoor valves
before startup
Code
Display
status
db
Light
Status code
LED2
LED3
Meaning
code
Display
status
Code
Display
status
12
Light
AE
Light
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:
——
progress
15_Cooling
debugging
Debugging
code
Progress code
Status code
LED1
LED2
LED3
Code
Display
Display
code
status
status
Meaning
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
60
DC Inverter VRF
B If heating mode is selected, relevant display is as below:
——
progress
16_Heating
debugging
Debugging
code
Progress code
Status code
LED1
LED2
LED3
Display
Display
code
status
status
Code
Meaning
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.
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.
db
Light
16
Light
XXXX/U8
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:
——
progress
17_Debugging
finished
Debugging code
Progress code
Status code
LED1
LED2
LED3
Code
Display
status
01-04
Light
code
Display
status
Code
Display
status
OF
Light
OF
Light
Meaning
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
DC Inverter VRF
5.2.3 Appendix: judgment reference of normal operational parameters
Reference of Debug Parameters of AOU DC Inverter Multi VRF System
No.
Debug item
Parameter name
Unit
Reference
——
1
Outdoor ambient temp
℃
2
Discharge tube temp of
inverter compressor 1
3
Casing top temp of
inverter compressor 1
4
Discharge tube temp of
inverter compressor 2
5
Casing top temp of
inverter compressor 2
℃ ●When system compressor starts up, temp of discharge
tube or casing top in cooling mode is within 70~95℃ , and
at least 10℃ higher than system high pressure saturation
℃ temp; Temp in heating mode is within 65℃~80℃ , and at
least 10℃ higher than system high pressure saturation
℃ temp.
●When inverter compressor starts but inverter compressor 2
stops, the discharge tube temperature of inverter
℃ compressor 2 is almost the same with ambient temp.
6
7
8
System
ODU
parameters
Defrost temp 1
●In cooling mode, defrost temp1 is 5~11℃ lower than
system high pressure value;
℃
●In heating mode, defrost temp1 is about 2℃ different from
system low pressure value.
System high pressure
●System’s normal high pressure value is within 20℃ ~25℃.
According to the change in ambient temp and system
operational capacity, system’s high pressure value is 10
~40℃ higher than ambient temp The higher ambient temp
℃ is, the smaller temp difference is.
●When ambient temp is 25~35℃, system’s high pressure
value in cooling mode is 44~53℃.
●When ambient temp is -5~10℃, system’s high pressure
value in heating mode is 40~52℃.
System low pressure
●When ambient temp is 25~35℃, system’s low pressure
value in cooling mode is 0~8℃.
℃
●When ambient temp is -5~10℃, system’s low pressure
value in heating mode is -15~5℃.
9
●In cooling mode, heating electronic expansion valve
Opening angle of heating
remains 480PLS.
PLS
EXV
●In heating mode, the opening angle of adjustable electronic
expansion valve varies within 120~480PLS.
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 25A.
12
IPM temp of inverter
compressor 1
℃
●When ambient temp is lower than 35℃, IPM temp is below
80℃. Highest temp won’t be above 95℃.
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 390v, then the bus
voltage after rectification is: 390v X 1.414=551v. 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
15
Current of inverter
compressor 2
A
●According to different operating freq. and different load,
current will vary from 7A to 20A.
16
IPM temp of inverter
compressor 2
℃
●When ambient temp is lower than 35℃, IPM temp is below
80℃. Highest temp won’t be above 95℃.
17
Inverter compressor 2
driven bus voltage
V
●Normal bus voltage is 1.414 times of power voltage. For
example, if 3-phase power voltage is 390v, then the bus
voltage after rectification is: 390v X 1.414=551v. It’s normal
if actual voltage varies 15v from the calculated voltage.
62
DC Inverter VRF
Reference of Debug Parameters of AOU DC Inverter Multi VRF System
No.
Debug item
Parameter name
Unit
Reference
Operating freq of fan
motor 1
Hz Adjusts in 0~65Hz according to system pressure.
Current of fan motor 1
A
20
Operating freq of fan
motor 2
Hz ●Adjusts in 0~65Hz according to system pressure.
21
Current of fan motor 2
A
Ambient temp of IDU
℃ ——
Inlet tube temp of indoor
heat exchanger
℃
18
19
22
ODU
System
parameters
23
IDU
●According to different ambient temp, for a same IDU under
cooling mode, inlet tube temp will be 1 ~7℃ lower than
outlet tube temp.
●For a same IDU under heating mode, inlet tube temp will
℃
be 10 ~20℃ lower than outlet tube temp.
24
Outlet tube temp of
indoor heat exchanger
25
Opening angle of indoor
PLS Adjusts opening angle automatically in 200~2000PLS.
EXV
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
——
℃
Communication data
—
●Quantity of IDU and ODU detected by software is the same
with actual quantity. No communication error.
●Compressor and indoor/outdoor fan motor has no strange
noise. Unit operates normally.
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
immediately
blocked
Remove obstruction
Air intake or outlet of indoor or outdoor unit is
blocked
Remove obstruction
Improper temperature setting
Adjust setting at wireless remote controller
or wired controller
Fan speed is set too low
Adjust setting at wireless remote controller
or wired controller
Abnormal cooling
Wind direction is not correct
or heating
Adjust setting at wireless remote controller
or wired controller
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
63
DC Inverter VRF
Note:
①When 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 AOU Installation and Maintenance
Manual.
②If problem can not be solved after checking the above items, please contact ALPICAIR service
center and show phenomena and models.
Following circumstance are not malfunction.
Reason
“Malfunction”
Unit doesn’t run
Mist comes from
the unit
When unit is started immediately after it is just
turned off
Overload protection switch makes it run
after 3 minutes delay
When power is turned on
Standby operating for about 1 minute
Under cooling
Indoor high humidity air is cooled rapidly
Slight cracking sound is heard when just turned It is noise when electronic expansion valve
on
initialization
Noise is emitted
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 unit That's sound for operation of drainage
is running or after running
system
Cracking sound is heard when unit is operating
and after operating
That’s sound caused by expansion of panel
and other parts due to temperature change
The unit blows out When unit runs after no operation for a long
duct
period
Dust in indoor unit is blew out
The unit emits odor Operating
The room odor absorbed by the unit is blew
out again
Indoor unit still
runs after switch
off
Mode conflict
Indoor fan motor will keep running 20-70s so
After every indoor unit receive "stop" signal, fan
as to take good use of excess cooling and
will keep running
heating and prepare for next operation
COOL or HEAT mode can not be operated
64
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.
DC Inverter VRF
7 Error Indication
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
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
65
DC Inverter VRF
Outdoor:
Error Code
Content
Error Code
Content
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
bH
Clock of system is abnormal
bE
Malfunction of inlet tube temperature
sensor of condenser
P0
P1
malfunction of driving board of
compressor
Driving board of compressor operates
abnormally
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
66
DC Inverter VRF
Error Code
Content
Error Code
Content
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
PJ
Failure startup of inverter compressor
H9
PP
AC current protection of inverter
compressor
HA
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
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
67
Drive IPM high temperature protection
of fan
Desynchronizing protection of inverter
fan
Malfunction of drive storage chip of
inverter outdoor fan
DC Inverter VRF
Debugging:
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
68
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.
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 ALPICAIR appointed service center.
69
DC Inverter VRF
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 ALPICAIR appointed service center or dealer if necessary.
Note:
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 ALPICAIR.
Warranty should meet the folowing requirements:
(1) First run of the unit should be operated by professional personnel from ALPICAIR appointed
service center.
(2) Only ALPICAIR 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.
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