DC Inverter Multi VRF System

DC Inverter Multi VRF System
DC Inverter Multi VRF System
Owner's Manual
Air Conditioners
Applicable Models:
GMV-60WL/A-T(U)
GMV-48WL/A-T(U)
GMV-36WL/A-T(U)
 Thank you for choosing Air Conditioners, please read this owner’s manual carefully before operation and
retain it for future reference.
Preface
AC PRO DC Inverter Multi VRF System, with the most advanced technologies in the world, uses eco-friendly
refrigerant R410A as its cooling medium. For correct installation and operation, please read this manual
carefully. Before reading the manual, please note that:
(1) Multi VRF system conforms to design standard: ARI 210240-2008
(2) To ensure safety when operating this system, please strictly follow the instructions in this manual.
(3) The total capacity of running indoor units must not exceed that of the outdoor units. Otherwise, the
cooling (heating) effect of each IDU would be poor.
(4) Make sure that this manual is kept by direct operators and maintainers.
(5) In case of malfunction, 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 damage or
operation failure which may be caused by improper disassembly, please do not disassemble units
by yourself. If disassembly is needed, please contact our authorized service centers.
(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.
(8) Under the standby status, the unit will consume a little power for ensuring reliability of complete unit,
maintaining normal communication and preheating refrigerant. When the unit won’t be used for a
long time, cut off the power of the complete unit. However, please preheat it when operating the
unit next time.
Contents
1 Safety Precautions ........................................................................................................................................................ 1
2 Product Introduction...................................................................................................................................................... 2
2.1 Names of Main Parts ......................................................................................................................................... 3
2.2 Combinations of Indoor and Outdoor Units ................................................................................................... 4
2.3 Operating Range................................................................................................................................................ 4
3 Preparation before Installation .................................................................................................................................... 4
3.1 Standard Parts.................................................................................................................................................... 4
3.2 Installation Site ................................................................................................................................................... 5
3.3 Piping Work Requirements ............................................................................................................................... 6
4 Installation Instruction ................................................................................................................................................... 7
4.1 Dimension of Outdoor Unit and Mounting Hole............................................................................................. 7
4.2 Connection Pipe ................................................................................................................................................. 8
4.3 Installation of Connection Pipe ...................................................................................................................... 12
4.4 Disassembly of Compressor Feet ................................................................................................................. 17
4.5 Vacuum Pumping, Refrigerant Adding.......................................................................................................... 18
4.6 Electric Wiring .................................................................................................................................................. 20
5 Check Items after Installation and Test Operation ................................................................................................. 23
5.1 Check Items after Installation ......................................................................................................................... 23
5.2 Test operation and debugging........................................................................................................................ 24
6 Common Malfunctions and Troubleshooting .......................................................................................................... 28
7 Error Indication ............................................................................................................................................................ 29
8 Function Setting of Outdoor Unit .............................................................................................................................. 33
8.1 ODU Quiet Function ........................................................................................................................................ 33
8.2 Cool & Heat Function ...................................................................................................................................... 34
8.3 Forced Defrosting ............................................................................................................................................ 35
8.4 Restore Factory Defaults ................................................................................................................................ 35
8.5 Static Pressure Function ................................................................................................................................. 35
9 Maintenance and Care ............................................................................................................................................... 36
9.1 Outdoor Heat Exchanger ................................................................................................................................ 36
9.2 Drain Pipe ......................................................................................................................................................... 36
9.3 Notice before Seasonal Use .......................................................................................................................... 36
9.4 Maintenance after Seasonal Use .................................................................................................................. 36
9.5 Parts Replacement .......................................................................................................................................... 36
10 After-sales Service .................................................................................................................................................... 37
DC Inverter Multi VRF System
1 Safety Precautions
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possibleinjury or death.
This mark indicates procedures which, if improperly performed, might lead to the death or
serious injury of the user.
This mark indicates procedures which, if improperly performed, might possibly result in
personal harm to the user, or damage to property.
NOTICE is used to address practices not related to personal injury.
(1)
Instructions for installation and use of this product are provided by the manufacturer.
(2)
Installation must be performed in accordance with the requirements of NEC and CEC by authorized
personnel only.
(3)
For operating the air conditioner pleasantly, install it as outlined in this installation manual.
(4)
Connect the indoor unit and outdoor unit with the room air conditioner piping and cord available from our
standard parts. This installation manual describes the correct connections using the installation set available
from our standard parts.
Before installation, check the power cord if it complies with the power supply requirement on the nameplate.
Make sure the power supply is safe.
(5)
(6)
This air conditioner must be properly grounded through the receptacle to avoid electric shock. The ground
wire shouldn’t be connected with gas pipe, water pipe, lightning arrester or telephone line.
(7)
If refrigerant leaks while work is being carried out, ventilate the area. If the refrigerant comes in contact with a
flame, it produces toxic gas.
(8)
Do not power on until all installation work is complete.
(9)
During installation, make sure that the refrigerant pipe is attached firmly before you run the compressor.
Do not operate the compressor under the condition of refrigerant piping not attached properly with gas pipe
and liquid pipe valve open.
This may cause abnormal pressure in the refrigeration cycle that leads to breakage and even injury.
(10) During the pump-down operation, make sure that the compressor is turned off before you remove the
refrigerant piping.
This may cause abnormal pressure in the refrigerant cycle that leads to breakage and even injury.
(11) When installing and relocating the air conditioner, do not mix gases other than the specified refrigerant
(R410A) to enter the refrigerant cycle.
(12) If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to an abnormally high
value and cause breakage, injury, etc.
(13) This appliance is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for their safety.
(14) Children should be supervised to ensure that they do not play with the appliance.
(15) If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
(16) When installing, specialized parts and accessories must be used. Otherwise, it may result in water leakage,
electric shock or fire hazard.
(17) Diameter of power cord must be large enough. Damaged power cord or connecting wire must be replaced by
specialized electric cable.
(18) After the power cord is connected, please install the cover of electric box to avoid danger
(19) Nitrogen must be charged according to technical requirements.
(20) For units with wired controllers, do not connect power supply until the wired controller is well installed.
Otherwise, the wired controller cannot be used.
(21) When installation is finished, please check and make sure the drain pipe, pipeline and electric wire are all well
connected so as to avoid water leakage, refrigerant leakage, electric shock and fire hazard.
(22) Do not extend fingers or objects into air outlet or return air grille.
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DC Inverter Multi VRF System
(23) If you use gas heater or petroleum heater in the same room, please open the door or window to maintain
good air circulation, otherwise the room may be lack of oxygen.
(24) Never start or stop the air conditioner by inserting or removing the power cord.
(25) Do not turn off the air conditioner until it runs for at least 5 minutes. Otherwise, oil return of the compressor
will be affected.
(26) Children are not allowed to operate the air conditioner.
(27) Do not operate the air conditioner with wet hands.
(28) Please turn off and unplug your air conditioner before cleaning. Otherwise, it may cause electric shock or
personal injury.
(29) Do not spray water on the air conditioner or it will cause malfunction or electric shock.
(30) Do not expose the air conditioner directly under damp or corrosive surroundings.
(31) Connect power 8 hours before operation. Do not disconnect power when you want to stop the unit in a short
period of time, e.g. in one night. (This is for protecting the compressor.)
(32) Volatile liquid like thinner or gasoline will damage the appearance of air conditioner. (Please use soft dry cloth
and wet cloth with mild detergent to clean unit’s outer case.)
(33) Under cool mode, do not set the indoor temperature too low. Keep the difference between indoor temp and
outdoor temp within 5℃(41℉).
(34) If abnormal condition occurs (e.g. unpleasant smell), please turn off the unit at once and disconnect power
supply. Then contact AC PRO authorized service center. If the air conditioner continues to operate despite of
abnormal condition, it may be damaged and cause electric shock or fire hazard.)
(35) Do not repair the air conditioner by yourself. Improper repair will cause electric shock or fire hazard. Please
contact AC PRO authorized service center and ask professional technicians to repair it.
(36) AC PRO will not assume responsibility for any personal injury or property loss caused by improper
installation, improper debugging, unnecessary repair or not following the instructions of this manual.
2 Product Introduction
AC PRO Multi VRF System adopts inverter compressor technology. By changing the
displacement of compressor, stepless capacity regulation within range of 15%~100% can be
realized. Various product lineups are provided with capacity range from 36000Btu/h to 60000Btu/h,
which can be widely used in residential, commercial and working area and especially applicable to
places with big load change. AC PRO residential air conditioner is absolutely your best choice.
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DC Inverter Multi VRF System
2.1 Names of Main Parts
GMV-36WL/A-T(U)、GMV-48WL/A-T(U)
GMV-60WL/A-T(U)
Fig.1
No.
①
②
Name
Motor
Fan blade
③
Electric box
assembly
3
④
Gas pipe valve
⑤
Liquid pipe
valve
DC Inverter Multi VRF System
2.2 Combinations of Indoor and Outdoor Units
(1) See below the number of indoor units that can be connected to the outdoor unit.
(2) The total capacity of indoor units should be within 50%~135% of that of the outdoor unit.
Model
Min sets of connectable IDUs
Max sets of connectable IDUS
GMV-36WL/A-T(U)
2
7
GMV-48WL/A-T(U)
2
8
GMV-60WL/A-T(U)
2
13
(3) Outdoor units of DC Inverter Multi VRF System can be connected to various indoor
units. When any one of the indoor units receives operating command, outdoor unit will
start operation as per required capacity. When all indoor units stop, outdoor unit will be
shut off.
2.3 Operating Range
Cooling
Heating
Outdoor temperature: -5℃~48℃(23℉~118℉)
Outdoor temperature: -20℃~27℃(-4℉~81℉)
3 Preparation before Installation
NOTICE! Graphics here are only for reference. Please refer to actual products.
3.1 Standard Parts
Please use the supplied standard parts as required.
Parts for Outdoor Unit
No.
Name
Appearance
Qty
Remark
DC Inverter Multi VRF System
Owner's Manual
1
User Manual
Air Conditioners
Applicable Models:
GMV-60WL/A-T(U)
GMV-48WL/A-T(U)
GMV-36WL/A-T(U)
1
 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
Corrugated pipe
1
GMV-36WL/A-T(U)
GMV-48WL/A-T(U)
4
Liquid side
connection pipe
1
This part is included in the
following models:
GMV-60WL/A-T(U)
4
DC Inverter Multi VRF System
5
Gas side
connection pipe
1
6
Drainage hole cap
3
7
Drainage joint
1
This part is included in the
following models:
GMV-60WL/A-T(U)
3.2 Installation Site
(1) The unit must be installed where strong enough to withstand the weight of the unit and fixed securely,
otherwise the unit would topple or fall off.
(2) Do not install where there is a danger of combustible gas leakage.
(3) Do not install the unit near heat source, steam, or flammable gas.
(4) Children under 10 years old must be supervised not to operate the unit.
(5) Select a location which is out of children’s reach. Keep the unit away from children.
(6) Make sure the location has space for heat exchange and maintenance so that unit can operate reliably with
good ventilation.
(7) Make sure the location has space for heat exchange and maintenance so that unit can operate reliably with
good ventilation.
(8) Install the unit where it will not be tilted by more than 5°.
(9) During installation, if the outdoor unit has to be exposed to strong wind, it must be fixed securely.
(1)
If possible, do not install the unit where it will be exposed to direct sunlight. (If necessary, install a blind that
does not interfere with the air flow.)
(2)
Install ODU in a place where it will be free from getting dirty or getting wet by rain as much as possible.
(3)
Install ODU where it is convenient to connect IDU.
(4)
ODU and IDU should stay as close as possible to shorten the length of refrigerant pipe and reduce bend
angles.
(5)
Install ODU where the condensate water can be drained out freely during heating operation. Do not place
animals and plants in the path of the warm air.
(6)
Take the air conditioner weight into account and select a place where noise and vibration are small
If the ODU is totally surrounded by walls, please refer to the following figures for space dimension:
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DC Inverter Multi VRF System
Fig.2
3.3 Piping Work Requirements
Refer to the table below for piping work requirements:
R410A Refrigerant System
Outer diameter (mm/inch)
Wall thickness(mm/ inch)
Φ6.35(Φ1/4)
≥0.8(1/32)
Φ9.52(Φ3/8)
≥0.8(1/32)
Φ12.7(Φ1/2)
≥0.8(1/32)
Φ15.9(Φ5/8)
≥1.0(1/25)
Φ19.05(Φ3/4)
≥1.0(1/25)
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DC Inverter Multi VRF System
4 Installation Instruction
NOTICE! Graphics here are only for reference. Please refer to actual products.
4.1 Dimension of Outdoor Unit and Mounting Hole
Unit Outline and Installation Dimension:
Fig.3
Unit:mm(inch)
Model
A
B
C
D
E
GMV-36WL/A-T(U)
GMV-48WL/A-T(U)
900
(35-3/8)
340
(13-3/8)
1345
(53)
572
(22-1/2)
378
(15)
GMV-60WL/A-T(U)
940
(37)
320
(12 3/5)
1430
(56 2/7)
632
(24 7/8)
350
(14 7/8)
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DC Inverter Multi VRF System
4.2 Connection Pipe
4.2.1 Schematic Diagram of Piping Connection
Fig.4
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DC Inverter Multi VRF System
4.2.2 Allowable Length and Height Difference of Connection Pipe
Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is
shown in the figure below:
NOTICE! Equivalent length of one Y-type branch is 0.5m(1-5/8feet).
Fig.5 Allowable Length and Height Difference of Connection Pipe
Piping parameters of GMV-36WL/A-T(U)、GMV-48WL/A-T(U) 、GMV-60WL/A-T(U)
Allowable value
m
feet
300
984
Actual length
120
394
Equivalent length
150
492
Total length (actual length) of fitting pipe
Length of farthest fitting pipe
st
From the 1 branch to the farthest indoor pipe
Height difference between ODU
and IDU
Fitting pipe
L1+L2+L3+a+b++c+d
L1+L2+L3+d
40
131
L2+L3+d
ODU at upper
side
50
164
——
ODU at lower side
40
131
——
15
49
——
Height difference between IDUs
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DC Inverter Multi VRF System
4.2.3 Dimension of Pipe (Main Pipe) from ODU to the 1st Indoor Branch
Dimension of pipe from ODU to the 1st indoor branch will be determined by the dimension of
outdoor connection pipe.
Fig. 6
Dimension of outdoor connection pipe:
Pipe dimension
Basic module
Gas pipe
(mm/inch)
Liquid pipe
(mm/inch)
GMV-36WL/A-T(U)
φ15.9
(φ5/8)
φ9.52
(φ3/8)
GMV-48WL/A-T(U)
φ15.9
(φ5/8)
φ9.52
(φ3/8)
GMV-60WL/A-T(U)
Φ19.05
(φ3/4)
φ9.52
(φ3/8)
4.2.4 Selection of Indoor Branches
Select indoor branches according to the total capacity of downstream indoor units.
Fig.7
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DC Inverter Multi VRF System
Refrigerant system
Total capacity of downstream indoor units C (Btu/h)
Model
C< 68200
FQ01A
68200≤C≤102400
FQ01B
102400<C≤238800
FQ02
238800<C≤460600
FQ03
460600<C
FQ04
Y type branch
4.2.5 Dimension of Pipe between Indoor Branches
Select pipe between indoor branches according to the capacity of downstream indoor units; if
the capacity exceeds that of the outdoor unit, capacity of outdoor unit prevails.
Fig.8
Total capacity of downstream indoor units
C (Btu/h)
Pipe
(mm/inch)
Liquid pipe
(mm/inch)
C ≤19000
Φ12.7
(Φ1/2)
Φ6.35
(Φ1/4)
19000<C≤48500
Φ15.9
(5/8)
Φ9.52
(3/8)
48500<C≤76400
Φ19.05
(Φ3/4)
Φ9.52
(Φ3/8)
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DC Inverter Multi VRF System
4.2.6 Dimension of Pipe between Indoor Branch and IDU
Dimension of pipe between indoor branch and IDU should be consistent with the dimension of
indoor pipe.
Fig. 9
Rated capacity of IDU
C(Btu/h)
Gas pipe
(mm/inch)
Liquid pipe (mm/inch)
C≤9600
Φ9.52
(Φ3/8)
Φ6.35
(Φ1/4)
9600<C≤17000
Φ12.7
(Φ1/2)
Φ6.35
(Φ1/4)
17000<C≤48000
Φ15.9
(Φ5/8)
Φ9.52
(Φ3/8)
48000<C≤55000
Φ19.05
(Φ3/4)
Φ9.52
(Φ3/8)
55000<C≤96000
Φ22.2
(Φ7/8)
Φ9.52
(Φ3/8)
NOTICE! If the distance between IDU and its nearest branch is over 10m(33feet), then the
liquid pipe of IDU (rated capacity ≤17000Btu/h) shall be enlarged.
4.3 Installation of Connection Pipe
(1)
Conform to the following principles during pipe connection: Connection pipe should be as short as possible,
so is the height difference between indoor and outdoor units. Keep the number of bends as little as possible.
Radius of curvature should be as large as possible.
(2)
Weld the connection pipe between indoor and outdoor units. Please strictly follow the requirements for
welding process. Rosin joint or pin hole is not allowed.
(3)
When laying the pipe, be careful not to distort it. Radius of bending parts should be over 200mm(8inch). Note
that pipes cannot be repeatedly bent or stretched; otherwise the material will get harder. Do not bend or
stretch the pipe for more than 3 times at the same position.
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DC Inverter Multi VRF System
4.3.1 Flaring Process
(1) Use pipe cutter to cut the connection pipe in case it is unshaped.
(2) Keep the pipe downward in case cutting scraps get into the pipe. Clear away the burrs
after cutting.
(3) Remove the flared nut connecting indoor connection pipe and outdoor unit. Then use
flaring tool to fix the flared nut into the pipe (as shown in Fig.10).
(4) Check if the flared part is flaring evenly and if there is any crack.
Fig. 10
4.3.2 Pipe Bending
(1) Reshape the pipe by hand. Be careful not to damage the pipe.
(2) Do not bend the pipe over 90°.
(3) If pipe is repeatedly bent or stretched, it will get hard and difficult to bend and stretch
again. Therefore, do not bend or stretch the bend for over 3 times.
(4) In case that direct bending will open cracks to the pipe, first use sharp cutter to cut the
insulating layer, as shown in Fig. 12. Do not bend the pipe until it is exposed. When
bending is done, wrap the pipe with insulating layer and then secure it with adhesive
tape.
Fig. 11
Fig. 12
4.3.3 Indoor Pipe Connection
(1) Remove pipe cover and pipe plug.
(2) Direct the flared part of copper pipe to the center of screwed joint. Twist on the flared nut
tightly by hand, as in Fig. 13. (Make sure indoor pipe is correctly connected. Improper location of
the center will prevent flared nut from being securely twisted. Thread of nut will get damaged if the
flared nut is twisted forcibly.)
(3) Use torque wrench to twist on the flared nut tightly until the wrench gives out a click
sound. (Hold the handle of wrench and make it at right angle to the pipe. as in Fig. 14)
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DC Inverter Multi VRF System
(1)
Use sponge to wrap the un-insulated connection pipe and joint. Then tie the sponge tightly with plastic tape.
(2)
Connection pipe should be supported by a bearer rather than the unit.
(3)
The bending angle of piping should not be too small; otherwise the piping might have cracks. Please use a
pipe bender to bend the pipe.
(4)
When connecting IDU with connection pipe, do not pull the big and small joints of IDU with force in case the
capillary tube or other tubes have cracks and cause leakage.
Fig. 13
Fig. 14
Pipe Diameter
Tightening Torque
6mm(1/4inch)
15-30N·m(11-22ft.-1b.)
9.5mm(3/8 inch)
35-40N·m(26-29ft.-1b.)
12.7mm(1/2 inch)
45-50N·m(33-37ft.-1b.)
16mm(5/8 inch)
60-65N·m(44-48ft.-1b.)
4.3.4 Outdoor Pipe Connection
(1)Pipe connection for GMV-36WL/A-T(U)、GMV-48WL/A-T(U)
Twist the flared nut on the connection pipe of outdoor valves. Twisting method is the same as
for indoor pipe connection.
According to customer requirement or space limit, outlet pipe can be installed from the front,
right or rear side.
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DC Inverter Multi VRF System
Fig. 15
(2)Pipe connection for GMV-60WL/A-T(U)
As shown in Fig.16 and Fig.17, open the outermost soundproof cotton and place a fire
barrier between compressor and straight pipe. Use a soldering gun to unsolder straight pipe 1
and straight pipe 2. Install connection pipe 1 and connection pipe 2 to the corresponding
position and then seal the apertures with welding rod. First weld the liquid side connection
pipe and then weld the gas side connection pipe. During welding, it’s necessary to use wet
gauze to wrap up the two cut-off valves. Make sure the flame won’t burn the soundproof
cotton or other components.
Fig. 16
Fig. 17
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DC Inverter Multi VRF System
4.3.5 Installation of Y-type Branch
(1) Y-type Branch
Fig. 18
(2) Y-type branch has several pipe sections with different dimension, which facilitates to
match with various copper pipes. Use pipe cutter to cut in the middle of the pipe section that is of
proper dimension and remove burrs as well. See Fig. 19.
(3) Y-type branch must be installed vertically or horizontally.
Fig. 19
Branch shall be isolated by insulating material that can bear 120℃(248℉)or even higher temperature. The
attached foam of branch cannot be taken as insulating material.
4.3.6 Thermal Insulation for Pipeline
(1) For multi VRF system, every copper pipe should be labeled so as to avoid
misconnection.
(2) At the branch inlet, leave at least 500mm(19-3/4inch) straight pipe section.
(3) Thermal insulation for pipeline
1) To avoid condensate or water leakage on the connection pipe, the gas pipe and liquid
pipe must be wrapped with thermal insulating material and adhesive tape for insulation
from the air.
2) Joints of indoor and outdoor unit should be wrapped with insulating material and leave
no gap between pipe and wall. See Fig. 20.
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DC Inverter Multi VRF System
Fig. 20
3) When wrapping the tape, the later circle should cover half of the former one. Don’t wrap
the rape too tight, otherwise the insulation effect will be weakened.
4) After wrapping the pipe, apply sealing material to completely seal the hole on the wall.
(1)
Thermal insulating material shall be able bear the pipe temperature. For heat pump unit, liquid pipe should
bear 70℃(158℉) or above and gas pipe should bear 120℃(248℉) or above. For cooling only unit, both liquid
pipe and gas pipe should bear 70℃(158℉) or above.
(2)
Thermal insulating material of branches should be the same as that of the pipeline. The attached foam of
branches cannot be taken as insulating material.
4.3.7 Support and Protection of Pipeline
(1)
(2)
Support should be made for hanging connection pipe. Distance between each support cannot be over
1m(3-1/4feet).
Protection against accidental damage should be made for outdoor pipeline. When pipeline exceeds
1m(3-1/4feet), a pinch board should be added for protection.
4.4 Disassembly of Compressor Feet
In order to prevent unit from damage during transportation, 2 metal pieces are fitted to
outdoor unit’s compressor feet before unit leaves factory. See fig. 21.
Fig. 21
When installing the unit, metal pieces for transportation must be removed. (except for
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DC Inverter Multi VRF System
GMV-60WL/A-T(U)).Then fasten the binding nuts again and wrap back soundproofing cotton.If
unit runs with metal pieces fitting on, compressor will shake abnormally and unit’s operating life
will be shortened.
4.5 Vacuum Pumping, Refrigerant Adding
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation! There is no extra
refrigerant in the outdoor unit for air purging!
4.5.1 Vacuum Pumping
(1) Outdoor unit has been charged with refrigerant before delivery. Field-installed
connection pipe needs to be charged with additional refrigerant.
(2) Confirm whether outdoor liquid and gas valves are closed.
(3) Use vacuum pump to withdraw the air inside indoor unit and connection pipe from the
outdoor valve, as shown below.
Fig. 22
4.5.2 Refrigerant Adding
(1) Refrigerant quantity of outdoor unit before delivery:
Model
GMV-36WL/A-T(U)
GMV-48WL/A-T(U)
GMV-60WL/A-T(U)
Refrigerant Qty (kg/oz)
5.0
(176)
5.0
(176)
6.5
(229)
(1) The refrigerant amount charged before delivery doesn’t include the amount that needs to be
added to indoor units and the connection pipeline.
(2) Length of connection pipe is decided on site. Therefore the amount of additional refrigerant
shall be decided on site according to the dimension and length of field-installed liquid pipe.
(3) Record the amount of additional refrigerant for convenience of after-sales service.
(2) Calculation of the amount of additional refrigerant
Calculation method of the quantity of additional refrigerant (based on liquid pipe)
Quantity of additional refrigerant = ∑length of liquid pipe X quantity of additional refrigerant per
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DC Inverter Multi VRF System
meter(39-3/8inch)
Diameter of
liquid pipe
(mm/inch)
Φ22.2
(Φ7/8)
Φ19.05
(Φ3/4)
Φ15.9
(Φ5/8)
Φ12.7
(Φ1/2)
Φ9.52
(Φ3/8)
Φ6.35
(Φ1/4)
kg/m
0.35
0.25
0.17
0.11
0.054
0.022
oz/inch
0.314
0.224
0.152
0.099
0.048
0.020
NOTICE! Liquid pipe that is within 20m(65-5/8feet) doesn’t need to be added with
refrigerant.
First confirm that there is no leakage from the system. When compressor is not working,
charge additional R410a with specific amount to the unit through the filling opening of the liquid
pipe valve of the outdoor unit. If required amount cannot be quickly filled due to pressure increase
of the pipe, then set the unit in cooling startup and fill refrigerant from the low pressure check valve
of the outdoor unit.
(3) Calculation example
Fig. 23
IDU
No.
IDU ①
IDU ②
IDU ③
IDU ④
Model
Duct type
GMV-ND18PLS/A-T(U)
Duct type
GMV-ND12PLS/A-T(U)
Duct type
GMV-ND09PLS/A-T(U)
Duct type
GMV-ND09PLS/A-T(U)
Liquid pipe:
No.
A
B
C
D
Pipe size
φ9.52mm
(φ3/8inch)
φ9.52mm
(φ3/8inch)
φ9.52mm
(φ3/8inch)
φ6.35mm
(φ1/4inch)
Length
10m
(32-3/4feet)
5m
(16-3/8feet)
5m
(16-3/8feet)
5m
(16-3/8feet)
No.
a
b
c
d
Pipe size
φ9.52mm
(φ3/8inch)
φ6.35mm
(φ1/4inch)
φ6.35mm
(φ1/4inch)
φ6.35mm
(φ1/4inch)
Length
3m
(9-3/4feet)
3m
(9-3/4feet)
2m
(6-5/8feet)
1m
(3-1/4feet)
Total length of each liquid pipe
φ9.52:A+B+C+a=10+5+5+3=23m(75-1/2 feet)
19
DC Inverter Multi VRF System
φ6.35: D+b+c+d=5+3+2+1=11m(36feet)
NOTICE! Liquid pipe that is within 20m(65-5/8 feet) doesn’t need to be added with
refrigerant.
Therefore, the minimum quantity of additional refrigerant = (23-20)×0.054+11×0.022=
0.404kg(14oz)
4.6 Electric Wiring
(1)
All electrical installation must be performed by qualified technicians in accordance with local laws, regulations
and this user manual.
(2)
Use air conditioner specialized power supply and make sure that it is consistent with system’s rated voltage.
(3)
Do not pull the power cord with force.
(4)
Caliber of the power cord must be large enough. A damaged power cord or connection wire must be replaced
by specialized electrical cords.
Connect the unit to specialized grounding device and make sure it is securely grounded. It’s a must to install
air switch and current circuit breaker that can cut off the power of the entire system. The air switch should
include magnetic trip function and thermal trip function so that system can be protected from short circuit and
overload.
(5)
(6)
Air conditioner belongs to class I electrical appliance, so it must be securely grounded.
(7)
The yellow-green wire inside the unit is a ground wire. Do not cut it off or secure it with tapping screws,
otherwise it will lead to electric shock.
Power supply must include secure grounding terminal. Do not connect the ground wire to the following:
①Water pipe; ②Gas pipe; ③Drain pipe; ④Other places that are deemed as not secure by professional
technicians.
(8)
4.6.1 Electrical Wiring
(1). For solid core wiring (Fig.24)
1) Cut the wire end with a wire cutter or wire-cutting pliers, then strip the insulation
about 25mm (15/16inch) .
2) Using a screwdriver, remove the terminal screw(s) on the terminal board.
3) Using pliers, bend the solid wire to form a loop suitable for the terminal screw.
4) Shape the loop wire properly, place it on the terminal board and tighten securely
with the terminal screw using a screwdriver.
(2). For strand wiring (Fig. 25)
1) Cut the wire end with a wire cutter or wire-cutting pliers, then strip the insulation
about 10mm (3/8inch) .
2) Using a screwdriver, remove the terminal screw (s) on the terminal board.
3) Using a round terminal fastener or pliers, securely clamp a round terminal to each
stripped wire end.
4) Position the round terminal wire, and replace and tighten the terminal screw with a
screwdriver.(Fig. 25)
20
DC Inverter Multi VRF System
Fig. 24
Fig. 25
Fig. 26
(3). How to fix connection cord and power cord by cord clamp
After passing the connection cord and power cord through the insulation tube, fasten it with the
cord clamp.(Fig. 26)
(1)
Before starting work, check that power is not being supplied to the indoor unit and outdoor unit.
(2)
Match the terminal block numbers and connection cord colors with those of the indoor unit side.
Erroneous wiring may cause burning of the electric parts.
(3)
Connect the connection cords firmly to the terminal block. Imperfect installation may cause a fire.
(4)
Always fasten the outside covering of the connection cord with cord clamps. (If the insulator is not clamped,
electric leakage may occur.)
21
DC Inverter Multi VRF System
(5)
Always connect the ground wire.
4.6.2 Wiring Diagram
(1) Connection of power cord and communication wire
Separate power supply for IDU and ODU
Fig.27 Connection of power cord and communication wire for IDU and ODU
(2) The wiring diagram for power cord of outdoor unit and communication wire.
Fig.27
22
DC Inverter Multi VRF System
There are two wiring diagrams for communication wires of indoor/outdoor units and remote
monitor:
1.Real line method;
2. Broken line method. Please select it based on the actual installation situation.
There are two wiring diagrams for power cord:
1.Real line method;
2.Broken line method. Please select it based on the actual installation situation.
(3) Selection of air switch and power cord:
Power supply
Max Fuse
Size/Fusible
Max.
(A)
Max Ckt, Bkr
Size/Disjoncteur Max.
(A)
Min. Circuit Ampacity
(A)
GMV-36WL/A-T(U)
208/230V~ 60Hz
50
50
32
GMV-48WL/A- T(U)
208/230V~ 60Hz
60
60
37
GMV-60WL/A- T(U)
208/230V~ 60Hz
70
70
42
Model
(1)
(2)
(3)
Selection of circuit breaker and power cord in the above table is based upon unit’s maximum power
(maximum current).
Specification of power cord is based on the working condition where ambient temperature is 40℃(104℉) and
multi-core copper cable (working temperature is 90℃(194℉), e.g. power cable with YJV cross-linked copper,
insulated PE and PVC sheath) is lying on the surface of slot. If working condition changes, please adjust the
specification according to national standard.
Specification of circuit breaker is based on the working condition where ambient temperature of circuit
breaker is 40℃(104℉). If working condition changes, please adjust the specification according to national
standard.
5 Check Items after Installation and Test Operation
5.1 Check Items after Installation
Check items
Possible conditions due to improper
installation
Each part of the unit is installed securely?
Unit may drop, shake or emit noise.
Gas leakage test is taken or not?
Insufficient cooling (heating) capacity
Unit gets proper thermal insulation or not?
There may be condensation and dripping.
Drainage is smooth or not?
There may be condensation and dripping.
Is the voltage in accordance with the rated voltage
specified on the nameplate?
Unit may have malfunction or
components may get damaged.
is the electric wiring and pipe connection installed
correctly?
Unit may have malfunction or
components may get damaged.
Unit is securely grounded or not?
Electrical leakage
Power cord meets the required specification?
Unit may have malfunction or
components may get damaged.
Is the air inlet/outlet blocked?
Insufficient cooling (heating) capacity
Length of refrigerant pipe and the charging
amount of refrigerant are recorded or not?
Binding pieces on compressor feet are removed
or not?
The refrigerant charging amount is not
accurate.
Compressor may get damaged.
23
Check
DC Inverter Multi VRF System
5.2 Test operation and debugging
(1)
After finishing the first installation or replacing the main board of outdoor unit, it is necessary to perform test
operation and debugging. Otherwise, unit won’t be able to work.
(2) Test operation and debugging must be performed by professional technicians or under the guidance of
professional technicians.
5.2.1 Prepare the test operation and debugging
(1) Do not connect power until all installation work is finished.
(2) All control circuits and wires are correctly and securely connected.
(3) Check whether the fixing loops for compressor fts are removed.
(4) All small pieces, especially metal chips, thread ends and forceps holder, must be
removed from the unit.
(5) Check whether unit’s appearance and pipeline system has been damaged during
transportation.
(6) Calculate the quantity of refrigerant that needs to be added according to the pipe length.
Pre-charge the refrigerant. In case that the required charging quantity is not reached
while refrigerant can’t be added, record the quantity of refrigerant that still needs to add
and complement the quantity during test operation. For details of adding refrigerant
during test operation, see below.
(7) After refrigerant is added, make sure valves of outdoor unit are completely open.
(8) For the convenience of troubleshooting during debugging, unit shall be connected to a
PC with applicable debugging software. Make sure unit’s real-time data can be checked
through this computer. The installation and connection of debugging software can be
found in the Service Manual.
(9) 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. If yes,
start test operation. Otherwise, compressor might be damaged.
5.2.2 Test Operation and Debugging
Description of test operation procedures and main board display of ODU
Description of each stage of debugging progress
——
Progress
01_ Set master
unit
02_ Allocate
addresses
Debugging
code
LED1
Code
Display
status
db
Progress code
Status code
LED2
LED3
Code meaning and operation method
Code
Display
status
Code
Display
status
On
01
On
AO
On
System is not debugged.
db
On
01
On
OC
On
Hold main board’s SW7 button for 5s to start
debugging. Main board will display as said in the
left. 2s later, next step starts.
db
On
02
On
Ad
Blink
System is allocating addresses. 10s later, display
as below:
Blink
No master indoor unit. Display will be on for 1min,
during which master IDU can be set manually. If
not, system will set the unit with minimum IP
address as the master IDU.
db
On
02
On
L7
24
DC Inverter Multi VRF System
03_ Confirm
the quantity of
ODU
04_ Confirm
the quantity of
IDU
05_ Detect
ODU’s internal
communication
and capacity
ratio
06_ outdoor
components
07_ Detect
indoor
components
08_ Confirm
preheated
compressor
db
On
02
On
OC
On
Allocation is finished. 2s later, next step starts.
db
On
03
On
01
Blink
System is confirming. 1s later, next step starts.
db
On
03
On
OC
On
System finishes confirmation. 2s later, next step
starts.
db
On
04
On
01~80
Blink
LED3 displays the quantity of indoor unit. Confirm
the number manually. If the number is not
consistent the display one, cut off power of
IDU
and
ODU
and
check
whether
communication wire of IDU is correctly
connected. After the check, connect power and
start debugging from progress 01. If the number
is then correct, press main board’s SW7
button to confirm. Then the display is as below:
db
On
04
On
OC
On
System has confirmed the quantity. 2s later, next
step starts.
db
On
05
On
C2
On
db
On
05
On
OC
On
db
On
05
On
CH
On
db
On
05
On
CL
On
db
On
06
On
error
code
On
db
On
06
On
OC
On
db
On
07
On
Error
code
On
db
On
07
On
OC
On
db
On
08
On
UO
On
db
On
08
On
OC
On
25
Communication between master ODU and driver
has
error.
Check
the
communication
connection of ODU’s main board and drive
board. When the error is eliminated, start next
step. If power is off during troubleshooting, then
restart debugging from progress 01 after power is
on.
Communication of master ODU and driver is
normal. Unit will display as in the left for 2s and
detect the capacity ratio of IDU and ODU. If the
ratio is within range, than next step will start 2s
later. If the ratio is out of range, unit will display as
below:
Rated capacity ratio of IDU is too high. Change
the combination way of IDU and ODU to make
the ratio within range. And restart debugging
from progress 01.
Rated capacity ratio of IDU is too low. Change
the combination way of IDU and ODU to make
the ratio within range. And restart debugging
from progress 01.
Outdoor component’s error. LED3 will display the
related error code. After errors are eliminated,
system will start next step automatically. If power
is off during troubleshooting, then restart
debugging from progress 01 after power is on.
System detects no error on outdoor component.
10s later, next step starts.
System detects error on indoor components.
XXXX means the project code of IDU with error.
3s later, related error code will be showed. For
instance, if no.1 IDU has d6 and d7 errors, then
the LED3 digital tube will show circularly
00,01,d5,d6,07,92,d6,d7 every 2s. After errors
are eliminated, system will start next step
automatically.
If
power
is
off
during
troubleshooting, then restart debugging from
progress 01 after power is on.
No error on components of IDU. 2s later, next step
starts.
Preheat time for compressor is less than 8 hours.
Display will be as in the left until the preheat time
reaches 8 hours. Press main board’s SW7
button to confirm manually that the preheat
time has reached 8 hours. Then start next step.
(Note: Compressor may get damaged if it is
started without 8 hours of preheat time)
Compressor has been preheated for 8 hours. 2s
later, next step starts.
DC Inverter Multi VRF System
09_
Refrigerant
judgments
before startup
10_ Status
judgments of
outdoor valves
before startup
12_ Confirm
debugging
startup
db
On
09
On
U4
On
db
On
09
On
OC
On
db
On
10
On
ON
On
db
On
10
On
U6
On
db
On
10
On
OC
On
db
On
12
On
AP
Blink
db
On
12
On
AE
On
db
On
15
On
AC
On
Debugging for cooling mode. If no malfunction
occurs for 20min when compressor is running,
then system will start progress 17; If malfunction
occurs, unit will display as below:
db
On
15
On
Error
code
On
Malfunction occurs when debugging for cooling
mode. After all malfunctions are eliminated,
system will start next step.
15_ Cooling
debugging
db
On
16
On
AH
On
Debugging for heating mode. If no malfunction
occurs for 20min when compressor is running,
then system will start progress 17; If malfunction
occurs, unit will display as below:
db
On
16
On
Error
code
On
Malfunction occurs when debugging for heating
mode. After all malfunctions are eliminated,
system will start next step.
00
On
AC/AH
On
OFF
On
The entire unit has finished debugging and under
standby-by condition.
16_ Heating
debugging
17_
Debugging
finished
System is lack of refrigerant and display will be as
in the left. Please cut off power of IDU and ODU
and check if there is leakage on pipeline. Solve
the leakage problem and complement refrigerant
into the unit. Then connect power and restart
debugging from progress 01. (Note: Before
re-charging refrigerant, unit must be power off in
case system starts progress 10 automatically.)
Refrigerant is normal and unit will display as in the
left for 2s. Then next step starts.
Valves of ODU are being inspected. Compressor
will start operation for 2min or so and then stop.
The opening and closing status of outdoor valves
are as below:
Outdoor valves are not fully turned on. Press
main board’s SW6 button and display shows “db
09 OC”. Then check if the gas and liquid valves of
ODU are completely open. After confirmation,
press the SW6 button again. Then compressor
will start running for about 2min to inspect the
status of valves.
Valves status is normal. Unit will display as in the
left for 2s and then start next step.
Ready for units to start debugging. Press main
board’s SW7 button to confirm startup of
debugging. 2s later, main board will display as
below:
Startup is confirmed. After displaying for 2s,
system will choose “15_Cooling debugging” or
“16_Heating debugging” according to ambient
temperature. If the project requests to add
refrigerant but it is not complemented before
debugging, then refrigerant can be added in
this process through the L-VALVE.
5.2.3 Appendix: Reference of normal operation parameters
No.
Debug item
1
2
System
parameters
ODU
parameters
Parameter name
Outdoor
temperature
Unit
℃(℉)
Compressor
discharge temp
℃(℉)
26
Reference
——
●When compressor starts, discharge temp in
cool mode is within 70~105℃(158~221℉)
and at least 10℃(50℉) higher than the high
pressure saturation temp;
●As for temp in heat mode, it is within
65~90℃(149~194℉) and at least 10℃(50℉)
higher than the high pressure saturation
DC Inverter Multi VRF System
3
Defrosting temp
℃(℉)
4
System high
pressure
℃(℉)
5
System low
pressure
℃(℉)
6
Opening angle of
thermal EXV
PLS
7
Compressor’s
operating freq
HZ
8
Compressor’s
operating current
A
9
Compressor’s
IPM temp
℃(℉)
10
Fan motor’s
operating freq
HZ
IDU ambient temp
℃(℉)
Indoor heat
exchanger’s inlet
temp
℃(℉)
Opening angle of
indoor EXV
PLS
11
12
13
14
IDU
parameters
27
temp.
●In cool mode, defrosting temp is 4~10℃
(39~50℉) lower than system’s high pressure
value;
●In heat mode, defrosting temp is about 2℃
(36℉) different from system’s low pressure
value.
●In cool mode, the normal high pressure
value is within 20℃~55℃(68~131℉).
According to the change of ambient temp and
system’s operating capacity, the high
pressure value will be 10℃~30℃(50~86℉)
higher than ambient temp. The higher
ambient temp is, the smaller temp difference
is. If ambient temp is 25~35℃(77~95℉) in
cool mode, system’s high pressure value will
be within 44~53℃(111~127℉).
●In heat mode, if ambient temp is above -5℃
(23℉), system’s high pressure value is within
40~52℃(104~126℉). If ambient temp is low
and many IDUs are turned on, the high
pressure will be lower.
●When ambient temp in cool mode is
25~35℃(77~95℉), the low pressure value is
0~8℃(32~46℉).
●When ambient temp in heat mode is above
-5℃(23℉), the low pressure value is -15~8℃
(5~46℉).
●In cool mode, the thermal electronic
expansion valve remains 480PLS.
●In heat mode, the adjustable opening angle
of EXV is 60~480PLS.
GMV-36WL/A-(U)
Changes in 10Hz~80Hz.
GMV-48WL/A-(U)
GMV-60WL/A-(U) Changes in 16Hz~80Hz
When compressor works normally, the current
is no more than 22.6A.
When ambient temp is below 35℃(95℉), IPM
temp is lower than 80℃(176℉) and the
highest temp won’t be above 95℃(203℉).
Changes in 0~49Hz
GMV-36WL/A-(U)
according to system’s
GMV-48WL/A-(U)
pressure.
Changes in 0~40Hz
GMV-60WL/A-(U) according to system’s
pressure.
——
●According to ambient temp, for a same IDU
in cool mode, the inlet temp will be 1℃~7℃
(34~45℉) lower than the outlet temp, and
4~9℃(39~48℉) higher than the low pressure
value.
●For a same IDU in heat mode, the inlet temp
will be 10℃~20℃(50~68℉) lower than the
outlet temp.
●In cool mode, the
GMV-36WL/A-(U)
opening angle of
GMV-48WL/A-(U)
indoor EXV varies
DC Inverter Multi VRF System
15
Communication parameters
Communication
data
—
16
Drainage system
——
—
17
Others
——
—
within 70~480PLS.
●In heat mode, the
opening angle of
indoor EXV varies
within 70~480PLS.
●In cool mode, the
opening angle of
indoor EXV varies
within 70~480PLS.
GMV-60WL/A-(U)
●In heat mode, the
opening angle of
indoor EXV varies
within 40~480PLS.
Number of IDUs detected by software is the
same with the actual number. No
communication error.
Indoor unit can drain water out completely
and smoothly. Condensate pipe has no
backward slope of water; Water of outdoor
unit can be drained completely through
drainage pipe. No water drop from unit base.
Compressor and indoor/outdoor fan motor do
not have strange noise. Unit can operate
normally.
6 Common Malfunctions and Troubleshooting
(1)
If there is abnormal condition (e.g. unpleasant smell), turn unit off and disconnect power immediately. Then
contact AC PRO authorized service center. If unit continues operation despite the abnormal condition, it may get
damaged and lead to electric shock or fire hazard.
(2)
Do not repair the air conditioner by yourself. Improper maintenance may lead electric shock or fire hazard.
Please contact AC PRO authorized service center for maintenance
●Please check the items below before calling for maintenance.
Problems
Causes
Fuse or circuit breaker is cut off.
Unit doesn’t work.
Power failure
Power is not connected.
Remote controller’s power is not enough
Remote controller is out of the control range.
Unit runs but stops
immediately.
Air inlet or air outlet of indoor and outdoor units is
blocked.
Air inlet or air outlet of indoor and outdoor units is
blocked.
Improper temp setting
Fan speed is set too low.
Abnormal cooling or
heating
Wind direction is not correct.
Door or window is open.
Direct sunshine
Too many people in the room.
Too many heat resources in the room.
Filter is blocked and dirty.
28
What to do
Replace fuse or reset the circuit
breaker.
Restart unit when power is
restored.
Connect the power.
Replace new battery.
Control range is within
8m(26feet).
Clear obstructions.
Clear obstructions.
Adjust setting at remote
controller or wired controller
Adjust setting at remote
controller or wired controller
Adjust setting at remote
controller or wired controller
Close the door or window.
Draw curtain or louver.
Reduce heat resources.
Clean the filter
DC Inverter Multi VRF System
NOTICE! If problem cannot be solved after checking the above items, please contact $&352
service center and describe the cases and models.
●Following circumstances are not malfunctions.
Unit doesn’t run.
Mist comes from
the unit.
Noise is emitted.
Unit blows out
dust.
Unit emits odor.
Malfunction
Unit starts up immediately after it is
turned off.
Power is just turned on.
Reason
Overload protection switch makes it run after a
3-min delay.
Standby operation lasts for about 1min.
Under cooling
Indoor air with high humidity is cooled rapidly.
Slight cracking sound is heard when unit
is just turned on.
There is consecutive sound when
cooling.
It is the noise when electronic expansion valve is
initialized.
It is the sound for gas refrigerant flowing in the
unit.
It is the sound when gas refrigerant stops
flowing.
There is sound when unit starts or stops.
There is slight and consecutive sound
when unit is running or after running.
This is the sound of drainage operation.
Cracking sound is heard when unit is
running or after running.
This is the sound caused by the expansion of
panel and other parts of the unit due to
temperature change.
Unit starts up after not operating for a
long time.
Dust in indoor unit is blown out.
Under operation
Unit absorbs the room odor and then blows it
out.
7 Error Indication
Inquiry method of error indication: combine division symbol and content symbol to check the
corresponding error.
For example, division symbol L and content symbol 4 together means over-current protection.
Content
symbol
Division
symbol
L
0
1
2
3
4
5
Malfunction of
IDU (uniform)
Protection of
indoor fan
Auxiliary
heating
protection
Water-full
protection
Over-curren
t protection
Freeze
prevention
protection
Indoor
Indoor PCB
is poor
d
E
Malfunction of
ODU (uniform)
High-pressur
e protection
Main board of
ODU is poor
Malfunction
of
high-pressur
e sensor
Outdoor
F
J
Malfunction
of ambient
temperature
sensor
Discharge
low-temperatur
e protection
Low-pressur
e protection
Malfunction
of
low-pressure
sensor
Over-current
protection of
29
Malfunction
of
entry-tube
temperature
sensor
High
discharge
temperature
protection
of
compressor
Malfunction
of middle
temperature
sensor
Malfunction
of discharge
temperature
sensor of
compressor
1
DC Inverter Multi VRF System
Content
symbol
Division
symbol
0
compressor 1
Malfunction
of outdoor
ambient
temperature
sensor
b
P
malfunction of
driving board
of compressor
(uniform)
U
Preheat time of
compressor is
insufficient
C
Communicatio
n malfunction
between IDU,
ODU and
IDU’s wired
controller
A
Unit waiting for
debugging
Debuggin
g
1
Driving board
of
compressor
operates
abnormally
(uniform)
SE operation
setting of
system
3
Malfunction of
defrosting
temperature
sensor 1
Voltage
protection of
driving board
power of
compressor
(uniform)
Reset
protection of
driving
module of
compressor
Wrong setting
of ODU’s
capacity
code/jumper
cap
Communication
malfunction
between main
control and
inverter
compressor
driver
Inquiry of
compressor
operation
parameters
Status
n
2
Setting of
defrosting
cycle K1
30
5
Malfunction
of liquid
temperature
sensor of
sub-cooler
Malfunction
of gas
temperature
sensor of
sub-cooler
Drive PFC
protection
of
compressor
Over-curren
t protection
of inverter
compressor
Wrong
address for
driving
board of
compressor
Defrosting
Setting of upper
limit of
IDU/ODU
capacity
distribution
ratio
4
Malfunction
of lack of
IDU
Alarm
because
project code
of IDU is
inconsistent
Oil-return
Online test
DC Inverter Multi VRF System
Content
symbol
Division
symbol
Indoor
6
7
L
Mode shock
No main IDU
d
Malfunction
of exit-tube
temperature
sensor
Malfunction
of humidity
sensor
Gas-mixing
protection of
4-way valve
J
b
Malfunction
of inlet temp
sensor of
gas-liquid
separator
P
Drive IPM
module
protection of
compressor
U
Alarm
because
valve is
abnormal
Debuggin
g
Malfunction
of outlet
temp sensor
of gas-liquid
separator
Malfunction
of drive
temperature
sensor of
compressor
8
Power supply
is insufficient
9
1-to-more:
number of IDU
is inconsistent
Malfunction of
jumper cap
High pressure
ratio
protection of
system
A
H
1-to-more:
IDU series
is
inconsisten
t
Web
address of
IDU is
abnormal
Protection
due to
abnormal
pressure
Alarm due to
bad air
quality
(Fresh air
unit)
Malfunction of
heat exchanger
temperature
sensor
Clock of
system is
abnormal
Drive IPM
high
temperature
protection of
compressor
Desynchronizin
g protection of
inverter
compressor
High-voltage
protection of
compressor’
s drive DC
bus bar
Short-circuit
malfunction of
IDU
Malfunction of
pipe-line for
ODU
Rated
capacity is
too high
C
A
Status
n
PCB of wired
controller is
abnormal
Heat pump
function
setting
Malfunctio
n inquiry of
unit
Quiet mode
setting
Vacuum pump
mode
Paramete
r inquiry
of unit
Engineerin
g No.
inquiry of
indoor unit
31
IPLV test
EU AA
level EER
test mode
Heating
Heat pump
unit
Heating only
unit
DC Inverter Multi VRF System
Content
symbol
Division
symbol
C
L
Models for
IDU and
ODU are not
matched
d
Abnormal
setting for
capacity
button
E
Drop
protection of
discharge
temperature
sensor of
compressor
1
Indoor
L
E
Malfunction of
air-outlet
temperature
sensor(Fresh
air unit)
Malfunction of
indoor CO2
sensor (fresh
air unit)
F
J
Malfunction
of DC motor
F
High-pressure
protection
J
P
H
U
Debugging
C
P
Drive current
detection
circuit
malfunction
of
compressor
Drive current
detection
circuit
malfunction
of fan
Setting of
main IDU is
successful
Malfunction
of lack of
main control
unit
A
Cooling
n
Cooling only
unit
Status
Low-voltage
protection of
compressor’s
drive DC bus
bar
Phase-lacking
of inverter
compressor
Low-voltage
protection of
fan’s drive DC
bus bar
Phase-lacking
of inverter fan
Wrong
button-dial
Charging of
refrigerant is
invalid
Failure
startup of
inverter
compressor
AC current
protection of
inverter
compressor
Failure
startup of
inverter fan
AC current
protection of
inverter fan
Malfunction
of multiple
main control
units
Malfunction
of multiple
main wired
controllers
Charging
refrigerant
manually
Fan
Alarm for
cleaning
filter
Malfunction
of multiple
main wired
controllers
Debugging
confirmation
for startup of
unit
Negative sign
code
Fan model
Rated capacity
is too low
Charging
refrigerant
automatically
Drive
charging
circuit
malfunction
of
compressor
Drive
charging
circuit
malfunction
of fan
32
DC Inverter Multi VRF System
Content
symbol
U
Division
symbol
Debugging
C
Status
A
b
Communication
malfunction
between IDU
and the
receiving lamp
plate
Long-distance
emergency
stop
d
n
y
Overflow
distribution
of IP
address
Emergency
stop of
operation
Limit
operation
8 Function Setting of Outdoor Unit
When debugging is finished, press SW3 on the master unit and unit will be ready for function
setting. Default display of outdoor unit’s main board is as below:
LED1
LED2
LED3
Function code
Display
Current progress
Display
Current status
Display
A7
Blink
00
Blink
00
Blink
Then press SW1 button(▲) and SW2 button(▼) on the master unit to switch function codes of
LED1 to select relevant functions.
Function setting includes: outdoor silent mode setting (A7), heating and cooling function
setting (A6), compulsory defrosting (n3)
After selecting relevant functions, press SW7 to confirm and start setting this function. Main
board of outdoor unit will display as below:
LED1
LED2
LED3
Function code
Display
Current progress
Display
Current status
Display
A7
On
00
Blink
oC
Blink
A6
On
CH
Blink
CH
Blink
n3
On
35
Blink
oC
Blink
8.1 ODU Quiet Function
This function is suitable for projects that have strict requirements for noise. It includes two
modes: smart night silent mode, compulsory silent mode.
When unit enters function setting, main board of outdoor unit will display as below:
LED1
LED2
LED3
Function code
Display
Current progress
Display
Current status
Display
A7
On
00
Blink
oC
Blink
Press SW1 button (▲) and SW2 button (▼) to select the following silent modes.
LED1
LED2
LED3
Function code
Silent mode
Display
Current status
Display
A7
00~12
Blink
oC
Blink
When applicable mode is selected, press SW7 to confirm. Main board of outdoor unit will
display as below:
33
DC Inverter Multi VRF System
LED1
LED2
LED3
Function code
Silent mode
Display
Current status
Display
A7
00~12
On
oC
On
Notice: code 00 of LED2 refers to normal mode. Codes 01~09 refer to smart night silent mode.
Codes 10~12 refer to compulsory silent mode. When setting is finished, master unit will memorize
it so that it can’t be cancelled even when power is on or off.
Then press SW6 on the master unit to return to the previous step. (If this button is pressed
when function is being set, system will return to the previous step. If SW6 is pressed when setting
is finished, system will resume displaying the current operation status.)
If then no motion is taken to the master unit for 5min, unit will exit and resume displaying the
current status.
8.2 Cool & Heat Function
This function can set operation modes and prevent mode collision that is caused by setting
different modes for different indoor units. It is especially suitable for hotels and other small
business areas. There are 3 levels for this setting:
Level A—Mode Lock Control
Upon entering this function setting, main board of outdoor unit will display as below:
LED1
LED2
LED3
Function code
Current progress
Display
Current status
Display
A6
nC
Blink
nC
Blink
Press SW1 button (▲) and SW2 button (▼) to select the following functions:
LED1
LED2
LED3
Function code
Display
Current progress/mode
Display
Current status
Display
A6
On
nC
Blink
nC
Blink
A6
On
nH
Blink
nH
Blink
A6
On
nA
Blink
nA
Blink
A6
On
nF
Blink
nF
Blink
When applicable mode is selected, press SW7 to confirm. The related display is as below:
LED1
LED2
LED3
Function code
Display
Current progress/mode
Display
Current status
Display
A6
On
nC
On
nC
On
A6
On
nH
On
nH
On
A6
On
nA
On
nA
On
A6
On
nF
On
nF
On
This setting will be memorized by master unit and can’t be cancelled even when power is on
or off.
Then press SW6 on the master unit to return to the previous step.
If then no motion is taken to the master unit for 5min, unit will exit and resume displaying the
current status.
(If this button is pressed when function is being set, system will return to the previous step. If
SW6 is pressed when setting is finished, system will resume displaying the current operation
status.)
34
DC Inverter Multi VRF System
Default setting is “nA” cooling and heating type.
Level B—IDU Mode Auto Control
When Level A is disabled or outdoor unit is set to be cooling and heating type, the operation
mode within one system depends on the master-salve setting of indoor units.
8.3 Forced Defrosting
This function can only be set when outdoor compressor is running.
Upon entering this function, main board of outdoor unit will display as below:
LED1
LED2
LED3
Function code
Display
Current progress/mode
Display
Current status
Display
n3
On
00
Blink
00
Blink
Press SW7 to confirm. When system enters this function, main board of outdoor unit will
display as below:
LED1
LED2
LED3
Function code
Display
Current progress/mode
Display
Current status
Display
n3
On
00
On
00
On
Then unit will be in compulsory defrosting mode. Once unit is under compulsory defrosting,
this mode can only be stopped when requirements for exit are met.
8.4 Restore Factory Defaults
(1) If you want to restore factory defaults, hold SW8 button on the main board of ODU for more
than 10s, then all LEDs will blink for 3s. Main board will cancel all setting, including the IP
addresses and project codes of IDU and ODU. The mark for finished debugging is “0”.
(2) If you want to restore factory defaults and don’t need project debugging, then hold SW3 and
SW8 on the main board of ODU for more than 10s, then all LEDs will blink for 5s. All settings
are cleared out, including the IP addresses and project codes of IDU and ODU. The mark for
finished debugging remains the same.
(3) When you only want to restore the default functions, hold SW5 and SW8 button for more than
10s, then all LED will blink for 7s. All function settings are cleared out, but IDU and ODU’s
project codes and the mark for finished debugging remain the same.
8.5 Static Pressure Function
If ODU’s installation area is not convenient for releasing air and users do not have strict
requirements for ODU noise, this function can be set to satisfy the heat exchange of ODU.
Before power on, set codes of SA6 of main board. The relevant static pressure is:
Code setting SA6
DIP1
DIP2
Static pressure
(Pa)
0
0
0
1
0
20
Note: code of number side is “1”; default code of SA6 is “00”.
35
DC Inverter Multi VRF System
9 Maintenance and Care
Regular check, maintenance and care can extend unit’s service life. Please have specialized
person in charge of the management of air conditioners.
9.1 Outdoor Heat Exchanger
Outdoor heat exchanger shall be cleaned regularly, which is at least once every two months.
You can use a dust catcher with nylon brush to clean away the dust on the heat exchanger. If
compressed air source is available, it also can be used to clean the heat exchanger. Do not clean
it with water.
9.2 Drain Pipe
Please check regularly whether drain pipe is blocked or not. Make sure condensate can be
drained out smoothly.
9.3 Notice before Seasonal Use
(1) Check whether air inlets and air outlets of indoor and outdoor units are blocked;
(2) Check whether ground connection is reliable or not;
(3) Check whether batteries in the remote controller are replaced or not;
(4) Check whether air filter is properly installed;
(5) If unit starts up after not operating for a long time, it should be power on 8 hours before
operation starts so as to preheat the outdoor compressor;
(6) Check whether outdoor unit is securely installed. If there is any problem, please contact
AC PRO authorized service center.
9.4 Maintenance after Seasonal Use
(1) Disconnect power of the entire system;
(2) Clean the air filter and outer case of indoor and outdoor units;
(3) Clean away the dust and obstacles on indoor and outdoor units;
(4) If outdoor unit has rust, please apply some paint to it so as to prevent the rust from
growing.
9.5 Parts Replacement
Parts and components can be obtained from nearby AC PRO office or AC PRO distributor.
When you are conducting air tightness test and leakage test, do not mix oxygen, C2H2 or other dangerous gas into
the refrigerant circuit. Otherwise, it may lead to danger. Use nitrogen or refrigerant to conduct the tests.
36
DC Inverter Multi VRF System
10 After-sales Service
If there’s quality defect or other problems in the product, please contact AC PRO local
after-sales service department for help.
Warranty must be based on the following conditions:
(1) Product’s initial startup must be performed by professional technicians from AC PRO service
center or persons assigned by AC PRO.
(2) Only AC PRO spare parts are used,
(3) All instructions of unit operation and maintenance in this manual must be strictly followed
according to set period and set frequency.
(4) Any breach of the above conditions will disable the warranty.
37
0DWHULDO6XSSO\,QFGED$&3UR
Add: 11700 Industry Ave., Fontana, CA 92337, USA
Tel: 1-951-360-0630
E -mail: www.acpro.com
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