NORTEK GLOBAL HVAC, LLC DC Inverter Multi VRF System

NORTEK GLOBAL HVAC, LLC  DC Inverter Multi VRF System
NORTEK GLOBAL HVAC, LLC
DC Inverter Multi VRF System
Owner's Manual
Heat Pump
Applicable Models:
V5BV-36WMAK
V5BV-48WMAK
V5BV-60WMAK
z
z
Please read this owner’s manual carefully before operation and retain it for future reference
Specifications & illustrations subject to change without notice or incurring obligations
DC Inverter Multi VRF System
Preface
The DC Inverter Multi VRF System, with the most advanced technology in the world, uses eco-friendly
refrigerant R410A. 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.
(4) Make sure that this manual is kept for future refernce.
(5) In case of malfunction, please check the following items and contact a qualified technician as soon
as possible.
1) Nameplate (model, cooling capacity, product code, manufacture 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 shipment. To avoid damage or
operation failure which may be caused by improper service, please contact a qualified service
technician.
(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 standby status, the unit will use a little power when not running for normal communication and
preheating of refrigerant. If the system won’t be used for an extended period, turn off the power of
the complete unit. However, the system will require preheating the next time it is used.
Contents
1 Safety Precautions………………………………………………………………………………………………………………………………………………… 1
2 Product Introduction………………………………………………………………………………………………………………………………………………..3
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 .................................................................................................................................... 5
3.1 Standard Parts.................................................................................................................................................... 5
3.2 Installation Site ................................................................................................................................................... 6
3.3 Piping Work Requirements ............................................................................................................................... 7
4 Installation Instruction…………………………………………………………………………………………………………………………………………….8
4.1 Dimension of Outdoor Unit and Mounting Hole………………………………………………………………………………………..8
4.2 Connection Pipe ................................................................................................................................................. 9
4.3 Installation of Connection Pipe ...................................................................................................................... 13
4.4 Disassembly of Compressor Feet ................................................................................................................. 18
4.5 Vacuum Pumping, Refrigerant Adding…………………………………………………………………………………………………….19
4.6 Electric Wiring .................................................................................................................................................. 21
5 Check Items after Installation and Test Operation ................................................................................................. 25
5.1 Check Items after Installation ......................................................................................................................... 25
5.2 Test operation and debugging………………………………………………………………………………………………………………….25
6 Common Malfunctions and Troubleshooting .......................................................................................................... 30
7 Error Indication……………………………………………………………………………………………………………………………………………………..31
8 Function Setting of Outdoor Unit .............................................................................................................................. 36
8.1 ODU Quiet Function ........................................................................................................................................ 36
8.2 Cool & Heat Function ...................................................................................................................................... 37
8.3 Forced Defrosting ............................................................................................................................................ 37
8.4 Restore Factory Defaults ................................................................................................................................ 38
8.5 Static Pressure Function ................................................................................................................................. 38
9 Maintenance and Care ............................................................................................................................................... 39
9.1 Outdoor Heat Exchanger ................................................................................................................................ 39
9.2 Drain Pipe ......................................................................................................................................................... 39
9.3 Notice before Seasonal Use .......................................................................................................................... 39
9.4 Maintenance after Seasonal Use .................................................................................................................. 39
9.5 Parts Replacement .......................................................................................................................................... 39
10 After-sales Service .................................................................................................................................................... 40
DC Inverter Multi VRF System
1 Safety Precautions
WARNING NOTICE: Failure to comply with warning notice could result in property
damage, serious personal injury or death...
CAUTION NOTICE: Failure to comply with caution notice could result in property damage
or personal injury.
NOTICE: Failure to comply with notice could result in property damage..
(1)
Instructions for installation and use of this product are provided by the manufacturer.
(2)
Installation must be performed by qualified personnel only.
(3)
Please follow installation instructions as outlined in this manual.
(4)
Use appropriate pipe connection material and appropriate electrical cord as outlined in this manual.
(5)
Before installation, check the power cord if it complies with the power supply requirement on the nameplate.
Make sure the power supply is safe.
(6)
This air conditioner must be properly grounded through the receptacle to avoid electric shock. The ground
wire shouldn’t be connected to gas pipe, water pipe, lightning rod 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 with gas pipe and liquid pipe valve open.
This may cause abnormal pressure in the refrigeration cycle that leads compressor damage or personal
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 compressor damage or personal
injury.
(11) When installing 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 compressor damage or personal injury.
(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,.
(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 with an appropriate size cord.
(16) When installing, approved 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
approved 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 connected.
Otherwise, the wired controller may be damaged.
(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 insert fingers or objects into air outlet or return air grille.
(23) If you use gas heater or petroleum heater in the same room, please open the door or window to maintain
good air ventilation.
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DC Inverter Multi VRF System
(24) Never start or stop the air conditioner by plugging or unplugging the power cord.
(25) Do not turn off the air conditioner until it runs for at least 5 minutes. Otherwise, the compressor oil return
system will malfunction.
(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 to damp or corrosive environment.
(31) Connect power 8 hours before startup operation. Do not disconnect power when you want to stop the unit for
a short period of time, e.g. in one night. (This is may cause damage to the compressor.)
(32) Volatile liquid like paint thinner or gasoline will damage the appearance of air conditioner. (Please use soft dry
cloth or damp 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 5ć(9̧).
(34) If abnormal condition occurs (e.g. unpleasant smell), please turn off the unit at once and disconnect power
supply.If the air conditioner continues to operate abnormally, it may be damaged and cause electric shock or
fire hazard.). Contact a qualified HVAC technician.
(35) Do not repair the air conditioner by yourself. Improper repair will cause electric shock or fire hazard. Contact a
qualified HVAC technician for service.
(36) Manufacturer 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.
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DC Inverter Multi VRF System
2 Product Introduction
This equipment uses inverter compressor technology. This allows the compressor to
modulate at a range of 15%~100%...
2.1 Names of Main Parts
V5BV-36WMAK
V5BV-48WMAK
V5BV-60WMAK
3
DC Inverter Multi VRF System
Fig.1
No.
ķ
ĸ
Name
Motor
Fan blade
Ĺ
Electric box
assembly
ĺ
Gas pipe valve
Ļ
Liquid pipe
valve
2.2 Combinations of Indoor and Outdoor Units
See below the number of indoor units that can be connected to the outdoor unit.
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
V5BV-36WMAK
2
7
V5BV-48WMAK
2
8
V5BV-60WMAK
2
13
Outdoor DC Inverter Multi VRF System units can be connected to various indoor units.
As indoor units start or stop, outdoor unit will adjust as per required capacity. When all
indoor units stop, outdoor unit will be shut off.
2.3 Operating Range
Cooling
Heating
Outdoor temperature: -5ć̚48ć(23̧~118̧)
Outdoor temperature: -20ć̚27ć(-4̧~81̧)
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DC Inverter Multi VRF System
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
1
User Manual
1
2
Wiring (match with
resistance)
1
Must be connected to the
last IDU of communication
connection
3
Corrugated pipe
1
V5BV-36WMAK
V5BV-48WMAK
Liquid side
connection pipe
1
This part is included in the
following models:
V5BV-60WMAK
Gas side
connection pipe
1
This part is included in the
following models:
V5BV-60WMAK
6
Appearance
Qty
Drainage hole cap
3
7
Drainage joint
1
5
Remark
DC Inverter Multi VRF System
3.2 Installation Site
(1)
Check the support structure to verify that it has sufficient load-carrying capacity to support the weight of the
unit, and it can be securely mounted.
(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 should be kept away from unit.
(5) Select a location which is out of children’s reach. Keep the unit away from children.
(6) Unit should be installed so that air flow pattern is free of obstruction.
(7) Be sure to leave sufficient space around the unit for service and maintenance..
(8) Install the unit level. It should not tilt by more than 5°.
(9) The unit should be mounted securely to withstand high wind potential for your location.
(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 dirt or rain as much as possible.
(3)
Install ODU where it is convenient to connect IDU.
(4)
ODU and IDU should be installed 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. Do not place animals and plants in the
path of the warm air.
Check the support structure to verify that it has sufficient load-carrying capacity to support the weight of the
unit. Mount the unit securely to reduce vibration noise
(6)
If the ODU is totally surrounded by walls, please refer to the following figures for clearances:
Fig.2
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DC Inverter Multi VRF System
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 for reference only. 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
V5BV-36WMAK
V5BV-48WMAK
900
(35-3/8)
340
(13-3/8)
1345
(53)
572
(22-1/2)
378
(15)
V5BV-60WMAK
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 used 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(1-1/2 feet).
Fig.5 Allowable Length and Height Difference of Connection Pipe
Piping parameters of V5BV-36WMAKǃV5BV-48WMAKǃV5BV-60WMAK
Allowable value
feet
300
1000
120
120
400
150
150
500
40
130
L2+L3+d
50
50
165
——
40
40
130
——
15
50
——
Total length of fitting pipe
Length from farthest fitting pipe
st
From the 1 branch to the farthest indoor pipe
Height difference between ODU
and IDU
Fitting pipe
m
Height difference between IDUs
10
L1+L2+L3+a+b+c+d
L1+L2+L3+d
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)
V5BV-36WMAK
φ15.9
(φ5/8)
φ9.52
(φ3/8)
V5BV-48WMAK
φ15.9
(φ5/8)
φ9.52
(φ3/8)
V5BV-60WMAK
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
68200İCİ102400
FQ01B
102400˘Cİ238800
FQ02
238800˘Cİ460600
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)
Observe the following during pipe connection: Connection pipe should be as short as possible. Height
difference between indoor and outdoor units should be as short as possible. Keep the number of bends as
few as possible. Radius of curvature should be as large as possible.
(2)
Weld the connection pipe between indoor and outdoor units. 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 it will become brittle and break. 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 pipe to avoid misshaping.
(2) Keep the pipe downward in case cutting scraps get into the pipe. Clear away the burrs
after cutting.
(3) Remove the flared nut from the valve on both the indoor and outdoor units. 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 no crack.
Fig. 10
4.3.2 Pipe Bending
(1) Extend the pipe by hand. Be careful not to crimp it.
(2) Do not bend the pipe more than 90°.
(3) If pipe is repeatedly bent or stretched, it will weaken making it more likely to break. Do
not bend or stretch the bend for over 3 times.
(4) For best results, cut insulation before bending, as shown in Fig.12. Bend pipe as needed and secure
insulation with 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 alignment of
the center will prevent flared nut from being securely fastened. Thread of nut will get damaged if
not aligned correctly.)
(3) Use torque wrench to tighten the flared nut until the wrench gives out a click sound.
(Hold the handle of wrench 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 secure the sponge tightly with plastic
tape.
(2)
Connection pipe should not be supported by 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 on the pipe or pipe joints 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.-lb.)
9.5mm(3/8 inch)
35-40N·m(26-29ft.-lb.)
12.7mm(1/2 inch)
45-50N·m(33-37ft.-lb.)
16mm(5/8 inch)
60-65N·m(44-48ft.-lb.)
4.3.4 Outdoor Pipe Connection
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.
Fig. 15
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DC Inverter Multi VRF System
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 dimensions, which facilitates
matching to various copper pipes. Use pipe cutter to cut in the middle of the pipe section and
remove burrs. See Fig. 17.
(3) Y-type branch must be installed vertically or horizontally.
Fig. 19
Branch shall be isolated by insulating material that can bear 120ć(248̧)or even higher temperature. The foam
attached to the branch is not considered 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.
2) Joints of indoor and outdoor unit should be wrapped with insulating material leaving 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, half of the width of the tape should cover the previous layer of
tape. Don’t wrap the tape too tight, or insulation effectiveness will be comprised.
4) After wrapping the pipe, apply sealing material around the hole on the wall.
(1)
Thermal insulating material shall be able withstand the pipe temperature. For heat pump unit, liquid pipe
should withstand 70ć(158̧) or above and gas pipe should withstand 120ć(248̧) or above. For cooling
only unit, both liquid pipe and gas pipe should withstand 70ć(158̧) or above.
(2)
Thermal insulating material of branches should be the same as that of the pipeline. The attached foam of
branches alone cannot be substituted for 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
feet).
Protection against accidental damage should be made for outdoor pipeline. When pipeline exceeds 1m(3
feet), 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. Then fasten the
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DC Inverter Multi VRF System
binding nuts again and replace soundproofing cotton. If unit runs with metal pieces fitting on,
compressor will vibrate and unit’s operating life will be shortened.
4.5 Vacuum Pumping, Adding Refrigerant
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 Adding Refrigerant
(1) Refrigerant quantity of outdoor unit before delivery:
Model
V5BV-36WMAK
V5BV-48WMAK
V5BV-60WMAK
Refrigerant Qty (kg/lb)
5.0
(11)
5.0
(11)
6.5
(14)
(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 determined on site. Therefore the amount of additional refrigerant
shall be determined according to the dimension and length of field-installed liquid pipe.
(3) Record the amount of additional refrigerant for future service reference.
(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
meter(39-3/8inch)
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DC Inverter Multi VRF System
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 feet) doesn’t need added 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, 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 ķ
IDU ĸ
IDU Ĺ
IDU ĺ
Model
Duct type
BDDL-5.6(18)SAK
Duct type
BDDL-3.6(12)SAK
Duct type
BDDL-2.8(09)SAK
Duct type
BDDL-2.8(09)SAK
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
3/8Inch: A+B+C+a = 32-1/2 + 16-1/2 + 16-1/2 + 10 = 75-1/2 feet
φ6.35: D+b+c+d=5+3+2+1=11m
20
DC Inverter Multi VRF System
¼ inch: D+b+c+d = 16-1/2 + 10 + 6-1/2 + 3 = 36 feet
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 and national
codes, regulations and this user manual.
(2)
Use dedicated power supply and make sure that it is consistent with system’s rated voltage.
(3)
Do not pull the power cord.
(4)
Caliber of the power cord must be appropriate for voltage. A damaged power cord or connection wire must be
replaced by approved electrical cords.
(5)
Connect the unit to dedicated grounding device and make sure it is secure. Install an air switch with suitable
capacity. Air switch should include magnet buckle and heating buckle function, it can protect the circuit-short
and overload. (Caution: please do not use the fuse only to protect the circuit).
(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:
ķWater pipe; ĸGas pipe; ĹDrain pipe; ĺOther places that are deemed as not secure by professional
electrician.
(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 (1 inch).
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 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. 26)
21
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 turned off.
(2)
Match the terminal block numbers and connection cord colors with those of the indoor unit.
Improper wiring may cause damage to the electric parts.
(3)
Connect the connection cords firmly to the terminal block. Improper 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 short may occur.)
(5)
Always connect the ground wire.
22
DC Inverter Multi VRF System
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 and communication wire of outdoor unit.
Fig.27
There are two wiring diagrams for communication wires of indoor/outdoor units and remote
monitor:
23
DC Inverter Multi VRF System
1.Real line method;
2.Broken line method. Please select it based on the installation requirements.
There are two wiring diagrams for power cord:
1.Real line method;
2. Broken line method. Please select it based on the installation requirements.
(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)
V5BV-36WMAK
208/230V~ 60Hz
50
50
32
V5BV-48WMAK
208/230V~ 60Hz
60
60
37
V5BV-60WMAK
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 40ć(104̧) and
multi-core copper cable (working temperature is 90ć(194̧), 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 40ć(104̧). If working condition changes, please adjust the specification according to national
standard.
24
DC Inverter Multi VRF System
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 fall, 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 malfunction or components may
get damaged.
Is the electric wiring and pipe connection installed
correctly?
Unit may malfunction or components may
get damaged.
Unit is securely grounded or not?
Electrical short
Power cord meets the required specification?
Unit may 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?
Metal pieces on compressor feet are removed or
not?
The refrigerant charging amount is not
accurate.
Check
Compressor may get damaged.
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 will not work.
Test operation and debugging must be performed by 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 metal pieces on compressor feet are removed.
(4) All small debris and tools, 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.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
25
DC Inverter Multi VRF System
PC with applicable debugging software. Make sure unit’s real-time data can be checked
through this computer. Information on the debugging software can be found in the
Service Manual.
(9) Before test operation, make sure unit is powered 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. If compressor hasn’t been preheated, it might be damaged by
testing.
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
03_ Confirm
the quantity of
ODU
04_ Confirm
the quantity of
IDU
05_ Detect
ODU’s internal
communication
and capacity
ratio
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 shown to
the left. 2s later, next step starts.
db
On
02
On
Ad
Blink
System is assigning addresses. 10s later, display
as below:
No master indoor unit. Display will be on for 1min,
during which master IDU can be set manually. If
not, system will automatically set the unit with
minimum IP address as the master IDU.
db
On
02
On
L7
Blink
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 units.
Confirm the number manually. If the number is not
correct, cut off power of IDU and ODU and check
whether communication wire of IDU is correctly
connected. After the check, reconnect power and
start debugging from level 01. If the number is
then correct, press main board’s SW7 button to
confirm. Then the display will move on to then
next step:
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
26
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 step 01 after power is on.
Communication of master ODU and driver is
normal. Unit will display as shown to 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 of IDU and ODU to make the ratio
DC Inverter Multi VRF System
within range. And restart debugging from step 01.
06_ outdoor
components
07_ Detect
indoor
components
08_ Confirm
preheated
compressor
09_
Refrigerant
judgments
before startup
10_ Status
judgments of
outdoor valves
before startup
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
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
12_ Confirm
debugging
startup
27
Rated capacity ratio of IDU is too low. Change the
combination of IDU and ODU to make the ratio
within range. And restart debugging from step 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 step 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 shown. For
instance, if no.1 IDU has d6 and d7 errors, then
the LED3 digital tube will alternate between
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 step
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 shown on 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.
System lack of refrigerant and display will be as
shown on the left. Please cut off power of IDU
and ODU and check if there is leakage on
pipeline. Solve the leakage problem and add
refrigerant into the unit. Then connect power and
restart debugging from step 01. (Note: Before
re-charging refrigerant, unit must be power off to
avoid starting step 10 automatically.)
Refrigerant is normal and unit will display as
shown on 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 shown below:
Ready for units to start debugging. Press main
board’s SW7 button to confirm startup of
debugging. 2s later, main board will display as
shown below:
Valves status is normal. Unit will display as shown
on 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
shown 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 completely charged
before debugging, refrigerant can be added in
this process through the L-VALVE.
DC Inverter Multi VRF System
db
On
15
On
AC
On
Debugging for cooling mode. If no malfunction
occurs for 20min when compressor is running,
then system will start step 17; If malfunction
occurs, unit will display as shown 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 step 17; If malfunction
occurs, unit will display as shown 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
5.2.3 Appendix: Reference of normal operation parameters
No.
Debug item
1
Parameter name
Outdoor
temperature
Unit
ć(̧)
2
Compressor
discharge temp
ć(̧)
3
Defrosting temp
ć(̧)
4
System high
pressure
ć(̧)
5
System low
pressure
ć(̧)
System
parameters
ODU
parameters
28
Reference
——
●When compressor starts, discharge temp
in cool mode is within 70~105ć(158~221
̧) and at least 10ć(18̧) higher than the
high pressure saturation temp;
●As for temp in heat mode, it is within
65~90ć(149~194̧) and at least 10ć(18
̧) higher than the high pressure saturation
temp.
●In cool mode, defrosting temp is 4~10ć
(7~18̧) lower than system’s high pressure
value;
●In heat mode, defrosting temp is about 2ć
(4̧) different from system’s low pressure
value.
●In cool mode, the normal high pressure
value is within 20ć~55ć(68~131̧).
According to the change of ambient temp
and system’s operating capacity, the high
pressure value will be 10ć~30ć(18~54̧)
higher than ambient temp. The higher
ambient temp is, the smaller temp
difference is. If ambient temp is 25~35ć
(77~95̧) in cool mode, system’s high
pressure value will be within 44~53ć
(79~95̧).
●In heat mode, if ambient temp is above
-5ć(23̧), system’s high pressure value is
within 40~52ć(72~93̧). If ambient temp
is low and many IDUs are turned on, the
high pressure will be lower.
●When ambient temp in cool mode is
25~35ć(77~95̧), the low pressure value
is 0~8ć(32~46̧).
●When ambient temp in heat mode is
above -5ć(23̧), the low pressure value is
-15~8ć(5~46̧).
DC Inverter Multi VRF System
Opening angle of
thermal EXV
6
Compressor’s
operating freq
Compressor’s
operating current
7
8
Compressor’s IPM
temp
9
Fan motor’s
operating freq
IDU ambient temp
10
11
12
13
IDU
parameters
14
PLS
HZ
A
ć(̧)
HZ
ć(̧)
Indoor heat
exchanger’s inlet
temp
ć(̧)
Opening angle of
indoor EXV
PLS
15
Communication parameters
Communication
data
—
16
Drainage system
——
—
17
Others
——
—
29
●In cool mode, the thermal electronic
expansion valve remains 480PLS.
●In heat mode, the adjustable opening
angle of EXV is 60~480PLS.
Changes from 10Hz~80Hz.
When compressor works normally, the
current is no more than 18.4A.
When ambient temp is below 35ć(95̧),
IPM temp is lower than 80ć(176̧) and the
highest temp won’t be above 95ć(203̧).
Changes from 0~49Hz according to
system’s pressure.
——
●According to ambient temp, for a same
IDU in cool mode, the inlet temp will be 1ć
~7ć(2~13̧) lower than the outlet temp,
and 4~9ć(7~16̧) higher than the low
pressure value.
●For a same IDU in heat mode, the inlet
temp will be 10ć~20ć(18~36̧) lower
than the outlet temp.
●In cool mode, the opening angle of indoor
EXV varies within 70~480PLS.
●In heat mode, the opening angle of indoor
EXV varies within 70~480PLS.
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 dripping from unit
base.
Compressor and indoor/outdoor fan motor
operate normally. Unit can operate
normally.
DC Inverter Multi VRF System
6 Common Malfunctions and Troubleshooting
(1)
If there is a noticeable malfunction (e.g. unpleasant smell, or unusual noise), turn unit off and disconnect
power immediately. Then contact qualified service center. If unit continues operation, 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 check the items below before calling for maintenance.
Problems
Causes
Fuse or circuit breaker is cut off.
Power failure
Unit doesn’t work.
Power is not connected.
Remote controller’s battery is dead
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.
Unit not cooling or heating
properly
Air flow direction is not correct.
Door or window is open.
Direct sunshine
Too many people in the room.
Too many heat sources in the room.
Filter is blocked or dirty.
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 sources.
Clean the filter
NOTICE! If problem cannot be solved after checking the above items, please contact a
qualified service center and describe the cases and models.
●Following circumstances are not malfunctions.
Unit doesn’t run.
Mist comes from
the unit.
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.
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 repeating sound when cooling.
Noise is emitted.
Unit blows out
dust.
Unit emits odor.
There is sound when unit starts or stops.
There is slight and repeating 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.
30
DC Inverter Multi VRF System
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 (L4) 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
F
Outdoor
Malfunction of
ODU (uniform)
High-pressur
e protection
Main board of
ODU is poor
Malfunction
of
high-pressur
e sensor
Over-current
protection of
compressor 1
Malfunction
of outdoor
ambient
temperature
sensor
J
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
Debuggin
g
Malfunction
of ambient
temperature
sensor
Driving board
of
compressor
operates
abnormally
(uniform)
Discharge
low-temperatur
e protection
Low-pressur
e protection
Malfunction
of
entry-tube
temperature
sensor
High
discharge
temperature
protection
of
compressor
Malfunction
of discharge
temperature
sensor of
compressor
1
Malfunction
of
low-pressure
sensor
Malfunction of
defrosting
temperature
sensor 1
Voltage
protection of
driving board
power of
compressor
(uniform)
Wrong setting
of ODU’s
capacity
code/jumper
cap
Communication
malfunction
between main
control and
inverter
compressor
driver
31
Reset
protection of
driving
module of
compressor
Malfunction
of middle
temperature
sensor
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
Malfunction
of lack of
IDU
Alarm
because
project code
of IDU is
inconsistent
DC Inverter Multi VRF System
Content
symbol
Division
symbol
A
0
1
Unit waiting for
debugging
Inquiry of
compressor
operation
parameters
Status
n
SE operation
setting of
system
Setting of
defrosting
cycle K1
2
Setting of upper
limit of
IDU/ODU
capacity
distribution
ratio
32
3
4
5
Defrosting
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
33
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
34
DC Inverter Multi VRF System
Content
symbol
Division
symbol
Debugging
C
Status
A
U
Communication
malfunction
between IDU
and the
receiving lamp
plate
Long-distance
emergency
stop
b
d
Overflow
distribution
of IP
address
Emergency
stop of
operation
35
Limit
operation
n
y
DC Inverter Multi VRF System
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 shown 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 shown 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 applications 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 shown 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:
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.)
36
DC Inverter Multi VRF System
If selection is made 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 conflict that is caused by different
settings 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 shown 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 shown
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 no selection is made 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.)
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 shown below:
LED1
LED2
LED3
Function code
Display
Current progress/mode
Display
Current status
Display
n3
On
00
Blink
00
Blink
37
DC Inverter Multi VRF System
Press SW7 to confirm. When system enters this function, main board of outdoor unit will
display as shown 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 display 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 display
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 display 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”.
38
DC Inverter Multi VRF System
9 Maintenance and Care
Regular check, maintenance and care can extend unit’s service life. Please have a dedicated
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. 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;
(3) Check whether batteries in the remote controller need replacing;
(4) Check whether air filter is properly installed;
(5) If unit has had power off for a long period of 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
an authorized service technician.
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 debris 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 authorized distributor.
When you are conducting air tightness test and leakage test, do not mix oxygen, C2H2 or other dangerous gas into
the refrigerant circuit. Use nitrogen or refrigerant to conduct the tests.
39
DC Inverter Multi VRF System
10 After-sales Service
If there’s quality defect or other problems in the product, please contact your authorized
distributor for help.
Warranty must be based on the following conditions:
(1) Product’s initial startup must be performed by professional technicians.
(2) Only approved 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 void the warranty.
40
Specifications & illustrations subject to change without notice
or incurring obligations.
O’Fallon, MO (12/15) © Nortek Global HVAC, LLC 2015.
All Rights Reserved. 546E-1215
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