Cooper & Hunter CHV-5S120NK User manual

Applicable Models:
CHV-5S120NK
CHV-5S140NK
CHV-5S160NK
DC Inverter Multi
VRF System User Manual
Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference.
C&H reserves the right to interpret this manual which will be subject to any change due
to product improvement without further notice.
Air Conditioners
Owner's Manual

Preface
C&H 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: EN 14511-2011.
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.

Contents
1 Safety Precautions ..................................................................................1
2 Product Introduction ................................................................................3
2.1 Names of Main Parts ................................................................................ 3
2.2 Combinations of Indoor and Outdoor Units .............................................. 3
2.3 Operating Range ...................................................................................... 3
3 Preparation before Installation.................................................................4
3.1 Standard Parts.......................................................................................... 4
3.2 Installation Site ......................................................................................... 4
3.3 Piping Work Requirements ..................................................................... 5
4 Installation Instruction.............................................................................6
4.1 Dimension of Outdoor Unit and Mounting Hole ........................................ 6
4.2 Connection Pipe ....................................................................................... 7
4.3 Oil Loop ...................................................................................................11
4.4 Installation of the Connection Pipe ..........................................................11
4.5 Disassembly of Compressor Feet........................................................... 15
4.6 Vacuum Pumping, Refrigerant Adding .................................................... 15
4.7 Electric Wiring......................................................................................... 17
5 Check Items after Installation and Test Operation.................................18
5.1 Check Items after Installation ................................................................. 18
5.2 Test operation and debugging................................................................. 18
6 Common Malfunctions and Troubleshooting .........................................22
7 Error Indication ......................................................................................23
8 Function Setting of Outdoor Unit ...........................................................25
8.1 ODU Quiet Function............................................................................... 25
8.2 Cool & Heat Function............................................................................. 26
8.3 Forced Defrosting .................................................................................. 27
8.4 Restore Factory Defaults ....................................................................... 27
8.5 Static Pressure Function........................................................................ 27
9 Maintenance and Care .........................................................................28
9.1 Outdoor Heat Exchanger ........................................................................ 28
9.2 Drain Pipe ............................................................................................... 28
9.3 Notice before Seasonal Use ................................................................... 28
9.4 Maintenance after Seasonal Use............................................................ 28
9.5 Parts Replacement ................................................................................ 28
10 After-sales Service..............................................................................28

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

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If anything abnormal happens
(such as burning smell), please
power off the unit and cut off
the main power supply, and
then immerdiately contact C&H
appointed service center.If
abnormality keeps going, the unit
might be damaged and lead to
electric shock or re.
User is not allowed to repair the
unit. Fault service may cause
electric shock or re accidents.
Please contact C&H appointed
service center for help.
Do not insert fingers or objects
into air outlet/inlet grille.
Never start up or shut off the air
conditioner by means of directly
plug or unplug the power cord.
Do not allow children
operate this unit.
Turn off the unit or cut off the
power supply before cleaning the
unit, otherwise electric shock or
injury may happen.
Do not expose the unit
to the moist or corrosive
circumstances.
Volatile liquid, such as diluent
or gas will damage the unit
appearance.Only use soft cloth
with a little neutral detergent to
clean the outer casing of unit.
Open the door and window and
keep good ventilation in the room
to avoid oxygen decit when
the gas/oil supplied heating
equipment is used.
Turn off the unit after it runs at
least ve minutes; otherwise it
will inuence oil return of the
compressor.
Do not operate this unit
with wet hands.
Never spray or ush water
towards unit, otherwise
malfunction or electric shock
may happen.
Electrify the unit 8 hours before
operation. Please switch on for
8 hours before operation. Do not
cut off the power when 24 hours
short-time halting (to protect the
compressor).
Under cooling mode, please
don't set the room temperature
too low and keep the
temperature difference between
indoor and outdoor unit within
5.
＜5Min
24H
26 C
30 C
C&H will not assume responsibility of personal injury or equipment damage caused by
improper installation and commission, unnecessary service and incapable of following the rules and
instructions listed in this manual.

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3
2 Product Introduction
C&H Multi VRF System adopts inverter compressor technology. By changing the displacement of
compressor, stepless capacity regulation within range of 10%~100% can be realized. Various product
lineups are provided with capacity range from 8kW to 16kW, which can be widely used in residential,
working area and especially applicable to places with big load change. C&H residential air conditioner
is absolutely your best choice.
2.1 Names of Main Parts
Air inlet
Air inlet
Air inlet
4
5
3
1 2
CHV-5S120NKCHV-5S140NK
CHV-5S160NK
Air Outlet
Air Outlet
Fig.1
NO.
Name Fan Motor Fan blade Electric box assembly Gas pipe valve Liquid pipe valve
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 ODUs
CHV-5S120NK 2 7
CHV-5S140NK 2 8
CHV-5S160NK 2 9
(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 Outdoor temperature: -5℃～ 48℃
Heating Indoor temperature: -20℃～ 27℃

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3 Preparation before Installation
Note: Graphics here are only for reference. Please refer to actual products.
Unspecied dimensions are all in mm.
3.1 Standard Parts
Please use the supplied standard parts as required.
Parts for Outdoor Unit
Number Name Appearance Quantity Remarks
1 Owner's Manual Applicable Models:
CHV-5S120NKCHV-5S140NK
CHV-5S160NK
Change for life
DC Inverter Multi
VRF System User Manual
Thank you for choosing Air Conditioners, please read this owner’s manual carefully before
operation and retain it for future reference.
C&H reserves the right to interpret this manual which will be subject to any change due to
product improvement without further notice
Air Conditioners
Owner's Manual
1
2Wiring (match with
resistance) 1
Must be connected to the
last IDU of communication
connection
3 Corrugated pipe 1
3.2 Installation Site
Forbidden Items! It indicates that improper operation might lead to human casualty or
sever injury.
Items need to be followed. It indicates that improper operation might lead to personal
injury or property damage.
Install the unit at a place where
is adequate to withstand the
weight of the unit and make
sure the unit would not shake
or fall off.
Never expose the unit under
direct sunshine and rainfall.
Install the unit at a place where
is against dust, typhoon and
earthquake.
Try to keep the unit away
from combustible,inammable
and corrosive gas or exhaust
gas.
Keep the indoor and outdoor
units close to each other as
much as possible so as to
decrease the pipe length and
bends.
Leave some space for heat
exchanging and servicing so
as to guarantee unit normal
operation.
Never allow children to
approach to the unit and take
measures to prevent children
touching the unit.

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If the ODU is totally surrounded by walls, please refer to the following figures for space
dimension:
≥350mm
≥350mm
≥200mm
≥2000mm
Shockproof
material
≥200mm ≥200mm
≥2000mm
Wall
Wall
Wall
Wall
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)
Φ6.35(1/4) ≥0.8
Φ9.52(3/8) ≥0.8
Φ12.70(1/2) ≥0.8
Φ15.9(5/8) ≥1.0
Φ19.05(3/4) ≥1.0

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4 Installation Instruction
Note: Graphics here are only for reference. Please refer to actual products. Unspecied
dimensions are all in mm.
4.1 Dimension of Outdoor Unit and Mounting Hole
Unit Outline and Installation Dimension(mm)
A
D
B
C
E
Fig.3
Mode A B C D E
CHV-5S120NK
CHV-5S140NK
CHV-5S160NK
900 340 1345 572 378

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4.2 Connection Pipe
4.2.1 Schematic Diagram of Piping Connection
Outdoor
Gas pipe
Liquid pipe
Connection pipe between ODU and the first indoor branch
Outdoor connection pipe
Branchs of IDUs
Connection pipe between indoor branch and IDUs
Connection pipe between indoor branch and IDUs
Connection pipe between indoor branch and IDUs
IDU 1
IDU 2
IDU 3
Connection pipe of indoor branchs
Connection pipe of indoor branchs
Connection pipe of indoor branchs
Fig.4

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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 gure below:
Note: Equivalent length of one Y-type branch is 0.5m.
a
d
c
b
The 1 branch section
Each Y-type branch equals to 0.5m and each branch header equals to 1.0m.
L1
L2
L3
Outdoor
Indoor
Intdoor Intdoor Intdoor
st
Fig.5 Allowable Length and Height Difference of Connection Pipe
Piping parameters of CHV-5S120NK, CHV-5S140NK and CHV-5S160NK:
Allowable value Fitting pipe
Total length (actual length) of tting pipe 300m L1+L2+L3+a+b+c+d
Length of farthest tting
pipe (m)
Actual length 120m L1+L2+L3+d
Equivalent length 150m
From the 1st branch to the farthest indoor pipe 40m L2+L3+d
Height difference
between ODU and IDU
ODU at upper side 50m —
ODU at lower side 40m —
Height difference between IDUs 15m —

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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.
Outdoor
Pipe between ODU and the 1 indoor branch
The 1 indoor branch
st
st
Fig.6
Dimension of outdoor connection pipe:
Basic module Pipe dimension Connection method
Gas pipe (mm) Liquid pipe (mm)
CHV-5S120NK Φ15.9 Φ9.52
Flared jointCHV-5S140NK Φ15.9 Φ9.52
CHV-5S160NK Φ19.05 Φ9.52
4.2.4 Selection of Indoor Branches
Select indoor branches according to the total capacity of downstream indoor units.
Outdoor
Indoor
Indoor branches
Fig.7
R410A Refrigerant system Total capacity of downstream indoor units C (kW) Model
Y type branch C 20.0 CH020N
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.

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Outdoor
Indoor
Pipe between
indoor branches
Fig.8
Total capacity of downstream indoor units C (kW) Gas pipe(mm) Liquid pipe(mm)
C ≤5.6 Φ12.7 Φ6.35
5.6 ＜C≤14.2 Φ15.9 Φ9.52
14.2 ＜C≤22.0 Φ19.05 Φ9.52
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.
Outdoor
Indoor
Indoor branches
Pipe between indoor branch and IDU
Fig.9
Rated capacity of IDU C(kW) Gas pipe(mm) Liquid pipe(mm)
C≤2.8 Φ9.52 Φ6.35
2.8 ＜C≤5.0 Φ12.7 Φ6.35
5.0 ＜C≤14.0 Φ15.9 Φ9.52
14.0 ＜C≤16.0 Φ19.05 Φ9.52
16.0 ＜C≤28.0 Φ22.2 Φ9.52
Note:
If the distance between IDU and its nearest branch is over 10m, then the liquid pipe of IDU
(rated capacity ≤5.0kW) shall be enlarged.

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4.3 Oil Loop
4.3.1 Objective of setting oil loop
When large drop height exists in the system, oil loop is required to be set on the vertical pipeline
so as to guarantee effective oil return to compressor.
4.3.2 Priciple of setting oil loop
When large drop height exists between indoor and outdoor units, oil loop is required to be set on
the vertical gas pipe for every 10m from down to the top. Oil loop can be made by 2 U-type bends or
an O-type bend. Its height should be 3~5 times of the pipe size.
4.3.3 Precautions for oil loop installation
1) Oil loop can be set as U-type or O-type.
2) If the drop height between indoor and outdoor units is above 10m, then oil loop is required to
be set on the vertical gas pipe for every 10m from down to the top, as well as at the lowest
and highest positions of the vertical pipe.
4.3.4 Making of the Oil Loop
A
R
C
Fig.10 Oil Loop
To prevent pipeline damage during pipe bending, please check the following table for the size of
oil return bend.
A R C
mm inch mm mm
Φ19.05 3/4 ≥34 ≤105
4.4 Installation of the Connection Pipe
4.4.1 Precautions for the 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. 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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4.4.2 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 ared nut connecting indoor connection pipe and outdoor unit. Then use aring
tool to x the ared nut into the pipe (as shown in Fig.11).
4) Check if the ared part is aring evenly and if there is any crack.
d1 d2
d1
d2
90°
±1°
Fig.11
4.4.3 Pipe Bending
1) Reshape the pipe by hand. Be careful not to damage the pipe.
Correct Wrong
Fig.12 Fig.13
2) Do not bend the pipe over 90°
3) If pipe is repeatedly bent or stretched, it will get hard and difcult 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.13. 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.
4.4.3 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.14. (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 ared nut is twisted forcibly.)
3) Use torque wrench to twist on the ared 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.15).
4) Use sponge to wrap the un-insulated connection pipe and joint. Then tie the sponge tightly
with plastic tape.
5) Connection pipe should be supported by a bearer rather than the unit.
6) 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.
7) 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.

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90o
Torque
wrench
Common
wrench
Pipe dimension Tightening torque
Fig.14 Fig.15
4.4.5 Outdoor Pipe Connection
Twist the ared nut on the connection pipe of outdoor valves. Twisting method is the same as for
indoor pipe connection.
Below is the piping diagram of CHV-5S120NK, CHV-5S140NK and CHV-5S160NK.
According to customer requirement or space limit, outlet pipe can be installed from the front, right or
rear side.
Gas pipe
Liquid pipe
Flared nut
Fig.16
4.4.6 Installation of Y-type Branch
1) Y-type Branch
Outdoor
Field suppliedField supplied
to other branches or IDUs
type branch
Inlet
Outlet 1
Outlet 2
Fig.17
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.18.
3) Y-type branch must be installed vertically or horizontally.
4) Branch shall be isolated by insulating material that can bear 120° or even higher temperature.
The attached foam of branch cannot be taken as insulating material.

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Within ±30°
Cut in the middle
Within ±30°
o
Fig.18
4.4.7 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 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 Thermal insulating material shall be able bear the pipe temperature. For heat pump unit, liquid
pipe should bear 70℃or above and gas pipe should bear 120℃or above. For cooling only
unit, both liquid pipe and gas pipe should bear 70℃or above.
Example: Polyethylene foam (bear 120℃ or above); foaming polyethylene (bear 100℃or above).
③ Joints of indoor and outdoor unit should be wrapped with insulating material and leave no gap
between pipe and wall. See Fig.19.
Thermal insulating layer is required to be wrapped at this part.
Thermal insulating pipe
No gap
Fig.19
④ 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.
⑤ 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.
⑥ After wrapping the pipe, apply sealing material to completely seal the hole on the wall.
4.4.8 Support and Protection of Pipeline
1) Support should be made for hanging connection pipe. Distance between each support cannot
be over 1m.
2) Protection against accidental damage should be made for outdoor pipeline. When pipeline
exceeds 1m, a pinch board should be added for protection.

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4.5 Disassembly of Compressor Feet
In order to prevent unit from damage during transportation, 2 metal pieces are tted to outdoor
unit’s compressor feet before unit leaves factory. See g.20.
Fasten the nut after removal Metal pieces
Metal pieces
Binding nut
Compressor
Fig.20
When installing the unit, metal pieces for transportation must be removed. Then fasten the
binding nuts again and wrap back soundproong cotton.
Note: If unit runs with metal pieces tting on, compressor will shake abnormally and unit’s
operating life will be shortened.
4.6 Vacuum Pumping, Refrigerant Adding
4.6.1 Vacuum Pumping
1) Outdoor unit has been charged with refrigerant before delivery. Field-installed connection pipe
needs to be charged with additional refrigerant.
2) Conrm 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.
Manometer
Gas valve
Liquid valve
LO knob
Connection hose
HI knob
Manometer
Vacuum pump
Fig.21
4.6.2 Refrigerant Adding
1) Refrigerant quantity of outdoor unit before delivery:
Mode CHV-5S120NK CHV-5S140NK CHV-160WL/A -T
Refrigerant Qty (kg) 5.0 5.0 5.0

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Notes:
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 eld-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 meter
Quantity of additional refrigerant per meter for liquid pipe(kg/m)
Φ22.2 Φ19.05 Φ15.9 Φ12.7 Φ9.52 Φ6.35
0.35 0.25 0.17 0.11 0.054 0.022
Note: Liquid pipe that is within 20m doesn’t need to be added with refrigerant.
First conrm that there is no leakage from the system. When compressor is not working, charge
additional R410a with specic amount to the unit through the lling opening of the liquid pipe valve of
the outdoor unit. If required amount cannot be quickly lled due to pressure increase of the pipe, then
set the unit in cooling startup and ll refrigerant from the low pressure check valve of the outdoor unit.
3) Calculation example
Outdoor
Indoor
Fig.22
Indoor
No. Indoor ①Indoor ②Indoor ③Indoor ④
Model Duct type
CHV-5SDS72NK
Duct type
CHV-5SDS50NK
Duct type
CHV-5SDS36NK
Duct type
CHV-5SDS25NK
Liquid pipe:
No. A B C D
Pipe size Φ9.52 Φ9.52 Φ9.52 Φ6.35
Length 10m 5m 5m 5m
No. a b c d
Pipe size Φ9.52 Φ6.35 Φ6.35 Φ6.35
Length 3m 3m 2m 1m
Total length of each liquid pipe
φ9.52: A+B+C+a=10+5+5+3=23m
φ6.35: D+b+c+d=5+3+2+1=11m
Note: Liquid pipe that is within 20m doesn’t need to be added with refrigerant.
Therefore, the minimum quantity of additional refrigerant = (23-20)×0.054+11×0.022 = 0.404kg

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4.7 Electric Wiring
4.7.1 Notices for Wiring
◆Install units according to national wiring codes.
◆Use air conditioner specialized power supply and make sure that it is consistent with system’s
rated voltage.
◆Do not pull the power cord with force.
◆All electrical installation must be performed by qualied technicians in accordance with local
laws, regulations and this user manual.
◆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.
◆Grounding Requirements
1) Air conditioner belongs to class I electrical appliance, so it must be securely grounded.
2) 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.
3) Power supply must include secure grounding terminal. Do not connect the ground wire to the
following:
① Water pipe; ② Gas pipe; ③ Drain pipe;
④ Other places that are deemed as not secure by professional technicians.
4.7.2 Wiring Diagram
1) Connection of power cord and communication wire
Separate power supply for Indoor and Outdoor
Outdoor
Indoor 1 Indoor 2 Indoor n
Power
Power
Power
Communication wire of IDUCommunication wire of IDU
Communication wire
between IDU and ODU
Power
Wired
controller
Wired
controller
Wired
controller
Wire
(resistance-matching)
Remote
monitor
D1
D2
G1
G2
D1
D2
H1
H2
D1
D2
H1
H2
D1
D2
H1
H2
Fig.23 Connection of power cord and communication wire for IDU and ODU
2) Selection of air switch and power cord
Model Power supply Air switch
capacity
Number of ground wire *
Min sectional area (mm2)
Number of power cord *
Min sectional area (mm2)
CHV-5S120NK 220-240V ～50H
208-230V ～60H 32 1×4.0 2×4.0
CHV-5S140NK 220-240V ～50H
208-230V ～60H 32 1×4.0 2×4.0
CHV-5S160NK 220-240V ～50H
208-230V ～60H 40 1×6.0 2×6.0
Note:
① Selection of circuit breaker and power cord in the above table is based upon unit’s maximum
power (maximum current).