MCU-Y6NEE
MCU-Y4NEE
MCU-Y4NEE1
MCU
installation manual
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E DB98-33933A(3)
Contents
Safety precautions . ................................................................................................................................................................................................................ 3
Preparing the installation . .................................................................................................................................................................................................. 5
Space requirements .............................................................................................................................................................................................................. 7
Installing the unit .................................................................................................................................................................................................................... 8
Refrigerant piping works . ................................................................................................................................................................................................ 11
Wiring works .......................................................................................................................................................................................................................... 17
Commisioning . ..................................................................................................................................................................................................................... 23
2
Safety precautions
The safety information and precautions below must be kept for the safety of users and installers.
Before installing an air conditioner, please read this manual thoroughly to ensure that you know how to safely and
efficiently install a new appliance.
 DVM PLUS IV air conditioner uses R410A refrigerant.
- When using R410A, moisture or foreign substances may affect the capacity and reliability of the product.
Safety precautions must be taken when installing the refrigerant pipe.
- The designing pressure of the system is 4.1MPa. Select appropriate material and thickness according to the regulations.
- R410A is a quasi-azeotrope of two refrigerants.
Make sure to charge with liquid phase when filling refrigerant.
If you charge gaseous refrigerant, it may affect the capacity and reliability of the product as a result of change
formation of the refrigerant.
 Connect the indoor units for R410A refrigerant. Check whether the indoor units can be connected with the product’s
catalogue. (When incorrect indoor units are connected, they cannot operate normally.)
After installation and trial operation, explain to the customer how to use the air conditioner and give the installation manual
to the user.
The manufacturer is not responsible for accidents due to incorrect installation. Any claims caused by failing to keep the safety
precautions are installer’s responsibility. (The installer is responsible for the service cost.)
WARNING
In case of not following the safety precautions, the service agent or the user may get the risk of
serious wound or death.
CAUTION
In case of not following the safety precautions, the service agent or the user may get the risk of
injury or loss of property.
FOR INSTALLATION
WARNING
Installation must be done by the installer or its service agent.
 Installation by an unqualified person may cause a water leakage, electric shock or fire and so on.
Install the unit correctly according to the installation manual.
 An incorrect installation may cause a water leakage, electric shock or fire.
When installing the unit in a small place, take measures in order to keep the refrigerant concentration from exceeding allowable
safety limits in the event of a refrigerant leak.
 Excessive refrigerant concentration can lead to suffocation.
If any gas or impurities except R410 refrigerant get into the refrigerant pipe, serious problems may occur and this may cause
injury.
When installing the unit, only use the components and tools which are specified for the installation.
 Using the uncertified components and tools may cause a unit fall, water leakage, electric shock, and a fire.
(Never use the components and pipe for R22 refrigerant)
Install the unit safely on a place that can support its weight.
 If the place cannot support its weight, the unit may fall down and cause injury.
Check out the safety precautions below before installing or fixing the unit.
 Before welding the unit, you must remove all the hazardous materials around the unit that may cause an explosion and a fire.
 When refrigerant is in the product or the pipe before welding the unit, you must remove the refrigerant.
- If you weld the unit when there is refrigerant inside, the increased pressure of refrigerant may explode or break the leaking spot so that
causes serious injuries.
 When welding the unit, please use nitrogen gas to prevent oxide from generating in the pipe
Make sure to cut off all the power supply before installing, fixing, and cleaning the unit.
When the electric wire is damaged, you must exchange it by the manufacturer or its service agent, or a person who has the
equivalent qualification.
When turning on the power, make sure to connect the power supply to the circuit breaker designated for indoor units. (ELCB,
ELB, MCCB)
 If you do not install the circuit breaker for MCU(ELCB, ELB, MCCB), excessive current or failure to blocking the power supply may cause
electric shock, a fire.
3
Safety precautions
FOR INSTALLATION
WARNING
Make sure to connect wires thoroughly and fix them firmly so that no outer pressure of the wires would put on the terminal
block.
 If the terminal is loose, it may generate heat and cause a fire.
Supplied power should be more or less than 2% of the rated power.
 If the power is supplied unevenly, a life span of the storage battery shortens. If the supplied power is more than 4 % of the rated power,
the unit terminates and indicates errors to protect it.
Make sure the interior power supply shouldn’t be over the maximum voltage or under the minimum voltage.
 Otherwise, it could result in malfunction of the unit due to damaged electrical components or decreased function of components.
Only use copper wire as the power cable and all wiring, components and materials should comply with the applicable local and
national codes.
Make sure that all wiring is properly installed.
 Otherwise, the unit can be heated and cause a fire.
Never use the pipe and flare parts for R22 refrigerant.
In case of a refrigerant gas leakage during installation, please ventilate the area.
 If refrigerant gas combines with inflammable materials, toxic gases can be generated.
The electric work must be done by service agent or qualified persons according to national wiring regulations and use only rated
cable.
 Voltage drop, shortage of power supply, improper electric work and using unapproved wires can cause an electric shock or a fire.
FOR INSTALLATION
CAUTION
Make sure to earth.
 Do not connect the earth wire to the gas pipe, lighting rod or telephone wire.
 If earthing is incomplete, electric shock or fire may occur.
Make sure that the condensed water from the drain hose runs out properly based on this installation manual and insulate the
drain pipe so that frost does not generate.
 If the draining work is done incompletely, property damage may occur due to a leakage.
Install the power cable and communication cable of MCU at least 1m away from the electric appliances and at least 2m away
from the lightning rod.
 However, you may hear a noise 1 meter away from the unit depending on the condition of the electric wave.
Install MCU away from lighting apparatus using the ballast.
 If you use the wireless remote control, it may not operate normally.
Do not install the unit in following places.
 The place packed with mineral oil and the place where there are lots of moisture, or arsenic acid:
The resin parts may burn and cause the fall of the components or a refrigerant leakage.
 The place where corrosive gas such as sulfurous acid gas generates from the vent pipe or air outlet:
The copper pipe or connection pipe may corrode and refrigerant may leak.
 The place where there is a machine that generates electromagnetic waves:
The unit may not operate normally due to malfunction in the control system.
 The place where there is a possibility of combustible gas leakage, and where inflammable materials like thinner or gasoline is
handled. The place where a carbon fiber or inflammable dust is floating in the air:
If the gas leaks and stays around the main valve, it may result in a fire.
 The places where have a possibility of the MCU corrosion like a spa and a shore.
When there is a possibility that the place in which MCU is installed could be the shelter of small animals, take proper measures to
prevent this situation in advance.
 If small animals contact the unit, this may result in malfunction of the unit or cause a fire and smoke. Please remind users of cleaning the
place around MCU.
 Any claims caused by failing to keep the safety precautions are installer’s responsibility.
(The installer is responsible for the service cost.)
4
Preparing the installation
Accessories
Please check if items below are included in installation accessories.
Name
Y-connector(Φ9.52,Φ15.88)
Pipe socket
Drain socket
Shape
Insulation (for pipe) Insulation (for base) Installation manual
Name
Pattern sheet
Cable tie
Shape
Selecting the refrigerant pipe for installation
The design pressure of MCU for R410a is about 4.1 MPa. For safe use of the product, please refer to the table below in selecting
the installation pipe.
Outer diameter [mm]
ø6.35
ø9.52
ø12.70
ø15.88
ø19.05
ø22.23
ø25.40
ø28.58
ø31.75
ø38.10
ø44.45
ø50.80
Minimum thickness [mm]
0.7
0.7
0.8
1.0
0.9
0.9
1.0
1.1
1.1
1.35
1.6
2.0
Material
C1220T-O
C1220T-1/2H
or
C1220T-H
• M
ake sure to use C1220T-1/2H(Semi-hard) material for pipes larger than Ø19.05mm.
In case of using C1220T-O(soft) pipe for ø19.05mm, pipe may be broken, which can result in an injury.
5
Preparing the installation
MCU indoor/outdoor unit compatible table
Before installing MCU, refer to the compatible table below and find the model before installation.
Outdoor Unit
MCU
Indoor Unit
MCU-Y6NEE
MCU-Y4NEE
AVXC✴✴✴✴✴✴✴
AVXW✴✴✴✴✴✴✴
AVXT✴✴✴✴✴✴✴
AVXD✴✴✴✴✴✴✴
MCU-Y4NEE1
ND200/220/280 ✴✴✴✴✴✴✴
RD✴✴✴HRXGA✴
MCU Kit
Model
MCU-Y6NEE
Below 6 indoor units, below 46.4kW
Description
MCU-Y4NEE
Below 4 indoor units, below 46.4kW
MCU-Y4NEE1
Below 2 large capacity ducts, below 46.4kW
Liquid pipe connected to indoor unit
Gas pipe connected to indoor unit
<Side view of MCU>
6
Space requirements
1. Since refrigerant noise can be generated during the MCU operation, do not install the unit on the ceiling of the places
that requires silence such as bedrooms, libraries, hospitals and offices etc.
2. Do not install the MCU in the ceiling of the living area. Otherwise, noise generated from the MCU may disturb people in
that area and cause inconvenience.
<Spaces with developed ceiling>
<Ceiling of the office>
3. It is normally recommended to install MCU in a hallway but a bulkhead should be installed to minimize the noise from
being transferred to living area. (Refer to the below figure)
MCU
Living area
Hallway
MCU
Bulkhead
Living area
Living area
<There is no risk of noise transfer>
Hallway
Living area
<There is a risk of noise transfer>
 S
oundproof and soundproofing materials
 T
he place where MCU is installed and the interior walls should have a high soundproof ability.
(Bricks, Concretes, Cement)
 T
he ceiling where MCU is installed should be coated with quality Tex that has a good soundproof function.
 M
inimize the size of the hole between the walls and the pipe connection. After the installation, block the gap to prevent
noise from leaking.
4. Secure over 0.25m of space when MCU is being fixed to the concrete of the ceiling.
5. MCU may generate noise so don’t install it too close to the ceiling Tex.
6. Each pipe hanger should be placed at 1.5m interval to support its weight firmly.
If the pipe or the hanger isn’t fixed firmly, the unit may fall and cause a property damage or loss of life.
7
Space requirements
7. Select the place where MCU supporting structure can support the weight of the indoor unit and have strong vibration
resistance without any slope.
(If the structure is not strong enough, MCU may fall down and break, which can cause injury to your body.)
Ceiling concrete
0.25m or more
Pipe hanger
MCU
1.5m or less
1.5m or less
Refrigerant pipe
Do not install the MCU to close to the ceiling Tex(minimum 50mm)
Ceiling tex
8. Select a place with enough space for repairing and services.
(Leave enough space between sidewalls in installation.-refer to the picture below)
400mm or more
400mm or
more
MCU
500mm or
more
700mm or more
Installing the unit
1. MCU specification
Model
MCU-Y6NEE
MCU-Y4NEE
MCU-Y4NEE1
Number of connectable indoor
units
Up to 6 units
Up to 4 units
Only for large capacity duct
(20.0kW)
The maximum capacity of the
connectable indoor units
44.8kW
44.8kW
56.0kW
The exterior of MCU
Internal EEV
8
Not included
Cannot connect indoor unit without internal EEV.
Up to 2 units
2. Installing the indoor unis
Model
MCU-Y6NEE
MCU-Y4NEE
MCU-Y4NEE1
Example
installing
Large capacity duct unit : Use
Y-connector at the Gas & Liquid Line
❈ Only for large capacity duct
(20.0kW Over)
Installing Under 10.0kW indoor unit : Don't use Y-connector
indoor
11.2kW ~ 14.0kW indoor unit : Use Y-connector at the Gas & Liquid Line
units
❈ Can not connect to large capacity duct (20.0kW Over)
3. Preparation before installation.
1)Place the pattern sheet on the ceiling at the spot where you want to install the
indoor unit.
• S ince the diagram is made of paper, it may shrink or stretch slightly due
to temperature or humidity. For this reason, before drilling the holes
maintain the correct dimensions between the markings.
Concrete
2)Insert bolt anchors, use existing ceiling supports or construct a suitable support
as shown in figure.
Insert
Hole in anchor
Hole in plug
3) Install the suspension bolts depending on the ceiling type.
• E nsure that the ceiling is strong enough to support the weight of the
indoor unit. Before hanging the unit, test the strength of each attached
suspension bolt.
• If the length of suspension bolt is more than 1.5m, it is required to
prevent vibration.
• If this is not possible, create an opening on the false ceiling in order to
be able to use it to perform the required operations on the indoor unit.
Suspension bolt(3/8" or M10)
Ceiling support
4. Cautions about MCU installation.
 When fixing the unit at the upper place using suspension bolts, use a nut and washer to vertically fasten the unit.
 There are four spots to fix the suspension bolts. Make sure every spot is fixed.
The upper and the lower side of MCU is distinguished, so be careful not to turn the unit upside down when installing the
224
224
unit. Otherwise, noise may be generated or the product may be damaged.
764 (Between the locations of suspension bolts)
(Unit :mm)
Anti vibration
rubber
Nut
Washer
Fasten the nut firmly
<Location and intervals of fixed suspension bolts>
<Fixing the bolt>
9
Installing the unit
5. How to connect the pipe line.
70mm
Protect with
wet towel when
brazing
70mm
Pipe connection from outdoor unit
Low pressure gas pipe connection (Brazing)
High pressure gas pipe connection (Brazing)
Liquid pipe connection (Flare)
Pipe connection to indoor unit
Liquid pipe(Flare)
Gas pipe (Flare)
 W
hen installing MCU, use the pattern sheet for installation that is provided with the product.
 When brazing
the high / low pressure gas pipe, protect the product with the flame-proof sheet.
6. How to connet Y-connector
 In case of connecting one indoor with Y-Connector to MCU, Y-Connector must be connected in series.
Indoor #1 Indoor #2
<Good Example of connection>
10
<No Good Example of connection>
Refrigerant piping works
 For installation of the refrigerant pipes, please refer to corresponding outdoor unit installation manual.
 Since R410a has a high working pressure, only use the regulated refrigerant pipe and follow proper installation method.
 Finish the gas pipe and the liquid pipe works with the insulation base. If the insulation work isn’t done properly,
condensation water may flow indoor and part of the ceiling can be damaged by heat.
 In brazing the pipe, please follow the prescribed brazing method. (Please refer to outdoor unit installation manual)
Refrigerant pipe installation
Method
Branch with Y-joint
Using MCU
only
Using Y- joint
and MCU
Items
Examples
Using MCU only
Piping
200m below
(Equivalent (220m below)
Using Y-joint and MCU
piping)
Max.
piping
length
Outdoor ~
Outdoor unit
Outdoor ~
Indoor unit
a+b+c+d+e+f+g ≤ 1000 m
Using Y-joint and MCU
a+b+c+d+e+f+g+p+h+i+j+k+m+n
≤ 1000 m
1000m below
Piping
10 m below
r ≤ 10, s ≤ 10, t ≤ 10 m
Equivalent 13 m below
piping
r ≤ 13, s ≤ 13, t ≤ 13 m
50 m / 40 m*1) H1 ≤ 50/40 m
Piping
15m below
H2 ≤ 15 m
Piping
5m below
H3 ≤ 5 m
Piping
15m below
H4 ≤ 15 m
Allowable
The first branch ~
length
Piping
the farthest
after
Indoor unit
branch
45 m below
MCU~MCU
a+g+m ≤ 200 m (220 m)
Using MCU only
Total
piping
Piping
Indoor ~
Level
Indoor unit
difference
Outdoor ~
Outdoor unit
a+b+c+d+e+f+g ≤ 200 m (220m)
Using MCU only
45 m
Using Y-joint and MCU
g+m ≤ 45 m
*1) As an outdoor unit is located in a lower position than indoor unit, level difference is 40m.
Remarks
Equivalent pipe
length.
Y joint : 0.5m,
Header : 1m,
MCU : 1m
11
Refrigerant piping works
Selecting the refrigerant pipe
When selecting the refrigerant pipe, refer to the table below. (The amount of additional MCU refrigerant : 0.5 Kg)
Outdoor unit connection pipe size : (A1), (A2), (A3)
12HP
14HP 16HP
(A1)
(A1)
(A1)
(A2)
(D)
(E)
(A3)
(F)
(B)
• Example) 42HP of compact
combinations
HP Mark
12
14
16
26
42
(A1)
(A1)
(A1)
(A2)
(A3)
A1 : Select the pipes according to the outdoor unit ■ Branch joint of outdoor unit’s multi
capacity with following table.
connection (D)
A2 : Select the pipes according to sum of outdoor
Capacity of
Model
unit capacities behind the outdoor joint with
outdoor
following table.
Below 48 HP
Liquid & Low MXJ-T3819✴
A3 : Select the main pipe of outdoor units with the
gas pipe
Above 50 HP
MXJ-T4422✴
following table.
Below 48 HP
MXJ-T3100✴
High
gas
pipe
Pipe size (O.D. mm), (A)
Oil
Above 50 HP
Outdoor
MXJ-T3800
✴
balancing
unit
(C)
Pipe size (O. D.mm)
Liquid Low gas High gas
Ø12.70 Ø25.40 Ø22.23
Ø12.70 Ø25.40 Ø22.23
Ø12.70 Ø28.58 Ø22.23
Ø19.05 Ø31.75 Ø28.58
Ø19.05 Ø38.10 Ø31.75
Branch joint : (D), (E), (F)
Liquid
8HP
10HP
12HP
14HP
16HP
18HP
20HP
22HP
24HP
26~30HP
32~34HP
36~48HP
50~60HP
Gas
High gas
Ø19.05
Ø9.52 Ø22.23
Ø12.70 Ø25.40
pipe size
Ø15.88
Ø19.05
■ First branch joint (E)
Select branch joint according to outdoor
unit’s capacity.
Ø22.23
Ø15.88 Ø28.58
Ø25.40
Ø19.05 Ø31.75
Ø38.10
Ø22.23 Ø44.45
Ø28.58
Ø31.75
Ø38.10
Ø6.35
*A1 : Pipes to the outdoor unit (Liquid, Gas, High pressure gas)
*A2 : Pipes between outdoor joint kits
(Liquid, Gas, High pressure gas)
*A3 : Main pipes (Liquid, Gas, High pressure gas)
Pipe size between branch joints : (B)
Select the pipe size according to the capacity sum of
indoor units which are connected below this pipe.
Total indoor unit’s
capacity
15.0 kW and below
Over 15.0~23.2 kW and below
Over 23.2~29.0 kW and below
Over 29.0~40.6 kW and below
Over 40.6~46.4 kW and below
Over 46.4~69.6 kW and below
Over 69.6~98.6 kW and below
Over 98.6~139.2 kW and below
Over 139.2 kW
Pipe size (O.D. mm)
Liquid
Ø9.52
Ø12.70
Ø15.88
Ø19.05
Ø22.23
Gas
High gas
Ø15.88
Ø19.05
Ø22.23
Ø25.40
Ø28.58
Ø31.75
Ø38.10
Ø44.45
Ø15.88
Ø19.05
Ø22.23
Ø25.40
Ø28.58
Ø31.75
Ø38.10
Liquid
& Low
pressure
gas
Y-joint (E)
Outdoor unit
8 ~ 14 HP
16 HP
18 ~ 24HP
26 ~ 34HP
36 ~ 48HP
50 ~ 60HP
MXJ-YA2512✴
MXJ-YA2812✴
MXJ-YA2815✴
MXJ-YA3119✴
MXJ-YA3819✴
MXJ-YA4422✴
Model
High
pressure
gas
Y-joint (E)
Outdoor unit
8 HP
10 ~ 24 HP
26 ~ 48 HP
50 ~ 60HP
MXJ-YA1500✴
MXJ-YA2500✴
MXJ-YA3100✴
MXJ-YA3800✴
Model
■ Branch joint (F)
Liquid
& low
pressure
gas
Y-joint
(F)
Model
MXJ-YA1509✴
MXJ-YA2512✴
MXJ-YA2812✴
MXJ-YA2815✴
MXJ-YA3119✴
MXJ-YA3819✴
MXJ-YA4422✴
Total indoor unit’s capacity
15.0 kW and below
Over 15.0~40.6 kW and below
Over 40.6~46.4 kW and below
Over 46.4~69.6 kW and below
Over 69.6~98.6 kW and below
Over 98.6~139.2 kW and below
Over 139.2 kW
Model
Total indoor unit’s capacity
Pipe size between branch joints and indoor High
23.2 kW and below
pressure MXJ-YA1500✴
unit : (C)
gas MXJ-YA2500✴ Over 23.2 ~ 69.6 kW and below
Select the pipe size according to the indoor
Y-joint MXJ-YA3100✴ Over 69.6 ~ 139.2 kW and below
unit’s capacity.
(F)
Over 139.2 kW
MXJ-YA3800✴
Indoor unit’s capacity
2.2~5.6 kW
7.1~14.0 kW
Pipe size (O. D. mm)
Liquid pipe Gas pipe
Ø6.35
Ø12.70
Ø9.52
Ø15.88
• The sum of the total capacity of the indoor units connected to a MCU should not be over the max. 44.8kW.
12
Simultaneous heating and cooling- Additional refrigerant
Additional refrigerant charging
■ Additional refrigerant is charged according to the length and size of liquid pipe.
• Example) Additional refrigerant charging
Liquid pipe size (O.D. mm)
Additional refrigerant charging (kg/m)
Ø6.35
Ø9.52
Ø12.70
Ø15.88
Ø19.05
Ø22.23
Ø25.40
0.02
0.06
0.125
0.18
0.27
0.35
0.53
61.6kW
Ø12.70(1m)
Ø12.70(5m)
MCU
Ø19.05(10m)
Ø15.88(10m)
Ø6.35(15m)
Ø9.52
(10m)
11.2kW
Ø9.52
(15m)
7.1kW
 The amount of the refrigerant that is already placed in
Ø15.88(10m)
MCU
2.8kW
Ø6.35(10m)
Classification
8HP
Standard
5.0
10HP 12HP 14HP 16HP 18HP 20HP
5.0
5.0
7.0
7.0
Additional refrigerant charging of MCU kit
Ø6.35(2m)
MCU kit
7.1kW
Ø9.52 Ø9.52(25m)
(25m)
Additional refrigerant charging of distribution kit (kg/m)
Ø9.52(18m)
7.1kW
11.2kW
7.1kW
8.5
(kg/unit)
7.1kW
Additional refrigerant charging of MCU is 0.5kg for every
Ø9.52(15m)
Regardless of the liquid pipe size, additional refrigerant
charging is 0.01kg per meter after distribution kit
8.5
0.01
0.5
Remarks
For wall-mounted &
ceiling indoor unit
 Charge the additional refrigerant according to the indoor unit
capacity. The amount of the additional refrigerant charging for each
indoor unit capacity = 0.046kg/kW
 The method to calculate the total amount of the refrigerant.
- The amount of the refrigerant according to the pipe size and length (ⓐ)
- The amount of additional refrigerant charging for each indoor unit (ⓑ) =
∑ (Indoor unit capacity) x 0.046
- The amount of other additional refrigerant charging (ⓒ) = ∑(The number
of MCU Kit installed) x 0.5
- The total amount of the additional refrigerant charging = ⓐ+ⓑ+ⓒ
■ Example of additional refrigerant charging. Pipe length is as below.
Liquid pipe size
Pipe length after
Ø6.35 Ø9.52 Ø12.70 Ø15.88 Ø19.05 MCU
(O.D. mm)
distribution kit (m)
Length (m)
25
101
6
20
10
2 Ea
2
❈ⓐ
= 25x0.02 +101x0.06 + 6x0.125 + 20x0.18 + 10x0.27 = 13.61kg
ⓑ = (11.2x2 + 7.1x5 + 2.8x1)x0.046 = 2.7922kg
ⓒ = 2x0.01 + 2x0.5 = 1.02
The total amount of the additional refrigerant charging :
ⓐ+ⓑ+ⓒ = 13.61 + 2.792 + 1.02 = 17.422kg
❈ Total refrigerant amount of the system must be less than 100kg.
If total refrigerant amount of system is over 100kg, the system has to be
divided into smaller system, each containing less than 100kg.
ex) 20HP outdoor refrigerant is already charged 8.5kg, so the additional
refrigerant must not be over 91.5kg.
• T otal amount of refrigerant in the system must be less then 100kg. If total amount of refrigerant in the system is
over 100kg, the system has to be divided into smaller system, each containing less than 100kg.
13
Refrigerant piping works
Method and cautions on brazing the pipe
Keeping refrigerant pipe clean and dry
 To prevent foreign materials or water from entering the pipe, it is important to keep the refrigerant pipe clean, dry and sealed
during installation.
Exposure place
Outside exposure
Exposure time
Sealing type
Longer than one month
Pipe pinch
Shorter than one month
Taping
-
Taping
Inside exposure
Brazing the pipe
 Make sure that there is no moisture inside the pipe.
 Make sure that there are no foreign materials and impurities in the pipe.
 Make sure that there is no leak.
 Make sure to follow the instruction when brazing the pipe.
The use of Nitrogen gas
1.Use Nitrogen gas when brazing the pipes as shown in the picture.
2.If you don’t use Nitrogen gas when brazing the pipes, oxide may form
inside the pipe. It can cause the damage of the compressor and valves.
3.Adjust the flow rate of the nitrogen gas with a pressure regulator to
maintain 0.05m3/h or less.
1/4" copper pipe
Brazing part
Nitrogen gas
Pressure regulator
Stop valve
Taping
Flowmeter
Direction of the pipe when brazing
• Performing the brazing of the pipe should be headed downwards or
horizontally.
Method and cautions on refrigerant pipe insulation
Make sure to check for gas leakage before completing the installation (hose and pipe insulation) and insulate hoses and pipes
when there is no sign of leakage.
No gap
1. To avoid condensation problems, place T13.0 or thicker Acrylonitrile Butadien
Rubber separately around each refrigerant pipe.
• Always make the seam of pipes face upwards.
NBR(T13.0 or thicker)
2. Wind insulating tape around the pipes and drain hose avoiding to compress
the insulation too much.
3. Finish wrapping insulating tape around the rest of the pipes leading to the
outdoor unit.
4. The pipes and electrical cables connecting the indoor unit with the outdoor
unit must be fixed to the wall with suitable ducts.
• A
ll refrigerant connection must be accessible, in order to permit
either unit maintenance or removing it completely.
14
Insulation cover pipe
Insulation pipe
Indoor
unit
Be sure to overlap
the insulation
• M
ust fit tightly against
body without any gap.
5. Select the insulation of the refrigerant pipe.
 Insulate the gas side and liquid side pipe referring to the thickness according to the pipe size.
Indoor temperature of 30°C and humidity of 85% is the standard condition. If install in a high humidity condition, use one grade thicker
insulator by referring to the table below. If installing in an unfavorable conditions,use thicker one.
 Insulator’s heat-resistance temperature should be more than 120°C.
Pipe
Pipe size
Liquid
pipe
ø6.35~ø9.52
ø12.70~ø50.80
ø6.35
ø9.52
ø12.70
ø15.88
ø19.05
ø22.23
ø25.40
ø28.58
ø31.75
ø38.10
ø44.45
ø50.80
Gas
Pipe
Insulation Type(Heating/Cooling)
Standard
High humidity
[30°C, 85%]
[30°C, over85%]
EPDM, NBR
9t
9t
13t
13t
13t
19t
Remarks
25t
Internal temperature
is higher than 120°C
19t
32t
25t
Refrigerant pipe before EEV kit and MCU or without EEV kit and MCU
 You can contact the gas side and liquid side pipes but the pipes
should not be pressed.
 When contacting the gas side and gas side pipe, use 1 grade thicker
insulator.
Refrigerant pipe after EEV kit and MCU
 Install the gas side and liquid side pipes, leave 10mm of space.
 When contacting the gas side and liquid side pipe, use 1 grade
thicker insulation.
38t
Insulation
Insulation
Liquid pipe
Gas pipe
10mm
10mm
Gas pipe
10mm
10mm
Liquid pipe
• I nstall the insulation not to get wider and use the adhesives on the connection part of it to
prevent moisture from entering.
• Wind the refrigerant pipe with insulation tape
if it is exposed to outside sunlight.
Hanger
• Install the refrigerant pipe respecting that the
insulation does not get thinner on the bent
part or hanger of pipe.
• Add the additional insulation
if the insulation plate gets thinner.
Additional insulation
a
a×3
Refrigerant pipe insulation
15
Refrigerant piping works
Draining form
Without the drain pump
1. Install horizontal drainpipe with a slope of 1/100 or more and fix it by hanger space of 1.0~1.5m.
2. Install U-trap at the end of the drainpipe to prevent a nasty smell to reach the indoor unit.
3. Do not install the drainpipe to upward position. It may cause water flow back to the unit.
1~1.5m
Hanger
Flexible hose
Horizontal drainpipe
more than 1/100 slope
Ceiling
With the drain pump
1. The drain pipe should be installed within 300mm to 550mm from the flexible hose and then lift down 20mm or more.
2. Install horizontal drainpipe with a slope of 1/100 or more and fix it by hanger space of 1.0~1.5m.
3. Install the air vent in the horizontal drainpipe to prevent water flow back to the indoor unit.
• You may not need to install it if there were proper slope in the horizontal drainpipe.
4. The flexible hose should not be installed upward position, it may cause water flow back to the indoor unit.
Air vent
300mm or less
Flexible hose
1~1.5m
200mm
or more
20mm
or more
Hanger
Within
300~550mm
Horizontal drainpipe
more than 1/100 slope
Ceiling
16
Wiring works
Installing the circuit breaker and wires
Power supply
MCCB
ELB
XA
X A, 30mmA
0.1 sec
Max : 242V
Min : 198V

Power cable Earth cable
2.5mm2
Communication cable
2.5mm2
0.75~1.5mm2
Decide the capacity of ELB and MCCB by below formula.
The capacity of ELB, MCCB X[A] = 1.25 X 1.1 X ∑Ai
❈
X : The capacity of ELB, MCCB
❈
∑Ai : Sum of Rating currents of each indoor unit.
❈
Refer to each installation manual about the rating current of indoor unit.

Decide the power cable specification and maximum length within 10% power drop among indoor units.
n
Coef×35.6×Lk×ik
k=1
1000×Ak
∑(
) < 10% of input voltage[V]
T Coef: 1.55
T Lk: Distance among each indoor unit[m], Ak: Power cable specification[mm2]
ik: Running current of each unit[A]
Example of Installation
 Total power cable length L = 100(m), Running current of each units 1[A]
 Total 10 indoor units were installed
10[A]
ELB
9[A]
Indoor unit1
0[m]
10[m]
 Apply following equation.
n
Coef×35.6×Lk×ik
∑(
k=1
1000×Ak
❈
Calculation
- Installing with 1 sort wire
Indoor unit10
100[m]
) < 10% of input voltage[V]
2.5[mm2]
2.5[mm2]
-2.0[V]
············ 2.5[mm2] ············
208.8[V](Within 198V~242V)
it's okay
-(2.2+2.0+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-11.2[V]
- Installing with 2 different sort wire
4.0[mm2]
220[V]
❈
Indoor unit2
20[m]
-2.2[V]
220[V]
1[A]
MCCB
-1.4[V]
4.0[mm2]
············ 2.5[mm2] ············
-1.2[V]
-(1.4+1.2+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-10.5[V]
209.5[V](Within 198V~242V)
it's okay
If the terminal input pressure of the indoor unit goes down by more than 10%, install the thicker wire.
17
Wiring works
Rated current
Unit
AVXCS✴✴
AVXC2✴✴
ND✴✴✴4✴✴✴
AVXCM✴✴
AVXWV✴✴
AVXDS✴A
AVXDS✴P
AVXDU✴✴
ND✴✴✴HH✴✴✴
18
Model
Rating current (A)
✴✴022✴✴
✴✴028✴✴
✴✴036✴✴
✴✴052✴✴
✴✴056✴✴
✴✴060✴✴
✴✴071✴✴
✴✴072✴✴
✴✴045✴✴
✴✴056✴✴
✴✴071✴✴
✴✴090✴✴
✴✴112✴✴
✴✴128✴✴
✴✴140✴✴
✴✴028✴✴
✴✴036✴✴
✴✴056✴✴
✴✴071✴✴
✴✴022✴✴
✴✴028✴✴
✴✴036✴✴
✴✴056✴✴
✴✴071✴✴
✴✴022✴✴
✴✴028✴✴
✴✴036✴✴
✴✴040✴✴
✴✴045✴✴
✴✴056✴✴
✴✴071✴✴
✴✴090✴✴
✴✴112✴✴
✴✴128✴✴
✴✴140✴✴
✴✴071✴✴
✴✴090✴✴
✴✴112✴✴
✴✴128✴✴
✴✴140✴✴
✴✴056✴✴
✴✴071✴✴
✴✴090✴✴
✴✴112✴✴
✴✴128✴✴
✴✴140✴✴
✴✴200✴✴
✴✴220✴✴
✴✴280✴✴
0.20
0.23
0.25
0.38
0.38
0.40
0.40
0.40
0.15
0.15
0.21
0.30
0.36
0.36
0.45
0.50
0.50
0.52
0.55
0.13
0.18
0.19
0.30
0.30
0.40
0.40
0.40
0.60
0.60
0.60
0.60
1.00
1.00
1.20
1.20
0.96
0.96
0.96
1.13
1.24
1.10
1.25
1.30
1.17
1.62
1.86
3.30
3.80
5.90
Installing the wire
 Supply the 220-240V power to L, N of MCU separately with outdoor unit.
 Connect the communication cable from the outdoor unit to F1, F2 of MCU.
 Power Line and communication line must be connected as shown in drawing.
Case 1
Indoor
Unit
Case 2
ELB
MCCB
Indoor
Unit
Indoor
Unit
Outdoor
Unit
Indoor
Unit
220-240V
(Supply separately)
ELB
MCCB
Outdoor
Unit
220-240V
(Supply separately)
Input socket
 Choose the compressed socket based on the cross-section of the connecting wire.
Silver solder
B
D
d1
E
F
L
d2
t
Norminal
Norminal
Standard
Standard
Standard
Standard
dimensions for dimensions for
Allowance
Allowance
Allowance
Allowance
cable (mm2) screw (mm) dimension (mm) dimension (mm) dimension (mm) Min. Min. Max. dimension (mm) Min.
(mm)
(mm)
(mm)
(mm)
1.5
2.5
4
4
4
4
4
6.6
8
6.6
8.5
4
9.5
±0.2
3.4
±0.2
4.2
±0.2
5.6
+0.3
-0.2
+0.3
-0.2
+0.3
-0.2
1.7
±0.2
4.1
6
16
4.3
2.3
±0.2
6
6
17.5
4.3
3.4
±0.2
6
5
20
4.3
+0.2
0
+0.2
0
+0.2
0
0.7
0.8
0.9
19
Wiring works
Setting address and option
PCB Layout
 Turn off the DIP switch on the MCU PCB when pipe is not connected.
DIP switch for indoor unit setting (ON:Use, OFF:Not use)
Rotary switch for indoor unit ADDRESS
Rotary switch for MCU ADDRESS
Setting MCU address
 Set the rotary switch of the indoor unit ADDRESS on the MCU PCB same as the ADDRESS of connected indoor unit.
 When installing more than 2 MCU, set each rotary switch for MCU ADDRESS properly.
Outdoor Unit PCB
�
�� �
����
����
����
Setting the
number of
Indoor Unit
MCU PCB
MCU ADDRESS
MCU DIP S/W
Setting the
number of
MCU
MCU ADDRESS
MCU PCB
MCU DIP S/W
Indoor Unit ADDRESS
Indoor Unit ADDRESS
Indoor Unit
Indoor Unit
Connecting indoor with Y-Connector to MCU
 In case of connecting one indoor with Y-Connector to MCU, set the MCU address same about connected two indoors and set
MCU DIP S/W using two indoors.
Y-connector installation
MCU PCB
MCU DIP S/W
Indoor #2
Indoor Unit ADDRESS
20
Indoor #1
Setting MCU option
DIP switch for indoor unit setting (ON:Use, OFF:Not use)
Rotary switch for Indoor unit ADDRESS
Rotary switch for MCU ADDRESS
How to set up
Set the rotary switch located at outdoor unit PCB to match the number of connected indoor units (8).
 Set the rotary switch located at outdoor unit PCB to match the number of connected MCU (2).
 When installing more than 2 MCUs, set each rotary switch of MCU differently.
 Set rotary switch located at MCU PCB to match indoor unit address.
 Set the DIP switch of MCU to “OFF” position for the indoor units that is not connected.

MCU PCB
MCU address


Setting the
number of
Indoor Unit
Setting the
number of
MCU

Outdoor Unit
PCB

MCU address
 Indoor unit address
Indoor unit
MCU PCB


Indoor unit address
Indoor unit
• Connect the power cable using the compressed ring terminal.
Indoor unit
MCU
Indoor unit
Indoor unit
MCU
Indoor unit
MCU
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
MCU
Indoor unit
Indoor unit
• Communication cables are connected as shown above when installing MCU.
• When installing electricity and wires of MCU, please proceed the work refering to the installation manual of the
HR outdoor unit.
21
Wiring works
Key operation
Display MCU
status
K1
(Pushed time)
EEV valve
passive control
Display Contents
1
1
MCU address
0
2
3
4
5
6
7
8
Mode switching EEV1 step
Mode switching EEV2 step
Mode switching EEV3 step
Mode switching EEV4 step
Mode switching EEV5 step
Mode switching EEV6 step
Subcooler EEV step
1
2
3
4
5
6
7
9
Subcooler-in sensor temperature
8
10
Subcooler-out sensor temperature
9
11
12
13
14
15
16
On/Off for solenoid valve A_C, A_H
On/Off for solenoid valve B_C, B_H
On/Off for solenoid valve C_C, C_H
On/Off for solenoid valve D_C, D_H
On/Off for solenoid valve E_C, E_H
On/Off for solenoid valve F_C, F_H
A
B
C
D
E
F
17
On/Off for liquid by pass solenoid valve
G
18
19
Version
End of K1 display
8
K2
(Pushed time)
1
2
3
4
5
6
7
22
Display indoor
unit's address
Display segment
2
3
Blank 0
Blank 0
Blank 0
Blank 1
Blank 1
4
8
4
8
4
8
4
8
4
8
4
8
4
8
0
Blank 1
0
Blank 1
-
Blank
0
A
Display Contents
Indoor unit main address for matching with port A
Indoor unit main address for matching with port B
Indoor unit main address for matching with port C
Indoor unit main address for matching with port D
Indoor unit main address for matching with port E
Indoor unit main address for matching with port F
End of K2 display
4
0
1
2
1
5
0
0
0
0
0
0
0
1
0
1
0
Remarks
MCU address 0
MCU address 1
MCU address 2
MCU address 11
MCU address 15
Ex) 480 steps
Ex) 480 steps
Ex) 480 steps
Ex) 480 steps
Ex) 480 steps
Ex) 480 steps
Ex) 480 steps
Ex) -1°C
Ex) 10°C
Ex) -1°C
Ex) 10°C
• ✴_C : Cooling solenid valve of port ✴
• ✴_H : Heating solenid valve of port ✴
• 3rd segment : Cooling solenid valve On : 1 / Off : 0
0
F
2
N
F
0
Display segment
1 2 3 4
A - 0 0
B - 0 3
C - 0 6
D - 0 9
E - 1 1
F - 1 5
Ex) On
Ex) Off
Ex) October 20, 2008  8A 20
Remarks
Indoor unit main address of port A : 0
Indoor unit main address of port B : 3
Indoor unit main address of port C : 6
Indoor unit main address of port D : 9
Indoor unit main address of port E : 11
Indoor unit main address of port F : 15
K4 Switch (Electronic Valve Manual Control)
According to the push time of K4 Switch, A_C, A_H, …, F_C, F_H, Liquid bypass solenoid valve opens in order.
In Electronic Valve Manual Control mode, valve operates by K4 Push time irrespective of indoor operation mode.
In Electronic Valve Manual Control mode, push K1 Switch makes DATA DISPLAY MODE to start and valves will operate
following indoor operation mode.
K4
(Push time)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Display Contents
A_C sol valve ON, other sol valve Off
A_H sol valve ON, other sol valve Off
B_C sol valve ON, other sol valve Off
B_H sol valve ON, other sol valve Off
C_C sol valve ON, other sol valve Off
C_H sol valve ON, other sol valve Off
D_C sol valve ON, other sol valve Off
D_H sol valve ON, other sol valve Off
E_C sol valve ON, other sol valve Off
E_H sol valve ON, other sol valve Off
F_C sol valve ON, other sol valve Off
F_H sol valve ON, other sol valve Off
Liquid b/p sol valve ON, other sol valve Off
sol valve Manual Control MODE end
1
P
P
P
P
P
P
P
P
P
P
P
P
P
P
Display segment
2
3
4
A
1
0
A
0
1
B
1
0
B
0
1
C
1
0
C
0
1
D
1
0
D
0
1
E
1
0
E
0
1
F
1
0
F
0
1
S
0
1
Communication DATA Display
Commisioning
❈
After installing MCU, check those items below. If you find something unfulfilled, refer to the manual to complete it.
Item
Check
1. If the gas leaking test has been completed or not.
2. If MCU has been fixed securely enough to avoid the danger of vibration and falling or not.
3. The Insulation condition of the pipe. (Refrigerant pipe, Pipe connection.)
4.If the R410A refrigerant has been charged or not.
If the subsidiary unit for R410A has been used or not.
5. Checking malfunction of the wire and the communication line.
6. If the MCU frame has been installed upside-down or not.
7. If the wire earthing work has been done or not.
8.If the space between sidewalls, ceiling concrete, and the ceiling Tex has been secured enough or
not to install the MCU frame.
9. If the supporting tool of the MCU pipe has been safely placed in 1.5m intervals or not.
10. If the prescribed wire has been used or not.
11. If the supplied power is proper or not.
12.If the additional refrigerant is proper or not.
(Refer to the installation manual of the HR outdoor unit.)
23