Samsung MCU-Y6NEE User manual

MCU-Y6NEE
MCU-Y4NEE
MCU-Y4NEE1
DB98-33933A(2)
E
MCU
installation manual
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2
Safety precautions ................................................................................................................................................................................................................. 3
Preparing the installation ................................................................................................................................................................................................... 5
Space requirements .............................................................................................................................................................................................................. 7
Installing the unit ................................................................................................................................................................................................................... 8
Refrigerant piping works ................................................................................................................................................................................................. 11
Wiring works .......................................................................................................................................................................................................................... 17
Commisioning ...................................................................................................................................................................................................................... 23
Contents
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3
Safety precautions
The safety information and precautions below must be kept for the safety of users and installers.
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 specied 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 xing 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 o all the power supply before installing, xing, 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 qualication.
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.
Before installing an air conditioner, please read this manual thoroughly to ensure that you know how to safely and
eciently install a new appliance.
DVM PLUS IV air conditioner uses R410A refrigerant.
- When using R410A, moisture or foreign substances may aect 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 lling refrigerant.
If you charge gaseous refrigerant, it may aect 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.)
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4
FOR INSTALLATION
WARNING
Make sure to connect wires thoroughly and x them rmly 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 are 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 qualied 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 inammable materials like thinner or gasoline is
handled.The place where a carbon ber or inammable dust is oating 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.)
Safety precautions
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5
Preparing the installation
Please check if items below are included in installation accessories.
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.
Name Y-connector(Φ9.52,Φ15.88) Pipe socket Drain socket
Shape
Name Insulation (for pipe)
Insulation (for base)
Installation manual Pattern sheet Cable tie
Shape
Outer diameter [mm] Minimum thickness [mm] Material
ø6.35 0.7
C1220T-O
ø9.52 0.7
ø12.70 0.8
ø15.88 1.0
ø19.05 0.9
C1220T-1/2H
or
C1220T-H
ø22.23 0.9
ø25.40 1.0
ø28.58 1.1
ø31.75 1.1
ø38.10 1.35
ø44.45 1.6
ø50.80 2.0
Accessories
• Make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.
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6
Preparing the installation
MCU indoor/outdoor unit compatible table
Before installing MCU, refer to the compatible table below and nd the model before installation.
Gas pipe connected to indoor unit
Liquid pipe connected to indoor unit
<Side view of MCU>
Outdoor Unit
RD✴✴✴HRXGA✴
MCU
MCU-Y6NEE
MCU-Y4NEE
MCU-Y4NEE1
Indoor Unit
AVXC✴✴✴✴✴✴✴
AVXW✴✴✴✴✴✴✴
AVXT✴✴✴✴✴✴✴
AVXD✴✴✴✴✴✴✴
ND200/220/280 ✴✴✴✴✴✴✴
MCU Kit
Model Description
MCU-Y6NEE Below 6 indoor units, below 46.4kW
MCU-Y4NEE Below 4 indoor units, below 46.4kW
MCU-Y4NEE1 Below 2 large capacity ducts, below 46.4kW
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7
Space requirements
<There is no risk of noise transfer> <There is a risk of noise transfer>
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 oces 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.
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 gure)

Soundproof and soundproong materials
 
The place where MCU is installed and the interior walls should have a high soundproof ability.
(Bricks, Concretes, Cement)
 
The ceiling where MCU is installed should be coated with quality Tex that has a good soundproof function.
 
Minimize the size of the hole between the walls and the pipe connection. After the installation, block the gap to prevent
noise from leaking.
Living area Living areaLiving area
Bulkhead
Living areaHallway
MCU MCU
Hallway
<Spaces with developed ceiling> <Ceiling of the oce>
4. Secure over 0.25m of space when MCU is being xed 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 rmly.
If the pipe or the hanger isn’t xed rmly, the unit may fall and cause a property damage or loss of life.
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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.)
8. Select a place with enough space for repairing and services.
(Leave enough space between sidewalls in installation.-refer to the picture below)
Ceiling tex
Ceiling concrete
MCU
1.5m or less 1.5m or less
Pipe hanger
Refrigerant pipe
DonotinstalltheMCUtoclosetotheceilingTex(minimum50mm)
0.25m or more
MCU
400mm or more
700mm or more
400mm or
more
500mm or
more
1. MCU specication
Model MCU-Y6NEE MCU-Y4NEE MCU-Y4NEE1
The exterior of MCU
Number of connectable indoor
units Up to 6 units Up to 4 units
Up to 2 units
Onlyforlargecapacityduct
(20.0kW)
Themaximumcapacityofthe
connectable indoor units
44.8kW 44.8kW 44.8kW
Internal EEV Not included
Cannot connect indoor unit without internal EEV.
Installing the unit
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9
2. Installing the indoor unis
Model MCU-Y6NEE MCU-Y4NEE MCU-Y4NEE1
Example
installing
Installing
indoor
units
Under10.0kWindoorunit:Don'tuseY-connector
11.2kW~14.0kWindoorunit:UseY-connectorattheGas&LiquidLine
❈Cannotconnecttolargecapacityduct(20.0kWOver)
Largecapacityductunit:Use
Y-connectorattheGas&LiquidLine
❈Onlyfor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.
• Since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.
2) Insertboltanchors,useexistingceilingsupportsorconstructasuitablesupport
as shown in gure.
Concrete
Hole in anchor
Hole in plug
Suspensionbolt(3/8"orM10)
Insert
3) Installthesuspensionboltsdependingontheceilingtype.
Ceiling support
• Ensure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.
4. Cautions about MCU installation.
  Whenxingtheunitattheupperplaceusingsuspensionbolts,useanutandwashertoverticallyfastentheunit.
  Therearefourspotstoxthesuspensionbolts.Makesureeveryspotisxed.
  The upper and the lower side of MCU is distinguished, so be careful not to turn the unit upside down when installing the
unit.Otherwise,noisemaybegeneratedortheproductmaybedamaged.
Nut
Washer
Antivibration
rubber
Fastenthenutrmly
764(Betweenthelocationsofsuspensionbolts)
224 224
(Unit:mm)
<Location and intervals of xed suspension bolts> <Fixing the bolt>
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Installing the unit
5. How to connect the pipe line.
Low pressure gas pipe connection (Brazing)
High pressure gas pipe connection (Brazing)
Liquid pipe connection (Flare)
Pipe connection from outdoor unit
Pipe connection to indoor unit
Gas pipe (Flare)Liquid pipe(Flare)

When 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 ame-proof sheet.
Protect with
wet towel when
brazing
6. How to connet Y-connector
  In case of connecting one indoor withY-Connector to MCU, Y-Connector must be connected in series.
<Good Example of connection> <No Good Example of connection>
Indoor #1 Indoor #2
70mm
70mm
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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 ow 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)
Method Branch with Y-joint
Using MCU
only
Using Y- joint
and MCU
Refrigerant pipe installation
Items Examples Remarks
Max.
piping
length
Outdoor ~
Outdoor unit
Piping
(Equivalent
piping)
200m below
(220m below)
Using MCU only a+b+c+d+e+f+g ≤ 200 m (220m) Equivalent pipe
length.
Y joint : 0.5m,
Header : 1m,
MCU : 1m
UsingY-joint and MCU a+g+m ≤200 m (220 m)
Total
piping 1000m below
Using MCU only a+b+c+d+e+f+g ≤1000 m
UsingY-joint and MCU a+b+c+d+e+f+g+p+h+i+j+k+m+n
≤1000 m
Piping 10 m below r ≤10, s ≤10, t ≤10 m
Equivalent
piping 13 m below r ≤13, s ≤13, t ≤13 m
Level
dierence
Outdoor ~
Indoor unit Piping 50 m / 40 m*1) H1 ≤50/40 m
Indoor ~
Indoor unit Piping 15m below H2 ≤15 m
Outdoor ~
Outdoor unit Piping 5m below H3 ≤5 m
MCU~MCU Piping 15m below H4 ≤15 m
Allowable
length
after
branch
The rst branch ~
the farthest
Indoor unit
Piping 45 m below
Using MCU only 45 m
UsingY-joint and MCU g+m ≤45 m
*1) As an outdoor unit is located in a lower position than indoor unit, level dierence is 40m.
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Outdoor unit connection pipe size : (A1), (A2), (A3) Branch joint : (D), (E), (F)
A1:Selectthepipesaccordingtotheoutdoorunit
capacitywithfollowingtable.
A2:Selectthepipesaccordingtosumofoutdoor
unitcapacitiesbehindtheoutdoorjointwith
following table.
A3:Selectthemainpipeofoutdoorunitswiththe
following table.
*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.
Pipe size between branch joints and indoor
unit : (C)
Select the pipe size according to the indoor
unit’s capacity.
Selecting the refrigerant pipe
Whenselectingtherefrigerantpipe,refertothetablebelow.(TheamountofadditionalMCUrefrigerant:0.5Kg)
Refrigerant piping works
12HP 14HP
Outdoor
unit
Pipe size (O.D. mm), (A) Oil
balancing
pipe size
Liquid Gas High gas
8HP Ø9.52 Ø19.05 Ø15.88
Ø6.35
10HP Ø22.23 Ø19.05
12HP
Ø12.70 Ø25.40 Ø22.2314HP
16HP
Ø28.58
18HP
Ø15.88 Ø25.40
20HP
22HP
24HP
26~30HP
Ø19.05 Ø31.75 Ø28.58 32~34HP
36~48HP Ø38.10 Ø31.75
50~60HP Ø22.23 Ø44.45 Ø38.10
■Branch joint of outdoor unit’s multi
connection (D)
Model Capacity of
outdoor
Liquid & Low
gas pipe
MXJ-T3819 ✴
Below 48 HP
MXJ-T4422 ✴
Above50HP
High gas pipe MXJ-T3100
✴
Below 48 HP
MXJ-T3800 ✴
Above50HP
Indoor unit’s capacity Pipe size (O. D. mm)
Liquid pipe Gas pipe
2.2~5.6kW Ø6.35 Ø12.70
7.1~14.0kW Ø9.52 Ø15.88
16HP
Total indoor unit’s
capacity
Pipe size (O.D. mm)
Liquid Gas High gas
15.0kWandbelow
Ø9.52
Ø15.88 Ø15.88
Over15.0~23.2kWandbelow Ø19.05
Over23.2~29.0kWandbelow Ø22.23 Ø19.05
Over29.0~40.6kWandbelow
Ø12.70 Ø25.40 Ø22.23
Over40.6~46.4kWandbelow
Ø28.58
Over46.4~69.6kWandbelow Ø15.88 Ø25.40
Over69.6~98.6kWandbelow
Ø19.05 Ø31.75 Ø28.58
Over98.6~139.2kWandbelow Ø38.10 Ø31.75
Over139.2kW Ø22.23 Ø44.45 Ø38.10
■First branch joint (E)
Selectbranchjointaccordingtooutdoor
unit’scapacity.
Liquid
& Low
pressure
gas
Y-joint (E)
Outdoor unit Model
8~14HP MXJ-YA2512
✴
16 HP MXJ-YA2812
✴
18~24HP MXJ-YA2815
✴
26~34HP MXJ-YA3119
✴
36~48HP MXJ-YA3819
✴
50~60HP MXJ-YA4422
✴
High
pressure
gas
Y-joint (E)
Outdoor unit Model
8 HP MXJ-YA1500
✴
10~24HP MXJ-YA2500
✴
26~48HP MXJ-YA3100
✴
50~60HP MXJ-YA3800
✴
■Branch joint (F)
Liquid
& low
pressure
gas
Y-joint
(F)
Model Total indoor unit’s capacity
MXJ-YA1509 ✴
15.0kWandbelow
MXJ-YA2512 ✴
Over15.0~40.6kWandbelow
MXJ-YA2812 ✴
Over40.6~46.4kWandbelow
MXJ-YA2815 ✴
Over46.4~69.6kWandbelow
MXJ-YA3119 ✴
Over69.6~98.6kWandbelow
MXJ-YA3819 ✴
Over98.6~139.2kWandbelow
MXJ-YA4422 ✴
Over139.2kW
High
pressure
gas
Y-joint
(F)
Model Total indoor unit’s capacity
MXJ-YA1500 ✴
23.2kWandbelow
MXJ-YA2500 ✴
Over23.2~69.6kWandbelow
MXJ-YA3100 ✴
Over69.6~139.2kWandbelow
MXJ-YA3800 ✴
Over139.2kW
(C)
(F)
(D)
(A3)(A2)(A1)
•Example)42HPofcompact
combinations
HP Mark Pipe size (O. D.mm)
Liquid Low gas High gas
12 (A1) Ø12.70 Ø25.40 Ø22.23
14 (A1) Ø12.70 Ø25.40 Ø22.23
16 (A1) Ø12.70 Ø28.58 Ø22.23
26 (A2) Ø19.05 Ø31.75 Ø28.58
42 (A3) Ø19.05 Ø38.10 Ø31.75
(A1)
(A1) (E)
(B)
• ThesumofthetotalcapacityoftheindoorunitsconnectedtoaMCUshouldnotbeoverthemax.44.8kW.
MCU-Y6NEE_IM_E 33933A(2).indd 12 2011-07-15 오전 10:31:19

13
• Total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.
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 0.02
Ø9.52 0.06
Ø12.70 0.125
Ø15.88 0.18
Ø19.05 0.27
Ø22.23 0.35
Ø25.40 0.53
Ø12.70(1m)
Ø12.70(5m)
Ø19.05(10m)
MCU
Ø9.52
(15m)
Ø9.52
(10m)
MCU
Ø9.52(25m)
Ø9.52(15m)
Ø9.52(18m)
Ø15.88(10m)Ø15.88(10m)
Ø6.35(15m)
Ø9.52
(25m)
61.6kW
11.2kW
2.8kW
11.2kW
7.1kW 7.1kW
7.1kW
7.1kW
7.1kW
Ø6.35(2m)
Ø6.35(10m)
Additional refrigerant charging of MCU kit (kg/unit)
Additional refrigerant charging of MCU is 0.5kg for every
MCU kit 0.5
Additional refrigerant charging of distribution kit (kg/m) Remarks
Regardless of the liquid pipe size, additional refrigerant
charging is 0.01kg per meter after distribution kit 0.01 For wall-mounted & ceiling indoor unit
 The amount of the refrigerant that is already placed in
Classication 8HP 10HP 12HP 14HP 16HP 18HP 20HP
Standard 5.0 5.0 5.0 7.0 7.0 8.5 8.5
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
(O.D. mm) Ø6.35 Ø9.52 Ø12.70 Ø15.88 Ø19.05
Length (m) 25 101 6 20 10
MCU Pipe length after
distribution kit (m)
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.
MCU-Y6NEE_IM_E 33933A(1).indd 13 2011-06-28 오후 5:48:43

14
Refrigerant piping works
Method and cautions on 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 ow rate of the nitrogen gas with a pressure regulator to
maintain 0.05m3/h or less.
Direction of the pipe when brazing
• Performingthebrazingofthepipeshouldbeheadeddownwardsor
horizontally.
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.
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.
Exposure place Exposure time Sealing type
Outside exposure Longer than one month Pipe pinch
Shorter than one month Taping
Inside exposure - Taping
Brazing part
Nitrogen gas
1/4" copper pipe
Stop valve
Taping
Pressure regulator
Flowmeter
Insulation cover pipe
Indoor
unit
Be sure to overlap
the insulation
Insulation pipe
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.
1. To avoid condensation problems, place T13.0 or thicker Acrylonitrile Butadien
Rubber separately around each refrigerant pipe.
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 xed to the wall with suitable ducts.
No gap
NBR(T13.0 or thicker)
• Alwaysmaketheseamofpipesfaceupwards.
• Allrefrigerantconnectionmustbeaccessible,inordertopermit
either unit maintenance or removing it completely. • Mustttightlyagainst
body without any gap.
MCU-Y6NEE_IM_E 33933A(1).indd 14 2011-06-28 오후 5:48:43

15
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.
 
Indoortemperatureof 30°Cand humidity of 85% is thestandardcondition. Ifinstallin a highhumiditycondition, use onegradethicker
insulatorby referringto thetable below. Ifinstallinginanunfavorableconditions,use thickerone.
  Insulator’s heat-resistance temperature should be more than 120°C.
Pipe Pipe size
Insulation Type(Heating/Cooling)
Remarks
Standard
[30 °C , 85% ]
High humidity
[30 °C , over85% ]
EPDM, NBR
Liquid
pipe
ø
6.35~
ø
9.52 9t 9t
Internal temperature
is higher than 120 °C
ø
12.70~
ø
50.80 13t 13t
Gas
Pipe
ø
6.35 13t 19t
ø
9.52
19t
25t
ø
12.70
ø
15.88
ø
19.05
ø
22.23
ø
25.40
ø
28.58
32t
ø
31.75
ø
38.10
ø
44.45
ø
50.80 25t 38t
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.
Gas pipe
Liquid pipe
Insulation
Insulation
Gas pipe
10mm
Liquid pipe
10mm
10mm
10mm
• Install 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.
• 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
Hanger
Refrigerant pipe insulation
a×3
a
MCU-Y6NEE_IM_E 33933A(1).indd 15 2011-06-28 오후 5:48:45

16
Refrigerant piping works
Draining form
Flexible hose
Air vent
300mm or less
Horizontal drainpipe
more than 1/100 slope
Within
300~550mm
1~1.5m
200mm
or more
Ceiling
Hanger
20mm
or more
Without the drain pump
With the drain pump
1. Install horizontal drainpipe with a slope of 1/100 or more and x 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 ow back to the unit.
1. The drain pipe should be installed within 300mm to 550mm from the exible hose and then lift down 20mm or more.
2. Install horizontal drainpipe with a slope of 1/100 or more and x it by hanger space of 1.0~1.5m.
3. Install the air vent in the horizontal drainpipe to prevent water ow back to the indoor unit.
4. The exible hose should not be installed upward position, it may cause water ow back to the indoor unit.
1~1.5m
Horizontal drainpipe
more than 1/100 slope
Ceiling
Hanger
Flexible hose
• Youmaynotneedtoinstallitiftherewereproperslopeinthehorizontaldrainpipe.
MCU-Y6NEE_IM_E 33933A(1).indd 16 2011-06-28 오후 5:48:47

17
Installing the circuit breaker and wires
Wiring works
Power supply MCCB ELB Power cable Earth cable Communication cable
Max : 242V
Min : 198V XAXA, 30mmA 0.1 sec 2.5mm22.5mm20.75~1.5mm2
The capacity of ELB, MCCB X[A] = 1.25 X 1.1 X ∑Ai
Decide the capacity of ELB and MCCB by below formula.
Decide the power cable specication and maximum length within 10% power drop among indoor units.
❈
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.
❈Calculation
- Installing with 1 sort wire
❈If the terminal input pressure of the indoor unit goes down by more than 10%, install the thicker wire.
- Installing with 2 dierent sort wire
TCoef: 1.55
TLk: Distance among each indoor unit[m], Ak: Power cable specification[mm2]
ik: Running current of each unit[A]
∑( Coef×35.6×Lk×ik
) < 10% of input voltage[V]
1000×Ak
n
k=1
10[A]
Indoor unit10
20[m]10[m]0[m]
9[A] 1[A]
100[m]
MCCB
Indoor unit2Indoor unit1
ELB
Example of Installation
Total power cable length L = 100(m), Running current of each units 1[A]
Total 10 indoor units were installed
Apply following equation.
220[V]
-2.2[V] -2.0[V]
············ 2.5[mm2] ············
208.8[V](Within 198V~242V)
-(2.2+2.0+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-11.2[V]
it's okay
2.5[mm2] 2.5[mm2]
220[V] -1.4[V] -1.2[V]
············ 2.5[mm2] ············
209.5[V](Within 198V~242V)
-(1.4+1.2+1.8+1.5+1.3+1.1+0.9+0.7+0.4+0.2)=-10.5[V]
it's okay
4.0[mm2] 4.0[mm2]
∑( Coef×35.6×Lk×ik ) < 10% of input voltage[V]
1000×Ak
n
k=1
MCU-Y6NEE_IM_E 33933A(1).indd 17 2011-06-28 오후 5:48:48

18
Wiring works
Rated current
Unit Model Rating current (A)
AVXCS✴✴
✴✴022✴✴
✴✴028✴✴
✴✴036✴✴
0.20
0.23
0.25
AVXC2✴✴
✴✴052✴✴
✴✴056✴✴
✴✴060✴✴
✴✴071✴✴
✴✴072✴✴
0.38
0.38
0.40
0.40
0.40
ND✴✴✴4✴✴✴
✴✴045✴✴
✴✴056✴✴
✴✴071✴✴
✴✴090✴✴
✴✴112✴✴
✴✴128✴✴
✴✴140✴✴
0.15
0.15
0.21
0.30
0.36
0.36
0.45
AVXCM✴✴
✴✴028✴✴
✴✴036✴✴
✴✴056✴✴
✴✴071✴✴
0.50
0.50
0.52
0.55
AVXWV✴✴
✴✴022✴✴
✴✴028✴✴
✴✴036✴✴
✴✴056✴✴
✴✴071✴✴
0.13
0.18
0.19
0.30
0.30
AVXDS✴A
✴✴022✴✴
✴✴028✴✴
✴✴036✴✴
✴✴040✴✴
✴✴045✴✴
✴✴056✴✴
✴✴071✴✴
✴✴090✴✴
✴✴112✴✴
✴✴128✴✴
✴✴140✴✴
0.40
0.40
0.40
0.60
0.60
0.60
0.60
1.00
1.00
1.20
1.20
AVXDS✴P
✴✴071✴✴
✴✴090✴✴
✴✴112✴✴
✴✴128✴✴
✴✴140✴✴
0.96
0.96
0.96
1.13
1.24
AVXDU✴✴
✴✴056✴✴
✴✴071✴✴
✴✴090✴✴
✴✴112✴✴
✴✴128✴✴
✴✴140✴✴
1.10
1.25
1.30
1.17
1.62
1.86
ND✴✴✴HH✴✴✴
✴✴200✴✴
✴✴220✴✴
✴✴280✴✴
3.30
3.80
5.90
MCU-Y6NEE_IM_E 33933A(1).indd 18 2011-06-28 오후 5:48:48

19
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.
Input socket
Choose the compressed socket based on the cross-section of the connecting wire.
Case 1
Indoor
Unit
Indoor
Unit
Outdoor
Unit
ELB
MCCB
220-240V
(Supply separately)
Case 2
Indoor
Unit
Indoor
Unit
Outdoor
Unit
ELB
MCCB
220-240V
(Supply separately)
Silver solder
Norminal
dimensions for
cable (mm2)
Norminal
dimensions for
screw (mm)
B D d1 E F L d2 t
Standard
dimension
(mm)
Allowance
(mm)
Standard
dimension
(mm)
Allowance
(mm)
Standard
dimension
(mm)
Allowance
(mm) Min. Min. Max.
Standard
dimension
(mm)
Allowance
(mm) Min.
1.5 4 6.6 ±0.2 3.4 +0.3
-0.2 1.7 ±0.2 4.1 6 16 4.3 +0.2 00.7
4 8
2.5 4 6.6 ±0.2 4.2 +0.3
-0.2 2.3 ±0.2 6 6 17.5 4.3 +0.2 00.8
4 8.5
4 4 9.5 ±0.2 5.6 +0.3
-0.2 3.4 ±0.2 6 5 20 4.3 +0.2 00.9
MCU-Y6NEE_IM_E 33933A(1).indd 19 2011-06-28 오후 5:48:49

20
Setting address and option
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.
PCB Layout
Turn o 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 MCU ADDRESSRotary switch for indoor unit 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.
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Indoor UnitIndoor Unit
MCU PCB MCU PCB
MCU PCBY-connector installation
Setting the
number of
Indoor Unit
Setting the
number of
MCU
Indoor Unit ADDRESS
Outdoor Unit PCB
MCU ADDRESS MCU ADDRESS
Indoor Unit ADDRESS
MCU DIP S/W MCU DIP S/W
Wiring works
MCU DIP S/W
Indoor Unit ADDRESS
Indoor #1
Indoor #2
MCU-Y6NEE_IM_E 33933A(1).indd 20 2011-06-28 오후 5:48:49