Mitsubishi Electric MXZ-6E120VAD2 User manual

Split-type Air-Conditioner
MXZ-6E120VAD2
English
Installation Manual For INSTALLER
• This manual only describes the installation of outdoor unit.
When installing the indoor unit, refer to the installation manual of indoor unit.

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1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
• Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.
• Besuretoobservethewarningsandcautionsspeciedhereastheyincludeimportantitemsrelatedtosafety.
• After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.
• Equipment complying with IEC/EN 61000-3-12.
1-2. SPECIFICATIONS
Model
Power supply *1 Wirespecications*2 Pipe length and height difference
*3, *4, *5, *6, *7, *8
Rated
Voltage Fre- quency Breaker capacity Power supply Indoor/outdoor connecting wire
Max. pipe
length per
indoor unit / for
multi-system
Max. height
difference *9
Max. no. of bends
per indoor unit /
for multi system
Refrigerant
adjustment
A *10
MXZ-6E120VAD2 230 V 50 Hz 32 A 3-core
4.0 mm24-core
1.0 / 1.5 mm225 m / 80 m 15 m 25 / 80 20 g/m
*1 Connect to the power switch which has a gap of 3 mm or more when open
to interrupt the source power phase. (When the power switch is shut off, it
must interrupt all phases.)
*2 Use wires in conformity with design 60245 IEC 57. Use the indoor/outdoor
connectingwireinconformitywiththewirespecicationsspeciedinthe
installation manual of the indoor unit.
*3 Neverusepipeswiththicknesslessthanspecied.Thepressureresistance
willbeinsufcient.
*4 Use a copper pipe or a copper-alloy seamless pipe.
*5 Be careful not to crush or bend the pipe during pipe bending.
*6 Refrigerant pipe bending radius must be 100 mm or more.
*7 Insulationmaterial:Heatresistingfoamplastic0.045specicgravity
*8 Besuretousetheinsulationofspeciedthickness.Excessivethickness
maycauseincorrectinstallationoftheindoorunitandinsufcientthickness
may cause dew drippage.
* 9 If the outdoor unit is installed higher than the indoor unit, max. height
difference is reduced to 10 m.
* 10 If pipe length exceeds 30 m, additional refrigerant (R410A) charge is re-
quired. (No additional charge is required for pipe length less than 30 m.)
Additional refrigerant = A × (pipe length (m) - 30)
Required Tools for Installation
Phillips screwdriver
Level
Scale
Utility knife or scissors
Torque wrench
Wrench (or spanner)
4 mm hexagonal wrench
Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
ENGLISH
CONTENTS
1. BEFORE INSTALLATION ............................................................1
2. OUTDOOR UNIT INSTALLATION ...............................................4
3. FLARING WORK AND PIPE CONNECTION...............................5
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN.........5
5. PUMPING DOWN........................................................................7
CAUTION (Could lead to serious injury in particular environments when operated incorrectly.)
nDo not install the unit by yourself (user).
 Incompleteinstallationcouldcausereorelectricshock,injuryduetotheunit
falling, or leakage of water. Consult the dealer from whom you purchased
theunitoraqualiedinstaller.
nPerform the installation securely referring to the installation manual.
 Incompleteinstallation couldcausere,electric shock,injurydueto the
unit falling, or leakage of water.
nWhen installing the unit, use appropriate protective equipment and
tools for safety.
Failure to do so could cause injury.
nInstall the unit securely in a place which can bear the weight of the
unit.
If the installation location cannot bear the weight of the unit, the unit could
fall causing injury.
n Electrical work should be performed by a qualied, experienced electri-
cian, according to the installation manual. Be sure to use an exclusive
circuit. Do not connect other electrical appliances to the circuit.
 If the capacity of the power circuit is insufcient or there is incomplete
electricalwork,itcouldresultinareoranelectricshock.
n Do not damage the wires by applying excessive pressure with parts
or screws.
 Damagedwirescouldcausereorelectricshock.
n Be sure to cut off the main power in case of setting up the indoor P.C.
board or wiring works.
Failure to do so could cause electric shock.
n Use the specied wires to connect the indoor and outdoor units
securely and attach the wires rmly to the terminal block connecting
sections so the stress of the wires is not applied to the sections. Do
not extend the wires, or use intermediate connection.
 Incompleteconnectingandsecuringcouldcausere.
n Do not install the unit in a place where inammable gas may leak.
If gas leaks and accumulates in the area around the unit, it could cause an
explosion.
n Do not use intermediate connection of the power cord or the extension
cord and do not connect many devices to one AC outlet.
 Itcouldcauseareoranelectricshockduetodefectivecontact,defective
insulation, exceeding the permissible current, etc.
n Be sure to use the parts provided or specied parts for the installation
work.
The use of defective parts could cause an injury or leakage of water due
toare,anelectricshock,theunitfalling,etc.
n When plugging the power supply plug into the outlet, make sure that
there is no dust, clogging, or loose parts in both the outlet and the
plug. Make sure that the power supply plug is pushed completely into
the outlet.
If there is dust, clogging, or loose parts on the power supply plug or the
outlet,itcouldcauseelectricshockorre.Ifloosepartsarefoundonthe
power supply plug, replace it.
n Attach the electrical cover to the indoor unit and the service panel
to the outdoor unit securely.
If the electrical cover of the indoor unit and/or the service panel of the
outdoorunitarenotattachedsecurely,itcouldresultinareoranelectric
shock due to dust, water, etc.
n When installing, relocating, or servicing the unit, make sure that no
substance other than the specied refrigerant (R410A) enters the
refrigerant circuit.
Anypresence offoreign substancesuch asair cancause abnormalpres-
sure rise and may result in explosion or injury. The use of any refrigerant
otherthan that specied forthe system will causemechanical failure,
system malfunction, or unit breakdown. In the worst case, this could lead
to a serious impediment to securing product safety.
n Do not discharge the refrigerant into the atmosphere. If refrigerant
leaks during installation, ventilate the room.
 Ifrefrigerantcomesincontactwithare,harmfulgascouldbegenerated.
n Check that the refrigerant gas does not leak after installation has
been completed.
Ifrefrigerantgasleaksindoors,andcomesintocontactwiththeameofa
fan heater, space heater, stove, etc., harmful substances will be generated.
n Use appropriate tools and piping materials for installation.
Thepressure ofR410A is 1.6 times morethan R22.Not usingappropriate
tools or materials and incomplete installation could cause the pipes to
burst or injury.
n When pumping down the refrigerant, stop the compressor before
disconnecting the refrigerant pipes.
If the refrigerant pipes are disconnected while the compressor is running
and the stop valve is open, air could be drawn in and the pressure in the
refrigeration cycle could become abnormally high. This could cause the
pipes to burst or injury.
n When installing the unit, securely connect the refrigerant pipes
before starting the compressor.
If the compressor is started before the refrigerant pipes are connected
and when the stop valve is open, air could be drawn in and the pressure
inthe refrigerationcycle could becomeabnormally high.This couldcause
the pipes to burst or injury.
n Fasten a are nut with a torque wrench as specied in this manual.
 Iffastenedtootight,aarenutmaybreakafteralongperiodandcause
refrigerant leakage.
n The unit shall be installed in accordance with national wiring regula-
tions.
nEarth the unit correctly.
Do not connect the earth to a gas pipe, water pipe, lightning rod or tel-
ephone earth. Defective earthing could cause electric shock.
nBe sure to install an earth leakage breaker.
Failuretoinstallanearthleakagebreakermayresultinelectricshockorre.
nPerform the drainage/pipingwork securely according tothe installation
manual.
Ifthere isdefect inthe drainage/pipingwork, water could drop fromthe unit,
soaking and damaging household goods.
n Do not touch the air inlet or the aluminum ns of the outdoor unit.
This could cause injury.
nDo not install the outdoor unit where small animals may live.
If small animals enter and touch the electric parts inside the unit, it could
causeamalfunction,smokeemission,orre.Also,adviseusertokeep
the area around the unit clean.
WARNING (Could lead to death, serious injury, etc.)
1. BEFORE INSTALLATION

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1-3. SELECTING OPTIONAL DIFFERENT-DIAMETER JOINTS
If the diameter of connection pipe does not match the port size of outdoor unit, use optional different-diameter joints according to the following table.
Port size of outdoor unit Optional different-diameter joints (port size of outdoor unit →diameter of connection pipe)
MXZ-6E120 Liquid / Gas 6.35 (1/4) →9.52 (3/8) : PAC-493PI
9.52 (3/8) →12.7 (1/2) : MAC-A454JP-E
9.52 (3/8) →15.88 (5/8) : PAC-SG76RJ-E
12.7 (1/2) →9.52 (3/8) : MAC-A455JP-E
12.7 (1/2) →15.88 (5/8) : MAC-A456JP-E
Refer to the installation manual of indoor unit for the diameter of connection pipe of indoor unit.
A UNIT 6.35 (1/4) / 12.7 (1/2)
B - F UNIT 6.35 (1/4) / 9.52 (3/8)
1-4. SELECTING THE INSTALLATION LOCATION
• Where it is not exposed to strong wind.
• Whereairowisgoodanddustless.
• Where rain or direct sunshine can be avoided as much as possible.
• Where neighbours are not annoyed by operation sound or hot air.
• Where rigid wall or support is available to prevent the increase of opera-
tion sound or vibration.
• Where there is no risk of combustible gas leakage.
• When installing the unit, be sure to secure the unit legs.
• Where it is at least 3 m away from the antenna of TV set or radio. Opera-
tion of the air conditioner may interfere with radio or TV reception in areas
wherereceptionisweak.Anampliermayberequiredfortheaffected
device.
• Install the unit horizontally.
• Please install it in an area not affected by snowfall or blowing snow. In
areas with heavy snow, please install a canopy, a pedestal and/or some
bafeboards.
Note:
It is advisable to make a piping loop near outdoor unit so as to reduce
vibration transmitted from there.
Note:
When operating the air conditioner in low outside temperature, be sure
to follow the instructions described below.
• Never install the outdoor unit in a place where its air inlet/outlet side
may be exposed directly to wind.
• To prevent exposure to wind, install the outdoor unit with its air inlet
side facing the wall.
•
Topreventexposuretowind,itisrecommendedtoinstallabafeboard
on the air outlet side of the outdoor unit.
Avoid the following places for installation where air conditioner trouble
is liable to occur.
• Whereammablegascouldleak.
• Where there is much machine oil.
• Salty places such as the seaside.
• Wheresuldegasis generatedsuchashotspring, sewage,waste
water.
• Where there is high-frequency or wireless equipment.
• Where there is emission of high levels of VOCs, including phthalate
compounds, formaldehyde, etc., which may cause chemical cracking.
(Unit: mm (inch))
3. Obstacles in front (blowing) only
When there is an obstacle in front of
theunitasshowninthegure,open
spaceabove, behind,and onthe sides
of the unit is required.
2. Front (blowing) side open
As long as space indicated
in the figure is provided, it
is allowed to install the unit
where obstacles are behind
and on the sides of the unit.
(No obstacle above the unit)
FREE SPACE REQUIRED AROUND OUTDOOR UNIT
500 or more
200 or more
350 or more100 or more
1. Obstacles above
When there is no obstacle in front and
on the sides of the unit, it is allowed
to install the unit where an obstacle is
above the unit only if the space shown
inthegureisprovided.
100 or more
500 or more
100 or more
Service space
350 or more
350 or more
6. Service space
Providespaceforserviceandmaintenanceasshowninthegure.
500 or more
100 or more
• When installing the unit in an area that is enclosed with walls such
as a verandah, be sure to have enough space as shown below.
In this case, the air conditioning capacity and power consumption
might deteriorate.
• Whenthereisalackofairoworthereisapossibilityofbecoming
short cycle, install an outlet guide and make sure there is enough
space behind of the unit.
• When installing two or more units, do not install the units in front or
behind each other.
100 or more
200 or more
350 or more
500 or more 500 or more
(Unit: mm)
5. Obstacles in front, behind and on side(s)
4. Obstacles in front and behind
The unit can be used by at-
taching an optional outdoor
blowing guide (PAC-
SH96SG-E) (but both sides
and top are open).
100 or more
500 or more
Blowing guide (PAC-SH96SG-E)
Height of the obstacle is 1200 or less

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1-5. INSTALLATION DIAGRAM
Units should be installed by licensed contractor according to local code requirements.
After the leak test, apply insulat-
ing material tightly so that there
is no gap. ACCESSORIES
Check the following parts before installation.
(1) Drain socket 1
(2) Drain cap 5
PARTS TO BE PROVIDED AT YOUR SITE
(A) Power supply cord* 1
(B) Indoor/outdoor unit connecting wire* 1
(C) Extension pipe 1
(D) Wall hole cover 1
(E) Piping tape 1
(F) Extension drain hose (or soft PVC hose, 15 mm inner
diameter or hard PVC pipe VP16) 1
(G) Refrigeration oil Little
amount
(H) Putty 1
(I) Pipexingband 2 to 7
(J) Fixing screw for (I) 2 to 7
(K) Wall hole sleeve 1
(L) Soft PVC hose, 15 mm inner diameter or hard PVC pipe VP16
for drain socket (1) 1
* Note:
Place indoor/outdoor unit connecting wire (B) and
power supply cord (A) at least 1 m away from the
TV antenna wire.
The “Q’ty” for (B) to (K) in the above table is quantity
to be used per indoor unit.
More than
100 mm
Open as a rule
More than 500 mm
if the front and both
sides are open
More than 100 mm
More than 200 mm if there are
obstacles to both sides
Open as a rule
More than 500 mm if the back,
both sides and top are open
More than 350 mm
Outdoor unit installation
Air inlet
Air outlet
Air inlet
950 mm
600 mm
175
mm
2-U-shape notched holes
(Base bolt M10)
330 mm
2 - 12 mm × 36 mm
oval holes (Base bolt M10)
370 mm
417 mm
Whenthe pipingis to beattached to
a wall containing metals (tin plated)
or metal netting, use a chemically
treated wooden piece 20 mm or
thicker between the wall and the
pipingorwrap 7 to 8 turns ofinsula-
tion vinyl tape around the piping.
To use existing piping, perform
COOL operation for 30 minutes
and pump down before removing
theoldairconditioner.Remakeare
according to the dimension for new
refrigerant.
1-6. DRAIN PIPING FOR OUTDOOR UNIT
1) Perform the drain piping work only when draining from one place.
2) Provide drain piping before indoor and outdoor piping connection.
3) Attach the drain socket to one of the several drain holes.
Fix the drain socket into the drain hole of the base using the catches to secure it in
place.
4) Connect the soft PVC hose I.D.15 mm as shown in the illustration.
5) Makesuretoprovidedrainpipingwithadownhillgradeforeasydrainow.
6) Glue the drain caps to close all the other unnecessary holes with the glue (Prepare
intheeld).
Note:
Applythegluesecurely,astheglue(Prepareintheeld)willworkassealtoprevent
water from leaking.
Use the adhesive for the rubber and metal.
Attention
The outdoor unit is provided with several holes for drainage at the bottom to make
drainage easier.
The drain socket is used to close the unnecessary holes and centralize the drainage
when using the drain tube at the installation place.
Do not to use the drain socket in cold region. The drain tube can be frozen.
(1) Drain socket (L) Soft PVC hose
(2) Drain cap

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ABC
D E F
ABC
D E F
ABC
E F
ABC
D E F
ABC
D D E F
DRDRDRDRDR
P P P P P
2-1. INSTALLING THE UNIT
Fix here with
M10 bolts.
Make the setting
depth deeper. Make width wider.
Anchor leg
25 or less
Anchor bolt length Anchor bolt pitch
(Unit: mm)
2-2. CONNECTING WIRES FOR OUTDOOR UNIT Terminal block
for power supply
• Besuretoxtheunit’slegswithboltswheninstallingit.
• Besuretoinstalltheunitrmlytoensurethatitdoesnotfallbyanearthquakeoragust.
• Refertothegureintherightforconcretefoundation.
• Do not use the drain socket and the drain caps in the cold region.
Drain may freeze and it makes the fan stop.
• Remove the tape on the panel when opening the package. (DO NOT remove the LABELS on the panel.)
1) Remove the service panel.
2) Loosenterminal screw,and connectindoor/outdoor unitconnecting wire
(B) from the indoor unit correctly on the terminal block. Be careful not
to make mis-wiring. Fix the wire to the terminal block securely so that
no part of its core is appeared, and no external force is conveyed to the
connecting section of the terminal block.
3) Firmly tighten the terminal screws to prevent them from loosening. After
tightening,pullthewireslightlytoconrmthattheydonotmove.
4) Perform 2) and 3) for each indoor unit.
5) Connect power supply cord (A).
6) Fix indoor/outdoor unit connecting wire (B) and power supply cord (A)
with the cable clamps.
7) Close the service panel securely. Make sure that 3-2. PIPE CONNEC-
TION is completed.
• After making connections between both power supply cord (A) and
indoor/outdoorunitconnectingwire(B),besuretoxbothcableand
wire with cable clamps.
Connecting order
• Connect the terminal block in
following order.
A→B→C→D→E→F→P→DR
Terminal block for indoor/outdoor unit
Cable clamps
600
370
Service panel Screws
Note:
• Removing the handle increases the effectiveness of the wiring operation.
• Be sure to reinstall the handle.
2. OUTDOOR UNIT INSTALLATION
Terminal block
for DRED Interface
DRED Interface
Power supply
35 mm 15 mm
Lead wire
• Be sure to attach each screw to its correspondent
terminal when securing the cord and/or the wire to
the terminal block.
• Make earth wire a little longer than others.
(More than 35 mm)
• For future servicing, give extra length to the con-
necting wires.
1 2 3 C
<OUTDOOR UNIT>
Indoor/outdoor unit
connecting wire
<INDOOR UNIT>
Terminal block
Terminal block Terminal block
Terminal block for
power supply
Terminal block
<INDOOR UNIT>
POWER SUPPLY
~/N 230 V 50 Hz
This unit has demand response capability which is compliant with AS/NZS 4755.3.1. To activate this function, you need to make a contract with remote
agents such as electric supply company, then this unit should be connected to Demand response enabling devise (DRED). For further information,
consult your dealer. This unit supports 3 Demand Response Modes (DRMs): DRM1, DRM2 and DRM3.
CAUTION
• To prevent malfunction caused by noise, route the cord connecting this unit to DRED and the power supply cord as parallel as possible.
• Do not connect the demand control transmission cable to the terminal block for power supply.
• Do not pull, extremely bend or apply strong pressure on the wire to prevent failure.
• Do not screw DRED to outdoor unit.
• Do not put DRED in outdoor unit.
• Secure electrical wiring above clamp.
• Do not get DRED wire caught in the service panel.
1 : DRM 1
2 : DRM 2
3 : DRM 3
C : COMMON
AS/NZS4755
terminal block

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Fig. 1 Fig. 2
Fig. 3 Fig. 4
Fig. 5 Fig. 6
3-1. FLARING WORK
Pipe diameter
(mm) Nut (mm)
A (mm) Tightening torque
Clutch
type tool
for R410A
Clutch
type tool
for R22
Wing nut
type tool
for R22 N•m kgf•cm
ø6.35 (1/4”) 17
0 to 0.5 1.0 to 1.5 1.5 to 2.0 13.7 to 17.7 140 to 180
ø9.52 (3/8”) 22 34.3 to 41.2 350 to 420
ø12.7 (1/2”) 26 2.0 to 2.5 49.0 to 56.4 500 to 575
ø15.88 (5/8”) 29 73.5 to 78.4 750 to 800
Tilted Uneven Burred
Good No good
Burr Copper pipe
Spare reamer
Pipe cutter
Smooth all
around
Even length
all around
Inside is shin-
ing without any
scratches.
Flare nut
Die Copper pipe
Clutch type
Flaring tool
Wing nut type
3-2. PIPE CONNECTION
1)Applyathincoatofrefrigerationoil(G)tothearedendsofthepipes
and the pipe connections of the outdoor unit. Do not apply refrigeration
oil on screw threads. Excessive tightening torque will result in damage
on the screw.
2) Alignthe centerofthe pipe withthatof thepipeconnections oftheoutdoor
unit,thenhandtightenthearenut3to4turns.
3)Tightenthearenutwithatorquewrenchasspeciedinthetable.
• Over-tighteningmaycausedamagetothearenut,resultinginrefriger-
ant leakage.
• Be sure to wrap insulation around the piping. Direct contact with the
bare piping may result in burns or frostbite.
3-3. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Usingpiping tape(E), applytaping starting fromthe entryof outdoorunit.
• Stoptheend ofpipingtape(E) withtape(with adhesive agentattached).
• Whenpipinghave tobearranged through aboveceiling,closet or where
the temperature and humidity are high, wind additional commercially
sold insulation to prevent condensation.
Copper
pipe
1) Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)
2) Completely remove all burrs from the cut cross section of pipe. (Fig. 3)
• Aim the copper pipe downward while removing burrs to prevent burrs
from dropping in the pipe.
3)Removearenutsattachedtoindoorandoutdoorunits,thenputthem
on pipe having completed burr removal. (Not possible to put them on
afteraringwork.)
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown
in the table. Select A mm from the table according to the tool selected.
5) Check
• ComparethearedworkwithFig.6.
• Ifareisnotedtobedefective,cutoffthearedsectionanddoaring
work again.
WARNING
When installing the unit, securely
connect the refrigerant pipes before
starting the compressor.
CAUTION
When there are the ports which are
not used, make sure their nuts are
tightened securely.
4-1. PURGING PROCEDURES AND LEAK TEST
1) Remove service port cap of stop valve on the side of the outdoor unit
gas pipe. (The stop valves are fully closed and covered in caps in their
initial state.)
2) Connect gauge manifold valve and vacuum pump to service port of stop
valve on the gas pipe side of the outdoor unit.
3) Run the vacuum pump. (Vacuumize for more than 15 minutes.)
4) Checkthe vacuumwith gauge manifoldvalve, then closegauge manifold
valve, and stop the vacuum pump.
5) Leave as it is for one or two minutes. Make sure the pointer of gauge
manifoldvalveremainsinthesameposition.Conrmthatpressuregauge
shows -0.101 MPa [Gauge] (-760 mmHg).
6) Remove gauge manifold valve quickly from service port of stop valve.
7) Fully open all stop valves on the gas pipe and the liquid pipe. Operating
without fully opening lowers the performance and this causes trouble.
8) Referto 1-2.,and chargethe prescribedamount ofrefrigerant ifneeded.
Be sure to charge slowly with liquid refrigerant. Otherwise, composition
of the refrigerant in the system may be changed and affect performance
of the air conditioner.
9) Tighten cap of service port to obtain the initial status.
10 )Leak test
Stop valve
for GAS
Gauge mani-
fold valve (for
R410A)
Compound pressure
gauge (for R410A)
–0.101MPa
(–760 mmHg)
Handle
Low Handle High
Vacuum pump
(for R410A)
Charge hose
(for R410A)
*Close
*Open
Hexagonal
wrench
*4 to 5 turns
Stop valve
for LIQUID
Pressure gauge
(for R410A)
Precautions when us-
ing the control valve When attaching the control valve
to the service port, valve core may
deform or loosen if excess pres-
sure is applied. This may cause
gas leak.
Service port
Charge hose
(for R410A)
Body Close Open
Control valve
AWhen attaching the control valve to
the service port, make sure that the
valve core is in closed position, and
then tighten part A. Do not tighten
part A or turn the body when valve
core is in open position.
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
Stop valve cap
(Torque 24.4 to
30.4 N•m, 250 to
310 kgf•cm)
Service port cap
(Torque 10 to 12 N•m,
100 to 120 kgf•cm)
Service port cap
(Torque 10 to 12 N•m,
100 to 120 kgf•cm)
Stop valve cap
(Torque 21.5 to
27.5 N•m, 220
to 280 kgf•cm)
3. FLARING WORK AND PIPE CONNECTION

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4-3. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)
4-4. LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT
4-2. GAS CHARGE
Perform gas charge to unit.
1) Connect gas cylinder to the service port of stop valve.
2) Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3)Replenishspeciedamountoftherefrigerant,whileoperatingtheairconditioner
for cooling.
Note:
Incaseofaddingrefrigerant,complywiththequantityspeciedfortherefrigerat-
ing cycle.
CAUTION:
When charging the refrigerant system with additional refrigerant, be sure to use
liquidrefrigerant.Adding gasrefrigerantmay changethecomposition oftherefriger-
ant in the system and affect normal operation of the air conditioner. Also, charge
the liquid refrigerant slowly, otherwise the compressor will be locked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder with
warmwater(under40°C)duringcoldseason.Butneverusenakedreorsteam.
COOL/DRY HEAT
• Description of the function:
With this function, once the operation mode is locked to either COOL/DRY mode or
HEAT mode, the air conditioner operates in that mode only.
* Changing the setting is required to activate this function. Please explain about this func-
tion to your customers and ask them whether they want to use it.
[How to lock the operation mode]
1) Be sure to turn off the main power for the air conditioner before making the setting.
2) Set the “3” of SW1 on the outdoor controller board to ON to enable this function.
3) To lock the operation mode in COOL/DRY mode, set the “4” of SW1 on the outdoor
controller board to OFF. To lock the operation in HEAT mode, set the same switch to
ON.
4) Turn on the main power for the air conditioner.
• Description of the function:
With this function, the operating noise of the outdoor unit can be lowered by reducing the operation load, for example, during nighttime in COOL mode.
However, please note that the cooling and heating capacity may lower if this function is activated.
* Changing the setting is required to activate this function. Please explain about this function to your customers and ask them whether they want to use it.
Union
Stop valve
Liquid
pipe
Indoor
unit
Stop valve with
service port Gas
pipe
Refrigerant gas
cylinder
operating valve
(for R410A) Gauge manifold
valve (for R410A)
Charge hose
(for R410A)
Refrigerant gas cylinder for R410A with siphon
Electronic scale for refrigerant charging
Refrigerant (liquid)
Outdoor
unit
Union
Union
Union
SW1
ON
1 2 3 4 5 6
SW1
ON
1 2 3 4 5 6
SW1
ON
1 2 3 4 5 6
Lower the operating noise
[How to lower the operating noise]
1) Be sure to turn off the main power for the air conditioner before making the
setting.
2) Set the “5” of SW1 on the outdoor controller board to ON to enable this function.
3) Turn on the main power for the air conditioner.
LED
SW1
SW871
SW2
Terminal block
for DRED Interface

En-7
4-5. TEST RUN
• Test runs of the indoor units should be performed individually. See the installation manual coming with the indoor unit, and make sure all the units operate
properly.
• If the test run with all the units is performed at once, possible erroneous connections of the refrigerant pipes and the indoor/outdoor unit connecting wires
cannot be detected. Thus, be sure to perform the test run one by one.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner.
Wiring/piping correction function
This unit has a wiring/piping correction function which corrects wiring and piping combination. When there is possibility of incorrect wiring and piping combi-
nation,andconrmingthecombinationisdifcult,usethisfunctiontodetectandcorrectthecombinationbyfollowingtheproceduresbelow.
Make sure that the following is done.
• Power is supplied to the unit.
• Stop valves are open.
Note:
During detection, the operation of the indoor unit is controlled by the outdoor unit. During detection, the indoor unit automatically stops operation. This is not
a malfunction.
Procedure
Press the piping/wiring correction switch (SW871) 1 minute or more after turning on the
power supply.
• Correction completes in 10 to 20 minutes. When the correction is completed, its result
is shown by LED indication. Details are described in the following table.
• To cancel this function during its operation, press the piping/wiring correction switch
(SW871) again.
• When the correction completed without error, do not press the piping/wiring correction
switch (SW871) again.
When the result was “cannot be corrected”, press the piping/wiring correction switch
(SW871)againtocancelthisfunction.Then,conrmthewiringandpipingcombinationin
a conventional manner by operating the indoor units one by one.
• The operation is done while the power is supplied. Make sure not to contact parts other
than the switch, including the P.C. board. This may cause electric shock or burn by hot
parts and live parts around the switch. Contacting the live parts may cause P.C. board
damage.
• Toprevent electronic controlP.C. boarddamage,make sureto perform staticelimination
before operating this function.
• This function does not operate when the outside temperature is 0°C or below.
LED indication during detection:
LED1
(Red) LED2 (Yellow) LED3 (Green)
Lit Lit Once
Result of piping/wiring correction function
LED1
(Red) LED2 (Yellow) LED3 (Green) Result
Lit Not lit Lit Completed (Problem corrected or
normal)
Once Once Once Not completed
(Detection failed)
Other indications
Refer to “SAFETY PRE-
CAUTIONS WHEN LED
BLINKS” located behind
the service panel.
4-6. EXPLANATION TO THE USER
• UsingtheOPERATINGINSTRUCTIONS,explaintotheuserhowtousetheairconditioner(howtousetheremotecontroller,howtoremovetheairlters,
how to remove or put the remote controller in the remote controller holder, how to clean, precautions for operation, etc.).
• Recommend the user to read the OPERATING INSTRUCTIONS carefully.
When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere.
1) Turn off the breaker.
2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.
3) Fully close the stop valve on the liquid pipe side of the outdoor unit.
4) Turn on the breaker.
5) Start the emergency COOL operation on all the indoor units.
6) When the pressure gauge shows 0 – 0.05 MPa [Gauge] (approx. 0 – 0.5 kgf/cm2), fully close the stop valve on the gas pipe side of the outdoor unit and
stop the operation. (Refer to the indoor unit installation manual about the method for stopping the operation.)
* If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0 – 0.05 MPa [Gauge] (approx. 0 – 0.5 kgf/cm2), or
the protection function may operate due to the pressure increase in the high-pressure refrigerant circuit. If this occurs, use a refrigerant collecting device
to collect all of the refrigerant in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have
been relocated.
7) Turn off the breaker. Remove the pressure gauge and the refrigerant piping.
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes.
WARNING
5. PUMPING DOWN

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VH79B003H01
HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN