Mitsubishi Electric MXZ-3D54VA User manual

Split-type Air-Conditioner
MXZ-3D54VA
MXZ-4D71VA
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. BEFORE INSTALLATION
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.
1-2. SPECIFICATIONS
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 pur-
chased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 elec-
trician, according to the installation manual. Be sure to use an exclu-
sive 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 se-
curely 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 exten-
sion cord and do not connect many devices to one AC outlet.
Itcouldcauseareoranelectricshockduetodefectivecontact,defec-
tive insulation, exceeding the permissible current, etc.
n Be sure to use the parts provided or specied parts for the installa-
tion 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 complete-
ly 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.
Any presence of foreign substance such as air can cause abnormal
pressure rise and may result in explosion or injury. The use of any re-
frigerant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.
The pressure of R410A is 1.6 times more than R22. Not using appropri-
ate 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 run-
ning 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 pres-
sure in the refrigeration cycle could become abnormally high. This
could cause 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 regu-
lations.
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/piping work securely according to the installa-
tion manual.
If there is defect in the drainage/piping work, water could drop from the
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 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/out-
door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resist-
ance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 thick-
ness 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 40 m, additional refrigerant (R410A) charge is re-
quired. (No additional charge is required for pipe length less than 40 m.)
Additional refrigerant = A × (pipe length (m) - 40)
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...............................4
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN.........5
5. RELOCATION AND MAINTENANCE ..........................................6
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 adjust-
ment A *10
MXZ-3D54VA 230 V 50 Hz 25 A 3-core 2.5 mm24-core
1.0/1.5 mm225 m / 50 m 15 m 25 / 50 20 g/m
MXZ-4D71VA 25 m / 60 m 25 / 60
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3. Obstacles in front (blowing) only
When there is an obstacle in front of
theunitasshowninthegure,open
space above, behind, and on the
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)
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-
3D54VA MXZ- 4D71VA Liquid / Gas 6.35 (1/4) →9.52 (3/8) : PAC-493PI
9.52 (3/8) →12.7 (1/2) : MAC-A454JP
9.52 (3/8) →15.88 (5/8) : PAC-SG76RJ
12.7 (1/2) →9.52 (3/8) : MAC-A455JP
12.7 (1/2) →15.88 (5/8) : MAC-A456JP
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)
A - C UNIT B - D UNIT 6.35 (1/4) / 9.52 (3/8)
FREE SPACE REQUIRED AROUND OUTDOOR UNIT
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 op-
eration 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. Op-
eration 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af-
fected 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.
• Whereoilissplashedorwheretheareaislledwithoilysmoke(such
as cooking areas and factories, in which the properties of plastic
could be changed and damaged).
• Salty places such as the seaside.
• Wheresuldegasisgeneratedsuchasahotspring.
• 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 crack-
ing.
500 or more
200 or more
350 or more
100 or more
1. Obstacles above
When there is no obstacle in front
and on the sides of the unit, it is al-
lowed 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
(Unit: mm (inch))
• 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.
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 (MAC-856SG)
(but both sides and top are
open).
100 or more
500 or more
Blowing guide (MAC-856SG)
200 or more
100 or more 350 or more
500 or more 500 or more
(Unit: mm)
Height of the obstacle is 1200 or less
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After the leak test, apply insulat-
ing material tightly so that there is
no gap.
When the piping is to be at-
tached 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 piping or wrap 7
to 8 turns of insulation 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.
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
1-5. INSTALLATION DIAGRAM
ACCESSORIES
Check the following parts before installation.
(1) Drain socket 1
(2) Drain cap 2
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 di-
ameter 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 quan-
tity to be used per indoor unit.
Units should be installed by licensed contractor
according to local code requirements.
Outdoor unit installation
Air inlet
169 500
Air inlet
4-10 × 21 Oval holes
396
Air outlet
840
(Unit: mm)
361 330
1-6. DRAIN PIPING FOR OUTDOOR UNIT
Please perform the drain piping work only when draining from one place.
1) Choose one hole to discharge drain and install the drain socket (1) to the hole.
2) Close the rest of the holes with the drain caps (2).
3) Connect the soft PVC hose (L) of 15 mm in the inside diameter on the market with the drain socket (1) and lead drain.
Note:
Install the unit horizontally.
Do not use the drain socket (1) and the drain caps (2) in the cold regions. Drain may freeze and it makes the fan stop.
The outdoor unit produces condensate during the heating operation. Select the installation place to ensure to prevent the outdoor unit and/or the grounds
from being wet by drain water or damaged by frozen drain water.
IMPORTANT NOTES
To comply with the requirements ofAustralian standard AS/NZS 3000 electrical installations (wiring
rules), the electrical wiring required between the indoor and outdoor units must be installed by a
licenced electrical contractor.
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4D71VA
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 connecting wires.
<OUTDOOR UNIT>
Indoor/outdoor unit
connecting wire
<INDOOR UNIT>
Terminal block
POWER SUPPLY
~/N 230 V 50 Hz
Terminal block Terminal block
Terminal block for
power supply
Terminal block
D unit is for 4D71VA only
2. OUTDOOR UNIT INSTALLATION
2-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Loosen terminal screw, and connect indoor/outdoor unit connecting 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 tighten-
ing,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 CONNECTION is
completed.
• After making connections between both power supply cord (A) and indoor/out-
doorunitconnectingwire(B),besuretoxbothcableandwirewithcable
clamps.
Terminal block for power supply
Service panel
Fig. 1 Fig. 2
Fig. 3 Fig. 4
Fig. 5 Fig. 6
3. FLARING WORK AND PIPE CONNECTION
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) Align the center of the pipe with that of the pipe connections of the outdoor
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refrigerant
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) Using piping tape (E), apply taping starting from the entry of outdoor unit.
• Stop the end of piping tape (E) with tape (with adhesive agent attached).
• When piping have to be arranged through above ceiling, 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.
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4-1. PURGING PROCEDURES AND LEAK TEST
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
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 condi-
tioner 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
liquid refrigerant. Adding gas refrigerant may change the composition of the
refrigerant 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.
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) Check the vacuum with gauge manifold valve, then close gauge
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. Operat-
ing without fully opening lowers the performance and this causes
trouble.
8) Refer to 1-2., and charge the prescribed amount of refrigerant if
needed. 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
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
*D unit is for
4D71VA only.
Union
Union
Union
Stop valve
for GAS
Stop valve cap
(Torque 19.6 to
29.4 N•m, 200
to 300 kgf•cm)
Gauge manifold
valve (for R410A)
Compound pressure
gauge (for R410A)
–0.101MPa
(–760 mmHg)
Handle
Low Handle High
Vacuum pump
(for R410A)
*Close
*Open
Hexagonal wrench
*4 to 5 turns
Stop valve
for LIQUID
Pressure gauge
(for R410A)
Precautions when using
the control valve When attaching the control valve to
the service port, valve core may de-
form or loosen if excess pressure is
applied. This may cause gas leak.
Service port
Charge hose
(for R410A)
Body
Close Open
Control
valve
A
When 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.
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
Charge hose
(for R410A)
4-3. REMOVING THE MAINTENANCE PANEL
The setting of Dip Switch on the outdoor control P.C. board can be
changed without removing the front panel.
Follow the procedures below to remove the maintenance panel and set
the Dip Switch.
1)Removescrew(s)whichxthemaintenancepanel.
2) Remove the maintenance panel, and perform necessary settings.
3) Install the maintenance panel.
Note:
Makesuretoxthemaintenancepanelsecurely.Incompleteinstallation
could cause malfunction.
Maintenance panel
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En-6
4-4. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)
4-5. LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT
• 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 function 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 “1” of SW2 on the outdoor control P.C. board to ON to enable this
function.
3) To lock the operation mode in COOL/DRY mode, set the “2” of SW2 on the
outdoor control P.C. 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.
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 “3” of SW2 on the outdoor control P.C. board to ON to enable this function.
3) Turn on the main power for the air conditioner.
4-6. 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 oper-
ate 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.
5. PUMPING DOWN
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 0.05 to 0 MPa [Gauge] (approx. 0.5 to 0 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 0.05 MPa [Gauge] (approx. 0.5 kgf/cm
2
), or the protec-
tion 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
4-7. 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l-
ters, 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.
HEAT
COOL/DRY
Procedure
Press the piping/wiring correction switch (SW871) 1 minute or more after turning on the
power supply.
• Correction completes in 10 to 15 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 outdoor control 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 outdoor control P.C. board damage.
• To prevent outdoor control P.C. board damage, make sure to perform static elimina-
tion 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)
Lighted Lighted Once
Result of piping/wiring correction function
LED1
(Red) LED2 (Yellow) LED3 (Green) Result
Lighted Not lighted Lighted Completed
(Problem corrected or
normal)
Once Once Once Not completed
(Detection failed)
Other indications
Refer to “SAFETY PRE-
CAUTIONS WHEN LED
FLASHES” located behind
the service panel.
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JG79A651H01
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
JG79A651H01_cover.indd 2 2013/08/22 14:24:52