Split-type Air-Conditioner
MXZ-3D54VA
MXZ-4D71VA
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.
JG79A651H01_en.indd
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English
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ENGLISH
Required Tools for Installation
Phillips screwdriver
Flare tool for R410A
Level
Gauge manifold for R410A
Scale
Vacuum pump for R410A
Utility knife or scissors
Charge hose for R410A
Torque wrench
Pipe cutter with reamer
Wrench (or spanner)
4 mm hexagonal wrench
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
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 specified 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.
WARNING
(Could lead to death, serious injury, etc.)
n Do not install the unit by yourself (user).
Incomplete installation could cause fire or electric shock, injury due to the
unit falling, or leakage of water. Consult the dealer from whom you purchased the unit or a qualified installer.
n Perform the installation securely referring to the installation manual.
Incomplete installation could cause fire, electric shock, injury due to the
unit falling, or leakage of water.
n When installing the unit, use appropriate protective equipment and
tools for safety.
Failure to do so could cause injury.
n Install 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 qualified, experienced electrician, 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 insufficient or there is incomplete
electrical work, it could result in a fire or an electric shock.
n Do not damage the wires by applying excessive pressure with parts
or screws.
Damaged wires could cause fire 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 specified wires to connect the indoor and outdoor units securely and attach the wires firmly 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 fire.
n Do not install the unit in a place where inflammable 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 fire or an electric shock due to defective contact, defective insulation, exceeding the permissible current, etc.
n Be sure to use the parts provided or specified parts for the installation work.
The use of defective parts could cause an injury or leakage of water due
to a fire, 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 fire. If loose parts are found on the
power supply plug, replace it.
CAUTION
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 fire 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 specified 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 refrigerant other than that specified 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 fire, 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 flame
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 appropriate 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.
When
installing the unit, securely connect the refrigerant pipes
n
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 in the refrigeration cycle could become abnormally high. This
could cause the pipes to burst or injury.
n Fasten a flare nut with a torque wrench as specified in this manual.
If fastened too tight, a flare nut may break after a long period and cause
refrigerant leakage.
n The unit shall be installed in accordance with national wiring regulations.
n Earth the unit correctly.
Do not connect the earth to a gas pipe, water pipe, lightning rod or telephone earth. Defective earthing could cause electric shock.
n Be sure to install an earth leakage breaker.
Failure to install an earth leakage breaker may result in electric shock
or fire.
(Could lead to serious injury in particular environments when operated incorrectly.)
n Perform the drainage/piping work securely according to the installation 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 fins of the outdoor unit.
This could cause injury.
n Do 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 fire. Also, advise user
to keep the area around the unit clean.
1-2.SPECIFICATIONS
Power supply *1
Model
MXZ-3D54VA
MXZ-4D71VA
Rated
Fre- Breaker
Voltage quency capacity
230 V
50 Hz
25 A
Wire specifications *2
Pipe length and height difference *3, *4, *5, *6, *7, *8
Max. no. of bends
Max. pipe length
Indoor/outdoor
Refrigerant adjustMax. height
Power supply
per indoor unit /
per indoor unit /
ment A *10
connecting wire
difference *9
for multi system
for multi-system
3-core 2.5 mm2
4-core
1.0/1.5 mm2
*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 specifications specified in
the installation manual of the indoor unit.
*3 Never use pipes with thickness less than specified. The pressure resistance will be insufficient.
*4 Use a copper pipe or a copper-alloy seamless pipe.
*5 Be careful not to crush or bend the pipe during pipe bending.
25 m / 50 m
25 m / 60 m
15 m
25 / 50
25 / 60
20 g/m
*6 Refrigerant pipe bending radius must be 100 mm or more.
*7 Insulation material : Heat resisting foam plastic 0.045 specific gravity
*8 Be sure to use the insulation of specified thickness. Excessive thickness
may cause incorrect installation of the indoor unit and insufficient 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.
*10If pipe length exceeds 40 m, additional refrigerant (R410A) charge is required. (No additional charge is required for pipe length less than 40 m.)
Additional refrigerant = A × (pipe length (m) - 40)
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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.
(Unit: mm (inch))
MXZ3D54VA
-
Port size of outdoor unit
MXZLiquid / Gas
4D71VA
A UNIT
A - C UNIT B - D UNIT
6.35 (1/4) / 12.7 (1/2)
6.35 (1/4) / 9.52 (3/8)
Optional different-diameter joints (port size of outdoor unit → diameter of connection pipe)
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.
1-4.SELECTING THE INSTALLATION LOCATION
•
•
•
•
•
Where it is not exposed to strong wind.
Where airflow 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 operation 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. Operation of the air conditioner may interfere with radio or TV reception in
areas where reception is weak. An amplifier 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 baffle boards.
Note:
It is advisable to make a piping loop near outdoor unit so as to reduce
vibration transmitted from there.
FREE SPACE REQUIRED AROUND OUTDOOR UNIT
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 figure is provided.
100 or more
500 or more
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 baffle
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 flammable gas could leak.
• Where there is much machine oil.
• Where oil is splashed or where the area is filled 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 sulfide 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 cracking.
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)
200 or more
350 or more
100 or more
3.Obstacles in front (blowing) only
4.Obstacles in front and behind
When there is an obstacle in front of
the unit as shown in the figure, open
space above, behind, and on the
sides of the unit is required.
500 or more
The unit can be used by attaching an optional outdoor
blowing guide (MAC-856SG)
(but both sides and top are
open).
100 or more
500 or more
Blowing guide (MAC-856SG)
6.Service space
5.Obstacles in front, behind and on side(s)
• 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 airflow 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.
Provide space for service and maintenance as shown in the figure.
Service space
100 or more
500 or more
200 or more
100 or more
350 or more
100 or more
500 or more
Height of the obstacle is 1200 or less
500 or more
350 or more
350 or more
(Unit: mm)
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1-5.INSTALLATION DIAGRAM
After the leak test, apply insulating material tightly so that there is
no gap.
ACCESSORIES
Check the following parts before installation.
(1) Drain socket
(2) Drain cap
1
2
PARTS TO BE PROVIDED AT YOUR SITE
When the piping is to be attached 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
flare according to the dimension
for new refrigerant.
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
More than
100 mm
(A)
(B)
(C)
(D)
(E)
Power supply cord*
Indoor/outdoor unit connecting wire*
Extension pipe
Wall hole cover
Piping tape
Extension drain hose
(F) (or soft PVC hose, 15 mm inner
diameter or hard PVC pipe VP16)
(G) Refrigeration oil
(H)
(I)
(J)
(K)
Putty
Pipe fixing band
Fixing screw for (I)
Wall hole sleeve
Soft PVC hose, 15 mm inner di(L) ameter or hard PVC pipe VP16 for
drain socket (1)
1
1
1
1
1
1
Little
amount
1
2 to 7
2 to 7
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.
Open as a rule
More than 500 mm if the back,
both sides and top are open
More than 350 mm
IMPORTANT NOTES
To comply with the requirements of Australian 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.
Outdoor unit installation
Units should be installed by licensed contractor
according to local code requirements.
840
396
Air inlet
361
500
Air inlet
330
169
Air outlet
4-10 × 21 Oval holes
(Unit: mm)
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.
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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 tightening, pull the wires lightly to confirm 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/outdoor unit connecting wire (B), be sure to fix both cable and wire with cable
clamps.
Terminal block for power supply
4D71VA
Service panel
<OUTDOOR UNIT>
Indoor/outdoor unit
connecting wire
Terminal block
15 mm
Terminal block for
power supply
Terminal block
35 mm
Lead wire
Terminal block
POWER SUPPLY
~/N 230 V 50 Hz
Terminal block
<INDOOR UNIT>
• 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.
D unit is for 4D71VA only
3. FLARING WORK AND PIPE CONNECTION
3-1.FLARING WORK
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 flare nuts attached to indoor and outdoor units, then put them on
pipe having completed burr removal. (Not possible to put them on after flaring
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 flared work with Fig. 6.
• If flare is noted to be defective, cut off the flared section and do flaring work
again.
A (mm)
Pipe diameter Nut
Clutch
Clutch
(mm) type tool type tool (mm)
for R410A for R22
ø6.35 (1/4”) 17
ø9.52 (3/8”) 22
0 to 0.5 1.0 to 1.5
ø12.7 (1/2”) 26
ø15.88 (5/8”) 29
Tilted Uneven Burred
Fig. 1
Fig. 2
Flaring tool
Burr
Copper pipe
Spare reamer
Pipe cutter
Tightening torque
Wing nut
type tool for R22
N•m
13.7 to 17.7
34.3 to 41.2
49.0 to 56.4
2.0 to 2.5
73.5 to 78.4
1.5 to 2.0
Clutch type
Fig. 3
kgf•cm
140 to 180
350 to 420
500 to 575
750 to 800
No good
Good
Copper
pipe
Wing nut type
Fig. 4
Smooth all
around
Inside is shining without any
scratches.
Copper pipe
Die
Even length
all around
Flare nut
Fig. 5
3-2.PIPE CONNECTION
1)Apply a thin coat of refrigeration oil (G) to the flared 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 flare nut 3 to 4 turns.
3)Tighten the flare nut with a torque wrench as specified in the table.
• Over-tightening may cause damage to the flare 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.
Fig. 6
WARNING
When installing the unit, securely
connect the refrigerant pipes before
starting the compressor.
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.
CAUTION
When there are the ports which are
not used, make sure their nuts are
tightened securely.
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4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
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)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. Confirm 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)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
Stop valve cap
(Torque 19.6 to
29.4 N•m, 200
to 300 kgf•cm)
*4 to 5 turns
*Close
Compound pressure
–0.101MPa gauge (for R410A)
(–760 mmHg)
Pressure gauge
(for R410A)
*Open
Gauge manifold
valve (for R410A)
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
Stop valve
for GAS
Precautions when using
the control valve
A
Control
valve
Close
Handle High
Handle
Low
Hexagonal wrench
Body
Open
Stop valve
for LIQUID
Charge hose
(for R410A)
Vacuum pump
(for R410A)
When attaching the control valve to
the service port, valve core may deform or loosen if excess pressure is
applied. This may cause gas leak.
Service port
When attaching the control valve to
the service port, make sure that the
Charge hose valve core is in closed position, and
then tighten part A. Do not tighten
(for R410A)
part A or turn the body when valve
core is in open position.
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 specified amount of the refrigerant, while operating the air conditioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the refrigerating 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 fire or steam.
Stop valve
Liquid
pipe
Union
Union
Indoor
unit
Union
Union
Refrigerant gas cylinder operating valve
(for R410A)
Stop valve with
service port
Gauge manifold
valve (for R410A)
Outdoor
unit
Gas
pipe
* D unit is for
4D71VA only.
Charge hose
(for R410A)
Refrigerant gas cylinder for R410A with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
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 fix the maintenance panel.
2)Remove the maintenance panel, and perform necessary settings.
3)Install the maintenance panel.
Note:
Make sure to fix the maintenance panel securely. Incomplete installation
could cause malfunction.
Maintenance panel
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4-4. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (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 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.
COOL/DRY
HEAT
4-5. LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT
• 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.
[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.
Lower the operating noise
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 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 combination, and confirming the combination is difficult, 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 15 minutes. When the correction is completed, its result LED indication during detection:
is shown by LED indication. Details are described in the following table.
LED1
LED2
LED3
• To cancel this function during its operation, press the piping/wiring correction switch
(Green)
(Red)
(Yellow)
(SW871) again.
Lighted
Lighted
Once
• When the correction completed without error, do not press the piping/wiring correction
switch (SW871) again.
Result of piping/wiring correction function
When the result was “cannot be corrected”, press the piping/wiring correction switch
LED1
LED2
LED3
Result
(SW871) again to cancel this function. Then, confirm the wiring and piping combination
(Red)
(Yellow)
(Green)
in a conventional manner by operating the indoor units one by one.
Completed
• The operation is done while the power is supplied. Make sure not to contact parts
Lighted Not lighted Lighted (Problem corrected or
other than the switch, including outdoor control P.C. board. This may cause electric
normal)
shock or burn by hot parts and live parts around the switch. Contacting the live parts
Not completed
Once
Once
Once
may cause outdoor control P.C. board damage.
(Detection failed)
• To prevent outdoor control P.C. board damage, make sure to perform static eliminaRefer to “SAFETY PREtion before operating this function.
CAUTIONS WHEN LED
Other indications
• This function does not operate when the outside temperature is 0°C or below.
FLASHES” located behind
the service panel.
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 filters, 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.
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/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.
WARNING
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.
En-
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HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
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