Page 1
JG79A344H03
Phillips screwdriver
Level
Scale
Utility knife or scissors
3 in. (75 mm) hole saw
Torque wrench
Wrench (or spanner)
SPLIT-TYPE AIR CONDITIONERS
ENGLISH
INSTALLATION MANUAL
MSZ-FE18NA
MSZ-GE24NA
MSY-GE24NA
When installing multi units, refer to the installation manual of the multi unit for outdoor unit
installation.
1. BEFORE INSTALLATION
1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
• Be sure to read these safety precautions and instructions.
• Be sure to observe the warnings and cautions specified here.
• After reading this manual, be sure to store it with the OPERATING INSTRUCTIONS for future reference.
• Please report to your supply authority or obtain their consent before connecting this equipment to the power supply system.
Required Tools for Installation
5/32 in. (4 mm) hexagonal wrench
Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
WARNING
N Do not install the unit by yourself (user).
Improper or incomplete installation could cause fire, electric shock, injury due to the
unit falling, or water leakage. Consult a qualified installer or the dealer from whom
you purchased the unit.
N Follow the instructions detailed in the installation manual.
Incomplete installation could cause fire or 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 that 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 Perform electrical work according to the installation manual and 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 Ground the unit correctly.
Do not connect the ground wire to a gas pipe, water pipe, lightning rod or telephone
ground. Defective grounding could cause electric shock.
N Do not damage the wires.
Damaged wires could cause fire.
N Be sure to shut off the main power when setting up the indoor P.C. board or
wiring.
Failure to do so could cause electric shock.
N Use the specified wires to securely connect the indoor and outdoor units. At-
tach the wires firmly to avoid applying stress to the terminal block.
Improper connection could cause fire.
N Do not install the unit in a place where flammable gas may leak.
If gas leaks and accumulates around the unit, it could cause an explosion.
N Do not use intermediate connection of the power cord or the extension cord.
Do not connect many devices to one AC outlet.
It could cause a fire or an electric shock.
N 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, blockage, or loose parts both in the outlet and on the plug. Verify that
the power supply plug is completely in the outlet.
If there is dust, blockage, 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 Depending on the installation area, install a Ground Fault Interrupt (GFI) circuit
breaker.
If the Ground Fault Interrupt (GFI) circuit breaker is not installed, an electric shock
could occur.
N Perform the drainage/piping work securely according to the installation
manual.
If there is defect in the drainage/piping work, water could drip from the unit, and
damage household items.
(Could lead to death or serious injury.)
N Securely attach the electrical cover to the indoor unit and the service panel to
the outdoor unit.
If the electrical cover of the indoor unit and/or the service panel of the outdoor unit are
not attached securely, dust, water, etc. could collect in the unit and could cause a fire or
an electric shock.
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.
Do not discharge the refrigerant into the atmosphere.
N
does not leak after installation has been completed.
installation, ventilate the room.
If refrigerant comes in contact with a fire, harmful gas could be generated.
If refrigerant gas leaks indoors, and comes into contact with the flame of a fan heater,
space heater, stove, etc., harmful gases will be generated.
N Use appropriate tools and piping materials for installation.
The pressure of R410A is 1.6 times higher than R22. Not using the appropriate tools
and materials, or improper installation could cause the pipes to burst causing an
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, causing the pipes to burst.
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 the stop
valve is open, air could be drawn in and the pressure in the refrigeration cycle could
become abnormally high, causing the pipes to burst.
N Fasten a flare nut with a torque wrench as specified in this manual.
If fastened too tight, a flare nut could break and cause refrigerant leakage.
N Install the unit according to national wiring regulations.
(Could lead to serious injury when operated incorrectly.)
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 the unit and damage its electrical parts, it could cause a mal-
function, smoke emission, or fire. Keep the area around the unit clean.
Check that the refrigerant gas
If refrigerant leaks during
Page 2
1-2. SELECTING THE INSTALLATION LOCATION
INDOOR UNIT
• Where airflow is not blocked.
Where cool air aspreads over the entire room.
•
• On a rigid wall to reduce the possibility of vibration.
• Where it is not exposed to direct sunlight.
• Where it can be easily drained.
• At a distance 3 ft. (1 m) or more away from a TV and
radio. Operation of the air conditioner may interfere
with radio or TV reception. An amplifier may be required for the affected device.
• In a place as far away as possible from fluorescent
and incandescent lights (so the infrared remote control
can operate the air conditioner normally).
Where the air filter can be removed and replaced easily.
•
Note:
Install the indoor unit high on the wall where air can distribute over the entire room.
REMOTE CONTROLLER
• Where it is convenient to operate and easily visible.
Where children cannot easily touch it.
•
• Select a position about 4 ft. (1.2 m) above the floor.
Check that signals from the remote controller from that
position are received by the indoor unit (‘beep’ or ‘beep
beep’ receiving tone sounds). Then, attach remote controller holder to a pillar or wall and install wireless remote
controller.
Note:
In rooms where inverter type fluorescent lamps are used,
the signal from the wireless remote controller may not be
received.
OUTDOOR UNIT
• Where it is not overly exposed to strong winds.
Where airflow is good and dustless.
•
• 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.
• If installing the unit in a location high above the ground,
be sure to secure the unit legs.
• Where it is at least 10 ft. (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 baffle boards.
Note:
• It is advisable to make a piping loop near outdoor unit
so as to reduce vibration.
• For increased efficiency, install the outdoor unit in a
location where continuous direct sunlight or excessive
water can be avoided as much as possible.
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 and
board on the air outlet side.
Avoid the following places for installation where air
conditioner trouble is liable to occur.
• Where flammable gas could leak.
• Where there is an excessive amount of machine oil
in the air.
• Salty places such as the seaside.
• Where sulfide gas is generated such as a hot
spring.
Where there is high-frequency or wireless equipment.
•
a baffle
1-3. SPECIFICATIONS
1-3-1. POWER SUPPLY AND INDOOR/OUTDOOR WIRE CONNECTION
• Power should be taken from an exclusive branched circuit.
• Wiring work should be based on applicable technical standards.
• Wiring connections should be made following the diagram.
• Securely tighten screws.
Connecting wires and the ground wire
• Use solid conductor AWG14 or stranded conductor AWG14.
• Use double insulated copper wire with 600 V insulation.
• Use copper conductors only.
* Follow local electrical codes.
Power supply cable and ground wire
• Use solid or stranded conductor AWG14.
• Use copper conductors only.
* Follow local electrical codes.
Note:
When the indoor unit is powered from the outdoor unit, depending on local code, a disconnect switch needs to be installed to a power supply circuit.
1-3-2. REFRIGERANT PIPES
• To prevent condensation, insulate the two refrigerant pipes.
• Refrigerant pipe bending radius must be 4 in. (100 mm) or more.
CAUTION
Be sure to use the insulation of specified thickness (table on the right). Excessive insulation may cause incorrect installation of the indoor unit, and too little insulation may cause
condensate to form.
Electrical specifications
MODEL MSY-GE24NA
INDOOR UNIT
Power supply
(V, PHASE, Hz)
Min. Circuit Ampacity (A) 1.0
Fan motor (F.L.A.) (A) 0.76
OUTDOOR UNIT
Power supply
(V, PHASE, Hz)
Max. Fuse size
(time delay)
Min. Circuit Ampacity (A) 17.1
Fan motor (F.L.A.) (A) 0.93
Compressor
Control voltage
Pipe
For liquid 3/8 (9.52) 0.0315 (0.8) 5/16 (8) Heat resistant foam
For gas 5/8 (15.88) 0.0394 (1.0) 5/16 (8)
(A) 20
(R.L.A) (A) 12.9
(L.R.A) (A) 16.1
Indoor unit - Remote controller: (Wireless)
Indoor unit - Outdoor unit: DC12-24 V (Polar)
Outside
diameter
Minimum
wall thick-
ness
inch (mm)
208/230, 1, 60
208/230, 1, 60
Insulation
thickness
MSZ-FE18NA
MSZ-GE24NA
Insulation material
plastic 0.045 Specific
gravity
• The unit has flared connections on both indoor and outdoor sides.
• Remove the valve cover from the outdoor unit, then connect the pipe.
• Refrigerant pipes are used to connect the indoor and outdoor units.
• Be careful not to crush or over bend the pipe in pipe bending.
• Refrigerant adjustment... If pipe length exceeds 33 ft. (10 m), additional refrigerant
(R410A) charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 33 ft. [10 m])
Limits
Pipe length 100 ft. (30 m) max.
Height difference 50 ft. (15 m) max.
No. of bends 10 max.
Up to 33 ft. (10 m)
Pipe length
Exceeding 33 ft. (10 m)
Refrigerant to be added
MSZ-FE18NA
MSZ-GE24NA
MSY-GE24NA
No additional charge is re-
quired.
Additional charge is required.
(Refer to the table below.)
2.96 oz. each 5 ft. (55 g/m)
Page 3
1-4. INSTALLATION DIAGRAM
ACCESSORIES
Check the following parts before installation.
<Indoor unit>
(1) Installation plate 1
Attachment screws for the installa-
(2)
tion plate
4 × 25 mm
(3) Remote controller holder 1
Screws for the remote controller
(4)
holder
3.5 × 16 mm (Black)
(5) Battery (AAA) for (6) 2
(6) Wireless remote controller 1
Felt tape
(7)
(For left or left-rear piping)
(8) Air cleaning filter 2
FIELD-SUPPLIED PARTS
(A)
Indoor/outdoor unit connecting wire *
(B) Extension pipe 1
(C) Wall hole sleeve 1
(D) Wall hole cover 1
(E) Pipe attachment strap
(F) Screw for (E) 4 × 20 mm
(G) Piping tape 1
(H) Putty 1
Drain hose
(or soft PVC hose, 19/32 in. [15
(I)
mm] inner diameter or hard PVC
pipe VP16)
(J) Refrigerant oil 1
(K) Power supply cord * 1
* Note:
Place indoor/outdoor unit connecting wire (A)
and power supply cord (K) at least 3 ft. (1 m)
away from the TV antenna wire.
7
2
1
1
2 to 5
2 to 5
1 or 2
2-1/8 in. (55
mm) or more/
4-5/8 in. (118 mm)
left back piping
or more for left and
5-7/8 in.
(149 mm)
or more
(using spacer)
4 in.
(100 mm)
or more
Use the wall hole sleeve
(C) to prevent indoor/outdoor connecting wire (A)
from contacting metal
parts in the wall and to
protect the wiring from
rodents.
5-1/2 in.
(140 mm)
or more
3/8 in. (10 mm)
or more
20 in. (500 mm)
or more
(100 mm)
4 in.
or more
Indoor unit
Wall hole
sleeve (C)
Cut off the
extra length.
Wall hole cover (D)
Seal the wall hole
gap with putty (H).
Attach the pipe to
wall with pipe attachment strap (E).
Pipe fixing band
(E)
Fixing
screw (F)
After the leak test, apply insulating material tightly so that there is no gap.
When the piping is to be attached to a wall
comprised of tin plate or metal netting, use
chemically treated wooden piece 25/32 in.
(20 mm) or thicker between the wall and
the piping, or wrap insulation vinyl tape 7
to 8 turns 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.
Outdoor unit installation
Unit: inch
33-1/16
19-11/16
6-7/8
13
15-3/8
2-3/8 x 13/16 slot 1-9/16
Air inlet
13-3/4~14-5/8
Air outlet
Unit: mm
14 in.
(350 mm)
20 in.
(500 mm)
or more
Units should be installed by licensed contractor
according to local code requirements.
Drain piping for outdoor unit
Install the unit horizontally.
Do not use drain socket in cold regions. Drain may freeze and make 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.
or more
175 500
390
330
2-10 x 21 slot
840
Air inlet
Air outlet
40
349~371
Page 4
2. INDOOR UNIT INSTALLATION
2-1. ATTACHING THE INSTALLATION PLATE
• Find a stud in the wall to attach installation plate (1) horizontally on the wall with screws (2).
• To prevent installation plate (1) from vibrating, be sure to install the attachment screws
in the holes indicated in the illustration. For added support, additional screws may also
be installed in other holes.
• When the knockout is removed, apply vinyl tape to the knockout edges to prevent damaging the wires.
• When the indoor unit is to be attached to a concrete wall using recessed bolts, secure
installation plate (1) using 7/16 in. x 13/16 in. · 7/16 in. x 1 in. (11 mm × 20 mm · 11 mm
× 26 mm) oval hole (17-3/4 in. [450 mm] pitch).
• If the recessed bolt is too long, change it for a shorter one (field-supplied).
2-2. DRILLING
1) Determine where the holes will be located on the wall.
2) Drill a ø 3 in. (75 mm) hole. The outdoor side should be 6/32 to 9/32 in. (5 to 7 mm)
lower than the indoor side.
3) Insert wall hole sleeve (C).
2-3. CONNECTING WIRES FOR INDOOR UNIT
Note:
When the indoor unit is powered from the outdoor unit, depending on local code, a disconnect switch needs to be installed to a power supply circuit.
1) Remove the panel assembly. (Refer to 5-1.)
2) Place the upper part of the indoor unit on the installation plate.
3) Remove corner box and electrical cover.
4) Remove display panel, conduit cover and conduit plate.
5) Attach conduit pipe (for rear piping) / elbow joint (for right, left, or downward piping) to
conduit plate with lock nut. The thread of the installed conduit pipe / elbow joint appearing inside should be less than 3/8 in. (10 mm). (Fig. 1) Elbow joint should appear less
than 1-3/16 in. (30 mm) outside. (Fig. 2)
6) Process the end of ground wire (Fig. 3). Connect it to the ground terminal of electrical
parts box.
7) Process the end of indoor/outdoor unit connecting wire (A) (Fig. 3). Attach it to the
terminal block. Be careful not to make mis-wiring. Attach the wire to the terminal block
securely so that its core cannot be seen, and no external force affects the connecting
section of the terminal block.
8) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fas-
tened.
9) Reinstall conduit plate, conduit cover and display panel.
10) According to the piping direction, remove the shaded part of the left side of box (Fig. 4)
or corner box (Fig. 5). Reinstall electrical cover, corner box and panel assembly.
Installation plate (1)
5-7/8 in.
(149 mm)
or more
Wall
Electrical cover
Fixing screw
Display panel
Fixing screw (2)
ø 3 in.
(75 mm)
Conduit cover
Lock nut
Conduit plate
Ceiling
Level
Insert
the
scale. *
Wall
6/32-9/32 in.
(5-7 mm)
Outdoor side
Electrical box
Grounding
terminal
or
Elbow joint
(for right, left, or downward piping)
2 1/8 in. (55 mm) or more
4 5/8 in. (118 mm) or more for left
and left back piping (using spacer)
5 1/2 in.
(140 mm)
or more
4 in.
(100 mm)
Align the
scale with
the line. *
Center of
ø 3 in. (75 mm)
hole
* Same for left hole.
Indoor terminal
block
Conduit pipe
(for rear piping)
Wall
Remark:
* A disconnect switch is required.
Check the local code.
** Use a ring tongue terminal in
order to connect a ground wire
to terminal.
Grounding terminal**
Ground
Power supply
208/230 V AC,
1 phase 2 wires,
60 Hz
208/230 V AC
1 phase, 60 Hz
OUTDOOR
UNIT
Terminal
block 1
Grounding terminal**
INDOOR UNIT
Terminal block
,
Grounding
terminal**
Disconnect
switch*
• Connect wires to the appropriate terminals
• For future servicing, leave some slack in the connecting wires.
Conduit plate
Less than 3/8 in.
(10 mm)
Lock nut
Conduit pipe or
elbow joint
19/32 in.
1-3/8 in.
(35 mm)
Lead
wire
• Make ground wire a little longer than
others. (More than 2-3/8 in. [60 mm])
Remove
panel for piping on bottom
side of unit.
Remove panel
for conduit
pipe on bottom
side of unit.
(15 mm)
Corner box
Remove panel
for piping on
right side of unit.
Conduit plate
Fig. 1 Fig. 2
Fig. 3
Fig. 5
(for right, left, or downward piping)
Remove panel
for piping on
left side of unit.
Less than 1-3/16 in.
(30 mm)
Elbow joint
Remove panel for
piping on bottom
left side of unit.
Box
Fig. 4
Page 5
2-4. PIPE FORMING AND DRAIN PIPING
2-4-1. PIPE FORMING
• Place the drain hose below the refrigerant piping.
• Make sure that the drain hose is not crowded or bent.
• Do not pull the hose when applying the tape.
• When the drain hose passes the room, be sure to wrap it with insulation material (fieldsupplied).
Note:
Make sure not to damage the cover of refrigerant pipe when attaching it back on with
screws.
Left or left-rear piping
Note:
Be sure to reattach the drain hose and the drain cap if the piping is being installed on left
or bottom left of unit, otherwise, water could drip down from the drain hose.
1) Place the refrigerant piping and the drain hose together, then firmly apply felt tape (7)
from the end.
Felt tape (7) overlap width should be 1/3 the tape width. Use a bandage stopper at the
end of felt tape (7).
2) Pull out the drain cap at the back right of the indoor unit. (Fig. 1)
• Hold the convex section at the end and pull the drain cap.
3) Pull out the drain hose at the back left of the indoor unit. (Fig. 2)
• Hold the claw marked by the arrows and pull out the drain hose forward.
4) Put the drain cap into the section to which the drain hose is to be attached at the rear of
the indoor unit. (Fig. 3)
• Insert a screwdriver into the hole on the cap and insert the cap fully into the drain pan.
5) Insert the drain hose fully into the drain pan at the back right of the indoor unit. (Fig. 4)
• Check if the hose is hooked securely to the projection of its inserting part at the drain
pan.
6) Insert the drain hose into wall hole sleeve (C), and attach the upper part of indoor unit
onto the installation plate (1). Then, shift the indoor unit completely to the left to make
placing the piping in the back of the unit easier.
7) Cut out two pieces of cardboard from the shipping box (use any two pieces of the four
pieces), roll each piece, hook them onto the back rib, and use them as spacer to lift the
indoor unit. (Fig. 5)
8) Connect the refrigerant piping with the extension pipe (B).
9) Attach the lower part of the indoor unit into the installation plate (1).
Felt tape (7)
Liquid pipe
Piping tape (G)
Drain cap
Drain cap
Gas pipe
Indoor/outdoor unit
connecting wire (A)
Felt tape (7)
Piping tape (G)
Cut off in case of left piping.
Drain cap
Fig. 1 Fig. 2
Fig. 3
Drain hose
Drain hose
Fig. 4
Rear or bottom piping
1) Place the refrigerant piping and the drain hose together, then firmly apply piping tape (G)
from the end.
2) Insert the piping and the drain hose into the wall hole sleeve (C), and attach the upper
part of the indoor unit on the installation plate (1).
3) Check if the indoor unit is attached securely on the installation plate (1) by moving the
unit to left and right.
4) Attach the lower part of the indoor unit into the installation plate (1).
Right piping
Note:
Before performing the following, make sure that wiring is completed, and the conduit cover
is installed. (Refer to 2-3.)
1) Place the refrigerant piping and the drain hose together, shift them to left side of the
unit, and then firmly apply piping tape (G) from the end.
2) Insert the piping and the drain hose into the wall hole sleeve (C), and attach the upper
part of the indoor unit on the installation plate (1).
3) Check if the indoor unit is attached securely on the installation plate (1) by moving the
unit to left and right.
4) Attach the lower part of the indoor unit into the installation plate (1).
2-4-2. DRAIN PIPING
• If the extension drain hose has to pass through a room, be sure to wrap it with insulation (field-supplied).
• The drain hose should point downward for easy drain. (Fig. 1)
• If the drain hose provided with the indoor unit is too short, connect it with a fieldsupplied drain hose (I). (Fig. 2)
• When connecting the drain hose to a hard vinyl chloride pipe, be sure to insert it
securely into the pipe. (Fig. 3)
Fig. 5
Remove panel for piping on
bottom side of unit
Remove panel
for piping on
right side of
unit
To the left
Drain hose
Hard vinyl chloride pipe
I.D. 1-3/16 in.
(30 mm)
Insert
securely
Downward
slope
Drain
hose
Soft hose I.D.
19/32 in.
(15 mm)
27-9/16 in.
(70 cm)
or more
Different
diameter joint
Fig. 1 Fig. 2 Fig. 3
Do not make drain piping as shown below.
Accumulated
drain water
Air
Waving
Water
leakage
Do not raise
Water
leakage
Water
leakage
Tip of drain
hose dipped
in water
Ditch
At least
1-31/32 in.
(50 mm)
gap
Page 6
3. OUTDOOR UNIT INSTALLATION
3-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Remove the conduit cover.
3) Attach the conduit connector to conduit plate with lock nut then secure it against unit
with screws.
4) Connect ground wires of indoor/outdoor unit connecting wire (A) and power supply cord
(K) to the terminal block.
5) Loosen the terminal screw, and attach indoor/outdoor unit connecting wire (A) from the
indoor unit correctly on the terminal block. Attach the wire to the terminal block securely
so that its core cannot be seen, and no external force affects the connecting section of
the terminal block.
6) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fastened.
7) Connect power supply cord (K).
8) Install the conduit cover.
9) Install the service panel securely.
Service panel
Lock nut
Conduit pipe
1-3/8 in.
(35 mm)
Lead
wire
TB support
5/8 in.
(15 mm)
Terminal block
to conduit cover
L1
Power supply cord (K)
Grounding
terminal
Indoor/outdoor unit
connecting wire (A)
Power supply cord (K)
L2
Conduit cover
Conduit
plate
3-2. FLARE CONNECTION
1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)
2) Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to
avoid getting metal shavings into the piping. (Fig. 3)
3) Remove flare nuts attached to indoor and outdoor units, then put them on pipe.
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the table.
Select A inch (mm) from the table according to the tool you use.
5) Check
• Compare the flared work with Fig. 6.
• If flare is defective, cut off the section and repeat procedure.
Pipe diameter
inch (mm)
Nut
inch
(mm)
ø 1/4 (6.35) 1/4 (17)
ø 3/8 (9.52) 3/8 (22)
ø 1/2 (12.7) 1/2 (26)
ø 5/8 (15.88) 5/8 (29)
Clutch
type tool
for R410A
0 to 0.02
(0 to 0.5)
A inch (mm) Tightening torque
Clutch
type tool
for R22
0.04 to
0.06
(1.0 to 1.5)
Wing nut
type tool
for R22
0.06 to
0.08
(1.5 to 2.0)
0.08 to
0.10
(2.0 to 2.5)
N•m
13.7 to
17.7
34.3 to
41.2
49.0 to
56.4
73.5 to
78.4
lbf•ft
(kgf•cm)
10 to 13
(140 to
180)
25 to 30
(350 to
420)
36 to 42
(500 to
575)
54 to 58
(750 to
800)
Flaring tool
Clutch type
Smooth all around
Burr
• Make ground wire a little longer than others. (More than 3-7/8 in. [100 mm])
• For future servicing, leave some slack in
the connecting wires.
Good
Copper
pipe
Tilted
Fig. 1 Fig. 2
Copper pipe
Spare reamer
Pipe cutter
Wing nut type
Fig. 4
Inside is shining without any
scratches.
Die
Flare nut
No good
Uneven Burred
Fig. 3
Copper pipe
Fig. 5
Even length
all around
Fig. 6
Page 7
3-3. PIPE CONNECTION
• Fasten flare nut with a torque wrench as specified in the table above.
• When fastened too tight, flare nut may eventually break and cause refrigerant leakage.
Indoor unit connection
Connect both liquid and gas piping to indoor unit.
• Apply a thin coat of refrigerant oil (J) on the seat surface of pipe.
• To connect, first align the center, then tighten the first 3 to 4 turns of flare nut.
• Use tightening torque table in (3-2.) as a guideline for indoor unit side joints, and tighten
using two wrenches. Excessive tightening damages the flare section.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit following the same procedure
detailed in Indoor unit connection.
• For tightening, use a torque wrench or spanner.
WARNING
When installing the unit, securely connect the refrigerant pipes before starting the
compressor.
3-4. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, insulate the piping, including valves.
3) Apply piping tape (G) starting from the connection on the outdoor unit.
• When piping has to be installed through a ceiling, closet or where the temperature and
humidity are high, use additional field-supplied insulation to prevent condensation.
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 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 15 minutes or more.
4) Check the vacuum with the gauge manifold valve, then close it and shut off the vacuum
pump.
5) Leave as it is for one or two minutes. Make sure pointer gauge manifold valve remains
in the same position. Confirm that pressure gauge shows –0.101 MPa [Gauge] (–30
in.Hg [–760 mmHg]).
6) Quickly remove gauge manifold valve from service port of stop valve.
7) After refrigerant pipes are connected and evacuated, fully open all stop valves on both
sides of gas pipe and liquid pipe. Operating the unit without fully opening the valves
lowers the performance and causes problems.
8) Refer to 1-3. SPECIFICATIONS, 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.
10) Conduct a leak test
*4 to 5 turns
*Open
Hexagonal wrench
Service port cap
(Torque 13.7 to
17.7 N•m, 10 to 13
lbf•ft [140 to 180
kgf•cm])
Precautions when using the control valve
Control valve
*Close
Open
A
Stop valve cap
(Torque 19.6 to
29.4 N•m, 15 to
22 lbf•ft [200 to
300 kgf•cm])
Close
Body
Stop valve
for LIQUID
Service port
Charge hose
–0.101 MPa
(–30 in.Hg
[–760 mmHg])
Handle
Low
Stop valve for
GAS
Adapter for preventing the back
flow
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.
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.
Compound pressure gauge
(for R410A)
Pressure gauge
(for R410A)
Gauge manifold valve
(for R410A)
Handle High
Charge hose
(for R410A)
Vacuum pump (or the vacuum
pump with the function to
prevent the back flow)
4-2. TEST RUN
1) Insert power supply plug into the power outlet and/or turn on
the breaker.
2) Press the E.O. SW once. Test run will be performed for 30
minutes. If the left operation indicator light blinks every 0.5
seconds, inspect the indoor/outdoor unit connecting wire
(A). After the test run, emergency COOL mode (75°F [24°C]
COOL) will start.
3) To stop operation, press the E.O. SW several times until all
LED lamps turn off. Refer to operating instructions for details.
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller and listen for an audible indicator from
the indoor unit. Press the ON/OFF button again to turn the air conditioner off.
• Once the compressor stops, the restart preventive device operates so the compressor
will not operate for 3 minutes to protect the air conditioner.
Emergency
operation switch
(E.O. SW)
4-3. AUTO RESTART FUNCTION
This product is equipped with an auto restart function. When the power supply is cut off
during operation, such as during blackouts, the function automatically starts operation in
the previous setting once the power supply is resumed. (Refer to the operating instructions
for details.)
Caution:
• After test run or remote signal reception check, turn off the unit with the E.O. SW
or the remote controller before turning off the power supply. If this procedure is
not performed, the unit will automatically begin operation when power supply is
resumed.
To the user
• After installing the unit, explain to the user about auto restart function.
• If auto restart function is unnecessary, it can be deactivated. Consult the service
representative to deactivate the function. Refer to the service manual for details.
4-4. EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air
conditioner (the remote controller, removing the air filters, placing or removing the remote controller from the remote controller holder, cleaning methods, precautions for
operation, etc.)
• Recommend that the user read the OPERATING INSTRUCTIONS carefully.
Page 8
5. RELOCATION AND MAINTENANCE
5-1. REMOVING AND INSTALLING THE PANEL ASSEMBLY
Removal procedure
1) Remove the three screws that attach the panel assembly.
2) Remove the panel assembly. Be sure to remove its bottom end first.
Installation procedure
1) Install the panel assembly following the removal procedure in reverse.
2) Be sure to press the positions as indicated by the arrows in order to attach the assembly completely to the unit.
5-2. REMOVING THE INDOOR UNIT
Remove the bottom of the indoor unit from the installation plate.
When releasing the corner part, release both left and right bottom corner part of indoor unit
and pull it downward and forward as shown in the figure on the right.
If the above method cannot be used
Remove the panel. Then, insert hexagonal wrenches into the square holes on the left and
right sides of the unit and push them up as shown in the following figure. The bottom of the
indoor unit lowers and releases the hooks.
5-3. PUMPING DOWN
When relocating or disposing of the air conditioner, pump down the system following the
procedure below so that refrigerant is not released into the atmosphere.
1) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe
side of the outdoor unit.
2) Fully close the stop valve on the liquid pipe side of the outdoor unit.
3) Close the stop valve on the gas pipe side of the outdoor unit almost completely so that
it can be easily closed fully when the pressure gauge shows 0 MPa [Gauge] (0 lbf/in.
2
]).
kgf/cm
4) Start the emergency COOL operation.
To start the emergency operation in COOL mode, disconnect the power supply plug
and/or turn off the breaker. After 15 seconds, connect the power supply plug and/or turn
on the breaker, and then press the E.O. SW once. (The emergency COOL operation
can be performed continuously for up to 30 minutes.)
Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure
5)
gauge shows 0.05 to 0 MPa [Gauge] (approx. 7.25 to 0 lbf/in
6) Stop the emergency COOL operation.
To stop operation, press the E.O. SW several times until all LED lamps turn off. Refer to
operating instructions for details.
WARNING
When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes. The compressor may burst if air etc. get into it.
2
[0.5 to 0 kgf/cm2]).
2
[0
Square hole
Push
Lower
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO
100-8310, JAPAN
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