Mitsubishi Electric Mr. Slim MSZ-GA24NA User manual

JG79A169H01
MSZ-GA24NA
ELECTRIC
SPLIT-TYPE AIR CONDITIONERS
INSTALLATION MANUAL
When installing multi units, refer to
the installation manual of the multi
unit for outdoor unit installation.
Required Tools for Installation
Phillips screwdriver 5/32 in. (4 mm) hexagonal
Level wrench
Scale Flare tool for R410A
Utility knife or scissors Gauge manifold for R410A
3 in. (75 mm) hole saw Vacuum pump for R410A
Torque wrench Charge hose for R410A
Wrench (or spanner) Pipe cutter with reamer
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.
A WARNING (Could lead to death or serious injury.)
Hf Do not install the unit by yourself (user). Mf Securely attach the electrical cover to the indoor unit and the service panel to
Improper or incomplete installation could cause fire, electric shock, injury due to the outdoor unit.
the unit falling, or water leakage. Consult a qualified installer or the dealer from If the electrical cover of the indoor unit and/or the service panel of the outdoor unit are
whom you purchased the unit. not attached securely, dust, water, etc. could collect in the unit and could cause a fire or
Hf Follow the instructions detailed in the installation manual. an electric shock.
Incomplete installation could cause fire or electric shock, injury due to the unit fall- | i When installing or relocating the unit, make sure that no substance other than
ing, or leakage of water. the specified refrigerant (R416A) enters the refrigerant circuit.
Hf Install the unit securely in a place that can bear the weight of the unit. Any foreign substances in the refrigerant circuit can cause abnormal pressure rise
If the installation location cannot bear the weight of the unit, the unit could fall or an explosion.
causing injury. Hf Do not discharge the refrigerant into the atmosphere. Check that the refrigerant gas
Hf Perform electrical work according to the installation manual and be sure to use does not leak after installation has been completed. If refrigerant leaks during
an exclusive circuit. Do not connect other electrical appliances to the circuit. installation, ventilate the room.
lf the capacity of the power circuit is insufficient or there is incomplete electrical lf refrigerant comes in contact with a fire, harmful gas could be generated.
work, it could result in a fire or an electric shock. If refrigerant gas leaks indoors, and comes into contact with the flame of a fan
Hf Ground the unit correctly. heater, space heater, stove, etc., harmful gases will be generated.
Do not connect the ground wire to a gas pipe, water pipe, lightning rod or tel- Mf Use appropriate tools and piping materials for installation.
ephone ground. Defective grounding could cause electric shock. The pressure of R410A is 1.6 times higher than R22. Not using the appropriate
Hf Do not damage the wires. tools and materials, or improper installation could cause the pipes to burst causing
Damaged wires could cause fire. an injury.
Hf Be sure to shut off the main power when setting up the indoor P.C. board or Hi When pumping down the refrigerant, stop the compressor before disconnecting
wiring. the refrigerant pipes.
Failure to do so could cause electric shock. If the refrigerant pipes are disconnected while the compressor is running and the
lf Use the specified wires to securely connect the indoor and outdoor units. At- stop valve is open, air could be drawn in and the pressure in the refrigeration cycle
tach the wires firmly to avoid applying stress to the terminal block. could become abnormally high, causing the pipes to burst.
Improper connection could cause fire. Hi When installing the unit, securely connect the refrigerant pipes before starting
Hf Do not install the unit in a place where flammable gas may leak. the compressor.
If gas leaks and accumulates around the unit, it could cause an explosion. If the compressor is started before the refrigerant pipes are connected and the
Hf Do not use intermediate connection of the power cord or the extension cord. stop valve is open, air could be drawn in and the pressure in the refrigeration cycle
Do not connect many devices to one AC outlet. could become abnormally high, causing the pipes to burst.
It could cause a fire or an electric shock. Mf Fasten a flare nut with a torque wrench as specified in this manual.
Mf Use the parts provided or specified parts for the installation work. If fastened too tight, a flare nut could break and cause refrigerant leakage.
The use of defective parts could cause an injury or leakage of water due to a fire, Hf Install the unit according to national wiring regulations.
an electric shock, the unit falling, etc.
Hf 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.
A CAUTION (Could lead to serious injury when operated incorrectly.)
Hf Depending on the installation area, install a Ground Fault Interrupt (GFI) circuit I Do not touch the air inlet or the aluminum fins of the outdoor unit.
breaker. This could cause injury.
If the Ground Fault Interrupt (GFI) circuit breaker is not installed, an electric shock li Do not install the outdoor unit where small animals may live.
could occur. If small animals enter the unit and damage its electrical parts, it could cause a
@ Perform the drainage/piping work securely according to the installation malfunction, smoke emission, or fire. Keep the area around the unit clean.
manual.
lf there is defect in the drainage/piping work, water could drip from the unit, and
damage household items.

1-2. SELECTING THE INSTALLATION LOCATION
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 re- «
quired 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 dis-
tribute over the entire room.
Note:
received.
sound or hot air.
In rooms where inverter type fluorescent lamps are used,
the signal from the wireless remote controller may not be
OUTDOOR UNIT
Where it is not overly exposed to strong winds.
Where airflow is good and dustless.
Where neighbours are not annoyed by operation
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 re-
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.
affected device.
Install the unit horizontally.
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.
Z\ CAUTION
Be sure to use the insulation of specified thickness (table on the right). Excessive insula-
tion may cause incorrect installation of the indoor unit, and too little insulation may cause
condensate to form.
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 25 ft. (7.5 m), additional refrigerant
(R410A) charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 25 ft. [7.5 m])
ception is weak. An amplifier may be required for the
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.
Electrical specifications
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 tem-
perature, 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 a baffle
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.
MODEL MSY-GA24NA MSZ-GA24NA
Power supply
(V, PHASE, Hz) 208/230, 1, 60
Min. Circuit Ampacity (A) 1.0
Fan motor (F.L.A.) (A) 0.76
Power supply
(V, PHASE, Hz) 208/230, 1, 60
Max. Fuse size
(time delay) (A) 20
Min. Circuit Ampacity (A) 17
Fan motor (F.L.A.) (A) 0.93
(R.L.A) (A) 12.8
Compressor
(L.R.A) (A) 16
Control voltage Indoor unit - Remote controller: (Wireless)
9 Indoor unit - Outdoor unit: DC12-24 V (Polar)
Outside Minimum Insulation
: diameter wall thick thickness : :
Pipe ness Insulation material
inch (mm)
For liquid 1/4 (6.35) 0.0315 (0.8) | 5/16 (8) Heat resistant foam
plastic 0.045 Specific
For gas 5/8 (15.88) | 0.0394 (1.0) | 5/16 (8) gravity
Limits
Pipe length 100 ft. (80 m) max.
Height difference 50 ft. (15 m) max.
No. of bends 10 max.
Up to 25 ft. (7.5 m) No additional charge is re-
quired.
Pipe length
Exceeding 25 ft. (7.5 m)
Additional charge is required.
(Refer to the table below.)
Refrigerant to be added
MSZ-GA24NA
1.08 oz. each 5 ft. (20 g/m)
MSY-GA24NA

1-4. INSTALLATION DIAGRAM
ACCESSORIES
Check the following parts before installation.
<[ndoor unit>
(For left or left-rear piping)
(1) |Installation plate 1
Attachment screws for the installa-
(2) |tion plate 7
4x25mm
(3) |Remote controller holder 1
Screws for the remote controller
(4) [holder 2
3.5 x 16 mm (Black)
(5) {Battery (AAA) for (6) 2
(6) |Wireless remote controller 1
(7) Felt tape 4
(8) |Air cleaning filter 2
FIELD-SUPPLIED PARTS
(A) | Indoor/outdoor unit connecting wire * 1
(B) | Extension pipe 1
(C) | Wall hole sleeve 1
(D) | Wall hole cover 1
(E) | Pipe attachment strap 2to5
(F) | Screw for (E) 4 x 20 mm 2to5
(G) | Piping tape 1
(H) | Putty 4
Drain hose
(I) (or soft PVC hose, 19/32 in. [15 4
mm] inner diameter or hard PVC
pipe VP 16)
(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.
according to local code requirements.
Units should be installed by licensed contractor
2-7/8
in.
(72
mm)
or
more/
4
in.
(100
mm)
or
more
for
left
and
left
back
piping
(using
obstruct
the air
5/16
in.
(7
mm
20 in. (600 mm)
or more
Use the wall hole sleeve
(C) to prevent indoor/out-
door connecting wire (A)
from contacting metal
parts in the wall and to
protect the wiring from
rodents.
Wall hole cover (D)
Ane
aks
Fate Seal the wall hole
A, gap with putty (H).
Indoor unit
Wall hole
sleeve (C) Attach the pipe to
bt wall with pipe at-
\ tachment strap (E).
Cut off the
extra length. —.,_ Pipe attachment
strap (E).
Fixing screw (F)
After the leak test, apply insulating mate-
rial tightly so that there is no gap.
Space for indoor unit working
Please leave the space as shown in the
picture for maintenance usage.
7 installation 8
Indoor unit plate N
4
\
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
6-5/8 19-11/16
ay Afr inlet ale
g g
Fo 3
a =
Fo Alr outlet -
4-3/8 x 13/16 slot 1-18/32
Unit: mm
840
169 500
ed Airinlet ala
NiO Q
1? o
OD EOD oD
Oy Air outlet -
4-10 x 21 slot 40

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 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 x 20 mm: 11 mm
x 26 mm) oval hole (17-3/4 in. [450 mm] pitch).
+ Ifthe 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 @ 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, a disconnect switch may need to
be installed to power supply circuit (between indoor and outdoor unit) depending on local
code.
1) Remove the front panel. (Refer to 5-1.)
2) Hook the upper part of the indoor unit on the installation plate.
3) Remove electrical cover.
4) Remove SW TB cover.
5) Remove corner box.
6) Remove display panel and conduit cover.
7) Fix conduit pipe (for rear piping) / elbow joint (for right, left, or downward piping) to con-
duit plate with lock nut. The thread part of installed conduit pipe / elbow joint appearing
inside should be less than 3/8 in. (10 mm). (Fig. 1) Elbow joint should appear less than
4-3/16 in. (30 mm) outside. (Fig. 2)
8) Process the end of ground wire (Fig. 3). Connect it to the ground terminal of electrical
parts box.
9) Process the end of indoor/outdoor unit connecting wire (A) (Fig. 3). Fix it to 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.
10) Firmly tighten the terminal screws to prevent them from loosening. After tightening, pull
the wires lightly to confirm that they do not move.
11) Reinstall display panel and conduit cover.
12) According to the piping direction, cut off the shaded part of the left side of box (Fig. 4)
or corner box (Fig. 5).
13) Reinstall SW TB cover.
14) Reinstall electrical cover.
15) Reinstall front panel.
Remark:
: ah i . INDOOR UNIT .
* A disconnect switch is required. Grounding
Check the local code. Terminal block J terminal**
** Use a ring tongue terminal in
order to connect a ground wire isis2s3
to terminal. ,
__ Disconnect
switch*
208/230 V AC -
iphase, 60 Hz
OUTDOOR UNIT
208/230 VAC, {77°
1phase 2 wires, |—io>cH]
60 Hz
Power supply rot
Ground Grounding terminat"*
Bind the line to the center hole.
_—
4-3/4 in.
(120 mm)
or more
“Ealing “Z
2-7/8 in. (72 mm) or more
Ain. (100 mm) or more for left and
left back piping (using spacer)
7-7/8 in.
(200 mm)
|] or more
aA
=
Align the plumb
line with the
mark \/.
Attachment
screw (2)
a = |
ae
: Los
1
Insert a "
the ign the
scale. * scale with Center of
the line.* |? 3 in. (75 mm)
hole
gy Plumb
* Same for left hole.
Electrical cover
SW TB cover
Indoor terminal
block
* Connect wires to the matching
numbers of terminals.
¢ For future servicing, give extra
length to the connecting wires.
Electrical
a _-~- box
\
&
\
Conduit
_-~ plate
Conduit
pipe
(for rear
; { piping)
2 < i
Lock nut a : or
Elbow joint a
(for right, left, or downward piping)
Grounding
terminal
Conduit plate
Lock nut
sam)
Less than 1-3/16 in.
{30 mm)
Elbow joint
(for right, left, or downward piping) Fig. 2
Conduit pipe or
elbow joint
Fig. 1
| 5/8 in.
2-3/16 in. (15 mm)
(55 mm)
Lead 4
wire
+ Make ground wire a little longer than
others. (More than 1-9/16 in. [40 mm])
Fig. 3
Cut off in Box
case of left
piping
Cut off in case of
left-downward piping
Fig. 4
Corner box
Cut off in case of
downward piping
Cut off in case of
right piping Fig. 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 (field-
supplied).
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 a part of packing material, hook it onto the back rib, and use it as a 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).
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
Liquid pipe
Gas pipe
indoor/outdoor unit
= connecting wire (A)
Felt tape (7)
Piping tape (G)
Remove panel for piping on
left side of unit.
Felt tape
ps
~ Drain hose
Fig. 1 Fig. 2
Drain hose
Drain cap
Fig. 3 Fig. 4
=
SQ
Re
a
NN f
ig. 5
Cut off in case of downward piping.
Cut off in
case of
right piping.
. 7 To the left
unit to left and right.
4) Attach the lower part of the indoor unit into the installation plate (1).
2-4-2. DRAIN PIPING O " "
+ Ifthe extension drain hose has to pass through a room, be sure to wrap it with in- . pain Drain hose —
sulation (field-supplied), re 27-9/16 in. [~~ Fara viny chloride pipe
* The drain hose should point downward for easy drain. (Fig. 1) Downward 2 (70 cm) ae :
* {f the drain hose provided with the indoor unit is too short, connect it with a field- slope * — Soft hose |.D. or more
supplied drain hose (I). (Fig. 2) bth. 19/32 in.
* When connecting the drain hose to a hard vinyl chloride pipe, be sure to insert it 7S I (15 mm) Different 7”
securely into the pipe. (Fig. 3) FV diameter joint
Fig. 1 Fig. 2
| Do not make drain piping as shown below. |
Do not raise rAccumulated At least /
drain water Tip of drain (50 may
Water
leakage
hose dipped
in water
) gap
wer Iae +
Water
La i
Al ely
leakage Y-~ Ditch
Waving
leakage

3-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Remove the conduit cover.
3) Attach the conduit connector to conduit cover 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 TB support.
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 fas-
tened.
7) Connect power supply cord (kK).
8) Install the conduit cover.
9) Install the service panel securely.
1-3/8 in.
(35 mm)
Lead
wire
5/8 in.
4 (15 mm)
Power supply cord (K)
Service panel Lock nut
Conduit cover
Connector Terminal block Power supply cord (K)
ag, indoor/outdoor unit
~~ connecting wire (A)
oe-7 to conduit cover
+ Make ground wire a little longer than oth-
ers. (More than 1-3/8 in. [35 mm])
+ For future servicing, leave some slack in
rounding TB support the connecting wires.
ermimna
Ainch (mm) Tightening torque Good No good
. : Nut °
Pipe diameter | soy Clutch Clutch Wing nut felb a
inch
(mm)
(mm)
|
type
tool
|
type
tool
|
type
tool
Nem
(kgf«om)
wee
Copper
~
for R410A | for R22 | for R22 9 pipe
10 to 13 :
1/4 13.7 to Tilted Uneven Burred
@ 1/4 (6.35) (140 to : .
(17) 9.06 to 177 Fig. 4 Fig. 2
0.08 180) 9 g
(1.5 to 25 to 30
3/8 2.0) 34.3 to
9 318 (9.52) | (9) 0.04 to a2 | Coe Burr Copper pipe
0 to 0.02 0.06 x .— Spare reamer
(0 to 0.5) (1.0 to 36 to 42 \ » WK Pipe cutter » I
ot2 (127) | 12 1.5) 49.0 to | (600 to | |
, (26) 0.08 to 56.4 575
0.10 ) ria. 3
5/8 wey | 735t0 | 241098 *
@ 5/8 (15.88) 5) (750 to
(29) 78.4 800) A
3-2. FLARE CONNECTION
1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2) |---- Copper pipe
2) Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to e Die
avoid getting metal shavings into the piping. (Fig. 3) Clutch type Wing nut type
3) Remove flare nuts attached to indoor and outdoor units, then put them on pipe. Fig. 4 Flare nut Fig. 5
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 you use. Inside is shi
5) Check Smooth all around inside is snin-
. . ing without any
+ Compare the flared work with Fig. 6. scratches.
+ If flare is defective, cut off the section and repeat procedure.
Even length
all around Fig. 6
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 above 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.
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.

4-1. PURGING PROCEDURES AND LEAK TEST “0.101 MPa Compound pressure gauge
* 30} j for R410A
1) Remove service port cap of stop valve on the side of the outdoor unit gas pipe. 4 to 5 turns Stop valve cap 760 ie " ( )
2) Connect gauge manifold valve and vacuum pump to service port of stop valve on the *Close Crue foe io g / Pressure gauge
gas pipe side of the outdoor unit. n : ‘, Stop valve (for R410)
. ‘Open f to 300 kgfrcm) fr LIQUID ,
3) Run the vacuum pump 15 minutes or more. . Gauge manifoid valve
(for R410A)
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 Hexagonal wrench
in the same position. Confirm that pressure gauge shows -0.101 MPa [Gauge] (~30
in.Hg [~760 mmHg)).
Handle High
— Charge hose
(for R410A)
CPt
6) Quickly remove gauge manifold valve from service port of stop valve. Service port cap if”
7) After refrigerant pipes are connected and evacuated, fully open all stop valves on both (Torque 13.7 to ot—y
sides of gas pipe and liquid pipe. Operating the unit without fully opening the valves 17.7 Nem, 140 to Adapter for pre. ///1puiiit//
180
kgf*cm)
yenting
the
back
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 [Precautions when using the control valve] 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.
Vacuum pump (or the vacuum
pump with the function to
prevent the back flow)
1 g When attaching the control valve to
/ Service port the service port, make sure that the
Contro! vane valve core is in closed position, and
= then tighten part A. Do not tighten
Open ch Charge hose part Aor turn the body when valve
ose Body g core is in open position.
4-2. TEST RUN
1) Insert power supply plug into the power outlet and/or \
turn on the breaker. eee
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 con-
necting 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 instruc-
tions for details.
Emergency operation switch
(E.0. SW)
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 compres-
sor will not operate for 3 minutes to protect the air conditioner.
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 opera-
tion 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 con-
ditioner (the remote controller, removing the air filters, placing or removing the remote
controller from the remote controller holder, cleaning methods, precautions for opera-
tion, etc.)
* Recommend that the user read the OPERATING INSTRUCTIONS carefully.

5-1. REMOVING AND INSTALLING THE PANEL ASSEMBLY
Removal procedure
1) Remove the 3 screws which fix the panel assembly.
2) Remove the panel assembly. Be sure to remove its bottom end first.
Installation procedure
1) Point the horizontal vane slightly downward. (Fig. 1)
2) Attach the bottom of the front panel under the horizontal vane.
Fit in the top of the front panel.
Fit in the bottom of the front panel and tighten it using screws.
Push the section of the front panel marked by the arrows to close the front panel se-
curely.
3
4
5
5-2. REMOVING THE INDOOR UNIT
Remove the bottom of the indoor unit from the installation plate.
1) Remove the front panel. (Refer to 5-1)
2) Insert flat screwdrivers into the square holes at the left and right bottom of the indoor
unit and push them up; the bottom of the indoor unit goes down and the hooks are
released.
*1 Remove the screw.
*2 Remove the tab of corner box from the indoor unit, and pull the corner box.
*3 Pull the indoor unit to remove.
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
Ibffin.” [0 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 op-
eration can be performed continuously for up to 30 minutes.)
5) Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure
gauge shows 0.05 to 0 MPa [Gauge] (approx. 7.25 to 0 Ibf/in® [0.5 to 0 kgfcm’)).
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.
Horizontal vane Fig. 2
Corner
box
yp
Push Lower
Square hole
#. MITSUBISHI ELECTRIC CORPORATION
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO
100-8310, JAPAN