Mitsubishi Electric Mr.SLIM MSY-A24NA User manual

SG79Y963H03 Required Tools for Installation
Phillips screwdriver 5/32 in. (4 mm) hexagonal wrench
z MITSUBISHI Level Flare tool for R410A
ol ELECTRIC Model names are indicated in 1-3. Scale . Gauge manifold for R410A
2 When installing multi units, refer to Utility knife or scissors Vacuum pump for R410A
jm SPLIT-TYPE AIR CONDITIONERS the installation manual of the muiti 3 in. (75 mm) hole saw Charge hose for R410A
INSTALLATION MANUAL unit for outdoor unit installation Torque wrench Pipe cutter with reamer
: Wrench (or spanner)
7. 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.
* 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, serious injury, etc.)
@ Do not install the unit by yourself (user). @ Attach the electrical cover to the indoor unit and the service panel to the outdoor
Incomplete installation could cause fire or electric shock, injury due to the unit fall- unit securely.
ing, or leakage of water. Consult the dealer from whom you purchased the unit or If the electrical cover of the indoor unit and/or the service panel of the outdoor unit are
a qualified installer. not attached securely, it could result in a fire or an electric shock due to dust, water, etc.
@ Perform the installation securely referring to the installation manual. @ When installing or relocating the unit, make sure that no substance other than
Incomplete installation could cause fire or electric shock, injury due to the unit fall- the specified refrigerant (R410A) enters the refrigerant circuit.
ing, or leakage of water. Any presence of foreign substance such as air can cause abnormal pressure rise
@ Install the unit securely in a place which can bear the weight of the unit. or an explosion.
Hf the installation location cannot bear the weight of the unit, the unit could fall @ Do not discharge the refrigerant into the atmosphere. if refrigerant leaks during
causing injury. installation, ventilate the room.
@ Perform electrical work according to the installation manual and be sure to use Hf refrigerant comes in contact with a fire, harmful gas could be generated.
an exclusive circuit. Do not connect other electrical appliances to the circuit. @ Check that the refrigerant gas does not leak after installation has been com-
lf the capacity of the power circuit is insufficient or there is incomplete electrical pleted.
work, it could result in a fire or an electric shock. lf refrigerant gas leaks indoors, and comes into contact with the flame of a fan
& Ground the unit correctly. heater, space heater, stove, etc., harmful substances will be generated.
Do not connect the ground to a gas pipe, water pipe, lightning rod or telephone @ Use appropriate tools and piping materials for installation.
ground. Defective grounding could cause electric shock. The pressure of R4710A is 1.6 times more than R22. Not using appropriate tools or
@ Do not damage the wires by applying excessive pressure with parts or materials and incomplete installation could cause the pipes to burst or injury.
screws. @ When pumping down the refrigerant, stop the compressor before disconnecting
Damaged wires could cause fire. the refrigerant pipes.
@ Be sure to cut off the main power in case of setting up the indoor P.C. board lf the refrigerant pipes are disconnected while the compressor is running and the
or wiring works. stop valve is open, air could be drawn in and the pressure in the refrigeration cycle
Failure to do so could cause electric shock. could become abnormally high. This could cause the pipes to burst or injury.
& Use the specified wires to connect the indoor and outdoor units securely and & Wheninstalling the unit, securely connect the refrigerant pipes before starting
attach the wires firmly to the terminal block connecting sections so the stress the compressor.
of the wires is not applied to the sections. lf the compressor is started before the refrigerant pipes are connected and when
Incomplete connecting and securing could cause fire. the stop valve is open, air could be drawn in and the pressure in the refrigeration
@ Do not install the unit in a place where inflammable gas may leak. cycle could become abnormally high. This could cause the pipes to burst or injury.
lf gas leaks and accumulates in the area around the unit, it could cause an explo- @ Fasten a flare nut with a torque wrench as specified in this manual.
sion. Hf fastened too tight, a flare nut may break after a long period and cause refrigerant
@ Do not use intermediate connection of the power cord or the extension cord leakage.
and do not connect many devices to one AC outlet. @ The unit shall be installed in accordance with national wiring regulations.
It could cause a fire or an electric shock due to defective contact, defective insula-
tion, exceeding the permissible current, etc.
@ 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.
@ 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 ouilet, it could
cause electric shock or fire. Ifloose parts are found on the power supply plug, replace it.
AX CAUTION (Could lead to serious injury in particular environments when operated incorrectly.)
@ Install a Ground Fault Interrupt (GF) circuit breaker depending on the instal- MH Do not touch the air inlet or the aluminum fins of the outdoor unit.
lation place. This could cause injury.
lf the Ground Fault Interrupt (GFI) circuit breaker is not installed, it could cause @ Do not install the outdoor unit where small animals may live.
electric shock. If small animals enter and touch the electric parts inside the unit, it could cause a
@ Perform the drainage/piping work securely according to the installation malfunction, smoke emission, or fire. Also, advise user to keep the area around
manual. the unit clean.
Hf there is defect in the drainage/piping work, water could drop from the unit, soak-
ing and damaging household goods.

1-2. SELECTING THE INSTALLATION LOCATION
* Where airflow is not blocked.
+ Where cool air spreads over the entire room.
« Rigid wall without vibration.
+ Where it is not exposed to direct sunshine.
Note:
received.
+ Where easily drained. + Where itis not exposed to strong wind.
* Ata distance 3 ft. (1 m) or more away from your TV + Where airflow is good and dustless.
and radio. Operation of the air conditioner may inter- * Where neighbours are not annoyed by operation
fere with radio or TV reception. An amplifier may be sound or hot air.
required for the affected device. + Where rigid wall or support is available to prevent the
* Ina 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 filler can be removed and replaced easily. secure the unit legs.
Note: .
Install indoor unit at a high position on the wall where air
can distribute over the entire room.
REMOTE CONTROLLER
* Where itis easy to operate and easily visible. affected device.
* Where children cannot touch it. * Install the unit horizontally.
* Select a position about 4 ft. (1.2 m) above the floor .
and check that signals from the remote controller are
surely received by the indoor unit from that position
(beep’ or ‘beep beep’ receiving tone sounds). After
that, attach remote controller holder to a pillar or wall
and install wireless remote controller.
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.
* Screws should be tightened so they will not loosen.
Connecting wires and connecting ground wire
* Use solid conductor AWG14 or stranded conductor AWG14.
* Use double insulated copper wire with GOOV insulation.
* Use copper conductors only.
* Follow local electrical code.
Power supply cable and ground wire
* Use solid or stranded conductor AWG14.
* Use copper conductors only.
* Follow local electrical code.
Note:
When the indoor unit is powered from the outdoor unit, a disconnect switch needs to be
installed to power supply circuit (between indoor and outdoor unit) depending on local
code.
1-3-2. REFRIGERANT PIPES
a ee
increase of operation sound or vibration.
Where there is no risk of combustible gas leakage.
When installing the unit at a high level, be sure to
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
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:
In rooms where inverter type fluorescent lamps are used, +
the signal from the wireless remote controller may not be
.
OUTDOOR UNIT
Itis advisable to make a piping loop near outdoor unit
so as to reduce vibration transmitted from there.
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 tempera-
ture, 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, itis 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.
* Salty places such as the seaside.
* Where sulfide gas is generated such as a hot
spring.
* Where there is high-frequency or wireless equipment.
Electrical specifications
MODEL
Power supply (V, PHASE, Hz)
Min. Circuit Ampacity
Fan motor (F.L.A.)
Power supply (V, PHASE, Hz)
Max. Fuse size (time delay) (A)
Min. Circuit Ampacity
Fan motor (F.L.A.)
Compressor
Control voltage
MSY-A24NA MSZ-A24NA
208/230, 1, 60 208/230, 1, 60
1.0 1.0
0.76 0.76
208/230, 1, 60 208/230, 1, 60
20 20
17 17
0.93 0.93
10.1 10.1
16 16
Indoor unit - Remote controller: (Wireless)
Indoor unit - Outdoor unit: DC12-24V (Polar)
* Ensure that the 2 refrigerant pipes are insulated to prevent condensation. Mini
* Refrigerant pipe bending radius must be 4 in. (100 mm) or more. Outside wall thick. Insulation
Pipe diameter ness thickness Insulation material
ZN CAUTION
. . te . . . inch (mm)
Be sure to use the insulation of specified thickness. Excessive thickness may cause
incorrect installation of the indoor unit and lack of thickness may cause dew drippage. For liquid 1/4 (6.35) 0.0315 (0.8) | 5/46 (8) Heat resisting foam
plastic 0.045 Specific
For gas 5/8 (15.88) | 0.0394 (1.0) | 5/16 (8) gravity
* This unit has flared connections on both indoor and outdoor sides. Limits
* Remove the outdoor units valve cover, then connect the pipe. ;
* Refrigerant pipes are used to connect the indoor and outdoor units. Pipe length 100Ft. (30 m) max.
* Be careful not to crush or bend the pipe in pipe bending. Height difference 50 ft. (15 m) max.
No. of bends 40 max.
* Refrigerant adjustment... If pipe length exceeds 25 ft. (7m), additional refrigerant
(R410A) charge is required. Up to 25 ft. (7m) No additional charge is
(The outdoor unit is charged with refrigerant for pipe length up to 25 ft. [7 m]) P , required.
Pipe length
Exceeding 25 ft. (7m)
Additional charge is required.
(Refer to the table below.)
added
Refrigerant to be
1.08 oz. each 5 ft. (20g/m)

1-4. INSTALLATION DIAGRAM
ACCESSORIES
Check the following parts before installation.
<Indoor unit>
(1) [Installation plate 1
(2) Installation plate fixing screw 7
4x*25mm
(3) |Remote controller holder 1
(4) Fixing screw for (3) 9
3.5 x 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
PARTS TO BE PROVIDED
AT YOUR SITE
(A} | Indoor/outdoor unit connecting wire* 4
(B} | Extension pipe 4
(C) | Wall hole sleeve 4
(D) | Wall hole cover 4
(E} | Pipe fixing band 205
(F) | Fixing screw for (E} 4 x 20 mm 205
(G)}{ Piping tape 4
(H) | Putty 4
Drain hose
(I) | (or soft PVC hose, 19/32 in. [15 mm] 4
inner dia. or hard PVC pipe VP16)
(J) | Refrigeration oil {
(K} | Power supply cord {
* 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.
Be sure to use wall hole
sleeve (C) to prevent
indoor/outdoor connecting
wire (A) from contacting
metal parts in the wall and
to prevent damage by
rodents in case the wall is
hollow.
Indoor unit
AA Wal hole cover (D)
rig Seal the wall hole
gap with putty (HR).
Wall hole 7 7
sleeve (C) Fix the pipe to :
ba) wail with pipe fixing
\ band (E).
Cut off the Pipe fixing band
extra length. ~~», (E)
Fixing screw (F)
mm)
or
more/
4
in.
(100
mm)
or
more
for
left
and
left
back
piping
2-7/8
in.
(72
(using
spacer)
20 in. (500 mm)
Units should be installed by licensed contractor
according to local code requirements.
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.
When the piping is to be attached to a
wall containing metals (tin plated) or metal
netting, use a chemically treated wooden
piece 25/32 in. (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.
Outdoor unit installation
Unit: inch
33-1/16
B56 19-11/16
we Airinlet
a ©
Te %
tb 2
+} p Air outlet ~
4-3/8 x 13/16 slot 1-18/32
Unit: mm
840
400 500
ap Air inlet dy
WIS 2
Bis 8
Le i 7
* Air outlet A
4-10 x 27 slot 40

2. INDOOR UNIT INSTALLATION
2-1. FIXING OF INSTALLATION PLATE
* Find a structural material (such as a stud) in the wall and fix installation plate (1) hori-
zontally with fixing screws (2).
* To prevent installation plate (1) from vibrating, be sure to install the fixing screws in the
holes indicated in the illustration. For added support, fixing screws may also be installed
in other holes.
* When bolts recessed in the concrete wall are to be utilized, secure installation plate (1)
using 7/16 in. x 13/16 in - 7/16 in. x 1 in. (44 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 available in the market.
2-2. WALL HOLE DRILLING
1) Determine the wall hole position.
2) Drill a dia. 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 needs 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.
42) 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:
toquned switch should be INDOOR UNIT
. Groundin
Check the focal code. Terminal block 4 terminal”
** Use a ring tongue terminal
in order to connect a sis2is3
ground wire to terminal.
ALG _ Disconnect
i be :
ig gegs switch*
208/230V AC
iphase, 60Hz
OUTDOOR wr
Power supply - w+
208/230V AC, J—?
iphase 2wires, |—i°>
60Hz
block
1
Cee
Grounding terminal**
“Ealing” ~ 2-718 in. (72 mm) or more
4 in. (100 mm) or more for left and
Bind the line to the center hole. ) left back piping (using spacer)
Installation plate (1)
Level
d
of
oY
F218
in
4-3/4 in. roe de all
{200 mm)
s a a
{120 mm)
or more
-“s _ fen
or more
1
74 ine
* 41% (400 mm)
Wall
insert
Fixing screw (2) Align the plumb the Align the | Center of dia.
line with the mark scale.* |/scale with | 3 in. (75 mm)
. the line.* | hole
Piumb
* Same for left hole.
Wail
Din. TZ
{75 mm) ao 6/32-9/32 in.
VE {5-7 mm)
Outdoor side
* Connect wires to the matching num-
* For future servicing, give extra length
Electrical
OX
Fixing
screw
Conduit
plate
Se . aA KA Conduit
& eee \ ‘ pipe
a (for rear
piping)
5 1
y 1 &
eo ®&
2 oy
a
Lock nut 7
Elbow joint
(for right, left, or downward piping)
Indoor terminal
block
Grounding
terminal
bers of terminals
to the connecting wires. e
Conduit plate
Lock
nut
Less
than
1-3/16
Conduit
pipe
or
!
elbow
joint
in.
30
mm)
Elbow
joint
Fig.
1
(for
right,
left,
or
downward
piping)
Fig.
2
5/8
in.
1-5/8
in.
(15
mm)
(35
mm)
7
Lead
wire
+ Make ground wire a little longer than | Cut off in Box
others. (More than 1-9/16 in. [40 mm]) [case ofleft Cut offin case of ;
Fig. 3 | piping left-downward piping Fig. 4
Corner box
Cut off in case of
right piping Fig. 5
Cut off in case of
downward piping

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 heaved or snaked.
* Do not pull the hose when applying the tape.
* When the drain hose passes the room, be sure to wrap insulation material (obtainable
at a store) around it.
Note:
Screws may damage the cover of refrigerant pipe during left piping.
Make sure not to damage the cover of refrigerant pipe.
Left or left-rear piping
Note:
Be sure to reattach the drain hose and the drain cap in case of left or left-rear piping.
Otherwise, it could cause drops of water to drip down from the drain hose.
1) Put 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 rear 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 rear 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 not sharp-edged tools such as screwdrivers into the hole at the end of the cap
and insert the cap fully into the drain pan.
5) Insert the drain hose fully into the drain pan at the rear 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 hook the upper part of indoor unit on
installation plate (1). Then, move the indoor unit completely to the left in order to make
placing the piping in the back space 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) Thrust the lower part of the indoor unit into the installation plate (1).
Rear or downward piping
1) Put 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 hook the upper
part of the indoor unit on the installation plate (1).
3) Check if the indoor unit is hooked securely on the installation plate (1) by moving the
unit to left and right.
4) Thrust 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) Put the refrigerant piping and the drain hose together, position them to left side, 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 hook the upper
part of the indoor unit on the installation plate (1).
3) Check if the indoor unit is hooked securely on the installation plate (1) by moving the
unit to left and right.
4) Thrust the lower part of the indoor unit into the installation plate (1).
2-4-2. DRAIN PIPING
* |f the extension drain hose has to pass through a room, be sure to wrap it with
Liquid pipe
Gas pipe
Indoor/outdoor unit
= connecting wire (A)
Felt tape (7)
Piping tape (G)
Cut off in case of left
piping.
~~ Drain hose
Fig. 1 Fig. 2
Drain hose
Drain cap
Fig. 3 Fig. 4
NN
K\
7 DS
SX
Fig. 5
Cut off in case of down-
ward piping.
Cut off in case
of right piping.
To the left
commercially sold insulation. - pain Drain hose a
* The drain hose should point downward for easy drain flow. (Fig. 1) 27-9/16 in. _ rare ving chloride pipe
* if the drain hose provided with the indoor unit is too short, connect it with drain soso ES (70 cm) (30 mm)
hose (1) that should be provided at your site. (Fig. 2) - Toa. BD | Mig rrr
« When connecting the drain hose to the hard vinyl chloride pipe, be sure to insert it Ro i (15 mm) bifferent us securely
. . . ho WWeren
securely into the pipe. (Fig. 3) @) diameter joint
Fig. | Fig. 2 Fig. 3
| Do not make drain piping as shown below. I
At least
. . 1-31/32 in.
Tip of drain
. hose dipped (50 mm)
gap
leakage
Waving
leakage
in water
~ PLP +
Water

3. OUTDOOR UNIT INSTALLATION
3-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Remove the conduit cover.
3) Fix the conduit connector to conduit cover with lock nut then secure it against unit with 5/8 in.
Screws. 1-5/8 in. (15 mm)
4) Loosen terminal screw, and connect indoor/outdoor unit connecting wire (A) from the in- (35 mm)
door 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.
5) Firmly tighten the terminal screws to prevent them from loosening. After tightening, pull
the wires lightly to confirm that they do not move.
6) Connect power supply cord (K).
7) Connect ground wires of indoor/outdoor unit connecting wire (A) and power supply cord
(K) to the TB support.
Power supply cord (K)
8) Install the conduit cover.
9) Install the service panel securely.
Lock nut
Service
panel
oe
Conduit
Terminal biock
f
Grounding
terminal
Power supply cord (K)
Indoor/outdoor unit
connecting wire (A)
Conduit cover
* Make ground wire a little longer than oth-
ers. (More than 1-12/32 in. 35 mm)
* For future servicing, give extra length to
the connecting wires.
\
WAV
3-2. FLARING WORK
4) 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)
* Put the end of the copper pipe to downward direction as you remove burrs in order
to avoid to let burrs drop in the piping.
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 you use.
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.
Good No good
o-
Tilted Uneven Burred
Fig. 1 Fig. 2
Burr _ Copper pipe
x .- Spare reamer
: | 1 » \\<- Pipe cutter » i
Fig. 3
Fiaring tool
laring too! A
Ss
\\
J
/
.---
Copper
pipe
Die
Clutch type = Wing nut type
Fig. 4 Flare nut Fig. 5
inside is shin-
Smooth all ing without any
around . scratches.
C ey
™
Even length L
all around a
Fig. 6
Ainch (mm) Tightening torque
Pipe diameter Nut ‘
Pp h inch Clutch Clutch Wing nut ftelb
inch (mm) (mm) type tool type tool type tool Nem (kgfecm)
for R410A | for R22 for R22 g
10 to 13
44 13.7 to
@ 1/4 (6.35) (17) 0.06 to 477 ue
0.08 )
(1.5 to 25 to 30
3/8 20 34.3 to
23/8 (9.62) | (55) 0.04 to ) a4} (350 to
0to0.02 | 0.06 420)
(0 to 0.5) (1.0 to 36 to 42
ot2 (12.7) | 2 1.5) 49.0 to (500 to
‘ (26) 0.08 to 56.4 575
0.10 )
(2.0 to
05/8 5/8 2.5) 73.5 to “750 8
(15.88) (29) 78.4 800)

3-3. PIPE CONNECTION
* Fasten flare nut with a torque wrench as specified in the table.
* When fastened too tight, flare nut may brake after a long period and cause refrigerant
leakage.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
* Apply a thin coat of refrigeration oil (J) on the seat surface of pipe.
* For connection, first align the center, then tighten the first 3 to 4 turns of flare nut.
* Use tightening torque table below as a guideline for indoor unit side union joint section,
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 in the same manner applied for
indoor unit.
* For tightening, use a torque wrench or spanner and use the same tightening torque ap-
plied for indoor unit.
3-4. 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 (G), apply taping starting from the entry of outdoor unit.
* Stop the end of piping tape (G) with tape (with adhesive agent attached).
* When piping have to be arranged through above ceiling, closet or where the temper-
ature and humidity are high, wind additional commercially sold 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 valve will not work in its initial state fresh out of the factory, totally closed with cap
on.)
2) Connect gauge manifold valve and vacuum pump to service port of stop valve on the
gas pipe side of the outdoor unit.
0.101 MPa Compound pressure gauge
“4
to
5
tums
Stop
valve
cap
(-30
in.Hg
(for
R410A)
(Torque
19.6
to
[-760
mHg])
Pressure
gauge
*Close
*Open ‘|
Ss
Hexagonal wrench
29.4 Nem, 200
to 300 kafricm) St valve
for QUID
# (for R410A)
Gauge manifold valve
(for R410A)
Handle High
te= Charge hose
(for R410A)
Service port cap
(Torque 13.7 to
17.7
Nem,
140
to
Adapter
for
pre-
MUNI
.
venting
the
back
180
kgfecm)
flow
Vacuum
pump
(or
the
vacuum
pump with the function to
prevent 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.
[Precautions when using the control valve}
t g When attaching the control valve to
/ Service port the service port, make sure that the
Control wave a valve core is in closed position, and
then tighten part A. Do not tighten
Open ch Charge hose part A or turn the body when valve
ose Body 9 core is in open position.
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. Test run will be performed for 30
minutes. If the left side lamp of the operation indicator
blinks every 0.5 seconds, inspect the indoor/outdoor unit
corinecting wire (A) for mis-wiring. 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.
Emergency operation switch
(E.0. SW)
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller and check that an electronic sound is
heard 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.
4-3. AUTO RESTART FUNCTION
This product is equipped with an auto restart function. When the power supply is stopped
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, tum off the unit with the E.O. SW or
the remote controller before turning off the power supply. Not doing so will cause the
unit to start operation automatically when power supply is resumed.
To the user
* After installing the unit, make sure to explain the user about auto restart function.
+ f auto restart function is unnecessary, it can be deactivated. Consult the service rep-
resentative to deactivate the function. Refer to the service manual for details.
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 pointer gauge manifold valve remains
in the same position. Confirm that pressure gauge shows ~0.101 Mpa [Gauge] (~30
in.Hg [~760 mmHgJ).
6) Remove gauge manifold valve quickly 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 without fully opening lowers the perform-
ance and this causes trouble.
8) Refer to 1-3., 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
4-4, EXPLANATION TO THE USER
* Using the OPERATING INSTRUCTIONS, explain to the user how to use the air condi-
tioner (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. RELOCATION AND MAINTENANCE
5-1. REMOVING AND INSTALLING THE PANEL ASSEMBLY
Removal procedure
4) 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.
3) Fit in the top of the front panel.
4) Fit in the bottom of the front panel and tighten it using screws.
5) Push the section of the front panel marked by the arrows to close the front panel
securely.
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 no refrigerant is 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 kgficm’}).
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 Ibffin’ [0.5 to 0 kgf/cm’).
6) Stop the emergency COOL operation.
Press the E.O. SW twice to stop the operation.
Horizontal vane
Fig. 2
GLEE,
Square hole
a MITSUBISHI ELECTRIC CORPORATION
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO
100-8310, JAPAN