Mitsubishi Electric Mr. Slim MXZ-2B20NA User manual

MITSUBISHI
47% ELECTRIC
Split-type Air-Conditioner
MXZ-2B20NA
INSTALLATION MANUAL
° Refer to the installation manual of each indoor unit for indoor unit in-
stallation.
ATTENTION
This manual mentions how to install only the outdoor unit MXZ-2B20NA.
As for the way of installation for indoor unit, please refer to the installation manual
being attached each indoor unit.
The installation manual details the suggested installation method.
Any structural alterations necessary for installation must comply with local building
code requirements.
1. BEFORE INSTALLATION o.oo etree rane rrieee tae eeranae 2
2. OUTDOOR UNIT INSTALLATION o.oo renee 5
3. FLARING WORK AND PIPE CONNECTION... eee 6
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN... ee 7
5. RELOCATION AND MAINTENANCE. 0.00.0... cece cece tener erences tene ee eeneeee 8
FOR INSTALLER

1. BEFORE INSTALLATION
1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
* Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.
* Be sure to observe the warnings and cautions specified here as they include important items related to safety.
¢ After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.
A WARNING (Could lead to death, serious injury, etc.)
Deo not install the unit by yourself (user).
Incomplete installation could cause fire or electric shock, injury due to the
unit falling, or leakage of water. Consult the dealer from whom you pur-
chased the unit or a qualified installer.
&@ Perform the installation securely referring to the installation manual.
Incomplete installation could cause fire or electric shock, injury due to the
unit falling, or leakage of water.
@ When installing the unit, use appropriate protective equipment and
tools for safety.
Failure to do so could cause injury.
@ Install the unit securely in a place which can bear the weight of the unit.
If the installation location cannot bear the weight of the unit, the unit
could fall causing injury.
@ Perform electrical work according to the installation manual and be
sure to use an exclusive circuit. Do not connect other electrical appli-
ances to the circuit.
lf the capacity of the power circuit is insufficient or there is incomplete
electrical work, it could result in a fire or an electric shock.
& Do not damage the wires by applying excessive pressure with parts
or screws.
Damaged wires could cause fire.
— Be sure to cut off the main power in case of setting up the indoor P.C.
board or wiring works.
Failure to do so could cause electric shock.
@ Use the specified wires to connect the indoor and outdoor units se-
curely and attach the wires firmly to the terminal block connecting
sections so the stress of the wires is not applied to the sections.
Incomplete connecting and securing could cause fire.
& Do not install the unit in a place where inflammable gas may leak.
If gas leaks and accumulates in the area around the unit, it could cause
an explosion.
Do not use intermediate connection of the power cord or the exten-
sion cord and do not connect many devices to one AC outlet.
It could cause a fire or an electric shock due to defective contact, defec-
tive insulation, exceeding the permissible current, etc.
—@ Be sure to use the parts provided or specified parts for the installa-
tion 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 complete-
ly into the outlet.
lf there is dust, clogging, or loose parts on the power supply plug or the
outlet, it could cause electric shock or fire. If loose parts are found on the
power supply plug, replace it.
A CAUTION
@ Ground the unit correctly.
Do not connect the ground to a gas pipe, water pipe, lightning rod or
telephone ground. Defective grounding could cause electric shock.
@ Install an ground leakage breaker depending on the installation place.
lf an ground leakage breaker is not installed, it could cause electric shock.
@ Perform the drainage/piping work securely according to the installa-
tion manual.
lf there is defect in the drainage/piping work, water could drop from the
unit, soaking and damaging household goods.
(Could lead to serious injury in particular environments when operated incorrectly.)
@ Attach the electrical cover to the indoor unit and the service panel
to the outdoor unit securely.
If the electrical cover of the indoor unit and/or the service panel of the
outdoor unit are not attached securely, it could result in a fire or an
electric shock due to dust, water, etc.
@ 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 re-
frigerant 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. If refrigerant
leaks during installation, ventilate the room.
lf refrigerant comes in contact with a fire, harmful gas could be gener-
ated.
@ Check that the refrigerant gas does not leak after installation has
been completed.
lf refrigerant gas leaks indoors, and comes into contact with the flame
of a fan heater, space heater, stove, etc., harmful substances will be
generated.
@ Use appropriate tools and piping materials for installation.
The pressure of R410A is 1.6 times more than R22. Not using appropri-
ate tools or materials and incomplete installation could cause the pipes
to burst or injury.
@ When pumping down the refrigerant, stop the compressor before
disconnecting the refrigerant pipes.
lf the refrigerant pipes are disconnected while the compressor is run-
ning and the stop valve is open, air could be drawn in and the pressure
in the refrigeration cycle could become abnormally high. This could
cause the pipes to burst or injury.
@ When installing the unit, securely connect the refrigerant pipes
before starting the compressor.
If the compressor is started before the refrigerant pipes are connected
and when the stop valve is open, air could be drawn in and the pres-
sure in the refrigeration cycle could become abnormally high. This
could cause the pipes to burst or injury.
@ Fasten a flare nut with a torque wrench as specified in this
manual.
If fastened too tight, a flare nut may break after a long period and cause
refrigerant leakage.
@ The unit shall be installed in accordance with national wiring regu-
lations.
@ Do not touch the air inlet or the aluminum fins of the outdoor
unit.
This could cause injury.
@ Do not install the outdoor unit where small animals may live.
If small animals enter and touch the electric parts inside the unit, it
could cause a malfunction, smoke emission, or fire. Also, advise user
to keep the area around the unit clean.
1-2. REQUIRED TOOLS FOR INSTALLATION
Phillips screwdriver Torque wrench
Level Wrench (or spanner)
Scale
Utility knife or scissors
1-3. SPECIFICATIONS
Flare tool for R410A
4 mm (5/32 in.) hexagonal wrench
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
Power supply Pipe length and height difference *2, *3, *4, *8
Model Rated Frequenc Max. pipe length per indoor Max. Max. no. of bends per in- | Refrigerant adjustment A
Voltage 4 y unit / for multi-system height difference door unit / for multi system *5
MXZ-2B20NA Soy 60 Hz 25 m (82 ft) / 50 m (164 ft) 15 m (49 ft) 25/50 20 g/m (1.08 oz each 5 ft)
*1 Never use pipes with thickness less than specified. The pressure resist-
ance will be insufficient.
*2 Use a copper pipe or a copper-alloy seamless pipe.
*3 Be careful not to crush or bend the pipe during pipe bending.
*4 Refrigerant pipe bending radius must be 100 mm (4 in.) or more.
*5 If pipe length exceeds 40 m (131 ft), additional refrigerant (R410A) charge
is required. (No additional charge is required for pipe length less than
40 m (131 ft).)
Additional refrigerant (m) =A * (pipe length (m) - 40)
Additional refrigerant (ft) = A x 4bipe len + ft) = 131
*6 Insulation material : Heat resisting foam plastic 0.045 specific gravity
*7 Be sure to use the insulation of specified thickness. Excessive thickness
may cause incorrect installation of the indoor unit and insufficient thick-
ness may cause dew drippage.
*8 If the outdoor unit is installed higher than the indoor unit, max. height
difference is reduced to 10 m (33 ft).

1-4. SELECTING PIPE SIZE AND OPTIONAL DIFFERENT-DIAMETER JOINTS
The diameter of connection pipes differs according to the type and capacity of indoor units. Match the diameters of connection pipes for indoor and outdoor
units according to the following table.
° If the diameter of connection pipes does not match the diameter of pipe end connections, use optional different-diameter joints.
[mm (inch)]
Indoor unit
Outdoor unit = 09 or less/12 15
ipe size
(liquid / gas) 6.35 (1/4) / 9.52 (3/8) 6.35 (1/4) / 12.7 (1/2)
AUNIT
B UNIT 6.35 (1/4) / 9.52 (3/8) ~/- ~/ MAC-454JP
1 -5. SELECTING THE INSTALLATION LOCATION
Where it is not exposed to strong wind. Note:
° Where airflow is good and dustless.
e Where rain or direct sunshine can be avoided as much as possible.
e Where neighbours are not annoyed by operation sound or hot air.
¢ Where rigid wall or support is available to prevent the increase of op-
eration sound or vibration.
° Where there is no risk of combustible gas leakage.
¢ When installing the unit at a high level, be sure to secure the unit legs.
° Where it is at least 3 m (9.84 ft) away from the antenna of TV set or
radio. Operation of the air conditioner may interfere with radio or TV re-
ception in areas where reception is weak. An amplifier may be required
for the affected device.
* Install the unit horizontally.
° Please install it in an area not affected by snowfall or blowing snow.
In areas with heavy snow, please install a canopy, a pedestal and/or
some baffle boards.
Note:
It is advisable to make a piping loop near outdoor unit so as to reduce
vibration transmitted from there.
When operating the air conditioner in low outside temperature, be sure
to follow the instructions described below.
° Never install the outdoor unit in a place where its air inlet/outlet side
may be exposed directly to wind.
* To prevent exposure to wind, install the outdoor unit with its air inlet
side facing the wall.
* To prevent exposure to wind, it is recommended to install a baffle
board on the air outlet side of the outdoor unit.
Avoid the following places for installation where air conditioner trouble
is liable to occur.
° Where flammable gas could leak.
* Where there is much machine oil.
* Salty places such as the seaside.
° Where sulfide gas is generated such as a hot spring.
° Where there is high-frequency or wireless equipment.
FREE SPACE REQUIRED AROUND OUTDOOR UNIT
1. Top side obstacles 2. Front (blowing) side open
When there is an obstacle behind the 100 (3.94) or more As long as space like the one
rear side only, it does not matter if | shown in the figure can be
there is an obstacle over the top side maintained, it does not mat- 200 (7.87)
as shown in the figure below. 500 (19.68) l ter if there are obstacles in — ormore
of more three directions (but top side dE
Mal is open).
100 (3.94) 350 (13.78)
Wy or more | -— | | or more
VT T 1
3. Obstacles on front (blowing) side only ——— 4, Obstacles on front and rear side only
In this case, the rear, both sides and The unit can be used by at-
top should be open. taching an optional outdoor LLLLLLLLL ELLs ann 4)
blowing guide (MAC-889SG)
Co) (but both sides and top are [|
Oy | 500 (19.68) or more open). —— 500 (19.68) or more
VIATMEMTTTTTTTT TT),
7
Blowing guide (MAC-889SG)
5, Service space
Keep the service space as shown in the figure below for mainte- * When installing the unit in an area that is enclosed on four sides such
nance. as a verandah, be sure to leave move than 200 mm (7.87 in.) behind
the unit as shown.
¢ When there is a lack of airflow or there is a possibility of becoming
100 (3.94) short cycle, install an outlet guide and make sure there is enough
or more space behind the rear side of the air inlet.
Service space
Note:
===. Make sure not to install several outdoor units sideways next to each
500 (19.68) or more other.
AG L.
100
(3.94)
Window
or more a ae
2? | 777 pons
7 More than 200 “Y
500
(19.68)
|
—
(7.87)
4
More
th
350 (13.78) or more 5 g- More than
or more (13.78) 1 . Got |More than Loot 7! Y), 350 (13.78)
. 200 (7.87) oe Z
—=ii4-— ore than
200 (7.87)
Less than 1,200 (47.3) of the front surface side
[Unit: mm (inch)

1-6. INSTALLATION DIAGRAM
ing material tightly so that there is
When the piping is to be at-
tached to a wall containing metals
(tin plated) or metal netting, use
a chemically treated wooden
piece 20 mm (7.9 in.) or thicker
between the wail and the piping
or wrap 7 to 8 turns of insulation
vinyl tape around the piping.
7 To use existing piping. perform
MX7-2B20NA ' | More than 500 mm COOL operation for 30 minutes
\ L, (19.69 in.) if the front and pump down before removing
and both sides are open fe the old air conditioner. Remake
flare according to the dimension
for new refrigerant.
: More than
“S100 mm (3.94 in.)
More than
200 mm (7.87 in.) if there are
obstacles to both sides
More than 100 }-
mm (3.94 in.) i I p. «—(F)
Open as a rule
More than 500 mm (19.69 in.) if the back,
both sides and top are open
More than 350 mrn (13.78 in.)
Units should be installed by licensed contractor according to local code requirements.
Outdoor unit installation
835 (32.87)
166
(6.53)| 500 (19.69)
a Air inlet 5 &
Air inlet G>
330
(13.0)
361
(14.21)
396
(15.59)
|
Paar outlet
4-10(0.39) x 21(0.83) Oval holes [Unit: mm (inch)]
1-7. MOUNTING ARRANGEMENT OF DRAIN SOCKET
Please perform the drain piping work only when draining from one place.
1) Choose one hole to discharge drain and install the drain socket to the hole.
2) Close the rest of the holes with the drain caps.
PARTS TO BE PROVIDED AT YOUR SITE
After the leak test, apply insulat-
/ no gap.
(A) |Power supply cord* 4
(B) |Indoor/outdoor unit connecting wire* 1
(C) |Extension pipe (Refer to 1-4.) 4
(D) | Wall hole cover 1
(E) |Piping tape 4
Extension drain hose
(F) (or soft PVC hose, 15 mm (19/32 1
in.) inner diameter or hard PVC
pipe VP 16)
(G) |Refrigeration oil ote
(H) |Putty 1
(I) [Pipe fixing band 2to7
(J) [Fixing screw for (1) 2to7
(K) {Wall hole sleeve 4
Soft PVC hose, 15 mm (19/32 in.)
(L) Jinner diameter or hard PVC pipe 4
VP16 for drain socket
* Note:
Place indoor/outdoor unit connecting wire (B) and
power supply cord (A) at least 1 m (39.4 in.) away
from the TV antenna wire.
The “Q'ty” for (B) to (K) in the above table is quan-
tity to be used per indoor unit.
3) Connect a vinyl hose of 15 mm (19/32 in.) in the inside diameter on the market with the drain socket and lead drain.
Note:
Install the unit horizontally.
Do not use the drain socket in the cold regions. Drain may freeze and it makes the fan stop.
The outdoor unit produces condensate during the heating operation. Select the installation place to ensure to prevent the outdoor unitand/ or the grounds
from being wet by drain water or damaged by frozen drain water.

2. OUTDOOR UNIT INSTALLATION
2-1. CONNECTING WIRES FOR OUTDOOR UNIT
* Be sure to use special circuits for room air conditioner.
* Wiring work should be based on applicable technical standards.
* Wiring connections should be made following the diagram.
* Screws should be tightened so they won't loosen.
ELECTRICAL SPECIFICATIONS
OUTDOOR UNIT MXZ-2B20NA
Power supply (V, PHASE, Hz) 208/230, 1, 60
Max. Fuse size (time delay) (A) 20
Min. Circuit Ampacity (A) 15
Fan motor (F.L.A) 0.96
Compressor REA) 10.4
(L.R.A) 15
Contro! voltage Indoor unit-Remote controller : (Wireless)
Indoor unit-Outdoor unit : DC12-24V
1) Remove the service panel.
2) Fix the conduit connector to conduit cover with lock nut then secure it
against unit with screws.
3) Fix the conduit cover to the outdoor unit then secure it with screws.
4) Connect power supply cord and indoor/outdoor connecting wire to the ter-
minal block.
(Leave some slack in wires to allow easier servicing.)
Grounding terminal
Conduit
5) Close the service panel securely. Make sure that 3-2. PIPE CONNECTION DBs / cover
is completed. . ‘ —
as
| S
Lock nut Connector
Remark: =
* A disconnect switch should be required. Check the local code. MPCOR UNTE] INPOOR UN TEE
** Use aring tongue terminal in order to connect a ground wire to terminal. erminal bloc erminal bloc
AN tS
Grounding : , | Grounding
terminal ** : A A Ai terminal **
* i a
208/230 V AC Disconnect 208/230 V AC Disconnect
iphase 60 Hz switch * iphase 60 Hz switch *
Grounding Grounding
terminal ** terminal **
4 &
O Oo
Terminal SiS283 S1/S2S3
block 1 Terminal block Terminal block,
UNITA UNIT B
OUTDOOR UNIT
Pe L
fe Ground
rower SUPP ea VAC |e Connect wires to the matching numbers of terminals.
phase ewires 2 ¢ Be sure to attach each screw to its correspondent
terminal when securing the cord and/or the wire to the
terminal block.
CONNECTING WIRES AND CONNECTING 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 code.
POWER SUPPLY CABLE AND GROUND WIRE
° Use solid or stranded conductor AWG 14.
° Use copper conductors only.
* Follow local electrical code.
Z\ WARNING:
Use the indoor/outdoor unit connecting wire that meets the Standards to connect the indoor and outdoor units and fix the wire to the terminal
block securely so that no external force is conveyed to the connecting section of the terminal block. An incomplete connection or fixing of the
wire could result in a fire.
For future servicing, give extra length to the connecting wires.

3. FLARING WORK AND PIPE CONNECTION
3-1. FLARING WORK
1) Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)
2) Completely remove all burrs from the cut cross section of pipe. (Fig. 3) Good No good
* Put the end of the copper pipe to downward direction as you Copper 907 ps Levene .
remove burrs in order to avoid to let burrs drop in the piping. (Se
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.) Tilted Uneven Burred
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension Fig. 4 Fig. 2
shown in the table. Select A mm from the table according to the tool
you use. Flaring tool
5) Check a Copper pipe S
* Compare the flared work with Fig. 6. Burr Spare reamer DO
¢ If flare is noted to be defective, cut off the flared section and do [| 0 he cutter & [| és
flaring work again. | |
Clutch type Wing nut type
Fig. 3 Fig. 4
A inside is shin-
Smooth all ing without any
around \ scratches.
. ae
, Lt" Copper pipe ‘,
Die “S\ Even length
* all around
Flare nut
Fig. 5 Fig. 6
A inch Tightening t Pipe diameter Nut [mm (inch)] ightening torque
[mm (inch)] (mm) Clutch type tool Clutch type tool Wing nut type tool Nem kgfeem ftlb
for R410A for R22 for R22
26.35 (1/4) 17 1.51020 13.7 to 17.7} 140 to 180 10to 13
29.52 (3/8) 22 0to0.5 1.0 to 1.5 (0.06 to 0.08) 34.3 to. 41.2} 350 to 420 | 25 to 30
912.7 (4/2) 26 (0. to 0.02) (0.04 to 0.06) 2.0 to 2.5 49.0 to 56.4] 500 t0 575 | 36 to 42
215.88 (5/8) 29 (0.08 to 1.0) 73.5 to 78.4} 750 to 800 | 54 to 58
3-2. 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.
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 applied for indoor unit.
Ve PGCE
When installing the unit, securely connect the refrigerant
pipes before starting the compressor.
3-3. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Using piping tape (E), apply taping starting from the entry of outdoor
unit.
* Stop the end of piping tape (E) with tape (with adhesive agent at-
tached).
¢ When piping have to be arranged through above ceiling, closet or
where the temperature and humidity are high, wind additional com-
mercially sold insulation to prevent condensation.

4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
—0.101MP.
1. PURGING PROCEDURES AND LEAK TEST Stop valve cap GAQIMEa | Compound pressure
i : :
*4
to
5
turns
(Torque
19.6
to
gauge
(for
R410A)
1) Remove service port cap of stop valve on the side of the outdoor unit 49 4 Nem 200 to (-30 in.Hg)]
gas pipe. (The stop valve will not work in its initial state fresh out of Close 300 kgfecm, 15 to Pressure gauge
(for R410A)
the facto! Y: totally closed wit cap oO ) ©
© Gauge manifold
2) Connect gauge manifold valve and vacuum pump to service port of ‘ny
stop valve on the gas pipe side of the outdoor unit.
3) Run the vacuum pump. (Vacuumize for more than 15 minutes.) ?
Hexagonal! wrench
22 ft-lb)
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 mani-
Charge hose
Service port cap
fold valve remains in the same position. Confirm that pressure gauge (Torque 13.7 to
shows —0.101 MPa [Gauge] [-760 mmHg(-30 in.Hg)]. 17.7 Nem, 140 to ~
6) Remove gauge manifold valve quickly from service port of stop 180 kgfecm, 10 to MUTT
valve. 13 ftelb) Stop valve bait Vacuum pump
7) After refrigerant pipes are connected and evacuated, fully open all for GAS (for R410A)
stop valves on both sides of gas pipe and liquid pipe. Operating with-
out fully opening lowers the performance and this causes trouble. Precautions when usin .
8) Refer to 1-3., and charge the prescribed amount of refrigerant if the control valve 9 When attaching the control valve to
needed. Be sure to charge slowly with liquid refrigerant. Otherwise,
composition of the refrigerant in the system may be changed and af-
fect performance of the air conditioner. , { 4
9) Tighten cap of service port to obtain the initial status. i eS <Service port
10) Leak test
form or loosen if excess pressure is
applied. This may cause gas leak,
<a When attaching the control valve to
== the service port, make sure that the
Charge hose valve core is in closed position, and
(forR410A) then tighten part A. Do not tighten
part A or turn the body when valve
Fy " core is in open position.
4-2.
GAS
CHARGE
Union
Perform gas charge to unit. Stop valve
1) Connect gas cylinder to the service port of stop valve. Liquid pipe
2) Perform air purge of the pipe (or hose) coming from refrigerant gas
cylinder.
3) Replenish specified amount of the refrigerant, while operating the air
conditioner for cooling.
Outdoor
unit
Note: Indoor
In case of adding refrigerant, comply with the quantity specified for the
refrigerating cycle.
CAUTION:
When charging the refrigerant system with additional refrigerant, be sure
to use liquid refrigerant. Adding gas refrigerant may change the composi-
tion of the refrigerant in the system and affect normal operation of the air
conditioner. Also, charge the system slowly, otherwise the compressor
will be locked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder Refrigerant gas
with warm water [under 40°C(140°F)] during cold season. But never use cylinder
naked fire or steam. operating valve
(for R410A) \
Stop valve with
service port
Gas pipe
~<a Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
L>—<—J ~toneee Flectronic scale for
refrigerant charging

4-3. TEST RUN
* Be sure to perform the test run for each unit. Make sure each indoor unit operates properly following the installation manual attached to the unit.
* If you perform the test run for all indoor units at once, you cannot detect any erroneous connection, if any, of the refrigerant pipes and the indoor/outdoor
unit connecting wires.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner.
4-4. EXPLANATION TO THE USER
* Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (how to use the remote controller, how to remove the air fil-
ters, how to remove or put the remote controller in the remote controller holder, how to clean, precautions for operation, etc.)
* Recommend the user to read the OPERATING INSTRUCTIONS carefully.
5. RELOCATION AND MAINTENANCE
5-1. 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 atmos-
phere.
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 operation 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.
To stop operation, press the E.O. SW several times until all LED lamps turn off. Refer to operating instructions for details.
A WARNING
When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes. The compressor may burst if air etc. get into it.

4 MITSUBISHI
47% ELECTRIC
Climatiseur Mini-Split
MXZ-2B20NA
MANUEL D’INSTALLATION
° Se reporter au manuel d’installation de chaque appareil intérieur pour
procéder a leur installation.
ATTENTION
Le présent manuel décrit la procédure a suivre pour installer ’unité externe uni-
quement MXZ-2B20NA. Pour en savoir plus sur linstallation des unités internes,
consulter le manuel d’installation accompagnant chacune de ces unités.
Le manuel d’installation détaille la méthode d’installation suggérée.
Toute altération structurelle requise pour installation doit étre conforme aux exi-
gences du code du batiment local.
1. AVANT LINSTALLATION oo retire ree tnit etre eens 10
2. INSTALLATION DE L’APPAREIL EXTERIEUR........c.cceccccccceccseeesesteteeeteeees 13
3. TRAVAUX D'EVASEMENT ET RACCORDEMENT DES TUYAU®X 0... 14
4. PROCEDURES DE PURGE, TEST DE CONTROLE DES FUITES ET
ESSAI DE FONCTIONNEMENT wees ceeeeeeeeeeeeeeeeeeeeeeseeeeeseeeeesnee eraser nreneenneaeeaeeeneaes 15
5. DEPLACEMENT ET ENTRETIEN .0000. cece eect rene eee eee ete eee eeeennaees 16
DESTINE A L’INSTALLATEUR

10
1. AVANT VINSTALLATION
1-1. INSTRUCTIONS A RESPECTER A TOUT MOMENT PAR MESURE DE SECURITE
* Veuillez lire les “INSTRUCTIONS A RESPECTER A TOUT MOMENT PAR MESURE DE SECURITE’ avant de procéder a installation du climatiseur.
* Veuillez respecter scrupuleusement les mises en garde contenues dans ce manuel car elles concernent des points essentiels a la sécurité.
° Aprés avoir lu ce manuel, veuillez le conserver avec les INSTRUCTIONS DE FONCTIONNEMENT de l'appareil pour pouvoir la consulter ultérieurement.
ON M3 ages
& N’installez jamais Punité seul (utilisateur).
Une installation incompléte peut étre a l’origine d’un incendie, d’une
électrocution, de blessures suite a la chute de l'appareil ou de fuites
d'eau. Consulter un revendeur local ou un installateur agréé.
& Exécuter les travaux d’installation en toute sécurité conformément aux
instructions du manuel d’installation.
Une installation incompléte peut étre a l’origine d’un incendie, d’une électrocution,
de blessures suite a la chute de l'appareil ou de fuites d’eau.
& Lors delinstallation de Pappareil, utiliser équipement de protection et les
outils adéquats, par mesure de sécurité.
Le non-respect de ces recommandations peut étre a l’origine de blessures.
& Par mesure de sécurité, installer Pappareil dans un endroit capable de
supporter son poids.
Si l'appareil est installé dans un endroit incapable de supporter son poids, il
pourrait tomber et blesser quelqu’un.
& Exécuter les travaux d’électricité en toute sécurité conformément aux ins-
tructions du manuel d’installation et prévoir un circuit électrique réservé
au climatiseur. Ne brancher aucun autre appareil électrique sur le circuit
du climatiseur.
Un circuit électrique de capacité insuffisante ou une installation incorrecte peuvent
étre a lorigine d’un incendie ou d'une électrocution.
& Pour éviter toute détérioration, veillez 4 ce que les piéces et les vis
n’exercent pas de pression excessive sur les cables.
Des cables endommagés pourraient provoquer un incendie.
& Toujours couper Palimentation principale lors de installation de la carte
a circuits imprimés du panneau de commande de lunité interne ou lors
dune intervention sur le cablage électrique.
Le non-respect de ces recommandations peut étre a l’origine d’une électrocu-
tion.
@ Utiliser les cables spécifiés pour raccorder en toute sécurité les unités
interne et externe et fixer les cables solidement aux sections de rac-
cordement des blocs de sorties de fagon 4 ce qu’ils n’exercent aucune
pression sur les sections de raccordement.
Un branchement incomplet et non sécurisé peut provoquer un incendie.
& Ne pas installer l'appareil dans un endroit exposé 4 des fuites de gaz
inflammable.
La fuite et accumulation de gaz autour de l'appareil peut entrainer des risques
d’explosion.
& Ne pas utiliser de raccord intermédiaire ou de rallonge pour brancher
fe cordon d’alimentation et ne pas brancher plusieurs appareils 4 une
méme prise secteur.
Un mauvais contact, une isolation insuffisante, un courant trop fort, etc. peuvent
entrainer des risques d’incendie ou d’électrocution, etc.
@ Veiller a utiliser les pieces fournies ou spécifiées dans le manuel tors
des travaux d’installation.
L’utilisation de piéces défectueuses peut étre a l’origine de blessures corporelles
ou d'une fuite d’eau suite 4 un incendie, une électrocution, la chute de l'appareil,
etc.
i Au moment de brancher la fiche d’alimentation dans la prise secteur,
veiller 4 dépoussiérer et nettoyer la fiche et la prise en contrélant
qu’aucun élément n’est desserré. S’assurer que ta fiche
d’alimentation est enfoncée a fond dans la prise secteur.
Ne pas raccorder le cable de terre a un tuyau de gaz, une conduite
d'eau, un paratonnerre ou le cable de terre d’un téléphone. Une mise a la terre
incorrecte risquerait de provoquer une électrocution.
& Installer un disjoncteur de fuites a la terre en fonction du lieu
d’installation.
L'absence de disjoncteur de fuites a la terre peut étre a !'origine d'une électrocution.
@ Réaliser les travaux de vidange/tuyauterie conformément aux instruc-
tions de la notice d’installation.
Si les travaux de vidange/tuyauterie ne sont pas réalisés correctement, de
l'eau pourrait s’écouler et endommager le mobilier qui se trouve sous l'appareil.
(Peut entrainer ia mort, des blessures graves, etc.)
A PRECAUTION (Peut provoquer des blessures graves dans certains environnements sil appareil n'est pas utilisé correctement )
& Raccorder correctement Punité a la terre.
La présence de poussiére, de saleté ou d’éléments desserrés dans la fiche
d’alimentation ou la prise secteur peut étre a l’origine d'une électrocution ou d’un
incendie. Contréler la fiche d’alimentation et remplacer les éléments desserrés
éventuels.
Fixer correctement le couvercle du boitier électrique de l unité interne et
le panneau de service de lunité externe.
Si le couvercle du boitier électrique de l’unité interne et/ou le panneau de service
de l’unité externe sont mal fixés, ils risquent de provoquer un incendie ou une
électrocution en raison de la poussiére, de l'eau, etc. présentes dans le circuit.
Lors de installation, du déplacement ou de lentretien de l'appareil,
veiller a ce qu’aucune substance autre que le réfrigérant spécifié
(R410A) ne pénétre dans le circuit de réfrigération.
La présence d’une substance étrangére, comme de lair dans le circuit, peut
provoquer une augmentation anormale de la pression et causer une explosion,
voire des blessures. L’utilisation de réfrigérant autre que celui qui est spéciflé pour
le systeme provoquera une défaillance mécanique, un mauvais fonctionnement
du systéme, ou une panne de l'appareil. Dans le pire des cas, la sécurité du
produit pourrait étre gravement mise en danger.
Ne libérez pas le réfrigérant dans atmosphere. En cas de fuite de rétri-
gérant pendant l installation, aérez la piéce.
Tout contact entre le réfrigérant et une flamme pourrait provoquer l’émission de
gaz toxiques.
Ala fin de Pinstallation, aucune fuite de réfrigérant ne doit étre présente
sur le circuit.
En cas de fuite de réfrigérant dans une piéce, et si le réfrigérant entre en contact
avec la partie chauffante d’un appareil de chauffage a ventilation, chauffage
d’appoint, poéle, etc., des substances toxiques peuvent se dégager.
Utiliser les outils et Péquipement de tuyauterie adaptés 4 Pinstallation.
La pression du refrigérant R410A est 1,6 fois supérieure a celle du R22.
Lutilisation d’outils ou d’équipements inadaptés et une installation incompléte
peuvent provoquer I’éclatement des tuyaux et blesser quelqu’un.
Pendant lopération d’aspiration du réfrigérant, arréter le compresseur
avant de débrancher les tuyaux de réfrigérant.
Si les tuyaux de réfrigérant sont débranchés avant l’arrét du compresseur et si
le robinet d’arrét est ouvert, de l’air pourrait étre aspiré et la pression du cycle de
réfrigération pourrait monter de fagon anormale. Les tuyaux pourraient éclater
et blesser quelqu’un.
Pendant installation de Pappareil, brancher correctement les tuyaux de
réfrigérant avant de lancer le compresseur.
Si le compresseur démarre avant le branchement des tuyaux de réfrigérant et si
le robinet d’arrét est ouvert, de l’air pourrait étre aspiré et la pression du cycle de
réfrigération pourrait monter de fagon anormale. Les tuyaux pourraient éclater
et blesser quelqu’un.
Fixer un écrou évasé avec une clé dynamométrique comme indiqué
dans ce manuel.
Si l’écrou évasé est trop serré, il pourrait se rompre au bout de plusieurs années
et provoquer une fuite de réfrigérant.
L’installation de Pappareil doit étre conforme aux normes électriques
nationales.
Ne toucher ni 4 Pentrée d’air ni aux ailettes en aluminium de Punité
externe.
Risque de blessures.
Ne pas installer Punité externe 4 proximité de Phabitat d’animaux de
petite taille.
Si des animaux de petite taille pénétrent dans l’unité et entrent en contact avec
les composants électriques, ils pourraient provoquer un dysfonctionnement, des
émissions de fumée ou un incendie. !I convient également de conseiller a l'utilisateur
de nettoyer réguliérement la périphérie de l'unité.
1-2. OUTILS NECESSAIRES A L’INSTALLATION
Tournevis Phillips
Niveau
Régle graduée
Couteau tout usage ou paire de ciseaux
Clé dynamométrique
1-3. FICHE TECHNIQUE
Clé a ouverture fixe (ou clé simple)
Clé hexagonale de 4 mm (5/32 in.)
Outil d’'évasement pour le modéle R410A
Tubulure de jauge pour le modéle R410A
Pompe a vide pour le modéle R410A
Tuyau de charge pour le modéle R410A
Coupe-tuyau avec alésoir
Alimentation Longueur des tuyaux et différence de hauteur *2, *3, *4, *8
Modéle Tension ; Longueur max. des tuyaux Difference Nombre max. de coudes par a .
nomi- | Fréquence | par appareil intérieur / pour de hauteur max appareil intérieur / pour sys- | Dosage du réfrigérant A*5
nale systéme a plusieurs appareils , téme a plusieurs appareils
MXZ-2B20NA Sao 60 Hz 25 m (82 ft) / 50 m (164 ft) 15 m (49 ft) 25/50 20 g/m (1,08 once tous les 5 ft)
*1 Nutilisez jamais des tuyaux dont l’épaisseur est inférieure a celle recom-
mandée. Leur résistance a la pression serait insuffisante.
*2 Utilisez un tuyau en cuivre ou en alliage de cuivre sans soudure.
*3 Veillez a ne pas écraser ou tordre le tuyau lors du cintrage.
*4 Le rayon du cintrage d'un tuyau de réfrigérant doit étre de 100 mm (4 in.)
minimum.
*5 Sila longueur du tuyau dépasse 40 m (131 ft), une quantité supplémentaire
de réfrigérant (R410A) doit étre ajoutée. (Aucune quantité supplémentaire
n’est nécessaire pour une longueur de tuyau inférieure a 40 m (131 ft).)
Quantité supplémentaire de réfrigérant (m) = A x (longueur de tuyau (m) - 40)
Quantité supplémentaire de réfrigérant (ft) = A * longueur de “ au (ft) - 131
*6 Matériau d'isolation : mousse plastique résistante a la chaleur d'une den-
sité de 0,045
*7 Utilisez toujours un matériau isolant de l’épaisseur spécifiée. Une isolation
trop épaisse pourrait étre a l’origine d'une installation incorrecte de l’unité
interne alors qu'une isolation trop fine pourrait provoquer des fuites.
*8 Si l'appareil extérieur est plus haut que l'appareil intérieur, la différence de
hauteur max. est limitée a 10 m (33 ff).