Mitsubishi Electric Mr. Slim MXZ-2B20NA User manual

MITSUBISHI
ELECTRIC
Split-type Air-Conditioner
IViXZ-2B20NA
iNSTALLATiON MANUAL ]
• Refer to the installation manual of each indoor unit for indoor unit in- |
/
stallation.
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 .............................................................................. 2
2. OUTDOOR UNIT INSTALLATION ................................................................. 5
3. FLARING WORKAND PIPE CONNECTION ................................................. 6
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN ........................... 7
5. RELOCATION AND MAINTENANCE ............................................................ 8
FOR INSTALLER

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.
[] Do not install the unit by yourself (user). [] Attach the electrical cover to the indoor unit and the service panel
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 electricam work according to the instammationmanual and be
sure to use an exclusive circuit. Do not connect other emectricamappli-
ances to the circuit.
If the capacity of the power circuit is insufficient or there is incomplete
electrical work, it could result in a fire or an electric shock.
[] 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.
If there is dust, clogging, or loose parts on the power supply plug or the
outlet, it could cause electric shock or fire. If loose parts are found on the
power supply plug, replace it.
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.
If 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.
If refrigerant gas leaks indoors, and comes into contact with the flame
of a fan heater, space heater, stove, etc., harmful substances will be
generated.
[] 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.
If 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,
[] 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.
[] mnstalman ground leakage breaker depending on the installation place.
If an ground leakage breaker is not installed, it could cause electric shock.
[] Perform the drainage/piping work securemy according to the instalma-
tion manual.
If there is defect in the drainage/piping work, water could drop from the
unit, soaking and damaging household goods.
[] 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 4 mm (5/32 in.) hexagonal wrench
Utility knife or scissors Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
1=3. SPECIFICATIONS
Model
MXZ-2B20NA
Power supply
Rated
Voltage Frequency
208/ 60 Hz
230 V
Max. pipe length per indoor
unit /for multi-system
25 m (82 ft) /50 m (t64 ft)
Pipe length and height difference *2, *3, *4, *8
Max. Max. no. of bends per in-
height difference door unit /for multi system Refrigerant adjustment A
*5
15 m (49 ft) 25 /50 20 g/m (t .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 x (pipe length (m) -40)
Additional refrigerant (ft) =A x (pipe length (ft) - 131)
5
*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).
2

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.
Outdoor unit
AUNIT
B UNIT
Pipe size
(liquid /gas)
6.35 (t/4) /9.52 (3/8)
[mm (inch)]
Indoor unit
09 or less/t2 15
6.35 (t/4) /9.52 (3/8) 6.35 (t/4) /t2.7 (t/2)
-/- - /MAC-454JP
1-5. SELECTING THE INSTALLATION LOCATION
• Where it is not exposed to strong wind.
• Where airflow is good and dustless.
• Where rain or direct sunshine can be avoided as much as possible.
• Where neighbours are not annoyed by operation sound or hot air.
• Where rigid wall or support is available to prevent the increase of 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.
Note:
When operating the air conditioner in low outside temperature, be sure
to follow the instructions described below.
• Never install the outdoor unit in a place where its air inlet/outlet side
may be exposed directly to wind.
• To prevent exposure to wind, install the outdoor unit with its air inlet
side facing the wall.
• To prevent exposure to wind, it is recommended to install a baffle
board on the air outlet side of the outdoor unit.
Avoid the following places for installation where air conditioner trouble
is liable to occur.
• Where flammable gas could leak.
• Where there is much machine oil.
• 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
When there is an obstacle behind the
rear side only, it does not matter if
there is an obstacle over the top side
as shown in the figure below. 5r00"n(1r968)I _00 (3.94) .......
2. Front (blowing) side open
As long as space like the one
shown in the figure can be
maintained, it does not mat- 2oo (7.87) I
or more
ter if there are obstacles in _/////////////////__
three directions (but topsideisopen), or100more(3.94)!_ I_
3. Obstacles on front (blowing) side only
In this case, the rear, both sides and
top should be open.
"_ [ 500 (19.68) or more
,Z
5. Service space
Keep the service space as shown in the figure below for mainte-
nance.
Service space
_yd////-X_/,_ 100 (3"94)I
500 19.68.......
100 3.94
....
or_c,'] .350(13.78/
500 (19.68) or more
4. Obstacles on front and rear side only
Theunitcanusedat41o00
taching an optional outdoor 4)
blowing guide (MAC-889SG)
(but both sides and top are
open). _ (19.68) or more
,-/////R///,,////
Blowingguide (MAC-889SG)
• When installing the unit in an area that is enclosed on four sides such
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
short cycle, install an outlet guide and make sure there is enough
space behind the rear side of the air inlet.
Note:
Make sure not to install several outdoor units sideways next to each
other.
Window
J
_M°re than ZUU_ M
More than (7.87) ore than
100 394 _//J ____....L...._Morethan _ _/_ 350(13.78)
' " '_ _ _ 200(7.87) 4r_ _--....
..... (( v T -_"_ More than
/"'_ _ 200 (7.87)
Less than 1,200 (47.3) of the front surface side
[Unit: mm (inch)]
3

1=6. INSTALLATION DIAGRAM
(D)
More than 100
mm (3.94 in.)
X Open as a rule (E)
MXZ-2B20NA More than 500 mm (j)
\ (19.69 in.) ifthe front
and are open
both sides
the leak test, apply insulat- |
ingmaterial tightly so that there is]
no gap,
When the piping is to be at-
tached to a wail containing metals
(tin plated) or metal netting, use
a chemically treated wooden
piece 20 mm (7.9 in.) 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 otd air conditioner. Remake
flare according to the dimension
for new refrigerant.
More than
100 mm (3.94 in.)
_More than
200 mm (7.87 in.) if there are
obstacles to both sides
_(F)
PARTS TO BE PROVIDED AT YOUR SITE
(A) Power supply cord* t
(B) Indoor/outdoor unit connecting wire* 1
(C) Extension pipe (Refer to t-4.) t
(D) Wall hole cover 1
(E) Piping tape t
Extension drain hose
(or soft PVC hose, t5 mm (19/32
(F) in.)inner diameter or hard PVC t
pipe VP16) Little
(G) Refrigeration oil amount
(H) Putty t
(I) Pipe fixing band 2 to 7
(J) Fixing screw for (I) 2 to 7
(K) Wall hole sleeve I
Soft PVC hose, t5 mm (19/32 in.)
(L) innerdiameteror hard PVC pipe 1
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.
Open as a rule
More than 500 mm (19.69 in.) if the back,
both sides and top are open More than 350 mm (13.78 in.)
Units should be installed by licensed contractor according to local code requirements, i
Outdoor unit installation
, 835(32.87)
I 166, "" o__
_6.!_ 800(19.69)"t
"_J_ Air inlet
/_4_Air 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.
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.
4

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
Power supply (V, PHASE, Hz)
Max. Fuse size (time delay) (A)
Min. Circuit Ampacity (A)
Fan motor (F.LA)
(R.LA)
Compressor (LR.A)
Control voltage
MXZ-2B20NA
208/230,1,60
2O
15
0.96
10.1
15
lndoorunit-Remote controtter:(Wireless)
lndoorunibOutdoorunit: 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.)
5) Close the service panel securely. Make sure that 3-2. PIPE CONNECTION
is completed.
Grounding terminal
/cCoOndru,t
Lock nut Connector
Remark:
* A disconnect switch should be required. Check the local code.
** Use a ring tongue terminal in order to connect a ground wire to terminal
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.
r INDOOR UNIT[A] " [ INDOOR UNIT[B']", Terminal block , Terminal block
I I
-_---_---_--,,i Grounding
[._ ._o_._o_.i_rn inai **
[-?_-°_-°_i_ rninai** -_----_---_--:i G.... ding
208/230VAC i i i iDi ....... t 208/230 VAC i iDi t.......
1phase 60 Hz :: switch * 1phase 60 Hz _ switch *
Terminal
block 1
Power supply 208/230 V AC
1phase 2wires 60 Hz
OUTDOORUN,T
Ground
, Connect wires to the matching numbers of terminals.
, Be sure to attach each screw to its correspondent
terminal when securing the cord and/or the wire to the
terminal block.
POWER SUPPLY CABLE AND GROUND WIRE
• Use solid or stranded conductor AWG14.
• Use copper conductors only.
• Follow local electrical code.
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 afire.
I For future servicing, give extra length to the connecting wires. ]
5

3=1. FLARING WORK
1) Cut the copper pipe correctly with pipe cutter. (Fig. t, 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 Amm 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.
-._ opper
p@e
Fig. t
Copper pipe
Burr "_,_fSpare rearner
_1 '_Pipecutter I_
A
Die _-
Flare nut
Fig. 3
Copper pipe
Fig. 5
Good No good
Tilted Uneven Burred
Fig. 2
Flaring tool
Clutchtype Wing nuttype
Fig. 4
inside is shin-
Smooth aft ingwithout any
around _ scratches.
I' Even length
L,_ allaround
Fig. 6
Pipe diameter Nut
[mm (inch)] (mm) Clutch type tool
for R410A
e6.35 (t/4) t7
e9.52 (3/8) 22 0 to 0.5
et2.7 (t/2) 26 (0. to 0.02)
et5.88 (5/8) 29
A [mm (inch)]
Clutch type tool
for R22
1.0 to t .5
(0.04 to 0.06)
Wing nut type tool
for R22
1.5 to 2.0
(0.06 to 0.08)
2.0 to 2.5
(0.08 to 1.0)
Tightening torque
N,m kgf-cm
t3.7 to t7.7 t40 to t80
34.3 to 41.2 350 to 420
49.0 to 56.4 500 to 575
73.5 to 78.4 750 to 800
ft.lb
t0 to t3
25 to 30
36 to 42
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.
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.
%
6

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.
3) Run the vacuum pump. (Vacuumize for more than t5 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 mani-
fold valve remains in the same position. Confirm that pressure gauge
shows -0.101 MPa [Gauge] [-760 mmHg(-30 in.Hg)].
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 with-
out fully opening lowers the performance 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 af-
fect performance of the air conditioner.
9) Tighten cap of service port to obtain the initial status.
10) Leak test
_4 to 5 turns
*Close
Hexagonal wrench
Service port cap
(Torque 13.7 to
17.7 N.m, 140to
180 kgf.cm, 10 to
13 ff.lb)
Stop valve cap
(Torque 19.6 to
29.4 N.m, 200 to
300 kgf.cm, 15 to
22 ft.tb)
Stop valve Stop valve
for GAS for LIQUID
0.101MPa Compound pressure
[-760 mmHg gauge (for R410A)
(-30 in.Hg)] Pressure gauge
R410A)
e manifold
valve (for R410A)
igh
Low e hose
(for R410A)
Vacuum pump
(for R410A)
Precautions when usingJ
the control valve When attachinq the control valve to
the service_ valve core may de-
form or loosen if excess pressure is
applied. This may cause qas leak.
When attaching the control valve to
the service port, make sure that the
valve core is in closed position, and
then tighten part A. Do not tighten
part A or turn the body when valve
core is in open position.
4-2. GAS CHARGE
Perform gas charge to unit.
1) Connect gas cylinder to the service port of stop valve.
2) Perform air purge of the pipe (or hose) coming from refrigerant gas
cylinder.
3) Replenish specified amount of the refrigerant, while operating the air
conditioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the
refrigerating cycle.
CAUTION:
When charging the refrigerant system with additional refrigerant, be sure
to use liquid refrigerant. Adding gas refrigerant may change the 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
with warm water [under 40°C(140°F)] during cold season. But never use
naked fire or steam.
Indoor
unit
Refrigerant gas i
cytinder
operating valve
(for R410A) _
Union
Stop valve
------------[_D_ Liquid pipe
] Union
Union
Stop valve with
service port
--______ Gas pipe
Union
_"'-._ Ga uge manifold
valve (for R410A)
(__ _ Charge hose (for R410A)
Refrigerant gas cylinder
for R410A with siphon
_'-- Refrigerant (liquid)
LC:/___ _ Electronic scale for
refrigerant charging
Outdoor
unit
7

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=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 Ibf/in. 2 [0 kgf/cm2]).
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 Ibf/in2[0.5 to 0
kgf/cm2]).
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.
When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes. The compressor may burst if air etc. get into it. F
8

MITSUBISHI
ELECTRIC
Ciimatiseur Mini-Split
IViXZ-2B20NA
MANUEL D'INSTALLATION
•Se reporter au manuel d'installation de chaque appareil int6rieur pour ]
proc6der a leur installation. /
Le present manuel d_crit la procedure a suivre pour installer I'unit_ externe uni-
quement MXZ-2B20NA. Pour en savoir plus sur I'installation des unit_s internes,
consulter le manuel d'installation accompagnant chacune de ces unit_s.
Le manuel d'installation d6taille la m_thode d'installation sugg_r_e.
"route alteration structurelle requise pour I'installation dolt _tre conforme aux exi-
gences du code du b_timent local.
1. AVANT L'INSTALLATION ............................................................................. 10
2. INSTALLATION DE L'APPAREIL EXTFtRIEUR ............................................ 13
3. TRAVAUX D'EVASEMENT ET RACCORDEMENT DES TUYAUX ............ 14
4. PROCEDURES DE PURGE, TEST DE CONTROLE DES FUITES ET
ESSAI DE FONCTIONNEMENT .....................................................................................15
5. DEPLACEMENT ET ENTRETIEN ............................................................... 16
DESTINi_ .ik L'INSTALLATEUR

10
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 proc6der a I'installation du climatiseur.
• Veuillez respecter scrupuleusement les mises en garde contenues dans ce manuel car elles concernent des points essentiels a la s6curit6.
• Apr_s avoir lu ce manuel, veuillez le conserver avec les INSTRUCTIONS DE FONCTIONNEMENT de I'appareil pour pouvoir la consulter ult6rieurement.
[] N'installez jamais I'unite seul (utilisateur).
Une installation incomplete peut etre a I'origine d'un incendie, d'une
electrocution, de blessures suite a la chute de I'appareil ou de fuites
d'eau. Consulter un revendeur local ou un installateur agre6.
[] Executer les travaux d'installation en toute securite conformement aux
instructions du manuel d'installation.
Une installation incomplete peut etre a I'origine d'un incendie, d'une electrocution,
de blessures suite a la chute de I'appareil ou de fuites d'eau.
[] Lors de I'installation de I'appareil, utiliser I'_quipement de protection et les
outils ad_quats, par mesure de securitY.
Le non-respect de ces recommandations peut etre a I'origine de blessures.
[] Par mesure de s_curite, installer I'appareil darts un endroit capable de
supporter son poids.
Si I'appareil est installe dans un endroit incapable de supporter son poids, il
pourrait tomber et blesser quelqu'un.
[] Executer les travaux d'_lectricite en route securit_ conform_ment aux ins-
tructions du manuel d'installation et prevoir un circuit electrique r_serv_
au climatiseur. Ne brancher aucun autre appareil electrique sur le circuit
du climatiseur.
Un circuit electrique de capacite insuffisante ou une installation incorrecte peuvent
etre a I'origine d'un incendie ou d'une electrocution.
[] Pour eviter toute deterioration, veillez ace que les pieces et les vis
n'exercent pas de pression excessive sur les c_bles.
Des c_bles endommages pourraient provoquer un incendie.
[] Toujours couper I'alimentation principale Iors de I'installation de la carte
circuits imprim_s du panneau de commande de I'unit6 interne ou Iors
d'une intervention sur le c_blage _lectrique.
Le non-respect de ces recommandations peut etre a I'origine d'une electrocu-
tion.
[] Utiliser les c_bles sp_c[fi_s pour raccorder en route s_curite les unit_s
interne et externe et fixer les c_bles solidement aux sections de rac-
cordement des blocs de sorties de fagon a ce qu'ils n'exercent aucune
pression sur les sections de raccordement.
Un branchement incomplet et non securis6 peut provoquer un incendie.
[] Ne pas installer I'appareil darts un endroit expose a des fu[tes de gaz
inflammable.
La fuite et I'accumulation de gaz autour de I'appareil peut entrainer des risques
d'explosion.
[] Ne pas utiliser de raccord interm_diaire ou de rallonge pour brancher
le cordon d'alimentation et ne pas brancher plusieurs appareils a une
m_me prise secteur.
Un mauvais contact, une isolation insuffisante, un courant trop fort, etc. peuvent
entrai"ner des risques d'incendie ou d'electrocution, etc.
[] Veiller a utiliser les pieces fournies ou sp_cifi_es darts le manuel lors
des travaux d'installation,
L'utilisation de pieces defectueuses peut etre a l'origine de blessures corporelles
ou d'une fuite d'eau suite a un incendie, une electrocution, la chute de l'appareil,
etc.
[] Au moment de brancher la fiche d'alimentation darts la prise secteur,
veiller a depoussi_rer et nettoyer la fiche et la prise en contr61ant
qu'aucun element n'est desserr_. S'assurer que la fiche
d'alimentation est enfonc_e a fond darts la prise secteur.
La presence de poussiere, de salete ou d'elements desserres dans la fiche
d'alimentation ou la prise secteur peut etre a I'origine d'une electrocution ou d'un
incendie. Contreler la fiche d'alimentation et remplacer les elements desserres
eventuels.
[] Fixer correctement le couvercle du boitier electrique de I'unit_ interne et
le panneau de service de I'unit_ externe.
Si le couvercle du boitier electrique de I'unite interne et/ou le panneau de service
de I'unite externe sont mal fixes, ils risquent de provoquer un incendie ou une
electrocution en raison de la poussiere, de I'eau, etc. presentes dans le circuit.
[] Lors de I'installation, du deplacement ou de I'entretien de I'appareil,
veiller ace qu'aucune substance autre que le refrigerant sp_cifi_
(R410A) ne penetre darts le circuit de r_frigeration.
La presence d'une substance etrangere, comme de I'air dans le circuit, peut
provoquer une augmentation anormale de la pression et causer une explosion,
voire des blessures. L'utilisation de refrigerant autre que celui qui est speci% pour
le systeme provoquera une defaillance mecanique, un mauvais fonctionnement
du systeme, ou une panne de I'appareil. Dans le pire des cas, la securite du
produit pourrait etre gravement mise en danger.
[] Ne liberez pas le refrigerant darts I'atmosphere. En cas de fuite de r_fri-
g_rant pendant I'installation, aerez la piece.
Tout contact entre le refrigerant et une flamme pourrait provoquer I'emission de
gaz toxiques.
[] A la fin de I'installat[on, aucune fuite de refrigerant ne doit Otre pr_sente
sur le circuit.
En cas de fuite de refrigerant dans une piece, et si le refrigerant entre en contact
avec la partie chauffante d'un appareil de chauffage a ventilation, chauffage
d'appoint, poele, etc., des substances toxiques peuvent se degager.
[] Utiliser les out[Is et I'equipement de tuyauterie adapt_s a I'installation.
La pression du refrigerant R410A est 1,6 fois superieure a celle du R22.
L'utilisation d'outils ou d'equipements inadaptes et une installation incomplete
peuvent provoquer I'eclatement des tuyaux et blesser quelqu'un.
[] Pendant I'operation d'aspiration du refrigerant, arrOter le compresseur
avant de d_brancher les tuyaux de refrigerant.
Si les tuyaux de refrigerant sont debranches avant I'arret du compresseur et si
le robinet d'arret est ouvert, de I'air pourrait etre aspire et la pression du cycle de
refrigeration pourrait monter de fagon anormale. Les tuyaux pourraient eclater
et blesser quelqu'un.
[] Pendant I'installation de I'appareil, brancher correctement les tuyaux de
refrigerant avant de lancer le compresseur.
Si le compresseur demarre avant le branchement des tuyaux de refrigerant et si
le robinet d'arret est ouvert, de I'air pourrait etre aspire et la pression du cycle de
refrigeration pourrait monter de fagon anormale. Les tuyaux pourraient eclater
et blesser quelqu'un.
[] Fixer un ecrou _vas_ avec une cle dynamom_trique comme indiqu_
darts ce manuel.
Si I'ecrou evase est trop serre, il pourrait se rompre au bout de plusieurs annees
et provoquer une fuite de refrigerant.
[] L'installation de I'appareil doit _tre conforme aux normes _lectriques
nationales.
[] Raccorder correctement I'unite a la terre.
Ne pas raccorder le c_ble de terre a un tuyau de gaz, une conduite
d'eau, un paratonnerre ou le c_ble de terre d'un telephone. Une mise a la terre
incorrecte risquerait de provoquer une electrocution.
[] Installer un disjoncteur de fu[tes a la terre en fonction du lieu
d'installation.
L'absence de disjoncteur de fuites a la terre peut _tre a i'origine d'une electrocution.
[] Realiser les travaux de vidange/tuyauterie conform_ment aux instruc-
tions de la notice d'installation.
Si les travaux de vidange/tuyauterie ne sont pas realists correctement, de
I'eau pourrait s'ecouler et endommager le mobilier qui se trouve sous I'appareil.
1-2. OUTILS NECESSAIRES h, L'INSTALLATION
Toumevis Phillips CI_ dynamom_trique
Niveau CI_ a ouverture fixe (ou cl_ simple)
R_gle gradu_e CI_ hexagonale de 4 mm (5/32 in)
Couteau tout usage ou paire de ciseaux Outil d'_vasement pour le module R410A
[] Ne toucher ni a I'entr_e d'air ni aux ailettes en aluminium de I'unit_
externe.
Risque de blessures.
[] Ne pas installer I'unit6 externe a proximit_ de I'hab[tat d'animaux de
petite taille.
Si des animaux de petite taille penetrent dans I'unite et entrent en contact avec
les composants electriques, ils pourraient provoquer un dysfonctionnement, des
emissions de fumee ou un incendie. II convient egalement de conseiller a I'utilisateur
de nettoyer regulierement la peripherie de I'unite.
Tubulure de jauge pour le module R410A
Pompe a vide pour le module R410A
Tuyau de charge pour le module R410A
Coupe-tuyau avec al_soir
1=3. FICHE TECHNIQUE
Alimentation
ModUle Tension
nomi- Fr_quence
nale
208/
MXZ-2B20NA 60 Hz
230 V
Longueur des tuyaux et difference de hauteur *2, *3, *4, *8
Longueur max. des tuyaux Difference Nombre max. de coudes par
par appareil int_rieur /pour de hauteur max. appareil int_rieur /pour sys- Dosage du r_frig_rant A*5
syst_me a plusieurs appareils t_me _ plusieurs appareils
25 m (82 ft) /50 m (t64 ft) 15 m (49 ft) 25 /50 20 g/rn (1,08 oncetousles 5ft
"1 N'utilisez jamais des tuyaux dont I'epaisseur est inferieure a celle recom-
mandee. Leur resistance a la pression serait insuffisante.
*2 Utilisez un tuyau en cuivre ou en alliage de cuivre sans soudure.
*3 Veillez a ne pas ecraser ou tordre le tuyau Iors du cintrage.
*4 Le rayon du cintrage d'un tuyau de refrigerant dolt _tre de 100 mm (4 in.)
minimum.
*5 Si la Iongueur du tuyau depasse 40 m (131 ft), une quantite supplementaire
de refrigerant (R410A) dolt _tre ajoutee. (Aucune quantite supplementaire
n'est necessaire pour une Iongueur de tuyau inferieure a 40 m (131 ft).)
Quantit_ supplementaire de rdrig_rant (m) = A x (Iongueurde tuyau (m)-40)
Quantite supplementaire de r_frig_rant (ft) = A x (Iongueur de tuyau (ft) - 131)
5
*6 Materiau d'isolation : mousse plastique resistante a la chaleur d'une den-
site de 0,045
*7 Utilisez toujours un materiau isolant de I'epaisseur specifiee. Une isolation
trop epaisse pourrait _tre a I'origine d'une installation incorrecte de I'unite
interne alors qu'une isolation trop fine pourrait provoquer des fuites.
*8 Si I'appareil exterieur est plus haut que I'appareil interieur, la difference de
hauteur max. est limitee a 10 rn (33 ft).