Mitsubishi Electric TRANE NTXWST30A112A Series User manual

1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
 
 
 
 
■Do not install the unit by yourself (user).
 

whom you purchased the unit.
■Follow the instructions detailed in the installation manual.
 -
ing, 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 that can bear the weight of the unit.
If the installation location cannot bear the weight of the unit, the unit could fall
causing injury.
■ Perform electrical work according to the installation manual and be sure to use
an exclusive circuit. Do not connect other electrical appliances to the circuit.
 

■Ground the unit correctly.
Do not connect the ground wire to a gas pipe, water pipe, lightning rod or tel-
ephone ground. Defective grounding could cause electric shock.
■ Do not damage the wires.
 
■ Be sure to shut off the main power when setting up the indoor P.C. board or
wiring.
Failure to do so could cause electric shock.
■ -

 
■ 
If gas leaks and accumulates around the unit, it could cause an explosion.
■Do not use intermediate connection of the power cord or the extension cord.
Do not connect many devices to one AC outlet.
 
■ 
 
an electric shock, the unit falling, etc.
■ When plugging the power supply plug into the outlet, make sure that there is
no dust, blockage, or loose parts both in the outlet and on the plug. Verify that
the power supply plug is completely in the outlet.
If there is dust, blockage, or loose parts on the power supply plug or the outlet, it could

■ Securely attach the electrical cover to the indoor unit and the service panel to
the outdoor unit.
If the electrical cover of the indoor unit and/or the service panel of the outdoor unit are

an electric shock.
■ When installing, relocating, or servicing the unit, make sure that no substance

Any presence of foreign substance such as air can cause abnormal pressure rise and

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. Check that the refrigerant gas
does not leak after installation has been completed.
If refrigerant leaks during
installation, ventilate the room.
 
 
heater, space heater, stove, etc., harmful gases will be generated.
■ Use appropriate tools and piping materials for installation.
The pressure of R410A is 1.6 times higher than R22. Not using the appropriate
tools and materials, or improper installation could cause the pipes to burst causing
an injury.
■ When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes.
If the refrigerant pipes are disconnected while the compressor is running and the
stop valve is open, air could be drawn in and the pressure in the refrigeration cycle
could become abnormally high, causing the pipes to burst.
■ When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
If the compressor is started before the refrigerant pipes are connected and the
stop valve is open, air could be drawn in and the pressure in the refrigeration cycle
could become abnormally high, causing the pipes to burst.
■ 
 
■ Install the unit according to national wiring regulations.
■Depending on the installation area, install a Ground Fault Interrupt (GFI) circuit
breaker.
If the Ground Fault Interrupt (GFI) circuit breaker is not installed, an electric shock
could occur.
■Perform the drainage/piping work securely according to the installation manual.
If there is defect in the drainage/piping work, water could drip from the unit, and
damage household items.
■ 
This could cause injury.
■Do not install the outdoor unit where small animals may live.
If small animals enter the unit and damage its electrical parts, it could cause a

CAUTION
(Could lead to serious injury when operated incorrectly.)
WARNING (Could lead to death or serious injury.)
1. BEFORE INSTALLATION
JG79J423H01
ENGLISH
SPLIT-TYPE AIR CONDITIONERS
INSTALLATION MANUAL
When installing multi units, refer to the installation
manual of the multi unit for outdoor unit installation.
✱NTXWST36A112A✱
✱NTYWST36A112A✱
Required Tools for Installation
Phillips screwdriver
Level
Scale
Utility knife or scissors
3 in. (75 mm) hole saw
Torque wrench
Wrench (or spanner)
5/32 in. (4 mm) hexagonal wrench
Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer

1-3. SPECIFICATIONS
1-3-1. POWER SUPPLY AND INDOOR/OUTDOOR WIRE
CONNECTION
 
 
 
 
Connecting wires and the ground wire
 
 or stranded conductor  .
 
 
* Follow local electrical codes.
Power supply cable and ground wire
 
 10.
 
* Follow local electrical codes.
Note:
When the indoor unit is powered from the outdoor unit, depending on
local code, a disconnect switch needs to be installed to a power supply
circuit.
Pipe length
Up to 25 ft. (7.5 m) No additional charge is required.
Exceeding 25 ft. (7.5 m) Additional charge is required.
(Refer to the table below.)
 
refrigerant (R410A) charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 25 ft.
[7.5 m])
Limits
Pipe length 100 ft. (30 m) max.
Height difference 50 ft. (15 m) max.
No. of bends 10 max.
 
 
 
 
1-3-2. REFRIGERANT PIPES
 
 
CAUTION

Excessive insulation may cause incorrect installation of the indoor unit,
and too little insulation may cause condensate to form.
Pipe
Outside
diameter

thickness
Insulation
thickness Insulation material
inch (mm)
For liquid 3/8 (9.52) 0.0315 (0.8) 5/16 (8) Heat resistant foam plas-

For gas 5/8 (15.88) 0.0394 (1.0) 5/16 (8)

 ✱NTYWST36A112A✱✱NTXWST36A112A✱
INDOOR UNIT
Power supply
 208/230, 1, 60
 (A) 1.0
Fan motor (F.L.A.) (A) 0.76
OUTDOOR UNIT
Power supply
 208/230, 1, 60

(time delay) (A) 25
 (A) 21
Fan motor (F.L.A.) (A) 0.93
Compressor (R.L.A) (A) 16
(L.R.A) (A) 20
Control voltage Indoor unit - Remote controller: (Wireless)
Indoor unit - Outdoor unit: DC12-24 V (Polar)
1-2. SELECTING THE INSTALLATION LOCATION
Refrigerant to be added NTXWST30/36A112A✱
NTYWST30/36A112A✱
INDOOR UNIT
 
 
 
 Do not expose
to direct sunlight also during the period following unpack-
ing to before use.
 
 
radio. Operation of the air conditioner may interfere with

the affected device.
 
incandescent lights (so the infrared remote control can
operate the air conditioner normally).


Note:
Install the indoor unit high on the wall where air can
distribute over the entire room.
REMOTE CONTROLLER
 
 
 
Check that signals from the remote controller from
that position are received by the indoor unit (‘beep’
or ‘beep beep’ receiving tone sounds). Then, attach
remote controller holder to a pillar or wall and install
wireless remote controller.
Note:

the signal from the wireless remote controller may not be
received.
OUTDOOR UNIT
 
 
 
or hot air.
   
increase of operation sound or vibration.
 
 
be sure to secure the unit legs.
  
of TV set or radio. Operation of the air conditioner may
interfere with radio or TV reception in areas where recep-

device.
 
      
blowing snow. In areas with heavy snow, please install

Note:
 
so as to reduce vibration.
         
location where continuous direct sunlight or excessive
water can be avoided as much as possible.
Note:
When operating the air conditioner in low outside tem-
perature, be sure to follow the instructions described
below.
 
inlet/outlet side may be exposed directly to wind.
 
with its air inlet side facing the wall and

on the air outlet side.
Avoid the following places for installation where air
conditioner trouble is liable to occur.
 
 
in the air.
 
oily smoke (such as cooking areas and factories, in
which the properties of plastic could be changed and
damaged).
 
 
 
         
including phthalate compounds, formaldehyde, etc.,
which may cause chemical cracking.

Indoor unit
Wall hole
sleeve (C)
Cut off the
extra length.
Pipe attach-
ment strap
(E)
Use the wall hole sleeve
(C) to prevent indoor/
outdoor connecting wire
(A) from contacting metal
parts in the wall and to
protect the wiring from
rodents.
Wall hole cover (D)
Attachment screw (F)
Outdoor unit installation
2-13/16 in. (70
mm) or more/
5-1/8 in. (130 mm)
or more for left and
left back piping
(using spacer)
1-4. INSTALLATION DIAGRAM
ACCESSORIES
Check the following parts before installation.
<Indoor unit>
(1) Installation plate 1
(2)
Attachment screws for the installa-
tion plate
4 × 25 mm
7
(3) Remote controller holder 1
(4)
Screws for the remote controller
holder
3.5 × 16 mm (Black)
2
(5) Battery (AAA) for (6) 2
(6) Wireless remote controller 1
(7) Felt tape
(For left or left-rear piping) 2
(8)  2
(9) Charge nut 1
(10) L-joint 1
FIELD-SUPPLIED PARTS
(A) Indoor/outdoor unit connecting wire *1 1
(B) Extension pipe 1
(C) Wall hole sleeve 1
(D) Wall hole cover 1
(E) Pipe attachment strap
2 to 5
(F) Screw for (E) 4 × 20 mm 2 to 5
(G) Piping tape 1
(H) Putty 1
(I)
Drain hose
(or soft PVC hose, 19/32 in. [15
mm] inner diameter or hard PVC
pipe VP16)
1
(J) Refrigerant oil 1
(K) Power supply cord*1 1
Units should be installed by licensed contractor
according to local code requirements.
Note:
*1 Place indoor/outdoor unit connecting wire
(A) and power supply cord (K) at least 3 ft.
(1 m) away from the TV antenna wire.
Unit: inch
Unit: mm
4-11/16 in.
(120 mm)
or more
Space for indoor unit working
Please leave the space as shown in the
picture for maintenance usage.
After the leak test, apply insulating mate-
rial tightly so that there is no gap.
33-1/16
14-3/16
19-11/16
Air inlet
3-15/16
15-14/32
13
Air outlet
4-3/8 x 13/16 slot 1-18/32
40
840
100 500
Air inlet
392 330 360
Air outlet
4-10 x 21 slot
When the piping is to be attached to a wall
comprised of tin plate or metal netting, use
chemically treated wooden piece 25/32 in.
(20 mm) or thicker between the wall and
the piping, or wrap insulation vinyl tape 7 to
8 turns around the piping.
To use existing piping, perform COOL
operation for 30 minutes and pump down
before removing the old air conditioner.

for new refrigerant.
5/16 in. (7 mm)
or more
4 in.
(100 mm)
or more
4 in.
(100 mm)
or more
14 in.
(350 mm)
or more
20 in.
(500 mm)*3
or more
Note:
Do not
obstruct
the air
outlet.
Indoor unit
Installation
plate
Space
9-27/32 in. (250
mm) or more
4 in. (100 mm)
or more
8-11/16 in.
(220 mm)
or more
clear *2
*2 20 in. (500 mm) or more when
front and sides of unit are clear
*3 When any 2 sides of left, right
and rear of unit are clear
Seal the wall hole
gap with putty (H).
Attach the pipe to
wall with pipe at-
tachment strap (E).

Installation plate (1)
Center of
ø 3 in.
(75 mm)
hole
8-11/16 in.
(220 mm)
or more
4-11/16 in.
(120 mm)
or more
2-13/16 in. (70 mm) or more
5-1/8 in. (130 mm) or more for left
and left back piping (using spacer)
Ceiling
Wall Wall
Attachment screw (2)
* Same for left hole.
Insert
the
scale. *
Align the
scale with
the line. *
Level
 -

2-1. ATTACHING THE INSTALLATION PLATE
 

 
the holes indicated in the illustration. For added support, additional screws may also be
installed in other holes.
 
Wall
Outdoor side
2-2. DRILLING
1) Determine where the holes will be located on the wall.
2) Drill a ø 3 in. (75 mm) hole. The outdoor side should be 6/32 to 9/32 in. (5 to 7 mm) lower
than the indoor side.
3) Insert wall hole sleeve (C).
2-3. CONNECTING WIRES FOR INDOOR UNIT
Note:
When the indoor unit is powered from the outdoor unit, depending on local code, a discon-
nect switch needs to be installed to a power supply circuit.
1) Open the front panel.
2) Place the upper part of the indoor unit on the installation plate.
3) Remove electrical cover.
4) Remove VA clamp.
5) Remove corner box.
6) Remove cable guide.
7) Remove conduit plate.
8) Attach conduit pipe (for rear piping) / elbow joint (for right, left, or downward piping) to
conduit plate with lock nut. The thread of the installed conduit pipe / elbow joint appearing
inside should be less than 3/8 in. (10 mm). (Fig. 1) Elbow joint should appear less than
1-3/16 in. (30 mm) outside. (Fig. 2)
9) Process the end of ground wire (Fig. 3). Connect it to the ground terminal of electrical parts
box.
10) Process the end of indoor/outdoor unit connecting wire (A) (Fig.3). Attach it to the terminal
block. Be careful not to make mis-wiring. Attach the wire to the terminal block securely
so that its core cannot be seen, and no external force affects the connecting section of
the terminal block.
11) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fastened.
12) Reinstall conduit plate.
13) Reinstall cable guide.
14) According to the piping direction, remove the shaded part of the left side of box (Fig.4)
or corner box (Fig. 5).
15) Reinstall VA clamp.
16) Reinstall electrical cover.
17) Reinstall panel assembly.
6/32-9/32 in.
(5-7 mm)
ø 3 in.
(75 mm)
Lead
wire
5/8 in.
(15 mm)
2-3/16 in.
(55 mm)
Less than 3/8 in.
(10 mm)
Conduit plate
Conduit pipe or
elbow joint
Lock nut
Elbow joint
(for right, left, or downward piping)
Less than 1-3/16 in.
(30 mm)
Fig. 1 Fig. 2
Fig. 3 Fig. 4
Corner box
Remove panel
for piping on right
side of unit
Remove panel for
piping on bottom
side of unit Fig. 5
Box
Remove panel for piping
on bottom left side of unit
Remove panel
for piping on
left side of unit
4 in.
(100 mm)
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.
Power supply
208/230 V AC,
1phase 2 wires,

INDOOR UNIT
Terminal block
208/230 V AC

OUTDOOR UNIT
Terminal block 1
Ground Grounding terminal**
Grounding
terminal**
Disconnect
switch*
Pull tab to remove cable guide.
 
terminals
 
slack in the connecting wires.
Electrical cover
VA Clamp
Indoor
terminal
block
Electrical box
Cable guide
Grounding
terminal
Conduit pipe
Lock nut
Conduit plate
Elbow joint
Conduit plate
or
2. INDOOR UNIT INSTALLATION

Liquid pipe Gas pipe
Felt tape (7)
Indoor/outdoor unit
connecting wire (A)
Piping tape (G)
2-5. PIPE FORMING AND DRAIN PIPING
2-5-1. PIPE FORMING
 
 
 
 
supplied).
Note:

screws.
Left or left-rear piping
Note:
Be sure to reattach the drain hose and the drain cap if the piping is being installed on left
or bottom left of unit, otherwise, water could drip down from the drain hose.

the end.
Felt tape (7) overlap width should be 1/3 the tape width. Use a bandage stopper at the
end of felt tape (7).
2) Pull out the drain cap at the back right of the indoor unit. (Fig. 1)
 
3) Pull out the drain hose at the back left of the indoor unit. (Fig. 2)
 
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)
 
pan.
5) Insert the drain hose fully into the drain pan at the back right of the indoor unit. (Fig. 4)
 
drain pan.
6) Insert the drain hose into wall hole sleeve (C), and attach the upper part of indoor unit onto
the installation plate (1). Then, shift the indoor unit completely to the left to make placing
the piping in the back of the unit easier.
7) Cut out two pieces of cardboard from the shipping box (use any two pieces of the four
pieces), roll each piece, hook them onto the back rib, and use them as spacer to lift the
indoor unit. (Fig. 5)
8) Connect the refrigerant piping with the extension pipe (B).
9) Attach the lower part of the indoor unit into the installation plate (1).
Drain cap
Drain hose
Drain cap
Drain hose
Fig. 1 Fig. 2
Fig. 3 Fig. 4
Fig. 5
2-4. INSTALLING THE L-JOINT
1) Install L-joint (10) on the back of the unit. Position L-joint (10) according to the piping
direction. (Fig. 1)
In case of bottom piping (Fig. 2)




3) Install charge nut (9) to the liquid refrigerant piping, which connects the indoor and outdoor
unit.
4) Perform leak test of joint part (the part tightened in “2)”), the nut on the gas side should
remain installed.
5) Slide pipe cover of L-joint (10) and cover the joint. (Fig. 5)
Fig. 1 Fig. 2
Fig. 3
Fig. 4 Fig. 5
Remove panel for
piping on bottom
right side of unit
Remove panel
for piping on right
side of unit
Cut
Tightening
direction
Remove panel for piping on
left side of unit.
Piping tape (G)
Felt tape (7)
Slide the pipe cover
completely to the end.

3-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Remove the conduit cover.
3) Attach the conduit connector to conduit cover with lock nut then secure it against unit
with screws.
4) Connect ground wires of indoor/outdoor unit connecting wire (A) and power supply cord
(K) to the TB support.
5) Loosen the terminal screw, and attach indoor/outdoor unit connecting wire (A) from the
indoor unit correctly on the terminal block. Attach the wire to the terminal block securely
so that its core cannot be seen, and no external force affects the connecting section of
the terminal block.
6) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fastened.
7) Connect power supply cord (K).
8) Install the conduit cover.
9) Install the service panel securely.
Terminal block
to conduit cover
Power supply cord (K)
Power supply cord (K)
Indoor/outdoor unit
connecting wire (A)
 

 
connecting wires.
Lead
wire
5/8 in.
(15 mm)
1-3/8 in.
(35 mm)
Service panel Lock nut
Conduit cover
Connector
Grounding
terminal
2-5-2. DRAIN PIPING
 -

 
 
supplied drain hose (I). (Fig. 2)
 
securely into the pipe. (Fig. 3)
Do not make drain piping as shown below.
Do not raise Accumulated
drain water
Air
Waving
Water
leakage
Water
leakage
Water
leakage
Tip of drain
hose dipped
in water
Ditch
At least
1-31/32 in.
(50 mm)
gap
Downward
slope
Drain
hose
Soft hose
I.D. 19/32 in.
(15 mm)
Drain hose
Hard vinyl chloride pipe
I.D. 1-3/16 in.
(30 mm)
Insert
securely
Different
diameter
joint
27-9/16 in.
(70 cm)
or more
Fig. 1 Fig. 2 Fig. 3
Rear or bottom piping

from the end.
2) Insert the piping and the drain hose into the wall hole sleeve (C), and attach the upper
part of the indoor unit on the installation plate (1).
3) Check if the indoor unit is attached securely on the installation plate (1) by moving the unit
to left and right.
4) Attach the lower part of the indoor unit into the installation plate (1).
Right piping
Note:
Before performing the following, make sure that wiring is completed, and the conduit cover
is installed. (Refer to 2-3.)
1) Place the refrigerant piping and the drain hose together, shift them to left side of the unit,

2) Insert the piping and the drain hose into the wall hole sleeve (C), and attach the upper
part of the indoor unit on the installation plate (1).
3) Check if the indoor unit is attached securely on the installation plate (1) by moving the unit
to left and right.
4) Attach the lower part of the indoor unit into the installation plate (1).
Cut off in case of down-
ward piping.
TB support
3. OUTDOOR UNIT INSTALLATION

3-2. FLARE CONNECTION
1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)
2) Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to
avoid getting metal shavings into the piping. (Fig. 3)

4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the table. Select
A inch (mm) from the table according to the tool you use.
5) Check
 
 
3-3. PIPE CONNECTION
 
 
 
in burns or frostbite.
Indoor unit connection
Connect both liquid and gas piping to indoor unit.
 -
frigeration oil on screw threads. Excessive tightening torque will result in damage on the
screw.
 
 

Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit following the same procedure
detailed in Indoor unit connection.
 
3-4. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, insulate the piping, including valves.
3) Apply piping tape (G) starting from the connection on the outdoor unit.
 
-
tion.
Copper
pipe
Good
Tilted
No good
Fig. 1 Fig. 2
Burr Copper pipe
Spare reamer
Pipe cutter
Fig. 4
Fig. 3
Smooth all around
Even length
all around
Inside is shin-
ing without any
scratches.
Fig. 5
Fig. 6
Flare nut
Die
Copper pipe
Clutch type
Flaring tool
Wing nut type
Pipe diameter
inch (mm)
B
inch
(mm)
A inch (mm) Tightening torque
Clutch
type tool
for R410A
Clutch
type tool
for R22
Wing nut
type tool
for R22
ft-lb
 
ø 1/4 (6.35) 21/32
(17)
0 to 0.02
(0 to 0.5)
0.04 to 0.06
(1.0 to 1.5)
0.06 to 0.08
(1.5 to 2.0)
10 to 13
(140 to 180) 13.7 to 17.7
ø 3/8 (9.52) 7/8 (22) 25 to 30
(350 to 420) 34.3 to 41.2
ø 1/2 (12.7) 1-1/32
(26) 0.08 to 0.10
(2.0 to 2.5)
36 to 42
(500 to 575) 49.0 to 56.4
ø 5/8 (15.88) 1-5/32
(29)
54 to 58
(750 to 800) 73.5 to 78.4
4-1. PURGING PROCEDURES AND LEAK TEST
1) Remove service port caps from stop valves on both sides of refrigerant lines. (The stop
valves are fully closed when shipped.) Leave closed.
2) Connect gauge manifold to ports of stop valves.
3) Evacuate the system to 4000 microns from both service valves. System manifold gauges
must not be used to measure vacuum. A micron gauge must be used at all times. Break
the vacuum with Nitrogen(N2) into the discharge service valve to 0 PSIG.
4) Evacuate the system to 1500 microns. Break the vacuum with Nitrogen(N2) into the
discharge service valve to 0 PSIG.
5) Evacuate the system to 500 microns.
6) Close gauge manifold valves, stop the pump, and conduct a 30 minute rise test.
7) System should hold 500 microns for a minimum of 1 hour.
8) Fully open all stop valves on both sides of gas pipe and liquid pipe. Operating without
fully opening lowers the performance and this causes trouble.
9) Refer to 1-3 and charge the prescribed amount of additional 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.
10) Remove gauge manifolds and replace service port caps and tighten.
11) Leak test
Uneven Burred
WARNING
When installing the unit, securely connect the refrigerant pipes before starting the
compressor.
B
Stop valve for
GAS
Stop valve cap
(Torque 15 to
22 ft-lb, 19.6 to


Vacuum pump (or the vacuum
pump with the function to

Gauge manifold valve
(for R410A)
Compound pressure gauge
(for R410A)
–14.7 psi [Gauge]

Handle
Low Handle High
Adapter for
preventing the

Charge hose
(for R410A)
*Close
*Open
Hexagonal wrench
Precautions when using the control valve When attaching the control valve
to the service port, valve core may
deform or loosen if excess pressure
is applied. This may cause gas leak.
Service port
Charge hose
Body
Close
Open
Control valve
A
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.
Service port cap
(Torque 10 to 13 ft-Ib,
140
to 180 kgfcm)
*4 to 5 turns
Stop valve for LIQUID
Pressure gauge
(for R410A)
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

4-4. EXPLANATION TO THE USER
 

remote controller from the remote controller holder, cleaning methods, precautions
for operation, etc.)
 
Caution:
              
E.O. SW or the remote controller before turning off the power supply. If this
procedure is not performed, the unit will automatically begin operation when
power supply is resumed.
To the user
 
            
service representative to deactivate the function. Refer to the service manual
for details.
4-2. TEST RUN
1) Insert power supply plug into the power outlet and/or
turn on the breaker.
2) Press the E.O. SW once. Test run will be performed for
30 minutes. If the left operation indicator light blinks every
0.5 seconds, inspect the indoor/outdoor unit connecting
wire (A). After the test run, emergency COOL mode (75ºF
[24ºC] COOL) will start.
3) To stop operation, press the E.O. SW several times until
all LED lamps turn off. Refer to operating instructions for
details.
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller and listen for an audible indicator
from the indoor unit. Press the ON/OFF button again to turn the air conditioner off.
 
will not operate for 3 minutes to protect the air conditioner.
4-3. AUTO RESTART FUNCTION
This product is equipped with an auto restart function. When the power supply is cut off
during operation, such as during blackouts, the function automatically starts opera-
tion in the previous setting once the power supply is resumed. (Refer to the operating
instructions for details.)
5-3. PUMPING DOWN
When relocating or disposing of the air conditioner, pump down the system following
the procedure below so that refrigerant is not released into the atmosphere.
1) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe
side of the outdoor unit.
2) Fully close the stop valve on the liquid pipe side of the outdoor unit.
3) Close the stop valve on the gas pipe side of the outdoor unit almost completely so that

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
(  .
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.
5-1. REMOVING AND INSTALLING THE PANEL ASSEMBLY
Removal procedure (Fig. 1, 2)
1) Remove the three screws that attach the panel assembly.
2) Open the front panel.
3) Remove the two screws that attach the panel assembly.

5-2. REMOVING THE INDOOR UNIT
Remove the bottom of the indoor unit from the installation plate. (Fig. 1, 2)
 
 
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.
Installation procedure (Fig. 3, 4)


3) Fit in the top of the panel assembly.
4) Fit in the bottom of the panel assembly and tighten it using screws.
5) Push the section of the front panel marked by the arrows to close the front panel
securely.
Emergency operation switch
(E.O. SW)
Fig. 3  Fig. 4
Square hole
Push Lower
Corner box
Fig. 1 Fig. 2
Fig. 1 Fig. 2
When pumping down the refrigerant, stop the compressor before disconnecting
the refrigerant pipes. The compressor may burst if air etc. get into it.
WARNING
MITSUBISHI ELECTRIC TRANE HVAC US LLC
HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024, USA
5. RELOCATING THE UNIT / MAINTENANCE
Publication No. DL-SVN012A-EN Published Dec. 2018