MSZ-GS24NA Split Type Air Conditioners

Product Information: MSZ-GS24NA MSY-GS24NA

Specifications:

• Model: MSZ-GS24NA MSY-GS24NA
• Type: Split-type Air Conditioner
• Installation Manual: JG79N508H03

Required Tools for Installation:

• Phillips screwdriver
• 5/32 inch (4 mm) hexagonal
• Level wrench
• Scale
• Flare tool for R410A
• Utility knife or scissors
• Gauge manifold for R410A
• 3 inches (75 mm) hole saw
• Vacuum pump for R410A
• Torque wrench
• Charge hose for R410A
• Wrench (or spanner)
• Pipe cutter with reamer

Product Usage Instructions:

1. Before Installation:

1-1. The Following Should Always Be Observed for Safety:

Warning: Do not install the unit by yourself
(user). Improper or incomplete installation could cause fire,
electric shock, injury due to the unit falling, or water leakage.
Consult a qualified installer or the dealer from whom you purchased
the unit.

Follow the instructions detailed in the installation
manual: Incomplete installation could cause fire or
electric shock, injury due to the unit falling, or leakage of
water.

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.

Do not alter the unit: It may cause fire,
electric shock, injury, or water leakage.

Perform electrical work according to the installation
manual and use an exclusive circuit: Do not connect other
electrical appliances 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.

Ground the unit correctly: Do not connect the
ground wire to a gas pipe, water pipe, lightning rod, or telephone
ground. Defective grounding could cause electric shock.

Do not damage the wires: Damaged wires could
cause fire.

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.

Use specified wires to securely connect the indoor and
outdoor units: Attach the wires firmly to avoid applying
stress to the terminal block. Improper connection could cause
fire.

Do not install the unit in a place where flammable gas
may leak: 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. It could cause a fire or an electric shock.

Use the parts provided or specified parts for the
installation work: The use of defective parts could cause
an injury or leakage of water due to a fire, an electric shock, the
unit falling, etc.

When plugging the power supply plug into the
outlet: Make sure that there is no dust, blockage, or
loose parts both in the outlet and on the plug. Verify that the
power supply plug is completely in the outlet. If there is dust,
blockage, or loose parts on the power supply plug or the outlet, it
could cause electric shock or fire. If loose parts are found on the
power supply plug, replace it.

FAQ:

Q: Can I install the unit by myself?

A: No, it is recommended to consult a qualified installer or the
dealer from whom you purchased the unit for proper installation.
Improper installation can lead to fire, electric shock, injury, or
water leakage.

Q: Can I connect other electrical appliances to the same

circuit as the unit?

A: No, it is important to use an exclusive circuit for the unit.
Connecting other electrical appliances to the same circuit can
result in insufficient power capacity, incomplete electrical work,
fire, or electric shock.

Q: Can I install the unit in a location where flammable gas may

leak?

A: No, it is not recommended to install the unit in a place
where flammable gas may leak. Gas leaks can accumulate around the
unit and may cause an explosion.

ENGLISH

MSZ-GS24NA MSY-GS24NA

JG79N508H03

SPLIT-TYPE AIR CONDITIONERS
INSTALLATION MANUAL

When installing multi units, refer to the installation manual of the multi unit for outdoor unit installation.

Required tools for installation

Phillips screwdriver

5/32 inch (4 mm) hexagonal

Level

wrench

Scale

Flare tool for R410A

Utility knife or scissors

Gauge manifold for R410A

3 inches (75 mm) hole saw

Vacuum pump for R410A

Torque wrench

Charge hose for R410A

Wrench (or spanner)

Pipe cutter with reamer

1. Before Installation

1-1. The Following Should Always Be Observed for Safety
· Be sure to read these safety precautions and instructions. · Be sure to observe the warnings and cautions specified here. · After reading this manual, be sure to store it with the OPERATING INSTRUCTIONS for future reference.
· Please report to your supply authority or obtain their consent before connecting this equipment to the power supply system.

Warning (Could lead to death or serious injury.)

Do not install the unit by yourself (user).
Improper or incomplete installation could cause fire, electric shock, injury due to the unit falling, or water leakage. Consult a qualified installer or the dealer from whom you purchased the unit.
Follow the instructions detailed in 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 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.
Do not alter the unit.
It may cause fire, electric shock, injury or water leakage.
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. 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.
Ground the unit correctly.
Do not connect the ground wire to a gas pipe, water pipe, lightning rod or telephone ground. Defective grounding could cause electric shock.
Do not damage the wires.
Damaged wires could cause fire.
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.
Use the specified wires to securely connect the indoor and outdoor units. At-
tach the wires firmly to avoid applying stress to the terminal block. Improper connection could cause fire.
Do not install the unit in a place where flammable gas may leak.
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. It could cause a fire or an electric shock.
Use the parts provided or specified parts for the installation work.
The use of defective parts could cause an injury or leakage of water due to a fire, an electric shock, the unit falling, etc.
When plugging the power supply plug into the outlet, make sure that there is
no dust, blockage, or loose parts both in the outlet and on the plug. Verify that the power supply plug is completely in the outlet. If there is dust, blockage, or loose parts on the power supply plug or the outlet, it could cause electric shock or fire. If loose parts are found on the power supply plug, replace it.

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 not attached securely, dust, water, etc. could collect in the unit and could cause a fire or an electric shock.
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 refrigerant 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. Check that the refrigerant gas
does not leak after installation has been completed. If refrigerant leaks during installation, ventilate the room. If refrigerant comes in contact with a fire, harmful gas could be generated. If refrigerant gas leaks indoors, and comes into contact with the flame of a fan 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.
Fasten a flare nut with a torque wrench as specified in this manual.
If fastened too tight, a flare nut could break and cause refrigerant leakage.
Install the unit according to national wiring regulations. When opening or closing the valve below freezing temperatures, refrigerant may
spurt out from the gap between the valve stem and the valve body, resulting in injuries.
Exercise caution when using any auxiliary heat source and follow all third party
manufacturer instructions and safety guidelines for installation and usage. Any auxiliary heat source connected to this unit via the CN24 connection must have an independent temperature control mechanism. Failure to install and maintain such temperature control mechanism may void the warranty for this unit. Mitsubishi Electric shall not bear any warranty obligation or other liability for any damage or loss in connection with such third party auxiliary heaters.

Caution (Could lead to serious injury when operated incorrectly.)

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.

Do not touch the air inlet or the aluminum fins of the outdoor unit.
This could cause injury.
Please wear protective equipment when you touch the base of the outdoor unit.
It could cause injury if you do not wear the protective equipment.
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 malfunction, smoke emission, or fire. Keep the area around the unit clean.

1-2. Selecting the Installation Location

Indoor Unit

Note:

Note:

· Where airflow is not blocked.

In rooms where inverter type fluorescent lamps are used, · It is advisable to make a piping loop near outdoor unit

· Where cool (or warm) air spreads over the entire room. the signal from the wireless remote controller may not be so as to reduce vibration.

· On a rigid wall to reduce the possibility of vibration.

received.

· For increased efficiency, install the outdoor unit in a

· Where it is not exposed to direct sunlight. Do not expose

location where continuous direct sunlight or excessive

to direct sunlight also during the period following unpack- Outdoor Unit

water can be avoided as much as possible.

ing to before use.

· Where it is not overly exposed to strong winds. If the

· Where it can be easily drained.

outdoor unit with defrosting function is exposed to a wind, Note:

· At a distance 3 feet (1 m) or more away from a TV and the defrosting time will be longer.

When operating the air conditioner in low outside tempera-

radio. Operation of the air conditioner may interfere with · Where airflow is good and dustless.

radio or TV reception. An amplifier may be required for · Where neighbours are not annoyed by operation sound

the affected device.

or hot (or cool) air.

· In a place as far away as possible from fluorescent and · Where rigid wall or support is available to prevent the

incandescent lights (so the infrared remote control can increase of operation sound or vibration.

operate the air conditioner normally).

· Where there is no risk of combustible gas leakage.

· Where the air filter can be removed and replaced easily. · If installing the unit in a location high above the ground,

· Where it is away from the other heat or steam source.

be sure to secure the unit legs.

Note:

· Where it is at least 10 feet (3 m) away from the antenna

Install the indoor unit high on the wall where air can distribute of TV set or radio. Operation of the air conditioner may

over the entire room.

interfere with radio or TV reception in areas where recep-

tion is weak. An amplifier may be required for the affected

Remote Controller

device.

· Where it is convenient to operate and easily visible. · Where children cannot easily touch it.

· Install the unit horizontally.
· Please install it in an area not affected by snowfall or blowing snow. In areas with heavy snow, please install

· Select a position about 4 feet (1.2 m) above the floor. a canopy, a pedestal and/or baffle boards.

Check that signals from the remote controller from that

position are received by the indoor unit (beep’ orbeep

beep’ receiving tone sounds). When the remote controller

holder is supplied, install it at a position from which the

ture, be sure to follow the instructions described below. · Never install the outdoor unit in a place where its air
inlet/outlet side may be exposed directly to wind. · To prevent exposure to wind, install the outdoor unit
with its air inlet side facing the wall and a baffle board on the air outlet side. Avoid the following places for installation where air conditioner trouble is liable to occur. · Where flammable gas could leak. · Where there is an excessive amount of machine oil in the air. · Where oil is splashed or where the area is filled with oily smoke (such as cooking areas and factories, in which the properties of plastic could be changed and damaged). · Salty places such as the seaside. · Where sulfide gas is generated such as a hot spring, sewage, waste water. · Where there is high-frequency or wireless equipment. · Where there is emission of high levels of VOCs, including phthalate compounds, formaldehyde, etc., which may cause chemical cracking.

indoor unit can receive signals.

1-3. Specifications
1-3-1. Power Supply and Indoor/Outdoor Wire Connection · Power should be taken from an exclusive branched circuit. · Wiring work should be based on applicable technical standards. · Wiring connections should be made following the diagram. · Securely tighten screws.
Connecting wires and the ground wire · Use solid conductor Min. AWG14 or stranded conductor Min.
AWG14. · Use double insulated copper wire with 600 V insulation. · Use copper conductors only. Follow local electrical codes. Power supply cable and ground wire · Use solid or stranded conductor Min. AWG12. · Use copper conductors only. Follow local electrical codes.

Electrical specifications

MODEL

INDOOR OUTDOOR

INDOOR UNIT

Power supply (V, PHASE, Hz)

Min. Circuit Ampacity

(A)

Fan motor (F.L.A.)

(A)

OUTDOOR UNIT

Power supply (V, PHASE, Hz)

Max. Fuse size (time delay) (A)

MSZ-GS24NA MSY-GS24NA

MUZ-GS24NA(H) MUY-GS24NA

MUZ-GS24NAHZ

208/230, 1, 60 1.0 0.73

208/230, 1, 60

20

20

Note:

Min. Circuit Ampacity

(A)

18

18

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

Fan motor (F.L.A.)

(A)

0.93

0.93

circuit.

MSZ

13.6

13.6

(R.L.A) (A)

MSY

13.6

–

Compressor

MSZ

17.0

17.0

(L.R.A) (A)

MSY

17.0

–

Control voltage

Indoor unit – Remote controller: (Wireless) Indoor unit – Outdoor unit: DC12-24 V (Polar)

1-3-2. Refrigerant Pipes · To prevent condensation, insulate the two refrigerant pipes.
Caution Be sure to use the insulation of specified thickness (table on the right). Excessive insulation may cause incorrect installation of the indoor unit, and too little insulation may cause condensate to form.
· Refrigerant pipe bending radius must be 4 inches (100 mm) or more. · The unit has flared connections on both indoor and outdoor sides. · Remove the valve cover from the outdoor unit, then connect the pipe. · Refrigerant pipes are used to connect the indoor and outdoor units. · Be careful not to crush or over bend the pipe in pipe bending. · Refrigerant adjustment… If pipe length exceeds 25 feet (7.5 m), ad-
ditional refrigerant (R410A) charge is required. (The outdoor unit is charged with refrigerant for pipe length up to 25 feet [7.5 m]) · Please carefully consider the indoor unit location when piping lengths are less than 16 feet (5 m) as there could be intermittent noises during normal operation that would be noticeable in very quiet environments.

Pipe
For liquid For gas

Outside diameter
1/4 (6.35) 5/8 (15.88)

Minimum wall thickness

Insulation thickness

inch (mm)

0.0315 (0.8) 5/16 (8)

0.0394 (1.0) 5/16 (8)

Insulation material
Heat resistant foam plastic 0.045 Specific gravity

Pipe length Height difference No. of bends

Limits 100 feet (30 m) max. 50 feet (15 m) max. 10 max.

Pipe length

Up to 25 feet (7.5 m)

No additional charge is required.

Exceeding 25 feet (7.5 m)

Additional charge is required. (Refer to the table below.)

Refrigerant to be added

MSZ-GS24NA MSY-GS24NA

1.08 oz. (20 g/m)

1-4. Installation Diagram

Accessories Check the following parts before installation.

(1) Installation plate

1

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.

Indoor unit
Wall hole sleeve (C)

Wall hole cover (D)
Seal the wall hole gap with putty (H).
Attach the pipe to wall with pipe attachment strap (E).

2-1/8 inches (55 mm) or more / 4-5/8 inches (118 mm) or more for left and left back piping (using spacer)

Attachment screws for the installa-

(2) tion plate

7

term4 i×na2l5bmlomck securely so that (3) Wireless remote controller

the

cores

cannot 1

be

seen,

and

no

external

force(51a-47fm9f/e8omcrienmtsc)hoers

(4)

Felt tape (For left or left-rear piping)

1

Cut off the extra length.

Pipe fixing band (E)
Fixing screw (F)

(5) Remote controller holder

1

Screws for the remote controller

(6) holder

2

3.5 × 16 mm (Black)

(51-41m0/2omrienmc)hoers

3/8 inch (10 mm) or more

(7) Battery (AAA) for (3)

2

(8) Air cleaning filter

2

Field-supplied parts (A) Indoor/outdoor unit connecting wire *1 1

After the leak test, apply insulating material tightly so that there is no gap.

5.9 to 7.5 feet (1.8 to 2.3 m) from the floor is recommended

(B) Extension pipe

1

(C) Wall hole sleeve

1

Cover the connection part with tape to prevent water from leaking.

(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

3. RemDroavinehfloasree nuts attached to indoor and outdoor units, then put them on pipe. (I) (or soft PVC hose, 15 mm inner diam- 1 eter or hard PVC pipe VP30)

(J·) ·

CIfD(eooftlremraarsripneooafrhitrshoePasdVterehdCfeePhcfVlotaiCsvreeep,d,i1pcw5euomtVroPmkf1fwi6tnhi)ntehersFdeigica.tmi6o-.n

0 or 1 and repeat

procedure.

(K) Power supply cord*1

1

clear *2

Note: *1 Place indoor/outdoor unit connecting wire (A)
and power supply cord (K) at least 3 feet (1 m) away from the TV antenna wire.
Units should be installed by licensed contractor according to local code requirements.

(o14r0mi0nocmrhemes)

4(1io0nr0cmhmeomsre)

Note: · The dimensions indicated in the arrows ( ) above
show the required space to guarantee performance of the air conditioner. Install the outdoor unit where the

clear *3

(o13r45m0inomcrehme)s

maximum possible space can be provided, considering

··· FWTlpaaohthesweetreencrrneofualofoslslacaitnraegegtnei/onehmnude,atatsywotienofitarghvtlliigpacaheebttsroo,f,ruofqlotraumr1ree0rae%wnnpcuraaeetitrnmstach.nahedyapetslahvcseeepneewtfucfhiiacfeilieleryednbscinrhyeotaohrktfeatanbdleca*au2bsoWmevoherere.efnrigfreornatnat nledaskiadgees.of unit are clear, 20 inches (500 mm) or

cycle is likely occur due to poor ventilation. Installing the

*3 When any 2 sides of left, right and rear of unit are clear, 20

air outlet guide (optional) can improve performances.

inches (500 mm) or more

· If air from the outlet blows against the wall, it may cause

stains on the wall.

· To connect, first align the center, then tighten the first 3 to 4 turns of flare nut by hand. using two wrenches. EDdxiosccenhsoastirvgtaeekdteigbihnytetohntehineogrudutlanemittsaaidgrieresctthlye. flare section.

15-3/8 13
Air inlet 13-3/4~14-5/8

When the piping is to be attached to a wall comprised of tin plate or metal netting, use chemically treated wooden piece 25/32 inch (20 mm) or thicker between the wall and the piping, or wrap insulation vinyl tape around the piping. To use existing piping, perform COOL operation for 30 minutes and pump down before removing the old air conditioner. Remake flare according to the dimension for new refrigerant.
Do not block the inlet of the outdoor unit with the excess part of the pipes.

Outdoor unit installation

Unit: inch

6-7/8

33-1/16 19-11/16

Air inlet

Air outlet

2-3/8 x 13/16 slot

1-9/16

Unit: mm 840

175

500

Air inlet

390 330 Air inlet 349~371

1m5(-o43r0/e40inmcmheosromr ore)3m9(-o13r0/e800incmhmesooTrrimghortee)n the flare nut

Air outlet

2-10 x 21 slot

40

Drain piping for outdoor unit Inshtaulml tihdeityuanritehhoirgizho, nutsaellya.dditional field-supplied insulation to prevent condensation. Do not use drain socket in cold regions. Drain may freeze and make the fan stop. The outdoor unit produces condensate during the heating operation. Select the installation place to ensure to prevent the outdoor unit and/or the grounds from being wet by drain water or damaged by frozen drain water.

2. Indoor Unit Installation

2-1. Attaching the Installation Plate
· Find a stud in the wall to attach installation plate (1) horizontally by tightening the fixing screws (2) firmly.
· To prevent installation plate (1) from vibrating, be sure to install the attachment screws in the holes indicated in the illustration. For added support, additional screws may also be installed in other holes.
· When the knockout is removed, apply vinyl tape to the knockout edges to prevent damaging the wires.
· When the indoor unit is to be attached to a concrete wall using recessed bolts, secure installation plate (1) using 7/16 inch x 13/16 inch · 7/16 inch x 1 inch (11 mm × 20 mm · 11 mm × 26 mm) oval hole (17-3/4 inches [450 mm] pitch).
· If the recessed bolt is too long, change it for a shorter one (field- supplied).

Installation plate (1)
5-7/8 inches (149 mm) or more
Wall

Ceiling Level

2 1/8 inches (55 mm) or more 4 5/8 inches (118 mm) or more for left and left back piping (using spacer)

5 1/2
inches (140 mm) or more

4 inches

(100 mm)

Wall

2-2. Drilling

1. Determine where the holes will be located on the wall. 2) Drill a ø 3 inches (75 mm) hole. The outdoor side should be 6/32 to 9/32 inch (5 to 7 mm)
   lower than the indoor side. 3) Insert wall hole sleeve (C).
   2-3. Connecting Wires for the Indoor Unit
   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.
2. Remove the panel assembly. (Refer to 5-1.) 2) Place the upper part of the indoor unit on the installation plate. 3) Remove corner box R and electrical cover. 4) Remove display panel, conduit cover and conduit plate. 5) 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 inch (10 mm). (Fig. 1) Elbow joint should appear less than 1-3/16 inches (30 mm) outside. (Fig. 2) 6) Process the end of ground wire (Fig. 3). Connect it to the ground terminal of electrical parts box. 7) 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. 8) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fastened. 9) Reinstall conduit plate, conduit cover and display panel. 10) According to the piping direction, remove the shaded part of the corner box L (Fig. 4) or corner box R (Fig. 5). Reinstall electrical cover, corner box R and panel assembly.

Fixing screw (2)

Insert the scale. *

Align the scale with the line. *

Center of ø 3 inches (75 mm) hole

• Same for left hole.

ø 3 inches (75 mm)

Wall
6/32-9/32 inch (5-7 mm) Outdoor side

Electrical cover Fixing screw

Electrical box Grounding terminal

Conduit cover Display panel

Indoor terminal block

Lock nut Conduit plate

Conduit pipe (for rear piping)
or

Elbow joint (for right, left, or downward piping)

· Connect wires to the appropriate terminals · For future servicing, leave some slack in the connecting wires.

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.

INDOOR UNIT Terminal block

208/230 V AC, Grounding terminal** 1 phase, 60 Hz

OUTDOOR UNIT

Grounding terminal*
Disconnect switch

Terminal block 1

Ground
Power supply 208/230 V AC, 1 phase 2 wires, 60 Hz

Grounding terminal**

Conduit plate

Less than 3/8 inch (10 mm)
Lock nut Conduit pipe or elbow joint
Fig. 1

Conduit plate

Less than 1-3/16 inches (30 mm)

Elbow joint (for right, left, or downward piping)
Fig. 2

19/32 inch (15 mm)

Corner box L

Lead wire
· Make ground wire a little longer than others. (More than 2-3/8 inches [60 mm]) Fig. 3

Remove corner

box L for piping on

Box

left side of unit.

Remove corner box L for piping

on bottom left side of unit.

Fig. 4

Corner box R

Remove corner box R for piping on bottom side of unit.
Remove corner box R for conduit pipe on bottom side of unit.

Remove corner box R for piping on right side of unit.
Fig. 5

2-4. Pipe Forming and Drain Piping
2-4-1. Pipe Forming · Place the drain hose below the refrigerant piping. · Make sure that the drain hose is not crowded or bent. · Do not pull the hose when applying the tape. · When the drain hose passes the room, be sure to wrap it with insulation material (field-
supplied). Note: Make sure not to damage the cover of refrigerant pipe when attaching it back on with screws.

Liquid pipe Gas pipe

Indoor/outdoor unit connecting wire (A)

Felt tape (4) Piping tape (G)

Left or left-rear piping Note: Be sure to reattach the drain hose and the drain cap if the piping is being installed on left or bottom left of unit, otherwise, water could drip down from the drain hose.

1. Place the refrigerant piping and the drain hose together, then firmly apply felt tape (4) from the end. Felt tape (4) overlap width should be 1/3 the tape width. Use a bandage stopper at the end of felt tape (4).
2. Pull out the drain cap at the back right of the indoor unit. (Fig. 1) · Hold the convex section at the end and pull the drain cap.
3. Pull out the drain hose at the back left of the indoor unit. (Fig. 2) · Hold the claw marked by the arrows and pull out the drain hose forward.
4. Put the drain cap into the section to which the drain hose is to be attached at the rear of the indoor unit. (Fig. 3) · Insert a screwdriver into the hole on the cap and insert the cap fully into the drain pan.
5. Insert the drain hose fully into the drain pan at the back right of the indoor unit. (Fig. 4) · Check if the hose is hooked securely to the projection of its inserting part at the drain pan.
6. Insert the drain hose into wall hole sleeve (C), and attach the upper part of indoor unit onto the installation plate (1). Then, shift the indoor unit completely to the left to make placing the piping in the back of the unit easier.
7. Cut out 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).
   Rear or bottom piping 1) Place the refrigerant piping and the drain hose together, then firmly apply piping tape (G)
   from the end. 2) Insert the piping and the drain hose into the wall hole sleeve (C), and attach the upper
   part of the indoor unit on the installation plate (1). 3) Check if the indoor unit is attached securely on the installation plate (1) by moving the unit
   to left and right. 4) Attach the lower part of the indoor unit into the installation plate (1).
   Right piping Note: Before performing the following, make sure that wiring is completed, and the conduit cover is installed. (Refer to 2-3.) 1) Place the refrigerant piping and the drain hose together, shift them to left side of the unit,
   and then firmly apply piping tape (G) from the end. 2) Insert the piping and the drain hose into the wall hole sleeve (C), and attach the upper
   part of the indoor unit on the installation plate (1). 3) Check if the indoor unit is attached securely on the installation plate (1) by moving the unit
   to left and right. 4) Attach the lower part of the indoor unit into the installation plate (1).

Piping tape (G) Felt tape (4)

Cut off in case of left piping. Drain cap

Drain cap

Fig. 1
Drain cap Fig. 3

Drain hose

Fig. 2

Drain hose

Fig. 4

Fig. 5

Remove corner box R for piping on bottom side of unit.

Remove corner box R for piping on right side of unit.

To the left

2-4-2. Drain Piping · Do not cut the drain hose of the unit. (Fig. 1) · If the extension drain hose has to pass through a room, be sure to wrap it with insula-
tion (field-supplied). · The drain hose should point downward for easy drain. (Fig. 2) · If the drain hose provided with the indoor unit is too short, connect it with a field-supplied
drain hose (I). (Fig. 3) · When connecting the drain hose to a hard vinyl chloride pipe, be sure to insert it
securely into the pipe. (Fig. 4) · Make sure that no stress is applied to the connecting portion of the drain hose after
installing the indoor unit. Otherwise, breakage or water leakage may result. · Be sure to use the drain hose attached to the indoor unit. Otherwise, water leakage
or breakage due to chemical may result. · Do not apply any agent on the drain port. Doing so may cause breakage.
Do not put the drain pipe directly in a drainage ditch where Ammonia or Sulphuric gas may be generated. The evaporated corrosive gas may return to the indoor side through drain pipe and this may cause an unpleasant odor and corrosion on Heat exchanger may occur.

Fig. 1

Downward slope
Fig. 2

Drain hose

27-9/16 inches (70 cm) or more

Soft hose I.D. 19/32 inch (15 mm)

Different diameter joint

Fig. 3

Do not make drain piping as shown below.

Do not raise

Accumulated drain water
Air

Drain hose Hard vinyl chloride pipe I.D. 1-3/16 inches (30 mm)
Insert securely
Fig. 4

Tip of drain hose dipped in water

At least 1-31/32 inches (50 mm) gap

Water leakage

Water leakage

Waving

Water leakage

Ditch

3. Outdoor Unit Installation

3-1. Connecting Wires for the Outdoor Unit

1. Remove the service panel.

2. Remove the conduit cover.

3. Attach the conduit connectors to the conduit plate with lock nuts then secure it against

unit with screws.

4. Connect the ground wires of indoor/outdoor unit connecting wire (A) and power supply

cord (K) to the TB support.

5. Loosen the terminal screws, then attach indoor/outdoor unit connecting wire (A) and power

supply cord (K) from the indoor unit correctly to the terminal block. Attach the wires to the

terminal block securely so that the cores cannot be seen, and no external force affects

the connecting section of the terminal block.

Lead

6. Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fastened.

wire

7. Install the conduit cover.

8. Install the service panel securely.

Service panel Lock nut

Conduit pipe

Terminal block

5/8 inch (15 mm)

L1 L2
Power supply cord (K)

· Make ground wire a little longer than others. (More than 3-7/8 inches [100 mm])
· For future servicing, leave some slack in the connecting wires.
Grounding terminal

Conduit cover Conduit plate

TB support

to conduit cover

Indoor/outdoor unit connecting wire (A)
Power supply cord (K)

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) 3) Remove flare nuts attached to indoor and outdoor units, then put them on pipe. 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.
3. Check · Compare the flared work with Fig. 6. · If flare is defective, cut off the section and repeat procedure.

Pipe diameter inch (mm)
ø 1/4 (6.35) ø 3/8 (9.52) ø 1/2 (12.7) ø 5/8 (15.88)

B inch (mm)
21/32 (17)
7/8 (22)
1-1/32 (26)
1-5/32 (29)

A inch (mm)

Tightening torque

Clutch Clutch type Wing nut

type tool

tool

type tool

for R410A for R22

for R22

ft-lb (kgf·cm)

N·m

0 to 0.02 (0 to 0.5)

0.06 to

10 to 13 (140 to 180)

13.7 to 17.7

0.08

0.04 to 0.06

(1.5 to 2.0)

25 to 30 (350 to 420)

34.3 to 41.2

(1.0 to 1.5)

0.08 to

36 to 42 (500 to 575)

49.0 to 56.4

0.10

(2.0 to 2.5)

54 to 58 (750 to 800)

73.5 to 78.4

3-3. Pipe Connection
· Fasten flare nut with a torque wrench as specified in the table above. · When fastened too tight, flare nut may eventually break and cause refrigerant leakage. · Be sure to wrap insulation around the piping. Direct contact with the bare piping may
result in burns or frostbite.
Indoor unit connection Connect both liquid and gas piping to indoor unit. · Do not apply refrigeration oil on screw threads. Excessive tightening torque will result in
damage on the screw. · To connect, first align the center, then tighten the first 3 to 4 turns of flare nut by hand. · Use tightening torque table in (3-2.) as a guideline for indoor unit side joints, and tighten
using two wrenches. Excessive tightening damages the flare section.
Outdoor unit connection Connect pipes to stop valve pipe joint of the outdoor unit following the same procedure detailed in Indoor unit connection. · For tightening, use a torque wrench or spanner.
Warning
When installing the unit, securely connect the refrigerant pipes before starting the compressor.

3-4. Insulation and Taping

1. Cover piping joints with pipe cover. 2) For outdoor unit side, insulate the piping, including valves. 3) Apply piping tape (G) starting from the connection on the outdoor unit.
   · When piping has to be installed through a ceiling, closet or where the temperature and humidity are high, use additional field-supplied insulation to prevent condensation.

Copper pipe

Good 90°

No good

Fig. 1

Tilted Uneven Burred Fig. 2

Burr

Copper pipe

Spare reamer

Pipe cutter

Fig. 3

Flaring tool

Die

Copper pipe

Clutch type Wing nut type Fig. 4
Smooth all around

Flare nut Fig. 5
Inside is shining without any scratches.

Even length all around
Indoor unit connection

Fig. 6

Flare nut
Internal thread side Tighten the flare nut with a torque wrench.
Outdoor unit connection

Union joint
External thread side
Grip the nut on the union joint with a spanner.

4. Purging Procedures, Leak Test, and Test Run

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.

Valve stem (inside) Close
Open
Hexagonal wrench

Stop valve cap (Torque 15 to 22 ft-lb, 19.6 to 29.4 N·m, 200 to 300 kgfcm)

­14.7 psi [Gauge] (­0.101 Mpa)
Stop valve for LIQUID

Handle Low

Stop valve for GAS

Compound pressure gauge (for R410A)
Pressure gauge (for R410A)
Gauge manifold valve (for R410A)
Handle High
Charge hose (for R410A)

Service port cap (Torque 10 to 13 ft -Ib, 13.7 to 17.7 N·m, 140 to 180 kgf·cm)

Adapter for preventing the back flow
Vacuum pump (or the vacuum pump with the function to prevent the back flow)

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.

A Control valve

Service port

Open
Close Body

Charge hose

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. Test Run

1. Insert power supply plug into the power outlet and/or turn on the breaker.
2. Pressing the E.O. SW will perform a test run for 30 minutes.(For MSZ, pressing the switch once will perform COOL operation and twice will perform HEAT operation.) If the upper operation indicator light blinks every 0.5 seconds, inspect the indoor/ outdoor unit connecting wire (A). After the test run, emergency COOL mode (75°F [24°C] COOL) will start.
3. To stop operation, press the E.O. SW several times until all LED lamps turn off. Refer to operating instructions for details.

Emergency operation switch (E.O. SW)

Checking the remote (infrared) signal reception Press the OFF/ON button on the remote controller and listen for an audible indicator from the indoor unit. Press the OFF/ON button again to turn the air conditioner off. · Once the compressor stops, the restart preventive device operates so the compressor
will not operate for 3 minutes to protect the air conditioner.

4-3. Auto Restart Function
This product is equipped with an auto restart function. When the power supply is cut off during operation, such as during blackouts, the function automatically starts operation in the previous
setting once the power supply is resumed. (Refer to the operating instructions for details.)

Caution: · After test run or remote signal reception check, turn off the unit with the E.O. SW or the
remote controller before turning off the power supply. If this procedure is not performed, the unit will automatically begin operation when power supply is resumed. To the user · After installing the unit, explain to the user about auto restart function. · If auto restart function is unnecessary, it can be deactivated. Consult the service representative to deactivate the function. Refer to the service manual for details.

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 the valve stem of all stop valves on both sides of gas pipe and liquid pipe
   by the hexagonal wrench. If the valve stem hits the stopper, do not turn it any further. 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

4-4. Explanation to the User
· Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (the remote controller, removing the air filters, placing or removing the remote controller from the remote controller holder, cleaning methods, precautions for operation, etc.)
· Recommend that the user read the OPERATING INSTRUCTIONS carefully.

5. Relocation and Maintenance
5-1. Removing and Installing the Panel Assembly
Removal procedure (Fig. 1) 1) Remove the three screws that attach the panel assembly. 2) Remove the panel assembly. Be sure to remove its bottom end first.

Installation procedure (Fig. 2) 1) Install the panel assembly following the removal procedure in reverse. 2) Be sure to press the positions as indicated by the arrows in order to attach the assembly
completely to the unit.

• Do not hold the A part when installing/removing or carrying the panel, or the panel might be damaged.

Fig. 1 Fig. 2

A part : lower part of air outlet of the panel

5-2. Removing the Indoor Unit
Remove the bottom of the indoor unit from the installation plate. When releasing the corner part, release both left and right bottom corner part of indoor unit and pull it downward and forward as shown in the figure on the right.

If the above method cannot be used
Remove the panel. Then, insert hexagonal wrenches into the square holes on the left and right sides of the unit and push them up as shown in the following figure. The bottom of the indoor unit lowers and releases the hooks.

Square hole

Push

Lower

5-3. Pumping Down
When relocating or disposing of the air conditioner, pump down the system following the procedure below so that refrigerant is not released into the atmosphere. 1) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit. 2) Fully close the stop valve on the liquid pipe side of the outdoor unit. 3) Close the stop valve on the gas pipe side of the outdoor unit almost completely so that it can be easily closed fully when the pressure gauge shows 0 psi [Gauge] (0 Mpa). 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 (0.1 to 0 psi [Gauge] (0.05 to 0 Mpa)). 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.
Warning
When the refrigeration circuit has a leak, do not execute pump down with the compressor. When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst if air etc. get into it.

6. Connecting the Interface/Connector Cable to the Air Conditioner
· Connect the INTERFACE/CONNECTOR CABLE to the Indoor electronic control P.C. board of the air conditioner with the connecting cable. · Cutting or extending the connecting cable of the INTERFACE/CONNECTOR CABLE results in defects in connecting.
Do not bundle the connecting cable together with power supply cord, indoor/outdoor connecting wire, and/or earth wire. Keep as much distance as possible between the connecting cable and those wires. · The thin part of the connecting cable should be stored and placed where customers cannot touch it.

Connecting

Thin part of the connecting cable. Place this part where customers cannot touch it. Room air conditioner

Main body of an interface Connector

Indoor control P.C. board

CN105

Thick part of the connecting cable

(1) Remove the panel and the lower right corner part. (2) Open the cover of the indoor control P.C. board.
(3) Join the connecting cable to CN105 on the indoor control P.C. board.
(4) Hook the connecting cable as shown in the figure.
(5) Attach the cable clamp provided with Interface to the thick part of the connecting cable with a screw 4×16, then fit the cable into the ribs as shown in the figure.
(6) Close the cover of the indoor control P.C. board. Be careful not to catch the thin part of the connecting cable in the cover. Reinstall the panel and the lower right corner part.
Warning Fix the connecting cable at the prescribed position securely. Incorrect installation may cause electric shock, fire, and/or malfunction.

HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

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