Mitsubishi PUHY-P700YSGM-A, PUHY-P750YSGM-A, PUHY-P800YSGM-A Service Manual

Models PUHY-P700, P750, P800YSGM-A

Service Handbook

AIR CONDITIONERS CITY MULTI

Contents

1 Read Before Servicing ................................................................ 6

[1] Items to Be Checked .............................................................. 6

[2] Necessary Tools and Materials .............................................. 7

[3] Piping Materials ...................................................................... 8

[4] Storage of Piping Material ...................................................... 10

[5] Piping Machining .................................................................... 11

[6] Brazing.................................................................................... 12

[7]

Airtightness Test

...................................................................... 13

[8] Vacuuming .............................................................................. 13

[9] Vacuum Drying........................................................................ 14

[10] Changing Refrigerant.............................................................. 15

[11] Remedies to be taken in case of a refrigerant leak................ 15

[12]

Characteristics of the Conventional and the New Refrigerants

.. 16

[13] Notes on Refrigerating Machine Oil........................................ 17

2 Restrictions .................................................................................. 18

[1] Electrical Work & M-NET control ............................................ 18

[2] Types of Switch Setting and Address Setting ........................ 19

[3] Examples of system connection ............................................ 21

[4] Restrictions on Refrigerant Piping Length.............................. 35

3 Components of the Outdoor Unit ................................................ 36

[1] Appearance of the Components and Refrigerant Circuit........ 36

[2] Control Box ............................................................................ 41

[3] Circuit Board .......................................................................... 44

4 Remote Controller ........................................................................ 49

[1]

Functions and Specifications of MA and ME Remote Controllers

.... 49

[2] Group Setting and Interlocking Settings that are Made on

the ME Remote Controller .................................................... 50

[3]

Interlocking Setting that is Made on the MA Remote Controller

...... 53

[4] Switching to the built-in Thermo on the remote controller ...... 54

5 Electrical Wiring Diagram ............................................................ 55

[1] Compressor unit .................................................................... 55

[2] Heat exchanger unit................................................................ 56

[3]

Power Dispatching Extension Unit for the Transmission Lines

.. 57

6 Refrigerant Circuit ........................................................................ 58

[1] Refrigerant Circuit Diagram .................................................... 58

[2] Functions of Principal Parts.................................................... 59

7 Control.......................................................................................... 62

[1] Dip Switch Functions and Their Factory Settings .................. 62

[2] Controlling the Outdoor Unit .................................................. 68

[3] Operation Flow Chart ............................................................ 75

8 Test Run ...................................................................................... 80

[1] Check Items before Test Run.................................................. 80

[2] Test Run Method .................................................................... 80

[3] Operating Characteristics and Refrigerant Amount................ 81

[4] Adjustment and Judgment of Refrigerant Amount ................ 81

[5] Refrigerant Volume Adjustment Mode Operation .................. 83

[6] Symptoms that do not Signify Problems ................................ 85

[7]

Standard Operation Data (Reference Data)

.............................. 86

9 Troubleshooting............................................................................ 88

[1] Check Code List .................................................................... 88

[2] Responding to Error Display on the Remote Controller ........ 91

[3] Investigation of Transmission Wave Shape/Noise .................. 124

[4] Troubleshooting of Principal Parts .......................................... 127

[5] Refrigerant Leak .................................................................... 143

[6] Compressor Replacement Instructions .................................. 145

[7] Collecting the Cooling Liquid from the Accumulator .............. 146

0 LED display .................................................................................. 147

[1] LED Monitor Display .............................................................. 147

Safety Precautions

Symbols used in the text

Warning:

Failure to follow all instructions may result in serious personal injury or death.

Caution:

Failure to follow all instructions may result in personal injury or damage to the unit.

Symbols used in the illustrations

: Indicates an action that must be avoided.

: Indicates that important instructions must be followed.

: Indicates a part which must be grounded.

: Beware of electric shock (This symbol is displayed on the main unit label.) <Color : Yellow>

Warning : Carefully read the labels affixed to the main unit.

Before installing the unit, be sure to carefully read all of the following safety precautions.

These precautions provide important information regarding safety. Be sure to follow them to ensure safety.

After reading this handbook, hand it over to those who will be using the unit.
The user of the unit should keep this manual at hand and make it available to those who will be performing
repairs or relocating the unit.
Also, make it available to the new user when the user changes hands.

Be sure to carefully follow each step in this
handbook when installing the unit.

• Improper installation may result in water leak,

electric shock, smoke or fire.

Securely attach the terminal cover (panel) on the
unit.

• If installed improperly, dust and/or water may enter

the unit and present a risk of electric shock, smoke,
or fire.

Only use Refrigerant R410A as indicated on the
unit when installing or relocating the unit.

• The use of any other refrigerant or an introduction of

air into the unit circuit may cause the unit to run an
abnormal cycle and cause the unit to burst.

Do not make any changes or modifications to the
unit. In case of problems, consult the dealer.

• If repairs are not made properly, the unit may leak

water and present a risk of electric shock, or it may
produce smoke or cause fire.

Have all electrical work performed by a licensed
electrician according to the local regulations and
the instructions given in this manual. Secure a
circuit designated exclusively to the unit.

• Improper installation or a lack of circuit capacity may

cause the unit to malfunction or present a risk of
electric shock, smoke, and fire.

Have the unit professionally installed.

• Improper installation by an unqualified person may

result in water leak, electric shock, or fire.

Only use specified cables for wiring. Securely
connect each cable, and make sure that the cables
are not straining the terminals.

• Cables not connected securely and properly may

generate heat and cause fire.

Place the unit on a stable, level surface that
withstands the weight of the unit to prevent the
unit from tipping over or falling causing injury as a
result.

Take necessary safety measures against typhoons
and earthquakes to prevent the unit from falling
over.

- 1 -

When relocating the air conditioner, consult the
dealer or a specialist.

• Improper installation may result in water leak,

electric shock, or fire.

• Consult the dealer for necessary measures to take.

After completing the service work, check for a
refrigerant gas leak.

• If leaked gas refrigerant is exposed to a heart

source such as fan heater, stove, and electric grill,
noxious gases may form.

In the event of a refrigerant gas leak, provide
adequate ventilation to the room.

• If leaked refrigerant gas is exposed to a heat source,

noxious gases may form.

With All-Fresh type air conditioners, outdoor air
may be directly blown into the room upon thermo
off. Take this into consideration when installing the
unit.

• Direct exposure to outdoor air may present a health

hazard, and it may also cause food items to
deteriorate.

When installing the unit in a small room, safeguard
against hypoxia that results from leaked refrigerant
reaching the threshold level.

Do not touch the fins on the heat exchanger with
bare hands: they are sharp and dangerous.

Precautions for Handling Units for Use with R410A

Caution

Warning : Carefully read the labels affixed to the main unit.

Do not try to defeat the safety features of the
devices, and do not change the settings.

• Defeating the safety features on the unit such as the

pressure switch and temperature switch or using
parts other than those specified by Mitsubishi
Electric may result in fire or explosion.

Use refrigerant pipes made of C1220 phosphorus
deoxidized copper categorized under H3000
(Copper and Copper Alloy Seamless Pipes and
Tubes), a standard set by JIS. Keep the inner and
outer surfaces of the pipes clean and free of
contaminants such as sulfur, oxides, dust/dirt,
shaving particles, oils, and moisture.

• Contaminants inside the refrigerant piping will cause

the refrigerant oil to deteriorate.

Do not use the following tools that have been used
with the conventional refrigerants.Prepare tools
that are for exclusive use with R410A.
(Gauge manifold, charging hose, gas leak detector,
reverse-flow check valve, refrigerant charge base,
vacuum gauge, and refrigerant recovery
equipment.)

• If refrigerant and /or refrigerant oil left on these tools

are mixed in with R410A, or if water is mixed with
R410A, it will cause the refrigerant to deteriorate.

• Since R410A does not contain chlorine, gas-leak

detectors for conventional refrigerators will not work.

Only use specified parts.

• Have the unit professionally installed.

Improper installation may cause water leak, electric
shock, smoke, or fire.

Use a vacuum pump with a reverse-flow-check
valve.

• If other types of valves are used, the vacuum pump

oil will flow back into the refrigerant cycle and cause
the refrigerator oil to deteriorate.

Do not use the existing refrigerant piping

• The old refrigerant and refrigerator oil in the existing

piping contain a large amount of chlorine, which will
cause the refrigerator oil in the new unit to
deteriorate.

• R410A is a high-pressure refrigerant, and the use of

the existing piping may result in bursting.

- 2 -

Before Installing the Unit

Warning

Caution

Store the piping to be used during installation
indoors, and keep both ends of the piping sealed
until immediately before brazing. (Keep elbows and
other joints wrapped in plastic.)

• If dust, dirt, or water enters the refrigerant cycle, it

may cause the oil in the unit to deteriorate or may
cause the compressor to malfunction.

Use a small amount of ester oil, ether oil, or
alkylbenzene to coat flares and flange connections.

• A large amount of mineral oil will cause the

refrigerating machine oil to deteriorate.

Do not use a charging cylinder.

• The use of charging cylinder will change the

composition of the refrigerant and lead to power
loss.

Exercise special care when handling the tools.

• An introduction of foreign objects such as dust, dirt,

or water into the refrigerant cycle will cause the
refrigerating machine oil to deteriorate.

Only use R410A refrigerant.

• The use of refrigerants containing chlorine (i.e. R22)

will cause the refrigerant to deteriorate.

Use liquid refrigerant to charge the system.

• Charging the unit with gas refrigerant will cause the

refrigerant in the cylinder to change its composition
and will lead to a drop in performance.

Do not install the unit in a place where there is a
possibility of flammable gas leak.

• Leaked gas accumulated around the unit may start a

fire.

Do not use the unit to preserve food, animals,
plants, artifacts, or for other special purposes.

• The unit is not designed to provide adequate

conditions to preserve the quality of these items.

When installing the unit in a hospital, take
necessary measures against noise.

• High-frequency medical equipment may interfere

with the normal operation of the air conditioning unit
or the air conditioning unit may interfere with the
normal operation of the medical equipment.

Do not use the unit in an unusual environment.

• The use of the unit in the presence of a large

amount of oil, steam, acid, alkaline solvents, or
special types of sprays may lead to a remarkable
drop in performance and/or malfunction and
presents a risk of electric shock, smoke, or fire.

• The presence of organic solvents, corroded gas

(such as ammonia, sulfur compounds, and acid)
may cause gas or water leak.

Do not place the unit on or over things that may
not get wet.

• When humidity level exceeds 80% or when the

drainage system is clogged, indoor units may drip
water.

• Installation of a centralized drainage system for the

outdoor unit may also need to be considered to
prevent water drips from the outdoor units.

- 3 -

Before Installing (Relocating) the Unit or Performing Electric Work

Caution

Do not spray water on the air conditioners or
immerse the air conditioners in water.

• Water on the unit presents a risk of electric shock.

Install a breaker for current leakage at the power
source to avoid the risk of electric shock.

• Without a breaker for current leakage, there is a risk

of electric shock, smoke, or fire.

Use wires that are specified in the installation
manual.

• The use of other types of wires presents a risk of

electrical current leak, electric shock, smoke, or fire.

Periodically check the platform on which the unit is
placed for damage to prevent the unit from falling.

• If the unit is left on a damaged platform, it may

topple over, causing injury.

Ground the unit.

• Do not connect the grounding on the unit to gas

pipes, water pipes, lightning rods, or the grounding
terminals of telephones. Improper grounding
presents a risk of electric shock, smoke, fire, or the
noise caused by improper grounding may cause the
unit to malfunction.

Use breakers and fuses (electrical current breaker,
remote switch <switch + Type-B fuse>, molded
case circuit breaker) with a proper current
capacity.

• The use of large-capacity fuses, steel wire, or

copper wire may damage the unit or cause smoke or
fire.

When installing draining pipes, follow the
instructions in the manual, and make sure that they
properly drain water so as to avoid dew
condensation.

• If not installed properly, they may cause water leaks

and damage the furnishings.

Make sure the wires are not subject to tension.

• If the wires are too taut, they may break or generate

heat and/or smoke and cause fire.

Exercise caution when transporting products.

• Do not try to move equipments over 20kg (approx.
44 lbs.) alone.

• Do not use the PP bands used on some packages
for transportation.

• Wear protective gloves to avoid injury caused by
touching the fins on the heat exchanger with bare
hands.

• When using a suspension bolt to transport the heat­source unit, use a four-point suspension. A three­point suspension does not provide adequate stability
and presents a risk of accidents.

Properly dispose of the packing materials.

• Things such as nails and wood pieces may be
included in the package. Dispose of them properly to
prevent injury.

• Plastic bags present a choking hazard to children.
Tear up the plastic bags before disposing of them to
prevent accidents.

- 4 -

Before the Test Run

Caution

Turn on the unit at least 12 hours before the test
run.

• Keep the unit on throughout the season.
Turning the unit off during the season may cause
problems.

Do not turn off the power immediately after
stopping the unit.

• Allow for at least five minutes before turning off the
unit; otherwise, the unit may leak water or
experience other problems.

Do not operate the unit without panels and safety
guards in their proper places.

• They are there to keep the users from injury from
accidentally touching rotating, high-temperature, or
high-voltage parts.

Do not touch the refrigerant pipes with bare hands
during and immediately after operation.

• Depending on the state of the refrigerant in the
system, certain parts of the unit such as the pipes
and compressor may become very cold or hot and
may subject the person to frost bites or burning.

Do not operate switches with wet hands to avoid
electric shock.

Do not operate the unit without air filters.

• Dust particles in the air may clog the system and
cause malfunction.

- 5 -

- 6 -

¡¡

Read Before Servicing

[1] Items to Be Checked

1. Verify the type of refrigerant used by the unit to be serviced.

Refrigerant Type : R410A

2. Check the symptom exhibited by the unit to be serviced.

Look in this service handbook for symptoms relating to the refrigerant cycle.

3. Be sure to carefully read the Safety Precautions at the beginning of this document.

4. Prepare necessary tools: Prepare tools exclusive for use with each refrigerant type.

Refer to P7 for more information.

5. If the refrigerant circuit is opened (to repair a gas leak etc.), the dryer needs to be replaced.

Only use the dryer designed specifically for Citi Multi YGM-A. The use of other dryers may result in malfunctions.
✻ Replace the dryer after completing all the repairs on the refrigerant circuit.

(If left exposed to air, the dryer will absorb moisture. Replace the dryer as quickly as possible after removing
the old one.)

✻ When all of the following conditions are met, the replacement of drier is not necessary.

(1) Do not leave the refrigerant circuit longer than 2 hours.
(2) Cover the opening end with a cap or tape to keep moisture from entering.
(3) Also cover the opening end of the new part with a cap or tape
(4) Do not perform the task in the rain.
(5) Evacuate the refrigerant circuit as specified.

6. Verification of the connecting pipes: Verify the type of refrigerant used for the unit to be
moved or replaced.

• Use pipes made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the pipes clean and

free of contaminants such as sulfur, oxides, dust/dirt, shaving particles, oils, and moisture.

• Contaminants inside the refrigerant piping will cause the refrigerant oil to deteriorate.

7. If there is a gas leak or if the remaining refrigerant is exposed to an open flame, a noxious gas
hydrofluoric acid may form. Keep workplace well ventilated.

CAUTION

1. Install new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.

2. Chloride in some types of refrigerants such as R22 will cause the refrigerating machine oil to
deteriorate.

- 7 -

[2] Necessary Tools and Materials

Prepare the following tools and materials necessary for installing and servicing the unit.

[Necessary tools for use with R410A (Adaptability of tools that are for use with R22 and R407C)]

1. To be used exclusively with R410A (not to be used if used with R22 or R407C)

Tools/Materials NotesUse

Gauge Manifold
Charging Hose
Refrigerant Recovery Equipment
Refrigerant Cylinder

Refrigerant Cylinder Charging Port
Flare Nut

Evacuating, refrigerant charging
Evacuating, refrigerant charging
Refrigerant recovery
Refrigerant charging

Refrigerant charging
Connecting the unit to piping

5.09MPa on the High-pressure side.
Hose diameter larger than the conventional ones.

Write down the refrigerant type.
Pink in color at the top of the cylinder.
Hose diameter larger than the conventional ones.
Use Type-2 Flare nuts.
(That are in compliance with JIS B 8607).

2. Tools and materials that may be used with R410A with some restrictions

Tools/Materials NotesUse

Gas leak detector
Vacuum Pump

Flare Tool

Refrigerant Recovery Equipment

Detection of gas leaks
Vacuum drying

Flare machining of piping

Recovery of refrigerant

The ones for HFC type refrigerant may be used.
May be used if a reverse flow check adaptor is
attached.
Changes have been made in the flare machining
dimension. Refer to the next page.
May be used if designed for use with R410A.

3. Tools and materials that are used with R22 or R407C that can also be used with R410A

Tools/Materials NotesUse

Vacuum Pump with a Check valve
Bender
Torque Wrench

Pipe Cutter
Welder and Nitrogen Cylinder
Refrigerant Charging Meter
Vacuum Gauze

Vacuum drying
Bending pipes
Tightening flare nuts

Cutting pipes
Welding pipes
Refrigerant charging
Checking vacuum degree

Only ø 12.70 (1/2”) and ø 15.88 (5/8”) have a
larger flare machining dimension.

4. Tools and materials that must not be used with R410A

Tools/Materials NotesUse

Charging Cylinder Refrigerant Charging Must not be used with R410A-type units.

Tools for R410A must be handled with special care; keep moisture and dust from entering the
cycle.

Type-O pipes Soft copper pipes (annealed copper pipes)

They can be bent easily with hands.

Type-1/2H pipes Hard copper pipes (straight pipes)

Stronger than type-O pipes of the same radial thickness.

- 8 -

[3] Piping Materials

NOOK

New Piping Existing Piping

Do not use the existing piping!

<Types of copper pipe>

• The distinction between type-O and type-1/2H pipes is made based on the strength of the pipes themselves.

• Type-O pipes are soft and can easily be bent with hands.

• Type-1/2H pipes are considerably stronger than type-O pipes of the same radial thickness.

Use pipes made of phosphorus deoxidized copper.
Since the operation pressure of the units that use R410A is higher than that of the units for use with R22, use
pipes with at least the radial thickness specified in the chart below.
(Pipes with a radial thickness of 0.7 mm or less may not be used.)

Maximum Operation Pressure Applicable Refrigerants

3.45 MPa

4.30 MPa

R22, R407C etc.
R410A

<Types of Copper Pipes (Reference)>

✻ Use pipes that meet the local standards.

Type-O pipes

Type-1/2H or

H pipes

Size(mm) Size(inch) Radial Thickness(mm) Type

ø 6.35
ø 9.52

ø 12.7
ø 15.88
ø 19.05

ø 22.2

ø 25.4
ø 28.58
ø 31.75
ø 34.93

1/4”
3/8”
1/2”
5/8”
3/4”
7/8”

1”
1 1/8”
1 1/4”
1 3/8”

0.8t

0.8t

0.8t

1.0t

1.0t

1.0t

1.0t

1.0t

1.1t

1.2t

<Piping Materials/Radial Thickness>

✻ Although it was possible to use type-O for pipes with a size of up to ø19.05 (3/4”) with conventional refriger-

ants, use type-1/2H pipes for units that use R410A. (Type-O pipes may be used if the pipe size is

ø19.05 and

the radial thickness is 1.2t.)

✻ The table shows the standards in Japan. Using this table as a reference, choose pipes that meet the local

standards.

- 9 -

“Radial thickness” and “Refrigerant Types” are indicated on the insulation material on the piping materials for the
new refrigerant.

Indication of the radial thickness (mm) Indication of the refrigerant type

Radial thickness Symbols

0.8

1.0

08
10

Refrigerant type Symbol
Type1 R22, R407C
Type2 R410A

1
2

<Example of the symbols indicated on the insulation material>

The type of piping materials can also be found on the package.
<Example of a label found on the package>

~08-2~

Appears every 1 m

2 : common to type 1 and type 2
Refrigerant Type : R22,R407C,R410A
Bore diameter and radial thickness of the copper piping : 9.52✕0.8, 15.88✕1.0

<Indication of the radial thickness and refrigerant type on the piping materials>

The flare machining dimensions for units that use R410A is larger than those for units that use R22 in order to
increase air tightness.

If a clutch type flare tool is used to machine flares on units that use R410A, make the protruding part of the
pipe between 1.0 and 1.5mm. Copper pipe gauge for adjusting the length of pipe protrusion is useful.

Flare Machining Dimension(mm)

External dimension
of pipes

Size

Dimension A

R410A

ø 6.35
ø 9.52

ø 12.7
ø 15.88
ø 19.05

1/4”
3/8”
1/2”
5/8”
3/4”

9.1

13.2

16.6

19.7

24.0

R22

9.0

13.0

16.2

19.4

23.3

Dimension A

<Flare Machining (type-O and OL only)>

Type-2 flare nuts instead of type-1 s are used to increase the strength. The size of some of the flare nuts have
also been changed.

Flare nut dimension(mm)

External dimension
of pipes

Size

Dimension B

R410A(Type2)

ø 6.35

ø 9.52

ø 12.7
ø 15.88
ø 19.05

1/4”
3/8”
1/2”
5/8”
3/4”

17.0

22.0

26.0

29.0

36.0

R22(Type1)

17.0

22.0

24.0

27.0

36.0

Dimension B

<Flare Nut>

✻ The table shows the standards in Japan. Using this table as a reference, choose pipes that meet the local

standards.

Store the pipes to be used indoors. (Warehouse at site or owner’s warehouse)
Storing them outdoors may cause dirt, waste, or water to infiltrate.

Both ends of the pipes should be sealed until immediately before brazing.
Wrap elbows and T’s in plastic bags for storage.

✻

The new refrigerator oil is 10 times more hygroscopic than the conventional refrigerator oil (such as Suniso). Water
infiltration in the refrigerant circuit may deteriorate the oil or cause a compressor failure. Piping materials must be
stored with more care than with the conventional refrigerant pipes.

OK

OK

NO

NO

- 10 -

[4] Storage of Piping Material

1. Storage location

2. Pipe sealing before storage

Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections.

Reason :

1. The refrigerator oil used for the equipment is highly hygroscopic and may introduce water inside.

Notes :

• Introducing a great quantity of mineral oil into the refrigerant circuit may also cause a compressor failure.

• Do not use oils other than ester oil, ether oil or alkylbenzene.

- 11 -

[5] Piping Machining

No changes from the conventional method, but special care is required so that foreign matter (ie. oxide scale, water, dirt,
etc.) does not enter the refrigerant circuit.

Example : Inner state of brazed section

When non-oxide brazing was not used When non-oxide brazing was used

Items to be strictly observed :

1. Do not conduct refrigerant piping work outdoors on a rainy day.

2. Apply non-oxide brazing.

3. Use a brazing material (BCuP-3) which requires no flux when brazing between copper pipes or between a copper pipe
and copper coupling.

4. If installed refrigerant pipes are not immediately connected to the equipment, then braze and seal both ends of them.

Reasons :

1. The new refrigerant oil is 10 times more hygroscopic than the conventional oil. The probability of a machine failure if
water infiltrates is higher than with conventional refrigerant oil.

2. A flux generally contains chlorine. A residual flux in the refrigerant circuit may generate sludge.

Note :

• Commercially available antioxidants may have adverse effects on the equipment due to its residue, etc. When
applying non-oxide brazing, use nitrogen.

- 12 -

[6] Brazing

No changes from the conventional method. Note that a refrigerant leakage detector for R22 or R407C cannot detect
R410A leakage.

Halide torch R22 or R407C leakage detector

Items to be strictly observed :

1. Pressurize the equipment with nitrogen up to the design pressure and then judge the equipment’s airtightness, taking
temperature variations into account.

2. When investigating leakage locations using a refrigerant, be sure to use R410A.

3. Ensure that R410A is in a liquid state when charging.

Reasons :

1. Use of oxygen as the pressurized gas may cause an explosion.

2. Charging with R410A gas will lead the composition of the remaining refrigerant in the cylinder to change and this
refrigerant can then not be used.

Note :

• A leakage detector for R410A is sold commercially and it should be purchased.

1. Vacuum pump with check valve
A vacuum pump with a check valve is required to prevent the vacuum pump oil from flowing back into the refrigerant
circuit when the vacuum pump power is turned off (power failure).
It is also possible to attach a check valve to the actual vacuum pump afterwards.

2. Standard degree of vacuum for the vacuum pump
Use a pump which reaches 65Pa or below after 5 minutes of operation.
In addition, be sure to use a vacuum pump that has been properly maintained and oiled using the specified oil. If the
vacuum pump is not properly maintained, the degree of vacuum may be too low.

3. Required accuracy of the vacuum gauge
Use a vacuum gauge that can measure up to 650Pa. Do not use a general gauge manifold since it cannot measure a
vacuum of 650Pa.

4. Evacuating time

• Evacuate the equipment for 1 hour after 650Pa has been reached.

• After envacuating, leave the equipment for 1 hour and make sure the that vacuum is not lost.

5. Operating procedure when the vacuum pump is stopped
In order to prevent a backflow of the vacuum pump oil, open the relief valve on the vacuum pump side or loosen the
charge hose to drawn in air before stopping operation.
The same operating procedure should be used when using a vacuum pump with a check valve.

NO

NO

- 13 -

[7] Airtightness Test

[8] Vacuuming

Recommended vacuum gauge : ROBINAIR 14010 Thermistor Vacuum Gauge

1. Vacuum pump with reverse-flow check valve (Photo 1)

To prevent vacuum pump oil from flowing back into the refrigerant circuit upon turning off the vacuum pump’s power

source, use a vacuum pump equipped with a reverse flow check valve.

A check valve may also be added to the vacuum pump currently in use.

2. Standard of vacuum degree (Photos 1 and 2)

Use a vacuum pump that shows a vacuum degree of 65Pa or less after 5 minutes of operation. Use a pump well-

maintained with an appropriate lubricant.

3. Required precision of vacuum gauge

Use a vacuum gauge that registers a vacuum degree of 650Pa and measures at intervals of 130Pa. (A recommended

vacuum gauge is shown in Photo 2.)

Do not use a vacuum gauge that does not register a vacuum degree of 650Pa.

4. Evacuation time

• After the vacuum gauge has registered the vacuum degree of 650Pa, evacuate for 1 hour. (A thorough vacuum drying

removes moisture in the pipes.)

• Verify that the vacuum degree has not risen by more than 130Pa 1 hour after evacuation. A rise by less than 130Pa is

acceptable.

• If it has exceeded by more than 130Pa, conduct vacuuming following the instructions in the “6. Special vacuum drying”

section.

5. Procedures for stopping vacuum pump

To prevent the reverse flow of vacuum pump oil, open the relief valve on the vacuum pump side, or draw in air by

loosening the charge hose, and then stop the operation.

The same procedures should be followed when stopping a vacuum pump with a reverse-flow check valve.

6. Special vacuum drying

• When 650Pa or lower degree of vacuum cannot be attained after 3 hours of evacuation, it is likely that water has

penetrated the system or that there is a leak. When water infiltration is suspected, vacuum with nitrogen gas.

After breaking the vacuum, pressurize the system with nitrogen gas to a degree of 0.05MPa, and conduct an evacuation

again. Repeat it until 650Pa or lower degree of vacuum is attained or the vacuum pressure rise will be lost.

• Only use nitrogen gas for vacuum breaking. (Use of oxygen may cause an explosion.)

Photo 1 15010H Photo 2 14010

- 14 -

[9] Vacuum Drying

R410A must be in a liquid state when charging.

For a cylinder with a syphon attached For a cylinder without a syphon attached

Cylinder color identification R407C-Gray Charged with liquid refrigerant

R410A-Pink

Reasons :

1.

Note :

• In the case of a cylinder with a syphon, liquid R410A is charged without turning the cylinder up side down. Check the
type of cylinder before charging.

Cylin-

der

Cylin-

der

Valve

Val ve

Liquid

Liquid

R410A is a pseudo-azeotropic refrigerant (boiling point R32 = -52˚C, R125 = -49˚C) and can roughly be handled
in the same way as R22; however, be sure to fill the refrigerant from the liquid side, for doing so from the gas
side will somewhat change the composition of the refrigerant in the cylinder.

When refrigerant leaks, additional refrigerant may be charged. (Add the refrigerant from the liquid side.)
✻Refer to 9-[5].

- 15 -

[10] Changing Refrigerant

[11] Remedies to be taken in case of a refrigerant leak

Composition (wt%)
Type of refrigerant

Chloride
Safety Class
Molecular Weight
Boiling Point
Steam Pressure (25

˚C,MPa)(gauge)

Saturated Steam Density (25

˚C,kg/m3)
Flammability
Ozone Depletion Coefficient (ODP)✻1
Global Warming Coefficient (GWP)✻2
Refrigerant charging method
Addition of refrigerant in case of a leak

R410A

R32/R125

(50/50)

Simulated azeotropic

refrigerant

Not contained

A1/A1

72.6

-51.4

1.557

64.0

Non-flammable

0

1730

Liquid charging

Possible

R407C

R32/R125/R134a

(23/25/52)

Non-azeotropic

refrigerant

Not contained

A1/A1

86.2

-43.6

0.9177

42.5

Non-flammable

0

1530

Liquid charging

Possible

New Refrigerant

(HFC system)

Conventional Refrigerant

(HCFC system)

R22
R22

(100)

Single refrigerant

Contained

A1

86.5

-40.8

0.94

44.4

Non-flammable

0.055
1700

Gas charging

Possible

✻1: When CFC11 is used as a reference ✻2: When CO

2 is used as a reference

- 16 -

[12] Characteristics of the Conventional and the New Refrigerants

1. Chemical property

As with R22, the new refrigerant (R410A) is low in toxicity and a chemically stable non-flammable refrigerant.
However, because the specific gravity of steam is greater than that of air, leaked refrigerant in a closed room will
accumulate at the bottom of the room and may cause hypoxia. Also, leaked refrigerant exposed directly to an
open flame will generate noxious gasses. Use the unit in a well-ventilated room.

R410A

MPa

0.30

0.70

1.34

2.31

3.73

4.17

-20
0
20
40
60
65

R407C

MPa

0.18

0.47

0.94

1.44

2.44

2.75

R22

MPa

0.14

0.40

0.81

1.44

2.33

2.60

Pressure (gauge)

Temperature (

˚C)

3. Pressure Characteristics

The pressure in the units that use R410A is 1.6 times as great as that in the units that use R22.

2. Refrigerant Composition

Because R410A is a simulated azeotropic refrigerant, it can be handled in almost the same manner as a single
refrigerant such as R22. However, if the refrigerant is removed in the vapor phase, the composition of the refriger
ant in the cylinder will somewhat change.
Remove the refrigerant in the liquid phase. Additional refrigerant may be added in case of a refrigerant leak.

- 17 -

Refrigerant Refrigerating machine oil

R22
R407C
R410A

Mineral oil

Ester oil
Ester oil

[13] Notes on Refrigerating Machine Oil

1. Refrigerating Machine Oil in the HFC Refrigerant System

HFC type refrigerants use a refrigerating machine oil different from that used in the R22 refrigerant system.
Please note that the ester oil sealed in the unit is not the same as commercially available ester oil.

Cause Symptom

Clogged expansion valve and capillary
Poor cooling performance
Compressor overheat
Poor motor insulation
Motor burning
Coppering of the orbiting part
Locking
Burning in the orbiting part

Expansion valve/capillary
Poor cooling performance
Drier clogging
Compressor overheat

Burning in the orbiting part
Expansion valve and capillary clogging
Poor cooling performance
Compressor overheat
Burning in the orbiting part

Effects on the refrigeration cycle

Sludge formation
Generation of acid
Oxidization
Oil degradation

Water infiltration

Air infiltration

Infiltration

of

contaminants

Dust, dirt

Mineral oil
etc.

Expansion valve and capillary freeze

Hydrolysis

Oxidization

Adhesion to expansion valve and capillary

Infiltration of contaminants into the compressor

Sludge formation and adhesion

Oil degradation

2. Effects of the ✻Contaminants in the System

Refrigerating machine oil used in the HFC system must be handled more carefully than conventional mineral oils.
The table below shows the effects of air, moisture, and contaminants in the refrigerating machine oil on the refrig­eration cycle.

✻ “ Contaminants ” is defined as moisture, air, process oil, dust/dirt, the wrong types of refrigerant and refrigerat-

ing machine oil.

<The Effects of Air, Moisture, and Contaminants in the Refrigerating Machine Oil on the Refrigeration Cycle.>

OK NO

➀ Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring

regulations, and guidance of each electric power company.

➁ Wiring for control (hereinafter referred to as transmission line) shall be (5cm or more) apart from power source wiring so

that it is not influenced by electric noise from power source wiring. (Do not insert transmission line and power source wire
in the same conduit.)

➂ Be sure to provide designated grounding work to outdoor unit.
➃ Give some allowance to wiring for electrical part box of indoor and outdoor units, because the box is sometimes removed

at the time of service work.

➄ Never connect 380~415V(220~240V )power source to terminal block of transmission line.If connected,electrical parts

will be burnt out

➅ Use 2-core shield cable for transmission line. If transmission lines of different systems are wired with the same multiple-

core cable, the resultant poor transmitting and receiving will cause erroneous operations.

Outdoor

unit

Indoor unit

Remote

controller

2-core cable

2-core cable

Outdoor

unit

Remote

controller

Indoor unit

Multiple-

core cable

Type of cable

Cable diameter

Remarks

Sheathed 2-core cable (unshielded)
CVV

0.3

~ 1.25mm

2

(0.75 ~ 1.25mm2) ✻1

More than 1.25mm

2

Shielding wire (2-core)
CVVS or CPEVS

When 10m is exceeded, use cables with
the same specification as transmission cables.

0.3 ~ 1.25mm

2

(0.75 ~ 1.25mm2) ✻1

Max length : 200m

Transmission cables M-NET Remote controller cables MA Remote controller cables

CVVS : PVC insulated PVC jacketed shielded control cable
CPEVS : PE insulated PVC jacketed shielded communication cable
CVV : PV insulated PVC sheathed control cable

—

✻

1 Connected with simple remote controller.

- 18 -

™™

Restrictions

[1] Electrical Work & M-NET control

1. Attention

2. Types of control cable

00

00

101

Main

00

201

201

201

202

000

247

Address (1) setting varies depending on the system configuration. See “[3] Examples of system connection”
section for details.

Unit or controller Symbol

Address

Setting method

setting range

Indoor unit Main/sub units IC

Lossnay LC

M-NET
remote
controller

Main remote controller RC

Sub remote controller RC

MA remote controller MA

Outdoor unit OC

System
controller

Group remote controller GR, SC

System remote controller SR, SC

ON/OFF remote controller AN, SC

ST, SCSchedule timer (for M-NET)

Centralized controller TR, SC

(Note 5)

LM adapter SC

0, 01~50

(Note 1)

101~150

151~200

(Note 2)

0, 51~100

(Note 1, 3, 4)

52~100

(Note 3, 4)

201~250

201~250

201~250

201~250

0, 201~250

201~250

Notes:

Factory

setting

Type and method of switch setting

Switch setting vary depending on the system configuration. Make sure to read “[3] Examples of system connection”
before conducting electrical work. Turn off the power before setting the switch. Operating the switch while the unit is
being powered will not change the setting, and the unit will not properly function.

1. Address setting is not required for a single refrigerant system (with a few exception).

2. When setting M-NET remote controller address to “200,” make it “00.”

3. When setting the outdoor unit and outdoor auxiliary unit address to “100,” make it “50.”

4. When an address in a system overlapped with the outdoor unit or BC controller (Main) address of other refrigerant system,
choose an another address within theset range that is not in use (with a few exceptions).

5. When controlling the K-control units;
(1) A K-transmission converter (Model name: PAC-SC25KA) is required. To set the address for the K-transmission converter,

set it to thelowest address of the K-control unit to be controlled + 200.

(2) Set the address of the system controller (G-50A) to “0.” The K-control unit can only be controlled by the system controller

with theaddress “0.”

(3) To control both K-control unit and M-NET model unit, make the address of the K-control unit larger than that of the indoor

unit of M-NET model.
Group-register on the system controller so that the group No. and the lowest address of the K-controlled indoor units
belonging to thegroup will be identical.

Use the address that equals the sum of the smallest indoor
unit address in the same refrigerant system and 50.

Use the address that equals the sum of the smallest
address of the indoor unit out of all the indoor units
that are connected to the BC controller and 50.
When a sub BC controller is connected, the automatic
start up function will not be available.

Auxiliary
units

Hex. unit

BC controller (Sub)

OS

BC

BS

Use the address that equals the sum of the address of the
outdoor unit in the same refrigerant system and 1.

BC controller (Main)

Choose any number within the range of addresses shown left.
However when using with the upper SC setting, or wishing to
control the k-control units, set to “0.”

Assign the smallest address to the indoor unit to
become the main unit within the same group, and
then use sequential numbers to assign an address
to all the indoor units in the group. (Note 5)
If applicable, set the sub BC controllers in an R2
system in the following order:

(1)

Indoor unit to be connected to the main BC controller

(2)

Indoor unit to be connected to No.1 sub BC controller

(3)

Indoor unit to be connected to No.2 sub BC controller

Set the address so that (1) < (2) < (3)

Assign any unused address after setting all indoor units.

Set to the lowest address of the indoor main unit
within the same group + 150.

Set to the lowest No. of the group to be controlled + “200.”

Set to the lowest No. of the group desired tobe controlled + “200.”

Choose any number within the range of addresses shown left.

Choose any number within the range of ad-dresses shown left.

Choose any number within the range of addresses shown left.

Set to the lowest address of the indoor main unit
within the same group + 100.

No address setting required. (When operating with 2 remote controllers,
the main/sub selector switch must be set.

- 19 -

[2] Types of Switch Setting and Address Setting

1. Switch setting

2. Address setting

- 20 -

System
Configuration

Single refrigerant
system

___

_

Multiple refrigerant
system

Connection with
the system
controller

Power supply unit
for the
transmission lines

Unnecessary

Unnecessary (Note2)
(Supplied from the
outdoor unit)

Applicable

Grouping operation
of different
refrigerant systems

n/a

applicable

applicable // n/a

applicable // n/a

applicable // n/a

The setting of the power supply
selecting connector

Use CN41 as is (Factory setting)

Replace the CN41 with CN40 on
only one of the outdoor units.

✻

Connect the S terminal of the TB7
(terminal block on the outdoor
unit) on the outdoor unit whose

CN41 was replaced with CN40 to
the earth terminal of the electric
box.

Use CN41 as is (Factory setting)

n/a

Connected with the
indoor units

Connected with the
centralized system

Notes:

1. Will limit the total connectable units in the refrigerant system.

2. The need for a power supply unit for the transmission lines depends on the system configuration. Refer to “ DATA BOOK ” for
more details.

Setting the power supply selecting connector for the outdoor unit (Factory setting: CN41 is connected.)(2)

System configuration Setting of the centralized controller switch (SW 2-1)

Connection system with the system controller n/a Leave it to OFF. (Factory setting)

Connection system with the system controller applicable (Note 1) ON

Note:

1. When connecting only the LM adapter, leave SW2-1 to OFF.

Note:

1.

Refer to section “ 7 [2] 12. Demand control ” for detailed information on demand control settings.

Setting the centralized control switch on the outdoor unit (factory setting: SW2-1 OFF )(3)

Category

Output

Input

Usage

Cooling operation is disabled (thermo OFF) by the external
input to the outdoor units.

✻ Can be used as an on-demand control for each refrigerant

system.

Quiet operation of outdoor units is run with an external input to
the outdoor units.
(Night mode can be run under the following conditions: Outdoor
air temperature below 30

˚C when running a cooling operation

and above 3˚C when running a heating operation.)

Forces the outdoor units to run a fan operation by receiving the
snow signal from the snow sensor.
The operation mode can be switched between cooling and
heating with an external input to the outdoor units.

Outdoor units’ signal output

✻ Can be used as a device that displays the operation status
✻ Can run an interlocking control operation with external devices

Function

Demand (level)

Night mode or Demand
(Level) ✻

Note1

Snow sensor
Signal input (level)

You can switch the operation mode between cooling and
heating by input from the outside to the outdoor unit.

Auto-changeover

Compressor in operation

Abnormal operation status

CN3S

CN3N

CN3D

CN51

Terminal to be used

Various types of control using the connectors on the outdoor unit for input-output signal
(various types of connections with optional parts)

(4)

IC

TB5 TB

15

12

00

IC

TB5 TB

15

12

00

A1 B2

MA

A1 B2

MARC

TB5

00

IC

TB5

12

TB

15

IC

TB5 TB

15

12

0000

IC

TB5 TB

15

12

00

A1 B2

MA

A1 B2

MA

A1 B2

MA

MA

m1

L11

m2

L3 L4

L12 L13

m3

m5

m4

NO

NO

L2

A1 B2

A1 B2

a. Indoor/outdoor transmission line

Farthest length (1.25mm2 or more)

L2 + L3 + L4 200m

L2 + L11 + L12 + L13 200m

b. Centralized control transmission line

No connection is required.

c. MA remote controller wiring

Total length (0.3 ~ 1.25mm2)

m1 200m

m2 + m3 200m

m4 + m5 200m

Note 1. For the connection to the terminal block of compact

remote controller, employ wire with a diameter of 0.75

~ 1.25mm

2

Control wiring example

Group

Prohibited items Allowable length

1. M-NET and MA remote controllers can not be connected to-

gether to the indoor unit within the same group.

2. MA remote controller of 3 units or more can not be connected

to the indoor unit within the same group.

3. When the total number of indoor units exceeds 26 units In-

cluding that above Type 200, a transmission booster is re-

quired.

4. In the case when start/stop input (CN32, CN51, CN41) is used

by indoor group operation, the “Automatic address set-up”

can not be employed. Please refer to 1. (2) “ Manual address

set-up.”

5. For the connection of LOSSNAY with more than 2 units in a

single refrigerant system, refer to the following “Connection

of 2 LOSSNAY units in refrigerant system.”

Interlocking with ventilation

– Example to use shielded wire –

Group

Group

Group

LC

≤

≤

≤

≤

≤

S

M1M2

S

M1M2

S

M1M2

S

M1M2

S

M1M2

S

M1M2

OC

TB3

TB7

00

OS

TB3

S

(00)

S

M1M2 M1M2M1M2

- 21 -

[3] Examples of system connection

1. System using MA remote controller

(1) In the case of single refrigerant system (Automatic address set-up)

Wiring method • Address setting method

a. Indoor/outdoor transmission line

Apply jumper wiring connection between M1, M2 terminals of the indoor/outdoor transmission line terminal block

(TB3) on the outdoor unit (OC) and that of indoor/outdoor transmission line terminal block (TB5) on each indoor

unit (IC). (with non-polarity two wires)

❉ When the transmission line is long or noise sources are located near the unit, recommend to use shielded wire.

Connection of shielded wire:

For the earth of shielded wire, apply jumper wiring connection between the earth screw of OC and the S-terminal of

IC terminal block (TB5).

b. Centralized control transmission line

Connection is not required.

c. MA remote controller wiring

Connect the 1, 2 terminals of MA remote controller wiring terminal block (TB15) on IC to the terminal block of MA

remote controller (MA). (with non-polarity two wires)

❉ MA remote controller can be connected to A-type indoor unit or later.

For 2-remote controller operation:

To employ 2-remote controller operation, connect 1, 2 terminals of the terminal block (TB15) on IC to the terminal

block of two MA remote controllers.

❉ Set the main/sub selector switch of one MA remote controller to the sub remote controller. (For the setting method,

see the installation manual of MA remote controller.)

For indoor group operation:

For the group operation of IC, connect 1, 2 terminals of the terminal block (TB15) on all ICs within the same group,

and connect 1, 2 terminals of the terminal block (TB15) on another IC to the terminals of MA remote controller.

(with non-polarity two wires)

❉ To operate the indoor units with different function in the same group, refer to 1. (2).

d. LOSSNAY connection

Apply jumper wiring to connect M1, M2 terminals of the terminal block (TB5) on IC to the indoor/outdoor

transmission terminal block (TB5) on LOSSNAY (LC). (with non-polarity two wires)

❉ Linked and registered automatically with all indoor units within a refrigerant system.

❉ Please refer to the 1. (2) “Manual address set-up,” when interlocking partial indoor units with Lossnay, using

Lossnay alone without interlocking, interlocking indoor units and Lossnay for over 16 units within a refrigerant

system, or connecting LOSSNAY for over 2 units in a refrigerant system.

e. Switch setting

Address setting is not required.

Order

Unit or controller

Address

Setting method Caution

Factory

setting range

setting

Main unit IC

Not required – 00

1 Indoor unit

Sub unit IC

2 LOSSNAY LC Not required –

3

MA remote

Main uni

Hex. unit

t MA Not required –

Main

controller

Sub unit

Comp. unit

MA Sub unit

4 Outdoor unit OC

Not required –

5 Sub unit OS

• Refer to 1. (2) to operate indoor units
with different function in the same
group.

Set with main/sub
selector switch.

00

00

- 22 -

L2

IC

TB5 TB

15

12

01

IC

TB5 TB

15

12

02

A1 B2

MA

A1 B2

MA

TB5

05

IC

TB5

12

TB

15

IC

TB5 TB

15

12

0403

TB5

06

A1 B2

MA

L11

L3 L4

L12 L13

a. Indoor/outdoor transmission line

The same as 1. (1)

b. Centralized control transmission line

No connection is required.

c. MA remote controller wiring

The same as 1. (1)

Control wiring example

Group

Prohibited items Allowable length

1. M-NET and MA remote controllers can not be connected to-

gether to the indoor unit within the same group.

2. MA remote controller of 3 units or more can not be connected

to the indoor unit within the same group.

3. When the total number of indoor units exceeds 26 units in-

cluding that above Type 200, a transmission booster is re-

quired.

Interlocking with ventilation

– Example to use shielded wire –

Group

Group

LC

LC

S

M1M2

S

M1M2

S

M1M2

S

M1M2

S

M1M2

S

M1M2

S

M1M2

OC

TB3

TB7

51

OS

(52)

TB3

S

M1M2 M1M2

- 23 -

1. System using MA remote controller

(2) In the case of single refrigerant system connecting 2 or more LOSSNAY units (Manual address set-up)

- 24 -

1 Indoor unit

2 LOSSNAY

3

MA remote
controller

4 Outdoor unit

Main unit

Sub unit

Main uni

t

Sub uni

Comp. unit

Hex. unit

t

IC

LC

MA

MA

OC

01 ~ 50

01 ~ 50

Not required

Not required

51 ~ 100

Wiring method • Address setting method

a. Indoor/outdoor transmission line

The same as 1. (1)

Connection of shielded wire:

The same as 1. (1)

b. Centralized control transmission line

No connection is required.

c. MA remote controller wiring

The same as 1. (1)

For 2-remote controller operation:

The same as 1. (1)

For indoor group operation:

The same as 1. (1)

d. LOSSNAY connection

Apply jumper wiring to connect M1, M2 terminals of the terminal block (TB5) on the indoor unit (IC) to the terminal

block (TB5) on Lossnay (LC). (with non-polarity two wires)

❉ The interlocking registration of the indoor unit and Lossnay from the remote controller is required. (For the regis-

tration method, see the installation manual of remote controllers.)

e. Switch setting

Address setting is required as listed below.

Order

Unit or controller

Address

Setting method Caution

Factory

setting range

setting

• Set the lowest address within
a same group to the indoor unit
desired to be the main unit.

Set to the main unit address
within a same group in serial or­der.

[Main unit +1, +2, +3, .... ]

Set any address after setting al

Set with main/sub selector
switch.

5 Sub unit OS Oundoor unit address + 1

l

indoor units.

–

00

00

Main

00

• When operating indoor
units with different function
within a same group, as­sign the indoor unit with the
most plenty of function to
the main unit.

• Set the address not to be
overlapped with the indoor
unit address.

• When setting address to
“100,” make it “50.”

The lowest address of indoor
unit within refrigerant system
+ 50

- 25 -

IC

TB5 TB

15

12

01

IC

TB5 TB

15

12

03

A1 B2

MA

A1 B2

MA

TB5

06

IC

TB5

12

TB

15

IC

TB5 TB

15

12 12

0402

IC

TB5 TB15

05

A1 B2

MA

L3 L4

L23L22 L24

NO

NO

L2

m2

m3

a. Indoor/outdoor transmission line

Farthest length (1.25mm

2

or more)
L2 + L3 + L4 200m
L22 + L23 + L24 200m

b. Centralized control transmission line

Farthest length via outdoor unit (1.25mm

2

or more)

L2 + L3 + L4 + L31 + L22 + L23 + L24 500m

c. MA remote controller wiring

The same as 1. (1)

Control wiring example

Group

Prohibited items Allowable length

1. M-NET and MA remote controllers can not be connected to­gether to the indoor unit within the same group.

2. MA remote controller of 3 units or more can not be connected
to the indoor unit within the same group.

3. Do not connect together the terminal blocks (TB5) of the in­door unit connected to different outdoor units.

4. Replacement of the power supply selecting connector (CN41)
on the outdoor unit should be done only on one outdoor unit.

5. Grounding of S-terminal of the centralized control terminal
block (TB7) on outdoor unit should be done only on one out­door unit.

6. When the total number of indoor units exceeds 26 units in­cluding that above Type 200, a transmission booster is re­quired.

Interlocking with ventilation

– Example to use shielded wire –

Group

Group

LC

≤

≤

≤

S

M1M2

S

M1M2

S

M1M2

S

M1M2

S

M1M2

S

M1M2

CN41→CN40

Replace

OC

TB3

TB7

51

OC

TB3

TB7

52

S

(54)

OS

S

(53)

L31

OS

TB3

Leave CN41
as it is.

TB3

Connect

S

M1M2 M1M2M1 M2

M1M2

S

M1M2 M1M2

1. System using MA remote controller

(3) In the case of different refrigerant grouping operation

- 26 -

Wiring method • Address setting method

a. Indoor/outdoor transmission line

Apply jumper wiring connection between M1, M2 terminals of the indoor/outdoor transmission line terminal block

(TB3) on the outdoor unit (OC) and that of indoor/outdoor transmission line terminal block (TB5) on each indoor

unit (IC). (with non-polarity two wires)

❉ Make sure to use shielded wire.

Connecting of shielded wire:

The same as 1. (1)

b. Centralized control transmission line

Apply jumper wiring between M1, M2 terminals of centralized control transmission line terminal blocks (TB7) on

each OC. For one OC only, replace the power selecting connector (CN41) with (CN40).

❉ Make sure to use shielded wire.

Connecting of shielded wire:

Apply jumper wiring to connect the shielded earth to S-terminal of the terminal block (TB7) on each OC. Connect

Sterminal of the terminal block (TB7) on the one OC with (CN40) replaced to the earth screw ( ) of the electrical

parts box.

c. MA remote controller wiring

The same as 1. (1)

For 2-remote controller operation:

The same as 1. (1)

For indoor unit group operation:

The same as 1. (2)

d. LOSSNAY connection

The same as 1. (2)

e. Switch setting

Address setting is required as follows.

1 Indoor unit

2 LOSSNAY

3

MA remote
controller

4 Outdoor unit

Main unit

Sub unit

Main unit

Sub unit

IC

LC

MA

MA

OC

01 ~ 50

01 ~ 50

Not required

Sub unit

51 ~ 100

• Set the address not to be
overlapped with the indoor
unit address.

• When setting address to
“100,” make it “50.”

Order

Unit or controller

Address

Setting method Caution

Factory

setting range

setting

• Set the lowest address within
a same group to the indoor unit
desired to be the main unit.

Set to the main unit address
within a same group in serial or­der.

[Main unit +1, +2, +3, .... ]

Set any address after setting all
indoor units.

–

Set by the main/sub selector
switch.

The lowest address of indoor
unit within refrigerant system
+ 50

00

00

Main

Hex. unit

Comp. unit

5 Sub unit OS Oundoor unit address + 1

00

- 27 -

IC

TB5 TB

15

12

01

IC

TB5 TB

15

12

02

A1 B2

MA

A1 B2

MA

TB5

05

IC

TB5

12

TB

15

IC

TB5 TB

15

12

0403

TB5

06

A1 B2

MA

L3 L4

L23 L24

NO

L2

L22

NO

a. Indoor/outdoor transmission line

The same as 1. (3)

b. Centralized control transmission line

Farthest length via outdoor unit (1.25mm2 or more)
L32 + L31 + L2 + L3 + L4 500m
L32 + L22 + L23 + L24 500m
L2 + L3 + L4 + L31 + L22 + L23 + L24 500m

c. MA remote controller wiring

The same as 1. (1)

Control wiring example

Group

Prohibited items Allowable length

1. M-NET and MA remote controllers can not be connected to­gether to the indoor unit within the same group.

2. MA remote controller of 3 units or more can not be connected
to the indoor unit within the same group.

3. Do not connect together the terminal blocks (TB5) of the in­door unit connected to different outdoor units.

6. When the total number of indoor units exceeds 26 units In­cluding that above Type 200, a transmission booster is re­quired.

Interlocking with ventilation

– Example to use shielded wire –

Group

Group

LC

LC

Notes:

1. Leave SW2-1 as “OFF” when connecting LM adapter only.

2. LM adapter requires the power source of 1-phase AC 230V

Note 1

.

≤

≤

≤

4. Replacement of the power supply selecting connector (CN41)
on the outdoor unit should be done only on one outdoor unit.

5. Grounding work is required for S-terminal of the centralized
control transmission block (TB7) on one outdoor unit onl

CN41→CN40 Replace
SW2-1 OFF→ON

y.

S

M1M2

S

M1M2

S

M1M2

S

M1M2

S

M1M2

S

M1M2

OC

TB3

TB7

51

OS

S

(52)

OC

TB3

TB7

53

(54)

System controller

S

L31

L32

Note 2

TB3

TB3

OS

S

M1M2 M1M2

S

S

M1M2 M1M2

M1M2

M1M2

M1M2

Connect

Note 1

Leave CN41 as it is.
SW2-1 OFF→ON

1. System using MA remote controller

(4) In the case of connecting system controller to centralized control transmission line

- 28 -

Wiring method • Address setting method

a. Indoor/outdoor transmission line

The same as 1. (3)

Connection of shielded wire:

The same as 1. (1)

c. MA remote controller wiring

The same as 1. (1)

For 2-remote controller operation:

The same as 1. (1)

For indoor group operation:

The same as 1. (1)

d. LOSSNAY connection

Apply jumper wiring to connect M1, M2 terminals of the terminal block (TB5) on (IC) to the terminal block (TB5)

on the indoor/outdoor transmission line terminal block (TB5) on Lossnay (LC). (with non-polarity two wires)

❉ The interlocking registration of the indoor unit and LOSSNAY from the system controller is required. (For the

registration method, see the installation manual of the system remote controllers.)

When connecting ON/OFF remote controller and LM adaptor only, the interlocking registration from the remote

controller is required.

e. Switch setting

Address setting is required as listed below.

1 Indoor unit

2 LOSSNAY

3

MA remote
controller

4 Outdoor unit

Main unit

Sub unit

Main unit

Sub unit

IC

LC

MA

MA

OC

01 ~ 50

01 ~ 50

Not required

Sub unit

• Set the address not to be
overlapped with the indoor
unit address.

• Conduct initial setting by the
system controller with the
same setting detail of indoor
unit applied in MA remote
controller wiring.

• When setting address to
“100,” make it “50.”

Order

Unit or controller

Address

Setting method Caution

Factory

setting range

setting

• Set the lowest address within
a same group to the indoor unit
desired to be the main unit.

Set to the main unit address
within a same group in serial or­der.

[Main unit +1, +2, +3, .... ]

Set any address after setting all
indoor units.

–

Set by the main/sub selector
switch.

The lowest address of indoor
unit within refrigerant system
+ 50

00

00

Main

b. Centralized control transmission line

Apply jumper wiring between M1, M2 terminals of centralized control transmission line terminal blocks (TB7) on

each OC. On one OC only, replace the power selecting connector (CN41) with (CN40). Set the centralized control

switch (SW2-1) on the main board of all outdoor units to “ON.”

❉ Make sure to use shielded wire.

Connection of shielded wire:

Apply jumper wiring to connect the shielded earth to S-terminal of the terminal block (TB7) on each OC. Connect S-

terminal of the terminal block (TB7) on one OC with (CN40) connected to the earth screw ( ) of the electrical

parts box.

51 ~ 100

Hex. unit

Comp. unit

5 Sub unit OS Oundoor unit address + 1

00