Mitsubishi PUHY-(E)P200, PUHY-P250, PUHY-(E)P300, PUHY-P350, PUHY-(E)P400 SERVICE MANUAL

AIR CONDITIONERS

Models

PUHY-(E)P200, P250, (E)P300, P350, (E)P400, (E)P450YHM-A
PUHY-(E)P500, (E)P550, (E)P600, (E)P650YSHM-A
PUHY-(E)P700, (E)P750, (E)P800, (E)P850, (E)P900YSHM-A

PUHY-P950, P1000, P1050, P1100, P1150, P1200, P1250YSHM-A

Service Handbook

Safety Precautions

Before installing the unit, thoroughly read the following safety precautions.
Observe these safety precautions for your safety.

WARNING

This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid

the risk of serious injury or death.

CAUTION

This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid

the risk of serious injury or damage to the unit.

After reading this manual, give it to the user to retain for future reference.
Keep this manual for easy reference. When the unit is moved or repaired, give this manual to those who provide these

services.
When the user changes, make sure that the new user receives this manual.

WARNING

Ask your dealer or a qualified technician to install the
unit.

Improper installation by the user may result in water leak­age, electric shock, smoke, and/or fire.

Properly install the unit on a surface that can with­stand the weight of the unit.

Unit installed on an unstable surface may fall and cause in­jury.

Only use specified cables. Securely connect each ca­ble so that the terminals do not carry the weight of the
cable.

Improperly connected or fixed cables may produce heat
and start a fire.

Take appropriate safety measures against strong
winds and earthquakes to prevent the unit from falling.

If the unit is not installed properly, the unit may fall and
cause serious injury to the person or damage to the unit.

Do not make any modifications or alterations to the
unit. Consult your dealer for repair.

Improper repair may result in water leakage, electric shock,
smoke, and/or fire.

In the event of a refrigerant leak, thoroughly ventilate
the room.

If refrigerant gas leaks and comes in contact with an open
flame, poisonous gases will be produced.

When installing the All-Fresh type units, take it into
consideration that the outside air may be discharged
directly into the room when the thermo is turned off.

Direct exposure to outdoor air may have an adverse effect
on health. It may also result in food spoilage.

Properly install the unit according to the instructions
in the installation manual.

Improper installation may result in water leakage, electric
shock, smoke, and/or fire.

Have all electrical work performed by an authorized
electrician according to the local regulations and in­structions in this manual, and a dedicated circuit must
be used.

Insufficient capacity of the power supply circuit or improper
installation may result in malfunctions of the unit, electric
shock, smoke, and/or fire.

Do not touch the heat exchanger fins.

The fins are sharp and dangerous.

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WARNING

Securely attach the terminal block cover (panel) to the
unit.

If the terminal block cover (panel) is not installed properly,
dust and/or water may infiltrate and pose a risk of electric
shock, smoke, and/or fire.

Only use the type of refrigerant that is indicated on the
unit when installing or reinstalling the unit.

Infiltration of any other type of refrigerant or air into the unit
may adversely affect the refrigerant cycle and may cause
the pipes to burst or explode.

When installing the unit in a small room, exercise cau­tion and take measures against leaked refrigerant
reaching the limiting concentration.

Consult your dealer with any questions regarding limiting
concentrations and for precautionary measures before in­stalling the unit. Leaked refrigerant gas exceeding the lim­iting concentration causes oxygen deficiency.

Consult your dealer or a specialist when moving or re­installing the unit.

Improper installation may result in water leakage, electric
shock, and/or fire.

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

If leaked refrigerant is exposed to a heat source, such as a
fan heater, stove, or electric grill, poisonous gases may be
produced.

Do not try to defeat the safety features of the unit.

Forced operation of the pressure switch or the temperature
switch by defeating the safety features of these devices, or
the use of accessories other than the ones that are recom­mended by MITSUBISHI may result in smoke, fire, and/or
explosion.

Only use accessories recommended by MITSUBISHI.

Ask a qualified technician to install the unit. Improper instal­lation by the user may result in water leakage, electric
shock, smoke, and/or fire.

Control box houses high-voltage parts.

When opening or closing the front panel of the control box,
do not let it come into contact with any of the internal com­ponents. Before inspecting the inside of the control box,
turn off the power, keep the unit off for at least 10 minutes,
and confirm that the voltage between FT-P and FT-N on
INV Board has dropped to DC20V or less. (It takes about
10 minutes to discharge electricity after the power supply is
turned off.)

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Precautions for handling units for use with R410A

CAUTION

Do not use the existing refrigerant piping.

A large amount of chlorine that may be contained in the re-

sidual refrigerant and refrigerating machine oil in the exist­ing piping may cause the refrigerating machine oil in the
new unit to deteriorate.

R410A is a high-pressure refrigerant and can cause the

existing pipes to burst.

Use refrigerant pipes made of phosphorus deoxidized
copper. Keep the inner and outer surfaces of the pipes
clean and free of such contaminants as sulfur, oxides,
dust, dirt, shaving particles, oil, and water.

These types of contaminants inside the refrigerant pipes
may cause the refrigerant oil to deteriorate.

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

Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate or
cause the unit to malfunction.

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

Infiltration of a large amount of mineral oil may cause the re­frigerating machine oil to deteriorate.

Charge liquid refrigerant (as opposed to gaseous re­frigerant) into the system.

If gaseous refrigerant is charged into the system, the com­position of the refrigerant in the cylinder will change and
may result in performance loss.

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

If a vacuum pump that is not equipped with a reverse-flow
check valve is used, the vacuum pump oil may flow into the
refrigerant cycle and cause the refrigerating machine oil to
deteriorate.

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

If the refrigerant or the refrigerating machine oil left on

these tools are mixed in with R410A, it may cause the re­frigerating machine oil to deteriorate.

Infiltration of water may cause the refrigerating machine

oil to deteriorate.

Gas leak detectors for conventional refrigerants will not

detect an R410A leak because R410A is free of chlorine.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of the refrig­erant will change, and the unit may experience power loss.

Exercise special care when handling the tools for use
with R410A.

Infiltration of dust, dirt, or water into the refrigerant system
may cause the refrigerating machine oil to deteriorate.

Only use refrigerant R410A.

The use of other types of refrigerant that contain chlorine
(i.e. R22) may cause the refrigerating machine oil to deteri­orate.

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Before installing the unit

WARNING

Do not install the unit where a gas leak may occur.

If gaseous refrigerant leaks and piles up around the unit, it
may be ignited.

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

The unit is not designed to preserve food products.

Do not use the unit in an unusual environment.

Do not install the unit where a large amount of oil or steam

is present or where acidic or alkaline solutions or chemical
sprays are used frequently. Doing so may lead to a re­markable drop in performance, electric shock, malfunc­tions, smoke, and/or fire.

The presence of organic solvents or corrosive gas (i.e.

ammonia, sulfur compounds, and acid) may cause gas
leakage or water leakage.

When installing the unit in a hospital, take appropriate
measures to reduce noise interference.

High-frequency medical equipment may interfere with the
normal operation of the air conditioner or vice versa.

Do not install the unit on or over things that cannot get
wet.

When the humidity level exceeds 80% or if the drainage
system is clogged, the indoor unit may drip water. Drain wa­ter is also discharged from the outdoor unit. Install a central­ized drainage system if necessary.

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Before installing the unit (moving and reinstalling the unit) and performing
electrical work

CAUTION

Properly ground the unit.

Do not connect the grounding wire to a gas pipe, water pipe,
lightning rod, or grounding wire from a telephone pole. Im­proper grounding may result in electric shock, smoke, fire,
and/or malfunction due to noise interference.

Do not put tension on the power supply wires.

If tension is put on the wires, they may break and result in
excessive heat, smoke, and/or fire.

Install an earth leakage breaker to avoid the risk of
electric shock.

Failure to install an earth leakage breaker may result in
electric shock, smoke, and/or fire.

Use the kind of power supply wires that are specified
in the installation manual.

The use of wrong kind of power supply wires may result in
current leak, electric shock, and/or fire.

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

The use of wrong capacity fuses, steel wires, or copper
wires may result in malfunctions, smoke, and/or fire.

Periodically check the installation base for damage.

If the unit is left on a damaged platform, it may fall and
cause injury.

Properly install the drain pipes according to the in­structions in the installation manual. Keep them insu­lated to avoid dew condensation.

Improper plumbing work may result in water leakage and
damage to the furnishings.

Exercise caution when transporting products.

Products weighing more than 20 kg should not be carried

alone.

Do not carry the product by the PP bands that are used on

some products.

Do not touch the heat exchanger fins. They are sharp and

dangerous.

When lifting the unit with a crane, secure all four corners

to prevent the unit from falling.

Properly dispose of the packing materials.

Nails and wood pieces in the package may pose a risk of

injury.

Plastic bags may pose a risk of choking hazard to chil-

dren. Tear plastic bags into pieces before disposing of
them.

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

Otherwise, electric shock and/or fire may result.

When handling units, always wear protective gloves to
protect your hands from metal parts and high-tempera­ture parts.

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Before the test run

CAUTION

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

Keep the unit turned on throughout the season. If the unit is
turned off in the middle of a season, it may result in malfunc­tions.

To avoid the risk of electric shock or malfunction of the
unit, do not operate switches with wet hands.

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

During or immediately after operation, certain parts of the
unit such as pipes and compressor may be either very cold
or hot, depending on the state of the refrigerant in the unit
at the time. To reduce the risk of frost bites and burns, do
not touch these parts with bare hands.

Do not operate the unit without panels and safety
guards.

Rotating, high-temperature, or high-voltage parts on the unit
pose a risk of burns and/or electric shock.

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

Keep the unit on for at least five minutes before turning off
the power to prevent water leakage or malfunction.

Do not operate the unit without the air filter.

Dust particles may build up in the system and cause mal­functions.

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CONTENTS

I Read Before Servicing

[1] Read Before Servicing.............................................................................................................. 3

[2] Necessary Tools and Materials ................................................................................................ 4

[3] Piping Materials ........................................................................................................................ 5

[4] Storage of Piping ...................................................................................................................... 7

[5] Pipe Processing........................................................................................................................ 7

[6] Brazing...................................................................................................................................... 8

[7] Air Tightness Test..................................................................................................................... 9

[8] Vacuum Drying (Evacuation) ..................................................................................................10

[9] Refrigerant Charging .............................................................................................................. 11

[10] Remedies to be taken in case of a Refrigerant Leak............................................................ 11

[11] Characteristics of the Conventional and the New Refrigerants ............................................ 12

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

II Restrictions

[1] System configuration .............................................................................................................. 17

[2] Types and Maximum allowable Length of Cables .................................................................. 19

[3] Switch Settings and Address Settings .................................................................................... 20

[4] Sample System Connection ................................................................................................... 27

[5] An Example of a System to which an MA Remote Controller is connected ........................... 28

[6] An Example of a System to which an M-NET Remote Controller is connected ..................... 38

[7] An Example of a System to which both MA Remote Controller and

M-NET Remote Controller are connected .............................................................................. 40

[8] Restrictions on Pipe Length.................................................................................................... 42

III Outdoor Unit Components

[1] Outdoor Unit Components and Refrigerant Circuit ................................................................. 49

[2] Control Box of the Outdoor Unit.............................................................................................. 51

[3] Outdoor Unit Circuit Board...................................................................................................... 52

IV Remote Controller

[1] Functions and Specifications of MA and ME Remote Controllers .......................................... 59

[2] Group Settings and Interlock Settings via the ME Remote Controller .................................... 60

[3] Interlock Settings via the MA Remote Controller .................................................................... 64

[4] Using the built-in Temperature Sensor on the Remote Controller.......................................... 65

V Electrical Wiring Diagram

[1] Electrical Wiring Diagram of the Outdoor Unit ........................................................................ 69

[2] Electrical Wiring Diagram of Transmission Booster................................................................ 70

VI Refrigerant Circuit

[1] Refrigerant Circuit Diagram .................................................................................................... 73

[2] Principal Parts and Functions ................................................................................................. 74

VII Control

[1] Functions and Factory Settings of the Dipswitches ................................................................ 81

[2] Controlling the Outdoor Unit ................................................................................................... 87

[3] Operation Flow Chart.............................................................................................................. 99

VIII Test Run Mode

[1] Items to be checked before a Test Run................................................................................ 107

[2] Test Run Method .................................................................................................................. 108

[3] Operating Characteristic and Refrigerant Amount................................................................ 109

[4] Adjusting the Refrigerant Amount......................................................................................... 109

[5] Refrigerant Amount Adjust Mode.......................................................................................... 112

[6] The following symptoms are normal. .................................................................................... 114

[7] Standard Operation Data (Reference Data) ......................................................................... 115

IX Troubleshooting

[1] Error Code Lists.................................................................................................................... 155

[2] Responding to Error Display on the Remote Controller........................................................ 158

[3] Investigation of Transmission Wave Shape/Noise ............................................................... 219

[4] Troubleshooting Principal Parts............................................................................................ 222

[5] Refrigerant Leak ................................................................................................................... 241

[6] Compressor Replacement Instructions................................................................................. 243

[7] Troubleshooting Using the Outdoor Unit LED Error Display................................................. 245

X LED Monitor Display on the Outdoor Unit Board

[1] How to Read the LED on the Service Monitor ...................................................................... 249

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I Read Before Servicing

[1] Read Before Servicing ....................................................................................................... 3

[2] Necessary Tools and Materials.......................................................................................... 4

[3] Piping Materials .................................................................................................................5

[4] Storage of Piping ............................................................................................................... 7

[5] Pipe Processing................................................................................................................. 7

[6] Brazing............................................................................................................................... 8

[7] Air Tightness Test.............................................................................................................. 9

[8] Vacuum Drying (Evacuation) ........................................................................................... 10

[9] Refrigerant Charging........................................................................................................ 11

[10] Remedies to be taken in case of a Refrigerant Leak ....................................................... 11

[11] Characteristics of the Conventional and the New Refrigerants ....................................... 12

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

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[ I Read Before Servicing ]

I Read Before Servicing

[1] Read Before Servicing

1. Check the type of refrigerant used in the system to be serviced.
Refrigerant Type

Multi air conditioner for building application CITY MULTI YHM-A series R410A

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

Refer to this service handbook for symptoms relating to the refrigerant cycle.

3. Thoroughly read the safety precautions at the beginning of this manual.

4. Preparing necessary tools: Prepare a set of tools to be used exclusively with each type of refrigerant.

Refer to "Necessary Tools and Materials" for information on the use of tools.(page 4)

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

Use refrigerant pipes made of phosphorus deoxidized copper. Keep the inner and outer surfaces of the pipes clean and free

of such contaminants as sulfur, oxides, dust, dirt, shaving particles, oil, and water.

These types of contaminants inside the refrigerant pipes may cause the refrigerant oil to deteriorate.

6. If there is a leak of gaseous refrigerant and the remaining refrigerant is exposed to an open flame, a poisonous gas
hydrofluoric acid may form. Keep workplace well ventilated.

CAUTION

Install new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.
The use of refrigerant that contains chloride, such as R22, will cause the refrigerating machine oil to deteriorate.

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[ I Read Before Servicing ]

[2] Necessary Tools and Materials

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

Tools for use with R410A (Adaptability of tools that are for use with R22 or R407C)

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

Tools/Materials Use Notes

Gauge Manifold Evacuation and refrigerant charging Higher than 5.09MPa[738psi] on the

high-pressure side

Charging Hose Evacuation and refrigerant charging The hose diameter is larger than the

conventional model.

Refrigerant Recovery Cylinder Refrigerant recovery

Refrigerant Cylinder Refrigerant charging The refrigerant type is indicated. The

cylinder is pink.

Charging Port on the Refrigerant Cylinder Refrigerant charging The charge port diameter is larger

than that of the current port.

Flare Nut Connection of the unit with the pipes Use Type-2 Flare nuts.

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

Tools/Materials Use Notes

Gas Leak Detector Gas leak detection The ones for use with HFC refrigerant

may be used.

Vacuum Pump Vacuum drying May be used if a check valve adapter

is attached.

Flare Tool Flare processing Flare processing dimensions for the

piping in the system using the new re­frigerant differ from those of R22. Re­fer to next page.

Refrigerant Recovery Equipment Refrigerant recovery May be used if compatible with

R410A.

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

Tools/Materials Use Notes

Vacuum Pump with a Check Valve Vacuum drying

Bender Bending pipes

Torque Wrench Tightening flare nuts Only the flare processing dimensions

for pipes that have a diameter of
ø12.70 (1/2") and ø15.88 (5/8") have
been changed.

Pipe Cutter Cutting pipes

Welder and Nitrogen Cylinder Welding pipes

Refrigerant Charging Meter Refrigerant charging

Vacuum Gauge Vacuum level check

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

Tools/Materials Use Notes

Charging Cylinder Refrigerant charging Prohibited to use

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

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[ I Read Before Servicing ]

[3] Piping Materials

Do not use the existing piping!

1. Copper pipe materials

O-material (Annealed) Soft copper pipes (annealed copper pipes). They can easily be bent with hands.

1/2H-material (Drawn) Hard copper pipes (straight pipes). They are stronger than the O-material (Annealed)

at the same radial thickness.

The distinction between O-materials (Annealed) and 1/2H-materials (Drawn) is made based on the strength of the pipes them-

selves.

O-materials (Annealed) can easily be bent with hands.
1/2H-materials (Drawn) are considerably stronger than O-material (Annealed) at the same thickness.

2. Types of copper pipes

Maximum working pressure Refrigerant type

3.45 MPa [500psi] R22, R407C etc.

4.30 MPa [624psi] R410A etc.

3. Piping materials/Radial thickness

Use refrigerant pipes made of phosphorus deoxidized copper.
The operation pressure of the units that use R410A is higher than that of the units that use R22.
Use pipes that have 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.)

Pipe size (mm[in]) Radial thickness (mm) Type

ø6.35 [1/4"] 0.8t

ø9.52 [3/8"] 0.8t

ø12.7 [1/2"] 0.8t

ø15.88 [5/8"] 1.0t

ø19.05 [3/4"] 1.0t

ø22.2 [7/8"] 1.0t

ø25.4 [1"] 1.0t

ø28.58 [1-1/8"] 1.0t

ø31.75 [1-1/4"] 1.1t

ø34.93 [1-3/8"] 1.1t

ø41.28 [1-5/8"] 1.2t

The pipes in the system that uses the refrigerant currently on the market are made with O-material (Annealed), even if the

pipe diameter is less than ø19.05 (3/4"). For a system that uses R410A, use pipes that are made with 1/2H-material (Drawn)
unless the pipe diameter is at least ø19.05 (3/4") and the radial thickness is at least 1.2t.

The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes

that meet the local standards.

O-material (Annealed)

1/2H-material,

H-material (Drawn)

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[ I Read Before Servicing ]

4. Thickness and refrigerant type indicated on the piping materials

Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant.

5. Flare processing (O-material (Annealed) and OL-material only)

The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system.

Flare processing dimensions (mm[in])

A dimension (mm)

Pipe size (mm[in])

R410A R22, R407C

ø6.35 [1/4"] 9.1 9.0

ø9.52 [3/8"] 13.2 13.0

ø12.7 [1/2"] 16.6 16.2

Dimension A

ø15.88 [5/8"] 19.7 19.4

ø19.05 [3/4"] 24.0 23.3

If a clutch-type flare tool is used to flare the pipes in the system using R410A, the length of the pipes must be between 1.0
and 1.5 mm. For margin adjustment, a copper pipe gauge is necessary.

6. Flare nut

The flare nut type has been changed to increase the strength. The size of some of the flare nuts have also been changed.

Flare nut dimensions (mm[in])

B dimension (mm)

Pipe size (mm[in])

R410A R22, R407C

ø6.35 [1/4"] 17.0 17.0

ø9.52 [3/8"] 22.0 22.0

ø12.7 [1/2"] 26.0 24.0

Dimension B

ø15.88 [5/8"] 29.0 27.0

ø19.05 [3/4"] 36.0 36.0

The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use pipes
that meet the local standards.

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[ I Read Before Servicing ]

[4] Storage of Piping

1. Storage location

Store the pipes to be used indoors. (Warehouse at site or owner's warehouse)
If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe.

2. Sealing the pipe ends

Both ends of the pipes should be sealed until just before brazing.
Keep elbow pipes and T-joints in plastic bags.

The new refrigerator oil is 10 times as hygroscopic as the conventional refrigerating machine oil (such as Suniso) and, if not
handled with care, could easily introduce moisture into the system. Keep moisture out of the pipes, for it will cause the oil to
deteriorate and cause a compressor failure.

[5] Pipe Processing

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

Use a minimum amount of oil.
Use only ester oil, ether oil, and alkylbenzene.

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[ I Read Before Servicing ]

[6] Brazing

No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide
scale, water, and dust) out of the refrigerant system.

Example: Inside the brazed connection

Use of oxidized solder for brazing Use of non-oxidized solder for brazing

1. Items to be strictly observed

Do not conduct refrigerant piping work outdoors if raining.
Use non-oxidized solder.
Use a brazing material (BCuP-3) that requires no flux when brazing between copper pipes or between a copper pipe and

copper coupling.

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

2. Reasons

The new refrigerating machine oil is 10 times as hygroscopic as the conventional oil and is more likely to cause unit failure if

water infiltrates into the system.

Flux generally contains chloride. Residual flux in the refrigerant circuit will cause sludge to form.

3. Notes

Do not use commercially available antioxidants because they may cause the pipes to corrode or refrigerating machine oil to
deteriorate.

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[ I Read Before Servicing ]

[7] Air Tightness Test

No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak.

Halide torch R22 leakage detector

1. Items to be strictly observed

Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tight-

ness, taking temperature variations into account.

When using refrigerant instead of a leak detector to find the location of a leak, use R410A.
Refrigerant R410A must be charged in its liquid state (vs. gaseous state).

2. Reasons

Oxygen, if used for an air tightness test, poses a risk of explosion. (Only use nitrogen to check air tightness.)
Refrigerant R410A must be charged in its liquid state. If gaseous refrigerant in the cylinder is drawn out first, the composition

of the remaining refrigerant in the cylinder will change and become unsuitable for use.

3. Notes

Procure a leak detector that is specifically designed to detect an HFC leak. A leak detector for R22 will not detect an
HFC(R410A, R407C) leak.

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[ I Read Before Servicing ]

[8] Vacuum Drying (Evacuation)

(Photo1) 15010H (Photo2) 14010

Recommended vacuum gauge:
ROBINAIR 14010 Thermistor Vacuum Gauge

1. Vacuum pump with a reverse-flow check valve (Photo1)

To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum
pump with a reverse-flow check valve.
A reverse-flow check valve may also be added to the vacuum pump currently in use.

2. Standard of vacuum degree (Photo 2)

Use a vacuum pump that attains 0.5Torr(65Pa) or lower degree of vacuum after 5 minutes of operation, and connect it directly
to the vacuum gauge. Use a pump well-maintained with an appropriate lubricant. A poorly maintained vacuum pump may not
be able to attain the desired degree of vacuum.

3. Required precision of vacuum gauge

Use a vacuum gauge that registers a vacuum degree of 5Torr(650Pa) and measures at intervals of 1Torr(130Pa). (A recom­mended vacuum gauge is shown in Photo2.)
Do not use a commonly used gauge manifold because it cannot register a vacuum degree of 5Torr(650Pa).

4. Evacuation time

After the degree of vacuum has reached 5Torr(650Pa), evacuate for an additional 1 hour. (A thorough vacuum drying re-

moves moisture in the pipes.)

Verify that the vacuum degree has not risen by more than 1Torr(130Pa) 1hour after evacuation. A rise by less than

1Torr(130Pa) is acceptable.

If the vacuum is lost by more than 1Torr(130Pa), conduct evacuation, following the instructions in section 6. Special vacuum

drying.

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 5Torr(650Pa) or lower degree of vacuum cannot be attained after 3 hours of evacuation, it is likely that water has pen-

etrated the system or that there is a leak.

If water infiltrates the system, break the vacuum with nitrogen. Pressurize the system with nitrogen gas to

0.5kgf/cm

2

G(0.05MPa) and evacuate again. Repeat this cycle of pressurizing and evacuation either until the degree of vac-

uum below 5Torr(650Pa) is attained or until the pressure stops rising.

Only use nitrogen gas for vacuum breaking. (The use of oxygen may result in an explosion.)

HWE07010 GB

- 10 -

[ I Read Before Servicing ]

[9] Refrigerant Charging

Cylinder with a siphon

Cylinder without a siphon

Cylin-

Cylin-

der

der

Cylinder color R410A is pink. Refrigerant charging in the liquid state

Valve Valve

liquid

liquid

1. Reasons

R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be handled
the same way as a single refrigerant, such as R22. To be safe, however, draw out the refrigerant from the cylinder in the liquid
phase. If the refrigerant in the gaseous phase is drawn out, the composition of the remaining refrigerant will change and be­come unsuitable for use.

2. Notes

When using a cylinder with a siphon, refrigerant is charged in the liquid state without the need for turning it upside down. Check
the type of the cylinder on the label before use.

[10] Remedies to be taken in case of a Refrigerant Leak

If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced. (Charge refrigerant in the
liquid state.)
Refer to "IX [5] Refrigerant Leak".(page 241)

HWE07010 GB

- 11 -

[ I Read Before Servicing ]

[11] Characteristics of the Conventional and the New Refrigerants

1. Chemical property

As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant.
However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will
accumulate at the bottom of the room and may cause hypoxia.
If exposed to an open flame, refrigerant will generate poisonous gases. Do not perform installation or service work in a con­fined area.

New Refrigerant (HFC type) Conventional Refriger-

ant (HCFC type)

R410A R407C R22

R32/R125 R32/R125/R134a R22

Composition (wt%) (50/50) (23/25/52) (100)

Type of Refrigerant Pseudo-azeotropic

Refrigerant

Non-azeotropic

Refrigerant

Single Refrigerant

Chloride Not included Not included Included

Safety Class A1/A1 A1/A1 A1

Molecular Weight 72.6 86.2 86.5

Boiling Point (°C/°F) -51.4/-60.5 -43.6/-46.4 -40.8/-41.4

Steam Pressure

1.557/226 0.9177/133 0.94/136

(25°C,MPa/77°F,psi) (gauge)

Saturated Steam Density
(25°C,kg/m

3

/77°F,psi)

64.0 42.5 44.4

Flammability Nonflammable Nonflammable Nonflammable

Ozone Depletion Coefficient (ODP)

Global Warming Coefficient (GWP)

Refrigerant Charging Method Refrigerant charging in

Replenishment of Refrigerant after a Refrigerant

*1

*2

0 0 0.055

1730 1530 1700

the liquid state

Refrigerant charging in

the liquid state

Refrigerant charging in

the gaseous state

Available Available Available

Leak

*1 When CFC11 is used as a reference
*2 When CO

is used as a reference

2

2. Refrigerant composition

R410A is a pseudo-azeotropic HFC blend and can almost be handled the same way as a single refrigerant, such as R22. To
be safe, however, draw out the refrigerant from the cylinder in the liquid phase. If the refrigerant in the gaseous phase is drawn
out, the composition of the remaining refrigerant will change and become unsuitable for use.
If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced.

3. Pressure characteristics

The pressure in the system using R410A is 1.6 times as great as that in the system using R22.

Pressure (gauge)

Temperature (°C/°F)

R410A R407C R22

MPa/psi MPa/psi MPa/psi

-20/-4 0.30/44 0.18/26 0.14/20

0/32 0.70/102 0.47/68 0.40/58

20/68 1.34/194 0.94/136 0.81/117

40/104 2.31/335 1.44/209 1.44/209

60/140 3.73/541 2.44/354 2.33/338

65/149 4.17/605 2.75/399 2.60/377

HWE07010 GB

- 12 -

[ I Read Before Servicing ]

[12] 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 system.
Note that the ester oil used in the system has properties that are different from commercially available ester oil.

Refrigerant Refrigerating machine oil

R22 Mineral oil

R407C Ester oil

R410A Ester oil

2. Effects of contaminants

*1

Refrigerating machine oil used in the HFC system must be handled with special care to keep contaminants out.
The table below shows the effect of contaminants in the refrigerating machine oil on the refrigeration cycle.

3. The effects of contaminants in the refrigerating machine oil on the refrigeration cycle.

Cause Symptoms Effects on the refrigerant cycle

Water infiltration Frozen expansion valve

and capillary tubes

Clogged expansion valve and capillary tubes
Poor cooling performance
Compressor overheat
Motor insulation failure
Burnt motor
Coppering of the orbiting scroll
Lock
Burn-in on the orbiting scroll

Hydrolysis

Sludge formation and ad­hesion
Acid generation
Oxidization
Oil degradation

Air infiltration Oxidization

Adhesion to expansion valve and capillary
tubes

Clogged expansion valve, capillary tubes, and
drier
Poor cooling performance

Infiltration of
contaminants

Dust, dirt

Infiltration of contaminants into the com­pressor

Compressor overheat

Burn-in on the orbiting scroll

Sludge formation and adhesion Clogged expansion valve and capillary tubes

Mineral oil
etc.

Poor cooling performance
Compressor overheat

Oil degradation Burn-in on the orbiting scroll

*1. Contaminants is defined as moisture, air, processing oil, dust/dirt, wrong types of refrigerant, and refrigerating machine oil.

HWE07010 GB

- 13 -

- 14 -

II Restrictions

[1] System configuration ....................................................................................................... 17

[2] Types and Maximum allowable Length of Cables ........................................................... 19

[3] Switch Settings and Address Settings ............................................................................. 20

[4] Sample System Connection............................................................................................. 27

[5] An Example of a System to which an MA Remote Controller is connected..................... 28

[6] An Example of a System to which an M-NET Remote Controller is connected............... 38

[7] An Example of a System to which both MA Remote Controller and

M-NET Remote Controller are connected........................................................................ 40

[8] Restrictions on Pipe Length ............................................................................................. 42

HWE07010 GB

- 15 -

- 16 -

[ II Restrictions ]

II Restrictions

[1] System configuration

1. Table of compatible indoor units

The table below summarizes the types of indoor units that are compatible with different types of outdoor units.

(1) Standard comb inations

Outdoor

units

Composing units Maximum total capacity

of connectable indoor

units

Maximum number
of connectable in-

door units

Types of connectable in-

door units

200 - - - 100 - 260 17 P15 - P200 models
250 - - - 125 - 325 21

R410A series indoor units

300 - - - 150 - 390 26
350 - - - 175 - 455 30 P15 - P400 models

R410A series indoor units
400 - - - 200 - 520 34 P15 - P500 models
450 - - - 225 - 585 39

R410A series indoor units

500 250 250 - 250 - 650 43
550 300 250 - 275 - 715 47
600 350 250 - 300 - 780 50
650 350 300 - 325 - 845
700 350 350 - 350 - 910
750 400 350 - 375 - 975
800 450 350 - 400 - 1040
850 450 400 - 425 - 1105
900 450 450 - 450 - 1170
950 400 300 250 475 - 1235
1000 400 300 300 500 - 1300
1050 400 350 300 525 - 1365
1100 400 350 350 550 - 1430
1150 450 350 350 575 - 1495
1200 450 400 350 600 - 1560
1250 450 450 350 625 - 1625

1) "Maximum total capacity of connectable indoor units" refers to the sum of the numeric values in the indoor unit model names.

2) If the total capacity of the indoor units that are connected to a given outdoor unit exceeds the capacity of the outdoor unit, the
indoor units will not be able to perform at the rated capacity when they are operated simultaneously. Select a combination of
units so that the total capacity of the connected indoor units is at or below the capacity of the outdoor unit whenever possible.

HWE07010 GB

- 17 -

[ II Restrictions ]

(2) High COP combinations

Outdoor

units

Composing units Maximum total capacity

of connectable indoor

units

Maximum number
of connectable in-

door units

Types of connectable in-

door units

200 - - - 100 - 260 17 P15 - P200 models
300 - - - 150 - 390 26

R410A series indoor units

400 200 200 - 200 - 520 34 P15 - P500 models
450 250 200 - 225 - 585 39

R410A series indoor units

500 300 200 - 250 - 650 43
550 300 250 - 275 - 715 47
600 300 300 - 300 - 780 50
650 350 300 - 325 - 845
700 300 200 200 350 - 910
750 300 250 200 375 - 975
800 300 300 200 400 - 1040
850 300 300 250 425 - 1105
900 300 300 300 450 - 1170

1) "Maximum total capacity of connectable indoor units" refers to the sum of the numeric values in the indoor unit model names.

2) If the total capacity of the indoor units that are connected to a given outdoor unit exceeds the capacity of the outdoor unit, the
indoor units will not be able to perform at the rated capacity when they are operated simultaneously. Select a combination of
units so that the total capacity of the connected indoor units is at or below the capacity of the outdoor unit whenever possible.

HWE07010 GB

- 18 -

[ II Restrictions ]

[2] Types and Maximum allowable Length of Cables

1. Wiring work

(1) Notes

1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man­ual.

2) Instal l external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference.
(Donot put the control cable and power supply cable in the same conduit tube.)

3) Provide grounding for the outdoor unit as required.

4) Run the cable from the electric box of the indoor or outdoor unit in such way that the box is accessible for servicing.

5) Do not connect power supply wiring to the terminal block for transmission line. Doing so will damage the electronic compo­nents on the terminal block.

6) Use 2-core shielded cables as transmission cables.
Use a separate 2-core control cable for each refrigerant system. Do not use a single multiple-core cable to connect indoor

units that belong to different refrigerant systems. The use of a multiple-core cable may result in signal transmission errors and
malfunctions.

TB

TB

3

TB

TB

3

Outdoor unit

7

7

TB3TB7TB3TB

2-core shielded cable

TB3TB

TB3TB

7

2-core shielded cable

Indoor unit

7

Remote Controller

7

TB3: Terminal block for indoor-outdoor transmission line TB7: Terminal block for centralized control

TB

TB

3

TB

TB

3

Outdoor unit

7

7

TB3TB7TB3TB

TB3TB

TB3TB

7

Indoor unit

7

multiple-core cable

Remote Controller

7

(2) Control wiring

Different types of control wiring are used for different systems.
Refer to section "[5] An Example of a System to which an MA Remote Controller is connected - [7] An Example of a System
to which both MA Remote Controller and M-NET Remote Controller are connected" before performing wiring work.

Types and maximum allowable length of cables

Control lines are categorized into 2 types: transmission line and remote controller line.
Use the appropriate type of cables and observe the maximum allowable length specified for a given system. If a given system

has a long transmission line or if a noise source is located near the unit, place the unit away from the noise source to reduce
noise interference.

1) M-NET transmission line

Facility
type

All facility types

Type Shielded cable CVVS, CPEVS, MVVS

Cable type

Number of
cores

Cable size Larger than 1.25mm

2-core cable

2

[AWG16]

Maximum transmission
line distance between the
outdoor unit and the far-

200 m [656ft] max.

thest indoor unit
Maximum transmission

line distance for central­ized control and Indoor/
outdoor transmission line
(Maximum line distance

500 m [1640ft] max.
*The maximum overall line length from the power supply unit on the transmission lines for
centralized control to each outdoor unit or to the system controller is 200m [656ft] max.

via outdoor unit)

HWE07010 GB

- 19 -

[ II Restrictions ]

2) Remote controller wiring

MA remote controller
Type CVV CVV
Number of

cores

Cable type

Cable size

2-core cable 2-core cable

0.3 to 1.25mm
[AWG22 to 16]
(0.75 to 1.25mm2 )
[AWG18 to 16]

Maximum overall line
length

200 m [656ft] max.

*1 MA remote controller refers to MA remote controller (PAR-20MAA, PAR-21MAA), MA simple remote controller, and

wireless remote controller.
*2 M-NET remote controller refers to ME remote controller and ME simple remote controller.
*3 The use of cables that are smaller than 0.75mm
*4 When connected to the terminal block on the Simple remote controller, use cables that meet the cable size specifi-

cations shown in the parenthesis.

[3] Switch Settings and Address Settings

2 *3

*4

*1

0.3 to 1.25mm
[AWG22 to 16]
(0.75 to 1.25mm2 )

M-NET remote controller

[AWG18 to 16]
The section of the cable that exceeds 10m

[32ft] must be included in the maximum in­door-outdoor transmission line distance.

2

(AWG18) is recommended for easy handling.

2 *3

*4

*2

1. Switch setting

Refer to section "[5] An Example of a System to which an MA Remote Controller is connected - [7] An Example of a System
to which both MA Remote Controller and M-NET Remote Controller are connected" before performing wiring work.
Set the switches while the power is turned off.
If the switch settings are changed while the unit is being powered, those changes will not take effect, and the unit will not
function properly.

Units on which to set the switches Symbol Units to which the power must be shut off

*3

CITY MULTI indoor unit Main/sub unit IC Outdoor units
LOSSNAY, OA processing unit

*1

LC Outdoo r units

Air handling kit IC Outdoor units

and Indoor units

*3

and LOSSNAY

*3

or field supplied air handling

unit

M-NET remote controller Main/sub remote

RC Outdoor units

*3

controller

MA remote controller Main/sub remote

MA Indoor units

controller

CITY MULTI outdoor unit

*2

OC,OS1,OS2 Outdoor units

*3

*1. Applicable when LOSSNAY units are connected to the indoor-outdoor transmission line.
*2. The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2 in the order of

capacity from large to small (if two or more units have the same capacity, in the order of address from small to large).

*3. Turn off the power to all the outdoor units in the same refrigerant circuit.

HWE07010 GB

- 20 -

[ II Restrictions ]

2. M-NET Address settings
(1) Address settings table

The need for address settings and the range of address setting depend on the configuration of the system.

Unit or controller Address setting

Setting method Facto-

range

CITY MULTI in­door unit

Main/sub unit 00,

01 to 50

*1

Assign the smallest address to the main indoor u nit in the
group, and assign sequential address numbers to the rest
of the indoor units in the same group.

*4

M-NET adapter
M-NET control in-

terface
Free Plan adapt-

er
LOSSNAY, OA processing unit

Air handling kit

00,
01 to 50

*1

Assign an arbitrary but unique address to each of
these units after assigning an address to all indoor
units.

M-NET remote
controller

Main remote
controller

Sub remote
controller

101 to 150 Add 100 to the smallest address of all the indoor units

in the same group.

151 to 200

*2

Add 150 to the smallest address of all the indoor units
in the same group.

MA remote controller No address settings required. (The main/sub setting must be made if 2

remote controllers are connected to the system.)

CITY MULTI outdoor unit 00,

51 to 100

*1,*3

Assign sequential addresses to the outdoor units in the
same refrigerant circuit. The outdoor units in the same
refrigerant circuit are automatically designated as OC
and OS.

*5

ry set-

ting

00

00

101

Main

00

System controller Group remote

controller
System remote

controller
ON/OFF re-

mote controller
Schedule timer

(compatible

201 to 250 Assign an address that equals the sum of the smallest

group number of the group to be controlled and 200.
Assign an arbitrary but unique address within the

range listed on the left to each unit.
Assign an address that equals the sum of the smallest

group number of the group to be controlled and 200.
Assign an arbitrary but unique address within the

range listed on the left to each unit.

201

202

with M-NET)
Central con-

troller
G(B)-50A

000,
201 to 250

Assign an arbitrary but unique address within the
range listed on the left to each unit. The address must
be set to "000" to control the K-control unit.

LM adapter 201 to 250 Assign an arbitrary but unique address within the

000

247

range listed on the left to each unit.

*1. Address setting is not required for a City Multi system that consists of a single refrigerant circuit (with some exceptions).
*2. To set the M-NET remote controller address to "200", set it to "00".
*3. To set the outdoor unit address to "100," set the switches to "50."
*4. Some indoor units have 2 or 3 controller boards that require address settings.

No. 2 controller board address must be equal to the sum of the No. 1 controller board address and 1, and the No.3

controller board address must equal to the No. 1 controller address and 2.

*5. The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2 in the order of

capacity from large to small (if two or more units have the same capacity, in the order of address from small to large).

HWE07010 GB

- 21 -

[ II Restrictions ]

(2) Power supply switch connector connection on the outdoor unit

(Factory setting: The male power supply switch connector is conn ected to CN41.)

System configu­ration

Connection to
the system con­troller

Power supply unit
for transmission
lines

Group operation
of units in a sys­tem with multiple

Power supply switch connector connection

outdoor units

System with
one outdoor unit

System with
multiple outdoor
units

_ _ _ Leave CN41 as it is

(Factory setting)

Not connected _ Not grouped

Grouped Disconnect the male connecto r from the fe-

With connection
to the indoor
unit system

With connection
to the central­ized control
system

Not required Grouped/not

grouped

Not required
(Powered from the

*1

Grouped/not
grouped

outdoor unit)

Required *1 Grouped/not

grouped

male power supply switch connector (CN41)
and connect it to the female power supply
switch connector (CN40) on only one of the
outdoor units.

*Connect the S (shielded) terminal on the ter-

minal block (TB7) on the outdoor unit whose
CN41 was replaced with CN40 to the
ground terminal ( ) on the electric box.

Leave CN41 as it is
(Factory setting)

*2

*1 The need for a power supply unit for transmission lines depends on the system configuration.
*2 The replacement of the power jumper connector from CN41 to CN40 must be performed on only one outdoor unit in the system.

(3) Settings for the centralized control switch for the outdoor unit (Factory setting: SW2-1 are set to OFF.)

System configuration Centralized control switch settings

*1

Connection to the system controller Not connected Leave it to OFF. (Factory setting)
Connection to the system controller Connected

*2

ON

*1. Set SW2-1 on all outdoor units in the same refrigerant circuit to the same setting.
*2. When only the LM adapter is connected, leave SW2-1 to OFF (as it is).

(4) Selecting the position of temperature detection for the indoor unit (Factory setting: SW1-1 set to "OFF".)

To stop the fan during heating Thermo-OFF (SW1-7 and 1-8 on the indoor units to be set to ON), use the built-in thermistor
on the remote controller or an optional thermistor.

1) To use the built-in sensor on the remote controller, set th e SW1-1 to ON.
Some models of remote controllers are not equipped with a built-in temperature sensor.

Use the built-in temperature sensor on the indoor unit instead.

When using the built-in sensor on the remote controller, install the remote controller where room temperature can be detected.

(Note) Factory setting for SW1-1 on the indoor unit of the All-Fresh Models is ON.

2) When an optional temperature sensor is used, set SW1-1 to OFF, and set SW3-8 to ON.
When using an optional temperature sensor, install it where room temperature can be detected.

(5) Various start-stop controls (Indoor unit settings)

Each indoor unit (or group of indoor units) can be controlled individually by setting SW 1-9 and 1-10.

Function

Power ON/OFF by
the plug

*1,*2,*3

Automatic restoration
after power failure

Operation of the indoor unit when the operation is resumed after the unit was

stopped

Indoor unit will go into operation regardless of its operation status before power
off (power failure). (In approx. 5 minutes)

Indoor unit will go into operation if it was in operation when the power was
turned off (or cut off due to power failure). (In approx. 5 minutes)

Indoor unit will remain stopped regardless of its operation status before power

Setting (SW1)

910

OFF ON

ON OFF

OFF ON

off (power failure).

*4 *5

*1. Do not cut off power to the outdoor unit. Cutting off the power supply to the outdoor unit will cut off the power supply to the

crankcase heater and may cause the compressor to malfunction when the unit is put back into operation.
*2. Not applicable to units with a built-in drain pump or humidifier.
*3. Models with a built-in drain pump cannot be turned on/off by the plug individually. All the units in the same refrigerant c ircuits

will be turned on or off by the plug.
*4. Requires that the dipswitch settings for all the units in the group be made.
*5. To control the external input to and output from the air conditioners with the PLC software for general equipment via the G(B)-

50A, set SW1-9 and SW1-10 to ON. With these set ti n gs ma de, the power start-stop fu nction becomes disabled. To use the

auto recovery function after power failure while these settings are made, set SW1-5 to ON.

HWE07010 GB

- 22 -

[ II Restrictions ]

(6) Miscellaneous settings

Cooling-only setting for the indoor unit: Cooling only model (Factory setting: SW3-1 "OFF.")
When using indoor unit as a cooling-only unit, set SW3-1 to ON.

(7) Various types of control using input-output signal connector on the outdoor unit (various connection options)

Type Usage Function

Input Prohibiting cooling/heating operation (thermo OFF) by an external

DEMAND (level) CN3D

input to the outdoor unit.

*It can be used as the DEMAND control device for each system.

Performs a low level noise operation of the outdoor unit by an ex­ternal input to the outdoor unit.

SIlent mode (level)
(Night mode)

*3*4

to be

used

*1

*2

Option

Adapter for
external input
(PAC­SC36NA-E)

Terminal

* It can be used as the silent operation device for each refrigerant
system.

Forces the outdoor unit to perform a fan operation by receiving sig­nals from the snow sensor.

*5

Cooling/heating operation can be changed by an external input to

Snow sensor signal

CN3S

input (level)

Auto-changeover CN3N

the outdoor unit.

Out-

How to extract signals from the outdoor unit

put

*It can be used as an operation status display device.
*It can be used for an interlock operation with external devices.

Operation status of
the compressor

Error status

CN51 Adapter for

external out­put
(PAC­SC37SA-E)

*1. For detailed drawing, refer to "Example of wiring connection".

*2. For details, refer to 1) through 4) shown below.

*3. Silent mode is valid when Dip SW4-4 on the outdoor unit is set to OFF. When DIP SW4-4 is set to ON, 4 levels of on-

DEMAND are possible, using different configurations of silent mode input and DEMAND input settings.When 2 or more
outdoor units exist in one refrigerant circuit system, 8 levels of on-DEMAND are possible. When 3 outdoor units exist in
one refrigerant circuitsystem, 12 levels of on-DEMAND are possible.

*4. Silent mode can be switched from ability main to silent main with Dip SW5-5 on the outdoor unit. Dip SW5-5 OFF: ability

main (ability main mode : The noise level is reduced by limiting the maximum fan frequency under the following condition.
Cooling mode : outdoor temp. (TH7) < 30°C[86°F] Heating mode : outdoor temp. (TH7) > 3°C[37°F]), ON: Emphasizes
quiet

*5. When multiple outdoor units exist in one refrigerant circuit system, settings on every outdoor unit (signal input) are re-

quired.

CAUTION

1) Wiring should be covered by insulation tube with supplementary insulation.

2) Use relays or switches with IEC or equivalent standard.

3) The electric strength between accessible parts and control circuit should have 2750V or more.

HWE07010 GB

- 23 -

[ II Restrictions ]

Example of wiring connection

CN51

Distant control
board

ecruos rewop pmaL

1

L

L

2

L1 : Outdoor unit error display lamp
L2 : Compressor operation lamp (compressor running state)
X, Y : Relay (coil =<0.9W : DC12V)

1. Optional part : PAC-SC37SA-E or field supply.

Relay circuit Adapter

X

Y

Y

X

Preparations

in the field

Maximum cable
length is 10m

1

5
4
3

Outdoor unit
control board

CN51

CN3N

Relay circuit

X

Y

Preparations

in the field

Adapter

2

1
2

3

Maximum cable
length is 10m

Outdoor unit
control board

CN3N

Y

X : Cooling / Heating
Y : Validity / Invalidity of X
X,Y : Relay

2. Optional part : PAC-SC36NA-E or field supply.

CN3S

Relay circuit

X

Preparations

in the field

X : Relay

Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC

Snow sensor : The outdoor fan runs when X is closed

in stop mode or thermostat mode.

2. Optional part : PAC-SC36NA-E or field supply.

X

OFF

OFF

ON

Normal

CoolingONHeating

Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC

Adapter

2

1
2

3

Maximum cable
length is 10m

Outdoor unit
control board

CN3S

CN3D

Relay circuit

Adapter

X

Y

1
2

3

Outdoor unit

2

control board

CN3D

Preparations

in the field

Maximum cable

length is 10m
X : Silent mode
Y : Compressor ON/OFF
X,Y : Relay

Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum appicable load =< 1mA at DC

2. Optional part : PAC-SC36NA-E or field supply.

1
2

Outdoor unit

2

control board

CN3D

Relay circuit

X

Adapter

3

Preparations

in the field

X : Silent mode

X : Relay

Maximum cable
length is 10m

Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC

2. Optional part : PAC-SC36NA-E or field supply.

Silent mode
(Night mode)

: The noise level is reduced by controlling the maximum
fan frequency and maximum compressor frequency.

HWE07010 GB

- 24 -

[ II Restrictions ]

1) SW4-4: OFF (Compressor ON/OFF, Silent mode (Night mode))
CN3D 1-3P Compressor ON/OFF

*1

Open Compressor ON
Short-circuit Compressor OFF

CN3D 1-2P Silent mode

*2

Open OFF
Short-circuit ON

*1. When SW4-4 on the outdoor unit in one refrigerant circuit system is set to ON , this function cannot be used.
*2. This function and the 4 levels or 8 levels on-DEMAND function can be used together. Input the order to CN3D 1-2P on the

outdoor unit whose SW4-4 is set to OFF.

2) When SW4-4 on one outdoor unit in one refrigerant circuit system is set to ON (4 levels of on-DEMAND)

(*3)

CN3D 1-2P
CN3D 1-3P Open Short-circuit
Open 100% (No DEMAND) 75%
Short-circuit 0% (Compressor OFF) 50%

*3. Input the order to CN3D on the outdoor unit whose SW4-4 is set to ON.

Note the following steps to be taken when using the STEP DEMAND

(Example) When switching from 100% to 50%

Demand control

steps

If the step listed as the wrong example above is taken, thermo may go off.
The percentage of the demand listed in the table above is an approximate value based on the
compressor volume and does not necessarily correspond with the capacity.

(Wrong)

(Correct)

100%

100%

0%

75%

50%

50%

3) When SW4-4 on the two outdoor units in one refrige rant circuit system is set to ON (8 levels of on-DEMAND)
8 levels of on-DEMAND No.2 CN3D

1-2P Open Short-circuit

No.1 CN3D 1-2P 1-3P Open Short-circuit Open Short-circuit

Open Open 100% 50% 88% 75%

Short-circuit 50% 0% 38% 25%

Short-circuit Open 88% 38% 75% 63%

Short-circuit 75% 25% 63% 50%

*3. Input the order to CN3D on the outdoor unit whose SW4-4 is set to ON.
*4. CN3D of No. 1, 2, 3 can be selected arbitrary with the outdoor unit whose SW4-4 is set to ON.

(*3, *4)

HWE07010 GB

- 25 -

[ II Restrictions ]

4) When SW4-4 on the all outdoor units in one refrigerant circuit system is set to ON (12 levels of on-DEMAND)
12 levels

of on-DE­MAND

No.2 CN3D 1-2P Open

1-3P Open Short-circuit

No.3 CN3D 1-2P Open Short-circuit Open Short-circuit

No.1
CN3D

1-2P 1-3P Open Short-

circuit

Open Short-

circuit

Open Short-

circuit

Open Short-

Open Open 100% 67% 92% 84% 67% 34% 59% 50%

Short-

67% 34% 59% 50% 34% 0% 25% 17%

circuit

Short-circuit Open 92% 59% 84% 75% 59% 25% 50% 42%

Short-

84% 50% 75% 67% 50% 17% 42% 34%

circuit

12 levels
of on-DE­MAND

No.2 CN3D 1-2P Short-circuit

1-3P Open Short-circuit

No.3 CN3D 1-2P Open Short-circuit Open Short-circuit

No.1
CN3D

1-2P 1-3P Open Short-

circuit

Open Short-

circuit

Open Short-

circuit

Open Short-

Open Open 92% 59% 84% 75% 84% 50% 75% 67%

Short-

59% 25% 50% 42% 50% 17% 42% 34%

circuit

(*4)

circuit

circuit

Short-circuit Open 84% 50% 75% 67% 75% 42% 67% 59%

Short-

75% 42% 67% 59% 67% 34% 59% 50%

circuit

*3. Input the order to CN3D on the outdoor unit whose SW4-4 is set to ON.
*4. CN3D of No. 1, 2, 3 can be selected arbitrary with the outdoor unit whose SW4-4 is set to ON.

HWE07010 GB

- 26 -

[ II Restrictions ]

[4] Sample System Connection

Examples of typical system connection are shown on pages [5] to [7].
Refer to the Installation Manual that came with each device or controller for details.

(1) An example of a system to which an MA remote controller is connected

System

configuration

System with one out-

1.

2.

door unit

System with one out-

door unit

Grouping of units in a

3.

system with multiple

outdoor units

System with one out-

4.

5.

door unit

System with one out-

door unit

Connection to the system controller

NO

NO

NO

With connection to transmission line

for centralized control

With connection to indoor-outdoor

transmission line

Address start up for in-

door and outdoor units

Automatic

address setup

Manual

address setup

Manual

address setup

Manual

address setup

Manual

address setup

Notes

Connection of
multiple LOSS­NAY units

(2) An example of a system to which an M-NET remote controller is connected

System

configuration

System with one out-

1.

door unit

Connection to the system controller
With connection to transmission line

for centralized control

Address start up for indoor

and outdoor units

Manual

address setup

Notes

(3) An example of a system to which both MA remote controller and M-NET remote controller are co nn ected

System

configuration

System with one out-

1.

door unit

Connection to the system controller

With connection to transmission

line for centralized control

Address start up for in­door and outdoor units

Manual

address setup

Notes

HWE07010 GB

- 27 -

[ II Restrictions ]

[5] An Example of a System to which an MA Remote Controller is connected

1. System with one outdoor unit (automatic address setup for both indoor and outdoor units)

(1) Sample control wiring

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

00

TB3

TB7

M1 M2 M1 M2 M1 M2 M1M2 M1 M2 M1 M2

S

TB3

OS1OS2

TB7

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

S

TB3

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

OC

0000

TB7

L2L1

Group Group

IC

00

TB5STB

S

L3 L4

15

12

m1

IC

00

TB5STB

15

12

Interlock operation with
the ventilation unit

LC

00

TB5

M1M2M1M2M1M2

S

L11

m4

AB

MA

(2) Cautions

1) M-NET remote controller and MA remote controller can-

not both be connected to the same group of indoor units.

2) No more than 2 MA remote controllers can be connected

to a group of indoor units.

3) A transmission booster is required in a system to which

more than 32 indoor units (26 units if one or more indoor
units of the 200 model or above is connected) are con­nected.

4) Auto matic address setup is not available if start-stop in-

put (CN32, CN51, CN41) is used for a group operation of
indoor units. Refer to "[5] 2. Manual address setup for
both indoor and outdoor units".(page 30)

5) To connect more than 2 LOSSNAY units to indoor units

in the same system, refer to the next section "[5] 2. An
example of a system with one outdoor unit to which 2 or
more LOSSNAY units are connected".(page 30)

AB

MA

L12 L13

GroupGroup

IC

AB

RC

IC

AB

MA

0000

15

TB5

TB

M1M2 M1M2 M1M2

S 12

m5

MA

AB

MA

AB

TB5STB

15

12

AB

MA

m2

m3

(3) Maximum allowable length

1) Indoor/outdoor transmission line

2

Maximum distance (1.25mm

[AWG16] or larger)
L1 +L2+L3+L4 200m[656ft]
L1 +L2+L11+L12+L13 200m[656ft]

2) Transmission line for centralized control
No connection is required.

3) MA remote controller wiring
Maximum overall line length

(0.3 to 1.25mm

2

[AWG22 to 16])
m1 200m [656ft]
m2+m3 200m [656ft]
m4+m5 200m [656ft]

IC

00

TB5STB

15

12

HWE07010

- 28 -

GB

[ II Restrictions ]

(4) Wiring method

1) Indoor/outdoor transmission line
Daisy-chain terminals M1 and M2 on the terminal block

for indoor-outdoor transmission line (TB3) on the outdoor
units (OC, OS1, OS2) (Note 1), and terminals M1 and M2
on the terminal block for indoor-outdoor transmission line
(TB5) on each indoor unit (IC). (Non-polarized two-wire)

Only use shielded cables.

The outdoor units in the same refrigerant circuit are au­tomatically designated as OC, OS1, and OS2 in the or­der of capacity from large to small (if two or more units
have the same capacity, in the order of address from
small to large).

Shielded cable connection

Daisy-chain the ground terminal ( ) on the outdoor
units (OC, OS1, OS2), and the S terminal on the terminal
block (TB5) on the indoor unit (IC) with the shield wire of
the shielded cable.

2) Transmission line for centralized control
No connection is required.

3) MA remote controller wiring
Connect terminals 1 and 2 on the terminal block for MA

remote controller line (TB15) on the indoor unit (IC) to the
terminal block on the MA remote controller (MA). (Non­polarized 2-core cable)

When 2 remote controllers are connected to the sys­tem

When 2 remote controllers are connected to the system,
connect terminals 1 and 2 of the terminal block (TB15) on
the indoor unit (IC) to the terminal block on the two MA
remote controllers.

Set one of the MA remote controllers to sub. (Refer to

(5) Address setting method

MA remote controller function selection or the installation
manual for the MA remote controller for the setting meth­od.)

Group operation of indoor units

To perform a group operation of indoor units (IC), daisy­chain terminals 1 and 2 on the terminal block (TB15) on
all indoor units (IC) in the same group, and then connect
terminals 1 and 2 on the terminal block (TB15) on the in­door unit on one end to the terminal block on the MA re­mote controller. (Non-polarized 2-core cable)

When performing a group operation of indoor units that

have different functions, "Automatic indoor/outdoor ad­dress setup" is not available.

4) LOSSNAY connection
Connect terminals M1 and M2 on the terminal block

(TB5) on the indoor unit (IC) to the appropriate terminals
on the terminal block (TB5) on LOSSNAY (LC). (Non-po­larized 2-core cable)

Interlock operation setting with all the indoor units in the

same system will automatically be made. (It is required
that the Lossnay unit be turned on before the outdoor
unit.)

Refer to "[5] 2. Manual address setup for both indoor and

outdoor units" in the following cases: performing an inter­lock operation of part of the indoor units in the system
with a LOSSNAY unit, using LOSSNAY alone without in­terlocking it with any units, performing an interlock oper­ation of more than 16 indoor units with a LOSSNAY unit,
or connecting two or more LOSSNAY units to indoor
units in the same system.

5) Switch setting
No address settings required.

Proce-

dures

Unit or controller

1 Indoor unit Main unit IC No settings re-

Sub unit IC

Address setting

range

quired.

Setting

method

Notes

- To perform a group opera­tion of indoor units that
have different functions,
refer to [5] 2.(page 30)

2 LOSSNAY LC No settings re-

-00

quired.

3MA

remote con­troller

Main
remote con­troller

Sub
remote con­troller

MA No settings re-

quired.

MA Sub

remote controller

-Main

Settings to
be made ac­cording to
the remote
controller
function se­lection

4 Outdoor unit (Note) OC

OS1

No settings re­quired.

-00

OS2

The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.

Factory

setting

00

HWE07010 GB

29- 29 -

[ II Restrictions ]

2. An example of a system with one outdoor unit to which 2 or more LOSSNAY units are connected
(manual address setup for both indoor and outdoor units)

(1) Sample control wiring

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

53

TB3

TB7

M1 M2 M1 M2 M1 M2 M1 M2 M1 M2 M1 M2

L1

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

OCOS1OS2

5152

TB3

TB7

TB3

S

S

TB7

L2

IC

01

TB5STB

S

M1M2 M1M2 M1M2

L3 L4

GroupGroup

15

12

IC

02

TB5STB

15

12

TB5

Interlock operation with
the ventilation unit

LC

05

S

L11

(2) Cautions

1) M-NET remote controller and MA remote controller can­not both be connected to the same group of indoor units.

2) No more than 2 MA remote controllers can be connected
to a group of indoor units.

3) A transmission booster is required in a system to which
more than 32 indoor units (26 units if one or more indoor
units of the 200 model or above is connected) are con­nected.

AB

MA

L12 L13

Group

IC

AB

MA

IC

0403

TB5

S

15

TB

12

AB

MA

TB5STB

15

12

(3) Maximum allowable length

1) Indoor/outdoor transmission line
Same as [5] 1.

2) Transmission line for centralized control
No connection is required.

3) MA remote controller wiring
Same as [5] 1.

LC

06

TB5

S

M1M2M1M2M1M2

HWE07010

- 30 -

GB

[ II Restrictions ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as [5] 1.

Shielded cable connection

Same as [5] 1.

2) Transmission line for centralized control
No connection is required.

3) MA remote controller wiring
Same as [5] 1.

When 2 remote controllers are connected to the sys­tem

Same as [5] 1.

Group operation of indoor units

Same as [5] 1.

(5) Address setting method

Proce-

dures

Unit or controller

1 Indoor unit Main

IC 01 to 50 Assign the smallest ad-

Address

setting

unit

Sub unit Assign sequential numbers

range

4) LOSSNAY connection
Connect terminals M1 and M2 on the terminal block

(TB5) on the indoor unit (IC) to the appropriate terminals
on the terminal block (TB5) on LOSSNAY (LC). (Non-po­larized 2-core cable)

Interlock setting between the indoor units and LOSS-

NAY units must be entered on the remote controller. (Re­fer to "4 [3] Entering the Interlock Settings into the MA
Remote Controller" or the installation manual for the MA
remote controller for the setting method.)

5) Switch setting
Address setting is required as follows.

Setting method Notes

To perform a group opera­dress to the main unit in the
group.

tion of indoor units that

have different functions,

set the indoor unit in the
starting with the address of

the main unit in the same
group +1. (Main unit ad-

group with the greatest

number of functions as the

main unit.
dress +1, main unit ad-

dress +2, main unit
address +3, etc.)

Factory

setting

00

2 LOSSNAY LC 01 to 50 Assign an arbitrary but

unique address to each of
these units after assigning

None of these addresses

may overlap any of the in-

door unit addresses.
an address to all indoor
units.

3MA

remote con­troller

Main
remote
control-

MA No

settings re­quired.

-Main

ler
Sub

remote
control-

MA Sub

remote
controller

Settings to be made ac­cording to the remote con­troller function selection

ler

4 Outdoor unit OC

OS1
OS2

51 to 100 Assign sequential address

to the outdoor units in the
same refrigerant circuit.

To set the address to 100,

set it to 50.
The outdoor units are auto-

matically designated as
OC, OS1, and OS2.(Note)

The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.

00

00

HWE07010 GB

31- 31 -

[ II Restrictions ]

3. Group operation of units in a system with multiple outdoor units
(1) Sample control wiring

L11

CN41 CN40 Replace

SW2-1 OFF

Not
connect

OC

51

TB3

TB7

Group

IC

01

15

TB5 S TB

1 2

M1 M2 M1 M2 M1 M2 M1 M2

S

Connect

A B

Not
connect

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

OS1

52

TB3

TB7

S

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

OS2

53

TB3

M1 M2 M1 M2 M1 M2

TB7

M1 M2 M1 M2 M1 M2

S

m2

L12

Group

IC

03

TB5 S TB

15

1 2

A B

Interlock operation with
the ventilation unit

Group

IC

06

15

TB5 S TB

1 2

A B

TB5

LC

07

S

L31

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

OS2

56

TB3

M1 M2 M1 M2 M1 M2

TB7

M1 M2 M1 M2 M1 M2

S

Not
connect

L21

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

55

TB3

TB7

OS1

Leave the male
connector on
CN41 as it is.

SW2-1 OFF

OC

54

Not
connect

TB5

M1 M2

TB3

TB7

S

Not
connect

S

(2) Cautions

1) M-NET remote controller and MA remote controller can­not both be connected to the same group of indoor units.

2) No more than 2 MA remote controllers can be connected
to a group of indoor units.

3) Do not connect the terminal blocks (TB5) on the indoor
units that are connected to different outdoor units with
each other.

4) Replacement of male power jumper connector (CN41)
must be performed only on one of the outdoor units.

5) Provide grounding to S terminal on the terminal block for
transmission line for centralized control (TB7) on only
one of the outdoor units.

6) A transmission booster is required in a system to which
more than 32 indoor units (26 units if one or more indoor
units of the 200 model or above is connected) are con­nected.

MA

m3

L22

IC

15

TB

S

1 2

Group

MA

IC

04 02

TB5 S TB

15

1 2 1 2

A B

MA

MA

IC

05

TB5 TB15

S

M1 M2 M1 M2

(3) Maximum allowable length

1) Indoor/outdoor transmission line

2

Maximum distance (1.25mm

[AWG16] or larger)
L11+L12 200m [656ft]
L21+L22 200m [656ft]

2) Transmission line for centralized control
Maximum line distance via outdoor unit

(1.25mm

2

[AWG16] or larger)

L12+L31+L22 500m [1640ft]
L11+L31+L21 500m [1640ft]

3) MA remote controller wiring
Same as [5] 1.

HWE07010

- 32 -

GB

[ II Restrictions ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as [5] 1.

Only use shielded cables.

Shielded cable connection

Same as [5] 1.

2) Transmission line for centralized control
Daisy-chain terminals M1 and M2 on the terminal block

for transmission line for centralized control (TB7) on the
outdoor units (OC) in different refrigerant circuits and on
the OC, OS1, and OS2 in the same refrigerant circuit
If a power supply unit is not connected to the transmis­sion line for centralized control, replace the power jump­er connector on the control board from CN41 to CN40 on
only one of the outdoor units.

The outdoor units in the same refrigerant circuit are au­tomatically designated as OC, OS1, and OS2 in the or­der of capacity from large to small (if two or more units
have the same capacity, in the order of address from
small to large).

(5) Address setting method

Proce-

dures

Unit or controller

Address setting

range

Only use shielded cables.

Shielded cable connection

Daisy-chain the S terminal on the terminal block (TB7) on
the outdoor units (OC, OS1, OS2) with the shield wire of
the shielded cable. Short-circuit the earth terminal ( )
and the S terminal on the terminal block (TB7) on the out­door unit whose power jumper connector is mated with
CN40.

3) MA remote controller wiring
Same as [5] 1.

When 2 remote controllers are connected to the sys­tem

Same as [5] 1.

Group operation of indoor units

Same as [5] 2.

4) LOSSNAY connection
Same as [5] 2.

5) Switch setting
Address setting is required as follows.

Setting method Notes

Factory

setting

1 Indoor

unit

Main unit IC 01 to 50 Assign the smallest ad-

dress to the main unit in
the group.

Sub unit Assign sequential num-

bers starting with the ad­dress of the main unit in
the same group +1. (Main
unit address +1, main unit
address +2, main unit ad­dress +3, etc.)

2 LOSSNAY LC 01 to 50 Assign an arbitrary but

unique address to each of
these units after assigning
an address to all indoor
units.

3MA

re­mote
con­troller

Main
remote
controller

Sub
remote
controller

4 Outdoor unit OC

MA No

settings required.

MA Sub

remote controller

51 to 100 Assign sequential address
OS1
OS2

-Main

Settings to be made ac­cording to the remote con­troller function selection

to the outdoor units in the
same refrigerant circuit.
The outdoor units are au­tomatically designated as
OC, OS1, and OS2.
(Note)

To perform a group
operation of indoor
units that have differ­ent functions, desig­nate the indoor unit in
the group with the
greatest number of
functions as the main
unit.

None of these ad­dresses may overlap
any of the indoor unit
addresses.

To set the address to
100, set it to 50.

00

00

00

The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.

HWE07010 GB

33- 33 -

[ II Restrictions ]

4. A system in which a system controller is connected to the transmission line for centralized control and which is pow­ered from an outdoor unit

(1) Sample control wiring

Interlock operation with

15

1 2

the ventilation unit

IC

03

TB5 S TB

1 2

LC

07

TB5

15

S

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS2

53

TB3

M1 M2 M1 M2 M1 M2

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS1

52

TB3

CN41 CN40 Replace

SW2-1 OFF ON

OC

51

TB3

L12 L11

Group Group Group

IC

01

15

TB5 S TB

1 2

M1 M2 M1 M2 M1 M2 M1 M2

IC

02

TB5 S TB

L31

TB7

S

M1 M2 M1 M2 M1 M2

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS2

Not
connect

56

TB3

M1 M2 M1 M2 M1 M2

TB7

M1 M2 M1 M2 M1 M2

S

Not
connect

TB7

S

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS1

55

TB3

TB7

S

Not
connect

Not
connect

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

TB7

S

Connect

OC

54

TB3

TB7

S

Not
connect

System controller

A B S

L32

TB5

Note1

A B

MA

L22 L21

IC

15

TB

S

1 2

A B

MA

TB5 S TB

m2 m1

m3

Note1 When only the LM adapter is connected,
leave SW2-1 to OFF (as it is).
Note2 LM adapters require the power supply
capacity of single-phase AC 208/230V.

A B

MA

IC

Group Group

05 04

15

1 2

IC

06

TB5 S TB

15

1 2

A B

MA

A B

MA

M1 M2 M1 M2 M1 M2 M1 M2

TB5

LC

08

S

(2) Cautions

1) M-NET remote controller and MA remote controller can­not both be connected to the same group of indoor units.

2) No more than 2 MA remote controllers can be connected
to a group of indoor units.

3) Do not connect the terminal blocks (TB5) on the indoor
units that are connected to different outdoor units with
each other.

4) Replacement of male power jumper connector (CN41)
must be performed only on one of the outdoor units.

5) Short-circuit the shield terminal (S terminal) and the
earth terminal ( ) on the terminal block for transmission
line for centralized control (TB7) on the outdoor unit
whose power jumper connector is mated with CN40.

6) A transmission booster is required in a system to which
more than 32 indoor units (26 units if one or more indoor
units of the 200 model or above is connected) are con­nected.

7) When a power supply unit is connected to the transmis­sion line for centralized control, leave the power jumper
connector on CN41 as it is (factory setting).

HWE07010

(3) Maximum allowable length

1) Indoor/outdoor transmission line
Same as [5] 3.

2) Transmission line for centralized control
Maximum line distance via outdoor unit

(1.25mm

2

[AWG16] or larger)
L32+L31+L12(L11) 500m [1640ft]
L32+L22(L21) 500m [1640ft]
L12(L11)+L31+L22(L21) 500m[1640ft]

3) MA remote controller wiring
Same as [5] 1.

- 34 -

GB

[ II Restrictions ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as [5] 1.
Only use shielded cables.

Shielded cable connection

Same as [5] 1.

2) Transmission line for centralized control
Daisy-chain terminals A and B on the system controller,

terminals M1 and M2 on the terminal block for transmis­sion line for centralized control (TB7) on the outdoor
units (OC) in different refrigerant circuits and on the out­door units (OC, OS1, and OS2) in the same refrigerant
circuit.
If a power supply unit is not connected to the transmis­sion line for centralized control, replace the power jump­er connector on the control board from CN41 to CN40 on
only one of the outdoor units.
If a system controller is connected, set the central control
switch (SW2-1) on the control board of all outdoor units
to "ON."

The outdoor units in the same refrigerant circuit are au­tomatically designated as OC, OS1, and OS2 in the or­der of capacity from large to small (if two or more units
have the same capacity, in the order of address from
small to large).

Only use shielded cables.

(5) Address setting method

Shielded cable connection

Daisy-chain the S terminal on the terminal block (TB7) on
the outdoor units (OC, OS1, OS2) with the shield wire of
the shielded cable. Short-circuit the earth terminal ( )
and the S terminal on the terminal block (TB7) on the out­door unit whose power jumper connector is mated with
CN40.

3) MA remote controller wiring
Same as [5] 1.

When 2 remote controllers are connected to the sys­tem

Same as [5] 1.

Group operation of indoor units

Same as [5] 1.

4) LOSSNAY connection
Connect terminals M1 and M2 on the terminal block

(TB5) on the indoor unit (IC) to the appropriate terminals
on the terminal block for indoor-outdoor transmission line
(TB5) on LOSSNAY (LC). (Non-polarized 2-core cable)

Indoor units must be interlocked with the LOSSNAY unit

using the system controller. (Refer to the operation man­ual for the system controller for the setting method.) In­terlock setting from the remote controller is required if the
ON/OFF remote controller alone or the LM adapter alone
is connected.

5) Switch setting
Address setting is required as follows.

Proce-

dures

Unit or controller

Address

setting

range

Setting method Notes

1 Indoor unit Main unit IC 01 to 50 Assign the smallest ad-

dress to the main unit in
the group.

Sub unit Assign sequential num-

bers starting with the ad­dress of the main unit in
the same group +1. (Main
unit address +1, main unit
address +2, main unit ad­dress +3, etc.)

2 LOSSNAY LC 01 to 50 Assign an arbitrary but

unique address to each of
these units after assign­ing an address to all in­door units.

3MA

remote con­troller

Main
remote
control-

MA No

settings re­quired.

- Enter the same indoor

ler
Sub

remote
control­ler

4 Outdoor unit OC

MA Sub

remote con­troller

51 to 100 Assign sequential ad­OS1
OS2

Settings to be made ac­cording to the remote
controller function selec­tion

dress to the outdoor units
in the same refrigerant
circuit.
The outdoor units are au­tomatically designated as
OC, OS1, and
OS2.(Note)

To perform a group oper­ation of indoor units that
have different functions,
designate the indoor unit
in the group with the
greatest number of func­tions as the main unit.

None of these addresses
may overlap any of the in­door unit addresses.

unit group settings on the
system controller as the
ones that were entered
on the MA remote con­troller.

To set the address to
100, set it to 50.

Factory

setting

00

00

Main

00

The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.

HWE07010 GB

35- 35 -

[ II Restrictions ]

5. An example of a system in which a system controller is connected to the indoor-outdoor transmission line (except
LM adapter)

(1) Sample control wiring

Interlock operation with

15

1 2

the ventilation unit

IC

03

TB5 S TB

15

1 2

TB5

LC

07

S

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS2

53

TB3

M1 M2 M1 M2 M1 M2

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS1

52

TB3

CN41 CN40 Replace

SW2-1 OFF ON

OC

51

TB3

L12 L11

Group Group Group

IC

01

15

TB5 S TB

M1 M2 M1 M2 M1 M2 M1 M2

1 2

IC

02

TB5 S TB

L31

TB7

S

M1 M2 M1 M2 M1 M2

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS2

Not
connect

56

TB3

M1 M2 M1 M2 M1 M2

TB7

M1 M2 M1 M2 M1 M2

S

Not
connect

TB7

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS1

55

TB3

TB7

S

Not
connect

S

Not
connect

TB7

S

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OC

54

TB3

TB7

S

Not
connect

Connect

L25

System controller

TB5

A B S

A B

MA

L22 L21

IC

05 04

m2 m1

m3

TB5 S TB

M1 M2 M1 M2

15

TB

S

1 2

A B

MA

Note1

A B

MA

IC

15

1 2

Group Group

M1 M2

IC

06

TB5 S TB

15

1 2

A B

MA

A B

MA

TB5

M1 M2

LC

08

S

Note1 LM adapters cannot be connected to the
indoor-outdoor transmission line.

(2) Cautions

1) M-NET remote controller and MA remote controller can­not both be connected to the same group of indoor units.

2) No more than 2 MA remote controllers can be connected
to a group of indoor units.

3) Do not connect the terminal blocks (TB5) on the indoor
units that are connected to different outdoor units with
each other.

4) Replacement of male power jumper connector (CN41)
must be performed only on one of the outdoor units.

5) Provide grounding to S terminal on the terminal block for
transmission line for centralized control (TB7) on only
one of the outdoor units.

6) A maximum of 3 system controllers can be connected to
the indoor-outdoor transmission line, with the exception
that only one G(B)-50A may be connected.

7) When the total number of indoor units exceeds 26, it may
not be possible to connect a system controller on the in­door-outdoor transmission line.

8) In a system to which more than 18 indoor units including
one or more indoor units of 200 model or above are con­nected, there may be cases in which the system control­ler cannot be connected to the indoor-outdoor
transmission line.

HWE07010

(3) Maximum allowable length

1) Indoor/outdoor transmission line
Maximum distance (1.25mm

L11+L12 200m [656ft]
L21+L22 200m [656ft]
L25 200m [656ft]

2) Transmission line for centralized control
Maximum line distance via outdoor unit

(1.25mm2 [AWG16] or larger)
L25+L31+L12(L11) 500m [1640ft]
L12(L11)+L31+L22(L21) 500m [1640ft]

3) MA remote controller wiring
Same as [5] 1.

- 36 -

2

[AWG16] or larger)

GB

[ II Restrictions ]

(4) Wiring method

1) Indoor/outdoor transmission line
Daisy-chain terminals M1 and M2 on the terminal block

for indoor-outdoor transmission line (TB3) on the outdoor
units (OC, OS1, OS2) (Note 1), terminals M1 and M2 on
the terminal block for indoor-outdoor transmission line
(TB5) on each indoor unit (IC), and the S terminal on the
system controller. (Non-polarized two-wire)

Only use shielded cables.

The outdoor units in the same refrigerant circuit are au­tomatically designated as OC, OS1, and OS2 in the or­der of capacity from large to small (if two or more units
have the same capacity, in the order of address from
small to large).

Shielded cable connection

Daisy-chain the ground terminal ( ) on the outdoor
units (OC, OS1, OS2), the S terminal on the terminal
block (TB5) on the indoor unit (IC), and the S terminal on
the system controller with the shield wire of the shielded
cable.

2) Transmission line for centralized control
Daisy-chain terminals M1 and M2 on the terminal block

for transmission line for centralized control (TB7) on the
outdoor units (OC) in different refrigerant circuits and on
the OC, OS1, and OS2 in the same refrigerant circuit.
If a power supply unit is not connected to the transmis­sion line for centralized control, replace the power jump­er connector on the control board from CN41 to CN40 on
only one of the outdoor units.

(5) Address setting method

Set the central control switch (SW2-1) on the control
board of all outdoor units to "ON."

Only use shielded cables.

Shielded cable connection

Daisy-chain the S terminal on the terminal block (TB7) on
the outdoor units (OC, OS1, OS2) with the shield wire of
the shielded cable. Short-circuit the earth terminal ( )
and the S terminal on the terminal block (TB7) on the out­door unit whose power jumper connector is mated with
CN40.

3) MA remote controller wiring
Same as [5] 1.

When 2 remote controllers are connected to the sys­tem

Same as [5] 1.

Group operation of indoor units

Same as [5] 1.

4) LOSSNAY connection
Connect terminals M1 and M2 on the terminal block

(TB5) on the indoor units (IC) to the appropriate termi­nals on the terminal block for indoor-outdoor transmis­sion line (TB5) on LOSSNAY (LC). (Non-polarized 2­core cable)

Indoor units must be interlocked with the LOSSNAY unit

using the system controller. (Refer to the operation man­ual for the system controller for the setting method.) In­terlock setting from the remote controller is required if the
ON/OFF remote controller alone is connected.

5) Switch setting
Address setting is required as follows.

Proce-

dures

1 Indoor

Unit or controller

Main unit IC 01 to 50 Assign the smallest address

unit

Address set-

ting range

Setting method Notes

to the main unit in the group.

Sub unit Assign sequential numbers

starting with the address of
the main unit in the same
group +1. (Main unit address
+1, main unit address +2,
main unit address +3, etc.)

2 LOSSNAY LC 01 to 50 Assign an arbitrary but

unique address to each of
these units after assigni ng an
address to all indoor units.

3MA

remote
control­ler

4 Outdoor unit OC

Main
remote
controller

Sub
remote
controller

MA No

settings re­quired.

MA Sub

remote con­troller

Settings to be made accord­ing to the remote controller
function selection

51 to 100 Assign sequential address to
OS1
OS2

the outdoor units in the same
refrigerant circuit.

- Enter the same indoor unit

The outdoor units are auto­matically designated as OC,
OS1, and OS2. (Note)

To perform a group opera­tion of indoor units that have
different functions, desig­nate the indoor unit in the
group with the greatest
number of functions as the
main unit.

None of these addresses
may overlap any of the in­door unit addresses.

group settings on the sys­tem controller as the ones
that were entered on the MA
remote controller.

To set the address to 100,
set it to 50.

Factory

setting

00

00

Main

00

The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.

HWE07010 GB

37- 37 -

[ II Restrictions ]

[6] An Example of a System to which an M-NET Remote Controller is connected

(1) Sample control wiring

Interlock operation with

15

1 2

the ventilation unit

Group Group Group

IC

03

TB5 S TB

15

1 2

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS2

53

TB3

M1 M2 M1 M2 M1 M2

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS1

52

TB3

CN41 CN40 Replace

SW2-1 OFF ON

OC

51

TB3

L12 L11

IC

01

TB5 S TB

15

M1 M2 M1 M2 M1 M2 M1 M2

1 2

IC

02

TB5 S TB

TB5

LC

07

S

L31

TB7

S

M1 M2 M1 M2 M1 M2

Not
connect

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS2

56

TB3

M1 M2 M1 M2 M1 M2

TB7

M1 M2 M1 M2 M1 M2

S

Not
connect

TB7

S

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS1

55

TB3

TB7

S

Not
connect

Not
connect

TB7

S

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OC

54

TB3

TB7

S

Not
connect

System controller

A B S

Connect

L32

A B

101

RC

Group

m3

A B

154

Note1

RC

m1

A B

102

RC

L22 L21

IC

IC

Group

05 04

TB5

15

TB

1 2

S

m2

A B

104

RC

Note1 When only the LM adapter is connected,
leave SW2-1 to OFF (as it is).
Note2 LM adapters require the power supply
capacity of single-phase AC 208/230V.

TB5 S TB

15

1 2

A B

103

RC

TB5 S TB

A B

106

RC

IC

06

15

1 2

LC

08

TB5

M1 M2 M1 M2 M1 M2 M1 M2

S

(2) Cautions

1) M-NET remote controller and MA remote controller can­not both be connected to the same group of indoor units.

2) No more than 3 M-NET remote controllers can be con­nected to a group of indoor units.

3) Do not connect the terminal blocks (TB5) on the indoor
units that are connected to different outdoor units with
each other.

4) Replace the power jumper connector of the control board
from CN41 to CN40 on only one of the outdoor units.

5) Provide an electrical path to ground for the S terminal on
the terminal block for centralized control on only one of
the outdoor units.

6) A transmission booster must be connected to a system
in which the total number of connected indoor units ex­ceeds 20.

7) A transmission booster is required in a system to which
more than 16 indoor including one or more indoor units
of the 200 model or above are connected.

8) When a power supply unit is connected to the transmis­sion line for centralized control, leave the power jumper
connector on CN41 as it is (factory setting).

(3) Maximum allowable length

1) Indoor/outdoor transmission line
Same as [5] 3.

2) Transmission line for centralized control
Same as [5] 4.

3) M-NET remote controller wiring
Maximum overall line length

(0.3 to 1.25mm

2

[AWG22 to 16])
m1 10m [32ft]
m2+m3 10m [32ft]
If the standard-supplied cable must be extended, use a
cable with a diameter of 1.25mm

2

[AWG16]. The section
of the cable that exceeds 10m [32ft] must be included in
the maximum indoor-outdoor transmission line distance
described in (1).
When connected to the terminal block on the Simple re­mote controller, use cables that meet the following cable
size specifications: 0.75 - 1.25 mm

2

[AWG18-14].

HWE07010

- 38 -

GB

[ II Restrictions ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as [5] 3.

Shielded cable connection

Same as [5] 1.

2) Transmission line for centralized control
Same as [5] 4.

Shielded cable connection

Same as [5] 4.

3) M-NET remote controller wiring
M-NET remote controller is connectable anywhere on

the indoor-outdoor transmission line.

(5) Address setting method

Proce-

dures

1 Indoor

Unit or controller

Main unit IC 01 to 50 Assig n the smallest ad-

unit

Sub unit Assign sequential num-

2 LOSSNAY LC 01 to 50 Assig n an arbitrary but

3M-NET

remote
controller

Main
remote
controller

Sub

RC 101 to 150 Add 100 to the main unit

RC 151 to 200 Add 150 to the main unit
remote
controller

Address setting

range

When 2 remote controllers are connected to the sys­tem

Refer to the section on Switch Setting.

Performing a group operation (including the group
operation of units in different refrigerant circuits).

Refer to the section on Switch Setting.

4) LOSSNAY connection
Same as [5] 4.

5) Switch setting
Address setting is required as follows.

Setting method Notes

To perform a group
dress to the main unit in
the group.

operation of indoor

units that have differ-

ent functions, desig­bers starting with the ad-

dress of the main unit in
the same group +1.
(Main unit address +1,
main unit address +2,

nate the indoor unit in

the group with the

greatest number of

functions as the main

unit.
main unit address +3,

etc.)

None of these ad­unique address to each
of these units after as­signing an address to all

dresses may overlap

any of the indoor unit

addresses.
indoor units.

It is not necessary to

address in the group

set the 100s digit.

To set the address

to 200, set it to 00.

address in the group

Factory

setting

00

00

101

4 Outdoor unit OC

51 to 100 Assign sequential ad­OS1
OS2

dress to the outdoor
units in the same refrig-

To set the address to
100, set it to 50.

erant circuit. The out­door units are
automatically designat­ed as OC, OS1, and
OS2. (Note)

The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.

00

HWE07010 GB

39- 39 -

[ II Restrictions ]

[7] An Example of a System to which both MA Remote Controller and M-NET Remote Controller are connected

(1) Sample control wiring

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

TB3

M1 M2 M1 M2 M1 M2

L11 L12

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

TB3

CN41 CN40 Replace

SW2-1 OFF ON

OC OS1 OS2

51 52 53

TB3

Group Group

IC

01

TB5 TB

M1 M2

S

1 2

15

TB5 TB

M1 M2

S

02

IC

IC

06

15

1 2

TB5 TB

M1 M2

15

1 2

S

L31

TB7

M1 M2 M1 M2 M1 M2

S

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

OS2

56

TB3

M1 M2 M1 M2 M1 M2

TB7

S

M1 M2 M1 M2 M1 M2

TB7

S

Not
connect

Not
connect

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

Not
connect

L21 L22

OS1

55

TB3

TB7

S

Not
connect

Leave the male
connector on
CN41 as it is.

SW2-1 OFF ON

TB7

S

OC

54

TB3

TB7

S

Not
connect

System controller

A B S

Connect

L32

Note1

TB5

M1 M2

S

IC

A B

MA

15

TB

1 2

A B

MA

A B

106

RC

Group Group

IC

04 03

15

TB5 TB

M1 M2

S

1 2

A B

104

RC

Note1 When only the LM adapter is connected,
leave SW2-1 to OFF (as it is).

Note2 LM adapters require the power supply
capacity of single-phase AC 208/230V.

05

TB5 TB

M1 M2

S

IC

15

1 2

(2) Cautions

1) Be sure to connect a system controller.

2) M-NET remote controller and MA remote controller can­not both be connected to the same group of indoor units.

3) Assign to the indoor units connected to the MA remote
controller addresses that are smaller than those of the in­door units that are connected to the M-NET remote con­troller.

4) No more than 2 M-NET remote controllers can be con­nected to a group of indoor units.

5) No more than 2 MA remote controllers can be connected
to a group of indoor units.

6) Do not connect the terminal blocks (TB5) on the indoor
units that are connected to different outdoor units with
each other.

7) Replace the power jumper connector of the control board
from CN41 to CN40 on only one of the outdoor units.

8) Provide an electrical path to ground for the S terminal on
the terminal block for centralized control on only one of
the outdoor units.

9) A transmission booster must be connected to a system
in which the total number of connected indoor units ex­ceeds 20.

10) A transmission booster is required in a system to which
more than 16 indoor including one or more indoor units
of the 200 model or above are connected.

11) When a power supply unit is connected to the transmis­sion line for centralized control, leave the power jumper
connector on CN41 as it is (factory setting).

(3) Maximum allowable length

1) Indoor/outdoor transmission line
Same as [5] 3.

2) Transmission line for centralized control
Same as [5] 4.

3) MA remote controller wiring
Same as [5] 1.

4) M-NET remote controller wiring
Same as [5] 1.

HWE07010

- 40 -

GB

[ II Restrictions ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as [5] 3.

Shielded cable connection

Same as [5] 1.

2) Transmission line for centralized control
Same as [5] 4.

Shielded cable connection

Same as [5] 4.

3) MA remote controller wiring
Same as [5] 1.

When 2 remote controllers are connected to the sys­tem

(5) Address setting method

Proce-

dures

1Opera-

tion
with the
MA re-

Unit or controller

In-

Main unit IC 01 to 50
door
unit

Sub unit

mote
control­ler

MA
re­mote
con­troller

Main re-

mote con-

troller

Sub

remote

MA No

MA Sub

controller

2Opera-

tion
with the

In­door
unit

M-NET
remote

Main unit IC 01 to 50 Assign the smallest ad-

Sub unit

control­ler

M­NET
re­mote
con­troller

Main re-

mote con-

troller

Sub

remote

controller

RC 101 to

RC 151 to

3 LOSSNAY LC 01 to 50

4 Outdoor unit OC

OS1
OS2

Address

setting

range

settings
required.

remote
controller

150

200

51 to 100

Same as [5] 1.

Group operation of indoor units

Same as [5] 1.

4) M-NET remote controller wiring
Same as [5] 1.

When 2 remote controllers are connected to the sys­tem

Same as [5] 1.

Group operation of indoor units

Same as [5] 1.

5) LOSSNAY connection
Same as [5] 4.

6) Switch setting
Address setting is required as follows.

Setting method Notes

Assign the smallest address
to the main unit in the group.

Assign sequential num­bers starting with the ad­dress of the main unit in
the same group +1. (Main
unit address +1, main unit
address +2, main unit ad­dress +3, etc.)

-

Settings to be made ac­cording to the remote
controller function selec­tion

dress to the main unit in
the group.

Assign sequential num­bers starting with the ad­dress of the main unit in
the same group +1. (Main
unit address +1, main unit
address +2, main unit ad­dress +3, etc.)

Add 100 to the main unit
address in the group.

Assign an address smaller

than that of the indoor unit that
is connected to the M-NET re­mote controller.

Enter the same indoor unit

group settings on the system
controller as the ones that
were entered on the MA re­mote controller.

To perform a group operation

of indoor units that have differ­ent functions, designate the
indoor unit in the group with
the greatest number of

Enter the indoor unit group set-

tings on the system controller
(MELANS).

Assign an address larger than

those of the indoor units that
are connected to the MA re­mote controller.

To perform a group operation

of indoor units that have differ­ent functions, designate the
indoor unit in the group with
the greatest number of func­tions as the main unit.

It is not necessary to set

the 100s digit.

To set the address to 200,

set it to 00.

Add 150 to the main unit
address in the group.

Assign an arbitrary but
unique address to each of
these units after assign­ing an address to all in­door units.

Assign sequential ad­dress to the outdoor units
in the same refrigerantcir­cuit. The outdoor units
are automatically desig­nated as OC, OS1, and
OS2.(Note)

None of these addresses
may overlap any of the in­door unit addresses.

To set the address to 100,
set it to 50.

Factory

setting

00

Main

00

101

00

00

The outdoor units in the same refrigerant circuit are automatically designated as OC, OS1, and OS2.

HWE07010 GB

41- 41 -

[ II Restrictions ]

[8] Restrictions on Pipe Length

(1) End branching

P200 - P450 models

Outdoor unit

A

D

First branch
(Branch joint)

B

Branch joint

(Outdoor unit above indoor unit)

(Outdoor unit below indoor unit)

'
H

H

1

C

a

Indoor Indoor Indoor

2

L

d

Indoor Indoor Indoor

b

c

3

4

Operation Pipe sections

Length Total pipe length A+B+C+D

+a+b+c+d+e+f

Height
difference

Total pipe length (L) from the outdoor unit to the
farthest indoor unit

Total pipe length from the first branch to the far­thest indoor unit ( )

Between indoor and
outdoor units

Outdoor unit above in­door unit

Outdoor unit below in-

A+B+C+c or

A+D+f

B+C+c or

D+f

H 50 [164] or less

H' 40 [131] or less

door unit

Between indoor units h 15 [49] or less

Branch header

cap

e

5

f

6

h

Allowable length of

pipes

1000 [3280] or less

165 [541] or less

(Equivalent length 190

[623] or less)

40 [131] or less

Unit: m [ft]

HWE07010 GB

- 42 -

[ II Restrictions ]

P500 - P1250 models

Provide a trap on the pipe (gas pipe only) within 2 m from the
joint pipe if the total length of the pipe that connects the joint
pipe and the outdoor unit exceeds 2 m.

To indoor unit

2m

E

Note : "Total sum of downstream unit model numbers"
in the table is the sum of the model numbers
of the units after point E in the figure.

Joint pipe

Trap
(gas pipe
only)

2m Max.

To downstream units

To indoor unit
Joint pipe

Allowable length of

pipes

h2

B D A

C

Second gas refrigerant distributor
Second liquid refrigerant distributor

First liquid refrigerant distributor
First gas refrigerant distributor

H

First branch

h1

Note1 Install the pipe that connects the branch pipe and the outdoor units in

the way that it has a downward inclination toward the branch pipe.

Downward inclination

Upward inclination

L

To indoor unit

To indoor unit

(Note)

E F G I

a

Indoor Indoor Indoor Indoor

1

J K M

e

Indoor Indoor Indoor Indoor

5

b

2

f

6

c

3

g

7

d

4

i

8

Operation Pipe sections

Length Between outdoor units A+B+C+D 10 [32] or less

Unit: m [ft]

Height
difference

Total pipe length A+B+C+D+E+F+G+I+J

1000 [3280] or less

+K+M+a+b+c+d+e+f+g

+i

Total pipe length (L) from the outdoor unit to the
farthest indoor unit

Total pipe length from the first branch to the far-

A(B)+C+E+J+K+M+i

G+I+J+i 40 [131] or less

165 [541] or less

(Equivalent length 190

[623] or less)

thest indoor unit ( )

Between indoor and outdoor units H 50 [164] or less

(40 [131] or below if

outdoor unit is below in-

door unit)

Between indoor units h1 15 [49] or less

Between outdoor units h2 0.1[0.3] or less

HWE07010 GB

- 43 -

[ II Restrictions ]

1. Refrigerant pipe size
(1) Diameter of the refrigerant pipe between the outdoor unit and the first branch (outdoor unit pipe size)

Outdoor unit set name

Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch]

(total capacity)
200 model ø9.52 [3/8"] ø19.05 [3/4"]
250 model ø9.52 [3/8"]
300 model ø9.52 [3/8"]

*1
*2

ø22.2 [7/8"]

ø22.2 [7/8"]
350 model ø12.7 [1/2"] ø28.58 [1-1/8"]
400 model ø12.7 [1/2"] ø28.58 [1-1/8"]
450 model ø15.88 [5/8"] ø28.58 [1-1/8"]
500 model ø15.88 [5/8"] ø28.58 [1-1/8"]
550 model ø15.88 [5/8"] ø28.58 [1-1/8"]
600 model ø15.88 [5/8"] ø28.58 [1-1/8"]
650 model ø15.88 [5/8"] ø28.58 [1-1/8"]
700 - 800 model ø19.05 [3/4"] ø34.93 [1-3/8"]
850 - 1250 model ø19.05 [3/4"] ø41.28 [1-5/8"]

*1. Use ø12.7 [1/2"] pipes if the piping length exceeds 90 m [295 ft].
*2. Use ø12.7 [1/2"] pipes if the piping length exceeds 40 m [131 ft].

(2) Size of the refrigerant pipe between the first branch and the indoor unit (indoor unit pipe size)

model Pipe diameter (mm) [inch]
20 - 50 models Liquid pipe ø6.35 [1/4"]

Gas pipe ø12.7 [1/2"]

63 - 140 models Liquid pipe ø9.52 [3/8"]

Gas pipe ø15.88 [5/8"]

200 model Liquid pipe ø9.52 [3/8"]

Gas pipe ø19.05 [3/4"]

250 model Liquid pipe ø9.52 [3/8"]

Gas pipe ø22.2 [7/8"]

400 model Liquid pipe ø12.7 [1/2"]

Gas pipe ø28.58 [1-1/8"]

500 model Liquid pipe ø15.88 [5/8"]

Gas pipe ø28.58 [1-1/8"]

(3) Size of the refrigerant pipe between the branches for connection to in door units

Total capacity of the

Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch]

downstream units

- 140 ø9.52 [3/8"] ø15.88 [5/8"]
P141 - P200 ø9.52 [3/8"] ø19.05 [3/4"]
P201 - P300 ø9.52 [3/8"] ø22.2 [7/8"]
P301 - P400 ø12.7 [1/2"] ø28.58 [1-1/8"]
P401 - P650 ø15.88 [5/8"] ø28.58 [1-1/8"]
P651 - P800 ø19.05 [3/4"] ø34.93 [1-3/8"]
P801 - ø19.05 [3/4"] ø41.28 [1-5/8"]

HWE07010 GB

- 44 -

[ II Restrictions ]

(4) Size of the refrigerant pipe between the first distributor and the second distributor

Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch]
ø19.05 [3/4"] ø34.93 [1-3/8"]

(5) Size of the refrigerant pipe between the first distributor or the second distributor and outdoor units

Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch]
250 model ø9.52 [3/8"] ø22.2 [7/8"]
300 model ø12.7 [1/2"]
350 model ø28.58 [1-1/8"]
400 model ø15.88 [5/8"]
450 model

* Only applicable to the 500 model and below

HWE07010 GB

- 45 -

- 46 -

III Outdoor Unit Components

[1] Outdoor Unit Components and Refrigerant Circuit .......................................................... 49

[2] Control Box of the Outdoor Unit....................................................................................... 51

[3] Outdoor Unit Circuit Board............................................................................................... 52

HWE07010 GB

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- 48 -

[ III Outdoor Unit Components ]

III Outdoor Unit Components

[1] Outdoor Unit Components and Refrigerant Circuit

1. PUHY-P200, P250, P300, P350, P400, P450YHM-A, PUHY-EP200, EP300YHM-A
(1) Front view of a outdoor unit

Fan guard

Fan

Heat exchanger

Control
Box

Front panel

Fin guard

HWE07010 GB

- 49 -

[ III Outdoor Unit Components ]

2. PUHY-P200, P250, P300YHM-A, PUHY-EP200YHM-A
(1) Refrigerant circuit

Check valve

4-way valve(21S4b)

4-way valve(21S4a)

High pressure check joint

Low pressure check joint

Subcool coil

Linear Expansion

Valve(LEV1)

Solenoid valve(SV5b)

Linear Expansion Valve(LEV2a,2b)

Low pressure sensor(63LS)

Liquid side valve

Solenoid valve (SV1a)

Solenoid valve (SV9)

Gas side valve

High pressure sensor(63HS1)

High-pressure switch(63H1)

Accumulator

Compressor cover

Compressor

Oil separator

3. PUHY-P350, P400, P450YHM-A, PUHY-EP300YHM-A
(1) Refrigerant circuit

4-way valve(21S4b)

4-way valve(21S4a)

4-way valve(21S4c)

Solenoid valve(SV5c)

Linear Expansion

Valve(LEV1)

Solenoid valve(SV5b)

Linear Expansion Valve(LEV2a,2b)

Liquid side valve

Gas side valve

Subcool coil

Solenoid valve (SV9)

Low pressure sensor(63LS)

Check valve

Solenoid valve (SV1a)

High pressure check joint

Low pressure check joint

High pressure sensor(63HS1)

High-pressure switch(63H1)

Accumulator

Compressor cover

Compressor

Oil separator

HWE07010 GB

- 50 -

[ III Outdoor Unit Components ]

[2] Control Box of the Outdoor Unit

<HIGH VOLTAGE WARNING>

Control box houses high-voltage parts.
When opening or closing the front panel of the control box, do not let it come into contact with any of
the internal components.
Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes,
and confirm that the voltage between FT-P and FT-N on INV Board has dropped to DC20V or less.
(It takes about 10 minutes to discharge electricity after the power supply is turned off.)

Electromagnetic relay(72C)

DC reactor (DCL)

Noise filter

Capacitor(C100)

Terminal block for power supply
L1,L2,L3,N,

（TB1）

Rush current protection resistor
(R1,R5) Note.2

Note.1

Fan board

INV board

Control board

M-NET board

Terminal block for transmission
line (TB3, TB7)

1) Exercise caution not to damage the bottom and the front panel of the control box. Damage to these parts affect the water­proof and dust proof properties of the control box and may result in damage to its internal components.

2) Faston terminals have a locking function. Make sure the cable heads are securely locked in place. Press the tab on the ter­minals to remove them.

HWE07010 GB

- 51 -

[ III Outdoor Unit Components ]

[3] Outdoor Unit Circuit Board

1. Outdoor unit control board

(1) PUHY-(E)P200, P250, (E)P300, P350, P400, P450YHM-A

CNAC2

L1
 N

CN505
72C
driving output

CN51

Output 12VDC
Compressor
ON/OFF output

Error output

Actuator
driving output

CNDC
Bus voltage input
P
N

CN2

Serial communication signal input
GND

INV board

Output 17VDC

CN801
Pressure switch
connection

CN332

Output 18VDC
 GND

Fan board

）

 （

CN4

ޓGND
ޓSerial communication signal output

LEV
driving output

LED1
Service LED

SWU1,2
Address switch

SW1-5

switch

Dip

CN72
72C
driving output

LED3
Lit
when powered

LED2
Lit during normal
CPU operation

CNAC

L1
 N

LED3
Lit
when powered

F01
Fuse
250V AC／3.15A

External signal input (contact input)

CN102

Power supply input for centralized control system (30VDC)

ޓޓޓ
ޓޓޓ

Indoor/outdoor transmission line input/output (30VDC)

CN41
Power supply for

CN40

centralized control OFF
Power supply for
centralized control ON

Sensor
input

CNVCC2
Output 12VDC
Output 5VDC

CNIT
Output 12VDC
GND
Output 5VDC
Power supply detection input

Power supply ON/OFF signal output
CNS2
Transmission line input/output
for centralized control system (30VDC)

GND

HWE07010 GB

- 52 -

[ III Outdoor Unit Components ]

2. M-NET board

Grounding

CN04
Bus voltage input
P
N

CNS2
Transmission line input/output for

CN102

Power supply output for centralized control system
Indoor/outdoor transmission line input/output

Grounding

Grounding

TB3
Indoor/outdoor
transmission block

centralized control system

Ground terminal for
transmission line

CNIT
Input 12VDC
GND
Input 5VDC
Power supply detection output
Power supply ON/OFF
signal input

TB7
Terminal block for
transmission line for
centralized control

LED1
Power supply for
indoor
transmission line

TP1,2
Check pins for
indoor/outdoor
transmission line

HWE07010 GB

- 53 -

[ III Outdoor Unit Components ]

3. INV board

Bus voltage check
terminal (P)
Note

IGBT
(Rear)

CN1
Bus voltage output
N

P
Bus voltage check
terminal (N)
Note 1

SC-L1
Input(L1)

SC-L2
Input(L2)

SC-P1

SC-P2
Bus voltage Input(P)

Rectifier diode output (P)

CN6
Open: No-load operation setting

LED1
Lit: Inverter in normal operation
Blink: Inverter error

Short-circuited: Normal setting

CN5V
GND
Output 5VDC

RSH1
Overcurrent detection
resistor

CN4
GND

Serial communication
signal output

CN2

ޓsignal output
GND
Input 17VDC

CNTYP Inverter
board type

SC-V
Inverter output(V)

SC-W
Inverter output(W)

SC-U
Inverter output(U)

(INV Board)

S

erial communication

SC-L3
Input(L3)

CT22
Current sensor(W)

CT3
Current sensor(L3)

CT12
Current sensor(U)

C30 C37
Smoothing capacitor

1) Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that
the voltage between FT-P and FT-N on INV Board has dropped to DC20V or less.
(It takes about 10 minutes to discharge electricity after the power supply is turned off.)

HWE07010 GB

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[ III Outdoor Unit Components ]

4. Fan board

CNVDC
Bus voltage input

N
 P

CNINV
Inverter output

W
 V
 U

R630,R631
Overcurrent detection
resistor

DIP IPM Rear

CN18V

Input 18VDC
 GND

LED3
Lit during normal
CPU operation

CN4

GND
 Serial communication signal output

CN5

GND（Control board）



 Serial communication signal output

CN21

Serial communication signal output

GND（INV board）
 Input 17VDC

CN22

GND（INV board）
 Input 5VDC
 Serial communication signal input
 GND（INV board））
 Output 17VDC

THBOX
Thermistor
(Control box internal temperature
detection)

LED1
Inverter in normal operation
LED2
Inverter error

HWE07010 GB

- 55 -

[ III Outdoor Unit Components ]

5. Noise Filter

CN4
Output
(Rectified L2-N current)

ԘP
ԚN

CN2

Surge absorber circuit

Ԙ
Ԛ

Surge absorber circuit

ԜShort circuit
ԝShort circuit

F1,F2,F3,F4
Fuse
250VAC 6.3A

Grounding

CN1A
Input
N
L1

CN5
Output
(Rectified L2-N current)

ԘP
ԚN

Grounding

CN3
Output
L1
N

CN1B
Input

L3
 L2

TB21
Input/output（L1）

TB22
Input/output（L2）

TB23
Input/output（L3）

TB24
Input（N）

HWE07010 GB

- 56 -

IV Remote Controller

[1] Functions and Specifications of MA and ME Remote Controllers ................................... 59

[2] Group Settings and Interlock Settings via the ME Remote Controller ............................. 60

[3] Interlock Settings via the MA Remote Controller ............................................................. 64

[4] Using the built-in Temperature Sensor on the Remote Controller ................................... 65

HWE07010 GB

- 57 -

- 58 -

[ IV Remote Controller ]

IV Remote Controller

[1] Functions and Specifications of MA and ME Remote Controllers

There are two types of remote controllers: M-NET (ME) remote controller, which is connected on the indoor-outdoor
transmission line, and MA remote controller, which is connected to each indoor unit.

1. Comparison of functions and specifications between MA and ME remote controllers

Functions/specifications MA remote controller

*1*2

M-NET (ME) remote controller

*2*3

Remote controller address settings Not required Required

Indoor/outdoor unit address set­tings

Wiring method Non-polarized 2-core cable

Not required (required only by a system
with one outdoor unit)

*4

Required

Non-polarized 2-core cable

∗To perform a group operation, daisy-

chain the indoor units using non-polar­ized 2-core cables.

Remote controller connection Connectable to any indoor unit in the

group

Interlock with the ventilation unit Each indoor unit can individually be in-

terlocked with a ventilation unit. (Set up
via remote controller in the group.)

Changes to be made upon group­ing change

MA remote controller wiring between in­door units requires rewiring.

Connectable anywhere on the indoor-out­door transmission line

Each indoor unit can individually be inter­locked with a ventilation unit. (Set up via
remote controller.)

Either the indoor unit address and remote
controller address must both be changed,
or the registration information must be
changed via MELANS.

*1. MA remote controller refers to MA remote controller (PAR-20MAA, PAR-21MAA), MA simple remote controller, and wire-

less remote controller.

*2. Either the MA remote controller or the M-NET remote controller can be connected when a group operation of units in a

system with multiple outdoor units is conducted or when a system controller is connected.

*3. M-NET remote controller refers to ME remote controller and ME simple remote controller.

*4. Depending on the system configuration, some systems with one outdoor unit may require address settings.

2. Remote controller selection criteria

MA remote controller and M-NET remote controller have different functions and characteristics. Choose the one that better
suits the requirements of a given system. Use the following criteria as a reference.

MA remote controller

*1*2

There is little likelihood of system expansion and group-

ing changes.

Grouping (floor plan) has been set at the time of instal-

lation.

M-NET (ME) remote controller

There is a likelihood of centralized installation of remote

controllers, system expansion, and grouping changes.

Grouping (floor plan) has not been set at the time of in-

stallation.

*1*2

To connect the remote controller directly to the OA pro-

cessing unit.

*1. M-NET remote controller and MA remote controller cannot both be connected to the same group of indoor units.

*2. A system controller must be connected to a system to which both MA remote controller and M-NET remote controller are

connected.

<System with MA remote controller> <System with M-NET remote controllers>

Outdoor unit

MA remote controller

HWE07010 GB

M-NET transmission line
(indoor/outdoor transmission line)

groupgroup

Indoor unit

Outdoor unit

M-NET remote controller

- 59 -

M-NET transmission line
(indoor/outdoor transmission line)

groupgroup

Indoor unit

[ IV Remote Controller ]

[2] Group Settings and Interlock Settings via the ME Remote Controller

1. Group settings/interlock settings

Make the following settings to perform a group operation of units that are connected to different outdoor units or to manually set up the
indoor/outdoor unit address.

(A) Group settings...........Registration of the indoor units to be controlled with the remote controller,

and search and deletion of registered information.

(B) Interlock settings........Registration of LOSSNAY units to be interlocked with the indoor units,

and search and deletion of registered information

[Operation Procedures]

(1) Address settings

Register the indoor unit to be controlled with the remote controller.

1

Bring up either the blinking display of HO by turning on the unit or the
normal display by pressing the ON/OFF button.

The display window must look like one of the two figures below to proceed to the
next step.

C

G

E

STAND BY
DEFROST

PAR-F27MEA

CENTRALLY CONTROLLED

DAILY

AUTO OFF

CLOCK

REMAINDER

˚C

TEMP.

CLOCK→ON→OFF

TIMER SET

ON OFF

1Hr.

NOT AVAILABLE

˚C

FILTER

CHECK MODE

TEST RUN
LIMIT TEMP.

ON/OFF

CHECK TEST

FILTER

F

?

A

D

[Blinking display of HO ]

Bring up the Group Setting window.

2

-Press and hold buttons [FILTER] and [ ]

A

B

[Normal display]

simultaneously for 2 seconds to bring up the display as
shown below.

Indoor unit address display window

3

Select the unit address.

-

Select the address of the indoor unit to be registered by pressing

button

C

[TEMP. ( ) or ( )] to advance or go back

through the addresses.

4

Register the indoor unit whose address appears on the
display.

- Press button [TEST] to register the indoor unit address

D

whose address appears on the display.

- If registration is successfully completed, unit type will appear
on the display as shown in the figure below.

- If the selected address does not have a corresponding indoor
unit, an error message will appear on the display. Check the
address, and try again.

<Successful completion of registration>

Unit type (Indoor unit in this case)

<Deletion error>

H

B

(B) Interlock Settings (A) Group Settings

6

Bring up the Interlock Setting window.

-Press button [ ] to bring up the following display.

G

Press again to go back to the Group Setting window as shown
under step .

Indoor unit
address
display window

7

Bring up the address of the indoor unit and the address of the

2

Interlocked unit
address
display window

Both the indoor unit address and
interlocked unit address will be
displayed together.

To search for an address,
go to section (2) Address Search.

LOSSNAY to be interlocked on the display.

- Select the address of the indoor unit to be registered by pressing
button [TEMP. ( ) or ( )] to advance or go back through

C

the addresses.

- Select the address of the LOSSNAY unit to be interlocked by
pressing button [TIMER SET ( ) or ( )] to advance or go back

H

through the interlocked unit addresses.

8

Make the settings to interlock LOSSNAY units with indoor
units.

- Press button [TEST] while both the indoor unit address and

D

the address of the LOSSNAY units to be interlocked
are displayed to enter the interlock setting.

- Interlock setting can also be made by bringing up the
LOSSNAY address in the indoor unit address display
window and the indoor unit address in the interlocked unit
address display window.

If registration is successfully

blinks to indicate a registration error.
(Indicates that selected address does not have a
corresponding unit.)

5

To register the addresses for multiple indoor units, repeat
steps and above.

3

4

(Displayed alternately)

completed, the two displays as
shown on the left will appear
alternately.
If the registration fails,
will blink on the display.
(Indicates that the selected
address does not have a
corresponding unit.)

To search for an address,
go to section (2) Address Search.

NOTE : Interlock all the indoor units in the group with the
LOSSNAY units; otherwise, the LOSSNAY units will
not operate.

To next page.

HWE07010 GB

- 60 -

[ IV Remote Controller ]

(C) To return to the normal display
When all the group settings and interlock settings are made, take the
following step to go back to the normal display.

10

Press and hold buttons [FILTER] and [ ]

A

B

simultaneously for 2 seconds to go back to the
window as shown in step .

1

(2) Address search

To search for the address of indoor units that have been entered into
the remote controller, follow steps and .

1

2

(A) To search group settings

11

Bring up the Group Setting window.

- Each pressing of button [ ] will bring up the address of a

E

registered indoor unit and its unit type on the display.

<Entry found>

Unit type
(Indoor unit in this case)

<No entries found>

- When only one unit address is registered, the same address
will remain on the display regardless of how many times the
button is pressed.

- When the address of multiple units are registered
(i.e. 011, 012, 013 ), they will be displayed one at a time in
an ascending order with each pressing of button [ ] .

E

Repeat steps and in the previous page to interlock

9

all the indoor units in a group with the LOSSNAY unit.

7

8

To go back to the normal display,
follow step .

10

To search for an address,
go to section (2) Address Search.

(B) Interlock setting search

After performing step , proceed as follows:

12

Bring up the address of the indoor unit to be searched on

6

the display.

- Select the address of the indoor unit to be searched by pressing

H

button [TIMER SET ( ) or ( )] to advance or go back
through the interlocked addresses.

LOSSNAY can be searched in the same manner by bringing up
the LOSSNAY address in the Interlocked unit address display window.

13

Bring up on the display the address of the LOSSNAY unit
that was interlocked with the indoor unit in step .

- With each pressing of button [ ], the address of the

E

LOSSNAY and indoor unit that is interlocked with it will be
displayed alternately.

Address of an interlocked
LOSSNAY unit

(Displayed alternately)

12

14

To delete an address, go to
section (3) Address Deletion.

Bring up the address of another registered unit on the
display.

- After completing step , a subsequent pressing of button

E

[ ] will bring up the address of another registered

13

unit.
(The display method is the same as the one in step .)

To go back to the normal display,
follow step .

10

Address of another
interlocked unit

(Displayed alternately)

To delete an address,

(3) Address deletion

go to section (3) Address Deletion .

The addresses of the indoor units that have been entered into the remote controller can be deleted by deleting the group settings.
The interlock settings between units can be deleted by deleting the interlock settings.
Follow the steps in section (2) Address Search to find the address to be deleted and perform deletion with the address being displayed in the
display window. To delete an address, the address must first be bought up on the display.

15

Delete the registered indoor unit address or the interlock setting between units.

- Press button ? [CLOCK ON OFF] twice while either the indoor unit address or the address of the interlocked unit is displayed on the

F

display to delete the interlock setting.

13

HWE07010 GB

- 61 -

[ IV Remote Controller ]

(A) To delete group settings

(B) To delete interlock settings

<Successful completion of deletion>

will be displayed in the room temperature display window.

(Displayed alternately)

- If a transmission error occurs, the selected setting will not be
deleted, and the display will appear as shown below.
In this case, repeat the steps above.

<Deletion error>

will be displayed in the room temperature display window.

To go back to the normal display, follow step .

10

(4) Making (A) Group settings and (B) Interlock settings of a group from any arbitrary remote controller

(A) Group settings and (B) Interlock settings of a group can be made from any arbitrary remote controller.
Refer to (B) Interlock Settings under section 1 Group Settings/Interlock Settings for operation procedures.
Set the address as shown below.

(A) To make group settings
Interlocked unit address display window...Remote controller address

Indoor unit address display window...........The address of the indoor unit to be controlled with the remote controller

(B) To make interlock settings
Interlocked unit address display window...LOSSNAY address

Indoor unit address display window..........The address of the indoor unit to be interlocked with the LOSSNAY

If deletion is successfully
completed, will appear in

- ­the unit type display window.
If the deletion fails, will
appear in the unit type display
window. In this case, repeat the
steps above.

2. Remote controller function selection via the ME remote controller

In the remote controller function selection mode, the settings for four types of functions can be made or changed as necessary.

1) Skip-Auto-Mode setting
The automatic operation mode that is supported by some simultaneous cooling/heating type units can be made unselectable via the ME remote
controller.

2) Operation mode display selection mode (Display or non-display of COOL/HEAT during automatic operation mode)
When the automatic operation mode is selected, the indoor unit will automatically perform a cooling or heating operation based on the room
temperature. In this case, or will appear on the remote controller display.
This setting can be changed so that only will appear on the display.

3) Room temperature display selection mode (Display or non-display of room temperature)
Although the suction temperature is normally displayed on the remote controller, the setting can be changed so that it will not appear on the
remote controller.

4) Narrowed preset temperature range mode
The default temperature ranges are 19 C to 30 C in the cooling/dry mode and 17 C to 28 C in the heating mode and 19 C to 28 C in the auto mode.

By changing these ranges (raising the lower limit for the cooling/dry mode and lowering the upper limit for the heating mode), energy can be saved.

NOTE

When making the temperature range setting on the simultaneous cooling/heating type units that supports the automatic operation mode to save on
energy consumption, enable the Skip-Auto-Mode setting to make the automatic operation mode unselectable. If the automatic operation mode is
selected, the energy-saving function may not work properly.

When connected to the air conditioning units that do not support the automatic operation mode, the setting for the Skip-Auto-Mode, restricted preset
temperature range mode (AUTO), and operation mode display selection mode are invalid. If an attempt is made to change the preset temperature range,
“LIMIT TEMP.” appears on the display.

PAR-F27MEA

TEMP.

TIMER SET

CLOCK→ON→OFF

ON/OFF

FILTER

CHECK TEST

Normal display

1 1

Remote controller function selection mode

Skip-Auto-Mode setting

*2

Temperature range setting mode (AUTO)

Operation mode display selection mode (Display or non-display of the automatic mode)

5

Restricted preset temperature range mode (Cooling)

4

Restricted preset temperature range mode (Heating)

Room temperature display selection mode

[Function selection mode sequence on the remote controller]

3

2

3

2

3

2

*2

3

2

3

2

3

2

*1 *1

2

[Normal display]

1

: Press and hold the [CHECK] and
[ ] buttons simultaneously
for two seconds.

2

3

: [SET TEMP.

3

: [SET TEMP.

( ) ]
( ) ]

button
button

*1 : Skip-Auto-Mode is enabled
*2 : Skip-Auto-Mode is disabled

HWE07010 GB

- 62 -

[ IV Remote Controller ]

[Operation Procedures]

1. Press the [ON/OFF] button on the remote controller to bring the unit to a stop. The display will appear as shown in the previous page (Normal
display).

2. Press buttons [CHECK] and [ ] simultaneously for 2 seconds to go into the “Skip-Auto-Mode setting.”
under the remote controller function selection mode. Press button [SET TEMP. ( )] or [SET TEMP. ( )] to go into the other four modes

1

2

3

under the remote controller function selection mode.

Skip-Auto-Mode setting (Making the automatic operation mode unselectable)

This setting is valid only when the controller is connected to the simultaneous cooling/heating type air conditioning units that
support the automatic operation mode.

“ ” blinks and either “ON” or “OFF” lights up on the controller. Pressing the [TIMER SET ( ) or ( )] button switches

4

between “ON” and “OFF.”

[TIMER SET ( ) (( ))] button

When set to “ON,” the automatic operation mode is available for selection in the function selection mode.
When set to “OFF,” the automatic operation mode is not available for selection in the function selection mode, and an automatic operation
cannot be performed.
(The automatic operation mode is skipped in the function selection mode sequence.)

Operation mode display selection mode (Display or non-display of room temperature on the remote controller.)

When connected to the air conditioning units that do not support the automatic operation mode, the setting for this mode is invalid.

will blink, and either

switch between “ON” and “OFF.”

“ON”

or “OFF” will light up.

Press button [TIMER SET ( ) or ( )] in this state to

4

[TIMER SET ( ) (( ))] button

When it is set to ON, will appear on the display during automatic operation mode.
When it is set to OFF, only will appear on the display during automatic operation mode.

Restricted preset temperature range mode (The range of preset temperature can be changed.)

1) Temperature range setting for the cooling/dry mode

will light up in the display window, and the temperature range for the cooling/dry mode will appear on the display.
[Lower limit temperature]: Appears in the preset temperature display window [Upper limit temperature: Appears in the time display window
Switch between the Lower and Upper limit temperature setting by pressing the [CLOCK-ON-OFF] button. The selected temperature setting blinks.

5

[TIMER SET ( ) (( ))] button

[The left figure shows the display that appears when the current temperature range setting is between 19 C and 30 C in the Cool/Dry mode,
and the lower limit temperature is selected to be set.]

Press button [TIMER SET ( ) or ( )] to set the lower limit temperature to the desired temperature.

[Settable range for the lower limit temperature] : 19 C
[Settable range for the upper limit temperature] : 30 C 19 C

4

*1

30 C (Settable up to the upper limit temperature that is shown on the display)

*1

(Settable up to the lower limit temperature that is shown on the display)

*1 : The lower limit temperature for the medium temperature unit is 14 C.

2) Temperature range setting for heating

“ ” and the settable temperature range for heating appear on the display.
As with the Cool/Dry mode, use the [CLOCK-ON-OFF] button and the [TIMER SET ( ) or ( )] to set the temperature range.

[Settable range for the lower limit temperature] : 17 C

5

28 C (Settable up to the upper limit temperature that is shown on the display)

[Settable range for the upper limit temperature] : 28 C 17 C

4

(Settable up to the lower limit temperature that is shown on the display)

3) Temperature range setting for the automatic mode

When connected to the air conditioning units that do not support the automatic operation mode, the setting for this mode is invalid.

“ ” and the temperature range for the automatic operation mode appear on the display.
As with the Cool/Dry mode, use the [CLOCK-ON-OFF] button and the [TIMER SET ( ) or ( )] to set the temperature range.
[Settable range for the lower limit temperature] : 19 C

5

*2

28 C (Settable up to the upper limit temperature that is shown on the display)

[Settable range for the upper limit temperature] : 28 C 19 C

4

*2

(Settable up to the lower limit temperature that is shown on the display)

*2 : The lower limit temperature for the medium temperature unit is 17 C.

Room temperature display selection mode (Switching between the display or non-display of room temperature on the controller)

“ 88 C ” blinks and either “ON” or “OFF” lights up on the controller. Pressing the [TIMER SET ( ) or ( )] button

4

switches between “ON” and “OFF.”

˚C ˚C

[TIMER SET ( ) (( ))] button

When set to “ON,” room temperature always appears on the display during operation.
When set to “OFF,” room temperature does not appear on the display during operation.

HWE07010 GB

- 63 -

[ IV Remote Controller ]

[3] Interlock Settings via the MA Remote Controller

1. LOSSNAY interlock setting (Make this setting only when necessary.)

Make this setting only when necessary.

Perform this operation to enter the interlock setting between the LOSSNAY and the indoor units to which the remote controller is connected, or to
search and delete registered information.

In the following example, the address of the indoor unit is 05 and the address of the LOSSNAY unit is 30.

[Operation Procedures]

Press the [ON/OFF] button on the remote controller to bring the unit to a stop.

1

The display window on the remote controller must look like the figure below to proceed to step .

Press and hold the [FILTER] and [ ] buttons simultaneously for two seconds to perform a search for the LOSSNAY that is interlocked with the

2

indoor unit to which the remote controller is connected.

Search result

3

- The indoor unit address and the interlocked LOSSNAY address will appear alternately.

2

<Indoor unit address and indoor unit> <LOSSNAY address and LOSSNAY>

- Without interlocked LOSSNAY settings

4

If no settings are necessary, exit the window by pressing and holding the [FILTER] and [ ] buttons simultaneously for 2 seconds.
Go to step 1. Registration Procedures to make the interlock settings with LOSSNAY units, or go to step 2. Search Procedures to search for a
particular LOSSNAY unit.
Go to step 3. Deletion Procedures to delete any LOSSNAY settings.

< 1. Registration Procedures >

5

To interlock an indoor unit with a LOSSNAY unit, press the [ TEMP. ( ) or ( )] button on the remote controller that is connected to the indoor
unit, and select its address (01 to 50).

6

Press the [ CLOCK ( ) or ( )] button to select the address of the LOSSNAY to be interlocked (01 to 50).

Indoor unit address LOSSNAY address

7

Press the [TEST] button to register the address of the selected indoor unit and the interlocked LOSSNAY unit.

- Registration completed
The registered indoor unit address and IC, and the interlocked LOSSNAY address and LC will appear alternately.

- Registration error
If the registration fails, the indoor unit address and the LOSSNAY address will be displayed alternately.

Registration cannot be completed: The selected unit address does not have a corresponding indoor unit or a LOSSNAY unit.
Registration cannot be completed: Another LOSSNAY has already been interlocked with the selected indoor unit.

HWE07010 GB

- 64 -

[ IV Remote Controller ]

< 2. Search Procedures >

8

To search for the LOSSNAY unit that is interlocked with a particular indoor unit, enter the address of the indoor unit into the remote controller that is
connected to it.

<Indoor unit address>

9

Press the [ MENU] button to search for the address of the LOSSNAY unit that is interlocked with the selected indoor unit.

- Search completed (With a LOSSNAY connection)
The indoor unit address and IC, and the interlocked LOSSNAY address and LC will appear alternately.

- Search completed (No interlocked settings with a LOSSNAY exist.)

- The selected address does not have a corresponding indoor unit.

< 3. Deletion Procedures >

Take the following steps to delete the interlock setting between a LOSSNAY unit and the interlocked indoor unit from the remote controller
that is connected to the indoor unit.
Find the address of the LOSSNAY to be deleted (See section 2. Search Procedures. ), and bring up the result of the search for both the

10

indoor unit and LOSSNAY on the display.

11

Press the [ ON/OFF] button twice to delete the address of the LOSSNAY unit that is interlocked with the selected indoor unit.

- Registration completed
The indoor unit address and , and the interlocked LOSSNAY address and will appear alternately.

-Deletion error
If the deletion fails

[4] Using the built-in Temperature Sensor on the Remote Controller

1. Selecting the position of temperature detection (Factory setting: SW1-1 on the controller board on the indoor unit is
set to OFF.)

To use the built-in sensor on the remote controller, set the SW1-1 on the controller board on the indoor unit to ON.

Some models of remote controllers are not equipped with a built-in temperature sensor. Use the built-in temperature sensor

on the indoor unit instead.

When using the built-in sensor on the remote controller, install the remote controller where room temperature can be detected.

HWE07010 GB

- 65 -

- 66 -

V Electrical Wiring Diagram

[1] Electrical Wiring Diagram of the Outdoor Unit ................................................................. 69

[2] Electrical Wiring Diagram of Transmission Booster......................................................... 70

HWE07010 GB

- 67 -

- 68 -

[ V Electrical Wiring Diagram ]

V Electrical Wiring Diagram

[1] Electrical Wiring Diagram of the Outdoor Unit

1. Electrical wiring diagram of the outdoor unit

(1) PUHY-(E)P200, P250, (E)P300, P350, P400, P450 models

LEV2b

LEV2a

63H1

P

6

CNDC

13 12 21 21

12

pink

31

LEV1

M

CNLVA

CN4

CN332

blue

CNT02

CN801

yellow

CNT01

CPU power

M

12345

6

CNLVB

CN2

752

1

ZNR01

CN72

red

supply circuit

1

2

12345

6

red

Power failure

detection circuit

U

CNAC2

1

2

M

54321

red

CNLVC

LED1

Control Board

X01

black

CN501

3

2

1

X02

CN502

1

3

1

black

CNTYP2

ONOFF

SW1

1

LED1

Display

10

ONOFF

SW2

1

10

ONOFF

SW3

1

10

ONOFF

1

ONOFF

1

1's

10's

SWU2 SWU1

X03

CN503

blue

3

1

digit

digit

X04

CN504

green

3

1

Function

SW4

10

SW5

10

Unit address

setting

X05

CN506

653

setting

1

TH6

ttt

Z24

Z25

1

321

432

CN213

green

green

CNTYP5

CNTYP4

setting

*3

Compressor ON/OFF output

Error detection output

543

1

CN51

12V

X06

X08

X07

CN507

red

653

135

6

TH7

TH3

1

2

1

red

CN212

LED3:Lit when powered

X09

X10

CN508

black

1

2

TH5

t

1

CN990

TH2

63LS

63HS1

213

213

t

321

231

2

1

red

black

CN202

CN201

CN215

ON

TB7 Power

selecting

connector

CN40

1234

LED2:CPU in operation

F01

AC250V

TH4

t

1

CN211

red

yellow

red

blue

yellow

3.15A T

2

CNIT

CNS2

CN41

CN102

CN3D

CN3S

CN3N

CN3K

51234

21

OFF

1234

4321

123

123

123

12

21 3

CNAC

TP2TP1

CNIT

red

SM2M1

TB7

M1 M2

CNS2

yellow

TB3

CN102

LED1:Power supply to

Indoor/Outdoor transmission line

M-NET power

supply circuit

M-NET Board

Central control

transmission

cable

Indoor/Outdoor

transmission

cable

Indoor/Outdoor

transmission

cable

*4

Appliance

*7 do not exist

*7 exist

CN04

1

21 5432

4321

red

13

*3

Model name

P350/P400/P450

EP300

P200/P250/P300

EP200

red

*7.Difference of appliance

5

234

1

654

blue

CN21

CN5

red

CN4

operation

21 1 3 12

LED3:CPU in

blue

CN18V

F01

DC700V

4A T

4

FAN Board

6

72C

1

2

3

red

CN22

IPM

R631

R630

C631

C630

1

CNVDC

U

Fan motor

(Heat exchanger)

21S4b

t

THBOX

operation

LED1:Normal

471

V

W

3

M

SV1a

LED2:Error

C100

CNINV

CH11

21S4a

SV5b

*7

1

2

CN2

CN4

1

CN5V

yellow

C1

21 3

CN6

/Error(blink)

2

43

black

72C

1

red

red

LED1 Normal operation(lit)

SC-P1

FT-P

FT-N

*6

P

N

SC-P2

4

1

CN1

3

1

Z5

R5

red

CN5

D1

R4

R6

CN4

blue

C17

31

DSA

653

1

CN2

*5

black

R1 R5

DCL

SV5c

15271

RSH1

C31

C33

C30

C32

Diode

U

Noise

U

Z4

F1,F2,F3

AC250V

6.3A T

21S4c

3

t

IGBT

C35

C34

Bridge

Filter

F3F2F1

CNTYP

THHS

C37

C36

F4

C10

Z3

Z1 Z2

SV9

black

SC-V

R31

R33

R30

R32

AC250V

6.3A T

C6

C5

C4

C3

UUU

R35

R34

C2

SC-W

SC-U

SC-L1

*1.Single-dotted lines indicate wiring

not supplied with the unit.

*2.Dot-dash lines indicate the control

box boundaries.

*3.Refer to the Data book for connecting

input/output signal connectors.

*4.Daisy-chain terminals (TB3) on the

outdoor units in the same refrigerant

system together.

*5.Faston terminals have a locking

function.Make sure the terminals

are securely locked in place after

insertion.Press the tab on the

terminals to removed them.

*6.Control box houses high-voltage parts.

Before inspecting the inside of the

control box,turn off the power,keep

the unit off for at least 10 minutes,

and confirm that the voltage between

FT-P and FT-N on INV Board has dropped

to DC20V or less.

blackwhitered

W

3

V

MS

Motor

(Compressor)

red white black

CT12 CT22

SC-L2

SC-L3

CT3

black

white

red

U

Explanation

Subcool bypass outlet

temperature

Subcooled liquid refrigerant

Indoor/Outdoor transmission

cable

Central control transmission

cable

Power supply

For opening/closing the bypass

circuit

Solenoid

valve

Terminal

block

Thermistor

temperature

Pipe temperature

Control box internal temperatureTHBOX

Discharge pipe temperature

ACC inlet pipe temperature

OA temperature

IGBT temperature

Function setting connector

INV Board

Symbol

red

C7C8C9

C1

L

TB24

N

TB23

L3

TB22

L2

TB21

L1

CN1B

R1R2R3

4131

NL3L2L1

TB1

3N

50/60Hz

NL3L2L1

Explanation

380/400/415V

3

1

CN3

green

black

white

Power Source

CN1A

Symbol

<Symbol explanation>

TB7

TB3

TB1

SV9

High pressure protection for the

outdoor unit

Low pressure

Discharge pressure

Magnetic relay(inverter main circuit)72C

Pressure

switch

Pressure

sensor

4-way valve21S4a,b,c

63LS

63H1

63HS1

TH5

TH4

TH3

TH2

Pressure control,Refrigerant flow

HIC bypass,Controls refrigerant

flow in HIC circuit

DC reactorDCL

Linear

expansion

valve

Current sensor(AC)

LEV2a,b

LEV1

CT12,22,3

CH11 Crankcase heater(for heating the compressor)

Z24,25

THHS

TH7

TH6

rate control

Outdoor unit heat exchanger

capacity control

For opening/closing the bypass

circuit under the O/S

Solenoid

valve

SV1a

SV5b,c

HWE07010 GB

- 69 -

[ V Electrical Wiring Diagram ]

[2] Electrical Wiring Diagram of Transmission Booster

Terminal block for power supply
(TB1)

L

100V/200VAC

Grounding

Red

White

Green

250V 5A

Red Red

Red

DSAR

White BlueRedRed

12

CN3

1212

Electronic control board

Red

White

Red

Varistor

White White

White

Choke coil

CN2

CN4

CN1

2

1

Red

Red

Blue

White

White

Red

Black

Red

White

1

2

4

3

Stabilized power supply

2

1

CN2

Noise filter

1

2

3

3

E

4

Black

Green/Yellow

Black

Black

Black

CN1

White

Red

Black

Red

S

Terminal block 2 for

B

transmission line (TB3)
Expanded (indoor unit) side

A

S

Terminal block 1 for

B

transmission line (TB2)
Expanded (outdoor unit) side

A

HWE07010 GB

- 70 -

VI Refrigerant Circuit

[1] Refrigerant Circuit Diagram ............................................................................................. 73

[2] Principal Parts and Functions .......................................................................................... 74

HWE07010 GB

- 71 -

- 72 -

[ VI Refrigerant Circuit ]

VI Refrigerant Circuit

[1] Refrigerant Circuit Diagram

1. Outdoor unit

(1) PUHY-P200, P250, P300 models, EP200 models

SV9

21S4a

CV1

CP2

TH2

SCC(HIC Circuit)

21S4b

TH7

SV5b

TH3

(2) PUHY-P350, P400, P450 models, EP300 models

LEV1

TH4

O/S

COMP

CJ1

63H1

63HS1

ST3

TH6

SV1a

CP1

LEV2a

LEV2b

ST7

ACC

ST6

63LS

TH5

CJ2

ST1

ST2

BV1

BV2

SV5c

TH7

SV5b

21S4c

SV9

TH3

21S4b

TH2

SCC(HIC Circuit)

CP2

CV1

21S4a

LEV1

TH4

O/S

COMP

CJ1

63H1

63HS1

ST3

TH6

SV1a

CP1

LEV2a

LEV2b

ST7

ST6

ACC

63LS

TH5

CJ2

ST2

ST1

BV1

BV2

HWE07010 GB

- 73 -

[ VI Refrigerant Circuit ]

[2] Principal Parts and Functions

1. Outdoor unit

Part

name

Com­pressor

High
pres­sure
sensor

Low
pres­sure
sensor

Symbols

(functions)

MC1
(Comp1)

Notes Usage Specifications Check method

Adjusts the amount of circulating
refrigerant by adjusting the operat­ing frequency based on the oper­ating pressure data

63HS1 1) Detects high pressure

2) Regulates frequency and pro­vides high-pressure protec­tion

63LS 1) Detects low pressure

2) Provides low-pressure pro­tection

200 - 250 models
Low-pressure shell scroll
compressor
Wirewound resistance
20°C[68°F] : 0.981ohm

300 - 450 models
Low-pressure shell scroll
compressor
Wirewound resistance
20°C[68°F] : 0.583ohm

Pressure
0~4.15 MPa [601psi]

63HS1

Vout 0.5~3.5V

123

0.071V/0.098 MPa [14psi]

Con­nector

Con­nector

Pressure [MPa]
=1.38 x Vout [V]-0.69
Pressure [psi]
=(1.38 x Vout [V] - 0.69) x 145

1

GND (Black)

2

Vout (White)

3

Vcc (DC5V) (Red)

Pressure

63LS

0~1.7 MPa [247psi]
Vout 0.5~3.5V

123

0.173V/0.098 MPa [14psi]
Pressure [MPa]
=0.566 x Vout [V] - 0.283
Pressure [psi]
=(0.566 x Vout [V] - 0.283) x 145

1

GND (Black)

2

Vout (White)

3

Vcc (DC5V) (Red)

Pres­sure
switch

63H1 1) Detects high pressure

2) Provides high-pressure pro­tection

4.15MPa[601psi] OFF setting

HWE07010 GB

- 74 -

[ VI Refrigerant Circuit ]

Part

name

Ther­mistor

Symbols

(functions)

TH4
(Discharge)

Notes Usage Specifications Check method

1) Detects discharge air temper­ature

2) Provides high-pressure pro­tection

0°C[32°F] :698kohm
10°C[50°F] :413kohm
20°C[68°F] :250kohm
30°C[86°F] :160kohm
40°C[104°F] :104kohm
50°C[122°F] : 70kohm
60°C[140°F] : 48kohm
70°C[158°F] : 34kohm
80°C[176°F] : 24kohm
90°C[194°F] :17.5kohm
100°C[212°F] :13.0kohm
110°C[230°F] : 9.8kohm

TH2 LEV 1 is controlled based on the

TH2, TH3, and TH6 values.

TH3
(Pipe
temperature)

1) Controls frequency

2) Controls defrosting during
heating operation

3) Detects subcool at the heat
exchanger outlet and controls
LEV1 based on HPS data
and TH3 data

TH7
(Outdoor tem­perature)

1) Detects outdoor air tempera­ture

2) Controls fan operation

TH5 LEV2a and LEV2b are controlled

based on the 63LS and TH5 val­ues.

Degrees Celsius Resistance

R = 7.465k

120

R = 4057

25/120

R =

t

7.465

exp

4057

Degrees Celsius

R = 15k

0

R = 3460

0/80

exp

R = 15

t

3460

1

273 t

1

273 t

393

check

1

Resistance
check

1

273

0°C[32°F] :15kohm
10°C[50°F] :9.7kohm
20°C[68°F] :6.4kohm
25°C[77°F] :5.3kohm
30°C[86°F] :4.3kohm
40°C[104°F] :3.1kohm

TH6 Controls LEV1 based on TH2,

TH3, and TH6 data.

THHS
Inverter

Controls inverter cooling fan

based on THHS temperature
heat sink tem­perature

THBOX
Control box in­ternal tempera­ture detection

Degrees Celsius

R = 17k

50

R = 4016

25/120

exp

R = 17

t

4016

273 t

0°C[32°F] :161kohm
10°C[50°F] :97kohm
20°C[68°F] :60kohm
25°C[77°F] :48kohm
30°C[86°F] :39kohm
40°C[104°F] :25kohm

1

1

323

HWE07010 GB

- 75 -

[ VI Refrigerant Circuit ]

Part

name

Sole­noid
valve

Linear
expan­sion
valve

Symbols

(functions)

SV1a
Discharge-suc­tion
bypass

Notes Usage Specifications Check method

1) High/low pressure bypass at
start-up and stopping, and
capacity control during low­load operation

AC208-230V
Open while being powered/
closed while not being pow­ered

2) High-pressure-rise preven­tion

SV5b
Heat

Controls outdoor unit heat ex-

changer capacity
exchanger
capacity control

SV5c P350 -

P450
EP300
mod­els only

SV9 High-pressure-rise prevention Open while being powered/

closed while not being pow­ered

LEV1
(SC control)

Adjusts the amount of bypass flow

from the liquid pipe on the outdoor

unit during cooling

DC12V
Opening of a valve driven by a
stepping motor 0-480 pulses
(direct driven type)

Continuity
check with a
tester

Same as in­door LEV
The resistance
value differs
from that of the
indoor LEV.
(Refer to the
section "LEV
Troubleshooti
ng."(page 226
))

LEV2a
LEV2b

Adjusts refrigerant flow during

heating
(Refrigerant
flow adjust­ment)

Heater CH11 Heats the refrigerant in the com-

pressor

4-way
valve

21S4a Changeover between heating and

cooling

21S4b 1) Changeover between heating

21S4c P350 -

P450
EP300

and cooling

2) Controls outdoor unit heat ex­changer capacity

mod­els only

DC12V
Opening of a valve driven by a
stepping motor 1400 pulses

Cord heater AC230V
P200 - P250 models
1511 ohm 35W
P300 - P450 models
1176 ohm 45W

AC208-230V
Dead: cooling cycle
Live: heating cycle

AC208-230V
Dead: cooling cycle
Outdoor unit heat exchanger
capacity at 100%
Live: heating cycle
Outdoor unit heat exchanger
capacity at 50%
or heating cycle

Same as in­door LEV

Resistance
check

Continuity
check with a
tester

HWE07010 GB

- 76 -

[ VI Refrigerant Circuit ]

2. Indoor Unit

Part

Name

Linear
expan­sion valve

Ther­mistor

Symbol

(functions)

Notes Usage Specification Check method

LEV 1) Adjusts superheat at the

indoor heat exchanger
outlet during cooling

2) Adjusts subcool at the
heat exchanger outlet of
the indoor unit during
cooling

TH1

Indoor unit control (Thermo)
(Suction air
temperature)

TH2
(Pipe temper­ature)

1) Indoor unit control (Frost
prevention, Hot adjust)

2) LEV control during heat­ing operation (subcool
detection).

TH3
(Gas pipe

LEV control during cooling op­eration (superheat detection)

temperature)

DC12V
Opening of stepping motor
driving valve 0-(1400) puls­es

R0=15k
R

0/80

=3460
Rt =
15exp{3460( - )}

1

273+t

1

273

0°C [32°F]:15kohm
10°C [50°F] :9.7kohm
20°C [68°F]:6.4kohm
25°C [77°F] :5.3kohm
30°C [86°F] :4.3kohm
40°C [104°F] :3.1kohm

Refer to the section
"Continuity Test with a
Tester".
Continuity between
white, red, and or­ange.
Continuity between
yellow, brown, and
blue.

White

Red

Orange

Yellow

Ｍ

Brown Blue

Resistance check

TH4
Outdoor air
temperature)

Temperature
sensor (In­door air tem­perature)

Indoor unit control (Thermo)

Indoor unit control (Thermo)

HWE07010 GB

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- 78 -

VII Control

[1] Functions and Factory Settings of the Dipswitches ......................................................... 81

[2] Controlling the Outdoor Unit ............................................................................................ 87

[3] Operation Flow Chart....................................................................................................... 99

HWE07010 GB

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- 80 -

[ VII Control ]

VII Control

[1] Functions and Factory Settings of the Dipswitches

1. Outdoor unit
(1) Control board

Function according to switch setting Switch setting timing

Switch Function

OFF ON OFF ON OC OS

SWU 1-2 Unit address setting Set to 00 or 51-100 with the dial switch Before power on C C

SW1 1-10

1

2

3

For self-diagnosis/
operation monitoring

Centralized control
switch

Deletion of connec­tion information

Deletion of error his­tory SW

Refer to the LED monitor display on the
outdoor unit board.

Without connection
to the centralized
controller

With connection to
the centralized con­troller

Anytime after power on

Before power on

Normal control Deletion Before power on

(OC) Storage of IC/
OC error history

(OC) Deletion of IC/
OC error history

Anytime after power on
(When switched from OFF

(OS) Storage of OS
error history

(OS) Deletion of
OS error history

to ON)

After being energized and

4 Pump down mode Normal control Pump down mode

while the compressor is
stopped

SW2

5- - - - -­6- - - - --

Anytime af-

Forced defrost

7

(Note 3)

Normal control

Forced defrost
starts

10 minutes
after com­pressor
startup

ter power
on (When
switched
from OFF to
ON)

Defrost timer setting

8

(Note 3)

50 minutes 90 minutes

Anytime after power on
(When switched from OFF
to ON)

9- - - - --

10 - - - - - -

Units that re-

quire switch

setting
Note.2

CC

BB

A-

CC

A-

AA

BB

1) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.

2) A: Switch setting is required on any one of OC, OS1 and OS2.
B: The switch on the all of OC, OS1 and OS2 must be set to the same settings.
C: The switch on OC, OS1 and OS2 must be set individually.

3) Refer to "VII [2] Controlling the Outdoor Unit" for details.(page 87)

HWE07010 GB

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[ VII Control ]

Switch Function

Test run mode: en-

1

abled/disabled

Test run mode: ON/

2

OFF

Defrost start temper-

3

ature (Note 3)

Function according to switch setting Switch setting timing

OFF ON OFF ON OC OS

SW3-2 disabled SW3-2 enabled Anytime after power on

Stops all ICs

Sends a test-run
signal to all IC

After power on and when
SW3-1 is on.

P200 - P300
EP200

-10°C [14°F]

-5°C [23°F] Anytime after power on

P350 - P450
EP300

-8°C [18°F]

Units that re-

quire switch

setting
Note.2

A-

A-

BB

SW3

SW4

Defrost end temper-

4

ature (Note 3)

P200 - P300
EP200
10°C [50°F]

P350 - P450
EP300
7°C [45°F]

P200 - P300
EP200
15°C [59°F]

P350 - P450
EP300
12°C [54°F]

BB

Anytime after power on
(except during defrost op­eration)

5- - - - -­6- - - - -­7- - - - -­8- - - - --

9 Model setting

10 Model setting

Outdoor standard
static pressure

High static pressure
60Pa

Outdoor high static
pressure

High static pressure
30Pa

Before being energized

Before being energized

CC

CC

1- - - - -­2- - - - --

Anytime after being ener-

A-

gized (except during ini-

Refrigerant amount

3

adjustment

Normal operation
mode

Refrigerant amount
adjust mode

tial startup mode.
Automatically cancelled
90 minutes after com­pressor startup)

Low-noise mode/

4

step demand switch-

Low-noise mode Step demand mode Before being energized

CC

ing (Note 3)

5- - - - --

Cumulative com-

6

pressor operation
time data deletion

Cumulative com­pressor operation
time data is re­tained.

Cumulative com­pressor operation
time data is delet­ed.

Anytime after power on
(when the unit is turned
on)

CC

7- - - - -­8- - - - -­9- - - - --

10 - - - - - -

1) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.

2) A: Switch setting is required on any one of OC, OS1 and OS2.
B: The switch on the all of OC, OS1 and OS2 must be set to the same settings.
C: The switch on OC, OS1 and OS2 must be set individually.

3) Refer to "VII [2] Controlling the Outdoor Unit" for details.(page 87)

HWE07010 GB

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[ VII Control ]

Units that re-

Switch Function

Function according to switch setting Switch setting timing

quire switch

setting
Note.2

OFF ON OFF ON OC OS

1
2

Model selection See the table below (Note 3) Before being energized

CC

3
4

SW5

Low-noise mode

5

selection
(Note 3)

Capacity priority
mode

Quiet priority mode Before being energized

A-

6- - - - -­7 Model selection See the table below (Note 4). Before being energized B B

8- - - - -­9- - - - --

10 - - - - - -

1) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.

2) A: Switch setting is required on any one of OC, OS1 and OS2.
B: The switch on the all of OC, OS1 and OS2 must be set to the same settings.
C: The switch on OC, OS1 and OS2 must be set individually.

3) Refer to "VII [2] Controlling the Outdoor Unit" for details.(page 87)

4) The table below summarizes the factory settings for dipswitches SW5-1 through SW5-4, and SW5-7. The factory setting for
all other dipswitches is OFF.

SW 5

12347

OFF ON OFF OFF ON (E)P200YHM model

ON ON OFF OFF ON P250YHM model

OFF OFF ON OFF ON (E)P300YHM model

OFF ON ON OFF ON P350YHM model

ON ON ON OFF ON P400YHM model

OFF OFF OFF ON ON P450YHM model

(2) INV board

Functions are switched with the following connector.

Connector Function

CN6 short­circuit con-

nector

Enabling/disabling the following error
detection functions;
ACCT sensor failure
(5301 Detail No. 115)
ACCT sensor circuit failure
(5301 Detail No.117)
IPM open/ACCT erroneous wiring
(5301 Detail No. 119)
Detection of ACCT erroneous wiring
(5301 Detail No.120)

model

Function according to connec-

tor

Setting timing

Not available Available Not available Available

Error detec­tion enabled

Error detec­tion disable

Anytime after power on

(No load op­eration is pos­sible.)

CN6 short-circuit connector is mated with the mating connector.
Leave the short-circuit connector on the mating connector during normal operation to enable error detection and protect the

equipment from damage.

HWE07010 GB

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[ VII Control ]

2. Function of the switch (Indoor unit)

(1) Dipswitches

1) SW1,3

Switch Function

Function according to switch setting

OFF ON

SW1

Room temperature

1

detection position

2

Clogged filter detection

3

Filter check reminder time setting

4

Outside air intake

5

Remote display option

6

Humidifier control

Fan speed setting for
Heating Thermo-OFF

7

Forced heating operation
at OA temp of 5 C or below

Fan speed setting for
Heating Thermo-OFF

8

Indoor unit inlet

Not available

100h

Disabled

Fan output

During heating operation

Very Low Low

Not available

According to the
SW1-7 setting

Built-in sensor on
the remote controller

Available

2500h

Enabled

Thermo-ON signal

Always on while in the heating mode

Available

Preset speed

- - -

9

Self-recovery after power failure

10

Power source start-stop

1

Unit model selection

2

Louver

3

Van e

4

Vane swing function

SW3

5

Vane angle limit setting
for cooling operation

6

-

Initial vane position

Automatic LEV value

7

conversion function

8

Heating 4K up

9

SHm setting 2

10

SCm setting 10 15

Note 1. Settings in the shaded areas are factory settings. (Refer to the table below for the factory setting of the switches whose factory settings are not indicated by the shaded cells.)

Note 2. If both SW1-7 and SW1-8 are set to ON, the fan remains stopped during heating Thermo-ON.

Disabled

Enabled

Disabled Enabled

Heat pump

Not available

Cooling only

Available

Not available Available

Not available Available

- -

Downblow B,C Horizontal

Enabled

Disabled

Not available Available

Enabled

Disabled

5

Switch setting timing

OFF ON

Set to ON (built-in sensor on the remote controller)
on All Fresh (PEFY-VMH-F) model units

Always set to OFF on PKFY-AM model units

Applicable to All Fresh model units
(PEFY-VMH-F) only

Applicable to All Fresh model units

While the unit is stopped

(PEFY-VMH-F) only

(Remote controller OFF)

Always set to OFF on PKFY-VAM model units

Always set to Downblow B or C on
PKFY-VAM model units

PLFY-VLMD model only

Set to OFF on floor-standing
(PFFY) type units

The setting depends on the
model and type.

The setting depends on the
model and type.

Notes

To prevent incorrect temperature detection due to a build-up of warm air around the indoor unit, use the built-in temperature sensor on the remote controller (SW1-1)
instead of the one on the indoor unit inlet thermistor.
Note 3. By setting SW3-1, SW1-7, and SW1-8 to a certain configuration, the fan can be set to remain stopped during cooling Thermo-OFF. See the table below for details.

Switch setting

SW3-1

SW1-7 SW1-8 Heating Cooling

OFF

ON

OFF

OFF

ON

OFF

ON

ON

OFF

ON

Fan speed during Thermo-OFF

Very Low

OFF

Low

Preset speed

ON

Stop

−

OFF

−

−

ON

Stop

Preset speed

Preset speed

Stop

Stop

Cooling-only/heat pump

Heat pump

Cooling-only

Heat pump

2) SW2

Model

Capacity (model) code

SW2

setting

Note. The setting timing for SW2 is before power is turned on.

HWE07010 GB

123456

ON
OFF

P20

4

ON
OFF

P25

5

123456

ON
OFF

P32

6

123456

ON
OFF

P40

8

123456

ON
OFF

P50

10

123456

ON
OFF

P63

13

123456

- 84 -

P7114P8016P10020P125

ON
OFF

123456

ON
OFF

123456

ON
OFF

123456

ON
OFF

25

123456

ON
OFF

P140

28

123456

P20040P250

123456

ON
OFF

ON
OFF

50

123456

[ VII Control ]

(2) Address switch

Actual indoor unit address setting varies in different systems. Refer to the installation manual for the outdoor unit for details
on how to make the address setting.
Each address is set with a combination of the settings for the 10's digit and 1's digit.
(Example)

When setting the address to "3", set the 1's digit to 3, and the 10's digit to 0.
When setting the address to "25", set the 1's digit to 5, and the 10's digit to 2.

3. Function of the switch <Remote controller>

(1) MA remote controller (PAR-20MAA)

The SW is located at the bottom of the remote controller under the cover. Operate the switches to perform the remote con­troller main/sub setting or other function settings. Normally, do not change the settings of switches other than the SW1 (main/
sub switching switch). (All the switches are set to "ON" at factory setting.)

1ON234

Remote controllerSwitching switch

Switch

Remote controller

1

main/sub setting

At power on of the

2

remote controller

Cooling/heating display

3

set by automatic setting

Suction temperature display

4

(discharge temperature display)

Function

ON OFF

Main Sub

Normal

startup

Displayed Not displayed

Displayed Not displayed

Timer mode

startup

When two remote controllers are connected
to one group, set either of the remote
controllers to "Sub".

When the program timer (only few stock
products are available) is connected, set to
"Timer mode startup" to resume the operation
with timer mode after power is restored.

When the automatic mode is set and the
"Cooling"/"Heating" display is not necessary,
set to "Not displayed".

When the suction temperature (discharge
temperature) display is not necessary,
set to "Not displayed".

Operation by switch settings

Switch setting timing

Before power on

Before power on

Before power on

Before power on

The MA remote controller (PAR-21MAA) does not have the switches listed above. Refer to the installation manual for the func­tion setting.

HWE07010 GB

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[ VII Control ]

(2) ME remote controller (PAR-F27MEA)

Set the address of the remote controller with the rotary switch.

0

0

1

1

9

9

2

2

3

8

3

8

7

4

7

4

6

6

5

5

Remote controller unit

Address setting range Setting method

Main remote controller 101-150 Add 100 to the smallest address of all the indoor units in the

Sub remote controller 151-200 Add 150 to the smallest address of all the indoor units in the

Setting of rotary switch Address No.

*1

01-99

101-199 with the 100's digit automatically being set to 1

00 200

Rotary switch

0

9

8

7

6

0

1

5

1

9

2

4

2

3

3

8

7

4

6

5

10's digits 1's digits

(left) (right)

Example: In case of address 108

same group.

same group.

*2

*1. At factory shipment, the rotary switch is set to 01.

*2. The address range that can be set with the ME remote controller is between 101 and 200. When the dials are set to

a number between 01 and 99, the 100's digit is automatically set to [1]. When the dials are set to 00, the 100's digit is
automatically set to [2].

To set addresses, use a precision slotted screw driver [20 mm [0.8 in] (w)], and do not apply than 19.6N.
The use of any other tool or applying too much load may damage the switch.

HWE07010 GB

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[ VII Control ]

[2] Controlling the Outdoor Unit

-1- Outline of Control Method

The outdoor units are designated as OC, OS1 and OS2 in the order of capacity from large to small (if two or more units have

the same capacity, in the order of address from small to large).

The setting of outdoor unit can be verified by using the self-diagnosis switch (SW1).

SW1

123 54 678910

ON

The OC determines the operation mode and the control mode, and it also communicates with the indoor units.
The OS exercises autonomous distributed control (over defrost, error detection, and actuator control etc.) according to the

operation/control mode signals that are sent from the OC.

The unit is designated as the OC: “oc” appears on the display.
The unit is designated as OS1: “oS-1” appears on the display
The unit is designated as OS2: “oS-2” appears on the display.

Display

-2- Startup sequence rotation

At the initial startup, outdoor units start up in the order of "OC, OS1 and OS2." After two or more hours of operation, the startup

sequence changes to "OS1, OS2 and OC" or "OS2, OC and OS1".

Startup sequence rotation is performed while all the indoor units are stopped. (Even after two hours of operation, startup se-

quence rotation is not performed while the compressor is in operation.)

Refer to [-12-Control at Initial Start-up] for the initial startup.
Performing startup sequence rotation does not change the basic operation of OC and OS. Only startup sequence is changed.
Startup sequence of the outdoor units can be checked with the self-diagnosis switch (SW1) on the OC.

Display SW1

1 2 3 5 4 6 7 8 9 10

ON

OC→OS1→OS2: “oc” and the OC address appear alternately on the display.
OS1→OS2→OC: “oS-1” and the OS-1 address appear alternately on the display.
OS2→OC→OS1: “oS-2” and the OS-2 address appear alternately on the display.

-3- Initial Control

When the power is turned on, the initial processing of the microcomputer is given top priority.
During the initial processing, control processing of the operation signal is suspended. (The control processing is resumed after

the initial processing is completed. Initial processing involves data processing in the microcomputer and initial setting of each
of the LEV opening. This process will take up to 5 minutes.)

During the initial processing, the LED monitor on the outdoor unit's control board displays S/W version -> refrigerant type

-> heat pump -> cooling only and capacity -> and communication address in turn every second.

-4- Control at Start-up

The upper limit of frequency during the first 3 minutes of the operation is 50 Hz.
When the power is turned on, normal operation will start after the initial start-up mode (to be described later) has been com-

pleted (with a restriction on the frequency).

HWE07010 GB

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[ VII Control ]

-5- Bypass Control

Bypass solenoid valves (SV1a), which bypass the high- and low- pressure sides, perform the following functions.

(1) Bypass solenoid valve (SV1a) (ON = Open), (SV9) (ON = Open)

Operation

SV1a

ON OFF

When each indoor unit compressor startup ON for 4 minutes.

After the restoration of thermo or 3 minutes

ON for 4 minutes.

after restart

During cooling or heating operation with the
compressor stopped

Exception: OFF when 63HS1-63LS is 0.2 MPa [29 psi] or less

Always ON.

After the operation has stopped ON for 3 minutes.

Exception: OFF when 63HS1-63LS is 0.2 MPa [29 psi] or less

During defrost operation ON

While the compressor is operating at the
minimum frequency and when the low pres-

When low pressure (63LS) drops
below 0.23 MPa [33 psi].

When low pressure (63LS) ex-

ceeds 0.38 MPa [55 psi].
sure (63LS) drops (3 or more minutes after
compressor startup)

When high pressure (63HS1) rises When 63HS1 exceeds

3.62 MPa [525 psi]

When 63HS1 is or below

3.43 MPa [497 psi] and 30 seconds

have passed

Operation

SV9

ON OFF

When high pressure (63HS1) rises during
the heating operation

When startup or resuming operation after a

When 63HS1 exceeds 3.50MPa

[507psi]

ON for 5 minutes and goes OFF

When 63HS1 is or below 2.70Mpa

defrost cycle

Others Always OFF

[391psi]

HWE07010 GB

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[ VII Control ]

-6- Compressor Frequency Control

Depending on the capacity required, the frequency of the compressor is controlled to keep constant evaporation temperature

(0°C [32°F] = 0.71 MPa [103 psi]) during cooling operation, and condensing temperature (49°C [120°F] = 2.88 MPa [418 psi])
during heating operation.

The table below summarizes the operating frequency ranges of the inverter compressor during normal operation.
The OS in the multiple-outdoor-unit system operates at the actual compressor frequency value that is calculated by the OS

based on the preliminary compressor frequency value that the OC determines.

Model

Frequency/cooling (Hz) Frequency/heating (Hz)

Max Min Max Min

200 model 52 15 53 15

250 model 65 15 71 15

300 model 74 15 81 15

350 model 95 15 101 15

400 model 97 15 102 15

450 model 111 15 117 15

The maximum frequency during heating operation is affected by the outdoor air temperature to a certain extent.

(1) Pressure limit

The upper limit of high pressure (63HS1) is preset, and when it exceeds the upper limit, the frequency is decreased every 15
seconds.

The actuation pressure is when the high-pressure reading on 63HS1 is 3.58MPa[519psi].

(2) Discharge temperature limit

Discharge temperature (TH4) of the compressor in operation is monitored, and when it exceeds the upper limit, the frequency
is decreased every minute.

Operating temperature is 115°C [239°F].

(3) Periodic frequency control

Frequency control other than the ones performed at start-up, upon status change, and for protection is called periodic frequen­cy control (convergent control) and is performed in the following manner.

Periodic control cycle

Periodic control is performed after the following time has passed

30 seconds after either compressor start-up or the completion of defrost operation
30 seconds after frequency control based on discharge temperature or pressure limit

The amount of frequency change

The amount of frequency change is controlled to approximate the target value based on the evaporation temperature (Te) and
condensing temperature (Tc).

HWE07010 GB

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[ VII Control ]

-7- Defrost Operation Control

(1) Starting the defrost operation

The defrost cycle starts when the pipe temperature (TH3), in the following table, or below has continuously been detected for

3 minutes after the integrated compressor operation time of 50 minutes have passed.

If 10 minutes have passed since compressor start-up or since the completion of defrost operation, forced defrost operation

will start by turning on the forced defrost switch (DIP SW2-7).

Even if the defrost prohibit timer is set to 90 minutes, the actual defrost prohibit time for the next operation will be 50 minutes

if defrosting took 12 minutes.

In the multiple-outdoor-unit system, all of the outdoor units that are in operation go into the defrost mode simultaneously. The

unit(s) that is stopped at the time defrost operation starts remains stopped.

Model

200 model - 10°C [14°F] - 5°C [23°F]

250 model - 10°C [14°F] - 5°C [23°F]

300 model - 10°C [14°F] - 5°C [23°F]

350 model - 8°C [18°F] - 5°C [23°F]

400 model - 8°C [18°F] - 5°C [23°F]

450 model - 8°C [18°F] - 5°C [23°F]

(2) Defrost operation

Compressor frequency Model Compressor frequency (Real frequency)

Outdoor unit fan Stopped

TH3

SW3 - 3 OFF SW3 - 3 ON

200 model 90 Hz

250 model 90 Hz

300 model 71 Hz

350 model 71 Hz

400 model 103 Hz

450 model 103 Hz

SV1a ON

SV5b, SV5c ON

21S4a OFF

21S4b, 21S4c OFF

SV9 OFF

LEV1 480 pulses

LEV2a 1400 pulses

LEV2b 1400 pulses

HWE07010 GB

- 90 -

[ VII Control ]

(3) Stopping the defrost operation

The defrost cycle ends when 12 minutes have passed since the beginning of the cycle, or when the pipe temperature (TH3),

in the following table, or above has been continuously detected for 4 minutes.

Defrost operation will not stop its operation for 2 minutes once started unless the piping temperature exceeds 25°C [77°F]

within 2 minutes, in which case the operation will stop.

In the multiple-outdoor-unit system, defrosting is stopped on all units at the same time.

Model

TH3

SW3 - 3 OFF SW3 - 3 ON

200 model 10°C [50°F] 15°C [59°F]

250 model 10°C [50°F] 15°C [59°F]

300 model 10°C [50°F] 15°C [59°F]

350 model 7°C [45°F] 12°C [54°F]

400 model 7°C [45°F] 12°C [54°F]

450 mode; 7°C [45°F] 12°C [54°F]

(4) Problems during defrost operation

If a problem is detected during defrost operation, the operation will be stopped, and the defrost prohibition time based on the

integrated compressor operation time will be set to 20 minutes.

(5) Change in the number of operating indoor units during defrost operation

Even when there is a change in the number of operating indoor units during defrost operation, the operation will continue, and

an adjustment will be made after the completion of the defrost operation.

Defrost operation will be continued, even if the indoor units stop or under the Thermo-OFF conditions until it has run its course.

-8- Refrigerant Recovery Control

Recovery of refrigerant is performed during heating operation to prevent the refrigerant from accumulating inside the unit while
it is stopped (unit in fan mode), or inside the indoor unit that is in cooling mode or in heating mode with thermo off. It is also
performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor heat ex­changer.
It is also performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor
heat exchanger.

(1) During heating operation

Starting refrigerant recovery mode

The refrigerant recovery mode in heating starts when all of the following three conditions are met:

15 minutes have passed since the completion of previous refrigerant recovery.
TH4 > 115°C [239°F]
Frequencies below 50 Hz

Refrigerant recovery

1) Refrigerant is recovered with the LEV on the applicable indoor unit (unit under stopping mode, fan mode, cooling, heating with
thermo off) being opened for 30 seconds.

Opening of LEV during refrigerant recovery
Opening of indoor unit LEV: 400 pulses

Initial opening of LEV

Start

30 seconds

Finish

2) Periodic capacity control of the outdoor units and periodic LEV control of the indoor units will be suspended during refrigerant
recovery operation; they will be performed after the recovery has been completed.

HWE07010 GB

- 91 -