Mitsubishi PUHY-EP200, PUHY-EP300, PUHY-EP450YKM-A, PUHY-EP450YSKM-A, PUHY-EP500 Service Handbook

Safety Precautions

Please read the following safety precautions carefully before installing the unit to ensure safety.

Indicates a risk of death or serious injury.

Indicates a risk of serious injury or structural damage.

Make sure that this manual is passed on to the end user to retain for future reference.
Retain this manual for future reference. When the unit is reinstalled or repaired, have this manual available to those who pro-

vide these services. Make sure that this manual is passed on to any future users.

All electric work must be performed by qualified personnel.
Air tightness test must be performed by qualified personnel.

[1] General Precautions

General Precautions

Do not use refrigerant other than the type in­dicated in the manuals provided with the
unit and on the nameplate. Doing so may
cause the unit or pipes to burst, or result in
explosion or fire during use, during repair,
or at the time of disposal of the unit. It may
also be in violation of applicable laws. MIT­SUBISHI ELECTRIC CORPORATION cannot
be held responsible for malfunctions or ac­cidents resulting from the use of the wrong
type of refrigerant.

Do not install the unit in a place where large
amounts of oil, steam, organic solvents, or
corrosive gases, such as sulfuric gas, are
present or where acidic/alkaline solutions
or sprays containing sulfur are used fre­quently. These substances can compro­mise the performance of the unit or cause
certain components of the unit to corrode,
which can result in refrigerant leakage, wa­ter leakage, injury, electric shock, malfunc­tions, smoke, or fire.

Do not try to defeat the safety features of the
unit or make unauthorized setting changes.
Forcing the unit to operate the unit by de­feating the safety features of the devices
such as the pressure switch or the tempera­ture switch, making unauthorized changes
to the switch settings, or using accessories
other than the ones recommended by Mit­subishi Electric may result in smoke, fire, or
explosion.

To reduce the risk of shorting, current leak­age, electric shock, malfunctions, smoke, or
fire, do not splash water on electric parts.

To reduce the risk of electric shock, mal­functions, smoke or fire, do not operate the
switches/buttons or touch other electrical
parts with wet hands.

To reduce the risk of pipe burst and explo­sion, do not allow gas refrigerant and refrig­erant oil to be trapped in the refrigerant
circuit.

To reduce the risk of burns or frost bites, do
not touch the refrigerant pipes or refrigerant
circuit components with bare hands during
and immediately after operation.

To reduce the risk of burns, do not touch
any electrical parts with bare hands during
or immediately after stopping operation.

To reduce the risk of injury from falling
tools, keep children away while installing,
inspecting, or repairing the unit.

Keep the space well ventilated. Refrigerant
can displace air and cause oxygen starva­tion. If leaked refrigerant comes in contact
with a heat source, toxic gas may be gener­ated.

i

Always replace a fuse with one with the cor­rect current rating. The use of improperly
rated fuses or a substitution of fuses with
steel or copper wire may result in bursting,
fire or explosion.

To reduce the risk of electric shock, smoke,
and fire due to infiltration of dust and water,
properly install all required covers and pan­els on the terminal box and control box.

To reduce the risk of injury from units falling
or falling over, periodically check the instal­lation base for damage.

Consult an authorized agency for the proper
disposal of the unit. Refrigerant oil and re­frigerant that may be left in the unit pose a
risk of fire, explosion, or environmental pol­lution.

To reduce the risk of being caught in rotat­ing parts, electric shock, and burns, do not
operate the unit without all required panels
and guards being installed.

To reduce the risk of injury, do not sit,
stand, or place objects on the unit.

To reduce the risk of water leakage and mal­functions, do not turn off the power immedi­ately after stopping operation. Leave the
unit turned on for at least 5 minutes before
turning off the power.

Do not install the unit over things that are
vulnerable to water damage from condensa­tion dripping.

To reduce the risk of injury, electric shock,
and malfunctions, do not touch or allow ca­bles to come in contact with the edges of
components.

To reduce the risk of injury, do not touch the
heat exchanger fins or sharp edges of com­ponents with bare hands.

[2] Transportation and Installation

Always wear protective gears when touch­ing electrical components on the unit. Sev­eral minutes after the power is switched off,
residual voltage may still cause electric
shock.

To reduce the risk of electric shock and
burns, always wear protective gear when
working on units.

To reduce the risk of injury, do not insert fin­gers or foreign objects into air inlet/outlet
grills. If the unit is left on a damaged base, it
may fall and cause injury.

To reduce the risk of injury, always wear
protective gear when working on units.

Do not release refrigerant into the atmo­sphere. Collect and reuse the refrigerant, or
have it properly disposed of by an autho­rized agency. Refrigerant poses environ­mental hazards if released into the air.

Transportation and Installation

Lift the unit by placing the slings at desig­nated locations. Support the outdoor unit
securely at four points to keep it from slip­ping and sliding. If the unit is not properly
supported, it may fall and cause personal
injury.

To reduce the risk of injury, do not carry the
product by the PP bands that are used on
some packages.

To reduce the risk of injury, products weigh­ing 20 kg or more should be carried by two
or more people.

ii

[3] Installation

Installation

Do not install the unit where there is a risk
of leaking flammable gas.

If flammable gas accumulates around the
unit, it may ignite and cause a fire or explo­sion.

To reduce the risk of injury from coming in
contact with units, install units where they
are not accessible to people other than
maintenance personnel.

To reduce the risk of injury, properly dis­pose of the packing materials so that chil­dren will not play with them.

Properly dispose of the packing materials.
Plastic bags pose suffocation hazard to
children.

All drainage work should be performed by
the dealer or qualified personnel according
to the instructions detailed in the Installa­tion Manual. Improper drainage work may
cause water leakage and resultant damage
to the furnishings.

Remove packing materials from the unit be­fore operating the unit. Note that some ac­cessories may be taped to the unit. Properly
install all accessories that are required. Fail­ing to remove the packing materials or fail­ing to install required accessories may
result in refrigerant leakage, oxygen depri­vation, smoke, or fire.

Consult your dealer and take appropriate
measures to safeguard against refrigerant
leakage and resultant oxygen starvation. An
installation of a refrigerant gas detector is
recommended.

Any additional parts must be installed by
the dealer or qualified personnel. Only use
the parts specified by Mitsubishi Electric.
Installation by unauthorized personnel or
use of unauthorized parts or accessories
may result in water leakage, electric shock,
or fire.

Take appropriate safety measures against
wind gusts and earthquakes to prevent the
unit from toppling over and causing injury.

Do not install the unit over things that are
vulnerable to water damage. Provide an ad­equate collective drainage system for the
drain water from unit as necessary.

To reduce the risk of damage to the unit and
resultant electric leak and electric shock,
keep small animals, snow, and rain water
from entering the unit by closing the gap in
the pipe and wire access holes.

[4] Piping Work

Piping Work

To reduce the risk of injury, including frost
bites, that may result from being blasted
with refrigerant, use caution when operat­ing the refrigerant service valve. If refriger­ant leaks out and comes in contact with an
open flame, toxic gases may be generated.

To reduce the risk of injury from units falling
or falling over, install the unit on a surface
that is strong enough to support its weight.

To reduce the risk of rain water or drain wa­ter from entering the room and damaging
the interior, drainage work must be per­formed by your dealer or qualified person­nel according to the instructions detailed in
the Installation Manual.

To reduce the risk of refrigerant catching
fire and causing burns, remove the refriger­ant gas and the residual refrigerant oil in the
pipes before heating them.

iii

To reduce the risk of pipe damage, refriger­ant leakage, and oxygen deprivation, use
pipes that meet the pipe thickness specifi­cations, which vary by the type of refriger­ant used, pipe diameter, and pipe material.

To reduce the risk of pipe burst or explo­sion, evacuate the refrigerant circuit using a
vacuum pump, and do not purge the system
with refrigerant.

To reduce the risk of explosion and deterio­ration of refrigerant oil caused by chloride,
do not use oxygen, flammable gas, or refrig­erant that contains chloride as a pressuriz­ing gas.

To prevent explosion, do not heat the unit
with refrigerant gas in the refrigerant circuit.

To reduce the risk of oxygen deprivation
and gas poisoning, check for gas leakage
and keep fire sources away.

Insulate pipe connections after completing
the air tightness test. Performing an air
tightness test with the pipe being insulated
may lead to failure to detect refrigerant leak­age and cause oxygen deprivation.

To reduce the risk of pipe damage and re­sultant refrigerant leakage and oxygen de­privation, keep the field-installed pipes out
of contact with the edges of components.

To reduce the risk of pipe bursting and ex­plosion due to abnormal pressure rise, do
not allow any substances other than R410A
(such as air) to enter the refrigerant circuit.

[5] Wiring Work

Wiring Work

To reduce the risk of wire breakage, over­heating, smoke, and fire, keep undue force
from being applied to the wires.

To reduce the risk of wire breakage, over­heating, smoke, or fire, properly secure the
cables in place and provide adequate slack
in the cables so as not to stress the termi­nals.

All electric work must be performed by a
qualified electrician according to the local
regulations, standards, and the instructions
detailed in the Installation Manual. Capacity
shortage to the power supply circuit or im­proper installation may result in malfunc­tion, electric shock, smoke, or fire.

To reduce the risk of electric shock, smoke,
or fire, install an inverter circuit breaker on
the power supply to each unit.

To keep the ceiling and floor from getting
wet due to condensation, properly insulate
the pipes.

Use properly rated breakers and fuses (in­verter circuit breaker, local switch <switch +
fuse>, no-fuse breaker). The use of a break­er with a breaking capacity greater than the
specified capacity may cause electric
shock, malfunctions, smoke, or fire.

To reduce the risk of current leakage, over­heating, smoke, or fire, use properly rated
cables with adequate current carrying ca­pacity.

Proper grounding must be provided by a li­censed electrician.

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

To reduce the risk of current leakage, wire
breakage, smoke, or fire, keep the wiring
out of contact with the refrigerant pipes and
other parts, especially sharp edges.

iv

[6] Relocation and Repairs

Relocation and Repairs

To reduce the risk of refrigerant leakage,
water leakage, injury, electric shock, and
fire, units should only be moved or repaired
by your dealer or qualified personnel.

To reduce the risk of wire shorting, electric
shock, malfunctions, or fire, keep circuit
boards dust free, and do not touch them
with your hands or tools.

[7] Additional Precautions

Additional Precautions

To avoid damage to the unit, use appropri­ate tools to install, inspect, or repair the
unit.

To reduce the risk or malfunction, turn on
the power at least 12 hours before starting
operation, and leave the power turned on
throughout the operating season.

Recover all refrigerant in the units, and dis­pose of it properly according to any applica­ble laws and regulations.

Provide a maintenance access to allow for
the inspection of pipes above the ceiling or
the buried pipes.

Take appropriate measures against electri­cal noise interference when installing the air
conditioners in hospitals or facilities with
radio communication capabilities. Inverter,
high-frequency medical, or wireless com­munication equipment as well as power
generators may cause the air conditioning
system to malfunction. Air conditioning
system may also adversely affect the opera­tion of these types of equipment by creating
electrical noise.

To reduce the risk of damage to the unit,
leave the valves on the unit closed until re­frigerant charging is completed.

Place a wet towel on the refrigerant service
valve before brazing the pipes to keep its
temperature from rising above 120ºC and
damaging the surrounding equipment.

To reduce the risk of wire shorting, electric
leak, electric shock, smoke, or fire, do not
perform maintenance work in the rain.

To reduce the risk of injury, electric shock,
and fire, properly reinstall all removed com­ponents after completing repair work.

To reduce the risk of refrigerant and water
leakage, check the pipe supports and insu­lation for damage during inspection or re­pair, and replace or repair the ones that are
found to be deteriorated.

Direct the blazing torch flame away from the
adjacent cables and sheet metal to keep
them from being overheated and damaged.

Prepare tools for exclusive use with R410A.
Do not use the following tools if they have
been used with the conventional refrigerant
(R22): gauge manifold, charging hose, re­frigerant leak detector, check valve, refrig­erant charge spout, vacuum gauge, and
refrigerant recovery equipment. R410A
does not contain chloride, so leak detectors
for use with older types of refrigerants will
not detect an R410A leak. Infiltration of the
residual refrigerant, refrigerant oil, or water
on these tools may cause the refrigerant oil
in the new system to deteriorate or damage
the compressor.

To reduce the risk of the vacuum pump oil
backflowing into the refrigerant cycle and
causing the refrigerant oil to deteriorate,
use a vacuum pump with a check valve.

Have a set of tools for exclusive use with
R410A. Consult your nearest Mitsubishi
Electric Dealer.

Keep dust, dirt, and water off charging hose
and flare tool. Infiltration of dust, dirt, or wa­ter into the refrigerant circuit may cause the
refrigerant oil to deteriorate or damage the
compressor.

v

Use refrigerant piping and couplings that
meet the applicable standards. For refriger­ant pipes, use pipes made of phosphorus
deoxidized copper. Keep the inner and out­er surfaces of pipes and couplings clean
and free of such contaminants as sulfur, ox­ides, dust, dirt, shaving particles, oil, and
moisture. Failure to follow these directions
may result in the deterioration of refrigerant
oil or compressor damage.

Store the piping materials indoors, and
keep both ends of the pipes sealed until im­mediately before brazing. Keep elbows and
other joints in plastic bags. Infiltration of
dust, dirt, or water into the refrigerant cir­cuit may cause the refrigerant oil to deterio­rate or damage the compressor.

Apply ester oil, ether oil, or a small amount
of alkyl benzene to flares and flanges. The
use and accidental infiltration of mineral oil
into the system may cause the refrigerant
oil to deteriorate or damage the compres­sor.

To reduce the risk of both the breaker on the
product side and the upstream breaker from
tripping and causing problems, split the
power supply system or provide protection
coordination between the earth leakage
breaker and no-fuse breaker.

Have a backup system, if failure of the unit
has a potential for causing significant prob­lems or damages.

To reduce the risk of oxidized film from en­tering the refrigerant pipe and causing the
refrigerant oil to deteriorate or damaging
the compressor, braze pipes under nitrogen
purge.

Do not use the existing refrigerant piping. A
large amount of chloride that is contained in
the residual refrigerant and refrigerant oil in
the existing piping may cause the refriger­ant oil in the new unit to deteriorate or dam­age the compressor.

Charge refrigerant in the liquid state. If re­frigerant is charged in the gas phase, the
composition of the refrigerant in the cylin­der will change, compromising the unit's
performance.

Do not use a charging cylinder. The use of a
charging cylinder will change the composi­tion of the refrigerant, compromising the
unit's performance.

Charge the system with an appropriate
amount of refrigerant in the liquid phase.
Refer to the relevant sections in the manu­als to calculate the appropriate amount of
refrigerant to be charged. Refrigerant over­charge or undercharge may result in perfor­mance drop or abnormal stop of operation.

To reduce the risk of power capacity short­age, always use a dedicated power supply
circuit.

vi

CONTENTS

Chapter 1 Piping Work

1-1 Preparation for Piping Work..................................................................................................................3

1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil .......................5

1-3 Working with Refrigerant Piping......................................................................................................... 10

Chapter 2 Restrictions

2-1 System Configurations ........................................................................................................................ 17

2-2 Types and Maximum Allowable Length of Cables ............................................................................ 18

2-3 Switch Settings..................................................................................................................................... 19

2-4 M-NET Address Settings ..................................................................................................................... 20

2-5 Demand Control Overview .................................................................................................................. 26

2-6 System Connection Example ..............................................................................................................28

2-7 Example System with an MA Remote Controller .............................................................................. 30

2-8 Example System with an ME Remote Controller............................................................................... 40

2-9 Example System with an MA and an ME Remote Controller............................................................42

2-10 Restrictions on Refrigerant Pipes ...................................................................................................... 44

Chapter 3 Major Components, Their Functions and Refrigerant Circuits

3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ................................. 51

3-2 Outdoor Unit Refrigerant Circuit Diagrams .......................................................................................56

3-3 Functions of the Major Components of Outdoor Unit ......................................................................57

3-4 Functions of the Major Components of Indoor Unit .........................................................................60

Chapter 4 Electrical Components and Wiring Diagrams

4-1 Outdoor Unit Circuit Board Arrangement .......................................................................................... 63

4-2 Outdoor Unit Circuit Board Components .......................................................................................... 65

4-3 Outdoor Unit Electrical Wiring Diagrams...........................................................................................71

4-4 Transmission Booster Electrical Wiring Diagrams........................................................................... 73

Chapter 5 Control

5-1 Dipswitch Functions and Factory Settings........................................................................................77

5-2 Outdoor Unit Control ...........................................................................................................................83

5-3 Operation Flowcharts ..........................................................................................................................96

Chapter 6 Test Run

6-1 Read before Test Run ........................................................................................................................ 103

6-2 MA and ME Remote Controller Functions and Specifications.......................................................104

6-3 Making the Group and Interlock Settings from an ME Remote Controller ................................... 105

6-4 Selecting Remote Controller Functions from an ME Remote Controller ...................................... 109

6-5 Making Interlock Settings from an MA Remote Controller.............................................................111

6-6 Changing the Room Temperature Detection Position.................................................................... 117

6-7 Test Run Method ................................................................................................................................ 118

6-8 Operation Characteristics and Refrigerant Charge ........................................................................121

6-9 Evaluating and Adjusting Refrigerant Charge.................................................................................121

6-10 The Following Symptoms Are Normal .............................................................................................127

6-11 Standard Operation Data (Reference Data) ..................................................................................... 128

Chapter 7 Troubleshooting Using Error Codes

7-1 Error Code and Preliminary Error Code Lists .................................................................................145

7-2 Error Code Definitions and Solutions: Codes [0 - 999]................................................................... 148

7-3 Error Code Definitions and Solutions: Codes [1000 - 1999]........................................................... 149

7-4 Error Code Definitions and Solutions: Codes [2000 - 2999]........................................................... 153

7-5 Error Code Definitions and Solutions: Codes [3000 - 3999]........................................................... 159

7-6 Error Code Definitions and Solutions: Codes [4000 - 4999]........................................................... 160

7-7 Error Code Definitions and Solutions: Codes [5000 - 5999]........................................................... 173

7-8 Error Code Definitions and Solutions: Codes [6000 - 6999]........................................................... 180

7-9 Error Code Definitions and Solutions: Codes [7000 - 7999]........................................................... 196

HWE12050 GB

CONTENTS

Chapter 8 Troubleshooting Based on Observed Symptoms

8-1 MA Remote Controller Problems ......................................................................................................207

8-2 ME remote Controller Problems .......................................................................................................211

8-3 Refrigerant Control Problems ...........................................................................................................215

8-4 Checking Transmission Waveform and for Electrical Noise Interference .................................... 220

8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ........ 223

8-6 Troubleshooting Solenoid Valve Problems.....................................................................................225

8-7 Troubleshooting Outdoor Unit Fan Problems .................................................................................227

8-8 Troubleshooting LEV Problems........................................................................................................ 228

8-9 Troubleshooting Inverter Problems .................................................................................................234

8-10 Control Circuit .................................................................................................................................... 243

8-11 Measures for Refrigerant Leakage ...................................................................................................246

8-12 Compressor Replacement Instructions ........................................................................................... 248

8-13 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit..................... 250

Chapter 9 LED Status Indicators on the Outdoor Unit Circuit Board

9-1 LED Status Indicators ........................................................................................................................ 253

9-2 LED Status Indicators Table ............................................................................................................. 256

HWE12050 GB

Chapter 1 Piping Work

1-1 Preparation for Piping Work ................................................................................................................ 3

1-1-1 Read before Servicing ............................................................................................................................ 3

1-1-2 Tool Preparation ..................................................................................................................................... 4

1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil...................... 5

1-2-1 Piping Materials ...................................................................................................................................... 5

1-2-2 Storage of Piping Materials..................................................................................................................... 7

1-2-3 Pipe Processing ...................................................................................................................................... 7

1-2-4 Characteristics of the New and Conventional Refrigerants .................................................................... 8

1-2-5 Refrigerant Oil ......................................................................................................................................... 9

1-3 Working with Refrigerant Piping ....................................................................................................... 10

1-3-1 Pipe Brazing.......................................................................................................................................... 10

1-3-2 Air Tightness Test ................................................................................................................................. 11

1-3-3 Vacuum Drying ..................................................................................................................................... 12

1-3-4 Refrigerant Charging............................................................................................................................. 13

HWE12050 GB

- 1 -

HWE12050 GB

- 2 -

[1-1 Preparation for Piping Work ]

CAUTION

1 Piping Work

1-1 Preparation for Piping Work

1-1-1 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 YKM-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.

For information about the correct use of tools, refer to the following page(s). [1-1-2 Tool Preparation](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.

1 Piping Work

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.

HWE12050 GB

- 3 -

[1-1 Preparation for Piping Work ]

1-1-2 Tool Preparation

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

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

Refrigerant Recovery Cylinder Refrigerant recovery

Refrigerant Cylinder Refrigerant charging The refrigerant type is indicated. The

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

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

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

Flare Tool Flare processing Flare processing dimensions for the

high-pressure side

conventional model.

cylinder is pink.

than that of the current port.

may be used.

is attached.

piping in the system using the new re­frigerant differ from those of R22. Re­fer to the following page(s). [1-2-1
Piping Materials](page 5)

Refrigerant Recovery Equipment Refrigerant recovery May be used if compatible with

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

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

R410A.

for pipes that have a diameter of
ø12.7 (1/2") and ø15.88 (5/8") have
been changed.

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

HWE12050 GB

- 4 -

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]

1-2 Handling and Characteristics of Piping Materials,

Refrigerant, and Refrigerant Oil

1-2-1 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

1 Piping Work

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)

HWE12050 GB

- 5 -

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]

Dimension A

Dimension B

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

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

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.

HWE12050 GB

- 6 -

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]

1-2-2 Storage of Piping Materials

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.

1 Piping Work

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.

1-2-3 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.

HWE12050 GB

- 7 -

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]

1-2-4 Characteristics of the New and Conventional 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

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

64.0 42.5 44.4

(25°C,kg/m3/77°F,psi)

Non-azeotropic

Refrigerant

Single Refrigerant

Flammability Nonflammable Nonflammable Nonflammable

Ozone Depletion Coefficient (ODP)

Global Warming Coefficient (GWP)

*1

*2

Refrigerant Charging Method Refrigerant charging in

Replenishment of Refrigerant after a Refrigerant

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 CO2 is used as a reference

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

HWE12050 GB

- 8 -

[1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ]

1-2-5 Refrigerant 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 Piping Work

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

HWE12050 GB

- 9 -

[1-3 Working with Refrigerant Piping ]

1-3 Working with Refrigerant Piping

1-3-1 Pipe 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.

HWE12050 GB

- 10 -

[1-3 Working with Refrigerant Piping ]

1-3-2 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.

1 Piping Work

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.

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) leak.

HWE12050 GB

- 11 -

[1-3 Working with Refrigerant Piping ]

1-3-3 Vacuum Drying

(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.)

HWE12050 GB

- 12 -

[1-3 Working with Refrigerant Piping ]

1-3-4 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 Piping Work

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.

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 the following page(s).[8-11 Measures for Refrigerant Leakage](page 246)

HWE12050 GB

- 13 -

[1-3 Working with Refrigerant Piping ]

HWE12050 GB

- 14 -

Chapter 2 Restrictions

2-1 System Configurations....................................................................................................................... 17

2-2 Types and Maximum Allowable Length of Cables........................................................................... 18

2-3 Switch Settings ................................................................................................................................... 19

2-4 M-NET Address Settings .................................................................................................................... 20

2-4-1 Address Settings List ............................................................................................................................ 20

2-4-2 Outdoor Unit Power Jumper Connector Connection.............................................................................21

2-4-3 Outdoor Unit Centralized Controller Switch Setting .............................................................................. 21

2-4-4 Room Temperature Detection Position Selection ................................................................................. 21

2-4-5 Start/Stop Control of Indoor Units ......................................................................................................... 22

2-4-6 Miscellaneous Settings ......................................................................................................................... 22

2-4-7 Various Control Methods Using the Signal Input/Output Connector on Outdoor Unit .......................... 23

2-5 Demand Control Overview ................................................................................................................. 26

2-6 System Connection Example............................................................................................................. 28

2-7 Example System with an MA Remote Controller ............................................................................. 30

2-7-1 Single Refrigerant System (Automatic Indoor/Outdoor Address Startup) ............................................. 30

2-7-2 Single Refrigerant System with Two or More LOSSNAY Units ............................................................ 32

2-7-3 Grouped Operation of Units in Separate Refrigerant Circuits ............................................................... 34

2-7-4 System with a Connection of System Controller to Centralized Control Transmission Line ................. 36

2-7-5 System with a Connection of System Controller to Indoor-Outdoor Transmission Line ....................... 38

2-8 Example System with an ME Remote Controller ............................................................................. 40

2-8-1 System with a Connection of System Controller to Centralized Control Transmission Line ................. 40

2-9 Example System with an MA and an ME Remote Controller .......................................................... 42

2-9-1 System with a Connection of System Controller to Centralized Control Transmission Line ................. 42

2-10 Restrictions on Refrigerant Pipes ..................................................................................................... 44

2-10-1 Restrictions on Refrigerant Pipe Length ............................................................................................... 44

2-10-2 Restrictions on Refrigerant Pipe Size ................................................................................................... 46

HWE12050 GB

- 15 -

HWE12050 GB

- 16 -

[2-1 System Configurations ]

2 Restrictions

2-1 System Configurations

1. Table of compatible indoor units

(1) High COP combinations

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

Outdoor units Composing units Maximum total

capacity of con-

nectable indoor

units

Maximum

number of

connect-

able indoor

units

EP200 YKM-A - - - 100 - 260 17

EP250 YKM-A - - - 125 - 325 21

EP300 YKM-A - - - 150 - 390 26

EP350 YKM-A - - - 175 - 455 30

YKM-A - - -

EP400

200 - 520 34

YSKM-A EP200 EP200 -

YKM-A - - -

EP450

225 - 585 39

YSKM-A EP250 EP200 -

EP500 YSKM-A EP300 EP200 - 250 - 650 43

EP550 YSKM-A EP300 EP250 - 275 - 715 47

EP600 YSKM-A EP300 EP300 - 300 - 780 50

EP650 YSKM-A EP250 EP200 EP200 325 - 845

EP700 YSKM-A EP300 EP200 EP200 350 - 910

EP750 YSKM-A EP300 EP250 EP200 375 - 975

EP800 YSKM-A EP300 EP300 EP200 400 - 1040

Types of connectable

indoor units

P15 - P200 models
R410A series indoor units

P15 - P400 models
R410A series indoor units

2 Restrictions

P15 - P500 models
R410A series indoor units

EP850 YSKM-A EP300 EP300 EP250 425 - 1105

EP900 YSKM-A EP300 EP300 EP300 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.

HWE12050 GB

- 17 -

[2-2 Types and Maximum Allowable Length of Cables ]

TB 3 TB 7 TB 3 TB

7

TB

3

TB 3 TB

7

TB

7

TB 3 TB

7

TB

3

TB

7

TB 3 TB 7 TB 3 TB

7

TB

3

TB 3 TB

7

TB

7

TB 3 TB

7

TB

3

TB

7

2-core shielded cable

2-core shielded cable

Indoor unit

Outdoor unit

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

Remote Controller

Indoor unit

Outdoor unit

Remote Controller

multiple-core cable

2-2 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) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference.
(Do not 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.

7) When extending the transmission cable, be sure to extend the shield wire.

(2) Control wiring

Different types of control wiring are used for different systems. Before performing wiring work, refer to the following page(s).
[2-7 Example System with an MA Remote Controller](page 30)
[2-8 Example System with an ME Remote Controller](page 40)
[2-9 Example System with an MA and an ME Remote Controller](page 42)

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

Type Shielded cable CVVS, CPEVS, MVVS

Cable type

Number of
cores

Cable size Larger than 1.25mm2 [AWG16]

Maximum transmission
line distance between the
outdoor unit and the far­thest 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)

All facility types

2-core cable

200 m [656ft] max.

HWE12050 GB

- 18 -

[2-3 Switch Settings ]

2) Remote controller wiring

Type CVV CVV

Number of
cores

Cable type

Cable size

Maximum overall line
length

*1 MA remote controller refers to MA remote controller (PAR-31MAA, PAR-21MAA), MA simple remote controller, and

wireless remote controller.
*2 ME 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.
*5 When connecting PAR-31MAA or MA Simple remote controller, use sheathed cables with a minimum thickness of

0.3 mm

2

.

MA remote controller

*1

2-core cable 2-core cable

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

0.3 to 1.25mm
[AWG22 to 16]

2 *3 *5

[AWG18 to 16]

The section of the cable that exceeds 10m

200 m [656ft] max.

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

2

(AWG18) is recommended for easy handling.

ME remote controller

2 *3

*4

*2

2 Restrictions

2-3 Switch Settings

1. Switch setting

The necessary switch settings depend on system configuration. Before performing wiring work, refer to the following page(s).
[2-7 Example System with an MA Remote Controller](page 30)
[2-8 Example System with an ME Remote Controller](page 40)
[2-9 Example System with an MA and an ME Remote Controller](page 42)
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 Outdoor units

ATW Booster Unit BU Outdoor units and Booster Unit

Water Hex Unit AU Outdoor units and Water Hex Unit

Air handling kit IC Outdoor units

unit

ME remote controller Main/sub remote

RC Outdoor units

controller

MA remote controller

*4

Main/sub remote

MA Indoor units

controller

CITY MULTI outdoor unit

*2

OC,OS1,OS2 Outdoor units

*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.
*4. When a PAR-31MAA is connected to a group, no other MA remote controllers can be connected to the same group.
*5. When setting the switch SW4 of the control board, set it with the outdoor unit power on. Refer to the following page(s).

[5-1-1 Outdoor Unit Switch Functions and Factory Settings](page 77)

and Indoor units

*3

and LOSSNAY

*3

or field supplied air handling

*3

*3 *5

HWE12050 GB

- 19 -

[2-4 M-NET Address Settings ]

2-4 M-NET Address Settings

2-4-1 Address Settings List

1. 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*6

Assign the smallest address to the main indoor unit 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 in­terface

Free Plan adapt­er

LOSSNAY, OA processing unit
Air handling kit

ATW Booster Unit

00,
01 to 50

*1*6

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

Water Hex Unit

ME remote con­troller

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

CITY MULTI outdoor unit 00,

Main remote
controller

Sub remote
controller

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

in the same group.

*2

151 to 200

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

remote controllers are connected to the system.)

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

51 to 100

*1,*3,*6

*7

ry set-

ting

00

00

101

Main

00

System controller Group remote

controller

System remote
controller

ON/OFF re­mote 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 con­troller
AG-150A

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.

000

GB-50ADA
G(B)-50A

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

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 ME remote controller address to "200", set the rotary switches to "00".
*3. To set the outdoor unit address to "100," set the rotary 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).

*6. If a given address overlaps any of the addresses that are assigned to other units, use a different, unused address within the

setting range.

*7. When a PAR-31MAA is connected to a group, no other MA remote controllers can be connected to the same group.

HWE12050 GB

- 20 -

[2-4 M-NET Address Settings ]

2-4-2 Outdoor Unit Power Jumper Connector Connection

There are limitations on the total number of units that are connectable to each refrigerant system. Refer to the DATABOOK
for details.

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 connector 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. Some controllers, such as

GB-50ADA, have a function to supply power to the transmission lines.

*2 The replacement of the power jumper connector from CN41 to CN40 must be performed on only one outdoor unit in the

system.

2-4-3 Outdoor Unit Centralized Controller Switch Setting

2 Restrictions

System configuration Centralized control switch (SW5-1) settings *

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

Connection to the system controller Connected *

2

ON

*1 Set SW5-1 on all outdoor units in the same refrigerant circuit to the same setting.
*2 When only the LM adapter is connected, leave SW5-1 to OFF (as it is).

2-4-4 Room Temperature Detection Position Selection

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 the SW1-1 to ON.
(Factory setting: SW1-1 set to "OFF".)

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.

1

HWE12050 GB

- 21 -

[2-4 M-NET Address Settings ]

2-4-5 Start/Stop Control of Indoor Units

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
off (power failure).

*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 cir-

cuits 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

AG-150A, GB-50ADA, or G(B)-50A, set SW1-9 and SW1-10 to ON. With these settings made, the power start-stop func-

tion becomes disabled. To use the auto recovery function after power failure while these settings are made, set SW1-5 to

ON.

Setting (SW1)

910

OFF ON

ON OFF

OFF OFF

*4 *5

2-4-6 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.

HWE12050 GB

- 22 -

[2-4 M-NET Address Settings ]

2-4-7 Various Control Methods Using the Signal Input/Output Connector on Outdoor

Unit

(1) 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.

Low-noise mode

*3*4

(level)

Terminal

to be

*1

used

*2

Option

Adapter for
external input
(PAC­SC36NA-E)

* 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*7

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

Snow sensor signal

CN3S

input (level)

Auto-changeover CN3N

the outdoor unit.

The operation mode of the unit can be changed from normal cool­ing operation (performance priority) to energy-saving cooling mode

Energy-saving
mode

CN3K

by an external signal input.

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

*5

*6

CN51 Adapter for

external out­put
(PAC­SC37SA-E)

*1 For details, refer to section (2) Example of wiring connection.
*2 For details, refer to section (2) Example of wiring connection and other relevant sections in the manual. [2-5 Demand Control

Overview](page 26)

*3 Low-noise mode is valid when Dip SW6-8 on the outdoor unit is set to OFF. When DIP SW6-8 is set to ON, 4 levels of on-

DEMAND are possible, using different configurations of low-noise 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 By setting Dip SW6-7, the Low-noise mode can be switched between the Capacity priority mode and the Low-noise priority

mode.
When SW6-7 is set to ON: The Low-noise mode always remains effective.
When SW6-7 is set to OFF: The Low-noise mode is cancelled when certain outside temperature or pressure criteria are met,
and the unit goes into normal operation (capacity priority mode).

2 Restrictions

Low-noise mode is effective Capacity priority mode becomes effective

Cooling Heating Cooling Heating

TH7 < 30°C [86°F]
and
63HS1 < 32kg/cm

2

TH7 > 3°C [37°F]
and
63LS > 4.6kg/cm

TH7 > 35°C [95°F]

2

or
63HS1 > 35kg/cm

2

TH7 < 0°C [32°F]
or
63LS < 3.9kg/cm

2

*5 If multiple outdoor units are connected to the same refrigerant circuit, signal input/output settings need to be made for each

outdoor unit.
*6 Take out signals from the outdoor unit that is designated as OC if multiple outdoor units in the same system.
*7 If the formula TH7>5 holds true, the fan will not go into operation when the contact receives signal input.

HWE12050 GB

- 23 -

[2-4 M-NET Address Settings ]

CAUTION

(2) Example of wiring connection

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.

(1) 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

X

Y

Preparations

in the field

X

External input
adapter

Y

Maximum cable
length is 10m

1

5
4
3

(3) CN3N

X

Y

External input
adapter

Maximum cable
length is 10m

2

1
2

3

Outdoor unit
control board

CN3N

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

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

Relay circuit

Preparations

in the field

Outdoor unit
control board

CN51

OFF

Y

ON

(2) CN3S

Relay circuit

Preparations

in the field

X : Relay

Snow sensor : The outdoor fan runs when X is closed

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

External input
adapter

X

Maximum cable
length is 10m

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

in stop mode or thermostat mode.

X

OFF

Normal

CoolingONHeating

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

1
2

3

Outdoor unit

2

control board

CN3S

(4) CN3D

Relay circuit

Preparations

in the field

X : Low-noise mode
Y : Compressor ON/OFF
X,Y : Relay

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

External input
adapter

X

Y

Maximum cable
length is 10m

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

1
2

3

Outdoor unit

2

control board

CN3D

Relay circuit

X

Preparations

in the field

X : Low-noise mode

X : Relay

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

Low-noise mode : The noise level is reduced by controlling the maximum

External input
adapter

Maximum cable
length is 10m

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

fan frequency and maximum compressor frequency.

1
2

3

Outdoor unit

2

control board

CN3D

HWE12050 GB

- 24 -

[2-4 M-NET Address Settings ]

(5) CN3K

Relay circuit

Preparations

in the field

X : Energy-saving mode command
X : Relay

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

External input
adapter

X

Maximum cable
length is 10m

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

1
2

3

Outdoor unit

2

control board

CN3K

2 Restrictions

HWE12050 GB

- 25 -

[2-5 Demand Control Overview ]

2-5 Demand Control Overview

(1) General outline of control

Demand control is performed by using the external signal input to the 1-2 and 1-3 pins of CN3D on the outdoor units (OC,

OS1, and OS2).

Between 2 and 12 steps of demand control is possible by setting DIP SW6-8 on the outdoor units (OC, OS1, and OS2).

No Demand control switch

(a) 2 steps(0-100%) OFF OFF OFF OC

(b) 4 steps(0-50-75-100%) ON OFF OFF OC

(c) OFF ON OFF OS1

(d) OFF OFF ON OS2

(e) 8 steps(0-25-38-50-63-75-88-100%) ON ON OFF OC and OS1

(f) ON OFF ON OC and OS2

(g) OFF ON ON OS1 and OS2

(h) 12 steps(0-17-25-34-42-50-59-67-75-

84-92-100%)

*1. Available demand functions

EP200-EP450YKM models (single-outdoor-unit system): 2 and 4 steps shown in the rows (a) and (b) in the table above
only.
EP400-EP600YSKM models (two-outdoor-unit system OC+OS1): 2-8 steps shown in the rows (a), (b), (c), and (e) in the
table above only.
EP650-EP900YSKM models (three-outdoor-unit system OC+OS1+OS2): 2-12 steps shown in the rows (a)-(h) in the table
above.

*2. External signal is input to CN3D on the outdoor unit whose SW6-8 is set to ON. When SW6-8 is set to OFF on all outdoor

units, the signal is input to the CN3D on the OC.
Outdoor units whose SW6-8 is set to ON are selectable in a single refrigerant system.

*3. If wrong sequence of steps are taken, the units may go into the Thermo-OFF (compressor stop) mode.

Ex) When switching from 100% to 50%

(Incorrect) 100% to 0% to 50% : The units may go into the Thermo-OFF mode.
(Correct) 100% to 75% to 50%

*4. 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 actual capacity.

*5. Notes on using demand control in combination with the low-noise mode

To enable the low-noise mode, it is necessary to short-circuit 1-2 pin of CN3D on the outdoor unit whose SW6-8 is set to
OFF.
When SW6-8 is set to ON on all outdoor units, the following operations cannot be performed.

Performing 4-step demand in combination with the low-noise operation in a single-outdoor-unit system.
Performing 8-step demand in combination with the low-noise operation in a two-outdoor-unit system.
Performing 12-step demand in combination with the low-noise operation in a three-outdoor-unit system.

DipSW6-8

Input to CN3D *2

OC OS1 OS2

ON ON ON OC, OS1, and OS2

(2) Contact input and control content

1) SW6-8: OFF (Compressor ON/OFF, Low-noise mode)

CN3D 1-3P Compressor ON/OFF

Open Compressor ON

Close Compressor OFF

CN3D 1-2P Low-noise mode

Open OFF

Close ON

*1. When SW6-8 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 SW6-8 is set to OFF.

HWE12050 GB

*1

*2

- 26 -

[2-5 Demand Control Overview ]

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.
When this function is enabled, the night mode cannot be enabled.

(Wrong)

(Correct)

100%

100%

0%

75%

50%

50%

Demand control

steps

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

(Example) When switching from 100% to 50%

2) When SW6-8 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 SW6-8 is set to ON.

3) When SW6-8 on the two outdoor units in one refrigerant 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%

(*4, *5)

2 Restrictions

*4. Input the order to CN3D on the outdoor unit whose SW6-8 is set to ON.
*5. CN3D of No. 1, 2, 3 can be selected arbitrary with the outdoor unit whose SW6-8 is set to ON.

4) When SW6-8 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%

(*4)

circuit

circuit

Short-

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

circuit

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

*3. Input the order to CN3D on the outdoor unit whose SW6-8 is set to ON.
*4. CN3D of No. 1, 2, 3 can be selected arbitrary with the outdoor unit whose SW6-8 is set to ON.

HWE12050 GB

Short­circuit

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

- 27 -

[2-6 System Connection Example ]

2-6 System Connection Example

Examples of typical system connection are shown below.

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

3

4

5

(2) An example of a system to which an ME remote controller is connected

1

(3) An example of a system to which both MA remote controller and ME remote controller are connected

door unit

System with one out-

door unit

Grouping of units in a

system with multiple

outdoor units

System with one out-

door unit

System with one out-

door unit

System

configuration

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

Connection to the system controller

With connection to transmission line

for centralized control

Address start up for in-

door and outdoor units

Automatic

address setup

Manual

address setup

Manual

address setup

Manual

address setup

Manual

address setup

Address start up for indoor

and outdoor units

Manual

address setup

Notes

Connection of
multiple LOSS­NAY units

Notes

System

configuration

System with one out-

1

*MA remote controller and ME remote controller cannot both be connected to the same group.

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

HWE12050 GB

- 28 -

[2-6 System Connection Example ]

2 Restrictions

HWE12050 GB

- 29 -

[2-7 Example System with an MA Remote Controller ]

2-7 Example System with an MA Remote Controller

2-7-1 Single Refrigerant System (Automatic Indoor/Outdoor Address Startup)

(1) Sample control wiring

Interlock operation with
the ventilation unit

LC

00

TB5

M1 M2 M1 M2 M1 M2

S

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

OS1 OS2

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

00

TB7

TB3

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

S

TB3

TB7

TB3

S

OC

00 00

TB7

L2 L1

Group Group

IC

00

TB5 S TB

S

1 2

L3 L4

IC

00

15

m1

TB5 S TB

15

1 2

L11

m4

A B

MA

(2) Cautions

1) ME 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. It is not possible to connect a
pair of PAR-31MAA.

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) Automatic address setup is not available if start-stop in­put (CN32, CN51, CN41) is used for a group operation of
indoor units or when multiple indoor units with different
functions are grouped in the same group. Refer to the fol­lowing page(s). [2-7-2 Single Refrigerant System with
Two or More LOSSNAY Units](page 32)

5) For information about connecting two or more LOSSNAY
units to a system, refer to the following page(s). [2-7-2
Single Refrigerant System with Two or More LOSSNAY
Units](page 32)

A B

MA

L12 L13

Group Group

IC

A B

RC

IC

A B

MA

00 00

15

TB

TB5

M1 M2 M1 M2 M1 M2

S 1 2

m5

MA

A B

MA

A B

TB5 S TB

15

1 2

A B

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]
*When connecting PAR-31MAA or MA Simple remote
controller, use sheathed cables with a minimum thick­ness of 0.3 mm

2

.

IC

00

TB5 S TB

15

1 2

- 30 -

GBHWE12050

[2-7 Example System with an MA Remote Controller ]

(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), 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 two-wire)

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 two-wire)

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 two-wire)

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.)

For information about certain types of systems (1. Sys-

tems in which the LOSSNAY unit is interlocked with only
part of the indoor units, 2. Systems in which the LOSS­NAY unit is operated independently from the indoor
units, 3. Systems in which more than 16 indoor units are
interlocked with the LOSSNAY unit, and 4. Systems to
which two ore more LOSSNAY units are connected), re­fer to the following page(s). [2-7-2 Single Refrigerant
System with Two or More LOSSNAY Units](page 32)

5) Switch setting
No address settings required.

2 Restrictions

Proce-

dures

Unit or controller

Address setting

range

1 Indoor unit Main unit IC No settings re-

Sub unit IC

quired.

2 LOSSNAY LC No settings re-

quired.

3MA

remote con­troller

Main
remote con­troller

Sub
remote con-

MA No settings re-

quired.

MA Sub

remote controller

troller

4 Outdoor unit (Note) OC

OS1

No settings re­quired.

OS2

Setting

method

Notes

- For information about how

Factory

setting

00
to perform a group opera­tion of indoor units that
feature different functions,
refer to the following
page(s). [2-7-2 Single Re­frigerant System with Two
or More LOSSNAY
Units](page 32)

-00

- It is not possible to con-

Main
nect a pair of PAR­31MAA.

Settings to
be made ac­cording to
the remote
controller
function se­lection

-00

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

HWE12050 GB

31- 31 -

[2-7 Example System with an MA Remote Controller ]

2-7-2 Single Refrigerant System with Two or More LOSSNAY Units

(1) Sample control wiring

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

L1

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

53

TB7

TB7

TB3

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

TB3

S

TB3

S

L2

OC OS1 OS2

IC

01

51 52

TB7

S

TB5 S TB

M1 M2 M1 M2 M1 M2

L3 L4

Group Group

IC

02

15

1 2

m1

TB5 S TB

15

1 2

Interlock operation with
the ventilation unit

LC

05

TB5

S

L11

(2) Cautions

1) ME 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. It is not possible to connect a
pair of PAR-31MAA.

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.

Refer to the DATABOOK for further information about

how many booster units are required for a given system.

A B

MA

L12 L13

Group

IC

A B

MA

IC

04 03

TB5

S

15

TB

1 2

A B

MA

m2

m3

TB5 S TB

15

1 2

(3) Maximum allowable length

1) Indoor/outdoor transmission line
Same as 2-7-1

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

3) MA remote controller wiring
Same as 2-7-1

M1 M2 M1 M2 M1 M2

TB5

LC

06

S

- 32 -

GBHWE12050

[2-7 Example System with an MA Remote Controller ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as 2-7-1

Shielded cable connection

Same as 2-7-1

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

3) MA remote controller wiring
Same as 2-7-1

When 2 remote controllers are connected to the sys­tem

Same as 2-7-1

Group operation of indoor units

Same as 2-7-1

4) LOSSNAY connection

(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

2 LOSSNAY LC 01 to 50 Assign an arbitrary but

3MA

remote con­troller

Main
remote
control-

MA No

settings re­quired.

ler

range

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 two-wire)

Interlock setting between the indoor units and LOSS-

NAY units must be entered on the remote controller. For
information about how to interlock the operation of indoor
and LOSSNAY units, refer to the following page(s) in this
Service Handbook.

[6-5 Making Interlock Settings from an MA Remote Con­troller](page 111)

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,

designate the indoor unit

starting with the address of
the main unit in the same
group +1. (Main unit ad-

in the group with the great-

est number of functions as

the main unit.

dress +1, main unit ad­dress +2, main unit
address +3, etc.)

None of these addresses
unique address to each of
these units after assigning

may overlap any of the in-

door unit addresses.
an address to all indoor
units.

- It is not possible to con­nect a pair of PAR­31MAA.

Factory

setting

00

00

Main

2 Restrictions

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 the rotary switches to

50.

00

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.
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).

HWE12050 GB

33- 33 -

[2-7 Example System with an MA Remote Controller ]

2-7-3 Grouped Operation of Units in Separate Refrigerant Circuits

(1) Sample control wiring

Interlock operation with

L11

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

OS2

53

TB3

M1 M2 M1 M2 M1 M2

TB7

M1 M2 M1 M2 M1 M2

S

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

To be left
unconnected

OS1

52

TB3

TB7

S

To be left
unconnected

Move the male connector
from CN41 to CN40.

SW5-1 OFF

OC

51

TB3

TB7

S

To be connected

L12

m2

Group

IC

03

TB5 S TB

15

1 2

A B

Group

IC

01

15

TB5 S TB

1 2

M1 M2 M1 M2 M1 M2 M1 M2

A B

the ventilation unit

Group

IC

06

TB5 S TB

m1

15

1 2

A B

TB5

LC

07

S

L31

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

OS2

56

TB3

M1 M2 M1 M2 M1 M2

TB7

M1 M2 M1 M2 M1 M2

S

To be left
unconnected

L21

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

55

TB3

TB7

OS1

S

Leave the male
connector on
CN41 as it is.

SW5-1 OFF

To be left
unconnected

54

TB3

TB7

OC

S

To be left
unconnected

TB5

M1 M2

(2) Cautions

1) ME 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. It is not possible to connect a
pair of PAR-31MAA.

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.

Refer to the DATABOOK for further information about

how many booster units are required for a given system.

MA

m3

L22

IC

TB

15

S

1 2

Group

MA

IC

04 02

TB5 S TB

15

1 2 1 2

m4

A B

MA

MA

IC

05

TB5 TB15

S

M1 M2 M1 M2

m5

(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
L21+L31 200m [656ft]

3) MA remote controller wiring
Same as 2-7-1

4) Maximum line distance via outdoor unit
(1.25mm

2

[AWG16] or larger)

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

- 34 -

GBHWE12050

[2-7 Example System with an MA Remote Controller ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as 2-7-1

Only use shielded cables.

Shielded cable connection

Same as 2-7-1

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 (Note a) 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.

a) The outdoor units in the same refrigerant circuit are auto-

matically 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).

b) When not daisy-chaining TB7's on the outdoor units in

the same refrigerant circuit, connect the transmission
line for centralized control to TB7 on the OC (Note a). To
maintain centralized control even during an OC failure or

(5) Address setting method

a power failure, daisy-chain TB7 of OC, OS1, and OS2.
(If there is a problem with the outdoor unit whose power
jumper was moved from CN41 to CN40, centralized con­trol is not possible, even if TB7's are daisy-chained).

c) When connecting TB7, only commence after checking

that the voltage is below 20 VDC.

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 2-7-1

When 2 remote controllers are connected to the sys­tem

Same as 2-7-1

Group operation of indoor units

Same as 2-7-1

4) LOSSNAY connection
Same as 2-7-2

5) Switch setting
Address setting is required as follows.

2 Restrictions

Proce-

dures

1 Indoor

Unit or controller

Main unit IC 01 to 50 Assign the smallest ad-

unit

Address setting

range

Setting method Notes

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

- It is not possible to

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.

connect a pair of PAR­31MAA.

To set the address to
100, set the rotary
switches to 50.

Factory

setting

00

00

Main

00

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

HWE12050 GB

35- 35 -

[2-7 Example System with an MA Remote Controller ]

IC

TB5 S TB

15

1 2

01

IC

TB5 S TB

15

1 2

02

A B

MA

A B

MA

LC

TB5

S

07

IC

TB5

S

1 2

TB

15

IC

TB5 S TB

15

1 2

05 04

LC

TB5

S

08

IC

TB5 S TB

15

1 2

03

A B

MA

IC

TB5 S TB

15

1 2

06

A B

MA

A B

MA

M1 M2 M1 M2 M1 M2 M1 M2

M1 M2 M1 M2 M1 M2 M1 M2

L12 L11

L22 L21

m3

L31

A B S

L32

Note1

System controller

OC

TB3

TB7

S

51

To be connected

To be left
unconnected

To be left
unconnected

m2 m1

OS1

TB3

TB7

S

52

OS2

TB3

TB7

M1 M2 M1 M2 M1 M2

M1 M2 M1 M2 M1 M2

S

53

OC

TB3

TB7

S

54

OS1

TB3

TB7

S

55

OS2

TB3

TB7

M1 M2 M1 M2 M1 M2

M1 M2 M1 M2 M1 M2

S

56

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

SW5-1 OFF ON

Group Group Group

Group Group

Interlock operation with
the ventilation unit

Note1 When only the LM adapter is connected,
leave SW5-1 to OFF (as it is).
Note2 LM adapters require the power supply
capacity of single-phase AC 220/240V.

To be left
unconnected

To be left
unconnected

To be left
unconnected

Move the male connector
from CN41 to CN40.

2-7-4 System with a Connection of System Controller to Centralized Control

Transmission Line

(1) Sample control wiring

An example of a system in which a system controller is connected to the transmission cable for the centralized control system
and the power is supplied from the outdoor unit

(2) Cautions

1) ME 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. It is not possible to connect a pair of PAR­31MAA.

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 (not required if power
to the transmission line for centralized control is supplied from a
controller with a power supply function, such as GB-50ADA).

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.

Refer to the DATABOOK for further information about how

many booster units are required for a given system.

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).

(3) Maximum allowable length

1) Indoor/outdoor transmission line
Same as 2-7-3

2) Transmission line for centralized control
L31+L32(L21) 200m [656ft]

3) MA remote controller wiring
Same as 2-7-1

4) Maximum line distance via outdoor unit
(1.25mm

2

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

- 36 -

[AWG16] or larger)

GBHWE12050

[2-7 Example System with an MA Remote Controller ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as 2-7-1
Only use shielded cables.

Shielded cable connection

Same as 2-7-1

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. (Note b)
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 (SW5-1) on the control board of all outdoor units
to "ON."

a) The outdoor units in the same refrigerant circuit are auto-

matically 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).

b) When not daisy-chaining TB7's on the outdoor units in

the same refrigerant circuit, connect the transmission
line for centralized control to TB7 on the OC (Note a). To
maintain centralized control even during an OC failure or
a power failure, daisy-chain TB7 of OC, OS1, and OS2.
(If there is a problem with the outdoor unit whose power

(5) Address setting method

jumper was moved from CN41 to CN40, centralized con­trol is not possible, even if TB7's are daisy-chained).

c) When connecting TB7, only commence after checking

that the voltage is below 20 VDC.

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 2-7-1

When 2 remote controllers are connected to the sys­tem

Same as 2-7-1

Group operation of indoor units

Same as 2-7-1

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.

2 Restrictions

Proce-

dures

Unit or controller

Address

setting

range

Setting method Notes

1 Indoor unit Main unit IC 01 to 50 Assign the smallest address

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 assigning
an address to all indoor units.

3MA

remote
controller

Main
remote
control-

MA No

settings re­quired.

- Enter the same indoor

ler
Sub

remote
control-

MA Sub

remote con­troller

Settings to be made accord­ing to the remote controller
function selection

ler

4 Outdoor unit OC

51 to 100 Assign sequential address to
OS1
OS2

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.
It is not possible to con­nect a pair of PAR­31MAA.

To set the address to 100,
set the rotary switches to

50.

Factory

setting

00

00

Main

00

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

HWE12050 GB

37- 37 -

[2-7 Example System with an MA Remote Controller ]

IC

TB5 S TB

15

1 2

01

IC

TB5 S TB

15

1 2

02

A B

MA

A B

MA

LC

TB5

S

07

IC

TB5

S

1 2

TB

15

IC

TB5 S TB

15

1 2

05 04

LC

TB5

S

08

IC

TB5 S TB

15

1 2

03

A B

MA

IC

TB5 S TB

15

1 2

06

A B

MA

A B

MA

M1 M2 M1 M2 M1 M2 M1 M2

M1 M2

M1 M2

M1 M2 M1 M2

L12 L11

L22 L21

m3

OC

TB3

TB7

S

51

m2 m1

OS1

TB3

TB7

S

52

OS2

TB3

TB7

M1 M2 M1 M2 M1 M2

M1 M2 M1 M2 M1 M2

S

53

OC

TB3

TB7

S

54

OS1

TB3

TB7

S

55

OS2

TB3

TB7

M1 M2 M1 M2 M1 M2

M1 M2 M1 M2 M1 M2

S

56

L31

A B S

L25

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

Note1

System controller

SW5-1 OFF ON

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

Move the male connector
from CN41 to CN40.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

Group Group Group

Group Group

Interlock operation with
the ventilation unit

To be left
unconnected

To be left
unconnected

To be left
unconnected

To be left
unconnected

To be left
unconnected

To be connected

2-7-5 System with a Connection of System Controller to Indoor-Outdoor

Transmission Line

(1) Sample control wiring

(2) Cautions

1) ME 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. It is not possible to connect a pair of
PAR-31MAA.

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 (not required
if power to the transmission line for centralized control is
supplied from a controller with a power supply function, such
as GB-50ADA).

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 three system controllers can be connected to
the indoor-outdoor transmission line. (AG-150A, GB­50ADA, or G(B)-50A are not connectable.)

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

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.

Refer to the DATABOOK for further information about how

many booster units are required for a given system.

(3) Maximum allowable length

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

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

L31+L21 200m [656ft]

2) Transmission line for centralized control

3) MA remote controller wiring
Same as 2-7-1

4) Maximum line distance via outdoor unit
(1.25mm

L25+L31+L12(L11) 500m [1640ft]
L12(L11)+L31+L22(L21) 500m [1640ft]

2

[AWG16] or larger)

- 38 -

2

[AWG16] or larger)

GBHWE12050

[2-7 Example System with an MA Remote Controller ]

(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 a), 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.

a) The outdoor units in the same refrigerant circuit are auto-

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

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.
(Note b)
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.
Set the central control switch (SW5-1) on the control
board of all outdoor units to "ON."

b) When not daisy-chaining TB7's on the outdoor units in the

(5) Address setting method

same refrigerant circuit, connect the transmission line for
centralized control to TB7 on the OC (Note a). To maintain
centralized control even during an OC failure or a power fail­ure, daisy-chain TB7 of OC, OS1, and OS2. (If there is a
problem with the outdoor unit whose power jumper was
moved from CN41 to CN40, centralized control is not possi­ble, even if TB7's are daisy-chained).

c) When connecting TB7, only commence after checking that

the voltage is below 20 VDC.

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 2-7-1

When 2 remote controllers are connected to the sys­tem

Same as 2-7-1

Group operation of indoor units

Same as 2-7-1

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 two­wire)

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.

2 Restrictions

Proce-

dures

1 Indoor

Unit or controller

Main unit IC 01 to 50

Address set-

unit

Sub unit

2 LOSSNAY LC 01 to 50

3MA

remote
control­ler

4 Outdoor unit OC

Main
remote
controller

Sub
remote
controller

MA No

settings re­quired.

MA Sub

remote con­troller

51 to 100 Assign sequential address to
OS1
OS2

ting range

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.)

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

-

Settings to be made accord­ing to the 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.

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

Enter the same indoor unit
group settings on the system
controller as the ones that were
entered on the MA remote con­troller.
It is not possible to connect a
pair of PAR-31MAA.

function selection

To set the address to 100,

the outdoor units in the same

set the rotary switches to 50.
refrigerant circuit.
The outdoor units are auto­matically designated as OC,
OS1, and OS2. (Note)

Factory

setting

00

00

Main

00

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

HWE12050 GB

39- 39 -

[2-8 Example System with an ME Remote Controller ]

IC

TB5 S TB

15

1 2

01

IC

TB5 S TB

15

1 2

02

LC

TB5

S

07

IC

TB5

S

1 2

TB

15

IC

TB5 S TB

15

1 2

05 04

LC

TB5

S

08

IC

TB5 S TB

15

1 2

03

IC

TB5 S TB

15

1 2

06

A B

RC

101

A B

RC

102

A B

RC

103

Group

Group

Group Group Group

M1 M2 M1 M2 M1 M2 M1 M2

M1 M2 M1 M2 M1 M2 M1 M2

L12 L11

L22 L21

L31

A B S

L32

Note1

System controller

Interlock operation with
the ventilation unit

OC

TB3

TB7

S

51

m1

OS1

TB3

TB7

S

52

OS2

TB3

TB7

M1 M2 M1 M2 M1 M2

M1 M2 M1 M2 M1 M2

S

53

OC

TB3

TB7

S

54

OS1

TB3

TB7

S

55

OS2

TB3

TB7

M1 M2 M1 M2 M1 M2

M1 M2 M1 M2 M1 M2

S

56

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

SW5-1 OFF ON

Move the male connector
from CN41 to CN40.

To be connected

To be left
unconnected

To be left
unconnected

To be left
unconnected

To be left
unconnected

To be left
unconnected

104

A B

RC

154

A B

RC

m3

106

A B

RC

m2

Note1 When only the LM adapter is connected,
leave SW5-1 to OFF (as it is).
Note2 LM adapters require the power supply
capacity of single-phase AC 220/240V.

2-8 Example System with an ME Remote Controller

2-8-1 System with a Connection of System Controller to Centralized Control

Transmission Line

(1) Sample control wiring

(2) Cautions

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

2) No more than 3 ME 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 (not required if power
to the transmission line for centralized control is supplied from a
controller with a power supply function, such as GB-50ADA).

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.

Refer to the DATABOOK for further information about how

many booster units are required for a given system.

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 2-7-3

Same as 2-7-4

3) M-NET remote controller wiring

Maximum overall line length
(0.3 to 1.25mm
m1 10m [32ft]
m2+m3 10m [32ft]
If the standard-supplied cable must be extended, use a cable
with a diameter of 1.25mm
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

4) Maximum line distance via outdoor unit
(1.25 mm

2

[AWG16] min.)

2) Transmission line for centralized control

2

[AWG22 to 16])

Same as 2-7-4

- 40 -

2

[AWG16]. The section of the cable

2

[AWG18-14].

GBHWE12050

[2-8 Example System with an ME Remote Controller ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as 2-7-1

Shielded cable connection

Same as 2-7-1

2) Transmission line for centralized control
Same as 2-7-4

Shielded cable connection

Same as 2-7-4

3) ME remote controller wiring
ME remote controller is connectable anywhere on the in-

door-outdoor transmission line.

(5) Address setting method

Proce-

dures

1 Indoor

Unit or controller

Main unit IC 01 to 50 Assign the smallest ad-

Address setting

unit

Sub unit Assign sequential num-

2 LOSSNAY LC 01 to 50 Assign an arbitrary but

3ME re-

mote
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

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 2-7-4

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, desig-

bers starting with the ad­dress 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 the rota-

address in the group

ry switches to 00.

Factory

setting

00

00

101

2 Restrictions

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 the rotary
switches to 50.

00

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.
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).

HWE12050 GB

41- 41 -

[2-9 Example System with an MA and an ME Remote Controller ]

2-9 Example System with an MA and an ME Remote Controller

2-9-1 System with a Connection of System Controller to Centralized Control

Transmission Line

(1) Sample control wiring

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

TB3

M1 M2 M1 M2 M1 M2

L11 L12

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

TB3

Move the male connector
from CN41 to CN40.

SW5-1 OFF ON

OC OS1 OS2

51 52 53

TB3

Group

IC

01

TB5 TB

M1 M2

S

15

1 2

TB5 TB

M1 M2

S

IC

02

15

1 2

Group

06

TB5 TB

M1 M2

S

IC

15

1 2

L31

TB7

M1 M2 M1 M2 M1 M2

S

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

OS2

56

TB3

M1 M2 M1 M2 M1 M2

TB7

S

M1 M2 M1 M2 M1 M2

TB7

To be left
unconnected

To be left
unconnected

S

To be left
unconnected

L21 L22

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

OS1

55

TB3

TB7

S

To be left
unconnected

TB7

To be connected

Leave the male
connector on
CN41 as it is.

SW5-1 OFF ON

OC

54

TB3

TB7

S

S

To be left
unconnected

L32

System controller

A B S

Note1

TB5

M1 M2

A B

A B

106

MA

IC

Group Group

IC

04 03

15

TB

15

S

1 2

A B

MA

TB5 TB

M1 M2

S

1 2

A B

104

RC

Note1 When only the LM adapter is connected,
leave SW5-1 to OFF (as it is).

Note2 LM adapters require the power supply
capacity of single-phase AC 220/240V.

05

TB5 TB

M1 M2

S

RC

IC

15

1 2

(2) Cautions

1) Be sure to connect a system controller.

2) ME 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 ME remote control­ler.

4) No more than 2 ME 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. It is not possible to connect a
pair of PAR-31MAA.

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

7) Replacement of male power jumper connector (CN41)
must be performed only on one of the outdoor units (not
required if power to the transmission line for centralized
control is supplied from a controller with a power supply
function, such as GB-50ADA).

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.

Refer to the DATABOOK for further information about

how many booster units are required for a given system.

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 2-7-3

2) Transmission line for centralized control
Same as 2-7-4

3) MA remote controller wiring
Same as 2-7-1

4) M-NET remote controller wiring
Same as 2-7-1

5) Maximum line distance via outdoor unit
(1.25 mm

2

[AWG16] min. )

Same as 2-7-4

- 42 -

GBHWE12050

[2-9 Example System with an MA and an ME Remote Controller ]

(4) Wiring method

1) Indoor/outdoor transmission line
Same as 2-7-1

Shielded cable connection

Same as 2-7-1

2) Transmission line for centralized control
Same as 2-7-4

Shielded cable connection

Same as 2-7-4

3) MA remote controller wiring
Same as 2-7-1

When 2 remote controllers are connected to the sys­tem

(5) Address setting method

Proce-

dures

1 Opera-

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

2 Opera-

tion
with the
ME re­mote

In­door
unit

Main unit IC 01 to 50 Assign the smallest ad-

Sub unit

control­ler

ME re­mote
con­troller

Main re-

mote con-

troller

Sub

RC 101 to

RC 151 to
remote
controller

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 2-7-1

Group operation of indoor units

Same as 2-7-1

4) M-NET remote controller wiring
Same as 2-7-1

When 2 remote controllers are connected to the sys­tem

Same as 2-7-1

Group operation of indoor units

Same as 2-7-1

5) LOSSNAY connection
Same as 2-7-4

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.)

-

Assign an address smaller

than that of the indoor unit
that is connected to the ME
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
functions as the main unit.

It is not possible to connect
a pair of PAR-31MAA.

Settings to be made ac­cording to the remote con­troller function selection

Enter the indoor unit group

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.

Add 150 to the main unit

settings 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 the rotary switches to

00.

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 the rotary switches to 50.

Factory

setting

2 Restrictions

00

Main

00

101

00

00

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

HWE12050 GB

43- 43 -

[2-10 Restrictions on Refrigerant Pipes ]

2-10 Restrictions on Refrigerant Pipes

2-10-1 Restrictions on Refrigerant Pipe Length

(1) EP200 - EP450YKM 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

Unit: m [ft]

Allowable length of

pipes

1000 [3280] or less

165 [541] or less

(Equivalent length 190

[623] or less)

40 [131] or less

*1

*2

*1. If the piping length exceeds 40 meters (but does not exceed 90 meters), use one-size larger pipes for indoor unit

liquid pipes. Depending on the vertical separation between indoor and outdoor units, it may not be necessary to
upgrade the pipe size. Consult your dealer for more information.

*2. If the piping length exceeds 15 meters (but does not exceed 30 meters), use one-size larger pipes for indoor unit

liquid pipes.

HWE12050 GB

- 44 -

[2-10 Restrictions on Refrigerant Pipes ]

(2) EP400 - EP900YSKM 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 [6ft]

2m [6ft] Max.

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)

To downstream units

To indoor unit
Joint pipe

Allowable length of

pipes

Outdoor unit Outdoor unit

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.

Outdoor unit

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

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 ( )

Height
difference

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

2 Restrictions

Unit: m [ft]

*1

*2

*1. If the piping length exceeds 40 meters (but does not exceed 90 meters), use one-size larger pipes for indoor unit

liquid pipes. Depending on the vertical separation between indoor and outdoor units, it may not be necessary to
upgrade the pipe size. Consult your dealer for more information.

*2. If the piping length exceeds 15 meters (but does not exceed 30 meters), use one-size larger pipes for indoor unit

liquid pipes.

HWE12050 GB

- 45 -

[2-10 Restrictions on Refrigerant Pipes ]

2-10-2 Restrictions on 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"] ø22.2 [7/8"]

250 model ø9.52 [3/8"]

300 model ø9.52 [3/8"]

*1

*2

ø22.2 [7/8"]

ø28.58 [1-1/8"]

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 - 900 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"]

HWE12050 GB

- 46 -

[2-10 Restrictions on Refrigerant Pipes ]

(3) Size of the refrigerant pipe between the branches for connection to indoor 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"]

(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]

200 model ø9.52 [3/8"] ø22.2 [7/8"]

250 model

2 Restrictions

300 model ø12.7 [1/2"] ø28.58 [1-1/8"]

350 model

400 model ø15.88 [5/8"]

450 model

*EP200-EP450YKM models only

HWE12050 GB

- 47 -

[2-10 Restrictions on Refrigerant Pipes ]

HWE12050 GB

- 48 -

Chapter 3 Major Components, Their Functions and Refrigerant Circuits

3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit................................ 51

3-1-1 External Appearance of Outdoor Unit ................................................................................................... 51

3-1-2 Outdoor Unit Refrigerant Circuits .......................................................................................................... 53

3-2 Outdoor Unit Refrigerant Circuit Diagrams...................................................................................... 56

3-3 Functions of the Major Components of Outdoor Unit..................................................................... 57

3-4 Functions of the Major Components of Indoor Unit........................................................................ 60

HWE12050 GB

- 49 -

HWE12050 GB

- 50 -

[3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ]

Fan guardFan guard

FanFan

Control boxControl box

Heat exchangerHeat exchanger

Front panelsFront panels

Fin guardFin guard

Side panelsSide panels

3 Major Components, Their Functions and Refrigerant Circuits

3-1 External Appearance and Refrigerant Circuit Components of

Outdoor Unit

3-1-1 External Appearance of Outdoor Unit

(1) PUHY-EP200, EP250YKM-A

3 Major Components, Their Functions and Refrigerant Circuits

HWE12050 GB

- 51 -

[3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ]

Fan boxFan box

Fan guardsFan guards

FansFans

Control boxControl box

Heat exchangerHeat exchanger

Front panelsFront panels

Fin guardFin guard

Side panelSide panel

Side panelSide panel

(2) PUHY-EP300, EP350, EP400, EP450YKM-A

HWE12050 GB

- 52 -

[3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ]

Low-pressure sensor (63LS)

High-pressure sensor (63HS1)

High-pressure switch (63H1)

Accumulator

Low-pressure check joint

High-pressure check joint

Compressor cover

Solenoid valve (SV2)

Linear expansion valve

(LEV1)

Linear expansion valve

(LEV2)

Subcool coil

4-way valve

(21S4b)

4-way valve

(21S4a)

Check valve

Compressor

Oil separator

Solenoid valve (SV1a)

2-way valve (SV5b)

Gas-side valve

Lliquid-side valve

Solenoid valve (SV9)

Check valve

3-1-2 Outdoor Unit Refrigerant Circuits

(1) PUHY-EP200YKM-A

3 Major Components, Their Functions and Refrigerant Circuits

HWE12050 GB

- 53 -

[3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ]

Low-pressure sensor (63LS)

High-pressure sensor (63HS1)High-pressure switch (63H1)

Accumulator

Low-pressure check joint

High-pressure check joint

Compressor cover

Solenoid valve (SV2)

Linear expansion valve

(LEV1)

Linear expansion valve

(LEV2)

Subcool coil

4-way valve (21S4a)

4-way valve (21S4b)

Check valve

Compressor

Oil separatorSolenoid valve (SV1a)

2-way valve (SV5b)

Gas-side valveLliquid-side valve

Solenoid valve (SV9)

Check valve

(2) PUHY-EP250YKM-A

HWE12050 GB

- 54 -

[3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ]

Low-pressure sensor (63LS)

High-pressure sensor (63HS1)

High-pressure switch (63H1)

Accumulator

Low-pressure check joint

High-pressure
check joint

Compressor cover

Solenoid

valve (SV2)

Linear expansion valve

(LEV1)

Linear expansion valve

(LEV2)

Subcool coil

4-way valve

(21S4b)

4-way valve (21S4a)

4-way valve (21S4c)

Check valve

Compressor

Oil separator

Solenoid valve (SV1a)

2-way valve

(SV5b)

2-way valve (SV5c)

Gas-side valve

Lliquid-side valve

Solenoid valve

(SV9)

(3) PUHY-EP300, EP350, EP400, EP450YKM-A

3 Major Components, Their Functions and Refrigerant Circuits

HWE12050 GB

- 55 -

[3-2 Outdoor Unit Refrigerant Circuit Diagrams ]

SCC

LEV1

SV1a

63H1

ST3

ST6

63HS1

CJ2

ST7

21S4b

CP1

CJ1

63LS

SV5b

CV1

ST1

ST2

BV2

BV1

SV9

ACC

Comp

O/S

HEX

*

FAN

21S4a

MOTOR

LEV2

CV2

CP2

SV2

TH4

TH2

TH3

TH7

TH6

TH5

*

**

*

*

SCC

LEV1

ACC

63H1

21S4a

ST6

63HS1

ST7

21S4c

CJ1

63LS

SV5c

Comp

O/S

CV1

LEV2

ST2

BV2

BV1

21S4b

SV5b

SV9

ST1

*

FAN2

（HEX2）

FAN1

（HEX1）

CJ2

CV2

CP2

SV2

SV1a

ST3

CP1

HEX2

TH7

TH2

HEX1

TH3

TH6

TH4

TH5

MOTOR

MOTOR

*

**

*

*

3-2 Outdoor Unit Refrigerant Circuit Diagrams

(1) PUHY-EP200, EP250 models

(2) PUHY-EP300, EP350, EP400, EP450 models

- 56 -

HWE12050 GB

[3-3 Functions of the Major Components of Outdoor Unit ]

Pressure
0~4.15 MPa [601psi]
Vout 0.5~3.5V

0.071V/0.098 MPa [14psi]
Pressure [MPa]
=1.38 x Vout [V]-0.69
Pressure [psi]
=(1.38 x Vout [V] - 0.69) x 145

GND (Black)
Vout (White)
Vcc (DC5V) (Red)

Con­nector

63HS1

1

123

2
3

3-3 Functions of the Major Components of 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

EP200, EP200 models
Low-pressure shell scroll
compressor
wirewound resistance
20°C [68°F] : 0.71 

EP300, EP350 models
Low-pressure shell scroll
compressor
wirewound resistance
20°C [68°F] : 0.32 

EP400, EP450 models
Low-pressure shell scroll
compressor
wirewound resistance
20°C [68°F] : 0.30 

Pressure

63LS

0~1.7 MPa [247psi]
Vout 0.5~3.5V

123

0.173V/0.098 MPa [14psi]

Con­nector

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

HWE12050 GB

63H1 1) Detects high pressure

2) Provides high-pressure pro­tection

- 57 -

4.15MPa[601psi] OFF setting

3 Major Components, Their Functions and Refrigerant Circuits

[3-3 Functions of the Major Components of Outdoor Unit ]

R = 7.465k

120

R = 4057
R =

7.465

25/120

t

4057

273 t

1

393

1

exp

R = 15k

0

R = 3460
R = 15

0/80

t

3460

273 t

1

273

1

exp

R = 17k

50

R = 4016
R = 17

25/120

t

4016

273 t

1

323

1

exp

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] :698 k
10°C[50°F] :413 k
20°C[68°F] :250 k
30°C[86°F] :160 k
40°C[104°F] :104 k
50°C[122°F] : 70 k
60°C[140°F] : 48 k
70°C[158°F] : 34 k
80°C[176°F] : 24 k
90°C[194°F] :17.5 k
100°C[212°F] :13.0 k
110°C[230°F] : 9.8 k

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 LEV2 are controlled based on the

63LS and TH5 values.

TH6 Controls LEV1 based on TH2,

TH3, and TH6 data.

THHS
Inverter

Controls inverter cooling fan

based on THHS temperature
heat sink
temperature

Degrees Celsius Resistance check

Degrees Celsius

Resistance check

0°C[32°F] :15 k
10°C[50°F] :9.7 k
20°C[68°F] :6.4 k
25°C[77°F] :5.3 k
30°C[86°F] :4.3 k
40°C[104°F] :3.1 k

Degrees Celsius

HWE12050 GB

0°C[32°F] :161 k
10°C[50°F] :97 k
20°C[68°F] :60 k
25°C[77°F] :48 k
30°C[86°F] :39 k
40°C[104°F] :25 k

- 58 -

[3-3 Functions of the Major Components of Outdoor Unit ]

Yellow

White

Orange

Brown Blue

M

Part

name

Sole­noid
valve

Linear
expan­sion
valve

Symbols

(functions)

SV1a
Discharge­suction
bypass

Notes Usage Specifications Check method

1) High/low pressure bypass at
start-up and stopping, and
capacity control during low­load operation

AC220-240V
Open while being powered/
closed while not being pow­ered

2) High-pressure-rise preven­tion

SV5b
Heat
exchanger

Controls outdoor unit heat ex­changer capacity

AC220-240V
Closed while being powered/

open while not being powered
capacity con­trol

SV5c EP300 -

EP450
models
only

SV9 High-pressure-rise prevention Open while being powered/

closed while not being pow-

ered

SV2 High-Low pressure bypass during

defrost

Open while being powered/

closed while not being pow-

ered

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 follow­ing page(s). [8-8
Troubleshooting
LEV Prob­lems](page 228)

4-way
valve

Fan
motor

LEV2
(Refrigerant

Adjusts refrigerant flow during

heating
flow adjust­ment)

21S4a Changeover between heating and

cooling

21S4b 1) Changeover between heating

21S4c EP300-

EP450
models

and cooling

2) Controls outdoor unit heat ex­changer capacity

only

FAN motor
1,2

FAN mo­tor 2 is
only on
the
EP350 -

Regulates the heat exchanger ca­pacity by adjusting the operating
frequency and operating the pro­peller fan based on the operating

pressure.
EP450
models.

DC12V
Opening of a valve driven by a
stepping motor 2100 pulses
(Max. 3000 pulses)

AC220-240V
Dead: cooling cycle
Live: heating cycle

AC220-240V
Dead: cooling cycle
Outdoor unit heat exchanger
capacity at 100%
Live: heating cycle
Outdoor unit heat exchanger
capacity at 50%
or heating cycle

AC380-400V, 920W

Refer to the section
"Continuity Test
with a Tester".
Continuity between
white and orange.
Continuity between
yellow, brown, and
blue.

3 Major Components, Their Functions and Refrigerant Circuits

Continuity check
with a tester

HWE12050 GB

- 59 -

[3-4 Functions of the Major Components of Indoor Unit ]

3-4 Functions of the Major Components of 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 tem-

LEV control during cooling op­eration (superheat detection)

perature)

TH4
Outdoor air tem­perature)

*1

Temperature

Indoor unit control (Thermo)

Indoor unit control (Thermo)
sensor (Indoor
air temperature)

DC12V
Opening of stepping motor
driving valve 0-(1800) pulses

R0=15k
R

0/80

=3460
Rt =
15exp{3460( - )}

1

273+t

1

273

0°C [32°F]:15 k
10°C [50°F] :9.7 k
20°C [68°F]:6.4 k
25°C [77°F] :5.3 k
30°C [86°F] :4.3 k
40°C [104°F] :3.1 k

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

*1. Indicates gas pipe temperature on the PKFY-P VHM-E and PKFY-P VKM-E models.

HWE12050 GB

- 60 -

Chapter 4 Electrical Components and Wiring Diagrams

4-1 Outdoor Unit Circuit Board Arrangement......................................................................................... 63

4-1-1 Outdoor Unit Control Box ...................................................................................................................... 63

4-1-2 Fan Box................................................................................................................................................. 64

4-2 Outdoor Unit Circuit Board Components ......................................................................................... 65

4-2-1 Control Board ........................................................................................................................................ 65

4-2-2 M-NET Board (Transmission Power Supply Board) ............................................................................. 66

4-2-3 INV Board ............................................................................................................................................. 67

4-2-4 Fan Board ............................................................................................................................................. 68

4-2-5 Noise Filter ............................................................................................................................................ 69

4-2-6 Connect Board ...................................................................................................................................... 70

4-3 Outdoor Unit Electrical Wiring Diagrams ......................................................................................... 71

4-4 Transmission Booster Electrical Wiring Diagrams ......................................................................... 73

HWE12050 GB

- 61 -

HWE12050 GB

- 62 -

[4-1 Outdoor Unit Circuit Board Arrangement ]

<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.)

FAN board

Control boardElectromagnetic relay

(DCL)

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

M-NET boardINV board

Note 1)

Ground terminal

Terminal block
for power supply
(TB1)

Terminal block for
transmission line
(TB3, TB7)

Capacitor
(C100)

Electromagnetic
contactor (72C)

Noise filter

4 Electrical Components and Wir ing Diagrams

4-1 Outdoor Unit Circuit Board Arrangement

4-1-1 Outdoor Unit Control Box

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.

3) Control box houses high temperature parts. Be well careful even after turning off the power source.

4) Perform the service after disconnecting the outdoor unit fan board connector (CNINV) and the inverter board con-

nector (CN1). To plug or unplug connectors, check that the outdoor unit fan is not rotating and that the voltage of
capacitor in the main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when
the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.

5) To connect wiring to TB7, check that the voltage is 20 VDC or below.

6) Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN1) back to the inverter board after
servicing.

7) 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 capacitor voltage (inverter main circuit) has dropped to 20 V DC or less. It takes about 10 minutes to discharge electricity
after the power supply is turned off.

8) When the power is turned on, the compressor is energized even while it is not operating. Before turning on the power, discon­nect all power supply wires from the compressor terminal block, and measure the insulation resistance of the compressor.

compressor and turn on the power to the outdoor unit. The liquid refrigerant in the compressor will evaporate by energizing
the compressor.

HWE12050 GB

Check the compressor for a ground fault. If the insulation resistance is 1.0 M or below, connect all power supply wires to the

4 Electrical Components and Wiring Diagrams

- 63 -

[4-1 Outdoor Unit Circuit Board Arrangement ]

FAN board

Connect board

Note 1)

4-1-2 Fan Box

(1) PUHY-EP300, EP350, EP400, EP450YKM-A

1. Handle the fan box with care. If the front or the bottom panel becomes damaged, water or dust may enter the fan box, dam­aging its internal parts.

2. Perform the service after disconnecting the fan board connector (CNINV) and the connect board connector (CN103).

To plug or unplug connectors, check that the outdoor unit fan is not rotating and that the voltage of capacitor in the
main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when the outdoor
unit fan rotates in windy conditions.

3. Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN103) back to the connect board
after servicing.

HWE12050 GB

- 64 -

[4-2 Outdoor Unit Circuit Board Components ]

4-2 Outdoor Unit Circuit Board Components

4-2-1 Control Board

*For information about the display of SW4 function settings, refer to the following page(s). [5-1-1 Outdoor Unit Switch Func­tions and Factory Settings](page 77)

HWE12050 GB

- 65 -

4 Electrical Components and Wiring Diagrams

[4-2 Outdoor Unit Circuit Board Components ]

4-2-2 M-NET Board (Transmission Power Supply 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
12VDC input
GND
5VDC input
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

HWE12050 GB

- 66 -

[4-2 Outdoor Unit Circuit Board Components ]

4-2-3 INV Board

1) 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 capacitor voltage (inverter main circuit) has dropped to 20 VDC or less. It takes about 10 minutes to discharge electricity
after the power supply is turned off.

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.

3) Control box houses high temperature parts. Be well careful even after turning off the power source.

4) Perform the service after disconnecting the outdoor unit fan board connector (CNINV) and the inverter board con-

nector (CN1). To plug or unplugb connectors, check that the outdoor unit fan is not rotating and that the voltage of
capacitor in the main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when
the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.

5) To connect wiring to TB7, check that the voltage is 20 VDC or below.

6) Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN1) back to the inverter board after
servicing.

7) When the power is turned on, the compressor is energized even while it is not operating. Before turning on the power, discon­nect all power supply wires from the compressor terminal block, and measure the insulation resistance of the compressor.
Check the compressor for a ground fault. If the insulation resistance is 1.0 M or below, connect all power supply wires to the
compressor and turn on the power to the outdoor unit. The liquid refrigerant in the compressor will evaporate by energizing
the compressor.

HWE12050 GB

- 67 -

4 Electrical Components and Wiring Diagrams

[4-2 Outdoor Unit Circuit Board Components ]

4-2-4 Fan Board

1) 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 capacitor voltage (inverter main circuit) has dropped to 20 VDC or less. It takes about 10 minutes to discharge electricity
after the power supply is turned off.

2) Control box houses high temperature parts. Be well careful even after turning off the power source.

3) Perform the service after disconnecting the outdoor unit fan board connector (CNINV) and the inverter board con-

nector (CN1). To plug or unplugconnectors, check that the outdoor unit fan is not rotating and that the voltage of
capacitor in the main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when
the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.

4) To connect wiring to TB7, check that the voltage is 20 VDC or below.

5) Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN1) back to the inverter board after
servicing.

HWE12050 GB

- 68 -

[4-2 Outdoor Unit Circuit Board Components ]

CN4
Output
(Rectified L2-N current)
P
N

CN5
Output
(Rectified L2-N current)
P
N

TB21
Input/output(L1)

TB22
Input/output(L2)

TB23
Input/output(L3)

TB24
Input(N)

CN1B
Input
L3
L2

CN1A
Input
N
L1

Grounding

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

CN3
Output
L1
N

Grounding

CN2
Surge absorber circuit
Surge absorber circuit
Short circuit
Short circuit

4-2-5 Noise Filter

4 Electrical Components and Wiring Diagrams

HWE12050 GB

- 69 -

[4-2 Outdoor Unit Circuit Board Components ]

1

4-2-6 Connect Board

(1) PUHY-EP300, EP350, EP400, EP450YKM-A

1) 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 capacitor voltage (inverter main circuit) has dropped to 20 VDC or less. It takes about 10 minutes to discharge electricity
after the power supply is turned off.

2) Control box houses high temperature parts. Be well careful even after turning off the power source.

3) Perform the service after disconnecting the fan board connector (CNINV) and the connector board connector

(CN103). To plug or unplugconnectors, check that the outdoor unit fan is not rotating and that the voltage of capac­itor in the main circuit is 20 VDC or below. The capacitor may collect a charge and cause an electric shock when the
outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.

4) To connect wiring to TB7, check that the voltage is 20 VDC or below.

5) Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN103) back to the connector board
after servicing.

HWE12050 GB

- 70 -

[4-3 Outdoor Unit Electrical Wiring Diagrams ]

*3

*5

*6

*4

*3

+

+

+

RSH01,RSH1

For current detection

Central control transmission cable

Indoor/Outdoor transmission cable

C30~C37

Capacitor (inverter main circuit)

L

Choke coil (for high frequency noise reduction)

For inrush current prevention

Resistor

R1,5

HIC bypass,Controls refrigerant

flow in HIC circuit

Subcooled liquid refrigerant

temperature

For opening/closing the discharge

suction bypass

SV2

Pipe temperature

Outdoor unit heat exchanger

capacity control

SV5b

SV1a

LEV2

21S4a

Symbol

<Symbol explanation>

63H1

63HS1

63LS

72C

21S4b

CT12,22,3

LEV1

DCL

Pressure control,Refrigerant flow

rate control

Solenoid

valve

For opening/closing the bypass

circuit under the O/S

Heat exchanger capacity control

4-way valve

Explanation

Pressure

sensor

Cooling/Heating switching

Pressure

switch

High pressure protection for the

outdoor unit

Discharge pressure

Low pressure

Magnetic relay(inverter main circuit)

Current sensor(AC)

Linear

expansion

valve

DC reactor

Subcool bypass outlet

temperature

TH2

Z24,25

THHS

TH7

TH6

TH5

TH4

TH3

TB7

TB3

TB1

SV9

Thermistor

Discharge pipe temperature

ACC inlet pipe temperature

OA temperature

IPM temperature

Function setting connector

Power supply

Terminal

block

For opening/closing the bypass

circuit

C310,C311

F301

DC700V

4A T

RSH01

12

L3

N

red

CNPS

132

1

TP1 TP2

TB3

2

3

TB7

M1 M2 M1 M2 S

1

512 34

1

2

LEV2

M

1234612

132

345

6

3

615

31

2

2

CN82

blue

134

CN83

black

L1

L2

31

Fan motor

(Heat exchanger)

U

V

W

CNINV

714

34

CN4

black

1

13

231

3

SW001

1

4

CN2

1

12

1

3

31

432

2

3

1

1

CNSNR

TH2

TH4

4

1

1

1

CN211

green

23

123

321

U

5

2

54321

1

3

2

1

23

123

1

CN6

21

2

yellow

CNPOW

1

654

X10

ON

X08

X07

X09

Unit address

setting

CT12

CN5

red

D1

R4

-

Z5

1

35511

6

white

12

34

3

green

CN62

CN990

green

CN213

green

CNTYP4

green

F4

AC250V

6.3A T

R5

CN201

Z25

TH5

TH6

SWU2

LED1

SW6

10

Control Board

TH3

CN40

63HS1

CN41

TH7

15

234

1

SW4

LED3

5

LEV1

3

3

SET UP(SW6-10)

SC-V

CT22

SC-U

V

CN4

blue

red

M

OFF

black

CN506

red

CNTYP2

black

6

yellow

CN3K

Compressor ON/OFF output

Error detection output

TB21

DC12V

CN51

SV5b

CN1A

U

CN2

blue

CN3N

1

3

+

3

21S4b

4

TB1

CN1B

TB7 Power

selecting

connector

CNVDC

1

IPM

2

5

6

L3 N

DCL

black

72C

white

red

26

ON

OFF

M-NET power

supply circuit

12

M-NET Board

Power failure

detection circuit

Indoor/Outdoor

transmission

cable

INV Board

red

TB23 TB24

L2L1

ON

1's

digit

THHS

CN102

C31,C33,

C35,C37

1

4

1

1

W

10's

digit

OFF

LED2:Normal operation(Lit)

/ Error(Blink)

CNS2

yellow

CNDC

red

red

MS

3~

2

2

C100

U

LED1:Power supply to

Indoor/Outdoor

transmission line

ZNR400

black

Central control

transmission

cable

SC-L1

ONOFF

FT-N

R30,R32,

R34

Motor

(Compressor)

red

CN3S

1

CN04

red

CN43

yellow

1

SC-P2

P

CN61

green

CN202

red

C30,C32,

C34,C36

8

N

CN1

LED1:Normal operation(Lit)

/ Error(Blink)

SC-W

SC-L3

2

CN72

P

63H1

4

1

SW5

10

5

CN3D

1

CPU power

supply circuit

black

CNAC2

1

ONOFF

10

SWU1

white

CN212

red

SC-L2

6

2

CN80

CNTYP5

green

LED4:CPU in operation

LED1:Normal operation(Lit)

/ Error(Blink)

CN801

red

5

IPM

4

SC-P1

FT-P

black

red

DB1

CT3

C1

CNTYP

black

black

TB22

SWP01

RSH1

R6

C11

FAN Board

63LS

ZNR1

U

Noise

Filter

Z24

2

CN507

black
336

4

CN3

green

SV9

SV2

Function

setting

LED1

Display

setting/

Function

setting

72C

Noise filter

Noise filter

6

7

red

Surge

absorber

1

2

CNLVA

CNLVB

red

1

F01

AC250V

3.15A T

MS

3~

white

black

1

CNIT

red

L1 L2 L3

N

R31,R33,

R35

*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.

3

4

1

R1,R5

X05

X06

351

6

CN505

13

CNAC

CN81

green

12

5

123

4

4

4

CN2

SV1a

21S4a

Power Source

3N~

50/60Hz

380/400/415V

t°

t°t°t°

t°

t°

t°

L

4-3 Outdoor Unit Electrical Wiring Diagrams

(1) PUHY-EP200, EP250 models

4 Electrical Components and Wiring Diagrams

HWE12050 GB

- 71 -

[4-3 Outdoor Unit Electrical Wiring Diagrams ]

t°

t°t°t°

t°

t°

t°

*3

*3

*5

*6

*4

FT2-P

F101

DC700V

4A T

FT2-N

C102

R104~R106R101~R103

C101

HIC bypass,Controls refrigerant

flow in HIC circuit

Subcooled liquid refrigerant

temperature

For opening/closing the discharge

suction bypass

SV2

R1,5

Resistor

For inrush current prevention

Pipe temperature

Outdoor unit heat exchanger

capacity control

SV5b,c

RSH01,RSH1

For current detection

Indoor/Outdoor transmission cable

For opening/closing the bypass circuit

Central control transmission cable

C30~C37

Capacitor (inverter main circuit)

L

Choke coil (for high frequency noise reduction)

SV1a

Subcool bypass outlet temperature

LEV2

21S4a

Symbol

<Symbol explanation>

63H1

63HS1

63LS

72C

21S4b,c

CT12,22,3

LEV1

DCL

Pressure control,Refrigerant flow

rate control

Solenoid

valve

For opening/closing the bypass

circuit under the O/S

Heat exchanger capacity control

4-way valve

Explanation

Pressure

sensor

Cooling/Heating switching

Pressure

switch

High pressure protection for the

outdoor unit

Discharge pressure

Low pressure

Magnetic relay (inverter main circuit)

Current sensor(AC)

Linear

expansion

valve

DC reactor

TH2

Z24,25

THHS

TH7

TH6

TH5

TH4

TH3

TB7

TB3

TB1

SV9

Thermistor

Discharge pipe temperature

ACC inlet pipe temperature

OA temperature

IPM temperature

Function setting connector

Power supply

Terminal

block

F301

DC700V

4A T

C310,C311

RSH01

F301

DC700V

4A T

C310,C311

RSH01

CNINV

FAN Board

CN3

green

1

3

CONNECT Board

54321

1

123

CN2A

123

CN2

M2

CPU power

supply circuit

M1

CN332

blue

12

12

X05

X06

351

6

CN505

13

W

V

U

Fan motor

(Heat exchanger)

CN4

black

M1

LED1:Normal operation(Lit)

/ Error(Blink)

LED4:CPU in operation

3

IPM

CNVDC

1

CN81

green

CN80

SW001

42

L3 N

23

6543212

1

1

8

OFF ON

4

1

417

CNINV

14

red

CNPS

132

1

TP1 TP2

TB3

2

3

CN201

blue

CN4A

black

TB7

S

CNAC

512 34

CN81

green

543

1

1

2

LEV2

M

123461234

1

2

5

6

365

31

CN202

green

3

L1

L2

31

3

4

black

CN103

Fan motor

(Heat exchanger)

U

V

W

714

341

13

3

SW001

1

4

12

CN2

1

5

1

123

4

12

1

3

31

432

2

3

1

1

CNSNR

M2

TH2

TH4

4

4

1

1

1

CN211

green

23

123

321

SV1a

U

CN83

black

21S4a

Power Source

3N~

50/60Hz

380/400/415V

5

2

CN104

4

4

1

1

1

3

2

Noise filter

1

23

Surge

absorber

red

black

MS

3~

2

123

1

CN6

1

21

MS

3~

3

2

CN82

blue

yellow

CNPOW

1

654

X10

X12

ON

X08

X07

X09

X11

Unit address

setting

CT12

C31,C33,

C35,C37

CN5

red

D1

R4

-

Z5

1

35551

1

1

6

white

12

34

3

green

CN62

SET UP(SW6-10)

LED1

Display

setting/

Function

setting

CN51

DC12V

Function

setting

CN990

green

CN213

green

CNTYP4

green

F4

AC250V

6.3A T

R5

Compressor ON/OFF output

Error detection output

CN201

Z25

TH5

TH6

SWU2

LED1

R31,R33,

R35

R30,R32,

R34

SW6

10

Control Board

TH3

CN40

63HS1

CN41

TH7

15

234

1

SW4

LED3

5

LEV1

3

3

SC-V

CT22

SC-U

V

CN4

blue

red

M

OFF

black

CN506

red

CNTYP2

black

6

yellow

CN3K

TB21

SV5b

SV5c

CN1A

U

CN2

blue

CN3N

+

3

21S4b

21S4c

TB1

CN1B

TB7 Power

selecting

connector

CNVDC

1

IPM

2

6

L3 N

DCL

black

72C

white

red

26

ON

OFF

M-NET power

supply circuit

12

M-NET Board

Power failure

detection circuit

Indoor/Outdoor

transmission

cable

INV Board

red

TB23 TB24

L2L1

ON

1's

digit

THHS

CN102

1

4

1

1

W

10's

digit

OFF

LED2:Normal operation(Lit)

/ Error(Blink)

CNS2

yellow

CNDC

red

red

MS

3~

2

2

C100

U

LED1:Power supply to

Indoor/Outdoor

transmission line

ZNR400

6

black

Central control

transmission

cable

SC-L1

ONOFF

FT-N

Motor

(Compressor)

red

CN3S

1

CN04

red

CN43

yellow

1

SC-P2

P

CN61

green

CN202

red

8

N

CN1

1

2

LED1:Normal operation(Lit)

/ Error(Blink)

SC-W

SC-L3

2

CN72

P

63H1

4

1

SW5

10

5

CN3D

1

black

CNAC2

1

ONOFF

10

SWU1

white

CN212

red

SC-L2

3

6

2

CN80

4

CNTYP5

green

LED4:CPU in operation

LED1:Normal operation(Lit)

/ Error(Blink)

5

CN801

red

CNSNR

5

IPM

4

SC-P1

FT-P

black

C30,C32,

C34,C36

red

DB1

CT3

C1

CNTYP

black

R1,R5

black

TB22

SWP01

RSH1

R6

C11

FAN Board

63LS

ZNR1

U

L

Noise

Filter

Z24

2

CN507

black

CN508

blue

3

3

3

6

6

4

SV9

SV2

Noise filter

72C

6

7

red

1

2

CNLVA

CNLVB

red

1

F01

AC250V

3.15A T

white

black

1

CNIT

red

L1 L2 L3

N

*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.

4

1

++

++

+

(2) PUHY-EP300, EP350, EP400, EP450 models

HWE12050 GB

- 72 -

[4-4 Transmission Booster Electrical Wiring Diagrams ]

220 - 240VAC

Terminal block for power supply
(TB1)

L

Red

Red Red

White

Green

250V 5A

Grounding

Red
Red

Red

U

U

White

White White

White

White

White Blue Red Red

DSA

White

White

Blue

Red

Red

Red

Red

Varistor

Varistor

Noise filter

Stabilized power supply

4

3

2

1

1

2

3

CN2

CN1

Black

Black

Black

Black

Green/Yellow

1

2

3

E

4

Choke coil

1 2

CN3

1 2 1 2

CN4

CN2

1

2

CN1

Electronic control board

Black

White

Red

Red

Black

S

B

A

S

B

A

Terminal block 2 for
transmission line (TB3)
Expanded (indoor unit) side

Terminal block 1 for
transmission line (TB2)
Expanded (outdoor unit) side

4-4 Transmission Booster Electrical Wiring Diagrams

HWE12050 GB

- 73 -

4 Electrical Components and Wiring Diagrams

[4-4 Transmission Booster Electrical Wiring Diagrams ]

HWE12050 GB

- 74 -

Chapter 5 Control

5-1 Dipswitch Functions and Factory Settings ...................................................................................... 77

5-1-1 Outdoor Unit Switch Functions and Factory Settings ........................................................................... 77

5-1-2 Indoor Unit Switch Functions and Factory Settings .............................................................................. 80

5-1-3 Remote Controller Switch Functions and Factory Settings................................................................... 81

5-2 Outdoor Unit Control .......................................................................................................................... 83

5-2-1 Overview ............................................................................................................................................... 83

5-2-2 Rotation Control .................................................................................................................................... 83

5-2-3 Initial Control ......................................................................................................................................... 83

5-2-4 Startup Control ...................................................................................................................................... 83

5-2-5 Refrigerant Bypass Control ................................................................................................................... 84

5-2-6 Frequency Control ................................................................................................................................ 85

5-2-7 Defrost Operation Control ..................................................................................................................... 86

5-2-8 Refrigerant Recovery Control ............................................................................................................... 88

5-2-9 Outdoor Unit Fan Control...................................................................................................................... 89

5-2-10 Subcool Coil Control (Linear Expansion Valve 1) ................................................................................. 89

5-2-11 Refrigerant Flow Control (Linear Expansion Valve 2) ........................................................................... 89

5-2-12 Control at Initial Startup ........................................................................................................................ 89

5-2-13 Emergency Operation Mode ................................................................................................................. 92

5-2-14 Operation Mode .................................................................................................................................... 95

5-2-15 Demand Control .................................................................................................................................... 95

5-3 Operation Flowcharts ......................................................................................................................... 96

5-3-1 Operation Sequence Flowchart ............................................................................................................ 96

5-3-2 Actions Performed in Different Modes .................................................................................................. 98

HWE12050 GB

- 75 -

HWE12050 GB

- 76 -

[5-1 Dipswitch Functions and Factory Settings ]

5 Control

5-1 Dipswitch Functions and Factory Settings

5-1-1 Outdoor Unit Switch Functions and Factory Settings

(1) Control board

Switch Function

SWU 1-2

SW5

SW6

Unit address set­ting

Centralized control

1

switch

Deletion of connec-

2

tion information

3-

4- -

5- -

6- -

7- -

8- -

COP priority setting

2

(at low outside tem­perature)

Model setting (out-

4

door unit/high static
pressure setting)

Model setting (out-

5

door unit/high static
pressure setting)

Performance-prior-

7

ity/low-noise mode
setting

Function according to switch setting

OFF ON

Set to 00 or 51-100 with the dial switch Before power on

Without connec­tion to the central­ized controller

Normal control Deletion Before power on

Normal control

Normal static pres­sure

High (60 Pa) High (30 Pa) Before power on

Performance-pri­ority mode (Note 3)

With connection to
the centralized con­troller

Preset before shipment

COP priority mode
(at low outside tem­perature)

High static pres­sure

Quiet-priority mode

Switch setting timing

Before power on

Before power on

Before power on

Anytime after power
on

Units that require

switch setting

(Note 2)

C

B

A

-

A

C

C

5 Control

A

Low-noise mode/

8

step demand
switching

Self-diagnosis/

10

function setting No.
display setting

1) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.

2) A: Only the switch on OC needs to be set for the setting to be effective.
B: The switches on both the OC and OS need to be set to the same seeing for the setting to be effective.
C: The switches on both the OC and OS need to be set.

3) When set to the performance-priority mode, the low-noise mode will be terminated, and the units will operate in the normal
mode.
Cooling: Ambient temperature or the high pressure is high.
Heating: When the outside air temperature is low or when the low pressure is low. Refer to the following page(s). [2-4-7 Var­ious Control Methods Using the Signal Input/Output Connector on Outdoor Unit](page 23)

4) Operation noise is reduced by controlling the compressor frequencies and the rotation speed of the outdoor unit fans.
CN3D needs to be set. Refer to the following page(s). [2-4-7 Various Control Methods Using the Signal Input/Output Connec­tor on Outdoor Unit](page 23)

Low-noise mode
(Note 4)

Self-diagnosis
monitor display

Step demand mode Before power on

Function setting
No. display

Anytime after power
on

C

C

HWE12050 GB

- 77 -

[5-1 Dipswitch Functions and Factory Settings ]

SW4
SW6-10:
OFF

SW4
1-10
[0:OFF,
1:ON]
(Note 1)
SW6-10:ON

Function according to switch setting

Switch Function

1-10
1:ON, 0:OFF

No.769 1000000011 Test run mode: ON/OFF Stops all ICs

No.832 0000001011

No.896 0000000111

No.897 1000000111

No.912 0000100111 Pump down function Normal control

No.913 1000100111 Forced defrost (Note 3) Normal control Forced defrost starts

No.915 1100100111

No.916 0010100111

No.921 1001100111 Temperature unit display °C °F Anytime after power on C

No.922 0101100111

No.932 0010010111 Heating backup Disabled Enabled Anytime after power on A

No.964 0010001111

No.972 0011001111

No.982 0110101111

Self-diagnosis/operation
monitor

Cumulative compressor
operation time deletion

Clearance of error
history

High sensible heat opera­tion setting

Defrost start temperature
(Note 3)

Defrost end temperature
(Note 3)

Refrigerant amount adjust­ment

Target evaporation tem­perature setting

Automatic cooling/heating
mode (IC with the smallest
address)

Target evaporation tem­perature setting

OFF (LED3 Unlit) ON (LED3 Lit)

Refer to the following page(s). [9 LED Sta­tus Indicators on the Outdoor Unit Circuit
Board](page 253)

Sends a test-run sig­nal to all IC

Retained Cleared Anytime after power on (OFFON) C

OC Retained (IC/OC) Deleted (IC/OC)

OS Retained (OS) Deleted (OS)

Normal control

EP200: -10°C [14°F]
EP250 - EP450:

-8°C [18°F]

EP200, EP300,
EP350: 10°C [50°F]
EP400, EP450:
12°C [54°F]
EP250: 7°C [45°F]

Normal control

Depends on the setting combination with No.
982 (Note 4)

Normal control

Depends on the setting combination with No.
964 (Note 4)

High sensible heat
operation mode

Pump down opera­tion

-5°C [23°F] Anytime after power on B

5°C [41°F] Anytime after power on B

Refrigerant amount
adjust mode

Automatic cooling/
heating mode

Switch setting timing

Anytime after power on C

Anytime after power on A

Anytime after power on (OFFON) C

Before power on A

After being energized and while the com­pressor is stopped

10 minutes after the completion of de­frost operation (OFFON) or 10 minutes
after compressor start-up (OFFON)

Anytime after power on (except during
initial startup/becomes ineffective 60
minutes after compressor started up.

Anytime after power on A

Before power on A

Anytime after power on A

Units that

require

switch

setting

(Note 2)

A

D

A

1) To change the settings, set SW6-10 to ON, set SW4, and press and hold SWP01 for 2 seconds or longer (OFFON).
LED3 will light up when the switch setting is ON, and lights off when OFF.
Use the LED3 display to confirm that the settings are properly made.
The settings will need to be set again when the control board is replaced. Write down the settings on the electrical wiring drawing label.

2) A: OC: Only the switch on OC needs to be set for the setting to be effective.
B: OC: The switches on both the OC and OS need to be set to the same seeing for the setting to be effective.
C: OC: The switches on both the OC and OS need to be set.
D: OC: The switch on either the OC or OS needs to be set.

3) For details, refer to the following page(s).[5-2-7 Defrost Operation Control](page 86)

4) The table below shows the combinations of the settings for items No. 964 and No. 982 and the target evaporating temperature setting that corresponds
to each combination.

Switch

No.982

OFF ON

No.964 OFF 0°C [32°F] -4°C [25°F]

ON -2°C [28°F] -15°C [5°F]

5) Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.

6) The settings that are configured with SW4 (SW6-10: ON) will automatically be stored on the indoor units that support the new function*. The stored
settings will automatically be restored when the outdoor unit control board is replaced.

If none of the connected indoor units supports the new function, no configuration information will be saved. If this is the case, manually record the
settings configuration on the control box panel.

*The new function is supported on most units that are manufactured in December of 2012 and later. Depending on the model, this function may be

added on later date. Ask your dealer for further details.

HWE12050 GB

- 78 -

[5-1 Dipswitch Functions and Factory Settings ]

(2) INV board

Functions are switched with the following connector.

Connector Function

Function according to connec-

tor

Enabled Disabled

Setting timing

CN6 short­circuit con-

nector

Enabling/disabling the following error
detection functions;
ACCT sensor failure
(5301 Detail No. 115)
ACCT sensor circuit failure

Error detec­tion enabled

Error detec­tion disable
(No load op­eration is pos­sible.)

Anytime after power on

(5301 Detail No.117)
IPM open/ACCT erroneous wiring
(5301 Detail No. 119)
Detection of ACCT erroneous wiring
(5301 Detail No.120)

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.

(3) Fan board (Control box side, Fan box side)

Function according to switch

Switch Function

setting

Switch setting timing

OFF ON

SW1 1 Enabling/Disabling no-load opera-

tion

No-load oper­ation disabled

No-load oper­ation enabled

Anytime after power on

No-load operation will continue for
approximately 30 seconds, and
then the unit will come to an abnor­mal stop. For details, refer to the
following page(s). [8-9-8 Checking
the Fan Inverter for Damage at No
Load](page 238)

2 - - - -

3 - - - -

5 Control

4 - - - -

5 Address setting (Control box side) 0 5 Before power on

6 Address setting (Fan box side) 0 6 Before power on

Only the addresses are preset before shipment (All other switches are set to OFF.) Unless otherwise specified, leave the

switch to OFF where indicated by "-," which may be set to OFF for a reason.

Set SW1-5 on the control-box-side fan board to ON (address = 5). Set SW1-6 on the fan-box-side fan board to ON (address

= 6).

Leave SW1-1 to OFF during normal operation. Setting this switch to ON will disable the error detection function and may result

in equipment damage.

HWE12050 GB

- 79 -

[5-1 Dipswitch Functions and Factory Settings ]

SW3-1

OFF

OFF

OFF

ON

ON

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

Very Low

Low

Preset speed

Preset speed

Preset speed

Stop

Stop

Stop

Stop

Switch setting

SW1-7 SW1-8 Heating Cooling

Cooling-only/heat pump

Heat pump

Cooling-only

Heat pump

Fan speed during Thermo-OFF

Note 2. If both SW1-7 and SW1-8 are set to ON, the fan remains stopped during heating Thermo-OFF.
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 Function

Function according to switch setting

OFF ON

Switch setting timing

Notes

SW1

SW3

1

2

3

4

5

6

7

8

9

10

9

10

1

2

3

4

5

6

7

8

Room temperature
detection position

Clogged filter detection

Filter check reminder time setting

Outside air intake

Remote display option

Humidifier control

Self-recovery after power failure

Fan speed setting for
Heating Thermo-OFF

Power source start-stop

Unit model selection

Louver

Van e

Vane swing function

-

Vane angle limit setting
for cooling operation

Initial vane position

Heating 4°C [7.2°F] up

Automatic LEV value
conversion function

Indoor unit inlet

100h

Disabled

Fan output

2500h

Enabled

Thermo-ON signal

Built-in sensor on
the remote controller

Available

During heating operation

According to the
SW1-7 setting

Heat pump

Always on while in the heating mode

Fan speed setting for
Heating Thermo-OFF

Very Low Low

Preset speed

Cooling only

Enabled

Enabled

Disabled

Disabled Enabled

Enabled

Not available Available

Not available Available

Not available

Not available

Available

Not available

Available

Not available Available

--

---

Downblow B,C Horizontal

While the unit is stopped
(Remote controller OFF)

Always set to OFF on PKFY-VBM model units

Set to ON (built-in sensor on the remote controller)
on All Fresh (PEFY-VMH-F) model units

Applicable to All Fresh model units
(PEFY-VMH-F) only

Applicable to All Fresh model units
(PEFY-VMH-F) only

Always set to OFF on PKFY-VBM model units

PLFY-VLMD model only

Set to OFF on floor-standing
(PFFY) type units

Always set to Downblow B or C on
PKFY-VBM model units

Disabled

SHm setting 2°C [3.6°F]

10°C [18°F]

5°C [9°F]

15°C [27°F]

The setting depends on the
model and type.

The setting depends on the
model and type.

SCm setting

Disabled

Forced heating operation
at OA temp of 5 C or below

-

-

-

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.)

Model

Capacity (model) code

SW2

setting

123456

P20

4

ON
OFF

123456

P15

3

ON
OFF

P25

5

123456

ON
OFF

P32

6

123456

ON
OFF

P40

8

123456

ON
OFF

P50

10

123456

ON
OFF

123456

P63

13

ON
OFF

P71

14

123456

ON
OFF

P80

16

123456

ON
OFF

P100

20

123456

ON
OFF

P125

25

123456

ON
OFF

P200

40

123456

ON
OFF

P250

50

123456

ON
OFF

123456

P140

28

ON
OFF

5-1-2 Indoor Unit Switch Functions and Factory Settings

(1) Dipswitches

1) SW1,3

2) SW2

The setting timing for SW2 is before power is turned on.

For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 253)

HWE12050 GB

- 80 -

[5-1 Dipswitch Functions and Factory Settings ]

1 2 3 4

ON

OFF

Comment

Switch setting timing

Before power on

Before power on

Before power on

Before power on

OFFONSW contents Main

SW No.

1

Remote controller
Main/Sub setting

Main

Set one of the two remote controllers at one
group to “ON”.

2

Temperature display
units setting

Celsius

When the temperature is displayed in
[Fahrenheit], set to “OFF”.

3

Cooling/heating
display in AUTO mode

Yes

When you do not want to display “Cooling” and
“Heating” in the AUTO mode, set to “OFF”.

4

Indoor temperature
display

Yes

Sub

Fahrenheit

No

No

When you want to display the indoor
temperature, set to “ON”.

(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.

5-1-3 Remote Controller Switch Functions and Factory Settings

(1) MA simple remote controller (PAC-YT52CRA)

There are switches on the back of the top case. Remote controller Main/Sub and other function settings are performed using
these switches. Ordinarily, only change the Main/Sub setting of SW1. (The factory settings are ON for SW1, 2, and 3 and OFF
for SW4.)

The MA remote controllers (PAR-31MAA and PAR-21MAA) do not have the switches listed above. Refer to the installation
manual for the function setting.

HWE12050 GB

- 81 -

5 Control

[5-1 Dipswitch Functions and Factory Settings ]

0

1

2

3

4

5

6

7

8

9

0

1

2

3

4

5

6

7

8

9

0

1

2

3

4

5

6

7

8

9

0

1

2

3

4

5

6

7

8

9

10's digit 1's digit

(left) (right)

Remote controller unit

Rotary switch

Example: In case of address 108

(2) ME remote controller (PAR-F27MEA)

Set the address of the remote controller with the rotary switch.

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

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 [2.0 mm [0.08 in] (w)], and do not apply than 19.6N.
The use of any other tool or applying too much load may damage the switch.

HWE12050 GB

- 82 -

[5-2 Outdoor Unit Control ]

ON

123 54678910

ON

123 54678910

5-2 Outdoor Unit Control

5-2-1 Overview

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 (SW4).

SW4 (SW6-10:OFF) Display

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.
For how to read the SW settings, refer to the following page(s). [9-1-1 How

to Read the LED](page 253)

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.

5-2-2 Rotation Control

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.)

For information about rotation control at initial startup, refer to the following page(s). [5-2-12 Control at Initial Startup](page 89)
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 (SW4) on the OC.

SW4 (SW6-10:OFF) Display

OCOS1OS2: "oc" and the OC address appear alternately on the display.
OS1OS2OC: "oS-1" and the OS1 address appear alternately on the display.
OS2OCOS1: "oS-2" and the OS2 address appear alternately on the display.
For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read

the LED](page 253)

5-2-3 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

 Model and capacity  and communication address in turn every second.

5 Control

5-2-4 Startup Control

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).

HWE12050 GB

- 83 -

[5-2 Outdoor Unit Control ]

5-2-5 Refrigerant 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), (SV2) (ON = Open)

Operation

SV1a

ON OFF

When starting-up the compressor of each

ON for 4 minutes.

outdoor unit

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

During compressor operation at Fmin fre­quency in the cooling mode and when the

When low pressure (63LS) drops
below 0.23 MPa [33 psi].

When low pressure (63LS) ex-

ceeds 0.38 MPa [55 psi].
low pressure (63LS) drops (three or more
minutes after compressor startup)

The following conditions are met during the
heating mode: Compressor frequency after

When the low pressure (63LS)
drops below 0.12 MPa [17 psi]

When the low pressure (63LS) ris-

es above 0.16 MPa [23 psi]
power on is greater than 0.
The low pressure (63LS) drops (One or
more minutes after compressor startup if the
cumulative compressor operation time is
one hour or less; three or more minutes if
the cumulative compressor operation time is
one hour or more)

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 returning to normal operation after
completion of the defrost cycle

When 63HS1 exceeds 3.50MPa

[507psi]

If TH7>-15°C, stays ON for five minutes, then turns off

If TH7< = -15°C, stays ON for 25 minutes,

or stays ON until 63HS's reading is below 1.96 MPa [284 psi], then turns off

When 63HS1 is or below 2.70Mpa

[391psi]

Others Always OFF

SV2

Operation

ON OFF

During defrost During defrost only All other times except during defrost

HWE12050 GB

- 84 -

[5-2 Outdoor Unit Control ]

5-2-6 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 10 57 10

250 model 65 10 80 10

300 model 74 16 83 16

350 model 95 16 104 16

400 model 97 16 108 16

450 model 111 16 120 16

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).

5 Control

HWE12050 GB

- 85 -

[5-2 Outdoor Unit Control ]

5-2-7 Defrost Operation Control

(1) Starting the defrost operation

The defrost cycle will start when all of the three conditions (outside temperature, cumulative compressor operation time, and

pipe temperature) under <Condition 1>, <Condition 2>, or <Condition 3> are met.

Condition 1 Condition 2 Condition 3

Outside temperature
(TH7)

Cumulative compressor
operation time

Pipe temperature
(TH3)

1) Pipe temperature(TH3)

-5ºC [23ºF] or above -5ºC [23ºF] or below

50 minutes or more

90 minutes or more if the defrost prohibit timer is set to 90.

The pipe temperature has
stayed below the temperatures
in the table below (Note1) for
three minutes.

The pipe temperature has
stayed below the value ob­tained from the formula "Out­side temperature (TH7) - 5ºC [
23ºF] " for three minutes, or the
63LS reading has stayed below
the value obtained from the for­mula "1.5 + 0.02 x (20+TH7)"
for three minutes.

250 minutes or more

The pipe temperature has
stayed below the temperatures
in the table below (Note1) for
three minutes

EP200 EP250 EP300 - EP450

SW4 (915) OFF -10ºC -8ºC -8ºC

SW4 (915) ON -5ºC -5ºC -5ºC

The defrost cycle will not start if other outdoor units are in the defrost cycle or until a minimum of 10 minutes have passed

since the completion of the last defrost cycle.

If 10 minutes have passed since compressor startup or since the completion of a defrost cycle, a forced defrost cycle can be

started by setting DIP SW4(913) to ON.

Even if the defrost-prohibit timer is set to 90 minutes, the actual defrost-prohibit time for the next defrost cycle is 50 minutes

if the last defrost cycle took 12 minutes.

All units in the heating mode will simultaneously go into the defrost cycle in a system with multiple units. The units that are

not in operation may or may not go into the defrost cycle, depending on the cumulative operation time of their compressors.

(2) Defrost operation

Compressor frequency Model Compressor frequency

EP200 model 65 Hz

EP250 model 103 Hz

EP300 - EP350 models 107Hz

EP400 - EP450 models 118Hz

Outdoor unit fan Stopped

SV1a ON

SV5b, SV5c OFF(open)

21S4a OFF

21S4b, 21S4c OFF

SV9 OFF

SV2 ON

LEV1 0 pulses

*1

LEV2 3000 pulses

*1. This value may be greater than 0 pulse depending on the 63LS and TH4 status.

HWE12050 GB

- 86 -

[5-2 Outdoor Unit 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)

has been continuously detected for 4 minutes (when SW4 (916) is set to OFF) or 2 minutes (when SW4 (916) is set to ON)
that exceeds the values in the table below.

The defrost cycle will not end for two minutes once started unless one of the following conditions is met : Pipe temperature

reaches 25°C [77°F] and SW4 (916) is set to OFF OR

*1

=25+TH7°C [77°F+TH7] and SW4 (916) is set to ON.

*1 (5°C [41°F] 25°C [77°F]).

In the multiple-outdoor-unit system, defrosting is stopped on all units at the same time.

Model

TH3

SW4 (916) OFF SW4 (916) ON

EP200 model 10°C [50°F] 5°C [41°F]

EP250 model 7°C [45°F] 5°C [41°F]

EP300 - EP350 models 10°C [50°F] 5°C [41°F]

EP400 - EP450 models 12°C [54°F] 5°C [41°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.

5 Control

HWE12050 GB

- 87 -

[5-2 Outdoor Unit Control ]

Opening of LEV during refrigerant recovery
Opening of indoor unit LEV: 400 pulses

Initial opening of LEV

Start

Finish

30 seconds

5-2-8 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.

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.

(2) During cooling operation

Starting refrigerant recovery mode

The refrigerant recovery mode starts when all the following conditions are met:

30 minutes have passed since the completion of previous refrigerant recovery.
When the unit keeps running for 3 minutes in a row or more with high discharge temperature
TH4 > 105°C [221°F] or 63HS1 > 3.43 MPa [497 psi] (35 kg/cm

2

G) and SC0 > 10°C [18°F]

Refrigerant recovery

The opening of LEV1 is increased and periodic control begins again.

HWE12050 GB

- 88 -

[5-2 Outdoor Unit Control ]

50 F 60Hz

or F < 50Hz

Initial startup mode starts.

Completed in the integrated operation time of 35 minutes.

Initial startup mode complete

or the discharge superheat (TH4 - Tc) is detected (within
5 minutes of startup) that remains above approximately
25 degrees for one minute .

Completed in the integrated operation time of 90 minutes.

5-2-9 Outdoor Unit Fan Control

(1) Control method

Depending on the capacity required, the rotation speed of the outdoor unit fan is controlled by the inverter, targeting a constant

evaporation temperature of (0°C [32°F]= 0.71 MPa [103 psi]) during cooling operation and constant condensing temperature
of (49°C [120°F]= 2.88 MPa [418 psi]) during heating operation.

The OS in the multiple-outdoor-unit system operates at the actual outdoor unit fan control value that is calculated by the OS

based on the preliminary outdoor unit fan control value that the OC determines.

(2) Control

Outdoor unit fan stops while the compressor is stopped (except in the presence of input from snow sensor).
The fan operates at full speed for 5 seconds after start-up.(Only when TH7<0°C [32°F])
The outdoor unit fan stops during defrost operation.
On the EP300-EP450 models of outdoor units, before the second fan goes into operation, the capacity of the first fan that

went into operation will be reduced to 50% of its maximum capacity.

5-2-10 Subcool Coil Control (Linear Expansion Valve 1)

The OC, OS1, and OS2 controls the subcool coil individually.
The LEV is controlled every 30 seconds to maintain constant the subcool at the outdoor unit heat exchanger outlet that is

calculated from the values of high pressure (63HS1) and liquid piping temperature (TH3), or the superheat that is calculated
from the values of low pressure (63LS) and the bypass outlet temperature (TH2) of the subcool coil.

LEV opening is controlled based on the values of the inlet (TH6) and the outlet (TH3) temperatures of the subcool coil, high

pressure (63HS1), and discharge temperature (TH4). In a single-outdoor-unit system, the LEV is closed (0) in the heating
mode, while the compressor is stopped, and during cooling Thermo-OFF. In a multiple-outdoor-unit system, the LEV closes
(0) during heating operation, while the compressor is stopped, or during cooling Thermo-OFF. The LEV opens to a specified
position when 15 minutes have passed after Thermo-OFF. (65 pulses)

During the defrost cycle, normally, the valve initially operates at 0 pulses, although it may operate at higher pulses depending

on the 63LS and TH4 status.

5-2-11 Refrigerant Flow Control (Linear Expansion Valve 2)

Refrigerant flow is controlled by each unit in the combined models during heating. Refrigerant flow control is performed by the

OC, OS1, and OS2 individually. The valve opens to a specified angle during cooling (Opening: 2100 pulses)

Valve opening is controlled based on the values of high pressure (63HS1), discharge temperature (TH4), low pressure(

63LS), and piping temperature (TH5).

The valve moves to the predetermined position while the unit is stopped.
The valve opening may increase to 3000 pulses during the defrost cycle or when the units are operated in unusual operating

conditions.

5-2-12 Control at Initial Startup

When started up for the first time before 12 hours have elapsed after power on, the unit goes into the initial startup mode.
At the completion of the initial operation mode on the OC, OS1, and OS2, they will go into the normal control mode.

(1) EP200 - EP450YKM models

5 Control

HWE12050 GB

- 89 -

[5-2 Outdoor Unit Control ]

(2) EP400 - EP600YSKM models

Initial startup mode starts.

The compressor on the OC starts up.
F 60Hz

The total operating load of the indoor unit
after 5 minutes of operation is P250 or above.

The compressor on the OC remains in operation, and the
compressor on the OS starts up.

50 F 60Hz (both OC and OS)

Completed in the integrated operation time of 35 minutes.

or F < 50Hz (both OC and OS)
Completed in the integrated operation time of 90 minutes.

or the discharge superheat (TH4 - Tc) is detected (within

5 minutes of startup) that remains above approximately

25 degrees for one minute .

*1

Qj 50)

(

Yes

No

*2

*3

The compressor on the OC starts up.

50 F 60Hz (OC)

Completed in the integrated operation time of 35 minutes.

or F < 50Hz (OC)

Completed in the integrated operation time of 90 minutes.

or the discharge superheat (TH4 - Tc) is detected (within
5 minutes of startup) that remains above approximately
25 degrees for one minute .

Both the OC and OS stop.

The startup sequence of the OC and OS is rotated.

The compressor on the OS starts up.

50 F 60Hz (OS)

Completed in the integrated operation time of 35 minutes.

or F < 50Hz (OS)

Completed in the integrated operation time of 90 minutes.

or the discharge superheat (TH4 - Tc) is detected (within
5 minutes of startup) that remains above approximately
25 degrees for one minute .

*2

Initial startup mode complete

The air conditioning load is too small for both the OC and the OS to
simultaneously stay in operation.
*3
The air conditioning load is high enough for both OC and OS to
simultaneously stay in operation.

∗1 Qj:Total capacity (models) code

For information about capacity codes, refer to the following page(s).[5-1-2 Indoor Unit Switch Functions and Factory Set­tings](page 80)

HWE12050 GB

- 90 -

[5-2 Outdoor Unit Control ]

Initial startup mode starts.

The compressor on the OC starts up.
F 60Hz

The total operating load of the indoor unit
after 5 minutes of operation is P250 or above.

(

*1

Qj 50)

The total operating load of the indoor unit after
5 minutes of operation is between P250 and P1000.

(50 < *1 Qj< 200)

50 F 60Hz (OC, OS1, and OS2)

or F < 50Hz (OC, OS1, and OS2)

Completed in the integrated operation time of 35 minutes.

Completed in the integrated operation time of 90 minutes.

The compressor on the OS remains in operation, and the
compressors on the OS1 and OS2 start up.

50 F 60Hz (both OC and OS1)

or F < 50Hz (both OC and OS1)

Completed in the integrated operation time of 35 minutes.

Completed in the integrated operation time of 90 minutes.

The compressor on the OC remains in operation,
and the compressor on the OS1 starts up.

50 F 60Hz (OC)

or F < 50Hz (OC)

Completed in the integrated operation time of 35 minutes.

Completed in the integrated operation time of 90 minutes.

The compressor on the OC starts up.

The OC, OS1, and OS2 stop.
The startup sequence of the OC,
OS1, and OS2 is rotated.
(The startup sequence of the OC,
OS1 and OS2 is changed.)

The OC, OS1, and OS2 stop.

The startup sequence of the OC, OS1,
and OS2 is rotated.
(The startup sequence of the OC,
OS1 and OS2 is changed.)

The OC, OS1, and OS2 stop.
The startup sequence of the OC,
OS1, and OS2 is rotated.
(The startup sequence of the OC,
OS1 and OS2 is changed.)

50 F 60Hz (OS1)

or F < 50Hz (OS1)

Completed in the integrated operation time of 35 minutes.

Completed in the integrated operation time of 90 minutes.

The compressor on the OS1 starts up.

50 F 60Hz (OS2)

or F < 50Hz (OS2)

Completed in the integrated operation time of 35 minutes.

Completed in the integrated operation time of 90 minutes.

The compressor on the OS2 starts up.

*2

*3

*4

*5

Yes

No

No

Yes

Initial startup mode complete

50 F 60Hz (both OS1 and OS2)

Completed in the integrated operation time of 35 minutes.

Completed in the integrated operation time of 90 minutes.

The compressor on the OS1 remains in operation,
and the compressor on the OS2 starts up.

or F < 50Hz (both OS1 and OS2)

*2
The air conditioning load is
too small for the OC, OS1,
and OS2 to simultaneously
stay in operation.

*3
The air conditioning load is
too small for both OC and
OS1, or OS1 and OS2 to
simultaneously stay in
operation.

*4
The air conditioning load is
high enough for OC, OS1
and OS2 to simultaneously
stay in operation.

*5
The air conditioning load is
high enough for both OC
and OS1, or OS1 and OS2
to simultaneously stay in
operation.

or the discharge superheat (TH4 - Tc) is detected (within
5 minutes of startup) that remains above approximately
25 degrees for one minute .

or the discharge superheat (TH4 - Tc) is detected
(within 5 minutes of startup) that remains above
approximately 25 degrees for one minute .

or the discharge superheat (TH4 - Tc) is detected
(within 5 minutes of startup) that remains above
approximately 25 degrees for one minute .

or the discharge superheat (TH4 - Tc) is
detected (within 5 minutes of startup) that
remains above approximately 25 degrees for
one minute .

or the discharge superheat (TH4 - Tc) is
detected (within 5 minutes of startup) that
remains above approximately 25 degrees for
one minute .

or the discharge superheat (TH4 - Tc) is
detected (within 5 minutes of startup) that
remains above approximately 25 degrees for
one minute .

(3) EP650 - EP900YSKM models

∗1 Qj:Total capacity (models) code

For information about capacity codes, refer to the following page(s).[5-1-2 Indoor Unit Switch Functions and Factory Set­tings](page 80)

5 Control

HWE12050 GB

- 91 -