Mitsubishi PUHY-P250YJM-A, PFD-500VM-E, PUHY-P500YSJM-A, PFD-P250VM-E Service Manual

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HWE1018A GB

Safety Precautions

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

WARNING

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

the risk of serious injury or death.

CAUTION

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

the risk of serious injury or damage to the unit.

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

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

WARNING

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.

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

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

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

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

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

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

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

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

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

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

Do not touch the heat exchanger fins.

The fins are sharp and dangerous.

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

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

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

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

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

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

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WARNING

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

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

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

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

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

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

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

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

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

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

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

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

Only use accessories recommended by MITSUBISHI.

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

Control box houses high-voltage parts.

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

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Precautions for handling units for use with R410A

CAUTION

Do not use the existing refrigerant piping.

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

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

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

existing pipes to burst.

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

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

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

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

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

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

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

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

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

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

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

If the refrigerant or the refrigerating machine oil left on

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

Infiltration of water may cause the refrigerating machine

oil to deteriorate.

Gas leak detectors for conventional refrigerants will not

detect an R410A leak because R410A is free of chlorine.

Do not use a charging cylinder.

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

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

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

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Before installing the unit

WARNING

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

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

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

The unit is not designed to preserve food products.

Do not use the unit in an unusual environment.

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

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

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

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

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

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

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

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

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

CAUTION

Properly ground the unit.

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

Do not put tension on the power supply wires.

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

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

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

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

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

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

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

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

Otherwise, electric shock and/or fire may result.

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

Periodically check the installation base for damage.

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

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

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

Exercise caution when transporting products.

Products weighing more than 20 kg should not be carried

alone.

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

some products.

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

dangerous.

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

to prevent the unit from falling.

Properly dispose of the packing materials.

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

injury.

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

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

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Before the test run

CAUTION

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

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

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

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

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

Do not operate the unit without panels and safety
guards.

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

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

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

Do not operate the unit without the air filter.

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

CONTENTS

HWE1018A GB

I Read Before Servicing

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

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

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

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

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

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

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

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

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

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

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

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

II Restrictions

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

[2] Types and Maximum allowable Length of Cables .................................................................. 18

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

[4] An Example of a System to which an MA Remote Controller is connected ........................... 24

[5] Restrictions on Pipe Length.................................................................................................... 32

III Outdoor Unit Components

[1] Outdoor Unit Components and Refrigerant Circuit ................................................................. 37

[2] Control Box of the Outdoor Unit.............................................................................................. 39

[3] Outdoor Unit Circuit Board...................................................................................................... 40

IV Indoor Unit Components

[1] External Dimensions............................................................................................................... 47

[2] Indoor Unit Components and Internal Structure ..................................................................... 49

[3] Control Box of the Indoor Unit ................................................................................................ 53

[4] Indoor Unit Circuit Board ........................................................................................................ 54

[5] Separating the top and bottom of the unit............................................................................... 55

V Electrical Wiring Diagram

[1] Electrical Wiring Diagram of the Outdoor Unit ........................................................................ 61

[2] Electrical Wiring Diagram of the Indoor Unit ........................................................................... 62

VI Refrigerant Circuit

[1] Refrigerant Circuit Diagram .................................................................................................... 67

[2] Principal Parts and Functions ................................................................................................. 70

VII Control

[1] Functions and Factory Settings of the Dipswitches ................................................................ 77

[2] Controlling the Outdoor Unit ................................................................................................... 82

[3] Controlling the Indoor Unit ...................................................................................................... 94

[4] Operation Flow Chart.............................................................................................................. 98

VIII Test Run Mode

[1] Items to be checked before a Test Run ................................................................................ 105

[2] Test Run Method .................................................................................................................. 106

[3] Operating Characteristic and Refrigerant Amount................................................................ 107

[4] Adjusting the Refrigerant Amount......................................................................................... 107

[5] Refrigerant Amount Adjust Mode.......................................................................................... 109

[6] The following symptoms are normal. .................................................................................... 111

[7] Standard Operation Data (Reference Data) ......................................................................... 112

[8] Initialization Procedure for System Rotation Settings .......................................................... 113

IX Troubleshooting

[1] Error Code Lists.................................................................................................................... 123

[2] Responding to Error Display on the Remote Controller........................................................ 126

[3] Investigation of Transmission Wave Shape/Noise ............................................................... 178

[4] Troubleshooting Principal Parts............................................................................................ 181

[5] Refrigerant Leak ................................................................................................................... 200

[6] Compressor Replacement Instructions................................................................................. 201

[7] Troubleshooting Using the Outdoor Unit LED Error Display................................................. 203

[8] Replacement instructions for motor and bearing .................................................................. 204

[9] Maintenance/Inspection Schedule ........................................................................................ 210

X LED Monitor Display on the Outdoor Unit Board

[1] How to Read the LED on the Service Monitor ...................................................................... 215

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I Read Before Servicing

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

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

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

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

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

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

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

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

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

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

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

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

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[ I Read Before Servicing ]

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I Read Before Servicing

[1] Read Before Servicing

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

New refrigerant series split-type air-conditioners for computer rooms R410A

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

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

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

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

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

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

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

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

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

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

CAUTION

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

[ I Read Before Servicing ]

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[2] Necessary Tools and Materials

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

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

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

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

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

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

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

Tools/Materials Use Notes

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

high-pressure side

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

conventional model.

Refrigerant Recovery Cylinder Refrigerant recovery

Refrigerant Cylinder Refrigerant charging The refrigerant type is indicated. The

cylinder is pink.

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

than that of the current port.

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

Tools/Materials Use Notes

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

may be used.

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

is attached.

Flare Tool Flare processing Flare processing dimensions for the

piping in the system using the new re­frigerant differ from those of R22. Re­fer to I [3] Piping Materials.

Refrigerant Recovery Equipment Refrigerant recovery May be used if compatible with

R410A.

Tools/Materials Use Notes

Vacuum Pump with a Check Valve Vacuum drying

Bender Bending pipes

Torque Wrench Tightening flare nuts Only the flare processing dimensions

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

Pipe Cutter Cutting pipes

Welder and Nitrogen Cylinder Welding pipes

Refrigerant Charging Meter Refrigerant charging

Vacuum Gauge Vacuum level check

Tools/Materials Use Notes

Charging Cylinder Refrigerant charging Prohibited to use

[ I Read Before Servicing ]

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[3] Piping Materials

1. Copper pipe materials

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

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.)

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) 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.

Maximum working pressure Refrigerant type

3.45 MPa [500psi] R22, R407C etc.

4.30 MPa [624psi] R410A etc.

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

ø6.35 [1/4"] 0.8t

O-material (Annealed)

ø9.52 [3/8"] 0.8t

ø12.7 [1/2"] 0.8t

ø15.88 [5/8"] 1.0t

ø19.05 [3/4"] 1.0t

1/2H-material,

H-material (Drawn)

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

Do not use the existing piping!

[ I Read Before Servicing ]

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HWE1018A GB

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.

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.

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.

Flare processing dimensions (mm[in])

Pipe size (mm[in])

A dimension (mm)

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

Flare nut dimensions (mm[in])

Pipe size (mm[in])

B dimension (mm)

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

Dimension A

Dimension B

[ I Read Before Servicing ]

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[4] Storage of Piping

1. Storage location

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

2. Sealing the pipe ends

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

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

[5] Pipe Processing

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

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

[ I Read Before Servicing ]

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[6] Brazing

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

Example: Inside the brazed connection

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.

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

[ I Read Before Servicing ]

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[7] Air Tightness Test

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

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.

Halide torch R22 leakage detector

[ I Read Before Servicing ]

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[8] Vacuum Drying (Evacuation)

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.)

(Photo1) 15010H (Photo2) 14010

Recommended vacuum gauge:
ROBINAIR 14010 Thermistor Vacuum Gauge

[ I Read Before Servicing ]

- 11 -

HWE1018A GB

[9] Refrigerant Charging

1. Reasons

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

2. Notes

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

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

If the refrigerant leaks out, it may be replenished. The entire refrigerant does not need to be replaced. (Charge refrigerant in the
liquid state.)
Refer to "IX [5] Refrigerant Leak."(page 200)

Cylinder with a siphon

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

Cylin­der

liquid

Valve Valve

liquid

Cylin­der

Cylinder without a siphon

[ I Read Before Servicing ]

- 12 -

HWE1018A GB

[11] Characteristics of the Conventional and the New Refrigerants

1. Chemical property

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

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

2

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.

New Refrigerant (HFC type) Conventional Refriger-

ant (HCFC type)

R410A R407C R22

R32/R125 R32/R125/R134a R22

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

Type of Refrigerant Pseudo-azeotropic

Refrigerant

Non-azeotropic

Refrigerant

Single Refrigerant

Chloride Not included Not included Included

Safety Class A1/A1 A1/A1 A1

Molecular Weight 72.6 86.2 86.5

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

Steam Pressure
(25°C,MPa/77°F,psi) (gauge)

1.557/226 0.9177/133 0.94/136

Saturated Steam Density
(25°C,kg/m

3

/77°F,psi)

64.0 42.5 44.4

Flammability Nonflammable Nonflammable Nonflammable

Ozone Depletion Coefficient (ODP)

*1

0 0 0.055

Global Warming Coefficient (GWP)

*2

1730 1530 1700

Refrigerant Charging Method Refrigerant charging in

the liquid state

Refrigerant charging in

the liquid state

Refrigerant charging in

the gaseous state

Replenishment of Refrigerant after a Refrigerant
Leak

Available Available Available

Temperature (°C/°F)

Pressure (gauge)

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

[ I Read Before Servicing ]

- 13 -

HWE1018A GB

[12] Notes on Refrigerating Machine Oil

1. Refrigerating machine oil in the HFC refrigerant system

HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system.
Note that the ester oil used in the system has properties that are different from commercially available ester oil.

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.

Refrigerant Refrigerating machine oil

R22 Mineral oil

R407C Ester oil

R410A Ester oil

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

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

Infiltration of
contaminants

Dust, dirt

Adhesion to expansion valve and capillary
tubes

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

Infiltration of contaminants into the com­pressor

Burn-in on the orbiting scroll

Mineral oil
etc.

Sludge formation and adhesion Clogged expansion valve and capillary tubes

Poor cooling performance
Compressor overheat

Oil degradation Burn-in on the orbiting scroll

[ I Read Before Servicing ]

- 14 -

HWE1018A GB

- 15 -

HWE1018A GB

II Restrictions

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

[2] Types and Maximum allowable Length of Cables ........................................................... 18

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

[4] An Example of a System to which an MA Remote Controller is connected..................... 24

[5] Restrictions on Pipe Length ............................................................................................. 32

- 16 -

HWE1018A GB

[ II Restrictions ]

- 17 -

HWE1018A GB

II Restrictions

[1] System configuration

*1 When two outdoor units are connected to one indoor unit, two refrigerant circuits must be connected.

Only one refrigerant circuit can be connected to the indoor unit at factory shipment. To connect two refrigerant circuits, per­form some work on the unit.

1. Restrictions when the PFD-type indoor units are connected (related to the system)

(1) The PFD-type indoor units cannot be connected to the ME remote controller.
(2) The address settings must be made on this system.
(3) The following functions cannot be selected on the PFD-type indoor units.

1) Switching between automatic power recovery Enabled/Disabled (Fixed to "Enabled" in the PFD-type indoor units)

2) Switching between power source start/stop (Fixed to "Disabled" in the PFD-type indoor units)

(4) The PFD-type indoor units and other types of indoor units cannot be grouped.
(5) The following functions are limited when the system controller (such as G-50A) is connected.

1) To perform group operation in the system with two refrigerant circuits (combination of two outdoor units and one indoor unit:
P500 model only), the addresses of the controller boards No.1 and No.2 on a indoor unit must be set within a group.

2) The local operation cannot be prohibited with the main remote controller.

3) When the switches of the PFD-type indoor units are set as follows, the unit ON/OFF operation cannot be made with the main
remote controller.

When the Normal/Local switching switch is set to "Local"
When the DipSW1-10 on the controller circuit board is set to "ON"

Indoor unit model Outdoor unit model

PFD-P250VM-E PUHY-P250YJM-A

PFD-P500VM-E PUHY-P250YJM-A x 2 *1

[ II Restrictions ]

- 18 -

HWE1018A GB

[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.

(2) Control wiring

Different types of control wiring are used for different systems.
Refer to section "[4] An Example of a System to which an MA Remote Controller is connected" before performing wiring work.

Types and maximum allowable length of cables

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

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

1) M-NET transmission line

Cable type

Facility
type

All facility types

Type Shielded cable CVVS, CPEVS, MVVS

Number of
cores

2-core cable

Cable size Larger than 1.25mm

2

[AWG16]

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

200m [656ft] max.

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

500m [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.

TB3:Terminal block for transmission line connection
TB7:Terminal block for transmission line for centralized control

multiple-core cable

2-core shielded cable

2-core shielded cable

Indoor unit

Indoor unit

Indoor unit

Indoor unit

Outdoor unit

Outdoor unit

Outdoor unit

TB3

TB7

TB3

TB7

TB3

TB7

TB3

TB7

[ II Restrictions ]

- 19 -

HWE1018A GB

2) Remote controller wiring

*1 The use of cables that are smaller than 0.75mm

2

[AWG18] is recommended for easy handling.

MA remote controller

Cable type

Type CVV

Number of
cores

2-core cable

Cable size

0.3 to 1.25mm

2 *1

[AWG22 to 16]

Maximum overall line
length

200m [656ft] max.

[ II Restrictions ]

- 20 -

HWE1018A GB

[3] Switch Settings and Address Settings

1. Switch setting

Refer to section "[4] An Example of a System to which an MA Remote Controller is connected" before performing wiring work.
Set the switches while the power is turned off.
If the switch settings are changed while the unit is being powered, those changes will not take effect, and the unit will not
function properly.

2. Address settings

(1) Address settings table

The need for address settings and the range of address setting depend on the configuration of the system. Refer to section
"II [4] An Example of a System to which an MA Remote Controller is connected"

*1. If a given address overlaps any of the addresses that are assigned to indoor or outdoor units in other refrigerant systems,

use a different, unused address within the setting range.

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

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

Unit or controller Symbols Address setting

range

Setting method Ad-

dress

setting

Indoor
unit

Main/sub
unit

IC 01 to 50

*1

In case of 10HP system, assign an odd number starting with
"01". In case of 20HP system with two refrigerant circuits, as­sign a sequential odd number starting with "01" to the upper
indoor controller, and assign "the address of the upper indoor
controller + 1" to the lower indoor controller.

00

MA remote
controller

MA No address settings required. (The main/sub switch must be configured if two

remote controllers are connected to the system or if the indoor units are con­nected to different outdoor units.)

Main

Outdoor unit OC 51 to 100

*1

Assign an address of the indoor units in the same refriger­ant system and 50.

00

System configura­tion

Connection to the
system controller

Power supply unit for
transmission lines

Group operation of
units in a system with
multiple outdoor units

Power supply switch con­nector connection

System with one
outdoor unit

_ _ _ Leave CN41 as it is

(Factory setting)

System with multi­ple outdoor units

Not connected _ Not grouped

Grouped Disconnect the male con-

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

With connection to
the indoor-outdoor
transmission line

Not required Grouped/not grouped

With connection to
the centralized con­trol system

Not required
(Powered from the
outdoor unit)

Grouped/not grouped

Required Grouped/not grouped Leave CN41 as it is

(Factory setting)

[ II Restrictions ]

- 21 -

HWE1018A GB

(3) Settings of MA remote controller Main/Sub switching switch (When MA remote controller is used: factory setting

"Main")

Main/sub settings are available on the MA remote controller. When two remote controllers are connected, set either of them
to "Sub".

(4) Selecting the position of temperature detection for the indoor unit (Factory setting: SWC "Standard")

To use a suction temperature sensor, set SWC to "Option". (The suction temperature sensor is supplied as standard specifi­cation.)

(5) Connection of two refrigerant circuits

When two refrigerant circuits are connected on site, make the switch settings on the controller circuit board following the in­structions described in the installation manual for the indoor unit.

(6) Cooling-only setting for the indoor unit: Cooling only model (Factory setting: SW3-1 on the indoor unit to "OFF.")

When using indoor unit as a cooling-only unit, set SW3-1 on the indoor unit to ON.

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

*4. By setting Dip SW5-5, the Low-noise mode can be switched between the Capacity priority mode and the Low-noise pri-

ority mode.
When SW5-5 is set to ON: The Low-noise mode always remains effective.
When SW5-5 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).

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

quired.

*6. Take out signals from the outdoor unit (OC) if multiple outdoor units exist in a single system.

Type Usage Function

Terminal

to be

used

*1

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

Option

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

input to the outdoor unit.

*It can be used as the DEMAND control device for each refriger-

ant system.

DEMAND (level) CN3D

*2

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

Adapter for
external input
(PAC­SC36NA-E)

Performs a low level noise operation of the outdoor unit by an ex­ternal input to the outdoor unit.
* It can be used as the silent operation device for each refrigerant
system.

Low-noise mode
(level)

*3*4

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

on-DEMAND are possible, using different configurations of 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.

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

*5

Snow sensor signal
input (level)

CN3S

Out-

put

How to extract signals from the outdoor unit

*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

*5

CN51 Adapter for

external out­put
(PAC­SC37SA-E)

Error status

*6

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

2

TH7 > 35°C [95°F]
or
63HS1 > 35kg/cm

2

TH7 < 0°C [32°F]
or
63LS < 3.9kg/cm

2

[ II Restrictions ]

- 22 -

HWE1018A GB

CAUTION

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

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

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

Example of wiring connection

3. Demand control

(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 and
OS).
Between 2 and 8 steps of demand control is possible by setting DIP SW4-4 on the outdoor units (OC and OS).

*1. Available demand functions

P250YJM model (single-outdoor-unit system): 2 and 4 steps shown in the rows (a) and (b) in the table above only.
P500YSJM model (two-outdoor-unit system OC+OS): 2-8 steps shown in the rows (a), (b), (c), and (d) in the table above.

*2. External signal is input to CN3D on the outdoor unit whose SW4-4 is set to ON. When SW4-4 is set to OFF on all outdoor

units, the signal is input to the CN3D on the OC.
Outdoor units whose SW4-4 is set to ON are selectable in a single refrigerant system.

Table.1

No Demand control switch

DipSW4-4

Input to CN3D *2

OC OS

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

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

(c) OFF ON OS

(d) 8 steps(0-25-38-50-63-75-88-100%) ON ON OC and OS

CN51

CN3S

CN51

X

Y

L

1

L

2

ecruos rewop pmaL

Distant control
board

Relay circuit Adapter

1

Outdoor unit
control board

Preparations

in the field

Maximum cable
length is 10m

5
4
3

X

Y

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.

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

X : Relay

Snow sensor : The outdoor fan runs when X is closed

in stop mode or thermostat mode.

X

CN3S

Preparations

in the field

Maximum cable
length is 10m

Adapter

2

Outdoor unit
control board

2

3

1

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

Relay circuit

CN3D

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

X : Low-noise mode

X : Low-noise mode

Y : Compressor ON/OFF
X,Y : Relay

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

Y

X

CN3D

Preparations

in the field

Maximum cable
length is 10m

Adapter

2

Outdoor unit
control board

3

2

1

Relay circuit

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

X

CN3D

Preparations

in the field

Maximum cable
length is 10m

Adapter

2

Outdoor unit
control board

2

3

1

X : Relay

fan frequency and maximum compressor frequency.

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

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

Relay circuit

[ II Restrictions ]

- 23 -

HWE1018A GB

*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 SW4-4 is set to
OFF.
When SW4-4 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.

(2) Contact input and control content

1) 2-step demand control

The same control as the Thermo-OFF is performed by closing 1-3 pin of CN3D.

2) 4-step demand control (When SW4-4 is set to ON on an outdoor unit)
Demand capacity is shown below.

3) 8-step demand control (When SW4-4 is set to ON on two outdoor units)
Demand capacity is shown below.

*1. The outdoor units whose SW4-4 is set to ON are designated as No. 1and No. 2 in the order of address from small to large.

Ex) When outdoor units whose SW4-4 is set to ON are designated as OC and OS, OC=No. 1 and OS=No. 2.

CN3D

1-3P

Open x = 100%

Close x = 0%

CN3D 1-2P

1-3P Open Close

Open x = 100% x = 75%

Close x = 0% x = 50%

8-step 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%

- 24 -

[ II Restrictions ]

GBHWE1018A

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

1. System with one refrigerant

(1) Sample control wiring

(2) Notes

1) Leave the male connector on the female power supply
switch connector (CN41) on the outdoor unit as it is.

2) It is not necessary to provide grounding to S terminal on
the terminal block for transmission line for centralized
control (TB7).

3) Although two indoor controllers (controller circuit boards)
are equipped inside the P500 models of indoor units, the
board on No.2 side (lower side) is not used. Do not con­nect wiring to the lower controller circuit board.

(3) Maximum allowable length

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

2

[AWG16] or larger)

L1+L2 200m [656ft]

*Two indoor controllers (controller circuit boards)
are equipped in the indoor unit (P500).

OC

TB3

TB7

M1M2

M1M2

S

51

IC

TB5-1

A1B1S

01

TB5-2

A2 B2

S

02

AB

TB15

1

2

MA

L2L1

Leave the male
connector on
CN41 as it is.

Leave the male
connector on
CN41 as it is.

OS

TB3

TB7

M1M2

M1M2

S

52

[ II Restrictions ]

25- 25 -

HWE1018A GB

(4) Wiring method

1) Indoor/outdoor transmission line
Connect M1, M2 terminals of the indoor/outdoor trans-

mission line terminal block (TB3) on the outdoor unit (OC
and OS) and A1, B1 terminals of the indoor/outdoor ter­minal block (TB5-1) on the indoor unit (IC). (Non-polar­ized 2-core cable)

Only use shielded cables.

Shielded cable connection

Connect the earth terminal of the OC and S terminal of
the IC terminal block (TB5-1).

2) Switch setting
Address setting is required as follows.

(5) Address setting method

The outdoor units in the same refrigerant circuit are automatically designated as OC and OS.
Units are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the
same).

Procedures Unit or controller

Address

setting range

Setting method Notes

Factory

setting

1 Indoor

unit

Main unit IC 01 to 50 Assign a sequential odd number

starting with "01" to the upper in­door controller.

00

Sub unit IC 01 to 50 Assign sequential numbers start-

ing with the address of the main
unit in the same group. (Main
unit address +1)

2 Outdoor unit OC OS51 to 100 Assign sequential numbers to

the outdoor units starting with the
number that equals the address
of the indoor unit in the same re­frigerant circuit plus 50.

00

3MA

remote
controller

Main
remote
controller

MA No settings

required.

-Main

Sub
remote
controller

MA Sub

remote
controller

Settings to be made with the sub/
main switch

- 26 -

[ II Restrictions ]

GBHWE1018A

2. System with two refrigerant circuits
(1) Sample control wiring

(2) Notes

1) Assign the sequential number to the indoor units.

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

3) Replacement of male power supply switch connec­tor(CN41) must be performed only on one of the outdoor
units.

4) Provide grounding to S terminal on the terminal block for­transmission line for centralized control (TB7) on only
one ofthe outdoor units.

5) When the power supply unit is connected to the trans­mission line for centralized control, leave the male con­nector on the female power supply switch connector
(CN41) as it is. (Factory setting)

(3) Maximum allowable length

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

2

[AWG16] or larger)

L1, L2 200m [656ft]

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

(1.25mm2 [AWG16] or larger)
L1+L31+L2 500m [1640ft]

OC

TB3

TB7

M1M2

M1M2

S

51

IC

TB5-1

A1 B1

S

01

TB5-2
A2 B2

S

02

OC

TB3

TB7

S

52

AB

TB15

1

2

MA

L31

L1

L2

CN41

CN40

Replace

Connect

M1M2

M1M2

*Two indoor controllers (controller circuit boards)
are equipped in the indoor unit (P500).

Leave the male
connector on
CN41 as it is.

Not connect

[ II Restrictions ]

27- 27 -

HWE1018A GB

(4) Wiring method

1) Indoor/outdoor transmission line
Connect M1, M2 terminals of the indoor/outdoor trans-

mission line terminal block (TB3) on the outdoor unit (OC
) and A1, B1 terminals of the indoor/outdoor terminal
block (TB5-1) on the indoor unit (IC). (Non-polarized 2­core cable)

Only use shielded cables.

Shielded cable connection

Connect the earth terminal of the OC and S terminal of
the IC terminal block (TB5-1).

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

for transmission line for centralized control (TB7) on
each outdoor unit (OC). Disconnect the male connector

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

Only use shielded cables.

Shielded cable connection

To ground the shielded cable, daisy-chain the S-termi­nals on the terminal block (TB7) on each of the outdoor
units. Connect the S (shielded) terminal on the terminal
block (TB7) on the outdoor unit whose male connector
on CN41 was disconnected and connected to CN40 to
the earth terminal( ) on the electric box.

3) Switch setting
Address setting is required as follows.

(5) Address setting method

Procedures Unit or controller

Address

setting range

Setting method Notes

Factory

setting

1 Indoor

unit

Main unit IC 01 to 50 Assign a sequential odd number

starting with "01" to the upper in­door controller.

00

Sub unit IC 01 to 50 Assign sequential numbers start-

ing with the address of the main
unit in the same group. (Main
unit address +1)

2 Outdoor unit OC 51 to 100 Add 50 to the address assigned

to the indoor unit connected to
the system with one outdoor unit.

00

3MA

remote
controller

Main
remote
controller

MA No settings

required.

-Main

Sub
remote
controller

MA Sub

remote
controller

Settings to be made with the sub/
main switch

- 28 -

[ II Restrictions ]

GBHWE1018A

3. System in which two MA remote controllers are connected to one indoor unit
(1) Sample control wiring

(2) Notes

1) Leave the male connector on the female power supply
switch connector (CN41) on the outdoor unit as it is.

2) It is not necessary to provide grounding to S terminal on
the terminal block for transmission line for centralized
control (TB7).

3) Although two indoor controllers (controller circuit boards)
are equipped inside the P500 models of indoor units, the
board on No.2 side (lower side) is not used. Do not con­nect wiring to the lower controller circuit board.

4) No more than two MA remote controllers (including both
main and sub controllers) can be connected to a group of
indoor units. If three or more MA remote controllers are
connected, remove the wire for the MA remote controller
from the terminal block (TB15).

(3) Maximum allowable length

1) Indoor/outdoor transmission line
Same as [4] 1.

2) MA remote controller wiring
Maximum overall line length (0.3 to 1.25mm

2

[AWG 22 to
16])
m1+m2 200m [656ft]

*Two indoor controllers (controller circuit boards)
are equipped in the indoor unit (P500).

Leave the male
connector on
CN41 as it is.

OC

TB3

TB7

M1M2

M1M2

S

51

IC

TB5-1
A1B1

S

01

TB5-2

A2 B2

S

02

AB

TB15

1

2

MA(Main)

AB

MA(Sub)

L2L1

Leave the male
connector on
CN41 as it is.

OS

TB3

TB7

M1M2

M1M2

S

52

A1 B2

MA

m1

m2

[ II Restrictions ]

29- 29 -

HWE1018A GB

(4) Wiring method

1) Indoor/outdoor transmission line
Same as [4] 1.

2) MA remote controller wiring

When 2 remote controllers are connected to the sys­tem

When two 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
MA remote controllers (option).

Set the Main/Sub switch on the connected MA remote

controllers (option) to SUB.(See the installation manual
for the MA remote controller for the setting method.)

3) Switch setting
Address setting is required as follows.

(5) Address setting method

The outdoor units in the same refrigerant circuit are automatically designated as OC and OS.
Units are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the
same).

Procedures Unit or controller

Address

setting range

Setting method Notes

Factory

setting

1 Indoor

unit

Main unit IC 01 to 50 Assign a sequential odd number

starting with "01" to the upper in­door controller.

00

Sub unit IC 01 to 50 Assign sequential numbers start-

ing with the address of the main
unit in the same group. (Main
unit address +1)

2 Outdoor unit OC OS51 to 100 Assign sequential numbers to

the outdoor units starting with the
number that equals the address
of the indoor unit in the same re­frigerant circuit plus 50.

00

3MA

remote
controller

Main
remote
controller

MA No settings re-

quired.

-Main

Sub
remote
controller

MA Sub

remote
controller

Settings to be made with the sub/
main switch

- 30 -

[ II Restrictions ]

GBHWE1018A

4. System in which two indoor units are grouped with the MA remote controller
(1) Sample control wiring

(2) Notes

1) Leave the male connector on the female power supply
switch connector (CN41) on the outdoor unit as it is.

2) It is not necessary to provide grounding to S terminal on
the terminal block for transmission line for centralized
control (TB7).

3) Although two indoor controllers (controller circuit boards)
are equipped inside the P500 models of indoor units, the
board on No.2 side (lower side) is not used. Do not con­nect wiring to the lower controller circuit board.

4) No more than two MA remote controllers (including both
main and sub controllers) can be connected to a group of
indoor units. If three or more MA remote controllers are
connected, remove the wire for the MA remote controller
from the terminal block (TB15).

(3) Maximum allowable length

1) Indoor/outdoor transmission line
Same as [4] 1.

2) MA remote controller wiring
Maximum overall line length ( 0.3 to 1.25mm

2

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

OC

TB3

TB7

M1M2

M1M2

M1M2

M1M2

S

51

IC

TB5-1
A1 B1

S

01

TB5-2
A2 B2

S

02

AB

TB15

1

2

MA(Main) MA(Sub)

L2

OC

TB3

TB7

S

53

IC

TB5-1

A1

B1

S

03

TB5-2
A2 B2

S

04

AB

TB15

1

2

L2 L1 L1

m1 m2

m3

*Two indoor controllers
(controller circuit boards)
are equipped in the indoor
unit (P500).

Leave the male
connector on
CN41 as it is.

Leave the male
connector on
CN41 as it is.

OS

TB3

TB7

M1M2

M1M2

M1M2

M1M2

S

52

OS

TB3

TB7

S

54

Leave the male
connector on
CN41 as it is.

Leave the male
connector on
CN41 as it is.

[ II Restrictions ]

31- 31 -

HWE1018A GB

(4) Wiring method

1) Indoor/outdoor transmission line
Same as [4] 1.

2) MA remote controller wiring

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). (Non-polarized 2-core cable)

Set the Main/Sub switch on one of the MA remote con-

trollers to SUB.

3) Switch setting
Address setting is required as follows.

(5) Address setting method

The outdoor units in the same refrigerant circuit are automatically designated as OC and OS.
Units are designated as OC and OS in the descending order of capacity (ascending order of address if the capacities are the
same).

Procedures Unit or controller

Address

setting range

Setting method Notes

Factory

setting

1 Indoor

unit

Main unit IC 01 to 50 Assign a sequential odd number

starting with "01" to the upper in­door controller.

00

Sub unit IC 01 to 50 Assign sequential numbers start-

ing with the address of the main
unit in the same group. (Main
unit address +1)

2 Outdoor unit OC OS51 to 100 Assign sequential numbers to

the outdoor units starting with the
number that equals the address
of the indoor unit in the same re­frigerant circuit plus 50.

00

3MA

remote
controller

Main
remote
controller

MA No settings

required.

-Main

Sub
remote
controller

MA Sub

remote
controller

Settings to be made with the sub
/ main switch

[ II Restrictions ]

- 32 -

HWE1018A GB

[5] Restrictions on Pipe Length

1. Sample connection
(1) System with one refrigerant circuit (P500 model)

(2) System with two refrigerant circuits (P250, P500 models)

Unit: m [ft]

Operation Pipe sections Allowable length of pipes

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

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

A(B)+C

165 [541] or less

(Equivalent length 190 [623] or less)

Height
difference

Between indoor and outdoor units H 50m [164ft] or less (40m [131ft] or

less when the outdoor unit is lower,
15m [49ft] when the outdoor temper­ature is 10°C [50°F] or lower)

Between outdoor units h1 0.1 [0.3] or less

Allowable length Total pipe length (L) from the outdoor

unit to thefarthest indoor unit

Actual length 165m [541ft] or less

Allowable height
difference

Height difference between the indoor
and the outdoor units (H)

50m [164ft] or less (40m [131ft] or less when the outdoor
unit is lower, 15m [49ft] when the outdoor temperature is
10°C [50°F] or lower)

Outdoor unit

Indoor

L

H

h1

B

C

A

L

L

H

A

Outdoor unit

Indoor

[ II Restrictions ]

- 33 -

HWE1018A GB

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

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

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

Outdoor unit set name
(total capacity)

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

250 model ø9.52 [3/8"] *1 ø22.2 [7/8"]

model Pipe diameter (mm) [inch]

250 model Liquid pipe ø9.52 [3/8"]

Gas pipe ø22.2 [7/8"]

500 model Liquid pipe ø15.88 [5/8"]

Gas pipe ø28.58 [1-1/8"]

[ II Restrictions ]

- 34 -

HWE1018A GB

- 35 -

HWE1018A GB

III Outdoor Unit Components

[1] Outdoor Unit Components and Refrigerant Circuit .......................................................... 37

[2] Control Box of the Outdoor Unit....................................................................................... 39

[3] Outdoor Unit Circuit Board............................................................................................... 40

- 36 -

HWE1018A GB

[ III Outdoor Unit Components ]

- 37 -

HWE1018A GB

III Outdoor Unit Components

[1] Outdoor Unit Components and Refrigerant Circuit

1. PUHY-P250YJM-A
(1) Front view of a outdoor unit

Fan

Control

Control

BoxBox

Control
Box

Fan guard

Fin guard

Front panel

Heat exchanger

Heat exchangerHeat exchanger

[ III Outdoor Unit Components ]

- 38 -

HWE1018A GB

2. PUHY-P250YJM-A
(1) Refrigerant circuit

High-pressure sensor(63HS1)

High-pressure switch(63H1)

Accumulator

Compressor cover

Compressor

Oil separator

Solenoid valve (SV1a)

Solenoid valve (SV9)Gas-side valve

Liquid-side valve

Linear expansion valve

(LEV2)

2-way valve(SV5b)

Linear expansion valve

(LEV1)

Subcool coil

High-pressure check joint

Low-pressure check joint

4-way valve(21S4a)

4-way valve(21S4b)

Check valve

Low-pressure sensor(63LS)

[ III Outdoor Unit Components ]

- 39 -

HWE1018A GB

[2] Control Box of the Outdoor Unit

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.

<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.)

Control board

DC reactor (DCL)

Electromagnetic relay(72C)

Noise filter

Note.1

INV board

Fan board

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

Terminal block for transmission
line (TB3, TB7)

M-NET board

Terminal block for power supply
L1,L2,L3,N,
(TB1)

Capacitor(C100)

[ III Outdoor Unit Components ]

- 40 -

HWE1018A GB

[3] Outdoor Unit Circuit Board

1. Outdoor unit control board

CN332
Output 18VDC
GND
(

Fan board

)

LED2
Lit during normal
CPU operation

CN72
72C
driving output

Serial communication signal input
GND (

INV board)

Output 17VDC

CN801
Pressure switch
connection

CN4
GND
Serial communication signal output

LEV
driving output

LED1
Service LED

SWU1,2
Address switch

SW1-5
Dip

switch

Sensor
input

CNVCC2
Output 12VDC
Output 5VDC
GND

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

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

CN41
Power supply for
centralized control OFF

CN40
Power supply for
centralized control ON

CN102

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

Power supply input for centralized control system (30VDC)

External signal input (contact input)

F01
Fuse
250V AC/3.15A

CNAC
L1
N

LED3
Lit
when powered

LED3
Lit
when powered

Actuator
driving output

Output 12VDC
Compressor
ON/OFF output
Error output

CN51

CNAC2
L1
N

CNDC
Bus voltage input
P
N

CN2

[ III Outdoor Unit Components ]

- 41 -

HWE1018A GB

2. M-NET board

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

CN102

CNS2
Transmission line input/output for
centralized control system

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

LED1
Power supply for
indoor
transmission line

TP1,2
Check pins for
indoor/outdoor
transmission line

TB7
Terminal block for
transmission line for
centralized control

TB3
Indoor/outdoor
transmission block

Ground terminal for
transmission line

Grounding

Grounding

CN04
Bus voltage input
P
N

Grounding

[ III Outdoor Unit Components ]

- 42 -

HWE1018A GB

3. INV board

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

SC-L1
Input(L1)

SC-L2
Input(L2)

SC-L3
Input(L3)

IGBT
(Rear)

Bus voltage check
terminal (P)
Note

Bus voltage check
terminal (N)
Note 1

SC-P2
Bus voltage Input(P)

SC-P1
Rectifier diode output (P)

LED1
Lit: Inverter in normal operation
Blink: Inverter error

CN6
Open: No-load operation setting
Short-circuited: Normal setting

CN5V
GND
5VDC output

RSH1
Overcurrent detection
resistor

CN4
GND

(Fan Board)
Serial communication
signal output

CN2

S

erial communication
signal output
GND
17VDC input

SC-V
Inverter output(V)

CNTYP Inverter
board type

SC-W
Inverter output(W)

SC-U
Inverter output(U)

CT22
Current sensor(W)

CT12
Current sensor(U)

C30 C37
Smoothing capacitor

CN1
Bus voltage output
N
P

CT3
Current sensor(L3)

[ III Outdoor Unit Components ]

- 43 -

HWE1018A GB

4. Fan board

CNVDC
Bus voltage input
N
P

CNINV
Inverter output
W
V
U

CN18V
Input 18VDC
GND

LED3
Lit during normal
CPU operation

CN4
GND
Serial communication signal output

CN5

GND(Control board)

Serial communication signal output

CN21
Serial communication signal output
GND(INV board)
Input 17VDC

CN22
GND(INV board)
Input 5VDC
Serial communication signal input
GND(INV board)
Output 17VDC

THBOX
Thermistor
(Control box internal temperature
detection)

LED1
Inverter in normal operation

LED2
Inverter error

DIP IPM Rear

R630,R631
Overcurrent detection
resistor

[ III Outdoor Unit Components ]

- 44 -

HWE1018A GB

5. Noise Filter

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

- 45 -

HWE1018A GB

IV Indoor Unit Components

[1] External Dimensions ........................................................................................................ 47

[2] Indoor Unit Components and Internal Structure .............................................................. 49

[3] Control Box of the Indoor Unit.......................................................................................... 53

[4] Indoor Unit Circuit Board.................................................................................................. 54

[5] Separating the top and bottom of the unit........................................................................ 55

- 46 -

HWE1018A GB

[ IV Indoor Unit Components ]

- 47 -

HWE1018A GB

IV Indoor Unit Components

[1] External Dimensions

1. PFD-P250VM-E model

Unit : mm

390

50

50

100

Note 1. Be sure to set up a trap for Emergency

drain piping.

(Trap height:beyond 100mm)

(Trap is not necessary for main drain piping.)

2. Approve this figure because it is refused

for the improvement and specification

subject to change without notice.

3. Amputate a gas pipe/liquid pipe in the

fixed height at the time of 2 refrigerant

circuit connection, and connect it with

the local pipe.

Drain piping connection

for humidifier

Air inlet

500 or more200 or more

400 or more

800 or more

Indoor unit

Service space

Unit surface

figure

Pipe execution

space

Unit front

figure

Indoor unit

Service space

Hole for the control wiring

Lifting bolts

<2-

ø

32 knock out

hole>

Hole for the power

supply(Body)

<Nomal/Local>

1380

Remote controller

A

Refrig. piping <gas>

ø

22.2 braze

Power supply:White

Operating :Green

Check :Yellow

Failure :Red

(Accessory)

Filter

Lamp

<view from A>

320

220

1950

20

100

462

580

Panel

<

ø

32 knock out hole>

Air inlet

Control box

50

140

Hole for the control wiring <

ø

32 knock out hole>

Main drain piping connection <Rp1-1/4>

<Accessory>

.

Lifting bolts ......4pc.

.

Front panel opening and closing key ......1pc.

100

Air outlet

Refrig. piping <liquid>

ø

9.52 braze

Hole for the power supply <

ø

32 knock out hole>

260

68

100

118 0

780

1340

Hole for the control wiring(

ø

60)

410

68

Hole for the power supply(

ø

60)

321

220

Hole for gas pipe connecting(

ø

42)

Air outlet

20

Bolt holes:8-

ø

18

140

305

100

518

Hole for liquid pipe connecting(

ø

24)

65

<Rp1-1/4>

Hole for liquid pipe connecting(

ø

24)

87

186

20

Emergency drain piping connection <Rp1-1/4>

Hole for gas pipe connecting(

ø

42)

Changeover switch(SW9)

340

100

150

260

171

20

401

740

[ IV Indoor Unit Components ]

- 48 -

HWE1018A GB

2. PFD-P500VM-E model

Unit : mm

50100

140

50

50390

100

68

124

135

Note 1. Be sure to set up a trap for Emergency

drain piping.

(Trap height:beyond 100mm)

(Trap is not necessary for main drain piping.)

2. Approve this figure because it is refused

for the improvement and specification

subject to change without notice.

3. Amputate a gas pipe/liquid pipe in the

fixed height at the time of 2 refrigerant

circuit connection, and connect it with

the local pipe.

Refrig. piping <liquid> in 2 refrig. circuit system ø 9.52 braze No.1

Refrig. piping <gas> in 2 refrig. circuit system

type P450:ø 19.05 braze, type P560:ø 22.2 braze No.1

Refrig. piping <liquid> ø 15.88 braze

Refrig. piping <gas> ø 28.58 braze

Hole for No.2 gas pipe

connecting(ø 42) in 2

refrig. circuit system

Hole for No.2 liquid pipe

connecting(ø 24) in 2

refrig. circuit system

Hole for liquid pipe connecting(ø 34)

Hole for No.1 liquid pipe connecting

(ø 24) in 2 refrig. circuit system

Bolt holes:8-ø 18

Hole for No.1 gas pipe connecting(ø 42)

in 2 refrig. circuit system

Hole for gas pipe connecting(ø 48)

Main drain piping connecting<Rp1-1/4>

Drain piping connection

for humidifier

<Accessory>

· Lifting bolts ······4pc.

· Front panel opening and closing key ······1pc.

Air inlet

Service space

Indoor unit

Pipe execution

space

Panel opening

and closing

dimension

Indoor unit

Unit surface

figure

Service space

400 or more

Unit front

figure

1000 or more *1

200 or more

*1. It is necessary for the removal

of the panel beyond 600mm.

500 or more

710

Refrig. piping <gas> in 2 refrig. circuit system

type P450:ø 19.05 braze,

type P560:ø 22.2 braze No.2

680

<2-ø 32 knock out

hole>

<ø 32 knock out hole>

Air outlet

Air inlet

Power supply :White

Operating :Green

Check :Yellow

Failure1 :Red

Failure2 :Red

<Normal/Local>

(Accessory)

<view from A>

<Rp1-1/4>

Air

outlet

Hole for liquid side pipe connecting

or No.1 gas side pipe connecting(ø 42)

in 2 refrig. circuit system

Hole for No.2 gas side pipe connecting(ø 42)

in 2 refrig. circuit system

100 1001780

1940

100

2020

20

65

321

100

410

359 241

740

359

580

305

320

220

370

20

Emergency drain piping connection <Rp1-1/4>

Hole for No.1 liquid side pipe connecting

(ø 24) in 2 refrig. circuit system

Hole for the power supply(ø 60)

1950

780

Hole for gas side pipe connecting or

No.2 liquid side pipe connecting(ø 48)

in 2 refrig. circuit system

440

Air

outlet

185

379

135

Refrig. piping <liquid> in 2 refrig. circuit

system ø 9.52 braze No.2

68

120

Hole for the control wiring <ø 32 knock out hole>

Hole for the power supply <ø 32 knock out hole>

220

150

81

Hole for the control wiring(ø 60)

Panel

68

Lifting bolts

171

A

Control box

Lamp

Filter

Remote controller

838

Hole for the control wiring

1980

124

68

Hole for the power

supply(Body)

Changeover switch (SW9)

[ IV Indoor Unit Components ]

- 49 -

HWE1018A GB

[2] Indoor Unit Components and Internal Structure

1. PFD-P250VM-E model
(1) Front view of a indoor unit

(2) Rear view of a indoor unit

Lock key X 2

Display lamp

Panel for refrigerant circuit maintenance

Panel for air filter maintenance

Operation panel (remote controller)

Panel for controller/fan related parts maintenance

[ IV Indoor Unit Components ]

- 50 -

HWE1018A GB

(3) Front view of internal structure

(4) Rear view of internal structure

Heat exchanger X 2 (front / back)

Sub drain pan

Suction temperature thermistor
(on the right side of heat exchanger)

Linear expansion valve (LEV)

Drain pan

Drain hose

Pulley X 2

Pipes (gas/liquid)

Fan motor

V belt

Controller

Air filter

Fan casing

(on the back of controller)

Discharge temperature thermistor
(on the left side of fan casing)

Drain hose

Pipes (ga /liquid)

Fan casing

[ IV Indoor Unit Components ]

- 51 -

HWE1018A GB

2. PFD-P500VM-E model
(1) Front view of a indoor unit

(2) Rear view of a indoor unit

Lock key X 4

Panel for controller maintenance

Display lamp

Operation panel (remote controller)

Panel for fan related parts maintenance

Panel for refrigerant circuit maintenance

Panel for air filter maintenance

[ IV Indoor Unit Components ]

- 52 -

HWE1018A GB

(3) Front view of internal structure

(4) Rear view of internal structure

Remote controller

Float switch X 2

Drain pan

Display lamp

Normal/Local switching switch(SW9)

Heat exchanger X 2 (front:No. 1; back:No. 2)

Sub drain pan

Suction temperature thermistor
(on the right side of heat exchanger)

Linear expansion valve (LEV)

Drain pan

Operation panel

Bearing

Drain hose

Pulley X 2

Pipes (gas/liquid)

Fan motor

V belt

<Location of drain pan overflow detection float switch>

Controller

Air filter

Fan casing

Discharge temperature thermistor
(on the left side of fan casing)

Bearing

Pipes (gas/liquid)

[ IV Indoor Unit Components ]

- 53 -

HWE1018A GB

[3] Control Box of the Indoor Unit

1. PFD-P250VM-E model

2. PFD-P500VM-E model

Circuit board for external I/O

Terminal block for transmission line (upper)
Terminal block for MA remote controller (lower)

Power supply terminal bed

Surge absorber board

Motor wiring

Surge breaker (51F)

Fuse (F1)

Electro magnetic
contactor (52F)

Relay(X11,Z1,Z3)

Controller board

Transformer

Circuit board for external I/O

Terminal block for transmission line on No.2 side (upper)
Terminal block for MA remote controller (lower)

Power supply terminal bed

Terminal block for transmission
line on No.1 side

Motor wiring

Surge breaker (51F)

Electro magnetic
contactor (52F)

Relay(X11,X12,Z1,Z2,Z3)

Controller board

Transformer

Adapter board for LEV

Surge absorber board

Fuse (F1)

[ IV Indoor Unit Components ]

- 54 -

HWE1018A GB

[4] Indoor Unit Circuit Board

1. PFD-P250,P500VM-E models
(1) Indoor Control Board

(2) External Input/Output Circuit Board

CND
Power supply
input
(AC 220~240V)

F901
Fuse

CN2M
Indoor unit
transmission
line

CN3T
Power supply input
(from transformer)

CNT
Power supply output
(to transformer)

CN90
Fan output

CNP
Drain pump
output

CN60
LEV output

SW1,2,3,4
Dip switch

CN24
Control signal
output

CN51
Switch input

LED1

LED2

CN31
Float switch input

CN32
Switch input

SW5

SWC
Switching between
discharge/suction control

Thermistor input

CN20
CN21
CN29
CN22

CN33
Lamp output

CN3A
Remote controller connection

CN53
Indoor control board (No.1)
To C N51

CN54
Indoor control board (No.2)
To C N51

TB22 (Relay contact output)

No.1 operation status
No.1 error status
No.2 operation status
No.2 error status

TB23 (Input with voltage)
ON/OFF

TB21 (Input no voltage)
ON/OFF

[ IV Indoor Unit Components ]

- 55 -

HWE1018A GB

[5] Separating the top and bottom of the unit

< Model 250 >

Filters (2)

Filter cover

Side panel: 14 screws

Front panel: 6 screws

Front panel:
2 chains

Rear panel: 9 screws

Side panel: 14 screws

Rear panel: 8 screws

A

(on four corners)

Filters (3)

Rear panel: 7 screws on each

Filter cover

Rear panel: 8 screws

Side panel: 14 screws

A

(on four corners)

Front panel:
2 hinges on each

Side panel:
14 screws

Bolt

Screw

Pull these pins up and down respectively
to remove the front panel.

Bolt

Screw

Detailed vie w of section A

< Model 500 >

Heat exchanger
unit (top)

Fan unit
(bottom)

Height (mm)

1120+510

*1

860

<Dimensions and weight of parts>

* Length of protruded pipe (removable)

Width (mm)

P250:1380
P500:1980

P250:1380
P500:1980

Depth (mm)

780

780

Weight (kg)

P250:158
P500:246

P250:128.5
P500:159

[Fig.1]

The top and the bottom of the unit can be separated.

(Requires brazing)

When separating the top and the bottom of the unit, perform the work on a level

surface.

Follow the procedures below when separating the sections.

Necessary tools and materials:

Ratchet wrench with a socket size of 17 mm (for M10)
General tools
Cable ties (for wires)
Gray vinyl tape (for pipes)
Supporting wood piece Height 800 mm x width 100 mm x thickness 20 (mm)

1 piece

(1) Removing the decoration panel and filter
<Model 250>

Remove the front panels (2), rear panels (2), and the side panels (2) in this

order by removing the hinges and the screws on the unit as shown in [Fig.1].

Open the filter cover and remove the filters (2 filters).

<Model 500>
Remove the front panels (4), rear panels (3), and the side panels (2) in this

order by removing the hinges and screws on the unit as shown in [Fig.1].

Open the filter cover and remove the filters (3 filters).

(2) Disconnecting the electric wires

Disconnect the wiring connectors from the remote controller, thermistor, float

switch, lamp , and linear expansion valve as shown in [Fig.2].

After removing the connectors, pull out the wires from the control box.
Unclamp the wires from the frame.
Put all wires together in a bundle on the unit.

(3) Removing the drain hose and the pipes from the brazed section of the pipe

Remove the drain hose by unscrewing the screws on both ends of the hose

band.

Peel off the pipe cover on the pipe so that the torch flame will not reach the

cover. Remove the pipe from the brazed section as shown in [Fig.3].

*Protect the section around the area to be worked on from the torch flame

(drain pan, wiring, insulation material on the frame etc).

1

2

(4) Separate the top and the bottom of the unit

Unscrew the screws and loosen bolt that are marked with the letter A in
Loosen bolt

[Fig.1] (on f our corners)

loose enough to allow the top and

the bottom of the unit to be separated. Be sure to re-tighten bolt after sepa

and bottom (Tightening torque:

rating the top

74N.m).

Separation work is now complete. Exercise caution not to damage or scratch the

unit during transportation or get your fingers caught between the units.

1

2

2

[ IV Indoor Unit Components ]

- 56 -

HWE1018A GB

Clamp

Clamp

Linear expansion valve wiring

Thermistor wiring

Float switch wiring

Lamp wiring

Remote controller wiring

No. 2

No. 1

[Fig.2]

<Model 500>

<Model 250>

(the wire from the lamp assy.)

Bend the wire once, and fix the wire.

Fix the wire from the fan motor.

Connect the wire from the lamp assy.

Connect the wire from the lamp assy.

[ IV Indoor Unit Components ]

- 57 -

HWE1018A GB

Drain pan

Heat exchanger
(gas pipe)

Heat exchanger
(liquid pipe)

Unbraze these sections
(2 places on the gas pipe
/upper part of the strainer)

Heat exchanger
(liquid pipe)

Heat exchanger
(gas pipe)

Drain pan

<Model 500>

<Model 500>

<Model 250>

<Model 250>

Unbraze these sections
(2 places on the liquid pipe
/upper part of the strainer)

[Fig. 3]

To p

Bottom

Bottom section of the unit

Top section of the unit Bottom section of the unit Top section of the unit

Bottom Bottom Bottom

To p To p To p

Control box

Motor

Control box

Motor

Fan

Supporting

wood piece

Supporting

wood piece

Heat exchanger

Piping side

Heat exchanger

Piping side

Fan

Note

1. Peel off the pipe cover carefully. The cover will be needed again when putting the units together.

2. When loading the unit on an elevator, place the separated sections upright as shown below.
(Place the right side up.) Place a piece of wood at the bottom of the bottom section for support to keep it level.

Unbraze this section
(1 place on the liquid pipe/
upper part of the strainer)

Unbraze these sections

(2 places on the gas pipe/

expanded part)

[ IV Indoor Unit Components ]

- 58 -

HWE1018A GB

Caution

To put the top and bottom sections of the unit together, follow the procedures above in the reverse order.

Use a hand-lift truck to transport the units; they are heavy even when the top and button sections are separated.

Carrying the units by hand is dangerous and may result in personal injury if the units fall or topple over.
Exercise caution not to get your fingers caught when separating or assembling the top and bottom sections of
the unit.

Check to make sure that the frame is perpendicular to the horizontal plane before putting the panels together.
When the frames will not fit back into place, loosen bolt 2 as shown in [Fig.1], place the frames, and tighten bolt 2 .

Keep torch flame away from the insulation material on the drain pan and from other flammable materials when
performing brazing work. Use the shielding board that is supplied.

Be sure to securely tighten all screws and bolts. (tightening torque: 74N.m)

Perform a test run and check for abnormal sound, rattling, and water leaks.

Using [Fig.4] and Table 1 as a reference, connect all connectors correctly.
Use a cable tie and bundle the wires as they were before.

<Model 250>

No. 1 board

Connector location on the board

CN60

CN31
CN20
CN21

CN29
CN22

Connector location on the board Connector location on the adapter board

No. 1 board

CN31
CN20
CN21

CN29

*Same with the No. 2 board

LEV2B

LEV2A

<Model 500>

Board No.

No.1

Connector

CN31

CN20

CN21

CN29

CN60

Table 1

Table 1

Wire

mark

1

S1

E1

G1

V1

Connector

color

White

Red

White

Black

White

No. of

pins

3

2

2

2

6

Parts name

Float switch

Inlet thermistor

Liquid pipe thermistor

Gas pipe thermistor

Linear expansion valve

Board No.

No.1

No.2

Connector

CN31

CN20

CN21

CN29

LEV2A

CN31

CN20

CN21

CN29

LEV2B

Wire

mark

1

S1

E1

G1

V1

2

S2

E2

G2

V2

Connector

color

White

Red

White

Black

White

White

Red

White

Black

White

No. of

pins

3

2

2

2

6

3

2

2

2

6

Parts name

Float switch

Inlet thermistor

Liquid pipe thermistor

Gas pipe thermistor

Linear expansion valve

Float switch

Inlet thermistor

Liquid pipe thermistor

Gas pipe thermistor

Linear expansion valve

[Fig. 4]

[Fig. 4]

- 59 -

HWE1018A GB

V Electrical Wiring Diagram

[1] Electrical Wiring Diagram of the Outdoor Unit ................................................................. 61

[2] Electrical Wiring Diagram of the Indoor Unit .................................................................... 62

- 60 -

HWE1018A GB

[ V Electrical Wiring Diagram ]

- 61 -

HWE1018A GB

V Electrical Wiring Diagram

[1] Electrical Wiring Diagram of the Outdoor Unit

1. Electrical wiring diagram of the outdoor unit
(1) PUHY-P250YJM-A

+-

++++

2

1

+

++

++

3

3

2

2

Heat exchanger capacity control

Cooling/Heating switching

21S4b

63HS1

SV9

SV5b

For opening/closing the bypass

circuit under the O/S

21S4a 4-way valve

Explanation

Symbol

63H1

63LS

Pressure

sensor

Pressure

switch

High pressure protection for the

outdoor unit

Discharge pressure

Low pressure

72C

Magnetic relay(inverter main circuit)

Current sensor(AC)

Crankcase heater(for heating the compressor)

CH11

CT12,22,3

HIC bypass,Controls refrigerant

flow in HIC circuit

Solenoid

valve

Linear

expansion

valve

LEV1

LEV2

SV1a

DCL DC reactor

Pressure control,Refrigerant flow

rate control

TB1

TB3

TB7

Terminal

block

Central control transmission

cable

Indoor/Outdoor transmission

cable

Power supply

TH2

TH3

TH4

TH5

TH6

TH7

THHS

Function setting connector

IPM temperature

OA temperature

Subcooled liquid refrigerant

temperature

ACC inlet pipe temperature

Discharge pipe temperature

Subcool bypass outlet

temperature

Thermistor

Z24,25

Pipe temperature

Outdoor unit heat exchanger

capacity control

For opening/closing the bypass

circuit

153

6

3

CN3

green

1

N

N

L

N

TB24

*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 remove 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.

L3

L1

L2

Power Source

3N~

50/60Hz

380/400/415V

21S4b

CN501

X01

1

3

X09

3

6

CN508

black

Unit address

setting

CN504

green

CT12

C31

C33

CN5

red

D1

R4

Z5

1

SV9

R631

white

TH2

t

°

C8

red

CNIT

yellow

CNS2

t

°

1

1

LED1

Display

setting

CN51

12V

Function

setting

SW1

10

1

CN212

CNTYP4

green

F4

AC250V

6.3A T

R5

F3

F1

Z4

R2

F2

*3

3

2

Compressor ON/OFF output

Error detection output

CN201

Z25

1

4

1

1

1

TH3

Z3

3

Z2

U

ONOFF

SW2

10

1

SWU2

LED1

C4

C35

C37

R31

R33

R30

ON

SW3

10

Control Board

TH7

CN40

63HS1

CN41

TH6

t

°
t

TH4

3

2

2

2

1

SW5

LED3:Lit when powered

1

3

4

R32

2

Z1

1

DSA

C10

R34 R35

LEV1

LEV2

C36

3

C34

SC-V

CT22

SC-U

V

1

CN4

blue

red

1

M

1

1

t

LED3:CPU in

operation

black

4

1

CNTYP2

black

3

6

yellow

CN3K

*3

3

M

C3

TB21

C1

R3

3

CN1A

5

U

CN2

blue

CN3N

5

6

C7

U

44

R1

CN21

blue

TB1

1

CN1B

3

TB7 Power

selecting

connector

CN102

CNVDC

3

2

1

IPM

2

1

U

4

TP1

W

L3

DCL

V

black

72C

white

red

321

ON

OFF

1

M-NET power

supply circuit

123

C6

M-NET Board

12

1

Power failure

detection circuit

1

CNAC2

black

CN502

5

Indoor/Outdoor

transmission

cable

INV Board

red

3

CNT01

TB23

L2L1

U

4

1

ON

1

2

1's

digit

THHS

1

CNIT

red

S

2

1

1

CN990

1

3

W

TB3

10's

digit

OFF

LED2:CPU in operation

5

2

CNS2

yellow

TB7

1

CNDC

pink

M1

2

2

red

6

MS

3~

1

1

t

C100

*5

3

3

U

1

4

LED1:Power supply to

Indoor/Outdoor

transmission line

ZNR01

M2

32

M1

black

Central control

transmission

cable

*6

SC-L1

1

4

C2

C9

ON

C5

OFF

FT-N

R5

M

3~

Motor

(Compressor)

°

CN5V

yellow

5

2

3

3

3

red

CN3S

1

1

CN04

red

1

CN2

2

3

CN4

X05

2

2

Fan motor

(Heat exchanger)

SC-P2

P

1

CN211

CN202

red

TH5

°

N

CN1

M2

2

TP2

LED1:Normal operation(Lit)

/ Error(Blink)

2

CN503

blue

5

X04

4

*4

SC-W

U

C32

SC-L3

CH11

CN506

1

2

CN72

red

3

P

63H1

CN801

yellow

1

2

CN332

blue

F1,F2,F3

AC250V

6.3A T

21

OFF

SW4

10

1

CNT02

11

CN3D

432

1

21

CPU power

supply circuit

CNAC

red

2

1

F01

AC250V

3.15A T

1

t

ONOFF

10

SWU1

white

CN213

red

SC-L2

3

Z24

7

4

°

3 21122

7

1

2

CN5

1

CN4

red

CNINV

3

4

R630

1

1

C630

3

CN22

red

C631

5

F01

DC700V

4A T

1

CNTYP5

green

4

LED2:Error

21S4a

1

LED1:Normal

operation

2

3

2

U

X02

X03

CN18V

blue

5

1

7

CN4

3

CN6

2

°

IPM

4

SC-P1

FT-P

black

C30

red

DB1

CT3

72C

C1

CN2

CNTYP

black

R1

black

TB22

6

3

RSH1

CN102

3

R6

C11

1

1

1

FAN Board

63LS

ZNR1

U

3

Noise

Filter

SV5b

red

CNLVA

CNLVB

red

12345

6

white

black

SV1a

6

432

1

2

1

L1 L2 L3

CN215

black

<Symbol explanation>

[ V Electrical Wiring Diagram ]

- 62 -

HWE1018A GB

[2] Electrical Wiring Diagram of the Indoor Unit

1. PFD-P250VM-E

u

Note: 1. The dotted lines show field wiring.

2. The address setting of the indoor unit should always be odd.

3. The outdoor unit to which the indoor unit is connected with the transmission line,

the address of the outdoor unit should be the indoor unit +50.

4. Mark indicates terminal bed, connector, board insertion connector

or fastening connector of control board.

0

F

E

D

C

B

A

9

0

9

8

7

6

5

4

3

2

1

9

1

2

3

4

5

6

7

8

0

8

7

6

5

4

3

2

1

2121

7123456

CN7V

CN24 CN25

X11

SW8

SW4

SW11

(1st digit)

SW12

(2nd digit)

SW14

SW7 SW2 SW1SW3

SWC SW5

Address

(odd)

1234561232121212112

T

CN3T

3

CN28 CN31CN29CN20 CN21 CN60CN22

Z3

33P1

97513131311

CNT CND

CN90CN33

CNP

5432

1

65432

CN51

1

CN52

Dehumidify

ZNR901

DSA1

CN3A

ZNR1

F901

X06 X05

X04

321

2

CN32

321

X01

CN2M

I.B.

1

X07

Z1

Inside section of control box

RC

2

1

2

1

TB15

Failure output

Distant location on/off

<no voltage or current>

Status output

Distant location on/off

<with voltage and current>

Power supply DC30V, AC100/200V

Switch(normal/local)

Power supply DC12~24V

Power supply

380/400/415V(50Hz)

400/415V(60Hz)

DC24~30V

Indoor unit

Control wiring

LED display(failure)

LED display(status)

LED display(power supply)

3N~

LED display(check)

SW9

234515432

1

B2B1BCA2A1

AC

54321

C

IFB

3

L3

A1SB1

L2

L1

X11

1

2

216

5

1

2

PE

N

F1

345

6

3

1

ZNR1

3

1

CN1

DSA1

PE

TB23

TB21

L

L

TB22

CN53

TB2

S.B.

CN54

L3

TB5

SHIELD

L2

L1

L4

FAN

over current

detection

51F

Z1

ZNR2

52F

Z3

51F

52F

MF

TH24

TH21

TH22

TH23

65432

1

LEV

SYMBOL

NAME

DSA1

Surge absorber

LED display (power supply)

F901

ZNR1, ZNR2, ZNR901

MF

I.B.

S.B.

IFB

TB2

TB5

TB15

TB21

TB22

TB23

F1TLEV

52F

51F

33P1

RC

L4

L3

L2

L1

Z3

Z1

X11

SWC(I.B.)

SW14(I.B.)

SW12(I.B.)

SW11(I.B.)

SW9

SW4(I.B.)

SW3(I.B.)

SW2(I.B.)

SW1(I.B.)

Surge absorber board

Switch (outlet/inlet temp.control)

Float switch

Fuse<6-3/6A>

Varistor

Transformer

Electronic linear expan.valve

Contactor(fan I/D)

Over current relay (fan I/D)

Fuse<5A>

Thermistor (inlet temp.detection)

Switch (connection No.set)

Switch (for mode selection)

Switch (for capacity code)

Switch (for mode selection)

Switch (for model selection)

Auxiliary relay(check)

LED display (failure)

LED display (status)

LED display (check)

Switch (normal/local)

TH24

TH23

TH22

TH21

Switch (1st digit address set)

Switch (2nd digit address set)

Fan motor

Indoor controller board

Power source terminal bed

Transmission terminal bed

External input/output board

Transmission terminal bed

MA Remote controller

Terminal bed for distant location on/off

<With voltage and current>

Terminal bed for distant location on/off

<No voltage or current>

Auxiliary relay(fan failure detection)

Auxiliary relay(fan)

Thermistor (piping temp.detection/gas)

Thermistor (piping temp.detection/liquid)

Thermistor (outlet temp.detection)

Terminal bed for distant location display

External input adapter

(PAC-SA88HA)

CN52

5(green)

1(brown)

Z

Indoor unit

control board

Relay circuit

The signal input of the dehumidify order is to

connect wiring referring to the bottom figure.

SW

Power

Distant control panel

SW:Defumidify order

(field supply

and construction)

Z

Z:Relay (Contact : Minimum applicable load

DC12V 1mA or less)

u

u

u

t

ttt

[ V Electrical Wiring Diagram ]

- 63 -

HWE1018A GB

2. PFD-P500VM-E

ttt

t

ttt

t

1. The dotted lines show field wiring.

2. It is wiring for 1 refrigerant system at the time of shipping.

Change wiring and SW2, 3, 4 (No.1&No.2) as this figure in field

when you change it to 2 refrigerant circuit

3. Set up the address of No.1 board in the odd number, and set up the

address of No.2 board in the even number.

But, set up the address of the No.2 board in the No.1 board +1.

4. The outdoor unit to which the indoor unit is connected with the

transmission line, the address of the outdoor unit should be the

indoor unit +50.

5. Mark indicates terminal bed, connector, board insertion connector

or fastening connector of control board.

Note:

SW8

SW4 SW7 SW2

SWC SW5

0

F

E

D

C

B

A

9

0

9

8

7

6

5

4

3

2

1

9

1

2

3

4

5

6

7

8

0

8

7

6

5

4

3

2

1

6574321CN24 CN25

1

2

2
1

X11

CN7V

Address

(odd)

SW11

(1st digit)

SW12

(2nd digit)

SW14

No.1

CN51

CN52

Dehumidify

13

45

1

2

3

45

2

ZNR901

DSA1

ZNR1

F901

X06 X05 X04X01 X07

CN3A

CN32

CN2M

I.B.1

3212321

1

591513731

CNT

CND

CN90

13

CN33CNP

31

Z1

T

CN3T

31

CN28

21

CN31

12321

CN29

3222

1

11

CN20

CN21

CN60

CN22

21 654

Z3

33P1

SW1SW3

TH24-1

TH21-1

TH22-1

TH23-1

LEV2

LEV1

12345

6654321

AD.B.

6543 126543 12

6543 12

LEV1A

LEV1B

LEV1

2

1

Inside section of control box

RC

2

1

TB15

A1SB1

216

5

DC24~30V

No.1 Indoor unit

Control wiring

LED display(No.1 failure)

LED display(status)

TB5-1

SHIELD

L3

L1

1

3

ZNR1

3

1

CN1

DSA1

S.B.

3

L3

L2

L1

1

2

N

F1

Power supply

3N~

380/400/415V(50Hz)

400/415V(60Hz)

LED display(power supply)

PE

TB2

L5

345

6

Switch(normal/local)

SW9

No1.Failure output

Distant location on/off

<no voltage or current>

No1.Status output

Distant location on/off

<with voltage and current>

No2.Status output

No2.Failure output

Power supply DC30V, AC100/200V

Power supply DC12~24V

LED display(No.2 failure)

DC24~30V

No.2 Indoor unit

Control wiring

LED display(check)

L4

L2

L

L

L

L

54321

S

A2

B2

B2B1BCA2A1

AC

54321

C

IFB

CN54

TB22

CN53

TB21

TB23

SHIELD

TB5-2

3

4

X11

1

2

PE

X12

<note2>

CN3A1CN2M

123

CN32

213

2

123

1

I.B.2

54321

CN52

54321

CN51

Dehumidify

ZNR901

F901

ZNR1

DSA1

X01

X07

X04X05X06

CNP CN33

CN90

CND

CNT

CN3T

12

CN22 CN21CN20

1122

CN29

12321

CN31

12

CN28

531

CN60

1234563113 731 51139

Z2

<note2>

33P2

T

Z3

CN25CN24

12 CN7V

1234567

21

X12

SW5

SWC

SW12

(2nd digit)

SW11

(1st digit)

SW8

Address

(odd)

SW3 SW1SW2SW7SW4

SW14

0

F

E

D

C

B

A

9

0

9

8

7

6

5

4

3

2

1

9

1

2

3

4

5

6

7

8

0

8

7

6

5

4

3

2

1

No.2

FAN

over current

detection

51F

Z1

ZNR2

Z2

52F

Z3

TH24-2

TH21-2

TH22-2

TH23-2

51F

52F

MF

NAME

SYMBOL

Surge absorber

DSA1

L5

ZNR1, ZNR2, ZNR901

LED display (No.2 failure)

LED display (status)

LED display (check)

LED display (power supply)

MA Remote controller

RC

TB21

TB15

TB5-1, -2

TB2

IFB

S.B.

AD.B.

I.B.1, I.B.2

MF

Surge absorber board

Switch (outlet/inlet temp.control)

Float switch

Varistor

Transformer

Electronic linear expan.valve

Contactor(fan I/D)

Over current relay (fan I/D)

Thermistor (inlet temp.detection)

Switch (connection No.set)

Switch (for mode selection)

Switch (for capacity code)

Switch (for mode selection)

Switch (for model selection)

Auxiliary relay(check)

LED display (No.1 failure)

Switch (normal/local)

TH24-1, TH24-2

SW1(I.B.)

SW2(I.B.)

SW3(I.B.)

SW4(I.B.)

SW11(I.B.)

SW12(I.B.)

SW14(I.B.)

SWC(I.B.)

X11, X12

Z1, Z2Z3L1L2L3

L4

SW9

TH23-1, TH23-2

TH22-1, TH22-2

TH21-1, TH21-2

33P1, 33P2

51F

52F

LEV1, 2

T

F1

F901

TB23

TB22

Switch (1st digit address set)

Switch (2nd digit address set)

Fan motor

Indoor controller board

Adapter board

Power source terminal bed

Transmission terminal bed

External input/output board

Transmission terminal bed

Terminal bed for distant location on/off

<With voltage and current>

Terminal bed for distant location on/off

<No voltage or current>

Auxiliary relay(fan failure detection)

Auxiliary relay(fan)

Thermistor (piping temp.detection/gas)

Thermistor (piping temp.detection/liquid)

Thermistor (outlet temp.detection)

Terminal bed for distant location display

Fuse <6.3/6A>

Fuse <5A>

(field supply

and construction)

Power

SW

Indoor unit

control board

Z

1(brown)

5(green)

CN52

The signal input of the dehumidify order is to

connect wiring referring to the bottom figure.

Relay circuit

External input adapter

(PAC-SA88HA)

SW:Defumidify order

Z:Relay (Contact : Minimum applicable load

DC12V 1mA or less)

Distant control panel

Z

How to connect in case of 2 refrigerant circuit.

Remove the LEV1B connector

from AD.B. board, and

connect it to CN60 of

I.B.2 board.

Connect a connector to

CN3A, CN2M of I.B.2

board.

<note2>

65432

1

CN60

654321

CN3A

CN2M

I.B. 2

12321

LEV2

<note2>

How to set up to SW2, 3, 4.

(In case of 2 refrigerant circuit)

PFD-P500VM-E

(at the time of shipping)

ON

654321

ON

65432110987

ON

54321ON5432110987

ON

654321

ON

654321

2 refrigerant

circuit

1 refrigerant

circuit

SW2 SW3 SW4

External input-output

board (IFB)

The case of with-voltage input

...

A

The case of no-voltage input

....

B

When using the external input function on the indoor unit

that is connected to a two-refrigerant circuit, connect the

short-circuit plate that is supplied with the unit to the

appropriate terminals on the external input-output board.

ACA1A2BCB1

B2

A

B

TB23

TB21

u

u

u

u

u

u

[ V Electrical Wiring Diagram ]

- 64 -

HWE1018A GB

- 65 -

HWE1018A GB

VI Refrigerant Circuit

[1] Refrigerant Circuit Diagram ............................................................................................. 67

[2] Principal Parts and Functions .......................................................................................... 70

- 66 -

HWE1018A GB

[ VI Refrigerant Circuit ]

- 67 -

HWE1018A GB

VI Refrigerant Circuit

[1] Refrigerant Circuit Diagram

1. System with one refrigerant
(1) PUHY-P250YJM-A

SCC (HIC Circuit)

LEV1

SV1a

ACC

63HS1

21S4a

ST3

ST6

63H1

CJ2

ST7

TH4

TH2

TH3

TH7

TH6

21S4b

TH5

CP1

CJ1

63LS

SV5b

COMP

O/S

CV1

LEV2

ST1

ST2 BV2

BV1

SV9

CP2

TH23

TH22

[ VI Refrigerant Circuit ]

- 68 -

HWE1018A GB

(2) PUHY-P500YSJM-A

LEV1

SV1a

ACC

63HS1

21S4a

ST3

ST6

63H1

CJ2

ST7

TH4

TH2

TH3

TH7

TH6

21S4b

TH5

CP1

CJ1

63LS

SV5b

COMP

O/S

CV1

LEV2

ST1

ST2 BV2

BV1

SV9

CP2

TH22

LEV1

SV1a

ACC

63HS1

21S4a

ST3

ST6

63H1

CJ2

ST7

TH4

TH2

TH3

TH7

TH6

21S4b

TH5

CP1

CJ1

63LS

SV5b

COMP

O/S

CV1

LEV2

ST1

ST2 BV2

BV1

SV9

CP2

TH23

Gas twinning
pipe

Liquid twinning
pipe

SCC

(HIC circuit)

SCC

(HIC circuit)

[ VI Refrigerant Circuit ]

- 69 -

HWE1018A GB

2. System with two refrigerant circuits
(1) PUHY-P250YJM-A x 2

SCC

(HIC Circuit)

LEV1

SV1a

ACC

63HS1

21S4a

ST3

ST6

63H1

CJ2

ST7

TH4

TH2

TH3

TH7

TH6

21S4b

TH5

CP1

CJ1

63LS

SV5b

COMP

O/S

CV1

LEV2

ST1

ST2 BV2

BV1

SV9

CP2

TH22-1

SCC

(HIC Circuit)

LEV1

SV1a

ACC

63HS1

21S4a

ST3

ST6

63H1

CJ2

ST7

TH4

TH2

TH3

TH7

TH6

21S4b

TH5

CP1

CJ1

63LS

SV5b

COMP

O/S

CV1

LEV2

ST1

ST2 BV2

BV1

SV9

CP2

TH23-1

TH22-2

TH23-2

[ VI Refrigerant Circuit ]

- 70 -

HWE1018A GB

[2] Principal Parts and Functions

1. Outdoor unit

Part

name

Symbols

(functions)

Notes Usage Specifications Check method

Com­pressor

MC1
(Comp1)

Adjusts the amount of circulating
refrigerant by adjusting the operat­ing frequency based on the oper­ating pressure data

250 models
Low-pressure shell scroll
compressor
Wirewound resistance
20°C[68°F] : 0.981ohm

High
pres­sure
sensor

63HS1 1) Detects high pressure

2) Regulates frequency and pro­vides high-pressure protec­tion

Low
pres­sure
sensor

63LS 1) Detects low pressure

2) Provides low-pressure pro­tection

Pres­sure
switch

63H1 1) Detects high pressure

2) Provides high-pressure pro­tection

4.15MPa[601psi] OFF setting

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

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

0.173V/0.098 MPa [14psi]
Pressure [MPa]
=0.566 x Vout [V] - 0.283
Pressure [psi]
=(0.566 x Vout [V] - 0.283) x 145

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

Con­nector

63LS

1

123

2
3

[ VI Refrigerant Circuit ]

- 71 -

HWE1018A GB

Thermis­tor

TH4
(Discharge)

1) Detects discharge air temper­ature

2) Provides high-pressure pro­tection

Degrees Celsius Resistance

check

0°C[32°F] :698kohm
10°C[50°F] :413kohm
20°C[68°F] :250kohm
30°C[86°F] :160kohm
40°C[104°F] :104kohm
50°C[122°F] : 70kohm
60°C[140°F] : 48kohm
70°C[158°F] : 34kohm
80°C[176°F] : 24kohm
90°C[194°F] :17.5kohm
100°C[212°F] :13.0kohm
110°C[230°F] : 9.8kohm

TH2 LEV 1 is controlled based on the

TH2, TH3, and TH6 values.

Degrees Celsius

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

Resistance
check

TH3
(Pipe
temperature)

1) Controls frequency

2) Controls defrosting during
heating operation

3) Detects subcool at the heat
exchanger outlet and controls
LEV1 based on HPS data
and TH3 data

TH7
(Outdoor tem­perature)

1) Detects outdoor air tempera­ture

2) Controls fan operation

TH5 LEV2a and LEV2b are controlled

based on the 63LS and TH5 val­ues.

TH6 Controls LEV1 based on TH2,

TH3, and TH6 data.

THHS
Inverter
heat sink tem­perature

Controls inverter cooling fan
based on THHS temperature

Degrees Celsius

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

Sole­noid
valve

SV1a
Discharge-suc­tion
bypass

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

2) High-pressure-rise preven­tion

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

Continuity
check with a
tester

SV5b
Heat
exchanger
capacity control

Controls outdoor unit heat ex­changer capacity

AC220-240V
Closed while being powered/
open while not being powered

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

closed while not being pow­ered

Part

name

Symbols

(functions)

Notes Usage Specifications Check method

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

[ VI Refrigerant Circuit ]

- 72 -

HWE1018A GB

Linear
expan­sion
valve

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)

Same as in­door LEV
The resistance
value differs
from that of the
indoor LEV.
(Refer to the
section "LEV
Troubleshooti
ng."(page 185
))

LEV2
(Refrigerant
flow adjust­ment)

Adjusts refrigerant flow during
heating

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

Same as in­door LEV

Heater CH11 Heats the refrigerant in the com-

pressor

Cord heater AC240V
P250 model
1511 ohm 35W

Resistance
check

4-way
valve

21S4a Changeover between heating and

cooling

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

Continuity
check with a
tester

21S4b 1) Changeover between heating

and cooling

2) Controls outdoor unit heat ex­changer capacity

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

FAN
motor

FAN motor Regulates the heat exchanger ca-

pacity by adjusting the operating
frequency and operating the pro­peller fan, based on the operating
pressure

AC342V, 50.5Hz, 920W

Part

name

Symbols

(functions)

Notes Usage Specifications Check method

[ VI Refrigerant Circuit ]

- 73 -

HWE1018A GB

2. Indoor unit

Part

name

Symbols

(functions)

Notes Usage Specifications Check method

Linear ex­pansion
valve
(LEV)

LEV 1) Adjusts superheat at the

heat exchanger outlet of the
indoor unit during cooling

2) Adjusts subcool at the heat
exchanger outlet of the in­door unit during heating

DC12V
Opening of a valve driven by
a stepping motor
0-(2000) pulses

Continuity check
with a tester
Continuity be­tween white, red,
and orange.
Continuity be­tween yellow,
brown, and blue.

Thermis­tor

TH21
(Suction
air tem­perature)

Indoor unit control (Thermo)

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

Resistance check

TH22
(Pipe tem­perature)

Indoor unit control (Freeze pre­vention, Pre-heating stand-by)

TH23
(Gas pipe
tempera­ture)

LEV control during cooling oper­ation (Superheat detection)

TH24
(Dis­charge air
tempera­ture)

Controls indoor unit discharge
(thermostat)

Float
Switch

33P1 Detects drain pan water level Contact Resistance:

Under 250 mohm
B contact type

Continuity check
with a tester

33P2 P500

model
only

Motor MF Sends air PFD-P250VM-E

AC380~415V Type E 4P
Output 3.7kW

Rotation number
check
Standard 930rpm

PFD-P500VM-E
AC380~415V Type B 4P
Output 5.5kW

Rotation number
check
Standard 978rpm

YellowMBlueBrown

White

Red

Orange

R = 15k

0

R = 3460
R = 15

0/80

t

3460

273 t

1

273

1

exp

[ VI Refrigerant Circuit ]

- 74 -

HWE1018A GB

- 75 -

HWE1018A GB

VII Control

[1] Functions and Factory Settings of the Dipswitches ......................................................... 77

[2] Controlling the Outdoor Unit ............................................................................................ 82

[3] Controlling the Indoor Unit ............................................................................................... 94

[4] Operation Flow Chart....................................................................................................... 98

- 76 -

HWE1018A GB

[ VII Control ]

- 77 -

HWE1018A GB

VII Control

[1] Functions and Factory Settings of the Dipswitches

1. Outdoor unit
(1) Control board

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 either the OC or OS needs to be set for the setting to be effective on both units.
B: The switches on both the OC and OS need to be set to the same setting for the setting to be effective.
C: The setting is effective for the unit on which the setting is made.

3) Refer to "VII [2] Controlling the Outdoor Unit" for details.(page 82)

Switch Function

Function according to switch setting Switch setting timing

Units that re-

quire switch

setting
Note.2

OFF ON OFF ON OC OS

SWU 1-2 Unit address setting Set to 51-100 with the dial switch Before power on C C

SW1 1-10

For self-diagnosis/
operation monitoring

Refer to the LED monitor display on the
outdoor unit board.

Anytime after power on

CC

SW2

1- - - - --

2

Deletion of connec­tion information

Normal control Deletion Before power on

A-

3

Deletion of error his­tory SW

(OC) Storage of IC/
OC error history

(OC) Deletion of IC/
OC error history

Anytime after power on
(When switched from OFF
to ON)

CC

4 Pump down mode Normal control Pump down mode

After being energized and
while the compressor is
stopped

A-

5- - - - -­6- - - - --

7

Forced defrost
Note 3

Normal control

Forced defrost
starts

10 minutes
after com­pressor
startup

Anytime af­ter power
on (When
switched
from OFF to
ON)

AA

8

Defrost timer setting
Note 3

50 minutes 90 minutes

Anytime after power on
(When switched from OFF
to ON)

BB

9- - - - --

10 - - - - - -

[ VII Control ]

- 78 -

HWE1018A GB

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 either the OC or OS needs to be set for the setting to be effective on both units.
B: The switches on both the OC and OS need to be set to the same setting for the setting to be effective.
C: The setting is effective for the unit on which the setting is made.

3) The noise level is reduced by controlling the compressor frequency and outdoor fan rotation speed.
Setting of CN3D is required.(page 23)

4) Set this switch back to OFF (°C) at the completion of maintenance.

Switch Function

Function according to switch setting Switch setting timing

Units that re-

quire switch

setting
Note.2

OFF ON OFF ON OC OS

SW3

1

Test run mode: en­abled/disabled

SW3-2 disabled SW3-2 enabled Anytime after power on A -

2

Test run mode: ON/
OFF

Stops all ICs

Sends a test-run
signal to all ICs

After power on and when
SW3-1 is on.

A-

3

Defrost start temper­ature

-10°C [14°F] -5°C [23°F] Anytime after power on B B

4

Defrost end temper­ature

10°C [50°F] 5°C [41°F]

Anytime after power on
(except during defrost op­eration)

BB

5- - - - --

6

Temperature unit se­lection

Centigrade

Fahrenheit
Note 4

Any time after being pow­ered

CC

7- - - - -­8- - - - --

9 Model setting

Outdoor standard
static pressure

Outdoor high static
pressure

Before being energized C C

10 Model setting

High static pressure
60Pa

High static pressure
30Pa

Before being energized C C

SW4

1- - - - -­2- - - - --

3

Refrigerant amount
adjustment

Normal operation
mode

Refrigerant amount
adjust mode

Anytime after being ener­gized (except during ini­tial startup mode.
Automatically cancelled
60 minutes after com­pressor startup)

A-

4

Low-noise mode/
step demand switch­ing

Low-noise mode
Note 3

Step demand mode Before being energized C C

5- - - - --

6

Cumulative com­pressor operation
time data deletion

Cumulative com­pressor operation
time data is re­tained.

Cumulative com­pressor operation
time data is delet­ed.

Anytime after power on
(when the unit is turned
on)

CC

7- - - - -­8- - - - -­9- - - - --

10

Dehumidifying oper­ation priority
mode:Enable/Dis­able

Enabled Disabled

Anytime after being
powered

A-

[ VII Control ]

- 79 -

HWE1018A GB

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 either the OC or OS needs to be set for the setting to be effective on both units.
B: The switches on both the OC and OS need to be set to the same setting for the setting to be effective.
C: The setting is effective for the unit on which the setting is made.

3) When set to the capacity priority mode and if the following conditions are met, the Low-noise mode will terminate, and the unit
will go back into the normal operation mode.
Cooling: Outside temperature is high or high pressure is high.

4) The table below summarizes the factory settings for dipswitches SW5-1 through SW5-4, and SW5-7. The factory setting for
all other dipswitches is OFF.

(2) INV board

Functions are switched with the following connector.

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.

Switch Function

Function according to switch setting Switch setting timing

Units that re-

quire switch

setting
Note.2

OFF ON OFF ON OC OS

SW5

1

Model selection See the table below (Note 4) Before being energized C C

2
3
4

5

Low-noise mode
selection

Capacity priority
mode Note 3

Low-noise mode Before being energized A -

6- - - - -­7 Model selection See the table below Note 4 Before being energized B B

8- - - - -­9- - - - --

10

System rotation
control

No units are speci­fied as the control
unit

Control unit is spec­ified.

While the unit is stopped
(When the switch is turned
from OFF to ON)

A-

SW 5

model

12347

ON ON OFF OFF ON P250 model

Connector Function

Function according to connec-

tor

Setting timing

Enabled Disabled Enabled Disabled

CN6 short­circuit con-

nector

Enabling/disabling the following error
detection functions;
ACCT sensor failure
(5301 Detail No. 115)
ACCT sensor circuit failure
(5301 Detail No.117)
IPM open/ACCT erroneous wiring
(5301 Detail No. 119)
Detection of ACCT erroneous wiring
(5301 Detail No.120)

Error detec­tion enabled

Error detec­tion disable
(No load op­eration is pos­sible.)

Anytime after power on

[ VII Control ]

- 80 -

HWE1018A GB

2. Function of the switch (Indoor unit)

(1) Dipswitches

1) SW1,3

2) SW2,SW3-2,SW4

Switch Function

Function according to switch setting

OFF ON

Switch setting timing

OFF ON

Notes

SW1

SW3

SW7

1

2

3

4

5

6

7

8

9

10

1

2

3

4

1

2

3

4

5
6

7

9

10

8

Clogged filter detection

Filter check reminder
time setting

Remote display option

External input

Operation switching

Model setting

Capacity code

100h

Fan output

2500h

Thermo-ON signal

Available

Level

External input

Heat pump

MA remote controller

Cooling-only

Pulse

Not available Available

Not available Available

Not available Available

Refer to the combination with SW2

Not available

---

---

---

---

---

---

---

---

---

-

LEV setting conversion
function

Reset of the integrated
operation time
Valid/Invalid (fan belt)

Reset of the integrated
operation time
Valid/Invalid (fan motor)

--

---

---

-

--

-

--

While the unit is stopped
(Remote controller OFF)

Note 1. Setting timing for DIPSW 1 and 3 is during unit stoppage (remote controller OFF). It is not necessary to reset the settings by power-off.
Note 2. Settings in the shaded areas are factory settings.

Model System

Capacity code

SW3-2

123456

P250

50 OFF

ON

OFF

P500

Two-refrigerant circuit connection

One-refrigerant circuit connection

One-refrigerant circuit connection

50

OFF

SW2 SW4

12345

123456 12345

ON

OFF

ON

OFF

ON

OFF

*

100

ON

123456 12345

ON

OFF

ON

OFF

* The setting is changed at site under two-refrigerant circuit connection

<Capacity code and function setting>

If the capacity code or the model setting is changed upon replacement of the circuit board, power reset the indoor and outdoor units.

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HWE1018A GB

3) SW5

4) SW8

(2) Slide switches

3. Function of the switch <Remote controller>

(1) MA remote controller (PAR-20MAA)

The SW is located at the bottom of the remote controller under the cover. Operate the switches to perform the remote con­troller main/sub setting or other function settings. Normally, do not change the settings of switches other than the SW1 (main/
sub switching switch). (All the switches are set to "ON" at factory setting.)

Function

Switch setting timing

During unit stoppage (remote controller OFF)
(when switching from OFF to ON)

Reset of the integrated
operation time

Resetting the integrated operation time
according to the setting of SW7-1 and 7-2

Operation by switch setting

Anytime
after power on

1

Normal control

Compulsory thermo OFF

23

123

Compulsory thermo OFF setting during test run
(used in the grouped indoor units connected to
different outdoor units)

ON

OFF

ON

OFF

Function Operation by switch setting

Switch setting timing

Switch Function Operation by switch setting

Switch setting timing

SWC 1~2

Switching between
suction/discharge temperature
control

Anytime
after power on

Option

Standard

Option

Standard

Input setting

Suction temperature control

Discharge temperature control

*

* The settings for the two circuit boards must be equivalent to switch between suction/discharge temperature control under
two-refrigerant circuit system.

Remote controllerSwitching switch

1ON234

Switch

2

1

Function

Remote controller
main/sub setting

At power on of the
remote controller

Normal

startup

Timer mode

startup

3

Cooling/heating display
set by automatic setting

Displayed Not displayed

4

Suction temperature display
(discharge temperature display)

Displayed Not displayed

Operation by switch settings

Switch setting timing

ON OFF

Main Sub

Before power on

Before power on

Before power on

Before power on

When two remote controllers are connected
to one group, set either of the remote
controllers to "Sub".

To resume the operation with timer mode
after the power is restored when the
schedule timer is connected, set to
"Timer mode startup".

When the automatic mode is set and the
"Cooling"/"Heating" display is not necessary,
set to "Not displayed".

When the suction temperature (discharge
temperature) display is not necessary,
set to "Not displayed".

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HWE1018A GB

[2] Controlling the Outdoor Unit

-1- Outline of Control Method

The outdoor units are designated as OC and OS in the order of capacity from large to small (if two or more units have the

same capacity, in the order of address from small to large).

The setting of outdoor unit can be verified by using the self-diagnosis switch (SW1).

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.

-2- Startup sequence rotation (Single refrigerant circuit)

At the initial startup, outdoor units start up in the order of "OC and OS." When the cumulative operation time of the OC reaches

two hours, the OS will start up before the OC at the next start up.

Startup sequence rotation is performed while all the indoor units are stopped. (Even after two hours of operation, startup se-

quence rotation is not performed while the compressor is in operation.)

Refer to [-12- Control at Initial Start-up] for the initial startup.(page 87)
Performing startup sequence rotation does not change the basic operation of OC and OS. Only startup sequence is changed.
Startup sequence of the outdoor units can be checked with the self-diagnosis switch (SW1) on the OC.

-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 1 minute. This process will take approximately three minutes when it is per­formed for the first time.)

During the initial processing, the LED monitor on the outdoor unit's control board displays S/W version -> refrigerant type

-> heat pump -> cooling only and capacity -> and communication address in turn every second.

-4- Control at Start-up

The upper limit of frequency during the first 3 minutes of the operation is 50 Hz.
When the power is turned on, normal operation will start after the initial start-up mode (to be described later) has been com-

pleted (with a restriction on the frequency).

Display

SW1

ON

1 2 3 5 4 6 7 8 9 10

The unit is designated as the OC: “oc” appears on the display.
The unit is designated as OS: “oS-1” appears on the display

Display SW1

OC→OS: “oc” and the “OC” address appear alternately on the display.
OS→OC: “oS-1” and the “OS” address appear alternately on the display.

ON

1 2 3 5 4 6 7 8 9 10

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HWE1018A GB

-5- Bypass Control

Bypass solenoid valves (SV1a), which bypass the high- and low- pressure sides, perform the following functions.

(1) Bypass solenoid valve (SV1a) (ON = Open), (SV9) (ON = Open)

Operation

SV1a

ON OFF

When starting-up the compressor of each
outdoor unit

ON for 4 minutes.

After the restoration of thermo or 20 sec­onds after restart

ON for 4 minutes.

During cooling or heating operation with the
compressor stopped

Always ON.

Exception: OFF when 63HS1-63LS is 0.2 MPa [29 psi] or less

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
low pressure (63LS) drops (three or more
minutes after compressor startup)

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

When low pressure (63LS) ex­ceeds 0.38 MPa [55 psi].

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 63HS1 exceeds 3.50MPa

[507psi]

When 63HS1 is or below 2.70Mpa

[391psi]

When startup or resuming operation after a
defrost cycle

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

Others Always OFF

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HWE1018A GB

-6- Compressor Frequency Control

Depending on the capacity required, the frequency of the compressor is controlled to bring the evaporation temperature (Te)

close to the target evaporation temperature (Tem) during cooling operation, and to keep constant condensing temperature
(49°C[120°F] =2.88MPa[418psi]) during heating operation.

The target evaporation temperature (Tem) varies as follows during cooling operation depending on the capacity required.

When the capacity exceeds the needs : Tem is lowered.
When lacking in capacity : Tem is raised.
Minimum and maximum Tem Valued : -10°C[14°F] Tem < 25°C[77°F]

(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).

Model

Frequency/cooling (Hz) Frequency/heating (Hz)

Max Min Max Min

250 model 56 10 63 10

500 model 112 10 126 10

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HWE1018A GB

-7- Defrost Operation Control

(1) Starting the defrost operation

The defrost cycle starts when the pipe temperature (TH3) at or below the value in the table below has continuously been de-

tected for three minutes after the cumulative compressor operation time of 50 minutes have passed (90 minutes when the
defrost prohibit timer is set to 90 minutes.).

If 10 minutes have passed since compressor start-up or since the completion of defrost operation, forced defrost operation

will start by turning on the forced defrost switch (DIP SW2-7).

Even if the defrost prohibit timer is set to 90 minutes, the actual defrost prohibit time for the next operation will be 50 minutes

if defrosting took 12 minutes.

In the multiple-outdoor-unit system, all of the outdoor units that are in operation go into the defrost mode simultaneously. The

unit(s) that is stopped at the time defrost operation starts remains stopped.

(2) Defrost operation

(3) Stopping the defrost operation

The defrost cycle ends when 12 minutes have passed since the beginning of the cycle, or when the pipe temperature (TH3),

in the following table, or above has been continuously detected for 4 minutes (when SW3-4 is set to OFF) or 2 minutes (when
SW3-4 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 SW3-4 is set to OFF OR

*1

=25°C+TH7°C [77°F+TH7°F] and SW3-4 is set to ON.

*1 5°C [41°F] 25°C [77°F]

In the multiple system, defrosting is stopped on all units at the same time.

(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.

Model

TH3

SW3 - 3 OFF SW3 - 3 ON

250 model - 10°C [14°F] - 5°C [23°F]

Compressor frequency Model Compressor frequency

250 model 65 Hz

Outdoor unit fan Stopped

SV1a ON

SV5b OFF (open)

21S4a OFF

21S4b OFF

SV9 OFF

LEV1 0 pulse

*1

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

LEV2 3000 pulses

Model

TH3

SW3 - 4 OFF SW3 - 4 ON

250 model 10°C [50°F] 5°C [41°F]

[ VII Control ]

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HWE1018A GB

-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.

-9- Capacity Control of Outdoor Fan

(1) Control method

Depending on the capacity required, the rotation speed of the outdoor unit fan is controlled by the inverter to keep a constant

condensing temperature during cooling operation and a constant evaporation temperature during heating operation.

(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.

-10- Subcool Coil Control (Linear Expansion Valve <LEV1>)

The OC and OS control 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). The LEV is closed (0) in the heating mode, while the compressor is
stopped, and during cooling Thermo-OFF. The LEV opens to a specified position when 15 minutes have passed after Thermo­OFF. (65 pulses)

During defrost, normally, the valve is initially set at 0 pulse, although it may operate at higher pulses depending on the 63 LS

and TH4 status.

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

Initial opening of LEV

Start

Finish

30 seconds

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HWE1018A GB

-11- Refrigerant flow control (Linear expansion valve <LEV2>)

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

OC and OS 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.

-12- Control at Initial Start-up

When started up for the first time before 12 hours have elapsed after power on, the unit goes into the initial startup mode.

1. Flowchart of initial operation

Single outdoor unit system (P250 model)

Multiple outdoor unit system (P500 model)

50 F 60Hz

F < 50Hz

Initial startup mode starts.

Completed in the integrated operation time of 30 minutes.

Initial startup mode complete

Completed in the integrated operation time of 90 minutes.

Yes

No

50 F 60Hz (both OC and OS)

F < 50Hz (both OC and OS)

Completed in the integrated operation time of 30 minutes.

Completed in the integrated operation time of 90 minutes.

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

50 F 60Hz (OC)

F < 50Hz (OC)

Completed in the integrated operation time of 30 minutes.

Completed in the integrated operation time of 90 minutes.

The compressor on the OC starts up.

Both the OC and OS stop.

The startup sequence of the OC and OS is rotated.

50 F 60Hz (OS)

F < 50Hz (OS)

Completed in the integrated operation time of 30 minutes.

Completed in the integrated operation time of 90 minutes.

The compressor on the OS starts up.

Initial startup mode complete

The compressor on the OC starts up.

The air conditioning load is large

enough to require a simultaneous

operation of OC and OS.

Initial startup mode starts.

F 60Hz

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HWE1018A GB

-13- Emergency Operation Mode

Backup mode is a mode in which the unit is operated when the thermistor malfunctions. The unit automatically goes into the
backup mode when the following error is detected.

(1) Starting the emergency operation

1) When an error occurs, the error source and the error code will be displayed on the display on the remote controller.

2) Only the outdoor units that has not detected any errors will stay in operation.

3) If a TH2, TH3, TH5, or TH6 fault is detected, the sensor reading is complemented, and the unit will stay in operation.

4) If another thermistor fault is detected during the above-mentioned operation, the unit will make an abnormal stop.

Error codes that permit an emergency operation (Applicable to both OC and OS)

(2) Ending the emergency operation

1) End conditions
When one of the following conditions is met, emergency operation will end.

When an error is reset

*When resetting an error with the remote controller or the external input

When an error is detected that does not allow the unit to run the emergency operation.

(3) Miscellaneous

1) End conditions

When encountering problems other than the ones listed above, the system makes an error stop without performing emergen-

cy operation. (Only the indoor fan operates unless problems are found with the fan.)

When problems are found in only one of the two units of a 2-refrigerant circuit, only the unit with the problems will run an

emergency operation or stop its operation, and the other unit will keep running its operation.

Emergency operation is intended only as a first aid until the unit is serviced. Have the unit serviced without delay to restore a

normal operation.

Trouble source

Error codes that permit an
emergency operation

Error code description

Serial communication error
Bus voltage drop
Heatsink overheat protection
Overload protection
Overcurrent relay trip
Heatsink temperature sensor failure (THHS)
Current sensor/circuit failure
Subcool heat exchanger bypass outlet temperature sensor failure
Pipe temperature sensor failure
Discharge temperature sensor failure
Accumulator inlet temperature sensor failure
Subcool heat exchanger liquid outlet sensor failure
Outside air temperature sensor failure

Open phase

Power supply sync signal abnormality

0403
4220, 4225
4230
4240
4250, 4255
5110
5301
5102
5103
5104
5105
5106
5107

4102

4115

Compressor
Fan motor
Inverter

Thermistor

Power

TH2
TH3
TH4
TH5
TH6
TH7

[ VII Control ]

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HWE1018A GB

-14- Capacity Control between Outdoor Units (when two refrigerant circuits are connected)

The following two capacity control methods between indoor units are available.

Control to make only one of the outdoor units (which has the smaller address) operate and keep running during low-load hours

at startup.

Control to make one of the outdoor units stop, and the other outdoor unit operate when the load becomes low during normal

operation. After a certain period of time has passed since only one of the outdoor units started operation, the unit in operation
stops, and the other outdoor unit starts operation automatically.

(1) Starting Conditions

Air conditioning load that is calculated based on the return air temperature is 50% or above.
Operation frequencies of both indoor and outdoor units remain near the minimum level three minutes after start-up.

(2) Stopping Conditions

When operation frequency of the running unit rises up near the maximum capacity.
When it is determined that the load is over 50%, using suction temperature as a reference.
When compressor stops while running only one unit.

-15- Dehumidification priority control

The dehumidification priority control is the control to increase the amount of dehumidification by increasing the frequency of
the compressor when the external signal (dehumidification command) is received during cooling operation.
During dehumidification priority control, the room temperature may drop below the preset temperature set during normal op­eration.
Under this control, the set temperature wil be compulsory at the minimum value.
(Under discharge temperature control:14°C[57°F] Under suction temperature conrol:19°C[66°F])
The temperature nor the humidity can be controlled simultaneously as the reheat function is not available.

-16- Operation Mode

(1) Indoor unit operation mode

The operation mode can be selected from the following 4 modes using the remote controller.

(2) Outdoor unit operation mode

The heating mode can be used for standby of the indoor unit when the outdoor temperature is low. Confirm that the devices
to be cooled are not influenced by the heat.
The discharge temperature control cannot be used.
The discharge temperature is controlled not to drop less or equal 30°C[86°F]. It may take time to reach the indoor target tem­perature.
When the indoor temperature reaches the cooling operation range, switch the operation from heating to cooling.

1 Cooling mode

2 Heating mode

3Fan mode

4 Stopping mode

1 Cooling mode All indoor units in operation are in cooling mode.

2 Heating mode All indoor units in operation are in heating mode.

3 Stopping mode All indoor units are in fan mode or stopping mode.

[ VII Control ]

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HWE1018A GB

-17- DEMAND Control

Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the indoor units.

When DIP SW4-4 is set to ON, the 4-step DEMAND control is enabled.
Eight-step demand control is possible in the system with two outdoor units.

Refer to Chapter II [3] 2. (7) "Various types of control using input-output signal connector on the outdoor unit (various connec­tion options)" for details.(page 21)

[ VII Control ]

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HWE1018A GB

-18- System Rotation Control Instructions

1. General Descriptions

Each group can consist of a maximum of 5 systems and a minimum of 2 systems.
With the use of this control function, one system in a given group serves as a backup and remains stopped.
The unit designated as the control unit (System 1 in Figure 1) sends command signals to other units in the group to start or

stop, and rotates the backup unit every 480 hours.

Rotation sequence is in the ascending order of address, starting from the lowest address after the control unit address.

(e.g., System 2 -> System 3 -> System 4 -> System 5 -> System 1 in Figure 1 below)

If other units in the group detect an error or if there is a communication failure between the systems, this control is terminated,

and the backup unit goes into operation.

CAUTION

To enable this control function, the following wiring and settings are required at installation.

1) Daisy-chain terminals M1 and M2 on the terminal block for transmission line for centralized control (TB7) on all
applicable outdoor units.
Move the power jumper connected to CN41 to CN40 on only one of the outdoor units.
To supply power to the outdoor unit from a power supply unit, leave the power jumper connected to CN41as it
is (factory setting).

2) Check that the label on the indoor unit circuit board reads KE90D352, if it does not, replace the circuit board.

3) Set the SW1-9 and SW1-10 on indoor units as follows to enable the external input: (SW1-9: ON; SW1-10: OFF).

4) Assign sequential addresses to the units as shown below (Figure 1 and 2).
(Only use odd numbers for the 10HP system.)

5) Make the rotation group settings by setting the appropriate switches on the outdoor units.
<Refer to Item 2 below.>

OC51

IC01

MA

Figure 1 Sample 20HP system group

OC52

IC02

OC53

IC03

MA

System 2

Backup unit

OC54

IC04

OC55

IC05

MA

System 3

OC56

IC06

OC57

IC07

MA

System 4

OC58

IC08

OC59

IC09

MA

System 5

OC60

IC10

Backup unit

OC51

IC01

MA

System 1

(Control unit)

System 1

(Control unit)

OC53

IC03

MA

System 2

OC55

IC05

MA

System 3

OC57

IC07

MA

System 4

OC59

IC09

MA

System 5

Figure 2 Sample 10HP system group

TB7

TB3
TB5

TB15

TB7

TB3
TB5

TB15

TB7

TB3
TB5

TB15

TB7

TB3
TB5

TB15