HWE07040 SH PUH 8 10YKA 2007

TECHNICAL & SERVICE MANUAL

[Model names]

PUH-8YKA
PUH-10YKA

No.HWE07040

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CONTENTS

1. COMBINATION OF INDOOR AND OUTDOOR UNITS ···2

2. SAFETY FOR USE ·········································3

3. SAFETY PRECAUTIONS ·······························5

4. DATA ·······························································7

5. SOUND DATA ·················································8

6. OUTLINES AND DIMENSIONS ······················9

7. WIRING DIAGRAM ·······································10

8. REFRIGERANT SYSTEM DIAGRAM ···········11

9. SYSTEM CONTROL ·····································12

10. TEST RUN ·····················································14

11. CONTROL ·····················································16

12. GROUP CONTROL ·······································29

13. NOTES FOR M-NET <MELANS> WIRING CONNECTION ····30

14. EMERGENCY OPERATION··························32

15. SELF-DIAGNOSIS AND TROUBLESHOOTING ···34

16. SIMPLE PARTS CHECK METHOD ··············45

17. PARTS NAME ···············································46

18. OPTIONAL PARTS ·······································48

July 2007

COMBINATION OF INDOOR AND OUTDOOR UNITS

Model name

Service manual No.

PUH-8YKA

PEH-8GA

PEH-16GA

HWE07030

PUH-10YKA

PEH-10GA
PEH-20GA

HWE07030

Indoor unit

Outdoor unit

Standard

Salt-resistant

PUH-8YKA

PUH-8YKA.TH

PUH-10YKA.TH

PUH-8YKA.TH-BS

PUH-10YKA

PUH-10YKA.TH-BS

Model name

Specification

Types of connected indoor units

Outdoor Unit List

SAFETY FOR USE

Before conducting installation work, please read this ''SAFETY FOR USE'' carefully

for

correct installation.

Since the caution items shown here contain important description relative to safety, please

observe them without fail.

After reading, please keep it with you together the Instruction Manual, and read it again at the

movement of the unit.

The unit should not be installed by the user.
If the unit is installed improperly, explosion, water
leakage, electric shock or fire may be result.
Consult your dealer or specialist subcontractor for
repair and movement.

For installation, conduct the work correctly by
following the Installation Manual.
Improper installation may cause a fire, electrical shock
or water leakage.

Install the unit on a spot sufficiently durable against
the unit weight.
Insufficient durability can cause an injury by the falling
down of unit.

All electric work must be performed by licensed
technician, according to local regulations and the
instructions given in this manual.
The units should be powered by dedicated power lines.
Power lines with insufficient capacity or improper
electrical work may result in electric shock or fire.

Use only the specified cables for wiring. The
connections must be made secured without
tension the terminals.
Improper connection or fastening can cause a fire or
electrical shock.

The unit should be installed according to the
instructions in order to minimize the risk of damage
from earthquakes, typhoons or strong winds.
Improper installation work can cause an injury by the
falling down of the unit.

The outdoor unit must be installed on stable, level
surface, in a place where there is no accumulation
of snow , leaves or rubbish.

The outdoor unit should be installed in a location
where air and noise emitted by the unit will not
disturb the neighbors. The indoor unit should be
securely installed.

When installing or relocating the unit, make sure that
no substance other than the specified refrigerant
enters the refrigerant circuit.
Any presence of foreign substance such as air can
cause abnormal pressure rise or explosion.

If the unit is loosely mounted, it may fall, and cause injury.

Never repair the unit, remodel or transfer it to
another site by yourself.
If they are performed improperly, water leakage, electric
shock or fire may result. If you need to have the unit
repaired or moved, consult your dealer.

Use only the specified refrigerant (R-22) to charge
the refrigerant circuit.
Do not mix it with any other refrigerant and do not
allow air to remain in the circuit.

Air enclosed in the circuit can cause high pressure resulting

in a rupture and other hazards.

Ventilate the room if refrigerant leaks during
Installation.
The refrigerant heated generates poisonous gas by
decomposition which can cause poisoning.

After completing installation work, make sure that
refrigerant gas has not leaked.
If refrigerant gas has leaked and exposed to fan heater,
stove, oven and so on, it may generate noxious gases.

Take a proper measure to suppress the critical
concentration of refrigerant if leaked when
installing the unit in a small room.
The limit density is made not to be exceeded even if the
refrigerant leaks by any chance.
You are necessary to ventilation measures to prevent
the accident. If the refrigerant leaks, hypoxia accident
may caused.
For the countermeasure to be taken, consult your
dealer.

The terminal block cover of unit must be firmly
attached to prevent entry of dust and moisture.
Improper mounting of the cover cause electric shock or
fire.

Use only optional parts authorised by Mitsubishi
Electric.
If the accessories are installed improperly, water
leakage, electric shock or fire may result.

Ask your dealer or an authorised company to install
them.

Erroneous handling gives a high possibility to induce serious results such as

death or heavy injury.

Erroneous handling may induce serious injury depending on the situation.

Warning

Caution

Never install on the place where a combustible gas
might leak.
The gas may ignite or explode when the gas leaks and
collects in surrounding of the unit.
When the unit is installed at telecommunication
centers or hospitals, take a proper provision
against noise.
The erroneous operation of air conditioner may be
induced by inverter equipment, independent power
device, medical equipment or communication
equipment.
While the erroneous operation of medical equipment or
communication equipment may caused by the air
conditioner.
For special use as for foods, animals/plants,
precision equipment or art objects, the applicability
should be confirmed beforehand.
As the use for the applications other than that
designed originally may result in the deterioration of the
quality. Consult your dealer in this regard.
Do not use the unit under a special atmosphere.
Installing the unit at the following places may cause a
trouble, a place where much machine oil, salt sonnet,
humidity or dust, spa district, a place full of sulfur gas,
volatile gas, or corrosive gas, a place near high
frequency processing machine.
Thermal insulation of the drain pipes is necessary
prevent dew condensation.
If the drain pipes are not properly insulated,
condensation will result and drip on ceiling, floor or other
possessions.
The drain piping must process by surely,and insulate
the drain piping not to be dewy.
When the room humidity exceeds 80% or when the
drain pipe is clogged, water may drip from the indoor
unit. The outdoor unit produces condensation during the
heating operation.
Make sure to provide drainage around the outdoor unit if
such condensation is likely to cause damage.
Install drain piping according to this Installation
Manual to ensure proper drainage.
Place thermal insulation on the pipes to prevent
condensation.
Improper drain piping may cause water leakage and
damage to furniture or other possessions.
The unit must be properly earth connected.
Do not connect the earth wire to gas pipe, city water
pipe, lightning rod or telephone earth wire.
Improper earth connection may cause electrical shock.
When installing at a watery place, provide an
electric leak breaker.
Failure to mount the electric leak breaker may cause
electrical shock.

Make sure that there is a main power switch.

Use breaker or fuse with proper capacity.

Using a wire or a copper wire instead of proper capacity
of fuse can cause fire or trouble.
Other appliances connected to the same line could cause
an overload.
For the power lines, use standard cables of
sufficient current capacity.
Otherwise, current leakage, overheating or fire may
occur.
When installing the power lines, do not apply
tension to the cables.
The tighten or loosen the connections may cause generate
heat and cause fire.

Arrange the configuration of wiring not to bring up
the panel and terminal cover, and fasten the panel
and terminal cover securely.
The poor mounting of the panel or terminal cover may
cause the heat generation of the terminal connection,
a fire or electrical shock.
Do not wash the unit with water.
If washed with water, electrical shock may be caused.

Do not handle the switch with wet hands.
Otherwise electrical shock can be resulted.

Be very careful on handling the unit.
When carrying in outdoor unit, be sure to support it at
four points.
Carrying in and lifting with 3-point support may make
outdoor unit unstable, resulting in a fall of it.
The unit should not be carried by only one person if it is
more than 20kg.
Some units use PP bands for packing.
Do not use any PP band for delivery purpose.
Do not touch the heat exchanger fins with your bear
hands.
Doing so may cut your hands.
Be sure to safely dispose the packaging materials.
Packaging materials, such as catches and other metal
or wooden parts, may cause stabs or other injuries.
Tear off and discard plastic packing bags so that
children will not play any of them.
If children play with a plastic bag which was not torn off,
it may cause a risk of suffocation.

Do not leave the mounting base being damaged.
The damaged base may cause the falling down of
the unit which may give injury.

Turn on the main power switch more than 6 hours
before starting operation.
Do not turn the main power switch OFF during seasons
of heavy use, doing so can result in failure.

Do not touch the compressor or refrigerant piping
without wearing glove on your hands.
Touching directly such part can cause a burn or
frostbite as it becomes high or low temperature
according to the refrigerant state.
Do not touch the metal edges inside the unit
without wearing glove on your hands.
Touching directly it may injure your hands.
Do not remove the panel or the fan guard from
the outdoor unit when it is running.

You could be injured if you touch rotating, hot or high-
voltage parts.

Do not operate the air conditioner without the air
filter set place.
Dust may accumulate, and cause a failure.

At emergency (if you smell something burning), stop
operation and turn the power source switch off.
Continuing the operation without eliminating the
emergency state may cause a machine trouble, fire, or
electrical shock.
After stopping operation, be sure to wait for five
minutes before turning off the main power switch.
Otherwise, water leakage or unit failure may occur.

Remote controller is not pushed with the thing
sharpening ahead.
It occasionally causes the electric shock and the
breakdown.

Remote controller is not installed for the place
where direct sunshine strikes.

Caution

SAFETY PRECAUTIONS

3-1.

Before installing the unit, make sure you read all the “Safety
precautions”.

The “Safety precautions” provide very important points re-
garding safety. Make sure you follow them.

Symbols used in the text

Warning:

Describes precautions that should be observed to prevent danger of injury
or death to the user.

Caution:

Describes precautions that should be observed to prevent damage to the
unit.

Symbols used in the illustrations

: Indicates an action that must be avoided.

: Indicates that important instructions must be followed.

: Indicates a part which must be grounded.

: Beware of electric shock. <Color: yellow>

Warning:

Carefully read the labels affixed to the unit.

Warning:

•

Ask the dealer or an authorized technician to install the air conditioner.
- Improper installation by the user may result in water leakage, electric shock,

or fire.

•

Install the unit at a place that can withstand its weight.
- Inadequate strength may cause the unit to fall down, resulting in injuries.

•

Use the specified cables for wiring. Make the connections securely so
that the outside force of the cable is not applied to the terminals.
- Inadequate connection and fastening may generate heat and cause a fire.

•

Prepare for strong winds and earthquakes and install the unit at the speci-
fied place.
- Improper installation may cause the unit to topple and result in injury.

•

Always use an filter and other accessories specified by Mitsubishi Elec-
tric.
- Ask an authorized technician to install the accessories. Improper installation

by the user may result in water leakage, electric shock, or fire.

•

Never repair the unit. If the air conditioner must be repaired, consult the
dealer.
- If the unit is repaired improperly, water leakage, electric shock, or fire may

result.

•

Do not touch the heat exchanger fins and metal edges.
- Improper handling may result in injury.

•

If refrigerant gas leaks during installation work, ventilate the room.
- If the refrigerant gas comes into contact with a flame, poisonous gases will

be released.

•

Install the air conditioner according to this Installation Manual.
- If the unit is installed improperly, water leakage, electric shock, or fire may

result.

•

Have all electric work done by a licensed electrician according to “Elec-
tric Facility Engineering Standard” and “Interior Wire Regulations”and
the instructions given in this manual and always use a special circuit.
- If the power source capacity is inadequate or electric work is performed im-

properly, electric shock and fire may result.

•

Securely install the terminal cover (panel).
- If the terminal cover (panel) is not installed properly, dust or water may enter

the outdoor unit and fire or electric shock may result.

•

When installing and moving the air conditioner to another site, do not
charge the it with a refrigerant different from the refrigerant (R22) speci-
fied on the unit.
- If a different refrigerant or air is mixed with the original refrigerant, the refrig-

erant cycle may malfunction and the unit may be damaged.

•

If the air conditioner is installed in a small room, measures must be taken
to prevent the refrigerant concentration from exceeding the safety limit
even if the refrigerant should leak.
- Consult the dealer regarding the appropriate measures to prevent the safety

limit from being exceeded. Should the refrigerant leak and cause the safety
limit to be exceeded, hazards due to lack of oxygen in the room could result.

•

When moving and reinstalling the air conditioner, consult the dealer or
an authorized technician.
- If the air conditioner is installed improperly, water leakage, electric shock, or

fire may result.

•

After completing installation work, make sure that refrigerant gas is not
leaking.
- If the refrigerant gas leaks and is exposed to a fan heater, stove, oven, or

other heat source, it may generate noxious gases.

•

Do not reconstruct or change the settings of the protection devices.
- If the pressure switch, thermal switch, or other protection device is shorted

and operated forcibly, or parts other than those specified by Mitsubishi Elec-
tric are used, fire or explosion may result.

•

To dispose of this product, consult your dealer.

•

The installer and system specialist shall secure safety against leakage
according to local regulation or standards.
- Following standards may be applicable if local regulation are not available.

•

Pay a special attention to the place, such as a basement, etc. where re-
frigeration gas can stay, since refrigeration is heavier than the air.

•

The appliance is not intended for use by young children or infirm per-
sons without supervision.

•

Young children should be supervised to ensure that they do not play
with the appliance.

•

Never operate in open phase condition.
Control box may be broken.

3-2. BEFORE INSTALLATION

Caution:

•

Do not install the unit where combustible gas may leak.
- If the gas leaks and accumulates around the unit, an explosion may result.

•

Do not use the air conditioner where food, pets, plants, precision instru-
ments, or artwork are kept.
- The quality of the food, etc. may deteriorate.

•

Do not use the air conditioner in special environments.
- Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of

the air conditioner or damage its parts.

•

When installing the unit in a hospital, communication station, or similar
place, provide sufficient protection against noise.
- The inverter equipment, private power generator, high-frequency medical

equipment, or radio communication equipment may cause the air conditioner
to operate erroneously, or fail to operate. On the other hand, the air condi-
tioner may affect such equipment by creating noise that disturbs medical
treatment or image broadcasting.

•

Do not install the unit on a structure that may cause leakage.
- When the room humidity exceeds 80 % or when the drain pipe is clogged,

condensation may drip from the indoor unit. Perform collective drainage work
together with the outdoor unit, as required.

3-3.

Caution:

•

Ground the unit.
- Do not connect the ground wire to gas or water pipes, lightning rods, or

telephone ground lines. Improper grounding may result in electric shock.

•

The reverse phase of L lines (L

, L

) can be detected (Error cord: 4103),

but the reverse phase of L lines and N line can be not be detected.
- Some electric parts should be damaged when power is supplied under the

miss wiring.

•

Install the power cable so that tension is not applied to the cable.
- Tension may cause the cable to break and generate heat and cause a fire.

•

Install an leak circuit breaker, as required.
- If an leak circuit breaker is not installed, electric shock may result.

•

Use power line cables of sufficient current carrying capacity and rating.
- Cables that are too small may leak, generate heat, and cause a fire.

•

Use only a circuit breaker and fuse of the specified capacity.
- A fuse or circuit breaker of a larger capacity or a steel or copper wire may

result in a general unit failure or fire.

•

Do not wash the air conditioner units.
- Washing them may cause an electric shock.

•

Be careful that the installation base is not damaged by long use.
- If the damage is left uncorrected, the unit may fall and cause personal injury

or property damage.

•

Install the drain piping according to this Installation Manual to ensure
proper drainage. Wrap thermal insulation around the pipes to prevent
condensation.
- Improper drain piping may cause water leakage and damage to furniture

and other possessions.

•

Be very careful about product transportation.
- Only one person should not carry the product if it weighs more than 20 kg.
- Some products use PP bands for packaging. Do not use any PP bands for a

means of transportation. It is dangerous.

- Do not touch the heat exchanger fins. Doing so may cut your fingers.
- When transporting the outdoor unit, suspend it at the specified positions on

the unit base. Also support the outdoor unit at four points so that it cannot
slip sideways.

•

Safely dispose of the packing materials.
- Packing materials, such as nails and other metal or wooden parts, may cause

stabs or other injuries.

- Tear apart and throw away plastic packaging bags so that children will not

play with them. If children play with a plastic bag which was not torn apart,
they face the risk of suffocation.

BEFORE INSTALLATION AND ELECTRIC WORK

BEFORE INSTALLATION (MOVED) -
ELECTRICAL WORK

•

Remote controller is not allowed to install for the place where direct
sunshine strikes.

3-4. BEFORE STARTING THE TEST RUN

Caution:

•

Turn on the power at least 12 hours before starting operation.
- Starting operation immediately after turning on the main power switch can

result in severe damage to internal parts. Keep the power switch turned on
during the operational season.

•

Do not touch the switches with wet fingers.
- Touching a switch with wet fingers can cause electric shock.

•

Do not touch the refrigerant pipes during and immediately after opera-
tion.
- During and immediately after operation, the refrigerant pipes are may be

hot and may be cold, depending on the condition of the refrigerant flowing
through the refrigerant piping, compressor, and other refrigerant cycle parts.
Your hands may suffer burns or frostbite if you touch the refrigerant pipes.

•

Do not operate the air conditioner with the panels and guards removed.
- Rotating, hot, or high-voltage parts can cause injuries.

•

Do not turn off the power immediately after stopping operation.
- Always wait at least five minutes before turning off the power. Otherwise,

water leakage and trouble may occur.

•

Do not operate the air conditioner without the air filter set place.
- Dust may accumulate, and cause a failure.

•

At emergency (if you smell something burning), stop operation and turn
the power source switch off.
- Continuing the operation without eliminating the emergency state may cause

a machine trouble, fire, or electric shock.

•

Remote controller should be pushed with finger.
- It occasionally causes the electric shock and the breakdown.

DATA

4-1. REFILLING REFRIGERANT CHARGE (R-22 : kg)

4-2. COMPRESSOR TECHNICAL DATA

at 20˚C

7.5m

10m

15m

20m

25m

30m

35m

40m

45m

50m

PUH-8

0.0

0.3

0.9

1.5

2.1

2.6

3.2

3.8

4.4

5.0

PUH-10

0.0

0.3

0.9

1.5

2.1

2.6

3.2

3.8

4.4

5.0

Model

Piping length (one way) Additional refriferant charge (R22)

PUH-8

PUH-10

ZR-94KC-TFD-501

ZR-125KC-TFD-501

T1-T2

1.59

1.23

T2-T3

1.59

1.23

T3-T1

1.59

1.23

Compressor Model

Outdoor Unit

Widing

Resistance

(

)

Note:
If there is an insufficient amount of refrigerant in the system, the unit will behave in one of the following ways: 1) the discharge temperature of the unit rises abnor-
mally high, which is detected as an error, and the unit comes to a stop; 2) the discharge temperature of the compressor rises abnormally high, the unit goes into
the unload operation, which appears as the P8 error on the display, and the unit comes to a stop; or 3) the built-in thermostat on the compressor goes off and
stops the compressor. In either case, replenish and adjust the refrigerant. Once the unit goes into the unload operation, it takes at least 3 hours until normal opera-
tion can be restored.

SOUND DATA

5-1. OUTDOOR UNITS

(2) Position measurement

SPL

dB(A)

63Hz

125Hz

250Hz

500Hz

1000Hz

2000Hz

4000Hz

8000Hz

OCTAVE BAND FREQ.Hz

Model

(1) Sound Levels

PUH-8

YKA

Cool

Heat

Cool

Heat

PUH-10

YKA

Measurement
point

0.75m

PUH-8,10YKA

OUTLINES AND DIMENSIONS

PUH-8YKA, PUH-10YKA

Unit : mm

Accessory

Conduit mouting plate

(Painted the same color as the unit body)

27 1pc.

34 1pc.

Tapping screw 4X12

Connection pipe

Packing.

Note 1.It is possible to change to

selecting the conduit mounting plate a,b.

4-10X20 Holes

Refrigerant pipe

PU-8YAKD

PUH-8YKA

25.4 (1 flange)

PU-10,12YAKD

PUH-10YKA

Knock out hole Pressure gauge (For option)

Refrigerant pipe

15.88(5/8 flare)

For the indoor unit connection wiring

27 Hole

Note 1

For the power supply wiring

40 Hole

For mounting

anchor bolt M8 [Field supply]

Air outlet

Air

inlet

Air inlet

Top view

Right side view

Front view

Left side view

Connection pipe (Accessory)

28.6 (1-1/8 flange)

27 or

34 by

4pcs.

1pc.

1pc

615

547

585

1480

1047

108.5

830

108.5

152

115

100

WIRING DIAGRAM

PUH-8YKA, PUH-10YKA

OUTDOOR UNIT

AUXILIARY RELAY

TRANSFORMER

FAN MOTOR (OUTDOOR)

MF2,MF3

Caution,

1.To protect compressor from abnormal current,

over current relays is installed. Therefore, do not

change factory set value of over current relays.

Note:1.The dotted lines show field wiring.

2.Color of earth wire is yellow and green twisting.

3.Specification subject to change without notice.

4.This motor(*1) includes auto reset type internal thermostat.

5.Indoor and outdoor connecting wires (*2) are made with polarities, make

sure matching wiring and terminal.

6. mark is connector. mark is terminal.

SYMBOL

NAME

F1,F2

FUSE (15A 250VAC CLASS T)

51C

52C

63L

63H1

63H2

COMPRESSOR MOTOR

LIQUID PIPE TEMP

OVER CURRENT RELAY (COMPRESSOR)

21S4

SV1

TB1,3,8

TH1

TH2

MAGNETIC CONTACTOR (COMPRESSOR)

PRESSURE SWITCH (LOW PRESSURE)

4-WAY VALVE

SOLENOID VALVE

CRANK CASE HEATER (COMPRESSOR)

TERMINAL BLOCK

PRESSURE SWITCH (HIGH PRESSURE)

PRESSURE SWITCH (FOR CONTROL)

THERMISTOR

DISCHARGE TEMP

C11

C12

C21

C22

POWER SUPPLY 3N~PE 380/400/415V 50HZ

MF2

CIRCUIT BREAKER

PUH-8,10YKA : 50A

(FIELD SUPPLY)

CONNECTOR (THERMISTOR FOR COND/EVA TEMP)

CN4

SECONDARY

PRIMARY

CONNECTOR (EXTERNAL I/O)

CN51

CONNECTOR (NIGHT MODE/SNOW SENSOR)

CN3N

CONNECTOR (OPARATION)

CN3D

CONNECTOR (LEV)

CN40

CONNECTOR (CONNECT TO OPTIONAL M-NET ADAPTER BOARD)

CNMNT

CONNECTOR (CONNECT TO OPTIONAL M-NET ADAPTER BOARD)

CNVMNT

F01-F04

FUSE (6.3A 250VAC CLASS F)

X01-X05

LED1

SW1-5

SWITCH

AUXILIARY RELAY

LED (FOR SERVICE)

OUTDOOR

MAIN BOARD

SV1

63H1

63L

21S4

F10

F20

F30

CNOUT1

CNOUT2

CNIN

CNFC2

CNFAN

51C

52C

CNPOW

F.C.

BOARD

N.F. BOARD

F03

5 6

TH2

CN51

CN28

CNS3

CNFG

63H2

CN20

CN53

CNMNT

CN2

CN3

CN40

CN3N

CN24

CN3S

CNVMNT

CN3D

CN34

DC power supply

Transmission

MAIN BOARD

Circuit

F02

F04

CNFC1

CN23

CN22

CN21

CN26

CN25

X04

X03

SW2

SW1

SW4

SW3

SW5

X01

X02

X05

CN52

52C

TH1

F01

51C

OUT

Blue

Black

White
Red

Black
White

Red

Green/Yellow

TO INDOOR UNIT

CONNECTING WIRES (*2)

(POLER)

N.F.BOARD

F10-F30

FUSE (6.3A 250VAC CLASS F)

OFF

123

OFF

123

OFF

123

OFF

INDOOR UNIT

OUTDOOR UNIT CONTROL BOX

(*1)

TB8

TB3

TB1

135

REFRIGERANT SYSTEM DIAGRAM

PEH-8: O.D. 4.0

I.D. 3.0-L1000

PEH-10: O.D. 4.0

I.D. 3.0-L700

PUH-8:

O.D. 6.0

I.D. 4.0-L14

PUH-10:

O.D. 6.0

I.D. 4.6-L15

Outdoor heat exchanger

Thermistor

TH1

(liquid temp)

Thermistor TH2 (discharge temp)

Low pressure

switch

(with heat insulator)

15.88mm

Refrigerant pipe

8HP:

25.4

10HP:

28.6mm

(with heat insulator)

Ball valve

Service port

4-wau value

Service port

High pressure switch (protection)

High pressure

switch (control)

Service port

Strainer

Capillary

tube

Capillary tube

O.D. 6.0

I.D. 4.0-L800

Capillary tube

O.D. 6.0

I.D. 4.0-L700

Compressor

Accumulator

Solenoid valve

Strainer

Indoor

heat

exchanger

Restrictor

valve

Distributor

Thermistor

TH2

Thermistor

TH5

Capillary

tube

Flared connection

Brazing connection

Flange connection

Restrictor

valve

Refrigerant flow in cooling

R.V.coil

Heating:ON

Cooling:OFF

Refrigerant flow in heating

PUH-8YKA PUH-10YKA

SYSTEM CONTROL

9-1. OUTDOOR UNIT ADDRESS SETTINGS

9-2. EXAMPLES OF REFRIGERANT SYSTEM ADDRESS SETTING

9-3. CAPACITY CONTROL SETTING METHOD (PEH-16, 20 ONLY)

9-4. GROUPING BY USING LCD REMOTE CONTROLLER

•

When controlling a group, the address must be set for each outdoor unit.

During address setting, set all the dip switches SW1 (3 - 6) on the board to
<when shipped from factory: all OFF>. (Address setting is not necessary for
1:1 or Free multi-component systems.)

•

Settings using SW1 are given below.

Please set the mutually different address, and prevent the start up simultane-
ously. (In case of connecting with PEH-16, 20)

SW1 function

itching

2 Error history clear

Operation by switch manipulation

Clear

Outdoor unit address

Settings 0 - 15

OFF

(SW1)

Ordinary

Model

–

3 Refrigerant system

address setting

↑

–

Set the refrigerant system address of one outdoor unit to 00 for the power supply
to the remote controller.
(The refrigerant system address is set to 00 when shipped from the factory.)
Do not duplicate the refrigerant system address settings within the same system.

With the PEH-16, 20 which has two outdoor units, the capacity can be controlled to
0%, 50% or 100%.
This is set by setting the outdoor unit side dip switches as shown in the table below
before turning the power on.

Ex.

Indoor unit

PEH-8, 10

PEH-16, 20

Outdoor unit

–

No.1

No.2

Outdoor unit refrigerant

system address

01~15

Remote controller

power supply unit

DipSW5-1

No.1 side outdoor unit

OFF

No.2 side outdoor unit

OFF

Combination of indoor/outdoor unit can be controlled up to a maximum of 16 refrig-
erant systems.

Indoor unit

Outdoor unit

Main remote controller

Subordinate remote controller

Standard (Refrigerant address = 00)

Refrigerant address = 01

Refrigerant address = 02

Refrigerant address = 03

Refrigerant address = 14

Refrigerant address = 15

* In case of PEH-8, 10

* In case of PEH-16, 20

No.1

No.2

No.1

No.2

No.1

E F

G H

I J

No.2

Wiring from the Remote Control

This wire is connected to TB5 (terminal board for remote controller) of the indoor unit (non-polar).

When a Different Refrigerant System Grouping is Used

Up to 16 refrigerant systems can be controlled as one group using the LCD remote

Notes:
1. In single refrigerant system, there is no need of wiring

2. LCD remote controller can be installed up to a maximum of 2 units for one group.

controller.

Power supply

Earth leakage breaker

Circuit breaker or local switch

Remote controller

Indoor unit

Outdoor unit (Address)

Grouping (16 outdoor units) [Connecting with PEH-16, 20]

Grouping (16 outdoor units) [Example: PEH-8, 10]

PUH-8, 10

(00)

PUH-8, 10

(14)

PUH-8, 10

(15)

L1 L2 L3 N

PEH-8, 10

L1 L2 L3 N S1 S2 S3

S1 S2 S3 S1 S2 S3

L1 L2 L3 N

S1 S2 S3 S1 S2 S3

L1 L2 L3 N

OUT OUT IN IN

PUH-8, 10

(00)

PUH-8, 10

(01)

PEH-16, 20

PUH-8, 10

(14)

PUH-8, 10

(15)

PEH-16, 20

B C

A B C

(TB4-1) (TB4-2)

TEST RUN

10-1. OUTDOOR UNIT

(1) Test run

The test run can be carried out from the outdoor unit.

1. Checklist

•

After the installation, piping setup, and wiring of the indoor and outdoor units is
complete, check that refrigerant is not leaking, the power and control wires are
not loose, and the poles are not reversed.

•

Use a 500 V insulation resistance tester to make sure that the resistance be-
tween the power terminal and the ground is 1.0 M

Ω

or more. If it is less than

1.0 M

Ω

, do not operate the unit. * Absolutely do not touch the tester to indoor/

outdoor connection terminals S1, S2, and S3. An accident could occur.

•

Make sure there is no malfunction in the outdoor unit. (If there is a malfunction,
you can diagnose it using LED1 on the board.)

•

Check that the ball valve is fully open on both the liquid and gas ends.

•

Check to make sure that L

, L

, and L

are connected in the correct phase

order. Connecting them in the reverse order will trip the negative-phase pro-
tector, and the unit will come to a stop, displaying the Error code F1.

•

Starting at least 12 hours before the test run, send current through the
crankcase heater. (If the current is running for a shorter period of time,
damage to the compressor could result.)

After the above checks are complete, carry out the test run as indicated in the
following outline.

2. Starting and finishing the test run

•

Procedure from the outdoor unit: start and stop the test run and set test run
mode (cooling/heating) using the SW4 dip switches on the board.

Set test run mode (cooling/heating) using SW 4-2.

The test run will begin when SW 4-1 is turned ON, according to the mode
selected by SW 4-2.

The test run is stopped when SW 4-1 is turned OFF.

Note:
Test run mode cannot be stopped during operation by using SW 4-2. (If the
operation mode is to be changed, first stop it using SW 4-1, then after chang-
ing the operation mode, start the test run again using SW 4-1.)

•

If the 2-hour timer is set, the test run will stop automatically after 2 hours.

•

During the test run, the room temperature display on the indoor unit will indi-
cate the temperature of the indoor unit piping.

•

When you operate the test run from OC1, all trial runs are completed by OC1

→

IC1

→

IC1

→

OC2.

cooling

<SW4>

heating

1
2

stop

OFF

PEH-16, 20

(IC1)

OC1

OC2

Error code list:

(2) How to handle problems with the test run

details

Remote controller communication – reception error

Remote controller board error

Remote controller communication – transmission error

Remote controller communication – reception error

Remote controller communication – transmission error
Communication between indoor and outdoor units – reception error

Communication between indoor and outdoor units – transmission error

Communication between indoor and outdoor units – reception error

Communication between indoor and outdoor units – transmission error

Indoor/outdoor connection wiring error, indoor unit overload (5 units or more)

Indoor/outdoor connection wiring error (interference, loose)

Excessive time in use

Serial communication error

Reverse phase, out of phase verification

Faulty input circuit

Duplicated M-NET address setting

M-NET error in PH/W transmission

M-NET bus busy

M-NET communication error with P transmission

M-NET error – no ACK

M-NET error- no response

Undefined error code

Outlet temperature error

CN23 Short-circuit Connector Unplugged

Open/short in discharge temp thermistor

Open/short in liquid temp thermistor

Compressor overcurrent interruption (51C operation)

High pressure error (63H1 operation)

Low pressure error (63L operation)

Power synchronous idle circuit error

Inlet sensor error

Open/short in liquid temp thermistor

Drain sensor error

Drain overflow protector operation

Water leak error (PDH only)

Freeze prevention operation

Surge prevention operation

Piping temperature error

Open/short in condenser/evaporater temp thermistor

Error details

Problem location

Remote Controller

Indoor unit

Outdoor unit

M-NET board

Outdoor unit

M-NET board

–

Outdoor unit

Indoor unit

MELANS display

6831,6834

6201,6202

6832,6833

6831,6834

6832,6833
6740,6843

6841,6842

6840,6843

6841,6842

6844

6845

6846

0403

4103

4115

6600

6602

6603

6606

6607

6608

undefined

1102

1108

5104

4101

1302

1300

4115

5101

5102

2503

2502

2500

1503

1504

1110

5103

Remote controller

display

E1, E2

E4
E5

5105

SW2 setting

123456

000000

011110

010110

110110

011100

111100

Item

Operation mode/relay output

Outdoor unit control condition

Indoor unit control condition

(IC1)

(IC2)

Indoor unit control condition

(IC3)

(IC4)

Error code history 1

Error code history 2

Display contents

tens place

O: stop

C: cooling

H: heating

d: defrosting

units place

1: SV1

2: 21S4

4: 52C

When an error occurs, the error code

and error signal (*1) are displayed in

alternation.

Relay output = SV1 + 21S4 + 52C

Ex. During cooling mode, when 52C and SV1 are ON: C5

Control mode display system

The error code (ex. U8, UA) and error indicator (*1) are displayed in alternation.

Ordinary

Hot adjustment

Defrosting

—

Heater ON

Freeze prevention

Surge prevention

Compressor OFF

Display

←
←
←
←
←
←
←
←

Indoor unit

Control mode

Indoor unit No.1

Indoor unit No.3

Outdoor unit

Indoor unit No.2

Indoor unit No.4

Outdoor unit

*1 Display system for error indicator

The indicator corresponds to the following numbers

0 ............. Outdoor unit
1 ............. Indoor unit No.1
2 ............. Indoor unit No.2
3 ............. Indoor unit No.3
4 ............. Indoor unit No.4

•

Depending on the position of the SW2 switch on the outdoor unit board, the segments light up to indicate the running condition of the unit and the particulars of the check
code.

CONTROL

11-1. COMPOSITION OF CONTROL

(1) Function block diagram

3N~
380/400/415 V
50 Hz

outdoor

indoor

Remote

controller

Fuse

LED2

LED3

Fuse

DC5V for

microcomputer

DC/DC

converter

Fuse

Electr

ical

ter

minal b

loc

Remote controller

ter

inal b

loc

Remote controller

ter

minal b

loc

Semiconductor
relay

Over current
relay

Magnetic

contractor

4-way valve,
solenoid valve,
crankcase heater

Key input

LCD

Send/receive

Louver

Vane

Drain pump

Others

Communication

circuit

Communication

circuit

Transformer

Fan control

Compressor

Outdoor fan

Indoor fan

Indoor/outdoor

connection ter

minal

Indoor/outdoor

connection ter

minal

Current

detection

<Power>

LED1

DC5V

12V

11-2. CONTROL SPECIFICATIONS

Compressor internal
thermostat

Intake temp thermistor
(TH1)

PUH-8:22A
PUH-10:28A

TH1 -39˚C
88˚C TH1

Liquid temp thermistor
(TH2)

TH2 -39˚C
88˚C TH2

PUH-8:130

5˚C

80A in 3-10sec
PUH-10:105

5˚C

95A in 3-10sec

Compressor operating except for

3 minutes after the detection of

preliminary inlet temperature

sensor error

Compressor operationg except

for 7 minutes while compressor

starting and for 3 minutes after

the detection of preliminary pipe

temperature sensor error

(1) Protection functions

1) The main protection devices for the outdoor unit are:

a) High pressure protection (63H1)

b) Compressor overcurrent protection (51C)

c) Liquid temp thermistor trouble (TH1)

d) Discharge temperature protection (TH2

≥

118

e) Discharge temp thermistor trouble (TH2)

Low pressure protection (63L)

2) When tripping of a detection device is sensed, the check mode is entered and the compressor is stopped. (After 3

minutes, the compressor restarts.) Thereafter, the compressor is stopped when the specified number of check

modes or greater is sensed within the check time.

Protection functions

a) High pressure protection

(63H1)

b) Compressor

Outdoor unit

Indoor unit

overcurrent

protection (51C)

d) Liquid temp thermistor

trouble (TH1)

e) Discharge temperature

protection (TH2

135

f) Discharge temp ther-

mistor trouble (TH2)

Low pressure protection

(63L)

Operation value

3.3 MPa

Less

than –39

C or

greater than 88

Greater than 135

Less than 0

C or

greater than 216

0 MPa

Detection condition

Compressor operating

Compressor operating except for

10 minutes at end of defrosting

and 7 minutes while compressor

starting

Compressor operating

Compressor operating except for

10 minutes at end of defrosting

and 5 minutes while compressor

starting

Compressor operating except for

defrosting, 10 minutes at end of

defrosting

Number of

check modes

1 time

2 times

1 time

2 times

Check time

–

Compressor operating

–

30 minutes

2 times

30 minutes

2 times

30 minutes

3) Check mode is released by stopping operation, changing the operation mode, or check mode time up. A check

mode is also released by stopping of operation by remote controller.

4) Detected check mode history (newest) and abnormality history (last 2 times) are memorized and are displayed on

the segment by circuit board DIP switch setting.

The operation mode when the newest abnormality was generated, the thermistor temperature (TH1,2), and the

thermostat ON time can also be displayed.

1) Determines the operation mode and operates the compressor based on the indoor/outdoor communication or M-

NET communication data.

2) Compressor control has a function which prevents the compressor from restarting within 3 minutes.

3) The 4-way valve is always ON during heating (except during defrosting). In other modes, it is OFF. However, when

the operation mode was changed from heating to stop, the 4-way valve is turned off 10 minutes after the compres-

sor was stopped.

4) While the compressor is stopped, the crankcase heater remains ON. (OFF while the compressor is operating.)

5) When the operation mode is changed while the compressor is operating, the compressor stops and 3 minutes later

restarts in the new mode.

(2) Compressor, 4-way valve, and crankcase heater control

(3) Fan control

Controls the fan speed based on the piping temperature (TH1) to perform cooling at low outdoor temperatures and heating

at high outdoor temperatures.

1) Control at cooling

a) When the compressor stops, the fan stops (fan output=0%).

b) When the power is turned on, or when the compressor is restated after it has been stopped for 30 minutes or

longer, the piping temperature ( TH1) determines the fan output.

When TH

25˚C

Fan output = 100 %

When TH < 25˚C

Fan output = 60 %

c) When the compressor is restarted within 30 minutes after it has been stopped, the fan step before the compres-

sor was stopped is selected. However, when the fan output was under 30% when the fan was stopped, 30% is

selected.

d) When the mode was changed from heating to cooling, the fan step conforms to item 2.

e) Two minutes after the fan is started, the fan step (number of units) is controlled every 30 seconds based on the

piping temperature (TH1).

When TH1 reaches 55˚C or higher, or when the control high pressure switch (63H2) tripped, the fan output

becomes 100%.

g) Fan output while the compressor is operating is within the 20% to 100% range.

• FAN step

The following expression determines the next fan step count nj+1:

nj + 1 = nj +

∆

nj: Current fan step,

∆

nj: Displacement step amount

nj control

• If nj + 1

≥

100% nj + 1 = 100%

• If nj + 1 20%

nj + 1 = 20%

• If TH1

≥

C or 63H2 is “OFF”

nj + 1=100%

FAN

∆

Outputs are all %.

* In the night mode, the maximum value of nj is 80%. (When TH1 55˚C)

Target condensation

temperature 31

Condensation temperature TH1

≤

nj < 50

≤

nj < 100

Current

output

t > 49

t = 49

t > 46

t = 46

t > 43

t = 43

t > 40

t = 40

t > 36

t = 36

t > 33

t = 33

t > 29

t = 29

t > 26

–2

t = 26

t > 23

–2

t = 23

t > 20

–3

–4

≤

20 ˚C

–5

–10

T = 17

T > 15

–3

2) Control at heating

a) When the compressor is stopped and during defrosting, the fan is stopped.

b) When the power is turned on, or when the compressor is restarted after being stopped for 30 minutes or longer,

the piping temperature (TH1) determines the fan step.

TH1 8˚C

Fan output = 60%

TH1 < 8˚C

Fan output = 100%

c) When the compressor is restarted within 30 minutes, the fan step is the step before the compressor was stopped.

d) When the mode is changed from cooling to heating, the fan step conforms to item b).

e) When returning from defrosting, the fan step is the step before defrosting.

Two minutes after the fan was restarted, the fan step is controlled every 30 seconds based on the piping

temperature (TH1).

g) When TH1 is –5˚C or lower, the fan output is made 100%.

• FAN step

The following expression determines the next fan step count nj + 1:

nj + 1 = nj +

∆

nj: Current fan step,

∆

nj: Displacement step amount

nj control

• If nj + 1 100% nj + 1 = 100%

• If nj + 1

≤

20%

nj + 1 = 20%

• If TH1 < –5

nj + 1=100%

FAN

∆

Outputs are all %.

(4) Defrosting control

1) When the following conditions are satisfied, defrosting starts:

a) When the integrated compressor operation time has exceeded T

(initial setting 40 minutes) and the piping

temperature (TH1) is below –5˚C

b) When the integrated compressor ˚C

Piping differential temperature

∆

TH1 = TH10 – TH1

2) The defrosting prohibit time T

is set as following based on the defrosting time T

Note: T

is reset at the end of defrosting, or by cooling ON command.

Note: When the compressor was stopped during defrosting, T1 = 20 minutes is set to recognize the stop as

defrosting end.

3) During defrosting, all the outdoor fans are stopped and the bypass solenoid valve (SV1) is turned ON and the 4-way

valve (21S4) is turned OFF.

4) When the following conditions are satisfied, defrosting ends:

≤

5 mins

TH1

≤

b) 5 <

3 <

< 15 minutes

TH1

≤

C continuous 2 minutes

c) T

=15 minutes

5) When

6) When using PEH-16·20MYC, alternate defrosting is possible after sending and receiving each respective

outdoor unit defrost signal.

the fan and 4-way valve (21S4) are turned ON at the end of defrosting, the heating mode is reset. Two

minutes after defrosting reset, the bypass solenoid valve (SV1) turns OFF.

Target evaporation

temperature 10

Evaporation temperature TH1

≤

nj + 1

≤

100

Current

output

T > 19

–10

T = 19

T > 17

–4

T = 15

T > 13

–2

T = 13

T > 11

–2

T = 11

T > 8

T = 8

T > 6

T = 6

T > 4

T = 4

T > 2

T = 2

T > 0

≤

0˚C

Current piping temperature

Piping temperature 10 minutes after starting or

10 minutes after returning from defrosting

≤

3 (minutes)

60 (minutes)

3 < T

= 15

7 < T

10 < <

(6) Service functions

1) Abnormality history clear

a) When DIP SW1-2 is turned ON while the compressor is operating or stopped, the abnormality history is cleared.

(5) Bypass solenoid valve control (SV1)

1) Control at cooling

a) While the compressor is stopped, the solenoid valve is OFF.
b) When the power is turned on, or when the compressor is restarted after it has been stopped for 30 minutes or

longer, if the liquid temperature (TH1) is 25˚C or higher then the solenoid valve turns ON for 2 minutes.

c) When the power is turned on, or when the compressor restarted after it has been stopped for 30 minutes or

longer, the solenoid valve turns ON for 5 minutes if the liquid temperature (TH1) is staying below 25˚C.

d) The item b) or c) is applied to the mode change from heating to cooling.
e) When the previous operation mode is cooling and the compressor restarted within 30 minutes after it’s stopping

the tripping of 63H2, the solenoid valve turns ON for 2 minutes.

2) Control at heating

a) While the compressor is stopped, the solenoid valve is OFF.
b) When the power is turned on, or when the compressor restarted after it has been stopped for 30 minutes or

longer, the solenoid valve turns ON for 2 minutes if the liquid temperature (TH1) is staying above 8˚C.

c) When the power is turned on, or when the compressor restarted after it has been stopped for 30 minutes or

longer, the solenoid valve turns ON for 5 minutes if the liquid temperature (TH1) is staying below 8˚C.

d) The item b) or c) is applied to the mode change from cooling to heating.
e) When the control pressure switch (63H2) trips, the solenoid valve turns ON.
f) If 63H2 resets 15 minutes after tripping, the solenoid valve turns OFF.
g) During defrosting, the solenoid valve turns ON.
h) When the previous operation mode is heating and the compressor restarted within 30 minutes after it’s stopping

by the tripping of

63H2, the solenoid valve turns ON for 2 minutes.

i) When the previous operation mode is heating, and the compressor restarted within 30 minutes after the tripping

of 63L, the solenoid valve turns ON for 2 minutes.

11-3. FUNCTION OF SWITCHES AND CONNECTORS (OUTDOOR UNIT)

(1) Outdoor unit

OFF

1 2

4 5

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2

4 5

OFF

1 2

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

3 4

4 5

switches

1) Function of

switches

(Normal mode)

Switch

SW1

N33

When

open

)

(No

)

ormal)

SW2

SW3

SW4

SW5

Switch effec-

tive timing

–

Running or

stopped

When power

turned on

Running or

stopped

stopped*

stopped

–

When power

turned on

When power

turned on

Operation by switch operation

OFF

–

Clear

See pages 109 to 113.

Normal

Operate

Stop

Heat

Cool

Do not

Cooling only

Heat pump

Normal mode

SW3 =

Kind of

switch

DIP SW

Tact

DIP SW

Pole

1
2
3
4
5
6

1
2
1

Function

None

Abnormality history clear

Refrigerant system

address setting

Self diagnosis

Mode input register

run

Trial run mode switching

Inlet temp. re-reading

3-phase power source

detection

Cooling only switching

None

Function

Defrosting end switching

Defrosting prohibit time

switching

None

Switch effec-

tive timing

stopped

–

Switch

SW1

When
CN

N33

sho

orted

mode

switching)

switcching)

Operation by switch operation

OFF

–

Fixed

Training

–

Kind of

switch

DIP SW

Pole

1
2
3

*1 Trial run

trail run

by input

stopped. (For

see the trail run section)

*2 Mode input

SW3

→

Press and

down SW3 for about 2 seconds. The set

mode can be

b) Switch functions at set mode change

Note:

Factory setting

C continuous 2 minutes.

After

the mode by CN33

(mode switching), return to the normal mode by opening CN33.

C continuous 2 min-

utes

C continuous 2 min-

utes

Set input mode

CN33 = short SW3 = ON*

3, 4,

SW1 are ON.

None
None
None

–

–
–
–

c) Connector function assignment

Type

Connector

CN31

CN32

CN33

Function

Emergency operation

Function test

DIP switch mode switching

Operation by open/short

short

open

Start

Normal

Function mode

Normal

Mode switching

Normal

Switch effec-

tive timing

At initialization

stopped

CN3N-3

Snow sensor

Snow sensor control

Normal

Always

CN3N-2

Night mode

Normal

Always

CN3D-2

Switch cooling/heating

Heating

Cooling

Always

CN3D-3

Auto switching contact

Switch cooling/heating

Normal

Always

CN3S-2

Contact demand

Normal

Always

CN3S-3

Alternating defrost

Defrost signal from other unit

Normal

Always

Display

Check unit

Outdoor unit

Indoor unit 1

Indoor unit 2

Indoor unit 3

Indoor unit 4

Display

Compressor

4-way valve

Bypass solenoid valve

–

The operation status and check code contents can be ascertained by means of the 2-digit number and symbol on digital

display light emitting diode LED2 by operating DIP switch SW2.

• When ON (normal operation): Displays the operation mode.

• When blinking (Operation stopped by tripping protection device): Displays the check mode

[Tens digit: Operation mode]

Display

Operation mode

stopped

Cooling/Dry

Heating

Defrost

[Units digit: Relay output]

Display

Check contents (at power on)

Indoor-outdoor communication receive abnormal (outdoor unit)

Indoor-outdoor communication send abnormal (outdoor unit)

Indoor/outdoor connection erroneous wiring, number of indoor

units mismatch

Indoor/outdoor connection erroneous wiring (indoor unit power

failure, disconnection)

Serial communication abnormal (M-NET)

E0-E7

Communication other than outdoor unit abnormal

Input circuit faulty

SW2

LED2

1 2 3 4 5 6

OFF

(Load status)

2) Outdoor unit operation monitoring function

•

PUH-8,10

Display

Check contents (operating)

Compressor discharge temperature abnormal, CN23 short-circuit connector unplugged

Compressor discharge temp thermistor (TH2) open/short

Liquid temp thermistor (TH1) open/short

Compressor overcurrent protection trip (51C trip)

High pressure protection (63H1 trip)

Low pressure protection (63L trip)

P1-P9

Indoor unit abnormal

A0-A8

M-NET communication abnormal

100 times

10 hours

Check mode 1 display method

bit 1 ..... Compressor discharge temperature

abnormal

bit 2 ..... Compressor discharge temp thermistor

abnormal (TH2)

bit 3 ..... CN23 short-circuit connector un-

plugged

bit 5 ..... Liquid temp thermistor abnormal (TH1)

SW2 setting

Display contents

Description of display

Unit

Liquid temperature
(TH1)
–39 - 88

Discharge tempera-
ture (TH2)
0 - 216

FAN output
0 - 100

Number of compressor
ON/OFF
0 - 999

Compressor inte-
grated operation time
0 - 999

Current check mode
code 1

Current check mode
code 2

–39 - 88
(When 0

C or lower, “–”and temperature are displayed

alternately.)
<Example> When –10,

every other second
–

←→

0 - 216
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 115,

every other second
1

←→

0 - 100
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 100,

every other second
1

←→

0 - 999
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 425,

every other second
4

←→

0 - 999
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 245,

every other second
2

←→

Check mode segment display
method
Segment and bit correspon-
dence

Check mode 2 display method

bit 1 ..... Overcurrent trip (Comp)
bit 2 ..... Low pressure protection

Self diagnosis by SW2

• PUH-8,10

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

bit 1

bit 2

bit 3

bit 6

bit 7

bit 5

bit 4

bit 8

Newest check code
Newest outdoor unit
abnormality
Check display

Operation mode when
abnormality occurred

Liquid temperature
(TH1) when abnor-
mality occurred
– 39 - 88

COMP discharge
temperature (TH2)
when abnormality
occurred
0 - 216

Check code history (1)
(newest)
Abnormal unit No. and
check code inverted
display

Check code history (2)
(One before newest)
Abnormal unit No. and
check code inverted
display

Current thermostat
ON time
0 - 999

Number of indoor
units connected
0 - 4

When no check mode,“00”
<Example> When piping thermistor abnormal U4

Operation mode when abnormally stopped
<Example> Comp. only ON at cooling operation C4

–39 - 88
(When 0

C or lower, “–” and temperature are displayed

alternately.)
<Example> When –15,

every other second
–

←→

0 - 216
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 130,

every other second
1

←→

When no abnormality history
“0”, “

←→

”, “–”

When no abnormality history
“0”, “

←→

”, “–”

0 - 999
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 245,

every other second
2

←→

0 - 4

Code display

Minutes

Units

SW2 setting

Display contents

Description of display

Unit

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

–39 - 88
(When 0

C or lower, “–”and temperature are displayed

alternately.)
When there are no indoor units, “00” is displayed.

–39 - 88
(When 0

C or lower, “–”and temperature are displayed

alternately.)
When there are no indoor units, “00” is displayed.

–39 - 88
(When 0

C or lower, “–”and temperature are displayed

alternately.)
When there are no indoor units, “00” is displayed.

–39 - 88
(When 0

C or lower, “–”and temperature are displayed

alternately.)
When there are no indoor units, “00” is displayed.

8 - 39.5
When there are no indoor units, “00” is displayed.

17 - 30
When there are no indoor units, “00” is displayed.

Outdoor unit set
information

Indoor unit piping
temperature (TH2)
Indoor 1
–39 - 88

Indoor unit piping
temperature (TH2)
Indoor 2
–39 - 88

Indoor unit piping
temperature (TH2)
Indoor 3
–39 - 88

Indoor unit piping
temperature (TH2)
Indoor 4
–39 - 88

Indoor intake tem-
perature
8 - 39.5

Indoor set temperature
17 - 30

Code display

SW2 setting

Display contents

Description of display

Unit

Outdoor unit set information 1

Function setting (display valves)

3-phase power source detection Do

(1) Do not

(0)

Cooling only switching

Cooling only

(2) H/P

(0)

Night mode

(1) Normal mode

(0)

Defrosting end time

C continuous 2 minutes (2) 8

C continuous 2 minutes (0)

Defrosting prohibit time

Fixed

(4) Training

(0)

Tens digit

Units digit

Set information display values are added and displayed at each position.

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

Indoor unit control
status
Indoor 1, 2

Indoor unit control
status
Indoor 3, 4

Outdoor unit control
status

–

SW2 setting

Display contents

Description of display

Unit

Indoor unit No.1
Indoor unit No.3

Indoor unit No.2
Indoor unit No.4

Control mode

Indoor unit

Ordinary

Hot adjustment

Defrosting

—

Heater ON

Freeze prevention

Surge prevention

Compressor OFF

Display

0
1
2
3
4
5
6
7

Outdoor unit

←
←
←
←
←
←
←
←

Control mode display system

Indoor unit No.1
Indoor unit No.3 Outdoor unit

Indoor unit No.2
Indoor unit No.4

Control mode

Indoor unit

Ordinary

Hot adjustment

Defrosting

—

Heater ON

Freeze prevention

Surge prevention

Compressor OFF

Display

0
1
2
3
4
5
6
7

Outdoor unit

←
←
←
←
←
←
←
←

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

Communication de-
mand capacity
0 - 255

Abnormal thermistor
display
1, 2, –

FAN output at abnor-
mal stop
0 - 100

Outdoor Condenser/
evaporater temp tem-
perature at abnormal
stop
–39 - 88

0 - 255
When communication demand not set: 100%
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 100,

every other second
1

←→

100

1, 2, –
1: Outdoor liquid temp thermistor (TH1)
2: Outdoor discharge temp thermistor (TH2)
–: No abnormal thermistor

0 - 100
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 100,

every other second
–

←→

–39 - 88
(When 0

C or lower, “–”and temperature are displayed

alternately.)
<Example> When –10,

every other second
–

←→

–10

–

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

Thermostat ON time up
to abnormal stop
0 - 999

Indoor unit condenser/
evaporater temp tem-
perature (TH3)
Indoor 1
–39 - 88

Indoor unit condenser/
evaporater temp tem-
perature (TH3)
Indoor 2
–39 - 88

Indoor unit condenser/
evaporater temp tem-
perature (TH3)
Indoor 3
–39 - 88

Indoor unit condenser/
evaporater temp tem-
perature (TH3)
Indoor 4
–39 - 88

0 - 999
(When 100 or higher, 100s digit and 10s and units digits
are displayed alternately.)
<Example> When 245,

every other second
2

←→

–39 - 88
(When 0 ˚C or lower, “–”and temperature are displayed
alternately.)
When there are no indoor units, “00” is displayed.

Minutes

˚C

SW2 setting

Display contents

Description of display

Unit

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

GROUP CONTROL

(1) Notes on performing group control

• Up to 16 indoor units can be sequentially started up with each remote controller.

• Up to two remote controllers can be connected to each group.

(Up to two wired remote controllers can be connected. There are no restrictions on the number of wireless controllers
that can be connected.)

• The ON/OFF control of the room temperature is performed individually for each refrigerant system with the inlet

thermistor that is built-in on the unit.

Indoor unit No. (Refrigerant address)

Indoor unit No. (Unit No.)

Operation content

No. 3 ON

Refrigerant address

Delay time (sec.)

Power supply to the remote
controller (main indoor unit)

Switch setting

Automatic setting

Connect the remote controller to an indoor unit, and daisy-chain all indoor units.

Make the refrigerant address setting for each indoor unit, and turn on the power.

When connecting two remote controllers, the two controllers cannot be daisy-chained. Make the connections
through indoor units.

Refrigerant addresses are also used by the sequential start up timer (4 second interval) to prevent rush current.

In this case, the delay time will be between 0 and 9.

If any of the indoor unit addresses overlap, correct indoor unit cannot be identified during self-diagnosis or function
selection. Assign a different refrigerant address to all indoor units, following the setting procedures below.

At factory shipment, switches 3 through 6 of SW1 are all set to OFF, and the refrigerant address is set to “0.”

(Example) Sequential start up timer set to 12 seconds

* Varies depending on the number of connected indoor units and remote controller operation timing.

According to the combination of switches 3 through 6 above, units can be sequentially started up at 1-second
intervals between address 1 and address 15 (Delayed time between 10 and 24 seconds).

Set the refrigerant address before turning on the power.

*The remote controller power supply unit is automatically set to the indoor unit with the refrigerant address of 01.
(LED 2 comes on.)

1 2 3 4 5 6

OFF

No. 4 ON

1 2 3 4 5 6

OFF

No. 5 ON

1 2 3 4 5 6

OFF

No. 6 ON

1 2 3 4 5 6

OFF

12 = 8 + 4

No. 5 and 6 switches ON

Main
Outdoor unit

Outdoor unit 00

Outdoor unit 01

Outdoor unit 02

Outdoor unit 15

00-1

Sub
Outdoor unit

01-1

Sub
Outdoor unit

02-1

Sub
Outdoor unit

15-1

Deluxe remote controller

NOTES FOR M-NET <MELANS> WIRING CONNECTION

(1) Example: Wiring system (When M-NET <MELANS> [Option] is used)

TB7

TB5

TB4

TB3

TB7

TB3

TB5

TB4

TB5

TB4

TB7

TB3

TB7

TB3

[00]

007

[01]

008

[00]

006

051

001

101

103

002

003

004

005

MELANS

In the case without group operation

: Indoor unit

: M-NET transmission line
(MELANS)

: Indoor/outdoor
transmission line

: Remote controller line

: Remote controller

In the case with group operation

Numbers inside [ ] : outdoor unit address

To Slim outdoor unit

To Y series outdoor unit

Magnified view of section “A”

Shield line

Numbers inside : M-NET (MELANS) address

TB7

<Wiring connection sample>

MELANS
To TB7 of other outdoor unit

Magnified view of section “A”

Use a switch or a breaker for

wiring connection together

with an earth leakage breaker

when it is only for ground fault

protection

use.

TB7

Free Compo Multi

(Connected with two indoor units)

Grouping

(Connected with up to 16 indoor units)

1: 1 system

Model without a heater

For detailed M-NET <MELANS> wiring connection, refer to the MELANS installation manual.

R S

S1 S2 S3

R S T

A B S

Outdoor unit

r supply

Ear

th leakage break

Ear

th leakage break

Ear

th leakage break

Ear

th leakage break

Ear

th leakage break

Ear

th leakage break

Switch

Earth

Remote controller

M-NET

Switch

Indoor unit

R S

S1 S2 S3

A B S

Outdoor unit

Earth

Remote controller

M-NET

Indoor unit

R S

S1 S2 S3

A B S

Outdoor unit
(Address 0)

Earth

Remote

controller

M-NET

R S

S1 S2 S3

A B S

Outdoor unit
(Address 14)

Earth

M-NET

R S

S1 S2 S3

A B S

Outdoor unit
(Address 15)

Earth

M-NET

Indoor unit

S1 S2 S3

Indoor unit

S1 S2 S3

Indoor unit

S1 S2 S3

Indoor unit

S1 S2 S3

Indoor unit

Slim outdoor unit

Y series outdoor unit

OFF

1 Compulsory defrosting

2 Deletion of error history

3 Refrigerant address setting

Start

Deletion

OFF

Normal

Address setting of outdoor unit

(0-15)

SW1

Function

selection

Model

Operation according to switch setting

(SW1)

Refrigerant address No.

SW11

(1's digit)

SW12

(10's digit)

Address setting of outdoor unit

Address setting of M-NET (MELANS) [Option]

· Address setting of each outdoor unit is required when group control is used.
· Dip SW1 (3-6) on the circuit board < All are set to OFF at factory shipment. > is used to set the address of outdoor unit.
(Address setting is not required for 1: 1 system and Free Compo Multi.)
· Address setting with SW1 is shown below.

Set M-NET (MELANS) address among 1~50. Assign the smallest

address in a group to the M-NET (MELANS) connected with the
outdoor unit whose address is 0. (Refer to the wiring connection
sample.)

Use the rotary switches SW11 and SW12 inside the control box on

the M-NET circuit board to set the address. (SW11: 1's digit,
SW12: 10's digit < They are set to 0 at factory shipment. >)
Note that 10's digit is on the right, and 1's digit is on the left
on the actual switch.

Switch

setting

M-NET address

→
→
→

(2) Address Setting

EMERGENCY OPERATION

1) When the following check displays occur at the outdoor unit, or when the wired remote controller or indoor unit

microcomputer fails, if there are no other defects, emergency operation is possible by shorting the connector (CN31)

on the outdoor controller board.

• Abnormalities that allow emergency operation

2) Check items and precautions when performing emergency operation

a) In addition to the abnormalities above, check the outdoor unit for any abnormalities. (When there is an abnor-

mality other than the above, emergency operation is impossible.)

b) Check the operating range. (For U4 display)

Since the outdoor fan always operates at full speed at emergency operation, do not operate the air conditioner

outside the range shown below.

Operation outside this range may cause com-

pressor trouble.

c) When performing emergency operation, set the outdoor unit after setting the emergency operation switch (SWE)

on the indoor controller board. For the indoor emergency operation method, refer to the indoor unit wiring

diagram.

d) A power failure causes emergency operation to become continuous operation. ON/OFF, temperature adjust-

ment and other operations cannot be performed from the remote controller.

(When a PEH-8,10,16,20 indoor unit is connected, check that the special indoor unit power is turned on,

then start emergency operation.)

e) Since cool air is discharged from the indoor unit, when the outdoor unit starts the defrosting operation during

heating emergency operation, do not operate the air conditioner for a long time.

You can perform cooling emergency operation up to 10 hours. The indoor unit heat exchanger may freeze.

g) At the end of emergency operation, always return the switch settings, etc. to their original state.

3) Emergency operation contents

a) The operation mode operates according to the contents set (cooling or heating) by SW4-2.

b) The fan operation condition is always 100% operation.

c) The operation mode display flashes every other second.

Display

Check contents

Liquid temp thermistor (TH1) open or shorted

Indoor-outdoor communication receive abnormal (outdoor unit)

Indoor-outdoor communication send abnormal (outdoor unit)

E0 - E7

Communication other than outdoor unit abnormal

Operation range (outdoor unit intake temperature)

Cooling

geater than 20

Heating

less than 10

Start

Piping work complete?

Turn on indoor power *1

Check that mains power is OFF

Turn on mains power

Turn on emergency operation switch
(SWE) on indoor controller board

Short CN31 (emergency operation
connector) on outdoor controller board

Check that emergency operation starts,
and that operation mode display flashes

Set operation mode (cooling or heating) with SW4-2 on outdoor board
(SW4-1 not used)

SW4

Cooling

Heating

OFF ON

YES

4) Emergency operation method

* Before starting, recheck that the trouble allows

emergency operation.

*1 Only when PEH-8,10,16,20 indoor unit connected.

*1. When PEH-8,10,16,20 indoor unit is connected,

first turn off the outdoor unit power,then turn off

the indoor unit power.

Emergency operation release method

Turn off mains power. (Outdoor, indoor)
*1

Turn on mains power

Turn off emergency operation switch
(SWE) on indoor controller board

Open CN31 (emergency operation
connector) on outdoor controller board

SW4

OFF ON

Set SW4-2 as shown below

SELF-DIAGNOSIS AND TROUBLESHOOTING

Abnormal-
ity display

None

Meaning of abnormality display and
abnormality troubleshooting

Indoor/outdoor connection erro-
neous wiring, too many indoor
units (5 or more)
1. Outdoor controller board automati-

cally recognizes the number of
connected indoor units. However,
when the number of connected in-
door units cannot be set due to er-
roneous indoor/outdoor connec-
tion, erroneous wiring, etc. even
after 4 minutes have elapsed since
the power was turned on, an ab-
normality is recognized.

2. When the outdoor controller board

identified “5 or more” connected in-
door units, an abnormality is rec-
ognized.

Indoor/outdoor connection erro-
neous wiring
The outdoor controller board auto-
matically sets the unit No. of the in-
door units. However, when the unit
No. of the indoor units cannot be set
due to indoor/outdoor connection er-
roneous wiring even after 4 minutes
has elapsed since the power was
turned on, an abnormality is recog-
nized.

Start-up time over
When start-up processing does not
end even through 4 minutes has
elapsed since the power was turned
on, an abnormality is recognized.

Reverse phase detected

Missing phase detected

Cause

(1) Voltage not applied to outdoor unit ter-

minal block TB1.

a. Power supply circuit breaker not

closed.

b. Power supply terminals connection

faulty, or disconnected.

c. Missing phase (R or S phase)

(2) No electricity at controller board power

supply connector.

a. Power supply connector contact

faulty.

b. Terminal R/1 or S/2 on controller

board disconnected.

(3) Outdoor unit controller board faulty.

a. Blown fuse on controller board.
b. Part faulty.

(1) Indoor/outdoor connection wire con-

tact faulty or erroneous wiring.

(2) Indoor/outdoor connection wire diam-

eter or wiring length outside specifi-
cation.

(3) Five or more indoor units connected

to outdoor unit.

(4) Outdoor controller board send/receive

circuit faulty.

(5) Indoor controller board send/receive

circuit faulty.

(6) Noise has entered on power supply

or indoor/outdoor connection wire.

(1) Indoor/outdoor connection wire con-

tact faulty, or erroneous wiring.

(2) Indoor/outdoor connection wire diam-

eter or wiring length outside specifi-
cation.

(3) Outdoor controller board send/receive

circuit faulty.

(4) Indoor controller board send/receive

circuit faulty.

(5) Noise has entered on power supply

or indoor/outdoor connection wire.

(1) Indoor/outdoor connection wire con-

tact faulty.

(2) Indoor/outdoor connection wire diam-

eter or wiring length outside specifi-
cation.

(3) Noise has entered on power supply

or indoor/outdoor connection wire.

Power supply reverse phase connection.

Power supply missing phase.

Judgment method and remedy

(1)

a. Check power supply circuit breaker.
b. Check power supply terminal block

connections.

c. Check power supply terminal block

connections.

(2)

a. Check power supply connector board

connections.

(3)

a. Replace fuse.
b. Replace controller board.

(However, when cannot be repaired
even through the check above was
carried out.)

(1) Check if indoor unit or outdoor unit in-

door/outdoor connection wire discon-
nected or loose. Also check polarity.

(2) Check indoor/outdoor wire diameter

and wiring length.
Outdoor-indoor: Max. 50m
Indoor-indoor (span): Max. 30m
Also check that VVF and other flat
cables are connected in S1, S2, S3 or-
der. (S2 in the middle)

(3) Check number of indoor units con-

nected to outdoor unit.

(4) Check by turning power off and on.

If abnormality is displayed again, re-
place outdoor controller board or indoor
controller board.

LED3 of the indoor controller board
flashes when communication is being
performed.

(1) Check power supply terminal block

connections.

(2) Replace controller board

(However, when cannot be repaired

even though check above was carried

out.)

Abnormal-
ity display

Meaning of abnormality display and
abnormality troubleshooting

Discharge temperature abnormal
When the discharge thermistor tem-
perature (TH2) exceeds 135

C while

the compressor is operating, an ab-
normality is recognized.

49C trip (CN23 connector discon-
nected)
When connector CN23 opens while
the compressor is operating, an ab-
normality is recognized.

Discharge temp thermistor (TH2)
open or shorted.
When an open (0

C or lower) or

short (216

C or higher) is detected

while the compressor is operating, an
abnormality is recognized.
(Detection is disabled for 5 minutes
at compressor starting.)

Liquid temp thermistor (TH1)
open or shorted.
When an open (–39

C or lower) or

short (88

C or higher) is detected

while the compressor is operating, an
abnormality is recognized. (Detection
is disabled for 7 minutes beginning
from 10 seconds after the compres-
sor starts and for 10 minutes after
return from defrosting.)

Compressor overcurrent trip
When the current value reaches the
overload set value or higher while the
compressor is operating, an abnor-
mality is recognized.
PUH-8

................................. 22 A

PUH-10 ................................. 28 A

High pressure abnormal (63H1
trip)
Detected (3.3

-0.15

MPa) by 63H1 trip

while compressor is operating.

63H1: Pressure switch (high pres-

sure)

OFF: 3.3 MPa

Cause

(1) Compressor overheating due to insuf-

ficient refrigerant.

(2) Thermistor faulty. (TH2)
(3) Outdoor controller board faulty.

(1) Shorting connector CN23 on outdoor

controller board dislodged or contact
faulty.

(1) Connector (CN3) dislodged or con-

nect faulty.

(2) Thermistor faulty.

(3) Outdoor controller board faulty.

(1) Connector (TH1: CN2) dislodged or

contact faulty.

(2) Thermistor faulty.

(3) Outdoor controller board faulty.

(1) Overload operation exceeding unit us-

age range limit.

(2) Power supply terminal voltage low.
(3) Power supply missing phase.
(4) Compressor motor faulty.
(5) Compressor locked.
(6) Connector (CN22) on outdoor control-

ler board dislodged or contact faulty.

(7) 51C disconnected or contact faulty.

(1) Started with ball valve closed.
(2) Connector (CN21) on outdoor control-

ler board dislodged or contact faulty.

(3) 63H1 disconnected or contact faulty.
(4) Indoor filter clogged. Power reset de-

tected during heating overload opera-
tion (Heating).

(5) Low indoor unit air flow (heating).
(6) Low outdoor unit air flow (cooling).
(7) Part faulty.

Judgment method and remedy

(1) Check input super heat.

Check for refrigerant leakage and
check piping length.
Charge with additional refrigerant.

(2)(3)

Turn off power and restart operation
and check if U3 is displayed within 8
minutes.
When U3 is displayed, carry out U3 pro-
cessing.
(Do not replace board at U2 display
only.)

(1) Repair shorting connector.

(1) Check connector contact and ther-

mistor wire.

(2) Check thermistor resistance value, or

check temperature by microcomputer.
(Check using SW2 self-diagnosis func-
tion.)
See page 24.

(3) Replace outdoor controller board.

(Replace board after sufficiently check-
ing 1 and 2.)

(1) Check connector contact and ther-

mistor wire.

(2) Check thermistor resistance value or

check temperature by microcomputer.
(Check using SW2 self-diagnosis func-
tion.)
See to page 24.

(3) Replace outdoor controller board.

(Replace board after sufficiently check-
ing 1 and 2)

(1) Check usage conditions.

(Check for short cycle operation.)

(2) Check power supply voltage.
(3) Check wiring for breaks and faulty con-

tact.

(4) Check motor winding resistance (See

page 7.)

(5) Replace compressor.
(6)(7)

After checking connections, restart and
check operation.

(1) Check if ball valve is fully open.
(2)(3)

Repair connector.

(4) Check indoor filter.
(5) Check flow duct static pressure and for

faulty fan motor.

(6) Check for faulty outdoor fan motor.
(7) Replace pressure switch.

Abnormal-
ity display

Meaning of abnormality display and
abnormality troubleshooting

Low pressure abnormal (63L trip)
Detected by tripping of 63L while the
compressor is operating. (Ignored
during defrosting and for 10 minutes
at defrosting return.)
63L: Pressure switch (low pressure)
OFF: 0 MPa

Remote controller communica-
tions receive abnormal (remote
controller).
1) When transmission from refriger-

ant address “0” IC is not received
normally even once in 3 minutes,
an abnormality is recognized.

2) When a slave remote controller

does not receive even one signal
in 2 minutes, an abnormality is
recognized.

Remote controller communication
send abnormal (remote controller)
1) When the remote controller can

not confirm that the transmission
circuit is idle in 6 seconds, an ab-
normality is recognized.

2) When the remote controller can-

not complete 30 continuous trans-
missions, an abnormality is rec-
ognized.

Indoor-outdoor communication
receive abnormal
(Outdoor unit)

When the outdoor controller can
not receive normally even once in
3 minutes, an abnormality is rec-
ognized.

Indoor-outdoor communication
send abnormal
(Outdoor unit)
1) When the outdoor controller

detectes reception of 30 consecu-
tive “0” even through “1” was re-
ceived, an abnormality is recog-
nized.

2) When the outdoor controller can

not confirm that the transmission
circuit is idle in 3 minutes, an er-
ror is recognized.

Check code undefined
Displayed when an undefined check
code is received.

Cause

(1) Started with ball valve closed.
(2) Connector (CN27) on outdoor control-

ler board open or contact faulty.

(3) 63L disconnected or contact faulty.
(4) Part faulty.

(1) Remote controller send/receive

circuit faulty.

(2) Refrigerant address “0” indoor control-

ler board send/receive circuit faulty.

(3) Noise entered on remote controller

transmission line.

(1) Remote controller send/receive circuit

faulty.

(2) Noise entered on remote controller

transmission line.

(1) Indoor/outdoor connection wire con-

tact faulty.

(2) Outdoor controller board send/receive

circuit faulty.

(3) Indoor controller board send/receive

circuit faulty.

(4) Noise entered on indoor/outdoor con-

nection wire.

(1) Outdoor controller board send/receive

circuit faulty.

(2) Noise entered at power supply.
(3) Noise entered on indoor/outdoor con-

nection wire.

(1) Noise entered on remote controller

transmission line.

(2) Noise entered on indoor/outdoor con-

nection wire.

Judgment method and remedy

(1) Check if ball valve fully open.
(2)(3) Repair connector.

(4) Replace pressure switch.

Perform remote controller diagnosis.
Take the following action based on the di-
agnosed result:
a) [RC OK] display

Remote controller normal.
Turn power off and on and check.
If “PLEASE WAIT” remains on for
4 minutes or longer, replace indoor
controller board.

b) [RC NG] display

Replace remote controller.

c) [RC E3] display

[ERC00-66]

(1) Check for disconnected or loose indoor

unit or outdoor unit indoor/outdoor con-
nection wire.

(2)-(4)

Turn power off and on and check.
If abnormality displayed again, replace
indoor controller board or outdoor con-
troller board.

(1)(2)(3)

Turn power off and on and check.
If abnormality displayed again, replace
indoor controller board or outdoor con-
troller board.

(1)(2)

Turn power off and on and check.
If abnormality displayed again, replace
indoor controller board or outdoor con-
troller board.

Noise, etc. probable
cause.







Abnormal-
ity display

Meaning of abnormality display and
abnormality troubleshooting

Intake sensor abnormal
1) If thermistor open or short is de-

tected and the compressor enters
the 3 minutes restart prevention
mode and does not return to nor-
mal after 3 minutes, an abnormal-
ity is recognized.
(If returned, returns to normal op-
eration.)

2) Always detected during cool, dry,

and heat operations.
Short: 90

C or higher

Open: –40

C or lower

Piping (liquid) sensor abnormal
1) If thermistor short or open is de-

tected and the compressor enters
the 3 minutes restart prevention
mode and does not return to nor-
mal after 3 minutes, an abnormal-
ity is recognized.
(If returned, returns to normal op-
eration.)

2) Always detected during cool, dry,

and heat (except during defrost-
ing) operation.
Short: 90

C or higher

Open: –40

C or lower

Drain sensor abnormal
1) If thermistor short or open continu-

ously detected for 30 seconds, the
compressor enters the check
mode and turns off and the indoor
fan turns off.

2) When another short or open is

continuously detected for 30 sec-
onds in the check mode, an ab-
normality is recognized.
(If returned, returns to normal op-
eration.)

3) Always detected during cool, dry,

and drain pump operation.
Short: 90

C or higher

Open: –20

C or lower

Cause

(1) Thermistor characteristics faulty.
(2) Connector contact faulty.

(Insertion faulty)

(3) Thermistor wiring open or contact

faulty.

(4) Indoor controller board faulty.

(1) Thermistor characteristics faulty.
(2) Connector contact faulty.

(Insertion faulty)

(3) Thermistor wiring open or contact

faulty.

(4) Faulty refrigerant circuit, etc. has

caused thermistor temperature to rise
to 90

C or higher or drop to –40

or lower.

(5) Indoor controller board faulty.

(1) Thermistor characteristics faulty.
(2) Connector contact faulty.

(Insertion faulty)

(3) Drain sensor wiring open or contact

faulty.

(4) Indoor controller board faulty.

Judgment method and remedy

(1)-(3)

Check thermistor resistance value

C ...... 15.0 k

Ω

C ........ 9.7 k

Ω

C ........ 6.4 k

Ω

C ........ 5.3 k

Ω

C ........ 3.1 k

Ω

Open or faulty contact can be detected
by applying force (pulling, bending) to
lead wire while measuring thermistor
resistance.

(2) Check for connector faulty contact.

After reinserting connector, turn on
power and recheck operation.

(4) Check remote controller room tempera-

ture display.
If there is a difference between actual
room temperature and displayed room
temperature after checking that there
are no problems at (1)-(3), replace in-
door controller board.
If there are no problems above, there
are no abnormalities.
Turn power off and on and operate.

(1)-(3)

Check thermistor resistance value.
For characteristic, see above (P1).

(2) Check for connector faulty contact.

After reinserting connector, turn on
power and recheck operation.

(4) Operate in trail run mode and check

piping temperature with remote control-
ler. When piping temperature is abnor-
mally low (cooling) or high (heating),
refrigerant circuit is probably faulty.

(5) Check test run mode piping tempera-

ture with remote controller.
If there is a difference between actual
piping temperature and displayed pip-
ing temperature when there are no ab-
normalities at (1)-(4), replace indoor
controller board. If there is no problem
above, there are no abnormalities.
Turn on power and operate.

(1)-(3)

Check thermistor resistance value.

C .... 6.0 k

Ω

C .... 3.9 k

Ω

C .... 2.6 k

Ω

C .... 1.8 k

Ω

C .... 1.3 k

Ω

(2) Check connector for faulty contact.

After reinserting connector, turn on
power and recheck operation.

(4) If abnormality reproduced by shorting

between drain sensor connector CN31
pins 1 and 2 and operating air condi-
tioner, replace indoor controller board.
If there are no problems above, there
are no abnormalities.
Turn on power and operate.

Abnormal-
ity display

Meaning of abnormality display and
abnormality troubleshooting

Drain overflow protection opera-
tion
1) When the drain sensor thermistor

overheats and the temperature
rise is small, the compressor en-
ters the check mode and is turned
off and the indoor fan is turned off.

2) If the state above is detected again

in the check mode, drain pump
abnormality is recognized.

3) Always detected during drain

pump operation.

Water leakage abnormality (PDH
only)
1) When the drain sensor thermistor

overheats and the temperature
rise is small, the compressor en-
ters the check mode and the drain
pump is turned on for 6 minutes.
(Detection: 1 time/hour)

2) If the state above is detected

again within 12 hours after the
check mode was entered, a wa-
ter leakage abnormality is recog-
nized.

3) Detected during stop, fan, and

heat operation.

Freezing/excessive rise protection
operation
1) Freezing protection

When the piping temperature re-
mains at –15

C or lower for 3 min-

utes after 3 minutes have elapsed
since the compressor started, the
compressor enters the 6 minutes
restart prohibit mode and if the
piping temperature again remains
at –15

C for 3 minutes within 16

minutes after 6 minutes restarting,
an abnormality is recognized.

2) Excessive rise protection

When a piping temperature rise
to 70

C or higher is detected af-

ter the compressor starts, the
compressor enters the 6 minutes
restart prohibit mode. If a piping
temperature rise up to 70

C or

higher is detected again within 10
minutes after 6 minutes restarting,
an abnormality is recognized.

Cause

(1) Drain pump trouble.
(2) Drain faulty.

Drain pump clogged.
Drain pipe clogged.

(3) Water droplets on drain sensor.

Drain water waves created by trans-
mission of drain water from lead wire,
clogged filter, etc.

(4) Indoor controller board faulty.

(1) Water leaking from humidifier water

supply pipe.

(2) Water droplets on drain sensor.
(3) Indoor controller board faulty.

<Cool and dry>
(1) Filter is clogged (insufficient air flow).
(2) Air duct short cycle.
(3) Low load operation (low temperature)

exceeding allowable range.

(4) Indoor fan motor faulty.
(5) Outdoor fan control faulty (intermedi-

ate period, winter).

(6) Refrigerant overcharged.
(7) Refrigerant circuit faulty (clogged).

<Heat>
(1) Filter clogged (insufficient air flow)
(2) Air duct short cycle.
(3) Overload operation (high tempera-

ture) exceeding allowable range.

(4) Indoor fan motor faulty.
(5) Outdoor fan control faulty (intermedi-

ate period)

(6) Refrigerant overcharged.
(7) Refrigerant circuit faulty (clogged)
(8) Outdoor unit bypass circuit faulty.

Judgment method and remedy

(1) Check drain up mechanism.
(2) Check drain characteristic.
(3) Check drain sensor lead wire arrange-

ment and check for filter clogging.

(4) If abnormality reproduced by shorting

(1) Repair water leakage.
(2) Check drain sensor lead wire arrange-

ment and check for filter clogging.

(3) If abnormality reproduced by shorting

<Cool and dry>
(1) Check filter for clogging.
(2) Remove obstruction.
(4) Check fan motor operation and wind-

ing resistance.

(5) Check outdoor fan motor operation.
(6)(7)

Check refrigerant circuit operation.

<Heat>
(1) Check filter for clogging.
(2) Remove obstruction.
(4) Check fan motor operation and wind-

ing resistance.

(5) Check outdoor fan motor operation.
(6)-(8)

Check refrigerant circuit operation.

Abnormal-
ity display

Meaning of abnormality display and
abnormality troubleshooting

Piping temperature abnormal
<Cool>
When the piping temperature stays
outside the cooling area for 1 minute
after 3 minutes have elapsed since
the compressor was started, the in-
door fan operates at low speed. If the
piping temperature does not return
to the cooling area after 5 minutes
operation at low speed, an abnormal-
ity is recognized.
Note 1) It takes a minimum of 9 min-

utes for an abnormality to be
detected.

Note 2) At dry operation, P8 abnor-

mality is not detected.

<Heat>
When the piping temperature falls
outside the heating area and enters
the ventilation area after compressor
operation and the end of hot adjust,
the indoor fan stops and the piping
temperature does not return to the
heating area within 20 minutes after
10 seconds have elapsed after it left
the heating area, an abnormality is
recognized.
Note 3) It takes a minimum of 22

minutes and a maximum of
27 minutes for an abnormal-
ity to be detected.

Note 4) Except during defrosting

(Detected again after de-
frosting return.)

Cause

(1) Indoor intake piping thermistor tem-

perature differential small.
- EInsufficient refrigerant
- EPiping thermistor holder dislodged.
- ERefrigerant circuit faulty.

(2) Extension piping (When multiple units

connected).

(3) Indoor/outdoor connection wire

(When multiple units connected).

(4) Indoor intake piping thermistor detec-

tion faulty.

Judgment method and remedy

(1) Operate in test run mode and check

piping temperature.

(2)(3)

Check extension piping or indoor/out-
door connection wire.

(4) Check remote controller room tempera-

ture display and piping temperature in
test run mode.

Piping (2-phase pipe) sensor
abnormal
1) If thermistor short or open is de-

tected and the compressor enters
the 3 minutes restart prevention
mode and does not return to nor-
mal after 3 minutes, an abnormal-
ity is recognized.
(If returned, returns to normal op-
eration.)

2) Always detected during cool, dry,

and heat (except during defrost-
ing) operation.
Short: 90

C or higher

Open: –40

C or lower

(1) Thermistor characteristics faulty.
(2) Connector contact faulty.

(Insertion faulty)

(3) Thermistor wiring open or contact

faulty.

(4) Faulty refrigerant circuit, etc. has

caused thermistor temperature to rise
to 90

C or higher or drop to –40

or lower.

(5) Indoor controller board faulty.

(1)-(3)

Check thermistor resistance value.
For characteristic, see above (P1).

(2) Check for connector faulty contact.

After reinserting connector, turn on
power and recheck operation.

(4) Operate in trail run mode and check

piping temperature with remote control-
ler. When piping temperature is abnor-
mally low (cooling) or high (heating),
refrigerant circuit is probably faulty.

(5) Check test run mode piping tempera-

Abnormal-
ity display

Meaning of abnormality display and
abnormality troubleshooting

Remote control communication re-
ceive abnormal
1) When the indoor controller board

can not receive data normally
from the remote controller or an-
other indoor controller board even
once in 3 minutes, an abnormal-
ity is recognized.

2) When the indoor controller board

can not receive signals even once
in 2 minutes, an abnormality is
recognized.

Cause

(1) Remote controller transmission line

contact faulty.

(2) All remote controllers set as “slave”

remote controller.

(3) Remote controller send/receive circuit

faulty.

(4) Indoor controller board send/receive

circuit faulty.

(5) Noise entered on remote controller

transmission line.

Judgment method and remedy

(1) Check if indoor unit or remote control-

ler transmission line disconnected or
loose.

(2) Set one remote controller as “master”.

When there are no problems at the
above

(3) Perform remote controller diagnosis.
a) [RC OK] display

Remote controller normal.
Check by turning power off and on.
If the abnormality occurs again, replace
indoor controller board.

b) [RC NG] display

Replace remote controller.

c) [RC E3] display

[ERC00-66] noise, etc. is probable
cause.

Normal boot-up completed.

No error occurs, therefore no countermeasures

possible.

No error occurs, therefore no countermeasures

possible.

No error occurs, therefore no countermeasures

possible.

Normal stoppage

No power to remote controller and so

inoperable.

Error can be confirmed at outdoor unit LED.

(1) Repair cable C

ommunication error detected at No.1 and No.2

system indoor unit due to remote controller

error, however, no error reported at remote

controller as inoperable during stoppage.

The outdoor unit for address 00 is no longer

connected to the system, and operation is not

possible as there is no power supply to the

remote controller. Error can be confirmed at

outdoor unit LED.

(1) Repair cable A.

[Emergency Repair]

(1)

Set to the No.2 address 00 and cut the power

to the No.1 outdoor unit. (single system

operation.) Change No.1 address to 01.

The outdoor unit for address 00 is no longer

connected to the system, and operation is not

possible as there is no power supply to the

remote controller, resulting in an error.

Unable to boot up system No.2 and error

detected at both the outdoor and indoor unit,

however, the remote controller cannot be used

during the stoppage, and therefore no error is

indicated. Error can be confirmed at outdoor unit

LED.

(No.1 system has booted up and therefore

operation is possible.)

(1) Repair cable B.

[Emergency Repair]

(1) Cut power to outdoor unit No.2.

Single system operation.

Error detected at both No.2 outdoor and indoor

unit, however, the remote controller cannot be

used during the stoppage, and therefore no

error is indicated.

Communication error detected at No.2 system

indoor unit, however, no error reported at

remote controller when D breakage occurs.

Error can be confirmed at outdoor unit LED.

(No.1 system has booted up and therefore

operation is possible.)

(1) Repair cable D

ommunication error detected at No.2 system

indoor unit, however, no error reported at

remote controller when D breakage occurs. No.2

system cannot be operated.

No error occurs, therefore no countermeasures

possible.

No error occurs, therefore no countermeasures

possible.

No error occurs, therefore no countermeasures

possible.

(1) Repair cable C

(1) Repair cable A.

[Emergency Repair]

(1)

Set to the No.2 address 00 and cut the power

to the No.1 outdoor unit. (single system

operation.) Change No.1 address to 01.

(1) Repair cable B.

[Emergency Repair]

(1) Cut power to outdoor unit No.2.

Single system operation.

(1) Repair cable C

Error Details

Recommended Countermeasure

Error Details

Recommended Countermeasure

No No.1 system stoppage.

No.2 system error stoppage.

Remote controller indicates error, however,

remote controller operation is not possible other

than at stoppage. (Fan stoppage.)

No No.1 system stoppage.

No.2 system error stoppage.

Remote controller indicates error, however,

remote controller operation is not possible other

than at stoppage. (No fan stoppage.)

No.1 system error stoppage.

No No.2 system stoppage.

Remote controller indicates error, however,

remote controller operation is not possible other

than at stoppage. (No fan stoppage.)

Correct cause of error.

Communication error detected at No.1 and No.2

system indoor unit due to remote controller

error, and all systems stopped.

(1) Repair cable C

The outdoor unit for address 00 is no longer

connected to the system, and operation is not

possible as there is no power supply to the

remote controller, resulting in an error.

(1) Repair cable A.

[Emergency Repair]

(1) Set to the No.2 address and cut the power to

the No.1 outdoor unit. (single system

operation.) Change No.1 address to 01.

Error occurred at both No.2 system outdoor and

indoor unit and error occurs at remote controller.

Operation can be continued as no error has

occurred at system No.1, however, remote

controller operation is not possible other than at

stoppage. (No fan stoppage.)

(1) Repair cable B.

[Emergency Repair]

(1) Cut power to outdoor unit No.2.

Single system operation.

Communication error detected at No.2 system

indoor unit, however, no error reported at

remote controller when D breakage occurs.

Communication error detected at No.2 system

indoor unit, resulting in stoppage.

(1) Repair cable C

Error Details

Recommended Countermeasure

Prior to power ON to boot-up

Stoppage (power supplied)

During Operation

Cable A

breakage,

reverse

connection

Wiring Errors

Cable B

breakage,

reverse

connection

Cable C

breakage,

reverse

connection

Cable D

breakage,

reverse

connection

No.1 system

error

No.2 system

error

51F error

Refrigerant

Related Errors

No. 1 system indoor/outdoor unit transmission cable.

No. 2 system indoor/outdoor unit transmission cable.

Remote controller cable for board No.1 (communication of operation and control details).

Cable connecting No.1 and No.2 board (communication of operation and control details)

* Error countermeasures for PEH-16

·20

Remote controller

Indoor unit

No.2 board

Outdoor unit No.1

Address: 00

Outdoor unit No.2

Address: 01

No.1 board

Symptom and operation when normal

1. No remote controller display

2. Remote controller displays

“PLEASE WAIT” unchanged.

3. When remote controller operation

switch pressed, operation display
appears but immediately disap-
pears.

4. Does not beep and air conditioner

does not operate even when oper-
ated with wireless remote control-
ler.
(Operation display appears on wire-
less remote controller.)

5. When operated with wireless re-

mote controller, beeps but does not
operate.

6. Remote controller display is normal

and cooling operation is performed,
but without any capacity (does not
cool).

Cause

(1) DC14V is not supplied to remote con-

troller.
(No power O display on liquid crystal
panel.)

(2) DC14V is supplied to remote controller

but nothing is displayed.
- “PLEASE WAIT” not displayed
- “PLEASE WAIT ” displayed

(1) Remote controller displays

“PLEASE WAIT” for maximum of
2 minutes for starting after power
turned on.

(2) Indoor-remote controller communication

faulty.

(3) Outdoor-indoor communication faulty.

(1) Operation switch is disabled for approxi-

mately 30 seconds after function select
operation from remote controller is re-
leased.

(1) Wireless remote controller and indoor

controller board pair number setting mis-
matched.

(2) Cause of item 1.

(1) Air conditioner does not operate for a

maximum of 2 minutes after the power
is turned on.

(2) Set to local operation prohibit mode.

- Remote start/stop adapter is con-

nected to CN32 on indoor controller
board.

- Air conditioner is connected to

MELANS and is set to local operation
prohibit mode from centralized control-
ler, etc.

(3) Cause of item 2.

(1) Insufficient refrigerant.
(2) Filter clogged.
(3) Outdoor unit heat exchanger clogged.
(4) Air duct short cycle.
(5) Outdoor unit bypass circuit faulty.

Symptom judgment and remedy

(1) Check LED2 on indoor controller board.

1) Steady light

Check remote controller wire open or faulty
contact.

2) Flashing

Check for remote controller wire short.

3) Not lit

Check outdoor controller refrigerant address.

(2) Make the following judgment:

- When “PLEASE WAIT” is not displayed,

remote controller is faulty.

- When “PLEASE WAIT” is displayed, see

item 2.

(1) Normal operation.
(2) Remote controller self-diagnosis.
(3) When outdoor-indoor cannot communicate

“PLEASE WAIT” is displayed for a maximum
6 minutes.
Check LED3 on indoor controller board.

1) Does not flash

Check indoor/outdoor connection cable for
erroneous wiring.
(S1 and S2 or S3 open)

2) Flashes

Indoor/outdoor connection cable is normal.

(1) Normal operation.

(1) Check pair number setting.
(2) Item check of item 1.

(1) Normal operation.
(2) Normal operation.
(3) Item check of item 2.

(1) - When there is leakage, discharge tempera-

ture rises. Therefore, check by measuring
temperature.

- Check for gas leakage from piping connec-

tions, etc.

(2) Open intake grille and check filter. Clean filter,

and remove dust and dirt.

(3) - Since both indoor piping temperature and

outlet pressure rise when filter clogged, judge
by measuring outlet pressure.

- Clean heat exchanger.

(4) Remove obstruction.
(5) Check refrigerant circuit operation state.

Symptom and operation when normal

7. Remote controller display is normal

and heating operation is performed

but without any capacity (does no

heat).

Cause

(1) Insufficient refrigerant.
(2) Refrigerant piping heat insulation insuf-

ficient.

(3) Filter clogged.
(4) Indoor unit heat exchanger clogged.
(5) Air duct short cycle.
(6) Outdoor unit bypass circuit faulty.

Symptom judgment and remedy

(1) - Since the discharge temperature rises when

there is leakage, judge by measuring the tem-
perature.

- Check piping connections, etc. for gas leak-

age.

(2) Check heat insulation.
(3) Open intake grille and check filter.

Clean filter, and remove dust and dirt.

(4) - Since the indoor piping temperature and out-

let pressure rise when the heat exchanger is
clogged, judge by measuring the outlet pres-
sure.

- Clean heat exchanger.

(5) Remove obstruction.
(6) Check refrigerant circuit operation state.

Erroneous wiring contents

Remarks

Normal

wiring

Open

between S1

Open

between S2

Open

between S3

Remote control-

ler display

“ ” Power

supply mark

No display

Condition

Trial run

(relocation)

Trial run

relocation

Trial run

relocation

Trial run

relocation

Trial run

relocation

Trial run

relocation

Trial run

relocation

Trial run

relocation

Trial run

relocation

Indoor controller board

LED display

Outdoor controller

board LED display

(after 4 minutes)

LED1

Off

LED2

Off

LED3

Flashing

Off

Indoor

side

Indoor

side

Indoor

side

Indoor

side

Indoor

side

Indoor

side

Indoor

side

Indoor

side

Indoor

side

Outdoor
side

SIMPLE PARTS CHECK METHOD

Part name

Outdoor unit Fan motor

Thermal protector
trip
150

5˚

:open

11˚C :close

Judgment instructions

Disconnect the

the resistance value with a multimeter.

(Ambient

10 ˚C to 30 ˚C)

Measure the

value across the terminals with a multimeter. (Winding

20 ˚C)

Normal

Outdoor

unit

4.3 k

Ω

~9.6 k

Ω

160 k

Ω

~410 k

Ω

Abnormal

Open or short

(Based on

characteristic table)

White

Blue

Black

Normal

123

Ω

Abnormal

Open or short

Motor lead wire

Between 2 phases

Red

-20

-10

120

Res

Temperature

Thermistor Ro = 15 k

3 %

B constant = 3,460 k

2 %

Rt = 15 exp {3,460 (

–

)}

Ω

C: 3.1 k

Ω

273

Thermistor R120 = 7.465 k

2 %

B constant = 4,057 k

Ω

2 %

Rt = 7.465 exp {4,057 (

– ––––)}

C: 250 k

Ω

34 k

Ω

C: 160 k

Ω

24 k

Ω

C: 104 k

Ω

C: 17.5 k

Ω

100

48 k

Ω

110

C: 9.8 k

Ω

273

393

Thermistor <Discharge temperature detection> (TH2)

High temperature thermistor

Low temperature thermistor

Thermistor <Liquid temperature detection> (TH1)

Thermistor (TH1) <Liquid

temperature detection>

Thermistor (TH2)

<Discharge temperature

detection>

•Outdoor unit

TH1

TH2

Compressor

Measure the

value across the terminals with a multimeter. (Winding

temperature 25 ˚C)

Normal

Each phase

Abnormal

1.59

PUH-8

Open

short

1.23

PUH-10

Open or short

Heat exchanger

Pressure switch
63H1

Pressure switch
63H2

Accumulator

Capillary tube

Pressure switch
63L

Capillary tube

Check valve

Capillary tube
for cooling

Capillary tube

Liquid pipe thermistor
(TH1)

Detailed View of Section A

Solenoid valve coil
Solenoid valve

Strainer

4-way valve

4-way valve coil

Compressor

Crankcase
heater

Ball valve

Discharge
thermistor
(TH2)

Service port

Capillary tube
for cooling

• PUH-8, 10YKA

PARTS NAME

Main board

Magnetic contactor

for compressor (52C)

F.C. Board

Transformar (TR)

N.F. Board

Terminal block for defrosting signal

Terminal block
for outdoor/indoor comminication

Power source terminal block

Control box parts

OPTIONAL PARTS

Item

Individual order number

Remark

Outlet grill

PAC-SG208SG-E

2 pcs/pack

Pressure gauge

PAC-SK209PG-E

1 pcs/pack

M-NET adaptor

PAC-SF80MA-E

Issued in July.2007. No.HWE07040
Made in Japan.

New publication, effective July. 2007
Specifications subject to change without notice.

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

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