Mitsubishi Electronics PUHY-80TMU-A, 100TMU-A User Manual

AIR CONDITIONERS CITY MULTI Series Y

Models PUHY-80TMU-A, 100TMU-A

Service Handbook

Service Handbook PUHY-80TMU-A, 100TMU-A

- Inadequate connection and fastening may generate heat and
cause a fire.

• Prepare for typhoons and other strong winds and earth­quakes and install the unit at the specified place.

- Improper installation may cause the unit to topple and result in

injury.

• Always use an air cleaner, humidifier, electric heater, and
other accessories specified by Mitsubishi Electric.

- Ask an authorized technician to install the accessories. Im-

proper 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.

- 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, poison-

ous 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 “Electric 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 improperly, electric shock and fire may result.

• Securely install the cover of control box and the panel.

- If the cover and panel are 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

refrigerant (R22) specified on the unit.

- If a different refrigerant or air is mixed with the original refriger-

ant, the refrigerant 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 pre-

vent 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 de-

vice is shorted and operated forcibly, or parts other than those
specified by Mitsubishi Electric are used, fire or explosion may
result.

Before installation and electric work

ss

ss

s Before installing the unit, make sure you read all

the “Safety precautions”.

ss

ss

s The “Safety precautions” provide very important

points regarding safety. Make sure you follow
them.

ss

ss

s This equipment may have an adverse effect on

equipment on the same electrical supply system.

ss

ss

s Please report to or take consent by the supply au-

thority before connection to the system.

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.
: Indicates that caution should be taken with rotating parts.

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

: Indicates that the main switch must be turned off before

servicing. (This symbol is displayed on the main unit label.)
<Color: Blue>

: Beware of electric shock (This symbol is displayed on the

main unit label.) <Color: Yellow>

: Beware of hot surface (This symbol is displayed on the main

unit label.) <Color: Yellow>

ELV

: Please pay attention to electric shock because this

is not Safety Extra Low-Voltage (SELV) circuit.
And at servicing, please shut down the power supply

for both Indoor Unit and Outdoor Unit .

Warning:

Carefully read the labels affixed to the main 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 air 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.

Safety precautions

site, do not charge it with a refrigerant different from the

Contents

1 COMPONENT OF EQUIPMENT 1

[1] Appearance of Components 1
[2] Refirigerant Circuit Diagram and Thermal Sensor

Standard operation data

iger 6

[3] PUHY-80, 100TMU-A ELECTRICAL WIRING

DIAGRAM 7

9

[4]
[5] Function of dip SW and rotary SW 11

2 TEST RUN 15

[1] Before Test Run 15
[2] Test Run Method 19

3 GROUPING REGISTRATION OF INDOOR UNITS WITH

M-NET REMOTE CONTROLLER 20

4 CONTROL 26

[1] Control of Outdoor Unit 26
[2] Operation Flow Chart 31
[3] List of Major Component Functions 36
[4] Resistance of Temperature Sensor

Refrigerant Amount and Operating Characteristics

38

5 REFRIGERANT AMOUNT ADJUSTMENT 39

[1] 39
[2] Adjustment and Judgement of Refrigerant Amount 39

6 TROUBLESHOOTING 44

[1] Principal Parts 44
[2] Self-diagnosis and Countermeasures Depending on the

Check Code Displayed 62

[3] LED Monitor Display......................................................

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83

Propeller fan

Fan motor

-1-

Rear Controller Box

INV board

MAIN board

Choke coil(L2)

Interrigent Power Module(IPM)

Magnetic contactor(52C)

Capacitor (C1)(Smoothing capacitor)

Gate Amplifier board(G/A board)

Diode stack(DS)
Power board

Terminal block(TB7)Transmission

Terminal
block (TB3)
Transmission

Terminal
block (TB1)
Power source

-2-

MAIN board

CNS1 M-NET
Transmission (DC30V)

CNS2 M-NET Transmission
(Centralized control) (DC30V)

CN40 M-NET
Transmission
Power supply

CNVCC3 Power
source for contorl

1-2 DC30 V
1-3 DC30 V
4-6 DC12 V
5-6 DC5 V

CN51 Indication distance
3-4 Compressor ON/

Off

3-4 trouble

LD1
Service LED

CNRS53
Serial transmission to
INV board

CN3D

CN3S

CNFAN1
control
for MF1

CNAC3

CN20
power
source

SW1,2,3,4
Dip Switch

-3-

INV board

CNDC2
1-3 DC310 V

CN15V2
Power supply IPM control

1-2 DC15 V
5-6 DC15 V
9-0 DC15 V
C-D DC15 V

CNL2
Choke coil

CNRS2

Serial transmission

to MAIN board

CNAC2
Power source

1 L2
5 N

CNFAN

Control for

MF1

CN52C

Control for

52C

CNVCC2
power
supply

CNCT

CNVCC4

CNTH

CNDR2
IPM control
signal

SW1

-4-

G/A board

Power board

DC310V

CNDC1
1 - 3 DC310V

CN15V1
Power Supply
IPM control

1 - 2 DC15V
5 - 6 DC15V
9 - 0 DC15V
C - D DC15V

CNDR1
IPM control signal

-5-

[2] Refirigerant Circuit Diagram and Thermal Sensor

1 PUHY-80TMU-A, 100TMU-A

TH1

TH6

TH7

TH8

TH5

TH2

O/S

63HS

CJ1

Comp

HEXFHEXB

SCC

LEV1

ST7

BV2

ST2

Indoor

Unit

BV1

ST1

CJ2

CV1

ST6

SV1

CP1

SV2

SLEV

SA

MA

CP2

63H

High pressure safety valve

Accumulator

-6-

[3] PUHY-80, 100TMU-A ELECTRICAL WIRING DIAGRAM

CNS2

(3P)

FN3

FN2

1 2

C

CNS2

(3P)

FN3

FN2

C 1

R 1

52C

DCCT

1 2 3

TH6 TH5TH8TH7TH2 TH1 63HS

SW3-10 are OFF for Model 80.

and ON for Model 100.

Trouble

Compressor ON/OFF

Snow sensor

Compressor ON/OFF

Night mode

Ground

123451234

5

54321

32132

1

1 2 3 1 2 3 4 5 6 7 8

1 2

1 2 3

1 2

321

L1L2L3

+

DS(Diode stack)

Power source

3~208~230V

SLEV

CN20

(7P)

CN03

(3P)

CN02

(8P)

CN01

(2P)

CNH

(3P)

CNLV1

(5P)

Blue

CNLV2

(5P)

Red

CN51

(5P)

CN3D

(3P)

CN3S

(3P)

Red

CNS1

(2P)

CNS2

(3P)

T B 3

T B 7

A B

1 2 3 4

1 2 3 4

CN40

(4P)

CN41

(4P)

54321

Connect to

indoor and

remote

controller

GR

Red

Black

-

Red

12V

DSA

3 2 1

1 2

THHS

52

1234567123456

12345

CNRS3

(7P)

CNVCC3

(6P)

CNAC3

(5P)

GL3L1

Control circuit board

(MAIN-BOARD)

LD1

1

10

1

10

1

10

OFF ONOFF ONOFF ON

Unit address setting switch

X 0 1

A B Shield

G

L3

F2

6.3A

F1

6.3A

ZNR1~4

Red

CNFAN1

(5P)

Red

54321

CN38

(3P)

Green

CN34

(6P)

CN33

(6P)

CN32

(3P)

321

321

65432

1

65432

1

FN4

FN6

FN2

FN3

FN1

Noise filter board

(POWER-BOARD)

Red
White
Black
Green

Red
White
Black

F01

2A

R2

1 2 1 2

Green

CNTH

(2P)

CNL2

(2P)

Red

CN30V

(2P)

Red

CNFAN

(3P)

R2

U W

1 2 1 2

MF

L2

R2

F01

2A

12345

12345

6

CNVCC4

(2P)

1

2

CNAC2

(5P)

1234567

CNVCC2

(6P)

123

Red

Black

+

1 2 3 4

CNRS2

(7P)

CNCT

(4P)

(3P)

Yellow

CNDC1

(3P)

1 2 3 4

CN52C

CN15V1

(14P)

CNDR1

(9P)

CNDC2

(3P)

Yellow

CNDR2

(9P)

CN15V2

(14P)

Power circuit board

(INV-BOARD)

Black

White

Red

Gate amp board

(G/A-BOARD)

1 2 3

1 2 3 4 5 6 7 8 9 10 11 12 13 14

1 2 3

1 2 3

1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8 9 10 11 12 13 14

1 2 3 4 5 6 7 8 9

U V W

F01

3.15A

21

S4

SV

CNVCC5

(2P)

1

2

1

2

GL3L1

Detection

Circuit

ONOFF

10

1

2

CNE

(2P)

1

L2 L1

Ground

X01

N

P

DCL

V

LEV1

SW1SW2SW3SW4

SWU1SWU2

X04

X05

X02

63H

MF

CH1

SV1

60Hz

TB1

MC

2

IPM

1

1357

1 2 3

-7-

S W U 1 ~ 2

T B 1

Switch unit address set

Terminal block power source

T B 3

T B 7

Terminal block transmisson

GR

Ground terminal

Terminal block transmisson

centralized control

L D 1

S W 1

S W 2 ~4

Switch function selection

Switch display selection self-diagnosis

Luminous diode

T H 8

bypass outlet temp.

detect at Sub-cool coil

T H H S

Rediator panel temp.detect

6 3 H S

High pressure sensor

S L E V

L E V 1

Electronic expansion valve

(Oil return)

Electronic expansion valve

(Sub-cool coil bypass)

L 2

Choke coil(Transmission)

T H 7

liquid outlet temp.

detect at Sub-cool coil

T H 5

T H 2

T H 1

pipe temp.detect

T H 6

OA temp.detect

saturation

evapo.temp.detect

Thermistor

Thermistor

6 3 H

High pressure switch

S V 1 , S V 2

Solenoid valve

(Discharge-suction bypass)

C H 1

Crankcase heater (Compressor)

D S A

Surge absorber

Motor Compressor

Motor Fan Heat exchanger

Motor Fan Radiator panel

M F 1

M F

M C

5 2 C

Magnetic contactor

(Inverter main circuit)

Z N R 1 ~ 4

Varistor

C 1

Capacitor Smoothing

Resistor rush current protect

D C C T

Current Sensor

R 1

R 2

Resistor power regulation

D C L

DC reactor

(Power factor improvement)

I P M

Intelligent Power Module

D S

Diode stack

Symbol

Name

Symbol

Name

Symbol

Name

Symbol

Name

discharge pipe temp.detect

4-way valve

2 1 S 4

OFF : 0

ON : 1

(at factory shipment)

FLAG7

FLAG1

FLAG6

Display

Relay output

display

(Lighting)

During

compressor

run

Crankcase

heater

0000~9999

Display the address and error codes by turns

21S4

SV1 SV2

Check display

(Blinking)

Display at LED lighting (blinking) Remarks SW1 operation

FLAG3 FLAG4FLAG2 FLAG5

FLAG8

FLAG8 always lights at

microcomputer power ON

Always

lighting

<Operation of self-diagnosis switch (SW1) and LED display>

<LED display>

LD1

FLAG8

FLAG7

FLAG6

FLAG5

FLAG4

FLAG3

FLAG2

FLAG1

1 2 3 4 5 6 7 8 9 10

-8-

[4] Standard operation data

1 Cooling operation

75 81

111 157

Discharge (TH1)
Heat exchanger outlet (TH5)

Inlet

Accumulator

Outlet

Suction (Comp)
low pressure saturation

temperature (TH2)
Shell bottom (Comp)

SCC outlet (TH7)
Bypass outlet (TH8)
LEV inlet
Heat exchanger outlet

Outdoor units

Items

Condition

Pressure

LEV opening

Sectional temperature

Indoor
Outdoor
Quantity
Quantity in operation
Model
Main pipe
Branch pipe
Total piping length

Ambient temp.

Indoor unit

Piping

Indoor unit fan notch
Refrigerant volume

Outdoor unit

Compressor volts/Frequency

Indoor unit
SC (LEV1)
Oil return (SLEV)

DB/WB

Set

–

m

(Ft)

PUHY-80TMU-A PUHY-100TMU-A

–

kg(oz)

A

V

V/Hz

Pulse

Outdoor
unit

85(185) 95(203)
40(104) 42(108)

7(45) 5(41)

9(48) 7(45)
7(45) 10(50)
6(43) 4(39)

60(140) 60(140)

27(81) 27(81)

8(46) 6(43)

26(79) 26(79)

10(50) 10(50)

2.00/0.50
(290/72)

1.99/0.46
(288/67)

°C

(°F)

MPa(psi)

High pressure/Low pressure
(after O/S) (before MA)

Indoor
unit

24 24 20 10 48 16 24 10

5(16.4) 5(16.4) 5(16.4) 5(16.4) 5(16.4) 5(16.4) 5(16.4) 5(16.4)

Hi Hi Hi Hi Hi Hi Hi Hi

440 440 380 300 450 320 440 300

26.7°C(80°F)/19.4°C(67°F)
35°C(95°F)

4
4

4
4

5(16.4) 5(16.4)

25(82) 25(82)

10.2(360) 12.5(441)

27.4

208

134/76

230

134/76

208

171/98

230

171/98

24.8 35.2 31.8

-9-

00

87 111

Discharge (TH1)
Heat exchanger inlet (TH5)

Inlet

Accumulator

Outlet

Suction (Comp)
low pressure saturation

temperature (TH2)
Shell bottom (Comp)

Heat exchanger inlet
LEV inlet

2 Heating operation

Outdoor units

Items

Condition

Pressure

LEV opening

Sectional temperature

Indoor
Outdoor
Quantity
Quantity in operation
Model
Main pipe
Branch pipe
Total piping length

Ambient temp.

Indoor unit

Piping

Indoor unit fan notch
Refrigerant volume

Outdoor unit

Compressor volts/Frequency

Indoor unit
SC (LEV1)
Oil return (SLEV)

DB/WB

Set

–

m

PUHY-200TM-A PUHY-250TM-A

27.5

208

149/85

24.9

230

149/85

35.6

208

174/100

32.2

230

174/100

–

kg

A

V

V/Hz

Pulse

80

85(185)

6(46) 8(46)

–1(30) –2(28)
–1(30) –2(28)
–1(30) –2(28)
–2(28) –2(28)

35(95) 44(111)

71(160) 71(160)

33(91) 33(91)

1.72/0.36
(249/52)

1.72/0.36
(249/52)

MPa(psi)

High pressure/Low pressure
(after O/S) (before MA)

°C

(°F)

Outdoor
unit

Indoor
unit

24 24 20 10 48 16 24 10

5(16.4) 5(16.4)5(16.4)5(16.4)5(16.4)5(16.4)5(16.4)5(16.4)

Hi Hi Hi Hi Hi Hi Hi Hi

510 510 450 300 350 380 510 300

21.1°C(70°F)

8.3°C(47°F)/6.1°C(43°F)
4
4

4
4

5(16.4) 5(16.4)

25(82) 25(82)

10.2(360) 12.5(441)

-10-

[5] Function of dip SW and rotary SW

(1) Outdoor unit

Switch Function

Function According to Switch Operation Switch Set Timing

When Off When On When Off When On
Unit Address Setting
For self diagnosis/
operation monitoring

–
Centralized Control
Switch
Deletion of connection
information.

Deletion of error history.

Adjustment of
Refrigerant Volume

–
Disregard ambient air
sensor errors, fluid
overflow errors.
Forced defrosting

Defrost prohibited timer

–

–
SW3-2 Function Valid/
Invalid
Indoor Unit Test
Operation
Defrosting start
temperature of TH5.
Defrosting end
temperature of TH5.
Opening angle of IC
except when heater
thermostat is ON during
defrosting.

–

–

Target Pd (High pressure)

–

–

–

–

–

–

–

–

–

–

–
–

–
–

–
–

–

–

–
–

–
–

–
–

–

–

–
–

–
–

–
–

–

–

Models

LED Display "°F" "psig" Display "°C" "kgf/cmG "Display When switching on the power

Fan characteristics
( )

Standard High external

static pressure

When switching on the power

–
Centralized control not
connected.
Storing of refrigeration
system connection
information.

–

Ordinary control

–
Errors valid.

Ordinary control

50 min.

–

–
SW3-2 Function Invalid

Stop all indoor units.

-2°C

(28.4°F) (32°F)

8HP: 12°C(53.6°F)

10HP: 8°C(46.4°F)

(no operation)

–

–

18kg/cm

2

G

(256psi)

20kg/cm2G

(284psi)
–
–

Model 80

Set on 00 or 51~100 with the dial switch. (

✻

2)

LED Monitering Display

–
Centralized control
connected.
Deletion of refrigeration
system connection
information.
Deletion

Refrigerant volume
adjustment operation.

–
Disregard errors.

Start forced defrosting.

90 min.

–

–
SW3-2 Function Valid

All indoor units test
operation ON.

0°C

15

(59°F)

°C

2000

–

–

–

–
Model 100

During normal
operation when
power is on.

Before power is turned on.
During normal operation when
power is on.
Should be set on OFF.
Before power is turned on.

Before power is turned on.

During normal operation when
power is on.

–
During normal operation when
power is on.

During normal operation when
power is on. (Except during
defrosting)

–

–
During normal operation when
power is on.
When SW3-1 is ON after power is
turned on.
During normal operation when
power is on.
During normal operation when
power is on. (Except during
defrosting)

–
When switching on the power.
During normal operation when
power is on.

–

–
When switching on the power.

Invalid 2 hours
after compressor
starts.

During normal
operation when
power is on.

10 minutes or
more after
compressor
starts.

Note:

1. SWU1~2=00 when shipped from the factory. Other factory settings are indicated by shaded portions.

✻

1

2. If the address is set from 01 to 50, it automatically becomes 100.

SWU

SW1

SW2

SW3

SW4

1~2
1~8

9~10

1

2

3

4

5
6

7

8

9

10

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

10

-11-

2. SW4-9 setting

Fan characteristics curve:DIPSW4-7ON,230V/60Hz

Fan characteristics curve:DIPSW4-7ON,208V/60Hz

0

5

10

15

20

25

30

35

40

45

50

150 160 180 190 200 210 220 230 240

Standard Airflow rate

200(m

3

/min)

Fan characteristics curve:DIPSW4-7OFF[FactorySetting],208V•230V/60Hz

Continuous operation range

Airflow rate (m3/min)

External static pressure (Pa)

170

-12-

(2) Indoor unit

DIP SW1, 3

Model 32 40 48
Capacity (model name) code

16 20 25

SW2 setting

Model 08 10 12 16 20 24
Capacity (model name) code

45 681013

SW2 setting

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

Note 1: The shaded part indicates the setting at factory shipment. (For the SW not being shaded, refer to the

table below.)

2: The DipSW setting is only effective during unit stopping (remote controller OFF) for SW1, 2, 3 and 4 commonly

and the power source is not required to reset.)

3: When both SW1-7 and SW1-8 are being set to ON, the fan stops at the heating thermostat of OFF.

Setting of DIP SW2

Model

Switch

SW1

SW3

3
6
7
3
4
6
8

PLFY-NAMU-A

ON
ON

OFF

ON

ON
OFF
OFF

Indoor unit inlet

None

100h

Ineffective
Fan output display
At stationary heating

Very low speed

SW1-7 setting

Ineffective

–

Heat pump

None

None
None

1st setting

Down blow B, C

–

Effective

–
–

Built in remote controller

Provided

2500h

Effective

Thermo. ON signal display

Always at heat.

Low speed

Set airflow

Effective

–

Cool.only

Provided

Provided
Provided

2nd setting

Horizontal

–

Ineffective

–
–

Room temp. sensor position
Clogged filter detect.
Filter duration
OA intake
Remote display select.
Humidifier control
Heating thermo. OFF airflow
Heating thermo. OFF airflow
Power failure automatic

return

–

Model selection

Louver

Vane
Vane swing function
Vane horizontal angle
Vane angle set for cooling

–

Heating 4deg (7.2 deg) up
Note : °C scale (°F scale)

–
–

Always ineffective for PKFY-NAMU

Not provided for PKFY-NAMU
Provided for PLFY-NGMU (ON) setting

Always down blow B,C for
PKFY-NAMU

SW1

SW3

1
2
3
4
5
6
7
8

9

10

1

2

3
4
5
6
7

8
9

10

Switch SW name

Operation by SW

Switch set timing

OFF ON OFF ON

Remarks

At unit stopping

(at remote

controller OFF)

Cooling capacity saving

for PKFY-NAMU,
effective/ineffective

PDFY-NMU-A

ON

ON
OFF
OFF
OFF
OFF
OFF

PKFY

OFF
OFF
OFF

ON

OFF
OFF

NAMU-A NGMU-A

OFF ON

-13-

Setting of DIP SW4 Setting of DIP SW5

1234

ON OFF ON OFF

OFF OFF OFF ON

ON OFF OFF ON

OFF OFF ON ON

––––

OFF OFF ON –

PDFY-10 ~ 32
PLFY-12 ~ 24
PLFY-32 ~ 48
PKFY-P-8
PKFY-P-12
PDFY-40, 48

Model Circuit board used

SW4

Phase control

Relay selection

✻

✻

✻

-14-

TEST RUN

[1] Before Test Run

(1) Check points before test run

1 Neither refrigerant leak nor loose power source/ transmission lines should be found, if found correct immediately.

2 Confirm that the resistance between the power source terminal block and the ground exceeds 2MΩ by measur-

ing it with a DC500V megger. Do not run if it is lower than 2MΩ.
Note : Never apply the megger to the MAIN board. If applied, the MAIN board will be broken.

3 Confirm that the Ball valve at both gas and liquid sides are fully opened.

Note : Close the cap.

4 Be sure that the crankcase heater has been powered by turning the main power source on at least 12 hours

before starting the test run. The shorter powering time causes compressor trouble.

(2) Caution at inverter check

Because the inverter power portion in outdoor unit electrical part box have a lot of high voltage portion, be sure to follow
the instructions shown below.

During energizing power source, never touch inverter power portion because high voltage (approx. 320V) is
applied to inverter power portion.

When checking,

Shut off main power source, and check it with tester, etc.

Allow 10 minutes after shutting off main power source.

Open the MAIN board mounting panel, and check whether voltage of both ends of electrolytic capacitor is
20V or less.

1

2

1

2

3

2

-15-

(3) Check points for test run when mounting options

(4) Attention for mounting drain water pump mechanism

Check point

Local remote controller displays code
No. “2503”, and the mechanism stops.

No overflow from drain pan.
Drain water comes out by operation of

drain pump.
Sound of pump operations is heard, and

drain water comes out.
No water leak from connecting portions

of each water piping.
Water is supplied to water supply tank,

and float switch is operating.

Built-in optional parts
Mounting of drain

water pump
mechanism

Mounting of perme­able film humidifier

Content of test run

Release connector of pump circuit,
check error detection by pouring
water into drain pan water inlet.

After that, connect connector of
circuit.

Check pump operations and drain­age status in cooling (test run) mode.

Check humidifier operations and water
supply status in heating (test run) mode.

1

2

3

4

5

Result

1

2

3

Work

Disassembling and
assembling of drain
water pump
mechanism

Mounting of float
switch

Electric wiring

Float switch moves smoothly .
Float switch is mounted on

mounting board straight without
deformation.

Float switch does not contact the

copper pipe.
Wiring procedure is exactly followed.
Connector portion is tightly hooked.

Content of test run

Lead wire from control box not
damaged.

Rubber cap properly inserted in to
drain water outlet of drain pan?

Insulation pipe of gas and liquid
pipes dealt with as shown on next
page?

Drain pan and piping cover mounted
without gap?

Drain pan hooked on cut projection
of the mechanism?

Float switch installed without contacting the
drain pan?

No mistakes in wiring?
Connectors connected securely and

tightly?
No tension on lead wire when sliding

control box?

1
2

3

1

2

3

Check point Result

Insulation pipe

No gap

-16-

Trouble

Not operate.

Not cool (at cooling).
Not heat (at heating).

Not cool, not heat, error stop.
Condensation drip in piping.
Not cool, not heat, error stop.

Water leak, condensation drip in drain piping.

Error stop, not operate.

Electric shock.
Error stop, not operate.

Classification

Installation and
piping

Power source
wiring

Portion

1

2

3

Check item

Instruction for selecting combination of outdoor unit,
and indoor unit followed? (Maximum number of indoor
units which can be connected, connecting model name,
and total capacity.)

Follow limitation of refrigerant piping length? For example,
70m (229ft) or less (total length : 220m (721ft)) at the farthest.

Connecting piping size of branch piping correct?
Refrigerant piping diameter correct?
Refrigerant leak generated at connection?
Insulation work for piping properly done?
Specified amount of refrigerant replenished?

Pitch and insulation work for drain piping properly done?
Specified switch capacity and wiring diameter of main

power source used?

Proper grounding work done on outdoor unit?
The phases of the L line (L1, L2, L3) correct?

1

2

3

4

5

6

7

8

(5) Check points for system structure

Check points from installation work to test run.

-17-

Classification
Transmission

line

Portion

1

2

3

4

5

6

7

8

Check item

Limitation of transmission line length followed? For example,
200m (656ft) or less (total length : 500m (1640ft)) at the farthest.

1.25mm2 (AWG16) or more transmission line used?
(Remote controller 10m (32ft) or less 1.25mm2 (AWG16))

2-core cable used for transmission line?

Transmission line apart from power source line by 5cm (2in) or more?
One refrigerant system per transmission line?
The short circuit connector is changed form CN41 to

CN40 on the MAIN board when the system is centralized
control? (Just one outdoor unit. Not all outdoor units.)

• No connection trouble in transmission line?
Connection of wrong remote controller line terminals?

• MA Remote controller : TB15

• M-NET Remote controller : TB5

Trouble

Erroneous operation, error stop.

Erroneous operation, error stop.

Error stop in case multiple-core
cable is used.

Erroneous operation, error stop.
Not operate.
Not operate.

Error stop or not operate.
Never finish the initial mode.

System set

Before starting

Error stop or not operate.

Can not be properly set with power
source turned on.

Not operate.
Set temperature not obtained at

heating operations (Thermostat
stop is difficult)

Error stop.

Error stop, compressor trouble.

1

2

1

2
3

4

Address setting properly done? (M-NET Remote
controller, indoor unit and outdoor unit.)

Setting of address No. done when shutting off power
source?

Address numbers not duplicated?
Turned on SW3-8 on indoor unit circuit board when

mounting room thermistor sensor?

Refrigerant piping ball valve (Liquid pressure pipe, gas
pressure pipe) opened?

Turn on power source 12 hours before starting operations?

2 31

SET TEMP. ON/OFF

PAR-F27MEA-US

FILTER

CHECK TEST

CLOCK ON OFF

MODE

DRY COOL

DAILY

TIMER

CHECK

AUTO

ONCLOCK

SET TEMP.

REMAINDER

NOT AVAILABLE

SENSOR

INSIDE
FILTER

TEST RUN

VENTILATION

EROR CODE

AUTO

OFF

CENTRALLY CONTROLLED

AUTO FAN

HEAT

STAND BY
DEFROST

FAN
SPEED

TIMER FAN SPEED

LOUVER VENTILATION

AIR DIRECTION

TIMER SET

-18-

CENTRALLY CONTROLLED

DRY COOL

TIMER

DAILY

AUTO FAN

STAND BY
DEFROST

PAR-F27MEA-US

AUTO

SET TEMP.

REMAINDER

CHECK

HEAT

EROR CODE

SET TEMP. ON/OFF

CLOCK ON OFF

MODE

TIMER FAN SPEED

TIMER SET

AUTO

ONCLOCK

OFF

FAN
SPEED

VENTILATION

NOT AVAILABLE

AIR DIRECTION

LOUVER VENTILATION

SENSOR

TEST RUN

INSIDE
FILTER

CHECK TEST

FILTER

[2] Test Run Method

Operation procedure

Turn on universal power supply at least 12 hours before starting → Displaying “HO” on display panel for about two
minutes

Press

TEST

1

2

3

4

5

6

7

8

9

button twice → Displaying “TEST RUN’’ on display panel

Press

MODE

button → Make sure that air is blowing out

Press

MODE

button to change from cooling to heating operation, and vice versa Make sure that warm or cold

air is blowing out

Press

FAN SPEED

adjust button → Make sure that air blow is changed

Press

AIR DIRECTION

or

LOUVER

ON/OFF

button to change direction of air blowing make sure that horizontal or

downward blow is adjustable.

Make sure that indoor unit fans operate normally
Make sure that interlocking devices such as ventilator operate normally if any

Press button to cancel test run → Stop operation

Note 1: If check code is displayed on remote controller or remote controller does not operate normally.

2: Test run automatically stops operating after two hours by activation of timer set to two hours.
3: During test run, test run remaining time is displayed on time display section.
4: During test run, temperature of liquid pipe in indoor unit is displayed on remote controller room temperature

display section.

5: When pressing

FAN SPEED

adjust button, depending on the model, “NOT A V AILABLE” may be displayed on

remote controller. However, it is not a malfunction.

6: When pressing

AIR DIRECTION

or

LOUVER

button, depending on the model, “NOT A V AILABLE” may be

displayed on remote controller. However, it is not a malfunction.

-19-

3

GROUPING REGISTRATION OF INDOOR UNITS WITH M-NET REMOTE CONTROLLER

(1) Switch function

• The switch operation to register with the remote controller is shown below:

Registration/
ordinary mode
selector switch

Registration/ordinary
mode selection switch

Switch to assign indoor
unit address

Registration switch

Confirmation switch

Delete switch

Registered mode
selector switch

Switch to assign
interlocked unit address

+

This switch selects the ordinary mode or registered mode (ordinary
mode represents that to operate indoor units).

✻

To select the registered mode, press the

FILTER

+

LOUVER

button continuously for over 2 seconds under stopping state.
[Note] The registered mode can not be obtained for a while after
powering.
Pressing the

FILTER

+

LOUVER

button displays “CENTRALLY

CONTROLLED”.
This button assigns the unit address for “INDOOR UNIT ADDRESS

NO.”

This button is used for group/interlocked registration.

This button is used to retrieve/identify the content of group and
interlocked (connection information) registered.

This button is used to retrieve/identify the content of group and
interlocked (connection information) registered.

This button selects the case to register indoor units as group (group
setting mode) or that as interlocked (interlocked setting mode).

✻

The unit address is shown at one spot for the group setting mode

while at two spots for the interlocked setting mode.

This button assigns the unit address of “OA UNIT ADDRESS NO.”

Symbol

of switch

Registered mode
selector switch

Confirmation switch

Switch to assign
indoor unit address

Switch to assign inter-

locked unit address

Registration switch

+

FILTER

TEST RUN

Name Name of actual switch Description

of TEMP

CLOCK→
ON→OFF

of TIMER SET

Registration/
ordinary mode
selector switch

SET TEMP. ON/OFF

PAR-F27MEA-US

FILTER

CHECK TEST

CLOCK ON OFF

MODE

DRY COOL

DAILY

TIMER

CHECK

AUTO

ONCLOCK

SET TEMP .

REMAINDER

NOT AV AILABLE

SENSOR

INSIDE
FILTER

TEST RUN

VENTILATION

EROR CODE

AUTO

OFF

CENTRALLY CONTROLLED

AUTO FAN

HEAT

STAND BY
DEFROST

FAN
SPEED

TIMER FAN SPEED

LOUVER VENTILATION

AIR DIRECTION

TIMER SET

Delete switch

LOUVER

TIMER

MODE

A

A

B

B

F

F

G

G

E

E

D

D

C

C

H

H

ii

i

-20-

(2) Attribute display of unit

• At the group registration and the confirmation/deletion of registration/connection information, the type (attribute) of the
unit is displayed with two English characters.

Display Type (Attribute) of unit/controller

Indoor unit connectable to remote controller
Outdoor unit

Local remote controller
System controller (MJ)

[Description of registration/deletion/retrieval]

• The items of operation to be performed by the remote controller are given below. Please see the relating paragraph for
detail.

Group registration of indoor unit

• The group of the indoor units and operating remote controller is registered.

• It is usually used for the group operation of indoor units with different refrigerant system.

Retrieval/identification of group registration information of indoor units

• The address of the registered indoor units in group is retrieved (identified).

Retrieval/identification of registration information

• The connection information of any unit (indoor/outdoor units, remote controller or the like) is retrieved (identified).

Deletion of group registration information of indoor units

• The registration of the indoor units under group registration is released (deleted).

Deletion of the address not existing

• This operation is to be conducted when “6607” error (No ACK error) is displayed on the remote controller caused by
the miss setting at test run, or due to the old memory remained at the alteration/modification of the group composi­tion.

Caution:

When MELANS (G-50 for example) is being connected, do not conduct the group/pair registration using
the remote controller. The group/pair registration should be conducted by MELANS. (For detail, refer to the instruc­tion exclusively prepared for MELANS.)

1

2

3

4

5

-21-

(3) Group registration of indoor unit

1) Registration method

• Group registration of indoor unit ........................................................................

The indoor unit to be controlled by a remote controller is registered on the remote controller.

[Registration procedure]

With the remote controller under stopping or at the display of “HO”, continuously press the

FILTER

+

LOUVER

button
( + ) at the same time for 2 seconds to change to the registration mode. (See the figure below.)
Assign the indoor unit address to “INDOOR UNIT ADDRESS NO.” by operating the (Room temperature
adjustment) ( ).
Then press the

TEST RUN

button ( ) to register. In the figure below , the “INDOOR UNIT ADDRESS NO.” is being set
to 001.
After completing the registration, press the

FILTER

+

LOUVER

button ( + ) at the same time for 2 seconds to

change to the original ordinary mode (with the remote controller under stopping).

• Remote controller under stopping • “HO” under displaying

Ordinary mode

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

˚C

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

˚C

ERROR CODE
OA UNIT ADDRESS NO

˚C

Group setting mode

• Confirm the indoor unit address No.

• Confirm the connection of the transmission line.

ERROR CODE
OA UNIT ADDRESS NO

˚C

ERROR CODE
OA UNIT ADDRESS NO

˚C

• Registration complete

• Registration error

Indicates the type of unit
(Indoor unit in this case)

“88” flickers indicating registra­tion error. (when the indoor unit
registered is not existing)

Assign the
address ( )

Change to the
registration
mode ( + )

Press the
registration
switch ( )

Remote controller

Indoor units

Group

+

1

AB

AB

C

D

1

2

3

1

1

23

1

C

D

AB

23

System example

-22-

2) Method of retrieval/confirmation

2

1

2

• Retrieval/confirmation of group registration information on indoor unit...............

The address of the indoor unit being registered on the remote controller is displayed.

[Operation procedure]

With the remote controller under stopping or at the display of “HO”, continuously press the

FILTER

+

LOUVER

button

( + ) at the same time for 2 seconds to change to the registration mode.

In order to confirm the indoor unit address already registered, press

TIMER

button ( ). (See figure below.) When the

group of plural sets is registered, the addresses will be displayed in order at each pressing of

TIMER

button ( ).

After completing the registration, continuously press the

FILTER

+

LOUVER

button ( + ) at the same time for 2

seconds to change to the original ordinary mode (with the remote controller under stopping).

• Retrieval/confirmation of registration information ................................................

The registered information on a certain unit (indoor unit, outdoor unit, remote controller or the like) is displayed.

[Operation procedure]

With the remote controller under stopping or at the display of “HO”, continuously press the

FILTER

+

LOUVER

button

( + ) at the same time for 2 seconds to change to the registration mode.

Operate

MODE

button ( ) for the interlocked setting mode. (See figure below.)

Assign the unit address of which registration information is desired to confirm with the (TIMER SET) switch

( ). Then press the

TIMER

button ( ) to display it on the remote controller. (See figure below.)

Each pressing of

TIMER

button ( ) changes the display of registered content. (See figure below.)

After completing the retrieval/confirmation, continuously press the

FILTER

+

LOUVER

button ( + ) at the same

time for 2 seconds to change to the original ordinary mode (with the remote controller under stopping).

• Registered

• No registration.

ERROR CODE
OA UNIT ADDRESS NO

˚C

ERROR CODE
OA UNIT ADDRESS NO

˚C

Press the switch for confirmation ( )

Note: Only one address will be displayed

when the registration is one even the
switch is how often pressed

Indicates the type of unit
(Indoor unit in this case)

SET TEMP . ON/OFF

PAR-F27MEA-US

FILTER

CHECK TEST

CLOCK ON OFF

MODE TIMER FAN SPEED

LOUVER VENTILATION

AIR DIRECTION

TIMER SET

3

AB

E

E

A

1

1

1

AB

G

HE

AB

E

2
3

4

E

3

B

-23-

3) Method of deletion

• Deletion of group registration information of indoor unit ......................................

[Operation procedure]

With the remote controller under stopping or at the display of “HO”, continuously press the

FILTER

+

LOUVER

button ( + ) at the same time for 2 seconds to change to the registration mode.
Press the

TIMER

button ( ) to display the indoor unit address registered. (As same as )

In order to delete the registered indoor unit being displayed on the remote controller , press the

CLOCK →→ON OFF

TIMER

( ) button two times continuously. At completion of the deletion, the attribute display section will be shown as “ – – “.
(See figure below.)
Note: Completing the deletion of all indoor units registered on the remote controller returns to “HO” display.
After completing the registration, continuously press the

FILTER

+

LOUVER

button ( + ) at the same time for 2

seconds to change to the original ordinary mode (with the remote controller under stopping).

ERROR CODE
OA UNIT ADDRESS NO

˚C

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

˚C

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

˚C

Set the address

Press the switch for
confirmation ( )

• Registered

• No registration

* Same display will appear when

the unit of “007” is not existing.

twice continuously.

• Deletion completed

• Deletion completed

In case of group re­gistration with other
indoor unit is existing

In case of no group
registration with other
indoor unit is existing

+

“– –” indicates the
deletion completed.

ßC

ßC

(Alternative

display)

ßC

ßC

(Alternative

display)

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

˚C

SET TEMP . ON/OFF

PAR-F27MEA-US

FILTER

CHECK TEST

CLOCK ON OFF

MODE TIMER FAN SPEED

LOUVER VENTILATION

AIR DIRECTION

TIMER SET

SET TEMP . ON/OFF

PAR-F27MEA-US

FILTER

CHECK TEST

CLOCK ON OFF

MODE TIMER FAN SPEED

LOUVER VENTILATION

AIR DIRECTION

TIMER SET

21

1

1

1

1

AFB

AB

E

2

3

4

12

4

2

2

E

Press the switch for confirmation (

E

)

-24-

4) Deletion of information on address not existing

• Deletion of information on address not existing ...................................................

This operation is to be conducted when “6607” error (No ACK error) is displayed on the remote controller caused by
the miss setting at test run, or due to the old memory remained at the alteration/modification of group composition,
and the address not existing will be deleted.
Note: The connection information (connection between indoor unit and outdoor unit) on the refrigerant system can

not be deleted.
An example to delete the system controller of “250” from the indoor unit of “007” is shown below .

[Operation procedure]

With the remote controller under stopping or at the display of “HO”, continuously press the

FILTER

+

LOUVER

button
( + ) at the same time for 2 seconds to change to the registration mode.
Operate

MODE

button ( ) for the interlocked setting mode ( ii ). (See the figure below.)

Assign the unit address existing to “OA UNIT ADDRESS No.” with the (TIMER SET) switch ( ), and press

TIMER

button ( ) to call the address to be deleted. (See the figure below.) As the error display on the remote controller
is usually transmitted from the indoor unit, “OA UNIT ADDRESS No.” is used as the address of the indoor unit.
Press the

CLOCK →→ON OFF

TIMER

button ( ) twice. (See the figure below.)

After completing the deletion, continuously press the

FILTER

+

LOUVER

button ( + ) at the same time for 2

seconds to return to the original ordinary mode (with the remote controller under stopping).

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

ßC

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

ßC

(Alternative

display)

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

ßC

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

ßC

(Alternative

display)

✻

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

ßC

INDOOR UNIT
ADDRESS NO

ERROR CODE
OA UNIT ADDRESS NO

ßC

(Alternative

display)

✻

When both indoor
unit and interlocked
unit addresses are
existing

Deletion of
address not
existing

Set the address ( )

Press the deletion switch ( ) twice

• Deletion completed

• Deletion completed

+

Press the switch for
confirmation ( )

SET TEMP . ON/OFF

PAR-F27MEA-US

FILTER

CHECK TEST

CLOCK ON OFF

MODE TIMER FAN SPEED

LOUVER VENTILATION

AIR DIRECTION

TIMER SET

5

1

AB

AB

G

E

F

H

2
3

3

3

1

1

2

E

3 F

H

2

4

5

-25-

4

CONTROL

[1] Control of Outdoor Unit

(1) Initial processing

• When turning on power source, initial processing of microcomputer is given top priority.

• During initial processing, control processing corresponding to operation signal is suspended. The control processing
is resumed after initial processing is completed. (Initial processing : Data processing in microcomputer and initial
setting of each LEV opening, requiring approx. 2 minutes at the maximum.)

(2) Control at staring

• In case unit is started within 2 hours after turning on power source at low outdoor air temperature (+5˚C (41°F) or
less), the unit does not start operating for 30 minutes at the maximum .

(3) Bypass, capacity control

• Solenoid valve consists of bypass solenoid valve (SV1, SV2) bypassing between high pressure side and low pres­sure side. The following operation will be provided.

1) Bypass solenoid valves SV1 and SV2 (both "open" when turned on)
SV1

ON (Open) OFF (Close)

Turned on for 4 minutes
Turned on for 2 minutes

Always turned on

Turned on for 3 minutes

Always turned on

Always turned on in oil recovery
operation after low frequency
continuous operations



When Pd reaches When Pd is

27.5kg/cm

2

G

24kg/cm2G (341psi) or

(391psi) or more less 30 seconds





Item

When starting compressor
After thermost "ON is returned

and after 3 minutes restart
When compressor stops in

cooling or heating mode
After operation stops
During defrosting operations

(See figure below

✻

1)

During oil recovery operations

During 20Hz operations, at fall
in low pressure saturation
temperature. (ET) (3 minutes or
more after starting)

When high pressure rises (Pd)

When high pressure rises (Pd)
during 20Hz operations
(3 minutes after starting)

When discharge temperature
rises
(3 minutes after starting)

✻

Ex. SV1

When low pressure
saturation temp.
(ET) is -15˚C (5°F) or
more

When Pd is 23kg/
cm

2

G (327psi) or less

after 30 seconds
When high pressure

(Pd) is 20kg/cm

2

G

(284psi) or less
When discharge

temp. is 115˚C
(239°F) or less

SV2











OFF (Close)

ON (Open)

When low pressure
saturation temp. (ET)
is -30˚C (-22°F) or less

When Pd reaches

26kg/cm

2

G (370psi)

or more

Turned on when high
pressure (Pd) ex­ceeds pressure limit

When temp. exceeds
130˚C (266°F) and Pd reaches
15kg/cm2G (213psi) or more

Start

Thermo.
OFF

Thermo.
ON

(4-minute)

(3-minute)

Stop

Bypass
solenoid
valve
(SV1)

Compressor

(2-minute)

(4-minute)

Defrost­ing time
(*1)

-26-

–30–

(4) Frequency control

• Depending on capacity required, capacity control change and frequency change are performed to keep constant
evaporation temperature (0˚C) in cooling operations, and high pressure (18kg/cm

2

G) in heating operation.

• Frequency change is perfprmed at the rate of 3Hz/second across 20 ~ 110Hz range.

1) Frequency control starting

• 60Hz is the upper limit for 3 minutes after starting.

• 75Hz is the upper limit within 2 hours after turning on power source, and 30 minutes after starting compressor.

2) Pressure limit
The upper limit of high pressure (Pd) is set for each frequency.
When the limit is exceeded, frequency is reduced every 10 seconds.
(Frequency decrease rate (Hz) : 22% of the present value)

3) Discharge temperature limit
Discharge temperature (Td) of compressor is detected during operation. If the upper limit is exceeded, the frequency
is reduced. (Change rate : 5% of the present value)

• 30 seconds after starting compressor, control is performed every minute.

• Operation temperature is 130˚C (266°F).

4) Periodical frequency control
Frequency controll is periodically performed except for the frequency controls at operation start, status change, and
protection.

1 Cycle of periodical frequency control

Periodical frequency control is performed every minute after the time specified below has passed.

• 20 sec after starting compressor or finishing defrostoing operations

• 20 sec after frequency control by discharge temperature or pressure limit

2 Amount of frequency change

The amount of frequency change is controlled corresponding to evaporation temperature (ET) and high pressure

(Pd).

<80TM>

<100TM>

25 (356)

23 (327)
22 (313)

25 (356)

24 (341)
22 (313)

kg/cm2G (psi)

kg/cm2G (psi)

-27-

28˚C (82.4°F) or more

111 111 157

20 ~ 30˚C (68~86°F)

87 87 134

22˚C (71.6°F) or less

64 64 87

3 Back up of frequency control by bypass valve

During 20Hz operations, frequency is backed up by turning on (opening) bypass valve (SV2).

• Cooling
During 20Hz operations 3 minutes after starting compressor, bypass valve is
turned on when ET is -30˚C (-22°F) or less, and turned off when ET is -15˚C
(5°F) or more.

• Heating
During 20Hz operations 3 minutes after starting compressor, SV2 turned on
when high pressure (Pd) exceeds pressure limit (See previous page.), and
turned off when Pd falls to 20kg/cm

2

G or less.

(5) Oil return control (Electronic expansion valve <SLEV>)

Oil return LEV (SLEV) opening is dependent on frequency and outdoor air tem­perature.
SLEV is closed (0) when compressor stops, and SLEV is set (64) for 10 minutes after starting compressor

.

Operation mode

Cooling (Dry)

Operation mode

Heating

Frequency

Outdoor air temp.

20 ~ 74Hz 75 ~96Hz 97Hz or more

Note :1. Differential of outdoor air temperature is 2 degrees.

2. The opening shown above may be expanded for preventing rise in discharge temperature (at Td

>

=

90˚C).

(Number of pulse)

Frequency

Outdoor air temp.

20 ~ 74Hz

75 ~96Hz 97Hz or more

– 87 87 111

ON
OFF

ON
OFF

-30˚C

(-22°F)

(284psi) (313psi)

(5°F)

-15˚C

20kg/cm2G 22kg/cm2G

(6) Subcool coil control (electronic expansion valve <LEV1>)

• The amount of super heat detected from the bypass outlet temperature of subcool coil (TH8) is controlled to be
within a certain range for each 20 sec.

• The opening angle is corrected and controlled depending on the outlet/inlet temperature of subcool coil (TH5, TH7)
and the discharge temperature.

• However, the valve will be closed (0) at heating and compressor stopping.

• It will fully open at defrosting.

(7) Defrost operation control

1) Starting of defrost operations

• After integrated 50 minutes of compressor operations, defrosting operations start when –2˚C (28.4°F) or less of
piping temperature (TH5) is detected for 10 consecutive minutes.

• Forcible defrosting operations start by turning on forcible defrost switch (SW2-7) if 10 minutes have already elapsed
after compressor start or completion of defrosting operations.

2) Completion of defrosting operations
Defrosting operations stop when 10 minutes have passed since start of defrosting operation, or piping temperature
(TH5) reaches 12˚C (53.6°F) (80TMU), 8˚C (46.4°F) (100TMU) or more.
(Defrosting operations do not stop for 2 minutes after starting, except when piping temperature exceeds 20˚C.)

3) Defrosting prohibition
Defrosting operations do not start during oil recovery, and for 10 minutes after starting compressor.

4) Trouble during defrosting operations
When trouble is detected during defrosting operations, the defrosting operations stop, and defrosting prohibition time
decided by integrated operation time of compressor is set to be 20 minutes.

-28-

5) Change in number of operating indoor units during defrosting operations

• In case number of operating indoor units changes during defrosting operations, the defrosting operations continue,
and control of unit number change is performed after the defrosting operations are finished.

• Even in case all indoor units stop or thermostat is turned off during defrosting operations, the defrosting operations
do not stop until expected defrosting activities are completed.

(8) Control of liquid level detecting heater

Detect refrigerant liquid level in accumulator, and heat refrigerant with liquid level heater for judging refrigerant
amount. 6 steps of duty control is applied to liquid level heater depending on frequency and outdoor air temperature,
1minute after starting compressor.

(9) Judgement of refrigerant amount

TdSH=Discharge Super Heat.

=Td-Tsg (low pressure saturation temperature)

TdSH
50<TdSH
45<TdSH<50
40<TdSH<45
20<TdSH<40
TdSH<20

-

-

-

-

15°C<TH5

AL=0
AL=0
AL=0
AL=1
AL=2

-

-

-

-

-

-

20~45Hz

AL=0
AL=1
AL=1
AL=1
AL=2

Compressor

Frequency

46~70Hz

AL=0
AL=0
AL=1
AL=1
AL=2

71Hz~Fmax

AL=0
AL=0
AL=0
AL=1
AL=2

TdSH
90<TdSH
70<TdSH<90
50<TdSH<70
20<TdSH<50
TdSH<20

-

-

-

-

-

-

-

-

TH5<5°C

AL=0
AL=1
AL=1
AL=1
AL=2

TH5

-

-

5°C<TH5<15°C

AL=0
AL=0
AL=1
AL=1
AL=2

Cooling

Heating

-29-

Starts

Finish

30 seconds

LEV opening
before change

LEV opening at refrigerant recovery
(Indoor unit LEV opening 500 pulse)

(10) Refrigerant recovery control

Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit
under cooling mode and that with heating thermostat being turned off.

1) Start of refrigerant recovery
1 Refrigerant recovery is started when the two items below are fully satisfied.

• 30 minutes has passed after finishing refrigerant recovery.

• The level detector detects AL = 0 for 3 minutes continuously, or when the discharge SH is high.

2) Refrigerant recovery operation

• Refrigerant is recovered by opening LEV of the objective indoor units (indoor units under stop. fan, and cooling

modes, and that with heating thermostat being turned off) for 30 seconds.

• The regular capacity control of the outdoor unit and the regular LEV control of the indoor unit are not applied during

refrigerant recovery operation, but are fixed with the value before the recovery operation. These controls will be
conducted one minute after finishing the recovery operation.

• Defrosting operation is prohibited during the recovery operation, and it will be conducted after finishing the recovery

operation.

(11) Control of outdoor unit fan and outdoor unit heat exchanger capacity

1) Control system
Depending on capacity required, control outdoor fan flow rate with phase control, for maintaining evaporation tem­perature (0˚C (32°F) when TH6

>

=

20˚C (68°F) , lower than 0˚C (32°F) when TH6<20˚C (68°F) ) in cooling operations,

and high pressure 18kg/cm

2

G (256psi) in heating operations.

2) Control

• Outdoor unit fan stops when compressor stops.

• Fan is in full operation for 5 seconds after starting.

• Outdoor unit fan stops during defrosting operations.

-30-

YES

NO

YES

NO

YES

YES

NO

NO

[2] Operation Flow Chart

(1) Outdoor unit (Cooling, heating modes)

Note: 1 For about 2 minutes after turning on power source, address and group information of outdoor unit, indoor unit, and remote

controller are retrieved by remote controller, during which "HO" blinks on and off on remote controller. In case indoor unit is
not grouped to remote controller, "HO" display on remote controller continues blinking even after 2 minutes after turning on
power source.

Note: 2 Two trouble modes included indoor unit side trouble, and outdoor unit side trouble. In the case of indoor unit side trouble, error

stop is observed in outdoor unit only when all the indoor units are in trouble. However, if one or more indoor units are
operating normally, outdoor unit shows only LED display without undergoing stop.

Note : 3 Operation mode conforms to mode command by indoor unit. However, when outdoor unit is being under cooling operation,

the operation of indoor unit will be prohibited even by setting a part of indoor units under operation, or indoor unit under
stopping or fan mode to heating mode. Reversely when outdoor unit is being heating operation, the same condition will be
commenced.

"HO" blinks on remote controller
temperature display

Start

Breaker

turned on

Set indoor ad-

dress No. to remote

controller

Operation
command

Operation

mode

52C ON

Operation

mode

Protection function

self-holding

Outdoor unit LED

trouble display

Cooling

operations

Heating

operations

Operation mode command to indoor unit controller

1. 52C OFF

2. Inverter output 0Hz

3. Fan stop

4. All solenoid valve OFF

Normal operations
Trouble observed
Stop

Note: 3

Note: 2

Note: 1

1. Protection function self­holding cancelled

2. Oil return LEV, SC coil LEV
fully closed

Fan

Cooling, Heating

Error mode

Error stop

Error command to

indoor unit

-31-

2

2

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

(2) Indoor unit (Cooling, heating, dry, and fan modes)

Start

Breaker

turned on

Operation

SW turned on

1. Protection function
self-holding cancelled

2. Indoor unit

LEV

fully

closed

Remote controller

display extinguished

Aux. heater

ON

FAN stop

Drain pump

ON

1. Aux. heater
OFF

2. 1 minute low
FAN speed

3-minute drain

pump ON

Protection function

self-holding

Error command

to outdoor unit

Indoor unit LEV

fully closed

Heating

mode

Cooling

mode

Operation mode

Fan mode

Dry mode

Cooling

display

Heating

display

Dry display

Fan displays

Cooling

operations

Prohibition

Prohibition

Prohibition

Heating

operations

Dry

operations

Fan

operations

Prohibition

"Remote con-

troller blinking"

Note: 1

Note: 2

Note: 3

Note: 3

Note: 3

Normal operations
Trouble observed
Stop

Note: 4

Note : 1 At indoor unit LEV fully closed, the opening angle indicates 41.

Note : 2 The error mode includes that of indoor unit and that of outdoor unit. In the former case, the indoor unit in question only

stops in error mood, while in the later case, all indoor units connected to the outdoor unit stop in error mode.

Note: 3 T he operation mode follows the mode command from the indoor unit. However, when the outdoor unit is under cooling

operation, the operation of the indoor unit will be prohibited even a part of indoor units or indoor unit under stopping or fan
mode is put into heating mode. Contrarily, when the outdoor unit is under heating operation, the same condition will be
commenced.

Note: 4 The auxiliary heater can only be equipped to the product of special specification.

Error mode

Error stop

Error display

-32-

1

1

2

YES

NO

YES

YES

NO

NO

(3) Cooling operation

Note : 1 Indoor unit fan operates at set notch in cooling operation regardless of thermostat ON/OFF.

Cooling operation

4-way valve OFF

Indoor unit fan

operations

Test run start

Thermostat ON

Note: 1

3-minute

restart pre-

vention

1. Inverter output 0Hz

2. Indoor unit LEV, oil return LEV,

Subcool coil bypass LEV fully
closed

3. Solenoid valve OFF

4. Outdoor unit fan stop

1. Inverter frequency control

2. Indoor unit LEV, oil return LEV,
Subcool coil bypass LEV fully
closed

3. Solenoid valve control

4. Outdoor unit fan control

2 : (6) 1 or 3 : (6) 2

Normal operations
Test run
Stop

-33-

YES

NO

(4) Heating operation (Only for PUHY)

Normal operations
Defrosting operations
Stop
Test run

Heating operation

Defrosting

operation

4-way valve ON

Test run start

Thermostat ON

3-minute

restart pre-

vention

Defrosting finish

Defrosting

finish

4-way valve OFF

Note: 1
Note: 2

YES

1 : (6) 4 or 3 : (6) 2

1. Indoor unit fan very low speed
operations

2. Inverter output 0Hz

3. Indoor unit LEV, oil return LEV,
Subcool bypass LEV fully closed

4. Solenoid valve OFF

5. Outdoor unit fan stop

1. Indoor and outdoor unit fan
control

2. Inverter frequency control

3. Indoor unit LEV, oil return LEV,
Subcool bypass LEV control

4. Solenoid valve control

1. Indoor unit fan stop

2. Inverter defrost frequency control

3. Indoor unit LEV fully opened,
oil return LEV fully closed,
Subcool bypass LEV fully opened

4. Solenoid valve control

5. Outdoor unit fan stop

Note : 1 When outdoor unit starts defrosting, it transmits defrost operations command to indoor unit, and the indoor unit starts

defrosting operations.
Similarly when defrosting operation stops, indoor unit returns to heating operation after receiving defrost end command of
outdoor unit.

Note : 2 Defrosting start condition : After integrated 50 minutes of compressor operations, and –2˚C or less outdoor unit coil

temperature.

Defrosting end condition : After 15 minutes of defrosting operation or the outdoor unit coil temperature having risen to 12˚C

(80TMU), 8˚C (100TMU) or more for 80TMU and 100TMU.

Note: 1
Note: 2

-34-

NO

YES

NO

YES

NO

YES

YES

NO

YES

YES

NO

(5) Dry operation

Normal operations
Thermostat ON
Stop

Dry operations

4-way valve OFF

Thermostat ON

Test run start

Inlet temp.

>

=

18˚C

Note: 2

Note: 1

1. Indoor unit fan stop

2. Inverter output 0Hz

3. Indoor unit LEV, oil return LEV,
Subcool bypass LEV fully closed

4. Solenoid valve OFF

5. Outdoor unit fan stop

1. Outdoor unit (Compressor)
intermittent operations

2. Indoor unit fan intermittent
operations
(Synchronized with compressor :
low speed, OFF operations)

2 : (6) 1 or 3 : (6) 2

Note : 1 When indoor unit inlet temperature exceeds 18˚C, outdoor unit (compressor) and indoor unit fan start intermittent operations

synchronously. Operations of outdoor unit, indoor unit LEV and solenoid valve accompanying compressor are the same as
those in cooling operations.

Note : 2 Thermostat is always kept on in test run, and indoor and outdoor unit intermittent operation (ON) time is a little longer than

normal operations.

-35-

Low pressure shell scroll
type with capacity control
mechanism
Winding resistance:
Each phase 0.107Ω (20˚C)

Setting 30kg/cm2G OFF

R120=7.465kΩ
B

25/120=4057

Rt =

7.465exp{4057( – )}

R0=15kΩ
B

0/100=3460

Rt =
15exp{3460( – )}

R

50=17k

Ω

B25/50=4170
Rt =

Com- MC
pressor

Pressure 63HS
sensor

Pressure 63H
switch

Thermistor TH1

(discharge)

TH2
(low pressure
saturation
temperature)

TH5
(piping
temperature)

TH6
(outdoor air
temperature)

TH7
(subcool coil
outlet tempe­rature)

TH8
(subcool coil
bypass outlet
temperature)

THHS

Symbol

(function)

Part code Application Specification Check method

Adjust refrigerant circulation by con­trolling operating frequency and ca­pacity control valve with operating
pressure.

1) High press. detection.

2) Frequency control and high pres­sure protection

1) High pressure detection

2) High pressure protection

1) Discharge temperature detection

2) High pressure protection

1) Detects the saturated vapor tem­perature.

2) Calculates the refrigerant
circulation configuration.

3) Controls the compressor
frequency.

4) Controls the outdoor unit’s fan air
volume.

1) Frequency control

2) Defrost control and liquid level de­tection at heating

1) Outdoor air temperature detection

2) Fan control, liquid level heater, and
opening setting for oil return

Subcool coil bypass LEV (LEV1) con­trol

Subcool coil bypass LEV (LEV1) con­trol

1) Detects the inverter cooling fin
temperature.

2) Provides inverter overheating
protection.

3) Controls the control box cooling
fan.

1

1

273+t 393

Continuity check

Resistance value
check

Resistance value
check

Name

Outdoor unit

[3] List of Major Component Functions

1 1

273+t 273

Gnd (black)
Vout (white)
Vcc (DC5V)
(red)

Con­nector

Pressure
0~30 kg/cm2G
Vout 0.5~3.5 V

63HS

0˚C (32˚F) : 15kΩ
10˚C (50˚F) : 9.7kΩ
20˚C (68˚F) : 6.4kΩ
25˚C (77˚F) : 5.3kΩ
30˚C (86˚F) : 4.3kΩ
40˚C (104˚F) : 3.1kΩ

20˚C (68˚F) : 250kΩ70˚C (158˚F) : 34k

Ω

30˚C (86˚F) : 160kΩ80˚C (176˚F) : 24k

Ω

40˚C (104˚F) : 104kΩ90˚C (194˚F) : 17.5k

Ω

50˚C (122˚F) : 70kΩ100˚C (212˚F) : 13.0k

Ω

60˚C (140˚F) : 48kΩ110˚C (230˚F) : 9.8k

Ω

-20˚C (-4˚F) : 605.0kΩ

-10˚C (14˚F) : 323.3kΩ
0˚C (32˚F) : 180.9kΩ
10˚C (50˚F) : 105.4kΩ
20˚C (68˚F) : 63.8kΩ
30˚C (86˚F) : 39.9kΩ
40˚C (104˚F) : 25.7kΩ
50˚C (122˚F) : 17.0kΩ
60˚C (140˚F) : 11.5kΩ
70˚C (158˚F) : 8.0kΩ
80˚C (176˚F) : 5.7kΩ
90˚C (194˚F) : 4.1kΩ
100˚C (212˚F): 3.0kΩ

R

0=33kΩ

B

0/100=3965

Rt =
33exp{3965( – )}

1 1

273+t

273+0

0˚C (32˚F) : 33kΩ

-10˚C (14˚F) : 55kΩ

-20˚C (-4˚F)

: 92kΩ

10˚C (50˚F) : 20kΩ
20˚C (68˚F) : 13kΩ
30˚C (86˚F) : 8.2kΩ

-36-

Symbol

(function)

Part code Application Specification Check method

Name

Solenoid
valve

Electronic
expansion
valve

Liquid
level
detection
heater

Electronic
expansion
valve

Thermistor

SV1
(discharge ­suction by­pass)

SV2
(discharge ­suction by­pass)

SLEV

LEV1
(SC coil)

CH2, CH3
(accumulator
liquid level
detection)

LEV

TH21
(inlet air
temperature)

TH22
(piping
temperature)

TH23
(gas side
piping
temperature)

1) High/low press. bypass at starting/
stopping and capacity control at
low load

2) Discharge press. rise suppression

Capacity control and high press. rise
suppression (backup for frequency
control)

Adjustment of liquid refrigerant (oil)
return foam accumulator

Adjustment of bypass flow rate from
outdoor unit liquid line at cooling

Heating of refrigerant in accumulator
liquid level detection circuit

1) Adjust superheat of outdoor unit
heat exchanger outlet at cooling.

2) Adjust subcool of indoor unit heat
exchanger at heating.

Indoor unit control (thermostat)

1) Indoor unit control (freeze
prevention, hot adjust, etc.)

2) LEV control in heating operation
(Subcool detection)

LEV control in cooling operation
(Superheat detector)

Indoor unit

AC 220V
Open at energizing and
close at deenergizing

AC 220V
Open at energizing and
close at deenergizing

DC12V stepping motor
drive Valve opening 0~480
pulse

Cord heater :2.8kΩ

(1.4kΩ+1.4kΩ)
AC220V
20W (10W + 10W)

DC12V
Opening of stepping motor
driving valve
60~2,000 pulses

R

0 = 15kΩ

B

0/100 = 3460

Continuity check by
tester

Resistance value
check

Continuity check
with tester for white­red-orange
yellow-brown-blue

Resistance value
check

Outdoor unit

: 15kΩ
10˚C (50˚F) : 9.7kΩ
20˚C (68˚F) : 6.4kΩ
25˚C (77˚F) : 5.3kΩ
30˚C (86˚F) : 4.3kΩ
40˚C (104˚F) : 3.1kΩ

Rt =
15exp{3460( – )}

1 1

273+t 273

0˚C (32˚F)

-37-

[4] Resistance of Temperature Sensor

Thermistor for low temperature
Thermistor Ro= 15kΩ ± 3% (TH5 ~ 8) Thermistor R120 = 7.465kΩ ± 2% (TH1)
R

t = 15exp {3460 ( - )} Rt = 7.465exp {4057 ( - )}

∗˚F= × ˚C + 32 ∗˚F= × ˚C + 32

Thermistor Ro = 33kΩ ± 1% (TH2) Thermistor R50 = 17kΩ ± 2% (THHS)
R

t = 33exp {3965 ( - )} Rt = 17exp {4170 ( - )}

∗˚F= × ˚C + 32 ∗˚F= × ˚C + 32

1

273+tc

1

273+tc

1

273+tc

1

273+tc

1

273+50

Temperature (˚C)[˚F] Temperature (˚C)[˚F]

Temperature (˚C)[˚F] Temperature (˚C)[˚F]

Resistance (kΩ)

Resistance (k

Ω)

Resistance (kΩ)

Resistance (kΩ)

1

273+0

1

273+120

1

273+0

9
5

9
5

9
5

9
5

-38-

REFRIGERANT AMOUNT ADJUSTMENT5

Clarify relationship between the refrigerant amount and operating characteristics of CITY MULTI, and perform service
activities such as decision and adjustment of refrigerant amount on the market.

[1] Refrigerant Amount and Operating Characteristics

The followings are refrigerant amount and operating characteristics which draw special attention.

During cooling operations, required refrigerant amount tends to increase (refrigerant in accumulator decreases)
in proportion to increase in the number of operating indoor units. However, the change of increase rate is small.

During heating operations, liquid level of accumulator is the highest when all the indoor units are operating.

Discharge temperature hardly changes when increasing or decreasing refrigerant amount with accumulator
filled with refrigerant.

Compressor shell temperature is 20~70 (36~126) degrees higher than low pressure saturation temperature
(Te) when refrigerant amount is appropriate.
→ Judged as over replenishment when temperature difference from low pressure saturation temperature (Te)
is 10 (18) degrees or less.

[2] Adjustment and Judgement of Refrigerant Amount

(1) Symptom

The symptoms shown in the table below are the signs of excess or lack of refrigerant amount. Be sure to adjust the
amount of refrigerant in refrigerant amount adjustment mode, by checking operation status, judging refrigerant
amount, and performing selfdiagnosis with LED Dip s/w 1, 1-10, for overall judgement of excess or lack of refriger­ant amount.

Tendency of
discharge
temperature

During cooling operations, discharge temperature tends to rise at
overload than low temperature.

During heating operations, discharge temperature tends to rise at low
temperature than overload.

The lower the operating frequency is, the higher the discharge
temperature tends to become of deteriorated compressor efficiency.

Comparison including
control system

Emergency stop at 1500 remote controller display (excessive
refrigerant replenishment)

Operating frequency does not fully increase, thus resulting in
insufficient capacity

Emergency stop at 1102 remote controller display (discharge
temperature trouble)

Emergency stop occurs when the remote control display is at

1501. (insufficient refrigerant)

Excessive refrigerant replenishment

Insufficient refrigerant replenishment

Insufficient refrigerant

1

2

3

4

5

1

2

3

4

Note : ˚C Scale (˚F Scale)

-39-

(2) Refrigerant Volume Adjustment Operation

1) Operating Characteristics Refrigerant Volume
Characteristic items related to operating characteristics and the refrigerant volume are shown below.

If the number of indoor units in operation increases during cooling, the required volume of refrigerant tends to
increase (the amount of refrigerant in the accumulator tends to decrease), but the change is minimal.

The liquid level in the accumulator is at its highest when all the indoor units are operating during heating.
If there is refrigerant in the accumulator, even if the volume of refrigerant is increased or decreased, there is practi-

cally no change in the outlet temperature.

During cooling, the discharge temperature rises more easily when there is an
overload than when the temperature is low.

During heating, the discharge temperature rises more easily when the tempera­ture is low than when there is an overload.

The lower the operating frequency, the less efficient the compressor is, making it
easier for the discharge temperature to rise.

The compressor shell temperature becomes 20~70 (36~126) deg. higher than the low pressure saturation tempera­ture (TH2) if the refrigerant volume is appropriate. If the difference with the low pressure saturation temperature
(TH2) is 10 (18) deg. or less, it can be judged that the refrigerant is overcharged.

2) Adjusting and Judging the Refrigerant Volume

1 Symptoms

Overcharging with refrigerant can be considered as the cause of the following symptoms. When adjusting the
refrigerant volume, be sure that the unit is in the operating condition, and carry out refrigerant volume judgment and
self-diagnosis by the LED’s, judging overall whether the volume of refrigerant is in excess or is insufficient. Perform
adjustments by running the unit in the refrigerant volume adjustment mode.

2 Refrigerant V olume
a Checking the Operating Condition

Operate all the indoor units on cooling or on heating, checking the discharge temperature, sub-cooling, low pres­sure saturation temperature, inlet temperature, shell bottom temperature, liquid level, liquid step, etc. and rendering
an overall judgment.

1
2

3

4

5

Tendency of
discharge
Temperature

Comparison
when control is
included.

Emergency stop occurs when the remote control display is at 1500 (refrigerant
overcharge).

The operating frequency doesn’t rise high enough and capacity is not achieved.
Emergency stop occurs when the remote control display is at 1102 (outlet

temperature overheating).
Emergency stop occurs when the remote control display is at 1501 (insufficient

refrigerant).

1
2
3

4

Refrigerant overcharge

Insufficient refrigerant

Insufficient refrigerant

Judgement

Refrigerant volume tends toward
insufficient.

Rifrigerant volume tends toward
overcharge.

Condition
1 Outlet temperature is high. (125°C (257˚F) or higher)
2 Low pressure saturation temperature is extremely low.
3 Inlet superheating is high (if normal, SH = 20 (36) deg or lower).
4 Shell bottom temperature is high (the difference with the low pressure saturation

temperature is 70 (126) deg. or greater)

5 Shell temperature is low (the difference with the low pressure saturation tem-

perature is 10 (18) deg. or lower).

6 Dischange superheating is low (if normal, SH = 20 (36) deg or higher).

Note : ˚C Scale (˚F Scale)

Note : ˚C Scale (˚F Scale)

-40-

b Check the refrigerant volume by self-diagnosis using the LED.

Set the self-diagnosis switch (SW1) as shown below and check the past information (history) concerning the
refrigerant volume.

Set SW1 as shown in he figure at right.

If LD8 lights up, it indicates the refrigerant charge abnormal delay state just before emergency stop due to refriger­ant overcharge (1500).

3 Additional Refrigerant Charge Volume

At the time of shipping from the factory, the outdoor unit is charged with the amount of coolant shown in the follow­ing table, but since no extension piping is included, please carry out additional charging on-site.

Outdoor Unit Model Name PUHY-80TMU-A PUHY-100TMU-A
Refrigerant Charge Volume 6.5kg 9kg

(14lb 6oz) (19lb 14oz)

Calculation Formula
Calculate the additional refrigerant volume by calculating the size of the extension liquid piping and its length units (m)[ft].

Additional Refrigerant Volume (kg) = (0.12 × L

1) + (0.06 × L2) + (0.024 × L3) + A

[ (oz) = (1.29 × L1) + (0.65 × L2) + (0.26 × L3) + A ]

L

1: Length of ø12.7 (3/4") liquid pipe (m) [ft]

L2: Length of ø9.52 (3/8") liquid pipe (m) [ft]
L3: Length of ø6.35 (1/4") liquid pipe (m) [ft]
A: refer to the calculation table.

In the calculation results, round up fractions smaller than 0.01 kg. (Example: 18.54 kg → 18.6 kg)

1.0oz (653.97oz → 654oz)

(Calculation Table)

Total Capacity of A

Connected Indoor Units kg (oz)

~64 1.5 (53)
65~ 2.0 (71)

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ON

-41-

3) Refrigerant Volume Adjustment Mode Operation

1 Procedure

TH1 Self-diagnosis Switch TH5 Self-diagnosis Switch

TH7 Self-diagnosis Switch Tc Self-diagnosis Switch

Using these, judge TH1, Tc - TH5 and Tc - TH7.

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ON

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ON

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ON

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ON

Operation

Measure

The outdoor unit LEV1 diverges more than usual during cooling operation.

Depending on the operating conditions, it may be necessary either to charge with supplementary refrigerant, or to

1

drain out some, but if such a case arises, please follow the procedure given below flow chart.

A

C

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ON

Switching the function select switch (SW2-4), located on the outdoor unit's control board, ON starts
refrigerant volume adjustment mode operation and the following operation occurs. (Refrigerant recovery
mode and oil recovery mode will be invalid.)

2

Additionary, if the LED monitor display switch (SW1) on the outdoor unit's control board
is set to the composition of refrigerant circulating in the refrigeration cycle ( OC).

Note 1: Even if the refrigerant volume has reached a suitable level shortly after starting refrigerant volume

adjustment mode, if left for a sufficient length of time (once the refrigeration system has stabilized), there
are times when this level may become unsuitable.

1) The refrigerant volume is suitable.
When the refrigerant volume for TH5-TH7 is more than 5K at the outdoor unit, and 6 to 13K for SH at
the indoor unit.

2) The current volume is suitable, however, may become unsuitable after a certain length of time.
When the refrigerant volume for TH5-TH7 is less than 5K at the outdoor unit, or less than 6K for SH at
the indoor unit.

Note 2: There are times when it becomes difficult to determine the volume when performing refrigerant

adjustments if the high pressure exceeds 1.37MPa.

Note 3: Based on the following flowchart, use TH1, TH5, TH7 and Tc to adjust the refrigerant volume. Use the

self-diagnosis switch (SW1) on the outdoor unit main PCB to display TH1, TH5, TH7 and Tc.

When running refrigerant volume adjustment mode in the cooling operation, if note 2 above applies,
determine the suitable refrigerant volume after waiting until outdoor units TH 5-7 reach
more than 5K, and the indoor unit SH is in the range of 6 to 9K.

Turn on the outdoor unit self-diagnosis switch and then monitor the LED for the indoor unit SH.

-42-

Refrigerant adjustment method

Note 2 , Ensure that no refrigerant is released into the
atmosphere

Note 1, Operated using outdoor unit DIP SW3-1 and 3-2.

Note 3 , Always charge the system with liquid
refrigerant, if the system is charged with
gas the composition will change and
capacity will be reduced

Wait for 30minutes of

Note 1

compressor operation

= Yes
= No

Note 4 , K = Degrees Kelvin

273K = 0°C

Wait 5minutes before making next judgment.

Wait 5minutes before making next judgment.

Wait 5minutes before making next judgment

Start

All indoor units are run in
test cooling mode

Minimum of
30minutes
continuous
operation

TH1 equal or
less than
115°C

Add a small amount of
refrigerant to the low
pressure service port.

Power supply to outdoor unit
has been on for 8 hours

or
30minutes of compressor running

and a stable compressor
frequency.

Tc-TH5 is less than or
equal to 10K and
greater than or equal
to 3K

TH1 equal or less
than 110°C

Tc-TH7 is greater
than or equal to
20K

Tc-TH5 is less
than 3K

Add asmall amount of
refrigerant at the low pressure
service port.

Add a small amount of
refrigerant at low pressure
service port.

Add a small amount of
refrigerant at low pressure
service port.

Remove a small amount of
refrigerant at lowpressure
service port.

System has the correct
amount of refrigerant

FINISH

-43-

6 TROUBLESHOOTING

[1] Principal Parts

Pressure Sensor

(1) Judging Failure

1) Check for failure by comparing the sensing pressure according to the high pressure sensor and the pressure gauge
pressure.
Turn on switches 1, 3, 5, 6 of the digital display select switch (SW1) as shown below, and the sensor pressure of the
high pressure sensors is displayed digitally by the light emitting diode LD1.

High Pressure

1 In the stopped condition, compare the pressure readings from the gauge and from the LD1 display.

(a) If the gauge pressure is 0~0.098MPa (0~14.2 psi), the internal pressure is dropping due to gas leakage.
(b) If the pressure according to the LD1 display is 0~0.098MPa (0~14.2 psi), there is faulty contact at the connec-

tor, or it is disconnected. Proceed to 4.
(c) If the pressure according to the LD1 display is 3.14MPa (455 psi) or higher, proceed to 3.
(d) If other than (a), (b) or (c), compare the pressure readings during operation. Proceed to 2.

2 Compare the pressure readings from the gauge and from the LD1 display while in the running condition.

(a) If the difference between the two pressures is within 0.098MPa (14.2 psi), both the affected pressure sensor

and the main MAIN board are normal.
(b) If the difference between the two pressures exceeds 0.098MPa (14.2 psi), the affected pressure sensor is faulty

(deteriorating performance).
(c) If the pressure reading in the LD1 display does not change, the affected pressure sensor is faulty.

3 Disconnect the pressure sensor from the MAIN board and check the pressure according to the LD1 display.

(a) If the pressure is 0~0.098MPa (0~14.2 psi) on the LD1 display, the affected pressure sensor is faulty.
(b) If the pressure is 3.14MPa (455 psi) or higher, the MAIN board is faulty.

4 Disconnect the pressure sensor from the MAIN board and short out the No. 2 and No. 3 pins of the connector

(63HS), then check the pressure by the LD1 display.
(a) If the pressure according to the LD1 display is 3.14MPa (455 psi) or higher, the affected pressure sensor

is faulty.
(b) If other than (a), the MAIN board is faulty .

2) Pressure sensor configuration.
The pressure sensors are configured in the circuit shown in the figure at right. If DC 5 V is applied between the red
and black wires, a voltage corresponding to the voltage between the white and black wires is output and this voltage
is picked up by the microcomputer. Output voltages are as shown below.

High Pressure 0.1 V per 0.098MPa (14.2 psi)

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ON

Connector

Vout 0.5~3.5 V

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

63HS

-44-

Solenoid Valve (SV1, SV2)

Check if the control board’s output signals and the operation of the solenoid valves match.
Setting the self-diagnosis switch (SW1) as shown in the figure below causes the ON signal of each relay to be output to the
LED’s.
Each LED shows whether the relays for the following parts are ON or OFF. When a LED lights up, it indicates that the relay
is ON.

SW1

LED

12345678

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ON

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ON

Compressor

operating.

Crankcase

Heater

Lights up

all the

time.

21S4 SV1 SV2

1) In the case of SV1 (Bypass Valve)

(a) When the compressor starts, SV1 is ON for 4 minutes, so check operation by whether the solenoid valve is emitting

an operating noise.

(b) Changes in the operating condition by solenoid valve operation can be confirmed by the temperature of the bypass

circuit and the sound of the refrigerant.

2) In the case of SV2 (Bypass)

(a) SV2 goes ON in accordance with the rise in the high pressure in the cooling mode and heating mode, so check its

operation by the LED display and the operating noise emitted by the solenoid valve.

(b) Changes in the operating condition by solenoid valve operation can be confirmed by the temperature of the bypass

circuit and the sound of the refrigerant.

✻

Connector connection specifications on the pressure sensor body side.
The connector’s pin numbers on the pressure sensor body side differ from the pin numbers on the main circuit board side.

Sensor Body Side MAIN Board Side

Vcc Pin 1 Pin 3
Vout Pin 2 Pin 2
GND Pin 3 Pin 1

CH 2, 3

Fluid
Level

Heater

-45-

Outdoor LEV

The valve opening angle changes in proportion to the number of pulses.
(Connections between the outdoor unit’s MAIN board and SLEV, LEV1 (outdoor electronic expansion valve))

Pulse Signal Output and Valve Operation

LEV Valve Closing and Valve Opening Operations

✻

When the power is switched ON, a 520 pulse valve
opening signal is output to make sure the valve’s
position, so that it is definitely at point A. (The pulse
signal is output for approximately 17 seconds.)

When the valve operates smoothly, there is no
sound from the LEV and no vibration occurs, but
when the valve is locked, it emits a noise.

✻

Whether a sound is being emitted or not can be de­termined by holding a screwdriver, etc. against it,
then placing your ear against the handle.

✻

If there is liquid refrigerant inside the LEV, the sound
may become lower.

Output pulses change in the following orders when the

Valve is Closed 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1
Valve is Open 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8

✻

1.When the LEV opening angle does not change, all
the output phases are off.

2.When the output is out of phase or remains ON con­tinuously, the motor cannot run smoothly, but move
jerkily and vibrates.

Output State

12345678

ø1 ON OFF OFF OFF OFF OFF ON ON
ø2 ON ON ON OFF OFF OFF OFF OFF
ø3 OFF OFF ON ON ON OFF OFF OFF
ø4 OFF OFF OFF OFF ON ON ON OFF

Output (Phase)

No.

Driver Circuits

Outdoor MAIN Board
(Connectors CNLV1,
CNLV2)

Gray
Black
Yellow
Red
Orange

Valve Opening Angle (Flow Rate)

Valve
Closing

Valve Opening

Fully Open
480 pulses

Pulse Count

-46-

Judgment Methods and Likely Failure Mode

Caution:

The specifications of the outdoor unit (outdoor LEV) and outdoor units (indoor LEV) differ. For this reason, there are
cases where the treatment contents differ, so follow the treatment specified for the appropriate LEV as indicated in the
right column.

Disconnect the control board connector and connect the
check LED as shown in the figure below.

When the base power supply is turned on, the indoor LEV
outputs pulse signals for 10 seconds.
If the LED does not light up, or lights up and remains on,
the driver circuit is abnormal.

If the LEV is locked up, the drive motor turns with no load
and a small clicking sound is generated.
Generation of this sound when the LEV is fully closed or
fully open is abnormal.

Measure the resistance between the coils (red - white, red

- orange, brown - yellow, brown - blue) using a tester.
They are normal if the resistance is within 150Ω ± 10%.

Measure the resistance between the coils (gray - orange,
gray - red, gray - yellow, gray - black) using a tester. They
are normal if the resistance is within 46Ω ± 3%.

If you are checking the indoor unit’s LEV, operate the in­door unit in fan mode and at the same time operate other
indoor units in the cooling mode, then check the piping
temperatures (liquid pipe temperatures) of the indoor unit
by the operation monitor through the outdoor unit control­ler board. When the fan is running, the linear expansion
valve is fully closed, so if there is leakage, the temperature
sensed by the thermistor (liquid pipe temperature sensor)
will become low. If the temperature is considerably low

compared to the remote control’s in­take temperature display, it can be
judged that there is a fully closed fail­ure. In the case of minimal leakage, it
is not necessary to replace the LEV if
there are no other effects.

1 Check for pins not fully inserted on the connector and

check the colors of the lead wires visually.

2 Disconnect the control board’s connector and conduct

a continuity check using a tester.

Microcomputer
Driver Circuit
Failure

LEV mechanism
is locked.

The LEV motor
coils have a
disconnected
wire or is
shorted.

Fully Closed
Failure (valve
leaks)

Faulty wire
connections in
the connector or
faulty contact.

In the case of driver circuit
failure, replace the indoor
unit’s control board.

Replace the LEV.

Replace the LEV coils.

Replace the LEV coils.

If there is a large amount of
leakage, replace the LEV.

Check the continuity at the
places where trouble is found.

Indoor

Indoor

Outdoor

Indoor

Outdoor

Indoor

Indoor

Outdoor

Failure Mode Judgment Method Treatment Affected LEV

Thermistor
(TH21)

Linear
Expansion
Valve

-47-

Outdoor LEV (SLEV, LEV1) Coil Removal Procedure (configuration)
As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated.

<Removing the Coils>
Fasten the body tightly at the bottom (Part A in the figure) so that
the body will not move, then pull out the coils toward the top. If
they catch on the stopper and are difficult to take out, turn the
coils left and right until the stoppers are free from the stopper
indentations, then pull the coils out.
If you take out the coils only without gripping the body, undue
force will be applied to the piping and the pipe may be bent over,
so be sure to fasten the body in such a way that it will not move.

<Installing the Coils>
Fasten the body tightly at the bottom (Part A in the figure) so that
the body will not move, then insert the coils from the top, inserting
the coils’ stopper securely in one of the indentations on the body.
(There are four indentations for the stopper on the body around
its circumference, and it doesn’t matter which indentation is
used. However, be careful not to apply undue force to the lead
wires or twist them around inside the body.) If the coils are in­serted without gripping the body, it may exert undue force on the
piping, causing it to become bent, so be sure to hold the body
firmly so that it won’t move when installing the coils.

Part A

Coils

Stopper

Lead Wires

Body

Indentation for
Stopper
(12 places
around the
circumference)

Part A

-48-

Intelligent Power Module (IPM)

The measured v

Measure resistances between each terminal of IPM with tester, and use the results for troubleshooting.

alues for troubleshooting are shown in the table below.

Diode stack

P

(Restrictions to applicable tester are the same as those of IPM)

erform continuity check with tester. Judged as normal if the following characteristics are observed.

123

1
2
3

+

–

W

• External view • Internal circuit diagram

• Judged value

∞
∞
∞

P

P

Tester

Black

N

5~
200

Ω

5~
200

Ω

5~
200

Ω

5~
200

Ω

5~
200

Ω

5~
200

Ω

U

V

W

NUVW

∞

∞∞∞

∞
∞

+

+

Tester

Black

—

1
2
3

—

123

N

P

B

V

V

U

P

W

N

B

U

3

2

1
6

5

4
9

8

7
11

13

10

14

15

12

16

Pre-Driver

Pre-Driver

Pre-Driver

Pre-Driver

Pre-Driver

Pre-Driver

Over heating

Temperature sensor

protection circuit

16 10 7 4 1

1 Focus on whether there is a complete open (∞Ω) state or short-circuit (~0Ω).

The measured resistance value is a guideline and may deviate slightly.
Measure between several similar measurement points.
If the value does not differ by more than double or half from the other points, then judge the state as OK.

2 Restrictions to applicable tester

Use a tester with an internal power of 1.5V or more.

❇

Battery type tester

A card tester with button battery has a low applied voltage, so the resistance value of the diode characteristics
cannot be measured correctly.
Use a measurement range that measures the low resistance when possible. An accurate measurement with less
fluctuation will be possible.

5~
200

Ω

5~
200

Ω

5~
200

Ω

5~
200

Ω

5~
200

Ω

5~
200

Ω

Tester

Red

∞∞∞

Tester

Red

-49-

1

2

Despite pressing of
remote controller
switch, operation
does not start with no
electronic sound.

(No powering signal
appears.)

At about 10 seconds
after turning remote
controller operation
switch ON, the
display distinguishes
and the operation
stops.

1) M-NET transmission power source is not supplied
from outdoor unit.

1Main power source of outdoor unit is not connected.
2Slipping off of connector on outdoor unit circuit

board
Main board : CNS1, CNVCC3
INV board : CNDC2, CNVCC2, CNL2
G/A board : CNDC1

3

Faulty power source circuit of outdoor unit

• Faulty INV board,

• Blown fuse (F01 on G/A board)

• Broken diode stack

• Broken resistor (R1) for rush current protection

2) Short circuit of transmission line

3) Erroneous wiring of M-NET transmission line at outdoor unit
1Transmission line disconnection or slipping off from terminal

block

2Erroneous connection of indoor/outdoor transmission line to

TB7

4) Slipping off of transmission wiring at remote controller

5) Faulty remote controller

The cause of 2) and 3) is dis­played with self-diagnosis
LED for 7102 error.

1) Power source is not fed to indoor unit from transformer.

1Main power source of indoor unit is not turned on.
2Slipping off of connector (CND, CNT, CN3T) on indoor controller board
3Blown fuse on indoor controller board
4
5

Faulty or disconnected transformer of indoor unit
Faulty indoor controller board

3) Faulty outdoor control circuit board or being out of control
As normal transmission is failed between indoor and outdoor units, outdoor unit model can not be
recognized.

Checking method & countermeasure

Symptom Cause Checking method & countermeasure

(5) Trouble and remedy of remote controller

Extinguishing or
unable to confirm

Check indoor LED1

Lighting?

Lighting

Check fuse on circuit
board

Blown?

Check connector slip­ping off

(CND, CNT, CN3T)

Slipped off?

Check transformer
resistance value

Within rated?

Check self-diagnosis
function of outdoor unit

Check for the change of LED
display by operating dip switch
SW1 for self-diagnosis.

Changed?

Check main power source
of power source wiring.

Apply power
source again.

Check 220V circuit for
short circuit and ground
fault.

Improper connector
connection

Changed?

Casual
trouble

Repair
faulty point.

Faulty outdoor unit
control circuit board

Faulty indoor
controller board

Check self-diagnosis function
after powering outdoor unit again.

Check indoor unit
power source terminal
block voltage

NO

YES

YES

✻

1

NO

NO

YES

NO

NO

YES

YES

YES

NO

Check cause of trans­former disconnection.

•Ground fault on circuit
board

•Ground fault on
sensor, LEV

208~230V?

✻

1 Check the transformer in accordance with the “TROUBLE SHOOTING” in the indoor unit’s service handbook.

a) Check transmission terminal block of re-

mote controller for voltage.

i) In case of 17 ~ 30V

→ Faulty network remote controller

ii) In case of less than 17V

→ See “Transmission Power Circuit
(30V) Check Procedure” on Page 54.

-50-

3

“HO” display on re­mote controller does
not disappear and
switch is ineffective.

Symptom Cause

(Without using MELANS)

1) Outdoor unit address is set to “00.”

2) Erroneous address
1Address setting miss of indoor unit to be coupled with remote controller

(Remote controller is not set to - 100.)

2Address setting miss of remote controller

(Indoor unit is not set to + 100.)

3) Faulty wiring of transmission terminal block

TB5

of indoor unit in the same group

with remote controller

4) Centralized control SW2-1 of outdoor unit is turned ON.

5) Disconnection or faulty wiring of indoor unit transmission line

6) Disconnection between indoor unit

M-NET

transmission line terminal block

(TB5) and connector CN2M

7) More than 2 sets of power supply connector (CN40) are inserted into centralized control transmission
line of outdoor unit.

8) Faulty outdoor unit control circuit board

9) Faulty indoor controller board

10) Faulty remote controller

(Interlocking control with MELANS)

11) No grouping registration from MELANS (Neglecting to set the relation between indoor unit and net-

work remote controller)

12) Slipping off of centralized control transmission line (TB7) at outdoor unit

13) At system connected with MELANS, power supply connector (CN40) is inserted to centralized con-

trol transmission line of outdoor unit

In case no MELANS used

Same symptom for all
units in a single refriger­ant system?

Check outdoor
unit address

51 ~ 100?

Check centralized control
switch SW2-1 at outdoor unit

ON?

Faulty outdoor unit
control circuit board

Outdoor unit
address set­ting miss

Switch setting
miss
Make it ON
→OFF

Slipping off of
CN2M
connector

Repair spot
in trouble

Setting miss
of Fresh
Master SW3-1

Indoor unit + 100?

Check address of
coupling indoor unit

17 ~ 30V?

Slipping off?

Check Fresh Master SW3-1

ON?

Faulty indoor controller board
or remote controller

Check voltage of indoor unit M­NET transmission terminal block

Address setting
miss of remote
controller

Indoor address
setting miss

Transmission line
wiring miss of in­door unit M-NET

Check connection between indoor unit M-NET trans­mission terminal block (TB5) and connector CN2M

YES

YES

NO

YES

NO

NO

YES

YES

YES

NO

In case with MELANS used
When MELANS is used, “HO” display on the remote controller will disappear at the group registration of the indoor unit and local

remote controller.
If “HO” does not disappear after the registration, check the items 12) ~ 14) in the Cause column.

Checking method & countermeasure

Remote controller

–100?

NO

NO

NO

YES

NO

Confirm address of remote
controller with "HO" displayed

YES

-51-

Symptom Cause Checking method & countermeasure

[Generates at registration and confirmation]

1) Erroneous address of unit to be coupled

2) Slipping off of transmission line of unit to be
coupled (No connection)

3) Faulty circuit board of unit to be coupled

4) Installation miss of transmission line

[Confirmation of different refrigerant system con­troller]

5) Breaking of power source of outdoor unit to be
confirmed

6) Slipping off of centralized control transmission
line (TB7) of outdoor unit

7) Power supply connector (CN40) is not inserted
into centralized control transmission line in
grouping with different refrigerant system with­out using MELANS

8) More than 2 sets of power supply connector
are inserted into the centralized control trans­mission line of outdoor unit

9) In the system connected with MELANS, power
supply connector (CN40) is inserted into the
centralized control transmission line of outdoor
unit.

10) Short circuit of centralized control transmission
line

a) Confirm the address of unit to be coupled.
b) Check the connection of transmission line.
c) Check the transmission terminal block voltage

of unit to be coupled
i) Normal if voltage is DC17 ~ 30V
ii) Check the item d) in case other than i).

d) Confirm the power source of outdoor unit to be

coupled with the unit to be confirmed

e) Confirm that the centralized control transmis-

sion line (TB7) of outdoor unit is not slipped off.

f) Confirm the voltage of centralized control trans-

mission line.
i) Normal in case of 10V ~ 30V
ii) Check the items 7) ~ 10) left in case that

other than i).

“88” appears on re­mote controller at the
registration and
access
remote controller

4

`

-52-

Transmission Power Circuit (30 V) Check Procedure
If “

” is not displayed by the remote control, investigate the points of the trouble by the following procedure and correct it.

DC24~30 V

Except the above-mentioned

Connector disconnected

Except the above-mentioned

DC24~30 V

Except the above-mentioned

DC24~30 V

Except the above-mentioned

0.5~2.5Ω

Except the above-mentioned

DC280~342 V

Except the above-mentioned

0 Ω

Except the above-mentioned

20~24 Ω
Except the above­mentioned

refer to "Judging Diode
stack Failure"
Except the above-mentioned

AC187~253 V

Except the above-mentioned

No. Check Item Judgment Response

Disconnect the transmission line from TB3
and check the TB3 voltage.

Check if the following connectors are
disconnected in the outdoor unit’s control
box.
MAIN Board: CNS1, CNVCC3
INV Board: CNVCC2, CNL2, CNDC2

Disconnect the wires from CNVCC3 on the
Main board and check the voltage between
pins 1 and 3 on the wire side of the
CNVCC3.

Tester + .......... 1 pin

Tester - .......... 3 pin

Disconnect the wiring from CNVCC2 on the
INV board and check the voltage between
pins 1 and 3 of CNVCC2.

Tester + .......... 1 pin

Tester - .......... 3 pin

Disconnect the wiring from CNL2 on the
INV board, and check the resistance at
both ends of choke coil L2.

Check the voltage between pins 1 and 3 of
CNDC2 on the INV board.

Check the resistance at both ends of F01
on the G/A board.

Check the resistans at both ends of R1

Chcke the DS

Check the voltage between RS and T on
power supply terminal block TB1.

Check the transmission line for the following, and
correct any defects.
Broken wire, short circuit, grounding, faulty
contact.

to No. 2

Connect the connectors as shown on the electric
wiring diagram plate.

to No. 3

Check the wiring between CNS1 and TB3 for the
following, and correct any defects.
Broken wire, short circuit, grounding, faulty
contact.
If there is no trouble, replace the Main board.

to No. 4

Check the wiring between CNVCC2 and
CNVCC3 for the following, and correct any
defects.
Broken wire, short circuit, grounding, faulty
contact.

to No. 5

to No. 6

Replace choke coil L2.

Replace the INV board.

to No. 7

to No. 8

Replace F01

to No. 9
Replace R1

to No.10
Replace DS

Check the wiring to TB1 for the following and
correct any defects.
Broken wire, faulty contact.

Check the power supply wiring and base power
supply, and correct any defects.

1

2

3

4

5

6

7

8

9

10

-53-

(6) Investigation of transmission wave shape/noise

Control is performed by exchanging signals between outdoor unit, indoor unit and remote controller by M-NET trans­mission. If noise should enter into the transmission line, the normal transmission will be hindered causing erroneous
operation.

1) Symptom caused by the noise entered into transmission line

2) Method to confirm wave shape

Cause Erroneous operation Error code

Noise entered into Signal changes and is misjudged as the signal of other 6600
transmission line address.

Transmission wave shape changes to other signal due 6602
to noise.

Transmission wave shape changes due to noise, and can 6607
not be received normally thus providing no reply (ACK).

Transmission can not be made continuously due to the 6603
entry of fine noise.

Transmission can be made normally, but reply (ACK) or 6607
answer can not be issued normally due to noise. 6608

<with transmission>

<without transmission>

Check the wave shape of transmission line with an oscilloscope to confirm that the following
conditions are being satisfied.

1 The figure should be 104µs/bit ± 1%.
2 No finer wave shape (noise) than the transmission signal (52µs ± 1%) should be allowed. ✻1
3 The sectional voltage level of transmission signal should be as follows.

✻

1 However, minute noise from the DC-DC converter or inverter operation may be picked up.

Logical value Transmission line voltage level

0VHL = 2.0V or more
1VBN = 1.3V or less

▼

▼

▼

▼

▼

▼

▼

▼

No fine noise allowed ✻1

V

BN

VHL

52µs52µs52µs52µs52µs

Logical value "0

"

Logical value "1"

No fine noise allowed✻1

-54-

3) Checking and measures to be taken

(a) Measures against noise

Check the items below when noise can be confirmed on wave shape or the error code in the item 1) is generated.

Items to be checked Measures to be taken

1 Wiring of transmission and power lines

in crossing

2 Wiring of transmission line with that of

other system in bundle

3 Use of shield wire for transmission line

(for both indoor unit control and central­ized control)

4 Repeating of shield at the repeating of

transmission line with indoor unit

5 Are the unit and transmission lines

grounded as instructed in the INSTAL­LATION MANUAL?

6 Earthing of the shield of transmission

line (for indoor unit control) to outdoor
unit

7 Arrangement for the shield of transmis-

sion line (for centralized control)

Isolate transmission line from power line (5cm or more).
Never put them in a same conduit.

Wire transmission line isolating from other transmission line.
Wiring in bundle may cause erroneous operation like crosstalk.

Use specified transmission wire.

Type : Shield line CVVS/CPEVS
Wire diameter : 1.25mm

2

or more

The transmission line is wired with 2-jumper system. Wire the
shield with jumper system as same for transmission line.
When the jumper wiring is not applied to the shield, the effect
against noise will be reduced.

Connect to ground as shown in the INSTALLATION MANUAL.

One point earthing should be made at outdoor unit.
Without earthing, transmission signal may be changed as the
noise on the transmission line has no way to escape.

For the shield earth of the transmission line for centralized con­trol, the effect of noise can be minimized if it is from one of the
outdoor units in case of the group operation with different refrig­erant systems, and from the upper rank controller in case the
upper rank controller is used.
However, the environment against noise such as the distance of
transmission line, the number of connecting sets, the type of
connecting controller, and the place of installation, is different for
the wiring for centralized control. Therefore, the state of the
work should be checked as follows.
a) No earthing

• Group operation with different refrigerant systems
One point earthing at outdoor unit

• Upper rank controller is used
Earthing at the upper rank controller

b) Error is generated even though one point earth is being con-

nected.
Earth shield at all outdoor units.

Connect to ground as shown in the user’s manual.

Checking for wiring method

Check for earthing

(b)When the wave height value of transmission wave shape is low, 6607 error is generated, or remote controller is

under the state of "HO."

8 The farthest distance of transmission

line is exceeding 200m.

9 The types of transmission lines are dif-

ferent.

; No transmission power (30 V) is being

supplied to the indoor unit or the remote
control.

AFaulty indoor unit/remote controller

Confirm that the farthest distance from outdoor unit to indoor
unit/remote controller is less than 200m.

Use the transmission wire specified.

Type of transmission line : Shield wire CVVS/CPEVS
Wire dia.of transmission line: 1.25mm

2

or more

Refer to “Transmission Power Supply (30 V) Circuit Check Pro­cedure.”

Replace outdoor unit circuit board or remote controller.

Items to be checked Measures to be taken

-55-

4) Treatment of Inverter and Compressor Troubles
If the compressor does not work when error codes 4240 or 4250 are detected, determine the point of malfunction
by following the steps in the appropriate sections on the pages starting from page 75, then perform the procedures
below.

1 If it was kept on for 2 hours or longer

as specified

2 It was kept on for less than the

specified period.

1 The inverter stops and the same

error code is displayed.

1 The compressor stops and the same

error code is displayed.

2 If the inverter’s output voltage is

output with good balance,

✻

1

3 If the balance in the inverter’s output

voltage is not good or if the inverter’s
output voltages are all 0 V (a digital
tester cannot be used)

✻

1

No.

Check Item Symptoms Treatment

How many hours was the
power kept on before
operation?

When it is restarted, does the
trouble reappear?

Run the outdoor unit with the
wiring to the compressor
disconnected. At this time,
change SW1-1 on the INV
board to ON.
Note) The terminals of the 3

disconnected wires
should be isolated from
each other.

Go to [2].

Go to [2] after keeping the power on for the
specified time.

Perform the check of wiring shown in the
explanation of each error code.

Check the IPM is faulty. (Go to
“Individual Parts Failure Judgment Methods.”)

Check the coil resistance and insulation
resistance of the compressor, and if it is normal,
run it again, and if the trouble occurs again,
replace the compressor.

✻

Insulation resistance : 1MΩ or more
Coil resistance : 0.11Ω(20˚C)

Check the IPM

1

2

3

✻

1 [Cautions when measuring the voltage and current of the inverter’s power circuit.]

Since the voltage and current on the inverter’s power supply side and its output side do not have a sine waveform, the
measurement values will differ depending on the measuring instrument and the circuit measured.
In particular, as the inverter’s output voltage has a pulse waveform, the output frequency also changes, so differences in
measurement values will be great depending on the measuring instrument.
1 When checking if the inverter’s output voltage is unbalanced or not (relative comparison of the voltages between each

of the lines), if you are testing with a portable tester, be sure to use an analog tester.
Use a tester of a type which can be used to judge if the IPM or diode module is faulty.
In particular, in cases where the inverter’s output frequency is low, there are cases where the variations in measured
voltage values between the different wires will be great when a portable digital tester is used, when in actuality they are
virtually equal, and there is danger of judging that the inverter is faulty.

2 It is recommended when checking the inverter’s output voltage values (when measuring absolute values), that, if a

measuring device for business frequencies is used, a rectified voltage meter (with a

symbol) be used.

Correct measurement values cannot be obtained with an ordinary portable tester. (either analog or digital)

Judge that the IPM is faulty. (Go to “Individual
Parts Failure Judgment Methods.”)
If the IPM is normal, replace the INV board, then
perform this item again with SW1-1 ON. If the
problem is solved and you connect the
compressor again, turn SW1-1 OFF again.
Check the compressor’s coil resistance and
insulation resistance.
If the problem is not solved, replace the INV board.

-56-

5) Troubleshooting at breaker tripping

Check items
1 Check the breaker capacity.
2 Check the a short circuit or grounding in the electrical sys-

tem other than the inverter.

3 Check the resistance between terminals on the terminal

block TB1 for power source.

1 0 ~ several ohms or improper megohm value

4 Checking by powering again.

1 Main power source circuit breaker tripping

2 No display of remote controller

5 Operational check by operating air conditioner

1 Normal operation without breaker tripping.

2 Breaker tripping

Measures to be taken
The breaker’s capacity should be proper.
Correct any defects.

Check each part inside the inverter power circuit (re­sistance, megohm or the like).
a) Diode stack

Refer to "Troubleshooting of diode stack."

b) IPM

Refer to "Troubleshooting of IPM."
c) Rush current protection resistor
d) Electromagnetic contactor
e) DC reactor

✻

For c) ~ e), refer to "Individual Parts Failure Judge-

ment Methods."

a) As there is a possibility of instantaneous short cir-

cuit generated, find the mark of the short circuit for

repair.
b) When a) is not applicable, the compressor may be

faulty.
The ground fault of inverter output/compressor can be

supposed.
Disconnect the wiring to the compressor and check the
insulation resistance of the following parts with a
megger.
a) Compressor terminals.
b) Inverter output.

-57-

6) Individual Parts Failure Judgment Methods.

[Caution at replacement of inverter parts]

1 The IPM and G/A board should be replaced together at the same time.

2 Fully check wiring for incorrect and loose connection.

3 Coat the grease for radiation provided uniformly onto the radiation surface of IPM/diode modules.

Coat the grease for radiation on the full surface in a thin layer, and fix the module securely with the screw for fastening.
As the radiation grease attached on the wiring terminal causes poor contact, wipe it off if attached.

Part Name Judgment Method
Diode Stack (DS) Refer to “Judging Diode Stack Failure.” (P49)
Intelligent Power Module (IPM) Refer to “Judging IPM Failure.” (P49)
Electromagnetic Contactor (52C) Measure the resistance value at each terminal.

DC Reactor (DCL) Measure the resistance between terminals: 1Ω or lower

Measure the resistance between the terminals and the chassis:

∞

Cooling Fan (MF1) Measure the resistance between terminals: 0.1K~1.5KΩ
POWER board Measure the resistance valve at between each terminal, and between

each terminal and case.

Check Location Judgment Value

0-1 50~100kΩ

2-4 6-8

∞

10-12 14-16

Check Location Judgment Value

FN 3-6, FN 2-4

FN 1-2, FN 2-3,

FN4-6

FN1, FN2, FN3,

FN4, FN6-Case

Under 1Ω

∞
∞

When the IPM is damaged, the G/A board may possibly be broken, and the use of the broken G/A board damages
the normal IPM. Therefore, replace the IPM and G/A board together at the same time. However, if the G/A board is
damaged, judge that the IPM is faulty, then judge whether replacement is necessary or not

The incorrect or loose connection of the power circuit part wiring like IPM and diode module causes to damage the
IPM. Therefore, check the wiring fully. As the insufficient tightening of screws is difficult to find, tighten them
together additionally after finishing other works. For the wiring of the base for IPM, observe the wiring diagram
below carefully as it has many terminals.

-58-

Model PUHY-80TMU-A, 100TMU-A

To compressor

Red White Blue

Blue

Red

To capacitor (C1)

board

-59-

Check Code List

Check Code Check Content

0403 Serial transmission trouble
0900 Trial operation
1102 Discharge temperature trouble
1111 Low pressure saturation temperature sensor trouble (TH2)
1302 High pressure trouble
1500 Refrigerant volume charge trouble
1505 Suction pressure trouble
2500 Leakage (water) trouble
2502 Drain pump trouble
2503 Drain sensor trouble
4102 Lacking power source error
4103 Reverse phase error/Lacking power source error
4115 Power supply sync signal trouble
4116 Fan speed trouble (motor trouble)
4200 VDC sensor/circuit trouble
4220 Bus voltage trouble
4230 Radiator panel overheat protection
4240
4250 [1]

[11]

[6]

[13]

Overcurrent protectio
IPM Alarm output/Bus voltage abnormality

IAC sensor overcurrent abnormality

IAC sensor circuit/abnormality
IAC sensor miss-wiring abnormality

n

4260 Cooling fan trouble

Air inlet (TH21:IC)

5101

Discharge (TH1:OC)
Liquid pipe (TH22:IC)

5102

Low pressure saturation (TH2:OC)

5103

Gas pipe (TH23:IC)Thermal sensor
5105 trouble Liquid pipe (TH5)
5106 Ambient temperature (TH6)
5107 SC coil outlet (TH7)
5108 SC coil bypass outlet (TH8)
5110 Radiator panel (THHS)
5201 Pressure sensor trouble
5301

6600 Multiple address error
6602 Transmission processor hardware error
6603 Transmission circuit bus-busy error
6606 Communications with transmission processor error
6607 No ACK error
6608 No response error
7100 Total capacity error
7101 Capacity code error

-60-

Check Code Check Content

6606 Communications with transmission processor abnormality
6607 No ACK abnormality
6608 No response abnormality
6831 MA communication, No-reception error
6832 MA communication, Synchronization recovery error
6833 MA communication, Transmission/reception handware error
6834 MA communication, Start bit error
7100 Total capacity abnormality
7101 Capacity code abnormality
7102 Connected unit count over
7105 Address setting abnormality
7106 Characteristics setting abnormality
7111 Remote control sensor abnormality

Intermittent fault check code

Trouble Delay Cope Trouble Delay Content

1202 (1102)

Preliminary discharge temperature abnormality or preliminary discharge thermal sensor abnormality (TH1)
1205 Preliminary liquid pipe temperature sensor abnormality (TH5)
1211 (1111)

Preliminary low pressure saturation abnormality or preliminary low pressure saturation sensor abnormality (TH2)

1214 Preliminary THHS sensor/circuit abnormality
1216 Preliminary sub-cool coil outlet thermal sensor abnormality (TH7)
1217 Preliminary sub-cool coil bypass outlet thermal sensor abnormality (TH8)
1221 Preliminary ambient temperature thermal sensor abnormality (TH6)
1402 (1302) Preliminary high pressure abnormality or preliminary pressure sensor abnormality

1601

Preliminary 1600 (1500)
Preliminary lacked refrigerant abnormality

overcharged refrigerant abnormality

1605 (1505) Preliminary suction pressure abnormality

Preliminary serial transmission abnormality

4300 (5301) [6]

[9]

[13]

[1]

[11]

4300 (0403)

IAC sensor/circuit abnormality
IAC sensor miss-wiring abnormality

4320 (4220) Preliminary bus voltage abnormality

4310 Preliminary overcurrent breaking trouble

4330 (4230) Preliminary heat sink overheating abnormality
4340 (4240) Preliminary overload protection

4350 (4250) IPM Alarm output/Bus voltage abnormality

IAC sensor overcurrent abnormality

4360 (4260)

Please refer to ( ) : Check Code. [ ] : Error detail No.

Preliminary cooling fan abnormality

-61-

(1) Mechanical

Checking code Meaning, detecting method Cause Checking method & Countermeasure

Serial
transmission
trouble

Discharge
temperature
trouble

(

Outdoor unit

)

If serial transmission cannot be
established between the MAIN
and INV boards

1. When 140°C or more dis­charge temperature is de­tected during op-erations
(the first time), outdoor unit
stops once, mode is
changed to restart mode af­ter 3 minutes, then the out­door unit restarts.

2. When 140°C or more temp.
is detected again (the sec­ond time) within 30 minutes
after stop of outdoor unit, er­ror stop is observed with
code No. "1102" displayed.

3. When 140°C or more temp.
is detected 30 or more min­utes after stop of outdoor
unit, the stop is regarded as
the first time and the process
shown in 1 is observed.

4. 30 minutes after stop of out-

door unit is intermittent fault
check period with LED dis­played(1202).

Check 1, the connections, 2, contact
at the connectors and 3, for broken
wires in the following wiring.

CNRS2 - CNRS3
CNAC2 - TB1A

SW1-4 on the INV board should be
OFF.

If the fuse is melted, (if the resis­tance between the both ends of fuse
is ∞), replace the fuse.

If none of the items in 1) to 3) is ap­plicable, and if the trouble reappears
even after the power is switched on
again, replace the circuit board by
the following procedure (when re­placing the circuit board, be sure to
connect all the connectors, ground
wires, etc. securely).
1 If serial transmission is restored

after the INV board only is re­placed, then the INV board is de­fective.

2 If serial transmission is not re-

stored, reinstall the INV board
and replace the MAIN board. If
serial transmission is restored,
the MAIN board is defective.

3 If serial transmission is not re-

stored by 1 and 2 above, re-

place both boards.
See Refrigerant amount check.
Check operating conditions and op-

eration status of indoor/outdoor
units.

Check operation status by actually
performing cooling or heating opera­tions.

Cooling : Indoor LEV

LEV1

Heating : Indoor LEV

See Trouble check of LEV and so-
lenoid valve.

Confirm that ball valve is fully
opened.

Check outdoor fan.
See Trouble check of outdoor fan.

Check operation status of cooling or
heating.

See Trouble check of solenoid
valve.

Check resistance of thermistor
Check inlet temperature of sensor

with LED monitor.

0403

1102

1) Wiring is defective.

2) Switches are set wrong on the INV
board.

3) A fuse (F01) on the INV board is
defective.

4) The circuit board is defective.

1) Gas leak, gas shortage

2) Overload operations

3) Poor operations of indoor LEV

4) Poor operations of OC controller

LEV

Cooling : LEV1

5) Poor operations of ball valve

6) Outdoor unit fan block, motor

trouble, poor operations of fan
controller→Heating

3) ~ 6) : Rise in discharge
temp. by low pressure drawing

7) Gas leak between low and high

pressures
4-way valve trouble, compressor
trouble, solenoid valve SV1
trouble

8) Poor operations of solenoid valve

SV2
Bypass valve SV2 can not
control rise in discharge temp.

9

) Thermistor trouble

10

)Thermistor input circuit trouble on

control circuit board

[2] Self-diagnosis and Countermeasures Depending on the Check Code Displayed

-62-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

1.

2. When –40°C or less temp. is
detected again (the second
time) within 30 minutes after
stop of outdoor unit, error
stop is observed with code
Nos. "1111" or displayed.

3. When –40°C or less tem­perature is detected 30 or
more minutes after stop of
outdoor unit, the stop is re­garded as the first time and
the process shown in 1. is
observed.

4. 30 minutes after stop of out­door unit is intermittent fault
check period with LED dis­played.

Note:

1. Low press. saturation tem­perature trouble is not de­tected for 3 minutes after
compressor start, and fin­ish of defrosting opera­tions, and during defrost­ing operations.

2.In the case of short/open of
TH2 sensors before
starting of compressor or
within 10 minutes after
starting of compressor,
"1111" is displayed too.

Low
pressure
satura­tion
tempera­ture
sensor
trouble
(TH2)

1111 See Refrigerant amount check.

Check operating conditions andop­eration status of outdoor unit.

Check operation status by actually
performing cooling or heating opera­tions.

Cooling : indoor LEV

LEV1

Heating : indoor LEV

See Trouble check of LEV and so-
lenoid valve.

Confirm that ball valve is fully
opened.

Check indoor unit, and take measu­res to troube

Check outdoor unit, and take mea­sures to trouble

Check outdoor unit fan.
See Trouble check of outdoor unit
fan.

See Trouble check of solenoid
valve.

Check resistance of thermistor

See Trouble check of pressure
sensor.

Check inlet temp. and press. of sen­sor by LED monitor.

Low pressure saturation temperature trouble

1) Gas leak, Gas shortage

2) Insufficient load operations

3) Poor operations of indoor LEV

4) Poor operations of OC controller
LEV1.

Cooling : LEV1

5) Poor operations of ball valve

6) Short cycle of indoor unit

7) Clogging of indoor unit filter

8) Fall in air volume caused by dust
on indoor unit fan

9

) Dust on indoor unit heat exchanger

10

)Indoor unit block, Motor trouble

5)~10) : Fall in low press. caused
by lowered evaporating capacity in
cooling operation.

11

)Short cycle of outdoor unit

12

)Dust on outdoor heat exchanger

13

)Indoor unit fan block, motor trouble,

and poor operations of fan control­ler

10)~12) : Fall in low press. caus­ed by lowered evaporating capa­city in heating operation.

14

)Poor operations of solenoid valve

SV2
Bypass valve (SV2) can not
control low pressure drop.

15

)Thermistor trouble (TH2~TH6)

16

)Pressure sensor trouble

17

)Control circuit board thermistor

trouble and pressure sensor input
circuit trouble

18

)Poor mounting of thermistor

(TH2~TH6)

When saturation tempera­ture sensor (TH2) detects
–40°C or less (the first time)
during operations, out­door unit stops once,
mode is changed to restart
mode after 3 minutes, then
the outdoor unit restarts.

-63-

–1.5

Checking code Meaning, detecting method Cause Checking method & Countermeasure

Check operations status by actually
performing cooling or heating opera­tions.

Cooling : Indoor LEV

LEV1

Heating : Indoor LEV

See Trouble check of LEV and so-
lenoid valve.

Confirm that ball valve is fully open­ed.

Check indoor unit and take mea­sures to trouble.

Check outdoor unit and take mea­sures to trouble.

Check outdoor unit fan
See Trouble check of outdoor unit

fan.

See Trouble check of solenoid
valve.

Check resistance of thermistor.

Check Trouble check of pressure
sensor.

1. When press. sensor detects
28kg/cm

2

or more during op­erations (the first time), out­door unit stops once, mode
is changed to restart mode
after 3 minutes, then the out­door unit restarts.

2. When 30kg/cm

2

or more
pres- sure is detected again
(the second time) within 30
minutes after stop of outdoor
unit,error stop is observed
with code No. "1302" dis­played.

3. When 28kg/cm2 or more
pres-sure is detected 30 or
more minutes after stop of
outdoor unit, the detection is
regarded as the first time
and the process shown in 1
is observed.

4. 30 minutes after stop of out­door unit is intermittent fault
check period with LED dis­played.

5. Error stop is observed imme­diately when press. switch
(30

+ 0

kg/cm2) operates in

addition to pressure sensor.

1302

High pressure
trouble 1
(Outdoor unit)

1) Poor operations of indoor LEV

2) Poor operations of ball valve

3) Short cycle of indoor unit
4

) Clogging of indoor unit filter

5) Fall in air volume caused by dust
on indoor unit fan

6) Dust on indoor unit heat exchanger

7) Indoor unit fan block, motor trouble

2)~7) : Rise in high pressure
caused by lowered condensing
capacity in heating operation

8) Short cycle of outdoor unit

9

) Dust on outdoor unit heat ex-

changer

10

) Outdoor unit fan block, motor trou-

ble, poor operations of fan control­ler

8)~10) : Rise in high press. caus­ed by lowered condensing capa­city in cooling operation

11

)Poor operations of solenoid valves

SV1, 2 (Bypass valves (SV1, 2) can
not control rise in high pressure)

12

)Thermistor trouble (TH2, TH5, TH6)

13

) Pressure sensor trouble

-64-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

Check inlet temperature and press.
of sensor with LED monitor.

See Trouble check of pressure
sensor.

Once vacuum operation protection
is commenced, do not attempt to re­start until taking the measures be­low.
<Checking method>

• Check ball valve for neglecting to
open.

• Check extended piping for clog­ging when ball valve is opened.

• Check transmission line for erro­neous wiring. (Confirm the cor­rect wiring and piping connection
between indoor and outdoor
units by operating indoor unit one
by one.)

<Countermeasure>

• After checking with the above
method, make error reset by
power source reset.

• Then operate for 10~15-minutes
under the operation mode re­verse to that when the vacuum
operation protection occurred
(Heating if error occurred in cool­ing, while cooling if it occurred in
heating), and then enter into the
ordinary operation state.

When press. sensor detects
1kg/cm

2

or less just before
starting of operation, erro stop
is observed with code No.
"1302" displayed.

<Condition 1>

1. Judging that the state when

the suction pressure reaches
0kg/cm2G during compres­sor operation indicates high
pressure by the discharge
temperature and low pres­sure saturation temperature,
the back-up control by gas
bypassing will be conducted.

2. The outdoor unit once stops

entering into the 3-minutes
restart mode if the state of 1
continues for 3 minutes, and
restarts after 3 minutes.

3. After restarting, if the same

state as 1 continues within
30 minutes from the stopping
of 2, error stop will be com­menced displaying “1505”.

4. Ineffective if the compressor

operating time (integrated)
exceeds 60-minutes not de­tecting trouble.

High pressure
trouble 1
(Outdoor unit)

High pressure
trouble 2
(Outdoor unit)

Suction
pressure
trouble

16

)Control circuit board thermistor

trouble, press. sensor input cir­cuit trouble

17

)Poor mounting of thermistor

(TH2, TH5, H6)

18)Coming loose the connecter of
pressure switch or cut of the wire.

1) Fall in internal press. caused by
gas leak

2) Press. sensor trouble

3) Film breakage

4) Coming off of pin in connector
portion, poor contact

5) Broken wire

6) Press. sensor input circuit trouble
on control circuit board

• Operation while neglecting to
open ball valve. Especially for the
ball valve at low pressure side.
At cooling : Gas side ball valve
At heating : Liquid side ball
valve

• When plural systems are existing,
the low pressure abruptly drop at
indoor stopping by the erroneous
wiring of transmission line (differ­ent connection of transmission
line and refrigerant piping).

• Temporary vacuum condition due
to refrigerant distribution unbal­ance (insufficient refrigerant of
low pressure line) immediately af­ter charging refrigerant.

1302

1505

1500

1.

2.

3.

4.

5.

Overcharged
refrigerant
abnormality

1) Excessive refrigerant charge.

2)

Main circuit board thermistor
input circuit trouble

Thermistor mounting trouble
(TH1, TH2)

3)

Refer to the section on judging the
refrigerant volume.

Check the sensor detection
temperature and pressure with
the LED monitor.

If the discharge SH

<

=

10K is
detected during operation (at
first detection), the outdoor
unit stops at once. The 3­minute restart prevention
mode is entered. After three
minutes, the outdoor unit
starts up again.

If the discharge SH

<

=

10K is
detected again within 30
minutes after the outdoor unit
stops (second detection), an
abnormal stop is applied, and
"1500" is displayed.

If discharge SH

<

=

10K is
detected more than 30
minutes after the outdoor unit
stops, the state is the same
as the first detection and the
same operation as 1 above
takes place.

The abnormal stop delay
period is in effect for 30
minutes after the outdoor unit
stops. The abnormal stop
delay period LED turns ON
during this time.

If the abnormality detection
prohibit switch (SW2-4) is
ON, the same operation as
the first detection will apply
for the second and following
detections.

-65-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

Leakage
(water) trouble

Drain pump
trouble

Drain sensor
trouble

Water leak
trouble

Water
suspension
trouble

Operation of
float switch

Check water leaking of humidifier
and clogging of drain pan.

Check operations of drain pump.

Measure resistance of indirect
heater of drain sensor.
(Normal: Approx. 82Ω between 1–3
of CN50)

Indoor board trouble if no other
problems is detected.
Operate in fan mode checking to
make sure that the temperature of
TH2 and TH3 rise to the around the
same level.

Check resistance of thermistor

0°C:15kΩ 10°C : 9.7kΩ
20°C : 6.4kΩ 30°C : 4.3kΩ
40°C : 3.1kΩ

Check contact of connector
Indoor port trouble if no other prob­lem is detected.

Confirm water leaking section.

Confirm supply water volume.
Solenoid valve and connection
Confirm connector section.

Confirm connecting section.
Faulty float switch.

Turn power source OFF once, and
turn ON after thawaing.

Check drain pump operations
Check connect contact.
Check float switch operations.

2500

2502

2503

2600

2601

1) Water leak due to humidifier or the
like in trouble.

1) Drain sensor sinks in water be-

cause drain water level rises due to
drain water lifting-up mechanism
trouble.

2) Broken wire of indirect heater of

drain sensor

3) Detecting circuit (circuit board)

trouble
Indoor LEV operation is faulty.

4) The trable of indoor LEV

1) Thermistor trouble

2) Poor contact of connector

(insufficient insertion)

3) Full-broken of half-broken ther-

mistor wire

4) Indoor unit circuit board (detecting

circuit) trouble

Water leak from piping of humidifier

1) Water is not supplied to water tank

for humidifying.

2) The solenoid valve for humidifying

is set to OFF.

3) Disconnection of float switch.

4) Faulty operation of float switch.

5) Freezing of water tank.

1) Drain up input trouble

2) Poor contact of float switch circuit

3) Float switch trouble

When drain sensor detects
flooding during drain pump
OFF.

The drain sensor's water drain*
and after the drain pump is turn
on for more than three minuites.

✻

Drain sensor's water drain

condition when indirect heater
of drain after 40 second's.

• Rise in temperature of drain
sensor is 20 deg or less or

• The temperature of the
drain sensor is 63°C or less.

Short/open is detected during
drain pump operations. (Not de­tected when drain pump is not
operating.)
Short : 90°C or more detected
Open : –40°C or less de­tected

—

—

When Float switch operates
(point of contact : OFF), error
stop is observed with code No.
"2503" displayed.

-66-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

Open phase
error

Reverse
phase error

Check before the breaker, after the
breaker or at the power supply ter­minal blocks TB1, and if there is an
open phase, correct the connec­tions.

a) Check if a wire is disconnected.
b) Check the voltage between

each of the wires.

Check 1 the connections, 2, the con­tact at the connector, 3, the tighten­ing torque at screw tightening loca­tions and 4 for wiring disconnec­tions.
TB1~EN20
Refer to the circuit number and the
wiring diagram plate.

If F1, F2 or F3 on the MAIN board is
melted, (Resistance between both
ends of the fuse is ∞), replace the
fuses.

If none of the items in 1) to 4) is ap­plicable, and if the trouble reappears
even after the power is switched on
again, replace the MAIN board
(when replacing the circuit board, be
sure to connect all the connectors,
etc. securely).

If there is reverse phase before the
breaker, after the breaker or at the
power supply terminal blocks TB1,
reconnect the wiring.

Check before the breaker, after the
breaker or at the power supply ter­minal blocks TB1, and if there is an
open phase, correct the connec­tions.

a) Check if a wire is disconnected.
b) Check the voltage between

each of the wires.

Check 1 the connections, 2, the con­tact at the connector, 3, the tighten­ing torque at screw tightening loca­tions and 4 for wiring disconnec­tions.
TB1~EN20
Refer to the circuit number and the
wiring diagram plate.

If F1 or F2 or F3 on the MAIN board
is melted, (Resistance between both
ends of the fuse is ∞), replace the
fuses.

If none of the items in 1) to 4) is ap­plicable, and if the trouble reappears
even after the power is switched on
again, replace the MAIN board
(when replacing the circuit board, be
sure to connect all the connectors,
etc. securely).

4102

4103

1) Open phase has occurred in the
power supply (R, S, T).

2) The wiring is faulty.

3) The fuse is faulty.

4) The circuit board is faulty.

1) The phases of the power supply (R,
S, T) have been reversed.

2) Open phase has occurred in the
power supply (R, S, T).

3) The wiring is faulty.

4) The fuse is faulty.

5) The circuit board is faulty.

Open phase in the power sys­tem is being detected, so op­eration cannot be started.

Reverse phase (or open phase)
in the power system is being
detected, so operation cannot
be started.

-67-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

Power supply
sync signal
trouble

Fan speed
trouble (motor
trouble)

Check before the breaker, after the
breaker or at the power supply ter­minal blocks TB1 or TB1A, and if
there is an open phase, correct the
connections.

If the power supply voltage wave­form is distorted from a sine wave,
improve the power supply environ­ment.

If F1, F2 or F3 on the MAIN board,
or F3 is melted, (Resistance
between both ends of the fuse is ∞),
replace the fuses.

If none of the items in 1) to 3) is ap­plicable, and if the trouble reap­pears even after the power is
switched on again, replace the
MAIN board (when replacing the cir­cuit board, be sure to connect all the
connectors, ground wires, etc. se­curely).

• Confirm slipping off of connector
(CN33) on indoor controller
board.

• Confirm slipping off of connector
(FAN1) on indoor power board.

• Check wiring for disconnection.

• Check filter.

• Check indoor fan motor.

• When aboves have no trouble.

1) For trouble after operating fan.
Replace indoor controller board.
If not remedied, replace indoor
power board.

2) For trouble without operating fan.
Replace indoor power board.

4115

4116

1) There is an open phase in the
power supply (R, S, T)

2) The power supply voltage is dis­torted.

3) A fuse is defective.

4) The circuit board is defective.

1) Slipping off of fan speed detecting
connector (CN33) of indoor control­ler board

2) Slipping off of fan output connector
(FAN1) of indoor power board

3) Disconnection of fan speed detect­ing connector (CN33) of indoor
controller board, or that of fan out­put connector (FAN1) of indoor
powr board.

4) Filter cologging

5) Trouble of indoor fan motor

6) Faulty fan speed detecting circuit of
indoor controller board, or faulty fan
output circuit of indoor power
board.

The frequency cannot be deter­mined when the power is
switched on.
(The power supply’s frequency
cannot be detected. The out­door fan cannot be controlled
by phase control.)

(Detects only for PKFY-NAM)

1. Detecting fan speed below
180rpm or over 2000rpm
during fan operation at in­door unit (first detection) en­ters into the 3-minute restart
prevention mode to stop fan
for 30 seconds.

2. When detecting fan speed
below 180rpm or over
2000rpm again at fan return­ing after 30 seconsd from
fan stopping, error stop (fan
also stops) will be com­menced displaying 4116.

-68-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

1 If VDC 150 V is detected

just before the inverter
starts.

2 If VDC 400 V is detected

just before the inverter
starts.

3 If the voltage of the INV

board’s sensor circuit input is
what it should not normally
be.

VDCsensor/
circuit trouble

4200 • Check if an instantaneous power

failure or power failure, etc. has oc­curred.

• Check if the voltage is the rated
voltage value.

Check 1, the connections, 2, contact
at the connectors, 3 tightening
torque at screw tightened portions,
4, wiring polarities, 5, for broken
wires, and 6, for grounding in the fol­lowing wiring.

TB1 ~ DS ~ POWER Board ~ 52C
~ R1 ~ DCL~C1 ~ IPM ~ G/A
Board (F1) ~ CNDC1 ~ CNDC2
wiring

✻

Check if the wiring polarities are as
shown on the electric wiring dia­gram plate.

To judge failure of R1, go to “Indi­vidual Parts Failure Judgment Meth­ods.”

To judge failure of the 52C, go to
“Individual Parts Failure Judgment
Methods.”

To judge failure of the DS, go to “In­dividual Parts Failure Judgment
Methods.”

To judge failure of the DCL, go to
“Individual Parts Failure Judgment
Methods.”

If none of the items in 1) to 6) is ap­plicable, and if the trouble reappears
even after the power is switched on
again, replace the INV board, (when
replacing the circuit board, be sure
to connect all the connectors, etc.
securely)

1) Power supply voltage is abnormal.

2) The wiring is defective.

3) The rush current prevention resis­tors (R1) are defective.

4) The electromagnetic contactor
(52C) is defective.

5) The diode stack (DS) is defective.

6) The reactor (DCL) is defective.

7) The INV board is defective.

-69-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

If VDC

220 V is detected dur-

ing inverter operation.

If the cooling fan stays ON for 5
minutes or longer during in­verter operation, and if THHS

92°C is detected.

Bus voltage
trouble

Radiator
panel
overheat
protection

4220

4230

•Check if an instantaneous stop or
power failure, etc. has occurred.

•Check if the voltage is the rated
voltage value.

Check 1, the connections, 2, contact
at the connectors, 3 tightening
torque at screw tightened portions,
4, wiring polarities, 5, for broken
wires, and 6, for grounding in the fol­lowing wiring.

TB1 ~ DS ~ Power Board ~ 52C
~ R1 ~ DCL ~ C1 ~IPM ~ G/A
Board (F1) ~ CNDC1 ~ CNDC2
Wiring
CN15V1 ~ CN15V2 Wiring
CNDR1 ~ CNDR2 Wiring

✻

Check if the wiring polarities are as

shown on the wiring diagram plate.

To judge failure of R1, go to
“Individual Parts Failure Judgment
Methods.”

To judge failure of the 52C, go to
“Individual Parts Failure Judgment
Methods.”

To judge failure of the DS, go to “In­dividual Parts Failure Judgment
Methods.”

To judge failure of the DCL, go to
“Individual Parts Failure Judgment
Methods.”

•Check the wiring between the IPM
and the compressor.

•Check the compressor’s insulation
resistance.

Check the capacity of C1. (If
C1

<

=

3700 µF is defective)

If none of the items in 1) to 8) is ap­plicable, and if the trouble reappears
even after the power is switched on
again, replace the INV board (when
replacing the circuit board, be sure
to connect all the connectors,
ground wires, etc. securely).

Check 1 connections, 2 contact at
the connectors and 3 for broken
wires in the following wiring.

MF1~CNFAN

If the fuse is defective, replace the
fuse.

To judge failure of the MF1, go to
“Individual Parts Failure Judgment
Methods.”

To judge failure of the THHS, go to
error code “5110”.

If the air passage of the heat sink is
clogged, clear the air passage.

If none of the items in 1) to 5) is ap­plicable, and if the trouble reappears
even after the power is switched on
again, replace the INV board (when
replacing the circuit board, be sure
to connect all the connectors,
ground wires, etc. securely).

1) The power supply voltage is abnor­mal.

2) The wiring is defective.

3) The rush current prevention resis­tors (R1) are defective.

4) The electromagnetic contactor
(52C) is defective.

5) The diode stack (DS) is defective.

6) The reactor (DCL) is defective.

7) The inverter output is grounded.

8) The capacitor (C1) is defective

9) The circuit board is defective.

1) The wiring is defective.

2) The INV board fuse (F01) is defec­tive.

3) The cooling fan (MF1) is defective.

4) The THHS sensor is defective.

5) The air passage is clogged.

6) The INV board is defective.

-70-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

If IDC 103 A is detected con­tinuously for 10 minutes during
operation of the inverter after 5
or more seconds have passed
since the inverter started.

1) IPM/VDC trouble

2) If IDC

200 A is detected

during inverter operation.

3) If VDC

350V or VDC
190V is detected during in­verter operates.

Overcurrent
protection

Breaking of
overcurrent

4240

4250

Is the unit’s exhaust short cycling?
Clean the heat exchanger.
If the power supply voltage is less

than 198 V, it is outside specifications.
If the external air temperature is

over than 43°C it is outside the
specifications.

•Is the indoor unit capacity total ap­propriate?

•Are the outdoor/indoor unit capac­ity settings appropriate?

To judge failure of the THHS, go to
the item for error code “5110.”

To judge failure of the solenoid valve, go
to “Individual Parts Failure Judgment
Methods” for the “Solenoid Valve.”

Check 1 connections, 2 contact at
the connectors and 3 for broken
wires in the following wiring.

CNFAN1~MF1

Go to “Treating Fan Motor Related
Trouble.”

Go to “Treating Inverter/Compressor
Related Trouble.”

If none of the items in 1) to 10) is appli­cable, and if the trouble reappears even
after the power is switched on again, re­place the MAIN board (when replacing
the circuit board, be sure to connect all
the connectors, ground wires, etc. se­curely).

Go to the item for error code 4230,

4240.

•Check if an instantaneous power
failure or power failure, etc. has oc­curred.

•Check if the voltage is the rated
voltage value.

Check 1, the connections, 2, contact
at the connectors, 3 tightening
torque at screw tightened portions,
4, wiring polarities, 5, for broken
wires, and 6, for grounding in the fol­lowing wiring.

✻

Check if the wiring polarities are as

shown on the wiring diagram plate.

✻

Check the coil resistances and in­sulation resistance of the com­pressor.

Go to "Treatment of Inverter/Com­pressor Releated Trouble."

Go to the item for error code 4220.

1) Air passage Short Cycle

2) The heat exchanger is clogged.

3) Power Supply Voltage

4) External Air Temperature

5) Capacity Setting Error

6) The THHS sensor is defective.

7) The solenoid valves (SV1, 2) are
defective, or the solenoid valve
drive circuit is defective.

8) The wiring is defective.

9) Fan motor (MF) operation is defec­tive.

10)The inverter/compressor is defec-

tive.

11)The circuit board is defective.

1) Self protection by IPM break out,
(over current, over heat, under con­trol voltage)

1) The power supply voltage is abnor­mal.

2) The wiring is defective.

3) The inverter/compressor is defec­tive.

(the same as error code 4220)

-71-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

If the heat sink temperature
(THHS)

60°C for 10 minutes
or longer just before the inverter
starts.

If a heat sink temperature of
(THHS) 40°C is detected just
before starting of, and during
operation of the inverter.

•If IDC 20 A is detected just

before the inverter starts, or

•If IDC 10 A is detected dur-

ing inverter operation after 5
seconds has passed since the
inverter started when the INV
board’s SW1-1 is OFF.

Cooling fan
trouble

Radiator panel

IDC sensor/
circuit trouble

4260

5110

5301

Same as “4230.”

Judge that the THHS has failed. Go
to error code “5110.”

Check the contacts of CNTH on the
INV board.

If none of the items in 1) to 2) is ap­plicable, and if the trouble reap­pears even after the power is
switched on again, replace the INV
board (when replacing the circuit
board, be sure to connect all the
connectors, ground wires, etc. se­curely).

Check the contacts of CNCT on the
INV board.

Check the DCCT polarity.

•With SW1-1 OFF, is the inverter’s
output wiring open?

•With SW1-1 OFF, is a compressor
which is not specified for this model
connected to the inverter’s output?

If none of the items in 1) to 3) is ap­plicable, and if the trouble reap­pears even after the power is
switched on again, replace the INV
board and the DCCT (when replac­ing the circuit board, be sure to con­nect all the connectors, ground
wires, etc. securely) by the following
procedure.
1 Replace the INV board only. If it

recovers, the INV board is defec­tive.

2 If it does not recover, reinstall the

INV board and replace the DCCT.
If it recovers, the DCCT is defec-

tive.
If it does not recover after 1 and 2
above, both the INV board and the
DCCT are defective.

1) Same as “4230.”

1) The THHS Sensor is defective.

2) Contact is faulty.

3) The INV board is defective.

1) Contact is faulty.

2) The current sensor (DCCT) is con­nected with reverse polarity.

3) An error was made in the SW1-1
setting.

4) The INV board is defective. The
current sensor (DCCT) is defective.

-72-

Checking code Meaning, detecting method Cause Checking method & Countermeasure

<Other than THHS>
1 A short in the thermistor or

an open circuit was sensed.
The outdoor unit switches to
the temporary stop mode
with restarting after 3 min­utes, then if the temperature
detected by the thermistor
just before restarting is in the
normal range, restarting
takes place.

2 If a short or open circuit in

the thermistor is detected
just before restarting, error
code “5101”, “5102”, “5105”,

“5106”, "5107", “5108” or
“5109” i s d i s played.

3 In the 3 minute restart mode,

the abnormal stop delay LED
is displayed.

4 The above short or open cir-

cuit is not detected for 10
minutes after the compres­sor starts, or for 3 minutes
during defrosting or after re-

covery following defrosting.
<THHS>
If a heat sink (THHS) tempera­ture of

-40°C is detected just
after the inverter starts or during
inverter operation.

1 When pressue sensor de-

tects 1kg/cm2 or less during
operation, outdoor unit once
stops with 3 minutes restart­ing mode, and restarts if the
detected pressure of pres­sure sensor exceeds 1kg/
cm

2

imediately before re-

starting.

2 If the detected pressure of

sensor is less than 1kg/cm

2

immediately before restart­ing, error stop is com­menced displaying 5201.

3 Under 3 minutes restarting

mode, LED displays inter­mittent fault check.

4 During 3 minutes after com-

pressor start, defrosting and
3 minutes after defrosting
operations, trouble detec­tion is ignored.

Discharge
(TH1)

Low
pressure
saturation
(TH2)

Liquid
pipe (TH5)

Ambient
tempera­ture (TH6)

SC coil
outlet
(TH7)

SC coil
bypass
outlet
(TH8)

Radiator
panel
(THHS)

Pressure
sensor
trouble

5101

5102

5105

5106

5107

5108

5110

5201

Check the thermistor’s resistance.
Check if the lead wires are pinched.
Check for tearing of the insulation.
Check if a pin is missing on the con-

nector.
Check if a wire is disconnected.
Check the temperature picked up by

the sensor using the LED monitor.
If the deviation from the actual tem­perature is great, replace the MAIN
circuit board.
(In the case of the THHS, replace
the INV board.)

1) Thermistor

2) Lead wires are being pinched.

3) Insulation is torn.

4) A connector pin is missing, or there
is faulty contact.

5) A wire is disconnected.

6) The thermistor input circuit on the
MAIN circuit board is faulty.
(In the case of the THHS, replace
the INV board.)

Thermal Sensor Error, Outdoor Unit

Short Circuit Detection Open Circuit Detection

TH1 240°C or higher (0.57 kΩ)15°C or lower (321 kΩ)
TH2 70°C or higher (1.71 kΩ) -40°C or lower (399 kΩ)
TH3 70°C or higher (1.14 kΩ) -40°C or lower (130 kΩ)
TH4 70°C or higher (1.14 kΩ) -40°C or lower (130 kΩ)
TH5 110°C or higher (0.4 kΩ) -40°C or lower (130 kΩ)
TH6 110°C or higher (0.4 kΩ) -40°C or lower (130 kΩ)
TH7 70°C or higher (1.14 kΩ) -40°C or lower (130 kΩ)
TH8 110°C or higher (0.4 kΩ) -40°C or lower (130 kΩ)
THHS 100°C or higher (3.0 kΩ)-40°C or lower (2.5 kΩ)

1) Pressutre sensor trouble.

2) Inner pressure drop due to a leak-

age

3) Broken cover.

4) Coming off of pin at connector por-

tion, poor contact.

5) Broken wire

6) Faulty thermistor input circuit of

MAIN board.

See Troubleshooting of pressure

sensor.

-73-

Checking

code

Meaning, detecting method Cause Checking method & Countermeasure

6600

6602

Multiple address error

Transmission from units with
the same address is detected.

Note:

The address/attribute
shown on remote con­troller indica tes the con­troller which has de­tected error.

At the genration of 6600 error, release the error
by remote controller (with stop key) and start
again.
a) If the error occures again within 5 minutes

→ Search for the unit which has the same ad-

dress with that of the source of the trouble.

When the same address is found, turn off
the power source of outdoor unit, and in­door unit for 5 minutes or more after modify­ing the address, and then turn on it again.

b) When no trouble is generated even continuing

operation over 5 minutes

→ The transmission wave shape/noise on the

transmission line should be investigated in
accordance with <Investigation method of
transmission wave shape/noise>.

1) Two or more controllers of out­door unit, indoor unit, remote con­troller, etc. have the same ad­dress.

2) In the case that signal has
changed due to noise entered into
the transmission signal.

(2) Communication/system

Transmission processor
hardware error

Though transmission proces­sor intends to transmit "0", "1"
is displayed on transmission
line.

Note:

The address/attribute
shown on remote con­troller indicates the con­trol

ler which has detected

error.

1) At the collision of mutual transmission data generated during the wiring work or polarity
change of the transmission line of indoor or outdoor unit while turning the power source
on, the wave shape is changed and the error is detected.

2) 100V power source connection to indoor unit.

3) Ground fault of transmission line.

4) Insertion of power supply connector (CN40) of plural outdoor units at the grouping of
plural refrigerant systems.

5) Insertion of power supply connector (CN40) of plural outdoor units in the connection
system with MELANS.

6) Faulty controller of unit in trouble.

7) Change of transmission data due to the noise in transmission.

8) Connection system with plural refrigerant systems or MELANS for which voltage is not
applied on the transmission line for central control.

-74-

6602

Faulty controller of
generating unit

YES

YES

Erroneous power
source work

Erroneous transmission
work

NO

NO

YES

NO

NO

NO

YES

YES

YES

Transmission line

installed while turning

power source on?

Shut off the power source of outdoor/in­door units/BC controller and make it again.

Check power source of in­door unit.

187V ~ 253V?

Check transmission line
work and shield finish

Ground fault or shield

contacted with transmission

line?

System composition?

Single refrigerant system

Plural refrigerant system

Confirm supply power con­nector CN40 of outdoor unit

Only 1 set with
CN40 inserted?

Modification of CN40
insertion method

Investigation of trans­mission line noise

Noise exist?

Investigation of the
cause of noise

✻

For the investigation method, follow <Investigation

method of transmission wave shape/noise>.

Modification of
faulty point

Replace insertion
of CN40 to CN41

CN40 inserted?

Confirm supply power con­nector CN40 of outdoor unit

MELANS connected
system

Checking method and processing

6603

a) Check transmission wave shape/noise on

transmission line by following <Investigation
method of transmission wave shape/noise>.

→ No noise indicates faulty controller of generat-

ing unit.

→ Noise if existed, check the noise.

Transmission processor
hardware error

Transmission circuit bus­busy error

1Collision of data transmis-

sion:
Transmission can not be per­formed for 4~10 consecutive
minutes due to collision of
data transmission.

2Data can not be transmitted

on transmission line due to
noise for 4~10 consecutive
minutes.

Note:

The address/attribute
shown on remote con­troller indicates the con­troller which has de­tected error.

1) As the voltage of short frequency
like noise is mixed in transmission
line continuously, transmission
processor can not transmit.

2) Faulty controller of generating
unit.

Faulty controller of
generating unit

Checking

code

Meaning, detecting method Cause Checking method & Countermeasure

-75-

6606 Communications with

transmission processor
error

Communication trouble be­tween apparatus processor
and trans-mission processor.

Note:

The address/attribute
shown on remote con­troller indicates the con­troller which has de­tected error.

1) Data is not properly transmitted
due to casual errouneous opera­tion of the generating controller.

2) Faulty generating controller.

Turn off power sources of indoor unit and outdoor
unit.

When power sources are turned off sepa­rately, microcomputer is not reset and nor­mal operations can not be restored.

→ Controller trouble is the source of the trouble

when the same trouble is observed again.

Checking

code

Meaning, detecting method Cause Checking method & Countermeasure

-76-

Shut down OC unit power source, and
make it again.
It will return to normal state at an ac­cidental case.
When normal state can not be re­covered, check for the 1) ~ 4) of the
cause.

Shut down both OC and IC power so­urces simultaneously for 5 minutes or
more, and make them again.
It will return to normal state at an
accidental case.
When normal state can not be re­covered, check for the 1) ~ 5) of the
cause.

Shut down OC power sources for 5
minutes or more, and make it again.
It will return to normal state at an acci­dental case.
When normal state can not be re­covered, check for the 1) ~ 4) of the
cause.

Checking

code

Meaning, detecting method

6607

No ACK error

When no ACK signal is detected in 6 continuous times with 30 second interval by transmission
side controller, the transmission side detects error.

Note: The address/attribute shown on remote controller indicates the controller not

providing the answer (ACK).

Generating
unit address

Display
of trouble

Detecting
method

Cause Checking method & countermeasure

1) Poor contact of transmission line of OC or IC.

2) Damping of transmission line voltage/signal
by acceptable range of transmission wiring
exceeded.

Farthest : Less than 200m
Remote controller wiring: Less than 10m

3) Erroneous sizing of transmission line (Not
within the range below).
Wire diameter : 1.25mm2 or more

4) Faulty control circuit board of OC

1) When IC unit address is changed or modified
during operation.

2)

Faulty or slipping off of transmission wiring of IC

3) Slipping off of IC unit connector (CN2M)

4) Faulty IC unit controller

5) Faulty remote controller

1) Faulty transmission wiring at IC unit side

2) Faulty transmission wiring of RC

3) When remote controller address is changed
or modified during operation

4) Faulty remote controller

No reply
(ACK) at IC
transmission
to OC

No reply
(ACK) at
RC
transmission
to IC

No reply
(ACK) at IC
transmission
to RC

Remote

controller

(RC)

Remote

controller

(RC)

Remote

controller

(RC)

System
compo­sition

1 Outdoor

unit
(OC)

2 Indoor

unit (IC)

3 Remote

controller
(RC)

(1) Single refrigerant system

-77-

Checking

code

Meaning, detecting method

No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission

side controller, the transmission side detects error.

Note: The address/attribute shown on remote controller indicates the controller not

providing the answer (ACK).

Generating
unit address

Display
of trouble

Detecting
method

No reply
(ACK) at IC
transmission
to OC

No reply
(ACK) at
RC
transmission
to IC

No reply
(ACK) at IC
transmission
to RC

Remote

controller

(RC)

Remote

controller

(RC)

Remote

controller

(RC)

System
compo­sition

1 Outdoor

unit (OC)

2 Indoor

unit (IC)

3 Remote

controller
(RC)

6607

(continued)

(2) Group operation system using plural refrigerants

Same as measure for single refriger­ant system

a) Shut down the power source of

both IC and OC for over 5 minutes
simultaneously, and make them
again.
Normal state will be returned in­case of accidental trouble.
If it does not return to normal, follow
b).

b) Check for 1) ~ 5) of causes. If cause

is found, remedy it. If no cause is
found, follow c).

c) Check other remote controller or

OC unit LED for troubleshooting for
trouble.
Trouble → Modify the trouble ac-

cording to the con

tent

of check code.

No trouble→Faulty indoor controller

a) Shut down the power source of OC

for over 5 minute, and make it again.
Normal state will be returned in
case of accidental trouble.
If it does not return to normal, follow
b).

b) Check for 1) ~ 5) of causes. If cause

is found, remedy it. If no cause is
found, follow c).

c) Same as that of c) for IC unit

When normal state can not be ob­tained, check 1) ~ 5) of causes.

Cause Checking method & countermeasure

As same that for single refrigerant system

1) Cause of 1) ~ 5) of “Cause for single refriger­ant system”

2) Slipping off or short circuit of transmission
line of OC terminal block for centralized
control (TB7)

3) Shut down of OC unit power source of one re­frigerant system

4) Neglecting insertion of OC unit power supply
connector (CN40)

5) Inserting more than 2 sets of power supply
connector (CN40) for centralized control use.

For generation after normal operation conduct­ed once, the following causes can be consider­ed.

•Total capacity error (7100)

•Capacity code setting error (7101)

•Connecting set number error (7102)

•Address setting error (7105)

1) Cause of 1) ~ 3) of “Cause for single refri­gerant system”

2) Slipping off or short circuit of transmission
line of OC terminal block for centralized con­trol (TB7)

3) Shut down of OC unit power source of one
refrigerant system

4) Neglecting insertion of OC unit power supply
connector (CN40)

5) Inserting more than 2 sets of power supply
connector(CN40) for centralized control use

At generation after normal operation conducted
once, the following causes can be considered.

•Total capacity error (7100)

•Capacity code setting error (7101)

•Connecting set number error (7102)

•Address setting error (7105)

-78-

Checking

code

Meaning, detecting method

No ACK error

When no ACK signal is detected in 6 continuous times with 30 second interval by transmission
side controller, the transmission side detects error.

Note: The address/attribute shown on remote controller indicates the controller not

providing the answer (ACK).

Generating
unit address

Display of
trouble

Detecting
method

No reply
(ACK) at IC
transmission
to OC

No reply
(ACK) at
transmission
of SC to IC

No reply
(ACK) at
transmission
of IC to RC

No reply
(ACK) at
transmission
of MELANS
to RC

Remote

controller

(RC)

Remote

controller

(RC)

Remote

controller

(RC)

System
compo­sition

1 Outdoor

unit (OC)

2 Indoor

unit
(IC)

3 Remote

controller
(RC)

6607

(continued)

As same that for single refrigerant system

Trouble of partial IC units:

1) Same cause as that for single refrigerant
system

Trouble of all ICs in one refrigerant system:

1) Cause of total capacity error (7100)

2) Cause of capacity code setting error(7101)

3) Cause of connecting number error (7102)

4) Cause of address setting error (7105)

5) Slipping off or short circuit of transmission
line of OC unit terminal block for central
control (TB7)

6) Power source shut down of OC unit

7) Trouble of OC unit electrical system

Trouble of all ICs:

1) Cause of 1) ~ 7) of (b)

2) Insertion of power supply connector (CN40)
into OC unit transmission line for central­ized control

3) Slipping off or power source shut down of
power supply unit for transmission line

4) Faulty system controller (MELANS)

Same cause as that for plural refrigerant system

Trouble of partial IC units:

1) Same cause of that for single refrigerant
system

Trouble of all ICs in one refrigerant system:

1) Error detected by OC unit
Total capacity error (7100)
Capacity code setting error (7101)
Connecting number error (7102)
Address setting error (7105)

2) Slipping off or short circuit of transmission
line of OC unit terminal block for central
control (TB7)

3) Power source shut down of OC unit

4) Trouble of OC unit electrical system

Trouble of all ICs:

1) Cause of 1) ~ 7) of (b)

2) Insertion of power supply connector (CN40)
into OC unit transmission line for central­ized control

3) Slipping off or power shutdown of power
supply unit for transmission line

4) Faulty MELANS

Same countermeasure as that for
single refrigerant system

→ Same countermeasure as that for

single refrigerant system

Confirm OC trouble diagnosis LED

→At trouble generation, check for

the content according to check
code.

→At no trouble, follow b).

Check the content of 5)~7) shown
left.

Confirm voltage of transmission line
for centralized control

•More than 20V →Confirm

1) 2)

left.

•Less than 20V →Confirm 3) left.

Same countermeasure as that for plur­al refrigerant system

→ Same countermeasure as that for

single refrigerant system

Confirm OC trouble diagnosis LED

→ At trouble generation, check for

the content according to check
code.

→ At no trouble, follow (b).

Check the content of 2)~4) shown left.

Check the causes of 1) ~ 4) left.

(3) Connecting system with system controller (MELANS)

Cause Checking method & countermeasure

-79-

Checking

code

Meaning, detecting method

No ACK error

When no ACK signal is detected in 6 continuous times with 30 second interval by transmission
side controller, the transmission side detects error.

Note: The address/attribute shown on remote controller indicates the controller not

providing the answer (ACK).

Generating
unit address

Display of
trouble

Detecting
method

No reply
(ACK) at
transmission
of IC to SC

–

Remote

controller

(RC)

–

System
compo­sition

4 System

controller
(SC)

Address
which
should not
be exist-ed

6607

(continued)

Trouble of partial remote controller:

1) Faulty wiring of RC transmission line

2) Slipping off or poor contact of RC transmis-

sion connector.

3) Faulty RC

Trouble of all ICs in one refrigerant system

1) Error detected by OC unit

Total capacity error (7100)
Capacity code setting error (7101)
Connecting number error (7102)
Address setting error (7105)

2) Slipping off or short circuit of transmission

line of OC unit terminal block for central
control (TB7).

3) Power source shut down of OC unit

4) Trouble of OC unit electrical system

Trouble of all RC:

1) Cause of 1) ~ 7) of (b)

2) Inserting supply power connector (CN40)

to

OC transmission line for centralized control

3) Slipping off or power shutdown of power

supply unit for transmission line

4) Faulty MELANS

IC unit is keeping the memory of the original
group setting with RC although the RC ad­dress was changed later.
The same symptom will appear for the re­gistration with SC.

Check 1) ~ 3) left.

a) Confirm OC trouble diagnosis LED

→At trouble generation, check for

the content according to check
code.

→At no trouble, follow b).

b) Check the content of 2) ~ 4) shown

left.

Check the causes 1)~4) left.

As some IC units are keeping the me­mory of the address not existing,
delete the information.
Employ one of the deleting method
among two below.

1) Deletion by remote controller
Delete unnecessary information by
the manual setting function of re­mote controller.

2) Deletion by connecting inform­ation deleting switch of OC unit

Be careful that the use of this
method will delete all the group
information set with RC and all
the interlocking information of IC
unit.

1

Shut down OC unit power source,
and wait for 5 minutes.

2 Turn on the dip switch SW2-2

provided on OC unit control cir­cuit board.

3 Make OC unit power source, and

wait for 5 minutes.

4

Shut down OC unit power source,
and wait for 5 minutes.

5 Turn off the dip switch SW2-2

provided on OC unit control cir­cuit board.

6 Make OC unit power source.

(3) Connecting system with system controller (MELANS)

No relation with system

Cause Checking method & countermeasure

-80-

Checking

code

6608 1) At the collision of mutual transmis-

sion data when transmission
wiring is modified or the polarity is
changed while turning the power
source on, the wave shape
changes detecting error.

2) Repeating of transmission error
due to noise.

3) Damping of transmission line volt­age/signal due to exceeding of the
acceptable range for transmission
wiring.

•Farthest Less than 200m

•RC wiring Less than 12m

4) Damping of transmission voltage/
signal due to improper type of
trans-mission line.

• Wire size : More than 1.25mm

2

No response error

Though acknowledgement of
receipt (ACK) is received after
transmission, no response
command is returned.
Detected as error by transmis­sion side when the same symp­tom is re-peated 10 times with
an interval of
3 seconds

Note:

The address/attribute
shown on remote con­troller indicates the con­troller which has de­tected error.

a) Generation at test run

Turn off the power sources of OC unit, IC unit
and Fresh Master for more than 5 minutes
simultaneously, and make them again.
→ Returning to normal state means the

trouble detection due to transmission line
work while powering.

→ If generated again, follow b).

b) Check 3) and 4) of the causes left.

→ If cause is found, remedy it.
→ If cause is not found, follow c).

c) Investigate the transmission wave shape/

noise on transmission line according to
<Investigation method of transmission wave
shape/noise>.

Much possibility if 6602 is generated.

Meaning, detecting method Cause Checking method & Countermeasure

(3) System error

Checking

code

Meaning, detecting method Cause Checking method & Countermeasure

7100

7101

7102

Total capacity error

Total capacity of indoor units in
the same refrigerant system
exceeds limitations.

Trouble source:

Outdoor unit

Capacity code error

Error display at erroneous con­nection of Indoor unit of which
model name can not be con­nected

Trouble source :

Outdoor unit
Indoor unit

Connected unit count over

Number of units connected in
the same refrigerant system
exceeds limitations.

Trouble source:

Outdoor unit

1) Total capacity of indoor units in
the same refrigerant system ex­ceeds the following:

2) Erroneous setting of OC model

selector switch (SW3-10)

1) The Indoor unit model name

(model code) connected is not
connectable.

Connectable range...... 08~48

2) Erroneous setting of the switch

(SW2) for setting of model name
of Indoor unit connected.

1) Number of unit connected to ter-

minal block (TB3) for outdoor/in­door transmission line exceeds
limitations given be-lows:

Item Limitation

1 Total of 1~13 (80)

Indoor unit 1~16 (100)

2 Total of Indoor

unit & RC

1~35

a) Check for the model total (capacity cord total)

of indoor units connected.

b) Check whether indoor unit capacity code

(SW2) is wrongly set.
For erroneous switch setting, modify it, turn off

power source of outdoor unit, and indoor unit
simultaneously for 5 minutes or more to modify
the switch for setting the model name
(capacity coad).

Check for the model selector switch (Dip
switches SW3-10 on outdoor unit control circuit)
of OC.

a) Check for the model name of the Indoor unit

connected.

b) Check for the switch (SW2 if indoor controller

for setting of Indoor unit model name of
generating address. When it is not agreed to
the model name, modify the capacity code
while shutting off the power source of Indoor
unit.

* The capacity of Indoor unit can be confirmed

by the self-diagnosios function (SW1
operation) of Indoor unit.

a) Check whether the connection of units to the

terminal block for indoor/outdoor transmission
wiring (TB3) of outdoor unit is not exceeding
the limitation.

(See 1 ~ 2 left.)
b) Check for 2), 3), 4), left.
c) Check for the connection of transmission

wiring to the terminal block for centralized

control is erroneously connected to the indoor/

outdoor transmission wiring terminal block

(TB3).

Model Total capacity

PUHY-80 104

PUHY-100 130

12345678910

SW3

ON
OFF

.....

...

100
80

-81-

7102

7105

7111

Connected unit count over

Address setting error

•Erroneous setting of Outdoor
unit address

Trouble source : Outdoor unit

Remote control sensor error

Error not providing the tem­perature designed to remote
controller sensor.

Trouble source : Indoor unit

2) The Outdoor unit address is being
set to 51~100 under automatic
address mode (Remote controller
displays “HO”).

3) Slipping off of transmission wiring
at Outdoor unit.

4) Short circuit of transmission line in
case of 3) & 4), remote controller
displays “HO”.

1) Setting error of Outdoor unit ad­dress
The address of Outdoor unit is not
being set to 51~100.

1) In case when the old type remote
controller for M-NET is used and
the remote controller sensor is de­signed on indoor unit. (SW1-1
turned ON)

a) Check for the model total (capacity code total)

of indoor units connected.

Check that the address of Outdoor unit is being
set to 51~100.
Reset the address if it stays out of the range,
while shutting the power source off.

a) Replace the old remote controller by the new

remote controller.

Checking

code

Meaning, detecting method Cause Checking method & Countermeasure

-82-

0

1

2

3
4
5
6

7

8

9

10

11

12

13

14
15

16

17

18

19

20

0000000000

1000000000

0100000000

1100000000
0010000000
1010000000
0110000000

1110000000

0001000000

1001000000

0101000000

1101000000

0011000000

1011000000

0111000000
1111000000

0000100000

1000100000

0100100000

1100100000

0010100000

[3] LED Monitor Display

E: E2 Contents stored in the E2PROM; M: Monitored by the IC through communications; E*: Stored in service memory.

COMP
Operat­ing

Unit
No. 1

Unit
No. 9

Unit
No. 1

Unit
No. 9

Unit
No. 1

Unit
No. 9

Permissible
Stop

Cooling
Refrigerant
Recovery

High
Pressure
Error 1, 2

Suction
Pressure
Error

TH1
Error

TH7
Error

No SW1 Item Display Remarks

12345678910 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

Relay Output
Display 1 (Lights
up to display)

Check Display 1
OC Error

Relay Output
Display 2

Check Display 2
(Including the IC)

Outdoor Unit
Operation Display

Indoor Unit Check

Indoor Unit
Operation Mode

Indoor Unit
Thermostat

Outdoor Unit
Operation Mode

Outdoor Unit
Control Mode

Error Delay in
Outdoor Unit

Crank­case
Heater

Packet
being
sent

Unit
No. 2

Unit
No. 10

Unit
No. 2

Unit
No. 10

Unit
No. 2

Unit
No. 10

Standby

Configuration
Detection
Error

TH2
Error

TH8
Error

21S4

✻

3 minutes,
restart

Unit
No. 3

Unit
No. 11

Unit
No. 3

Unit
No. 11

Unit
No. 3

Unit
No. 11

Defrost­ing

Heating
Refrigerant
Recovery

Outlet
Tempera­ture Error

SV1

Compres­sor
operating

Unit
No. 4

Unit
No. 12

Unit
No. 4

Unit
No. 12

Unit
No. 4

Unit
No. 12

Cooling

Overcurrent
Protection

Reverse
Phase, Open
Phase Error

SV2

Prelimi­nary
Error

Unit
No. 5

Unit
No. 13

Unit
No. 5

Unit
No. 13

Unit
No. 5

Unit
No. 13

Cooling
High Oil
Recovery

Heat Sink
Thermostat
Operating

TH5
Error

Lights for
Normal
Operation

Unit
No. 8

Unit
No. 16

Unit
No. 8

Unit
No. 16

Unit
No. 8

Unit
No. 16

Heating
Low Oil
Recovery

Refrigerant
Over­charge

THHS
Error

LD8 is a relay output indicator which
lights u at all times when the
microcomputer’s power is ON.
When sending of a monitoring re­quest to IC/BC is terminated, if there
is no error, “- - - -” is displayed. E

✻

*only for PUHY
E

✻

If there is no error,
“- - - -” is displayed. E

✻

E

✻

E

✻

Lights up if an abnormal stop
has occurred in the IC. The
indicator for Unit No. 1 goes off
when error reset is carried out
from the smallest address. M

Lights up during
cooling.
Blinks during heating.
Goes off during stop
and blower operation. M

Lights up when
thermostat is ON.
Goes off when
thermostat is OFF.
M

E

✻

The flag correspond­ing to the item where
there is an error
delay lights up. E

✻

0 ~ 9999

Address and error code reversed

SSR

Unit
No. 7

Unit
No. 15

Unit
No. 7

Unit
No. 15

Unit
No. 7

Unit
No. 15

Heating
High Oil
Recovery

INV
Error

HPS
Error

0 ~ 9999

Address and error code reversed

Error

Unit
No. 6

Unit
No.14

Unit
No. 6

Unit
No.14

Unit
No. 6

Unit
No.14

Heating

Cooling
Low Oil
Recovery

Overcurrent
Break

TH6
Error

-83-

21

22

23

24

25

26

27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

46
47
48
49
50
51

1010100000

0110100000

1110100000

0001100000

1001100000

0101100000

1101100000
0011100000
1011100000
0111100000
1111100000
0000010000
1000010000
0100010000
1100010000
0010010000
1010010000
0110010000
1110010000
0001010000
1001010000
0101010000
1101010000
0011010000
1011010000

0111010000
1111010000
0000110000
1000110000
0100110000
1100110000

High
Pressure
Error 1, 2

Suction
Pressure
Error

TH1
Error

TH7
Error

No SW1 Item Display Remarks

12345678910 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

Outdoor Unit
Preliminary Error
History

Error History 1

Inverter Error Detail

Error History 2
Inverter Error Detail
Error History 3
Inverter Error Detail
Error History 4
Inverter Error Detail
Error History 5
Inverter Error Detail
Error History 6
Inverter Error Detail
Error History 7
Inverter Error Detail
Error History 8
Inverter Error Detail
Error History 9
Inverter Error Detail
Error History 10
Inverter Error Detail
Type of Prelimi-

nary Inverter Error

(Details of the inverter
error in No. 17)

TH1 Data
TH2 Data

TH5 Data
TH6 Data

Low
Pressure
Error

Configuration
Detection
Error

TH2
Error

TH8
Error

Outlet
Tempera­ture Error

Overcur­rent
Protection

Reverse
Phase, Open
Phase Error

Heat Sink
Thermostat
Operation

TH5
Error

Refrigerant
Over­charge

THHS
Error

HPS
Error

Overcur­rent
Break

TH6
Error

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

Inverter Error Detail (1 ~ 9)

0 ~ 9999

-99.9 ~ 999.9

-99.9 ~ 999.9

↑

↑

Lights up if an error
delay has occurred
between the time the
power was turned on
and the present time.
To turn the indicators
off, switch the power
OFF briefly.
E

✻

The error and error
delay code are
displayed. If the
address and error
code are shown in
reverse, or there is
no error, “- - - -” is
displayed. E

If there is no error, “-

- - -” is displayed. E
E

If there is no error,
“- - - - ” is always
overwritten.

E

✻

E

✻

No. 52 THHS
data are
monitored by
the inverter
microcomputer.

-84-

52
53
54
55
56
57
58
59
60

61

62

63
64
65

66

67
68
69
70

71

72
73
74
75
76
77
78
79
80
81
82
83
84
85
86

0010110000
1010110000
0110110000
1110110000
0001110000
1001110000
0101110000
1101110000

00111100

10111100

01111100

11111100
00000010
10000010

01000010

11000010
00100010
10100010
01100010

11100010

00010010
10010010
01010010
11010010
00110010
10110010
01110010
11110010
00001010
10001010
01001010
11001010
00101010
10101010
01101010

∆ Hz

–

Low

-3 deg.
or less

Low

-3 deg.
or less

No SW1 Item Display Remarks

12345678910 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

THHS Data
HPS Data
TH7 Data
TH8 Data

Accumulator Level
Change in Hz AK

Difference from
target TC

Difference from
target ET

Target TC
Target ET
Temporary

requency
Compressor

output frequency
AK
SLEV
LEV1
Fan controller

output value

DC buss current

OC address
IC1 address
IC2 address
IC3 address
IC4 address
IC5 address
IC6 address
IC7 address
IC8 address
IC9 address
IC10 address
IC11 address
IC12 address
IC13 address

∆ Hz

0

Low

-3 ~ -2
deg.

Low

-3 ~ -2
deg.

∆ Hz

+

Low

-2 ~ -1
deg.

Low

-2 ~ -1
deg.

–– ∆ AK

+

High 3
deg. or
more

High 3
deg. or
more

∆ AK

0

High
2~3
deg.

High
2~3
deg.

∆ AK

–

High
1~2
deg.

High
1~2
deg.

-99.9 ~ 999.9

↑
↑
↑

0~9 (“AL=” is also displayed)

E

✻

Actual frequency out­put from inverter

Display fan controller
output value used for
control.

Stable region

Stable region

-99.9 ~ 999.9

↑

0 ~ 9999

↑

↑
↑
↑

0000 ~ 9999

-99.9 ~ 999.9

0000 ~ 9999

↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑

0000 ~ 9999

-85-

87
88
89
90

91
92

93

94

95
96
97
98

99
100
101

102
103
104
105
106

107
108
109
110

111

112
113
114
115
116

11101010
00011010
10011010
01011010

11011010
00111010

10111010

01111010

11111010
00000110
10000110
01000110
11000110
00100110
10100110

01100110
11100110
00010110
10010110
01010110

11010110
00110110
10110110
01110110

11110110

00001110
10001110
01001110
11001110
00101110

No SW1 Item Display Remarks

12345678910 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

IC14 address
IC15 address
IC16 address
Compressor

operat-

ion hour

upper 4 digits
Lower 4 digits
OC operation

mode

OC operation
mode

Relay output
display 1 Lighting
display

TH1 data
TH2 data

TH5 data
TH6 data
Pressure sensor

data
THHS data
TH7 datata
TH8 data

Compressor output
frequency

AK
SLEV
LEV1
Compressor

operating current
OC operation

display

IC1 inlet temperature
IC2 inlet temperature
IC3 inlet temperature
IC4 inlet temperature
IC5 inlet temperature

↑

0000 ~ 9999

↑
↑

↑

When there is an error stop with No92-111, the data on error stops or the data immediately before the error postponement stop, which is
stored in service memory, are displayed.

Permitted
mode
stop

Cooling
Refrigerant
recovery

Com­pressor
operation

Standby

52C

Defrost

Heating
Refrigerant
recovery

21S4

Cooling

SV1

Heating

Cooling
Low oil
recovery

SV4

Cooling
High oil
recovery

Heating
High oil
recovery

Heating
Low oil
recovery

-99.9 ~ 999.9

-99.9 ~ 999.9

↑

↑
↑

↑
↑
↑

0 ~ 9999

↑
↑
↑

-99.9 ~ 999.9

In
forcible
powering

3­minute
restart

Compres­sor
Operating

I

ntermit­tent fault
check

Trouble

-99.9 ~ 999.9

↑
↑
↑
↑

No.92-111 display
the data immediately
before error stop or
error intermittent foult
stop.

-86-

10101110
01101110
11101110
00011110
10011110
01011110
11011110
00111110
10111110
01111110
11111110
00000001
10000001
01000001
11000001
00100001
10100001
01100001
11100001
00010001
10010001
01010001
11010001
00110001
10110001
01110001
11110001
00001001
10001001
01001001
11001001
00101001
10101001
01101001
11101001
00011001
10011001
01011001

No SW1 Item Display Remarks

12345678910 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

IC6 inlet temperature
IC7 inlet temperature
IC8 inlet temperature
IC9 inlet temperature
IC10 inlet temperature
IC11 inlet temperature
IC12 inlet temperature.
IC13 inlet temperature
IC14 inlet temperature
IC15 inlet temperature
IC16 inlet temperature
IC1 liquid piping temp.
IC2 liquid piping temp.
IC3 liquid piping temp.
IC4 liquid piping temp.
IC5 liquid piping temp.
IC6 liquid piping temp.
IC7 liquid piping temp.
IC8 liquid piping temp.
IC9 liquid piping temp.
IC10 liquid piping temp.
IC11 liquid piping temp.
IC12 liquid piping temp.
IC13 liquid pipe temp.
IC14 liquid piping temp.
IC15 liquid piping temp.
IC16 liquid piping temp.
IC1 gas piping temp.
IC2 gas piping temp.
IC3 gas piping temp.
IC4 gas piping temp.
IC5 gas piping temp.
IC6 gas piping temp.
IC7 gas piping temp.
IC8 gas piping temp.
IC9 gas piping temp.
IC10 gas piping temp.
IC11 gas piping temp.

117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154

-99.9 ~ 999.9

↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑

-87-

155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193

11011001
00111001
10111001
01111001
11111001
00000101
10000101
01000101
11000101
00100101

10100101
01100101
11100101
00010101
10010101
01010101
11010101
00110101
10110101
01110101
11110101
00001101
10001101
01001101
11001101
00101101
10101101
01101101
11101101
00011101
10011101
01011101
11011101
00111101
10111101
01111101
11111101
00000011
10000011

No SW1 Item Display Remarks

12345678910 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

IC12 gas piping temp.
IC13 gas piping temp.
IC14 gas piping temp.
IC15 gas piping temp.
IC16 gas piping temp.
IC1SH
IC2SH
IC3SH
IC4SH
IC5SH
IC6SH
IC7SH
IC8SH
IC9SH
IC10SH
IC11SH
IC12SH
IC13SH
IC14SH
IC15SH
IC16SH
IC1SC
IC2SC
IC3SC
IC4SC
IC5SC
IC6SC
IC7SC
IC8SC
IC9SC
IC10SC
IC11SC
IC12SC
IC13SC
IC14SC
IC15SC
IC16SC
IC1 LEV Opening
IC2 LEV Opening

-99.9 ~ 999.9

↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑

↑

-88-

194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231

01000011
11000011
00100011
10100011
01100011
11100011
00010011
10010011
01010011
11010011
00110011
10110011
01110011
11110011
00001011
10001011
01001011
11001011
00101011
10101011
01101011
11101011
00011011
10011011
01011011
11011011
00111011
10111011
01111011
11111011
00000111
10000111
01000111
11000111
00100111
10100111
01100111
11100111

No SW1 Item Display Remarks

12345678910 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

IC3 LEV Opening
IC4 LEV Opening
IC5 LEV Opening
IC6 LEV Opening
IC7 LEV Opening
IC8 LEV Opening
IC9 LEV Opening
IC10 LEV Opening
IC11 LEV Opening
IC12 LEV Opening
IC13 LEV Opening
IC14 LEV Opening Angle
IC15 LEV Opening
IC16 LEV Opening
IC1 operation mode
IC2 operation mode
IC3 operation mode
IC4 operation mode
IC5 operation mode
IC6 operation mode
IC7 operation mode
IC8 operation mode
IC9 operation mode
IC10 operation mode
IC11 operation mode
IC12 operation mode
IC13 operation mode
IC14 operation mode
IC15 operation mode
IC16 operation mode
IC1 capacity code
IC2 capacity code
IC3 capacity code
IC4 capacity code
IC5 capacity code
IC6 capacity code
IC7 capacity code
IC8 capacity code

-99.9 ~ 999.9

↑
↑
↑
↑
↑
↑

↑
↑
↑
↑

↑
↑
↑

0: Stopped
1: Fan
2: Cooling
3: Heating
4: Dry

0000 ~ 9999

↑
↑
↑
↑
↑
↑
↑

-89-

232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255

00010111
10010111
01010111
11010111
00110111
10110111
01110111
11110111
00001111
10001111
01001111
11001111
00101111
10101111
01101111
11101111
00011111
10011111
01011111
11011111
00111111
10111111
01111111
11111111

No SW1 Item Display Remarks

12345678910 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8

IC9 capacity code
IC10 capacity code
IC11 capacity code
IC12 capacity code
IC13 capacity code
IC14 capacity code
IC15 capacity code
IC16 capacity code
IC1 filter
IC2 filter
IC3 filter
IC4 filter
IC5 filter
IC6 filter
IC7 filter
IC8 filter
IC9 filter
IC10 filter
IC11 filter
IC12 filter
IC13 filter
IC14 filter
IC15 filter
IC16 filter

0000 ~ 9999

↑
↑
↑
↑
↑
↑
↑

↑

-99.9 ~ 999.9

↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑

-90-

AIR CONDITIONERS CITY MULTI Series Y

Models PUHY-80TMU-A, 100TMU-A

Service Handbook

Service Handbook PUHY-80TMU-A, 100TMU-A

Issued in March 2004

New publication effective March 2004.

Specifications subject to change without notice.

3400 Lawrenceville Suwanee Road ● Suwanee, Georgia 30024

Toll Free: 800-433-4822 ● Toll Free Fax: [phone]

www.mrslim.com

Specifications are subject to change without notice.