Fujitsu AirStage AB12, AirStage AB24, AirStage AB14, AirStage AB18, AirStage AB30 Service Manual

R407C

Variable Refrigerant Flow System

Multi Air Conditioning System for Buildings

HEAT RECOVERY TYPE

Model : AO90

SERVICE MANUAL

Multi Air Conditioning System

for Buildings

SERVICE MANUAL

Variable Refrigerant Flow System

R407C

CONTENTS

1. TEST RUN

1-4 TEST RUN CONTROL................................................................................................

1-3-1 TEST RUN FROM OUTDOOR PC BOARD........................................................

2-2 MICROPROCESSOR FUNCTION LIST.....................................................................

2-1 PCB LAYOUTS...........................................................................................................

2. FUNCTION OF PRINTED CIRCUIT BOARD

3-1-3 3 MINUTES RESTART PREVENTION (3MIN ST)..............................................

3-1-2 COMPRESSOR OUTPUT PATTERN ................................................................

3-1-1 OPERATION / STOP CONDITION......................................................................

3-1 COMPRESSOR OPERATION CONTROL..................................................................

1-2 CHECK ITEM DURING TEST RUN............................................................................

1-1 CHECK ITEMS BEFORE TEST RUN.........................................................................

2-1-2 INDOOR UNIT CONTROL CIRCUIT BOARD

2-1-1 INDOOR UNIT CONTROL CIRCUIT BOARD.....................................................

2-1-3 OUTDOOR UNIT CONTROL CIRCUIT BOARD................................................. 02-03

WIRED REMOTE CONTROLLER, SIMPLE REMOTE CONTROLLER

CIRCUIT BOARD.................................................................................................

1-3-2 TEST RUN FROM REMOTE CONTROLLER.....................................................

2-1-4

2-2-1 INDOOR UNIT.....................................................................................................

2-2-2 OUTDOOR UNIT.................................................................................................

2-3 FUNCTION AND SETTING OF EACH SWITCH........................................................

2-3-1 INDOOR UNIT(EXCEPT FOR COMPACT WALL MOUNTED TYPE..................

2-3-2 INDOOR UNIT(COMPACT WALL MOUNTED TYPE).........................................

2-3-3 OUTDOOR UNIT..................................................................................................

2-3-4 WIRED, SIMPLE REMOTE CONTROLLER........................................................

2-4 EXTERNAL INPUT & OUTPUT..................................................................................

2-4-1 INDOOR UNIT(EXCEPT FOR COMPACT WALL MOUNTED TYPE).................

2-4-2 INDOOR UNIT(COMPACT WALL MOUNTED)...................................................

.2-4-3 OUTDOOR UNIT..................................................................................................

3. OUTDOOR UNIT OPERATION CONTROL

3-1-4 COMPRESSOR RECOVERY OPERATION........................................................

3-2 HEAT EXCHANGE CAPACITY CONTROL................................................................

3-3 OUTDOOR FAN MOTOR CONTROL........................................................................

01-01
01-02

1-3 TEST RUN METHOD.................................................................................................. 01-03

01-03
01-03
01-05

02-01

02-01

02-04

02-08

02-08

02-11

02-12

02-12

02-16

02-19

02-22

02-28

02-28

02-30

02-31

03-01
03-01
03-01
03-01
03-02
03-03
03-04

2-1-5 CENTRAL REMOTE CONTROLLER CIRCUIT BOARD......................................

02-05

2-3-5 CENTRAL REMOTE CONTROLLER.................................................................. 02-24

2-4-4 CENTRAL REMOTE CONTROLLER / PC CONTROLLER.................................

02-32

(COMPACT WALL MOUNTED TYPE)................................................................. 02-02

2-1-6 NETWORK CONVERTORS' CIRCUIT BOARD....................................................

02-06

2-3-6 NETWORK CONVERTOR.................................................................................. 02-26

2-4-5 NETWORK CONVERTOR...................................................................................

02-34

3-10 PROTECTION FUNCTIONS......................................................................................

4. INDOOR UNIT OPERATION

3-9 OIL RECOVERY CONTROL......................................................................................

03-11

04-01

03-10

5. TROUBLESHOOTING

4-1 TIMER CONTROL......................................................................................................

4-2 FAN CONTROL..........................................................................................................

4-2-1 "AUTO" POSITION..............................................................................................

4-2-2 "LOW", "MED" AND "HIGH" POSITION..............................................................

4-3 MASTER CONTROL..................................................................................................

4-3-1 OPERATION MODE CONTROL..........................................................................

4-3-2 AUTO CHANGEOVER.........................................................................................

4-3-3 "COOL" POSITION..............................................................................................

4-3-4 "HEAT" POSITION...............................................................................................

4-3-5 "FAN" POSITION.................................................................................................

4-4 LOUVER CONTROL..................................................................................................

4-5 ENERGY SAVE OPERATION...................................................................................

4-6 ANTI FREEZE CONTROL.........................................................................................

4-7 ELECTRONIC EXPANSION VALVE CONTROL.......................................................

5-1 INDOOR UNIT............................................................................................................

5-1-1 NORMAL OPERATION DISPLAY.......................................................................

5-1-2 ABNORMAL OPERATION DISPLAY...................................................................

5-2 OUTDOOR UNIT........................................................................................................

5-2-1 NORMAL OPERATING DISPLAY........................................................................

5-2-2 ABNORMAL OPERATION DISPLAY...................................................................

5-3 REMOTE CONTROLLER...........................................................................................

5-5 ERROR CODE & TROUBLESHOOTING...................................................................

5-5-1 TROUBLE SHOOTING WITH ERROR CODE....................................................

6. APPENDING DATA 1 (INSTALLATION)

6-1 ADDITIONAL CHARGE..............................................................................................

6-2 ADDRESS SETTING..................................................................................................

5-5-2 TROUBLE SHOOTING WITH NO ERROR CODE..............................................

04-06
04-06
04-06
04-07
04-07
04-08
04-09
04-09
04-09
04-10
04-13

04-14
04-15

05-01
05-01

05-03
05-03
05-04

5-3-1 WIRED REMOTE CONTROLLER....................................................................... 05-05

5-3-2 SIMPLE REMOTE CONTROLLER...................................................................... 05-05

5-3-3 CENTRAL REMOTE CONTROLLER.................................................................. 05-06

05-05

05-10
05-10
05-36

05-02

06-01
06-02

5-4 NETWORK CONVERTOR.........................................................................................

05-09

5-6 CASE SUCH AS THESE ARE NORMAL...................................................................

05-46

3-4 EXPANSION VALVES 1 AND 2 CONTROL...............................................................

3-5 CIRCULATING SAVE AMOUNT CONTROL..............................................................

3-6 SOLENOID VALVE 2 CONTROL...............................................................................

3-7 DEFROSTING CONTROL..........................................................................................

3-8 OIL RETURN CONTROL............................................................................................

03-06
03-07
03-07
03-08
03-09

4-8 AUTO RESTART........................................................................................................

4-9 DRAIN PUMP OPERATION.......................................................................................

04-15
04-15

7-1 REFRIGERANT PIPE SYSTEM DIAGRAM................................................................

7-3-1 INDOOR UNIT......................................................................................................

7-3-2 OUTDOOR UNIT..................................................................................................

7. APPENDING DATA 1 (UNIT)

7-2 CHARACTERISTICS OF SENSORS..........................................................................

7-2-1 THRMISTOR.........................................................................................................

7-2-2 PRESSURE SENSOR..........................................................................................

7-3 WIRING DIAGRAM.....................................................................................................

7-4 OUTDOOR INTERNAL LAYOUT................................................................................

07-01
07-02
07-02
07-04

07-06
07-06
07-18
07-19

6-2-1 KINDS OF ADDRESS AND SETTING RANGE....................................................

6-2-2 ADDRESS SETTING FOR COMPACT WALL MOUNTED

TYPE INDOOR UNIT.............................................................................................

6-3 PUMP DOWN METHOD.............................................................................................

6-3-1 START AND STOP OF THE PUMP DOWN.........................................................

6-4 TOOLS........................................................................................................................

06-02

06-04

06-09

06-09

6-3-2 A FLOW CHART OF PUMP DOWN.....................................................................

06-09

06-10

6-5 PRECAUTIONS FOR INSTALLATION.......................................................................

06-11

7-5 MODEL DESIGNATION ..............................................................................................

07-20

6-2-3 EXAMPLES OF SYSTEM SETTING.....................................................................

06-05

6-6 PRECAUTIONS FOR SERVICING.............................................................................

6-7 IN USE OF THE NEW REFRIGERANT R407C..........................................................

06-13

06-14

6-7-1 WHAT IS CFC/HCFC/HFC ?.................................................................................

6-7-2 CHARACTERISTICS OF R22 AND R407C..........................................................

06-14

06-14

6-7-3 DEFFERENCE FROM CONVENTIONAL MODEL(R22) AND PRECAUTIONS...

06-15

7-2-3 ELECTRIC EXPANSION VALVE..........................................................................

7-2-4 RB UNIT................................................................................................................

7-2-5 OTHERS...............................................................................................................

07-04
07-04
07-05

1 . TEST RUN

TM

R407C

Outdoor

unit

3 4W 50Hz 380 - 415V

1 50Hz
220 - 240V

Transmission line

Indoor

unit

1

13

9

10

9

10

1

14

15 16

12

13

14

2

4

3 5 6

15

16 17 18

21

Central

remote controller

Wired

remote controller

Before test run, check the following items.

Is the selection of the outdoor unit and the indoor units correct?
(Check the number of connected indoor units, total capacity of the indoor units)
Is the piping length correct?
(Ex. Maximum piping length : 100m)

Is the diameter selected separation kit correct?
Doesn't gas leak?
Have the vaccuum process done enough time?
Is the refrigerant flow correct?

1

2

Is the additional refrigerant charge amount correct?

Are the power supply cables connected?

Is the spec. for the power supply cable correct?

Is the length of the transmission line under the limit?
Is the spec. for the transmission cable correct?
(non-polar 2-core, 0.75-1.25mm )

(Note the charge amount to control box cover)

(Power supply for the indoor unit and outdoor unit is separated.)

Is the transmission cable connected to all units?

2

Is the remote controller cable connected to units?
Is not the power supply cable connected to transmission and remote controller terminal?

Are the addresses set? (Ex. Refrigerant circuit address, indoor unit address, remote controller address, etc.)

3

4

5

6

7

8

9

Is the diameter of the selected pipe correct?

10

12

13

14

15

1. TEST RUN

16

17

Have the all settings done on the PCB?

18

Is the ball valve opened?

19

Is the pipe heat-insulated which have the enough thickness?

20

Is the drain water-flow correct?

21

Is the power supplied to crank case heater for more than 12 hours before the start of test run at outdoor
temperature of 20 or below?

22

1 50Hz 220 - 240V

1-1 CHECK ITEMS BEFORE TEST RUN

01-01

7 8

19

21

22

7 20

Is the RB unit cable connected?

11

RB unit

RB unit

11

11

1-2 CHECK ITEM DURING TEST RUN

During the test run operation, check the following items.

When the power supply turn on,check the following items.
Outdoor unit : LED 1 lights continuously.
if LED flushing, it means error occurs ,check the eroor and solve the problem.
Indoor unit : LED RED (operation lamp) & GREEN (timer lamp) lights flush alternately.(Auto restart setting:Invalidity)

RC : Timer display indicates
When errors occur, don't advance towards the following step before a complete settlement of all these errors.

Start the Indoor unit test run from remote controller one by one (Refer to 1-3-2)
Check the following item.
Indoor unit
LED (red&green) light flush at the same time slowly.
Louver operates to open.
Fan rotates
Air flow comes
(Drain pump opration)
RC signal receive
Outdoor unit
Coresponds from indoor unit signal
Compressor start to operates
Fan rotates
Measure the following item.
Indoor unit
Air intake temp.
Air flow temp.
Outdoor unit
Outdoor temp.
Discharge pipe temp.
Suction pipe temp.
High pressure
Low pressure
Contlnue the operation about 10 minutes.
When there is no ploblem, check the next indoor unit.
After every indoor unit is check by test run, please do test run using all of the indoor units and check them.

1

2

3
4

01-02

Outdoor

unit

3 4W 50Hz 380 - 415V

1 50Hz
220 - 240V

Transmission line

Indoor

unit

Central

remote controller

Wired

remote controller

1 50Hz 220 - 240V

RB unit

RB unit

All LEDs go off.(Auto restart setting : Validity)

1-3 TEST RUN METHOD

Supply power to the crankcase heater for 12 hours prior to the start of operation if the outdoor temperature is lower
than 20 . The following is the procedure for the test run operation.

By setting DIP SW1-1 and SW1-2 on control PC board of outdoor unit, cooling test run or heating test run for all the indoor units
in the same refrigerant system can be performed.

1-3-1 TEST RUN FROM OUTDOOR PC BOARD

OFF [OFF,ON] or [ON,OFF]

SW1-2

Operation Mode

Select position of [SW1-2, SW1-1]

ON

ON

OFF

SW1-1

OFF

ON

ON

OFF

Normal Operation

Normal Operation

Heating Test Run

Cooling Test Run

[OFF,OFF]

[OFF,ON] or [ON,OFF]

[ON,ON]

[OFF,OFF]

[ON,OFF]

[OFF,OFF]

[OFF,ON]

01-03

1) Standard wired remote controller
Stop the indoor and outdoor units. Push the FAN CONTROL button and
MASTER CONTROL button simultaneously for more than three seconds.
The air conditioner will start to conduct a test run and TEST will display on
the remote controller display.
However, the SET TEMP./DAY setting button does not have function,
but all other buttons, displays, and protection functions will operate.

1-3-2 TEST RUN FROM REMOTE CONTROLLER

To stop test run, push the START/STOP button of the standard wired remote
controller.
For the operation method, refer to the operating manual and perform operation
check.
Check that there are no abnormal sounds or vibration sounds during test run
operation.

2) Standard wireless remote controller

Press the test button of UTB - SA or short two pieces of metallic bodies
in the test run frame of UTB - VA, while the air conditioner is running.

To stop test run operation, push START/STOP button of the wireless
remote controller.

When the air conditioner is being test run, the OPERATION
and TIMER lamps of indoor unit flash slowly at the same time.

START/STOP button

TEST RUN button

A B C D

TEST

RUN

UTB - SA

UTB - VA

*

*

*

*

SET

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

OP

SET

D

ZONE

ENERG

COOL

CLOCK

C

NON STOP

TEST

COOL

CLOCK

C

NON STOP

TEST

UTB - LA

UTB - LB

3) Simple remote controller
Stop the indoor and outdoor units. Push the remote controller

SET

button and

button

simultaneously for more than three seconds. The air conditioner will start to conduct a test
run and will display

on the temperature display.

display.
However the

setting button does not have function but all other buttons,
displays and protection functions will operate.
To stop test running press the button of the simple remote controller.
For the operation method refer to the operating manual and perform operation check.
Check that there are no abnormal sounds or vibration sounds during test run operation.

4) Central remote controller

CHECK

ACL

MASTER

ENERGY ANTI

FAN

TIMER

SET

TIMER

DELETE

TIMER

DAY

CLOCK
ADJUST

DAY OFF

TEMP.

MEMORY
OPERATION

MEMORY

TEST

SET

CENTRAL

DELETE

BACK

GROUP

ZONE

ON OFF

TIME

CONTROL

CONTROL

FILTER
RESET

CONTROL

FREEZE

COPY

TIMER
MODE

SAVE

SETTING SETTING

Remote control group operation settings are performed in the control mode. The following procedure for the setting is the same
for any of the control modes: Individual mode / Group control mode / All control grop.

Push to select control mode from among Individual control mode / Group
control mode / All control.

When Group control mode is selected use to select the desired group number,
then go to (3).

SET

60 minutes' test run starts.

To stop the test run, do the same procedure as those for stop a normal operatin.

It is possible to change the settings for the operation mode (heating / cooling) and fan setting.

Once the signal has been transmitted, the segment and LED
will go out. The indoor unit will start test run operation.

SET

If the test run is stopped midway, do the operation shown in (3) above and press ,

ON OFF

will come on, then do the operation shown in (4). Test run will stop.

When Individual control mode is selected, use and to select the desir­ed central control number, then go to (3).

When All control mode is selected, go directly to (3).

Press TEST and will light up. The operation setting is applied to the selected
units.

Press to send the signal and test run setting is sent to the indoor unit.

will flash as the signal is being transmitted.

(1)

(2)

(3)(4)

(1)

(2)

(3)

(4)

(5)

SELECT

NOTE :

01-04

1) When the test run signal is transmitted from standard wired, wireless remote controller, simple remote controller
and central remote controller.
(1) The test runn operation starts and the electric expansion valve is controlled to a maximum flow, regardless of
the temperature condition.

(2) De-frosting and frost prevention operation has priority over item(1).
(3) After 60 minutes passes, the test run stops. However, the operation continues in same operating mode.

2) When the test run signal is transmitted from the outdoor unit.
(1) Whether state of the indoor unit operates or stops, All units in the same refrigerant system will start to conduct a
test run in accordance with the operation

mode set by DIP SW 1-1 and SW 1-2 of outdoor unit ( see 1 - 3 - 1 ).

(2) Test running initialization is shown below.

Fan speed Hi Hi

Room Temperature Indication 18 30

Vertical Air Direction Panel

Horizontal Air Direction Panel

Swing

Operating Mode Cooling Heating

OFF OFF

1-4 TEST RUN CONTROL

Position

1

Position

4

Position

3

Position

3

Please refer to '4-4 LOUVER CONTROL' in this manual and find the definition
for air direction panel position.

01-05

2 . FUNCTION OF PRINTED CIRCUIT
BOARD

TM

R407C

2-1 PCB LAYOUTS

2-1-1 INDOOR UNIT CONTROL CIRCUIT BOARD

2. FUNCTION OF PRINTED CIRCUIT BOARD

02-01

Indoor unit

SW 1

SW 2

DIP SW

SW 3

SW 4

Room temp correct coefficient of heating 1

Room temp correct coefficient of heating 2

Room temp correct coefficient of cooling

Forbidden(Indoor unit fan speed switch 1)
Forbidden(Indoor unit fan speed switch 2)

Forbidden(Indoor unit fan speed switch 3)

Extermal input select edge / pulse

Forbidden(Indoor unit model code)

1
2
3
4

1
2
3
4

1
2
3
4
1
2
3
4

Filter check validity / invalidity

Forbidden(Indoor unit model code)

Forbidden(Indoor unit model code)

Forbidden(Indoor unit model code)

SW 6
SW 7
SW 8
SW 9
SW 10

Indoor unit address switch

Forbidden

Rotary SW

Forbidden

Forbidden

Forbidden

Auto restart validity / invalidity

Refrigeration circuit address 1
Refrigeration circuit address 2

Remote controller address

Indoor unit control circuit board

SWITCH POSITION

Wireless remote controller custom code switch 1

1

2
3

4

Wireless remote controller custom code switch 2

Frost prevention temperature shift switch

Draft prevention setting switch

SW 5

CN27

CN18

CN19 CN20 CN21

CN22 CN23

CN24

CN25

CN26

CN11

CN12

CN13

CN14

CN1

CN2

CN4

CN5

CN10

CN6

CN3

CN17

CN16

CN15

SW1

SW2

SW3 SW4

SW5

SW7

SW9

SW6

SW8

SW10

CN201

CN101

CN23

CN1

CN9

CN16

CN7

CN4

CN13

CN11

CN6

CN5

CN19

CN12

CN8

CN22

CN24

CN21

CN20

CN17

CN18

CN14

CN3

CN25

CN15

CN26

SW1

SW2

SW3

SW4

SW5

SW7

SW9

SW6

SW8

SW10

For AB / AU / AR types indoor unit

For AS / AW types indoor unit

CN101 and CN201 exist
in the PCB of power supply.

SWITCH POSITION

Compact wall mounted type indoor unit control circuit board

CN7

CN4

CN101

CN6

CN9

CN1

CN108

CN12

CN2

CN107

CN8

CN10

CN3

CN11

SW4

W101

SW5

SW1 SW2

SW3

JM1

JM2

CN104

CN105

CN102

CN103

CN106

W102

W103

W104

Controller PCB

Power supply PCB

2-1-2 INDOOR UNIT CONTROL CIRCUIT BOARD
(COMPACT WALL MOUNTED TYPE)

Indoor unit

SW 1

SW 2

DIP SW

SW 3

SW 4

Forbidden(Indoor unit fan speed switch 1)

Forbidden(Indoor unit fan speed switch 2)

Forbidden(Indoor unit model code)

1
2

3

4

1

2

3

4

1

2

3

4

Forbidden(Indoor unit model code)

Wireless remote controller custom code

Indoor unit address switch

Forbidden

Rotary SW

Forbidden

Auto restart validity / invalidity

Refrigerant circuit address switch

Refrigerant circuit address switch

SW 5

Indoor unit address switch

Refrigerant circuit address switch

Indoor unit address switch

Refrigerant circuit address switch

JM 1
JM 2

Jumper

wire

Wireless remote controller custom code

02-02

2-1-3 OUTDOOR UNIT CONTROL CIRCUIT BOARD

02-03

SW9 SW8

SW6SW7 SW5 SW4SW3 SW2 SW1

CN27 CN34

CN33

CN45

CN24

CN25

CN26

CN4

CN3

CN28

CN44

CN22

CN2

CN35

CN29

CN30

CN31

CN1

CN42

CN48

CN20

CN19

CN18 CN14

CN13 CN11 CN9 CN7

CN12 CN10 CN8

CN6

CN5

CN51

LED1
LED2
LED3

LED4

LED5
LED6

Outdoor unit

SW 1

SW 2

SW 3

SW 4

SW 5

SW 6

SW 7

1
2
3
4

1
2
3
4

1
2
3
4

1
2
3
4

1
2
3
4

1
2
3
4

1
2
3
4

Forced oil recovery operation
Forbidden

Silent operation mode
Snow falling protection fan mode

EEV initialization

System type switch 1
System type switch 2
Forbidden

SW 8
SW 9

Base heater validity / invalidity

Forbidden
Forbidden

Forbidden
Defrost temperature setting SW1
Defrost temperature setting SW2
Forbidden
Forbidden

Forbidden
Forbidden

Forbidden
Forbidden
Forbidden
Forbidden
Forbidden

DIP SW

ROTARY SW

Test run(Heating)

Test run(Cooling)

Pump down operation
Forced defrost operation

Refrigerant circuit address switch 1
Refrigerant circuit address switch 2

Forbidden

1

2

3

4

5

6

1

2

3

4

5

6

DIP SW1

DIP SW2

O

N

O

N

Wired & Simple remote controller

SW 1

SW 2

DIP SW

Remote controller switch 1(Terminator)

Indoor unit connection (One / multiple)

Forbidden

Remote controller switch 2(Master / Slave)

Forbidden

Back ground light validity / invalidity

Maintenance switch

Forbidden

Battery backup switch

1
2

3
4

5
6

1
2

3
4

5
6

Forbidden

Cooling / Heat pump

Auto change over validity / invalidity

2-1-4 WIRED REMOTE CONTROLLER,SIMPLE REMOTE CONTROLLER
CIRCUIT BOARD

*

Simple remote
controller only

*

Wired remote
controller only

Wired remote controller

Simple remote controller

DIP SW1 DIP SW2

02-04

DIP SW3

DIP SW2

SWITCH 42

Central remote controller

SW 2

SW 3

1
2

3
4

5
6

7
8

1
2

3
4

Filter sign indication ON / OFF
C / F switch
RC operation prohibit function validity/invalidity

Forbidden
Forbidden

SRAM battery ON / OFF
Forbidden
Forbidden

Forbidden

Forbidden

Initial setting

External input validity / invalidity
External input select edge / pulse

SW 42

DIP-SW

o

o

2-1-5 CENTRAL REMOTE CONTROLLER CIRCUIT BOARD

02-05

2-1-6 NETWORK CONVERTORS' CIRCUIT BOARD

02-06

Network Convertor (UTR-YSSA)

SW 103

DIP SW

SW 107

SW 109

Forbidden

Wired remote controller validity / invalidity
External input validity / invalidity

External input select edge / pulse

Auto changeover validity / invalidity

1
2
3
4

1
2

5
6
7
8
1
2
1
2

Auto restart validity / invalidity

Refrigerant circuit address 1

SWITCH POSITION

(1) NETWORK CONVERTOR (UTR-YSSA)

Remote controller type

Number of connected indoor units

SW 108

* Set to OFF for duct type indoor unit

SW 110
SW 111

ROTARY
SW

Refrigerant circuit address 2

SW111

SW109

SW103

SW107

SW110

SW108

D129

02-07

(Switch)

SWITCH AND LED POSITION

(2) NETWORK CONVERTOR (UTR-YLLA)

Switch No.

SW1
SW2
SW3
SW4
SW5
SW6
SW7

Push switch

Push switch
Push switch
Push switch
Rotaly switch (0-15)
Rotaly switch (0-15)

Push switch

CPU Reset

Selection of setting mode

Contents

(LED)

LED No.

D9
D14
D25-D18
D29-D26

Contents

Type

Service Pin SW (VRF side)

Service Pin SW (Lon works side)

Confirmation of setting
Setting up the value at the each setting mode (D25-D22)

Setting up the value at the each setting mode (D21-D18)

Light up when SW1 is pressed (Neuron ID Transmission)
Light up when SW2 is pressed (Neuron ID Transmission)

Indicates the setting mode selected with SW3

Indicates the setting value specified with SW5 and SW6

SW3

SW4

SW5

SW6

SW7

SW1

SW2

D9

D14

D29,28,27,26(From left)

D25,24,23,22,21,20,19,18(From left)

2-2 MICROPROCESSOR FUNCTION LIST

2-2-1 INDOOR UNIT

02-08

Large

Ceiling

Universal

Compact
Cassette

Thin

Cassette

Large

Cassette

Compact

Duct

Low

Static

Pressure

Duct

High

Static

Pressure

Duct

60,000
54,000
45,000
36,000
30,000
24,000 (25,000)

24 25 25
20,000
18,000
14,000
12,000
9,000
7,000

CN1 AC IN
CN2 TH. FUSE
CN3 FAN CAPA
CN4 FAN MOTOR
CN5 D. PUMP
CN6 S. VALVE
CN10 SP-M (U,D)
CN11 SP-M (R,L)
CN12 HEATER
CN13 DISPLAY
CN14 E.E.VALVE
CN15 FLOAT SW
CN16 MOTOR F. BACK
CN17 REMOCON
CN18 TEST
CN19 R. TH
CN20 P. TH
CN21 S. TH
CN22 EX. OUT1
CN23 EX. OUT2
CN24 EX. OUT3
CN25 FLASH
CN26 COMMUNICATION-PWB
CN27 EX. IN
CN101 NETWORK
CN201 COMMUNICATION
SW1 FUNCTION 1
SW2 FUNCTION 2
SW3 FUNCTION 3
SW4 FUNCTION 4
SW5 FUNCTION 5
SW6

INDOOR UNIT ADDRESS 1

SW7 FORBIDDEN
SW8

REFRIGERANT ADDRESS 1

SW9

REFRIGERANT ADDRESS 2

SW10

REMOTE CONTROLLER ADDRESS

INDOOR UNIT TYPE

CAPACITY

(BTU/h)

02-09

Wall Mounted Ceiling Wall

30,000
24,000
18,000

14,000
CN1 TH. FUSE
CN2 FAN MOTOR
CN3 FAN MOTOR
CN4 D. PUMP
CN5 S. VALVE
CN6 DIFFUSER/SP-M(U,D)
CN7 SP-M(L/R)
CN8 DISPLAY-1
CN9 DISPLAY-2
CN10 F. BACK
CN11 TEST
CN12 E.E.VALVE
CN13 REMOCON
CN14 FLOAT
CN15 NETWORK
CN16 R.-TH
CN17 P-TH
CN18 S-TH
CN19 FLASH
CN20 HEATER
CN21 EX. IN
CN22 EX. OUT1
CN23 EX. OUT2
CN24 EX. OUT3
CN25 COMMUNICATION-PWB
CN26 COMMUNICATION
SW1 FUNCTION 1
SW2 FUNCTION 2
SW3 FUNCTION 3
SW4 FUNCTION 4
SW5 FUNCTION 5
SW6 INDOOR UNIT ADDRESS 1
SW7 FORBIDDEN
SW8 REFRIGERANT ADDRESS 1
SW9 REFRIGERANT ADDRESS 2
SW10 REMOTE CONTROLLER ADDRESS

INDOOR UNIT TYPE

CAPACITY

(BTU/h)

02-10

Compact Wall Mounted

14,000 ○
CAPACITY 12,000 ○
（BTU/h） 9,000 ○

7,000 ○

CN1 POWER-PWB ○
CN2 FAN F. BACK ○
CN3 E. E. VALVE ○
CN4 SP MOTOT(U,D) ○
CN5 DISPLAY ○
CN6 ROOM TH. ○
CN7 PIPE TH. ○
CN8 TEST ○
CN9 FLASH ○
CN10 EX. IN ○
CN11 EX. OUT ○
CN12 COMMUNICATION-PWB ○
CN101 MAIN-PWB ○
CN102 FAN MOTOR ○
CN103 TRANS-P ○
CN104 TRANS-S ○
CN105 TH. FUSE ○
CN106 S. VALVE ○
CN107 NETWORK ○
CN108 COMMUNICATION ○
W101-102 POWER SUPPLY ○
W103-104 FAN CAPACITOR ○
SW1 FUNCTION ○
SW2 FUNCTION & INDOOR UNIT ADDRESS ○
SW3 REFRIGERANT CIRCUIT ADDRESS ○
SW4 INDOOR UNIT ADDRESS ○
SW5 REFRIGERANT CIRCUIT ADDRESS ○
JM1

WIRELESS REMOTE CONTROLLER CUSTOM CODE

○

JM2

WIRELESS REMOTE CONTROLLER CUSTOM CODE

○

INDOOR UNIT TYPE

AO*90MPCMFOUTDOOR UNIT TYPE

CN1

AC IN

CN2

NET

CN3

FAN.1

CN4

FAN.2

CN5

BASE HEATER

CN6

CRANK CASE HEATER
CN7
CN8

S.V.1

CN9

S.V.2

CN10

S.V.3

CN11

S.V.4

CN12

S.V.5

S.V.8

S.V.6

S.V.7

CN13
CN14

CN19
CN20

TERMINATOR

CN22

COMP.1

CN24

COMP.2

CN25

COMP.3

CN26

TH.1

CN27

FLASH W/R M

FLASH W/R S

CN28
CN29

E.E.V.3

E.E.V.1

E.E.V.2

CN30

P.SEN-H

P.SEN-M

CN31

P.SW-H

CN33

TEST

CN34

TH.2

CN35
CN42
CN44

EXT.OUTPUT

CN45
CN48

COMMUNICATION PWB

CN51
SW 1

FUNCTION 1
SW 2

FUNCTION 2
SW 3 FUNCTION 3
SW 4 FUNCTION 4
SW 5 FUNCTION 5
SW 6 FUNCTION 6
SW 7

2-2-2 OUTDOOR UNIT

SW 8

SW 9

REFRIGERANT
ADDRESS 2

REFRIGERANT
ADDRESS 1

CN18

4WV.2

4WV.3

4WV.4

FUNCTION 7

02-09

2-3 FUNCTION AND SETTING OF EACH SWITCH

2-3-1 INDOOR UNIT

02-12

1-2 Room temperature correct coefficient of heating.

Decide the heating temperature correct coefficient value of heating.

2-1 Room temperature correct coefficient of cooling.

Decide the cooling temperature correct coefficient value of cooling.

HEATING TEMPERATURE CORRECTION

Coefficient value

OFF

ON

+ 4 deg

SW1-3

SW1-4

+ 8 deg

OFF

ON OFF

0 deg

OFF

+ 12 degON ON

COOLING TEMPERATURE CORRECTION

Coefficient value

0 deg

SW2-1

ON + 2 deg

OFF

2-2 Dip SW 2-2 setting forbidden

OFF

SW2-2

2-3 Filter check validity / invalidity.

Filter check is set with Dip SW 2-3

FILTER CLEANING FUNCTION

Filter check

Invalidity

SW2-3

ON Validity

OFF

DIP SWITCH SETTING

1. SW1 setting

2. SW2 setting

( Factory setting)

( Factory setting)

( Factory setting)

( Factory setting)

2-4 Auto restart validity / invalidity.

Control the auto restart function by turning this switch ON/OFF.

AUTO RESTART SETTING

Auto restart

Validity

SW2-4

ON

Invalidity

OFF

( Factory setting)

1-1 DIP SW 1-1 and SW 1-2 setting forbidden

OFF

SW1-1

( Factory setting)

OFF

SW1-2

02-13

3-1 Indoor unit fan speed switch

This switch can select fan speed corresponding to each model.

Large ceiling type

OFF

OFF

OFFSW3-1

SW3-2

OFF ON

OFF ON

OFF

OFF ON

OFF

SW3-3

ON

Cassette type

OFF

AB30

AB36 AB45

AB54

SW3-1

SW3-2

SW3-3

AU54

AU45

AU36 AU30

AU25

OFF

OFF

ON

OFF

OFF

OFF

ON

OFF

OFF

OFF

ON

OFF

ON

ON

AU20

ON

ON

ON

3. SW3 setting (Never change at the site)

Wall mounted type

OFF OFFSW3-1

SW3-2

ON

OFF ON

SW3-3

AS18

AS24 AS30

Ceiling wall type

OFF

OFFSW3-1

SW3-2

ON

OFF ONON

OFF

SW3-3

ON

AW14

AW18 AW24

AW30

ON

ON

ONON

ONON

ON

ON

SW3-1

SW3-2

SW3-3

OFF

OFF

OFF

Other model (Default)

3-2 DIP SW 3-4 setting

SW3-4

External input select

OFF

ON

Edge

Pulse

( Factory setting)

This switch is used to select the format of external input command as shown in
the table below.

OFF

OFF

OFF ON

OFF

AW7

AW9 AW12

ON

OFF

OFF

OFF

02-14

Indoor unit model code.
This switch for changing the model code information of indoor unit PCB.

INDOOR UNIT MODEL CODE

SW4-1

SW4-2

Type

SW4-3

60

ON

OFF

ON

ON

54

OFF

OFF

ON

ON

45

ON

OFF

OFF

ON

36

OFF

OFF

OFF

ON

30

ON

ON

ON

OFF

25(24)

OFF

ON

ON

OFF

20

ON

ON

OFF

OFF

18

OFF

ON

OFF

OFF

14

ON

OFF

ON

OFF

12

OFF

OFF

ON

OFF

9

ON

OFF

OFF

OFF

7

OFF

OFF

OFF

OFF

SW4-4

Capacity

5-2 Frost prevention temperature shift switch

4. SW4 setting (Never change at the site)

5. SW5 setting

5-1 Wireless remote controller custom code switch

Decid the custom code and restrict the type of infrared control signal, in order to prevent
mixing of multiple indoor unit signals.

Remote controller custom code switch

OFFOFF

SW5-1

OFFON

Type A

Custom code

ON

ON

ON

SW5-2

Type B

Type C

Type D

( Factory setting)

5-3 Draft prevention setting switch (only for cassette type)

Set the frost prevention temperature for indoor
unit.

Frost prevention temperature shift switch

NormalOFF

SW5-3

HighON

Frost prevention temperature

( Factory setting)

OFF

C

O

O

L

FA

N

H

E

A

T

A

U

T

O

A

U

T

O

H

I

G

H

M

E

D

LO

W

T

I

M

E

R

T

I

M

E

R

R

E

S

E

T

C

L

O

C

K

S

L

E

E

P

E

N

E

R

G

Y

S

A

V

E

C

A

M

P

M

O

N

O

F

F

O

F

F

O

N

H

M

A B C D

A B C D

D

R

Y

ABCD

Remote controller

Remote controller
signal selector
switch

Set the flap angle of cassette type unit.

Draft prevention switch

Normal positionOFF

SW5-4

Draft prevention positionON

flap angle

( Factory setting)

Normal position Draft prevention position

35 - 65

25 - 65

Flap angle Flap angle

*If air conditioning cooling operation is performed in
long time and a humid place, there is a possibility
that waterdrop may hang down from a blow-off mouth.

An air flow direction, by moving the flap angle horizontally,
It can prevent that a cold wind directly hits.

1. Press the MASTER CONTROL button for
more than five seconds to start the code
change.

2. Press the (+) or (-) button to select the
desired code.

3. Press the MASTER CONTROL button again
to end the code change.

A B C D

02-15

ROTARY SWITCH SETTING

EXTERNAL INPUT AND OUTPUT

Indoor unit address switch

Sets the indoor unit addresses.

INDOOR UNIT ADDRESS SWITCH

Refrigerant circuit address switch

Sets the refrigerant circuit.

REFRIGERANT CIRCUIT ADDRESS SWITCH (Factory setting SW 8: 0 SW 9: 0)

Remote controller address switch

REMOTE CONTROLLER ADDRESS SWITCH (Factory setting : 0)

When the indoor unit is wired by remote controller group, to identity the indoor unit in the remote
controller group, the number (remote controller address) in the remote controller group is set.
Set the remote controller address in the 0.1.2,~,15 order (Blank is not allowed)

1.SW6 setting

2.SW7 setting forbidden

Rotary SW7 0

Rotary SW

6

Description Remarks

Indoor unit

address SW

Indoor unit address

( 0~15 )

Rotary SW

8

9

Description Remarks

Refrigerant circuit
address 1
Refrigerant circuit
address 2

Refrigerant circuit

address (the first digit)
Refrigerant circuit
address (the second digit)

Rotary SW

10

Description Remarks

Remote controller
address SW

Remote controller
address

3.SW8,9 setting

4.SW10 setting

(Factory setting : 0)

Connector

CN21

CN27

Input

Output

OPERATION DISPLAY
(DC12V)

Remarks

Indoor unit type

Wall mounted /
Ceiling wall types

CN22

CN23

CN24

Other types

All types

CONTROL INPUT

(OPERATION / STOP)

ERROR DISPLAY
(DC12V)

INDOOR UNIT FAN
STATUS DISPLY(DC12V)

See 2-4-1
for details

1-2 Model code setting switch

The model code infomation corresponding to each model is provided with the switch.

2-1 Dip SW 2-1,2-2 setting forbidden

OFF

SW2-1

2-3 DIP SW 2-4 setting forbidden.

DIP SWITCH SETTING

1. SW1 setting (Never change at the site)

2. SW2 setting

1-1 Fan speed setting switch

( Factory setting)

( Factory setting)

The fan speed corresponding to each model is set with the switch.

OFFSW1-1

SW1-2

OFF

ON ONOFF

ON

OFF ON

AS7

AS9 AS12

AS14

OFFSW1-3

SW1-4

OFF

ON ONOFF

ON

OFF ON

AS7

AS9 AS12

AS14

OFF

SW2-2

2-2 Auto restart validity / invalidity.

The auto restart function be comes validity by changing the switch position from OFF to ON.

AUTO RESTART SETTING

Auto restart

Validity

SW2-3

ON

Invalidity

OFF

( Factory setting)

OFF

SW2-4

2-3-2 INDOOR UNIT ( COMPACT WALL MOUNTED TYPE )

02-16

3-1 Refrigrant circuit address switch

By combined with Rotary SW5 , the refrigerant circuit address (0-99) can be set.
Please see "6-2 ADDRESS SETTING" for refrigerant address conversion table.

OFF

OFF

16 - 31

32 - 47

ON

OFF

OFF

ON

OFF

48 - 63

Remarks

3. SW3 setting

( Factory setting)

SW3-1 SW3-2 SW3-3

Refrigerant

circuit address

0 - 15

64 - 79

80 - 95

96 - 99

ON

ON

OFF

ON

ON

ON

OFF

OFF

OFF

OFF

OFF

OFF

ON

ON

About Rotary

SW5,

see next page

3-2 DIP SW 3-4 setting forbidden.

( Factory setting)

OFF

SW3-4

02-17

ROTARY SWITCH SETTING

JUMPER WIRE

Indoor unit address switch

Set the indoor unit addresses.

INDOOR UNIT ADDRESS SWITCH

Refrigerant circuit address switch

By combined with DIP switch 3-1,3-2 and 3-3,the refrigerant circuit address(0 - 99)can be set.
Please see "5-3-3 ADDRESS SETTING" for the refrigerant address conversion table.

REFRIGERANT CIRCUIT ADDRESS SWITCH (Factory setting SW 5: 0)

1.SW4 setting

Rotary SW

4

Description Remarks

Indoor unit

address SW

Indoor unit address

( 0~15 )

Rotary SW

5

Description Remarks

Refrigerant circuit
address SW

About DIP switch 3-1,3-2
and 3-3 see previous page

2.SW5 setting

(Factory setting : 0)

Wireless remote controller custom code switch

Limit the type of infrared control signal which the indoor unit is controlled,in order to prevent
misoperation of the unit due to the signal from other wirless remote controller.

Remote controller custom code switch

ConnectConnect

JM 1

ConnectDisconnect

Type A

Custom code

Disconnect

Disconnect

Disconnect

JM 2

Type B

Type C

Type D

( Factory setting)

Connect

C

O

O

L

FA

N

H

E

A

T

A

U

T

O

A

U

T

O

H

I

G

H

M

E

D

L

O

W

T

I

M

E

R

T

I

M

E

R

R

E

S

E

T

C

L

O

C

K

S

L

E

E

P

E

N

E

R

G

Y

S

A

V

E

C

A

M

P

M

O

N

O

F

F

O

F

F

O

N

H

M

A B C D

A B C D

D

R

Y

ABCD

Remote controller

Remote controller
signal selector
switch

1. Press the MASTER CONTROL button for
more than five seconds to start the code
change.

2. Press the (+) or (-) button to select the
desired code.

3. Press the MASTER CONTROL button again
to end the code change.

A B C D

02-18

EXTERNAL INPUT AND OUTPUT

Control Input

CN10

Connector

CN11

See 2-4-2
for details.

Remarks

Operation Display

Input or Output

(Operation / Stop)

(DC12V)

2-3-3 OUTDOOR UNIT

02-19

1. SW1 setting

1-1 Test run

By setting DIP SW1-1 and SW1-2 on control PC board of outdoor unit, cooling test run or heating test run for all the indoor
units in the same refrigerant system can be performed.

SELECTOR SWITCH FOR TEST RUN AND NORMAL OPERATION

1-2 Pump down operation

Pump down operation is set with SW1-3

1-3 Forced defrost operation

PUMP DOWN OPERATION

FORCED DEFROST OPERATION

2-1 Silent operation mode (cooling mode only)

Noise level can be reduced using silent operation mode when the outdoor temperature decreases
decreases below 30 C.

2. SW2 setting

SILENT OPERATION MODE

Silent operation mode

Release

SW 2-1

ON Oparate

OFF

2-2 Snow falling protection fan mode

When snowing , to prevent the unit from being covered with snow , the outdoor fan is periodically
operated by this switch even when the compressor is stopped.

SNOW FALLING PROTECTION SW

Snow falling protection fan mode

Release

SW2-2

ON

Operate

OFF

SW1-2 SW1-1 Test Run Remarks

OFF OFF Normal operation

OFF ON Cooling test run

ON OFF Heating test run

ON ON Normal operation

SW1-3 Pump down operation Remarks

OFF Release

ON Operate

OFF ON and be kept at ON position
for more than 30 sec.

SW1-4 Forced defrost Remarks

OFF Release

ON Operate

DIP SWITCH SETTING

( Factory setting)

( Factory setting)

( Factory setting)

( Factory setting)

( Factory setting)

[OFF,OFF] [OFF,ON] and be kept at
[OFF,ON] position for more than 1 min.
[OFF,OFF] [ON,OFF] and be kept at
[OFF,ON] position for more than 1 min.

OFF ON and be kept at ON position
for more than 10 sec.

02-20

2-3 Expansion valve initialization

This switch initializes the number of pulses of the expansion valve when the outdoor unit is stopped.

3. SW3 setting

ELECTRONIC EXPANSION VALVE INITIALIZATION

Initialization

Release

SW2-3

ON Operate

OFF

2-4 Forced oil recoverry operation.

Oil recovery is started manually by DIP SW 2-4 on the PCB.

FORCED OIL RECOVERY

Forced oil recovery

Release

SW2-4

ON Operate

OFF

( Factory setting)

( Factory setting)

Dip SW3-1,3-2,3-3 and SW3-4 setting forbidden

4.SW4 setting

4-1 Defrost temperature setting SW

OFF

SW3-1

SW3-4

SW3-2

OFF

OFF

SW3-3 OFF

The thershold temperature for starting a defrosting operation can be selected by setting up the switches.

SW4-1

SW4-2

ON

OFF

OFF

ON

OFF ON

ON OFF

Temperature

Standard

Low

High

Lower

DEFROST TEMPERATURE

( Factory setting)

4-2 Dip SW4-3 and SW4-4 setting forbidden.

OFF

OFF

SW4-3

SW4-4

5. SW5 setting

5-1 Dip SW 5-1,SW5-2 and SW5-4 setting forbidden

5-2 Base heater validity/invalidity

This switch sets the output of the base heater (CN5) on the PCB.

Base heater

Invalidity

SW5-3

ON validity

OFF

BASE HEATER SWITCH

The base heater output turns ON at an outside temperature of 2 C or less
during heating operation.
Base heater : 220-240V AC , 35W , field supplied.

( Factory setting)

Remarks

OFF ON and be kept at ON position
for more than 10 seconds

02-21

DIP SW 6-1,SW6-2,SW6-3 and SW6-4 setting forbidden

6. SW6 setting

7. SW7 setting

7-1 System type switches

ON

ON

OFF

OFF

SW7-1 System type SW7-2

ON

OFF

OFF

ON

Forbidden

Heat recovery

Forbidden

SYSTEM TYPE SWITCHES

7-2 Dip SW 7-3 and SW 7-4 setting forbidden

( Factory setting)

Forbidden

OFF

OFF

SW7-3

SW7-4

SW8,9 setting

Rotary SW

8

9

Description Remarks

Refrigerant circuit
address 1
Refrigerant circuit
address 2

Refrigerant circuit

address (the first digit)
Refrigerant circuit
address (the second digit)

ROTARY SWITCH SETTING

CN48

OutputConnector

Error Display

(DC12V)

EXTERNAL OUTPUT

OFF

OFF

SW6-1

SW6-2

OFF

OFF

SW6-3

SW6-4

2-3-4 WIRED , SIMPLE REMOTE CONTROLLER

1. SW1 setting

1-1 Remote controller switch 1

1-4 Remote controller switch 2

1-3 DIP SW1-3 setting forbidden

REMOTE CONTROLLER SWITCH 2

Setting for Master/Slave

OFF Master

SW1-4

ON Slave

REMOTE CONTROLLER SWITCH 1

Terminator setting

Not terminated

SW1-1

ON

Terminated

OFF

1-2 Number of indoor unit connection (One/Multiple)

This is switched according to the number of connected indoor units.

NUMBER OF INDOOR UNIT CONNECTION

Number of indoor unit

One unit connection

SW1-2

ON Multiple unit connection

OFF

DIP SWITCH SETTING

SW 1-5 OFF

SW 1-6 OFF

SW 1-3 OFF

This is used to set up the terminated resistance of the wired remote controller.
When 1 remote controller is connected to remote controller group, set this ON all the time.

When 2 remote controllers are connected to remote controller group, set the Master one OFF, and set the Slave one ON.

If it is used to set up Master/Slave setting of wired remote control.
When 1 remote control is connected to 1 remote control group, always set the Master OFF.

When 2 remote controls are connected to remote control group, set one side to Master, and the other side to Slave.

1-5 DIP SW 1-5 and SW 1-6 setting forbidden.

( Factory setting)

( Factory setting)

( Factory setting)

02-22

02-23

2-1 Cooling only / heat pump

Switching cooling only / heat pump.

COOLING ONLY / HEAT PUMP SWITCH

Operation system

Heat pump/Heat recovery

SW2-1

ON Cooling only

OFF

2-2 Auto change over validity/invalidity

Selecting auto change over validity/invalidity.

Never turn it on in the case of Heat pump type.

2. SW2 setting

AUTO CHANGE OVER

Auto change over

Invalidity

SW2-2

ON Validity

Invalidity

Validity

OFF

2-4 Maintenance switch

Used to indicate of the refrigerant system, indoor unit address.

MAINTENANCE SWITCH

Mode

Normal mode

SW2-4

ON Maintenance mode

OFF

2-6 Battery backup switch (Wired remote controller only)

When installing, turn the SW2-6 ON.

2-5 DIP SW 2-5 setting forbidden.

SW 2-5 OFF

2-3 Back ground Light validity (simple remote controller only)
Selecting to use internal background light validity/invalidity.
The background light can turn on during indoor unit operation.

BATTERY BACKUP SWITCH

Battery backup

SW2-6

ON

OFF

Never turn it ON in the case of simple remote controller.

SW 2-3

OFF

ON

Background light

Invalidity

Validity

Never turn it ON in the case of wired remote controller.

( Factory setting)

( Factory setting)

( Factory setting)

( Factory setting)

( Factory setting)

02-24

1-1 DIP SW2-1 setting .
For validity / invalidity the external input function.

1-4 DIP SW2-4 setting.

SW2-4

ON

OFF

1-3 DIP SW2-3 setting.

Filter check sign indication

Non-Display

SW2-3

ON Display

OFF

1-5 DIP SW2-5 setting

SW 2-1 External input function

OFF Invalidity

C / F

C

F

RC operation prohibit function

Validity

SW2-5

ON Invalidity

OFF

1. DIP-SW2 SETTING

2-3-5 CENTRAL REMOTE CONTROLLER

Filter check sign indication or not when filter check come from indoor unit.

C / F switch

Temperature display is centigrate( ) / Fahrenheit( )

C

F

For validity / invalidity the wired and wireless remote controller operation prohibit function.

( Factory setting)

( Factory setting)

( Factory setting)

ON

Validity

( Factory setting)

1-2 DIP SW2-2 setting .
Select the external input command function.

SW 2-2 External input select

OFF Edge

ON

Pulse

( Factory setting)

(Refer to 2-4-4 about external input & output)

02-25

1-6 DIP SW2-6 and 2-7 setting forbidden.

1-7 DIP SW2-8 setting.

SRAM Battery

SW2-8

ON

OFF

SW 2-6 OFF

SW 2-7 OFF

SRAM Battery ON / OFF
When installing the control remote controller, this switch must be set to ON.
(factory setting:OFF)

OFF

ON

At the time of shipment,the battery is turned off to avoid electricity consumption.
Be sure to set this switch to ON.

1-8 SW42 Initial setting button

( Factory setting)

This switch is used when initializing the central remote controller.

2-3-6 NETWORK CONVERTOR

02-26

2. DIP- SW103 (5, 6, 7, 8) setting

Number of the connected indoor units

Number of
connected the
Indoor unit

OFF

OFF

OFF OFF

OFF OFF

OFF ON

OFF OFF

ON OFF

1
2
3
4

5

6

OFF

OFF

ON ON

OFF ON

OFF OFF

OFF ON

OFF ON

DIP-SW 103

5

6

7

8

Number of
connected the
Indoor unit

OFF

ON

ON OFF

OFF ON

ON ON

ON OFF

OFF OFF

7
8
9

10

11

12

ON

OFF

OFF ON

ON OFF

ON OFF

ON OFF

ON ON

DIP-SW 103

5

6

7

8

Number of
connected the
Indoor unit

ON

ON

OFF OFF

ON ON

OFF ON

ON ON

ON OFF

13
14
15
16

ON

ON

ON ON

DIP-SW 103

5

6

7

8

3. DIP SW 107 Setting

3-1 DIP SW 107-1 setting forbidden

Select the wired remote controller validity / invalidity

Wired remote controller

SW 107-2

OFF

ON

Wired remote controller

Invalidity

validity

( Factory setting)

( Factory setting)

Set the DIP-SW 103 (5, 6, 7, 8) according to number of the connected indoor units.

3-2 Wired remote controller validity / invalidity

SW 107-1 OFF

( Factory setting)

(1) Network convertor (UTR-YSSA)

1. Dip SW103 ( 1, 2, 3, 4) setting

Indoor unit model type and remote controller type

Indoor unit type

Heat pump of big multi type

Heat pump of single spilt type

Cooling only of single spilt type

Cooling only of big multi type

Cooling only of single spilt type
Wall mounted with wired RC

RC type

With weekly timer

With weekly timer

Without weekly timer

With weekly timer

With weekly timer

Without weekly timer

RC number

EZ-099DHSE-＊,EZ-000DHSE-＊,EZ-0001HSE-＊,

EZ-000GHSE-＊,EZ-00004HSE-＊,

EZ-00005HSE-＊,EZ-0015HSE-＊,EZ-0019HSE-＊

EZ-0994HSE-＊,EZ-000EHSE-＊

EZ-09503HSE-＊,EZ-0950DHSE-＊

EZ-099CWSE-＊,EZ-000AWSE-＊,EZ-0001WSE-＊,

EZ-000FWSE-＊,EZ-0012WSE-＊

EZ-09906WSE-＊,EZ-000FWSE-＊

EZ-095YWSE-＊

EZ-098VWSE-＊

OFF OFF

OFF OFF

Without weekly timer

Heat pump of single spilt type

DIP-SW103

1

2 3

4

OFF OFF

OFF ON

OFF OFF

ON OFF

ON

OFF

OFF OFF

ON OFF

OFF ON

ON OFF

ON OFF

ON ON

OFF OFF

Set Dip SW103 ( 1, 2, 3, 4) according to indoor unit type and remote
controller (packaged together with the unit) type. You can also set
DIP-SW103 (1, 2, 3, 4) using the remote controller number that is
shown on the rear surface of the remote controller.

Rear View

EZ-########-R

RC Number

Instead of using the remote controller that was packaged together
with the unit, a VRF type remote controller must be used to
connected to network.

( Factory setting)

Asterisks (＊) are used in place of variable characters.

02-27

4. DIP SW 108 setting

4-1 External input validity / invalidity

Select the external input function validity / invalidity

SW 108-1

OFF

ON

External input function

Invalidity

validity

4-2 External input command type

Select the external input command type

SW 108-2

OFF

ON

External input command type

Edge

Pulse

( Factory setting)

( Factory setting)

5. DIP SW109 setting
5-1 Auto changeover validity / invalidity

Select auto changeover function validity / invalidity

SW 109-1

OFF

ON

Auto changeover function

Invalidity

validity

5-2 Auto restart validity / invalidity

Select auto restart function validity / invalidity

SW 109-2

OFF

ON

Auto restart function

Invalidity

validity

( Factory setting)

( Factory setting)

2-4 EXTERNAL INPUT & OUTPUT

2-4-1 INDOOR UNIT ( EXCEPT FOR COMPACT WALL MOUNTED TYPE

02-28

(1) Control input (Operation/Stop)

Indoor unit can be operated or stopped by using indoor unit PCB
CN 21 (Wall mounted type / ceiling wall type) or CN27 (other types)

Dip SW3-4 Input select

OFF

ON

Edge

Pulse

1 Input select

2 In the case of "Edge" input

CONNECTOR INPUT SIGNAL COMMAND

Ch1 of

CN21 (RED)

or

CN27 (RED)

OFF ON

ON OFF

Operation

Stop

*1)

*2)

1

2

CN 21(RED) *1)

or

CN 27(RED) *2)

3

Ch 2

Ch 1

*1) For Wall mounted type / Ceiling wall type.
*2) For other types

Ch1 of
CN21 or
CN27

*1)

*2)

3 In the case of "pulse" input

CONNECTOR INPUT SIGNAL COMMAND

OFF ON Operation

Stop

CN21 (RED)

or

CN27 (RED)

*1)

*2)

Ch1

Ch2

OFF ON

On

On

Off

Remote
Controller

Indoor
Unit

NOTE

1. The last command has priority.

2. The indoor units within the same
remote controller group operates
in the same mode.

3.The wire connection shall be
separate from the power cable line.

Operation

Stop

CN21
or
CN27

*1)

*2)

On

Off

Indoor
Unit

Operation

On

Off

Ch1

Ch2

The width of pulse must be longer than 200ms.

Stop

02-29

(2) Output

1 Operation display

CONNECTOR OUT VOLTAGE STATUS

Operation12V

0V

12V Error

Stop

CN22

CN23

CN24

0V

12V

0V

Normal

Fan stop

Fan run

1

2

CN 23

(WHITE)

+

-

Error

Indicator

1

2

CN 24

(WHITE)

+

-

Indoor unit

fan status

Indicator

Operation

Stop

CN 22

CN 23

CN 24

Indoor

unit

Indoor

unit

Indoor

unit

1

2

CN 22

(WHITE)

+

-

Operation

Indicator

12V

0V

Error

Normal

12V

0V

Fan run

Fan stop

12V

0V

(3) Parts

Following cord (service parts) is required. Please use the parts number shown below
to order the cord from your sales representative.

Name and shapes Q'ty Parts No.

1

1

EXTERNAL
INPUT WIRE

EXTERNAL
INPUT WIRE

9368778002

9368779009

2 Error display

3 Inter locking output with indoor unit fan

EX) Used for inter lock energize for exhaust fan.

Usage

For output port

For control
input port

(1) Control input (Operation/Stop)

Indoor unit can be operated or stopped by using the connector CN10(RED) ON indoor unit PCB.

1

CN 10

(RED)

3

Ch 1

Ch1 of
CN10

*1)

On

On

Off

Remote
Controller

Indoor
Unit

NOTE

1. The last command has priority.

2. The wire connection shall be
separate from the power cable line.

Operation

Stop

(2) Output

1 Operation display

CONNECTOR OUT VOLTAGE STATUS

Operation12V

0V Stop

CN11

Operation

Stop

CN 11

Indoor

unit

1

2

CN 11

(WHITE)

+

-

Operation

Indicator

12V

0V

(3) Parts

Following cord (service parts) is required. Please use the parts number shown below
to order the cord from your sales representative.

Name and shapes Q'ty Parts No.

1

1

EXTERNAL
INPUT WIRE

EXTERNAL
INPUT WIRE

9368778002

9368779009

Usage

For output port

For control
input port

2

2-4-2 INDOOR UNIT (COMPACT WALL MOUNTED)

02-30

(WHITE)

INPUT SIGNAL COMMAND

OFF ON

CONNECTOR

CN10
(RED)

ON OFF

Operation

Stop

02-31

2-4-3 OUTDOOR UNIT

(1) Output

This output indicates the outdoor unit and connected indoor
unit's "Normal" or "Error" status.

1
2

CN 48

(BLACK)

+

-

Error

Indicator

1 Error display

P.C.B

CONNECTOR OUTPUT VOLTAGE STATUS

2 Base heater output

Turn ON when the ambient temperature is low in heating mode.(2 C or less)

1
2

CN 5

(GREEN)

Following cord (service parts) is required. Please use the parts number shown below
to order the cord from your sales representative.

Name and shapes Q'ty Parts No.

1 9368776008

(2) Parts

1 9368777005

EXTERNAL
INPUT
WIRE

BASE
HEATER
WIRE

CN48

(BLACK)

Normal

Error

0V

12V

Normal
12V

0V

CN48

Error

3
4

Usage

For base heater

output port

For error display

output port

Base heater
(Field supply)
AC220-240V,35W

02-32

(1) Input

Indoor units which stored into Central R.C. or PC controller can be operated
or stopped by this input.

CN9

Ch1

Indoor

Unit

Control input (All on / All off)

All ON

CN9
(RED)

DipSW2-1

a) Input select

Central remote controller

PC controller

Input select can be set in environmental set up.
(Please refer to PC Controller's setting manual.)

b) In the case of "Edge" input

CONNECTOR INPUT SIGNAL COMMAND

CN9

(RED)

All ON

All OFF

OFF ON

ON OFF

On

Off

CN9

Ch1

Indoor

Unit

All ON

All OFF

c) In the case of "Pulse" input

DipSW2-2 Input select

"Edge"

"Pulse"

ON

ON

CN9

Ch2

1

OFF

ON

Ch1

CONNECTOR INPUT SIGNAL COMMAND

CN9

(RED)

All ON

All OFF

OFF ON

Ch1

Ch2

OFF ON

All ON

On

Off

On

Off

The width of pulse must be longer than 300ms.

Ch1

1

2
3

P.C.B

Ch2

2-4-4 CENTRAL REMOTE CONTROLLER / PC CONTROLLER

02-33

(2) Output

This output indicates the indoor unit's "Operate" or "Stop" status.

Indoor

Unit

ON

OFF

Short

Open

CN1

Ch1

Operation display

Ch1

1

2
3

CN1

(WHITE)

P.C.B

Open

Short

CN1

(WHITE)

All of indoor units "OFF"

At least one more indoor units "ON"

Ch2

CONNECTOR

OUTPUT

SIGNAL

STATUS

Ch1

ON /OFF

Indicator

Error

Indicator

Com

Error display

This output indicates the indoor unit's "Normal" or "Error" status.

CN1

(WHITE)

All of indoor units "Normal"

At least one more indoor units "Error"

CONNECTOR STATUS

Ch2

Indoor

Unit

Error

Normal

CN1

Ch2

1

2

(3) Parts

Following cord (service parts) is required. Please use the parts number shown below
to order the cord from your sales representative.

9368779009

Name and shapes Q'ty Parts No.

1

EXTERNAL
INPUT
WIRE

* 1

* 2

* 1 Always insert a diode on both ends of relay coil.
* 2 Pin 1 - Pin 3 Max 15V
Pin 2 - Pin 3 70mA

OUTPUT

SIGNAL

Open

Short

Short

Open

Usage

For input and
output port

02-34

(1) Control input

(Operation / Stop)

Indoor units that connected to network convertor can be controlled (all operation / all stop
by this input.

CN105

Ch1

Indoor

Unit

All operation

CN105
(RED)

DipSW108-1

a) Input select

b) In the case of "Edge" input

CONNECTOR INPUT SIGNAL COMMAND

CN105

(RED)

All operation

All stop

OFF ON

ON OFF

ON

OFF

CN105

Ch1

Indoor

Unit

All operation

All stop

c) In the case of "Pulse" input

DipSW108-2 Input select

"Edge"

"Pulse"

ON

ON

CN105

Ch2

OFF

ON

Ch1

CONNECTOR INPUT SIGNAL COMMAND

CN105

(RED)

All operation

All stop

OFF ON

Ch1

Ch2

OFF ON

All stop

On

Off

On

Off

The width of pulse must be longer than 200ms.

Ch2

3

2
1

P.C.B

Ch1

2-4-5 NETWORK CONVERTOR

SW111

SW109

SW103

SW107

SW110

SW108

D129

. . .

. . .

. . .

CN105(RED)

CN108(BLK) CN109

EXT IN

EXT OUT1

EXT OUT2

3 2 1

1 2 3

1 2 3

The connector positions and pin number of
network convertor (UTR-YSSA) for external
input and output are shown in the right figure.

02-35

(2) Output

This output indicates the indoor unit's "Operation" or "Stop" status.

Indoor

Unit

Operation

Stop

Short

Open

CN108
(BLK)

Operation display (EXT OUT1)

CN108

(BLK)

P.C.B

Open

Short

CN108

(BLACK)

Indoor units "Stop"

Indoor units "Operation"

CONNECTOR

OUTPUT

SIGNAL

STATUS

ON /OFF

Indicator

Com

Error display (EXT OUT2)

This output indicates the indoor unit's "Normal" or "Error" status.

CN109

(WHITE)

All of the indoor units "Normal"

At least one more indoor units "Error"

CONNECTOR STATUS

Indoor

Unit

Error

Normal

CN109

(WHITE)

1

2

(3) Parts

Following cord (service parts) is required. Please use the parts number shown below
to order the cord from your sales representative.

9368779009

Name and shapes Q'ty Parts No.

1

EXTERNAL
INPUT
WIRE

* 1

* 2

* 1 Always insert a diode on both ends of relay coil.

* 2 Pin 2 - Pin 3 Max 15V, 50mA

OUTPUT

SIGNAL

Open

Short

Short

Open

2

1

3

CN109

(WHITE)

P.C.B

Error

Indicator

Com

* 1

* 2

* 1 Always insert a diode on both ends of relay coil.

* 2 Pin 2 - Pin 3 Max 15V, 50mA

2
1

3

Usage

For control
input and output port

3 . OUTDOOR UNIT OPERATION
CONTROL

TM

R407C

3-1 COMPRESSOR OPERATION CONTROL

3. OUTDOOR UNIT OPERATION CONTROL

3-1-1 OPERATION / STOP CONDITION

Compressor operation condition

When cooling requirement capacity or heating requirement capacity from either of the indoor units in the same
refrigerant system is input, the compressor operates.
But in the following case, the compressor operates in accordance with operation of each mode.

During 3 minute restart prevention operation

During compressor recovery operation
During deicing operation
Failure (except for a part)
Defrosting

Oil recovery

Under expansion valve initialization

At protective operation

Central discharge temperature protection
High pressure protection

Compressor stop condition

When all the indoor units in no "cooling requirement capacity" or "heating requirement capacity ",

all the compressors

are stopped.

But, in the following case, the compressor operates in accordance with operation of each mode.

Defrosting
Oil recovery

3-1-2 COMPRESSOR OUTPUT PATTERN

The output pattern of a compressor is defined as below.

OUTPUT PATTERN

COMPRESSOR 1
(2HP)

COMPRESSOR 2
(4HP)

COMPRESSOR 3
(6HP)

Step 0
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7

OFF
ON
OFF
ON
OFF
ON
OFF
ON

OFF
OFF
ON

ON

OFF
OFF
ON

ON

OFF
OFF
OFF
OFF
ON
ON
ON
ON

Compressor output pattern

3-1-3 3 MINUTES RESTART PREVENTION (3 MIN ST)

When the compressor is stopped, the compressor does not start on any condition for 3 minutes afterwards.

But, this function is excluded when defrosting, oil recovery is performed and the power is turned on.

03-01

If compressor 1, 2, or 3 fails, or if two compressors fail at the same time, the remaining compressor(s)
perform recovery operation to prevent interruption of air conditioning system operation by a failure.

When compressor 1, 2, or 3 is judged to be faulty, the system is operated by switching the compressor output
pattern (compressors 0 to 6) as shown in the following table.

Compressor failure is displayed by LEDs on the PCB of the outdoor unit and by output ERROR to the
communication bus line (standard wired remote controller, central remote controller, PC controller).

(a) When compressor 1 (2 HP) fails (compressor 2 is substituted for compressor 1)

(b) When compressor 2 (4 HP) fails (compressor 3 is substituted for compressor 2)

(c) When compressor 3 (6 HP) fails (compressor 1 and 2 are substituted for compressor 3)

Compressor recovery operation

ORDINARY OPERATION

RECOVERY OPERATION

(a)X-4-6 (b)2-X-6 (c)2-4-X

Step 0
Step 1
Step 2
Step 4
Step 5
Step 6
Step 7

Step 0
Step 2
Step 2
Step 4
Step 6
Step 6
Step 6

Step 0
Step 1
Step 4
Step 4
Step 5
Step 5
Step 5

Step 0
Step 1
Step 2
Step 3
Step 3
Step 3
Step 3

(d)X-X-6

Step 0
Step 4
Step 4
Step 4
Step 4
Step 4
Step 4

(e)X-4-X

Step 0
Step 2
Step 2
Step 2
Step 2
Step 2
Step 2

3-1-4

COMPRESSOR RECOVERY OPERATION

03-02

*

The character X represents the compressor(s) which was(were) stopped by a protection
function or compressor error while the number(s) represent(s) capacity (in horse power)
of the compressor(s) by which the recovery operation can be performed.

*

*

* * *

The heat exchanger capacity and four-way valve, solenoid valve, and electronic expansion valve operation states
are shown below.

1. Cooling, Cooling main

Pattern

1

2

3

4

5

6

OFF

ON

ON

OFF

ON

OFF

ON

OFF

ON

ON

OFF

OFF

ON

ON

OFF

OFF

OFF

OFF

ON

OFF

OFF

ON

OFF

ON

OFF

ON

OFF

OFF

ON

ON

4-way valve (4WV)

Solenoid valve

(SV)

Electronic expansion

valve (EEV)

Used heat

exchanger(HP)

4-way valve (4WV)

Solenoid valve

(SV)

Electronic expansion

valve (EEV)

Used heat

exchanger(HP)

4-way valve (4WV)

Solenoid valve

(SV)

Electronic expansion

valve (EEV)

Used heat

exchanger(HP)

Remarks

4WV2 4WV3 4WV4

SV7 SV8

Control pulse

Control pulse

0 pulse

Control pulse

Control pulse

Control pulse

EEV1

0 pulse

0 pulse

Control pulse

Control pulse

Control pulse

Control pulse

Cooling 2HP

Cooling 4HP

Cooling 6HP

Cooling 8HP

Cooling 10HP

Cooling 12HP

EEV2 2

4 6

2. Heating, Heating main

Pattern

1

2

3

4

5

6

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

OFF

OFF

ON

OFF

ON

OFF

ON

OFF

OFF

ON

ON

Remarks

4WV2 4WV3 4WV4

SV7 SV8

Control pulse

Control pulse

0 pulse

Control pulse

Control pulse

Control pulse

EEV1

0 pulse

0 pulse

Control pulse

Control pulse

Control pulse

Control pulse

Heating 2HP

Heating 4HP

Heating 6HP

Heating 8HP

Heating 10HP

Heating 12HP

EEV2 2

4 6

3. Stop and same capacity operation

Pattern

1

2

OFFONOFFONOFFONOFF

OFF

OFF

OFF

Remarks

4WV2 4WV3 4WV4 SV7 SV8

280 pulse

0 pulse

EEV1

280 pulse

0 pulse

Stop

Same capacity

EEV2 2 4 6

3-2 HEAT EXCHANGE CAPACITY CONTROL

03-03

1 ON /OFF

The outdoor fan motor is turned on with the compressor start and turned off with the compressor stop except for
the following cases. Also when

the operating mode of the outdoor unit is

changed, fan speed will be controlled under

new operating mode condition.

When the defrosting operation is performed
When the deicing operation is performed
When the same capacity mode is performed
When the overload protection operation during heating operation is performed

2 Fan Speed

The outdoor fan motor has the following five steps of speed in addition to Stop.

* Intermittent operation: Fan 1 rotates 20 secounds
at intervals of 50 seconds. Fan 2 stops all the time.

FAN SPEED

FAN 1

FAN 2

1

2

3

4

5

6

Hi

Hi

Lo

Lo

Intermittent *

Hi

Stop

Lo

Stop

Stop Stop

3-3

OUTDOOR FAN MOTOR CONTROL

03-04

(b) Fan speed of heating mode and heating main mode

The fan 1 and fan 2 rotate in High-High speed.

(c)

Same capacity fan control

When the operating mode of the outdoor unit is the same capacity mode, the fan fan1 and fan2 are turned off.

When the operating mode of the outdoor

unit

is changed from the same capacity operating mode to another

operating mode, the fan operates in accordance with the new operating mode.

3 Fan Speed Switching

(a) Fan speed of cooling mode, cooling main mode and oil recovery operation

The fowllowing table shows the fan speed associated with outdoor temperature.

OUTDOOR TEMPERATURE

NORMAL OPERATING MODE

SILENT OPERATING MODE

Fan speed switched according to outdoor temperature

THO>

1

3

1

>
=

THO>

>
=

THO>

>
=

THo

(THO)

3

1

4

5

3

4

5

30

C

30

C

27

C

27

C

18

C

>
=

THO>

18

C

6

C

6

C

03-05

Power source turned ON

Stand by

1) Purpose of the control

3-4 EXPANSION VALVES 1 AND 2 CONTROL

03-06

In order to balance the refrigerant flow rate of each heat exchanger and to adjust the refrigerant gas to an
optimum state, a feedback control of expansion valves 1 and 2 is performed by using operation date which
is obtained with thermistors and pressure sensors.

2) Operation flow chart of expansion valves

Initialization of
expansion valves

Does any of
the compressors
start to operate?

Automatic control
of expansion valves

Is any of the
compressors
operating?

Watching

Does any of
the compressors
start to operate?

Do expansion
valves need to be
initialized?

(Oil recovery or Defrosting
operation)

No

Yes

Yes

No

No

No

Yes

Yes

The expansion valves are initialized at intervals of 4 hours (about).

*

Expansion valves automatic
controlled

03-07

(1) Compressor(s) is(are) operating, except for the case that only compressor 1 (2HP) is operating

.

(2) Operatring mode is "Cooling" or "Heating".

1) Expansion Valve 3 Control

As there is a difference between compressor’s actual capacity (operating capacity) and required
capacty (from indoor units), the difference in capacity is bypassed as a circulating save amonunt.

( Operating capacity – required capacity )

2) Start condition

3) End condition

(1) Only commpressor 1 (2HP) is operating.
(2) When the operating mode is switched to other than " Cooling" or "Heating".

3-5

CIRCULATING SAVE AMOUNT CONTROL

The solenoid valve 2 is controlled according to the difference between operatiog capacity and required
capacity during the same capacity operatration mode.

3-6 SOLENOID VALVE 2 CONTROL

When all the following conditions are satisfied.

When any of the following condition is satisfied.

3-7 DEFROSTING CONTROL

03-08

1) Purpose of operation

By removing the frost that was formed on the surface of the outdoor unit heat eachanger, the defrosting operation
prevents a decline in heat transfer efficiency and realizes an efficient heating operation.

2) About the defrosting operation

(1) Starting condition of the defrosting operation

The defrosting operation starts when all the following conditions are satisfied.

Outdoor unit operation mode is "heating".
Integrated time which any of the compressors is operating has reached 40 minutes or longer.

(3) End condition of the defrosting operation
When any of the following conditions is satisfied, defrosting operation ends.

When compressor(s) starts to operation from "all compressors stopped" state, and has operated continuously for
more than 6 10 min.

Outdoor unit operation mode was switched to other than "Heating"
20 minutes or longer have elapsed since defrosting operation started.

The temperature of outlet of heat exchangers has become lower than the set temperature for starting a defrosting
operation. (See 2-3-2 for the information on defrost temperature setting.)

3) Others
During the defrosting operation the fans of indoor units stop,

appears on the display of wired and central

DEFROST

remote controller, and appears on the simple remote controller.
The operation indicators (LED) of the indoor units flash slowly.

The defrosting operation can also be performed by setting the forced defrost operation DIP SW 1- 4 from OFF to ON,
and keeping it at ON position for more than10 seconds. To stop the defrosting operation, set the DIP SW1- 4 to OFF.

(2) Defrosting start restrictions
When oil recovery operation is in progress or errors or protections (except for some) were generated, Defrosting
operation will not be performed even if the conditions mentioned above are satisfied.

Integration of compressor operation time after start of defrosting has exceeded 15 minutes.
The error was generated, except for some error conditions.
Each heat exchanger outlet temperature has reached defrosting end heat exchanger temperature 10 or higher.

2. Oil return solenoid valves

Individual oil return

Central oil return control

Solenoid valve Application

Solenoid valve SV3

SV4

SV5

SV6

Compressor 1

Compressor 2

Compressor 3

Compressor 1/2/3

3. Individual oil return control

When a compressor operates continuously for 1 minute or longer and any of the following conditions is satisfied,
the solenoid valve corresponding to the compressor opens for 10 seconds to return the oil accumulated in the
oil separator to the compressor.

(1) The integrated operating time of the compressor has reached 15 minutes or longer.
(2) The compressor is stopped.

4. Central oil return control

When any of the following conditions is satisfied, the solenoid valve SV6 opens on and central oil return control
begins.

(1) One or more compressors are operating and the integrated time of "1 or more compressors operating" state
exceeds 15 minutes
(2) All the compressors are stopped.

3-8 OIL RETURN CONTROL

OIL

SEPARATOR

OIL

SEPARA

OIL
SEPARA

COMP.1

COMP.2

COMP.3

SV3

SV4

SV5

SV6

There are two oil return controls, one is the individual oil return control
and the other one is centralized oil return control. When any of the
solenoid valves opens, the oil return is performed.

TOR

TOR

control

03-09

1. Two kinds of oil return control

Compressor 1

ON

OFF

Indoor Fan

3-9 OIL RECOVERY CONTROL

OFF

OFF

OFF

ON

ON

ON

Compressor 2

Compressor 3

4 9mins

1 min

Oil recovery start

Oil recovery end

03-10

Outdoor Fan

OFF

ON

1) Purpose of the operation

The amount of refrigerant machinery oil which has been transported to the indoor units and the connection pipe with the
refrigerant will become large as the operation time of compressor increase. It is necessary to recover the oil back into
the outdoor unit for a certain time interval in order to prevent compressors from damaging due to lack of lubrication oil.

2) About the oil recovery operation

When "oil recovery integrated time", which is the integrated operating time of any compressor in operation,
reaches to the certain time, the oil recovery operation starts.

The "oil recovery integrated time" to start the oil recovery is as follows.

- The first time of oil recovery after the power is turned on : 1 hour

- The second time and afterwards : At intervals of 4 6 hours

Please note that "oil recovery integrated time" is reset to zero at the end of defrosting operation.
The oil recovery operation can be performed by setting the forced oil recovery DIP SW2-4 from OFF to ON and keeping
it at ON position for more than 10 seconds.

3) The operation of compressors and fans

The following time chart shows the behavior of compressors, outdoor fan and indoor fan during oil recovery operation.

DEFROST

4) Others

During the oil recovery operation, appears on the display of wired and central remote controller,
and appears on the simple remote controller.
The operation indicators (LED) of the indoor units flash slowly.

1. Central discharge temperature protection

1) When the discharge temperature of any compressor reaches 110 C or higher, solenoid valve 1 (SV1)
is turned on and bypass is performed. SV1 is turned off and central discharge temperature protection
operation is ended by any of the following conditions:

(1) Discharge temperature of all compressors reaches 95 C or lower.
(2) Oil recovery operation starts.

2) When solenoid valve 1 (SV1) is on and the outdoor fan speed is "5"(about fan speed, please refer to 3-3),
solenoid valve 2 (SV2) is simultaneously turned on and bypass is performed. SV2 is turned off by any of
the following conditions:

(1) Outdoor fan speed is set to other than "5".
(2) Oil recovery operation starts.
(3) Discharge temperature of all compressors reaches 95 C or lower.

2. Discharge temperature protection

3. High-pressure protection

1) When the high-pressure SW (HP) is turned off except during oil recovery operation or defrosting,
solenoid 1 (SV1) and solenoid 2 (SV2) are turned on and bypass is performed. SV1 and SV2 are turned
off by any of the following conditions:

(1) High-pressure pressure SW turned on.
(2) Oil recovery control starts.
(3) Defrosting control starts.

2) When 1 minute has elapsed after SV1 and SV2 were turned on and the discharge pressure sensor
detected value is 3.34MPa or higher, compressors 1, 2, and 3 are stopped. SV1 and SV2 ON and
compressors 1, 2, and 3 stop are reset and high-pressure protection operation is ended by any of the
following conditions:

(1) High-pressure SW turned on.
(2) Oil recovery control starts.
(3) Defrosting control starts.

4. Heating overload protection

When the operating mode is " Heating " and the high-pressure SW was turned off except during oil recovery or
defrosting in the "Heat mode", the outdoor fan is stopped. Outdoor fan stop is reset and heat overload protection
operation is ended by any of the following conditions:

(1) High-pressure SW turned on.
(2) Oil recovery control starts.
(3) Defrosting control starts.
(4) Mode is switched to other than "Heat".

When the discharge temperature of any compressor reaches 130 C or higher, the corresponding compressor
stops. Compressor stop is reset and discharge temperature protection operation is ended by any of the following
conditions:

(1) Discharge temperature of all compressors reaches 95 C or lower.
(2) Oil recovery operation starts.

However, during oil recovery operation, discharge temperature protection is not performed.

3-10 PROTECTION FUNCTIONS

03-11

4 . INDOOR UNIT OPERATION

TM

R407C

4-1 TIMER CONTROL

There are three timer modes: "OFF TIMER", "ON TIMER" and
"WEEKLY TIMER" .

(1) Set the clock time when the unit is in the stop mode (only the

current time will be shown on the remote control unit display).

(2) While adjusting the current clock time, do not use other

remote control functions.

(3) Each time the TIMER button is pressed, the remote control

unit display will change in the order shown below:

Remote control button selected

OFF timer setting

1) OFF timer
When the timer mode is set to "OFF timer", operation automatically

stops when the set time has elapsed.

NON STOP

OFF

WEEKLY

ON

2) ON timer
When the timer mode is set to "ON TIMER" , operation automati-

cally starts when the set time has elapsed.

ON timer setting

3) WEEKLY timer
Use the weekly timer to set operating times for each day of the

week.

Weekly Timer Features

Set different operating times for each day of the week.

Set one or two operating spans (one or two ON times and one
or two OFF times) per day.

Set time to a resolution of 5 minutes.

OFF time can be carried over to the subsequent day.

Use the "DAY OFF" setting to cancel operation for any day of
the coming week (one-time cancellation).

ON

SET

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

COOL

CLOCK

OFF

C

TIMER

OFF
TIMER

4. INDOOR UNIT OPERATION

OFF

SET

04-01

1

2

Setting Up the Weekly Timer Operation

Press the START/STOP button to stop the air conditioner, and
then proceed as follows.

1. Press the TIMER MODE button so that "WEEKLY"
appears on the display.

The display now shows the current day (by DAY CODE), the
first ON and OFF times for the day (the "WEEKLY 1" times),
the fan speed, and the operating mode.
The top time value gives the ON time, and the bottom value
gives the OFF time.
If either time is not set, the corresponding time display is
blank " ".

2. Press the TEMP./DAY button to select the day that
you want to set up.

: Use to advance the day forward.
: Use to turn the day back.

3. Hold the SET button down for 3 seconds.

The "WEEKLY 1" ON time starts flashing, and the fan speed
and operating mode displays go off.

4. Press the SET TIME button to set the day's first ON time.

: Use to advance the day forward.

: Use to turn the day back.
(Press once to move the time 5 minutes; hold down and the
time will move 10 minutes at a time.)

8. Press the SET button.

This registers the first ON time setting for the selected day.
The ON time display stops flashing, and the "WEEKLY 1"
OFF time starts flashing.

9. Press the SET TIME button to set the day's first OFF time.

The earliest OFF time you can set is 5 minutes after the ON
time. The latest OFF time is 23:55 on the subsequent day.

10. Press the SET button.

This registers the first OFF time for the day, completing the
"WEEKLY 1" settings for that day.
The display switches to "WEEKLY 2", and the day's second
ON time begins flashing.

11. Repeat the operations described in Steps 4 to 10 to set
the second ON and OFF times for the day (the "WEEKLY 2" times).

When you press the SET button after setting the "WEEKLY 2"
OFF time, the system registers the "WEEKLY 2" settings for
the day and returns you to the "WEEKLY 1" ON time setup
process. (The first ON setting reappears and begins flashing.)
You can review your settings by pressing the SET button.
Each press moves you to the next setting, as follows.

DAY CODE

DAY OF THE WEEK

1

MON2TUE3WED4THU5FRI6SAT7SUN

If the timer is not set, press
the SET button with the
time display blank " ",
and perform next operation.

WEEKLY 1ONWEEKLY 1

OFF

WEEKLY 2ONWEEKLY 2

OFF

04-02

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

COOL

OFF

ON

DAY

TIMER

WEEKLY

1 2

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

1

2

9

8,
10

UTB - LB

*

COOL

OFF

ON

DAY

WEEKLY

1 2

1

2

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

OFF

ON

DAY

TIMER

WEEKLY

1

4

3

3

OFF

ON

DAY

WEEKLY

1

4

5, 7

6

6

OFF

ON

WEEKLY

8,
10

9

UTB - LA

*

5. Press the TIMER MODE button.

The day display changes to the set temperature display.

6. Press the MASTER CONTROL and the TEMP./DAY button.

Select the desired operation mode and temperature.

7. Press the TIMER MODE button.

End operation mode and temperature setting.

The following procedures of 5, 6, 7 is for UTB- LB type
wired remote controller. Goto 8 directly when UTB- LA
is used.

*

*

TIMER

NOTES:

(1) If no time values are flashing, the clock display will automatically reappear after 15 seconds if no buttons are pressed.
(2) A flashing time value indicates that the system is in time-setting mode. To return to the clock display you

must hold down the SET button for 3 seconds.

(3) You do not need to set values for both WEEKLY 1 and WEEKLY 2. If you wish, you can set values only for

WEEKLY 1 or only for WEEKLY 2.

(4) The allowable range for the day as time settings is shown below.

(5) If you set the OFF time to occur on the day following the ON

time, the NEXT DAY caption appears on the display.

Next day’s WEEKLY

settings

Cannot set

5 min.

Available range Cannot set

5 min.

ON OFF ON OFF

Previous day’s WEEKLY

settings

0:00 0:00

TIMER

NEXT DAY

DAY

WEEKLY

ON

OFF

21

Starting Weekly Timer Operation

1. Press the TIMER MODE button so that "WEEKLY"
appears on the display.

2. Press the START/STOP button to start operation.
(This step is not necessary if the air conditioner is already
running.)

Weekly timer operation starts, and the operation lamp comes on.
(If the current time is between the first or second ON and OFF
time settings for the current day, the air conditioner will start.
Otherwise the air conditioner will remain off.)

The day display is replaced by the temperature display.
The upper time display now shows the current time, and the
lower time display shows the next scheduled ON or OFF time.

To Stop Weekly Timer Operation

To stop weekly timer while leaving the air conditioner
running:

Press the TIMER MODE button to select NONSTOP,
OFF TIMER, or ON TIMER.

To stop weekly timer operation and the air conditioner
also:

Press the START/STOP button.

Reviewing the Time Settings

Press the START/STOP button to stop the air condition­er, and then proceed as follows.

1 Press the TIMER MODE button so that "WEEKLY"

appears on the display.

2 Press the TEMP./DAY button to select the day

that you want check.

3 Press the SET TIME button ( or ) to switch

between the "WEEKLY 1" or "WEEKLY 2" time dis­plays.

12. Press the SET TEMP./DAY button to select another day
for setup. The repeat steps 4 to 10 above to set the ON and
OFF times for that day.

13. When you have finished setting all of the times, hold

down the SET button for 3 seconds.
The WEEKLY display flashes for 3 seconds while the new
WEEKLY TIMER settings are registered, and then the clock
display reappears.

CLOCK

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

COOL

CLOCK

OFF

C

DAY

TIMER

WEEKLY

1

04-03

1

2

NOTES:

(1) The DAY OFF setting is only available for days for which weekly time settings already exist.
(2) You can make this setting for any of the next seven days (counting from the current day).
(3) The DAY OFF setting is effective over the range illustrated below. The weekly setting for which an ON time

has been set is eligible for the day in which the DAY OFF has been set.

(4) The display on the clock's lower line will usually be " " for the DAY OFF set day during weekly operations

Next day

ON OFF

0:00 0:00

Effective range of DAY OFF setting

WEEKLY setting for preceding

day

WEEKLY setting

Preceding day DAY OFF day

ON

OFF

About the DAY OFF setting

Use the DAY OFF setting to switch off timed operation for a selected day in the coming week.

This is a temporary, one-time setting. The DAY OFF setting is automatically cleared as soon as the specified day passes.

Precautions during setup

Setup is not possible in the following cases, so amend the time.

If you set an ON time while leaving the OFF time setting blank:

Nothing will happen when you press the SET button.

To proceed, press the SET TIME button and enter an appropriate setting.

When an attempt is made to set only the OFF time.

Nothing will happen when you press the SET TIME button.

Press the SET button and amend the entry for the ON time.

ON and OFF times cannot be set to the same value.

The OFF time cannot be set earlier than the ON time.

The WEEKLY 2 settings cannot be set earlier than the WEEKLY 1 settings.

The WEEKLY 1 and WEEKLY 2 time spans cannot overlap.

Using the DAY OFF Setting

Press the START/STOP button to stop the air conditioner, and
then proceed as follows.

1. Carry out steps 1 to 2 of the "Setting Up the Weekly
Timer Operation" procedure to select the day that you
want to set as the DAY OFF.

2. Press the DAY OFF button.
The DAY OFF setting is registered, and the DAY OFF caption
appears on the display.

To cancel the DAY OFF setting:
You can cancel the setting by pressing the DAY OFF button
again.

Example : To switch off timed operation for day 2

(Tuesday).

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

CLOCK

OFF

ON

DAY

TIMER

WEEKLY

DAY OFF

1

COOL

CLOCK

C

TIMER

WEEKLY

DAY OFF

COOL

04-04

2

Cancelling Selected Time Settings

Press the START/STOP button to stop the air conditioner, and
then proceed as follows.

1. Carry out steps 1 to 3 of the "Setting Up the Weekly TImer
Operation" procedure to select the day you want to edit.

2.

Press the SET button to select the ON time that you want to cancel.

To Change Selected Time Settings

Press the START/STOP button to stop the air conditioner, and
then proceed as follows.

1. Carry out steps 1 to 3 of the "Setting Up the Weekly Timer
Operation" procedure to select the day you want to edit.

2.

Press the SET button to select the time that you want to change.

The selected setting flashes on the display. Each press
moves you to the next setting for the selected day, as follows.

3. Hold down the side of the SET TIME button until the
time display becomes blank " ".

4. Press the SET button.

The first OFF time setting ("WEEKLY 1" OFF time) is deleted
and replaced by a flashing blank pattern " ".

5. Press the SET button again.

This completes deletion of the "WEEKLY 1" ON/OFF settings.
The second ON time setting ("WEEKLY 2" ON time) appears
and flashes.
If you wish to delete other time settings, repeat steps 2
through 5.

6. Once the setting has been canceled, hold down the SET
button for 3 seconds.

The WEEKLY display flashes briefly, and then the clock dis­play appears.

TIMER

DAY

WEEKLY

AUTO

ON

OFF

TIMER
MODE

START/STOP

CLOCK ADJUST

SET TIME TEMP./DAY FAN

CONTROL

MASTER

CONTROL

21

AUTO

DEFROST TEST

SET

DAY OFF

2

3

TIMER

DAY

WEEKLY

AUTO

ON

OFF

21

AUTO

DEFROST TEST

TIMER

DAY

WEEKLY

AUTO

ON

OFF

21

AUTO

DEFROST TEST

Be sure to select an ON time (the upper time display).

Example : Clearing the "WEEKLY 1" ON/OFF

times for day 4 (Thursday).

Example : Changing the "WEEKLY 2" ON setting

for day 5 (Friday) from 14:00 to 15:30.

WEEKLY 1ONWEEKLY 1

OFF

WEEKLY 2ONWEEKLY 2

OFF

NOTES:

In the following cases, cancel the set time prior to making the required amendments.
(1) If you want to change the ON time to a time that is later than the currently set OFF time.

(2)

If the change would cause a temporary overlap between the first and second ON/OFF time spans.

ON OFF

WEEKLY 1

ON OFF

WEEKLY 1

Change

Time

Time

Temporary overlap

Change

Time

Time

ON OFF

WEEKLY 1

ON OFF

WEEKLY 2

OFF ONON OFF

WEEKLY 1 WEEKLY 2

3. Press the SET TIME button to change the time setting.

4. Press the SET button.

The new setting overwrites the previous setting.

5. Once the setting has been canceled, hold down the SET
button for 3 seconds.

The WEEKLY display flashes briefly, and then the clock dis­play appears.

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

OFF

ON

DAY

TIMER

WEEKLY

1

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

OFF

ON

DAY

TIMER

WEEKLY

2

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

OFF

ON

DAY

TIMER

WEEKLY

2

04-05

2

3

2

4

3

Fan speed zone

Hi zone

Med zone

Low zone

When the room
temperature decreases

When the room
temperature increases

2) HEATING OPERATION

3) DRY OPERATION

An example for heat operation

Indoor heat
exchanger
temperature (THE )

Indoor fan speed
mode

47

41

HI
MED
LOW
OFF

(2)

(1)

(3)

TIME -->

2min.

2min.

2min.

2min.

THE

The indoor fan operates at the fan speed set with the FAN CONTROL mode button.

4) FAN OPERATION

The indoor fan rotates continuously at "Lo" speed.

1) COOLING OPERATION

• Expansion

• valve

• Indoor fan
motor

ON
OFF

OPEN
CLOSE

ON

ON

ON

ON ON ON

ON

ON

30s

30s

5s

3min

5s

3min

The indoor fan always rotates at "Lo" speed.

TIME -->

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

AUTO

CLOCK

C

NON STOP

•

•

04-06

2

TR-TS

1

2

TR-TS

1

TR-TS

2

TR-TS

2

3

TR-TS

3

TR-TS

(1) When the TS is changed.
(2) When the operation mode is changed from other mode to "COOL".
(3) When the fan control is changed from other position to "AUTO".

The fan speed is determined automatically in accordance
with the condition "(TR(corrected room temperature) - TS
(corrected set temperature)" as shown on the right.
However, the fan speed zone is determined in the manner
as the room temperature increases for the following cases.

2min.

(1) The indoor fan starts operation 5 seconds after the electric expansion valve opens. However, when the indoor unit just starts
its operation or the operation mode is changed from other to "DRY" and the refrigerant circulation is not stopped, the fan will
rotate immediately without a delay time of 5 seconds.
(2) The indoor fan will stop in 30 seconds when the refrigerant circulation stops.
(3) The indoor fan will stop immediately when the indoor unit is stopped by pushing the stop button or by a setting of ON timer.
(4) When the refrigerant circulation is stopped due to a lower room temperature for more then 3 minutes, the fan will rotate
2 minutes at intervals of 3 minutes.
(5) When the indoor unit just starts its operation or the operation mode is changed from other to "DRY" and the refrigerant
circulation is stopped, the fan will rotate for 1 minute and then it will operate according to the statement (4).

2min

(1) When the indoor heat exchanger temperature reaches 47 or more, the fan speed switches to the next higher position.
("LOW" --> "MED", "MED" --> "HIGH").
(2) When the indoor heat exchanger temperature drops below 41 while the refrigerant circulation of the indoor unit is ON,
the fan speed switches to the next lower position ("HIGH" --> "MED", "MED" --> "LOW").
(3) After switching the fan speed, it does not switch again within 2 minutes.
(4) When "FAN CONTROL" is switched from a set fan speed to "AUTO" after the cold air prevention is released , the fan of
indoor unit will start at "MED" speed for THE or at "LOW" speed for THE .

41

41

4-2 FAN CONTROL

4-2-1 "AUTO" POSITION

4-2-2 "LOW", "MED" AND "HIGH" POSITION

Indoor fan motor

Operates according to

the AIR FLOW-MODE

setting, and besides

Operates according

to the AIR FLOW-

MODE setting.

Operates according to the

AIR FLOW-MODE setting,

and besides

Cold air prevention

Defrost operation

See the fan control

page.

Cool Fan Heat Dry

Drain pump

Turns ON-OFF by the drain pump control function

Electrical
expansion valve

Pulse controlled by

the temperature differ-

ence calculation and

frost prevent fuction

Stop pulse

Pulse controlled by the

temperature difference

caculation and the

defrosting function

Each operating mode is controlled as below.

4-3-1 OPERATING MODE CONTROL

4-3 MASTER CONTROL

frost prevention
operation

Pulse controlled by
the temperature dif­ference calculation
and frost prevent
function

RB
Unit

Discharge valve

(SVD)

Suction valve

(SVS)

By-pass
valve

SVB1

SVB2

Open

Open

Open

Close

Close

Open

Open

Close

Close

Open

Close

Stop pulse

Stop

Off

Schematics of the RB units

UTF-Y90A4A

Indoor
unit 1

Indoor
unit 2

Indoor
unit 3

Indoor
unit4

Gas

pipe

Liquid

pipe

Suction pipe

Discharge pipe

Liquid pipe

SV

S

SV

B2

SV

S

SV

S

SV

S

SV

D

SV

D

SV

D

SV

D

SV

B1

SV

B1

SV

B1

SV

B1

SV

B2

SV

B2

SV

B2

Gas

pipe

Gas

pipe

Gas

pipe

Liquid

pipe

Liquid

pipe

Liquid

pipe

To indoor unit

Gas

pipe

Suction

pipe

Discharge

pipe

SV

S

SV

B2

SV

D

SV

B1

UTF-Y54A1A

: Strainer
: Solenoid valve

: Capillary tube

04-07

Close

Open

Open

Close

Close

Close

Close

Close

Close



(1) When AUTO CHANGEOVER is selected, the air conditioner selects the appropriate operating mode (Cooling or Heating)

according to your room's present temperature.

(2) When AUTO CHANGEOVER is first selected, the fan will operate at very low speed for about one minute while the unit

determines the current conditions of the room and accordingly selects the proper operating mode.



(3) When the air conditioner has adjusted your room

's temperature to near the set temperature, it will begin monitor opera­tion. In the monitor operating mode, the fan will operate at low speed. If the room temperature subsequently changes, the
air conditioner will once again select the appropriat

e operation (Heating, Cooling) to adjust the temperature to the set temperature.



(4) If the mode automatically selected by the unit is not satisfactor, you can change the operating mode by press the MASTER

CONTROL button to select the desired mode.

AUTO COOL

DRY

FAN HEAT

4-3-2 "AUTO" (Auto changeover) POSITION

During operation
or
Start of operation

Operating mode : AUTO
is selected

Detecting the room
temperature (TR)

TR

<
=

TS-2DEG.

TR

>
=

TS+2DEG.

Heating operation

Refrigerant

Circulating stopped?

(due to temp.)

Refrigerant

Circulating stopped?

for more than

Is

6min.

Cooling operation

Refrigerant

Circulating stopped?

(due to temp.)

Refrigerant

Circulating stopped?

for more than

Is

6min.

NO

NO

YES

YES

YES

YES

YES

YES

NO

NONO

NO

TS: Corrected setting temperatured

TR: Corrected room temperatured

04-08

4-3-5 "FAN" POSITION

(1) In this position, the fan merely rotates to circulate air, so the room temperature will not change.
(2) The fan will rotate at a fan speed set with the FAN CONTROL button.
(3) When only the “FAN” mode is being used, setting the fan speed at “AUTO” is equivalent to setting it at “Low”.

04-09

An example for COOLING TEMPERATURE CONTROL time chart (Manual setting)

When using the cooling mode, set the temperature to a value lower than the current room temperature, otherwise

the indoor unit will not start the cooling operation and only the fan will rotate.

4-3-3 "COOL" POSITION

4-3-4 "HEAT" POSITION

(1) When using the heating mode, set the temperature to a value higher than the current room temperature, otherwise

the indoor unit will not start the heating operation.

(3)

An example for HEATING TEMPERATURE CONTROL time chart (Manual setting)

During defrosting, the OPERATION indicator lamp flashes 3 sec. ON and 1 sec. OFF, and repeat. The heating operation
will be temporarily interrupted.

• Indoor fan

Ts

• Opening of
EEV

100%
0%

• Refrigerant
flow

ON
OFF

ON
OFF

• Temperature

Ts + T1

Ts - T2

TR

3Min.

Ts : Corrected setting temperature
TR : Corrected room temperature

• Indoor fan

Ts

• Opening of
EEV

100%
0%

• Refrigerant
flow

ON
OFF

ON
OFF

• Temperature

Ts + T3

Ts - T4

TR

4Min.

1Min.

4Min.

1Min.

4Min.

1Min.

Ts +T1 : The thrshold temperature of start of refrigrant flow
TR - T2 : The thrshold temperature of stop of refrigrant flow

Ts : Corrected setting temperature

TR : Corrected room temperature

Ts +T3 : The thrshold temperature of start of refrigrant flow

TR - T4 : The thrshold temperature of stop of refrigrant flow

: Duration of cold air prevention

(2) After the start of heating operation, the fan of indoor unit will not rotate until the heater exchange is warmed up to
blow out warm air.

Instructions relating to heating ( ) are applicable only to heat pump type
outdoor unit.

Begin air conditioner operation before performing this procedure.

Vertical Air Direction Adjustment

This instructions are applicable to "LARGE CEILING TYPE",
"UNIVERSAL FLOOR/CEILING TYPE", "CASSETTE TYPE",
"WALL MOUNTED TYPE","COMPACT WALL MOUNTED TYPE"
and "CEILING WALL TYPE".

Press the VERTICAL AIR FLOW DIRECTION SET button.

Each time the button is pressed, the air direction will change as
follows, expept for compact wall mounted type indoor units operating
under cooling mode.

LARGE CEILING TYPE

The remote controller's display does not change.

UNIVERSAL FLOOR/CEILING TYPE

CASSETTE TYPE

Example : When set to vertical air direction.

DANGER!

(1) ADJUSTING THE DIRECTION OF AIR CIRCULATION

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

WALL MOUNTED TYPE

1 2 3 4

1

2

3

4

1

2

3

4

1

2

3

4

3

4

04-10

2

1

Never place fingers or foreign objects inside the
outlet ports, since the internal fan opertes at
high speed and could cause personal injury.

Always use the remote control umit's
AIR FLOW DIRECTION button to adjust
the UP/DOWN air direction flaps or
RIGHT/LEFT air direction louvers. At­tempting to move them manually
could result in improper operation; in
this case, stop operation and restart.
The louvers should begin to operate
properly again.
During use of the Cooling and Dry
modes, do not set the UP/DOWN air
direction flaps in the position of
(Compact wall mounted type &
long periods of time, since water vapor
may condense near the outlet port and
drops of water may drip from the air
conditioner.
When used in a room with infants, chil­dren, elderly or sick persons, the air
direction and room temperature
should be considered carefully when
making settings.

4

CEILING WALL TYPE

For compact wall mounted type indoor units operating under
cooling mode.

1 2

4

3

for

COMPACT WALL MOUNTED TYPE

Cooling &
Heating

Heating

4-4 LOUVER CONTROL

1

2

3

4

1

2

3

4

Horizontal Air Direction Adjustment

This instructions are applicable to "LARGE CEILING TYPE",
"UNIVERSAL FLOOR/CEILING TYPE", "WALL MOUNTED TYPE"
and "CEILING WALL TYPE".

Press the HORIZONTAL AIR FLOW DIRECTION SET button.

Each time the button is pressed, the air direction range will
change as follows:

The remote controller's display does not change.

LARGE CEILING TYPE

UNIVERSAL FLOOR/CEILING TYPE

WALL MOUNTED TYPE

Example : When set to horizontal air direction.

Use the air direction adjustments within the ranges shown above.

The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

During Cooling mode : Horizontal flow
During Heating mode : Downward flow

During AUTO mode operation, for the first minute after beginning operation, airflow will be horizontal ,
the air direction cannot be adjusted during this period.

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

(2) SWING OPERATION

Instructions relating to "the indoor unit's indicator lamp" ( ) are applicable to "LARGE CEILING TYPE", "UNIVERSAL
FLOOR / CEILING TYPE", "CASSETTE TYPE", "WALL MOUNTED TYPE","COMPACT WALL MOUNTED TYPE" and
"CEILING WALL TYPE".

Begin air conditioner operation before performing this procedure.

To select Vertical airflow SWING Operation

This instructions are applicable to "LARGE CEILING TYPE", "UNIVERSAL FLOOR/CEILING TYPE",
"CASSETTE TYPE", "WALL MOUNTED TYPE", "COMPACT WALL MOUNTED TYPE" and "CEILING WALL TYPE".

1

4

1

1 2 3 4 5

1

3

4

5

2

04-11

1

2

3

4

5

1

2

3

4

5

CEILING WALL TYPE

Press the VERTICAL SWING button for more than two seconds.

The remote controller's VERTICAL SWING lamp (orange) **and
indoor unit's SWING indicator lamp (VERTICAL SWING)
(orange) will light up.
In this mode, the UP/DOWN air direction flaps will swing automat­ically to direct the air flow both up and down.

Example : When set to vertical swing.

MASTER
CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

Instructions relating to "the indoor unit's indicator lamp" (**) are
applicable to "LARGE CEILING TYPE", "UNIVERSAL FLOOR /
CEILING TYPE", "CASSETTE TYPE", "WALL MOUNTED TYPE",
"COMPACT WALL MOUNTED TYPE" and "CEILING WALL TYPE".

About Vertical Airflow SWING Operation

The range of swing is relative to the currently set airflow direc­tion.

If the swing range is not as desired, use the remote controller's
VERTICAL AIR FLOW DIRECTION SET button to change the
range of swing.

The SWING operation may stop temporarily when the air condi­tioner's fan is not operating, or when operating at very low
speeds.

About Horizontal Airflow Swing Operation

The range of swing is relative to the currently set airflow direc
tion.

If the swing range is not as desired, use the remote controller's
HORIZONTAL AIR FLOW DIRECTION SET button to change
the range of swing.

The SWING operation may stop temporarily when the air condi­tioner's fan is not operating, or when operating at very low speed.

Air flow direction set

Range of swing

to
to
to

to (All range)

Air swing range (Expect for compact wall mounted type indoor unit)

Air direction range

To select Horizontal Airflow SWING Operation

This instructions are applicable to "LARGE CEILING TYPE",
"UNIVERSAL FLOOR / CEILING TYPE", "WALL MOUNTED TYPE"
and "CEILING WALL TYPE".

Press the HORIZONTAL SWING button for more than two seconds.

The remote controller's HORIZONTAL SWING lamp (orange)
**and indoor unit's SWING indicator lamp (HORIZONTAL
SWING) (orange) will light up.
In this mode, the RIGHT/LEFT air direction louvers will swing
automatically to direct the airflow both right and left.

To stop Horizontal airflow SWING Operation

Press the HORIZONTAL SWING button for more than two seconds
once and again.

The remote controller's HORIZONTAL SWING lamp **and indoor
unit's SWING indicator lamp (HORIZONTAL SWING) will go out.
Airflow direction will return to the setting before swing was begun.

Example : When set to horizontal swing.

To Stop Vertical airflow SWING Operation

Press the VERTICAL SWING button for more than two seconds
once and again.

The remote controller's VERTICAL SWING lamp **and indoor
unit's SWING indicator lamp (VERTICAL SWING) will go out.
Airflow direction will return to the setting before swing was begun.

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

Air flow direction set

Range of swing

to (All range)

to
to
to

to (All range)

1

2

3

4

1

2

2

3

4

4

1 4

1

1

2

3

1 5

3

4

5

5

5

4

3

2

1

04-12

Air flow direction set

Range of swing

to
to

1

2

3

4

1

2

3

4

Air swing range (Compact wall mounted type indoor unit)

or
or

Air swing range

04-13

4-5 ENERGY SAVE OPERATION

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

COOL

FAN

DRY

HEAT

AUTOAUTO

CLOCK

OFF

OFF

ON

ON

C

F

NEXT DAY

DAY

TIMER

NON STOP

OFFON

TIMER
WEEKLY

ANTI FREEZE

CENTRAL

DAY OFF

DEFROST

TEST

12

(3) To Stop the ENERGY SAVE

Press the ENERGY SAVE button one more time.

The ENERGY SAVE mode will be turned off.

The ENERGY SAVE light goes off, and the unit will return to the former operat­ing conditions.

(2) To Use the ENERGY SAVE

Press the ENERGY SAVE button.

The unit will run in the ENERGY SAVE mode.

(1) About the ENERGY SAVE

The energy conservation mode (ENERGY SAVE) raises the set temperature slightly in the cooling mode and lowers the set
temperature in the heating mode, using a computer program to economically control the operation of the unit.

If you press the ENERGY SAVE button while the air conditioner is on , it will change to the conservation mode. if you press
the ENERGY SAVE button while the unit is in the timer mode (ON timer or WEEKLY timer), the unit will go into
the conservation mode when the unit starts with the timer.

If you turn off the air conditioner while in the conservation mode, the mode will be shut off.

When Heating

After the ENERGY SAVE button is pressed, the set tempera­ture will be lowered about 1 C every 30 minutes. When it
has lowered a total of 4 C, than it will hold that tempera­ture.

When Cooling

After the ENERGY SAVE button is pressed, the set tempera­ture will be raised about 0.5 C every 30 minutes. When it
has gone up a total of 1 C, then it will hold that tempera­ture.

30 min.

0.5 C

1 C

Set to the ENERGY SAVE mode.

1 C

2 C

30 min.



Set to the ENERGY SAVE mode.

60 min.

90 min.

3 C

4 C

(2) To Use the ANTI FREEZE

Press the VERTICAL AIR FLOW DIRECTION and the HORIZONTAL AIR FLOW
DIRECTION SET Button at the same time for more than three seconds.
This operation is only enabled with the remote controller set to stop mode.

(3) To Stop the ANTI FREEZE

Press the VERTICAL AIR FLOW DIRECTION and the HORIZONTAL AIR FLOW
DIRECTION SET Button at the same time for more than three seconds once again.
This operation is only enabled with the remote controller set to stop mode.

(1) About the ANTI FREEZE

The freeze prevention fuction operates when the START/STOP button is pressed
and the remote controller is in stop mode (indoor unit is in stop mode). When­ever the room temperature falls to 5 C, it automatically sets the fan to low
speed and starts the heating operation. This operation stops when the tempera­ture in the room rises reaches 8 C.

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

COOL

FAN

DRY

HEAT

AUTOAUTO

CLOCK

OFF

OFF

ON

ON

C
F

NEXT DAY

DAY

TIMER

NON STOP
OFFON
TIMER
WEEKLY

ANTI FREEZE

CENTRAL

DAY OFF

DEFROST

TEST

12

4-6 ANTI FREEZE CONTROL

04-14

After the power is turned on, the following operation is controlled automatically to control the most suitable refrigerant
charge according to the operation mode and operation conditions of each unit.

Electronic expansion valve control process.

The electronic expansion valve adjusts the opening by selecting the number of pulses from the rated capacity,operation
mode ( cool / heat ) and set temperature of each indoor unit.

(1) The air conditioner restarts with the previous setting operation.
(2) When the air conditioner restarts, the "THREE MINUTE DELAY FUNCTION" operates.

When the air conditioner restarts, the " THREE MINUTE DELAY FUNCTION " operates.

(3) When the air conditioner restarts for heating operation, the "COLD AIR DISCHARGE PREVENTION FUNCTION"
operates.

(1) When cooling and refrigerant circulation starts, the drain pump starts simultaneously.
(2) The drain pump operates continuously for 3 minutes after the refrigerant circulation stopped.
(3) When the refrigent circulation is stopped by a start of indoor heat exchanger frost provention
operation, the drain pump will turn off in 1 hour after the end of indoor heat exchanger frost
provention operation.
(4) When the water level in the drain pan rises up and then the float switch functions:

Microcomputer stops the refrigerant circulation and indoor fan motor operation.
Drain pump operates continuously for 3 minutes after the float switch is turned off.

(Almost condensing water may be drained)
(5) When the float switch turns ON continuously for 3 minutes, 'FAILURE INDICATION' operates.
(6) When the float switch turns OFF within 3 minutes, the unit starts cooling operation.

1
2

4-9 DRAIN PUMP OPERATION

4-8 AUTO RESTART

4-7 ELECTRONIC EXPANSION VALVE CONTROL

04-15

5 . TROUBLE SHOOTING

TM

R407C

Operation can be checked by lighting and flashing of the LED (OPERATION, TIMER, SWING) of the grille display section.
Perform judgment in accordance with the following.

Test run

When the air conditioner is operating in test run mode, the OPERATION and TIMER lamps flash slowly at the same time.

Error

The OPERATION, TIMER and SWING lamps operate as follows (refer to 5-1-2) according to the error contents.

SWING

TIMER

OPERATION

MANUAL

AUTO

OPERATION LAMP (Red)

TIMER LAMP (Green)

SWING LAMP (Orange)

5-1 INDOOR UNIT

5. TROUBLESHOOTING

5-1-1 NORMAL OPERATION DISPLAY

OPERATING CONDITION INDICATOR LAMP FLASHING PATTERN

Operation
lamp (red)

Timer lamp
(green)

Operation
lamp (red)

Timer lamp
(green)

Operation
lamp (red)

Test run

*1 Stop

Defrosting operation

(Heating operation)

or

Oil recovery operation

*2

Note: Indicator lamps are on the front panel of the indoor unit.

*1: If a power failure occurred, the lamps of operation and timer flash on and off alternately when the power returns.
*2: While the indoor fan motor stops, the operation lamp flashes on and off.

1.0 sec 1.0 sec

ON
OFF

1.0 sec 1.0 sec

ON
OFF

1.0 sec 1.0 sec

ON
OFF

1.0 sec 1.0 sec

ON
OFF

3.0 sec 1.0 sec

ON
OFF

05-01

SWING

SWING LAMP (Orange)

(

Auto-restart disable
DIP SW 2-4 : OFF

( )

5-1-2 ABNORMAL OPERATION DISPLAY

05-02

Error display

OPERATION

lamp

0.1sec

0.1sec

TIMER

lamp

0.1 sec

0.1 sec

0.1 sec

VERTICAL

SWING lamp

0.1 sec

2 times

3 times

3 times

3 times

4 times

5 times

0.1 sec

0.1 sec

0.1 sec

0.1 sec

0.1 sec

1 times

5 times

6 times

0.1 sec

0.1 sec

2 times

3 times

1 times

2 times

7 times

0.1 sec

3 times

4 times

4 times

5 times

5 times

6 times

7 times

3 times

1 times

2 times

1 times

2 times

Error contents

Model information abnormal

Power supply frequency abnormal

Room temperature thermistor error

Indoor unit heat exchanger thermistor (inlet) error

Indoor unit heat exchanger thermistor (middle) error

Indoor unit heat exchanger thermistor (outlet) error

Drain abnormal

Communication error 1

(indoor unit

Microcomputer error

Indoor unit fan error

Blower temperature thermistor error

Outdoor unit error

EEPROM access error

EEPROM deletion error

Transmission error

Node setting error

Parallel communication error

Room temperature abnormal

0.1 sec

0.1 sec

0.1 sec

0.1 sec

0.1 sec

0.1 sec

0.1 sec

ON/OFF

ON/OFF

flashing

flashing

flashing

flashing

flashing

flashing

flashing

flashing

flashing

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

ON/OFF

flashing

flashing

flashing

flashing

flashing

flashing

flashing

ON/OFF

flashing

flashing

flashing

flashing

flashing

flashing

flashing

flashing

flashing

flashing

HORIZONTAL

SWING lamp

Goes off

0.1 sec
ON/OFF

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Wired/Simple remote controller)

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

Goes off

5 times

0.1 sec

4 times

Communication error 2

flashing

ON/OFF

flashing

Goes off

(indoor unit

Wired/Simple remote controller)

Display Type

LED 1

LED 2

LED 3

LED 4

LED 5

LED 6

Cooling operation
He

ating operation
Cooling main operation
Heating main operation
Same performance operation

Compressor output STEP1
Compressor output STEP2
Compressor output STEP4
Compressor output STEP5
Compressor output STEP6
Compressor output STEP7

Heat exchanger usage ca

pacity STEP1

Heat exchanger

usage

capacit

y STEP2

Heat

exchanger

usage

capacity STEP3

Heat

exchanger usage capacity STEP4
Heat exchanger usage capacity STEP5
Heat exchanger usage capacity STEP6

Oil recovery operation
Defrosting operation
Test run

Medium pressure
High pressure

Low pressure by-pass

Display Method

( )

: Lighted continuously
: 0.5sec ON/0.5sec OFF fl

ashing

: Flashing times

(1)
(2)
(3)
(4)
(5)

(1)
(2)
(3)
(4)
(5)
(6)

(1)
(2)
(3)
(4)
(5)
(6)

(1)
(2)
(3)

(1)
(2)

5-2 OUTDOOR UNIT

5-2-1 NORMAL OPERATING DISPLAY

OUTDOOR PRINTED CIRCUIT BOARD LAYOUTS

LED 6

LED 5

LED 4

LED 3

LED 2

LED 1

IC

0.5SEC

0.5SEC

2SEC

ON

OFF

ON

OFF

display

LED 1

LED 2-6

Under initialization of expansion valve

Low pressure by-pass

Operation

05-03

Display method

: 0.1 sec ON / 0.1 sec OFF flashing
: 0.3 sec ON / 0.3 sec OFF flashing
: Flashing times

( )

{

5-2-2 ABNORMAL OPERATION DISPLAY

Error display

0.1sec

0.1sec

0.1 sec
ON/OFF
repeated

0.3sec

0.3sec

2sec

ON

ON

OFF

OFF

LED 1

LED 2-6

Display type

Liquid pressure sensor error

Heat exchange outlet thermistor 3 error
Heat exchange inlet thermistor 1 error
Heat exchange inlet thermistor 2 error
Heat exchange inlet thermistor 3 error
Suction thermistor error
Outdoor thermistor error

Model information error

LED 1

LED 2

LED 3 LED 4

LED 5

LED 6

(1)
(2)
(3)
(4)
(5)
(6)
(7)

(9)

(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)

(1)
(2)

(7)

(1)

(3)
(4)
(6)
(7)

(1)

Power supply frequency abnormal

Transmission error

Node setting error

(2)

(8)

(9)

Compressor 1 error

Compressor 2 error

Compressor 3 error
Discharge temperature 1 error
Discharge temperature 2 error
Discharge temperature 3 error
High-pressure error
Pump down error

Discharge temperature thermistor 1 error
Discharge temperature thermistor 2 error
Discharge temperature thermistor 3 error

Heat exchange outlet thermistor 1 error
Heat exchange outlet thermistor 2 error

Discharge pressure sensor error

Oil recovery error

Reverse phase blocker error

EEPROM access error

EEPROM deletion error
Outdoor unit circuit bord error 1
Outdoor unit circuit bord error 2

Indoor unit error

Reverse phase blocker error

Outdoor unit circuit bord error 2

05-04

Error Code

Error Code

Error contents

Model information abnormal

No error

Power supply frequency abnormal

EEPROM access error

EEPROM deletion error

Room temperature themistor error

Indoor unit heat exchanger themistor

Indoor unit heat exchanger themistor

Indoor unit heat exchanger themistor

Blower temperature themistor error

Drain abnormal

Room temperature abnormal

Indoor unit fan error

Transmission error

Node setting error

Parallel communication error

5-3 REMOTE CONTROLLER

MASTER

CONTROL

FAN

CONTROL

TIMER
MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

MASTER

CONTROL

FAN

CONTROL

TIMER

MODE

TEMP./DAY

SET TIME

CLOCK ADJUST

START/STOP

SET

DAY OFF

ZONE

ENERGY SAVE

COOL

CLOCK

C

NON STOP

Outdoor unit error

(middle) error

(inlet) error

(outlet) error

05-05

Remote controller
address

SET

SET

Error Code

Remote controller
address

If there is a problem with the air conditioner it will stop
running and " EE:EE " will be displayed.

(1) If the operation lamp is on then press

button to turn it off.

(2) Press the

and the

buttons at the same time
for more than three seconds to start the self diagnosis
check.

An error code will be displayed display area.

(3) Press the

and the

buttons again for more than

three seconds to end the self diagnosis check.

Error code history can be displayed. Please refer to
"Installation Instruction Sheet" of the remote controller.

If there is a problem with the air conditioner, it will
stop running and " EE:EE " will be displayed instead
of the clock.

Error code displayed on wired or simple remote controller

(1) If the operation lamp is on then press START/
STOP button to turn it off.
(2) Press the SET TIMER button ( ) and SET
TEMP./DAY button ( ) at the same time for more
than three seconds to start the self diagnosis check.

An error code will be displayed in the clock display area.
(3) Press the SET TIMER button ( ) and SET
TEMP./DAY button ( ) again for more than three
seconds to end the self diagnosis check.

5-3-1 WIRED REMOTE CONTROLLER

5-3-2 SIMPLE REMOTE CONTROLLER

Error code history can be displayed when UTB- LB type
wired remote controllers is used.Please refer to
"Installation Instruction Sheet" of the controller.

If the and the number for the central control number flash during operation, there is an

error at the relevant remote control group. Start the error monitor, identify the error and remove the

cause.

When the error monitor is started, the following can be performed.

The error code for each remote control group (indoor units) is displayed.

Up to two of the past error codes are displayed for each of the indoor units, the outdoor units and
the central remote controller group.

(1) Press

CHECK

to start the error monitor.

The LCD changes to the error monitor screen.

(2) Press to select the central control

number for which its details of the error contents

are to be confirmed. (The number of the caus-

ing the error is flashing.)

(3) Press to select the display mode for the error

code.

Each press of will switch the display as shown

below.

Current error code First previous error code

Second previous error code

CHECK

ACL

MASTER

ENERGY ANTI

FAN

TIMER

SET

TIMER

DELETE

TIMER

DAY

CLOCK

ADJUST

DAY OFF

TEMP.

MEMORY
OPERATION

MEMORY

TEST

SET

CENTRAL

DELETE

BACK

GROUP

ZONE

ON OFF

TIME

CONTROL

CONTROL

FILTER
RESET

CONTROL

FREEZE

COPY

TIMER
MODE

SAVE

SETTING SETTING

5-3-3 CENTRAL REMOTE CONTROLLER

(3) (2)

(4) (1), (5)

05-06

(4) Press to select the indoor units in the remote control group selected in 3.

TIME

Continue pressing , the error codes for the outdoor unit and the central re-

TIME

mote controller are displayed. Each of the displays is shown below.

(5) Press

CHECK

again to end the error monitor.

If there have been multiple

errors for one unit, continually

pressing will display the

TIME

error codes in sequence.
When all the error codes have
been displayed, the display
will switch to the next unit.

If there is no error in the
central control number selected
in 3, the display will not change

when is pressed. "00"

TIME

displayed means "no errors".

"The refrigerant system address and indoor unit
address are displayed."

"Refrigerant system address" and "-0" are displayed.

The "C" code and the central remote controller
address are displayed.

TIME

TIME

TIME

Indoor unit
error display

Outdoor unit
error display

Central remote

control error

display

05-07

Error
Code

Indoor unit error Outdoor unit error Central remote controller

00
01 – – –
02 Model information abnormal

No error No error No error

Model information error

Printed circuit board error (Control panel)

03

Microcomputer communication error Microcomputer communication error

Printed circuit board error (Transmission adaptor)

04

Power supply frequency abnormal Power supply frequency abnormal Memory error

05

– Reverse phase blocker error Node setting error

06

EEPROM access error Parallel communication error

07

EEPROM deletion error – –

08

– – –

09

Room temperature thermistor error Compressor 1 error –

0A

Heat exchanger thermistor (middle) error

Compressor 2 error –

0B

Heat exchanger thermistor (inlet) error

Compressor 3 error –

0C

Heat exchanger thermistor (outlet) error

– –

0D

Blower temperature thermistor error

Discharge temperature thermistor 1 error

–

0E

–

Discharge temperature thermistor 2 error

–

0F

–

Discharge temperature thermistor 3 error

–

10

–

Outdoor temperature thermistor error

–

11

Drain abnormal

Heat exchanger inlet thermistor 1 error

–

12

Room temperature abnormal

Heat exchanger inlet thermistor 2 error

–

13

Indoor unit fan error

Heat exchanger inlet thermistor 3 error

–

14

–

Heat exchanger outlet thermistor 1 error

–

15

–

Heat exchanger outlet thermistor 2 error

–

16

–

Heat exchanger outlet thermistor 3 error

–

17

– Suction thermistor error –

18

Standard wired remote controller communication error 1,2

– –

19

– Discharge pressure sensor error –

1A

– Liquid pressure sensor error –

1B

– Suction pressure sensor error –

1C

– Connection error

1D

– Initial setting error

1E

–

–

–

– Manual storing 2 error

1F

Transmission error Transmission error Transmission error

20

– – –

21

– Discharge temperature 1 error Software error (Output)

22

– Discharge temperature 2 error Software error (Input)

23

– Discharge temperature 3 error –

24

– High-pressure error –

25

– Low-pressure error –

26

–

27

–

28

–

–

–

Pump down error

–

–

–

Error code displayed on central remote controller

EEPROM access error

05-08

If there is a problem with the network convertor(UTR-YSSA), an error code will appear on D129 of print circuit board.

No error (operation mode)

Initial setting

Circuit board error 1

Circuit board error 2

Transmission error with wired RC

Transmission error with indoor unit

Transmission error with VRF system

Software error

Indoor or outdoor unit error

Error code displayed on network convertor

5-4 NETWORK CONVERTOR

Error code

Error contents

05-09

ERROR

ERROR CONTENTS

CAUSE

COUNTERMEASURE

00 No errors
02

1. Error occurrence condition
When power is turned on.
Error for the model informa­ tion, which is memorized
in EEPROM, occurs.

2. Relevant operation

1) Relevant indoor unit is
stopped (Not started).

2) Error is displayed on LED of
indoor unit or output to
communication bus line.

3. Clearance 
Model information, which is
memorized in EEPROM is
recovered normally.

1. Error occurrence condition
Communication between two
microcomputers on indoor
unit control printed circuit
board is not performed
correctly.

2. Relevant operation

1) Relevant indoor unit is
stopped (not started).

2) Error is displayed on LED of
indoor unit or output to
communication bus line.

3. Clearance
The communication between
microcomputers is
performed correctly.

Replace control printed circuit board of
indoor unit.

1. When power is turned off, and then
turned on again:

1) If error doesn't occur, printed circuit
board is normal. Then, remove
noise sources near indoor unit.

2) If error occurs again, remove noise
sources and take measure with the
following countermeasure No.2.

2. Replace indoor unit control printed
circuit board.

Model information is not
memorized or erased because
of some reason.

1. Effect of extraneous noise

2. Control printed circuit board
of Indoor unit is faulty.

Model
information
error

03

Microcomputer
communication
error

1. Error occurrence condition
When control printed circuit
board of Indoor unit detects
frequency, which is not
specified.

2. Relevant operation

1) Relevant indoor unit is
stopped (not started).

2) Error is displayed on LED of
indoor unit or output to
communication bus line.

3. Clearance
Control printed circuit board
of Indoor unit detects the
specified frequency.

Check power supply frequency and
apply the power whose frequency is
within the specified frequency.

Power supply frequency is in
the following range. Lower than
45Hz or Higher than 65Hz.

04

Power supply
frequency
abnormal

1. Error occurrence condition
After indoor unit operation is
started, EEPROM cannot
be accessed because of
disturbance or device error.

2. Relevant operation
Error is displayed on LED
of indoor unit.

3. Clearance
Access to EEPROM is
performed correctly.

1. Remove noise sources near indoor
unit.

2. Replace control printed circuit board
of indoor unit.

EEPROM cannot be accessed
because of disturbance, device
error, etc.

06

EEPROM
access error

INDOOR UNIT TROUBLESHOOTING

ERROR
CODE

5-5 ERROR CODE & TROUBLESHOOTING

5-5-1 TROUBLE SHOOTING WITH ERROR CODE

05-10

ERROR

ERROR CONTENTS

CAUSE

COUNTERMEASURE

07

1. Error occurrence condition
After indoor unit operation is
started, error for model infor­ mation, which is memorized
on EEPROM, occurs.

2. Relevant operation

1) Relevant indoor unit is
stopped.

2) Error is displayed on LED of
indoor unit.

3. Clearance
Model information, which is
memorized on EEPROM
is recovered.

1. Error occurrence condition
The condition of thermistor,
which is short or open, is
detected.

2. Relevant operation
Indoor unit stopped. Error is
displayed on LED of indoor
unit and output to
communication bus line.

3. Clearance
Thermistor detection is
other than short or open.

Replace control printed circuit board
of indoor unit.

1. Check if the connector of Room
temperature thermistor loosens or
comes off.

2. Check the resistance of Room
temperature thermistor. If it's not
normal, replace the thermistor.

Model information is not
memorized, or erased because
of some reasons.

1. Connector connection is
faulty.

2. Room Temperature
thermistor is faulty.

EEPROM
deletion error

09 Room

temperature
thermistor error

1. Error occurrence condition
The condition of thermistor,
which is short or open, is
detected.

2. Relevant operation
Indoor unit is stopped. Error
is displayed on LED of
indoor unit and output to
communication bus line.

3. Clearance
Thermistor detection is
other than short or open.

0A

Heat exchanger
thermistor
(middle) error

1. Check if the connector of Heat
exchanger thermistor (middle)
loosens or comes off.

2. Check the resistance of heat
exchanger thermistor (middle). If it's
not normal, replace thermistor.

1. Connector connection is
faulty.

2. Heat exchanger thermistor
(middle) is faulty.

2. Heat exchanger thermistor
(inlet) is faulty.

1. Error occurrence condition
The condition of thermistor,
which is short or open, is
detected.

2. Relevant operation
Error is displayed on LED
of indoor unit.

3. Clearance
Thermistor detection is
other than short or open.

0B

Heat exchanger
thermistor
(inlet) error

1. Check if the connector of heat
exchanger thermistor (inlet) loosens
or comes off.

1. Connector connection is
faulty.

2. Heat exchanger thermistor
(outlet) is faulty.

0C

Heat exchanger
thermistor
(outlet) error

1. Connector connection is
faulty.

2. Check the resistance of heat
exchanger thermistor (inlet). If it's
not normal, replace thermistor.

1. Error occurrence condition
The condition of thermistor,
which is short or open, is
detected.

2. Relevant operation
Error is displayed on LED
of indoor unit.

3. Clearance
Thermistor detection is
other than short or open.

1. Check if the connector of heat
exchanger thermistor (outlet) loosens
or comes off.

2. Check the resistance of heat
exchanger thermistor (outlet). If it's
not normal, replace thermistor.

ERROR
CODE

05-11

ERROR

CONTENTS

CAUSE

COUNTERMEASURE

0D

1. Error occurrence condition
The condition of thermistor,
which is short or open, is
detected.

2. Relevant operation
Indoor unit is stopped. Error is
displayed on LED of indoor unit
and output to communication
bus line.

3. Clearance
Thermistor detection is other
than short or open.

1. Error occurence condition
Float SW is ON
continuously for 3 minutes.

2. Relevant operation
Indoor unit is stopped. Error
is displayed on LED of
indoor unit and output to
communication bus line.

3. Clearance
Float SW is OFF.

1. Clean drain hose.

2. Clean drain outlet.

3. Check drain pump operation. If it's
faulty, replace pump.

4. If float SW is shorted, replace SW.

1. Drain hose is clogged.

2. Drain outlet is clogged.

3. Drain pump is faulty.

4. Float SW operation is faulty
(short)

Blower
temperature
thermistor
error

11 Drain abnormal

1. Error occurence condition
Room temperature
thermistor detects higher
than 60 C continuously for
30 minutes or longer during
indoor unit operation.

2. Relevant operation
Indoor unit is stopped. Error
is displayed on LED of
indoor unit and output to
communication bus line.

3. Clearance
It's cleared by turning off the
power .

12

Room
temperature
abnormal

1. Error occurr condition
Fan speed feedback of large
ceiling type, slim body cassette
type and ceiling wall type is
lower than 1/3 of target speed.

2. Relevant operation
Indoor fan is stopped, error
is displayed on LED of indoor
unit and out put to communica­ tion bus line.

3. Clearance
It's cleared by turning off the
power.

13

Indoor unit fan
error

1. Check if the connector of blower
temperature thermistor loosens or
comes off.

2. Check resistance of blower
temperature thermistor. If it's not
normal, replace thermistor.

1.Connector connection is
faulty.

2. Blower temperature
thermistor is faulty.

1. Check if the connector of room tempe­ rature thermistor loosens or comes off.

2. Check resistance of room temperature
thermistor. If it's normal, replace
thermistor.

1. Connector connection is
faulty.

2. Room temperature
thermistor is faulty.

1. Check the wiring of indoor fan motor
lead wire .

2. Check if rated power supply voltage
is applied.

1. Indoor fan motor lead wire
connection is faulty.

2. Power supply voltage
abnormal.

1. Error occurrence condition
Communication can not be
performed between standard
wired remote controller and
indoor unit or between indoor
units in same remote controller
group for a certain time.

2. Relevant operation
Error is displayed on LED of
indoor unit.

3. Clearrance
Standard wired remote
controller communication
is recovered.

18

Standard wired
R.C. communi­cation error 1,2

1. Check if communication line is
connected to each indoor unit. Check
if communication line is disconnected
or loosen.

2. Replace control printed circuit board of
indoor unit.

3. Replace standard wired remote
controller printed circuit board.

1. Communication line is not
connected, connection fault,
or disconnection.

2. Indoor unit control printed
circuit board is faulty.

3. Standard wired remote
controller printed circuit
board is faulty.

ERROR
CODE

05-12

ERROR

ERROR CONTENTS

CAUSE

COUNTERMEASURE

1F

1. Error occurrence condition
Communication between
indoor unit and outdoor unit
cannot be performed for a
certain time.

2. Relevant operation
Current operation is
continued.
Error is displayed on
standard wired remote
controller, and displayed on
indoor unit LED.

3. Clearance
Communication between
indoor unit and outdoor unit
is recovered.

1. Error occurrence condition
Indoor unit communication
printed circuit board is not
initialized normally.

2. Relevant operation
Error is displayed on
standard wired remote
controller and displayed on
LED of indoor unit.

3. Clearance
Indoor unit communication
printed circuit board is
initialized correctly.

1. When power turned OFF and turned
ON again:

1) If error doesn't occur, printed circuit
board is normal. Then, remove
noise sources near indoor unit.

2) If error occurs again, remove noise
sources and take measure with the
following countermeasure No.2-3.

2. Replace printed circuit boards with
following procedures,
and check the operation.
1 Replace Indoor unit communication
printed circuit board.
2 Replace Indoor unit control printed
circuit board.

1. Effect of extraneous noise.

2. Printed circuit board is faulty.

Transmission
error

20

Node setting
error

1. When power is turned OFF and
turned ON again:

1) If error doesn't occur, printed circuit
board is normal. Then, remove noise
sources near outdoor unit.

2) If error occurs again, remove noise
sources and take measure with the
following countermeasure No.2-4.

2. Check if communication line is
connected to all indoor unit. Check if
communication line is disconnected.

3. Check the insertion of indoor unit
communication printed circuit board
and outdoor unit communication
printed circuit board.

4. 1) If communication of some indoor
units in same refrigerant system is
abnormal and the compressor
operates, replace printed circuit
boards with following procedures
and check the operation:
1 Replace Indoor unit communication
printed circuit board.
2 Replace Indoor unit control
printed circuit board.

2) If communication of all indoor units
in same refrigerant system is
abnormal and the compressor does
not operate, replace printed circuit
boards with following procedures and
check the operation:
1 Replace Outdoor unit communication
printed circuit board.
2 Replace Outdoor unit control printed
circuit board.
3 Replace Indoor unit communication
printed circuit board.
4 Replace Indoor unit control printed
circuit board.

2. Communication line is not
connected, connection fault,
or disconnection.

3. Insertion for communication
printed circuit board of
indoor unit or outdoor unit
is faulty.

4. Printed circuit board is faulty.

1. Effect of extraneous noise.

ERROR
COCE

05-13

ERROR

ERROR CONTENTS

CAUSE

COUNTERMEASURE

1. Error occurrence condition
Communication between
indoor unit control printed
circuit board and indoor unit
communication printed
circuit board is not
performed normally.

2. Relevant operation

1) Current operation is
continued. Error is displayed
on standard wired remote
controller, and displayed on
LED of indoor unit.

2) If error continues for 90
seconds after it's
occurrence, a new
transmission error
(1F) is output.

3. Clearance
Communication is
performed correctly between
indoorunit control printed
circuit board and indoor unit
communication printed
circuit board.

Error occurs on outdoor unit
in same refrigerant system.

21 Parallel

communication
error

1. When power is turned OFF and turned
ON again:

1) If error doesn't occur, printed circuit
board is normal. Then, remove noise
sources near indoor unit.

2) If error occurs again, remove noise
sources and take measure with the
following countermeasure No.2-3.

2. Check the insertion of indoor unit
communication printed circuit board.

3. Replace printed circuit boards with
following procedure, and check
the operation.
(1) Replace Indoor unit communication
printed circuit board.
(2) Replace Indoor unit control printed
circuit board.

1. Effect of extraneous noise.

32 Outdoor unit

error

See "Outdoor unit troubleshooting".

Outdoor unit is faulty.

2. Indoor unit communication
board insertion is faulty.

3. Printed circuit board is faulty.

ERROR
CODE

05-14

ERROR

ERROR CONTENTS

CAUSE

COUNTERMEASURE

00 No errors

02

1. Error occurrence condition
When power is turned on,
error occurs in model
information, which is
memorized in EEPROM.

2. Relevant operation

1) All compressors are
stopped (not started).

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
Model information, which is
memorized in EEPROM
is recovered.

1. Error occurrence condition
Communication between
two microcomputers on
outdoor unit control printed
circuit board is not
performed normally.

2. Relevant operation

1) All compressors is stopped
(not started).

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
Communication between
microcomputers is
recovered.

Replace outdoor unit control printed
circuit board.

1. When power is turned OFF and turned
ON again:

1) If error doesn't occur, printed circuit
board is normal. Then, remove noise
sources near outdoor unit.

2) If error occurs again, remove noise
sources and take measure with the
following countermeasure No.2.

2. Replace outdoor unit control printed
circuit board.

Model information is not
memorized, or erased because
of some reason.

1. Effect of extraneous noise

2. Outdoor unit control printed
circuit board is faulty.

Model
information
error

03

Circuit board
error

1. Error occurrence condition
Outdoor unit control printed
circuit board detects
frequency outside of rating.

2. Relevant operation

1) All compressors are
stopped (not started).

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
Outdoor unit control printed
circuit board detects the
specified frequency.

Check power supply frequency and
apply the power whose frequency is
within the specified frequency.

04

Power supply
frequency
abnormal

1. Check power supply wiring.

2. Check power supply wiring. If there
are no mistakes, replace outdoor unit
control printed circuit board.

1. Reverse phase wiring.

2. Reverse phase prevention
circuit is faulty.

05

Reverse phase
blocker error

Power supply frequency is in
the following range. Lower than
45Hz or higher than 65Hz.

1. Error occurrence condition
Reverse phase prevention
circuit detects the wrong
phase of power supply or
the correct power supply
input is not detected.

2. Relevant operation

1) All compressors are
stopped.

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
Reverse phase prevention
circuit doesn't detect
reverse phase input.

OUTDOOR UNIT TROUBLESHOOTING

ERROR
CODE

05-15

ERROR

ERROR CONTENTS

CAUSE

COUNTERMEASURE

06

1. Error occurrence condition
After outdoor unit operation
is started, EEPROM cannot
be accessed because of
disturbance or device error.

2. Relevant operation
Error is displayed on LED of
outdoor unit. *Outdoor unit
operation is not controlled.

3. Clearance
EEPROM can be accessed
correctly.

1. Remove noise sources near outdoor
unit.

2. Replace outdoor unit control printed
circuit board.

EEPROM cannot be accessed
because of disturbance, device
error, etc.

Replace outdoor unit control printed
circuit board.

Model information is not
memorized, or erased for some
reason.

EEPROM
access error

07 EEPROM

deletion error

09 Compressor 1

error

1. Check if the wiring of discharge
temperature sensor THD1 loosens or
comes off. And check the resistance
of sensor. If it's abnormal,
replace sensor.

2. Check compressor power relay 1. If
it's abnormal, replace power relay.

3. Check CN24 (compressor 1) 12V
voltage output on outdoor unit control
printed circuit board. If it's abnormal,
replace printed circuit board.

4. Check magnetic contactor 1. If it's
abnormal, replace contactor.

5. Check additional refrigerant amount
and recharge suitable refrigerant.

6. Temporary data transmission trouble
due to Effect of extraneous noise, etc.
Operation is not affected.

7. Compressor overload operation
Check "High-pressure error". Motor
protector is reset at 61 C +/-9 C.

8. Check compressor. If it's faulty,
replace compressor.

1. Discharge temperature
sensor THD1 is faulty.

3. Outdoor unit control printed
circuit board is faulty.

4. Magnetic contactor 1
is faulty.

5. Lack of refrigerant.

6. After 2 and half an hours
have elapsed since error is
displayed, error detection
is performed again and error
is not displayed.

7. Compressor motor protector
is operated.

8. Compressor is faulty.

1. Error occurrence condition
After outdoor unit operation
is started, error occurs in
model information, which is
memorized in EEPROM.

2. Relevant operation

1) All compressors are stopped.

2) Error is displayed on LED of
outdoor unit.

3. Clearance
Model information, which is
memorized in EEPROM is
recovered.

1. Error occurrence condition
After thirty minutes has
elapsed since compressor 1
starts to work, discharge
temperature 1 does not
reach to outdoor
temperature plus 10 C.

2. Relevant operation

1) After compressor error
occurs, compressor
recovery operation is
performed. However, if
defrosting control or oil
recovery operation is
performed, compressor
recovery is not operated.

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
When 2 hours have elapsed
after error occurrence.
*Counting of 2-hour counter
starts if error occurs on any
compressors.
Error is cleared by turning
power off.

2. Compressor power relay 1
is faulty.

ERROR
CODE

05-16

ERROR

CONTENTS

CAUSE

COUNTERMEASURE

Compressor 2
error

1. Check if the wiring of discharge
temperature sensor THD2 loosens or
comes off. And check the resistance of
sensor. If it's abnormal, replace sensor.

2. Check compressor power relay 2. If
it's abnormal, replace power relay.

3. Check CN25 (compressor 2) 12V
voltage output on outdoor unit control
printed circuit board. If it's abnormal,
replace printed circuit board.

4. Check magnetic contactor 2. If it's
abnormal, replace contactor.

5. Check additional refrigerant amount
and recharge suitable refrigerant.

6. Temporary data transmission trouble
due to affect of noise, etc. Operation is
not affected.

7. Compressor overload operation
Check "High-pressure error". Motor
protector is reset at 61 C +/-9 C.

8. Check compressor. If it's faulty,
replace compressor.

1. Discharge temperature
sensor THD2 is faulty.

3. Outdoor unit control printed
circuit board is faulty.

4. Magnetic contactor 2 is
faulty.

5. Lack of refrigerant.

6. After 2 and half an hours
have elapsed since error is
displayed, error detection
is performed again and error
is not displayed.

7. Compressor motor protector
is operated.

8. Compressor is faulty.

1. Error occurrence condition
After thirty minutes have
elapsed since compressor 2
starts to work, discharge
temperature 2 does not
reach to outdoor
temperature plus 10 C.

2. Relevant operation

1) After compressor error
occurs, compressor
recovery operation is
performed. However, if
defrosting control or oil
recovery operation is
performed, compressor
recovery is not operated.

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
When 2 hours have elapsed
after error occurrence.
*Counting of 2-hour counter
starts if error occurs on any
compressors. Error is
cleared by turning power off.

2. Compressor power relay 2
is faulty.

0A

Compressor 3
error

1. Check if the wiring of discharge
temperature sensor THD3 loosens or
comes off. And check the resistance
of sensor. If it's abnormal, replace
sensor.

2. Check compressor power relay 3. If
it's abnormal, replace power relay.

3. Check CN26 (compressor 3) 12V
voltage output on outdoor unit control
printed circuit board. If it's abnormal,
replace printed circuit board.

4. Check magnetic contactor 3. If it's
abnormal, replace contactor.

5. Check additional refrigerant amount
and recharge suitable refrigerant.

6. Temporary data transmission trouble
due to affect of noise, etc. Operation
is not affected.

7. Compressor overload operation
Check "High-pressure error". Motor
protector is reset at 61 C +/-9 C.

8. Check compressor. If it's faulty,
replace compressor.

1. Discharge temperature
sensor THD3 is faulty.

3. Outdoor unit control printed
circuit board is faulty.

4. Magnetic contactor 3 is
faulty.

5. Lack of refrigerant.

6. After 2 and half an hours
have elapsed since error is
displayed, error detection
is performed again and error
is not displayed.

7. Compressor motor protector
is operated.

8. Compressor is faulty.

1. Error occurrence condition
After thirty minutes have
elapsed since compressor 3
starts to work, discharge
temperature 3 does not
reach to outdoor
temperature plus 10 C.

2. Relevant operation

1) After compressor error
occurs, compressor
recovery operation is
performed. However, if
defrosting control or oil
recovery operation is
performed, compressor
recovery is not operated.

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
When 2 hours has elapsed
after error occurrence.
*Counting of 2-hour counter
starts if error occurs on any
compressors.
Error is cleared by turning
power off.

2. Compressor power relay 3 is
faulty.

0B

ERROR
CODE

05-17

ERROR

CONTENTS

CAUSE

COUNTERMEASURE

Discharge
temperature
thermistor 1
error

1. Check if the connector of discharge
temperature thermistor THD1 loosens

or comes off.

2. Check the resistance of discharge
temperature thermistor THD1. If it's

abnormal, replace thermistor.

1. Connector contact is faulty.

1. Error occurrence condition
Thermistor condition, which
is short or open, is detected.

2. Relevant operation

1) Compressor 1 is stopped.

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
Thermistor detection is
other than short or open.
*Detection is performed when
Compressor continues to
operate for 5 minutes or
longer.

2. Discharge temperature
thermistor THD1 is faulty.

0D

Discharge
temperature
thermistor 2
error

1. Check if the connector of discharge
temperature thermistor THD2 loosens
or comes off.

2. Check the resistance of discharge
temperature thermistor THD2. If it's

abnormal, replace thermistor.

1. Connector contact is faulty.

1. Error occurrence condition
Thermistor condition, which
is short or open, is detected.

2. Relevant operation

1) Compressor 2 is stopped.

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
Thermistor detection is
other than short or open.
*Detection is performed when
Compressor continues to
operate for 5 minutes or
longer.

2. Discharge temperature
thermistor THD2 is faulty.

0E

Discharge
temperature
thermistor 3
error

1. Check if the connector of discharge
temperature thermistor THD3 loosens
or comes off.

2. Check the resistance of discharge
temperature thermistor THD1. If it's

abnormal, replace thermistor.

1. Connector contact is faulty.

1. Error occurrence condition
Thermistor condition, which
is short or open, is detected.

2. Relevant operation

1) Compressor 3 is stopped.

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
Thermistor detection is
other than short or open.
*Detection is performed when
Compressor continues to
operate for 5 minutes or
longer.

2. Discharge temperature
thermistor THD3 is faulty.

0F

ERROR
CODE

05-18

ERROR

CONTENTS

CAUSE

COUNTERMEASURE

Outdoor
thermistor error

1. Check if the connector of outdoor
temperature thermistor THH0 loosens

or comes off.

2. Check the resistance of outdoor

temperature thermistor THH0. If it's
abnormal, replace thermistor.

1. Connector contact is faulty.

2. Outdoor temperature
thermistor THH0 is faulty.

10

Suction
thermistor error

11 Heat exchanger

inlet
thermistor 1
error

1. Check if the connector of heat
exchanger inlet thermistor THHI1
loosens or comes off.

2. Check the resistance of heat
exchanger inlet thermistor THHI1. If it's

abnormal, replace thermistor.

1. Connector contact is faulty.

2. Heat exchanger inlet
thermistor THHI1 is faulty.

Heat exchanger
inlet
thermistor 2
error

1. Connector contact is faulty.

2. Heat exchanger inlet
thermistor THHI2 is faulty.

Heat exchanger
inlet
thermistor 3
error

1. Connector contact is faulty.

2. Heat exchanger inlet
thermistor THHI3 is faulty.

Heat exchanger
outlet
thermistor 1
error

1. Error occurrence condition
Each thermistor condition,
which is short or open,
is detected.

2. Relevant operation

1) All Compressors are
stopped.
*For suction temperature
thermistor error,
compressors are not stopped.

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.
*For suction temperature
thermistor error, error is only
displayed on LED of outdoor
unit.

3. Clearance
Thermistor detection is
other than short or open.

1. Connector contact is faulty.

2. Heat exchanger outlet
thermistor THHO1 is faulty.

1. Connector contact is faulty.

2. Heat exchanger outlet
thermistor THHO2 is faulty.

1. Connector contact is faulty.

2. Heat exchanger outlet
thermistor THHO3 is faulty.

1. Connector contact is faulty.

2. Suction temperature
thermistor THS is faulty.

12

13

14

15

16

17

Heat exchanger
outlet
thermistor 2
error

Heat exchanger
outlet
thermistor 3
error

1. Check if the connector of heat
exchanger inlet thermistor THHI2
loosens or comes off.

2. Check the resistance of heat
exchanger inlet thermistor THHI2. If it's

abnormal, replace thermistor.

2. Check the resistance of heat
exchanger inlet thermistor THHI3. If it's

abnormal, replace thermistor.

1. Check if the connector of heat
exchanger thermistor THHI3
loosens or comes off.

1. Check if the connector of heat
exchanger outlet thermistor THHO1
loosens or comes off.

2. Check the resistance of heat
exchanger thermistor THHO1. If it's

abnormal, replace thermistor.

1. Check if the connector of heat
exchanger outlet thermistor THHO2
loosens or comes off.

2. Check the resistance of heat
exchanger outlet thermistor THHO2.

If it's abnormal, replace thermistor.

1. Check if the connector of heat
exchanger outlet thermistor THHO3
loosens or comes off.

2. Check the resistance of heat
exchanger outlet thermistor THHO3.

If it's abnormal, replace thermistor.

1. Check if the connector of suction
temperature thermistor THS
loosens or comes off.

2. Check the resistance of suction
temperature thermistor THS.

If it's abnormal, replace thermistor.

ERROR
CODE

05-19

ERROR

CONTENTS

ERROR CAUSE

COUNTERMEASURE

Discharge
pressure sensor
error

Replace discharge pressure sensor PH.

Discharge pressure sensor PH
is faulty.

1. Error occurrence condition

1) Voltage output from output
remains under 0.8V for 3
minutes or longer. However,
detection isn't performed for
3 minutes after power is
applied to outdoor unit.

2) Output sensor detection
value is 3.46MPa or higher.

2. Relevant operation

1) All compressors are stopped.

2) Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
Output voltage from pressure
sensor returns within 1- 5V.

19

Liquid pressure
sensor error

Replace liquid line pressure sensor PM.

Liquid line pressure sensor PM
is faulty.

1A

ERROR
CODE

05-20

ERROR

CONTENTS

ERROR CAUSE

COUNTERMEASURE

Transmission
error

1F

2. Check if communication line is
connected to all indoor units.
Check if communication line is
disconnected.

3. Check indoor units power supply.

4. Check the insertion of indoor unit
communication PC board and outdoor
unit communication PC board.

5. 1) If transmission error occurs after
Parallel communication error
replace PC boards with following
procedures and check the operation.
(1) Replace outdoor unit communication
printed circuit board.
(2) Replace outdoor unit control printed
circuit board.

2) when some indoor units in same
refrigerant system are operated,
replace printed circuit boards with
following procedures and make sure
the operation.
(1) Replace communication printed
circuit board of indoor unit that occurs
transmission error
(2) Replace control printed circuit board
of indoor unit that occurs transmission
error.

3) When an error occurs on all indoor
units of the same refrigerant system
and compressor does not operate,
replace PC boards with following
procedures and make sure the
operation.
(1) Replace outdoor unit communication
PC board.
(2) Replace outdoor unit control PC
board.
(3) Replace indoor unit communication
PC board.
(4) Replace indoor unit control PC board.

5. PC board is faulty.

1. Error occurrence condition
Communication from each
indoor units are cut off for a
certain time.

2. Relevant operation

1) If transmission error occurs
after 90 seconds since
Outdoor unit circuit board
error 1 occurs, all
compressors are stopped
and error is displayed on
LED of outdoor unit.

2) If communication from all
indoor units are cuts of for a
certain time, all
compressors are stopped
and error is displayed on
LED of outdoor unit.

3) Except a forementioned
operations, only indoor units
that completes the
commnunications are
operated. Error is displayed
on LED of outdoor unit.

3. Clearance

1) Communication with indoor
units is recovered.

2) Main power is reset.

1. Effect of extraneous noise

2. Communication line is not
connected, contact is faulty,
or disconnection.

3. Indoor unit power is OFF

4. Insertion fault for
communication printed circuit
board of indoor unit or
outdoor unit.

1. When power is turned off, and turned
on again:
(1) If error doesn't occur, printed circuit
board is normal. Then, remove noise
sources near outdoor unit.
(2) If error occurs again, remove noise
sources and take measures with the
following countermeasure No.2 to 5.

ERROR
CODE

05-21

ERROR

CONTENTS

ERROR CAUSE

COUNTERMEASURE

Discharge
temperature 1
error

1. Check the gas leak and additional
refrigerant amount, and recharge
suitable refrigerant.

1. Gas leak or lack of refrigerant.

1. Error occurrence condition
Discharge temperature 1
rises to 130 C or higher for
40 minutes and compressor
1 is stopped twice or more.

2. Relevant operation
Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
When all the following
conditions are satisfied:

1) Discharge temperature
protector 1 reset.

2) Discharge temperature
protector is not operated for
40 minutes or longer.

21

2. Check outdoor fan motor operation.
Remove the obstruction in wind path.
If fan motor is faulty, replace motor.

3. Check if the wiring of discharge
temperature sensor THD1 loosens or
comes off and check the resistance
THD1. If it's abnormal, replace sensor.

4. Check operation and coil resistance
of following electronic expansion
valve. If it's abnormal, replace
electronic expansion valve.
Coil resistance measurement points.
Red-white, red-orange, brown-yellow,
brown-blue.
(1) Outdoor unit electronic expansion
valve EEV1 and EEV2 Coil
resistance: 192 +/-19 ohms.
(2) Indoor units electronic expansion
valve EEV Coil resistance:
150 +/-50 ohms.

5. Check operation of following solenoid
valves. If operation is faulty, replace
solenoid valve.
Cooling operation.
(1) Outdoor unit solenoid valve SV1.
(2) RB unit solenoid valves SVB and
SVS.
Heating operation.
(3) Outdoor units solenoid valves SV1,
SV7, and SV8.
(4) RB unit solenoid valve SVD.
Heat recovery operation (1), (2),
(3), (4).

2. Outdoor fan motor is faulty.

3. Discharge temperature
sensor THD1 is faulty.

4. Electronic expansion valve
operation is faulty.

5. Solenoid valve operation is
faulty.

ERROR
CODE

05-22

ERROR

CONTENTS

ERROR CAUSE

COUNTERMEASURE

Discharge
temperature 2
error

1. Check the gas leak and check
additional refrigerant amount and
recharge suitable refrigerant.

1. Gas leak or lack of refrigerant.

1. Error occurrence condition
Discharge temperature 2
rises to 130 C or higher for
40 minutes and compressor
2 is stopped twice or more.

2. Relevant operation
Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
When all the following
conditions are satisfied:

1) Discharge temperature
protector 2 is reset.

2) Discharge temperature
protector is not operated for
40 minutes or longer.

22

2. Check outdoor fan motor operation.
Remove the obstruction in wind path.
If fan motor is faulty, replace motor.

3. Check if the wiring of discharge
temperature sensor THD2 loosens or
comes off and check the resistance of
THD2. If it's abnormal, replace sensor.

4. Check operation and coil resistance of
following electronic expansion valve. If
it's abnormal, replace electronic
expansion valve.
Coil resistance measurement points.
Red-white, red-orange, brown-yellow,
brown-blue.
(1) Outdoor unit electronic expansion
valve EEV1 and EEV2 Coil
resistance: 192 +/-19 ohms.
(2) Indoor units electronic expansion
valve EEV Coil resistance:
150 +/-50 ohms.

5. Check operation of following solenoid
valves. If operation is faulty, replace
solenoid valve.
Cooling operation
(1) Outdoor unit solenoid valve SV1.
(2) RB unit solenoid valves SVS
Heating operation
(3) Outdoor units solenoid valves SV1,
SV7, and SV8.
(4) RB unit solenoid valve SVD
Heat recovery operation (1), (2),
(3), (4)

2. Outdoor fan motor is faulty.

3. Discharge temperature
sensor THD2 is faulty.

4. Electronic expansion valve
operation is faulty.

5. Solenoid valve operation
is faulty.

ERROR
CODE

05-23

ERROR

CONTENTS

ERROR CAUSE

COUNTERMEASURE

Discharge
temperature 3
error

1. Check the gas leak and check
additional refrigerant amount and
recharge suitable refrigerant.

1. Gas leak or lack of refrigerant.

1. Error occurrence condition
Discharge temperature 3
rises 130 C or greater for
40 minutes and compressor
3 is stopped twice or more.

2. Relevant operation
Error is displayed on LED of
outdoor unit and output to
communication bus line.

3. Clearance
When all the following
conditions are satisfied:

1) Discharge temperature
protector 3 is reset.

2) Discharge temperature
protector is not operated for
40 minutes or longer.

23

2. Check outdoor fan motor operation.
Remove the obstruction in wind path.
If fan motor is faulty, replace motor.

3. Check if the wiring of discharge
temperature sensor THD3 loosens or
comes off and check the resistance of
THD3. If it's abnormal, replace sensor.

4. Check operation and coil resistance of
following electronic expansion valve.
If it's abnormal, replace electronic
expansion valve.
Coil resistance measurement points.
Red-white, red-orange, brown-yellow,
brown-blue.
(1) Outdoor unit electronic expansion
valve EEV1 and EEV2 Coil
resistance: 192 +/-19 ohms.
(2) Indoor units electronic expansion
valve EEV Coil resistance:
150 +/-50 ohms.

5. Check operation of following solenoid
valves. If operation faulty, replace
solenoid valve.
Cooling operation
(1) Outdoor unit solenoid valve SV1
(2) RB unit solenoid valves SVS
Heating operation
(3) Outdoor units solenoid valves SV1,
SV7, and SV8
(4) RB unit solenoid valve SVD
Heat recovery operation (1), (2),
(3), (4)

2. Outdoor fan motor is faulty.

3. Discharge temperature
sensor THD3 is faulty.

4. Electronic expansion valve
operation is faulty.

5. Solenoid valve operation is
faulty.

ERROR
CODE

05-24