Fujitsu UTF-Y90A4A Service Manual

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Page 1

Multi Air Conditioning System for Buildings

VRF (FREELY SELECTABLE MULTI TYPE SYSTEM)

SERVICE MANUAL

CONFIDENTIAL

Page 2

Multi Air Conditioning System

for Buildings

VRF (FREELY SELECTABLE MULTI TYPE SYSTEM)

SERVICE MANUAL

– 2 –

Page 3

CONTENTS

1. OUTLINE OF SYSTEM

1-1

MODEL CONSTRUCTION

1-2

SYSTEM CONSTRUCTION CONDITIONS

1-2-1 1-2-2

1-3

(1) (2)

REFRIGERANT PIPING

SYSTEM WIRING ADDRESS SETTING KINDS OF ADDRESS AND SETTING RANGE EXAMPLES OF SYSTEM SETTING

................................................................................................

2. TEST RUN ADJUSTMENT

CHECK ITEMS BEFORE TEST RUN

2-1 2-2

2-2-2

OUTDOOR PC BOARD2-2-1

TEST OPERATION USING REMOTE CONTROLLER TEST RUN CONTROL2-3

................................................................................................TEST RUN METHOD

3. REFRIGERANT PIPE SYSTEM DIAGRAM

COOLING ONLY / HEAT PUMP TYPE3-1

3-2

4. FUNCTION OF PRINTED CIRCUIT BOARD

PCB LAYOUTS4-1 MICROPROCESSOR BLOCK DIAGRAM4-2 MICROPROCESSOR FUNCTION LIST4-3 FUNCTION AND SETTING OF EACH SWITCH4-4 INDOOR UNIT OUTDOOR UNIT REMOTE CONTROLLER

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5. OUTDOOR UNIT OPERATION CONTROL

5-1

COMPRESSOR OPERATION CONTROL 5-1-1 5-1-2 5-1-3

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

OPERATION STOP CONDITION COMPRESSOR OUTPUT PATTERN 3 MINUTES RESTART PREVENTION ( 3 MIN ST )

HEAT EXCHANGER CAPACITY CONTROL

OUTDOOR FAN MOTOR CONTROL

EXPANSION VALVE 1/2 CONTROL

FOUR-WAY VALVE 1 CONTROL

CIRCULATING SAVE AMOUNT CONTROL

SOLENOID VALVE 2 CONTROL

FOUR-WAY VALVE 5 CONTROL

DEFROSTING CONTROL

OIL RETURN CONTROL OIL RECOVERY CONTROL PROTECTION FUNCTION PUMP DOWN CONTROL

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.........................................................................................HEAT RECOVERY TYPE

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– 3 –

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.......................................................5-1-4 COMPRESSOR RECOVERY OPERATION

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12 13 13 15

19 20 20 20 22

23 24

25 26 28 30 30 34

43 43 43 43 44 45 46 48 49 5 51 52 53 54 55 56 57

5 7 7

Page 4

6. INDOOR UNIT OPERATION

6-1 TIMER CONTROL 6-2 FAN CONTROL

6-2-1

6-3

6-3-3 6-3-4 6-3-5

6-5 6-6 6-7

"AUTO" POSITION .............................................................................................

"LOW" "MED" AND "HIGH" POSITION6-2-2

MASTER CONTROL

OPERATION MODE CONTROL ...........................................................................

"COOL" POSITION "HEAT" POSITION

"FAN" POSITION LOUVER CONTROL6-4 ELECTRONIC EXPANSION VALVE CONTROL AUTO RESTART DRAIN PUMP OPERATION

..................................................................................................... 59

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..............................................................................................."AUTO" POSITION6-3-2

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7. WIRING DIAGRAM

INDOOR UNIT OUTDOOR UNIT

............................................................................................................

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8. TROUBLESHOOTING

8-1

INDOOR UNIT 8-1-1 8-1-2

8-2-1 NORMAL OPERATING DISPLAY

8-4

8-5-1 CHARACTERISTICS OF THERMISTOR

8-5-3 ELECTRIC EXPANSION VALVE

NORMAL OPERATION DISPLAY ABNORMAL OPERATION DISPLAY

OUTDOOR UNIT8-2

ABNORMAL OPERATION DISPLAY8-2-2 REMOTE CONTROL UNIT8-3 ERROR CODE & TROUBLESHOOTING

INDOOR UNIT TROUBLESHOOTING 91...................................................................

OUTDOOR UNIT TROUBLESHOOTING 96................................................................

CENTRAL REMOTE CONTROLLER TROUBLESHOOTING .................................

OTHERS8-5

PRESSURE SENSOR8-5-2

RB UNIT (HEAT RECOVERY TYPE ONLY)8-5-4

OTHERS8-5-5

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.......................................................TROUBLESHOOTING (NO ERROR CODE)8-4-1

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64 64 64 65 656-3-1 65 69 69 70 71

74......................................................

74 74

75 83

84 84 85 88 88 89 90 91

091 141 24 241 261 261 261 261

9. IN USE OF THE NEW REFRIGERANT R407C

10. DISASSEMBLY ILLUSTRATION

11. PARTS LIST

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– 4 –

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291 341 731

Page 5

1. OUTLINE OF SYSTEM

1-1 MODEL CONSTRUCTION

■ OUTDOOR UNITS

TYPE

COOLING ONLY HEAT PUMP HEAT RECOVERY

POWER SOURCE

3 PHASE 4 LINE

380 415V 50Hz 380 415V 50Hz

380 415V 50Hz

CAPACITY RANGE

28.0 kW

Compact size

1,380

1,300

Serial installation possible

650

■ INDOOR UNITS

10 types, 39 models ranging from 2.15kW to

17.0kW.

Type

Capacity

kw Model code

14.1

(17.0)

12.7

10.5

8.8

6.8

(7.05)

5.3

(5.7)

4.05

3.6

2.8

2.15

(60)

45 36 30

(25)

(20)

14 12

Ceiling/ Floor

9 7

Ceiling

(High Static

Pressure)

Cassette

(compact)

: 2002

CassetteDuctDuctDuct Duct

Wall

mounted

Wall

mounted

– 5 –

Page 6

UTR-BP54A Less than 60 UTR-BP90A More than 61 or more UTR-BP54R Less than 60 UTR-BP90R More than 61 or more

Model Max. connectable indoor units UTF-Y90A4A 4 UTF-Y54A1A 1

Type Model Total model code of connectable indoor unit

Heat pump

Heat recovery

UTR-HD906A 3 6 UTR-HD908A 7 8 UTR-HD906R 3 6 UTR-HD908R 7 8

Type Model

Connectable indoor units Cooling only Heat pump

Heat recovery

RB (REFRIGERANT BRANCH) UNIT

SEPARATION TUBE

Above units are required during heat recovery operation.

HEADER

Cooling only

– 6 –

Page 7

■

1-2 SYSTEM CONSTRUCTION CONDITIONS

1-2-1 REFRIGERANT PIPING

COOLING ONLY / HEAT PUMP MODEL

a+e 100m (actual pipe length) Difference in height between outdoor unit and indoor units (H1) maximum 50m.

(For the outdoor unit stated below:maximum 40m)

Difference in height between adjacent indoor units (H2) maximum 15m.

e 40m (actual pipe length)

a 70m (actual pipe length)

a+b+c+d+e 200m (total pipe length)

Outdoor

unit

Indoor

unit

Indoor

unit

Indoor

unit

dcb

Indoor

unit

a+b+c+d+e+f 100m (actual pipe length) Difference in height between outdoor unit and indoor units (H1) maximum 50m.

Difference in height between adjacent indoor units (H2) maximum 15m. From outdoor unit to first separation tube a 70m (actual pipe length) b+c+d+e+f 40m (actual pipe length)

a+b+c+d+e+f+g+h+i+j+k 200m (total pipe length)

Outdoor

unit

bcde

g h i j k

Indoor

unit

Indoor

unit

Indoor

unit

Indoor

unit

Indoor

unit

Indoor

unit

a+g+i 100m a+b+f 100m (actual pipe length) Difference in height between outdoor unit and indoor units (H1) maximum 50m.

Difference in height between adjacent indoor units (H2) maximum 15m.

a 70m (actual pipe length)

g+i 40m b+f 40m (actual pipe length) a+b+c+d+e+f+g+h+i 200m (total pipe length)

Outdoor

unit

Indoor

unit

– 7 –

Indoor

unit

Indoor

unit

edc

Indoor

unit

Indoor

unit

Indoor

unit

Page 8

PIPE SIZE

COOLING ONLY / HEAT PUMP MODEL

Pipe size connected to outdoor unit.

Model Gas Pipe Liquid Pipe

AO 90 28.58 12.7

Between two adjacent refrigerant branch kits.

(unit : mm)

Total model code of

Gas Pipe Liquid Pipe Separation Kit

indoor unit

Less than 30 15.88 9.53

UTR-BP54A

31 or more to 60 19.05 9.53

61 or more 28.58 12.7 UTR-BP90A

Connection pipe size of indoor unit.

(unit : mm)

Model code of indoor unit Gas Pipe Liquid Pipe

7, 9 9.53 6.35 12, 14

( )

12.7 6.35

18, 20, 24, 25 15.88 6.35

15.88

9.53

36, 45, 54, 60 19.05 9.53

Cassette(compact) only

– 8 –

Page 9

■

HEAT RECOVERY MODEL

a+e 100m (actual pipe length) Difference in height between outdoor unit and indoor units (H1) maximum 50m.

(For the outdoor unit stated below : maximum 40m)

Difference in height between adjacent indoor units (H2) maximum 15m. Difference in height between RB unit and RB unit (H3) 15m or less.

Difference in height between

RB unit and indoor unit (H4) 5m or less

40m (actual pipe length)

10m (actual pipe length)

a+b+c+d+e 200m (total pipe length)

Outdoor

unit

a+b+c+d+e+f 100m (actual pipe length)

unit

Indoor

unit

Indoor

unit

RB unit

Indoor

unit

RB unit

Indoor

unit

Difference in height between outdoor unit and indoor units (H1) maximum 50m. Difference in height between adjacent indoor units (H2) maximum 15m. Difference in height between RB unit and indoor unit (H3) 5m or less.

From outdoor unit to first separation tube a 70m (actual pipe length)

b+c+d+e+f 40m (actual pipe length)

10m (actual pipe length)

a+b+c+d+e+f+g+h+i+j+k 200m (total pipe length)

Outdoor

unit

bcde

g h i j k

unit

Indoor

unit

Indoor

unit

RB unit

Indoor

unit

Indoor

unit

RB unit

Indoor

unit

Indoor

a+g+i 100m a+b+f 100m (actual pipe length) Difference in height between outdoor unit and indoor units (H1) maximum 50m. Difference in height between adjacent indoor units (H2) maximum 15m. Difference in height between RB unit and RB unit (H3) 15m or less. Difference in height between RB unit and indoor unit (H4) 5m or less. g+i 40m b+f 40m (actual pipe length)

j 10m (actual pipe length)

a+b+c+d+e+f+g+h+i 200m (total pipe length)

Outdoor

unit

RB unit

4 brunch

RB unit

unit

H4, f

edc

unit

Indoor

unit

Indoor

unit

Indoor

unit

Indoor

unit

Indoor

unit

– 9 –

RB unit

Indoor

unit

Page 10

HEAT RECOVERY MODEL

Pipe size connected to outdoor unit.

(unit : mm)

Model Suction Gas Pipe

Discharge Gas Pipe

Liquid Pipe

AO 90 28.58 19.05 12.7

Between two adjacent refrigerant branch kits.

Total model code of Suction Discharge

Liquid Pipe

Separation Kit

indoor unit Gas Pipe Gas Pipe Less than 30 15.88 12.7 9.53

UTR-BP54R

31 or more to 60 19.05 15.88 9.53

61 or more 28.58 19.05 12.7 UTR-BP90R

Connection pipe size of indoor unit.

(unit : mm)

Model code of indoor unit

Gas Pipe Liquid Pipe 7, 9 9.53 6.35 12, 14 12.7 6.35 18, 20, 24, 25 15.88 6.35

15.88

9.53

36, 45, 54, 60 19.05 9.53

– 10 –

Page 11

ADDITIONAL CHARGE

Up to a pipe length of 7.5 m, charging with additional refrigerant is not necessary. If the pipe length exceeds 7.5 m, charging with refrigerant is necessary. Charge with additional refrigerant in the amounts shown in the table below.

(1) Pipe length

Liquid pipe (mm) 12.7 9.53 6.35 Additional refrigerant

0.1 0.05 0.03

(R407C) (kg/m)

(2) System type

It is necessary to add refrigerant to all connected Indoor unit.

Add refrigerant to the corresponding type as shown in the Table for every connected Indoor unit to the

refrigerant system.

Example : When AR30 x2 and AU18 x2 are connected to the refrigerant system.

" Additional charge of system type" is 1.0(kg)x2 +0.65(kg)x2=3.3(kg)

Model / Model code

AS AU AB

0.65

0.4

7 9

0.65120.65

0.4

0.65

0.45

0.9

0.65

0.45

0.65

0.7

ADDITIONAL CHARGE = (1) + (2)

0.9

0.8

24/25

0.9

0.8

1.0

1.5

1.0

2.0

amount of refrigerant (kg)

1.0

2.0

1.5

1.0

2.0

– 11 –

Page 12

1-2-2 SYSTEM WIRING

Use

Outdoor

unit Indoor

Power supply cable (mm )

unit

Transmission cable (mm )

Wired remote control cable (mm )

1,2

4 10m cable attached.

The grounding wire is not included in this cable. Always ground the unit.

Do not bundle the transmission cable with other wires. Transmission cable between each unit : 200m max Each unit means indoor unit,outdoor unit,central remote controller, and signal amplifier.

Total wiring length:maximum 2000m. However,when wiring exceeds 500m in length, a signal amplifier (option) is required.

Use the shielded wire specified and always ground(however,one side only). If not,transmit-receive with a transmission line is not only impossible normally,but malfunction may occur.

Use the shielded cable in accordance with standards in the country.

Wiring length of a remote controller group shall be within 500m.

Size

Maximum H07RN-F or

Minimum equivalent

Maximum H07RN-F or

Minimum equivalent

Maximum

8.0

6.0

2.5

1.5

1.25

Wire type Remarks

Shield cord

(LONWORKS

Minimum

Maximum Sheathed vinyl

Minimum cord cable

0.75

1.25

0.75

compatible part)

3 4 wire 50Hz

380-415V

1 2 wire 50Hz

220-240V

Non-polar

2-core

Polar 3-core

Fuse capacity

per one outdoor unit

per one refrigerant system.

Model Field fuse

Outdoor unit

Indoor unit

40A

20A

– 12 –

Leakage breaker

40A 100mA 0.1sec or less

20A 40mA 0.1sec or less

Page 13

1-3 ADDRESS SETTING

This system is needed to set the address for the indoor unit, outdoor unit and remote controller and central remote controller.

(1) KINDS OF ADDRESS AND SETTING RANGE

UNIT SETTING

Outdoor unit

Refrigerant circuit address

Indoor unit

Indoor unit address

Remote controller address

SETTING

RANGE

0 99

0 15

TYPE OF SWITCH REMARKS

Setting example

Setting example 2

Setting example

SW 9 SW 8

SW 8 SW 7

Show next page

SW 5

Remote controller switch 1

Remote controller

Number of indoor unit connection

Remote controller switch 2

Central

remote

Central remote controller address

controller

INDOOR UNIT CONTROL METHOD

DSW1-4

OFF

METHOD

Master Slave

Allocate remote by order from the

ON/OFF

ON/OFF combination

0 15

REMARKS

control addresses

master unit

SW 9

DIP SW1-1

DIP SW1-2

DIP SW1-4

Initial setting

Terminator

Number of indoor unit

OFFON: 1 unit

: multiple unit

Shown below

– 13 –

Page 14

Refrigerant circuit address conversion table

Outdoor unit

Rotary switch (SW 8)- - - Factory setting "0"

Rotary switch (SW 9)- - - Factory setting "0"

Indoor Unit

Rotary switch (SW 7)- - - Factory setting "0" Rotary switch (SW 8)- - - Factory setting "0"

In case of multiple refrigerant system,set SW 8 and SW 9 Indoor unit SW7 and SW8 as shown in the table for each refrigerant system.

Do not use a nonexistent switch setting combination.

Example : When SW 9 is set to "1" and SW 8 is set to "14" the refrigerant circuit address will be "30".

Refrigerant

circuit

address

0 1 2 3

4 5 6 7 8

9 10 11

13 14 15

16 17

Rotary

Switch setting

OUTDOOR UNIT

SW9

Refrigerant

circuit

address

SW8

INDOOR UNIT

SW7

SW8

0 1

0 0

4 5

0 0

20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

37 38 39

Rotary Switch setting OUTDOOR UNIT

SW9

Refrigerant

circuit

address

SW8 INDOOR UNIT SW8

SW7

1 1

7 8

1 1

2 2

42 43 44

47 48 49 50 51 52 53 54 55 56 57 58 59

Rotary Switch setting OUTDOOR UNIT

SW9

Refrigerant

circuit

address

SW8

INDOOR UNIT SW8

SW7

0 1

3 3

4 5

3 3

60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

Rotary

Switch setting OUTDOOR UNIT

SW9

Refrigerant

circuit

address

SW8

INDOOR UNIT

SW7

SW8

90 91 92 93 94 95 96 97 98

80 81 82 83 84 85 86 87 88 89

Rotary Switch setting OUTDOOR UNIT

SW9

SW8

INDOOR UNIT

SW7

SW8

5 5

1 2

– 14 –

Page 15

(2) SETTING EXAMPLE

Outdoor unit

9 8

Outdoor unit

Indoor unit

Wired remote controller

Wireless remote controller

Transmission line

(Non-polar 2 core)

8 7

9 8 7

9 8 7 5 9 8 7 5 9 8 7

0 0 0 0 0 00 1 0 0 0 1

2 (Max.16 Numbers)

9 8

8 7

63 0 163 0263 0363 1463 2563 0 63636 0

9 8 7

OFF ONDIP SW1-1 OFF ONDIP SW1-4

9 8 7

0 0

0 15 0

9 8 7

Central remote controller

OFF ONDIP SW1-1 OFF ONDIP SW1-4

9 8

Refrigeration circuit address Rotary-sw9,8

Instructions for setting up the address

1 The refrigerant system address of the indoor and outdoor units can be set to optional numbers in the range of 0 and 99. 2 Address of the indoor unit can be set to optional numbers in the range of 0 to 15. 3 Set address of the remote controller in the order of 0,1,2,...15.(Blank is impossible) 4 Address of the central remote controller can be set to optional numbers in the range of 0 to 15.

ONDIP SW1-1

Number of the unit

in the group

Refrigeration circuit address Rotary-sw8,7

DIP SW1-1 Remote controller address1 DIP SW1-2 Number of indoor unit connection DIP SW1-4 Remote controller address2

00 01 02 03 04

Central Remote controller (Max.16)

Central remote controller address

8 7

63 0

Indoor unit address Rotary-sw5

Remote controller address Rotary-sw9

– 15 –

Page 16

Refrigerant circuit address (Outdoor unit) Refrigerant circuit address (Indoor unit)

Refrigerant circuit 1 Refrigerant circuit 2

00 01 02

1 1 10 1 2 2 2 20 1 2

Outdoor unit PCB (Address setting No.0

99) 99)

Setting by rotary SW8,9

00 01 02

Indoor unit PCB (Address setting No.0 Setting by rotary SW7,8

Indoor unit address

00 0 01 1 02 2 13 0 14 1 15 003

0 0 0 0 0 0 0

Indoor unit PCB (Address setting No. 0

15)

Setting by rotary SW5

Remote controller address (Indoor unit)

00 0 01 1 02 2 0 03 3 0 04 0 0 05 0

Indoor unit PCB (Address setting No.0

0 0

15)

Setting by rotary SW9

– 16 –

Page 17

Remote controller switch 1

[Master] [Slave]

OFF

Remote controller unit PCB Setting by DIP SW 1-1

No. indoor unit connection

ON OFF

Remote controller PCB

124

Setting by DIP SW 1-2

– 17 –

Page 18

Remote controller switch 2 (Remote controller)

[Master] [Slave]

Remote controller unit PCB Setting by DIP SW 1-4

Central remote controller address

[Master] [Slave]

Central remote controller (Max.16)

Set central remote controller address first,to conduct the initial setting of it.

– 18 –

Page 19

Outdoor

unit

3 4W 50Hz 380 - 415V

1 50Hz 220 - 240V

Transmission line

Indoor

unit

7 8

14 15 16

10 11

3 5 6

Central

remote controller

Wired

remote controller

RB unit

Before test running, check the following items.

Note: RB unit ( ) is for the heat recovery type.

Is the selection of the outdoor unit and the indoor unit correct? (Maximum operating indoor unit, total capacity of the indoor unit)

Is the piping length correct? (Ex. Maximum piping length : 100m)

Is the separate selected correct? Doesn't gas leak? Is the refrigerant flow correct? Are the power supplies connected?

(Power supply for the indoor unit and outdoor unit is separated.) Is the spec. for the power supply cable correct? Is the RB unit cable connected? 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 ) Is the transmission cable connected to all units?

Are the addresses set? (Ex. Refrigerant circuit address, indoor unit address, remote controller address, etc.) Have the all settings done on the PCB? Is the refrigerant valve opened?

Is the power supplied to crank case heater for 12 hours before winter operation?

3 4 5 6 7

8 9

Is the diameter of the pipe selected correct?

12 13 14 15

2-1 CHECK ITEMS BEFORE TEST RUNNING

2. TEST RUN

1 50Hz 220 - 240V

– 19 –

Page 20

2-2 TEST RUNNING METHOD

Supply power to the crankcase heater for 12 hours prior to the start of operation in the winter. The following is the procedure for the test operation.

2-2-1 OUTDOOR PC BOARD

If the test operation is to be done for cooling operation, set DIP switch (SW-1-1) to on. If the test operation is to be done for heating, set DIP switch (SW1-2) to on.

2-2-2 TEST OPERATION USING REMOTE CONTROLLER

(1) Standard wired remote controller For test running, when the remote controller FAN CONTROL button and MASTER CONTROL button are pressed simulta-

neously for more than three seconds when the air conditioner is

not running, the air conditioner starts and TEST is displayed on the remote controller display. However, the SET TEMP./DAY setting button does not function, but all other buttons, displays, and protection functions operate.

CLOCK

NON STOP

SET TIME

TIMER MODE

CLOCK ADJUST

TEST

TEMP./DAY

CONTROL

FAN

COOL

MASTER

CONTROL

When EE : EE blinks at the current time display, there

DAY button ( ) are pressed

simultaneously for more than three seconds, the self

be displayed at the current time display. In addition,

lights, press the START/STOP button and after

CLOCK

NON STOP

SET TIME

TIMER

MODE

CLOCK ADJUST

TEMP./DAY

CONTROL

FAN

COOL

MASTER

CONTROL

operation lamp goes off, perform the same operation.

ZONE

ENERG

SET

is an error inside the air conditioner. If the SET TIME

diagnosis check will start and the error

the remote controller address will be displayed below.

TIMER MODE

CLOCK ADJUST

SET TIME

TEMP./DAY

FAN

CONTROL

MASTER

CONTROL

SET

button ( ) and SET TEMP.

contents will

When the oper

ation

lamp

Stop operation

ZONE

SET

START/STOP

ENERGY SAVE

DAY OFF

– 20 –

ZONE

SET

START/STOP

ENERGY SAVE

DAY OFF

Page 21

Error Code

Error contents

Error Code

Error contents

No error

Model information abnormal

Power supply frequency abnormal

EEPROM access error

EEPROM elimination error

Room temperature thermistor error

Indoor unit heat exchange thermistor

(middle) error

Indoor unit heat exchange thermistor

(inlet) error

Indoor unit heat exchange (exit) error

thermistor

To stop test running, press the START/STOP button. 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 running.

(2) Standard wireless remote controller

Press the remote control unit test run button while the air condi tioner is running.

Blower temperature thermistor error

Drain abnormal

Room temperature abnormal

Indoor unit fan error

Communication error

Node setting error

Parallel communication error

Outdoor unit error

Remote control unit

At the end of test running, press the remote control unit start-

stop button.

Operation can be checked by lighting and flashing of the display section OPERATION and TIMER lamps. Perform judgment in accordance with the following.

Test running

When the air conditioner is run by pressing the remote control unit test run button, the OPERATION and TIMER lamps flash slowly at the same time.

START

STOP

A B C D

START/STOP button

TEST RUN button

– 21 –

Page 22

– 22 –

1) When the test run signal is transmitted from the standard wired remote controller, the wireless remote controller and the central remote controller.

(1) In the test running status, operated in accordance with the setting of each switch besides the room temperature

switch. The room temperature adjustment does not funtion, and then the electric expansion valve is controlled

with maximum flow. (2) De-frosting and de-icing prevention has priority over item(1). (3) After 60 minutes passes, the test run stops.

2) When the test run signal is transmitted from the outdoor unit. (1) Whether state of the indoor unit operates or stops, test run will be made in accordance with the operation

mode of the indoor unit , which belongs to the same refrigerant system.

(2) Test running initialization is shown below.

Air Flow Hi Hi

RoomTemperature Indication 18 30

Vertical Air Direction Panel

Horizontal Air Direction Panel

Swing

Operating Mode Cooling Heating

Initialized position Initialized position

Front Front

OFF

2-3 TEST RUN CONTROL

Page 23

3.REFRIGERANT PIPE SYSTEM DIAGRAM

3-1 COOLING ONLY / HEAT PUMP TYPE

THOA

THHO THHM THHI

THOA

THHO THHM THHI

THOA

THHO THHM THHI

INDOOR UNIT A INDOOR UNIT B INDOOR UNIT C

EEV

HP:High pressure

MP:Middle pressure

LP:Low pressure

HP:High pressure

LP:Low pressure

:Oil sensor

:Dryer

:Pressure switch

THIATHIA THIA

:H.E. middle thermistor

:Outlet air thermistor

:H.E. outlet thermistor

:H.E. inlet thermistor

BV1

SV2

BV2

4WV5

:Discharge thermistor TH

:Heat exchanger

:Thermistor

:4-way valve

:Check valve

:Expansion valve

:Strainer :Pressure sensor

:Power accumulation unit

:Solenoid valve

BV3

TANK

RECEIVER

THs:Suction thermistor

THR:Room temp thermistor

:Capillary tube

THo:Outdoor temp thermistor

THIA:Indoor Room temp thermistor

:Ball valve

OUTDOOR UNIT

SV3

EEV3

SV1

EEV1

SV7

CCUMU A

LATEOR

THS

THHO1

H.E.1

THHI1

COMP.1

COMP.2

COMP.3

SV4

THD1

THD2

OIL

SEPARATER

OIL

SEPARATER

THD3

SV6

SV5

4WV2

OIL

SEPARATER

4WV1

SV8

THHO2

H.E.2

THHI2

4WV3

EEV2

THHO3

THO

H.E.3

THHI3

4WV4

– 23 –

Page 24

3-2 HEAT RECOVERY TYPE

EEV

THIA

THOA

THHO THHM THHI

EEV

THOA

THIA

THHO THHM THHI

R.B UNIT

SVD

SVB2

SVB1

SVs

SVD

SVB2

SVB1

SVs

HP:High pressure

MP:Middle pressure

LP:Low pressure

:Pressure switch

:Strainer :Pressure sensor

:Power accumulation unit

:Heat exchanger

HP:High pressure

LP:Low pressure

:Oil sensor

:Dryer

:H.E. middle thermistor

:H.E. outlet thermistor

:H.E. inlet thermistor

:Discharge thermistor

:Thermistor

:Outlet air thermistor

THs:Suction thermistor

THo:Outdoor temp thermistor

THR:Room temp thermistor

THIA:Indoor Room temp thermistor

THOA

THHO THHM THHI

INDOOR UNIT A INDOOR UNIT B INDOOR UNIT C

EEV

:Solenoid valve

:4-way valve

:Check valve

:Expansion valve

:Capillary tube

:Ball valve

THIA

SVD

R.B UNIT

SVB2

SVB1

SVs

4WV5

H.E.1

BV3

TANK

RECEIVER

EEV3

EEV1

SV8

THHO2

H.E.2

EEV2

THHO3

H.E.3

THO

SV2

SV1

BV2

SV7

HO1

BV1

CCUMU A

LATEOR

THS

OUTDOOR UNIT

SV3

THHI1

COMP.1

COMP.2

COMP.3

SV4

THD1

THD2

OIL

SEPARATER

OIL

SEPARATER

THD3

SV6

SV5

4WV2

OIL

SEPARATER

4WV1

THHI2

4WV3

THHI3

4WV4

– 24 –

Page 25

4. FUNCTION OF PRINTED CIRCUIT BOARD

4-1 PCB LAYOUTS

■

INDOOR UNIT CONTROL CIRCUIT BOARD

CN19 CN20 CN21

CN15

JM1-3

CN10

CN16

CN4

CN11

CN23

CN14

CN18

CN13 CN8

CN22

CN12

CN24

CN26

SW2

SW1

CN17

CN25

SW4

SW3

CN6

SW5

SW9SW7SW8

CN2

CN1

CN3

SW10

■

OUTDOOR UNIT CONTROL CIRCUIT BOARD

CN52

CN53

CN45

CN24

CN25

CN26

CN4

SW9 SW8

CN5

SW6SW7 SW5 SW4 SW3 SW2 SW1

CN27 CN3 4

CN51

CN2 CN22

CN44

CN28

LED4 LED5 LED6

EXT.

INPUT1

CN33

LED1 LED2

LED3

CN43 CN42

EXT. INPUT2

CN32

CN48CN49CN50

CN35

CN29

CN30

CN31

CN1

CN3

CN21

CN20

CN19

CN18

CN17

CN14

CN12 CN10 CN8

CN13 CN11 CN9 CN7

– 25 –

CN5

CN6

Page 26

4-2 MICROPROCESSOR BLOCK DIAGRAM

INDOOR UNIT

■

Power supply

ROOM THERMISTER(CN19) PIPE INLET/IMEDIATE /OUTLET THERMISTER(CN20) OUTLET THERMISTER(CN21)

FAN FEEDBACK

DIP SW(SW1-4)

ROTARY SW(SW5,7,9)

FLOAT SW(CN15)

COMMUNICATION PWB.(CN26)

(CN16)

TEST(CN18)

(CN24)

FILTER CIRCUIT

POWER DETECTION CIRCUIT

TEMPERATURE DETECTION CIRCUIT

FAN ROTATION READ CIRCUIT

SWITCH READ CIRCUIT

FLOAT SWITCH INPUT CIRCUIT

TEST INPUT CIRCUIT

EXTERNAL INPUT CIRCUIT

COMMUNICATION CIRCUIT

RECTIFICATION SMOOTHING CIRCUIT

MICROPROCESSOR

DC-DC CONVERTER 5V,12V,14V

ACTUATOR DRIVE CIRCUIT

SP MOTOR DRIVE CIRCUIT

INDICATOR DISPLAY OUTPUT

EXTERNAL OUTPUT

AUXILIARY HEATER OUTPUT

FAN MOTER(CN4)

DRAIN PUMP(CN5) SV(CN6)

LOUVER(CN10,CN11)

EEV(CN14)

INDICATOR DISPLAY(CN13)

(CN22)

AUXILIARY HEATER(CN12)

(CN24)

Wired remote controller(CN17)

(CN25)

EEPROM

FLASH WRITE CIRCUIT

RESET CIRCUIT

OSCILLATOR CIRCUIT

WIRED REMOTE CONTROLLER READ CIRCUIT

FLASH WRITE CIRCUIT

RESET CIRCUIT

OSCILLATOR CIRCUIT

COMMUNICATION

BUZZER OUTPUT

MICROPROCESSOR

– 26 –

Page 27

OUTDOOR UNIT

■

Power supply

SUCTION/ OUTDOOR/ DISCHARGE TEMP. 1-3(CN27)

PRESSURE SENSOR(CN32-34)

DIP SW(SW1-7) ROTARY SW(SW8,9)

TEST(CN35)

COMMUNICATION PWB.(CN51)

(CN44)

FILTER CIRCUIT

POWER DETECTION CIRCUIT

TEMPERATURE DETECTION CIRCUIT

PRESSURE DETECTION CIRCUIT

SWITCH READ CIRCUIT

TEST INPUT CIRCUIT

COMMUNICATION CIRCUIT

EEPROM

FLASH WRITE CIRCUIT

RECTIFICATION SMOOTHING CIRCUIT

MICROPROCESSOR

DC-DC CONVERTER 5V,12V,14V

ST MOTOR DRIVE CIRCUIT

EEV (CN29-31)

WIRED REMOTE

CONTROLLER(CN17)

OIL SENSOR

SW(CN52,53)

PRESSURE

SW(CN49,50)

(CN49,50)

(CN28)

RESET CIRCUIT

OSCILLATOR CIRCUIT

POWER DETECTION CIRCUIT

TEMPERATURE DETECTION CIRCUIT

OIL SENSOR READ CIRCUIT

PRESSURE SWITCH READ CIRCUIT

EXTERNAL INPUT CIRCUIT

FLASH WRITE CIRCUIT

RESET CIRCUIT

OSCILLATOR CIRCUIT

COMMUNICATION

ACTUATOR DRIVE CIRCUIT

LED OUTPUT

EXTERNAL OUTPUT

COMPRESSOR

(CN24-26)

FAN MOTOR(CN3,4)

4WYV(CN17-21)

SV(CN7-16)

BASE HEATER(CN5)

COMPRESSOR

(CN24-26)

LED(LED1-6)

(CN28)

MICROPROCESSOR

– 27 –

Page 28

4-3 MICROPROCESSOR FUNCTION LIST

■ INDOOR UNIT

INDOOR UNIT TYPE

60,000 54,000 45,000 36,000 30,000

CAPACITY

(BTU/h)

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

CN1 ACIN CN2 TH FUSE CN3 FAN CAPA CN4 FAN MOTOR CN5 DRAIN PUMP CN6 S. VALVE CN8 NETWORK CN10 SP-M(U.D) CN11 SP-M(R,L) CN12

HEATER CN13 DISPLAY CN14 E.E.VALVE CN15 FLOAT SW CN16 CN17

FAN FEEDBACK

WIRED REMOTE

CONTROLLER CN18 TEST CN19 R.TH CN20 P.TH CN21 S.TH CN22 CN23

EXT.OUTPUT

EXT.INPUT CN24 FLASH(MAIN) CN25 FLASH(SUB) CN26 COMMUNICATE SW1 SW2 SW3 SW4

SW5

SW6

SW7

SW8

SW9 SW10

FUNCTION 1

FUNCTION 2

FUNCTION 3

FUNCTION 4

INDOOR UNIT

ADDRESS 1

INDOOR UNIT

ADDRESS 2

REFRIGERANT

ADDRESS 1

REFRIGERANT

ADDRESS 2

REMOTE CONT-

ROLLER ADDRESS

MANUAL AUTO

Large

Ceiling

Universal

Compact Cassette

Large

Cassette

Compact

Duct

Low

Duct

High

Static

Pressure

Duct

Static

Pressure

25 25

Wall

Mounted

– 28 –

Page 29

■ OUTDOOR UNIT

OUTDOOR UNIT TYPE CN1 AC IN CN2 NET CN3 FAN.1 CN4 FAN.2 CN5 BASE HEATER CN6 CRANK CASE HEATER CN7 S.V.1 CN8 S.V.2 CN9 S.V.3 CN10 S.V.4 CN11 S.V.5 CN12 S.V.6 CN13 S.V.7 CN14 S.V.8 CN17 4WV.1 CN18 4WV.2 CN19 4WV.3 CN20 4WV.4 CN21 4WV.5 CN22 TERMINATOR CN24 COMP.1 CN25 COMP.2 CN26 COMP.3 CN27 TH.1 CN28 FLASH W/R S CN29 E.E.V.1 CN30 E.E.V.2 CN31 E.E.V.3 CN32 P.SEN-L CN33 P.SEN-M CN34 P.SEN-H CN35 TEST CN42 P.SW-H CN43 P.SW-L CN44 FLASH W/R M CN45 TH.2 CN48 EXT.OUTPUT CN49 EXT.INPUT2 CN50 EXT.INPUT1 CN51 COMMUNICATION

PWB. CN52 OIL LV-HI CN53 OIL LV-LO SW1 SW2 SW3 SW4 SW5 SW6 SW7

SW8

SW9

FUNCTION 1

REFRIGERANT

ADDRESS 1

REFRIGERANT

ADDRESS 2

AOY90TPAMF

– 29 –

Page 30

4-4 FUNCTION AND SETTING OF EACH SWITCH

■ INDOOR UNIT

1. DIP SWITCH 1

Ceiling height setting. Changeover the fan speed of the indoor fan phase control according to ceiling height (cassette type). Details of rotation is according to DIP SW3 setting.

CEILING HEIGHT SETTING 1,2

Standard High ceiling 1 Low ceiling

SW1-1

SW1-2

(2)

NOTCH

Ceiling height

Room temp correct coefficient of heating.

Decide room temp correct coefficient value of heating.

ROOM TEMP. CORRECT COEFFICIENT OF HEATING

SW1-3

OFF

ON OFF - 2 deg

(3)

(4)

(5)

(6)

OFF

OFF OFF

HIGH(1)

MED

LOW LOW

S-LOW S-LOW S-LOW S-LOW

2.5 3.0m

SW1-4

OFF

3.0 3.5m

Coefficient value

High ceiling 2

HIGH HIGH

MED MED

+ 2 deg

0 degOFF

OFF

ON ON

LOW

more than

3.5m

HIGH

MEDLOW

less than

2.5m

+ 4 degON ON

2. DIP SWITCH 2

Room temp. correct coefficient of cooling.

Decide room temp correct coefficient value of cooling.

ROOM TEMP CORRECT COEFFICIENT OF COOLING

SW2-1

OFF

ON + 2 deg

Zone control switch. Decide the indoor unit for zone control use and not for zone control.

ZONE CONTROL SWITCH

SW2-2

OFF

Coefficient value

0 deg

Switch control

Validity

Invalidity

Ð 12Ð

– 30 –

Page 31

Filter check validity/invalidity. Filter check is set with Dip SW 2-3.

FILTER CLEANING FUNCTION

SW2-3

Filter check

OFF

Auto restart validity/invalidity.

Invalidity

Validity

Auto restart is set with Dip SW2-4. But,when a LCD wired remote controller is connected, auto restart is set to "validity" regardless of the indoor unit setting.

AUTO RESTART SETTING

SW2-4

OFF

Auto restart

Invalidity

Validity

3. DIP SWITCH 3

Indoor unit for speed switch.

This switch has eight kinds of rotation table, and can select fan speed corresponding to each model.

INDOOR UNIT FAN SPEED TABLE

Table No.

SW3-2

SW3-3 OFF

0 1 3

OFF

ONSW3-1

OFF OFF

OFF

OFF OFF

2 4 75

OFF

ON ON

OFF

INDOOR FAN MOTOR SPEED (LARGE CEILING)

Table No.

Models

S-Lo

0 1 3

AB30

Not used

750

600

500 500

2 4 75

AB36

1000850

900

750

Not used Not used Not used

AB45

1100

1000

850

500

Rotating speed of the indoor fan motor is the same for Cooling / Fan / Heating.

AB54

1250

1150

1000

500

Ð 12Ð

– 31 –

Page 32

INDOOR FAN MOTOR SPEED (CASSETTE)

Table No.

Models

(1)

(2)

(3)

(4)

(5)

(6)

Models

(1)

(2)

(3)

(4)

(5)

AU54

680

630

580 550

550 500

500 470

300 300

AU30

500

470

430

390

360

AU45

620

580

Not used

1 2

AU36

580

550

500

470

420

300

5 6

AU25

460

430

390

350

320

Not used

7Table No.

AU20

420

390

350

310

280

(6)

Not used (SW3-4).

Rotating speed of the indoor fan motor is the same for Cooling/Fan/Heating.

300

4. DIP SWITCH 4

Indoor unit model switch.

Indoor unit model (capacity data) is set with SW4-1 4.

INDOOR UNIT MODEL SWITCH

Capacity

Type

SW4-1

SW4-2 OFF

SW4-3

OFF

300

OFF

250

OFF

OFFSW4-4

Ð 12Ð

– 32 –

Page 33

5. JUMPER

Custom code selection of the remote controller.

Custom code of the infrared signal is set with jumper lead combinations which are shown below.Once set, other infrared signal is not accepted.

REMOTE CONTROLLER CUSTOM CODE SELECTION JP1 JP2

Custom code

Not used (JP3)

Connect

Disconnect

Connect

Disconnect

Connect

Disconnect

Type A (Primary setting)

Type B

Type C

Type D

Ð 12Ð

– 33 –

Page 34

■ OUTDOOR UNIT

1. DIP SWITCH 1

Test run. Test run(forced operation) and normal operation are set with SW1-1.2 on the PCB. The cooling/heating operation mode on the test run is set.

TEST RUN SW

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

Pump down operation.

Pump down operation is set with SW1-3 on the PCB.

(OFF-ON)and (operated continuously

more than 1 min. with ON state)

(OFF-ON)and (operated continuously

more than 1 min. with ON state)

( Initial setting)

PUMP DOWN SW

SW1-3 Pump down operation Remarks

OFF Release

ON Operate

Forced defrost operation.

Defrosting is started forcedly with SW1-4 on the PCB.

FORCED DEFROST SW

SW1-4 Forced defrost Remarks

OFF Release

ON Operate

(OFF-ON)and (operated continuously

more than 1 min. with ON state)

(OFF-ON)and (operated continuously

more than 1 min. with ON state)

( Initial setting)

2. DIP SWITCH 2

Night operation fan mode.

The night operation fan mode ON/OFF is set with SW2-1 thermistor detects the temperature less than 30 C and the outdoor unit operation mode is cooling.

NIGHT OPERATION FAN MODE SW

SW2-1

OFF

ON Operate

Snow falling protection fan mode SW.

When the compressor is stopped,snow falling protection fan mode is set with SW2-2.

SNOW FALLING PROTECTION FAN MODE SW

SW2-2

OFF

ON Operate

Night operation fan mode

Release

Snow falling protection fan mode

Release

( Initial setting)

– 34 –

Page 35

Expansion valve initialize.

The pulse of the expansion valve is initialized with SW2-3.

EXPANSION VALVE INITIALIZATION SW

SW2-3

OFF

ON Operate

Forced oil recovery operation.

Forced oil recovery operation started with SW2-4.

Expansion Valve Initialization

Operation

Release

( Initial setting )

Remarks

FORCED OIL RECOVERY SW

SW2-4

OFF

Forced Oil Recovery

Release

Operate

3. DIP SWITCH3 SETTING IS FORBIDDEN

4. DIP SETTING IS FORBIDDEN

5. DIP SWITCH5

SW5-1 and SW5-2 setting are forbidden.1

Base heater validity/invalidity. The base heater setting is performed with SW5-3.

BASE HEATER SETTING SW

SW5-3

OFF

ON Invalidity

Base Heater Setting SW

Validity

6. DIP SWITCH6 SETTING IS FORBIDDEN

( Initial setting )

Remarks

(OFF-ON)+(ON continues for 1 minute)

( Initial setting )

Remarks

7. DIP SWITCH7

System type switch 1,2.

Model change in Heat recovery / Heat pump type / Cooling only type are made with SW7-1,2.

SYSTEM TYPE SWITCH 1/2

SW7-1 Model selectionSW7-2

OFF

Heat Pump

Cooling Only

Heat Recovery

Cannot Set

( Initial setting )

Remarks

8. External input terminal 1/2

When the cooling or heating mode is selected, the priority circuit is set.

With CN49 and CN50.

EXTERNAL INPUT TERMINAL 1/2

Terminal

External input

terminal 1CN50

External input

terminal 2CN49

Conditions

R.C.

External input

Cool

Heat

Setting

OPEN

SHORT

OPEN

SHORT

Remarks

– 35 –

Page 36

■ WIRED REMOTE CONTROLLER

1. DIP SWITCH 1

Remote controller address 1

FINAL REMOTE CONTROLLER SWITCH

SW1-1

Terminator

OFF

ON YES

Indoor unit connection. This is switched according to No. of connected indoor unit.

No. INDOOR UNIT CONNECTION SWITCH

SW1-2

OFF

ON Multiple unit connection

Remote controller address1,2.

Used for setting of the remote controller address. Set the addresses by ordering MASTER SLAVE without any space.

REMOTE CONTROLLER ADDRESS 1,2 SWITCH

SW1-3 SW1-4

OFF

OFF ON Slave

Number of indoor unit

One unit connection

OFF Master

Method

SW1-5 and SW1-6 setting are forbidden.4

2. DIP SWITCH 2

Cooling only / heat pump.

Switching cooling only / heat pump is set with SW2-1.

COOLING ONLY / HEAT PUMP SWITCH

SW2-1

OFF

ON Cooling only

Auto change over validity / invalidity. Auto change over validity / invalidity is set with SW2-2.

AUTO CHANGEOVER SWITCHING

SW2-2

OFF

ON Validity

Operation system

Heat pump

Auto restart

Invalidity

Ð 12Ð

– 36 –

Page 37

SW2-3 setting is forbidden.

Maintenance. Used for indication of the refrigerant system, indoor unit address and error history.

MAINTENANCE SWITCH

SW2-4

Mode

OFF

ON Maintenance mode

SW2-5 setting is forbidden.

Battery backup switch. When installing, turn the SW2-6 ON.

Normal mode

Ð 12Ð

– 37 –

Page 38

■ CENTRAL REMOTE CONTROLLER

1. DIP-SW2

DIP SW2-1 2-2 setting forbidden.

DIP SW 2-1 OFF DIP SW 2-2 OFF

DIP SW2-3 setting.

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

( Factory setting)

SW2-3

Filter check sign indication

OFF

ON Display

DIP SW2-4 setting.

C / F switch

Temperature display is centigratde( ) / Fahrenheit( )

SW2-4

OFF

DIP SW2-5 setting

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

SW2-5

OFF

ON Invalidity

DIP SW2-6 2-7 setting forbidden.

Non-Display

( Factory setting)

C / F

( Factory setting)

RC operation prohibit function

Validity

DIP SW 2-6 OFF DIP SW 2-7 OFF

DIP SW2-8 setting.

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

( Factory setting)

SW2-8

OFF

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

SW42 Initial setting button

This switch is used when initializing the central remote controller.

SRAM Battery

OFF

– 38 –

Page 39

WIRED REMOTE CONTROLLER

■

Display panel

TURE OF CONTROLLER

FEA

Four kinds of timer setup (OFF/ ON1/ ON2/ WEEKLY) are possible.

NON STOP OFFON TIMER WEEKLY

TIMER MODE

CLOCK ADJUST

CLOCK

TIMER

NEXT DAY

SET TIME

OFF ON

ON OFF

CENTRAL

DAY OFF

DEFROST

TEMP./DAY

ZONE

SET

C F

DAY

TEST

FAN

CONTROL

ENERGY SAVE

DAY OFF

AUTOAUTO

COOL DRY FAN HEAT

ANTI FREEZE

MASTER

CONTROL

START/STOP

Equipped with weekly timer as standard function. (2 times Start/Stop per day for a week)

By failure,the error code is displayed. The error history can be displayed,which is convenient for maintenance. 2 remote controllers can be connected. Up to 16 indoor units can be simultaneously controlled. Anti freeze, saving operation and zone control are possible. Favorite timer ( ON 2 )

■

FUNCTIONS

Display

CLOCK

14 13 12 11 10

9 8 7

NON STOP OFFON TIMER WEEKLY

TIMER MODE

CLOCK ADJUST

CLOCK

TIMER

NEXT DAY

CENTRAL

OFF ON

TIMER

DAY OFF

OFF

DEFROST

NEXT DAY

SET TIME

TEMP./DAY

ZONE

SET

20 21 22 23

CENTRAL

OFF

DAY OFF

OFF

DEFROST

DAY

TEST

DAY

FAN

CONTROL

ENERGY SAVE

DAY OFF

C F

TEST

AUTOAUTO

COOL DRY FAN HEAT

ANTI FREEZE

MASTER

CONTROL

START/STOP

AUTOAUTO

COOL DRY FAN HEAT

ANTI FREEZE

2426 252728

START/STOP button Pressed to start and stop operation

Operation lamp Lights during operation and when the timer is on.

Energy save button Turns the energy efficient mode on and off.

Day off button Temporary cancellation of one day timer.

Energy save lamp Lights up when the unit is in the energy save mode.

3 4

5 6

Zone button Use to turn the zone control on and off.

Set button Sets the date, hour, minute and on-off time.

Zone lamp Lights up when the unit is in the zone control mode.

Horizontal air flow direction and swing button Push for two seconds and change swing mode.

Horizontal swing lamp Push for two seconds and change swing mode.

Vertical air flow direction and swing button Push for two seconds and change swing mode.

Vertical swing lamp

Clock adjust button Timer mode button

Changes the timer mode (NON STOP, OFF TIMER, ON TIMER, WEEKLY TIMER).

Set time button Sets the current time and on-off time.

Temp./Day button Sets the indoor temperature / days.

Fan control button Selects the fan speed (AUTO, LOW, MED, HIGH).

Master control button Selects the operating mode(AUTO, HEAT, FAN, COOL, DRY).

Clock display

19 20

Central control display

Set temperature / Day display Fan speed display

Master control display

23 24

Anti freeze display

Day off display Test display

26 27

Defrost display

Timer mode display

– 39 –

Page 40

WIRELESS REMOTE CONTROLLER

■

TURE OF CONTROLLER

FEA

TIM

A B C D

■

FUNCTIONS

Display

10 11

Display panel

CLOCK

AM PM OFF

AUTO

COOL DRY FA

HEAT

H D W

K AM PM O

AUTO

ENERGY SAVE

Four kinds of timer setup (ON/OFF/PROGRAM/SLEEP) are possible.

Up to 16 indoor units can be simultaneously controlled. Both wired and wireless remote controller can be used jointly.

TIMER

ENERGY SAVE

AUTO

12 13

A B C D

TIMER

SLEEP

OFF

TIMER RESET

AUTO

HIGH MED LOW

START/STOP button Pressed to start and stop operation

Set temp./Set time buttons Sets the indoor temp./Sets the current time and on-off time

Master control button Selects the operating mode(AUTO, HEAT, FAN, COOL, DRY).

Sleep timer button Press to select sleep timer.

Signal transmitter

Timer button Press to select the timer mode.(OFF TIMER,ON TIMER,

PROGRAM TIMER,TIMER RESET)

Fan control button

Selects the fan speed (AUTO, LOW, MED, HIGH).

Battery compartment lid

Air flow direction button

Use to set the desired air flow direction & SWING function.

Energy save button Turns the energy efficient mode on and off.

Code change (Slide Switch) Switching the remote control unit code.(Max.4 units)

Time adjust button Set the current time.

Test run button

This button is used when testing the air conditioner after installation.

ACL button This button is used when replacing batteries.

Transmit indicator Clock display

16 17

Master control display

Timer mode display Fan speed display

19 20

Set temperature display Timer set indicator

21 22

Temperature set indicator

– 40 –

Page 41

CENTRAL REMOTE CONTROLLER

SETTINGMONITOR MEMORY

ERROR

SUN SATFRITHU

WED

TUE

MON

CLOCK

ADDRESSADDRESS

NON STOP

OFF TIMER

WEEKLYWEEKLY

■

FEATURE OF CONTROLLER

NEXT DAYNEXT DAY

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

ONON

OFFOFF

40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

OFFOFF

80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

x100

ALL/GROUP

SELECT

TEST

CENTRAL CONTROL

ALL

100

Up to 400 indoor units/64 groups can be controlled with one central remote controller. Up to 16 central remote controllers can be connected in one system. Central remote controller can control by all/group/individual. By setting the central remote controller, it is possible to lock the function of the standard

controllers. Items of selections are all functions, timer mode, disabling all functions for certain hour, operating mode, temperature setting, reset filter, and On/Off. Weekly timer is equipped as standard function. (2 times On/Off per day for one week).

Setting contents of central remote controller are all memorized, so that each indoor unit can be operated in the memorized condition even if the operating conditions are changed later on. Error code is displayed when it occurs. The history of failure can also be displayed, which is convenient for maintenance.

FILTER

ZONE

ON OFF

ALL

OFFON

TEMP

ENERGY

SAVE

ON OFF

LOUVER

OPERATION

OFF

AUTO

COOL DRY FAN HEAT

FIXED

ANTI

FREEZE

ON OFF

DEFROST

Examples of error:

1. Communication/micro computer error

2. Abnormal heat exchanger thermistor

3. Float switch operating

4. Abnormal outdoor unit thermistor

5. Abnormal discharge temperature

6. Abnormal oil sensor

7. Excessive indoor units connected

8. Abnormal indoor fan

■

FUNCTION

32 31 30 29 28 27

26 25 24

SUN SATFRITHU

MON

CLOCK

ADDRESSADDRESS

NON STOPNON STOP OFF

TIMER

WEEKLYWEEKLY

CLOCK

ADJUST

TIMER MODE

TIMER

COPY

9. Abnormal room temperature thermistor

10. Abnormal air blow temperature thermistor

11. 3 phase reverse polarity connection

12. Abnormal pressure

13. Abnormal refrigerant pressure sensor

14. Duplicated indoor unit address

15. Duplicated outdoor unit address

Display

133

SETTINGMONITOR MEMORY

ERROR

TEST

SET

CHECK

CENTRAL CONTROL

ALL

TEST

WED

TUE

AM PM

DAY

DAY OFF

NEXT DAYNEXT DAY

0000 0101 0202 0303 0404 0505 0606 0707 0808 0909 1010 1111 1212 1313 1414 1515 1616 1717 1818 1919 2020 2121 2222 2323 2424 2525 2626 2727 2828 2929 3030 3131 3232 3333 3434 3535 3636 3737 3838 3939

ONON

OFFOFF

4040 4141 4242 4343 4444 4545 4646 4747 4848 4949 5050 5151 5252 5353 5454 5555 5656 5757 5858 5959

6060 6161 6262 6363 6464 6565 6666 6767 6868 6969 7070 7171 7272 7373 7474 7575 7676 7777 7878 7979

OFFOFF

8080 8181 8282 8383 8484 8585 8686 8787 8888 8989 9090 9191 9292 9393 9494 9595 9696 9797 9898 9999

x100

ALL/GROUP

SELECT

100

TIME

TIMER

DELETE

TIMER

SET

MEMORY

OPERATION

MEMORY SETTING

CENTRAL CONTROL

GROUP

SETTING

BACK

DELETE

ZONE

FILTER

RESET

FILTER

ZONE

ON OFF

ALL

OFFON

ENERGY

SAVE

ON OFF

TEMP

ENERGY

SAVE

ON OFF

LOUVER

OPERATION

OFF

TEMP.

AUTO

FAN

CONTROL

AUTO

COOL DRY FAN HEAT

FIXED

ANTI

FREEZE

ON OFF

DEFROST

MASTER CONTROL

ANTI

FREEZE

2 3 4 5 6 7

8 9

2223

1617

11 10

– 41 –

Page 42

All ON/OFF button

All ON/OFF LED

Back button

Zone button

Energy save button

Fan control button

Master control button

Anti freeze button

Horizontal Air flow direction and swing button

Vertical Air flow direction and swing button

Temp button

ON/OFF button

Filter reset button

Delete button

Test button

Set button

Set LED

Check button

Group setting button

Memory setting button

Timer set button

Time button

Day off button

Timer copy button

Timer mode button

Clock adjust button

Day button

Timer delete button

Memory operation button

Central button

All/Group button

Select 100 button

Select button

Change over the zone. Starting energy save operation.

Setting of indoor temperature. ON/OFF setting by groups.

Delete of setting.

Transmission of all changed setting details. Blinks when transmission is necessary. Confirmation of address setting and error code. Setting of group of some remote controller group connected to the central remote controller. Memory the setting contents of all. Setting of dates, hours, minutes and on-off time. Setting of on-off time. Temporary cancellation of one day timer. Copying the timer condition (the day before). Changeover the timer mode (NON STOP, OFF, ON1, ON2, WEEKLY).

Operating the memorized condition. Forbid some operation of the individual remote controller. Changeover of control unit (ALL GROUP R.C.GROUP). Remote controller group indication by hundreds. Change to remote controller and group number.

Display panel

SUN SATFRITHU

TUE

MON

CLOCK

ADDRESSADDRESS

NON STOPNON STOP

OFF

TIMER

WEEKLYWEEKLY

Day of the week display

Status display

Transmit indicator display

Central control display

Filter reset display

Zone display

WED

NEXT DAY

ERROR

TEST

CENTRAL CONTROL

ALL

3534

SETTINGMONITOR MEMORY

0000 0101 0202 0303 0404 0505 0606 0707 0808 0909 1010 1111 1212 1313 1414 1515 1616 1717 1818 1919 2020 2121 2222 2323 2424 2525 2626 2727 2828 2929 3030 3131 3232 3333 3434 3535 3636 3737 3838 3939

ONON

OFFOFF

4040 4141 4242 4343 4444 4545 4646 4747 4848 4949 5050 5151 5252 5353 5454 5555 5656 5757 5858 5959

6060 6161 6262 6363 6464 6565 6666 6767 6868 6969 7070 7171 7272 7373 7474 7575 7676 7777 7878 7979

OFFOFF

8080 8181 8282 8383 8484 8585 8686 8787 8888 8989 9090 9191 9292 9393 9494 9595 9696 9797 9898 9999

x100x100

49 48

Temperature display

Energy save display

Fan control display

Master control display

Fixed cooling or heating operation display

45 46 47 48 49 50

– 42 –

FILTER

ZONE

ON OFF

TEMP

ENERGY

SAVE

ON OFF

OPERATION

OFF

Anti freeze display Defrost display Air flow direction display ON/OFF display Group control display ON/OFF time display

LOUVER

4241

AUTO

COOL DRY FAN HEAT

FIXED

ANTI

FREEZE

ON OFF

DEFROST

Timer mode display

Clock and address display

44 45

Page 43

5. OUTDOOR UNIT OPERATION CONTROL

5-1 COMPRESSOR OPERATION CONTROL

5-1-1 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 4-way valve 1 restart switching

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 ",

are stopped.

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

all the compressors

Defrosting Oil recovery

5-1-2 COMPRESSOR OUTPUT PATTERN

The output pattern of a compressor is defined as shown below.

Compressor output pattern

OUTPUT PATTERN

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

COMPRESSOR 1 (2HP)

OFF ON OFF ON OFF ON OFF ON

COMPRESSOR 2 (4HP)

OFF OFF ON ON

OFF OFF ON

5-1-3 3 MINUTES RESTART PREVENTION (3 MIN ST)

COMPRESSOR 3 (6HP)

OFF OFF OFF OFF ON ON ON ON

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.

– 43 –

Page 44

5-1-4

If compressor 1, 2, or 3 fails, or if two or more compressors fail at the same time, the remaining compressor(s) perform temporary 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 7) 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)

COMPRESSOR RECOVERY OPERATION

ORDINARY OPERATION

COMPRESSOR RECOVERY OPERATION

RECOVERY OPERATION

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

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

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

x : The compressor is stopped by a protection function or abnormal operation. (The figures show the compressor capacity (HP) that permits system operation.)

– 44 –

Page 45

5-2 HEAT EXCHANGE CAPACITY CONTROL

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

1. Cooling, mainly cooling

Pattern

1 2 3 4 5 6

2. Heating, mainly heating

Pattern

1 2 3 4 5 6

4-way valve (4WV)

4WV2 4WV3 4WV4

OFF ON ON OFF ON OFF

4WV2 4WV3 4WV4

ON ON ON ON ON ON

ON OFF ON ON OFF OFF

4-way valve (4WV)

ON ON ON ON ON ON

ON ON OFF OFF OFF OFF

ON ON ON ON ON ON

Solenoid valve

(SV)

SV7 SV8

ON OFF OFF ON OFF ON

Solenoid valve

SV7 SV8

ON OFF OFF ON OFF ON

OFF ON OFF OFF ON ON

(SV)

OFF ON OFF OFF ON ON

Electronic expansion

valve (EEV)

EEV1

Control pulse Control pulse 0 pulse Control pulse Control pulse Control pulse

Electronic expansion

EEV1

Control pulse Control pulse 0 pulse Control pulse Control pulse Control pulse

0 pulse 0 pulse Control pulse Control pulse Control pulse Control pulse

valve (EEV)

0 pulse 0 pulse Control pulse Control pulse Control pulse Control pulse

exchange (HP)

EEV2 2

exchange (HP)

EEV2 2

Used heat

Remarks

4 6

Cooling 2HP Cooling 4HP Cooling 6HP Cooling 8HP Cooling 10HP Cooling 12HP

Used heat

Remarks

4 6

Cooling 2HP Cooling 4HP Cooling 6HP Cooling 8HP Cooling 10HP Cooling 12HP

3. Stop and same capacity operation

Pattern

1 2

4-way valve (4WV)

4WV2 4WV3 4WV4 SV7 SV8

OFFONOFFONOFFONOFF

Solenoid valve

(SV)

OFF

Electronic expansion

valve (EEV)

EEV1

Control pulse 0 pulse

Used heat

exchange (HP)

EEV2 2 4 6

Remarks

Stop

Same capacity

– 45 –

Page 46

5-3

OUTDOOR FAN MOTOR CONTROL

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, the operating mode of the outdoor unit is changed, fan speed at each operating mode after changing is controlled.

When the defrosting operation is performed

When the deicing operation is performed When the same capacity cooling or heating mixed operation is performed

When the overload protection operation during heating operation is performed

Fan Speed

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

FAN SPEED

*Intermittent output

1. Stop (FAN 1)-Stop (FAN 2) for 50 sec.

2. Lo-Stop is repeated for 20 sec.

3. The intermittent output is always started from Stop-Stop of 50 sec.

4. The Stop-Stop of 50 sec at the intermittent output is not a Stop of the outdoor fan.

5. But the outdoor fan shall operate at a cycle of Stop-Stop for 50 sec and Lo-Stop for 20 sec.

FAN 1

Intermittent

Stop Stop

FAN 2

Stop

– 46 –

Page 47

Fan Speed Switching

(a) Fan Control of cooling mode and cooling principal mode. The fan motor is operated at fan speed shown in Table 1 from the outside temperature.

Table 1 Fan speed switching from the outside temperature

OUTSIDE TEMPERATURE

THO>

THo

(b) Fan control Heating mode and Heating principal mode.

The fan motor is operated at fan speed shown in Table 2 from the outside temperature.

Table 2 Fan speed switching from the outside temperature

OUTSIDE TEMPERATURE

THO>

THo

(THO)

USUAL NIGHT OPERATING MODE

USUAL

(c)

Same capacity fan control When the operating mode of the outdoor unit is the same capacity mode, the fan 1/2 are turned off. When the operating mode of the outdoor t

o another operating mode, the fan operates in accordance with fan speed at the start of that mode.

(d) Oil recovery fan control

The fan control in the cooling mode is performed at the time of oil recovery.

unit is changed from the same capacity operating mode

– 47 –

Page 48

5-4 EXPANSION VALVE 1/2 CONTROL

The expansion valves have the following four states:

CONTROL STOP : Power is not yet supplied to the outdoor unit so the expansion valve does not operate.

STAND BY : Power is supplied to the outdoor unit and the expansion valve is initialized, but automatic control of

the expansion valve has not been performed.

WATCHING : The compressor is turned off while the expansion valve is controlled automatically and the turn-on and initialization of the next compressor's expansion valve have not been performed.

CONTROLLING : The expansion valve is controlled automatically.

EXPANSION VALVE CONTROL

CONTROL STOP

STAND BY

AUTOMATIC CONTROL OF EXPANSION VALVE

OIL RECOVERY

Power ON

Power OFF

Compressor ON condition EEV initialization condition interval under 4hours

WATCHING

DEFROSTING

* Only one side of them is controlled.

Compressor OFF

Compressor ON condition

Expansion valve initialization condition interval more than 4 hours

Oil recovery condition

Oil recovery finish

Defrosting condition

Defrosting finish

– 48 –

Page 49

5-5 FOUR-WAY VALVE 1 CONTROL

Four-way valve 1 (4WV1) operates for "Cooling/heating selection" type only.

1. 4-way valve delayed switching

When the outdoor operation mode is Stop, 4-way valve 1 maintains its state and turns off 2 minutes 35 seconds later. However, when the outdoor unit operation mode is switched from " Heating " to " Cooling ", this function does not operate and the 4-way valve turns off at that point.

2. Restarting 4-way valve switching

When the compressor satisfies the OFF ON condition when the operation mode is "Heating" (including immediately after the power is turned on), 4-way valve 1 turns off for 5 seconds. Thereafter, 4-way valve 1 turns on and 3 seconds later, the compressor starts. However, except in the following cases: Defrosting, defrosting end Oil recovery in progress, oil recovery end

Operation example (Restarting 4-way valve switching)

Compressor ON condition

Compressor

3 mins ST 3 secs

4-way valve 1

Outdoor Fan

3. 4-way valve 1 setting by operation mode

Four-wave valve 1 is set according to the operation modes as shown below.

5 secs

OFF

4-way valve 1 control by operation mode

Operation modeSystem type 4WV1

Cooling / Heating selection type

*1) 4-way valve 1 delayed switching control compatible

Cooling Heating

Stop

OFF ON OFF*

– 49 –

Page 50

5-6

CIRCULATING SAVE AMOUNT CONTROL

* Expansion Valve Control

As there is the difference between compressor’s actual capacity and compressor’s requirement capacity practically, capacity by the difference is bypassed as a circulating save amount. ( Compressor’s actual capacity – Compressor’s requirement capacity )

Start condition

In case of other than that the compressor 1 (2 HP compressor) is operated by only one compressor.

In case of the operating mode of " Cooling " or " Heating "

End condition In case of only one compressor (2 HP compressor) operation.

In case of the operating mode other than " Cooling " or " Heating "

– 50 –

Page 51

5-7 SOLENOID VALVE 2 CONTROL

The outdoor unit operates at the time of the same capacity operation. When the difference between compressor's actual requirement capacity obtained by cooling (or heating) requirement capacity from the indoor unit is saved

(bypassed) as a circulating save amount, the electromagnetic valve 2 is controlled.

capacity fixed by a compressor and compressor's

– 51 –

Page 52

5-8 FOUR

System type switching

The 4-way valve 5 is used properly depending on the model as shown below.

4-WAY VALVE 5

4-Way valve 5 setting by the operating mode

2) (a) 4-Way valve 5 setting by the operating mode

-WAY VALVE 5 CONTROL

HEAT RECOVERY

TYPE

: Used (ON/OFF operation under condition)

: Not used (always OFF)

4-Way valve 5 control

HEAT PUMP

TYPE

COOLING ONLY

TYPE

OPERATING MODE

Stop

Cooling

Heating

Same performance

(b) Delay switching

When the operating mode is changed to Stop, the 4-way valve 5 maintains a start of the operating mode before changing, and when the operating mode is other than Stop before three minutes pass it follows the above 1)

4-WAY VALVE 5 CONDITIONS

OFF

immediately.

– 52 –

Page 53

5-9 DEFROSTING CONTROL

1. Defrosting start conditions

1) Defrosting start conditions When the forced defrosting SW was operated, or all of the following conditions are satisfied, defrosting starts. Operation mode is "Heating" and the integrated operating time in the state in which any of the compressors is operating has reached 40 minutes or longer When the operating time of any compressor is the specified time (A minutes) or longer. Where, A is defined as follows: When the "all compressors stopped" state has continued for 20 minutes or longer before any compressor operates A=10 Other than the above A= 6 When the outlet temperature of each heat exchanger is -5 C or less

2) Integrated time The time the operation mode is "Heating" and the time any compressor has operated are integrated. However, the integrated value is cleared in the following cases: Operation mode is switched to other than "Heating" Defrosting has ended Oil recovery operation is in progress and the heat exchange outlet temperature satisfies the defrosting end condition

2. Defrosting start restrictions

In the following cases, defrosting is not performed even if the previously mentioned defrosting start conditions are satisfied. Oil recovery operation is in progress Error that prohibits defrosting operating was generated Error other than compressor 1, 2, or 3 error, suction thermistor error, oil sensor error, oil recovery error, or EEPROM access error. Following protection function has operated (Compressor OFF) Compressor OFF by discharge temperature protector 1, 2, and 3 and high pressure protector, low voltage protector, defrosting operation

3. Defrosting end condition

When any of the following conditions is satisfied, defrosting ends. Outdoor unit operation mode was switched to other than "Heating" 20 minutes or longer have elapsed since defrosting stopped Integration of compressor operation time after start of defrosting has exceeded 15 minutes The following error was generated Errors except compressor 1, 2, and 3 error suction thermistor error, oil sensor error, oil recovery error, or EEPROM access error Each heat exchanger outlet temperature has reached defrosting end heat exchanger temperature 10 C or higher.

– 53 –

Page 54

5-10 OIL RETURN CONTROL

There are two oil return controls, one is the individual oil return and the other one is centralized oil return. (1)

When each solenoid valve is turned ON, the oil return is performed

(2)

Oil level status is defined in accordance with performance of the oil level sensor.

1. Oil return solenoid valves

Solenoid valve Application

OIL

SEPARATER

OIL

SEPARATER

OIL SEPARATER

SV3

SV4

SV5

SV6

COMP.1

COMP.2

COMP.3

Individual oil return

Solenoid valve SV3

SV4 SV5

Central oil return

SV6

2. Oil sensors The oil sensors determine the oil level.

Definition

Oil sensor

of state

State 0 State 1

OFF ON

The oil is filled up to oil sensor U (upper limit). The oil level is between oil sensor U

(upper limit) and oil sensor L (lower limit).

OFF

State 2 State 3

ON OFF

Oil sensor L (lower limit) cuts the oil level.

OFF

Abnormal state ("Oil level error")

Oil sensor U Oil sensor L

Definition of oil sensor operation (oil sensor U/L)

Compressor 1 Compressor 2 Compressor 3

Compressor 1/2/3

Contents of

state

State 0 State 1 State 2

Compressor upper limit oil level sensor Compressor lower limit oil level sensor

Oil sensor circuit output judgment standardOperation

Sketch

Oil sensor U

Oil sensor L

OFF

Oil sensor LED (Voltage detected before output) - (voltage detected after output) < 0.3V max.

Oil sensor U/L

Oil sensor LED (Voltage detected before output) - (voltage detected after output) 0.3V max.

> =

3. Individual oil return control

When a compressor operates continuously for 1 minute or longer and the oil sensor satisfies any of the following conditions in "State 1" or "State 2", the solenoid valve corresponding to the compressor turns on and controls oil return. (1) The integrated operating time of each compressor has reached 15 minutes or greater (2) Each compressor is stopped. * When oil return starts, the integrated operating time for each compressor is reset.

4. Central oil return control

When any of the following conditions is satisfied, the central oil return solenoid valve SV6 turns on and central oil return control begins. (1) One or more compressors are operating and the integrated time in the "1 or more compressors operating" state exceeds 15 minutes (2) All the compressors were stopped from the "1 or more compressors operating" state.

– 54 –

Page 55

5-11 OIL RECOVERY CONTROL

When any the following conditions is satisfied, the indoor fan stops and " Oil recovery operation " starts.

(1) One or more compressor are operating.

(2) The integrated operating time in the " 1 or more compressors operating state " has exceeded 4-6 hours.

(3) Defrosting is not performed.

However the first oil recovery operation after the power is turned on is performed when the integrated operating

time in the " 1 or more compressors operating " state has exceeded 1 hour.

Compressor 1

Compressor 2

Compressor 3

Indoor Fan

Oil recovery start

A mins

1 min

Oil recovery end

OFF

When oil recovery error not generated A= 4-6 mins

When oil recovery error generated A= 7-9 mins

– 55 –

Page 56

5-12 PROTECTION FUNCTIONS

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", 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

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. 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 (PH)

detected value is 3.34MPa or greater, 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 (HP) 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 (HP) 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 (HP) turned on (2) Oil recovery control starts (3) Defrosting control starts (4) Mode is switched to other than "Heat"

– 56 –

Page 57

5-13 PUMP DOWN CONTROL

(1) If the following condition was satisfied, the pump down control starts.

When the operation mode is stopped and pump down DIP-SW turns OFF ON.

(2) Pump down flow-chart.

OUTDOOR UNIT

Operation mode " STOP "

DIP-SW " ON " +30sec

DIP-SW " OFF "

Stand by

DIP-SW " ON "

Compressor 1 3 " ON "

Electronic expansion valve 1/2 : 500 pulse

DIP-SW " OFF "

6 minutes or longer have elapsed since pump down started or discharge pressure 3.0MPa or greater

Compressor 1 3 " OFF " ( Error )

– 57 –

Page 58

INDOOR UNIT When the indoor unit receives the “Pump down signal” from the outdoor unit, the indoor unit is performed following operation.

Starts receiving pump down signal

Electric expansion valve

: 1900 pulse RB unit Discharge valve : ON Suction valve : ON Bypass valve : ON Indoor fan motor : Hi

Finish receiving

defrost signal

Yes

RB unit Discharge valve : OFF Suction valve : ON Indoor fan motor : OFF

Operation stops

(3) Pump down is completed in following cases.

When pump down DIP-SW is turned ON OFF When the discharge pressure sensor detects more than 3Mpa.

– 58 –

Page 59

6. INDOOR UNIT OPERATION CONTROL

6-1 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:

NON STOP

OFF

ON1

ON2

WEEKLY

1) OFF timer

Use when going to bed or otherwise to stop operation. When the clock reaches the set time, the air conditioner will be turned off.

2) ON timer 1

When the timer mode is set to "ON TIMER" , operation automatically starts when the set time has elapsed.

Remote control button selected

OFF

TIMER

MODE

CLOCK ADJUST

CLOCK

TIMER

SET TIME

OFF

TEMP./DAY

ZONE

SET

OFF timer setting

OFF

SET

ON timer setting

FAN

CONTROL

START/STOP

ENERGY SAVE

DAY OFF

COOL

MASTER

3) ON timer 2

The timer function is designed to bring your room to a comfortable temperature by the set time ; as a result, the unit automatically begins operation before the set time so that the room reaches the desired temperature by the time set on the timer ("Favorite temperature timer") The hotter it is in summer, or the colder it is in winter, the earlier that operation will begin.

During Heating Operation.................

from 45 to 10 minutes before set time.

During Cooling/Dry Operation...........

from 20 to 10 minutes before set time.

During Fan Operation.......................

at the set time.

4) 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).

SET

– 59 –

Page 60

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 SET 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.

WEEKLY

1 2

TIMER

MODE

CLOCK ADJUST

TIMER

SET TIME

OFF

DAY

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

COOL

MASTER

CONTROL

START/STOP

DAY CODE DAY OF THE WEEK

MON2TUE3WED4THU5FRI6SAT7SUN

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.)

5. 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.

6. 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.

7. 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.

Repeat the operations described in Steps 4 to 7 to set the sec-

8. ond 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.

WEEKLY

TIMER

MODE

CLOCK ADJUST

TIMER

SET TIME

OFF

DAY

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

MASTER

CONTROL

START/STOP

WEEKLY

TIMER MODE

CLOCK ADJUST

TIMER

SET TIME

OFF

DAY

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

MASTER

CONTROL

START/STOP

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

– 60 –

Page 61

9. Press the SET TEMP./DAY button to select another day for setup. The repeat steps 4 to 8 above to set the ON and OFF times for that day.

CLOCK

10.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.

NOTES:

If no time values are flashing, the clock display will automatically reappear after 15 seconds if no buttons are pressed.

(1) (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.

Cannot set

5 min.

Available range Cannot set

ON OFF ON OFF

Previous day’ s WEEKLY

settings

0:00 0:00

(5)

If you set the OFF time to occur on the day following the ON time, the NEXT DAY caption appears on the display.

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.

5 min.

Next day’ s WEEKLY

WEEKLY

TIMER

NEXT DAY

WEEKLY

TIMER MODE

CLOCK ADJUST

settings

OFF

CLOCK

TIMER

SET TIME

DAY

OFF

DAY

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

COOL

MASTER

CONTROL

START/STOP

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 SET 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.

– 61 –

Page 62

About the DAY OFF

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.

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

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.

Effective range of DAY OFF setting

ON OFF

WEEKLY setting for preceding

Preceding day DAY OFF day

day

0:00 0:00

WEEKLY setting

CLOCK

TIMER

WEEKLY

SET TIME

TIMER MODE

CLOCK ADJUST

(Tuesday).

OFF

Next day

OFF

DAY

DAY OFF

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

COOL

MASTER

CONTROL

START/STOP

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

WEEKLY

CLOCK

TIMER

DAY OFF

COOL

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.

– 62 –

Page 63

Cancelling Selected Time Settings

TIMER

DAY

WEEKLY

AUTO

OFF

TIMER MODE

START/STOP

CLOCK ADJUST

SET TIME TEMP./DAY FAN

CONTROL

MASTER

CONTROL

AUTO

DEFROST TEST

SET

DAY OFF

TIMER

DAY

WEEKLY

AUTO

OFF

AUTO

DEFROST TEST

TIMER

DAY

WEEKLY

AUTO

OFF

AUTO

DEFROST TEST

WEEKLY 1ONWEEKLY 1

OFF

WEEKLY 2ONWEEKLY 2

OFF

ON OFF

WEEKLY 1

ON OFF

WEEKLY 1

Change

Time

Temporary overlap

Change

Time

ON OFF

WEEKLY 1

ON OFF

WEEKLY 2

OFF ONON OFF

WEEKLY 1 WEEKLY 2

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.

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

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

WEEKLY

TIMER MODE

CLOCK ADJUST

TIMER

SET TIME

OFF

DAY

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

MASTER

CONTROL

START/STOP

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.

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.

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.

Example : Clearing the "WEEKLY 1" ON/OFF

times for day 4 (Thursday).

WEEKLY

TIMER MODE

CLOCK ADJUST

TIMER

SET TIME

OFF

DAY

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

MASTER

CONTROL

START/STOP

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.

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.

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

(2)

– 63 –

Example : Changing the "WEEKLY 2" ON setting

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

WEEKLY

TIMER MODE

CLOCK ADJUST

TIMER

SET TIME

OFF

DAY

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

MASTER

CONTROL

START/STOP

Page 64

6.2 FAN CONTROL

6-2-1 "AUTO" POSITION

1) COOLING OPERATION

Air flow mode is set automatically in accordance with the condition "(Room temp. - Set temp.)" as shown at the right.

Fan speed zone

2 C or more Less than 2 C

1 C or more Less than 1 C

When the room temperature lowers

Hi zone

Med zone

Low zone

3 C or more Less than 3 C

2 C or more

Less than 2 C

When the room temperature rises

2) HEATING OPERATION

(1) When the indoor heat exchanger temperature reaches 47 C or more, the fan mode switches to the next higher posi-

tion ("LOW" → "MED", "MED" → "HIGH").

(2) When the indoor heat exchanger temperature drops below 41 C while the compressor operates, the fan mode switch-

es to the next lower position ("HIGH" → "MED", "MED" → "LOW").

(3) After switching the fan mode, it does not switch again within 2 minutes. (4) When "FAN CONTROL" is switched to "AUTO" while the unit is operated at the "FAN CONTROL" position of "HIGH",

"MED" or "LOW", the unit operation is performed in the "MED" fan mode.

An example for heat operation

Indoor heat

•

47 C

exchanger temperature (T

R C)

41 C

(2)

(1)

Tn C

TIME →

(3)

Indoor fan speed

• mode

HI MED LOW

2min

OFF

3) DRY OPERATION

"Indoor fan motor" operates with "Lo" fan speed despite of "FAN CONTROL" mode.

• Expansion

• valve

• Indoor fan motor

OPEN CLOSE

ON OFF

30s

ON ON ON

30s

3min

120s

3min

TIME →

(1) The indoor fan motor starts operation after 5 seconds when the air condition starts operation or the refrigerant circulation

is activating when the operation mode is changed from other OPERATION MODE to “DRY”. (2) The indoor fan motor stops after 30 seconds from the refrigerant circulation stops. (3) During the indoor unit operation, the indoor fan motor will be operated for 120 seconds when the refrigerant circulation

continuously stops over 3 minutes.

4) FAN OPERATION

The fan operates continuously with Lo mode.

6-2-2 "LOW", "MED" AND "HIGH" POSITION

The indoor fan operates at the air flow set in the FAN CONTROL mode.

– 64 –

CLOCK

NON STOP

TIMER MODE

CLOCK ADJUST

SET TIME

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

AUTO

MASTER

CONTROL

START/STOP

Page 65

6-3 MASTER CONTROL

6-3-1 OPERATION MODE CONTROL

Each operation mode is controlled as below. (1) Stop motion

Indoor fan motor : OFF RB unit discharge valve : OFF RB unit suction valve : OFF RB unit by-pass valve : OFF Electric expansion valve Drain pump

(2) Cool, Fan, Heat and Dry Mode

Indoor fan motor Operates according to

the AIR FLOWMODE setting. (Except Monitoring)

RB unit discharge valve

RB unit suction valve

RB unit by-pass valve

Drain pump Turns ON-OFF by the drain pump control function

: Stop pulse : Turns ON-OFF by the drain pump control function

Cool Fan Heat Dry

OFF

Operates according to the AIR FLOW-MODE setting.

OFF

OFF OFF

OFF

Operates according to the AIR FLOW-MODE setting besides followings.

Cold air prevention Defrost operation Monitoring

See the fan control page.

OFF

Remarks

Heat recovery type Only

Electrical expansion valve

Pulse controlled by the temperature

Stop pulse Pulse controlled by the

compensation and the de-icing function

6-3-2 "AUTO"(AUTO CHANOVER) POSITION

If the autochangeover is selected,the following control is performed.

AUTO CHANGEOVER operation (HEAT RECOVERY TYPE )

"Cool" or "Dry"

"Automatic Operation" Signal reception

"Shunt controller" : Suction valve OFF Bypass valve ON "Electronic expansion Valve" : 40 pulses "Indoor fan motor" : S-LO Demand capacity signal transmission

"Shunt controller" : Discharge valve OFF Demand capacity signal transmission

"Shunt controller" : Bypass valve ON "Electronic expansion Valve" : 40 pulses "Indoor fan motor" : S-LO

"Heat" "Fan" or "Start"

"Automatic Operation" Signal reception

50 sec Mask

temperature compensation and the defrosting function

Pulse controlled by the temperature compensation and the de-icing function

"Automatic Operation" Signal reception

Indoor Fan Motor : S-LO

"Mask" means "Timer time-up ".

Heating operation

Cooling operation

Note2

YES

Note1

Monitoring 1

Ts–2

Ts+2

– 65 –

Note3

Monitoring 2

Note3

Page 66

Cooling operation

"Shunt controller" : Discharge valve OFF Suction valve ON Bypass valve OFF "Electronic expansion Valve" : Rated electronic expansion valve pulse "Drain pump" : ON

Heating operation

"Indoor fan motor" : OFF "Shunt controller" : Suction valve OFF Bypass valve OFF

"Electronic expansion Valve" : Rated electronic expansion valve pulse

90 mask

90 sec mask

6 mins timer reset

Note4

6 mins timer set

Demand capacity 0 ?

"Shunt controller" : Suction valve OFF Bypass valve ON "Electronic expansion Valve" : 40 pulses "Indoor fan motor" : S-LO Demand capacity signal transmission

YES

6 mins mask

YES

Cooling operation?

YES

"Shunt controller" : Discharge valve OFF

"Shunt controller" : Bypass valve ON "Electronic expansion Valve" : 40 pulses "Indoor fan motor" : S-LO Demand capacity signal transmission

50 sec mask

YES

– 66 –

Page 67

Note 1. Monitoring 1 performs the following for 60 seconds and detects the " Room temperature " from the point that " Operation started ". " Indoor unit fan motor " : S-LO " Shunt controller discharge valve " : OFF " Shunt controller suction valve " : OFF " Shunt controller bypass valve " : ON

Note 2. Room temperature monitoring state. If " Room temperature " ( TR ) is 2 lower than the " Set temperature " ( TS ) , " Heating " is decided and if it is higher than 2 , " Cooling " is decided. The system operates at S-LO until the operation mode is decided as " Heating " or " Cool " . This state is made monitoring 2.

Note 3. 2: [ deg ].

Note 4. When the system is in the " Refrigerant circulation stop " state continuously for 6 minutes after " Heating " or " cooling " was decided, returns to a. However ,this 6 minutes do not include " Refrigerant circulation stopped " by a protection function.

COOLING

-2

HEATING

Fig.7-10 Operation mode at " Automatic operation "

1 Previous Note 2. " Monitoring 1 " measures the room temperature ( TR ) and if it is " Set temperature TS +2 or less, " Heating " is decided and " Refrigerant circulation " is started.

2 When TS -2 < TR < TS+2 at 1 , " Monitoring 2 " " Room fan motor " continues and monitoring of the room temperature continues until " Cooling " or " Heating " operation is decided.

3 When " Heating " or " Cooling " is decided, the respective operation is performed in accordance with " Room temperature control " to be described later.

4 When " Refrigerant circulation stopped " by " Cooling " or " Heating " "Room temperature adjustment " continues for 6 minutes or more, the room temperature monitoring of 2 above is performed.

5 In the state of room temperature watching stated in the above 4 , the indoor unit fan motor shall be S-LO.

6 When " Set temperature " was changed.

A) When changed during " Monitoring 1 ", judgment if performed by means of the " Set temperature " newly input after the end of " Monitoring 1 ".

B) When changed with in the previously mentioned Note 3 monitoring range, the newly input " Set temperature " is made TS.

C) When changed during " Cooling operation in progress " ( including " Refrigerant circulation stopped " for under 6 minutes by " Room temperature adjustment " ) after " Cooling operation " decision, " Cooling operation " is continued with the newly input " Set temperature " as TS.

D) When changed during " Heating operation in progress " ( including " Refrigerant circulation stopped " for under 6 minutes by " Room temperature adjustment ") after " Heating operation " decision, " Heating operation " is continued with the newly input " Set temperature " as TS.

7 After entering the room temperature monitoring state after the " Refrigerant circulation state " by " Room temperature adjustment " has continued for 6 minutes, " Cooling Heating switching is performed even when in a temperature state which switches " Cooling Heating " by "Set temperature " change.

– 67 –

Page 68

(1) When starting the operation at “AUT

O” or when switched to “AUTO” from other modes, if the room temperature is higher than the set temperature +2 C (Room temp. Set temp. (Ts) +2 C), “COOL” mode is set automatically and an air conditioner operates until the room temperature reaches the condition “Room temp. Set temp. (Ts) +1 C”.

(2) When the room temperature is less than

the set temperature (Ts) +2 C at the start of operation or changing into “AUTO”, or after the room temperature reaches the condition “Room temp. Set temp. (Ts) +2 C”, the unit is changed into the “DRY” mode.

“Room Temp. Set Temp. (Ts) +2 C”

Yes

Room temp. control

• 3-min. ST Protection

• Room temperature control

Operation flow chart

START

Room temp.

Ts+2 C ?

Room temp.

Ts+1 C ?

Room temp.

Ts+2 C ?

COOLING OPERATION

DRY OPERATION

Yes

Cool

Ts+2 C

Ts C

Dry

AUTO CHANGEOVER operation (COOLING ONLY TYPE )

Refrigerant circulation stopped?

– 68 –

Page 69

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

• Set temperature (Ts=Tα Correction)

• Compressor

• Indoor fan

ON OFF

Tα+0.5 C

(b)

(C)

3~6 min.

3ST

3HT 3HT 3HT 3HT

Less than 6 min.

TIME

(b)

(a)

Tα

(1) When using the cooling mode, set the temperature to a value lower than the current room temperature. (2) If it is set higher than the current room temperature the unit will not enter the cooling mode and only the fan will oper-

ate.

(a) Compressor turned OFF : TR Tα (b) Compressor turned ON : TR Tα+0.5 C (In case of 3 to 6 minutes) (c) Compressor turned ON : TR Tα (In case that the compressor stops more than 6 minutes)

6-3-3 “COOL” POSITION

6-3-4 “HEAT” POSITION

(1) Set the temperature higher than the current room temperature. If it is set to a lower temperature, heating will not

start.

(2) For about 3 ~ 5 minutes after the start of heating, the fan will operate very slowly, and then switch to the selected fan

setting. This period allows the indoor unit’s heat exchanger to warm-up before emitting warm air.

(3)

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

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

• Set temperature (Ts=Tβ Correction)

• Compressor

• Indoor fan

• speed mode

Tβ+0.5 C

Tβ C

27 C

ON OFF

SET S-LOW OFF

(a)

(b)

3ST

20sec.

Cold air prevention

(a) Compressor OFF : TR Tβ+0.5 C (b) Compressor ON : TR Tβ (c) Compressor ON : TR Tβ+0.5 C (When the compressor stops after less than 6min.)

3~6 min.

3HT

20sec. 20sec.

(C)

Less than 6 min.

3HT

20sec.

– 69 –

Page 70

6-3-5 “FAN” POSITION

(1) In this position, the fan operates alone to circulate air. The room temperature will not be changed. (2) Operates at the air flow set in the FAN CONTROL mode. (3) When only the “FAN” mode is being used, setting to “AUTO” is equivalent to set it at “MED”.

– 70 –

Page 71

DANGER!

6-4 LOUVER CONTROL

(1) ADJUSTING THE DIRECTION OF AIR CIRCULATION

Instructions relating to heating (∗) are applicable only to "HEAT & COOL MODEL" (Reverse Cycle).

Begin air conditioner operation before performing this procedure.

Vertical Air Direction Adjustment

This instructions are applicable to "CEILING SUSPENSION TYPE", "FLOOR CONSOLE/UNDER CEILING DUAL TYPE" "CASSETTE TYPE", and "WALL MOUNTED TYPE".

Press the VERTICAL AIR FLOW DIRECTION SET button.

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

1 2 3 4

The remote controller's display does not change.

■ CEILING SUSPENSION TYPE

■ FLOOR CONSOLE/UNDER CEILING DUAL TYPE

TIMER MODE

CLOCK ADJUST

SET TIME

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

MASTER CONTROL

START/STOP

Example : When set to vertical air direction.

Never place fingers or foreign objects inside the outlet port could cause personal injury.

Always use the remote controller's AIR FLOW DIRECTION button to adjust the UP/DOWN air direction flap or RIGHT/ LEFT air direction louvers. Attempting to move them manually could result in improper operation; in this case, stop operation and restart. The flaps should begin to operate properly again. During use of the Cooling mode, do not set the UP/DOWN air direction flap in the 4 position for 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.

■ CASSETTE TYPE

■ WALL MOUNTED TYPE

– 71 –

Page 72

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.

Horizontal Air Direction Adjustment

This instructions are applicable to "CEILING SUSPENSION TYPE", "FLOOR CONSOLE/UNDER CEILING DUAL TYPE" and "WALL MOUNTED TYPE".

Press the HORIZONTAL AIR FLOW DIRECTION SET button.

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

1 2 3 4 5

The remote controller's display does not change.

■ CEILING SUSPENSION TYPE

TIMER MODE

CLOCK ADJUST

SET TIME

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

MASTER

CONTROL

START/STOP

Example : When set to horizontal air direction.

■ FLOOR CONSOLE/UNDER CEILING DUAL TYPE

■ WALL MOUNTED TYPE

(2) SWING OPERATION

Instructions relating to "the indoor unit's indicator lamp" (∗∗) are applicable to "CEILING SUSPENSION TYPE", "FLOOR CONSOLE /UNDER CEILING DUAL TYPE", "CASSETTE TYPE", "WALL MOUNTED TYPE".

Begin air conditioner operation before performing this procedure.

To select Vertical airflow SWING Operation

This instructions are applicable to "CEILING SUSPENSION TYPE", "FLOOR CONSOLE/UNDER CEILING DUAL TYPE", "CASSETTE TYPE" and "WALL MOUNTED TYPE".

– 72 –

Page 73

Air flow direction set

Range of swing

to to to

to (All range)

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.

To Stop Vertical airflow SWING Operation

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

Instructions relating to "the indoor unit's indicator lamp" (**) are applicable to "CEILING SUSPENSION TYPE", "FLOOR CONSOLE /UNDER CEILING DUAL TYPE", "CASSETTE TYPE" and "WALL MOUNTED TYPE".

TIMER

MODE

CLOCK ADJUST

SET TIME

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

MASTER

CONTROL

START/STOP

Example : When set to vertical swing.

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.

During use of the Cooling mode, do not set the air UP/ DOWN direction flap, in the position for long periods of time, since

4 water vapor may condense near the outlet port and drops of water may drip from the air conditioner.

To select Horizontal Airflow SWING Operation

This instructions are applicable to "CEILING SUSPENSION TYPE", "FLOOR CONSOLE/UNDER CEILING DUAL TYPE" and "WALL MOUNTED 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.

1 2 3 4

1 2 2

1 4

Air direction range (See page 22)

TIMER MODE

CLOCK ADJUST

SET TIME

TEMP./DAY

ZONE

SET

FAN

CONTROL

ENERGY SAVE

DAY OFF

MASTER

CONTROL

START/STOP

Example : When set to horizontal swing.

3 4 4

To Stop Horizontal airflow SWING Operation

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

About Horizontal 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 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 speeds.

– 73 –

Air flow direction set

1 5

Air direction range (See page 23)

Range of swing

to (All range)

Page 74

6-5 ELECTRONIC EXPANSION VALVE CONTROL

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.

6-6 AUTO RESTART

(1) The air conditioner restarts with the previous setting operation. (2) 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.

(4) When the timer power is interrupted during operation and is reset later, the timer display flashes ( on 3 sec. / off 1 sec.).

6-7 DRAIN PUMP OPERATION

(1) When 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 refrigerant circulation stops by the 'Indoor heat exchanger de-icing function', the drain pump is turned off

in 1 hour after the compressor stops.

(4) When the water level in the drain pan rises up and then the float switch functions:

Microcomputer stops the refrigerant circulation and indoor and outdoor 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 min., 'FAILURE INDICATION' operates. (6) When the float switch turns OFF within 3 min., the unit starts cooling operation.

– 74 –

Page 75

7. WIRING DIAGRAMS

7-1 UNIVERSAL FLOOR / CEILING TYPE

MODELS : AB12, AB14, AB18, AB24

– 75 –

For Heat Recovery only

RB UNIT

Page 76

7-2 LARGE CEILING TYPE

MODELS : AB30, AB36, AB45, AB54

For Heat Recovery only

RB UNIT

– 76 –

Page 77

7-3 COMPACT DUCT TYPE

MODELS : AR7, AR9, AR12, AR14,AR18

For Heat Recovery only

RB UNIT

– 77 –

Page 78

7-4 LOW STATIC PRESSURE DUCT TYPE

MODELS : AR25, AR30, AR36, AR45

For Heat Recovery only

RB UNIT

– 78 –

Page 79

7-5 HIGH STATIC PRESSURE DUCT TYPE

MODELS : AR36H, AR45H, AR60H

For Heat Recovery only

RB UNIT

– 79 –

Page 80

7-6 COMPACT CASSETTE TYPE

MODELS : AU7, AU9, AU12,AU14,AU18

For Heat Recovery only

RB UNIT

– 80 –

Page 81

7-7 NEW CASSETTE TYPE

MODELS : AU20, AU25, AU30,AU36,AU45,AU54

For Heat Recovery only

RB UNIT

– 81 –

Page 82

7-8 WALL MOUNTED TYPE

MODELS :

AS14 , 20 , 24 , 30

– 82 –

Page 83

7-9 OUTDOOR UNIT

MODEL : AOY90

– 83 –

Page 84

8. TROUBLESHOOTING

8-1 INDOOR UNIT

SWING LAMP (Orange) TIMER LAMP (Green) OPERATION LAMP (Red)

MANUAL

SWING

TIMER

OPERATION

Operation can be checked by lighting and flashing of the grille display section OPERATION and TIMER lamps. perform judgment in accordance with the following.

Test running

When the air conditioner is run by pressing the remote controller test run button, the OPERATION and TIMER lamps flash slowly at the same time.

Error

The OPERATION and TIMER lamps operate as follows (Table 11) according to the error contents.

AUTO

8-1-1 NORMAL OPERATION DISPLAY

OPERATION FACTOR INDICATOR LAMP FLASH / TIME (SEC)

1.0 sec 1.0 sec

3.0 sec 1.0 sec

1.0 sec 1.0 sec

3.0 sec 1.0 sec

Test operation

Power failure *1 Auto-restart enable (DIP SW 2-4 : OFF)

*2 Auto-restart disable (DIP SW 2-4 : ON)

Defrost operation *3 (Heating operation)

Operation lamp (red)

Timer lamp (green)

Operation lamp (red)

Timer lamp (green)

Operation lamp (red)

ON OFF

Note: Display lamps light on the front panel of the indoor unit.

*1: The power is failed during timer operation, then the timer lamp flashes on and off when the power returns. *2: The power is failed during operation, then both lamps flash on and off when the power returns. *3: While the indoor fan motor stops, the operation lamp flashes on and off.

– 84 –

Ð 38Ð

Page 85

8-1-2 ABNORMAL OPERATION DISPLAY

Operation Lamp Timer Lamp Swing Lamp

0.1 sec. ON / OFF flashing

0.5 sec. / 0.5 sec. flashing 2 times

0.5 sec. / 0.5 sec. flashing 3 times

0.5 sec. / 0.5 sec. flashing 4 times

0.5 sec. / 0.5 sec. flashing 5 times

0.5 sec. / 0.5 sec. flashing 6 times

0.1 sec. ON / OFF flashing 7 times

0.1 sec.ON/ OFF 0.5 sec. ON / OFF

0.1 sec. ON / OFF flashing

Model data error PCB fault. Room temperature thermister error. Thermister(CN19) open or short-circuited. Indoor heat exchanger inlet temperature thermistor error.

Heat exchanger inlet thermister(CN20 1,2PIN) open or short-circuited.

Indoor heat exchanger intermediate temperature thermistor error. Heat exchanger inlet thermister(CN20 3,4PIN) open or short-circuited.

Indoor heat exchanger outlet temperature thermistor error.

Heat exchanger outlet thermister(CN20 5,6PIN) open or short-circuited

Drain error (Float switch operation) The float switch operates and if there is no recovery within 3 minutes. Inside of the hose stuffed, drain pump/float switch and PCB fault.

(When float switch is turned to ON, the compressor and the indoor fan stopped)

Serial communication error (between air conditioner unit and wired remote controller) PCB fault. Indoor fan error.

AB30-54: Indoor fan motor line(CN 4) or feedback line (CN 16) is disconnected/bad connected, PCB and indoor fan motor fault.

* When the indoor fan motor rotation is differ from the required rotation on the indoor fan phase control model(AB30-54), the in-

door fan becomes faulty due to the rotation does not feedback.

Discharge temperature thermistor error. Discharge thermistor (CN 21) open or short-circuited. Doubled indoor address and excessive connecting units.

Indoor unit address is doubled or units to be connected are excessive. Outdoor unit error. Outdoor unit faulty.

0.1 sec. ON / OFF flashing

flashing 2 times

0.5 sec. ON / OFF flashing 3 times

0.5 sec. / 0.5 sec. flashing once

0.5 sec. / 0.5 sec. flashing 2 times

0.5 sec. / 0.5 sec. flashing 3 times

0.5 sec. ON / OFF flashing 2 times

0.5 sec. ON / OFF flashing 3 times

Model data error

Room temperature thermistor error

Heat exchanger inlet temperature thermistor error

Heat exchanger intermediate temperature thermistor error

Heat exchanger outlet temperature thermistor error

Drain error(Float switch operation) Serial communication error

Indoor fan error

Discharge temperature thermistor error

Dduplicate indoor unit numbers,Number of indoor units exeeds limit

Outdoor unit error

Error contents

– 85 –

Page 86

Table 11

OPERATION LAMP

TIMER LAMP

SWING LAMP

OPERATION

LAMP

TIMER LAMP

SWING LAMP

OPERATION LAMP

TIMER LAMP

SWING LAMP

Error display

0.1 sec

0.5 sec 5 sec

0.5 sec

0.1 sec

0.5 sec

0.1 sec

0.5 sec

5 sec

0.1 sec ON/OFF repeated

0.1 sec

ON/OFF repeated

Two quick flashes

repeated

0.1 sec ON/OFF

repeated

Three quick flashes

repeated

0.1 sec

ON/OFF

repeated

One quick flashes

repeated

Error contents

Model data error

Room temperature thermistor

error

Indoor heat exchanger inlet tempe-

rature ther-

mistor error

OPERATION

LAMP

TIMER LAMP

SWING LAMP

OPERATION

LAMP

TIMER LAMP

SWING

LAMP

OPERATION LAMP

TIMER LAMP

SWING LAMP

Error display

0.5 sec 0.5 sec

0.1 sec

0.5 sec

0.1 sec

0.5 sec

0.1 sec

5 sec

0.5 sec

5 sec

Four quick

flashes

repeated

0.1 sec ON/OFF

repeated

Five quick flashes repeated

0.1 sec ON/OFF repeated

Six quick

flashes repeated

0.1 sec ON/OFF

repeated

Error contents

Drain error (Float switch operation) The float switch operates and if there is no recovery within 3 minutes.

Serial communication error (between air conditioner unit and wired remote controller)

Indoor fan error

OPERATION

LAMP

TIMER

LAMP

SWING LAMP

OPERATION

LAMP

TIMER LAMP

SWING

LAMP

0.5 sec

0.1 sec

0.5 sec

0.1 sec 0.5 sec

0.1 sec

0.5 sec

5 sec

0.5 sec0.1 sec

0.5 sec

5 sec

0.5 sec

Three quick

flashes

repeated

0.1 sec ON/OFF repeated

Two quick

flashes

repeated

Three quick flashes repeated

0.1 sec ON/OFF

repeated

Three quick flashes repeated

Indoor heat

exchanger intermediate temperature thermistor error

Indoor heat

exchanger

outlet tem-

perature

thermistor

error

OPERATION

LAMP

TIMER LAMP

SWING LAMP

OPERATION

LAMP

TIMER

LAMP

SWING LAMP

0.5 sec

0.1 sec

0.5 sec

5 sec

0.5 sec

Seven quick

flashes repeated

0.1 sec ON/OFF

repeated

0.1 sec ON/OFF

repeated

Two quick

flashes repeated

Two quick flashes repeated

Discharge

temperature

thermistor error

Duplicate indoor unit numbers, Nunber of indoor units exceeds limit

– 86 –

Page 87

OPERATION

LAMP

TIMER LAMP

Error display

0.1 sec

0.5 sec 0.5 sec

0.1 sec

ON/OFF

repeated

Three quick

flashes

repeated

Error contents

Outdoor unit error

SWING LAMP

5 sec

Three quick

flashes

repeated

– 87 –

Page 88

8-2 OUTDOOR UNIT

8-2-1 NORMAL OPERATING DISPLAY

Display Type

Cooling operation He

ating operation Cooling main operation Heating main operation Same performance operation

Compressor output STEP1 Compressor output STEP2 Compressor output STEP3 Compressor output STEP4 Compressor output STEP5 Compressor output STEP6

Heat exchanger usage ca Heat exchanger Heat

exchanger

Heat

exchanger usage capacity STEP4

usage

pacity STEP1

capacit

y STEP2

capacity STEP3

Heat exchanger usage capacity STEP5 Heat exchanger usage capacity STEP6

Oil recovery Defrosting Test operation

High pressure Medium pressure by-pass High pressure

Low pressure by-pass

Under initialization of expansion valve

LED 1

LED 2

(1)

(2)

(3)

(4) (5)

LED 3

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

LED 4

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

LED 5

(1) (2) (3)

LED 6

(1) (2)

Display Method

Error display

LED 1

OFF

LED 2-6

0.5SEC

: Lighted continuously

: 0.5sec ON/0.5sec OFF fl

: Flashing times

( )

0.5SEC

5SEC

ashing

OUTDOOR P.C.B. BOARD LAYOUTS

LED 4 LED 5

LED 6

LED 1 LED 2 LED 3

OFF

– 88 –

0005HUE C

Page 89

8-2-2 ABNORMAL OPERATION DISPLAY

Display type

Compressor1 error

Compressor2 error

Compressor3 error

Discharge temprature1 error Discharge temprature2 error Discharge temprature3 error High-pressure error Low-pressure error Pump down error

Discharge temperature thermistor1 error Discharge temperature thermistor2 error Discharge temperature thermistor3 error

Heat exchange inlet thermistor1 error Heat exchange inlet thermistor2 error

Heat exchange inlet thermistor3 error Heat exchange outlet thermistor1 error Heat exchange outlet thermistor2 error Heat exchange outlet thermistor3 error Suction thermistor error Outdoor thermistor error

Discharge pressure sensor error Liquid line pressure sensor error Suction pressure sensor error

Oil sensor error

Oil recovery error

Reverse phase blocker error

Power frequency faulty

Model data error

EEPROM access error

EEPROM deletion error

Outdoor unit circuit bord error 1 Outdoor unit circuit bord error 2 Outdoor unit circuit bord error 2

Communication error

Node setting error

Indoor unit error

Display method

Error display

0.1SEC

LED 1

OFF

0.1SEC

0.3SEC

LED 1

LED 2

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

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

{

: Flashing times

( )

5SEC

0.3SEC

LED 3 LED 4

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

(1) (2) (3) (4) (7)

LED 5

(1)

(2)

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

(8)

(9)

0.1 SEC ON/OFF repeated

LED 6

(1)

LED 2-6

OFF

– 89 –

Page 90

8-3 REMOTE CONTROL UNIT

CLOCK

NON STOP

COOL

Error Code

TIMER MODE

CLOCK ADJUST

SET TIME

TEMP./DAY

ZONE

SET

FAN

CONTROL

START/STOP

ENERGY SAVE

DAY OFF

MASTER

When EE : EE blinks at the current time display, there is an error inside the air conditioner. If the SET TIME button ( ) and SET TEMP./DAY button ( ) are pressed simultaneously for more than three seconds, the self diagnosis check will start and the error contents will be displayed at the current time display. In addition, the remote controller address will be displayed at the current time display. In addition, the remote controller address will be displayed below. When the operation lamp lights, press the START/STOP button and after operation lamp goes off, perform the same operation.

SET TIME

TIMER MODE

CLOCK ADJUST

Error Code

ZONE

SET

FAN

CONTROL

START/STOP

ENERGY SAVE

DAY OFF

MASTER

TEMP./DAY

Error contents

No error

Model data abnormal

Power supply frequency error

EEPROM access error

EEPROM deletion error

Room temperature themistor error

Indoor unit heat exchanger themistor

(middle) error

Indoor unit heat exchanger themistor (inlet) error

Indoor unit heat exchanger themistor

(outlet) error

Blower tempearture themistor error

Drain abnormal

Room tempearture abnormal

Indoor unit fan error

Transmission error

Node setting error

Parallel communication error

Outdoor unit error

– 90 –

Page 91

8-4 ERROR CODE & TROUBLESHOOTING

INDOOR UNIT TROUBLESHOOTING

ERROR

CODE

00 No errors

ERROR

CONTENTS

ERROR CAUSE

REMEDY

Model

03 Microcomputer

data error

error

1. Generation condition Error in

memorized in EEPROM when

power turned on.

2. Corresponding operation.

1) Relevant indoor unit stopped (not started).

2) Error display to indoor unit LED and error output to communication bus line. 3, Reset condition. 

Model information memorized in EEPROM restored to normal.

1. Generation condition. Communication between two

microcomputers on indoor unit control PC

board not performed normally.

2. Corresponding operation.

Relevant indoor unit stopped

(not started).

2) Error display to indoor unit LED and error output to communication bus line.

3. Reset condition Normal microcomputers communication restored.

model information

Model information not memorized or erased for some reason.

1. Effect of extraneous noise.

2. Indoor unit control PC board faulty.

Replace indoor unit control PC board.

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

1) If error not generated again, PC board is normal. Therefore, remove noise sources near indoor unit.

2) If error generated again, perform the following, in addition to removing noise

sources.

2. Replace indoor unit control PC board.

Power line frequency abnormal

EEPROM access error

1. Generation condition Indoor unit control PC board

detected frequency outside operating.

2. Corresponding operation.

1) Relevant indoor unit

stopped (not started).

2) Error display to indoor unit

LED and error output to communication bus line

3. Reset operation. Indoor unit control PC board

detects rated frequency.

1. Generation condition

After indoor unit started, EEPROM cannot be accessed because of

disturbance or element error.

2. Corresponding operation

Error display to indoor unit LED.

3. Reset operation

Normal access to EEPROM restored.

Power line frequency is below 45Hz or above 65Hz.

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

Check power line frequency and supply rated frequency.

1. Remove noise sources near indoor unit.

2. Replace indoor unit control PC board.

– 91 –

Page 92

ERROR

CODE

ERROR

EEPROM deletion error

CONTENTS

1. Generation condition. Error in model information

memorized at EEPROM after

indoor unit started.

2. Corresponding operation.

Relevant indoor unit stopped

2) Error display to indoor unit LED.

3. Reset condition Model information memorized at EEPROM restored to normal.

ERROR CAUSE

Model information not memorized, or erased for some reason.

REMEDY

Replace indoor unit control PC board.

09 Room tempera-

ture thermistor error

0A Indoor unit heat

exchanger thermistor error (middle)error

0B Indoor unit heat

exchanger thermistor(inlet)error

0C Indoor unit heat

exchanger thermistor(outlet) error

1. Generation condition. Thermistor short or open detected.

2. Corresponding operation. Indoor unit stopped, error display to indoor unit LED, and error output to communication bus line.

3. Reset condition. Thermistor detection value other than short or open.

1. Generation condition. Thermistor short or open detected.

2. Corresponding operation. Indoor unit stopped, error display to indoor unit LED, and error output to communication bus line.

3. Reset condition. Thermistor detection value other than short or open.

1. Generation condition. Thermistor short or open detected.

2. Corresponding operation. Error display to indoor unit LED.

3. Reset condition. Thermistor detection value other than short or open.

1. Generation condition. Thermistor short or open detected.

2. Corresponding operation. Error display to indoor unit LED.

3. Reset condition. Thermistor detection value other than short or open.

1. Connector connection faulty.

2.Temperature thermistor faulty.

1. Connector connection faulty.

Heat exchanger thermistor

(middle) faulty.

1. Connector connection faulty.

Heat exchanger thermistor

(inlet)faulty.

1. Connector connection faulty.

2. Heat exchanger thermistor (outlet)faulty.

Check for loose or dislodged thermistor

connector.

2. Check temperature thermistor resistance. If abnormal, replace thermistor.

1. Check for loose or dislodged heat exchanger thermistor(middle) connector.

2. Check resistance of heat exchanger thermistor(middle). If abnormal, replace thermistor.

1. Check for loose or dislodged heat exchanger thermistor(inlet) connector.

2. Check resistance of heat exchanger thermistor(inlet). If abnormal, replace thermistor.

1. Check for loose or dislodged heat exchanger thermistor(outlet) connector.

2. Check resistance of heat exchanger thermistor(outlet). If abnormal, replace thermistor.

– 92 –

Page 93

ERROR

CODE

ERROR

Blower temperature thermistor error

CONTENTS

1. Generation condition Thermistor short or open detected.

2. Corresponding operation Indoor unit stopped, error display to indoor unit LED, and error output to communication bus line.

3. Reset condition Thermistor detection value other than short or open.

ERROR CAUSE

1. Connector connection faulty.

2. Blower

temperature thermistor

faulty.

REMEDY

Check for loose or dislodged blower

temperature thermistor connector.

2. Check resistance of

thermistor. If abnormal, replace thermistor.

blower temperature

11 Drain abnormal

Room temperature thermistor error

Indoor unit fan

error

Communication

error (indoor unitremote controller)

1. Generation condition Float SW ON continuously for 3 minutes.

2. Corresponding operation Indoor unit stopped, error display to indoor unit LED, and error output to communication bus line.

3. Reset condition Float SW turned OFF.

1. Generation condition Room temperature thermistor detected temperature exceeds 60 C continuously for 30 minutes or longer during indoor unit operation.

2. Corresponding operation Indoor unit stopped, error display to indoor unit LED, and error output to communication bus line.

3. Reset condition Reset by turning power off and on again.

1. Generation condition Fan speed feedback by large

type ceiling model (AB30 or above) +/-400rpm or greater relative to target speed.

2. Corresponding operation

Indoor fan stopped, error display to indoor unit LED, error output to communication bus line.

3. Reset condition

Reset by turning power off.

1. Generation condition Communication impossible

between standard wired remote

controller and indoor unit.

2. Corresponding operation Error display to indoor unit LED.

3. Reset condition

Standard wired remote controller communication restored.

1. Drain hose clogged.

2. Drain outlet clogged.

3. Drain pump faulty.

4. Float SW operation faulty (short)

1. Connector connection faulty.

2. Room temperature thermistor faulty.

1. Indoor fan motor lead wire connection faulty.

2. Power line voltage abnormal.

1. Communication line not connected, connector faulty, or line open.

2. Indoor unit control PC board faulty.

3. Standard wired remote controller PC board faulty.

1. Clean drain hose.

2. Clean drain outlet.

3. Check drain pump operation. If faulty, replace pump.

4. When float SW shorted, replace SW.

1. Check for loose or dislodged room temperature connector.

2. Check resistance of room temperature thermistor. If abnormal, replace thermistor.

1. Check indoor fan motor lead wire wiring.

2. Check if rated power line voltage supplied.

1. Check if communication line connected to each indoor unit. Check for communication line open and loose connection.

2. Replace indoor unit control PC board.

3. Replace standard wired remote controller PC board.

– 93 –

Page 94

ERROR

CODE

ERROR

Transmission error

CONTENTS

1. Generation condition.

Communication between indoor unit and outdoor unit exceeds certain time.

2. Corresponding operation.

Current operation continued, error display to standard wired remote controller, and display to indoor unit LED.

3. Reset condition.

Communication between indoor unit and outdoor unit restored.

ERROR CAUSE

1. Effect of extraneous noise.

2. Communication line not connected, connection faulty, or line open.

Indoor unit communication PC board or outdoor unit communication PC board insertion faulty.

REMEDY

1. When power turned OFF, then turned back ON: (1) If error not generated again, PC board is normal. Therefore, remove noise sources near outdoor unit. (2) If error generated again, check following, in addition to removing noise sources.

Check if communication line connected to each indoor unit. Check for open communication line and loose wiring.

3. Check insertion of indoor unit communication PC board and outdoor unit communication PC board.

20 Node setting

error

1. Generation condition. Indoor unit communication PC board not initialized normally.

2. Corresponding operation. Error display to standard wired remote controller and display to indoor unit LED.

3. Reset condition. Indoor unit communication

PC board initialized normally.

4. PC board faulty.

1. Effect of extraneous noise.

2. PC board faulty.

4. (1) If communication with some indoor units in same refrigerant system is abnormal and compressor operates,

replace PC boards in following order and check operation: 1 Indoor unit communication PC board 2 Indoor unit control PC board (2) If communication with all indoor units in same refrigerant system is abnormal and compressor does not operate, replace PC boards in following order and check operation: 1

Outdoor unit communication PC board. 2 Outdoor unit control PC board. 3 Indoor unit communication PC board. 4 Indoor unit control PC board.

1. When power turned off, then turned back on: (1) If error not generated again, PC board is normal. Therefore, remove noise sources near indoor unit. (2) If error generated again, check

following, in addition to removing noise sources.

1. Replace PC boards in following order, and check operation. (1) Indoor unit communication PC board. (2) Indoor unit control PC board.

– 94 –

Page 95

ERROR

CODE

ERROR

21 Parallel commu-

nication error

Outdoor unit error

CONTENTS

1. Generation condition. Communication between indoor unit control PC board and indoor unit communication PC board not performed normally.

2. Corresponding operation.

1) Current operation continued, error display to standard wired remote controller, and display to indoor unit LED.

2) If error continues for 90 seconds after generation, a new transmission error (1F) is output.

3. Reset condition. Normal communication restored between indoor unit control PC and indoor unit communication PC board.

Error generated at outdoor unit in same refrigerant system.

ERROR CAUSE

1. Effect of extraneous noise.

2. Indoor unit communication board insertion faulty.

3. PC board faulty.

REMEDY

1. When power turned off, then turned back on:

1) If error not generated again, PC board is normal. Therefore, remove noise sources near indoor unit.

2) If error generated again, check following, in addition to removing noise sources.

2. Check indoor communication PC board insertion.

3. Replace PC boards in following order, and check operation. (1) Indoor unit communication PC board. (2) Indoor unit control PC board.

See "Outdoor unit troubleshooting".Outdoor unit faulty.

– 95 –

Page 96

OUTDOOR UNIT TROUBLESHOOTING

ERROR

CODE

00 No errors 02

ERROR

Model data error

Communication error

Power frequency faulty

CONTENTS

1. Generation condition. When power turned on, there

was an error in model information memorized in EEPROM.

2. Corresponding operation.

1) All compressors stopped

(not started).

2) Error display to outdoor unit

LED and error output to communication bus line.

3. Reset condition.

Model information memorized in EEPROM restored to normal.

1. Generation condition. Communication between two microcomputers on outdoor unit control PC board not performed normally.

1) All compressors stopped (not started).

2) Error display to outdoor unit LED and error output to communication bus line.

3. Reset condition. Normal microcomputers communication restored.

1. Generation condition. Outdoor unit control PC board detected frequency outside of rating.

2. Corresponding operation.

1) All compressors stopped (not started).

2) Error display to outdoor unit LED and error output to communication bus line.

3. Reset condition. Outdoor unit control PC board

detects rated frequency.

ERROR CAUSE

Model information not memorized, or erased for some reason.

1. Effect of extraneous noise.

Outdoor unit control PC board

faulty.

Power line frequency below 45Hz or above 65Hz.

REMEDY

Replace outdoor unit control PC board.

1. When power turned off, then turned back on:

1) If error not generated again, PC board is normal. Therefore, remove noise sources near outdoor unit.

2) If error generated again, perform following, in addition to removing noise sources.

Replace outdoor unit control PC board.

Check power line frequency and supply correct frequency.

Reverse phase

blocker error

1. Generation condition. Reverse phase prevention circuit detected reverse phase input or when the

normal input was not detected.

2. Corresponding operation.

1) All compressors stopped.

2) Error display to outdoor unit LED and error output to communication bus line.

3. Reset condition. Reverse phase prevention circuit no longer detects reverse phase input.

1. Reverse phase wiring.

2. Reverse phase prevention circuit faulty.

– 96 –

1. Check power supply wiring.

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

Page 97

ERROR

CODE

ERROR

EEPROM access error

CONTENTS

1. Generation condition. After outdoor unit started,

EEPROM cannot be accessed because of

disturbance or element error.

2. Corresponding operation. Error display to outdoor unit LED.*Restriction on outdoor unit not performed.

3. Reset condition. EEPROM accessed normally.

ERROR CAUSE

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

REMEDY

1. Remove noise sources near outdoor unit.

Replace outdoor unit control PC board.

07 EEPROM

deletion error

Compressor 1

error

1. Generation condition. After outdoor unit started, there was an error in model information memorized in EEPROM.

2. Corresponding operation.

1) All compressors stopped.

2) Error display to outdoor unit LED.

3. Reset condition. Model information memorized

in EEPROM restored to normal.

1. Generation condition. Thirty minutes after compressor 1 started, discharge temperature 1 does not reach outdoor temperature plus 10 C.

2. Corresponding operation.

1) After compressor error, compressor recovery operation performed. However, for defrosting control and oil recovery operation, compressor recovery operation is not performed.

2) Error display to outdoor unit LED and error output to communication bus line.

3. Reset condition. When 2 hours have elapsed after error generation. *Counting of 2-hour counter begins from state in which error occurred at one or

more of three compressors. Error reset by turning power off.

Model information not memorized, or erased for some reason.

Discharge temperature sensor

THD1 faulty.

2. Compressor power relay 1 faulty.

3. Outdoor unit control PC board faulty.

4. Magnetic contactor 1 faulty.

5. Refrigerant level low.

6. After 2 hours 30 minutes have elapsed since error was displayed, error detection is performed again and error is not displayed.

7. Compressor motor protector operated.

8. Compressor faulty.

Replace outdoor unit control PC board.

Check for loose or dislodged discharge

temperature sensor THD1 sensor wiring and check sensor resistance. If abnormal, replace sensor.

2. Check compressor power relay 1. If abnormal, replace power relay.

3. Check CN32 (compressor 1) 12V voltage output on outdoor unit control PC board. If abnormal, replace PC board.

4. Check magnetic contactor 1. If 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 reset at 61 C +/-9 C.

8. Check compressor. If faulty, replace compressor.

– 97 –

Page 98

ERROR

CODE

ERROR

Compressor 2 error

CONTENTS

1. Generation condition. Thirty minutes after compressor 2 started, discharge temperature 2 does not reach outdoor temperature plus 10 C.

2. Corresponding operation.

1) After compressor error, compressor recovery operation performed. However, for defrosting control and oil recovery operation, compressor recovery operation is not performed.

2) Error display to outdoor unit LED and error output to communication bus line.

3. Reset condition. When 2 hours have elapsed after error generation. *Counting of 2-hour counter begins from state in which error occurred at one or more of three compressors.

Error reset by turning power

off.

ERROR CAUSE

Discharge temperature sensor

THD2 faulty.

2. Compressor power relay 2 faulty.

3. Outdoor unit control PC board faulty.

4. Magnetic contactor 2 faulty.

5. Refrigerant level low.

6. After 2 hours 30 minutes have elapsed since error was displayed, error detection is performed again and error is not displayed.

7. Compressor motor protector operated.

8. Compressor faulty.

REMEDY

Check for loose or dislodged discharge

temperature sensor THD2 sensor wiring and check sensor resistance. If abnormal, replace sensor.

2. Check compressor power relay 2. If abnormal, replace power relay.

3. Check CN33 (compressor 2) 12V voltage output on outdoor unit control PC board. If abnormal, replace PC board.

4. Check magnetic contactor 2. If 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 reset at 61 C +/-9 C.

8. Check compressor. If faulty, replace compressor.

Compressor 3 error

1. Generation condition. Thirty minutes after compressor 3 started, discharge temperature 3 does not reach outdoor temperature plus 10 C.

2. Corresponding operation.

1) After compressor error, compressor recovery operation performed. However, for defrosting control and oil recovery operation, compressor recovery operation is not performed.

2) Error display to outdoor unit LED and error output to communication bus line.

3. Reset condition. When 2 hours have elapsed after error generation. *Counting of 2-hour counter begins from state in which

Error occurred at one or more of three compressors. Error reset by turning power off.

Discharge temperature sensor

THD3 faulty.

2. Compressor power relay 3 faulty.

3. Outdoor unit control PC board faulty.

4. Magnetic contactor 3 faulty.

5. Refrigerant level low.

6. After 2 hours 30 minutes have elapsed since error was displayed, error detection is performed again and error is not displayed.

7. Compressor motor protector operated.

8. Compressor faulty.

Check for loose or dislodged discharge

temperature sensor THD3 sensor wiring and check sensor resistance. If abnormal, replace sensor.

2. Check compressor power relay 3. If abnormal, replace power relay.

3. Check CN34 (compressor 3) 12V voltage output on outdoor unit control PC board. If abnormal, replace PC board.

4. Check magnetic contactor 3. If 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 reset at 61 C +/-9 C.

8. Check compressor. If faulty, replace compressor.

– 98 –

Page 99

ERROR

CODE

ERROR

Discharge temperature thermistor 1 error

Discharge temperature thermistor 2 error

CONTENTS

1. Generation condition. Thermistor short or open

detected.

2. Corresponding operation.

1) Compressor 1 stop.

2) Error display to outdoor unit LED and error output to communication bus line.

3. Reset condition. Thermistor detection value

other than short or open. * Compressor continues to operate for 5 minutes or longer and detection is performed during operation.

1. Generation condition. Thermistor short or open

detected.

2. Corresponding operation.

1) Compressor 2 stop.

2) Error display to outdoor unit LED and error output to communication bus line.

3. Reset condition. Thermistor detection value

other than short or open. * Compressor continues to operate for 5 minutes or longer and detection is performed during operation.

ERROR CAUSE

1. Connector contact faulty.

2. Discharge temperature thermistor THD1 faulty.

1. Connector contact faulty.

2. Discharge temperature thermistor THD2 faulty.

REMEDY

Check for loose or dislodged discharge

temperature thermistor TH

connector.

2. Check discharge temperature thermistor TH

resistance. If abnormal,

replace thermistor.

Check for loose or dislodged discharge temperature thermistor TH

connector.

2. Check discharge temperature

thermistor TH

resistance. If abnormal,

replace thermistor.

Discharge temperature thermistor 3 error

1. Generation condition. Thermistor short or open

detected.

2. Corresponding operation.

1) Compressor 3 stop.

2) Error display to outdoor unit LED and error output to communication bus line.

3. Reset condition. Thermistor detection value

other than short or open. * Compressor continues to operate for 5 minutes or longer and detection is performed during operation.

1. Connector contact faulty.

2. Discharge temperature thermistor THD3 faulty.

Check for loose or dislodged discharge temperature thermistor TH

connector.

2. Check discharge temperature thermistor TH

resistance. If abnormal,

replace thermistor.

– 99 –

Page 100

ERROR

CODE

ERROR

Outdoor thermistor error

11 Heat exchange

outlet thermistor 1 error

Heat exchange

outlet thermistor 2 error

Heat exchange outlet thermistor 3 error

CONTENTS

1. Generation condition. Thermistor short or open

detected.

2. Corresponding operation.

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

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

3. Reset condition. Thermistor detection value

other than short or open.

ERROR CAUSE

1. Connector contact faulty.

2. Outdoor thermistor THH0 faulty.

1. Connector contact faulty.

2. Heat exchange outlet thermistor THH01 faulty.

1. Connector contact faulty.

2. Heat exchange outlet thermistor THH02 faulty.

1. Connector contact faulty.

2. Heat exchange outlet thermistor THH03 faulty.

REMEDY

Check for loose or dislodged thermistor TH

2. Check outdoor

connector.

thermistor TH

resistance. If abnormal,

outdoor

replace

thermistor.

Check for loose or dislodged heat

exchange

thermistor TH

connector.

2. Check heat exchange outlet

thermistor THH01 resistance.If abnormal,

replace thermistor.

Check for loose or dislodged

exchange

thermistor TH

heat

connector.

2. Check heat exchange outlet

thermistor TH

resistance.

If abnormal,

replace thermistor.

Check for loose or dislodged

exchange

thermistor TH

heat

connector.

2. Check heat exchange outlet

thermistor

resistance.If abnormal,

replace thermistor.

Heat exchange

inlet thermistor 1 error

Heat exchange inlet thermistor 2 error

Heat exchange

inlet thermistor 3 error

Suction

thermistor error

1. Connector contact faulty.

2. Heat exchange inlet thermistor THH11 faulty.

1. Connector contact faulty.

2. Heat exchange inlet thermistor THH12 faulty.

1. Connector contact faulty.

2. Heat exchange inlet thermistor THH13 faulty.

1. Connector contact faulty.

2. Suction thermistor THS faulty.

1. Check for loose or dislodged heat exchange inlet thermistor THH11 connector.

2. Check heat exchange

resistance. If abnormal,

thermistor TH

replace

thermistor.

1. Check for loose or dislodged heat exchange inlet thermistor THH12

connector.

2. Check heat exchange

resistance. If abnormal,

thermistor TH replace

thermistor.

1. Check for loose or dislodged heat exchange inlet thermistor THH13 connector.

2. Check heat exchange

resistance. If abnormal,

thermistor TH

replace

thermistor.

1. Check for loose or dislodged suction thermistor THS connector.

2. Check suction thermistor THS resistance. If abnormal, replace thermistor.

H11

H12

H13

– 100 –

Fujitsu UTF-Y90A4A Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual