Mitsubishi Electric PCA-A24KA, PCA-A30KA, PCA-A36KA, PCA-A42KA Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS

SERVICE MANUAL

Indoor unit
[Model names] [Service Ref.]

PCA-A24KA

PCA-A30KA

PCA-A36KA

PCA-A24KA
PCA-A30KA
PCA-A36KA

March 2009

No. OCH455

NOTE:

• This manual describes only
service data of the indoor
units.

• RoHS compliant products
have <G> mark on the
spec name plate.

PCA-A42KA

INDOOR UNIT

PCA-A42KA

Model name
indication

CONTENTS

1. REFERENCE MANUAL

2. SAFETY PRECAUTION

3. PART NAMES AND FUNCTIONS

4. SPECIFICATIONS

5. NOISE CRITERION CURVES

6. OUTLINES AND DIMENSIONS

7. WIRING DIAGRAM

8. REFRIGERANT SYSTEM DIAGRA

9. TROUBLESHOOTING

10. SPECIAL FUNCTION

11. DISASSEMBLY PROCEDURE

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12

13

11

28

31

2
3

4
6
8

9

TEMP.

REMOTE CONTROLLER

ON/OFF

PARTS CATALOG (OCB455)

1

REFERENCE MANUAL

1-1. OUTDOOR UNIT’S SERVICE MANUAL

Model name Service Ref. Service Manual No.
PUZ-A18/24/30/36/42NHA3 PUZ-A18/24/30/36/42NHA3

PUZ-A18/24/30/36/42NHA3-BS PUZ-A18/24/30/36/42NHA3-BS
PUY-A18/24/30/36/42NHA3 PUY-A18/24/30/36/42NHA3
PUY-A18/24/30/36/42NHA3-BS PUY-A18/24/30/36/42NHA3-BS
PUZ-HA30/36NHA2 PUZ-HA30/36NHA2 OCH426 OCB426

OCH
OCB

1-2. TECHNICAL DATA BOOK

Series (Outdoor unit) Manual No.
PUZ-A•NHA3(-BS) PUY-A•NHA3(-BS) OCS14

PUZ-HA•NHA2 OCS15

2

2

SAFETY PRECAUTION

2-1. ALWAYS OBSERVE FOR SAFETY

Before obtaining access to terminal, all supply
circuits must be disconnected.

2-2. CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilising refrigerant R410A

Use new refrigerant pipes.

Make sure that the inside and outside of refrige­rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.

Contamination inside refrigerant piping can cause deterio­ration of refrigerant oil etc.

Store the piping to be used indoors during
installation, and keep both ends of the piping
sealed until just before brazing. (Leave elbow
joints, etc. in their packaging.)

If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com­pressor.

Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.

If large amount of mineral oil enters, that can cause deterio­ration of refrigerant oil etc.

Do not use refrigerant other than R410A.

If other refrigerant (R22 etc.) is used, chlorine in refrige­rant can cause deterioration of refrigerant oil etc.

Use a vacuum pump with a reverse flow check
valve.

Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.

Use the following tools specifically designed for
use with R410A refrigerant.

The following tools are necessary to use R410A refrigerant.

Tools for R410A
Gauge manifold
Charge hose

Gas leak detector

Torque wrench

Flare tool
Size adjustment gauge
Vacuum pump adaptor

Electronic refrigerant
charging scale

Handle tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com­pressor.

Charge refrigerant from liquid phase of gas
cylinder.

If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.

[1] Cautions for service

(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigera­nt will change and the efficiency will be lowered.

Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.

3

[2] Additional refrigerant charge

When charging directly from cylinder

· Check that cylinder for R410A on the market is syphon type.

· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

Unit

Gravimeter

[3] Service tools

Use the below service tools as exclusive tools for R407C refrigerant.

No. Tool name Specifications
1 Gauge manifold · Only for R410A

· Use the existing fitting

· Use high-tension side pressure of 5.3MPa·G or over.
2 Charge hose · Only for R410A

· Use pressure performance of 5.09MPa·G or over.
3 Electronic scale
4 Gas leak detector · Use the detector for R134a, R407C or R410A.
5 Adaptor for reverse flow check · Attach on vacuum pump.
6 Refrigerant charge base
7 Refrigerant cylinder · Only for R410A Top of cylinder (Pink)

· Cylinder with syphon
8 Refrigerant recovery equipment

specifications

. (UNF1/2)

3

PART NAMES AND FUNCTIONS

Indoor Unit

Vane

Air outlet

Louver

Filter

Air intake

(Inside of Air intake)

4

Wired remote controller

Display Section

For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.

Identifies the current operation

Shows the operating mode, etc.
*Multilanguage display is available.

“Centrally Controlled” indicator

Indicates that operation from the
remote controller has been prohib­ited by a master controller.

“Timer is Off” indicator

Indicates that the timer is off.

Temperature Setting

Shows the target temperature.

Day-of-Week

Shows the current day of the week.

Time/Timer Display

Shows the current time, unless the simple or Auto Off
timer is set.
If the simple or Auto Off timer is set, the time to be
switched off is shown.

TIME SUN MON TUE WED THU FRI SAT
TIMER

AFTER

ERROR CODE

°F°C

Hr

AFTER

°F°C

ONLY1Hr.

Up/Down Air Direction indica­tor

The indicator shows the direc­tion of the outcoming airflow.

“One Hour Only” indicator

Displayed if the airflow is set to
Low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in one hour,
at which time the airflow direction
also changes.

Room Temperature display

Shows the room temperature. The room
temperature display range is 46-102°F.
The display blinks if the temperature
is less than 46°F or 102°F or more.

Louver display

Indicates the action of the swing louver.
Does not appear if the louver is not
running.

(Power On indicator)

Indicates that the power is on.

ON

OFF

FUNCTION

FILTER

WEEKLY

SIMPLE

AUTO OFF

“Sensor” indication

Displayed when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons have been locked.

“Clean The Filter” indicator

To be displayed on when it is time to
clean the filter.

Timer indicators

The indicator comes on if the corre­sponding timer is set.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in
Ventilation mode.

Operation Section

Temperature setting buttons

Down

Up

Timer Menu button
(Monitor/Set button)

Mode button (Return button)

Set Time buttons

Back

Ahead

Timer On/Off button
(Set Day button)

Opening the
lid

Note:

●

“PLEASE WAIT” message

TEMP.

MENU

BACK DAY

MONITOR/SET

PAR-21MAA

CLOCK

ON/OFF

OPERATION

ON/OFF

FILTER

CHECK

TEST

CLEAR

Built-in temperature sensor

This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure.

●

“NOT AVAILABLE” message
This message is displayed if an invalid button is pressed (to operate a function that the indoor unit does not have).
If a single remote controller is used to operate multiple indoor units simultaneously that are different types, this message will not be displayed as
far as any of the indoor units is equipped with the function.

ON/OFF button

Fan Speed button

Filter button
(<Enter> button)

Test Run button

Check button (Clear button)

Airflow Up/Down button

Louver button
( Operation button)

To return operation
number

Ventilation button
( Operation button)

To go to next operation
number

5

4

SPECIFICATIONS

4-1. SPECIFICATIONS

Service Ref.

Power supply(phase, cycle, voltage)

External finish
Heat exchanger
Fan Fan(drive) % No.

INDOOR UNIT

Operation control & Thermostat
Noise level(Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions

Weight

Service Ref.

Power supply(phase, cycle, voltage)

External finish
Heat exchanger
Fan Fan(drive) % No.

INDOOR UNIT

Operation control & Thermostat
Noise level(Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions

Weight

Max. Fuse Size
Min.Circuit Ampacity

Fan motor output
Fan motor

Airflow(Low-Medium2-Medium1-High)

External static pressure

W

D
H

Max. Fuse Size
Min.Circuit Ampacity

Fan motor output
Fan motor

Airflow(Low-Medium2-Medium1-High)

External static pressure

W

D
H

A
A

kW

F.L.A

3

/min(CFM)

m

Pa(mmAq)

dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)

kg(lbs)

A

A

kW

F.L.A

*/min(CFM)

Pa(mmAq)

dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)

kg(lbs)

PCA-A24KA

1 phase, 60Hz, 208/230V

15

1

White Munsell 6.4Y 8.9/0.4

Plate fin coil

Sirocco fan (direct) % 3

0.095

0.54

Dry: 15-16-17-19(530-565-600-670)

Wet: 14-15-16-18(495-530-565-635)

0(direct blow)

Remote controller & built-in

33-35-37-40

26(1-1/32)

1,280(50-3/8)

680(26-3/4)

230(9-1/16)

32(71)

PCA-A30KA

1 phase, 60Hz, 208/230V

15

1

White Munsell 6.4Y 8.9/0.4

Plate fin coil

Sirocco fan (direct) % 3

0.095

0.54
Dry: 16-17-18-20(565-600-635-705)
Wet:15-16-17-19(530-565-600-670)

0(direct blow)

Remote controller & built-in

35-37-39-41

26(1-1/32)

1,280(50-3/8)

680(26-3/4)

230(9-1/16)

32(71)

Service Ref.

Power supply(phase, cycle, voltage)

External finish
Heat exchanger
Fan Fan(drive) % No.

INDOOR UNIT

Operation control & Thermostat
Noise level(Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions

Weight

Max. Fuse Size
Min.Circuit Ampacity

Fan motor output
Fan motor

Airflow(Low-Medium2-Medium1-High)

External static pressure

*/min(CFM)

Pa(mmAq)

W

D
H

A
A

kW

F.L.A

dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)

kg(lbs)

PCA-A36KA

1 phase, 60Hz, 208/230V

15

2

White Munsell 6.4Y 8.9/0.4

Plate fin coil

Sirocco fan (direct) % 4

0.160

0.97
Dry: 22-24-26-28(775-850-920-990)
Wet:20-22-24-26(705-775-850-920)

0(direct blow)

Remote controller & built-in

37-39-41-43

26(1-1/32)

1,600(63)
680(26-3/4)
230(9-1/16)

36(79)

66

Service Ref.

Power supply(phase, cycle, voltage)

External finish
Heat exchanger
Fan Fan(drive) % No.

INDOOR UNIT

Operation control & Thermostat
Noise level(Low-Medium2-Medium1-High)
Field drain pipe O.D.
Dimensions

Weight

Max. Fuse Size
Min.Circuit Ampacity

Fan motor output
Fan motor

Airflow(Low-Medium2-Medium1-High)

External static pressure

W

D
H

A
A

kW

F.L.A

*/min(CFM)

Pa(mmAq)

dB
mm(in.)
mm(in.)
mm(in.)
mm(in.)

kg(lbs)

PCA-A42KA

1 phase, 60Hz, 208/230V

15

2

White Munsell 6.4Y 8.9/0.4

Plate fin coil

Sirocco fan (direct) % 4

0.160

0.97
Dry: 23-25-27-29(810-885-955-1025)
Wet: 21-23-25-27(740-810-885-955)

0(direct blow)

Remote controller & built-in

39-41-43-45

26(1-1/32)

1,600(63)
680(26-3/4)
230(9-1/16)

38(84)

77

NOISE CRITERION CURVES5

NOTCH

PCA-A24KA PCA-A30KA

SPL(dB)

High
Medium1
Medium2

Low

90

80

70

60

50

40

30

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar)

PCA-A36KA

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NOTCH

High

SPL(dB)

Medium1
Medium2

Low

90

LINE
40
37
35
33

90

80

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar)

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

LINE

43

PCA-A42KA

41
39
37

90

NOTCH

High
Medium1
Medium2

Low

BAND CENTER FREQUENCIES, Hz

NOTCH

High
Medium1
Medium2

Low

SPL(dB)

41
39
37
35

SPL(dB)

45
43
41
39

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

LINE

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar)

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

3.3ft

3.3ft
about 4.62ft

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar)

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

ceiling

unit

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

MICROPHONE

8

OUTLINES AND DIMENTIONS6

PCA-A24KA PCA-A30KA Unit: inch (mm)

Drainage

liquid Φ3/8(Φ9.52)

gas Φ5/8(Φ15.88)

When drain socket

is installed

9-5/16(236)

7-7/8(200)

9-3/16(233)

9-11/16(246)

7-1/16(180)

Emergency operation

switch <Heating>

DEFROST/STAND BY lamp

Operation lamp

Receiver

In case of wireless remote controller

and i-see sensor(Optional Parts)

Emergency operation

switch <Cooling>

2-1/4(57)

i-see sensor

NOTES.

1.Use M10 or W3/8 screw for anchor bolt.

2.Please be sure when installing the drain lift up

mechanism(option parts),refrigerant pipe will be only upward.

26-3/4(680)

18-3/4(476)

10(254)

6

2-7/16(62)

3-1/8(80)

12-5/8(320)

26-3/4(680)

2(51)

3/8(10)

3/16(5)

14

9/16

In case of wireless

remote controller

and i-see sensor

9-1/16(230)

7-11/16(195)

3-7/16(88)

3-5/16(84)

(Optional Parts)

3-3/8(85)

5-1/2(140)

11/16(18)

5-7/8(150)

48-11/16(1237) (Suspension bolt pitch)

46-3/16(1173)

7-3/16(182)

47-3/16(1198)

Air outlet

4-15/16(126)

1/16(1)

7-1/12(190)

1-7/16(37)

1/16(2) 1/16(2)50-3/8(1280)

Air intake

4

3-3/8(85)

10-1/4(260)

1/16(2)

3-3/8(86)

120°

Ceiling

3(76)

5-7/16(138)

11/16(18)

1-1/2(38)

Φ4-15/16(Φ125)

4-3/4(121)

4-7/8(124)

15-1/4(387)

7

7

8

8

18-1/8(461)

In case of the rear pipe arrangement, make sure to

remove the shaded portions from the independent piece.

Then put the independent piece back in initial

1-7/8(48)5/16(8)

position.(The heat exchanger might be clogged because of dust)

When drain socket

2

Drainage

is installed

9-11/16(246)

9-3/16(233)

1

5

[FRONT VIEW]

3

Electrical box

7-1/2(190)

2-15/16(75)

2

When electrical box

is pulled down

1-13/16(46)

Electrical box

9

Drainage pipe connection(1(26mm)I.D.)

Drainage pipe connection(for the left arrangement)

Knockout hole for left drain-piping arrangement

Refrigerant-pipe connection(gas pipe side/flared connection)

Refrigerant-pipe connection(liquid pipe side/flared connection)

Knockout hole for upper drain pipe arrangement

Knockout hole for fresh air intake Φ3-15/16(Φ100)

Knockout hole for wiring arrangement Φ7/8(Φ22)

3

214

5

6

Accessory...Drain socket (1(26mm) I.D.)

8

7

PCA-A36KA PCA-A42KA Unit: inch (mm)

Drainage

When drain socket

is installed

gas Φ5/8(Φ15.88)

liquid Φ3/8(Φ9.52)

9-5/16(236)

9-3/16(233)

7-7/8(200)

7-1/16(180)

2(51)

3/8(10)

80

3-1/8

62

2-7/165-1/2

6

26-3/4(680)

12-5/8(320)

3/16(5)

1/16(2)

9-1/16(230)

9-11/16(246)

14

9/16

In case of wireless

remote controller

and i-see sensor

(Optional Parts)

7-11/16(195)

3-7/16(88)

3-5/16(84)

85

Emergency operation

switch <Heating>

DEFROST/STAND BY lamp

Operation lamp

Receiver

In case of wireless remote controller

and i-see sensor(Optional Parts)

Emergency operation

switch <Cooling>

57

2-1/4

26-3/4(680)

18-3/4(476)

10(254)

Air intake

140

11/16(18)

5-7/8(150)

61-5/16(1557) (Suspension bolt pitch)

NOTES.

1.Use M10 or W3/8 screw for anchor bolt.

2.Please be sure when installing the drain lift up

mechanism (option parts),refrigerant pipe will be only upward.

4-15/16(126)

1/16(1)

4

3-3/8(85)

10-1/4(260)

1/16(2)

3-3/8(86)

1

1

5

120°

7-1/2(190)

5-7/16(138)

11/16(18)

1-7/16(37)

1-1/2(38)

15/16(Φ125)

Φ4-

4-3/4(121)

15-1/4(387)

7

8

18-1/8(461)

Ceiling

3(76)

[FRONT VIEW]

4-7/8(124)

In case of the rear pipe arrangement, make sure to

remove the shaded portions from the independent piece.

Then put the independent piece back in initial

position.(The heat exchanger might be clogged because of dust)

58-3/4(1493)

1/16(2) 63(1600)

Electrical box

1-7/8(48)5/16(8)

Air outlet

Drainage

When drain socket

is installed

9-11/16(246)

9-3/16(233)

2

182

7-3/16 3-3/8

59-3/4(1518)

Knockout hole for upper drain pipe arrangement

Knockout hole for fresh air intake Φ3-15/16(Φ100)

Knockout hole for wiring arrangement Φ7/8(Φ22)

Drainage pipe connection(1(26mm)I.D.)

Drainage pipe connection(for the left arrangement)

Knockout hole for left drain-piping arrangement

Refrigerant-pipe connection

(gas pipe side/flared connection)

Refrigerant-pipe connection

(liquid pipe side/flared connection)

5

4

3

2

11

Accessory...Drain socket (1(26mm)I.D.)

8

7

6

Electrical box

2-15/16(75)

2-15/16(75)

3

7-1/2(190)

1-13/16(46)

When electrical box

is pulled down

2

10

WIRING DIAGRAM7

PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA

[LEGEND]

SYMBOL SYMBOLNAME NAME

I.B

CN2L
CN24
CN30
CN32
CN41
CN51
DSA
FUSE
LED1
LED2
LED3
SW1
SW2
SWE
X1

ZNR01,02
R.B
MF
MV

INDOOR CONTROLLER BOARD
CONNECTOR (LOSSNAY)
CONNECTOR (BACK-UP HEATING)
CONNECTOR (LLC)
CONNECTOR (REMOTE SWITCH)
CONNECTOR (HA TERMINAL-A)
CONNECTOR (CENTRALLY CONTROL)
SURGE ABSORBER
FUSE (T6.3AL250V)
POWER SUPPLY (I.B)
POWER SUPPLY (R.B)
TRANSMISSION (INDOOR-OUTDOOR)
SWITCH (MODEL SELECTION) +See table 1
SWITCH (CAPACITY CODE) +See table 2
CONNECTOR (EMERGENCY OPERATION)
RELAY (DRAIN LIFT UP MECHANISM)
VAR IST OR
WIRED REMOTE CONTROLLER BOARD

FAN MOTOR
VANE MOTOR

TB4
TB5,TB6

TH1

TH2

TH5

OPTIONAL PARTS

W.B

BZ
LED1
LED2
RU
SW1
SW2

DP

FS

TERMINAL BLOCK (

INDOOR/OUTDOOR CONNECTING LINE
TERMINAL BLOCK (REMOTE CONTROLLER
TRANSMISSION LINE)

ROOM TEMP. THERMISTOR
(32ºF / 15kΩ, 77ºF/ 5. 4kΩ DETECT)
PIPE TEMP. THERMISTOR/LIQUID
(32ºF / 15kΩ, 77ºF/ 5. 4kΩ DETECT)
COND. / EVA. TEMP. THERMISTOR
(32ºF / 15kΩ, 77ºF/ 5. 4kΩ DETECT)

PCB FOR WIRELESS REMOTE CONTROLLER
BUZZER
LED (OPERATION INDICATION : GREEN)
LED (PREPARATION FOR HEATING : ORANGE)
RECEIVING UNIT
EMERGENCY OPERATION (HEAT / DOWN)
EMERGENCY OPERATION (COOL / UP)
DRAIN LIFT UP MECHANISM
DRAIN FLOAT SWITCH

)

I.B

VAN E

CNV

20

(WHT)

12345678910111213141516171819

I-SEE

WIRELESS

CN90

(WHT)

19

9

CNB

5

M

MV

W.B

(OPTIONAL PARTS)

<Table 2>SW2(CAPACITY CODE)

MODELS

PCA-A24KA

PCA-A30KA

BZ

SW1

LED2

SW2

LED1

RU

Service Service

12345

12345

SENSOR

CN4Y

(WHT)

141 6

4

I-SEE

SENSOR

I-SEE SENSOR

(OPTIONAL PARTS)

SW2

MODELS

PCA-A36KA

ON
OFF

PCA-A42KA

ON
OFF

LED3 LED2 LED1

I-SEE

SENSOR MOTOR

CN6Y
(RED)

5

When attaching

M

drain lift up

MT

mechanism
(optional parts),
remove the jumper
connector CN4F
and fit the drain
float switch (FS).

12345

ON
OFF

12345

ON
OFF

Refer to tables 1 and 2

2

1

TB6

R.B

SW2SW1

J42J41

Pair No.

51

CN2L

21

(RED)

FLOAT SW

CN4F

(WHT)

ON OFF

4

When attaching
drain lift up
mechanism
(optional parts)

FLOAT SW

CN4F

(WHT)

TB5

TRANSMISSION
WIRES
DC12V

CN32

(WHT)

113

CN51(WHT)

CN41(WHT)

SWE

CN24

(YLW)

41

14

FS

2
1

INDOOR/OUTDOOR

COMMUNICATION

12

21

REMOCON

CN22

(BLU)

LIQUID/PIPE

CN44
(WHT)

14

t° t° t°

TH2 TH5 TH1

<Table 1>SW1(MODEL SELECTION)

SW1

Service

12345

ON
OFF

OUTDOOR

135

CN01

ZNR02

FAN
CNMF
(WHT

)

MS

3~

MF

(OPTIONAL PARTS)

(BLK)

DSA

U

331

M

1~

DP

U

ZNR01

X1

D.U.M

CNP

(BLU)

FUSE

YLW

ORN

ORN
BRN

YLW
ORN

TB4

+

S1
S2
S3

3

1

CN3C

(BLU)

DC294~325V

RECTIFICATION

INTAKE

CN30

CN20

(GRN)

(RED)

1

21

741

+

Be sure to turn off the source power
and then disconnect fan motor connector.
(Failure to do so will cause trouble in Fan motor)

1

TO OUTDOOR
UNIT

1.SymboIs used in wiring diagram above are, : Connector, : Terminal block.

Notes:

2.

Indoor and outdoor connecting wires have poIarities, make sure to match terminal numbers (S1, S2, S3) for correct wirings.

3.Since the outdoor side electric wiring may change, be sure to check the outdoor unit electric wiring for servicing.

+

1: Use copper supply wire.

11

REFRIGERANT SYSTEM DIAGRAM8

PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA

Strainer

Heat exchanger

Room temperature
thermistor (TH1)

Condenser/evaporator
temperature thermistor
(TH5)

Pipe temperature
thermistor/liquid
(TH2)

Distributor
with strainer 1/2
#50/#50

#50

Refrigerant GAS pipe connection
(Flare)

Refrigerant LIQUID pipe connection
(Flare)

Strainer
#50

Refrigerant flow in cooling
Refrigerant flow in heating

12

TROUBLESHOOTING9

9-1. TROUBLESHOOTING

<Error code display by self-diagnosis and actions to be taken for service (summary)>

Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit.
Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents
below before investigating details.

Unit conditions at service

The trouble is reoccurring.

The trouble is not reoccurring.

Error code

Displayed

Not displayed

Logged

Not logged

Actions to be taken for service (summary)

Judge what is wrong and take a corrective action
according to “9-3. Self-diagnosis action table”.

Conduct troubleshooting and ascertain the cause of the
trouble according to “9-4. Troubleshooting by inferior
phenomena”.

Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise and etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring and etc.
Reset error code logs and restart the unit after finishing
service.
There is no abnormality in electrical component,
controller board,remote controller and etc.

Re-check the abnormal symptom.
Conduct trouble shooting and ascertain the cause of the

trouble according to “9-4. Troubleshooting by inferior
phenomena”.
Continue to operate unit for the time being if the cause
is not ascertained.
There is no abnormality concerning of parts such as
electrical component, controller board, remote controller
and etc.

13

9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER

<In case of trouble during operation>

When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform
unusual stop.

<Malfunction-diagnosis method at maintenance service>

[Procedure]

CHECK
display

ON/OFF
button

CHECK
button

ON/OFF

MODE

CHECK

TEST RUN

SET

CHECK

FAN

VAN E

LOUVER

RESET

TEMP

CLOCK

AUTO STOP

AUTO S TART

h

min

Refrigerant
address
display

Temperature
button

HOUR
button

1. Press the CHECK button twice.

2. Press the temperature
buttons.

3. Point the remote controller at the

sensor on the indoor unit and
press the HOUR button.

• "CHECK" lights, and refrigerant
address "00" blinks.

• Check that the remote controller's
display has stopped before continuing.

• Select the refrigerant address of the
indoor unit for the self-diagnosis.

Note: Set refrigerant address using the

outdoor unit’s DIP switch (SW1).

(For more information, see the
outdoor unit installation manual.)

• If an air conditioner error occurs, the
indoor unit's sensor emits an intermit­tent buzzer sound, the operation lamp
blinks, and the error code is
output.

(It takes 3 seconds at most for error

code to appear.)

4. Point the remote controller at the
sensor on the indoor unit and
press the ON/OFF button.

• The check mode is cancelled.

14

• Refer to the following tables for details on the check codes.
[Output pattern A]

Beeper sounds

OPERATION
INDICATOR
lamp blink
pattern

Beep

Self-check
starts
(Start signal
received)

Beep Beep Beep Beep Beep Beep

1st2nd3

Off

Approx. 2.5 sec.On0.5 sec.On0.5 sec.On0.5 sec.

Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “P5”)

rd

th

n

On

0.5 sec.

[Output pattern B]

Beeper sounds

OPERATION
INDICATOR
lamp blink
pattern

Self-check
starts
(Start signal
received)

Off

Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.On0.5 sec.

1st2nd3

Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)

[Output pattern A] Errors detected by indoor unit

Wireless remote controller

Wired remote controller

Beeper sounds/OPERATION

INDICATOR lamp blinks

Check code

(Number of times)

1P1

2

P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error

3E6,E7

Intake sensor error

Indoor/outdoor unit communication error

4 P4 Float switch connector (CN4F) open

5

P5
PA

Drain pump error
Forced compressor stop(due to water leakage abnormality)

6 P6 Freezing/Overheating protection operation
7 EE Communication error between indoor and outdoor units
8 P8 Pipe temperature error

9 E4, E5 Remote controller signal receiving error
10
11

–

–

–

–

12 Fb Indoor unit control system error (memory error, etc.)

–

E0, E3

Remote controller transmission error

– E1, E2 Remote controller control board error

nd

1st2

Off

Approx. 2.5 sec.On0.5 sec.On0.5 sec.

Number of blinks/beeps in pattern indicates
the check code in the following table

peeBpeeBpeeBpeeBpeeB

rd

th

n

On

0.5 sec.

Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.

· · · Repeated

Off

Beep Beep

Number of blinks/beeps in pattern indicates
the check code in the following table

1st2

nd

· · · Repeated

krameRmotpmyS

[Output pattern B]

Wireless remote controller

Errors detected by unit other than indoor unit (outdoor unit, etc.)

Wired remote controller

Beeper sounds/OPERATION

INDICATOR lamp blinks Check code

(Number of times)

1

2

3

4

5

6

7

8

9
10

11

12

13
14

E9

UP
U3,U4
UF

U2

U1,Ud

U5
U8
U6
U7

U9,UH

–
–

Others

*1 If the beeper does not sound again after the initial

the OPERATION INDICATOR lamp does not come on,

Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)

Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/49C worked/

insufficient refrigerant
Abnormal high pressure (63H worked)/Overheating

protection operation

Abnormal temperature of heatsink

Outdoor unit fan protection stop

Compressor overcurrent interruption/Abnormal of power module
Abnormality of superheat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and

abnormal synchronous signal to main circuit/Current sensor error

–
–

Other errors (Refer to the technical manual for the outdoor unit.)

2 beeps to confirm the self-check start signal was received and

there are no error records.

For details, check
the LED display
of the outdoor
controller board.
As for outdoor
unit, refer to
outdoor unit's
service manual.

*2 If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial 2 beeps to confirm

the self-check start signal was received, the specified refrigerant address is incorrect.

krameRmotpmyS

15

• On wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.

Blink of operation lamp

• On wired remote controller
Check code displayed in the LCD. (Refer to the previous page, check code.)

If the unit cannot be operated properly after the test run, refer to the following table to find out the cause.

•

Symptom

Wired remote controller LED 1, 2 (PCB in outdoor unit)

PLEASE WAIT

PLEASE WAIT

Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).

On the wireless remote controller with condition above, following phenomena take place.

• No signals from the remote controller can be received.

• OPE lamp is blinking.

• The buzzer makes a short ping sound.

Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)

For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.

LED1 (power for microcomputer) Indicates whether control power is supplied. Make sure that this LED is

LED2 (power for remote controller)

LED3 (communication between indoor and
outdoor units)

Error code

For about 2
minutes after
power-on

Subsequent to
about 2 minutes
after power-on

After LED 1, 2 are lighted, LED 2 is

turned off, then only LED 1 is
lighted.

(Correct operation)

Only LED 1 is lighted.

Only LED 1 is lighted.

always lit.
Indicates whether power is supplied to the remote controller.

This LED lights only in the case of the indoor unit which is connected to the
outdoor unit refrigerant addresses “0”.

Indicates state of communication between the indoor and outdoor units.
Make sure that this LED is always blinking.

LED 1, 2 blink.

LED 1 blinks twice,
LED 2 blinks once.

•For about 2 minutes following power-on,op­eration of the remote controller is not possible
due to system start-up. (Correct operation)

•Connector for the outdoor unit’s protection
device is not connected.

•Reverse or open phase wiring for the outdoor
unit’s power terminal block (L1, L2, GR)

•Incorrect wiring between indoor and outdoor
units (incorrect polarity of S1, S2, S3)

•Remote controller wire short

Cause

16

9-3. SELF-DIAGNOSIS ACTION TABLE

Error Code

P1

P2

Abnormal point and detection method

Room temperature thermistor (TH1)

The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3 min­utes. (The unit returns to normal opera­tion, if it has been reset normally.)
Constantly detected during cooling,
drying, and heating operation.
Short: 90
Open: -40

Pipe temperature thermistor/Liquid
(TH2)

The unit is in 3-minute resume
prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after 3 min­utes. (The unit returns to normal opera­tion, if it has been reset normally.)
Constantly detected during cooling,
drying, and heating (except defrosting)
operation.
Short: 90
Open: -40

Note: Refer to the manual of outdoor unit for the details of display
such as F, U, and other E.

Cause

Defective thermistor
characteristics
Contact failure of connector
(CN20) on the indoor controller
board (Insert failure)
Breaking of wire or contact
failure of thermistor wiring
Defective indoor controller
board

Defective thermistor
characteristics
Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
Breaking of wire or contact
failure of thermistor wiring
Defective refrigerant circuit is
causing thermistor tempera­ture of 90

-40
Defective indoor controller
board

Countermeasure

– Check resistance value of thermistor.

0
10
20
30
40

••••••••••

••••••••••••

••••••••••••

••••••••••••

•••••••••••

15.0k

9.6k

6.3k

4.3k

3.0k
If you put force on (draw or bend) the lead wire
while measuring resistance value of thermis­tor, breaking of wire or contact failure can be
detected.

Check contact failure of connector (CN20) on
the indoor controller board. Refer to 9-7.
Turn the power on again and check restart
after inserting connector again.
Check room temperature display on remote
controller.
Replace indoor controller board if there is
abnormal difference with actual room
temperature.

Turn the power off, and on again to operate
after check.

Check resistance value of thermistor.

–

For characteristics, refer to (P1) above.

Check contact failure of connector (CN44) on
the indoor controller board. Refer to 9-7.
Turn the power on and check restart after
inserting connector again.
Check pipe <liquid> temperature with remote
controller in test run mode. If pipe <liquid>
temperature is extremely low (in cooling
mode) or high (in heating mode), refrigerant
circuit may have defect.
Check pipe <liquid> temperature with remote
controller in test run mode. If there is extremely
difference with actual pipe <liquid> temperature,
replace indoor controller board.

Contact failure of drain float switch (CN4F)

Extract when the connector of drain float

P4

(5701)

switch is disconnected.

and of connector CN4F is not

(
short-circuited.)
Constantly detected during operation.

Drain overflow protection operation

Suspensive abnormality, if drain float
switch is detected to be underwater for
1 minute and 30 seconds continuously
with drain pump on.
Turn off compressor and indoor fan.
Drain pump is abnormal if the condition
above is detected during suspensive
abnormality.

P5

Constantly detected during drain pump
operation.

Contact failure of connector
(Insert failure)

Defective indoor controller
board

Malfunction of drain pump
Defective drain
Clogged drain pump
Clogged drain pipe
Defective drain float switch
Catch of drain float switch or
malfunction of moving parts
cause drain float switch to be
detected under water (Switch
On)
Defective indoor-controller
board

17

Turn the power off, and on again to operate
after check.

Check contact failure of float switch connec­tor.
Turn the power on again and check after
inserting connector again.
Operate with connector (CN4F) short-circuited.
Replace indoor controller board if abnormality
reappears.

Check if drain-up machine works.
Check drain function.

Remove drain float switch connector CN4F
and check if it is short (Switch On) with the
moving part of float switch UP, or OPEN with
the moving part of float switch down.
Replace float switch if it is short with the
moving part of float switch down.
Replace indoor controller board if it is short­circuited between

- of the drain float
switch connector CN4F and abnormality
reappears.

It is not abnormal if there is no problem about
the above-mentioned

~
Turn the power off, and on again to operate
after check.

Error Code

Abnormal point and detection method

Freezing/overheating protection is work­ing

Freezing protection (Cooling mode)

The unit is in 6-minute resume prevention
mode if pipe <liquid or condenser/evapo­rator> temperature stays under

the compressor started. Abnormal if it

again within 16 minutes after 6-minute
resume prevention mode.

Cause

(Cooling or drying mode)

Clogged filter (reduced airflow)
Short cycle of air path
Low load (low temperature)
operation out of the tolerance
range
Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is defec­tive.
Defective outdoor fan control
Overcharge of refrigerant
Defective refrigerant circuit
(clogs)

Countermeasure

(Cooling or drying mode)

Check clogs of the filter.
Remove shields.

Refer to 9-6.

Check outdoor fan motor.

Check operating condition of refrigerant
circuit.

P6

P8

Overheating protection (Heating mode)
The units is in 6-minute resume
prevention mode if pipe <liquid or

condenser/
detected as over 70°C[158°F] after the
compressor started. Abnormal if the
temperature of over 70°C[158°F] is
detected again within 10 minutes after
6 minute resume prevention mode.

Pipe temperature

<Cooling mode>
Detected as abnormal when the pipe tem­perature is not in the cooling range 3 min­utes after compressor start and 6 minutes
after the liquid or condenser/evaporator pipe
is out of cooling range.
Note 1) It takes at least 9 minutes to detect.
Note 2) Abnormality P8 is not detected in

Cooling range : - (TH-TH1)
TH: Lower temperature between liquid pipe

temperature (TH2) and condenser/
evaporator temperature (TH5)

TH1: Intake temperature

<Heating mode>
When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when condenser/
evaporator pipe temperature is not in heat­ing range within 20 minutes.
Note 3) It takes at least 27 minutes to

Note 4) It excludes the period of defrosting

Heating range : (TH5-TH1)

evaporator> temperature is

drying mode.

detect abnormality.

(Detection restarts when defrosting
mode is over)

(Heating mode)

Clogged filter (reduced airflow)
Short cycle of air path
Overload (high temperature)
operation out of the tolerance
range
Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is defec­tive.
Defective outdoor fan control
Overcharge of refrigerant
Defective refrigerant circuit
(clogs)
Bypass circuit of outdoor unit
is defective.

Slight temperature difference
between indoor room
temperature and pipe <liquid
or condenser/evaporator>
temperature thermistor

• Shortage of refrigerant

• Disconnected holder of pipe
<liquid or condenser/

evaporator> thermistor

• Defective refrigerant circuit

Converse connection of
extension pipe (on plural units
connection)
Converse wiring of indoor/
outdoor unit connecting wire
(on plural units connection)
Defective detection of indoor
room temperature and pipe
<condenser/evaporator>
temperature thermistor
Stop valve is not opened
completely.

(Heating mode)

Check clogs of the filter.
Remove shields.

Refer to 9-6.

Check outdoor fan motor.

Check operating condition of refrigerant

~

circuit.

~ Check pipe <liquid or condenser/evap-

orator> temperature with room tempera­ture display on remote controller and
outdoor controller circuit board.
Pipe <liquid or condenser/evaporator>
temperature display is indicated by set­ting SW2 of outdoor controller circuit
board as follows.

Conduct temperature check with outdoor
controller circuit board after connecting

(

‘A-Control Service Tool (PAC-SK52ST)’.

Check converse connection of extension

pipe or converse wiring of indoor/outdoor
unit connecting wire.

)

18

Error Code

P9

Abnormal point and detection method

Pipe temperature thermistor/
Condenser-Evaporator (TH5)

The unit is in 3-minute resume protec­tion mode if short/open of thermistor is
detected. Abnormal if the unit does not
get back to normal within 3 minutes. (The
unit returns to normal operation, if it has
been reset normally.)
Constantly detected during cooling,
drying, and heating operation (except
defrosting)

Cause

Defective thermistor
characteristics
Contact failure of connector
(CN44) on the indoor controller
board (Insert failure)
Breaking of wire or contact
failure of thermistor wiring
Temperature of thermistor is

defective refrigerant circuit.
Defective indoor controller
board

Countermeasure

– Check resistance value of thermistor.

For characteristics, refer to (P1) above.
Check contact failure of connector (CN44) on
the indoor controller board. Refer to 9-7.
Turn the power on and check restart after
inserting connector again.
Operate in test run mode and check pipe <con­denser/evaporator> temperature with outdoor
controller circuit board. If pipe
<condenser/evaporator> temperature is exclu­sively low (in cooling mode) or high (in heating
mode), refrigerant circuit may have defect.
Operate in test run mode and check pipe <con­denser/evaporator> temperature with outdoor
control circuit board. If there is
extreme difference with actual pipe
<condenser/evaporator> temperature, replace
indoor controller board.
There is no abnormality if none of above comes
within the unit.
Turn the power off and on again to operate.

In case of checking pipe temperature
with outdoor controller circuit board,
be sure to connect A-control service

(

tool (PAC-SK52ST).

)

PA

(2500)

E0

or

E4

Forced compressor stop
(due to water leakage abnormality)

The unit has a water leakage abnor­mality when the following conditions, a)
and b), are satisfied while the above­mentioned detection is performed.

a) The intake temperature subtracted

with liquid pipe temperature detects to
be less than -10
30 minutes. (When the drain sensor
is detected to be NOT soaked in the
water, the detection record of a) and b)
will be cleared.)

b) Drain float switch detects to be in the

water for more than 15 minutes.

*Once the water leakage abnormality is

detected, abnormality state will not be
released until the main power is reset.

Remote controller transmission
error(E0)/signal receiving error(E4)

Abnormal if main or sub remote con-

troller cannot receive any transmission

normally from indoor unit of refrigerant

address “0” for 3 minutes.

(Error code : E0)

Abnormal if sub remote controller could

not receive for any signal for 2 minutes.

(Error code: E0)

Abnormal if indoor controller board

cannot receive any data normally from

remote controller board or from other

indoor controller board for 3 minutes.

(Error code: E4)

Indoor controller board cannot receive

any signal from remote controller for 2

minutes. (Error code: E4)

[14

Drain pump trouble
Drain defective

· Drain pump clogging

· Drain pipe clogging
Open circuit of float switch
Contact failure of float switch

connector

Dew condensation on float switch

·Drain water descends along
lead wire.

·Drain water waving due to filter
clogging.

Extension piping connection

difference at twin, triple, quad­ruple system.

Miswiring of indoor/outdoor

connecting at twin, triple, quad­ruple system.

Room temperature thermistor/

liquid pipe temperature thermis­tor detection is defective.

Contact failure at transmission
wire of remote controller
All remote controllers are set
as “sub” remote controller. In
this case, E0 is displayed on
remote controller, and E4 is
displayed at LED (LED1, LED2)
on the outdoor controller circuit
board.
Miswiring of remote controller
Defective transmitting receiving
circuit of remote controller
Defective transmitting receiving
circuit of indoor controller board
of refrigerant addresses “0”.
Noise has entered into the
transmission wire of remote
controller.

Check the drain pump.
Check whether water can be drained.

Check the resistance of the float switch.
Check the connector contact failure.

Check the float switch leadwire mounted.

Check the filter clogging.

Check the piping connection.

Check the indoor/outdoor connecting wires.

Check the room temperature display of

remote controller.
Check the indoor liquid pipe temperature dis­play of outdoor controller board.

Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
Set one of the remote controllers “main”
if there is no problem with the action above.
Check wiring of remote controller.

(Do not use cable 3 or more.)

• The number of connecting indoor units:
max. 16 units

• The number of connecting remote control
ler: max. 2 units

When the above-mentioned problem of
are not applied,

Diagnose remote controllers.

a) When “RC OK” is displayed, remote con-

trollers have no problem. Turn the power
off, and on again to check. If abnormality
generates again, replace indoor controller
board.

b) When “RC NG” is displayed, replace

remote controller.
c) When “RC E3” or “ERC 00-06” is dis­ played, noise may be causing abnormality.

If the unit is not normal after replacing
indoor controller board in group control,
indoor controller board of address “0”
may be abnormal.

-

~

19

Error Code

E3

or

E5

Abnormal point and detection method

Remote controller transmission
error(E3)/signal receiving error(E5)

Abnormal if remote controller could not
find blank of transmission path for 6 sec­onds and could not transmit.

(Error code: E3)

Remote controller receives transmitted
data at the same time, compares the
data, and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E3)

Abnormal if indoor controller board could
not find blank of transmission path.

(Error code: E5)

Indoor controller board receives trans­mitted data at the same time, compares
the data,and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E5)

Cause

2 remote controllers are set as

“main.”
(In case of 2 remote con­ trollers)

Remote controller is connected

with 2 indoor units or more.

Repetition of refrigerant

address

Defective transmitting receiving

circuit of remote controller

Defective transmitting receiving

circuit of indoor controller board

Noise has entered into trans-

mission wire of remote control-

ler.

Countermeasure

Set a remote controller to main, and the
other to sub.

Remote controller is connected with only one
indoor unit.
The address changes to a separate setting.

~ Diagnose remote controller.

a) When “RC OK” is displayed, remote con-

trollers have no problem.
Turn the power off, and on again to check.
When becoming abnormal again, replace
indoor controller board.

b) When “RC NG” is displayed, replace

remote controller.

c) When “RC E3” or “ERC 00-66” is dis-

played, noise may be causing abnormal­ity.

E6

E7

Fb

Indoor/outdoor unit communication
error (Signal receiving error)

Abnormal if indoor controller board
cannot receive any signal normally for 6
minutes after turning the power on.
Abnormal if indoor controller board
cannot receive any signal normally for 3
minutes.
Consider the unit as abnormal under
the following condition: When 2 or more
indoor units are connected to an
outdoor unit, indoor controller board
cannot receive a signal for 3 minutes
from outdoor controller circuit board, a
signal which allows outdoor controller
circuit board to transmit signals.

Indoor/outdoor unit communication
error (Transmitting error)

Abnormal if indoor controller board
receives “1” 30 times continuously when
indoor controller board transmits “0” signal.

Indoor controller board

Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.

Contact failure, short circuit or,

miswiring (converse wiring) of

indoor/outdoor unit connecting

wire

Defective transmitting receiving

circuit of outdoor controller

circuit board

Defective transmitting receiving

circuit of indoor controller board

Noise has entered into indoor/

outdoor unit connecting wire.

Defective transmitting receiving

circuit of indoor controller board

Noise has entered into power

supply.

Noise has entered into outdoor

control wire.

Defective indoor controller

board

Check LED display on the outdoor control
circuit board. (Connect A-control service
tool, PAC-SK52ST.)
Refer to EA-EC item if LED displays EA-EC.
Check disconnection or looseness of indoor/
outdoor unit connecting wire of indoor unit or

outdoor unit.
Check all the units in case of twin indoor
unit system.

- Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board or outdoor
controller circuit board.

Other indoor controller board may have
defect in case of twin indoor unit system.

-

Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.

Replace indoor controller board.

Remote controller control board

Abnormal if data cannot be read nor­mally from the nonvolatile memory of the
remote controller control board.

(Error code: E1)

E1

or

E2

Abnormal if the clock function of remote
controller cannot be operated normally.

(Error code: E2)

Defective remote controller Replace remote controller.

20

9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA

Note: Refer to the manual of outdoor unit for the detail of remote

controller.

Phenomena

(1)LED2 on indoor controller board
is off.

• When LED1 on indoor controller board is also off.
Power supply of rated voltage is not supplied to out-

door unit.

Defective outdoor controller circuit board

Power supply of 208/230V is not supplied to indoor

unit.

Defective indoor controller board

Cause

Countermeasure

Check the voltage of outdoor power
supply terminal block (L1, L2).

• When AC 208/230V is not detected,
check the power wiring to outdoor unit
and the breaker.

• When AC 208/230V is detected, check

(below).
Check the voltage between outdoor
terminal block S1 and S2.

• When AC 208/230V is not detected,
—check the fuse on outdoor controller
circuit board.

—check the wiring connection.

• When AC 208/230V is detected, check

(below).
Check the voltage between indoor terminal
block S1 and S2.

• When AC 208/230V is not detected,
check indoor/outdoor unit connecting
wire for miswiring.

• When AC 208/230V is detected, check

(below).
Check the fuse on indoor controller board.
Check the wiring connection.
If no problem are found, indoor controller
board is defective.

(For the separate indoor/outdoor unit power sup-

ply system)

Power supply of 208/230V AC is not supplied to

indoor unit.

The connectors of the optional replacement kit are
not used.

Defective indoor controller board

• When LED1 on indoor controller board is lit.
Mis-setting of refrigerant address for outdoor unit

(There is no unit corresponding to refrigerant
address “0”.)

Check the voltage of indoor power supply
terminal block (L1,L2).

• When AC208/230V is not detected,
check the power supply wiring.

• When AC208/230V is detected, check

(below).
Check that there is no problem in the
method of connecting the connectors.

• When there are problems in the method
of connecting the connectors, connect
the connector correctly referring to
installation manual of an optional kit.

• When there is no problem in the meth­od of connecting the connectors, check

(below).
Check the fuse on indoor controller board.
Check the wiring connection.
If no problem are found, indoor controller
board is defective.

Check again the setting of refrigerant

address for outdoor unit.

Set the refrigerant address to “0”.

(For grouping control system under

which 2 or more outdoor units are
connected, set one of the units to “0”.)
Set refrigerant address using SW1 (3-6)
on outdoor controller circuit board.

21

Phenomena

(2)LED2 on indoor controller board
is blinking.

Note: Refer to the manual of outdoor unit for the detail of remote

controller.

Cause

• When LED1 on indoor controller board is also blinking.
Connection failure of indoor/outdoor unit connecting
wire

• When LED1 is lit.

Miswiring of remote controller wires
Under twin indoor unit system, 2 indoor

wired together.

Refrigerant address for outdoor unit is wrong or not

set.
Under grouping control system, there are some units
whose refrigerant address is 0.

Short-cut of remote controller wires
Defective remote controller

units are

Countermeasure

Check indoor/outdoor unit connecting wire
for connection failure.

Check the connection of remote con­troller wires in case of twin indoor unit
system. When 2 indoor units are wired in
one refrigerant system,
connect remote controller wires to one of
those units.
Check the setting of refrigerant address
in case of grouping control system.

If there are some units whose refrigerant

addresses are 0 in one group, set one of
the units to 0 using SW1 (3-6) on outdoor

controller circuit board.

Remove remote controller wires and

check LED2 on indoor controller board.

• When LED2 is blinking, check the short­cut of remote controller wires.

• When LED2 is lit, connect remote
controller wires again and:

if LED2 is blinking, remote controller
is defective; if LED2 is lit, connection
failure of remote controller terminal

block etc. has returned to normal.

(3)Upward/downward vane
performance failure

(4)Receiver for wireless remote
controller

The vane is not downward during defrosting and heat
preparation and when the thermostat is OFF in HEAT
mode. (Working of COOL protection function)

Vane motor does not rotate.

• Defective vane motor

• Breaking of wire or connection failure of connector

Upward/downward vane does not work.

• The vane is set to fixed position.

Weak batteries of wireless remote controller

Contact failure of connector (CNB) on wireless
remote controller board

(Insert failure)

Contact failure of connector (CN90) on indoor con­troller board (Insert failure)

Contact failure of connector between wireless remote
controller board and indoor controller board

Normal operation (The vane is set to
horizontal regardless of remote control.)

Check

• Check the vane motor. (Refer to “How

• Check for breaking of wire or connec-

Normal operation (Each connector on
vane motor side is disconnected or set­ting the fixed vanes by wired remote
controller.)

Replace batteries of wireless remote con-

troller.

~

Check contact failure of each connector.

When the same trouble occurs even if

(left).

to check the parts”.)

tion failure of connector.

If no problems are found of connector,
replace indoor controller board.

indoor controller board is replaced,
replace wireless remote controller
board.

22

9-5. EMERGENCY OPERATION

9-5-1. When wireless remote controller fails or its battery is exhausted

When the remote controller cannot be used

When the batteries of the remote controller run out or the remote control­ler malfunctions, the emergency operation can be done using the emer­gency buttons on the grille.

DEFROST/STAND BY lamp
Operation lamp

Emergency operation switch (heating)
Emergency operation switch (cooling)
Receiver

Starting operation

• To operate the cooling mode, press the
seconds

.

• To operate the heating mode, press the
seconds

.

* Lighting of the Operation lamp

Note:

• Details of emergency mode are as shown below.

Operation mode COOL HEAT
Set temperature 24°C, 75°F 24°C, 75°F
Fan speed High High
Airflow direction Horizontal Downward 5

Stopping operation

• To stop operation, press the

button

button

means the start of operation.

button or the button .

for more than 2

for more than 2

9-5-2. When wired remote controller or indoor unit microcomputer fails

1.When the wired remote control or the indoor unit microcomputer has failed, but all other components work properly,
if you set the switch (SWE) on the indoor controller board ON, the indoor unit will begin emergency operation.
When emergency operation is activated, the indoor unit operates as follows:
(1)Indoor fan is running at high speed. (2)Drain-up machine is working. (option)

+

Note on the wireless remote control: when the remote control does not function, it is possible to activate.

emergency operation by using the indoor unit emergency operation switch (SW1, SW2 of the wireless signal
receiver board).
However, if the indoor unit microcomputer has failed, it is necessary to proceed with points (2) and (3) below as in the
case of the wired remote controller.

2.When you activate emergency operation of the cooling or heating, you have to set the switch (SWE) on the indoor
controller board and activate emergency operation of the outdoor unit.
For details on how to activate emergency operation of the outdoor unit, refer to the outdoor unit wiring diagram.

3.Before you activate emergency operation, check the following points:
(1)Emergency operation cannot be activated when:

• the outdoor unit malfunctions. • the indoor fan malfunctions.

• when it has detected the malfunction of drain-up machine during self-diagnosing.
(2)Emergency operation becomes continuous only by switching the power source on/off.
ON/OFF on the remote control or temperature control etc. does not function.
(3)Avoid operating for a long time when the outdoor unit begins defrosting while emergency operation
of the heating is activated because it will start to blow cold air.
(4)Emergency cooling should be limited to 10 hours maximum (The indoor unit heat exchanger may freeze).
(5)After emergency operation has been deactivated, set the switches etc. to their original positions.
(6)Movement of the vanes does not work in emergency operation, therefore you have to slowly set them
manually to the appropriate position.

23

9-6. HOW TO CHECK THE PARTS
PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA

Parts name Check points

Room temperature
thermistor (TH1)
Liquid pipe thermistor
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)

Vane motor (MV)

White

Orange

Red

Blue

Yellow

Disconnect the connector then measure the resistance using a tester.
(At the ambient temperature 50"F~86"F)

Normal

4.3k~9.6k

Abnormal

Open or short

(Refer to the next page for a detail.)

Measure the resistance between the terminals using a tester.
(At the ambient temperature of 68°F~86°F)

Connector

Normal

Abnormal
Red - Yellow
Red - Blue
Red - Orange

300

Open or short

Red - White

Drain pump (DP) (Option)

YLW

1

3

YLW

Drain float switch (FS)
(Option)

Moving part

1

2

3

4

i-see sensor
(Option)

4321

43 1

2

Black

Pink

Brown

Blue

Vane motor for
i-see sensor (Option)

White

Orange

Red

Blue

Yellow

Measure the resistance between the terminals using a tester.
(Winding temperature 68°F)

Normal Abnormal

290 Open or short

Measure the resistance between the terminals using a tester.

State of moving part Abnormal

UP

DOWN Other than open

Normal

Short Other than short

Open

Turn on the indoor unit with the black plastic tape on the outside of i-see sensor controller board.
i-see sensor rotates then pull out the connector of motor for i-see sensor.
With electricity being turned on, measure the power voltage between connectors with tester.

Black plastic tape

i-see sensor (At the ambient temperature of 50°F~104°F)

i-see sensor connector

(–)—(+)

(+)—(–) Other than the normal

NOTE : Be careful not to discharge static electricity into electronic device.

Measure the resistance between the terminals using a tester.
(At the ambient temperature of 68°F~86°F)

Connector

Normal
Red - Yellow
Red - Blue
Red - Orange

250

Red - White

Normal
DC 1.857V~ 3.132V Other than the normal

DC 0.939V~ 1.506V

Abnormal

Abnormal

Open or short

Switch

Magnet

Moving
Part

24

9-6-1. Thermistor

<Thermistor Characteristic graph>

Thermistor for
lower temperature

Room temperature thermistor (TH1)
Pipe temperature thermistor/liquid (TH2)

<Thermistor for lower temperature>

50

Condenser/evaporator temperature
thermistor (TH5)

Thermistor R

0=15k ±3%

Fixed number of B=3480 ± 2%

t(

)Rt=15exp { 3480( ) }

1

273+t1273

1

T-32

273+

1.8

0

1

273

40

30

20

Resistance (k )

10

10
20
25
30
40

0

-20 -10 0 10 20 30 40 50

-4 -14 32 50 68 86 104 122 °F

9-6-2. DC Fan motor (fan motor/indoor controller circuit board)

Check method of DC fan motor (fan motor/indoor controller circuit board)

Notes

· High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service.

· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller circuit
Self check
Symptom : The indoor fan cannot turn around.

board and fan motor.)

°C

Temperature

Wiring contact check

Contact of fan motor connector (CNMF)

Is there contact failure?

No

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit

TEST POINT
TEST POINT : VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V

Is the voltage normal?

Replace indoor controller board.

Check the operation END

Replace the fan motor.

: VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC294~325V

No

NG

Yes

Yes

OK

Wiring recovery

board.

Replace the fan motor

Check the operation END

NG

Replace indoor controller board.

OK

25

9-7. TEST POINT DIAGRAM

Indoor controller board

PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA

CN90
Connect to the wireless remote
controller board (CNB)

CN4Y
i-see sensor (option)

CN6Y
sensor motor (option)

LED2
Power supply (R.B)

CN4F
Drain float switch (FS)
(option)

CN44
Pipe temperature
thermistor

- : Liquid (TH2)
- : Cond./Eva. (TH5)

CN20
Room temperature
thermistor (TH1)

LED1
Power supply (I.B)

CN30
Connector (LLC)

LED3
Transmission
(Indoor/outdoor)

CNV
Vane motor output (MV)
12V pulse output

SW1
Model selection

SW2
Capacity setting

Jumper wire J41,J42
Pair No. setting for wireless
remote controller

CN2L
Connector (LOSSNAY)

SWE
Emergency operation

CN51
Connector (Centrally control)

CN41
Connector

CN24
Connector (Back-up heating)

CN22
Connect to the terminal
block (TB5)
(Remote controller con­necting wire)

(HA terminal-A)

(10.4~14.6V DC)

CNMF
Fan motor

-: DC 294~325V
-: DC15V

CNP
Drain-pump output (DP)
(208/230V AC) (option)

CN3C
Transmission
(Indoor/outdoor)
(0~24V DC)

VCC: Voltage between pins of
C955 15VDC
(Same as (+)–(-) of CNMF)

CN01
Connect to the Terminal Block
(TB4)
(Indoor/outdoor connecting line)
Between  and 
208/230V AC

FUSE

6.3A /250V

26

9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE

Each function is controlled by the dip switch and the jumper wire on control P.C. board.
SW1 and SW2 are equipped only for service parts.
Model setting and capacity setting are memorized in the nonvolatile memory of the control P.C. board of
the unit.

(Marks in the table below) Jumper wire ( : Short : Open)

Jumper wire

SW1

SW2

J41
J42

Functions

Model
settings

Capacity
settings

Pair number
setting with
wireless
remote
controller

Setting by the dip switch and jumper wire

For service board

12345

MODELS

PCA-A24KA

ON

OFF

Service board

1 2 3 4 5

ON
OFF

1 2 3 4 5

PCA-A30KA

ON
OFF

1 2 3 4 5

PCA-A36KA

ON
OFF

PCA-A42KA

1 2 3 4 5

ON
OFF

Wireless remote

controller setting

0
1
2

3 ~ 9

Control PCB setting

J41 J42

Remarks

<Initial setting>
Wireless remote controller: 0
Control PCB: (for both J41 and J42)
Four pair number settings are supported.
The pair number settings of the wireless remote
controller and indoor control PCB (J41/J42) are
given in the table on the left.
(' ' in the table indicates the jumper line is disco­nnected.)

JP1

JP3

Unit type
setting

Indoor
controller
board type

Model

Without TH5

With TH5

Indoor controller board type

setting

JP1

For product
Spare parts

There is no jumper (JP1) because these models
have the cond./eva. temperature thermistor (TH5).

JP3

27

10

SPECIAL FUNCTION

10-1. Rotation Function (and back-up function, 2nd stage cut-in function)

10-1-1. Operation

(1) Rotation function (and Back-up function)

Outline of functions

· Main and sub units operate alternately according to the interval of rotation setting.
w Main and sub unit should be set by refrigerant address. (Outdoor Dip switch setting)

Refrigerant address "00" Main unit
Refrigerant address "01" Sub unit

· When error occurs to one unit, another unit will start operation. (Back-up function)

System constraint

· This function is available only by the grouping control system (INDOOR UNIT: OUTDOOR UNIT=1:1) of 2 refrigerant
groups. (Refer to Fig. 1)

· Main indoor unit should be connected for wired remote controller and the transmission line (TB5) for main and sub unit
should also be connected. (Refer to Fig. 1)

(This function cannot be set by wireless remote controller.)

· Set refrigerant address of each unit. (Dip switch on the outdoor unit ··· Refrigerant address 00/01)

Operation pattern

[Back-up function only]··· Request code number "312"

Start operation

Main

unit

IC-1

Sub

unit

IC-2



[Rotation function] & [Back-up function]··· Request code number "313~318"

Start operation

Main

unit

IC-1

Sub

unit

IC-2

(Ex:When the request code number is "313", each unit operates alternately in daily cycle.)

Run

Stop

Main Sub Sub Main Main Sub

Run

Stop

1~28 days 1~28 days

Error occurs on main unit.
Main Sub

Abnormal condition

Run

Stop

Run

Run

Stop Run

Error occurs on main unit.

Abnormal condition

Main
unit

2

Refrigerant address
"00"

OC-1

3(2)

IC-1

2

RC

Fig. 1

OC : Outdoor unit
IC : Indoor unit
RC : Wired remote controller

Refrigerant address
"01"

OC-2

Sub

3(2)

unit

IC-2

Note:

· When the uint is restarted to operate after turning off the power or OFF operation, the unit which was operating will start oper­ation.

· To operate the main unit, refer to the 10-1-2. and set the request code No. which is not the same as the current one, and set
again the former request code No.

(2) 2nd stage cut-in function

Outline of functions

· When the 1st unit can NOT supply with sufficient capacity for exceptionally high-demand conditions and the actual room
temperature reaches set point *, the 2nd unit starts operation in conjunction with the 1st unit.

· Once the actual room temperature goes down to 4degrees C (7.5 degrees F) below set point*, the 2nd unit stops operation
automatically.
(* set point = set temperature by R/C (remote controller) + 4, 6, 8:(7.5, 10.8, 14.4°F) (selectable))

· Number of operating units is determined according to the room temperature and set point.

· When room temperature becomes higher than set point, standby unit starts. (2 units operation)

· When room temperature falls below set point -4:(-7.5°F), standby unit stops. (1 unit operation)

2828

System constraint

· This function is available only in cooling mode.
Ex.) Set temp. by R/C = 20:(68°F)

Set point = 26:(79°F)
When request code number is “323”.

26: 2nd unit Cut-in

(79°F)

4 degree C

(7.5 degreeF)

22: 2nd unit Cut-out

(71.5°F)

[2nd stage cut-in function]··· Request code number "322~324"

Start operation Sub unit start operation

Main

unit

IC-1

Sub

unit

IC-2

Room temp. Set point

Run

Stop StopRun

20:

(68°F)

10-1-2. How to set rotation function (Back-up function, 2nd stage cut-in function)

You can set these functions by wired remote controller.(Maintenance monitor)

NOTE

Both main and sub unit should be set in same setting.
Every time replacing indoor controller board for servicing, the function should be set again.

(1) Request Code List
Rotation setting

Setting No.
(Request code)

No.1
(310)

No.2
(311)

No.3
(312)

No.4
(313)

No.5
(314)

No.6
(315)

No.7
(316)

No.8
(317)

No.9
(318)

Setting contents

Monitoring the request code of current setting.

Rotation and Back-up OFF (Normal group control operation)

Back-up function only
Rotation ON (Alternating interval = 1day) and back up function
Rotation ON (Alternating interval = 3day) and back up function
Rotation ON (Alternating interval = 5day) and back up function
Rotation ON (Alternating interval = 7day) and back up function
Rotation ON (Alternating interval = 14day) and back up function
Rotation ON (Alternating interval = 28day) and back up function

Initial
setting

Room temp. < Set point -4(-7.5°F)

Sub unit stop

2nd stage cut-in setting

Setting No.
(Request code)

No.1
(320)

No.2
(321)

No.3
(322)

No.4
(323)

No.5
(324)

Monitoring the request code of current setting.

Cut-in Function ON(Set point = Set temp.+ 4°C(7.5°F))

Cut-in Function ON(Set point = Set temp.+ 6°C(10.8°F))

Cut-in Function ON(Set point = Set temp.+ 8°C(14.4°F))

Setting contents

Cut-in function OFF

Initial
setting

2929

(2) Setting method of each function by wired remote controller





B: Refrigerant address
C: Data display area
D: Request code display area

















1. Stop operation().

2. Press the button () for 3 seconds so that [Maintenance mode] appears on the screen ().

TEST

After a while, [00] appears in the refrigerant address number display area.(at  )

3. Press the button () for 3 seconds to switch to [Maintenance monitor].

CHECK

Note) It is not possible to switch to [Maintenance monitor] during data request in maintenance mode

(i.e., while “----” is blinking) since no buttons are operative.

[----] appears on the screen () when [Maintenance monitor] is activated.
(The display () now allows you to set a request code No.)

4. Press the [TEMP ( and )] buttons () to select the desired refrigerant address.

[ScreenB]

  

5. Press the [CLOCK ( and )] buttons () to set the desired request code No.(“311~318”, “321~324”)

6. Press the button () to perform function setting.

FILTER

If above setting operations are done correctly, "Request code number" will appear in data display area.()
[Example: When the "311" of "Request code number" is set, [311] appears on the screen.()]

[Refererence]
You can check current "request code number" setting by setting the "request code number"(“310” or “320”) and
pressing the button.()

FILTER

[Example: When the current setting is "Setting No.2(Request code 311)", [311] appears on the screen.()]

7. To return to normal mode, press the button ().

10-2. BACK-UP HEATING FUNCTION (CN24)

10-2-1. Operation

Outline of functions

The back-up heater signal is sent out according to the tempera­ture difference between indoor room temperature and set tem­perature. This function is available only in heating operation.

ON/OFF

Temperature difference

(Z=Set temp. - Room temp.)

1

2

3

Z 0˚C(˚F)

0 < Z < 2.5˚C(4.5˚F)

2.5˚C(4.5˚F) Z

Back-up heater

signal output

OFF

Keeping condition

ON

10-2-2. How to connect

When connecting to the connector CN24 of the indoor unit, use
PAC-SE56RA-E(optional parts).

Z0 2.5˚C(4.5˚F)

ON

OFF

30

11

DISASSEMBLY PROCEDURE

PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA

OPERATING PROCEDURE

1. Removing the air intake grille

(1)

Slide the air intake grille holding knobs (at 2 or 3 loca­tions) to the rear to open the air intake grille. (See Figure 1)

(2) While the air intake grille left open, push the stoppers

on the rear hinges (at 2 or 3 locations) to pull out the air
intake grille. (See Figure 2)

Figure 2

hinges

Pull out the air intake grille

2.

Removing the indoor controller board and the electrical box

(1) Remove the air intake grille. (See Figure 1,2)
(2) Remove the screw from the beam and remove the

beam. (See Photo 1)

(3) Remove 2 screws from the electrical cover, and remove

the electrical cover.

(4) Remove 2 screws from the electrical box and pull the

electrical box downward.

Temporarily secure the electrical box using 2 hooks in

the back of electrical box.

(5) Disconnect the connectors on the indoor controller

board.

[Removing the electrical box]
(6) Disconnect the wires from the terminal blocks and pull

out the electrical box. (See Photo 2)

PHOTOS & ILLUSTRATIONS

Figure 1

Air intake grille

Air intake grille
holding knobs

Photo 1

Electrical cover

Photo 2

Be careful when removing heavy parts.

(Photo: PCA-A36KA)

slide

Beam

Electrical cover
fixing screws

[Removing the indoor controller board]
(6) Remove the 6 supports from the indoor controller board

and remove the indoor controller board. (See Photo 3)

31

Electrical box

Photo 3

Room temperature
thermistor (TH21)

Electrical box fixing screw

Indoor controller
board (I.B.)

Terminal blocks
(TB4) (TB5)

OPERATING PROCEDURE

PHOTOS & ILLUSTRATIONS

3. Removing the room temperature thermistor (TH1)

(1) Remove the air intake grille. (See Figure 1,2)
(2) Remove the screw from the beam and remove the beam.

(See Photo 1)

(3) Remove 2 screws from the electrical cover, and remove

the electrical cover.

(4) Remove 2 screws from the electrical box and pull the

electrical box downward.

Temporarily secure the electrical box using 2 hooks in

the back of electrical box.

(5) Disconnect the connector CN20 (red) from the indoor

controller board.

(6) Remove the sensor holder from the electrical box and

remove the thermistor from the holder.

4. Removing the fan motor and right side fan

(1) Remove the air intake grille. (See Figure 1,2)
(2) Remove the screw from the beam and remove the beam.

(See Photo 1)

(3) Remove 2 screws from the electrical cover, and remove

the electrical cover.

(4) Remove 2 screws from the electrical box and pull the

electrical box downward.

(5) Temporarily secure the electrical box using 2 hooks in

the back of electrical box.

(6) Remove the lower casing while pressing the 4 catches of

the casing (right side of the fan motor). (See Photo 6)

(7) Loosen the 2 set screws (2 hexagon set screws) of con-

necting joint and slide the fan motor to the left. (See

Photo 5)
(8) Remove the screw for motor earth wire. (See Photo 5)
(9) Remove the motor piece (left and right, each 1 screw).

(See Photo 5)
(10) Remove the fan motor and right side fan together.

11

) Loosen the set screw (hexagon set screw) of fan and

(

remove the fan from the shaft. (See Photo 7,8)

Photo 4

Room temperature
thermistor (TH1)

Electrical box

Photo 5

Connecting

joint

Casing

Photo 6

Casing

Catch

Motor piece
fixing screws

Set screws

Casing

Fan motor

Electrical box

Catch

Motor earth wire
fixing screw

Casing

Photo 8

Hexagon set screw

Photo 7

32

Catch

Hole for driver

OPERATING PROCEDURE

PHOTOS & ILLUSTRATIONS

5. Removing the fan (3 connection)

(1) Remove the air intake grille. (See Figure 1,2)
(2) Remove the screw from the beam and remove the beam.

(See Photo 1)

(3) Remove 2 screws from the electrical cover, and remove

the electrical cover.

(4) Remove 2 screws from the electrical box and pull the

electrical box downward.

Temporarily secure the electrical box using 2 hooks in

the back of electrical box.

(5) Remove 2 screws from the left side beam and remove

the beam. (See Photo 9)

(6) Loosen 2 set screws (2 hexagon set screws) of connect-

ing joint. (See Photo 5)

(7) Remove 3 lower casings while pressing each 4 catches

of the casing. (See Photo 6)

(8) Remove the 4 screws from the bearing support. (See

Photo 10)

(9) Slide the connecting joint to the left and remove the fans

and shaft together. (See Photo 11)

10

) Remove the fan from the shaft. (See Photo 7,8 )

(

Photo 11

Fan (3 connection)

Photo 9

Photo 10

Bearing sup­port fixing
screws

Beam

Bearing support

Shaft

Bearing support

Shaft

6. Removing the side panel

(1) Remove the air intake grille. (See Figure 1,2)
(2) Remove the screw from the side panel, and remove the

side panel by sliding the panel to the front.

Figure 3

Side panel
(Right)

Sliding the panel
to the front

Side panel
(Left)

Screw

33

OPERATING PROCEDURE

7. Removing the vane motor

(1) Remove the air intake. (See Figure 1,2)
(2) Remove the right side panel. (See Figure 3)
(3) Remove the connector of vane motor.
(4) Remove 2 screws of vane motor cover, then remove

vane motor.

PHOTOS & ILLUSTRATIONS

Photo 12

Vane motor and cover

Screws

Connector

8. Removing the under panel

(1) Remove the air intake grille. (See Figure 1,2)
(2) Remove the left and right side panels. (See Figure 3)
(3) Remove the beam. (See Photo 1)
(4) Remove the electrical cover. (See Photo 1)
(5) Pull the electrical box downward. (See Photo 2)
(6) (Wireless remote controller receiver type only)
Disconnect the connector CNB from the PCB for wire-

less remote controller and remove the clamp and strap

for wires.
(7) Remove 8 screws from the under panel.
(8) Move the under panel forward by about 7/16in. (10mm)

and remove the under panel.

9. Removing the drain pan

(1) Remove the air intake grille. (See Figure 1,2)
(2) Remove the side panel (right and left). (See Figure 3)
(3) Remove the under panel. (See Photo 13)
Remove the screws of the right and left side drain pan.
(See Photo 14)
(4) Remove 2 insulation in centre of the drain pan, and after

removing 2 screws with washer, remove the drain pan.
(See Photo 15,16)

(Note)

Please be aware that there might be some drainage left in
the drain pan when you remove the drain pan.

Photo 16

Photo 13

Under panel fixing
screws

Photo 14

Drain pan fix­ing screws
(left and right
each 1 screw)

Photo 15

Vane

Pipe cover fixing screws

Drain pan

Insulations

Screw with

washer

(2 locations)

34

OPERATING PROCEDURE

10. Removing the thermistors/Liquid pipe (TH2) and con­denser/evaporator (TH5)

(1) Remove the air intake grille. (See Figure 1, 2)
(2) Remove the left and right side panels. (See Figure 3)
(3) Remove the under panel. (See Photo 14)
(4) Remove the drain pan. (See Photo 15, 16, 17)
(5) Disconnect the connector CN44 (white) from the indoor

controller board.

(6) Remove 6 screws from the pipe cover and remove the

pipe cover. (See Photo 15, 18)

(7)

Remove the fastener for wires and remove the thermistors
(TH2 and TH5) from each holder. (See Photo 19)

PHOTOS & ILLUSTRATIONS

Photo 18

Pipe cover fixing
screws

Pipe cover

Photo 19

Condenser/evaporator
tepmertature thermistor
(TH5)

Liquid pipe
temperature
thermistor (TH2)

Pipe cover fix-

ing screws

(See Photo 15)

Fastener

11. Removing the guide vane

(1) Remove the intake grille. (See Figure 1,2)
(2) Remove the side panel (right and left). (See Figure 3)
(3) Remove the under panel. (See Photo 13)
(4) Remove the drain pan. (See Photo 14, 15,16)
(5) Remove the screw from the guide vane, then remove

the guide vane.

12. Removing the Auto vane

(1) Remove the intake grille. (See Figure 1,2)
(2) Remove the right side panel. (See Figure 3)
(3) Remove the vane motor and cover. (See Photo 12)
(4) Slide the auto vane to the vane motor side.
(5) Remove 2 axes from each vane support pushing the

vane support to the vane sleeve side.

Photo 19

Photo 20

Vane sleeve

Screw

Drain pan

Guide vane

Vane support Vane

Vane motor side

35

OPERATING PROCEDURE

13. Removing the heat exchanger

(1) Remove the air intake grille. (See Figure 1, 2)
(2) Remove the beam. (See Photo 1)
(3) Remove the electrical cover. (See Photo 1)
(4) Pull the electrical box downward. (See Photo 2)
(5) Remove the left and right side panels. (See Figure 3)
(6) Remove the under panel. (See Photo 14)
(7) Remove the drain pan. (See Photo 15,16,17)
(8) Remove the pipe cover. (See Photo 18)
(9) Remove the pipe thermistors (TH2 and TH5) from each

holder. (See Photo 19)

10

) Remove the pipe band fixing screw and remove the

(

pipe band. (See Photo 22)

(11) Remove 2 screws from the heat exchanger and

remove the heat exchanger.

PHOTOS & ILLUSTRATIONS

Photo 22

Heat exchanger

Pipe band

Pipe band fixing

screw

Photo 23

Heat exchanger

fixing screws

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

CCopyright 2009 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed in Mar. 2009 No.OCH455 PDF 7
Made in Japan

Heat exchanger Vane

New publication, effective Mar. 2009
Specifications subject to change without notice