Mitsubishi PLA-A36AA, PLA-A30AA, PLA-A24AA, PLA-A12AA User Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

ON/OFF TEMP

ON/OFF

TEMP.

SPLIT-TYPE, AIR CONDITIONERS

SERVICE MANUAL

Indoor unit
[Model names] [Service Ref.]

PLA-A12AA

PLA-A12AA PLA-A12AA1

June 2007

No. OC370

REVISED EDITION-B

Revision:

• WIRING DIAGRAM has been
changed in REVISED EDI­TION-B.

• Some descriptions have been
modified.

PLA-A18AA

PLA-A24AA

PLA-A30AA

PLA-A36AA

PLA-A42AA

Model name
indication

PLA-A18AA PLA-A18AA1
PLA-A24AA PLA-A24AA1
PLA-A30AA PLA-A30AA1
PLA-A36AA PLA-A36AA1
PLA-A42AA PLA-A42AA1

CONTENTS

1. TECHNICAL CHANGES ··································2

2. REFERENCE MANUAL······································2

3. SAFETY PRECAUTION···································3

4. PART NAMES AND FUNCTIONS ···················5

5. SPECIFICATIONS············································8

6. NOISE CRITERION CURVES························10

7. OUTLINES AND DIMENSIONS·····················11

8.

WIRING DIAGRAM

INDOOR UNIT

9.

REFRIGERANT SYSTEM DIAGRAM

10. TROUBLESHOOTING ···································14

11. DISASSEMBLY PROCEDURE ·······················30

12. PARTS LIST···················································33

13. RoHS PARTS LIST ········································38

• Please void OC370 REVISED
EDITION-A.

NOTE:

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

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

• For servicing RoHS compliant
products, refer to the RoHS
PARTS LIST.

············································12

··················13

WIRELESS REMOTE

CONTROLLER

WIRED REMOTE

CONTROLLER

3 3 2 2 3

1

Series (Outdoor unit)

PUZ-A·NHA(-BS)
PUY-A·NHA(-BS)

Manual No.

OCS04

TECHNICAL CHANGES

PLA-A12AA ➔ PLA-A12AA1

PLA-A18AA ➔ PLA-A18AA1
PLA-A24AA ➔ PLA-A24AA1
PLA-A30AA ➔ PLA-A30AA1
PLA-A36AA ➔ PLA-A36AA1
PLA-A42AA ➔ PLA-A42AA1

• Indoor controller board has been changed.

2

REFERENCE MANUAL

2-1. OUTDOOR UNIT SERVICE MANUAL

Service Ref.

PUZ-A18/24/30/36/42NHA
PUZ-A18/24/30/36/42NHA-BS
PUY-A12/18/24/30/36/42NHA
PUY-A12/18/24/30/36/42NHA

(1)
(1)

-BS

2-2. TECHNICAL DATA BOOK

Service Manual No.

OC367

2

3

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.

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

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

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.

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.

Keep the tools with care.

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

Do not use a charging cylinder.

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

Flare tool

Electronic refrigerant
charging scale

Vacuum pump adaptor

Size adjustment gauge

Gauge manifold

Torque wrench

Gas leak detector

Charge hose

Tools for R410A

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

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

If large amount of mineral oil enters, that can cause deterio

-

ration of refrigerant oil etc.

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

SAFETY PRECAUTION

3-1. ALWAYS OBSERVE FOR SAFETY

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

3-2. CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilising refrigerant R410A

[1] Cautions for service

(1) Perform service after collecting the refrigerant left in the 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.

3

Gravimeter

Unit

[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.)

[3] Service tools

Use the below service tools as exclusive tools for R410A refrigerant.

No. 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)

8 Refrigerant recovery equipment

specifications

Cylinder with syphon

. (UNF1/2)

4

4

Auto Air Swing Vane
Disperses airflow up and
down and adjusts the angle
of airflow direction.

Grille

Filter
Removes dust and pollutants
from intake air.

Horizontal Air Outlet
Sets horizontal airflow automatically
during cooling or dehumidifying.

Air Intake
Intakes air from room.

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

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)

T o return operation
number

Ventilation button
( Operation button)

To go to next operation
number

Built-in temperature sensor

PART NAMES AND FUNCTIONS

● Indoor Unit

● Wired remote controller

TEMP.

MENU

MONITOR/SET

BACK DAY

PAR-21MAA

ON/OFF

ON/OFF

CLOCK

OPERATION

5

FILTER

CHECK

CLEAR

TEST

● Wired remote controller

●

●

˚F˚C

˚F˚C

ERROR CODE

AFTER

TIMER

TIME SUN MON TUE WED THU FRI SAT

ON
OFF

Hr
AFTER

FILTER

FUNCTION

ONLY1Hr.

WEEKLY

SIMPLE

AUTO OFF

Note:

“PLEASE WAIT” message
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 A V AILABLE” 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.

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.

“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.

Up/Down Air Direction indica­tor

Shows the direction of the
outcoming airflow.

“One Hour Only” indicator

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.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in
Ventilation mode.

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.

6

ON/OFF TEMP

FAN

VANE

TEST RUN

AUTO STOP

AUTO START

h

min

LOUVER

MODE

CHECK

RESETSET CLOCK

MODEL

SELECT

NOT AVAILABLE

SWING

CHECK

FAN

TEST

RUN

˚F
˚C

AMPMSTOP

START

AMPM

COOL

DRY

AUTO

FAN

HEAT

VANE CONTROL button

Changes the air flow direction.

CLOCK button

RESET button

SET button

ON/OFF button

The unit is turned ON and OFF alternately
each time the button is pressed.

LOUVER button

Changes left / right airflow direction.
(Not available for this model.)

MODE SELECT button

Switches the operation mode between
COOLING/DRY/FAN/HEATING and AUTO
mode.

wIn case the outdoor unit is cooling only
type, the heating and auto mode are not

available.

CHECK-TEST RUN button

Performs an inspection check or test opera­tion.
Do not use it for normal operation.

FAN SPEED SELECT button

Changes the fan speed.

TIMER display

Displays when in timer operation or when
setting timer.

button

Sets any desired room temperature.

CLOCK display

Displays the current time.

“ ” “ ” display

Displays the order of timer operation.

“ ” “ ” display

Displays whether timer is on or off.

Buttons used to set the “hour and minute” of
the current time and timer settings.

"h" and "min" buttons

Temperature setting display

indicates the desired temperature setting
which is set.

display

Displays selected fan speed.

display

The vertical direction of air flow is indicated.

display

Blinks when model is selected.

display

Lights up while the signal is transmitted to
the indoor unit when the button is pressed.

display

Indicate that the unit is being checked or
test-run.

OPERATION MODE display

OPERATION MODE display
Indicates which operation mode is in effect.

TIMER CONTROL buttons

AUTO STOP (OFF timer): when this switch
is set, the air conditioner will be au­tomatically stopped at the preset time.
AUTO START (ON timer): when this switch
is set, the air conditioner will be automatical­ly started at the preset time.

MODEL SELECT

CHECK

TEST RUN

● Wireless remote controller

7

Single phase,60Hz, 208/230V

15

1

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o 1

0.070

0.79
Dry: 15-16-18-20(530-570-640-710)
Wet:14-15-17-19(490-530-600-670)

0(direct blow)

–

Remote controller & built-in

28-30-32-34

32 (1-1/4)

PLA-A18AA/ PLA-A18AA

1

UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT

: 840 (33-1/16)

PANEL : 950 (37-3/8)

UNIT

: 258 (10-3/16)

PANEL : 30 (1-3/16)

UNIT

: 24 (53)

PANEL: 5 (11)

A
A

kW

F.L.A.

K/min(CFM)

Pa(mmAq)

kW

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

kg(lbs)

Service Ref.

Power supply (phase, cycle, voltage)

Max. Fuse Size

Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan Fan (drive) o No.

Fan motor output

Fan motor

Airflow (Low-Medium2-Medium1-High)

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

Weight

W

D
H

INDOOR UNIT

Single phase,60Hz, 208/230V

15

1

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o 1

0.070

0.79

Dry: 11-12-13-14(390-420-460-490)

Wet: 10-11-12-13(350-380-420-450)

0(direct blow)

–

Remote controller & built-in

27-28-29-31

32 (1-1/4)

A
A

kW

F.L.A.

K/min(CFM)

Pa(mmAq)

kW

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

kg(lbs)

Service Ref.

Power supply (phase, cycle, voltage)

Max. Fuse Size

Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan Fan (drive) o No.

Fan motor output

Fan motor

Airflow (Low-Medium2-Medium1-High)

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

Weight

W
D
H

INDOOR UNIT

PLA-A12AA/ PLA-A12AA1

UNIT : 840 (33-1/16)

PANEL : 950 (37-3/8)

UNIT : 840 (33-1/16)

PANEL : 950 (37-3/8)

UNIT : 258 (10-3/16)

PANEL : 30 (1-3/16)

UNIT : 22 (49)

PANEL: 5 (11)

5

PLA-A24AA/ PLA-A24AA1

UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 258 (10-3/16) PANEL : 30 (1-3/16)

UNIT : 24 (53) PANEL: 5 (11)

Single phase,60Hz, 208/230V

15

1

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o 1

0.070

0.79

Dry: 15-16-18-20(530-570-640-710)

Wet: 14-15-17-19(490-530-600-670)

0(direct blow)

–

Remote controller & built-in

28-30-32-34

32(1-1/4)

A
A

kW

F.L.A.

K/min(CFM)

Pa(mmAq)

kW

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

kg(lbs)

Service Ref.

Power supply (phase, cycle, voltage)

Max. Fuse Size

Min. Circuit Ampacity
External finish (Panel)
Heat exchanger
Fan Fan (drive) o No.

Fan motor output

Fan motor

Airflow (Low-Medium2-Medium1-High)

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

Weight

W

D
H

INDOOR UNIT

SPECIFICATIONS

8

Service Ref.

Power supply (phase, cycle, voltage)

External finish (Panel)
Heat exchanger
Fan Fan (drive) o No.

INDOOR UNIT

Booster heater
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.

K/min(CFM)

Pa(mmAq)

kW

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

kg(lbs)

PLA-A30AA/ PLA-A30AA1

Single phase,60Hz, 208/230V

15

1

Munsell 0.70Y 8.59/0.97

Plate fin coil

Turbo fan (direct) o 1

0.070

0.79

Dry: 15-16-18-20(530-570-640-710)

Wet: 14-15-17-19(490-530-600-670)

0(direct blow)

–

Remote controller & built-in

28-30-32-34

32(1-1/4)

UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 258 (10-3/16) PANEL : 30 (1-3/16)

UNIT : 24 (53) PANEL: 5 (11)

Service Ref.

Power supply (phase, cycle, voltage)

External finish (Panel)
Heat exchanger
Fan Fan (drive) o No.

INDOOR UNIT

Booster heater
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 (Panel)
Heat exchanger
Fan Fan (drive) o No.

INDOOR UNIT

Booster heater
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.

K/min(CFM)

Pa(mmAq)

kW

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

kg(lbs)

A
A

kW

F.L.A.

K/min(CFM)

Pa(mmAq)

kW

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

kg(lbs)

PLA-A36AA/ PLA-A36AA

Single phase,60Hz, 208/230V

Munsell 0.70Y 8.59/0.97

Turbo fan (direct) o 1

Dry: 20-23-26-28(710-810-920-990)

Wet: 19-22-25-27(670-770-880-950)

Remote controller & built-in

UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)

UNIT : 298 (11-3/4) PANEL : 30 (1-3/16)

UNIT : 30 (66) PANEL : 5 (11)

PLA-A42AA/ PLA-A42AA

Single phase,60Hz, 208/230V

Munsell 0.70Y 8.59/0.97

Turbo fan (direct) o 1

Dry: 20-23-26-28(710-810-920-990)
Wet: 19-22-25-27(670-770-880-950)

Remote controller & built-in

UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)
UNIT : 840 (33-1/16) PANEL : 950 (37-3/8)

UNIT : 298 (11-3/4) PANEL : 30 (1-3/16)

UNIT : 30 (66)

15

2

Plate fin coil

0.110

1.25

0(direct blow)

–

33-36-39-41

32(1-1/4)

15

2

Plate fin coil

0.110

1.25

0(direct blow)

–

33-36-39-41

32(1-1/4)

P

1

1

ANEL : 5 (11)

9

6

PLA-A12AA
PLA-A12AA

1

NOTCH SPL(dB) LINE

High
Medium1
Medium2

Low

31
29
28
27

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

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

BAND CENTER FREQUENCIES, Hz

PLA-A36AA
PLA-A42AA
PLA-A36AA

1

PLA-A42AA1

NOTCH SPL(dB) LINE

41
39
36
33

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

High
Medium1
Medium2

Low

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

PLA-A18AA PLA-A18AA

1

PLA-A24AA PLA-A24AA

1

PLA-A30AA PLA-A30AA

1

NOTCH SPL(dB) LINE

34
32
30
28

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

High
Medium1
Medium2

Low

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

UNIT

5 ft

MICROPHONE

CEILING

NOISE CRITERION CURVES

10

7

1-1/2(37)

14-23/32(374)

11/16 (17 )

2-3/8(60)

11-1/4(286)

1-31/32~2-3/4

4-1/8(105)

B

A

7-15/32(190)

D

3-5/16
(84)

3-5/32
(80)

5/8F

3/8F

24/30/36/4212/18

1 Liquid pipe

1/2F

1/4F

MODEL

2 Gas pipe

PLA-A42AA(1)

PLA-A36AA(1)

9-1/2
(241)

10-3/16

(258)

Models

PLA-A12/18/24/30AA(1)

3-1/2
(89)

(298)

(281)

A

B

11-1/16

11-3/4

C

(20~45)

(20~45)

(50~70)

2-[1-1/16(27)

3-[1/8([2.8)

Fresh air intake

Suspension bolt pitch

Ceiling hole

Feeding hole
(Drain pump)

Drain pipe
O.D.[1-1/4([32) connection
(VP-25)

25/32~1-25/32(20~45)

25/32~1-25/32(20~45)

33-27/32~35-13/16(860~910)

D

C

[5-29/32([150)

14-[1/8([2.8)

[6-7/8([175)

[4-29/32([125)

[3-15/16([100)

31-7/8(810)

33-27/32~35-13/16(860~910)

25/32~1-25/3225/32~1-25/32

6-1/4(159)

Grille

33-1/16(840)

7-3/4(197)

2(51)

3-1/32(77)

2

1

14-23/32(374)

2-3/8(60)

11-1/4(286)

4-1/8(105)

B

A

7-15/32(190)

Ceiling hole

Feeding hole
(Drain pump)

Drain pipe
(VP-25)

D

31-7/8(810)

6-1/4(159)

Grille

33-1/16(840)

7-3/4(197)

2

1

+5

0

0

14-23/32(374)

2-3/8(60)

11-1/4(286)

4-1/8(105)

B

A

7-15/32(190)

High efficiency filter
& Fresh air intake casement(option)

Feeding hole
(Drain pump)

Drain pipe
(VP-25)

D

31-7/8(810)

6-1/4(159)

Grille

33-1/16(840)

7-3/4(197)

2

1

14-23/32(374)

2-3/8(60)

11-1/4(286)

4-1/8(105)

B

A

7-15/32(190)

Feeding hole
(Drain pump)

Ceiling surface

Drain pipe
(VP-25)

D

31-7/8(810)

6-1/4(159)

Grille

33-1/16(840)

7-3/4(197)

2

1

+5

0

+3/16

0

11/16 (17 )

+3/16 0+3/16 0+3/16 0+3/16

0

+3/16

9-3/4(248)

1-3/4(45)

14-23/32(374)

5-5/16(135)

2-3/8(60)

11-1/4(286)

4-1/8(105)

1-3/16(30)

B

A

7-15/32(190)

Unit : inch(mm)

Wiring entrance holes

(Cut out hole)

Detail drawing of fresh air intake

(Cut out hole)

Burring hole

Ceiling surface

Branch duct hole

Branch duct hole

Branch duct hole

Suspension bolt pitch

Ceiling hole

Terminal block

Suspension bolt

lower edge

Feeding hole
(Drain pump)

Drain pipe
(VP-25)

Suspension bolt
W3/8(M10)

Drain hole

Vane motor

M

M

M

M

Air intake hole

Air outlet hole

Air outlet hole

6-1/4(159)

6-1/4(159)

1(26)

23-13/16(605)

33-1/16(840)

D

3-27/32(98)

7-9/16(192)

6-3/32(155)

6-9/16(167)

3-15/16(100)

5-1/8(130)

3-17/32(90)

3-15/16(100) 3-15/16(100)

3-17/32(90)

13-25/32(350)

Burring hole

6-7/32(158)

Auto vane

31-7/8(810)

6-1/4(159)

6-1/4(159)

Air intake hole

Grille

33-1/16(840)

7-3/4(197)

37-3/8(950)

37-3/8(950)

22-23/32(577)

16-3/16(411)

16-3/16(411)

6-11/16(170)

5-1/2(140)

Air intake grille

3-1/32(77)

2(51)

22-23/32(577)

2

1

INDOOR UNIT
PLA-A12AA PLA-A18AA PLA-A24AA
PLA-A30AA PLA-A36AA PLA-A42AA

OUTLINES AND DIMENSIONS

PLA-A12AA1 PLA-A18AA1 PLA-A24AA1
PLA-A30AA1 PLA-A36AA1 PLA-A42AA1

Unit : inch(mm)

11

8

I.B

SWE
ON
OFF

SW2 SW1

Refer to tables 1 and 2
for service PCB.

HEATER
CN24

(

YLW

)

D.SENSOR
CN31

(

WHT

)

1 2 3

INTAKE

CN20

(

RED

)

1 2

LIQUID

CN21

(

WHT

)

PIPE

CN29

(

BLK

)

1 2

1 2

REMOCON
CN22

(

BLU

)

1 2

TH5

TH1

DS

TH2

2

1

TB5

R.B

TB6

12

TRANSMISSION WIRES DC12V

LED3 LED2 LED1

CN41 CN2L

CN51

CN32

WIRELESS
CN90

(

WHT

)

VANE
CN6V

(

GRN

)

W.B

BZ

CNB

RU

LED2 LED1

SW2SW1

9

5

5

1 31 2

BLK

BLU

BLU

WHT

BRN

ORN

POWER
CN2D
(WHT)

A-CONTROL
CN3C
(BLU)

1 31 31 31 3

ZNR

FUSE

WHT

RED

YLW

YLW

YLW

YLW

YLW

ORN

POWER

CNDK
(RED)

POWER

CND

(ORN)

D.U.M

CNP

(BLU)

DP

D.HEATER

CNC

(RED)

X4 X1

MV

GRILLE

FAN

(

WHT

)

1 3 5

1 2 3

1 2 3 6 7 4 8 9 5

10

BLK

WHT

RED

C

MF

X4

X1

BCR

1 2 3

3
2
1

CNSK
(RED)

2
1

CN2S
(WHT)

DC

13.1V

P.B

TO
OUTDOOR
UNIT

TB4

S1
S2
S3

YLW
ORN

YLW
ORN

BRN

5

5

MV5MV5MV

H2

Please set the voltage using the
remote controller.
For the setting method, please refer to
the indoor unit Installation Manual.

SW1

SW2

Table 1

Table 2

Service board

Service board

MODELS
PLA-A,AA

1 2 3 4 5

ON
OFF

1 2 3 4 5

ON
OFF

MODELS

PLA-A12AA

Service board

1 2 3 4 5

ON
OFF

MODELS

PLA-A30AA

1 2 3 4 5

ON
OFF

PLA-A18AA

1 2 3 4 5

ON
OFF

PLA-A36AA

1 2 3 4 5

ON
OFF

PLA-A24AA

1 2 3 4 5

ON
OFF

PLA-A42AA

w1

NOTES:

1. Symbols used in wiring diagram above are, : Connector, : Terminal (block).

2. Indoor and outdoor connecting wires have polarities, 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 diagram for servicing.

4. This diagram shows the wiring of Indoor and Outdoor connecting wires
(specification of 230V), adopting superimposed system of power and signal.

w1. Use copper supply wires.

Check code

Symptom

Check code

Symptom

P1 Abnormality of room temperature thermistor(TH1)

Fb

Abnormality of indoor controller board

U*, F*

Abnormality in outdoor unit. Refer to outdoor unit wiring diagram.

FFFF

No corresponding unit

————

No trouble generated in the past

P2 Abnormality of pipe temperature thermistor / Liquid(TH2)
P4 Abnormality of drain sensor(DS)
P5 Malfunction of drain-up machine
P6 Freezing / overheating protection is working.
P8 Abnormality of pipe temperature
P9 Abnormality of pipe temperature thermistor / Cond. / Eva.(TH5)

E0-E5

Abnormality of the signal transmission between remote
controller and indoor unit

E6-EF

Abnormality of the signal transmission between indoor unit and outdoor unit

[Self-diagnosis]

1. For details on how to operate self-diagnosis with the wireless remote control, refer to the technical manuals etc.

2. For the wired remote control : When you quickly press twice the CHECK switch on the remote control,
the unit begins self-diagnosis, and Check Codes generated in the past appear on the display.
For check Codes and Symptoms refer to the table below.

[LEGEND]

P.B

INDOOR POWER BOARD

SYMBOL NAME
I.B

INDOOR CONTROLLER BOARD

FUSE FUSE (6.3A/250V)

ZNR VARISTOR

CN2L CONNECTOR<LOSSNAY>

BCR FAN CONTROL ELEMENT
CN32 CONNECTOR<REMOTE SWITCH>

CN41 CONNECTOR<HA TERMINAL-A>
CN51

CONNECTOR<CENTRALLY CONTROL>

SW1

SWITCH <MODEL SELECTION>wSee Table 1.

SW2

SWITCH <CAPACITY CODE>wSee Table 2.
SWE SWITCH<EMERGENCY OPERATION>
X1 RELAY<DRAIN PUMP>
X4 RELAY<FAN MOTOR>

POWER SUPPLY<R.B>

LED1 POWER SUPPLY<I.B>
LED2

TRANSMISSION<INDOOR-OUTDOOR>LED3

C

CAPACITOR<FAN MOTOR>

SYMBOL NAME

W.B

WIRELESS REMOTE CONTROLLER BOARD

RECEIVING UNIT

BUZZER
LED<RUN INDICATOR >
LED<HOT ADJUST>

SWITCH<HEATING ON/OFF>
SWITCH<COOLING ON/OFF>

FAN MOTOR
VANE MOTOR

MF
MV

DEW PREVENTION HEATER

H2

DRAIN-UP MACHINE

DP

DRAIN SENSOR

DS

TB4

TERMINAL BLOCK<INDOOR/OUTDOOR
CONNECTING LINE>
TERMINAL BLOCK<REMOTE CONTROLLER
TRANSMISSION LINE >
ROOM TEMP.THERMISTOR
<32°F/15kΩ, 77°F/5.2kΩ DETECT>
PIPE TEMP.THERMISTOR/LIQUID
<32°F/15kΩ, 77°F/5.2kΩ DETECT>
COND./EVA.TEMP.THERMISTOR
<32°F/15kΩ, 77°F/5.2kΩ DETECT>

TB5,TB6

TH5

TH1
TH2

WIRED REMOTE CONTROLLER BOARD

R.B

RU

BZ
LED1
LED2

SW1
SW2

NAMESYMBOL

WIRING DIAGRAM

PLA-A12AA PLA-A18AA PLA-A24AA PLA-A30AA PLA-A36AA PLA-A42AA
PLA-A12AA1 PLA-A18AA1 PLA-A24AA1 PLA-A30AA1 PLA-A36AA1 PLA-A42AA1

12

Thermistor TH2
Pipe temperature (Liquid)

Distributor
with strainer (#50)

Thermistor TH5
(Cond./ Eva. temperature)

Thermistor TH1
(Room temperature)

Refrigerant flow in cooling
Refrigerant flow in heating

Strainer (#50)

Strainer (#50)

Heat exchanger

Refrigerant GAS pipe connection
(Flare)

Refrigerant LIQUID pipe connection
(Flare)

9

REFRIGERANT SYSTEM DIAGRAM

PLA-A12AA PLA-A18AA PLA-A24AA PLA-A30AA PLA-A36AA PLA-A42AA
PLA-A12AA1 PLA-A18AA1 PLA-A24AA1 PLA-A30AA1 PLA-A36AA1 PLA-A42AA1

13

10 TROUBLESHOOTING

Unit conditions at service

Error code

Actions to be taken for service (summary)

The inferior phenomenon is
reoccurring.

Displayed

Not displayed

Judge what is wrong and take a corrective action
according to “SELF-DIAGNOSIS ACTION TABLE” (10-3).

Identify the cause of the inferior phenomenon and take
a corrective action according to “TROUBLESHOOTING
BY INFERIOR PHENOMENA ” (10-4).

The inferior phenomenon is
not reoccurring.

Logged

Not logged

1Consider 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
inferior phenomenon occurred, and wiring related.
2Reset error code logs and restart the unit after finishing
service.
3There is no abnormality in electrical components,
controller boards, and remote controller.

1Recheck the abnormal symptom.
2Identify the cause of the inferior phenomenon and take

a corrective action according to “TROUBLESHOOTING
BY INFERIOR PHENOMENA ” (10-4).
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality in electrical components,
controller boards, remote controller etc.

10-1. 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 inferior phenomenon reoccurrence at field are summarized in the table below. Check
the contents below before investigating details.

14