Mitsumi electronic PKA-A12HA4, PKA-A18HA4 User Manual

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

SERVICE MANUAL

Indoor unit
[Model names] [Service Ref.]

PKA-A12HA4

PKA-A18HA4

PKA-A12HA4
PKA-A18HA4

November 2010

No. OCH483

NOTE:

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

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

INDOOR UNIT

TEMP.

WIRED REMOTE

CONTROLLER

ON/OFF

(Option)

COOL

DRY

AUTO

FAN

HEAT

IR WIRELESS REMOTE
CONTROLLER (Option)

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 DIAGRAM

9. TROUBLESHOOTING

10. SPECIAL FUNCTION

11. DISASSEMBLY PROCEDURE

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PARTS CATALOG (OCB483)

33223

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2

3
4

7

8
9

11
12
26
29

1

REFERENCE MANUAL

1-1. OUTDOOR UNIT SERVICE MANUAL

Service Ref. Service Manual No.

PUZ-A18/24/36NHA4
PUZ-A18/24/36NHA4-BS
PUY-A12/18/24/36NHA4
PUY-A12/18/24/36NHA4-BS

Remote controller (Optional parts)

Radio frequency interface Wired remote controller IR wireless remote controller

RF thermostat

OCH481

OCB481

COOL

DRY

AUTO

FAN

HEAT

TEMP.

ON/OFF

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 contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazards to refrigerant cycle.
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.

The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.

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.

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.

[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.

[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

Unit

Gravimeter

[3] Service tools

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

No. Tool name Specifications

Gauge manifold · Only for R410A

1

· Use the existing fitting

· Use high-tension side pressure of 5.3MPa·G or over.

Charge hose · Only for R410A

2

· Use pressure performance of 5.09MPa·G or over.

Electronic scale

3

Gas leak detector

4

Adaptor for reverse flow check

5

Refrigerant charge base

6

Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)

7

Refrigerant recovery equipment

8

· Use the detector for R134a, R407C or R410A.

· Attach on vacuum pump.

· Cylinder with syphon

specifications

. (UNF1/2)

—

—

—

3

PART NAMES AND FUNCTIONS

Indoor unit

Filter

Louver

Air outlet

Air intake

Vane

4

● Wired remote controller (Option)

Display Section

For purposes of this explanation,
all parts of the display are shown.
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

Displays if the airflow is set to
low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in 1 hour,
when 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

Displays 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)

TEMP.

Set Time buttons

Back

Ahead

Timer On/Off button
(Set Day button)

Opening the
cover

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 recoveringfrom 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).

BACK DAY

PAR-21MAA

MENU

MONITOR/SET

CLOCK

ON/OFF

OPERATION

ON/OFF

FILTER

CHECK

TEST

CLEAR

Built-in temperature sensor

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

● IR wireless remote controller (Option)

CHECK

TEST RUN

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

MODEL SELECT

Blinks when model is selected.

display

display

display

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

Temperature setting display

Indicates the desired temperature setting
which is set.

OPERATION MODE display

OPERATION MODE display
Indicates which operation mode is in effect.

display

The vertical direction of airflow is indicated.

display

Displays selected fan speed.

ON/OFF button

The unit is turned ON and OFF alternately

each time the button is pressed.

FAN SPEED SELECT button

Changes the fan speed.

MODE SELECT button

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

In case the outdoor unit is cooling only
type, the heating and auto mode are not
available.

COOL

DRY

AUTO

FAN

HEAT

RUN

MODEL
SELECT

FAN

SWING

NOT AVAILABLE

TEST

CHECK

ON/OFF TEMP

FAN

MODE

CHECK

VAN E

LOUVER

TEST RUN

RESETSET CLOCK

°F
°C

AMPMSTOP

AMPM

START

AUTO STOP

AUTO START

h

min

CLOCK display

Displays the current time.

TIMER display

Displays when in timer operation or when
setting timer.

“ ” “ ” display

Displays the order of timer operation.

“ ” “ ” display

Displays whether timer is on or off.

button

Sets any desired room temperature.

TIMER CONTROL buttons

AUTO STOP (OFF timer): when this switch
is set, the air conditioner will be

autom ati ca lly 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.

"h" and "min" buttons

Buttons used to set the “hour and minute” of

the current time and timer settings.

CHECK-TEST RUN button

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

VANE CONTROL button

Changes the air flow direction.

LOUVER button

Changes left / right airflow direction.

(Not available for this model.)

CLOCK button

RESET button

SET button

6

4

SPECIFICATIONS

Service Ref.

Power supply(phase, cycle, voltage)

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

INDOOR UNIT

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

Weight

Max. Fuse Size
Min.Circuit Ampacity

Fan motor output
Fan motor

Airflow(Low-Middle-High)

External static pressure

Max. Fuse Size
Min.Circuit Ampacity

Fan motor output
Fan motor

Airflow(Low-Middle-High)

External static pressure

W

D
H

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)

PKA-A12HA4

1 phase, 60Hz, 208/230V

15

1

White Munsell 1.0Y 9.2/0.2

Plate fin coil

Line flow fan (direct) % 1

0.030

0.33
Dry: 9-10.5-12 (320-370-425)
Wet: 8-9.5-11 (290-335-380)

0(direct blow)

Remote controller & built-in

36-40-43

16(5/8)

898 (35-3/8)

249 (9-13/16)

295 (11-5/8)

13 (29)

PKA-A18HA4

1 phase, 60Hz, 208/230V

15

1

White Munsell 1.0Y 9.2/0.2

Plate fin coil

Line flow fan (direct) % 1

0.030

0.33

Dry: 9-10.5-12 (320-370-425)

Wet: 8-9.5-11 (290-335-380)

0(direct blow)

Remote controller & built-in

36-40-43

16(5/8)

898 (35-3/8)

249 (9-13/16)

295 (11-5/8)

13 (29)

7

5

NOISE CRITERION CURVES

PKA-A12HA4
PKA-A18HA4

90

80

70

60

50

40

30

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

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

NOTCH

High

Low

BAND CENTER FREQUENCIES, Hz

SPL(dB)

43
36

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

UNIT

3.3ft

3.3ft

MICROPHONE

WALL

8

6

OUTLINES AND DIMENSIONS

PKA-A12HA4 PKA-A18HA4 Unit: inch (mm)

15-3/16(387)

7-3/4(197)

23-9/16(599)

7-1/2(192)

Top si de

Front side

Mount board

Right side

D

Sleeve
(purchased locally)

:2-1/2~:3-1/8
(:65~:80)

Left side

Knock out hole
for left piping

Through hole

:2-1/2~:3-1/8
(:65~:80)

Knock out hole
for lower piping

77­Tapping
screw hole

5/8(16)

1-1/16(28.5)

1-9/16(41)

3-1/16(78.5)

3-9/16(91)

4-1/16(103.5)

4-9/16(116)

6-1/2(166)

7(178.5)

8(203.5)

9-1/8(232.5)
9-15/16(253.5)

Wall hole for
left rear piping

11-5/8(295)

5/16(8)

4-:5/16(:9)
Bolt hole

:

3/16(:5.1)

0

2-1/8
(55)

C

17-5/8(449)

Vane(auto)

14-5/8(372.3)

14(356.3)

12-7/8(327.5)

11-7/16(291.5)

15-1/2(394)

Louver(manual)

10-3/8(265)

7-13/16(200)

8-13/16(225)

8-3/8(213)

9-5/16(238)

6-13/16(174)

10-15/16(278.3)

27-1/16(688)

35-3/8(898)

Front side(Grille open)

17-15/16(457)Gas pipe

21-3/16(539)Liquid pipe

24(610)Drain hose

Under side

24-1/16(612)

4-7/8(125)

2-3/4(70)

9/16(15)

0

Knock out hole for
left rear piping
2-3/4×12-3/16(70×310)

Knock out hole
for lower piping

2-1/4(58)

0

0

9/16(15)

2-3/4(70)

6-1/16(155)

6-5/8(169)
6-3/16(158)

7-3/16(184)

Operation lamp

Receiver

B

Center measurement hole :3/32(:2.5)

Mount board

5/32(3.8)

14-5/8(372.3)

14(356.3)

12-7/8(237.5)

11-7/16(291.5)

10-3/8(265)

9-5/16(238)

8-13/16(225)

7-13/16(200)

4-7/8(125)

Wall hole for

4-1/2(115)

5-1/2(140)

6-9/16(167)

7-9/16(193.5)

7-1/16(180.3)

11-1/16(281)

right rear piping

Knock out hole
for right piping

Terminal block for indoor/outdoor
connecting line

Terminal block for power supply (option)

Terminal block for
MA-remote controller

Emergency operation switch
(cooling/heating)

DEFROST/STAND BY lamp

Liquid pipe

Refrigerant
Piping

Gas pipe

Drain hose

Indoor unit outline

13/16(21.8)

0
3/4(20)

1-1/4(32.7)
2-1/16(53.5)
2-9/16(66)

5(128.5)
6(153.5)

9-1/16(231.5)

10-3/4(273.2)

17-5/8(449)

:

6.35)

1/4F (

1/2F (:12.7)

:

5/8 (:16) O.D

A

3/16(5)9-13/16(249)

Knock out hole for piping

2-3/16(56)7/16(12.5)

A

1-11/16(43)

C

2-3/16(56)

1-3/4(46)

3/16(6)

1-11/16(43)

2-11/16(69)

2-3/16(56)

3/16(6)

1-3/4(46)

2-5/16(60)

1-11/16(43)

1-11/16(43)

D

2-5/16(59)

B

Required space(Indoor unit)

Min.1-31/32(50)

Min.1/4(7)

250mm,9-13/16inch or greater with

optional drain pump installation.

Min.8-5/8

(220)

(mm)

Air inlet

Air inlet

Air outlet

Min.5-7/8(150)

Min.1-31/32(50)

Min.9-13/16(250)

9

7

WIRING DIAGRAM

PKA-A12HA4 PKA-A18HA4

[LEGEND]

Symbol

I.B Indoor controller board

CN2L Connector (LOSSNAY)
CN30 Connector (LLC)
CN32 Connector ( Remote switch)
CN41 Connector (HA terminal-A)
CN51 Connector (Centrally control)
CN90 Connector (Remote operation adapter)
CN105 Connector (Radio frequency interface)
CN152 Connector (Back-up heating)
FUSE FUSE(T3.15AL250V)
LED1 Power supply (I.B)
LED2 Power supply (R.B)
LED3 Transmission (Indoor-outdoor)
SW1 Switch (Model selection) +See Table 1
SW2
SWE

RFI

Switch (Capacity code) +See Table 2
Connector (Emergency operation)
Radio frequency interface for RF thermostat

Name

Symbol

Name
M Vane motor
MS Fan motor
S.W

Switch board

SWE2 Emergency operation
TB2 Terminal block (Indoor unit Power (option))
TB4 Terminal block (Indoor/outdoor connecting line)
TB5 Terminal block (Remote controller transmission line)
TH1 Room temp. Thermistor

(32°F/15ΚΩ, 77°F/5.4ΚΩ Detect)

TH2

Pipe temp. Thermistor/liquid

(32°F/15ΚΩ, 77°F/5.4ΚΩ Detect)

TH5

Cond./eva. temp. Thermistor

(32°F/15ΚΩ, 77°F/5.4ΚΩ Detect)

W.B Pcb for IR wireless remote controller

LED1 LED (Operation indication : Green)
LED2 LED (Preparation for heating : Orange)
REC1 Receiving unit

OPTION PART

R.B

Wired remote controller board
Terminal block (Remote controller transmission line)

TB6

Refer to
tables
1and 2

I.B

SWE

ON
OFF

CN90
(WHT)

2

11 1 54

CN2L
(RED)

CN152

CN151

(WHT)

11

M

CN20
(RED)

t° t° t°

CN41

(WHT)

(WHT)

CN44

(WHT)

1414

TH1 TH2 TH5

LED1

LED3

LED2

11310

CN30
(BLK)

DB1

1139

CN32
(WHT)

CN51

(WHT)

CN4F

(WHT)

MS

3~

1

CNMF
(WHT)

X1

CN105

(RED)

1525

5

RFI

6

FUSE

CNP(BLU)

CN3C
(BLU)

LDSWE (A)

(BLU)

CNRU
(WHT)

CN01
(BLK)

3
1

3

1

CN22
(BLU)

1
2

1
3

ORN

5

BLK

ORN
BRN

S.W

2

LDSWE (B) SWE2

W.B

6

LD101 (B)

LED1

2

YLWYLW
ORN

RU

REC1

LED2

TB4

S1
S2
S3

TB5

1
2

<+1>

<Table 1>
SW1
(MODEL SELECTION)

SETTING

TO
OUTDOOR
UNIT

12345

<Table 2>
SW2(CAPACITY CODE)

MODELS

PKA­A12HA4

PKA­A18HA4

The black square (
a switch position.

R.B

1

2

TB6

ON
OFF

SETTING

12345

12345

■

)

indicates

ON
OFF

ON
OFF

Notes:

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

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 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.

+

1 : Use copper supply wires.

10

8

REFRIGERANT SYSTEM DIAGRAM

PKA-A12HA4 PKA-A18HA4

Heat exchanger

Strainer (#50)

Refrigerant GAS pipe connection
(Flare)

Thermistor TH5
(Cond./ Eva.temperature)

Thermistor TH1
(Room temperature)

Thermistor TH2
Pipe temperature(Liquid)

Distributor
with strainer (#50/#50)

Refrigerant flow in cooling
Refrigerant flow in heating

Refrigerant LIQUID pipe connection
(Flare)

Strainer (#50)

11

9

TROUBLESHOOTING

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.

12

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>

■IR wireless remote controller

ON/OFF

MODE

CHECK

TEST RUN

SET

CHECK

FAN

VAN E

LOUVER

RESET

TEMP

AUTO STOP

AUTO S TART

h

min

CLOCK

CHECK
display

ON/OFF
button

CHECK
button

Refrigerant
address
display

Temperature
button

HOUR
button

[Procedure]

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.)

■Wired remote controller



ERROR CODE



TEMP.

MENU

MONITOR/SET

BACK DAY

PAR-21MAA

ON/OFF

CLOCK



OPERATION

ON/OFF

CHECK

CLEAR



4. Point the remote controller at the

• The check mode is cancelled.

sensor on the indoor unit and
press the ON/OFF button.

 Turn on the power.
 Press the [CHECK] button twice.
 Set address with [TEMP] button if system control is used.
 Press the [ON/OFF] button to stop the self-check.

 CHECK button
 Address

ERROR CODE

 TEMP. button
 IC : Indoor unit

OC: Outdoor unit
 Check code

FILTER

TEST

ERROR CODE

 Unit No.
 Timer ON/OFF button

– – – – : No trouble generated in the past.

F F F F : No corresponding unit.

<To delete check code>



Display the error code on the self-check result display screen.
 The address for self-check will blink when the

 ON/OFF

button is pressed twice within 3 seconds.

1313

• 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

0.5 sec.

th

n

On

[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

IR 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]

IR 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 operated/

insufficient refrigerant
Abnormal high pressure (63H operated)/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

14

• On IR 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 IR 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 microprocessor) Indicates whether control power is supplied. Make sure that this LED is

LED2 (power for wired 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 wired 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

15

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.

P4

(5701)

P5

Contact failure of drain float switch (CN4F)

Extract when the connector of drain float
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.

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

16

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 pump 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
operating

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 blockage.

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 blockage.

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.

)

17

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.

-

~

18

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
Noise has entered into power
supply.
Noise has entered into outdoor
control wire.

Defective indoor controller
board

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.

E1

or

E2

Remote controller control board

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

(Error code: E1)

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

(Error code: E2)

Defective remote controller Replace remote controller.

19

9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA

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

controller.

Phenomena

(1)Upward/downward vane
performance failure

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.

Cause

Countermeasure

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

Check (left).

• Check the vane motor. (Refer to “How
to check the parts”.)

• Check for breaking of wire or connec­tion failure of connector.

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

(2)Receiver for IR wireless remote
controller

Weak batteries of IR wireless remote controller

Contact failure of connector (CNB) on IR wireless

remote controller board

(Insert failure)
Contact failure of connector (CN90) on indoor con­troller board (Insert failure)
Contact failure of connector between IR wireless
remote controller board and indoor controller board

Replace batteries of IR wireless remote
controller.

~

Check contact failure of each connector.

If no problems are found of connector,

replace indoor controller board.

When the same trouble occurs even if

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

20

9-5. EMERGENCY OPERATION

9-5-1. When IR 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.

DEFROST/STAND BY lamp (ORANGE)



E.O.

SW








Operation lamp (GREEN)



Emergency operation switch (cooling/heating)



Receiver



• Each press of the emergency operation switch will toggle the
operation mode.

• Check “COOL/HEAT” with the operation monitor display. (The display will
appear orange for 5 seconds after pressing the emergency operation switch.)

[Heat pump type]

Cooling

[Cooling Only type]

Cooling Stop

Operation Monitor Display

GREEN ORANGE

STOP

COOL

HEAT

OFF ON

Heating Stop

The orange lamp follows the switch operation
as indicated at the left for 5 sedonds, and
then it will return to the normal display.

* Details of emergency mode are as shown below.

Operation Mod
Set Temperature

Fan Speed

Airflow Direction Up and Down Horizontal

COOL HEAT

24°C, 75°F 24°C, 75°F

High High

Downward

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

1. When the wired remote control or the indoor unit microprocessor 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.
+ Note on the IR 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.
However, if the indoor unit microprocessor has failed, it is nesessary to proceed with points 2 and 3 below as in the
case of the wired remote control.

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 pump 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, thereforeyou have to slowly set them manually to
the appropriate position.

21

9-6. HOW TO CHECK THE PARTS

PKA-A12HA4 PKA-A18HA4

Parts name Check points

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

Vane motor (MV)

Red



Yellow



Brown



Connect pin No.

Orange



M

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

Normal

4.3k~9.6k

Measure the resistance between the terminals with a tester. (Coil temperature 77"F)

Green



-

Brown-Red

-

Brown-Orange

Abnormal

Open or short

Normal

-

Brown-Yellow

350 ± 7%

(Refer to the next page for a detail.)

Abnormal

-

Brown-Green

Open or short

Fan motor (MF)

Refer to 9-6-2.

9-6-1. Thermistor

<Thermistor Characteristic graph>

Thermistor for
lower temperature

Thermistor R
Fixed number of B=3480 ± 2%

t(

)Rt=15exp { 3480( ) }

0
10
20
25
30
40

0=15k ±3%

Room temperature thermistor (TH1)
Pipe temperature thermistor/liquid (TH2)
Condenser/evaporator temperature
thermistor (TH5)

1

273+t

273+

1

273

1

T-32

1.8

1

273

<Thermistor for lower temperature>

50

40

30

20

Resistance (k )

10

0

-20 -10 0 10 20 30 40 50

-4 -14 32 50 68 86 104122 °F
Temperature

°C

22

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 rotate.

Wiring contact check

Contact of fan motor connector (CNMF)

board and fan motor.)

Is there contact failure?

No

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit

TEST POINT

 : VDC (between 1 (+) and 3 (-) of the fan connector): VDC DC294~325V

Yes

Wiring recovery

board.

TEST POINT  : VCC (between 4 (+) and 3 (-) of the fan connector): VCC DC15V

Is the voltage normal?

Yes

No

Indoor controller board fuse check

Is the fuse normal?

Replace the indoor

controller board.

Check the operation

Replace the fan motor.

Sensor signal check

Measure the voltage between CNMF

 and  DC 0V

and DC 15V in the indoor controller circuit board.

Yes

NG

NG

No

Replace

the fuse.

Check the operation END

OK

END

OK

Does the voltage repeat
DC 0V and DC 15V?

Yes

Replace the indoor

controller board.

OK

Check the operation END

NG

Replace the fan motor.

No

Replace the fan motor.

Yes

Check the operation of fan. END

NG

Replace the indoor controller board.

23

OK

9-7. TEST POINT DIAGRAM

Indoor controller board

PKA-A12HA4 PKA-A18HA4

CN105
RFI
(Radio frequency interface)

SWE

Emergency
operation connector

SW1

Model selection

SW2

Capacity setting

CNMF

Connect to the
fan motor (MF)

1-3 : DC294~325V
4-3 : DC15V
5-3 : DC0~6.5V
6-3 : DC0

or DC15V

CN01

Connect to the
Terminal block (TB4)
1-3 : 208/230VAC

{

FUSE

(3.15A 250V)

LED1:Power supply (I.B)
LED2:Power supply (R.B)
LED3:Transmission

(Indoor/outdodr)

CN3C

Transmission
(Indoor/outdodr)
(DC 0~24V)

CN151

Connect to the
vane motor (MV)

Jumper wire J41,J42

Pair No. setting for
IR wireless remote

controller

CN152
Connector
(Back-up heating)

CN44

Pipe temperature thermistor
1-2 : Liquid (TH2)

Condenser/Evaporator

3-4 :
(TH5)

CN20

Room temp.
thermistor (TH1)

SWE2

Emergency
operation switch

CN2L

Connector
(LOSSNAY)

CN41

Connector
(HA terminal-A)

IR wireless remote controller board

CN22

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

CN30

Connector (LLC)

CN32

Remote switch

CN90

Connect to the remote
operation adapter

CN51

Centrally control

1-2 : Control signal

13VDC pulse input (1: +)

3-4 : Operation indicator

13VDC (3: +)

3-5 : Malfunction indicator

13VDC (3: +)

24

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.

The black square (■) indicates a switch position.

Jumper wire

SW1

SW2

J41
J42

Functions

Model
settings

Capacity
settings

Pair number
setting with
IR wireless
remote
controller

Setting by the dip switch and jumper wire

MODELS

PKA-A·HA4

MODELS

A12

A18

Wireless remote

controller setting

0
1
2

3 ~ 9

SETTING

12345

SETTING

12345

12345

Control PCB setting

ON
OFF

ON
OFF

ON
OFF

J41 J42

Jumper wire ( : Short : Open)

Remarks

<Initial setting>
IR wireless remote controller: 0
Control PCB: (for both J41 and J42)
4 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 wire is dis­connected.)

JP3

Indoor
controller
board type
setting

Indoor controller board type

For product
Spare parts

JP3

: With JP3
: Without JP3

25

10

SPECIAL FUNCTION

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

This function is only available when using wired remote controller.

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"

· 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 IR wireless remote controller.)

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

Sub unit

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

Fig. 1

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

Refrigerant address
"00"

Main
unit

2

OC-1

3(2)

IC-1

2

RC

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 4 degrees 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)

26

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)

Setting contents

Monitoring the request code of current setting.

Cut-in function OFF

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))

2727

Initial
setting

(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 (CN152)

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

10-2-2. How to connect

When connecting to the connector CN152 of the indoor unit, use
PAC-SE59RA-E(optional parts).

Z0 2.5˚C(4.5˚F)

ON

ON

OFF

28

11

DISASSEMBLY PROCEDURE

PKA-A12HA4 PKA-A18HA4

1. REMOVING THE LOWER SIDE OF THE INDOOR
UNIT FROM THE INSTALLATION PLATE

(1) Remove the front panel.
(2) Insert the screw driver to the corner hole at both left and

right side as shown in the figure 1.
(3) Push it up, then pull down the lower side of indoor unit and
remove the hook.

PHOTOS & ILLUSTRATIONSOPERATION PROCEDURE

Figure 1

Be careful
not to damage
the airflow
adjustment
plate with the
screw driver.

Be careful when removing heavy parts.

Push

Corner hole

Push

Down

2. REMOVING THE FRONT PANEL

(1) Press and unlock the knobs on both sides of the front

panel and lift the front panel until it is level. Pull the hinges
forward to remove the front panel. (See Photo 2)

(2) Move the horizontal vanes in a downward direction.
(3) Remove the screw caps of the panel. Remove the screws.
(See Photo 1)
(4) Hold the lower part of both ends of the panel and pull it

slightly toward you, and then remove the panel by pushing
it upward.

Photo 1

Photo 2

Van es

Front panel

Screw caps

29

PHOTOSOPERATION PROCEDURE

3. REMOVING THE INDOOR CONTROLLER BOARD
AND IR WIRELESS CONTROLLER BOARD

(1) Remove the front panel. (Refer to step 2)
(2) Remove the room temp. thermistor TH1. (see Photo 3)
(3) Remove the electrical box covers (screw 4 × 12).
(See Photo 3)
(4) Disconnect the connectors on the indoor controller board.
(5) Remove the switch board cover.
(6) Pull out the indoor controller board toward you, then
disconnect the rest of connectors.
Remove the indoor controller board and switch board.
(7) Remove the holder of IR wireless controller board.
(8) Disconnect the connector of IR wireless controller board

and remove the IR wireless controller board from the
holder.

Photo 3

Screw (top cover)

Nozzle assembly

Photo 4

Terminal
block (TB4)

Screw (side cover)

Switch holder

Indoor controller board (I.B)

Electrical box
cover (top)

Electrical box
cover (side)

Room temp.
thermistor
(TH1)

Thermistor
holder

Screw
(side cover)

Holder of IR wireless
controller board

Fixture
(right)

4. REMOVING THE ELECTRICAL BOX

(1) Remove the front panel. (Refer to step 2)
(2) Remove the electrical box covers. (See Photo 3)
(3) Remove the nozzle assembly. (Refer to step 5)
(4) Disconnect the connecting wire from terminal block (TB4)

and terminal block for MA-remote controller (TB5).
(5) Disconnect the connectors on the indoor controller board.
(6) Disconnect the connector for the ground wire. (See Photo 5)
(7) Pull the disconnected lead wire out from the electrical box.
(8) Remove the screw of electrical box. (See Photo 6)
(9) Push up the upper fixture (See Photo 5) catch to remove

the box, then pull the right fixture (See Photo 4) and
remove it from the box fixture.

Photo 5

Connector for
ground wire

Photo 6

Fixture
(upper)

Terminal
block (TB4)

Terminal
block (TB5)

Screw
(Electrical box)

30

PHOTOSOPERATION PROCEDURE

5. REMOVING THE NOZZLE ASSEMBLY (with VANE

and VANE MOTOR) AND DRAIN HOSE

(1) Remove the front panel (Refer to step 2).
(2) Remove the electrical box cover.
(3) Disconnect the vane motor connector (CN151) on the
indoor controller board.
(4) Remove the corner box.
(5) Pull the nozzle assembly and detach.
(6) Push the fixture and remove the drain hose.

6. REMOVING THE INDOOR FAN MOTOR AND THE

LINE FLOW FAN

(1) Remove the front panel (Refer to step 2) and the corner

box at right lower side.

(2) Remove the electrical box (Refer to step 4) and the nozzle

assembly (Refer to step 5).
(3) Remove the screws fixing the motor bed. (See Photo 8)
(4) Loosen the screw fixing the line flow fan. (See Photo 9)
(5) Remove the motor bed together with fan motor and motor

band.
(6) Release the hooks of the motor band. Remove the motor

band. Pull out the indoor fan motor.
(7)

Remove the screws fixing the left side of the heat exchanger.
(See Photo 10)
(8) Lift the heat exchanger, and pull out the line flow fan to the

lower-left.

Photo 7

Photo 8

Heat
exchanger

Photo 9

Screw (top cover)

Nozzle assembly

Screws of the motor bed

Electrical box cover (side)

Electrical box cover (top)

Screw (side cover)

Switch board cover

Holder of
IR wireless
controller board

Motor band

Water cover

Screw
(side
cover)

Photo 10

Screws of the
left side of the
heat exchanger

7. REMOVING THE VANE MOTOR

(1) Remove the nozzle assembly. (Refer to step 5)
(2) Remove the screws of the vane motor unit, and pull out

the vane motor unit.
(3) Remove the screws of the vane motor unit cover.
(4) Remove the vane motor from the vane motor unit.
(5) Disconnect the connector from the vane motor.

Screw of the
line flow fan

Photo 11

Screws of the vane
motor unit

Screws of the vane motor unit cover

31

PHOTOSOPERATION PROCEDURE

8. REMOVING THE LIQUID PIPE THERMISTOR AND
COND/EVA TEMP. THERMISTOR

(1) Remove the front panel. (Refer to step 2)
(2) Remove the electrical box cover.
(3) Remove the motor band.
(4) Cut the wiring fixed band.
(5)

Remove the liquid pipe thermistor and cond/eva temp. ther-

mistor.
(6) Disconnect the connector (CN44) on the indoor
controller board.

9. REMOVING THE HEAT EXCHANGER

(1) Remove the front panel (Refer to step 2) and the corner

panel at right lower side.
(2) Remove the electrical box (Refer to step 4) and the nozzle
assembly (Refer to step 5).
(3) Remove the motor band.
(4) Remove the pipe thermistors (Refer to step 8).
(5) Disconnect the connector (CN60) on the indoor controller
board and the connector for ground wire. (See Photo 5)
(6) Remove the screws fixing the left side of the heat
exchanger. (See Photo 9)
(7) Remove the heat exchanger.

Photo 12

Heat exchanger

Photo 13

Heat exchanger

Water cover

Nozzle assembly

Condenser/evaporator temp.
thermistor (TH5)

Liquid pipe thermistor (TH2)

Electrical box cover (side)

Electrical box cover (top)

Screw (side cover)

Screw (top cover)

Switch board cover

Holder of

IR wireless
controller board

Screw
(side
cover)

10. REMOVING THE ROOM TEMPERATURE THERMISTOR

(1) Remove the front panel (Refer to step 2).
(2) Remove the electrical box cover.
(3) Remove the room temperature thermistor.
(4) Disconnect the connector (CN20) on the indoor controller
board.

32

Photo 14

Screw (top cover)

Nozzle assembly

Screw (side cover)

Switch holder

Electrical box

cover (top)

Electrical box
cover (side)

Room temp.
thermistor
(TH1)

Thermistor
holder

Screw
(side cover)

Holder of
IR wireless
controller board

333435

TM

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

CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Distributed in Nov. 2010 No.OCH483
Made in Japan

New publication, effective Nov. 2010
Specifications subject to change without notice