Mitsubishi Electric PKA-A12HA, PKA-A18HA, PKA-A12HAL, PKA-A18HAL Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

3 3 2 2 3

SPLIT-TYPE, AIR CONDITIONERS

SERVICE MANUAL

Indoor unit
[Model names] [Service Ref.]

PKA-A12HA

PKA-A18HA

PKA-A12HAL

PKA-A12HA
PKA-A18HA
PKA-A12HAL

March 2009

No. OCH456

NOTE:

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

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

PKA-A18HAL

INDOOR UNIT

PKA-A18HAL

COOL

DRY

AUTO

FAN

HEAT

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

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

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

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

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

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

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

.........................................10

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

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

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

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

2

3
4

7

8
9

11
12
27
30

TEMP.

WIRED REMOTE

CONTROLLER

ON/OFF

WIRELESS REMOTE

CONTROLLER

PARTS CATALOG (OCB456)

1

REFERENCE MANUAL

1-1. OUTDOOR UNIT SERVICE MANUAL

Service Ref. Service Manual No.
PUZ-A18/24/36NHA3

PUZ-A18/24/36NHA3-BS
PUY-A12/18/24/36NHA3
PUY-A12/18/24/36NHA3-BS

PUZ-HA36NHA2

OCH458
OCB458

OCH426
OCB426

1-2. TECHNICAL DATA BOOK

Series (Outdoor unit) Data Book No.
PUZ-A·NHA3(-BS)

PUY-A·NHA3(-BS)
PUZ-HA·NHA2 OCS15

OCS14

2

2

SAFETY PRECAUTION

2-1. ALWAYS OBSERVE FOR SAFETY

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

2-2. CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilising refrigerant R410A

Use new refrigerant pipes.

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

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

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

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

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

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

Do not use refrigerant other than R410A.

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

Use a vacuum pump with a reverse flow check
valve.

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

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

The following tools are necessary to use R410A refrigerant.

Tools for R410A
Gauge manifold
Charge hose

Gas leak detector

Torque wrench

Flare tool
Size adjustment gauge
Vacuum pump adaptor

Electronic refrigerant
charging scale

Handle tools with care.

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

Charge refrigerant from liquid phase of gas
cylinder.

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

[1] Cautions for service

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

[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.)

Do not use a charging cylinder.

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

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

3

Unit

Gravimeter

[3] Service tools

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

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

· Use the existing fitting

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

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

· Cylinder with syphon
8 Refrigerant recovery equipment

specifications

. (UNF1/2)

3

PART NAMES AND FUNCTIONS

Indoor unit

Filter

Louver

Air outlet

Air intake

Vane

4

 Wired remote controller

Display Section

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

Identifies the current operation

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

“Centrally Controlled” indicator

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

“Timer is Off” indicator

Indicates that the timer is off.

Temperature Setting

Shows the target temperature.

Day-of-Week

Shows the current day of the week.

Time/Timer Display

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

TIME SUN MON TUE WED THU FRI SAT
TIMER

AFTER

ERROR CODE

°F°C

Hr

AFTER

°F°C

ONLY1Hr.

Up/Down Air Direction indica­tor

The indicator shows the direc­tion of the outcoming airflow.

“One Hour Only” indicator

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

Displayed when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons have been locked.

“Clean The Filter” indicator

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

Timer indicators

The indicator comes on if the corre­sponding timer is set.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in
Ventilation mode.

Operation Section

Temperature setting buttons

Down

Up

Timer Menu button
(Monitor/Set button)

Mode button (Return button)

TEMP.

Set Time buttons

Back

Ahead

Timer On/Off button
(Set Day button)

Opening the
lid

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

 Wireless remote controller

CHECK

TEST RUN

display

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

MODEL SELECT

Blinks when model is selected.

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

m3/min(CFM)

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-A12HA, PKA-A12HAL

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-A18HA, PKA-A18HAL

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-A12HA
PKA-A18HA
PKA-A12HAL
PKA-A18HAL

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-A12HA PKA-A12HAL PKA-A18HA PKA-A18HAL Unit: inch (mm)

15-3/16(387)

7-3/4(197)

23-9/16(599)

7-1/2(192)

Top side

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

77­Tap p in g
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)

11-5/8(295)

5/16(8)

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

:

3/16(:5.1)

0

Wall hole
for
left rear
piping

2-1/8
(55)

Vane(auto)

C

14-5/8(372.3)

14(356.3)

15-1/2(394)

17-5/8(449)

Louver(manual)

12-7/8(327.5)

10-3/8(265)

11-7/16(291.5)

10-15/16(278.3)

24-1/16(612)

7-13/16(200)

8-13/16(225)

8-3/8(213)

9-5/16(238)

6-13/16(174)

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

Knock out hole
for lower piping

0

4-7/8(125)

2-3/4(70)

0

9/16(15)

0

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

Operation lamp

Center measurement hole :3/32(:2.5)

Mount board

2-1/4(58)

5/32(3.8)

8-13/16(225)

2-3/4(70)

4-1/2(115)

7-13/16(200)

4-7/8(125)

5-1/2(140)

6-9/16(167)

7-1/16(180.3)

7-9/16(193.5)

9/16(15)

6-1/16(155)

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

7-3/16(184)

B

11-7/16(291.5)

10-3/8(265)

9-5/16(238)

11-1/16(281)

DEFROST/STAND BY lamp

Receiver

Indoor unit outline

14-5/8(372.3)

14(356.3)

12-7/8(237.5)

Wall hole for
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
(only PKA-A·HA models)

Emergency operation switch
(cooling/heating)

Liquid pipe

Refrigerant
Piping

Gas pipe

Drain hose

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

C

2-3/16(56)

1-3/4(46)

3/16(6)

1-11/16(43)

1-11/16(43)

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

A

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-A12HA PKA-A18HA PKA-A12HAL PKA-A18HAL

[Explanation of symbols]

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)
CN152 Connector (Back-up heating)
DSA Surge absorber
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

Switch (Capacity code) +See table 2
Connector (Emergency operation)

SWE
ZNR01,02

Varistor

R.B

Wired remote controller

TB6

Terminal block (Remote controller transmission line)

Name

I.B

T11 DB1

SWE

ON
OFF

Refer to
tables
1and 2

CN151
(WHT)

11

M

2

11 1 54
CN2L
(RED)

CN152
(WHT)

CN20

(RED)

○t○t○

t

TH1 TH2 TH5

CN90
(WHT)

141425

CN41

(WHT)

CN44

(WHT)

LED1

LED3

LED2

11310

CN30
(BLK)

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 for power and signal.

+

1: If indoor and outdoor units have separate power supplies, refer to Fig 1.

+

2: For power supply system of this unit, refer to the caution label located near this diagram.

+

3: Use copper supply wires.

Symbol
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 wireless remote controller

LED1 LED (Operation indication: Green)

LED2 LED (Preparation for heating: Orange)

REC1 Receiving unit

MS

3~

CNMF

1139

CN32

(WHT)

CN51

(WHT)

CN4F
(WHT)

1

ZNR01

ZNR02

(WHT)

U

U

X1

CNP(BLU)

6

FUSE

DSA

CN3C
(BLU)

LDSWE(A

(BLU)

CNRU
(WHT)

CN22

(BLU)

CN01
(BLK)

3
1

3

1

)

1
2

Name

1
3

ORN

5

BLK

ORN

BRN

W.B

6

LD101(B)

LED1

YLWYLW

ORN

RU

REC1

LED2

2

<+3>

TB4

TO

S1

OUTDOOR

S2

UNIT

S3

S.W

LDSWE(B) SWE2

+1(Fig. 1)
CN01

(BLK)

1
3
5

BLU

BLU

I.B

YLW
ORN

I.B

1

CN3C(BLU)

<Table 1>
SW1
(MODEL SELECTION)

SETTING

12345

<Table 2>
SW2(CAPACITY CODE)

MODELS

A12

A18

1
2

TB5

For PKA-A.HA

GRN

INDOOR/OUTDOOR

3

COMMUNICATION

RED
BLU

/

YLW

YLW
ORN
ORN
BRN

R.B

TB6

TB2

L1

L2

GR

TB4

S1

S2

S3

1
2

ON
OFF

SETTING

12345

12345

POWER SUPPLY
208/230V 60Hz

TO OUTDOOR
UNIT

ON
OFF

ON
OFF

10

8

REFRIGERANT SYSTEM DIAGRAM

PKA-A12HA PKA-A18HA PKA-A12HAL PKA-A18HAL

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