Mitsubishi Electronics PEAD-A24AA, PEAD-A42AA, PEAD-A36AA, PEAD-A30AA User Manual

SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP
AIR CONDITIONERS

2009

Series PEAD

<indoor unit> Service ref.

Models

PEAD-A24AA
PEAD-A30AA
PEAD-A36AA
PEAD-A42AA

INDOOR UNIT

R410A

NOTE:

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

CONTENTS

1. SAFETY PRECAUTION ····························· 2

2. PART NAMES AND FUNCTIONS ·············· 3

3. SPECIFICATION ········································ 5

4. FAN PERFORMANCE AND
CORRECTED AIR FLOW ·························· 7

5. SOUND PRESSURE LEVELS ···················12

6. OUTLINES & DIMENSIONS ······················16

7. WIRING DIAGRAM ····································17

8. REFRIGERANT SYSTEM DIAGRAM ········18

9. HEATER CONTROL ··································18

10

. TROUBLESHOOTING ·······························21

11

. DISASSEMBLY PROCEDURE ··················35

TEMP.

REMOTE CONTROLLER

ON/OFF

TM

1

SAFETY PRECAUTION

1-1. ALWAYS OBSERVE FOR SAFETY

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

1-2. CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilising refrigerant R410A

Use new refrigerant pipes.

In case of using the existing pipes for R22, be careful with
the followings.

· For A36 and A42, be sure to perform replacement oper-

ation before test run.

· Change flare nut to the one provided with this product.

Use a newly flared pipe.

· Avoid using thin 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 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.

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.

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 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

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.

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.)

2

Gravimeter

[3] Service tools

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

No. Tool name Specifications

1 Gauge manifold

2 Charge hose

3 Electronic scale

4 Gas leak detector

5 Adaptor for reverse flow check

6 Refrigerant charge base

7 Refrigerant cylinder

8 Refrigerant recovery equipment

· Only for R410A

· Use the existing fitting specifications. (UNF1/2)

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

· Only for R410A

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

· Use the detector for R134a, R407C or R410A.

· Attach on vacuum pump.

· Only for R410A · Top of cylinder (Pink)

· Cylinder with syphon

Unit

2

Indoor Unit

•

Air intake (sucks the
air inside the room
into the unit)

PART NAMES AND FUNCTIONS

In case of rear inlet

Air outlet

In case of bottom inlet

3

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 8–39
The display blinks if the temperature
is less than 8

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

˚C or 39˚C or more.

“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

˚C.

Ventilation mode.

Operation Section

Temperature setting buttons

Down

Up

Timer Menu button
(Monitor/Set button)

Mode button (Return button)

TEMP.

ON/OFF

Set Time buttons

Back

Ahead

Timer On/Off button
(Set Day button)

Opening the
lid

BACK DAY

PAR-21MAA

MENU

MONITOR/SET

CLOCK

ON/OFF

OPERATION

FILTER

CHECK

CLEAR

TEST

Built-in temperature sensor

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

ON/OFF button

Fan Speed button

Filter button
(<Enter> button)

Test Run button

Check button (Clear button)

Airflow Up/Down button

Louver button
( Operation button)

To return operation
number

Ventilation button
( Operation button)

To go to next operation
number

4

Service Ref.
Power supply (phase, cycle, voltage)

Max. Fuse Size
Min. Circuit Ampacity A

A

External finish
Heat exchanger

Fan

Fan (drive) × No.
F

Fan motor

an motor output kW

F.L.A

Airflow (Low-Mid-High)

m

3

/min (CFM)

External static pressure Pa (in.WG)
Operation control & Thermostat
Sound pressure level
(Low-Mid-High)

dB (A)

Field drain pipe O.D mm (in.)
Dimensions W mm (in.)

D mm (in.)
H mm (in.)

kg (lbs)

INDOOR UNIT

Weight

35Pa (0.14 in.WG)
50Pa (0.20 in.WG)
70Pa (0.28 in.WG)

100Pa (0.40 in.WG)

150Pa (0.60in.WG)

Service Ref.
Power supply (phase, cycle, voltage)

Max. Fuse Size

Min. Circuit Ampacity A

A

External finish
Heat exchanger

Fan

Fan (drive) × No.

F

Fan motor

an motor output kW

F.L.A

Airflow (Low-Mid-High)

m

3

/min (CFM)

External static pressure Pa (in.WG)
Operation control & Thermostat
Sound pressure level
(Low-Mid-High)

dB (A)

Field drain pipe O.D mm (in.)
Dimensions W mm (in.)

D mm (in.)
H mm (in.)

kg (lbs)

INDOOR UNIT

Weight

35Pa (0.14 in.WG)
50Pa (0.20 in.WG)
70Pa (0.28 in.WG)

100Pa (0.40 in.WG)

150Pa (0.60in.WG)

Service Ref.
Power supply (phase, cycle, voltage)

Max. Fuse Size

Min. Circuit Ampacity A

A

External finish
Heat exchanger

Fan

Fan (drive) × No.

F

Fan motor

an motor output kW

F.L.A

Airflow (Low-Mid-High)

m

3

/min (CFM)

External static pressure Pa (in.WG)
Operation control & Thermostat
Sound pressure level
(Low-Mid-High)

dB (A)

Field drain pipe O.D mm (in.)
Dimensions W mm (in.)

D mm (in.)
H mm (in.)

kg (lbs)

INDOOR UNIT

Weight

35Pa (0.14 in.WG)
50Pa (0.20 in.WG)
70Pa (0.28 in.WG)

100Pa (0.40 in.WG)

150Pa (0.60in.WG)

PEAD-A24AA

1 phase, 60Hz, 208/230V

15

2.63

1 phase, 60Hz, 208/230V

15

2.73

1 phase, 60Hz, 208/230V

15

3.30

Galvanized sheets

Plate fin coil

Sirocco fan

× 2

0.121

2.10

14.5-18.0-21.0 (512-636-742)

35-50-70-100-150 (0.14-0.20-0.28-0.40-0.60)

Remote controller & built-in

25-28-32
25-29-33
26-30-34
27-31-35
29-34-38

32 (1-1/4)

1100 (43-5/16)

732 (28-7/8)

250 (9-7/8)

33 (73)

PEAD-A30AA

PEAD-A36AA

Galvanized sheets

Plate fin coil

Sirocco fan × 2

0.121

2.18

17.5-21.0-25.0 (618-742-883)

35-50-70-100-150 (0.14-0.20-0.28-0.40-0.60)

Remote controller & built-in

25-29-34
26-30-34
27-31-35
28-32-36
30-35-39

32 (1-1/4)

1100 (43-5/16)

732 (28-7/8)

250 (9-7/8)

33 (73)

Galvanized sheets

Plate fin coil

Sirocco fan

× 2

0.244

2.64

24.0-29.0-34.0 (847-1024-1201)

35-50-70-100-150 (0.14-0.20-0.28-0.40-0.60)

Remote controller & built-in

28-33-38
29-34-38
30-35-39
31-36-40
34-40-43

32 (1-1/4)

1400 (55-1/8)

732 (28-7/8)

250 (9-7/8)

41 (91)

3

SPECIFICATION

5

Service Ref.
Power supply (phase, cycle, voltage)

Max. Fuse Size

Min. Circuit Ampacity A

A

External finish
Heat exchanger

Fan

Fan (drive) × No.

F

Fan motor

an motor output kW

F.L.A

Airflow (Low-Mid-High)

m

3

/min (CFM)

External static pressure Pa (in.WG)
Operation control & Thermostat
Sound pressure level
(Low-Mid-High)

dB (A)

Field drain pipe O.D mm (in.)
Dimensions W mm (in.)

D mm (in.)
H mm (in.)

kg (lbs)

INDOOR UNIT

Weight

35Pa (0.14 in.WG)
50Pa (0.20 in.WG)
70Pa (0.28 in.WG)

100Pa (0.40 in.WG)

150Pa (0.60in.WG)

PEAD-A42AA

1 phase, 60Hz, 208/230V

15

3.50

Galvanized sheets

Plate fin coil

Sirocco fan

× 2

0.244

2.80

29.5-35.5-42.0 (1042-4254-1483)

35-50-70-100-150 (0.14-0.20-0.28-0.40-0.60)

Remote controller & built-in

31-36-40
33-36-40
33-37-41
34-39-42
37-41-45

32 (1-1/4)

1400 (55-1/8)

732 (28-7/8)

250 (9-7/8)

43 (95)

6

4

FAN PERFORMANCE AND CORRECTED AIR FLOW

PEAD-A24AA

(External static pressure 35Pa) 208-230V 60Hz

60

[0.241]

50

[0.201]

Limit

40

[0.161]

Rated point

30

[0.120]

20

[0.080]

External static pressure (Pa)[in.WG]

10

[0.040]

0

[0]

10

[353]

PEAD-A24AA

(External static pressure 50Pa) 208-230V 60Hz

70

[0.281]

60

[0.241]

50

[0.201]

Limit

[530]

15

Airflow rate (m

Low

[706]

20

Middle

3

/min)[cfm]

Rated point

High

[883]

PEAD-A24AA

(External static pressure 100Pa) 208-230V 60Hz

150

[0.602]

[0.401]

Limit

100

Rated point

High

Middle

50

[0.201]

External static pressure (Pa)[in.WG]

Low

0

25

30

[1059]

[0]

10

[353]

PEAD-A24AA

(External static pressure 150Pa) 208-230V 60Hz

200

[0.803]

150

[0.602]

15

[530]

Limit

[706]

Airflow rate (m

20

3

/min)[cfm]

Rated point

[883]

25

30

[1059]

High

40

[0.161]

30

[0.120]

External static pressure (Pa)[in.WG]

20

[0.080]

10

[0.040]

0

[0]

10

[353]

PEAD-A24AA

(External static pressure 70Pa) 208-230V 60Hz

90

[0.361]

80

[0.321]

70

[0.281]

[0.241]

[0.201]

[0.161]

[0.120]

External static pressure (Pa)[in.WG]

[0.080]

[0.040]

60

50

40

30

20

10

0

[0]

[353]

Limit

10

[530]

[530]

Low

15

Airflow rate (m

15

Airflow rate (m

[706]

Low

[706]

20

20

3

/min)[cfm]

3

/min)[cfm]

Middle

Rated point

Middle

High

[883]

[883]

25

High

25

30

[1059]

30

[1059]

[0.401]

External static pressure (Pa)[in.WG]

[0.201]

100

Middle

50

Low

0

[0]

[353]

10

15

[530]

[706]

Airflow rate (m

20

3

/min)[cfm]

[883]

25

30

[1059]

7

PEAD-A30AA

(External static pressure 35Pa) 208-230V 60Hz

70

[0.281]

60

[0.241]

[0.201]

[0.161]

[0.120]

External static pressure (Pa)[in.WG]

[0.080]

[0.040]

50

40

30

20

10

0

[0]

10

[353]

Limit

[530]

Middle

Low

15

[706]

Airflow rate (m

20

3

/min)[cfm]

High

[883]

25

Rated point

PEAD-A30AA

(External static pressure 100Pa) 208-230V 60Hz

150

[0.602]

Limit

100

[0.401]

50

[0.201]

External static pressure (Pa)[in.WG]

0

[0]

30

[1059]

[353]

10

15

[530]

Low

[706]

Airflow rate (m

20

Middle

3

/min)[cfm]

High

Rated point

25

[883]

30

[1059]

PEAD-A30AA

(External static pressure 50Pa) 208-230V 60Hz

90

[0.361]

80

[0.321]

70

[0.281]

60

[0.241]

50

[0.201]

40

[0.161]

30

[0.120]

External static pressure (Pa)[in.WG]

20

[0.080]

10

[0.040]

0

[0]

10

[353]

PEAD-A30AA

(External static pressure 70Pa) 208-230V 60Hz

100

[0.401]

90

[0.361]

80

[0.321]

70

[0.281]

60

[0.241]

50

[0.201]

40

[0.161]

30

External static pressure (Pa)[in.WG]

[0.120]

20

[0.080]

10

[0.040]

0

[0]

10

[353]

Limit

Limit

15

[530]

15

[530]

Middle

Low

[706]

Airflow rate (m

Middle

Low

[706]

Airflow rate (m

20

20

3

/min)[cfm]

3

/min)[cfm]

High

High

Rated point

25

[883]

25

[883]

Rated point

PEAD-A30AA

(External static pressure 150Pa) 208-230V 60Hz

200

[0.803]

150

30

[1059]

30

[1059]

[0.602]

[0.401]

External static pressure (Pa)[in.WG]

[0.201]

100

50

0

[0]

10

[353]

Limit

[530]

15

[706]

Airflow rate (m

20

Middle

Low

3

/min)[cfm]

High

Rated point

25

[883]

30

[1059]

8

PEAD-A36AA

(External static pressure 35Pa) 208-230V 60Hz

70

[0.281]

Limit

60

[0.241]

50

[0.201]

40

[0.161]

30

[0.120]

3

/min)[cfm]

Middle

External static pressure (Pa)[in.WG]

20

[0.080]

10

[0.040]

0

[0]

10

[353]15[530]20[706]25[883]30[1059]35[1236]40[1412]45[1589]

Low

Airflow rate (m

Rated point

High

PEAD-A36AA

(External static pressure 100Pa) 208-230V 60Hz

150

[0.602]

Limit

High

100

[0.401]

Middle

50

[0.201]

External static pressure (Pa)[in.WG]

0

[0]

10

[353]15[530]20[706]25[883]30[1059]35[1236]40[1412]45[1589]

Low

Airflow rate (m

3

/min)[cfm]

Rated point

PEAD-A36AA

(External static pressure 50Pa) 208-230V 60Hz

100

[0.401]

90

[0.361]

80

[0.321]

70

[0.281]

60

[0.241]

50

[0.201]

40

[0.161]

30

External static pressure (Pa)[in.WG]

[0.120]

20

[0.080]

10

[0.040]

[0]

PEAD-A36AA

(External static pressure 70Pa) 208-230V 60Hz

150

[0.602]

Limit

High

Middle

Low

0

10

[353]15[530]20[706]25[883]30[1059]35[1236]40[1412]45[1589]

Airflow rate (m

3

/min)[cfm]

Limit

Rated point

PEAD-A36AA

(External static pressure 150Pa) 208-230V 60Hz

200

[0.803]

High

150

[0.602]

Limit

Middle

100

[0.401]

Low

External static pressure (Pa)[in.WG]

50

[0.201]

0

[0]

10

[353]15[530]20[706]25[883]30[1059]35[1236]40[1412]45[1589]

Airflow rate (m

3

/min)[cfm]

Rated point

100

[0.401]

High

Middle

50

[0.201]

External static pressure (Pa)[in.WG]

0

[0]

10

[353]15[530]20[706]25[883]30[1059]35[1236]40[1412]45[1589]

Low

Airflow rate (m

3

/min)[cfm]

Rated point

9

PEAD-A42AA

(External static pressure 35Pa) 208-230V 60Hz

70

[0.281]

Limit

60

[0.241]

Middle

3

/min)[cfm]

[0.201]

[0.161]

[0.120]

External static pressure (Pa)[in.WG]

[0.080]

[0.040]

50

40

30

20

10

0

[0]

15

[530]20[706]

Low

25

[883]30[1059]35[1236]40[1412]45[1589]

Airflow rate (m

High

Rated point

PEAD-A42AA

(External static pressure 100Pa) 208-230V 60Hz

200

[0.803]

Limit

150

[0.602]

[0.401]

External static pressure (Pa)[in.WG]

[0.201]

100

50

0

[0]

15

[530]

20

[706]25[883]30[1059]35[1236]40[1412]45[1589]

Middle

Low

3

Airflow rate (m

Airflow rate (m3/min)[cfm]

/min)[cfm]

High

Rated point

PEAD-A42AA

(External static pressure 50Pa) 208-230V 60Hz

100

[0.401]

90

[0.361]

80

[0.321]

70

[0.281]

60

[0.241]

50

[0.201]

40

[0.161]

30

External static pressure (Pa)[in.WG]

[0.120]

20

[0.080]

10

[0.040]

0

[0]

[530]20[706]

PEAD-A42AA

(External static pressure 70Pa) 208-230V 60Hz

150

[0.602]

Limit

Middle

Low

15

25

[883]30[1059]35[1236]40[1412]45[1589]

3

Airflow rate (m

Airflow rate (m3/min)[cfm]

/min)[cfm]

Limit

100

[0.401]

Middle

High

High

Rated point

Rated point

PEAD-A42AA

(External static pressure 150Pa) 208-230V 60Hz

250

[1.004]

[0.803]

[0.602]

[0.401]

External static pressure (Pa)[in.WG]

[0.201]

200

150

100

Limit

Low

50

0

[0]

15

[530]

20

[706]25[883]30[1059]35[1236]40[1412]45[1589]

Airflow rate (m

Airflow rate (m

Middle

3

3/min)[cfm]

/min)[cfm]

High

Rated point

[0.201]

External static pressure (Pa)[in.WG]

50

0

[0]

15

[530]20[706]

Low

25

[883]30[1059]35[1236]40[1412]45[1589]

Airflow rate (m

3/min)[cfm]

Airflow rate (m3/min)[cfm]

10

PEAD-A24, 30, 36,42AA

Air filter 208-230V 60Hz

15

[0.060]

10

[0.040]

5

[0.020]

External static pressure (Pa)[in.WG]

0

[0]

0

[0]

[353]

10

Airflow rate (m

[706]

A36,42

A24,30

20

3

/min)[cfm]

30

[1059]

40

[1412]

11

5

SOUND PRESSURE LEVELS

5-1. Sound pressure level

Ceiling concealed

5-2. NC curves

PEAD-A24AA

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa)

Octave band center frequencies (Hz)

External static pressure 0.20 [in.WG] (50Pa)

Octave band center frequencies (Hz)

External static pressure 0.28 [in.WG] (70Pa)

Octave band center frequencies (Hz)

2m

Aux. duct

test unit

1.5m

Measurement location

High

Low

Middle

High

Low

Middle

High

Low

Middle

NC-60

NC-50

NC-40

NC-30

NC-20

NC-60

NC-50

NC-40

NC-30

NC-20

NC-60

NC-50

NC-40

NC-30

NC-20

1m

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

Octave band center frequencies (Hz)

External static pressure 0.60 [in.WG] (150Pa)

Octave band center frequencies (Hz)

High
Middle

High
Middle

Low

NC-60

NC-50

NC-40

NC-30

NC-20

Low

NC-60

NC-50

NC-40

NC-30

NC-20

12

PEAD-A30AA

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa)

High
Middle

Octave band center frequencies (Hz)

Low

NC-60

NC-50

NC-40

NC-30

NC-20

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

Octave band center frequencies (Hz)

High
Middle

Low

NC-60

NC-50

NC-40

NC-30

NC-20

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.20 [in.WG] (50Pa)

High
Middle

Octave band center frequencies (Hz)

Low

External static pressure 0.28 [in.WG] (70Pa)

High
Middle

Octave band center frequencies (Hz)

Low

NC-60

NC-50

NC-40

NC-30

NC-20

NC-60

NC-50

NC-40

NC-30

NC-20

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.60 [in.WG] (150Pa)

High
Middle

Octave band center frequencies (Hz)

Low

NC-60

NC-50

NC-40

NC-30

NC-20

13

PEAD-A36AA

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa)

High
Middle

Octave band center frequencies (Hz)

Low

NC-60

NC-50

NC-40

NC-30

NC-20

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

Octave band center frequencies (Hz)

High
Middle

Low

NC-60

NC-50

NC-40

NC-30

NC-20

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.20 [in.WG] (50Pa)

High
Middle

Octave band center frequencies (Hz)

Low

External static pressure 0.28 [in.WG] (70Pa)

High
Middle

Octave band center frequencies (Hz)

Low

NC-60

NC-50

NC-40

NC-30

NC-20

NC-60

NC-50

NC-40

NC-30

NC-20

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.60 [in.WG] (150Pa)

High
Middle

Octave band center frequencies (Hz)

Low

NC-60

NC-50

NC-40

NC-30

NC-20

14

PEAD-A42AA

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.14 [in.WG] (35Pa) External static pressure 0.40 [in.WG] (100Pa)

High
Middle

Octave band center frequencies (Hz)

Low

NC-60

NC-50

NC-40

NC-30

NC-20

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

Octave band center frequencies (Hz)

High
Middle

Low

NC-60

NC-50

NC-40

NC-30

NC-20

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.20 [in.WG] (50Pa)

High
Middle

Octave band center frequencies (Hz)

Low

External static pressure 0.28 [in.WG] (70Pa)

High
Middle

Octave band center frequencies (Hz)

Low

NC-60

NC-50

NC-40

NC-30

NC-20

NC-60

NC-50

NC-40

NC-30

NC-20

70.0

65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0

Approximate minimum

10.0
audible limit on

continuous noise

5.0

0.0
63 125 250 500 1k 2k 4k 8k

External static pressure 0.60 [in.WG] (150Pa)

High
Middle

Octave band center frequencies (Hz)

Low

NC-60

NC-50

NC-40

NC-30

NC-20

15

6

OUTLINES & DIMENSIONS

INDOOR UNIT

PEAD-A24, 30, 36, 42AA

Unit:mm(in.)

Access door

777(30-5/8)

(11-13/16)

More than 300

450(17-3/4)

450(17-3/4)

(11-13/16)

Less than 300

0

-10

65

0

-7/16

(Actual length)

Less than 700

(27-9/16)

<accessory>

Drain hose (I.D.ø32(1-1/4))

Access door

(4-7/16) (4-7/16)

(7/16)

JKX(L-1)=MJ6

112 112 11

50(2)

H

50(2)

210

(8-5/16)

18(3/4)

Note2

Note 4

Suspension bolt hole

4-14x30(9/16X1-3/16) Slot

Fresh air intake ø100(3-15/16)

knock out hole

153(6-1/16)

378(12-7/16)

(5-3/8)

3-ø2.9(1/8) mounting hole

135

120

120

125

ø

(4-15/16)

200(7-7/8)

2xE-ø2.9(1/8)

(Emergency draining)

Drain pipe(O.D. ø32(1-1/4))

15(5/8)

40

(1-5/8)

250~300

(9-7/8~11-13/16)

(2-9/16 )

Required space for service and maintenance

Air filter

G

C

B(Suspension bolt pitch)

A

Air

inlet

Air

outlet

100(3-15/16)X(E-1)=F30(1-3/16)

D(Duct)

10(7/16)

100(3-15/16)

58

(2-5/16)

40(1-5/8)

78(3-1/8)

21

21(7/8)

23(15/16)

643(25-3/8)

(Suspension bolt pitch)

(2-1/4)
57

20

(13/16)

732(28-7/8)

57(2-1/4)

250(9-7/8)

(O.D.ø32(1-1/4))

Drain pipe

(27-9/16)32(1-5/16)

700

(9-3/8)

238

10(7/16)

Refrigerant piping

2

(4-13/16)

Ceiling surface

More than 20(13/16)

More than 10(7/16)

217(8-9/16)

41(1-5/8)

Control box

Drain pump

Terminal block(Remote controller transmission line)

67136

(2-11/16)

(5-3/8)

2X2-ø2.9(1/8)

Refrigerant piping

flare connection (gas)

flare connection (liquid)

122

40(1-5/8)

23(15/16)178(7-1/16)

1

33(1-5/16)

K

Make the access door at the appointed position properly for service maintenance.

(1/4)

N-ø2.9(1/8)

(3/8)

ø9.52

Liquid pipe

2

(5/8)

Gas pipe

ø15.88

1

12

10

MLKJN

(39)

990

1280

(50-7/16)

5

4

(13)(1-15/16)

330

(12-5/8)

54 320

49

(2-3/16)(59-1/16)

H

1200

1500

Drain pipe(O.D.ø32(1-1/4))(Spontaneous draining)

Terminal block(Indoor/Outdoor connection line)

356(1/16)

100(3-15/16)

GFBCDE

1058

1000

11

1200

1154 1060

A

1100

(47-1/4)

(41-11/16)

1300 1358

(51-3/16) (53-1/2)

14

136015001454

(41-3/4) (39-3/8)

(53-9/16)

(59-1/16)

(45-7/16) (47-1/4)

1400

(55-1/8) (57-1/4)

(43-5/16)

Model

PEAD-A24, 30AA

PEAD-A36, 42AA

NOTE 1. Use M10 screw for the Suspension bolt (field supply).

2. Keep the service space for the maintenance at the bottom.

3. This chart indicates for PEAD-A24·30·36·42AA models,which have 2 fans.

4. In case of the inlet duct is used,remove the air filter (supply with the unit), then install the filter (field supply) at suction side.

16

7

WIRING DIAGRAM

PEAD-A24, 30, 36, 42AA

CN44

NAME

SW6

SW1

SW2

OFF

ON

SW5

CN4F

1
2
3
4

CN32

LED2

CN41

SWE

CN51

CNXB2

1

(Red)

(Red)

CN20

2

CN2L

3
4

1

5

2

t˚

TH1

Indoor controller board

I.B.

Switch (for mode selection)

SW1

Switch (for capacity code)

SW2

Switch (for model selection)

SW5

Switch (for model selection)

SW6

Connector (emergency operation)

SWE

Power supply board

P.B.

Fuse AC250V 6.3A

F01

Varistor

ZNR01,02

Arrester

DSA

Aux. relay

X01

Aux. relay

X10

CNXC2

1
2

1
2
3
4

FS

1

CN3C
(Blue)

3

CN90

LED3

t˚

t˚

TH5

TH2

SYMBOL EXPLANATION

SYMBOL SYMBOL NAME

I.B.

Indoor controller board
Connector (0-10V Analog input)

CN2A

Connector (Lossnay)

CN2L

Connector (Remote switch)

CN32

Connector (HA terminal-A)

CN41

Connector (Centrally control)

CN51

Connector (Wireless)

CN90

Connector (IT terminal)

CN105

LED(Power supply)

LED1

LED(Remote controller supply)

LED2

LED(Transmission indoor-outdoor)

LED3

CN105

(Red)

CN2A
(Black)

CN22

(Blue)

LED1

I.B.

2
1

CNXA2

(Blue)

INSIDE SECTION OF CONTROL BOX

ACL

1

2

P.B.

CND

351

(Red)

DSA

U
ZNR02

(Blue)

4
3
2
1

CNP

1

3

CNXB1

3214

M

1~

Drainpump

Intake air temp. Thermistor

TH1
TH2

Pipe temp. Thermistor/liquid
Cond./eva.temp. Thermistor

TH5
ACL

AC reactor(Power factor improvement)

FS

Float switch

Terminal block

TB4

(Indoor/outdoor connecting line)

Terminal block

TB15

(Remote controller transmission line)

F01

ZNR01

U

DC280-340V

CNXC1

(Blue)

12321

X10

4

Rectifier circuit

CNMFCNXA1

45671

MS

3~

X01

5

Fan motor

NAMESYMBOL

NOTE:1.Since the outdoor side electric wiring may change be sure to

check the outdoor unit electric wiring for servicing.

2.Indoor and outdoor connecting wires are made with polarities, make
wiring matching terminal numbers(S1,S2,S3).

3.Symbols used in wiring diagram above are, terminal block,

4.Use copper supply wire.

TB15

1
2

TB4

S1

1

S2

2

S3

connector.

TO MA REMOTE
CONTROLLER

TO OUTDOOR UNIT

17

8

REFRIGERANT SYSTEM DIAGRAM

PEAD-A24, 30, 36, 42AA

Heat exchanger

Thermistor TH1
(Room temperature)

Distributor
with strainer (#50)

Thermistor TH5
(Cond./ Eva.temperature)

Thermistor TH2
Pipe temperature(Liquid)

Strainer (#50)

Refrigerant GAS pipe connection
(Flare)

Refrigerant LIQUID pipe connection
(Flare)

Strainer (#50)

Refrigerant flow in cooling
Refrigerant flow in heating

9

HEATER CONTROL

9-1. CONTROL SPECIFICATIONS AND FUNCTION SETTING

Table 1 shows how the field-installed heater is controlled. Select the desired pattern in the table below, and set the

Function on the indoor units as shown in Table 1.

Table.1 [Function table]
Select unit numbers 01 to 03 or all units (AL[wired remote controller] / 07[wireless remote controller])

Mode Setting Mode no. Setting

Heater control

Heater OFF

Inlet air temp. set temp.

Heater ON

Inlet air temp. < set temp.-4.5˚F(2.5˚C)

The fan will stop and the heater will turn off when
[DEFROST] or [ERROR] is displayed.

Set temp.

Inlet air tem p.

Heater output

Heater OFF

Inlet air temp. set temp.

Heater ON

Inlet air temp. < set temp.-1.8˚F(2.5˚C)

The fan will drive and the heater will turn on when
[DEFROST] or [ERROR] is displayed.

Inlet a ir tem p.

Set temp.-1.8
Set tem p.-4. 5

ON

OFF

Set tem p.
Set tem p.-1.8

˚

F(1˚C)

˚

F(2.5˚C)

˚

F(2.5˚C)

23 1

23 2 -

Initial setting

Heater output

*Refer to the Installation Manual for function settings.

ON
OFF

18

9-2. FAN CONTROL

By setting the Mode No. 23 in the Function Table in section 9-1 to 2 and using CN4Y on the optional parts PAC-YU25HT, the
following patterns of fan control will become possible when [DEFROST] or [ERROR] is displayed.

Fan control patterns when [DEFROST] or [ERROR] is displayed

Heater is installed in the duct. No heater is installed in the duct.
Use of CN4Y (PAC-YU25HT)
Heater is off.

Heater is on.

* If a heater is installed in the duct, do not use CN4Y. By doing so, the fan will turn off when the heater is on,
which may result in fire.

*1 Fan speed setting

Mode

Fan control

*Refer to the Installation Manual for function settings.

Heating Thermo-OFF [DEFROST] or [ERROR]

Very low

STOP

Remote controller setting

Unused*

Fan ON*1

Fan ON*1

Setting

Remote controller setting

Remote controller setting

Very low

Mode no. Setting

25

25

25

Used

Fan OFF

Fan OFF

1

2

3

Initial setting

-

-

9-3. PAC-YU25HT (OPTIONAL PARTS) INSTALLATION

The following section describes installation of the External Heater Adapter that connects to PEAD-A AA
series indoor unit. This products is the special wiring parts to drive an electric heater with the air conditioner.

(1) Parts list

Check that the following parts are included in the package.

1) External output cable (with a yellow connector).............................2 in total

Two types of cables with different connectors are included.

2) Panel heater connector.................................................................. 3 in total

White: 1
Green: 2 (2 types)

(2) Connection to the indoor unit

Use the cables that fit the connectors on the indoor unit control board.

1) External output cable (with a yellow connector)
This cable is used to connect a relay circuit for an interlocked operation with either an electric or a panel heater.
Connect the cable to CN24 on the indoor unit control board.

2) Panel heater connector (with a white connector)
This connector is used to perform an interlocked operation with a panel heater. Depending on the indoor unit
control board specification, connect the cable to CN4Y as appropriate

<Image>

CN4Y for FAN control
(PAC-YU25HT)

19

(3) Locally procured wiring

A basic connection method is shown below.

Remote control board Relay circuit

Electric Heater

power source

Electric Heater
or panel
heater

Preparations in the field

X

Adapter

Red 1

X

White 2

White 1

(applicable only when a panel
heater is connected)

Maximum cable length
is 10 m (32ft)

3

Indoor unit
control board

YellowWhite

CN24

CN4Y

For relay X use the specifications given below Operation coil

Rated voltage: 12VDC
Power consumption: 0.9W or less
* Use the diode that is recommended by the relay manufacturer at both ends of the relay coil.

The length of the electrical wiring for the PAC-YU25HT is 2 meters (6-1/2 ft.)
To extend this length, use sheathed 2-core cable.

Control cable type: CVV, CVS, CPEV or equivalent.
Cable size: 0.5 mm

2

~ 1.25 mm2 (16 to 22 AWG)

Don't extend the cable more than 10 meters (32ft)

Recommended circuit

Wiring diagram

1-phase
power supply

208V, 230V/60Hz

R

S

R

S

Control board

88H

88H

CN24

88H

FS1

FS2
FS1

FS2

26H

H1

H2

FS1, 2 ----- Thermal fuse

H1, H2 ----- Heater

26H --------- Overheat

88H --------- Electromagnetic contactor

protection thermostat

(4) Wiring restrictions

Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters (32ft).
Longer than 10 meters (32ft) could cause improper operation.
Use a transit relay when extending wiring such as remote wiring.

20

10

Lead wires

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

B

C

A

E D F

ERROR CODE

A
B
C
D

E
F

1 Check code Symptom Remark

P1 Intake sensor error
P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error
E6,E7 Indoor/outdoor unit communication error
P4 Drain sensor error
P5 Drain pump error
P6 Freezing/Overheating protection operation
EE Communication error between indoor and outdoor units
P8 Pipe temperature error
E0, E3~E5 Remote controller transmission error
E1, E2 Remote controller control board error
Fb Indoor unit control system error (memory error, etc.)
E9 Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UP Compressor overcurrent interruption
U3,U4 Open/short of outdoor unit thermistors
UF Compressor overcurrent interruption (When compressor locked)
U2 Abnormal high discharging temperature/49C worked/insufficient refrigerant
U1,Ud Abnormal high pressure (63H worked)/Overheating protection operation
U5 Abnormal temperature of heat sink
U8 Outdoor unit fan safeguard stop
U6 Compressor overcurrent interruption/Abnormal of power module
U7 Abnormality of super heat due to low discharge temperature
U9,UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit

/Current sensor error

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

For details, check the LED display
of the outdoor controller board.
As for outdoor unit, refer to
service manual OCH458.

• On wired remote controller.

1 Check code displayed in the LCD.

• For description of each check code, refer to the following table.

TROUBLESHOOTING

10-1. CAUTIONS ON TROUBLESHOOTING

(1) Before troubleshooting, check the followings:

1 Check the power supply voltage.
2 Check the indoor/outdoor connecting wire for mis-wiring.

(2) Take care the followings during servicing.

1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn

off the breaker.

2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the

components.

3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

10-2. SELF-CHECK FUNCTION

Wired remote controller

(1) Turn on the power.
(2) Press the [CHECK] button twice.
(3) Set refrigerant address with [TEMP] button

if system control is used.

(4) Press the [ON/OFF] button to stop the

self-check.

A

CHECK button

B

Indoor Unit’s Refrigerant address

C

TEMP button

D

IC : Indoor unit
OC : Outdoor unit

E

Check code

F

Indoor Unit No.

21

•

If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause.

Symptom

Cause

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

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

• No signals from the remote controller are accepted.

• Operation lamp is blinking.

• The buzzer makes a short piping sound.

PLEASE WAIT

PLEASE WAIT → Error code

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

For about 2
minutes after
power-on

After about 2
minutes has
expired after
power-on

After LED 1, 2 are lighted, LED 2 is

turned off, then only LED 1 is

Only LED 1 is lighted. →

LED 1, 2 blink.

Only LED 1 is lighted.

→

LED 1 blinks twice,
LED 2 blinks once.

•For about 2 minutes after 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, L3)

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

•Remote controller wire short

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

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

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

always lit.

LED2 (power for remote controller)

Indicates whether power is supplied to the remote controller.
This LED lights only in the case of the indoor unit which is connected to the
outdoor unit refrigerant address “0”.

LED3 (communication between indoor and
outdoor units)

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

lighted.

(Correct operation)

Wireless remote controller

A

B
B

C

D

(1) Turn on the power to the unit at least 12 hours before the test run.
(2) Press the TEST RUN button

(Start this operation from the status of remote controller display turned off.)

TEST RUN

and current operation mode are displayed.
(3) Press the MODE button
(4) Press the MODE button
(5) Press the FAN button
(6) Press the VANE button

(7) Press the ON/OFF button to stop the test run.

Note:

• Point the remote controller towards the indoor unit receiver while following steps (2) to (7).

• It is not possible to run the in FAN, DRY or AUTO mode.

A

C

twice continuously.

B

to activate COOL mode, then check whether cool air is blown out from the unit.

B

to activate HEAT mode, then check whether warm air is blown out from the unit.

and check whether fan speed changes.

D

and check whether the auto vane operates properly.

22

• If the unit cannot be operated properly after the above test run has been performed, refer to the following table to remove the cause.

On the wireless remote controller with conditions above, following phenomena takes place.

• No signals from the remote controller are accepted.

• 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)

PLEASE WAIT

PLEASE WAIT →Error code

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

Symptom

After LED 1, 2 are lighted, LED 2 is turned
off, then only LED 1 is lighted. (Correct
operation)

Only LED 1 is lighted.

→

LED 1, 2 blink.

Only LED 1 is lighted. →LED 1, 2 blinks
twice, LED 2 blinks once.

• For about 2 minutes after 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, L3)

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

• Remote controller wire short

For about 2 minutes

following power-on

After about 2 min­utes has expired

following power-on

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

Cause

[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)

Wireless remote controller

Beeper sounds/OPERATION INDICATOR

lamp flashes (Number of times)

1
2
3
4
5
6
7
8
9

10

11

12
13
14

Symptom

Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/49C worked/ insufficient refrigerant
Abnormal high pressure (63H worked)/ Overheating safeguard operation
Abnormal temperature of heat sink
Outdoor unit fan protection stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality of super heat 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.)

Remark

For details, check the LED
display of the outdoor controller
board.

[Output pattern A] Errors detected by indoor unit

Wireless remote controller

Beeper sounds/OPERATION

INDICATOR lamp flashes

(Number of times)

1
2
3
4
5
6
7
8

9
10
11
12

No sound

Wired remote

controller

Check code

P1
P2, P9
E6, E7
P4
P5
P6
EE
P8
E4
–
–
Fb
– –

Symptom

Intake sensor error
Pipe (Liquid or 2-phase pipe) sensor error
Indoor/outdoor unit communication error
Drain sensor error
Drain pump error
Freezing/Overheating safeguard operation
Communication error between indoor and outdoor units
Pipe temperature error
Remote controller signal receiving error
–
–
Indoor unit control system error (memory error, etc.)
No corresponding

Remark

*1 If the beeper does not sound again after the initial two beeps to confirm the self-check start signal was received and the OPERATION INDICATOR lamp does not

come on, there are no error records.

*2 If the beeper sounds three times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial two beeps to confirm the self-check start signal was

received, the specified refrigerant address is incorrect.

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

• On wired remote controller
Check code displayed on the LCD.

23

Indicates whether control power is supplied. Make sure that this LED is always lit.

Indicates whether power is supplied to the remote controller. This LED lights only in the case of

the indoor unit which is connected to the outdoor unit refrigerant address “0”.

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

always blinking.

LED 1 (power for microcomputer)

LED 2 (power for remote controller)

LED 3 (communication between indoor and outdoor units)

AUTO RESTART FUNCTION

Indoor controller board

This model is equipped with the AUTO RESTART FUNCTION.
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor controller board.
The auto restart function sets to work the moment the power has restored after power failure, then, the unit will restart automatically.
Set the AUTO RESTART FUNCTION using the wireless remote controller. (Mode no.1).

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

24

10-3. SELF-DIAGNOSIS ACTION TABLE

Error Code

P1

P2

Abnormal point and detection method

Room temperature
thermistor (TH1)

1 The unit is in three-minute resume

prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after three
minutes. (The unit returns to normal
operation, if it has normally reset.)

2 Constantly detected during cooling,

drying and heating operation
Short: 90˚C[194˚F] or more
Open: -40˚C[-40˚F] or less

Pipe temperature
thermistor/Liquid (TH2)

1 The unit is in three-minute resume

prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after three
minutes. (The unit returns to normal
operation, if it has normally reset.)

2 Constantly detected during cooling,

drying, and heating (except defrosting)
operation.
Short: 90˚C[194˚F] or more
Open: -40˚C[-40˚F] or less

1 Defective thermistor

2 Contact failure of connector

3 Breaking of wire or contact

4 Defective indoor controller

1 Defective thermistor

2 Contact failure of connector

3 Breaking of wire or contact

4 Defective refrigerant circuit is

5 Defective indoor controller board

Note: Refer to the manual of outdoor unit for the details of display

such as F, U, and other E.

Cause

characteristics

(CN20) on the indoor controller
board (Insert failure)

failure of thermistor wiring

board

characteristics

(CN44) on the indoor controller
board (Insert failure)

failure of thermistor wiring

causing thermistor temperature
of 90˚C[194˚F] or more or

-40˚C[-40˚F] or less.

Countermeasure

1–3 Check resistance value of thermistor.
0

:[32˚F].......15.0k"

10:[50˚F].....9.6k"

20:[68˚F].....6.3k"

30:[86˚F].....4.3k"

40:[104˚F]...3.0k"
If you put force on (draw or bend) the lead wire
with measuring resistance value of thermistor
breaking of wire or contact failure can be
detected.

2 Check contact failure of connector (CN20) on

the indoor controller board. Refer to 10-5.
Turn the power on again and check restart
after inserting connector again.

4 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.

1–3 Check resistance value of thermistor.
For characteristics, refer to (P1) above.

2 Check contact failure of connector (CN44) on

the indoor controller board. Refer to 10-5.
Turn the power on again and check restart
after inserting connector again.

4 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 defective.
Check pipe <liquid> temperature with remote

5

controller in test run mode. If there is extreme
difference with actual pipe <liquid> temperature,
replace indoor controller board.

P4

(5701)

P5

Contact failure of drain float switch (CN4F)

1 Extract when the connector of drain float

switch is disconnected.

3 and 4 of connector CN4F is not

(
short-circuited.)

2 Constantly detected during operation.

Drain overflow protection operation

1 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.

2 Drain pump is abnormal if the condition

above is detected during suspensive
abnormality.

3 Constantly detected during drain pump

operation.

1 Contact failure of connector

(Insert failure)

2 Defective indoor controller

board

1 Malfunction of drain pump
2 Defective drain

Clogged drain pump
Clogged drain pipe

3 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)

4 Defective indoor-controller

board

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

1 Check contact failure of float switch connec-

tor.
Turn the power on again and check after
inserting connector again.

2 Operate with connector (CN4F) short-circuited.

Replace indoor controller board if abnormali­ty reappears.

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

3 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.

4 Replace indoor controller board if it is short-

circuited between 3-4 of the drain float
switch connector CN4F and abnormality
reappears.

It is not abnormal if there is no problem about
the above-mentioned 1~4

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

25

Error Code

P6

Abnormal point and detection method

Freezing/overheating protection is
working

1 Freezing protection (Cooling mode)

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

-15:[5˚F] for three minutes after the
compressor started. Abnormal if it stays
under -15
within 16 minutes after six-minute
resume prevention mode.

2 Overheating protection (Heating mode)

The units is in six-minute resume
prevention mode if pipe <Liquid or con­denser / evaporator> temperature is
detected as over 70:[158˚F] after the
compressor started. Abnormal if the
temperature of over 70:[158˚F] is
detected again within 10 minutes after
six-minute resume prevention mode.

:[5˚F] for three minutes again

Cause

(Cooling or drying mode)

1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Low-load (low temperature)

operation beyond the tolerance
range

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is
defective.

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

(clogs)

(Heating mode)

1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Over-load (high temperature)

operation beyond the tolerance
range

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is
defective.

Countermeasure

(Cooling or drying mode)

1 Check clogging of the filter.
2 Remove shields.

4 Refer to 10-8. DC Fan motor (FAN MOTOR/

INDOOR CONTROLLER BOARD)

5 Check outdoor fan motor.
67 Check operating condition of refrigerant

circuit.

(Heating mode)

1

Check clogs of the filter.

2 Remove shields.

4 Refer to 10-8. DC Fan motor (FAN MOTOR/

INDOOR CONTROLLER BOARD)

P8

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

drying mode.

Cooling range :

-3 deg˚C(-5.4deg˚F) ] (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

detect abnormality.

Note 4) It excludes the period of defrosting

(Detection restarts when defrost­ing mode is over)

Heating range :

3 deg˚C(5.4deg˚F) [ (TH5-TH1)

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

(clogs)

8 Bypass circuit of outdoor unit

is defective.

1 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

2 Converse connection of

extension pipe (on plural units
connection)

3 Converse wiring of indoor/

outdoor unit connecting wire
(on plural units connection)

4 Defective detection of indoor

room temperature and pipe
<condenser / evaporator>
temperature thermistor

5 Stop valve is not opened

completely.

5 Check outdoor fan motor.
6~8Check operating condition of refrigerant

circuit.

1~4 Check pipe <liquid or condenser /

evaporator> 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)’.

23Check converse connection of extension

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

)

26

Error Code

P9

Abnormal point and detection method

Abnormality of pipe temperature ther­mistor / Condenser-Evaporator (TH5)

1 The unit is in three-minute resume pro-

tection mode if short/open of thermistor
is detected. Abnormal if the unit does
not get back to normal within three min­utes. (The unit returns to normal opera­tion, if it has normally reset.)

2 Constantly detected during cooling, dry-

ing, and heating operation (except
defrosting)
Short: 90˚C[194˚F] or more
Open: -40˚C[-40˚F] or less

Cause

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN44) on the indoor controller
board (Insert failure)

3 Breaking of wire or contact

failure of thermistor wiring

4 Temperature of thermistor is

:[194˚F] or more or

90

-40˚C[-40˚F] or less caused by
defective refrigerant circuit.

5 Defective indoor controller

board

Countermeasure

1–3 Check resistance value of thermistor.

For characteristics, refer to (P1) above.

2 Check contact failure of connector (CN44)

on the indoor controller board.
Refer to 10-5.
Turn the power on and check restart after
inserting connector again.

4 Operate in test run mode and check pipe

<condenser / evaporator> temperature.
If pipe <condenser / evaporator> tempera­ture is extremely low (in cooling mode) or
high (in heating mode), refrigerant circuit
may have defect.

5 When no problems are found in 1-4 above,

replace the indoor unit control board.

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

1 Abnormal if main or sub remote con-

troller can not receive normally any
transmission from indoor unit of refriger­ant address “0” for three minutes.
(Error code : E0)

2 Abnormal if sub remote controller could

not receive for any signal for two min­utes. (Error code: E0)

1 Abnormal if indoor controller board can

E0

or

E4

E3

or

E5

not receive normally any data from
remote controller board or from other
indoor controller board for three minutes.
(Error code: E4)

2 Indoor controller board cannot receive

any signal from remote controller for two
minutes. (Error code: E4)

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

1 Abnormal if remote controller could not

find blank of transmission path for six
seconds and could not transmit.

(Error code: E3)

2 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)

1 Abnormal if indoor controller board could

not find blank of transmission path.

(Error code: E5)

2 Indoor controller board receives trans-

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

1 Contact failure at transmission

wire of remote controller

2 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.

3 Mis-wiring of remote controller
4 Defective transmitting receiving

circuit of remote controller

5 Defective transmitting receiving

circuit of indoor controller board
of refrigerant address “0”

6 Noise has entered into the

transmission wire of remote
controller.

1 Two remote controller are set

as “main.”
(In case of 2 remote con-

trollers)

2 Remote controller is connected

with two indoor units or more.

3 Repetition of refrigerant

address

4 Defective transmitting receiving

circuit of remote controller

5 Defective transmitting receiving

circuit of indoor controller
board

6 Noise has entered into trans-

mission wire of remote con­troller.

1 Check disconnection or looseness of indoor

unit or transmission wire of remote controller.

2 Set one of the remote controllers “main”.

If there is no problem with the action above.

3 Check wiring of remote controller.

• Total wiring length: max.500m
(Do not use cable ✕ 3 or more)

• The number of connecting indoor units:

max.16units

• The number of connecting remote con-

troller: max.2units

When it is not the above-mentioned problem of

1~3
4 Diagnose remote controllers.

a) When “RC OK” is displayed,

Remote controllers 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” is displayed,
d) When “ERC 00-06” is displayed,
[ c),d)→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.

1 Set a remote controller to main, and the

other to sub.

2 Remote controller is connected with only one

indoor unit.

3 The address changes to a separate setting.

4~6 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 displayed,

noise may be causing abnormality.

27

Error Code

E6

E7

Fb

E1

or

E2

Abnormal point and detection method

Indoor/outdoor unit communication
error (Signal receiving error)

1 Abnormal if indoor controller board

cannot receive any signal normally for
six minutes after turning the power on.

2 Abnormal if indoor controller board

cannot receive any signal normally for
three minutes.

3 Consider the unit as abnormal under the

following condition: When two or more
indoor units are connected to an
outdoor unit, indoor controller board
cannot receive a signal for three 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 “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.

Indoor controller board

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

Remote controller control board

1 Abnormal if data cannot be read normal-

ly from the nonvolatile memory of the
remote controller control board.

(Error code: E1)

2 Abnormal if the clock function of remote

controller cannot be operated normally.

(Error code: E2)

Cause

1 Contact failure, short circuit or,

mis-wiring (converse wiring) of
indoor/outdoor unit connecting
wire

2 Defective transmitting receiving

circuit of indoor controller board

3 Defective transmitting receiving

circuit of indoor controller board

4 Noise has entered into indoor/

outdoor unit connecting wire.

1 Defective transmitting receiving

circuit of indoor controller board

2 Noise has entered into power

supply.

3 Noise has entered into outdoor

control wire.

1 Defective indoor controller

board

1 Defective remote controller 1 Replace remote controller.

∗ Check LED display on the outdoor control cir-

cuit board. (Connect A-control service tool,
PAC-SK52ST.)
Refer to EA-EC item if LED displays EA-EC.

1 Check disconnection or looseness of indoor/

outdoor unit connecting wire of indoor unit or
outdoor unit.

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

2-4 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 triple indoor unit
system.

1-3 Turn the power off, and on again to check.

If abnormality generates again, replace
indoor controller board.

1 Replace indoor controller board.

Countermeasure

PA

(2500)

Water leakage

This detection is performed during the
operation (stop, heating, fan, or error stop
mode etc.) other than cooling and dry.
1 When a) and b) are found, water leakage

occurs.
a) Pipe <liquid> temperature - inlet tem-

perature < -10˚C for 30 minutes

b) When drain float switch is detected to

be soaked in the water for 15 minutes
or more.

* When drain float switch is detected to

be NOT soaked in the water, each
counting of a) and b) is cleared.

*When this error is detected, the error
will not be reset until the main power is
reset.

1 Mis-piping of extension pipes

(When connected with multiple
units)

2 Mis-wiring of indoor/outdoor

unit connecting wire (When
connected with multiple units)

3 Detection failure of the indoor

unit inlet/pipe <liquid> thermis­tor

4 Drain pump failure

5 Drainage failure

· Clogged drain pump

· Clogged drain pipe

6 Drain float switch failure

· Drain float switch is detected
to be soaked in the water (ON
status) due to the operation
failure of the moving parts.

· Contact failure of drain float
switch connector
(Loose connector)

1Check the extension pipes for mis-piping.

2Check the Indoor/outdoor unit connecting

wire for mis-wiring.

3Check room temperature display on remote

controller and indoor pipe <liquid> tempera­ture. (Refer to the countermeasure on P2.)

4Check if drain-up machine works.

5 Check drain function.

6Check drain float switch. (Refer to the coun-

termeasure on P4 and P5.)

28

10-4. TROUBLESHOOTING BY INFERIOR PHENOMENA

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

controller.

Phenomena

(1)LED2 on indoor controller board

is off.

• When LED1 on indoor controller board is also off.

1 Power supply of rated voltage is not supplied to out-

door unit.

2 Defective outdoor controller circuit board

3 Power supply of 208~230V is not supplied to indoor

unit.

4 Defective indoor controller board

Cause

Countermeasure

1 Check the voltage of outdoor power

supply terminal block (L, N) or (L

• When AC 208~230V is not detected.
Check the power wiring to outdoor unit
and the breaker.

• When AC 208~230V is detected.

—Check 2 (below).

2 Check the voltage between outdoor

terminal block S1 and S2.

• When AC 208~230V is not detected.

Check the fuse on outdoor controller
circuit board.

Check the wiring connection.

• When AC 208~230V is detected.

—Check 3 (below).

3 Check the voltage between indoor terminal

block S1 and S2.

• When AC 208~230V is not detected.
Check indoor/outdoor unit connecting
wire for mis-wiring.

• When AC 208~230V is detected.

—Check 4 (below).

4 Check the fuse on indoor controller board.

Check the wiring connection.
If no problem are found, indoor controller
board is defective.

3, N).

(2)LED2 on indoor controller board

is blinking.

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

• When LED1 is lit.

1 Mis-wiring of remote controller wires

Under twin triple indoor unit system, 2 or more indoor
units are wired together.

2 Refrigerant address for outdoor unit is wrong or not

set.

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

3 Short-cut of remote controller wires
4 Defective remote controller

Check indoor/outdoor unit connecting wire
for connection failure.

1 Check the connection of remote con-

troller wires in case of twin triple indoor
unit system. When 2 or more indoor units
are wired in one refrigerant system,
connect remote controller wires to one of
those units.

2 Check the setting of refrigerant address

in case of grouping control system.

If there are some units whose refrigerant
addresses are 0 in one group, set one of
the units to 0 using SW1 (3-6) on outdoor
controller circuit board.

34 Remove remote controller wires and

check LED2 on indoor controller board.

• When LED2 is blinking, check the
short-cut of remote controller wires.

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

if LED2 is blinking, remote controller
is defective; if LED2 is lit, connection
failure of remote controller terminal
block etc. has returned to normal.

29

CND Power supply voltage (208 - 230VAC)

CNMF Fan motor output

1 - 4: 310 - 340 VDC
5 - 4: 15 VDC
6 - 4: 0 - 6.5 VDC
7 - 4: Stop 0 or 15 VDC
Run 7.5 VDC

(0 - 15 pulse)

CNP Drain-up mechanism output (200VAC)

CNXA1

Connect to the indoor controller board

CNXB1

Connect to the indoor controller board

CNXC1

Connect to the indoor controller board

CNXA2

Connect to the indoor power board

CNXB2

Connect to the indoor power board

CNXC2

Connect to the indoor power board

(*1)

V

FG

Voltage on the (-) side of PC51 and
C25
(Same with the voltage between 7 (+)
and 4 (-) of CNMF)

V

CC

Voltage between the C25 pins 15
VDC
(Same with the voltage between 5 (+)
and 4 (-) of CNMF)

V

sp Voltage between the C53 pins

0VDC (with the fan stopped)
1 - 6.5VDC (with the fan in operation)
(Same with the voltage between 6 (+)
and 4 (-) of CNMF)

CND

CNP

CNXB1 CNXC1

CNXA1 CNMF

PC51

(*1)

C25

(*1)

C53
(*1)

10-5. TEST POINT DIAGRAM

10-5-1. Power supply board

PEAD-A24AA
PEAD-A30AA
PEAD-A36AA
PEAD-A42AA

30

10-5-2. Indoor controller board

SWE Emergency operation

SW1 Model selection

SW2 Capacity setting

CN32 Remote start/stop adapter

CN22 For MA remote controller cable con-

nection
(10 - 13 VDC (Between 1 and 3.))

CN51 Centralized control

CN41 JAMA standard HA terminal A

CN44 Thermistor

(liquid/condenser/evaporator
temperature)

CN4F Float thermistor

CN20 Thermistor (Inlet temperature)

CN24 Heater control (12VDC)

CN4Y For fan control

CN3C Indoor-outdoor transmission

(0 - 24VDC)

CN90 Wireless remote controller

CNXA2

Connect to the indoor controller board

CNXB2

Connect to the indoor controller board

CNXC2

Connect to the indoor controller board

CNXA1

Connect to the indoor power board

CNXB1

Connect to the indoor power board

CNXC1

Connect to the indoor power board

CN22

CN41

CN24

CN32

SW1
SW2

CN2L

SWE

CN51

CN3C

CN90

CN4Y

CN44

CN4F

CN20

CNXB2

CNXC2

CNXA2

PEAD-A24AA
PEAD-A30AA
PEAD-A36AA
PEAD-A42AA

31

10-6. TROUBLE CRITERION OF MAIN PARTS

Room temperature
thermistor
(TH1)

Condenser/evaporator
temperature thermistor
(TH5)

Measure the resistance with a tester.
(Part temperature 10°C (50°F) ~ 30°C (86°F))

Pipe temperature
thermistor/liquid
(TH2)

Wiring diagram

Check method and criterion

Part name

Normal

4.3kΩ~9.6kΩ

Abnormal

Opened or short-circuited

Motor

Board with build-in motor

Current detecting resistor

Regulator Hall IC

Motor winding

Powe r
device

Pre

driver

Vm (Power supply for motor)

Vcc (Power supply for control)

Vsp (Speed command voltage)

PG (Pulse output for rotation)

GND

0

10

20

30

40

50

-20 -10 0 10 20 30 40 50

< Thermistor for lower temperature >

Temperature

Resistance (K")

(˚C)

-4 14 32 50 68 86 104 122

˚F

PEAD-A24AA
PEAD-A30AA
PEAD-A36AA
PEAD-A42AA

10-7. Thermistor

<Thermistor Characteristic graph>

Thermistor R
Fixed number of B=3480k" ±2%

Rt=15exp { 3480( ) }

10°C (50°F) 9.6k"
20°C (68°F) 6.3k"
25°C (77°F) 5.2k"
30°C (86°F) 4.3k"
40°C (104°F) 3.0k"

Thermistor for
lower temperature

0=15k" ±3%

273+t

0°C (32°F) 15k"

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

1

1

273

32

10-8. DC FAN MOTOR (FAN MOTOR/INDOOR CONTROLLER BOARD)

Notes

· High voltage is applied to the connecter (CNMF) for the fan motor. Give 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

board and fan motor.)

Self check
Symptom : The indoor fan cannot turn around.

No

NG

NG

Wiring contact check

Contact of fan motor connector (CNMF)

Check the fuse (FUSE) on indoor
controller board.

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit

board.

TEST POINT

1 :VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC310~340V

TEST POINT 2 :VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V

Wiring recovery

Replace drain pump (DP).

Replace indoor controller board.

Replace the fan motor.

Replace indoor controller board (I.B).
Replace fan motor (MF).

Replace indoor

controller board.

Replace the fan motor.

Is the voltage normal?

Is there no contact failure?

Ye s

1

2

Ye s

No

Did the fuse blow?

Check the drain pump (DP)
Is the resistance between
terminals normal?

No

Ye s

Ye s

No

Check the operation of fan. END

Ye s

OK

Check the operation. END

OK

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

33

SW1

Setting by the dip switch and jumper wire

Functions

Jumper wire

Model
settings

Capacity
settings

Pair number
setting with
wireless
remote
controller

For service board

Remarks

SW2

J41
J42

Unit type
setting

JP1

Indoor
controller
board type
setting

JP3

0
1
2

3 ~ 9

Wireless remote
controller setting

Control PCB setting

J41 J42

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

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

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

Without TH5

With TH5

Model

JP1

Factory shipment

Service parts

Indoor controller board type

JP3

12345

ON

OFF

Service board

MODELS

1 2 3 4 5

PEAD-A24AA

ON
OFF

1 2 3 4 5

1 2 3 4 5

PEAD-A30AA

ON
OFF

PEAD-A36AA

1 2 3 4 5

ON
OFF

PEAD-A42AA

ON
OFF

10-9. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE

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

34

(A)

(B),(C)

11

DISASSEMBLY PROCEDURE

PEAD-A24AA
PEAD-A30AA
PEAD-A36AA
PEAD-A42AA

1. Control box

1. Removing the control box cover
(1) Remove the two fixing screws on the cover (A)

to remove it.

Exercise caution when removing heavy parts.

Fig. 1

2. Thermistor (Intake air)

1. Remove the control box cover according to the
procedure in section [1].

(1) Pull out the thermistor holder (B) and thermis-

tor (C) on the control box.

Fig. 2

Fig. 3

35

3. Drainpan

(D)

(E)

1. Removing the filter and the bottom plate

(1) Push up the tab on the filter, and pull out the

filter in the direction of the arrow 1.

(2) Remove the fixing screws on the bottom plate

(D), (E) to remove it.

2. Removing the drainpan

(1) Pull out the drain pan in the direction of the

arrow 2.

Exercise caution when removing heavy parts.

Fig. 4

Fig. 5

36

4. Thermistor (Condenser/evaporator)

(F)

(G),(H)

(Liquid pipe)

1. Remove the drain pan according to the proce­dure in section [3].

2. Removing the Heat exchanger cover

(1) Remove the four fixing screws on the heat

exchanger cover (F) to remove it.

Exercise caution when removing heavy parts.

Fig. 6

3. Removing the thermistor

(1) Remove the thermistor (G) from the thermistor

holder (H) on the copper tube.

Thermistor size
Liquid pipe: ø8mm
Condenser/evaporator: ø6mm

Fig. 7

37

5. Fan and fan motor

(J)

1. Removing the filter and the bottom plate

(1) Push down the tab on the filter, and pull out

the filter in the direction of the arrow 1.

(2) Remove the fixing screws on the bottom plate

(J) to remove it.

2. Removing the fan casing (bottom half)

(1) Squeeze the tabs on the fan casing to remove

it in the direction of arrow 2.

Exercise caution when removing heavy parts.

Fig. 8

3. Removing the motor cable

(1) Remove the motor cable threw the rubber

bush.

4. Removing the fan motor and the Sirocco fan

(1) Remove the two motor fixing screws to

remove the motor and the Sirocco fan in the
direction of arrow 3.

(2) Remove the four fan case fixing screws to

take the top half of the fan casing off.

Fig. 9

Fig. 10

Fig. 11

38

6. Heat exchanger

(K)

(L)

1. Remove the drain pan according to the proce­dure in section [3].

2. Remove the heat exchanger cover according to
the procedure in section [4] 2.

3. Removing the cover

(1) Remove the five fixing screws on the cover (K)

to remove it.

4. Removing the Heat exchanger

(1) Remove the fixing screws on the heat

exchanger (L) to remove it.

Exercise caution when removing heavy parts.

Fig. 12

Fig. 13

39

New publication, effective Jul. 2009.

Specifications subject to change without notice.

HWE09050

Printed in Japan

TM