Mitsubishi PLA-RP_AA(1), PLA-RP_AA(1).UK, PEA-RP_EA, PEAD-RP_EA, PEAD-RP_EA.UK TECHNICAL MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

No. OCT04

SERVICE TECHNICAL GUIDE

<Indoor unit>
[Model names] [Service Ref]

PLA-RP·AA PLA-RP·AA

PLA-RP·AA

R410A

1

PLA-RP·AA.UK
PLA-RP·AA

PEA-RP·EA PEA-RP·EA.TH-A
PEAD-RP·EA PEAD-RP·EA.UK

PEAD-RP·EA

<Outdoor unit>
[Model names] [Service Ref]

PUHZ-RP·VHA PUHZ-RP·VHA

1.UK

1.UK

PUHZ-RP·VHA-A

CONTENTS

1. PAIRING TABLE OF THE INDOOR AND OUTDOOR UNIT·····2

2. SPECIFICATIONS FOR ELECTRICAL WORK ·························3

3. WIRING DIAGRAM·····································································6

4. REFRIGERANT SYSTEM DIAGRAM ······································11

5. HOW TO CHECK THE PARTS ················································18

6. MICROPROCESSOR CONTROL·············································24

7. INDOOR UNIT CONTROL························································30

8. OUTDOOR UNIT CONTROL····················································38

9. DIP SWITCH FUNCTION ·························································54

10. FUNCTION SETTING ·······························································67

11. TEST RUN • REPLACEMENT OPERATION
& EMERGENCY OPERATION···················································77

12. SELF-DIAGNOSIS····································································83

13. TEST POINT DIAGRAM·························································109

14. TROUBLESHOOTING····························································117

15. SYSTEM CONTROL·······························································121

1

PLA-RP·AA
PLA-RP·AA

1

PLA-RP·AA.UK
PLA-RP·AA

1.UK

PEAD-RP·EA.UK
PEAD-RP·EA

1

.UK

OC293

REVISED EDITION-A

OC297

REVISED EDITION-A

—

RP3VHA RP4VHA RP5VHA RP6VHA

Indoor unit

Outdoor unit [PUHZ]

OC294

PEA–RP·EA.TH-A

OC299

REVISED EDITION-A

RP3VHA-A RP4VHA-A RP5VHA-A RP6VHA-A

Indoor unit

Outdoor unit [PUHZ]

OC300 REVISED EDITION-A

PAIRING TABLE OF THE INDOOR AND OUTDOOR UNITS

2

2

Outdoor unit
Power supply

Phase
Frequency & Voltage
Indoor unit(A)
Outdoor unit(A)

Wire No.

—

25/25

3

—

32/32

3

—

32/32

3

—

40/40

3

Models (Outdoor unit)

~ / N (Single)

50Hz, 220-230-240V

Outdoor unit
Power supply
Input capacity
Main switch/Fuse

Indoor unit/Outdoor unit connecting
Wire No. o size (e)
Remote controller-indoor unit connecting
Wire No. o size (e)

Indoor unit power supply

~ / N (Single), 50Hz, 220-230-240V

Control circuit rating

Wiring

3 o 2.5 cable (Polar)

Cable 2C o 0.69

This wire is accessory of remote controller (Wire length: 10m, Non-polar)

Indoor unit-Outdoor unit: S1-S2 AC220V-230V-240V

S2-S3 DC24V

Remote controller-Indoor unit: DC14V

RP3V RP4V RP5V RP6V

1
2

S1
S2
S3

S1
S2
S3

Indoor/outdoor
unit connection
cable

Indoor
unit

Unit
power
supply

Outdoor
unit

Remote
controller

L

N

Grounding

L
N

1
2

1
2

S1

Indoor
unit

S2
S3

S1
S2
S3

S1
S2
S3

Unit
power
supply

Indoor/outdoor
unit connection
cable

Indoor
unit

Outdoor
unit

Remote
controller

Grounding

1
2

1
2

1
2

S1
S2
S3

S1
S2
S3

S1
S2
S3

S1
S2
S3

Indoor/outdoor
connection cable

Indoor
unit

Unit
power
supply

Indoor
unit

Indoor
unit

Outdoor
unit

Remote
controller

L
N

Grounding

SPECIFICATIONS FOR ELECTRICAL WORK

2-1. Field electrical wiring(power wiring specifications)
PUHZ-RP•VHA
PUHZ-RP•VHA-A

Check items

1. Wiring size must comply with the applicable local and national code.

2. Be careful about choosing the installation location for the earth leakage breaker and how it is installed as the initial electric
current may cause it to malfunction.

3. Power supply cords and indoor unit / Outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flex­ible cord. (design 254 IEC 57)

1:1 system Synchronized twin and triple system Electrical wiring

• Synchronized twin

• Synchronized triple

3

2-2. M-NET wiring method

Group
remote
controller

Refrigerant
address 00

M-NET
address 01

A-control
remote
controller

A-control
remote
controller

A-control
remote
controller

Refrigerant
address 00

M-NET
address 02

Refrigerant
address 00

M-NET
address 03

Power
supply
unit for
transmission
wire

Central
remote
controller

M-NET transmission wire

✕ Bad example (Multi spot grounding of shield wire)

Good example 1 (Single spot grounding of shield wire)

Power
supply
appliance

M-NET type
outdoor unit

Central
remote
controller

Power
supply
appliance

M-NET type
outdoor unit

M-NET type
outdoor unit

M-NET type
outdoor unit

M-NET transmission wire

M-NET type
outdoor unit

M-NET type
outdoor unit

Central
remote
controller

Power
supply
appliance

M-NET type
outdoor unit

M-NET transmission wire

M-NET type
outdoor unit

M-NET type
outdoor unit

Good example 2 (Single spot grounding of shield wire)

(Points to notice)
(1) Outside the unit, transmission wires should stay away from electric wires in order to prevent electromagnetic noise from

making an influence on the signal communication. Place them at intervals of more than 5cm. Do not put them in the same
conduit tube.

(2) Terminal block (TB7) for transmission wires should never be connected to 220~240V power supply. If it is connected,

electronic parts on M-NET p.c. board may be burn out.

(3) Use 2-core x 1.25mm2shield wire (CVVS, CPEVS) for the transmission wire. Transmission signals may not be sent or

received normally if different types of transmission wires are put together in the same multi-conductor cable. Never do this
because this may cause a malfunction.

It would be ok if M-NET wire (non-polar, 2-cores) is arranged in addition to the wiring for A-control.

(4) Ground only one of any appliances through M-NET transmission wire (shield wire). Communication error may occur due to

the influence of electromagnetic noise.

“Ed” error will appear on the LED display of outdoor unit.
“0403” error will appear on the central-control remote controller.

If there are more than two grounding spots on the shield wire, noise may enter into the shield wire because the ground wire

and shield wire form one circuit and the electric potential difference occurs due to the impedance difference among ground­ing spots. In case of single spot grounding, noise does not enter into the shield wire because the ground wire and shield
wire do not form one circuit.

To avoid communication errors caused by noise, make sure to observe the single spot grounding method described in the

installation manual.

4

1

2

3

4

5

6

7

8

9

0

1

2

3

4

5

6

7

8

9

0

1

2

3

4

5

6

7

8

9

0

1

2

3

4

5

6

7

8

9

0

1

2

3

4

5

6

7

8

9

0

1

2

3

4

5

6

7

8

9

0

12

~

50

M-NET Address No.

<Setting example>

Switng
setting

SW11
ones
digit

SW12
tens
digit

OFF

ON

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

0

Refuigrant
address

OFF

ON

8

OFF

ON

1

OFF

ON

9

OFF

ON

10

OFF

ON

11

OFF

ON

12

OFF

ON

13

OFF

ON

14

OFF

ON

15

OFF

ON

2

OFF

ON

3

OFF

ON

4

OFF

ON

5

OFF

ON

6

OFF

ON

7

System
controller

A-control
remote
controller

Group A Group B Group C

A-control
remote
controller

TB5

A-control
remote
controller

Refrigerant
address 00

M-NET
address 01

Refrigerant
address 00

M-NET
address 02

Refrigerant
address 01

M-NET
address 03

Refrigerant
address 00

M-NET
address 04

Power
supply
unit for
transmission
wire

A-control
remote
controller

A-control
remote
controller

TB5

Group A Group B

Refrigerant
address 00

M-NET
address 01

Refrigerant
address 01

M-NET
address 02

Refrigerant
address 00

M-NET
address 04

Refrigerant
address 01

M-NET
address 03

Refrigerant
address 02

M-NET
address 05

System
controller

Power
supply
unit for
transmission
wire

● M-NET wiring

(1) Use 2-core x 1.25mm

2

shield wire for electric wires.

(Excluding the case connecting to system controller.)

(2) Connect the wire to the M-NET terminal block.Connect one core of the

transmission wire (non-polar) to Aterminal and the other to B. Peel the
shield wire, twist the shield part to a string and connect it to S terminal.

(3) In the system which several outdoor units are being connected, the terminal

(A, B, S) on M-NET terminal block should be individually wired to the other

M-NET
terminal
block

ABS

Transmission

wire

Ground
wire

Shield
part

outdoor unit’s terminal, i.e. Ato A, B to B and S to S.In this case, choose one of those outdoor units and drive a screw
to fix an ground wire on the plate as shown on the right figure.

2-2-1. M-NET address setting

In A-control models, M-NET address and refrigerant address should be set only for the outdoor unit. Similar to Free Combo
system, there is no need to set the address of outdoor unit and remote controller. To construct a central control system, the
setting of M-NET address should be conducted only upon the outdoor unit. The setting range should be 1 to 50 (the same as
that of the indoor unit in Free Combo system), and the address number should be consecutively set in a same group.

Address number can be set by using rotary switches
(SW11 for ones digit and SW12 for tens digit), which
is located on the M-NET p.c. board of outdoor unit.
(Factory setting: all addresses are set to “0”.)

2-2-2. Refrigerant address setting

In case of multiple grouping system (multiple refrigerant circuits in one group), indoor units should be connected by remote
controller wiring (TB5) and the refrigerant address needs to be set. Leave the refrigerant addresses to “00” if the group set­ting is not conducted. Set the refrigerant address by using DIP SW1-3 to -6 on the outdoor controller board. [Factory setting:
all switches are OFF. (All refrigerant addresses are “00”.)]

2-2-3. Regulations in address settings

In case of multiple grouping system, M-NET and refrigerant address settings should be done as explained in the above sec­tion. Set the lowest number in the group for the outdoor unit whose refrigerant address is “00” as its M-NET address.

w Refrigerant addresses can be overlapped if they are in the different group.

w In group B, M-NET address of the outdoor unit whose refrigerant address is “00” is not set to the minimum in the group. As

“3” is right for this situation, the setting is wrong. Taking group A as a good sample, set the minimum M-NET address in
the group for the outdoor unit whose refrigerant address is “00”.

5

3 WIRING DIAGRAM

[Servicing]
Fasten terminal of the terminal board "TB4" equips lock system.

To remove the fastened terminal, pull it while pressing the protruding portion (locking lever) of
the terminal. The fastened terminal protruding portion should face upward.

NOTES:

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, :Connector, :Terminal (block).

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

TO OUTDOOR UNIT

C

TB4

H2

5

GRILLE

MV

MV

MV

MV

5

5

5

5

TRANSMISSION
WIRES DC12V

MODELS

Manufacture

Service board

MODELS

Manufacture

Service board

SW1

BLK

BLK

BLK

BLK

BLK

BLK

BLU

BLU

TH5

12

PIPE
CN29
(BLK)

REMOCON
CN22
(BLU)

WIRELESS
CN90
(WHT)

SW1

SW2

SWE

VANE
CN6V
(WHT)

POWER
CN03
(RED)

POWER
CN2D
(WHT)

LIQUID
CN21
(WHT)

INTAKE
CN20
(RED)

D.SENSOR
CN31
(WHT)

D.HEATER
CNC (RED)

D.U.M
CNP
(BLU)

FAN
(WHT)

BRN

ORN

YLW

CONTROLLER BOARD
CN02 (WHT)

OUTDOOR UNIT
CN01 (BLU)

CN2S(WHT)

BLK

WHT

YLW

ORN

BRN

YLW

YLW

YLW

YLW

BLK

RED

WHT

CNB

W.B

LED1

LED2

BZ

RU

SW1 SW2

X4

X4

J15

J22J21 J24J23

OFF

ON

OFF

ON

4321

4321

J21J22J23J24

PLA-RP3AA
PLA-RP3AA

1

PLA-RP4AA
PLA-RP4AA

1

PLA-RP5AA

1

PLA-RP6AA
PLA-RP6AA

1

R.B

9

X1

X1

5

31

CN32

CN2LCN41

123

12315

TH1

2

TB5

1

12
TB6

CN2

TH2

DS

3
2
1

DC14V

1
2
3

12

J11

J12

J13

J14

2

121

LED1LED2LED3

ZNR

DP

3

FC

531

1

1

2

ON
OFF

J21

J22

J23

J24

C

MF

I.B

321

P.B

F1

TB4

S1
S2
S3

PLA-RP3,4,5,6AA
PLA-RP3,4,5,6AA

1

1

J11J12J13J142J15

345

ON

OFF

SW2

MODELS

Manufacture

Service board

J22J21 J24J23

OFF

ON

OFF

ON

4321

4321

J21J22J23J24

PLA-RP5AA

10

5

9

8

4

7

6321

123

CONNECTOR (PROGRAM TIMER)
TRANSMISSION LINE)

TERMINAL BLOCK (REMOTE CONTROLLER

REMOTE CONTROLLER BOARD

(0:/15kΩ, 25:/5.4kΩ DETECT)

COND./EVA. TEMPERATURE THERMISTOR

(0:/15kΩ, 25:/5.4kΩ DETECT)

PIPE TEMPERATURE THERMISTOR/LIQUID

(0:/15kΩ, 25:/5.4kΩ DETECT)

ROOM TEMPERATURE THERMISTOR

TRANSMISSION LINE)

TERMINAL BLOCK (REMOTE CONTROLLER

TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE)

CN2
TB6

R.B

TH5

TH2

TH1

TB5

TB4

DEW PREVENTION HEATERH2

W.B

SYMBOL NAME

WIRELESS REMOTE CONTROLLER BOARD
RECEIVING UNIT
BUZZER

LED (HOT ADJUST)
SWITCH (HEATING ON/OFF)

LED (RUN INDICATOR)

BZ
LED1

RU

LED2
SW1
SW2

SWITCH (COOLING ON/OFF)

SYMBOL

SYMBOL

NAME

NAME

I.B

INDOOR POWER BOARD
FUSE (4A)
VARISTOR

INDOOR CONTROLLER BOARD
CN2L
CN32
CN41
SW1
SW2
SWE
X1
X4
FC

CONNECTOR (LOSSNAY)

CONNECTOR (REMOTE SWITCH)

CONNECTOR (HA TERMINAL-A)

JUMPER WIRE (MODEL SELECTION)

JUMPER WIRE (CAPACITY CORD)

SWITCH (EMERGENCY OPERATION)

RELAY (DRAIN PUMP)

RELAY (FAN MOTOR)

FAN PHASE CONTROL

C

CAPACITOR (FAN MOTOR)

MF

FAN MOTOR

DP
DS DRAIN SENSOR

P.B

ZNR

F1

DRAIN-UP MACHINE

LED1
LED2

POWER SUPPLY (I.B)

POWER SUPPLY (I.B)

MV

VANE MOTOR

LED3

TRANSMISSION (INDOOR-OUTDOOR)

[LEGEND]

PLA-RP3AA PLA-RP4AA PLA-RP5AA PLA-RP6AA
PLA-RP3AA1 PLA-RP4AA1 PLA-RP5AA1 PLA-RP6AA1
PLA-RP3AA.UK PLA-RP4AA.UK PLA-RP5AA.UK PLA-RP6AA.UK
PLA-RP3AA1.UK PLA-RP4AA1.UK PLA-RP5AA1.UK PLA-RP6AA1.UK

6

PEA-RP3EA.TH-A PEA-RP5EA.TH-A

TO OUTDOOR UNIT

12

TB6

R.B

562341

PIPE TEMPERATURE THERMISTOR/LIQUID
(0˚C/15kΩ, 25˚C/5.4kΩ DETECT)

COND./EVA. TEMPERATURE THERMISTOR
(0˚C/15kΩ, 25˚C/5.4kΩ DETECT)

ROOM TEMPERATURE THERMISTOR
(0˚C/15kΩ, 25˚C/5.4kΩ DETECT)

TH5

TH2

TH1

CN24

NAME

SYMBOL

NAME

SYMBOL SYMBOL

NAME

CN2

R.B

CONNECTOR(PROGRAM TIMER)

REMOTE CONTROLLER BOARD

TERMINAL BLOCK(REMOTE
CONTROLLER TRANSMISSON LINE)

TB6

RELAY(FAN MOTOR)

X6

X5

X4

SWE

SW2

SW1

JUMPER WIRE(MODEL SELECTION)
JUMPER WIRE(CAPACITY CORD)
SWITCH(EMERGENCY OPERATION)
RELAY(FAN MOTOR)
RELAY(FAN MOTOR)

LED3

LED2

POWER SUPPLY(R.B)
TRANSMISSOION(INDOOR • OUTDOOR)

I.B

CN2L

CN41

CN32

LED1

INDOOR CONTROLLER BOARD
CONNECTOR(LOSSNAY)

CONNECTOR(HA TERMINAL-A)

CONNECTOR(REMOTE SWITCH))

POWER SUPPLY(I.B)

FUSE(4A)

INDOOR POWER BOARD

VARISTOR

P.B

F1
ZNR

CAPACITOR(FAN MOTOR)
FAN MOTOR

MF

TB4

TERMINAL BLOCK
(INDOOR/OUTDOOR CONNECTING LINE)

C

J21J22J23J24

J21J22J23J24

J21J22J23J24

J24J23J22

1

BLU

2

3
2
1

CN31

2
1

2
1

1

2

1
2

J24

J23

J22

P.B

ZNR

X4X5

X6 X5

X6

1357

RED

C

ORN

MF

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, :Connector, :Terminal (block).

FAN
(WHT)

1.When pressing the CHECK switch twice on the remote controller,the unit
changes to the self-diagnosis mode and will display the check code by
LED(light Emitting Diode)
Refer to the right table for the check codes and abnormarities.

LED3 LED2 LED1

INDOOR UNIT

TRANSMISSION WIRE
DC12V

OFF

ON

4321

Manufacture

<For manufacture>

SW1

[Self diagnosis]

[NOTES]

J21

OFF

ON

SWE

SW2

WIRELESS

INTAKE
CN20
(RED)

LIQUID
CN21
(WHT)

REMOCON
CN22
(BLU)

CN90
(WHT)

POWER
CN2D
(WHT)

POWER
CN03
(RED)

S3

S2

S1

F1

OUTDOOR
CN01(BLU)

3

2

1

CONT.BOARD
CN02(WHT)

CN2S(WHT)

DC14V

1

2

3

2
1

TH1

CN2

TB5

I.B

TH2

513

CN41

CN2L

CN32

X4

BLK

BLU

BRN

WHT

YLW

ORN

BRN

WHT

BLK

YLW
ORN
BRN

SW1

J11

J12

J13

J14

J15

TB4

TH5

1

2

PIPE
CN29
(BLK)

BLU

SW2

MODELS

J14J13J12J11 J15

Service board

OFF

ON

4321

OFF

ON

4321

J21

OFF

ON

4321

3EA

4EA

5EA

6EA

123 5

ON

OFF

4

<For service board>

PEA-RP4EA.TH-A PEA-RP6EA.TH-A

7

PEAD-RP3EA.UK PEAD-RP4EA.UK PEAD-RP5EA.UK PEAD-RP6EA.UK
PEAD-RP3EA1.UK PEAD-RP4EA1.UK PEAD-RP5EA1.UK PEAD-RP6EA1.UK

8

PUHZ-RP3VHA
PUHZ-RP3VHA-A

9

PUHZ-RP4VHA
PUHZ-RP5VHA
PUHZ-RP6VHA
PUHZ-RP4VHA-A
PUHZ-RP5VHA-A
PUHZ-RP6VHA-A

10

4

Measurement item

COOL: 2.3 ~ 3.0 HEAT: 2.0 ~ 3.2

0.55 ~ 1.0
50 ~ 100

-2 ~ +18

COOL: 27: HEAT: 20:

COOL: 8 ~ 20

HEAT: 30 ~ 50

COOL: 35 HEAT: 7

COOL: 40 ~ 50 HEAT: 0 ~ 5

Measurement method, remarks

Connect the pressure gauge to the high-pressure check valve.

Connect the pressure gauge to the low-pressure check valve.

Measured with piping surface thermometer.
Measured with piping surface thermometer.

Can be displayed on remote controller.

Measured with piping surface thermometer.
Measured with piping surface thermometer.

High pressure (MPa)
Low pressure (MPa)
Discharge pipe temperature (:)
Suction pipe temperature (:)
Indoor intake temperature (:)
Indoor outlet temperature (:)

Outdoor intake temperature (:)
Outdoor outlet temperature (:)

Pressure/temperature near JIS
standard operating conditions

A

B

C

D

E

F

G

H

Notes : The operation statuses vary depending on the compressor's operating frequency because units are inverter-type.

Outdoor
heat exchanger

Stop valve
(with service port)

Power
receiver

Linear
expansion
valve B Linear

expansion
valve A

4-way valve

Compressor

Ball valve

Indoor heat

exchanger

A

B

C

D

Overload operation

Standard operation

Permissible operation range
Normal operation range

0 0.2 0.4 0.6 0.8 1 1.2

Suction pressure (MPa)

Discharge pressure (MPa)

4.5
4

3.5
3

2.5
2

1.5
1

0.5
0

REFRIGERANT SYSTEM DIAGRAM

4-1. Checking operation statuses PUHZ-RP • HA

4-1-1. Measurement points and items

•The table and diagrams below show the measurement item for each measurement point, and the pressure and temperature
near the ISO T1 standard operating conditions.

•Measure the temperature and pressure of each part by following the descriptions in the table.

•Measurement time: Be sure to wait until the refrigerant circuit has stabilized (30 minutes to 1 hour) before taking
measurements.

4-1-2. Operation pressure ranges

11

4-2. Refrigerant System Diagram

Pipe temperature
thermistor/liquid
(TH2)

Distributor
with strainer
#50

Condenser/evaporator
temperature thermistor
(TH5)

Room temperature
thermistor (TH1)

Refrigerant flow in cooling
Refrigerant flow in heating

Strainer
#50

Strainer
#50

Heat exchanger

Refrigerant GAS pipe connection
(Flare)

Refrigerant LIQUID pipe connection
(Flare)

PLA-RP3AA PLA-RP4AA PLA-RP5AA PLA-RP6AA
PLA-RP3AA1 PLA-RP4AA1 PLA-RP5AA1 PLA-RP6AA1
PLA-RP3AA.UK PLA-RP4AA.UK PLA-RP5AA.UK PLA-RP6AA.UK
PLA-RP3AA1.UK PLA-RP4AA1.UK PLA-RP5AA1.UK PLA-RP6AA1.UK
PEA-RP3EA.TH-A PEA-RP4EA.TH-A PEA-RP5EA.TH-A PEA-RP6EA.TH-A
PEAD-RP3EA.UK PEAD-RP4EA.UK PEAD-RP5EA.UK PEAD-RP6EA.UK
PEAD-RP3EA1.UK PEAD-RP4EA1.UK PEAD-RP5EA1.UK PEAD-RP6EA1.UK

12

Distributor

Thermistor TH7
(Outdoor)

Heat exchanger

Refrigerant GAS pipe
connection(5/8F)

Refrigerant LIQUID pipe
connection(3/8F)

Stop valve
(with service port)

Strainer
#100

Power
receiver

Linear expansion valve B

Linear expansion valve A

Strainer
#100

Strainer
#100

Strainer
#100

Thermistor TH6
(Outdoor 2-phase pipe)

Thermistor TH3
(Outdoor pipe)

Service port
(Low pressure)

Service port
(High pressure)

High pressure
switch 63H

Bypass valve

Replace filter

Thermistor TH4
(Discharge)

Compressor

Strainer
#50

4-way valve

Capillary tube
(O.D.4.0OI.D.3.0OL200)O2pcs

Strainer
#100

Strainer
#100

Low pressure
switch 63L

Muffler

Ball valve

Restrictor
valve

PUHZ-RP3VHA

Distributor

Thermistor TH7
(Outdoor)

Heat exchanger

Refrigerant GAS pipe
connection(5/8F)

Refrigerant LIQUID pipe
connection(3/8F)

Stop valve
(with service port)

Strainer
#100

Power
receiver

Linear
expansion
valve B

Linear expansion valve A

Strainer
#100

Strainer
#100

Strainer
#100

Thermistor TH6
(Outdoor 2-phase pipe)

Thermistor TH3
(Outdoor pipe)

Service port
(Low pressure)

Service port
(High pressure)

High pressure
switch 63H

Bypass valve

Oil separator

Thermistor TH4
(Discharge)

Muffler

Strainer
#50

4-way valve

Compressor

Ball valve

Capillary tube
O.D.4.0OI.D.2.4OL500

Capillary tube
O.D.2.5OI.D.0.6OL1000

PUHZ-RP3VHA-A

PUHZ-RP4VHA PUHZ-RP5VHA PUHZ-RP6VHA
PUHZ-RP4VHA-A PUHZ-RP5VHA-A PUHZ-RP6VHA-A

13

4-3. Applicable extension pipe for each model

<Table 4>

Additional refrigerant charging amount for liquid pipe which is one size larger than

standard diameter

[12.7
[12.7

RP3

RP4 — RP6

Liquid pipe dia

Chargeless

30m
50m

100 g addition per 1 m when pipe length exceeds 20 m
100 g addition per 1 m when pipe length exceeds 20 m

20m
20m

Max. pipe length

Additional refrigerant charging amount

15

30m or

above

31 — 40m

0.6Kg

0.6kg

10m or below

41 — 50m

1.2Kg

1.2kg

51 — 60m

—

1.8kg

61 — 75m

—

2.4kg

<Table 2> Additional refrigerant charging amount for pipe of standard diameter

<Table 3>

Outdoor unit

Permitted

pipe length

Additional refrigerant charging amount for pipe

length exceeding 30 m (kg)

PUHZ-RP3

PUHZ-RP4 — RP6

Outdoor unit

PUHZ-RP3

PUHZ-RP4 — RP6

Number of

bends

Height

difference

50m or below
75m or below

Permitted

pipe length

50m or below

75m or below

3.1

5.1

11 — 20m 21 — 30m

3.3

5.3

3.5

5.5

31 — 40m

4.1

0.6

6.1

0.6

4.7

1.2

6.7

1.2

—
—

7.3

1.8

—
—

7.9

2.4

41 — 50m 51 — 60m 61 — 75m

Additional refrigerant charging amount for recharging (above) and pipe length exceeding 30m (below) (kg)

Liquid

pipe

(mm)

Gas
pipe

(mm)

[6.35

[9.52 [12.7

[9.52

OD

Thick-

ness

OD

Thick-

ness

RP3
RP4
RP5
RP6

t0.8

t0.8

[12.7

t0.8

[15.88

t1.0

[12.7

t0.8

[15.88

t1.0

[19.05

t1.0

[15.88

t1.0

[19.05

t1.0

t0.8

t0.8

: Normal piping
: It can be used, however, additional refrigerant charge is required when the pipe length exceeds 20m. Refer to table 4.
: It cannot be used.
: It can be used.
: It can be used, however, the capacity is lowered. Refer to (C) Capacity correction.

<Table 1> Pipe length for 1:1 system

*1: Set DIP SW8-1 on outdoor unit controller board to ON.
*2: The maximum length is 50 m in case of using existing pipes.
*3: The height difference between indoor and outdoor unit should be kept within 30 m for all models.

[Marks in the table above]

10m 30m 30m

50m
50m
50m

10m

50m

(*1)

75m

(*2)

50m

75m

(*2)

75m

(*2)

50m

(*1)

50m

(*1)

50m

(*1)

50m

(*1)

50m

(*1)

4-3-1. 1:1 system
(a) Pipe length

(b) Adjusting the amount of refrigerant

• Additional refrigerant charge is not necessary for the pipe length up to 30 m. When the pipe length exceeds 30 m or service

(refrigerant replacement) is performed, charge proper amount of refrigerant for each pipe length referring to table below.
Use refrigerant R410A. Use charge hose exclusive for R410A.

• When charging additional refrigerant, charge the refrigerant from low-pressure side of the port valve using a safety charger.

• Make sure that air purge for this unit at refrigerant replacement is performed from both high-pressure check valve and ser-

vice port. (If air purge is performed only from one of them, air in not purged enough.)

• When replacing refrigerant, charge the refrigerant from service port. When charged refrigerant is less than specified amount,
charge the refrigerant again from low pressure side of the port valve using a safety charger.

• Tighten the service port cap (nut) of stop valve firmly. The tightening torque is 12 to 16 N·m. (For the prevention of slow-leak)

• Check additional refrigerant charging amount referring to table 4 when liquid pipe is one size larger than standard diameter,

and table 2 when the pipe is standard diameter.

14

100

95

90

85

80

75

70

5 101520253035404550556065707580

Note: The permitted pipe length is up to 55m for RP3 model.

RP3 model

RP4 model

Heating RP3, 4, 5
and 6 models
(Up to 55m for
RP3 model)

RP5 model

RP6 model

Cooling

Capacity ratio [%]

Corrected pipe length

(c) Capacity correction

5 10152025303540455055

80

Capacity ratio [%]

Corrected pipe length

85

90

95

100

Heating RP3

Cooling RP3

Cooling
Heating

Cooling and heating capacity is lowered according to pipe length. Capacity can be obtained by referring to the capacity
curves below. When the diameter of gas pipe is one size smaller than standard diameter, cooling capacity is lowered com­paring to the standard diameter. The lowered capacity can be obtained by referring to capacity curves for gas pipe which is
one size smaller than standard size.

Corrected pipe length (m) = actual pipe length (m) + number of bends x 0.3 (m)

11

Capacity curves for PUHZ-RP • HA model <Standard size>

22

Capacity curve for PUHZ-RP3 model

<When gas pipe is one size smaller than standard size>

33

When gas pipe is one size larger than standard size for PUHZ-RP4, 5 and 6.

1 Capacity can be obtained by referring to capacity curves of standard size.

15

4-3-2. Synchronized twin and triple

(a) Pipe length

Please note that refrigerant piping length, bend number and height difference of indoor units are specified for each unit
combination.
Note: Be sure to use our Multi-distributor for distributing pipe to use existing piping.

<Table 5>

Synchronized twin

Outdoor

unit

<Table 6>

Outdoor

unit

Note 1: If total piping length exceeds charge-less piping length of 30 m, charge additional refrigerant according to the table 7.

PUHZ-RP3VHA
PUHZ-RP4~6VHA

Synchronized twin

PUHZ-RP6VHA 30 m or less70 m or less

Permitted total piping
length A + B + C

50 m or less
75 m or less

Permitted total piping
length A + B + C + D

Chargeless piping
length A + B + C

30 m or less

Charge-less piping
length A + B + C + D

Indoor unit’s height
difference [B and C]

8 m or less

Indoor unit’s height difference

[B and C] [C and D] [B and D]

8 m or less

Bend number

w 2

15 at most

Bend number

w 2

15 at most

<Table 7>

A + B + C (+D)

Outdoor unit

30 m or less
PUHZ-RP3VHA
PUHZ-RP4~6VHA

Note 2: Bends number (w 2) should be within 8 for each combination, A + B, A +C and A + D, and 15 in all.
Note 3: Height difference between indoor and outdoor unit is referred to no matter which unit is located higher or lower.

<Table 8> Pipe length for twin of RP 3 - 6 (Piping length: A + B + C)

RP3 Twin (RP1.6✕2)

Liquid [6.35

Gas [12.7
Branch pipe
diameter
[B and C]

<Table 9> Pipe length for triple of RP6 (Piping length: A + B + C + D)

Branch pipe
diameter
[B,C and D]

Liquid [6.35
Gas [12.7

Liquid [9.52
Gas [15.88

Liquid [12.7
Gas [19.05

Liquid [6.35
Gas [12.7

Liquid [9.52
Gas [15.88

Liquid [12.7
Gas [19.05

✕

✕

✕

Main pipe diameter [A]

Liquid [9.52

Gas [15.88

75 m(✽2)

50 m

✕

Not required

Liquid [9.52
Gas [15.88

50 m

50 m

Liquid [12.7
Gas [19.05

50 m(✽1)

50 m(✽1)

Additional refrigerant to be charged (kg)

31 - 40 m 41 - 50 m 51 - 60 m 61 - 75 m

0.6

RP4 Twin (RP2✕2) RP5 T win (RP2.5✕2) RP6 Twin (RP3✕2)

Liquid [9.52
Gas [15.88

75 m(✽2)

50 m

✕

✕

✕

✽1 ··· Set DIP SW8-1 on outdoor unit control circuit board to ON.
✽2 ··· When using existing piping, pipe length should be 50 m at most.
✽3 ··· Height difference between indoor and outdoor unit should be

kept within 30 m in every case.
[Marks in table]

··· Normal piping

··· It can be used with some changes of piping length and the
amount of refrigerant to be charged.
✕ ··· It cannot be used.

1.2

Main pipe diameter [A]

Liquid [12.7
Gas [19.05

50 m(✽1)

50 m(✽1)

✕

1.8 2.4

Liquid [9.52
Gas [15.88

✕

75 m(✽2)

✕

Liquid [12.7
Gas [19.05

✕

50 m(✽1)

✕

w Charge additional
refrigerant from
the check valve
connected to the
pipe of low-pressure
side in indoor unit.

Liquid [9.52
Gas [15.88

✕

75 m(✽2)

✕

Liquid [12.7
Gas [19.05

50 m(✽1)

✕

✕

16

Synchronized twin

Synchronized triple

Indoor
unit

Optional
distributing pipe

1 m or less

Multi-distributor

30 m or less

Branch
pipe B

Branch
pipe C

Main
pipe A

Indoor
unit

Outdoor
unit

Indoor
unit

Optional
distributing pipe

1 m or less

Multi-distributor

30 m or less

Branch
pipe B

Branch
pipe C

Branch
pipe D

Main
pipe A

Indoor
unit

Indoor
unit

Outdoor
unit

1. Keep Stop valve in outdoor unit fully closed (as it is shipped), and after completing refrigerant piping connection, conduct air
purge from service port of stop valve at outdoor unit.

2. After air purging, make the valve rod of stop valve at outdoor unit fully open.
Now refrigerating cycle is complete between indoor and outdoor unit.
Handle stop valve following the indication on outdoor unit.

Caution:

• Be sure to apply refrigerating oil to flare sheet face. Never apply it to screws. (As it causes flare nut loosening.)

• Use double spanner for piping connection.

• Be sure to check gas leak by using leak detector or soapy water.

• Use attached parts for refrigerant piping to provide correct insulation to the connection of indoor unit side in accordance with
attached explanation sheet.

• Be sure to provide anoxidized brazing.

(b) Adjusting the amount of refrigerant oil

(i) In case of RP 3 twin

Check the additional refrigerant oil to be charged referring to table 2 when using pipe of size referred in table 8.

(ii) In case of RP4 - 6 twin or RP6 triple

When using liquid pipe one size larger than standard diameter for main pipe A, calculate the amount of additional
refrigerant oil referring to 2 below.

1 When using piping of standard diameter or gas pipe one size larger than standard diameter for main pipe A.

Check the additional refrigerant oil to be charged referring to table 2 like 1:1 system.

2 When using liquid pipe one size larger than standard diameter for main pipe A.

[In case of RP4-6 using liquid pipe of [12.7]

• When total length of extension pipe (main pipe and branch pipe) is less than 20 m.
No adjustment is required for refrigerant oil. (Chargeless)

• When total length of extension pipe (main pipe and branch pipe) is more than 20 m.
Calculate the amount of additional refrigerant oil, referred to as W (g) in the following, using the equation below and add
proper amount of refrigerant oil. If W is less than or equal to 0, no additional charge is required. (Chargeless)

[Additional refrigerant oil] W (g) = {100(g) ✕ L1} + {60(g) ✕ L2} + {30(g) ✕ L3} - 2000(g)

Note: Put “0” in L1-3 if it is not used. L1: Liquid pipe length of [12.7 (m)

L2: Liquid pipe length of [9.52 (m)
L3: Liquid pipe length of [6.35 (m)

(c) Capacity correction

Apply pipe length between indoor and outdoor unit which is the longest of all for the calculation of capacity lowering according
to each pipe length.

17

5

Parts name Check points

Disconnect the connector then measure the resistance using a tester.
(Surrounding temperature 10:~30:)

Drain sensor

(Refer to below for a detail.)

(Refer to below for a detail.)

Room temperature
thermistor (TH1)

Pipe temperature
thermistor (TH2)

Condenser/evaporator
temperature thermistor
(TH5)

1
2
3

Normal

4.3k"~9.6k"

Abnormal

Open or short

Abnormal

Open or short

Normal

0.6k"~6.0k"

Measure the resistance between the terminals using a tester.
Measure the resistance after 3 minutes have passed since the power supply was intercepted.
(Surrounding temperature 0:~60:)

-200 20406080

< Thermistor for drain sensor >

Temperature (:)

0

1

2

3

4

5

6

7

8

9

10

Resistance (K")

HOW TO CHECK THE PARTS

5-1. INDOOR UNIT

• Common parts

<Thermistor Characteristic graph>

Thermistor for
lower temperature

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

Thermistor R0=15kΩ ±3%
Fixed number of B=3480kΩ ±2%

Rt=15exp { 3480( ) }

1

273+t

0: 15kΩ
10: 9.6kΩ
20: 6.3kΩ
25: 5.2kΩ
30: 4.3kΩ
40: 3.0kΩ

Drain sensor

1

273

< Thermistor for lower temperature >

50

40

30

20

Resistance (K")

10

0

-20 -10 0 10 20 30 40 50
Temperature (:)

Thermistor R0=6.0kΩ ±5%
Fixed number of B=3390kΩ ±2%

Rt=6exp { 3390( ) }

0: 6.0kΩ
10: 3.9kΩ
20: 2.6kΩ
25: 2.2kΩ
30: 1.8kΩ
40: 1.3kΩ

1

273+t

1

273

18

Parts name Check points

Measure the resistance between the terminals using a tester.
(Winding temperature 20:)

Fan motor (MF)

Brown

White

Blue

Red

Orange

Black

Protector
(PEA-RP3,4,5EA)
OPEN :135:
CLOSE:86i15:

(PEA-RP6EA)
OPEN :150:
CLOSE:96i15:

Abnormal

Open or short

White-Black

Black-Blue

Blue-Brown

Brown-Red

Motor terminal

or

Relay connector

Normal

PEA-

RP3EA.TH-A RP4EA.TH-A RP5EA.TH-A RP6EA.TH-A

28.6"

12.5"

4.3"

23.6"

20.6"

8.1"

3.2"

16.0"

15.3"

5.1"

2.7"

14.5"

10.2"

5.2"

3.1"

12.1"

Parts name Check points

Measure the resistance between the terminals using a tester.
(Winding temperature 20:)

Fan motor (MF)

PEAD-RP4,5,6EA

(1)

.UK

PEAD-RP3EA(1).UK

White

Blue

Red

Gray

Black

Protector
OPEN :135:
CLOSE:86i15:

Blue

WhiteRed

Gray

Black

Protector
OPEN :150:
CLOSE:96i15:

Abnormal

Open or short

Gray-Black

(White or Red open)

Blue-Black
Black-Red

(White or Red open)

Gray-Red

(White or Red open)

Motor terminal

or

Relay connector

Normal
PEAD-

RP4EA

(1).UK

RP5EA

(1)

.UK RP6EA

(1)

.UK

24.76"

4.78"

18.99"

36.63"

10.27"

2.11"

20.75"

25.44"

Abnormal

Open or short

Gray-Black

(White or Red open)

Black-Blue

(White or Red open)

Blue-Red

(White or Red open)

Motor terminal

or

Relay connector

Normal

PEAD-RP3EA

(1).UK

43.5"

14.74"

57.5"

PLA-RP3AA PLA-RP4AA PLA-RP5AA PLA-RP6AA
PLA-RP3AA

1 PLA-RP4AA1 PLA-RP5AA1 PLA-RP6AA1

PLA-RP3AA.UK PLA-RP4AA.UK PLA-RP5AA.UK PLA-RP6AA.UK
PLA-RP3AA

Parts name Check points

Vane motor

Fan motor

Relay connector

1

2

3

Protector
OPEN :130:
CLOSE:80i20:

Drain pump

Red

Red

1.UK PLA-RP4AA1.UK PLA-RP5AA1.UK PLA-RP6AA1.UK

Measure the resistance between the terminals using a tester.
(Surrounding temperature20:)

Normal Abnormal

15k" Open or short

Measure the resistance between the terminals using a tester.
(Winding temperature 20:)

Red

White

Black

1
2
3

Motor terminal

or

Relay connector

Red-Black

White-Black

PLA-RP3AA PLA-RP4,5,6AA

87.2"

104.1"

Normal

28.7"

41.6"

Abnormal

Open or short

Measure the resistance between the terminals using a tester.
(Winding temperature 20:)

1
2

Normal Abnormal

290" Open or short

PEA-RP3EA.TH-A PEA-RP4EA.TH-A PEA-RP5EA.TH-A PEA-RP6EA.TH-A

PEAD-RP3EA.UK PEAD-RP4EA.UK PEAD-RP5EA.UK PEAD-RP6EA.UK
PEAD-RP3EA1.UK PEAD-RP4EA1.UK PEAD-RP5EA1.UK PEAD-RP6EA1.UK

19

U-V

U-W

W-V

Unit

Compressor model

Winding

Resistance

( " )

ANV33FDAMT

(at 20°C)

0.266

0.266

0.266

TNB220FMBH

0.865 ~ 0.895

0.865 ~ 0.895

0.865 ~ 0.895

PUHZ-RP4,5,6VHA

PUHZ-RP3VHA

5-2. OUTDOOR UNIT

4

6

2

3

1
2
3
4
5
6

5

1

M

Blue

Brown

Yellow

Orange

Red

White

Parts name

Check points

Disconnect the connector then measure the resistance using a tester.
(Surrounding temperature 10:~30:)

Disconnect the connector then measure the resistance using a tester.
(

Winding temperature 20

:)

Thermistor (TH3)
<Outdoor pipe>

Thermistor (TH4)
<Discharge>

Thermistor (TH6)
<Outdoor 2-phase pipe>

Thermistor (TH7)
<Outdoor>

Thermistor (TH8)
<Heat sink>

Normal

160k"~410k"

4.3k"~9.6k"

39k"~105k"

TH4
TH3
TH6
TH7
TH8

Abnormal

Open or short

Normal

(1) - (6)

Red - White

(1) - (4)

Red - Orange

(2) - (5)

Brown - Yellow

(2) - (3)

Brown - Blue

Abnormal

46±4"

Measure the resistance between the terminals using a tester.
(Surrounding temperature 20

:

)

Solenoid valve coil
<Four-way valve>
(21S4)

Pin number of relay
connector is different
from that motor
connector

Motor for compressor
(MC)

Linear expansion valve
( LEV(A),LEV(B) )

Normal

Abnormal

Open or short

PUHZ-RP3VHA PUHZ-RP4, 5, 6VHA

Open or short

Measure the resistance between the terminals using a tester.
(Surrounding temperature 20

:

)

Normal

1197±10"

Abnormal

Open or short

Solenoid valve coil
<Bypass valve>
(SV)

Measure the resistance between the terminals using a tester.
(Winding temperature 20:)

Fan motor(MF1,MF2)

Normal

15.1±0.5"

2350±170" 1370±100"

PUHZ-RP3VHA PUHZ-RP4, 5, 6VHA

0.865"~0.895" 0.266"

Measure the resistance between the terminals using a tester.
(Winding temperature 20

:

)

Normal

Abnormal

Open or short

Relay connector

Abnormal

Open or short

Red — Black
Black — White
White — Red

Red

W

V
U

W

V

U

White
Black

PUHZ-RP3VHA PUHZ-RP4VHA PUHZ-RP5VHA PUHZ-RP6VHA
PUHZ-RP3VHA-A PUHZ-RP4VHA-A PUHZ-RP5VHA-A PUHZ-RP6VHA-A

5-3. COMPRESSOR TECHNICAL DATA

20

HOW TO CHECK THE COMPONENTS

0

10

20

30

40

50

-20 -10 0 10 20 30 40 50
Temperature (:)

Resistance (K")

200

150

100

50

0

25 50 75 100 125

Temperature (:)

Resistance (K")

500

400

300

200

100

0

25

50 75 100 120

Temperature (:)

Resistance (K")

<Thermistor feature chart>

Low temperature thermistors

• Thermistor <Outdoor pipe> (TH3)

• Thermistor <Outdoor 2-phase pipe> (TH6)

• Thermistor <Outdoor> (TH7)
Thermistor R0 = 15k' ±3%

B constant = 3480k' ±2%

1

R

t =15exp{3480(

0: 15k'
10: 9.6k'
20: 6.3k'
25: 5.2k'

Medium temperature thermistor

• Thermistor <Heat sink> (TH8)

1

273+t – 273

30: 4.3k'
40: 3.0k'

)}

Thermistor R50 = 17k' ±2%
B constant = 4150k' ±3%

1

t =17exp{4150(

R

1

273+t – 323

)}

0: 180k'
25: 50k'
50: 17k'
70: 8k'
90: 4k'

High temperature thermistor

• Thermistor <Discharge> (TH4)
Thermistor R120 = 7.465k' ±2%

B constant = 4057k' ±2%

1

t =7.465exp{4057(

R
20: 250k'

30: 160k'
40: 104k'
50: 70k'
60: 48k'

1

273+t – 393

70: 34k'
80: 24k'
90: 17.5k'
100: 13.0k'
110: 9.8k'

)}

21

A

B

C

Open

Extra tightning (about 32 pulse)

Pulse number

500 pulse
Opening a valve
all the way

Close

Valve position (capacity)

LEV

M

1

6

[4

[4

[3

[2

[1

2

1

Red

Brown

Blue

Orange

Yellow

White

3

4

5

6

Connector LEV-A

LEV-B

DC12V

Outdoor controller board

Drive circuit

[3

[2

[1

3

2

5

4

Linear expansion valve

1

ON
OFF
OFF
OFF

ON

ON
OFF
OFF

OFF

ON
OFF
OFF

OFF

ON
ON

OFF

[1

Output

(Phase)

Output

[2
[3

[4

234

5678

OFF
OFF

ON

OFF

OFF
OFF

ON
ON

OFF
OFF
OFF

ON

ON
OFF
OFF

ON

(1) Operation summary of the linear expansion valve.

• Linear expansion valve open/close through stepping motor after receiving the pulse signal from the outdoor controller board.

• Valve position can be changed in proportion to the number of pulse signal.
<Connection between the outdoor controller board and the linear expansion valve>

<Output pulse signal and the valve operation>

(2) Linear expansion valve operation

Opening a valve : 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8
Closing a valve : 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1

The output pulse shifts in above order.
❈ 1. When linear expansion valve operation stops, all output phase

become OFF.

❈ When the switch is turned on, 700 pulse closing valve signal will

be sent till it goes to

A point in order to define the valve position.

(The pulse signal is being sent for about 20 seconds.)
When the valve moves smoothly, there is no noise or vibration

occurring from the linear expansion valve : however, when the
pulse number moves from B to A or when the valve is locked,
more noise can be heard than normal situation.
No noise is heard when the pulse number moves from B to A in
case coil is burn out or motor is locked by open-phase.

❈ Noise can be detected by placing the ear against the screw dri-

ver handle while putting the screw driver to the linear expansion
valve.

22

(3) How to attach and detach the coil of linear expansion valve

<Composition>
Linear expansion valve is separable into the main body and the coil as shown in the diagram below.

Coil

Lead wire

<How to detach the coil>

Hold the lower part of the main body (shown as A) firmly so that
the main body does not move and detach the coil by pulling it
upward.
Be sure to detach the coil holding main body firmly. Otherwise
pipes can bend due to pressure.

Stopper

Main body

<How to attach the coil>

Hold the lower part of the main body (shown as A) firmly so that
the main body does not move and attach the coil by inserting it
downward into the main body. Then securely attach the coil stop­per to pipe B. (At this time, be careful that stress is not added to
lead wire and main body is not wound by lead wire.) If the stop­per is not firmly attached to pipe B, coil may be detached from
the main body and that can cause defective operation of linear
expansion valve.
To prevent piping stress, be sure to attach the coil holding the
main body of linear expansion valve firmly. Otherwise pipe may
break.

B

A

A

Be sure to attach the
stopper to pipe B.

23

6 MICROPROCESSOR CONTROL

Standard 1:1 Synchronized twin. Triple

1Unit (indoor/outdoor) power supply L/N
2Connecting line between the indoor and

outdoor; S1/S2/S3, Polarized 3-wire

3Remote controller transmission line; Non

polarezed 2-wire

4Auxiliary heater exclusive power supply; L/N

1Unit (indoor/outdoor) power supply L/N
2Connecting line between the indoor and outdoor; S1/S2/S3, Polarized 3-wire
3Remote controller transmission line; Non polarezed 2-wire
4Auxiliary heater exclusive power supply; L/N

1Unit (indoor/outdoor) power supply L/N
2Connecting line between the indoor and

outdoor; S1/S2/S3, Polarized 3-wire

3Remote controller transmission line; Non

polarezed 2-wire

4Auxiliary heater exclusive power supply; L/N

Remote control main/sub setting necessity
(In case of 2 remote controllers)

No setting (initial setting)
Refrigerant address setting; SW1; 3~6

Various setting

Remote controller

Main Sub

Indoor unit

Outdoor unit

Remarks

Group control

1

4

2

3

Main

(00)

Outdoor unit; (00)...Refrigerant address

(SW1; 3~6)

Indoor unit; (00)–w

Indoor unit number
(auto setting)

Refrigerant address
(receiving from the
outdoor unit)

Outdoor unit; (00)...Refrigerant address

(SW1; 3~6)

Indoor unit; (00)–w

Indoor unit number
(auto setting)

Refrigerant address
(receiving from the
outdoor unit)

(00)-1 (00)-2 (00)-3

Sub

1

44

222

4

3

Main

(00)

(00)-1 (00)-2 (01)-1

1

(01)

1

(02)

1

44

222

4

(02)-1 (02)-2

4

2

2

4

3

333

(1) Indoor unit number is set automatically
(2) When the refrigerant address of the unit is "00", Remote controller is supplied.

Remote control main/sub setting necessity
(In case of 2 remote controllers)

No setting
No setting

Remote control main/sub setting necessity
(In case of 2 remote controllers)

No setting (initial setting)
No setting (initial setting)

Various setting

Remote controller

System construction

System construction

Indoor unit

Outdoor unit

Remarks (1) Indoor unit number is set automatically

6-1. System construction

(1) System construction
A-control model which just wires the connecting line between the indoor and outdoor unit and supply the power is applicable to
any models of standard (1:1), twin and triple. (Refer to 2 Start-up system.)

24

(2) The transmitting specification for “A” control

Cross section

of cable

Round

2.5

2.5

1.5

2.5

3

3

4

4

(50)

✽2

(45)

✽3

60
✽4

Not

applicable

✽5

Flat

✽1 : Power supply cords of appliances shall not be lighter than design 245 IEC or 227 IEC.
✽2 : In case that cable with stripe of yellow and green is available.
✽3 : In case of regular polarity connection (S1-S2-S3), wire size is 1.5mm

2

.

✽4 : In case of regular polarity connection (S1-S2-S3).
✽5 : In the flat cables are connected as this picture, they can be used up to 80m.

✽6 : Mentioned cable length is just a reference value.

It may be different depending on the condition of installation, Humidity or materials, etc.

Flat

Round

Wire size

(mm

2

)

Number

of wires

Clockwise : S1-S2-S3
w Pay attention to stripe of yellow and green

Clockwise : S1-S2-S3-Open
w Connect S1 and S3 to the opposite angle

Not applicable
(Because center wire has no cover finish)

From left to right : S1-Open-S2-S3

Polarity

L(m)

✽6

(3C Flat cable ✕ 2)

S1 S2 S3

1Wiring regulations

Section Communications from remote controllers

The maximum length of

500m 80m (Including the wiring among indoor units

total wiring

The maximum numbers
for connection

One remote controller can connect and operate
up to 16 indoor units by grouping them.
One group can connect up to two remote controllers.
❋1 Remote controller considers multiplex units as

a single group.

Communications between indoor and outdoor units

in addition to the wiring between indoor and
outdoor units)

1

❋

One outdoor unit can connect up to three
indoor units.

The cables applicable 0.3mm

2

to 1.25mm

2

Use either flat-type cable (3 cores: {1.6mm or
more) or wires in the table below.
❋2 The diameter of the cables depends on

each unit.

Others The wirings as follows are not allowed:

• The wiring that the indoor units of the same

The core wire connected to terminal S2 shall be
placed at the center of flat-type cable.

refrigerant system are connected through TB5.

• The wiring which directly connects the terminals
for remote controllers.

2Transmitting specification

Section Communications from remote controllers

Communications between indoor and outdoor units
Transmitting speed 83.3 bit/sec. (1 bit = 12ms) 83.3 bit/sec. (1 bit = 12ms)
Normal transmission The terminal for remote controller transmits sig-

nals every 7.5 seconds; the indoor unit whose

Outdoor unit transmits signals every 3 seconds;
all the connected indoor units respond them.

refrigerant address is “0” responds them.
Modulation The waveform modulates at 50kHz. There is no modulation.
Detection of abnormal

communication

When transmitting error is detected for three con-

secutive minutes.

When transmitting error is detected for three
consecutive minute.

WIRING SPECIFICATIONS FOR 220~240V 50Hz
(INDOOR-OUTDOOR CONNECTING CABLE)

25

(3) The waveforms of from remote controller communications

The following graphs are the examples for measuring waveforms on the wirings of remote controlled transmission at the
terminal block for remote controller.

a) Ameasuring example in the sequence of startup b) Ameasuring example during normal stop

Transmission
from
remote
controller

Transmission
from
indoor unit

7.5
seconds

Transmission
from
remote
controller

Transmission
from
indoor unit

7.5
seconds

5V/div, 1sec/div: 5V/div, 1sec/div:

c) Expanded waveform 1 (signal 111000....) d) Expanded waveform 2 (50Hz carrier)

5V/div, 10msec/div: 5V/div, 2µsec/div:

• During normal operation, the remote controller interactively exchanges signals with the indoor unit of refrigerant address “0”.
When the remote controller cannot receive signals from the indoor unit of refrigerant address “0” for 3 minutes, it is considered
as abnormal. E0 is displayed on the remote controller as an error.

26

(4) The waveforms of communications between indoor and outdoor units

The following graphs are the examples for measuring waveforms on the wirings of connecting indoor and outdoor units at
between S2 and S3 of the outdoor terminal block TB1.

a) Ameasuring example the sequence of startup: 1 b) A measuring example in the sequence of startup: 2

Transmission
from
indoor unit

Transmission
from
outdoor unit

10V/div, 500msec/div: 10V/div, 500msec/div:

c) Ameasuring example during normal stop

(When one outdoor unit connects one indoor unit)

Transmission
from
indoor unit

Transmission
from
outdoor unit

Transmission
from
indoor unit

Transmission
from
outdoor unit

d) Ameasuring example during normal stop

(When one outdoor unit connects two indoor units)

Transmission
from
indoor unit

Transmission
from
one indoor unit

Transmission
from
another
indoor unit

10V/div, 500msec/div: 10V/div, 500msec/div:

c) Expanded waveform

10V/div, 50msec/div:

• During normal operation, outdoor unit interactively exchanges signals with all the connected indoor units.

• When outdoor unit cannot receive signals for three minutes from an indoor unit due to any trouble like cable disconnection, it
is considered as abnormal and the outdoor unit stops. E8 is displayed on the remote controller. This is to avoid independent
operation of indoor units.

27

(5) Start-up system

Power ON

YES

NO

1 Refrigerant address

transmitting

Power supply control

to remote controller

3 Set number of the

connected unit

4 Set number of the

indoor unit

6 Collecting the unit

information

7 Collecting the

operation data

Set up finish

2 Refrigerant

address "0"?

YES

NO

5 Duplication

detection

Example

2 blinking 2 blinkingNot lighted

3 seconds

A control unit is applicable to any models of standard (1:1), twin and triple without switch setting according to carrying out the
below process automatically when the power is supplied.
When the power is supplied, following processes of 1 Refrigerant address transmitting, 2 Power supply control to remote
controller, 3 Set number of the connected unit, 4 Set number of the indoor unit, 5 Duplication detection, 6 Collecting the unit
information and 7 Collecting the operation data are carried out as shown on the figure.
Also when detecting the duplicated setting in the step 5, back to the first step and reset it.

; Transmitting the switch setting

contents on the outdoor unit
remote controller
(SW1-3~6)

; Feeding control to remote

controller
Feeding the indoor unit of the
refrigerant address “0”

EA error if 4 minutes have
passed since the power is
supplied.

; If there are 2 or more speci-

fied indoor unit, back to the
first step.

<<Feature>>
A. Start-up time from the second time will be shorter since setting of the number of connected units is memorized once set.

Start-up time can be estimated as following;

•When installing ... 1~2 minutes (Depending the number of connecting units)

•Since the second time .... 20 seconds ~ 1 minute (Depending the number of connecting units)

w When the above processing does not finish, even if 4 minutes have passed, consider the processing an error and

Ea, Eb or Ec will be displayed.
However if power is not supplied to the indoor unit due to miss-wiring or looseness of the connecting lines
between the indoor and outdoor unit, there will be no display on the remote controller. Also when the data can not
be received from the outdoor unit, E6 is displayed on the remote controller after 6 minutes.

B. When replacing the p.c.board, only the unit number which has had it`s p.c.board replaced is reset.

Even if the power supply is reset, the unit number which has not had it`s replaced does not change.

C. Automatic set unit is possible to confirm by blinking the frequency of LED3 in the indoor controller board.

At intervals of approx. 3 seconds, the number of the unit-number blinks.(Example:The unit(unit number:2) blinks twice at
3-second intervals.

; Collecting the vane, louver

information and transmittance
to the remote controller.

; Collecting the preceding oper-

ation setting information and
transmittance to the remote
controller.

EB error if 4 minutes have
passed since the power is
supplied.

EC error if 4 minutes have
passed since the power is
supplied.

28

Function/control specifications

Item

Fan

Up/down
auto vane

Left/right

Function / specification

swing louver

Drain pump

Number of fan speed
Drive method

Provided
Swing function
Shutter mechanism
Moter type

Provided
Moter type

4-way ceiling cassette

PLA-RP•AA

4

Pulsation

(AC motor)

Stepping

(12V DC)

—
—

Ceiling concealed

PEA-RP•EA

2

Tap-changing

(AC motor)

—
—
—

—

—
—

—

Note: The parts marked are optional.

PEAD-RP•EA

2

Tap-changing

(AC motor)

—
—
—

—

—
—

29

7

Control modes

Control details

1-1. Thermoregulating function (Function to prevent restarting for 3 minutes)

• Room temperature ] desired temperature +1:···Compressor ON

• Room temperature [ desired temperature ···Compressor OFF
Crankcase heater: OFF when compressor operates

ON when compressor stopped

(including when thermo is OFF)
Crankcase heater switches ON when 220-240V AC current is applied between
connectors CH 1 and 2 on the outdoor control board.

1-2. Anti-freezing control
Detected condition : When the liquid pipe temperature (TH2 ) or Condenser/
Evaporator temperature (TH5 ) (w3) is 2: or less (w4) in 16

minutes from compressors start up, anti-freezing control
starts and the compressor will be suspended.

Released condition : The timer which prevents reactivating is set for 3 minutes,
and anti- freezing control is cancelled when any one of the
following conditions is satisfied.

1

Liquid pipe temperature (TH2) and Condenser / Evaporator
temperature (TH5) turn 10: or above.

2 The condition of the compressor stop has become

complete by thermoregulating, etc.

3 The operation modes became mode other than COOL.
4 The operation stopped.

1-3. Frozen protection
Detected condition : 1 When the indoor pipe temperature (TH2 ) or Condenser/

Evaporator temperature (TH5 ) continues -15: for 3 minutes
since 3 minutes has passed after the compressor start, the
compressor stops and then the mode changes to prevent
restarting for 6 minutes. After restarting of 6 minutes, when
the indoor pipe temp. (TH2) or Condenser / Evaporator
temperature (TH5) continues -15 or less for three minutes again
by the time 16 minutes have passed, the frozen protection
operates. (P6)

Detected condition : 2

In case the indoor unit continues to be under the anti-freezing
control for 9 minutes or more, the unit will be in a state of the
suspensive abnormality. Restart the compressor after releasing

the anti-freezing control. The suspensive abnormality will be
cancelled if the compressor keeps operating for 20 minutes.
However, the suspensive abnormality will turn into the
abnormality if the anti-freezing control works again for 9

minutes during that period. On the other hand, the suspensive
abnormality will be cancelled if the anti-freezing control
works for less than 9 minutes

Released condition : When the operation stops by the remote controller operation.

By the remote controller setting (switch of 4 speeds or 2 speeds)
When determining the abnormality of the pipe temp. low speed fan is fixed.

2. Fan

1. Compressor

Remarks

Type

Fan speed notch

[Low] [Mid2] [Mid1] [High]

[Low] [High]

4 speeds type
2 speeds type

Refer to w2.
Refer to w3.

w1 The thermoregulating
function is provided in the
outdoor unit.

The indoor unit transmits
the indoor room
temperature and set
temperature data to
outdoor unit, then the
outdoor unit controls
thermoregulation.

INDOOR UNIT CONTROL

7-1. COOL operation

w2 Compare liquid pipe temperature to Condenser/ Evaporator temperature, and the lower one is applied to anti-freezing control.

• Liquid pipe temperature [ Condenser/ Evaporator temperature····· Liquid pipe

• Liquid pipe temperature > Condenser/ Evaporator temperature····· Condenser/ Evaporator pipe
w3 The function of remote controller can change the temperature to start anti-freezing control.

30