Mitsubishi SEH-1.6AR.TH, SEH-2.5AR.TH, SEH-2AR.TH, SUH-1.6VR.TH, SUH-2VR.TH Service Manual

TECHNICAL & SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CONTENTS

1. PART NAMES AND FUNCTIONS ········2

2. SPECIFICATIONS·································4

3. OUTLINES AND DIMENSIONS············6

4. WIRING DIAGRAM·······························9

5.

REFRIGERANT SYSTEM DIAGRAM

······12

6. DATA ···················································16

7. MICROPROCESSOR CONTROL·······20

8. TROUBLESHOOTING························27

9. DISASSEMBLY PROCEDURE···········35

10. PARTS LIST········································42

11. OPTIONAL PARTS ·····························48

<Indoor unit>

SEH-1.6AR.TH
SEH-2AR.TH
SEH-2.5AR.TH

No. OC165

[Models]

INDOOR UNIT

The Slim Line.
From Mitsubishi Electric.

REMOTE CONTROLLER

SUH-1.6VR.TH
SUH-2VR.TH
SUH-2.5VR.TH

<Outdoor unit>

MITSUBISHI ELECTRIC

12
11
10

9
8
7
6
5
4
3
2
1

29
28
27
26
25
24
23
22
21
20
19
18

TIMER TEMP

TIMER/TEMP.

UP

DOWN

POWER

COOL

ON/OFF

MODE

SELECT

FAN

SPEED

TIMER

MODE

DRY
HEAT

HIGH

LOW

AUTO
STOP

START

g

OUTDOOR UNIT

Ceiling Concealed

Series SEH

2

1

PART NAMES AND FUNCTIONS

● Indoor Unit

SEH-1.6AR.TH
SEH-2AR.TH
SEH-2.5AR.TH

Air outlet duct flange

Air outlet

Air inlet
(Selecting the either back side or bottom side)

SUH-1.6VR.TH
SUH-2VR.TH

Air inlet

Air outlet

Drain outlet

Piping

Drain hose

SUH-2.5VR.TH

Air inlet

Air outlet

● Outdoor Unit

3

● Remote controller
SEH-1.6AR.TH

SEH-2AR.TH
SEH-2.5AR.TH

MITSUBISHI ELECTRIC

12
11
10

9
8
7
6
5
4
3
2
1

29
28
27
26
25
24
23
22
21
20
19
18

TIMER TEMP

TIMER/TEMP.

UP

DOWN

POWER

COOL

ON/OFF

MODE

SELECT

FAN

SPEED

TIMER
MODE

DRY
HEAT

HIGH

LOW

AUTO
STOP

START

g

TIMER / TEMP.

This button is used to
change between display of
room temperature and
display of remaining timer
during "AUTO STOP"
operation. Green lamps
light in selected display

Remaining timer time
display

Lamps display
remaining timer time
or room temperature.

Lamps indicate time
remaining until timer stops
timed operation. Green
lamps corresponding to
remaining number of hours
light.

Room Temperature
display

Lamps display temperature
settings and actual room
temperatures.

● Temperature settings;
Green lamps light.

● Temperature in room;
Green lamps flash.

(Example display readings are for explanations
only ; autual display readings will differ.)

This button is used to
change between low and
high fan speeds. One of
two green lamps lights to
indicate fan speed in effect.

MODE SELECT button

This button is used to
change between cooling,
heating and DRY operation
modes. One of three green
lamps lights to indicate
mode in effect.

ON / OFF button

Pushing button starts
operation. Pushing again
stops operation. Green
lamp remains lit during

UP and DOWN buttons

● Temperature control (While "TEMP" green
lamps is lit.)
Use UP and DOWN buttons to set disired
temperature between 18 and 29°C.

● Timed operation (While green "TIMER"
lamp is lit.)
Use UP and DOWN buttons to set timed
operation between one and twelve hours.

TIMER MODE button

Used for selecting timed
starting or stopping. Green
lamps lights to indicate
timer mode selected.

● Pushing UP and Down buttons together for more than two seconds will initiate "trial run" or "inspection" mode. Avoid pushing
these buttons simultaneously during normal operation. Push ON / OFF button to cancel trial run or inspection mode if initiated
by accident.

● All green lamps turn off when air conditioner is stopped.

● Avoid operation of buttons with fingernails or other sharp objects. Sharp objects may scratch operating panel.

Attention :

Settings remain in effect until changed. Air conditioner
can be operated by simply pushing ON /OFF button
once settings have been made.

FAN SPEED button

Display Panel Operating Panel

4

Model

Function

Power supply
Capacity
Dehumidification
Air flow
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current

kW

R/h

K/h

A

W

A(kW)

%

A
A
A

W

"

"

"

mm
mm
mm
mm
mm
mm

kg

kg
dB
dB

rpm
rpm

kg

R

k"
k"
k"

Capacity

Electrical
data

Coefficient of performance(C.O.P)

Compressor

Indoor
fan motor

Outdoor
fan motor

Dimensions

Indoor unit

Indoor unit

Width
Height
Depth
Width
Height
Depth

Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit

RT11(at 25:)
RT12(at 25:)
RT61(at 0:)

Sound level
(Hi)
Fan speed
(Hi)
Fan speed
regulator

Outdoor unit

Outdoor unit

Refrigerant filling capacity(R-22)

Thermistor

Weight

Special
remarks

Model
Output
Winding resistance (at 20:)
Model

Winding resistance (at 20:)

Model

Winding resistance (at 20:)

SEH-1.6AR.TH

Single phase, 220-240V, 50Hz

Cooling

SEH-2AR.TH

3.9-3.9

1.7

7.0-7.3

1460-1590

—

95-90

6.41-6.72

2.67-2.45

Heating

4.1-4.2
—

6.4-6.8

1350-1460

—

95-90

5.81-6.22

3.04-2.88

43
35

50
720-770
780-820

1.65

MS-56 O 0.52

RH-247VHAT

1200

C-R:2.13 C-S:3.91

PK6V19-EC

WHT-BLK :251.4 BLK-BLU :19.9

BLU-YLW :26.5 YLW-BRN :13.2

BRN-RED :50.0

RA6V40-EE

WHT-BLK :130.4

BLK-RED :134.6

59
39

52
810-850
810-845

1.8

MS-32(N-1) O 1.2

1100

270
700
850
605
290

35

3
1

10
10

33.18

780

Cooling

5.3-5.4

2.1

10.4-9.9

2270-2330

—

99-97

9.72-9.27

2.33-2.32

Heating

5.7-5.8
—

9.4-9.1

2050-2110

—

99-97

8.72-8.47

2.78-2.75

NH-38VMDT

1700

C-R:1.07 C-S:2.26

PK6V32-EC

WHT-BLK :161.9 BLK-BLU : 50.3

BLU-YLW :18.7 YLW-BRN :8.0

BRN-RED :39.2

RA6V50-OF

WHT-BLK :116.4

BLK-RED :111

1020

35-38 52-58

0.59-0.58 0.68-0.63

Refrigerant oil

SPECIFICATIONS

2

NOTE:Test conditions

Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB24°C

Heating : Indoor DB20°C WB

Outdoor DB 7°C WB 6°C

5

Model

NOTE:Test conditions

Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB24°C

Heating : Indoor DB20°C WB

Outdoor DB 7°C WB 6°C

Function

Power supply

Capacity

Capacity

Electrical
data

Coefficient of performance(C.O.P)

Compressor

Indoor
fan motor

Outdoor
fan motor

Dimensions

Weight

Special
remarks

Dehumidification
Air flow
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current

Model
Output
Winding resistance (at 20:)
Model

Winding resistance (at 20:)

Model

Winding resistance (at 20:)

Width

Indoor unit

Outdoor unit

Indoor unit
Outdoor unit
Sound level
(Hi)
Fan speed
(Hi)
Fan speed
regulator
Refrigerant filling capacity(R-22)

Refrigerant oil

Thermistor

Height
Depth
Width
Height
Depth

Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit

RT11(at 25:)
RT12(at 25:)
RT61(at 0:)

kW

R/h

K/h

A

W

A(kW)

%

A
A
A

W

"

"

"

mm
mm
mm
mm
mm
mm

kg

kg
dB
dB

rpm
rpm

kg

R

k"
k"
k"

SEH-2.5AR.TH

Cooling

Single phase, 220-240V, 50Hz

6.6-6.7

3.0
1200

13.5-12.6

2950-2950

—

99-97

59

12.55-11.74

0.95-0.86

2.10-2.14
NH-47VMDT

2200

C-R :0.96 C-S :2.07

PK6V50-EC

WHT-BLK :101.1 BLK-BLU :56.1

BLU-YLW :14.7 YLW-BRN :6.7

BRN-RED :28.2

RA6V85-AA

WHT-BLK :62.7 BLK-YLW :30.2

YLW-RED :62.9

1100

270
700
870
850
295

35
72
43

53
860-890
720-750

3
2

2.4

MS-32(N-1) O 1.2

10

10

33.18

Heating

6.9-7.0
—

12.3-11.8

2680-2750

—

99-97

11.35-10.94

2.57-2.55

6

OUTLINES AND DIMENSIONS

3

INDOOR UNIT

SEH-1.6AR.TH
SEH-2AR.TH
SEH-2.5AR.TH

SUH-1.6VR.TH
SUH-2VR.TH

605

29220

50

183

500

161

850

74

30

100

157

35

30

Service panel

Liquid refrigerant

pipe joint

Refrigerant pipe

(flare)

Gas refrigerant

pipe joint

Refrigerant pipe

(flare)

6.35 (SUH-1.6/2VR.TH)

12.7 (SUH-1.6VR.TH)

15.88 (SUH-2VR.TH)

Air inlet

View A

A

Electrical parts box

Suspension

bolt

pitch

Air outlet

Access door

Service space(It is
necessary to maintain
a working service
area from the ceiling.)

20 mm or more

Access door

Electrical
parts
box

Suspension bolt pitch

Suspension bolt pitch

Drain plug R1 male

Refrigerent pipe(liquid)

{6.35(SEH-1.6/2AR.TH)
{9.52(SEH-2.5AR.TH)

Refrigerent pipe(gas)

{12.7(SEH-1.6AR.TH)
{15.88(SEH-2/2.5AR.TH)

Unit : mm

OUTDOOR UNIT

35

248

Drainage
3holes 16.2

350

20

290

310

345

10cm or more

50cm

If the right/left sides or
back side is vacant,the
front has only to be 50cm
unobstructed.

or m

ore

If the front or right/left sides

are vacant, the top has only

to be 10cm

10cm or more

unobstructed.

10cm or more

35cm

or m

ore

7

SUH-2.5VR.TH

More than 350 mm

More than 10 mm

Open as a rule

More than 500 mm if the

front and both sides are open.

More than 100 mm

More than 200 mm if three

area obstacles to both sides.

Open as a rule

More than 500 mm if the

back both sides and top

are open.

OUTDOOR UNIT

Unit : mm

362
330

150

500

Service space

500

10

39.5 27.5

200

Note:Allow adequate

upper clearance

10

Front opening

10

Outdoor Unit-Necessary surrounding clearance

1715

Air intake

500

4553

Refrigerant-pipe flared

connection [15.88 5/8F

Refrigerant-pipe flared

850

Terminal block for power line

Terminal block for indoor and outdoor unit connection

870

Service panel

Handle for moving

connection [9.52 3/8F

553

352

337

403

Knock out holes for

power line 2-[27

120

60

Knock out hole

for front piping

Knock out hole

(refrigerant,drainage

and wiring)

33

104

R20

0

2

R

for right piping

(refrigerant,drainage

and wiring)

45
42

Bottom

piping hole

25 max.

Standard bolt length

80

65

Front right piping holes-

17

R6

2-U-shaped

notched

holes

detail figures

12

185 185

Air intake

200

The upper side must be open.

Air outlet

1000For 10 units or less

302

724295

Outlet guide

installation hole

Side air intake

Handle for moving

Rear fresh

air intake

441

Drain hole

2-12o23 Oval holes

(standard bolt M10)

179 524

40 60524

Drain hole

33

23

Outdoor Unit-Necessary surrounding clearance

(Concentrated installation)

100 10

Handle

for moving

95

138

Rear piping hole

8

REMOTE CONTROLLER

Remote controller cable installation

MITSUBISHI ELECTRIC

12
11
10

9
8
7
6
5
4
3
2
1

29
28
27
26
25
24
23
22
21
20
19
18

TIMER TEMP

TIMER/TEMP.

UP

DOWN

POWER

COOL

ON/OFF

MODE

SELECT

FAN

SPEED

TIMER

MODE

DRY
HEAT

HIGH

LOW

AUTO
STOP

START

75

69

108

117

108

96.5

12

90.5

11.6

3.6

33

117

33

g

Rear side wiring
arrangememt opening

Upper side wiring
arrangement
opening

Fixing hole

83.5

12

86

4.6

46

9.2

MITSUBISHI ELECTRIC

12
11
10

9
8
7
6
5
4
3
2
1

29
28
27
26
25
24
23
22
21
20
19
18

TIMER TEMP

TIMER/TEMP.

UP

DOWN

POWER

COOL

ON/OFF

MODE

SELECT

FAN

SPEED

TIMER
MODE

DRY
HEAT

HIGH

LOW

AUTO
STOP

START

Exposed remote controller
cable

Cable can be connected only to the
top of the remote controller.
(Right side, left side, and buttom are
not possible.)

g

●For exposed remote controller cable installation

Note : The cable for the remote controller has 10m (39ft) length and 12-core with connectors O.D. 5.8.

●For recessed remote controller cable installation

Unit : mm

Remote controller cable

Conduit tube
(local arrangement)

Switch box
(local arrangement)

Set screw (match with switch box),
local arrangement.

NOTE :1. Since the indoor fan motor (MF) is connected with 50 Hz power, if 60Hz power is used,change the wiring

connection showing fig:*1

Indoor Fan Motor(MF) for 60Hz

2. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

3. Use copper conductors only. (For field wiring)

4. Symbols below indicate.
/:Terminal block, : Connector

How to remove the terminals shown at ”w” mark.

9

WIRING DIAGRAM

4

TB

CIRCUIT BREAKER

POWER SUPPLY
~/N
220-240V

TB

GRN/YLW

12VDC

3

RED

L

W

W

W

W

W

N

BRN

220-240V~

N

BLU

WHT

GRN/YLW

BLU

TO OUTDOOR
UNIT
CONNECTING

P.C

CONTROLLER

REMOTE

BOARD

CN

113104

CN CN

112

52

2

RT12

1212

CNR

120

CN

120

CN

104B

RT11

TRANS

HIC1

3

CN201

ELECTRONIC CONTROL P.C BOARD

NR11

52C

F11

4

3

2
1

BLU

YLW

YLW
BLU

SR144

LDFH

BLK BLK

8

LDCOM

LDC11
LDC12

LDFL
LDFM
LDFVL

SR142

SR143

SR141

GRN/YLW

WHT
ORN
RED

BRN

BRN

WHT

7

5
6

1
2
3
4

C11

RED

BLU

ORN

MF

50Hz

2

W

SR141
SR144

RT11

TB

TERMINAL BLOCK

RT12 INDOOR COIL

THERMISTOR

HIC1

DC/DC CONVERTER

NR11

MF

52C

F11

SYMBOL

NAME NAME

C11

SYMBOL

FAN MOTOR CAPACITOR

SOLID STATE RELAY

FUSE(3.15A)

COMPRESSOR CONTACTOR

ROOM TEMPERATURE THERMISTOR

VARISTOR

FAN MOTOR

NAMESYMBOL

~

REMOTE
CONTROLLER
INTERFACE

P.C. BOARD

”w” shows the terminals with a lock mechanism,so they cannot be removed when you pull the lead wire.

Be sure to pull the wire by pushing the locking lever (project part) of the terminal with a finger.

1Slide the sleeve.
2Pull the wire while pushing the locking lever.

BLUE

YELLOW

60

50

fig: *1

BLUE

INDOOR UNIT

SEH-1.6/2/2.5AR.TH

10

OUTDOOR UNIT

SUH-1.6/2VR.TH

NOTE :1. Use copper conductors only. (For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers
(N,2,3 and ;).

3. Symbols below indicate.
/:Terminal block, : Connector

4. ”w” shows the terminals with a lock mechanism,so they cannot be removed when you pull the lead wire.

Be sure to pull the wire by pushing the locking lever (project part) of the terminal with a finger.

1Slide the sleeve.
2Pull the wire while pushing the locking lever.

12VDC

220-240V

TO INDOOR

CONNECTING

UNIT

TB

RT61

21S4

BLK

BLK

4

MF

3

W

2

W

WHT

N

W

GRN/YLW

RED

F

BLU

WHT

DSAR

WHT
ORN
RED

3
2
1

WHT

WHT

RED

BLU

A1

VLT YLW

WHT

BLU

52C1

CR

A2

L1/1 T1/2

CN730

3
2
1

W

TAB20

YLW

52C1

T3/6L3/5

52C

WW

4

3

BLU

W

C1

CN711

C65

WHT

W

RED

BLK

W

123

SR61

F61

C

MC

S

4

CN661

IC881

TRANS

R

BLK

BLK

CN721

X62

NR61

DEICER
P.C. BOARD

WHTWHT

CZ

SYMBOL NAME NAME

C1

COMPRESSOR CAPACITOR
C65
F61 FUSE (2A)

F

FUSE (2A)

MC

COMPRESSOR

<INNER THERMOSTAT>

FAN MOTOR
MF

<INNER THERMOSTAT>

NR61 VARISTOR

SYMBOL

RT61

SR61

TB
X62

21S4

52C

52C1

DEFROST THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
REVERSING VALVE RELAY
SOLENOID COIL

CONTACTOR
COMPRESSOR CONTACTOR

NAMESYMBOL

IC881 DC/DC CONVERTER
DSAR

SURGE ABSORBER 1FAN MOTOR CAPACITOR
CR SURGE ABSORBER 2
CZ SURGE ABSORBER 3

11

SUH-2.5VR.TH

RED

ORN

WHT

BLK

YLW

12VDC

TB

YLW

2
1

BLK
WHT
ORN
RED

3

4

5

6

MF

X1

BRN

SR61

X62

BLK

CN721

CN730

2
1

3

BLK

21S4

1

5

3

C2

CN711

CN661

123

RT61

4

A2

A1

ORN

WHT

YLWVLT

TB2

CR

WHT

4

52C1

F61

NR61

TRANS

IC881

220-240V~

DSAR

GRN/YLW

RED

W

W

W

W

WW

3

2

N

TO INDOOR

UNIT

CONNECTING

WHT

RED

7

RED

VLT

BLU

26F1

X1

WHT

TAB20

52C

3

YLW

DEICER
P.C. BOARD

BLU

WHTWHT

CZ

T3/6L3/5

BLU

L1/1 T1/2

52C1

WHT

C1

RED

BLK

S

C

R

MC

BLU

8

F

CZ SURGE ABSORBER 3

CR SURGE ABSORBER 2

IC881 DC/DC CONVERTERF61 FUSE (2A)

CONTACTOR

SOLENOID COIL

21S4

X62

MF

FAN MOTOR
<INNER THERMOSTAT>

MC

COMPRESSOR
<INNER THERMOSTAT>

TB,TB2

SR61

RT61

NR61 VARISTOR

F

C2

SYMBOL NAME NAME

C1

DSAR

SYMBOL

COMPRESSOR CAPACITOR

SURGE ABSORBER 1

FAN MOTOR CAPACITOR

FUSE (2A)

TERMINAL BLOCK

52C1

THERMAL REED SWITCH

26F1

X1 FAN MOTOR RELAY

52C

COMPRESSOR CONTACTOR

REVERSING VALVE RELAY

SOLID STATE RELAY

DEFROST THERMISTOR

NAMESYMBOL

NOTE :1. Use copper conductors only. (For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers
(N,2,3 and ;).

3. Symbols below indicate.
/:Terminal block, : Connector

4. ”w” shows the terminals with a lock mechanism,so they cannot be removed when you pull the lead wire.
Be sure to pull the wire by pushing the locking lever (project part) of the terminal with a finger.

1Slide the sleeve.
2Pull the wire while pushing the locking lever.

OUTDOOR UNIT

12

5

REFRIGERANT SYSTEM DIAGRAM

Indoor
heat
exchanger

Outdoor
heat
exchanger

Distributor
(With strainer)

Flared connection

Room temperature
thermistor
RT11

Indoor coil
thermistor
RT12

Defrost
thermistor
RT61

Flared connection

Stop valve

Stop valve
(with service port)

Strainer

Strainer

Strainer

Capillary tube
({3.0x{1.8xR330)

Capillary

tube

({3.0x{1.6xR550)

Restrictor valve

Refrigerant flow in cooling

Compressor

Accumulator

Strainer 1

valve

Muffler

Refrigerant flow in heating

Refrigerant pipe [12.7
(Option)
(with heat insulator)

Refrigerant pipe
(Option) [6.35
(with heat insulator)

Dis
Pressure
Regulator

Reversing

INDOOR UNIT

SEH-1.6AR.TH

OUTDOOR UNIT

SUH-1.6VR.TH

Indoor
heat
exchanger

Outdoor
heat
exchanger

Distributor
(With strainer)

Flared connection

Room temperature
thermistor
RT11

Indoor coil
thermistor
RT12

Defrost
thermistor
RT61

Flared connection

Stop valve

Stop valve
(with service port)

Strainer

Capillary tube
({4.0X{2.4XR660)

Capillary

tube

({3.0X{1.6XR860)X2

Restrictor valve

Refrigerant flow in cooling

Compressor

Accumulator

Strainer 1

valve

Muffler

Refrigerant flow in heating

Refrigerant pipe [15.88
(Option)
(with heat insulator)

Refrigerant pipe
(Option) [6.35
(with heat insulator)

Dis
Pressure
Regulator

Strainer

Strainer

Reversing

INDOOR UNIT

SEH-2AR.TH

OUTDOOR UNIT

SUH-2VR.TH

13

INDOOR UNIT OUTDOOR UNIT

SEH-2.5AR.TH

SUH-2.5VR.TH

Indoor
heat
exchanger

Indoor coil
thermistor
RT12

Room temperature
thermistor
RT11

Strainer

Distributor
(With strainer)

Strainer

Refrigerant pipe [15.88
(Option)
(with heat insulator)

Ball valve

Flared connection

Flared connection

Refrigerant pipe
(Option) [9.52
(with heat insulator)

Muffler

Accumulator

Strainer 3

Ball valve
(with service port)

Reversing
valve

Compressor

Strainer 2

Dis
Pressure
Regulator

Distributor

Capillary tube
({4.0x{2.0xR410)

Refrigerant flow in cooling
Refrigerant flow in heating

Outdoor
heat
exchanger

Defrost
thermistor
RT61

14

Models

A: Refrigerant piping
Max.length
15m(49ft)

Max. Height difference *

7m(23ft)

MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE

SEH-1.6AR.TH
SEH-2AR.TH
SEH-2.5AR.TH

Length : m(ft)

A

15(49)

Piping size O.D. : mm (in.)

Gas

Liquid

{12.7(1/2)

{6.35(1/4)

{15.88(5/8)

wIt does not matter which unit is higher.

Models

SEH-1.6AR.TH
SEH-2AR.TH
SEH-2.5AR.TH

Outdoor unit:precharged

(up to 7m)

1,650
1,800

Refrigerant piping length (one way)

7m08m509m

100

10m

150

11m

200

12m

250

13m

300

14m

350

15m

400

Calculation : (SEH-1.6/2AR)og=50g/mo(Refrigerant piping length minus 7m)

(SEH-2.5AR)og=65g/mo(Refrigerant piping length minus 7m)

If pipe length exceeds 7m, additional refrigerant (Freon 22) charge is required

ADDITIONAL REFRIGERANT CHARGE (R-22 : g)

{9.52(3/8)

2,400

65

130

195 260

325

390 455 520

15

EVACUATION PROCEDURES

Connect the refrigerant pipes (both the liquid and gas
pipes) between the indoor and the outdoor units.

Remove the service port cap of the stop/ball valve on the gas pipe side of the outdoor unit gas pipe.
(The stop/ball valve will not work in its initial state fresh out of the factory (totally closed with cap on).)

Connect the gauge manifold valve and the vacuum pump to the service
port of the stop/ball valve of the outdoor unit. : For SUH-1.6/2VR.TH connect to gas pipe side.

For SUH-2.5VR.TH connect to liquid pipe side.

Run the vacuum pump for more than 15 minutes and at this time confirm that the pressure gauge indicates

-0.1 Mpa (-76 cmHg).

Check the vacuum with the gauge manifold valve, then close the gauge manifold valve, and stop the
vacuum pump.

Leave as it is for one or two minutes. Make sure the pointer of the gauge manifold valve remains in the
same position.

After refrigerant pipes are connected and evacuated, fully open all stop/ball
valves on gas and liquid pipe sides.
Operating without fully opening lowers the performance and causes trouble.

Pipe length :
7m maximum
No gas charge is
needed.

Pipe length
exceeding 7m
Charge the prescribed
amount of gas.

Remove the gauge manifold valve quickly from the service port of the stop/ball valve.

Tighten the cap to the service port to obtain the initial status.

Tighten the cap to the stop/ball valve.

Leak test

Ball valve
(liquid side)

Service port

Valve knob Lo

Valve knob Hi

Charge hose

Vacuum

pump

Manifold
valve

Compound gauge Pressure gauge

-1.01✕10 Pa
(-760mmHg)

Stop valve

Stop valve

Stop valve

Close

Caps

Gauge manifold valve

Gas pipe

Connection
pipe

Open

Vacuum pump

Service port

Hexagonal
wrench

Liquid pipe

Hexagonal
wrench

<SUH-2.5VR.TH>

<SUH-1.6/2VR.TH>

16

DATA

6

The standard data contained in these specifications apply only to the operation of the air conditioner under normal condition.

Operating conditions vary according to the areas where these units are installed. The following information has been provided to
clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

Rated voltage : ±10% (198~264V), 50Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

COOLING
(1) Indoor intake air wet-bulb temperature :

˚CWB

(2) Indoor outlet air wet-bulb temperature :

˚CWB

(3) Outdoor intake air dry-bulb temperature :

˚CDB

(4) Total input : W

Indoor air wet/dry-bulb temperature difference on the side of the chart on page shows the difference between the
indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

How to measure the indoor air wet-bulb/dry-bulb temperature difference

1. Attach at least 2 sets of wet-and-dry-bulb thermometers to the indoor air inlet as shown in the figure, and at least 2 sets of wet­and-dry-bulb termometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.

2. Attach at least 2 sets of wet-and-dry-bulb thermometers to the outdoor air inlet.

Cover the thermometers to prevent direct rays of the sun.

3. Check that the air filter is cleaned.

4. Open windows and doors of the room.

5. Press the TEST RUN switch once to start the COOL(HEAT) MODE.

6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.

7. 10 minutes later, measure temperature again and check that the temperature does not change.

Air outlet

Air inlet

Wet-and dry-bulb
thermometers

Wet-and dry-bulb
thermometers

BACK VIEW

INDOOR UNIT

OUTDOOR UNIT

HEATING
(1) Indoor intake air dry-bulb temperature :

˚CDB

(2) Indoor outlet air dry-bulb temperature :

˚CDB

(3) Outdoor intake air wet-bulb temperature :

˚CWB

(4) Total input : W

20.6

19.0

17.5

15.9

14.3

12.7

11. 1

8.7

8.0

7.3

6.6

5.9

5.3

9.5

9.4

10.0

8.6

7.8

7.1

6.3

5.6

SEH-2AR.TH

SEH-1.6AR.TH

22.3

22.9

20.6

21.1

18.9

19.4

17.2

17.6

15.4

15.8

13.7

14.1

12.0

12.3

10.3

10.6

9.1

8.3

7.5

6.7

6.0

SEH-2.5AR.TH

SEH-2AR.TH

EH-1.6AR.TH

EH-2.5AR.TH

17

Dry Bulb temperature (˚C)

20
25
30

Relative humidity (%)

50
60
70

(4) OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

COOL operation

1 Both indoor and outdoor units are under the same temperature/humidity condition.

2 Air flow should be set at MAX.

0.8

0.7

0.6

0.5

0.4

0.3
15 18 20 25 30 32 35(:)

50 60 70 (%)

Ambient temperature (:) / Ambient humidity (%)

Outdoor low pressure

8

7

6

5

4

3

15 18 20 25 30 32 35(:)

50 60 70 (%)

Ambient temperature (:) / Ambient humidity (%)

Outdoor unit current (A)

240V

220V

8

7

5

6

4

3

(MPa•G)

(kgf/F• G)

SEH-1.6AR.TH

3 The unit of pressure has been changed to MPa based on the international system of units(SI unit system).

The converted score against the traditional unit system can be gotten according to the formula below.

1(MPa • G) =10.2(kgf/

f

f

• G)

0.7

0.6

0.5

0.4

0.3

0.2
15 18 20 25 30 32 35(:)

50 60 70 (%)

Ambient temperature (:) / Ambient humidity (%)

Outdoor low pressure

10

9

8

7

6

5

15 18 20 25 30 32 35(:)

50 60 70 (%)

Ambient temperature (:) / Ambient humidity (%)

Outdoor unit current (A)

240V

220V

(MPa•G)

7

6

4

3

2

5

(kgf/F• G)

SEH-2AR.TH

SEH-2.5AR.TH

240V

220V

0.7

0.6

0.5

0.4

0.3

0.2
15 18 20 25 30 32 35(:)

50 60 70 (%)

Ambient temperature (:) / Ambient humidity (%)

Outdoor low pressure

13

12

11

10

9

8

7

15 18 20 25 30 32 35(:)

50 60 70 (%)

Ambient temperature (:) / Ambient humidity (%)

Outdoor unit current (A)

(MPa•G)

7

6

4

3

2

5

(kgf/F• G)

18

10

9

8

7

0 2 5 10 15 20 25(:)

Ambient temperature (:)

Outdoor unit current (A)

240V

220V

240V

220V

13

11

9

7

0 2 5 10 15 20 25(:)

Ambient temperature (:)

Outdoor unit current (A)

SEH-2AR.TH

SEH-2.5AR.TH

8

7

6

5

4

3

0 2 5 10 15 20 25(:)

Ambient temperature (:)

Outdoor unit current (A)

HEAT operation

Condition Indoor : Dry bulb temerature 20.0:

Wet bulb temerature 14.5:

Outdoor : Dry bulb temerature 7,15,20:

Wet bulb temerature 6,12,14.5:

240V
220V

SEH-1.6AR.TH

19

(5) INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW

SEH-1.6AR.TH

80

60

40

20

External static pressure(Pa)

(1Pa = 0.1mmAq)

0

Fan Performance

Recommended range

105 7 15 20 25

Air flow (K/X)

1.1

1.0

0.9

Correction factor

0.8

1.3

1.2

1.1

1.0

Correction factor

0.9

Corrected Air flow

Cooling

1051520

Air flow (K/X)

Heating

Capacity
Input

25

SEH-2AR.TH

80

60

40

20

External static pressure(Pa)

(1Pa = 0.1mmAq)

0

SEH-2.5AR.TH

80

60

Fan Performance

Recommended range

15510 2025

Air flow (K/X)

Fan Performance

Recommended range

0.8

Corrected Airflow

1.1

1.0

0.9

Correction factor

0.8

1.2

1.1

1.0

0.9

Correction factor

0.8

Corrected Air flow

1.1

1.0

0.9

Correction factor

0.8

5101520

Air flow (K/X)

Cooling

510152025

Air flow (K/X)

Heating

510152025

Air flow (K/X)

Cooling

10 15 20 25 30

Air flow (K/X)

25

Capacity
Input

Capacity
Input

40

20

External static pressure(Pa)

(1Pa = 0.1mmAq)

0

15510 2025

Air flow (K/X)

1.3

1.2

1.1

1.0

Correction factor

0.9

Heating

10 15 20 25 30

Air flow (K/X)

20

MICROPROCESSOR CONTROL

7

1. COOL operation

(1) Compressor control

1 3-minute time delay

To prevent overload, the compressor will not start within 3 minutes after stop.

2 The compressor runs when the room temperature is higher than the set temperature.

The compressor stops when the room temperature is equal to or lower than the set temperature.

3 The compressor stops in check mode.

(2) Indoor fan control

Indoor fan speed LOW/HIGH depends on the remote controller setting.

(3) Outdoor fan control

POWER ON/OFF with the compressor.

(4) Coil frost prevention

1 Temperature control

When the indoor coil thermistor RT12 reads -1°C or below, the coil frost prevention mode starts immediately.
However the coil frost prevention will not work for 5 minutes after the compressor starts.
During the coil frost prevention compressor stops and the indoor fan operates at the set speed for 5 minutes.
After that, if RT12 still reads or below -1°C, this mode prolonged untill theRT12 reads over -1°C.
After the coil frost prevention stops, units will not enter this mode again at least 5 minutes even RT12 reads -1°C.

2 Time control

When the three conditions below have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes.
a. Compressor has been continuously operating.
b. Indoor fan speed is Low.
c. Room temperature is below 26°C.
When compressor stops ,the accumulated time is canceled and when compressor restarts, time counting starts from
the beginning.
Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds 26°C.
However, when two of the above conditions (b.And c.) are satisfied again time accumulation is resumed.

<How to operate>

1 Press POWER ON / OFF button.
2 Press MODE SELECT button to set operation mode to COOL.
3 Check lamp is ON and set desired temperature with UP or DOWN but-

ton.

NOTES : 1. When lamp is ON, press TIMER/TEMP button to change the

display to temperature mode.

2. Set temperature changes by 1°C in the range 18 ~ 29°C each time UP
or DOWN button is pressed.

3. The lighting lamp shows the set temperature, and the flashing lamp
shows the room temperature.
When the room temperature is equal to the set temperature, the lamp
keeps lighting, 0.5 seconds brightly and 0.5 seconds faintly.

TIMER

<COOL operation time chart>

W1 Even if the room temperature rise above the set temperature during this period, the compressor will not start until this

period has ended.

MITSUBISHI ELECTRIC

12
11
10

9
8
7
6
5
4
3
2
1

29
28
27
26
25
24
23
22
21
20
19
18

TIMER TEMP

TIMER/TEMP.

UP

DOWN

POWER

COOL

ON/OFF

MODE

SELECT

FAN

SPEED

TIMER

MODE

DRY
HEAT

HIGH

LOW

AUTO

STOP

START

g

TEMP

Thermostat

Indoor fan

Operation starts by
POWER button
ON.

ON

OFF

ON

OFF

Room temperature
becomes equal to
set temperature.

Room temperature
rises above set
temperature.

LOW or HIGHLOW or HIGH

Operation stops by
POWER button
OFF.

Compressor
Outdoor fan

ON

OFF

}

MIN. 3 minutes 1

21

2. DRY operation

<How to operate>

1 Press POWER ON / OFF button.
2 Press MODE SELECT button to set operation mode to DRY.
3 Check lamp is ON and set desired temperature with UP or DOWN but-

ton.

NOTES : 1. When lamp is ON, press TIMER/TEMP button to change the

display to temperature mode.

2. Unable to set temperature. POWER ON/OFF are operated by
microprocessor control automatically.

3. The flashing lamp shows the room temperature.

TIMER

<DRY operation time chart> In case of the room temperature of 23: and above.

Thermostat

Indoor fan

Outdoor fan
compressor

1st ON

8min.

1min

.

4min.

3min.

ON

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

ON

ON

ON

ON

ON

(1) Setting temperature

Follow the right chart with according to the initial room temperature. When
the room temperature is 13: or under, dry operation does not work.

(2) ON/OFF control

When the room temperature is 23°C or over:

Compressor operates by temperature control and time control.

1 Set temperature is controlled to fall 2°C above from initial set temperature.
2 When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF.

When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.
Indoor fan and outdoor fan operate in the same cycle as the compressor.

When the room temperature is under 23°C.

When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.

(3) Coil frost prevention

The operation is same as that of coil frost prevention during COOL mode.
However the indoor fan speed becomes the set speed or Low.

TIMER TEMP

12
11
10

9
8
7
6
5
4
3
2
1

29
28
27
26
25
24
23
22
21
20
19
18

TIMER/TEMP.

UP

DOWN

POWER

ON/OFF

COOL

MODE

DRY

SELECT

HEAT

g

HIGH

FAN

SPEED

LOW

AUTO
STOP

TIMER
MODE

START

MITSUBISHI ELECTRIC

TEMP

22

3. HEAT operation

<How to operate>

1 Press POWER ON / OFF button.
2 Press MODE SELECT button to set operation mode to HEAT.
3 Check lamp is ON and set desired temperature with UP or DOWN but-

ton.

NOTES : 1. When lamp is ON, press TIMER/TEMP button to change the

display to temperature mode.

2. Set temperature changes by 1°C in the range 18 ~ 29°C each time UP
or DOWN button is pressed.

3. The lighting lamp shows the set temperature, and the flashing lamp
shows the room temperature.
When the room temperature is equal to the set temperature, the lamp
keeps lighting, 0.5 seconds brightly and 0.5 seconds faintly.

TIMER

(1) Compressor control

1 3minute time delay

To prevent overload, the compressor will not start within 3minutes after stop.

2 The compressor runs when the room temperature is higher than the set temperature.

The compressor stops when the room temperature is equal to or higher than the set temperature.

w 4degrees up control

During heat operation, lower the room temperature for 4degrees more than thermistor value.

3 The compressor stops in check mode.
4 Follow the item (5) during defrosting.

<HEAT operation time chart>

Minimum 3 minutes w1

ON

Thermostat

Indoor fan

Compressor
Outdoor fan

ON

LOW or HIGHLOW LOW LOW or HIGH VLo

OFF

OFF

ON
OFF

Operation starts by
POWER button
ON.

Operation stops by
POWER button
OFF.

Room temperature
becomes equal to
set temperature.

Room temperature
falls below set tem­perature.

}

w1 Even if the room temperature falls below the set temperature during this period, the compressor will not start until this period has ended.

TIMER TEMP

TIMER/TEMP.

29

12

28

11

27

10

26

9

25

8

24

7

23

6

DOWN

22

5

21

4

20

3

19

2

18

1

POWER

ON/OFF

COOL

MODE

DRY

SELECT

HEAT

UP

g

HIGH

FAN

SPEED

LOW

AUTO
STOP

TIMER
MODE

START

MITSUBISHI ELECTRIC

TEMP

23

(2) Indoor fan control

1 Cold air prevention control

The fan runs at set speed when the indoor coil thermistor RT12 temperature exceeds 22°C. The fan operates at VLo
when the temperature is below 18°C. But the fan stops when the indoor fan operates at VLo and the room temperature
is 15°C or less. Released

Cold Air Prevention

NOTE : At initial in hysteresis this control works.

2 New warm air control.

When compressor starts in heating operation or after defrosting, the fan changes the speed with dependance on the
indoor coil thermistor RT12 temperature to blow out warm air.
After releasing of cold air prevention, when the indoor coil temperature is 37°C or above, the fan speed shifts to the set
speed, and when the fan speed is changed by the remote controller, the fan speed is the set speed.
When the indoor coil temperature is less than 37°C, the fan speed is controlled by time as below.

<Time condition> <Indoor fan speed>
less than 2 minutes························Low
2 minutes or more··························High

The upper limit of the fan speed is the set speed.

If the thermostat turns off, this operation changes to flow soft control.

3 Flow soft control

After the thermostat turns off, the indoor fan operates at VLo.

NOTE : When the thermostat turns on, the fan operates at the set speed. Due to the cold air prevention control, the fan

does not start until the indoor coil thermistor RT12 reads 22°C or more.

4 Follow the item (5) during defrosting.

(3) Outdoor fan control

POWER ON/OFF with the compressor. However during defrosting, follow the item (5).

(4) Reversing valve

18°C

22°C

Heating · · · · · ON
Cooling · · · · · OFF
Dry · · · · · · · · OFF

NOTE: The Reversing valve reverses for 5 seconds right before start-up of the compressor.

ON

OFF

ON

OFF

ON
OFF

Compressor

Reversing valve

Outdoor fan

(COOL / DRY)

(HEAT)

5 sec.

5 sec.

24

(5) Defrosting

Defrosting of outdoor heat exchanger is controlled by deicer P.C. board, with detection by the defrost thermistor RT61.

1Defrost starting conditions

When all conditions of a),b) are satisfied, the defrosting operation starts.

a) Under the heat operation, the compressor cumulative operation time exceeds 40 minutes without the detrosting

operation working.

b) The defrost thermistor RT61 reads - 3°C or less.

2Defrost terminating conditions

When the condition d) or e) is satisfied, the defrosting operation stops.

d) The defrost thermistor RT61 reads 3.1°C or more.
e) The defrosting time exceeds 10 minutes.

NOTE w When the indoor coil thermistor reads above 18°C, indoor fan operates at VLo for 30 seconds.

w When the indoor coil thermistor reads 18°C or less, the indoor fan stops.

<Defrosting time chart>

Defrost thermistor

3.1: or more

-3: or less

Outdoor 52C relay
(Compressor)

X62

(Reversing valve)

SR61
Outdoor fan

Defrost
counter

Indoor fan

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

Max 10 min.

30 sec.

15 sec.

30 sec.

15 sec.

VLo

w

RT61

25

4. TIMER operation

<Timer function>

AUTO STOP ·········Air conditioner stops after the set time lapses.
AUTO START ········Air conditioner starts after the set time lapses.

<How to operate

●

AUTO STOP timer>

1 While lamp is lighting, press TIMER MODE button.

and lamps turn ON.

2 Set the time for the AUTO STOP timer with the UP or DOWN button.

NOTE : The time setting is in 1 hour units up to 12 hours.

3 With the lapse of time, the timer lamps turn OFF one by one, showing the

remaining time.

4 To cancel the AUTO STOP timer and continue operation, press the TIMER MODE

button.
To cancel the AUTO STOP timer and stop operation, press the POWER ON/OFF
button.

<How to operate AUTO START timer>

1 While lamp is OFF, press TIMER MODE button.

and lamps turn ON.

2 Set the time for the AUTO START timer with the UP or DOWN button.

NOTE : The time setting is in 1 hour units up to 12 hours.

3 With the lapse of time, the timer lamps turn OFF one by one, showing the

remaining time.

4 To cancel the AUTO START timer and keep the unit OFF, press the TIMER MODE

button.
To cancel the AUTO START timer and start operation, press the POWER ON /
OFF button.

TIMER

POWER

● POWER

5. TEST RUN

The unit starts the test run by pressing both the UP and DOWN buttons simultaneously for more than two seconds during

lamp ON or the unit OFF.

● The test run automatically stops in 2 hours.

● Set temperature is not displayed during test run.

●

During the test run, the thermo function are as below.

● Room temperature is displayed by the flashing green lamp when TIME/TEMP button is pressed.

● The test run can be released by pressing the POWER ON / OFF or the TIMER MODE button.

TIMER

Initial 30 minutes

Thermo ON at the all time

Since 30 minutes passed to terminating of the

test run

Thermo ON/OFF as 24: of setting

temperature

TIMER TEMP

TIMER/TEMP.

29

12

28

11

27

10

26

9

25

8

24

7

23

6

22

5

21

4

20

3

19

2

18

1

UP

DOWN

POWER

COOL
DRY
HEAT

HIGH

LOW

AUTO

STOP

START

MITSUBISHI ELECTRIC

ON/OFF

MODE

SELECT

g

FAN

SPEED

TIMER

TIMER
MODE

26

6. SERVICE FUNCTION

(1) AUTO RESTART FUNCTION

Operating the J2 Jumper line on the remote control Interface P.C.board of the indoor unit.
The function can set the auto restart function.

J2 = Auto restart wAuto restart setting on the shipping.
No J2 = No auto restart

(2) COMPULSORY DEFROSTING MODE FOR SERVICE

By short circuit of the connector JP607 and R853 on the outdoor deicer P.C. board, defrosting mode can be accomplished
regardless of the defrost interval restriction.
Defrost thermistor RT61 must be below -3:.

(3) DEFROST TERMINATION CHANGE

<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed.(See page 33.)
<JPE> when the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed.(See page 33.)

(4) 4degrees up Function

Operating the J3 Jumper line on the remote control Interface P.C.board of the indoor unit.
The function can set the 4degrees up function.(See page 32.) W 4degrees setting on the shipping.

J3 = 4degrees up
NoJ3 = No 4degrees up

Model

Jumper wire Change point

JPC

JPE

Defrost interval time changes from 40 minutes to 15minutes.

Defrost start temperature changes from

-3: to 0:.

Defrost finish temperature changes from

3.1: to 10.1:.

SEH-1.6AR.TH
SEH-2AR.TH
SEH-2.5AR.TH

27

TROUBLESHOOTING

8

1. Cautions on troubleshooting

(1) Before troubleshooting, check the followings:

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

(2) Take care the followings during servicing.

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

off the breaker.

2 When removing the electronic control P.C. 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.

28

2. Self diagnostic function

(1) When trouble occurs during operation, the unit stops and enters the self-diagnotic mode, and displays the trouble

location with the timer lamps on the remote controller. All the other lamps are OFF.

(2) To activate the self-diagnostic function for service, press the UP and DOWN buttons simultaneously for more than two

seconds during operation with lamp ON.

(3) The timer lamps show the latest trouble. Trouble data is memorised unit the next trouble occurs, even when the breaker

turns OFF. To clear the memory, press the UP and DOWN buttons simultaneously for more than two seconds during

the test run.
(4) All buttons except the POWER ON/OFF button are unavailable during the self-diagnostic mode.
(5) To release the self-diagnostic mode, press the POWER ON/OFF button.

TEMP.

12

11

10

9

8

7

6

5

1

2

3

4

(Indicates that the unit is in self-diagnostic mode)

TIMER TEMP.

29 Remote controller interface signal error

28 Mis-wiring or indoor-outdoor signal error

27 Indoor thermistor abnormally

26 Outdoor thermistor abnormally

25

24

23

22

18

19

20

21

29

3. Trouble shooting

(1) In case of being indicated irregularity on the self diagnoses

No Phenomenon Cause Countermeasure

29 Remote controller interface

signal error

Mis-wiring of the Interface
P.C.board.

Reinsert the wiring connector of the Interface
P.C.board.

Trouble of the Interface P.C.board.

Exchange the Interface P.C.board.

Trouble of the Indoor P.C.board. Exchange the Indoor P.C.board.

28

Mis-wiring

Wiring between the indoor and
outdoor is coming off.

Check the wiring out between the indoor and
outdoor.

Difference of wiring polarity
between the indoor and outdoor.

Indoor-outdoor
signal error

Trouble of the outdoor deicer
P.C.board.

Check the deicer P.C.board out.

Trouble of the Indoor P.C.board.

Exchange the Indoor P.C.board.

27

Indoor coil thermistor Mis-connecting of the Indoor coil

thermistor.

Reinsert the connector (CN112).

Trouble of the Indoor coil
thermistor.

Room temperature
thermistor

Trouble of the Indoor P.C.board.

Check the resistance value of the thermistor.

Mis-connecting of the room
temperature thermistor.

Exchange the Indoor P.C.board.

Reinsert the connector (CN113).

Trouble of the room temperature
thermistor.

Trouble of the Indoor P.C.board.

Exchange the Indoor P.C.board.

Check the resistance value of the thermistor.

26 Outdoor thermistor

Mis-connecting of the Outdoor
thermistor.

Reinsert the connector (CN661).

Trouble of the Outdoor thermistor.

Trouble of the deicer P.C.board.

Check the resistance value of the thermistor.

Exchange the deicer P.C.board.

30

(2) Other case

Phenomenon Cause Countermeasure

Not working of remote
controller switch ON/OFF

Mis-connecting the remote control wiring. Reinsert the connector of remote control wiring.

Mis-connecting the Interface P.C.board.

Reinsert the wiring connector of Indoor P.C.board
and Interface P.C.board.

Short circuit the protecting parts in the
Indoor P.C.board.

Check the varistor(NR11) and fuse(F11) out in the
Indoor P.C.board.

Trouble of the Interface P.C.board.

Check the Interface P.C.board out.

Trouble of the Indoor P.C.board.

Working the Indoor units and
not working the outdoor
units.

Trouble of the remote controller. Exchange the remote controller.

Wiring between the indoor and outdoor is
coming off.

Check the wiring out between the indoor and
outdoor.

Difference of wiring polarity between the
indoor and outdoor.

Check the deicer P.C.board out.

Trouble of the deicer P.C.board.

Not rotating the fan in the
indoor unit.

Trouble of the contactor(52C1).

Trouble of the compressor(MC) and
outdoor fan motor(MF).

Exchange the contactor.

Check the compressor and fan motor out.

Frequency switching connector is coming
off.

Fan motor connector is coming off.

Check the connector out.

Check the frequency (50Hz/60Hz) in the indoor
unit.

Trouble of the Indoor P.C.board. Check the fan motor output of the Indoor

P.C.board.

Trouble of the fan motor.

Check the resistance value between the each tap
of fan motor.

Check the Indoor P.C.board out.

31

4. Test point of P.C.board

(1) Indoor electronic control P.C. board

Fan motor power supply 220 - 240V AC

75643218

Lo

60Hz

Hi

Fuse 250V AC 3.15A

Power supply
input 220-240V AC

12V DC

5V DC

+
–

+
–

Time short point

Indoor coil thermistor (RT12)

VLo Lo

50Hz

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12)
Room temperature thermistor (RT11)

40

30

20

Resistance (K')

10

0

0

10 20 30 40 50 60

Temperature ( C)

32

(2) Remote controller interface P.C. board

To
Indoor electronic
control P.C.board

To
REMOTE CONTROLLER

– JP15= 0V
+ JP16= 12V DC
+ JP17= 5V DC

AUTO RESTART
FUNCTION

4degrees up
Function

Outdoor fan motor

220-240V AC

Solenoid coil

220-240V AC

R601
5~10V DC

+

INPUT

220-240V AC

Defrost thermistor(RT61)

Fuse 2A/250V

Defrost interval
time short pin

}

J9
J8

5V DC

Defrost interval
Defrost termination
temperature change
Jumper wire JPC and JPE

}

52C

12V DC

+

}

12V DC

+

}

}

}

}

}

DEICER P.C. BOARD

+

33

(3) Deicer P.C. board

34

Measure the resistance between the terminals with a tester.
(Coil wiring temperature10°C ~ 30°C)

Compressor

Room
temperature
thermistor

5. Trouble criterion of main parts

Part name

Indoor coil
thermistor

Indoor fan
motor

Outdoor fan
motor

Check method and criterion

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

Measure the resistance between the terminals with a tester.
(Coil wiring temperature -10°C ~ 40°C)

Measure the resistance between the terminals with a tester.
(Coil wiring temperature -10°C ~ 40°C)

Figure

C

S

R

BLK

RED

WHT

BLK RED ORNYLW

BLU

BRN

WHT

GRN

YLW

P

Normal

8kΩ ~ 20kΩ

Abnormal

Opened or short-circuited

Normal

1.6VR

1.87~2.30Ω

3.44~4.22Ω

2VR

0.94~1.16Ω

1.99~2.44Ω

C-R

C-S

Normal

Abnormal

Opened or

short-circuited

2AR

WHT-BLK

Normal

Abnormal

Opened or

short-circuited

102 ~ 126Ω

97.9 ~ 120Ω

2VR
WHT-BLK
BLK-RED

1.6VR

115 ~ 141Ω
118 ~ 146Ω

1.6AR

155.5~168.2Ω241.4~261.2Ω

BLK-BLU

48.3~52.3Ω19.0~20.6Ω

BLU-YLW

17.8~19.4Ω25.4~27.5Ω

YLW-BRN

7.6~8.3Ω12.6~13.7Ω

BRN-RED

37.6~40.7Ω47.9~51.9Ω

Abnormal

Opened or

short-circuited

1.6/2VR

BLK

RED ORN

WHT

MAIN

AUX

P

: Inner protector

p

2.5VR

0.84~1.04Ω

1.82~2.24Ω

55.3 ~ 67.7Ω

2.5VR

BLK-YLW
YLW-RED

26.6 ~ 32.6Ω

55.4 ~ 67.9Ω

2.5VR

BLK YLW

RED ORN

WHT

MAIN

AUX.2

AUX.1

P

Defrost
thermistor
(Outdoor)

Measure the resistance with a tester.
(Part temperature - 10°C ~ 40°C)

Normal

5kΩ ~ 60kΩ

Abnormal

Opened or short-circuited

Indoor Unit : SEH-1.6AR.TH SEH-2AR.TH SEH-2.5AR.TH
Outdoor Unit : SUH-1.6VR.TH SUH-2VR.TH SUH-2.5VR.TH

2.5AR

97.0~105Ω

53.8~58.3Ω

14.0~15.3Ω

6.3~6.9Ω

27.0~29.3Ω

35

1. Removing the electrical parts

(1) Remove the 2 screws and the electrical parts cover.

(See Photo 1.)

● Indoor controller board

● Transformer

● Run capacitor

● Fuse (3.15A)

● Terminal block

(See Photo 2.)

DISASSEMBLY PROCEDURE9

Indoor Unit : SEH-1.6AR.TH SEH-2AR.TH SEH-2.5AR.TH

OPERATING PROCEDURE PHOTOS

2. Removing the indoor coil thermistor(RT12)

(1) Remove the electrical parts cover.

(See Photo 1.)

(2) Remove the 2 screws and the service panel.

(See Photo 1.)

(3) Remove the thermister (RT12) from the holder.

(See Photo 3.)

(4) Disconnect the connector (CN112) from the indoor

controller board and pull the lead wire of thermistor
(RT12) out.

Drain pan

Electrical parts cover

Service panel

Front panel

Set screws
(for drin pan)

Fuse

Set screws

Terminal block

Transformer

Run capacitor

Thermistor

(RT12)

Photo 2.

Photo 3.

Photo 1.

36

3. Removing the room temp. thermistor(RT11)

(1) Remove the electrical parts cover.

(See Photo 1.)

(2) Remove the front panel at fan side.(12 screws)

(See Photo 1.)

(3) Remove the thermister (RT11) from the fan casing.

(See Photo 4.)

(4) Disconnect the connector (CN113)from the indoor

controller board and pull the lead wire of
thermistor (RT11) out.

PHOTOS

OPERATING PROCEDURE

4. Removing the sirocco fan and the fan moter.

(1) Remove the electrical parts cover.

(See Photo 1.)

(2) Remove the front panel at fan side.(12 screws)

(See Photo 1.)

(3) Disconnect the fan motor connector from the indoor

controller board

(See Photo 2.)

(4) Remove the thermistor (RT11) from the fan casing.

(See Photo 4.)

(5) Undo the 4 claws and remove the fan claws.(down side)

<Either left or right>

(See Photo 4.)

(6) Remove the motor bands. (A screw each on left and

right.)

(See Photo 4.)

(7) Disconnect the earth wire.(from the fan motor leg.)

(See Photo 5.)

(8) Remove the fan motor and the sirocco fan by assembly.

(See Photo 5.)

(9) Unscrew the setting screw and remove the sirocco fan.

<Either left or right>

(See Photo 5.)

Set screw

Earth wire

Motor bands

Thermistor

(RT11)

Claws

Screws

Fan casing

Fan motor

Claws

Photo 4.

Photo 5.

37

5. Removing the drain pan

(1) Unscrew each set screw on the right and left, and

remove the drain pan pushing it toward the the back.

(See Photo 1.)

PHOTOS

OPERATING PROCEDURE

6. Removing the heat exchanger

(1) Remove the drain pan.

(See Photo 1.)

(2) Remove the Under flange at heat exchanger side.

(16 screws)

(See Photo 6.)

(3) Remove the 4 screws of heat exchanger.( 2 screws

each on left and right)

(See Photo 7.)

(4) Remove the service panel.( 3 screws )

(See Photo 7.)

(5) Put the heat exchanger down to the fan motor and

pull it toward you.

(See Photo 7.)

Screws

Under flange

Screws

(for heat exchanger)

Service panel

Screws
(for service panel)

Heat exchanger

Photo 6.

Photo 7.

38

OPERATING PROCEDURE PHOTOS

1. Removing the front panel

(1) Remove the screws of the front panel.
(2) Hold the bottom of the front panel on the both side to

remove the cabinet.

2. Removing the deicer P.C. board

(1) Remove the service panel and the front panel.
(2) Disconnect all the connectors and the terminals on the

deicer P.C. board.

(3) Remove the deicer P.C. board.

Ourtdoor Unit : SUH-1.6VR.TH SUH-2VR.TH

Photo 1

Photo 3

Photo 2

Black lead wire

White lead wire

Screws

Screws

Service
panel

Terminal
block

Screws

Red lead wire

Deicer
P.C. board

39

OPERATING PROCEDURE PHOTOS

3. Removing the outdoor fan motor

(1) Remove the front panel. (Refer to 1)
(2) Unconnect the connector remove the clamp of fan motor

lead wire.
(3) Remove the propeller nut and remove the propeller fan.
(4) Remove screws fixing the fan motor.

4. Removing the compressor

(1) Remove the front panel. (Refer to 1)
(2) Remove the soundproof felt.
(3) Remove the terminal cover on the compressor
(4) Remove the electrical assembly.

(Refer to 2)
(5) Release gas from the refrigerant circuit.
(6) Disconnect the welded part of the discharge pipe
(7) Disconnect the welded part of the suction pipe.
(8) Remove nuts fixing the compressor.
(9) Remove the compressor.

Photo 5

Terminal cover

Compressor

Discharge
pipe

Suction
pipe

Compressor nuts

Photo 4

propeller fan

Set screws for
outdoor fan motor

Lead clamps

Outdoor
fan motor

Propeller
fan nut

Set screws for
outdoor fan motor

40

OPERATING PROCEDURE PHOTOS

1. Removing the electrical parts

(1)

Remove the 5 screws and the top panel. (3 screws in
front and 2 screws in rear

)

(2)

Remove the screw of the cover panel. To remove the
cover panel, pull it toward you and unhook the catches
from the side panel.

(3)

Remove the screw of the service panel. To remove the

service panel, pull it down toward you and unhook the
catches on the both sides.

2. Removing the fan motor

(1)

Remove the 3 screws of the front panel. Open the
front panel to a 45-degree angle. Then lift it and
unhook the 3 catches to remove.

(2)

Remove the propeller fan nut and the propeller fan.

(3)

Remove the 3 screws and the fan motor.
Disconnect the lead connectors.

Photo 1

Photo 2

Photo 3

Top panel

Service panel

Panel cover

Front panel

Capacitor

Contactor

Terminal blockScrews

Screws

Ourtdoor Unit : SUH-2.5VR.TH

Propeller fan nut

Valve bed

Lead
connectors

Separator support plate

Motor support

Propeller

fan

41

OPERATING PROCEDURE PHOTOS

3. Removing the heat exchanger and the compressor

(1)

Remove the rear panel (2 screws in front, 1 screw on
the side, 3 screws in the rear). Remove the valve bed,
and open the rear panel to the rear to remove.

NOTE :

All panels are fixed by catches, and must be removed by
shifting up and down.

(2)

Remove the 4 screws of the right side panel and
remove it.

(3)

Remove the 3 screws of the rear guard and remove it.

(4)

Remove the 4 screws of the separator support plate
and remove it.

(5)

Remove the 2 screws of the motor support and
remove it.

(6)

Remove the 5 screws of the valve bed.
The valve bed is fixed by the catches on the right and
left sides.
Lift it to remove.

(7)

Remove the electrical parts box.
Disconnect the connectors from the high pressure
switch, crank case heater, shell thermo, and fan motor
lead.

(8)

Remove the 2 screws of the separator and remove it.

(9)

Remove the 2 screws of the heat exchanger and
remove it.
Detach the welded point of pipe.

(

10

)

Remove the 3 nuts of the compressor and remove it.
Detach the welded points of the compressor suction
pipe and discharge pipe.

Photo 4

Photo 5

Photo 6

Compressor

Ball valve

Charge plug

Heat exchanger

Accumulator

Screws

Screws

42

PARTS LIST10

No.

Parts No.

Parts name

Specification

Remarks

Unit

Amount

Wiring

Diagram

Symbol

Recom­mended

Q'ty

Q'ty/set

Price

1
2
3
4

5

6
7

8

9
10
11
12
13
14

FRONT PANEL
RIGHT SIDE PANEL
LEFT SIDE PANEL
BASE
FAN MOTOR
FAN MOTOR
FAN MOTOR
SIROCCO FAN
RUBBER MOUNT
INDOOR HEAT EXCHANGER
INDOOR HEAT EXCHANGER
INDOOR HEAT EXCHANGER
DRAIN PAN
RIGHT LEG
LEFT LEG
INDOOR COIL THERMISTOR
ROOM TEMPERARURE THERMISTOR
SEPARATOR ASSY

E07 039 000
E07 051 085
E07 039 086
E07 039 290
E07 039 300
E07 040 300
E07 041 300
E07 039 500
E02 179 505
E07 039 620
E07 040 620
E07 041 620
E07 039 700
E07 039 808
E07 039 809
E07 039 307
E07 039 308
E07 039 293

(Drawing No.)

MF
MF
MF

RT12
RT11

SEH-1.6

SEH-2
AR.TH

SEH-2.5

1
1
1
1
1

2
2
1

1
2
2
1
1
1

1
1
1
1

1

2
2

1

1
2
2
1
1
1

1
1
1
1

1
2
2

1
1
2
2
1
1
1

INDOOR UNIT
STRUCTURAL PARTS
SEH-1.6AR.TH
SEH-2AR.TH
SEH-2.5AR.TH

12

8

9

1

13

6

7

11

3

4

2

5

Part number that are circled is not shown in the illustration.

14

43

INDOOR UNIT
ELECTRICAL PARTS
SEH-1.6AR.TH
SEH-2AR.TH
SEH-2.5AR.TH

SEH-1.6 SEH-2 SEH-2.5

AR.TH

No.

Parts No.

Parts name

Specification

3.15A

Remarks

(Drawing No.)

Unit

Amount

Wiring

Diagram

Symbol

Recom-

mended

Q'ty

Q'ty/set

Price

1
2
3
4
5
6
7
8
9

10

11
12

CABLE(FOR BOARD)
REMOTE CONTROLLER CABLE
COMPRESSOR CONTACTOR
TERMINAL BLOCK
TERMINAL BLOCK
FUSE
VARISTOR
REMOTE CONTROLLER
REMOTE CONTROLLER COVER
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
REMOTE CONTROLLER INTERFACE P.C. BOARD
CONTROLLER COVER

1
1
1
1
1
1
1
1
1

1

1
1

E07 039 087
E07 027 089
E02 138 340
E02 367 377
E02 199 374
E02 127 382
E02 085 385
E07 039 426
E07 027 088
E07 039 450
E07 040 450
E07 041 450
E07 039 454
E07 039 449

52C

TB
TB

F11

NR11

1
1
1
1
1
1
1
1
1
1

1
1

1
1
1
1
1
1
1
1
1

1
1
1

L,N,
3,2,N,

8921 11 10

4

5

3

6

Part number that are circled is not shown in the illustration.

44

OUTDOOR UNIT
STRUCTURAL PARTS
SUH-1.6VR.TH
SUH-2VR.TH

2

6

15

10

9

32517 19 18 26 4 24

3252120 1

8

45

No.

Parts No.

Parts name

Specification

Remarks

Unit

Amount

Wiring

Diagram

Symbol

Recom-

mended

Q'ty

Q'ty/set

Price

1
2
3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

(Drawing No.)

S-N18EX
S-N11EX

3.0MF-440VAC
50MF-440VAC
35MF-440VAC

3RUBBER
4RUBBER

RH-247VHAT
NH-38VMDT

[3.0O[1.8OR330
[3.0O[1.6OR860
[4.0O[2.4OR660
[3.0O[1.6OR550

MF
MF
RT61
52C1
52C1
C65
C1
C1
TB
F

DSAR
NR61

21S4
21S4

1
1
1

1
1

1

1
1

1
1
1
1
1
1
1

1
1
3

1
1

1

1
1
1

1
1

1

1
1

1
1
1
1

1
1
1
1

1
1
1

1
1

1
1
1
1
1

1
1

1

4
1
1
1

1

1

1
1

1

1
1

2
1

1
1
1

FRONT PANEL
BACK PANEL (OUT)
SERVICE PANEL
BASE
BASE
FAN MOTOR
FAN MOTOR
DEFROST THERMISTOR
COMPRESSOR CONTACTOR
COMPRESSOR CONTACTOR
FAN MOTOR CAPACITOR
COMPRESSOR CAPACITOR
COMPRESSOR CAPACITOR
TERMINAL BLOCK
FUSE (OUT)
FUSE HOLDER
SURGE ABSORBER 1
VARISTOR
DEICER P.C. BOARD
DEICER P.C. BOARD
SOLENOID COIL
SOLENOID COIL
PROPELLER FAN
COMPRESSOR RUBBER MOUNT
COMPRESSOR RUBBER MOUNT
MOTOR SUPPORT
GRILLE (OUT)
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
RESTRICTOR VALVE
RESTRICTOR VALVE
DIS PRESSURE REGULATOR
STOP VALVE (GAS)
STOP VALVE (GAS)
STOP VALVE (LIQUID)
COMPRESSOR
COMPRESSOR
ACCUMULATOR
ACCUMULATOR
STRAINER 1
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
SURGE ABSORBER2
SURGE ABSORBER3
REVERSING VALVE

E02 141 232
E02 140 233
E02 141 245
E02 139 290
E02 201 290
E02 141 301
E02 144 301
E02 139 310
E07 012 340
E07 042 340
E02 214 351
E02 082 353
E02 089 353
E02 198 374
E02 095 382
E07 001 241
E02 128 383
E02 085 385
E07 042 451
E07 043 451
E02 139 490
E02 156 490
E02 141 501
E02 075 506
E02 138 506
E02 139 515
E02 141 521
E02 139 630
E07 042 630
E02 096 642
E02 154 642
E07 042 644
E02 140 661
E02 150 661
E02 139 662
E07 042 900
E07 043 900
E02 134 932
E02 258 932
E07 042 933
E07 042 936
E07 043 936
E07 049 936
E07 042 937
E07 042 384
E02 214 386
E02 077 961

MC
MC

CR
CZ

2A

SUH-1.6 SUH-2

VR.TH

Part number that are circled is not shown in the illustration.

46

9

6

828 5

3

29

30

11

32

10

26

37 36 35

121315

24

27

1819 25

2

2

1

31

14 41

38
33

16

OUTDOOR UNIT
STRUCTURAL PARTS

SUH-2.5VR.TH

7

20

47

Part number that are circled is not shown in the illustration.

No.

Parts No.

1

E07 001 006

2

E07 001 009

3

E02 214 232

4

E07 001 241

5

E02 214 245

6

E02 214 249

7

E02 077 961

8

E02 214 290

9

E02 214 297

10

E02 214 301

11

E02 214 310

12

E07 012 340

13

E02 288 343

14

E02 138 351

15

E02 082 353

16

E02 198 374

17

E07 044 374

18

E02 214 381

19

E02 095 382

20

E02 128 383

21

E02 214 384

22

E02 085 385

23

E02 214 386

24

E07 044 451

25

E02 156 490

26

E02 214 501

27

E02 138 506

28

E02 214 515

29

E02 214 521

30

E02 214 522

31

E07 003 523

32

E02 214 630

33

E07 001 641

34

E07 042 644

35

E02 010 661

36

E02 010 662

37

E02 042 900

38

E02 214 932

39

E07 044 933

40

E07 050 933

41

E07 044 936

Parts name

PANEL COVER
HANDEL
FRONT PANEL
FUSE HOLDER
SERVICE PANEL
LEFT SIDE PANEL
REVERSING VALVE
BASE
TOP PANEL
FAN MOTOR
DEFROST THERMISTOR
COMPRESSOR CONTACTOR
FAN MOTOR RELAY
FAN MOTOR CAPACITOR
COMPRESSOR RUN CAPACITOR
TERMINAL BLOCK
TERMINAL BLOCK
THERMAL REED SWITCH
FUSE(OUT)
SURGE ABSORBER 1
SURGE ABSORBER 2
VARISTOR
SURGE ABSORBER 3
DEICER P.C. BOARD
SOLENOID COIL
PROPELLER FAN
COMPRESSOR RUBBER MOUNT
MOTOR SUPPORT
FAN GUARD
REAR PANEL
REAR GUARD
OUTDOOR HEAT EXCHANGER
CHARGE PLUG
DIS PRESSURE REGULATOR
BALL VALVE(GAS)
BALL VALVE(LIQUID)
COMPRESSOR
ACCUMULATOR
STRAINER 2
STRAINER 3
CAPILLARY TUBE

Specification

2A

Q'ty/set

SUH-2.5VR.TH

1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1

Remarks

(Drawing No.)

S-N18EX

3.0MF-440VAC
50MF-440VAC

4RUBBER

5/8"
3/8"
NH-47VMDT

{4.0X{2.0XR410

Wiring

Diagram

Symbol

MF
RT61
52C1
X1
C2
C1
TB
TB2
26F1
F
DSAR
CR
NR61
CZ

21S4

MC

Recom­mended

Q'ty

Unit

Price

Amount

HEAD OFFICE MITSUBISHI DENKI BLDG.MARUNOUCHI TOKYO100 TELEX J24532 CABLE MELCO TOKYO

CCopyright 1998 MITSUBISHI ELECTRIC ENGINEERING CO., LTD.
Issued in Aug.1998. No. OC165 96
Printed in Japan.

New publication, effective Aug. 1998.
Specifications subject to change without notice.

OPTIONAL PARTS

11

1. REFRIGERANT PIPES

The air conditioner has flared connections its indoor and outdoor sides.
Please use the optional extension pipe as follows.

3. AIR FILTER

Applied unit

SEH-1.6AR.TH

SEH-2AR.TH

SEH-2.5AR.TH

Models

PAC - 1000 FT

Applied unit

SEH-1.6AR.TH

SEH-2AR.TH

Models Pipe length

Pipe size O.D.mm (in.)

Cross-section A-Gas

{12.7

(1/2)

{15.88

(5/8)

{6.35

(1/4)

{27

{31

{21

{27

0

150
400

0

150
400

B-liquid

Insulation

CD

3m
5m

7m
10m
15m

3m

5m

7m
10m
15m

MAC-680PI
MAC-681PI
MAC-682PI
MAC-683PI
MAC-684PI

MAC-670PI
MAC-671PI
MAC-672PI
MAC-673PI
MAC-674PI

Additional

refrigerant

charge

R-22(g)

SEH-2.5AR.TH

0

195
520

3m

5m

7m

10m
15m

MAC-860PI
MAC-861PI
MAC-862PI
MAC-863PI
MAC-864PI

{9.52

(3/8)

2. REMOTE CONTROLLER EXTENSION CABLE

When installing the remote controller at a distance from the air conditioner, use the designated extension cable with
connector.

Part No.

Length

PAC-905EC

12m

PAC-906EC

20m

PAC-918EC

30m

PAC-919EC

50m