Mitsubishi MXZ-8A140VA/VA1/VA2/VA3, PAC-AK50BC, PAC-AK30BC, PAC-AK51BC, PAC-AK31BC Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

April 2010

No. OC316

REVISED EDITION-E

HFC

utilized

R410A

[Model name]

[Service Ref.]

<Outdoor unit>

MXZ-8A140VA MXZ-8A140VA
MXZ-8A140VA1

MXZ-8A140VA2
MXZ-8A140VA3

<Branch box>

PAC-AK50BC PAC-AK50BC
PAC-AK30BC PAC-AK30BC
PAC-AK51BC PAC-AK51BC
PAC-AK31BC PAC-AK31BC

(Indispensable optional parts for MXZ-8A140VA)

CONTENTS

1. TECHNICAL CHANGES

2. SAFETY PRECAUTION

3. OVERVIEW OF UNITS

4. SPECIFICATIONS

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

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

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

OUTDOOR UNIT

Model name
indication

5. DATA

6. OUTLINES AND DIMENSIONS

7. WIRING DIAGRAM

8.

9. TROUBLESHOOTING

10. ELECTRICAL WIRING

11. WIRING SPECIFICATIONS

12. SYSTEM CONTROL

13. REFRIGERANT PIPING TASK

14. DISASSEMBLY PROCEDURE

15. PARTS LIST

16. RoHS PARTS LIST

17. OPTIONAL PARTS

Revision:

PAC-AK51/31BC are added

•
in

REVISED EDITION-E.

• Some descriptions have
been modified.

•

Please void OC316
REVISED EDITION-D.

NOTE:

• This service manual
describes technical data of
outdoor unit and branch box.
As for indoor units, refer to
its service manual.

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

• For servicing RoHS com­pliant products, refer to the
RoHS PARTS LIST.

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Back cover

2

3

6

14

16

19

21

25

27

75

76

77

79

82

88

95

BRANCH BOX

INDOOR UNITS COMBINATION SHEETS

1 TECHNICAL CHANGES

MXZ-8A140VA2 MXZ-8A140VA3

The parts below have been changed.

• THERMISTOR (DISCHARGE/TH4) (Connector change)

• CONTROLLER CIRCUIT BOARD (C.B)

• NOISE FILTER CIRCUIT BOARD (N.F.)

• ACTIVE FILTER MODULE (ACTM)

• RELAY (52C), RESITOR (RS) (including N.F.)

MXZ-8A140VA1 MXZ-8A140VA2

The parts below have been changed.

• FOUR-WAY VALVE AND COIL (21S4)

• CONTROLLER CIRCUIT BOARD (C.B.)

• FAN MOTOR (MF1, MF2)

• SOLENOID VALVE AND COIL (SV2)

MXZ-8A140VA MXZ-8A140VA1

The parts below have been changed.

• POWER CIRCUIT BOARD (P.B.)

• NOISE FILTER CIRCUIT BOARD (N.F.)

• THERMISTOR (OUTDOOR/TH7)
(Length change)

2

2 SAFETY PRECAUTION

2-1. ALWAYS OBSERVE FOR SAFETY

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

2-2. CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilizing refrigerant R410A

Use new refrigerant pipes.

Make sure that the inside and outside of refrige­rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.

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

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

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

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

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

Do not use refrigerant other than R410A.

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

Use a vacuum pump with a reverse flow check
valve.

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

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

The following tools are necessary to use R410A refrigerant.

Tools for R410A
Gauge manifold
Charge hose

Gas leak detector

Torque wrench

Flare tool
Size adjustment gauge
Vacuum pump adaptor

Electronic refrigerant
charging scale

Handle tools with care.

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

Charge refrigerant from liquid phase of gas
cylinder.

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

Do not use a charging cylinder.

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

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

3

[1] Cautions for service

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

Be sure to use a filter drier for new refrigerant.

[2] Additional refrigerant charge

When charging directly from cylinder

· Check that cylinder for R410A on the market is syphon type.

· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

Unit

Gravimeter

[3] Service tools

(1) Use the below service tools as exclusive tools for R410A refrigerant.

No.

Gauge manifold

1

Charge hose

2

Electronic scale

3

Gas leak detector · Use the detector for R134a, R407C or R410A.

4

Adaptor for reverse flow check · Attach on vacuum pump.

5

Refrigerant charge base

6

Refrigerant cylinder

7

Refrigerant recovery equipment

8

Tool name Specifications

· Only for R410A

· Use the existing fitting

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

· Only for R410A

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

· Only for R410A · Top of cylinder (Pink)

· Cylinder with syphon

specifications

. (UNF1/2)

4

(2) Cautions for refrigerant piping work

New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same
as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working
pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.

1 Thickness of pipes

Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness
shown below. (Never use pipes of 0.7 mm or below.)

Diagram below: Piping diameter and thickness

Nominal

dimensions(inch)

1/4

3/8
1/2
5/8
3/4

Outside

diameter

6.35

9.52

12.70

15.88

19.05

(mm)

Thickness

R410A R22

0.8

0.8

0.8

1.0

—

(mm)

0.8

0.8

0.8

1.0

1.0

2 Dimensions of flare cutting and flare nut

The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that,
R410A is a refrigerant, which has higher risk of leakage because of its working pressure higher than that of other refriger­ants. Therefore, to enhance airtightness and intensity, flare cutting dimension of copper pipe for R410A has been speci­fied separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A also
has partly been changed to increase intensity as shown below. Set copper pipe correctly referring to copper pipe flaring
dimensions for R410A below. For 1/2” and 5/8”, the dimension B changes.
Use torque wrench corresponding to each dimension.

Dimension A

Flare cutting dimensions

Nominal

dimensions(inch)

1/4
3/8
1/2
5/8
3/4

Outside

diameter

6.35

9.52

12.70

15.88

19.05

Dimension A

R410A R22

9.1

13.2

16.6

19.7

—

+0

( )

-0.4

9.0

13.0

16.2

19.4

23.3

(mm)

Flare nut dimensions

Nominal

dimensions(inch)

1/4
3/8
1/2
5/8
3/4

Outside

diameter

6.35

9.52

12.70

15.88

19.05

3 Tools for R410A (The following table shows whether conventional tools can be used or not.)

Tools and materials Use R410A tools Can R22 tools be used?
Gauge manifold

Charge hose
Gas leak detector

Refrigerant recovery equipment
Refrigerant cylinder
Applied oil

Safety charger

Charge valve

Vacuum pump

Flare tool

Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale

Vacuum gauge or thermis­tor vacuum gauge and
vacuum valve
Charging cylinder

: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.

Air purge, refrigerant charge
and operation check
Gas leak check
Refrigerant recovery
Refrigerant charge
Apply to flared section

Prevent compressor malfunction
when charging refrigerant by

spraying liquid refrigerant
Prevent gas from blowing out

when detaching charge hose
Vacuum drying and air
purge

Flaring work of piping

Bend the pipes
Cut the pipes
Weld the pipes
Refrigerant charge
Check the degree of vacuum. (Vacuum

valve prevents back flow of oil and refri­gerant to thermistor vacuum gauge)
Refrigerant charge

Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil and alkylbenzene
oil (minimum amount)
Tool exclusive for R410A

Tool exclusive for R410A

Tools for other refrigerants can
be used if equipped with adop­ter for reverse flow check
Tools for other refrigerants

can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used

Tool exclusive for R410A

(Usable if equipped

with adopter for rever­ se flow)

(Usable by adjusting
flaring dimension)

Dimension B

Dimension B

R410A R22

17.0

22.0

26.0

29.0

—

Can R407C tools be used?

Ester oil:
Alkylbenzene oil: minimum amount

(Usable if equipped

with adopter for rever­ se flow)

(Usable by adjusting

flaring dimension)

17.0

22.0

24.0

27.0

36.0

(mm)

5

3 OVERVIEW OF UNITS

3-1. CONSTRUCTION OF SYSTEM

MXZ-8A140VA/ MXZ-8A140VA

Rated capacity (kW)

Outdoor unit

Indoor unit

Capacity

that can be
connected

Number of units
Total system wide capacity

Branch box
that can be

Number of units

connected

Connectable indoor unit lineup (Heat pump inverter type)

Model type

Deluxe

Wall
mounted

Ceiling
concealed

4-way
ceiling cassette

Floor standing
1-way ceiling cassette

<NOTE> The lineup of a connectable indoor unit depends on a district/areas/country.

Standard

Compact
Low static pressure

Middle static pressure

High static pressure

2 by 2 type
Standard

MSZ-FA25/35VA
MSZ-FB25/35/50VA(H)
MSZ-FD25/35/50VA
MSZ-GA22/25/35/50/60/71/80VA
MSZ-GB50VA
MSZ-GC22/25/35VA
MSZ-GC22/25/35/50/60/71NA
MSZ-GE22/25/35/42/50/60/71VA/NA
MSZ-SF15/20VA
SEZ-KA/KC25/35/50/60/71VA
SEZ-KD25/35/50/60/71VA(L)
PEAD-RP50/60/71EA.UK
PEAD-RP60/71GA.UK
PEAD-RP50/60/71JA(L).UK
PEA-RP71EA
MCFZ-GA35/50/60VA
SLZ-KA25/35/50VA(L)
PLA-RP35/50/60/71AA(.UK)/BA(.UK)
PLA-RP71BA2.UK
MFZ-KA25/35/50VA
MLZ-KA25/35/50VA

Model name

(Cooling/Heating)

Type 15 ~ Type 80

CAUTION : The indoor unit which rated capability exceeds

8.0kW (80 type) can NOT be connected.

2 ~ 8 units

21 ~ 132 % of outdoor unit capacity (3.0 kW ~ 18.5 kW)

1 ~ 2 units

1.5

1

/ MXZ-8A140VA2/ MXZ-8A140VA

14.0/16.0

5HP

R410A

Capacity class (kW)

2.0

2.2 2.5 3.5 5.0 6.0 7.1 8.0

4.2

3

Branch box

Number of branches
Indoor unit that

( )

can be connected

+ Max. 2 branch boxes can be connected to 1 outdoor unit.

PAC-AK50BC
PAC-AK51BC

5 branches

(MAX. 5 units)

2- branch pipe (joint) : Optional parts

In case of using 1- branch box

Model name Connection method

In case of using 2- branch boxes

MSDD-50AR-E
MSDD-50BR-E

+ According to the connection method, you can choose the favorite one.

Option

Optional accessories of indoor units and outdoor units are available.

PAC-AK30BC
PAC-AK31BC

3 branches

(MAX. 3 units)

No need

flare

brazing

6

3-2. SYSTEM OUTLINE

The additional connection of the Branch Box together with employment of the compact trunk-looking outdoor unit can
successfully realizes a long distance piping for big houses. Equipped with a microcomputer, the Branch Box can trans­late the transmission signal of indoor units to achieve the optimum control.

3-2-1. System example

Indoor unit (Ceiling concealed type)

Indoor unit
(Wall mounted type)

Outdoor unit

3-2-2. Method for identifying

■ Outdoor unit

Number of connectable indoor units (MAX.)

Model type

M X Z - 8 A 140 V A

Multi type heat pump
inverter outdoor unit

■ Branch box

Applicable refrigerant
A : R410A

Branch Box

Control and refrigerant
A : New A control and R410A

Power supply
V: Single phase 220/230/240V 50Hz
220V 60Hz

Indicates equivalent to rated cooling capacity.
(0.1kW)

Symbol of factory

P A C - A K 5 0 BC

(Indispensable)
Optional parts

Branch box (Controller)

Model type

Number of branches
5 : 5 branches
3 : 3 branches

7

3-3. TYPICAL COMBINATION EXAMPLE

Branch box is located INSIDE of condominium

Branch box

(Inside)

■ System example of 5 indoor units

Installing branch box indoors

Only 1 piping is required between the outdoor and
indoor offering a fine external view.

Branch box (5 branch type)

Outdoor unit

Living

SEZ-60 MSZ-35 MSZ-35 MSZ-25 MSZ-25

Master
bedroom

Dining Bedroom (1) Bedroom (2)

■ Verification

The rated capacity should be determined by observing the table below. The unit’s quantities are limited in 2 to 8 units.
For the next step, make sure that the selected total rated capacity is in a range of 4.4 ~ 18.5 kW.
The total indoor unit capacity should be within the outdoor units. (= 14.0 kW is preferred).
Combination of excessive indoor units and an outdoor unit may reduce the capacity of each indoor unit.
The rated indoor capacity is as the table below.

Example:

SEZ-60 = 6.0

MSZ-35 = 3.5

MSZ-35 = 3.5

MSZ-25 = 2.5

MSZ-25

+

+

+

+

=2.5

Total rated capacity

18.0 18.5kW

Indoor unit type (capacity class)
Rated capacity (cooling) (kW) 1.5 2.0 2.2 2.5 3.5 4.2 5.0 6.0 7.1 8.0

15 20 22 25 35 42 50 60 71 80

8

3-4. INSTALLATION

3-4-1. Outdoor unit installation location

For best performance, select proper position.

● Avoid places where combustible gas may be generated or leak.

● Avoid direct sunlight or other sources of heat.

● Install sunshade to protect the outdoor unit if direct sunlight hits the unit.

● Install the outdoor unit with enough distance between neighbours as operation noise may disturb the neighbours.

● Avoid the position that the unit is covered by snow or snow blows directly against the air outlet. The snow block or blow will
reduce the airflow of the outdoor unit.
In the areas of heavy snow, special countermeasures must be taken at installation to protect the outdoor unit from malfunc­tion caused by snow.

● Select a location permitting easy wiring and pipe access to the power source and indoor unit.

● Drain water must be drained freely during operation. Check for draining.

3-4-2. Ventilation and service space
(1) Windy location installation

When installing the outdoor unit on a rooftop or other location unprotected from the wind, situate the air outlet of the unit so
that it is not directly exposed to strong winds. Strong wind entering the air outlet may impede the normal airflow and a mal­function may result.
The following shows 3 examples of precautions against strong winds.

● Face the air outlet towards the nearest available wall about 50 cm away from the wall. (Fig. 2-1)

● Install an optional air guide if the unit is installed in a location where strong winds from a typhoon, etc. may directly enter
the air outlet. (Fig. 2-2)

A Air guide

● Position the unit so that the air outlet blows perpendicularly to the seasonal wind direction, if possible. (Fig. 2-3)

B Wind direction

Fig. 2-1



Fig. 2-2



Fig. 2-3

9

(2) When installing a single outdoor unit

0

Minimum dimensions are as follows, except for Max., meaning Maximum dimensions, indicated.
Refer to the figures for each case.

● Obstacles at rear only (Fig. 2-4)

● Obstacles at rear and above only (Fig. 2-5)

· Do not install the optional air outlet guides for upward airflow.

● Obstacles at rear and sides only (Fig. 2-6)

● Obstacles at front only (Fig. 2-7)
w When using an optional air outlet guide, the clearance is 500 mm or more.

● Obstacles at front and rear only (Fig. 2-8)
w When using an optional air outlet guide, the clearance is 500 mm or more.

● Obstacles at rear, sides, and above only (Fig. 2-9)

· Do not install the optional air outlet guides for upward airflow.

Max. 500

1000

200

unit : mm

Fig. 2-4

150

1000

200

300

Fig. 2-5 Fig. 2-6

Max. 500

150

1000

Fig. 2-8Fig. 2-7

250

25

Fig. 2-9

300

1500

500

10

(3) When installing multiple outdoor units

Leave 10 mm space or more between the units.

● Obstacles at rear only (Fig. 2-10)

● Obstacles at rear and above only (Fig. 2-11)

• No more than 3 units must be installed side by side. In addition, leave space as shown.

• Do not install the optional air outlet guides for upward airflow.

● Obstacles at front only (Fig. 2-12)

w When using an optional air outlet guide, the clearance is 1000 mm or more.

● Obstacles at front and rear only (Fig. 2-13)

w When using an optional air outlet guide, the clearance is 500 mm or more.

● Single parallel unit arrangement (Fig. 2-14)

w When using an optional air outlet guide installed for upward airflow, the clearance is 1000 mm or more.

● Multiple parallel unit arrangement (Fig. 2-15)

w When using an optional air outlet guide installed for upward airflow, the clearance is 1500 mm or more.

● Stacked unit arrangement (Fig. 2-16)

• The units can be stacked up to 2 units high.

• No more than 2 stacked units must be installed side by side. In addition, leave space as shown.

unit : mm

1500

300

500

1000

1500

Max. 300

1500

1500

500

Fig. 2-12Fig. 2-11Fig. 2-10

150

2000

600

600

1500

Fig. 2-14Fig. 2-13

Fig. 2-15

3000

500

1500

150

800

Fig. 2-16

11

3-4-3. Space required for Installation and servicing for Branch box.

(1) Front View (Fig. 3-1)

A Branch box
B On the side of piping

(2) Side View (Fig. 3-2, Fig. 3-3)

C For indoor installations
D Ceiling board
E Maintenance hole
F PCB side

w1: A minimum 350 mm is required for 90° bends in refrigerant piping.
w2: A is “Min. 200 mm”.

(Premise: The slope of drain piping is securable 1/100 or more. Required 200 mm or more, when not securable.)

In the case of less than 200 mm (for example A is 100 mm), the exchange work of Branch box from a maintenance hole
becomes difficult (Only exchange work of a PCB, linear expansion valve coils, sensors and drain pan is possible).

w3: B is “

In the case of “

In the case of less than 300 mm (for example A is 100 mm), the exchange work of Branch box, linear expansion
valve coils, sensors, and drain pan from a maintenance hole becomes difficult. Only exchange work of a PCB is possible.

(3) Top View (Fig. 3-4)

G Refrigerant piping
H When facing in the opposite direction to the refrigerant piping.

NOTE1: The branch box is only for indoor use.
NOTE2: Please attach the special optional cover (PAC-AK350CVR-E) to install branch box in the outdoors.

□ 600”.

□ 450”, prepare a maintenance hole at a PCB side as it is shown in Fig. 3-3, and “Min. 300 mm” is needed

as distance A.

(1)

(2)

(3)



Min.

50



+ 1

Min.
250

180-200



450

Fig. 3-1

280

B

+3



unit : mm

Min. 250

Min.

250



198 Min. 30

A

A

+2



450





Fig. 3-3Fig. 3-2



Min. 250



Fig. 3-4

12

3-5. SIMPLIFIED PIPING SYSTEM

Piping connection size

AB

Liquid (mm)

Gas (mm)

W9.52

W15.88

The piping connection size differs according to the type and capacity of indoor units.
Match the piping connection size of branch box with indoor unit.
If the piping connection size of branch box does not match the piping connection size of
indoor unit, use optional different-diameter (deformed) joints to the branch box side.
(Connect deformed joint directly to the branch box side.)

Flare connection employed. (No brazing!)

■ In case of using 1-branch box

Flare connection employed (No brazing)

A

■ In case of using 2-branch boxes

2 branches pipe (joint)
: optional parts

A

A

BB

Branch box

BB B BB

Branch box #1

A

BBB

Branch box #2

■ Installation procedure (2 branch pipe (joint))
Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.

13

4 SPECIFICATIONS

• Outdoor unit : MXZ-8A140VA MXZ-8A140VA1

Service Ref.

Rated Cooling capacity
Rated power consumption +1
Operating current +1
Operating power factor +1

Cooling

Starting current (Outdoor unit)
Rated Heating capacity
Rated power consumption +1
Operating current +1
Operating power factor +1

Heating

Standard performance

Breaker
Max. current (Outdoor unit only)
Power supply (phase, cycle, voltage)
External finish
Refrigerant control
Compressor
Model
Motor output
Starter type
Protection devices
Crankcase heater
Heat exchanger
Fan Fan (drive) % No.
Fan motor output
Airflow
Defrost method
Noise level

OUTDOOR UNIT

Dimensions

Weight
Refrigerant

Oil (Model)
Pipe size O.D.

Connection method

REFRIGERANT PIPING

+1 In case of connecting 3 indoor units (6.0kW class), electrical data is only for outdoor unit.

Conversion formula

:6.35mm

1/4 inch

Starting current (Outdoor unit)

Charge

:9.52mm

3/8 inch

MXZ-8A140VA2 MXZ-8A140VA3

MXZ-8A140VA/ MXZ-8A140VA1/ MXZ-8A140VA2/ MXZ-8A140VA3

kW
kW

A
%

A
kW
kW

A

%

A

A

ANB33FDCMT (MXZ-8A140VA/VA1/VA2)/ANB33FDSMT (MXZ-8A140VA3)

)

2.3 (MEL56) (MXZ-8A140VA/VA1/VA2)/2.3 (FV50S) (MXZ-8A140VA3)

Cooling

Heating

Liquid

Indoor side
Outdoor side

:12.7mm

1/2 inch

W

D
H

Gas

*

/min (CFM

mm (in.)
mm (in.)
mm (in.)

kg (lbs)

kg (lbs)

:15.88mm

5/8 inch

kW

W

kW

dB
dB

L
mm
mm

:19.05mm

3/4 inch

Please refer to "10.ELECTRICAL WIRING".

Single, 50Hz, 220/230/240V, Single, 60Hz, 220V

Linear Expansion Valve (In branch box)

HP switch, LP switch, Discharge thermo

Conversion formula:

14.0

3.79

17.30/16.55/15.86, 17.30

99.6
14

16.0

3.90

17.82/17.05/16.33, 17.82

99.5
14

29.5

Munsell 3Y 7.8/1.1

Hermetic

2.9

Line start

—

Plate fin coil

Propeller fan % 2

0.060 +0.060
100 (3,530)

Reverse cycle

50
52

950 (37-3/8)

330+30 (13+1-3/16)

1,350 (53-1/8)

128 (282)

R410A

8.5 (18.7), 40m

:9.52

:15.88

Flared
Flared

kcal/h = kW % 860
Btu/h = kW % 3412
CFM = m3/min % 35.31

Notes1. Rating Conditions (ISO T1)
Cooling : Indoor : D.B. 27°C (80°F), W.B. 19°C (66°F) Outdoor : D.B. 35°C (95°F), W.B. 24°C (75°F)
Heating : Indoor : D.B. 20°C (68°F) Outdoor : D.B. 7°C (45°F), W.B. 6°C (43°F)
Refrigerant piping length (one way) : Main Piping (From outdoor unit to branch box) : 5m
Branch Piping (From branch box to each indoor units) : each 3m

2. Guaranteed operating range
Indoor

P-series

Cooling

Heating

3. Guaranteed voltage
198~264V, 50Hz 198~242V, 60Hz

4. Above data are based on the indicated voltage.

Single, 50Hz, 220/230/240V, Single, 60Hz, 220V

5. Refer to the service manual of indoor unit for the indoor unit's specifications.

Upper limit
Lower limit
Upper limit
Lower limit

D.B. 35°C, W.B. 22.5°C

D.B. 19°C, W.B. 15°C

D.B. 28°C
D.B. 17°C

M-series, S-series

D.B. 32°C, W.B. 23°C

D.B. 21°C, W.B. 15°C

D.B. 27°C
D.B. 20°C

Outdoor

D.B. 46°C

D.B. –5°C

D.B. 21°C, W.B. 15°C

D.B. –15°C, W.B. –15°C

14

• Branch box : PAC-AK50BC PAC-AK30BC
PAC-AK51BC PAC-AK31BC

Model name

Connectable number of indoor units
Power supply (from outdoor unit)
Input
Running current
External finish
Drain hose size (on site)

Dimensions

Weight

Piping
connection
(Flare)

Wiring

W

The piping connection size differs according to the type and capacity of indoor units. Match the piping connection size for indoor

Width
Depth
Height

Branch (indoor side)

Main (outdoor side)

To indoor unit
To outdoor unit



Liquid

Gas

Liquid

Gas

kW

mm
mm
mm
mm

kg
mm
mm
mm
mm

A

:9.52 4 {A,B,C,D}, :12.7 % 1{E}

PAC-AK50BC
PAC-AK51BC

MAX. 5

Single phase, 220/230/240V, 50Hz, Single phase, 220V, 60Hz

0.003

0.05

Galvanized sheets

O.D.20 (VP-16)

450
280
198

9.3

:6.35 5 {A,B,C,D,E}

:9.52

:15.88

Each 3-wire, plus earth wire

3-wire, plus earth wire

PAC-AK30BC
PAC-AK31BC

MAX. 3

8.1

:6.35 3 {A,B,C}
:9.52 3 {A,B,C}

and branch box. If the piping connection size of branch box does not match the piping connection size of indoor units, use
optional different-diameter (deformed) joints to the branch box side. (Connect deformed joint directly to the branch box side.)

15

5 DATA

5-1. CORRECTING COOLING AND HEATING CAPACITY

5-1-1. Correcting Changes in Air Conditions

(1) The performance curve charts (Figure 1-1, 1-2, 2-1, 2-2) show the change ratio of capacity and input (power consumption)

according to the indoor and outdoor temperature condition when define the rated capacity (total capacity) and rated input
under the standard condition in standard piping length (5 m) as “1.0”.

• Standard conditions:

Rated cooling capacity

Rated heating capacity

• Use the rated capacity and rated power values given in the characteristics table for each indoor unit.

• The capacity is the single value on the side of the outdoor unit;
The capacity on the sides of each indoor unit must be added to obtain the total capacity.

(2) The capacity of each indoor unit may be obtained by multiplying the total capacity obtained in (1) by the ratio between the

individual capacity at the rated time and the total capacity at the rated time.

Indoor D.B. 27 °C / W.B. 19 °C
Outdoor D.B. 35 °C

Indoor D.B. 20 °C
Outdoor D.B. 7 °C / W.B. 6 °C

Individual capacity under stated conditions =Total capacity under the stated conditions o

(3) Capacity correction factor curve

Fig. 1-1
Cooling capacity

1.4

1.2

1

0.8

Cooling capacity ratio

0.6

-5 0 5 10 15 20 25 30 35 40 46

Outdoor intake air dry-bulb temperature <D.B. >

Indoor intake air wet-bulb temperature <:W.B.>

Fig. 2-1
Heating capacity

1.2

1.0

0.8

22

20

18

0.6

Cooling input ratio

16

0.4

Fig. 1-2
Cooling input

-5 0 5 10 15 20 25 30 35 40 46

Outdoor intake air dry-bulb temperature <D.B. >

Fig. 2-2
Heating input

Individual capacity at the rated time

Total capacity at the rated time

Indoor intake air wet-bulb temperature <:W.B.>

22

20

18
16

Indoor intake air dry-bulb temperature <:D.B.>

Outdoor intake air wet-bulb temperature <:W.B.> Outdoor intake air wet-bulb temperature <:W.B.>

Indoor intake air dry-bulb temperature <:D.B.>

Note : These diagrams show the case where the operation frequency of a compressor is fixed.

16

5-1-2. Correcting Capacity for Changes in the Length of Refrigerant Piping

To obtain the ratio (and the corrected piping length) of the outdoor units rated capacity and the total in-use indoor capacity, first
find the capacity ratio corresponding to the standard piping length from Fig. 3, Fig. 4 and then multiply by the capacity from
Fig.1-1, 1-2, Fig. 2-1, 2-2 to obtain the actual capacity.

(1) Capacity correction factor
Fig. 3 Cooling capacity correction curve

1.00

20 40 60 80

0.95

0.90

Cooling
Capacity
(ratio)
[%]

0.85

0.80

0.75

0.70

0.65

Fig. 4 Heating capacity correction curve

20 40 60 80

Corrected piping length (m)

1

Total rated capacity of indoor units (kW)

2.2 (15.7%)

7.0 (50%)

10.5 (75%)

14.0 (100%)

18.5 (132%)

Heating
Capacity
(ratio)
[%]

0.95

0.9
20 40 60 80

Corrected piping length (m)

(2) Method for Obtaining the Corrected Piping Length

Corrected piping length = (Actual piping length between outdoor unit and the farthest indoor unit) + (0.30 o number of bends in the piping) (m)

17

5-2. NOISE CRITERION CURVES

MICROPHONE

1m

1.5m

MXZ-8A140VA
MXZ-8A140VA

1

MODE

COOLING

HEATING

MXZ-8A140VA2
MXZ-8A140VA3

90

UNIT

GROUND

SPL(dB)

50
52

LINE

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

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

18

6 OUTLINES AND DIMENSIONS

6-1. OUTDOOR UNIT unit : mm
MXZ-8A140VA MXZ-8A140VA1 MXZ-8A140VA2 MXZ-8A140VA3

1 FREE SPACE (Around the unit)

The diagram below shows a basic
example.
Explanation of particular details are
given in the installation manuals etc.

FREE

Over 10mm

Over 150mm

Over 10mm

r 1000mm

Ove

Example of Notes

···Refrigerant GAS pipe connection (FLARE):15.88(5/8 inch)
···Refrigerant LIQUID pipe connection (FLARE):9.52(3/8 inch)

Indication of STOP VALVE connection location

2 SERVICE SPACE

Dimensions of space needed
for service access are
shown in the below diagram.

Over

10

Service space

Over

Rear Air Intake

Side Air Intake

500

3 FOUNDATION BOLTS

Please secure the unit firmly
with 4 foundation (M10) bolts.
(Bolts and washers must be
purchased locally.)

150

Over

<Foundation bolt height>

500

Over

Less than

30

Side Air Intake

Handle for moving

FOUNDATION

330

30

322

Piping and wiring connections
can be made from 4 directions:
front, right, rear and below.

Rear Air Intake

600175 175

Installation Feet

Air Discharge

950

Earth terminal

4 PIPING-WIRING DIRECTIONS

2-U Shaped notched holes
(Foundation Bolt M10)

1928

417

370

37

56

4256

53

2-12 % 36 Oval holes
(Foundation Bolt M10)

Terminal connection

Left····Power supply wiring
Right··Indoor/Outdoor wiring

Handle for moving

Air intake

Piping Knockout Hole Details

Power supply wiring hole
(2-:27Knockout)

Front trunking hole
(Knockout)

Front piping hole
(Knockout)

92

:

40 45

92

5527

63

73

23

65

Right piping hole
(Knockout)

6373

9227

23

92

Handle for moving

Handle for moving

Power supply wiring hole
(2-:27Knockout)

Right trunking hole
(Knockout)

4075

:

92

5519

Service panel

1350

371 635

23

81 219

14514522030 145

4045

5527

637323

65

Power supply wiring hole
(2-:27Knockout)

Rear trunking hole
(Knockout)

:

92

92

Rear piping hole
(Knockout)

Drain hole
(5-:33)

Handle for moving

1

2

71

*1 423

71

Bottom piping hole
(Knockout)

1079

*1 507

Front piping cover

Rear piping cover

19

6-2. BRANCH BOX UNIT
PAC-AK50BC PAC-AK51BC

SUSPENSION BOLT : W3/8 (M10)

REFRIGERANT PIPE FLARED CONNECTION (inch)

ABCDE

LIQUID PIPE

GAS PIPE

1/4 1/4 1/4 1/4 1/4 3/8

3/8 3/8 3/8 3/8

DRAIN HOSE SIZE : O.D. 20 (VP-16)

TO OUTDOOR UNIT

1/2 5/8

SUSPENSION BOLT PITCH

320

unit : mm

402

SUSPENSION BOLT PITCH

24

12

E

D

450

TO INDOOR UNIT

DC

C

B

B

A

55

39

65

198

E

25 25 25 25 25

75 75 75 75

Type A

91

73

A

21

200

FLEXIBLE DRAIN HOSE
(ACCESSORY)

200

Type B

FLEXIBLE DRAIN HOSE
(ACCESSORY)

PAC-AK30BC PAC-AK31BC

SUSPENSION BOLT : W3/8 (M10)

REFRIGERANT PIPE FLARED CONNECTION (inch)

ABC

LIQUID PIPE

GAS PIPE

1/4 1/4 1/4 3/8

3/8 3/8 3/8

DRAIN HOSE SIZE : O.D. 20 (VP-16)

TO OUTDOOR UNIT

5/8

95 280

61

79

TO OUTDOOR UNIT

SERVICE PANEL
(for LEV, THERMISTOR)

23

DRAIN PIPE CONNECTION

:20

(VP-16)

DRAIN PIPE CONNECTION

:20

(VP-16)

SUSPENSION BOLT PITCH

39

50

34

320

3-ELECTRIC WIRE INLET

70

35

68

3-WIRE BAND

ELECTRIC COVER

402

TB3C

TB3E

TB3D

TB3ATB3B

TB2B

TERMINAL BLOCK
TO OUTDOOR UNIT

TERMINAL BLOCK
TO INDOOR UNIT

SUSPENSION BOLT PITCH

24

12

205

39

65

198

450

TO INDOOR UNIT

B

C

C

B

25 25 25

75 75

A

91

73

A

21

200

Type A

FLEXIBLE DRAIN HOSE
(ACCESSORY)

200

95

61

SERVICE PANEL

23

(for LEV, THERMISTOR)

DRAIN PIPE CONNECTION
(VP-16)

:20

280

79 50 34

TO OUTDOOR UNIT

39

3-ELECTRIC WIRE INLET

703568

3-WIRE BAND

ELECTRIC COVER

TB3C

TB3B TB3A

TB2B

TERMINAL BLOCK
TO OUTDOOR UNIT

TERMINAL BLOCK
TO INDOOR UNIT

Type B

FLEXIBLE DRAIN HOSE
(ACCESSORY)

DRAIN PIPE CONNECTION

:20

(VP-16)

20

7 WIRING DIAGRAM

1

C. B.

MF1

4567

CNF1

(WHT)

CN2

(WHT )

CN4

(WHT )

CN3S

(WHT )

CNDM

(WHT )

CN51

(WHT )

CNAC

(WHT)

TH7/6

(RED)

TH3

(WHT)

12 12

TH4

(WHT)

1234

63HS

(WHT)

123

63H

(YLW)

31

63L

(RED)

31

CNIT

(RED)

123 54

TH7TH6 TH3 TH4 63HS 63H 63L

1

MF2

4 567

CNF2

(WHT)

CNDC

(PNK)

CNS

(WHT)

31

321

52C

(BLK)

31

21S4

(GRN)

31

SV2

(BLU)

31

SV1

(GRY)

31

SS

(WHT)

31

FUSE2

FUSE1

FUSE3

FUSE4

21S4 SV2 SV1

12

34

7654321

54321 321

321

21

CNAF

(WHT )

CNDC

(PNK)

CN2

(WHT )

CN5

(RED)

7 6 5 4 321

21

CN3

(WHT)

21

CN4

(WHT)

21

6 54321

13

TH8

IGBT

LED1

DCL

TB1

NO FUSE

BREAKER

40 A

BRANCH

BOX

POWER SUPPLY

~/N

220/230/240V 50Hz

220V 60Hz

CE

L N S1 S2 S3

ACTM

RS

52C

SCR-N1

SCR-P1 SCR-R

SCR-P2

SCR-N2

SCR-S

N. F.

P. B.

MC

CNAC2

(RED)

31

CNAC1

(WHT)

31

LI

NI

L0 N0

CN5

(RED)

21

EI

W

V

U

P

N1

N2

I

654321

L1

L2

SW5

SW6SW1CN31

SW7SW2

SW8SW4

SW9SW10

7SEG LED

88

SYMBOL SYMBOL SYMBOLNAME NAME NAME

TB1MCMF1, MF2

21S4

SV1

SV2

63HS

63L

TH3

TH4

TH6

TH7

TH8

DCL

52CRSACTM

CE

P. B

63H

Terminal Block (Power Supply, Branch)

Motor for Compressor

Fan Motors

Solenoid Valve (Four-Way Valve)

Solenoid Valve (Hot Gas Bypass)

Solenoid Valve (Returning oil Bypass )

High pressure Sensor

High pressure Switch

Low pressure Switch

Thermistor (Outdoor Pipe)

Thermistor (Discharge)

Thermistor (Outdoor2 - Phase Pipe)

Thermistor (Outdoor)

Thermistor (Heatsink)

Reactor

52C Relay

Rush Current Protect Resistor

Active Filter Module

Main Smoothing Capacitor

Power Circuit Board

SC - R / S

SC - P1, P2

SC - N1, N2

CN2 ~ 5

CNDC

CNAF

IGBT

LED1

LI / LO

NI / NOEICNAC1 / 2

CN5

FUSE1 ~ 4

SW1

SW2

SW4

Screw Type Terminal (L / N - Phase)

Screw Type Terminal (DC Voltage)

Screw Type Terminal (DC Voltage)

Connector

Connector

Connector

Converter, Inverter

Light Emitting Diodes (Inverter Control Status)

Noise Filter Circuit Board

Connection Lead (L - Phase)

Connection Lead (N - Phase)

Connection Terminal (Ground)

Connector

Connector

Controller Circuit Board

Fuse (6. 3A)

Switch (Forced Defrost, Error History

Record Reset)

Switch (Self Diagnosis Switch)

Switch (Test Operation )

Connection Terminal (U / V / W - Phase)

U / V / W

SW5

Switch (Function Switch)

SW6

SW7

SW8

SW9

SW10

CN31

LED

CNAC

CNDC

CNS

CNF1

CNF2SSSV1

SV2

CN3S

CNDM

CN51

CNIT

Switch (Model Select)

Switch (Function Setup)

Switch

Switch (Function for option)

Switch (Function for option)

Connector

Light Emitting Diodes

(Operation Inspection Indicators)

Connector

Connector

Connector

Connector

Connector

Connector (Connection for Option)

Connector

Connector

Connector (Connection for Option)

Connector <Connected for Option

(Contact Input)>

Connector (Connection for Option)

Connector (Connection for Option)

N. F.

C. B.

Power turned on

Details

L WARNING: When the main supply is turned off, the voltage [340 V] in the main capacitor will drop to 20 V in approx.2 minutes

(input voltage : 240 V). When servicing, make sure that LED on the outdoor circuit board gose out, and then wait for at least 1 minute.

LComponents other than the outdoor board may be faulty : Check and take corrective action, referring to the service manual.

Do not replace the outdoor board without checking.

Cautions when Servicing

LED on the controller board display the operation and inspection status as follows.

If LED does not light, it indicates that no power is supplied to the board:

Operation / Inspection Display

Normal status

Faulty status

(blinking)

Code

(blinks)

Operation status display,

such as C5. H7

F3F9EA, Eb, EC

E6~E9

E0, E3~E5

EE, EFEdU2U7U1ULU6UFUHUPU3U4U5U8U9

PA

Connector (63H) open, connector (63L) open

At Ieast 2 connectors open

Incorrect wiring in indoor / outdoor unit connection

Indoor / outdoor unit communication error

Remote controller communication error

Combination error, undefined error

Serial communication error

Discharge temperature fault

Low-discharge superheating fault, Erroneous connection of refrigerant pipes or

the connecting wires

High pressure fault (63H operates)

Low pressure fault (63L operates)

Abnormality of power modules

Compressor overcurrent shutoff (Start up locked)

Current sensor fault (P. B.)

Compressor overcurrent shutoff fault

Discharge pipe/compressor thermistor (TH4) open or short-circuit

Outdoor unit thermistors (TH3, TH6, TH7, and TH8), 63HS, and branch box

thermistors open or short-circuit

Heatsink temperature fault

Abnormality in outdoor fan motor

Voltage fault, current sensor fault (N. F.)

Forced compressor stop

(Overlap malfunction of drain pump in indoor unit

and linear expansion valve in branch box)

WHT

BLK

BLK BLK

WHT

WHT

WHT

RED

RED

BLU

BLU

RED

RED

RED

YLW ORN

BRN

RED

GRN

/YLW

7-1. OUTDOOR UNIT
MXZ-8A140VA

21

MXZ-8A140VA1 MXZ-8A140VA2

Switch (Model Select)

Switch (Function Setup)

Switch

Switch (Function for option)

Switch (Function for option)

Connector

Light Emitting Diodes

(Operation Inspection Indicators)

Connector

Connector

Connector

Connector

Connector

Connector (Connection for Option)

Connector

Connector

Connector (Connection for Option)

Connector <Connected for Option

(Contact Input)>

Connector (Connection for Option)

SW6

SW7

SW8

SW9

SW10

CN31

LED

CNAC

CNDC

CNS

CNF1

CNF2SSSV1

SV2

CN3S

CNDM

CN51

Terminal (L / N - Phase)

Terminal (DC Voltage)

Terminal (DC Voltage)

Connector

Connector

Connector

Inverter

Light Emitting Diodes (Inverter Control Status)

Noise Filter Circuit Board

Connection Lead (L - Phase)

Connection Lead (N - Phase)

Connection Terminal (Ground)

Connector

Connector

Controller Circuit Board

Fuse (6.3A)

Switch (Forced Defrost, Error History

Record Reset)

Switch (Self Diagnosis Switch)

Switch (Test Operation )

Code

(blinks)

Connector (Connection for Option)

CNIT

Switch (Function Switch)

Details

Operation status display,

such as C5. H7

F3F5F9E8E9

EAEbEc

E0 E7

EE, EFEdU2U7U1ULU6UFUHUPU3U4U5U8U9

PA

TH7TH6 TH3 TH4 63HS 63H 63L

TAB-P/P1/P2

TAB-N/N1/N2

CN2 ~ 5

TAB - S / T

Terminal Block (Power Supply, Branch)

Motor for Compressor

Fan Motors

Solenoid Valve (Four-Way Valve)

SYMBOL SYMBOL SYMBOLNAME NAME NAME

TB1MCMF1, MF2

21S4

SW7SW2

SW6SW1CN31

SW5

CNIT

(RED)

12354

63L

31

(RED)

63H

31

(YLW)

123

63HS

(WHT)

1 23 4

TH4

(WHT)

TH3

(WHT)

TH7/6

1 212

(RED)

CNF1

(WHT)

4 5 6 7

1

C. B.

CNDC

CNAF

IPM

LED1

LI / LO

NI / NOEICNAC1 / 2

N. F.

Solenoid Valve (Hot Gas Bypass)

Solenoid Valve (Returning oil Bypass)

High pressure Sensor

High pressure Switch

Low pressure Switch

Thermistor (Outdoor Pipe)

Thermistor (Discharge)

Thermistor (Outdoor2 - Phase Pipe)

SV1

SV2

63HS

63L

TH3

TH4

TH6

63H

SW9SW10

SW8SW4

88

7SEG LED

CN4

CN2

CNF2

(WHT)

4 5 67

1

(PNK)

CNDC

CN5

FUSE1 ~ 4

SW1

C. B.

Thermistor (Outdoor)

Thermistor (Heatsink)

Reactor

52C Relay

Rush Current Protect Resistor

Active Filter Module

TH7

TH8

DCL

52CRSACTM

(WHT)
CNDM

3 2 1

(WHT)

CN3S

SS

SV1

2 1

(WHT)

(WHT)

7 654 321

SV2

21S4

52C

FUSE3

12

3 4

CNAC

(WHT)

FUSE2

31

CNS

SW5

SW2

SW4

Operation / Inspection Display

LED on the controller board display the operation and inspection status as follows.

Main Smoothing Capacitor

Power Circuit Board

CE

P. B

5 4321 321

(WHT)

CN51

3 1

(WHT)

31

(GRY)

3 1

(BLU)

3 1

(GRN)

31

(BLK)

If LED does not light, it indicates that no power is supplied to the board:

Connection Terminal (U / V / W - Phase)

U / V / W

SV2 SV1

21S4

FUSE4

FUSE1

321

(WHT)

63L connector (red) is open.

63H connector (yellow) is open.

Power turned on

Normal status

Faulty status

(blinking)

TH8

Miswiring of indoor-branch box/branch box-outdoor unit connecting wire (converse wiring or disconnection)

Startup time over

Communication error except for outdoor unit

Combination error, undefined error

Serial communication error

Discharge temperature fault

Low-discharge superheating fault, Erroneous connection of refrigerant pipes or

the connecting wires

High pressure fault (63H operates)

Low pressure fault (63L operates)

Abnormality of power modules

Compressor overcurrent shutoff (Start up locked)

Current sensor fault (P. B.)

Compressor overcurrent shutoff fault

Discharge pipe/compressor thermistor (TH4) open or short-circuit

Outdoor unit thermistors (TH3, TH6, TH7, and TH8), 63HS, and branch box

thermistors open or short-circuit

Heatsink temperature fault

2 connectors (63H/63L) are open.

Branch box/outdoor communication error (Signal receiving error) (Outdoor unit)

Indoor/branch box communication error (Signal receiving error) (Branch box)

Branch box/outdoor communication error (Transmitting error) (Outdoor unit)

Indoor/branch box communication error (Transmitting error) (Branch box)

Miswiring of indoor-branch box / branch box-outdoor unit connecting wire.

Too many indoor units / branch box are in the system.

(RED)

(WHT)

CNAC1

(RED)

CNAC2

LI

31

31

NI

EI

2 1

CN5

N. F.

L0 N0

Abnormality in outdoor fan motor

L N S1 S2 S3

TB1

P. B.

MC

RED

BLK

RED

WHT

V

IPM

U

W

TABP2

TABN2

TABN TABP

WHT

TABN1

TABS

TABT

7 654321

6 54321

2 1

2 1

21

CN2

(WHT)

CNAF

(WHT)

CN4

(WHT)

CN3

(WHT)

CN5

(RED)

(PNK)

CNDC

13

LED1

WHT

BLU

TABP1

Voltage fault, current sensor fault (N. F.)

Forced compressor stop

(Overlap malfunction of drain pump in indoor unit

and linear expansion valve in branch box)

Cautions when Servicing

WARNING: When the main supply is turned off, the voltage[340 V]in the main capacitor will drop to 20 V in approx.2 minutes

(input voltage : 240 V). When servicing, make sure that LED on the outdoor circuit board gose out, and then wait for at least 1 minute.

Components other than the outdoor board may be faulty : Check and take corrective action, referring to the service manual.

Do not replace the outdoor board without checking.

BRANCH

BOX

POWER SUPPLY

~/N

220/230/240V 50Hz

220V 60Hz

NO FUSE

BREAKER

40 A

WHT

RED

CE

DCL

P

6543 2 1

L2

L1

I

N1

N2

ACTMRS

52C

BLK BLK

MF1

MF2

22

MXZ-8A140VA3

Power turned on

LED on the controller board display the operation and inspection status as follows.

If LED does not light, it indicates that no power is supplied to the board:

Operation / Inspection Display

Normal status

Faulty status

(blinking)

Details

• WARNING:When the main supply is turned off, the voltage[340 V]in the main capacitor will drop to 20 V in approx.2 minutes

(input voltage : 240 V). When servicing, make sure that LED on the outdoor circuit board goes out, and then wait for at least

1 minute.

• Components other than the outdoor board may be faulty : Check and take corrective action, referring to the service manual.

Do not replace the outdoor board without checking.

Cautions when Servicing

Code

(blinks)

Operation status display,

such as C5. H7

F3F5F9E8E9

EAEbEc

E0 - E7

EE, EFEdU2U7U1ULU6UFUHUPU3U4U5U8U9

PA

63L connector (red) is open.

63H connector (yellow) is open.

2 connectors (63H/63L) are open.

Branch box/outdoor communication error (Signal receiving error)(Outdoor unit)

Indoor/branch box communication error (Signal receiving error)(Branch box)

Branch box/outdoor communication error (Transmitting error)(Outdoor unit)

Indoor/branch box communication error (Transmitting error)(Branch box)

· Miswiring of indoor-branch box / branch box-outdoor unit connecting wire.

· Too many indoor units / branch box are in the system.

Miswiring of indoor-branch box/branch box-outdoor unit connecting wire (converse wiring or disconnection)

Startup time over

Communication error except for outdoor unit

Combination errer, undefined error

Serial communication error

Discharge temperature fault

Low-discharge superheating fault, Erroneous connection of refrigerant pipes or

the connecting wires

High pressure fault (63H operates)

Low pressure fault (63L operates)

Abnormality of power modules

Compressor over current shutoff (Start up locked)

Current sensor fault (P. B.)

Compressor overcurrent shutoff fault

Discharge pipe/compressor thermistor (TH4) open or short-circuit

Outdoor unit thermistors (TH3, TH6, TH7, and TH8), 63HS, and branch dox

thermistors open or short-circuit

Heatsink temperature fault

Abnormality in outdoor fan motor

Voltage fault, current sensor fault (N. F.)

Forced compressor stop

(Overlap malfunction of drain pump in indoor unit

and linear expansion valve in branch box)

SYMBOL SYMBOL SYMBOLNAME NAME NAME

TB1MCMF1, MF2

21S4

SV1,SV2

63HS

63L

TH3

TH4

TH6

TH7

TH8

DCL

52C

ACTM

CB

P. B.

63H

Terminal Block

(Power Supply, Branch Box)

Motor for Compressor

Fan Motors

Solenoid Valve (Four-Way Valve)

Solenoid Valve (Bypass Valve )

High Pressure Sensor

High Pressure Switch

Low Pressure Switch

Thermistor(Outdoor Pipe)

Thermistor(Discharge)

Thermistor(Outdoor 2 - Phase Pipe)

Thermistor(Outdoor)

Thermistor(Radiator Panel)

Reactor

52C Relay

Active Filter Module

Main Smoothing Capacitor

Power Circuit Board

TAB S / T

TAB P1/ P2/ P

TABN1/N2/N

DS2, DS3

IPM

LI / LO

NI / NO

EI, E2

F1

~

F4

X51

~

X55

SW1

SW2

SW4

Connection Terminal (L / N - Phase)

Connection Terminal (DC Voltage)

Connection Terminal (DC Voltage)

Diode Bridge

Power Module

Noise Filter Circuit Board

Connection Terminal (L - Phase)

Connection Terminal (N - Phase)

Connection Terminal (Ground)

Controller Circuit Board

Fuse (T6.3AL250V)

Relay

Switch (Forced Defrost, Defect History

Record Reset)

Switch (Self Diagnosis Switch)

Switch (Test Operation )

Connection Terminal(U / V / W - Phase)

TABU / V / W

SW5

Switch (Function Switch)

SW6

SW7

SW8

SW9SSCN3S

CNIT

Switch (Model Select)

Switch (Function Setup)

Switch (Function Setup)

Switch (Function Setup)

CN31 Connector

LED

Light Emitting Diode

(Operation Inspection Indicators)

Connector(Connection for Option)

Connector(Connection for Option)

CNDM

Connector<Connected for Option

(Contact Input)>

CN51

Connector(Connection for Option)

Connector(Connection for Option)

N. F.

C. B.

MODEL

MXZ-8A140VA

SW6

ON

OFF

12345678

MS

3~

MF1

1

3

1

7

CNF1

(WHT)

TRANS

MS

3~

MF2

17

CNF2

(WHT)

CNDC

(PNK)

2

4

11221

TH7/6

(RED)

TH3

(WHT)

TH4

(WHT)

TH7

t° t° t° t°

TH6 TH3 TH4

3

1

63HS

63HS

(WHT)

63L

(RED)

31

63L

63H

(YLW)

31

63H

17

31

CNS

(WHT)

2

7

CN2

(WHT)

F3

12

1313

CNAC

(WHT)

CN4

(WHT)

1

2

3

4

F4

F2

F1

21S4

(GRN)

SV2

(BLU)

X52

X55

21S4 SV2

13

SV1

(GRY)

X54

SV1

13

SS

(WHT)

X51

114

CNM

(WHT)

LED1

12

2

CN52C

(RED)

1

5

CNIT

(RED)

1

5

CN51

(WHT)

1

3

CNDM

(WHT)

1

3
CN3S

(WHT)

SW8 SW5

SW1

CN31

SW6

SW9SW2 SW7

SW4

P. B.

7

1

12121

2

7

6

2

2

TABN

TABP

CN2

(WHT)

4

1

CNAF

(WHT)

CN4

(WHT)

CN5

(RED)

CN3

(WHT)

TH8

t°

WHT

RED

CB

C. B.

N. F.

BLU

S1NL

S2 S3

YLW

ORN

GRN / YLW

BRN

RED

TB1

NO FUSE

BREAKER

40 A

BRANCH BOX

POWER SUPPLY

~/N

220/230/240V 50Hz

220V 60Hz

DCL

ACTM

L1 L2

N2IoN1

P

4

16

RED

BLK

BLK

RED

WHT

WHT

IPM

TABV

TABW

TABN1

BLK

TABN 2

TABU

TABP 2

U

V

W

MC

RED

RED

WHT

WHT

BLK

MS

3~

1

3

2

CNDC

(PNK)

U

DS2

DS3

TABS

TABP 1

TABT

RED

BLU

WHT

WHT

LO

52C

NO

LI

NI

CN5

(RED)

CNAC2

(RED)

CNAC1

(WHT)

CN52C

(BLK)

2

2

1

3

E2

EI

U

U

1

2

1

2

3

1

BLU

The black square (■) indicates a switch position.

23

7-2. BRANCH BOX : PAC-AK50BC PAC-AK30BC

PAC-AK51BC PAC-AK31BC

Note : " PAC - AK30 . 50BC, PAC - AK31 . 51BC " is only for R410A.

SYMBOL

B.C

<

B.C

F1
SW1<B.C
CNM<B.C
LED1~5< B.C>
LEV-A~E
TH-A~E

TB2B
TB3A
TB3B
TB3C
TB3D
TB3E

Note

1. At servicing for outdoor unit, always follow the wiring diagram of Outdoor unit.

2. Symbols used in wiring diagram above are, : terminal block, : connector.
(Combination of indoor units)
Enter the location of combined indoor units with model name in each
blank below because it is necessary for service and maintenance.

Branch box controller board

>

Fuse 250V 6.3A

>

Switch for service

>

Connector
Light emitting diode
Linear expansion valve

Thermistor
Pipe temp.detection / Gas

(

0  / 15k, 25  / 5.4k

Terminal block / To outdoor unit
Terminal block / To indoor unit - A
Terminal block / To indoor unit - B
Terminal block / To indoor unit - C
Terminal block / To indoor unit - D
Terminal block / To indoor unit - E

NAME

)

Indoor unit - A Indoor unit - B Indoor unit - C Indoor unit - D Indoor unit - E

Setup of SW1
Make it the same setup as former
when exchanging PCB.

(PAC - AK50/51BC only)

TO INDOOR
UNIT -E

(PAC - AK50/51BC only)

TO INDOOR
UNIT -D

TO INDOOR
UNIT -C

TO INDOOR
UNIT -B

TO INDOOR
UNIT -A

TO OUTDOOR
UNIT

TB3E

S1
S2
S3

TB3D

S1
S2
S3

TB3C

S1
S2
S3

TB3B

S1
S2
S3

TB3A

S1
S2
S3

TB2B

S1
S2
S3

YLW
ORN
BRN

YLW
ORN
BRN

YLW
ORN
BRN

YLW
ORN
BRN

YLW
ORN
BRN

YLW
ORN
BRN

The black square (■) indicates a switch position.

ON

OFF

5
3
1

5
3
1

5
3
1

5
3
1

5
3
1

3
1

TB3E

(GRN)

TB3D
(BLK)

TB3C

(BLU)

TB3B

(RED)

TB3A

(WHT)

CND

(ORN)

TB1

SW1 

1

CN3C
(BLU)

3

LED1 LED2 LED3 LED4 LED5

1 234567
89

10 11 12 13 14

CNM

F1

TH-A

(WHT)

TH-B

(RED)

TH-C

(BLU)

TH-D

(BLK)

TH-E

(GRN)

LEV-A

(WHT)

LEV-B

(RED)

LEV-C

(BLU)

LEV-D

(BLK)

LEV-E
(GRN)

B.C

1
2

1
2

1
2

1
2

1
2

1
6

1
6

1
6

1
6

1
6

LEV-A

6

LEV-B

6

LEV-C

6

LEV-D

6

LEV-E

6

TH-A

TH-B

TH-C

TH-D

(

PAC - AK50/51BC only

TH-E

(PAC - AK50/51BC only)

)

24

8

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

REFRIGERANT SYSTEM DIAGRAM

MXZ-8A140VA MXZ-8A140VA1 MXZ-8A140VA2 MXZ-8A140VA3

Condenser / evaporator
temperature thermistor
(TH5 or RT12)

Room temperature
thermistor (TH1 or RT11)

E
D
C
B
A

Thermistor (TH-A~E)
(Gas pipe temperature)

LEV A~E

(Linear expansion valve)

Strainer
#100

4-way valve

Service port

Ball valve

Check valve
(Low Pressure)

Strainer
#100

Stop valve

Strainer
#50

Bypass valve(SV2)

Bypass valve (SV1)

Strainer
#100

Capillary
tube1

Capillary
tube2

Low
pressure
switch
63L

Check valve
(High Pressure)

High
pressure
switch
63H

Oil separator

Thermistor TH4
(Discharge temperature)

Thermistor TH8
(Fin temperature)

High pressure sensor
discharge pressure sensor
63HS

Thermistor TH7
(Outdoor temperature)

Thermistor TH6
(Pipe temperature : condenser)

Thermistor TH3
(Pipe temperature : liquid)

Distributor
with Strainer

Strainer
#100

Pipe temperature
thermistor / liquid
(TH2 or RT13)

Indoor units Branch box Outdoor unit

Capillary
tube4

Capillary
tube3

Capillary tube 1
(For return of oil
from oil separator)

MXZ-8A140VA

Outdoor unit

Branch box

MXZ-8A140VA1
MXZ-8A140VA2
MXZ-8A140VA3

PAC-AK50BC
PAC-AK51BC

PAC-AK30BC
PAC-AK31BC

:2.5 % :0.8 % L1000

Piping connection size

A

Liquid (mm)

{9.52

The pipe connection size differs according to the type and capacity of indoor units.
Match the piping connection size of branch box with indoor unit.
If the piping connection size of branch box does not match the piping connection size

Gas (mm)

{15.88

of indoor unit, use optional different-diameter (deformed) joints to the branch box side.
(Connect deformed joint directly to the branch box side.)

■ In case of using 1-branch box
Flare connection employed (No brazing)

Service port

Accumulator

Strainer
#100

Capillary tube 2
(For SV2)

:4 % :2.4 % L250

Compressor

Refrigerant flow in cooling
Refrigerant flow in heating

unit : mm

Capillary tube 3
ahead of LEV
(in cooling mode)

Capillary tube 4
behind LEV
(in cooling mode)

(:4 % :2.4 % L140) % 5(:4 % :2.2 % L130) % 5

(:4 % :2.4 % L140) % 3(:4 % :2.2 % L130) % 3

B

A

BB B BB

■ In case of using 2-branch boxes

2 branches pipe (joint)
: optional parts

A

A

A

BB

Branch box

Branch box #1

■ installation procedure (2 branch pipe (joint))
Refer to the installation manuals of
MSDD-50AR-E and MSDD-50BR-E.

BBB

Branch box #2

25

■ Pipe size (Branch box-Indoor unit) *Case of M series or S series Indoor unit

Indoor unit
type

Pipe size
(mm)

When using 60 type indoor unit of MEXZ series, use the flare nut in the indoor unit accessory for the gas side con­necting of indoor unit.
Do not use the flare nut (gas side) attached to the indoor unit. If it is used, a gas leakage or even a pipe extraction
may occur.

■ Pipe size (Branch box-Indoor unit) *Case of P series Indoor unit

Indoor unit
type

Pipe size
(mm)

When using 35, 50 type indoor unit of P series, use the flare nut (for R410A) attached to the indoor unit.
Do not use the flare nut (for R407C) in the indoor unit accessory. If it is used, a gas leakage or even a pipe
extraction may occur.

(kW)

Liquid

Gas

15

:6.35
:9.52

(kW)

Liquid

Gas

20

:6.35
:9.52

35

:6.35
:12.7

22

:6.35
:9.52

50

:6.35
:12.7

25

:6.35
:9.52

60

:9.52

:15.88

35

:6.35
:9.52

71

:9.52

:15.88

42

:6.35
:9.52

50

:6.35
:12.7

60

:6.35

:15.88 +

71

:9.52

:15.88

:15.88

(1) Valve size for outdoor unit

For liquid
For gas

:9.52 mm

:15.88 mm

80

:9.52

(2) Valve size for branch unit

+

 UNIT

+

 UNIT

+

 UNIT

 UNIT

 UNIT

+ 3- branch type is only for , , and  unit.

Liquid pipe
Gas pipe

Liquid pipe
Gas pipe

Liquid pipe
Gas pipe

Liquid pipe
Gas pipe

Liquid pipe
Gas pipe

Different-diameter joint (optional parts) (Fig.7-1)

Model name

MAC-A454JP
MAC-A455JP
MAC-A456JP
PAC-493PI
PAC-SG76RJ-E

Connected pipes diameter

mm

W9.52 © W12.7
W12.7 © W9.52
W12.7 © W15.88
W6.35 © W9.52
W9.52 © W15.88

Diameter AmmDiameter B

W9.52
W12.7
W12.7
W6.35
W9.52

W12.7

W9.52
W15.88
W9.52
W15.88

:6.35 mm
:9.52 mm

:6.35 mm
:9.52 mm
:6.35 mm

:9.52 mm
:6.35 mm
:9.52 mm
:6.35 mm
:12.7 mm

mm

Conversion formula

1/4 inch
3/8 inch

AB

Fig.7-1

1/2 inch
5/8 inch
3/4 inch

:6.35mm
:9.52mm

:12.7mm
:15.88mm
:19.05mm

26

9 TROUBLESHOOTING

9-1. TROUBLESHOOTING

<Error code display by self-diagnosis and actions to be taken for service (summary)>

Present and past error codes are logged and displayed on the wired remote controller and control board of outdoor unit.
Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the
table below. Check the contents below before investigating details.

Unit conditions at service

The trouble is reoccurring.

The trouble is not reoccurring.

Error code

Displayed

Not displayed

Logged

Not logged

Actions to be taken for service (summary)

Judge what is wrong and take a corrective action according
to “9-3. SELF-DIAGNOSIS ACTION TABLE”.

Conduct trouble shooting and ascertain the cause of the
trouble according to “9-4. TROUBLESHOOTING
BY INFERIOR PHENOMENA”.

Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise and etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the

trouble occurred, matters related to wiring and etc.

Reset error code logs and restart the unit after finishing
service.
There is no abnormality concerning of parts such as
electrical component, controller board, remote controller
and etc.

Re-check the abnormal symptom.
Conduct trouble shooting and ascertain the cause of the

trouble
BY INFERIOR PHENOMENA
Continue to operate unit for the time being if the cause
is not ascertained.
There is no abnormality concerning of parts such as
electrical component, controller board, remote controller
and etc.

according to “9-4. TROUBLESHOOTING

”.

27

9-2. CHECK POINTS FOR TEST RUN

9-2-1. Before test run

● Turn on the main power switch more than 12 hours before starting operation. Starting operation just after turning on the
power switch can severely damage the internal parts. Keep the main power switch turned on during the operation season.

● After completing installation and the wiring and piping of the indoor and outdoor units, check for refrigerant leakage, loose­ness in the power supply or control wiring, wrong polarity, and no disconnection of one phase in the supply.

● Use a 500-volt M-ohm tester to check that the resistance between the power supply terminals and ground is at least 1 M".

● Do not carry out this test on the control wiring (low voltage circuit) terminals.

Warning: Do not use the air conditioner if the insulation resistance is less than 1 M".

Insulation resistance

After installation or after the power source to the unit has been cut for an extended period, the insulation resistance will drop
below 1 M" due to refrigerant accumulating in the compressor. This is not a malfunction. Perform the following procedures.

1. Remove the wires from the compressor and measure the insulation resistance of the compressor.

2. If the insulation resistance is below 1 M", the compressor is faulty or the resistance dropped due to the accumulation of
refrigerant in the compressor.

3. After connecting the wires to the compressor, the compressor will start to warm up after power is supplied. After supplying
power for the times indicated below, measure the insulation resistance again.

• The insulation resistance drops due to accumulation of refrigerant in the compressor. The resistance will rise above 1M"

after the compressor is warmed up for 4 hours. (The time necessary to warm up the compressor varies according to
atmospheric conditions and refrigerant accumulation.)

• To operate the compressor with refrigerant accumulated in the compressor, the compressor must be warmed up at least 12

hours to prevent breakdown.

4. If the insulation resistance rises above 1 M", the compressor is not faulty.

Caution:

• The compressor will not operate unless the power supply phase connection is correct.

• Turn on the power at least 12 hours before starting operation.

Staring operation immediately after turning on the main power switch can result in severe damage to internal parts.
Keep the power switch turned on during the operational season.

● The followings must be checked as well.

• The outdoor unit is not faulty. LED on the control board of the outdoor unit flashes when the outdoor unit is faulty.

• Both the gas and liquid stop valves are completely open.

9-2-2. Test run
(1) Using remote controller

Refer to the indoor unit installation manual.

• Be sure to perform the test run for each indoor unit. Make sure each indoor unit operates properly following the installation
manual attached to the unit.

• If you perform the test run for all indoor units at once, you cannot detect any erroneous connection, if any, of the refrigerant
pipes and the connecting wires.
* The compressor operation is not available for 3 minutes at least after the power is supplied.

• The compressor can emit noise just after turn on the power supply or in case of low outside air temperature.

About the restart protective mechanism

Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect
the air conditioner.

28

(2) Using SW4 in outdoor unit

In case of the test run from outdoor unit, all indoor units operate. Therefore, you cannot detect any erroneous con­nection of refrigerant pipes and the connecting wires. If it aims at detection of any erroneous connection, be sure to
carry out the test run from remote controller with reference to "(1) Using remote controller."

SW4-1
SW4-2
SW4-1
SW4-2

+ After performing the test run, set SW4-1 to OFF.

• A few seconds after the compressor starts, a clanging noise may be heard from the inside of the outdoor unit. The noise is
coming from the check valve due to the small difference in pressure in the pipes. The unit is not faulty.

The test run operation mode cannot be changed by DIP switch SW4-2 during the test run. To change the test run
operation mode during the test run, stop the test run by DIP switch SW4-1. After changing the test run operation
mode, resume the test run by switch SW4-1.

ON
OFF
ON
ON

Cooling operation

Heating operation

When a test run is started by “Using SW4 in outdoor unit”, even if it carries out stop instructions by
remote controller, outdoor unit does not stop. A test run is not ended.
In this case, please set SW4 in outdoor unit to off.

• After power is supplied or after an operation stop for a while, a small clicking noise may be heard from the inside
of the branch box. The electronic expansion valve is opening and closing. The unit is not faulty.

NOTE: Be sure to wait at least 3 minutes after turning on the power supply before setting SW4-1and SW4-2.

If the DIP switches are set before 3 minutes has elapsed, the test run may not start.

9-2-3. Test run by outdoor unit SW4

The setting of test run (ON/OFF) and its operation mode (cooling/heating) can be set by SW4 on the controller board of out­door unit.

1 Set operation mode(cooling or heating) by SW4-2.
2 Start test run by setting SW4-1 to ON (
3 Finish test run by setting SW4-1 to OFF ( ).

• Operation mode cannot be changed by SW4-2 during test run.
Stop test run to change operation mode by SW4-1, and restart test run by SW4-1 after
the mode is changed.

• Test run automatically stops 2 hours later by 2-hour OFF timer function.

• Test run can be performed by the remote controller.

• The remote controller display of test run by outdoor unit is the same as that of test run by
remote controller.

• If test run is set with the outdoor unit, the test run is performed for all indoor units.

• The remote controller operation becomes unavailable once the test run is set with the outdoor unit.

) with the indicated operation mode of SW4-2.

ON

SW4



12





(Initial setting)

Stop
Cooling
Operation
Heating

During the test run set with the outdoor unit, operation on/off or operation mode change cannot be performed by the remote
controller, and the operation relating to the test run which is made with the outdoor unit will be prior to any other commands
from the remote controller. Set the SW4-1 to OFF ( ) to finish test run.
Emergency operation is not available for this model.

29

9-3. SELF-DIAGNOSIS ACTION TABLE

<Abnormalities detected when the power is put on>

Error Code

None —

Abnormal point and detection method

1 No voltage is supplied to termi-

2 Electric power is not charged to

3 Electric power is not supplied

(Note 1) Refer to indoor unit section for code P and code E.

Case

nal block (TB1) of outdoor unit.
a) Power supply breaker is

turned off.

b) Contact failure or disconnec-

tion of power supply terminal

c) Open phase (L or N phase)

power supply terminal of out­door power circuit board.
a) Contact failure of power

supply terminal

b) Open phase on the outdoor

power circuit board

Disconnection of connector

SC-R or SC-S

to outdoor controller circuit
board.
a) Disconnection of connector

(CNDC)

1 Check following items.

a) Power supply breaker
b) Connection of power supply terminal

(TB1)
c) Connection of power supply terminal

(TB1)

2 Check following items.

a) Connection of power supply terminal

(TB1)
b) Connection of terminal on outdoor

Disconnection of connector SC-R or
SC-S
Refer to 9-7.

3 Check connection of the connector (CNDC)

on the outdoor controller circuit board.

Check connection of the connector, CNDC

on the outdoor power circuit board.

Refer to 9-7.

Judgment and action

block.

block.

block.

power circuit board.

F3

(5202)

F5

(5201)

63L connector open

Abnormal if 63L connector circuit is open
for 3 minutes continuously after power sup­ply
63L: Low-pressure switch

63H connector open

Abnormal if 63H connector circuit is open
for 3 minutes continuously after power sup­ply
63H: High-pressure switch

4 Disconnection of reactor (DCL)

5 Disconnection of outdoor noise

filter circuit board or parts fail­ure in outdoor noise filter circuit
board

6 Defective outdoor power circuit

board

7 Defective outdoor controller
circuit board

1 Disconnection or contact failure

of 63L connector on outdoor
controller circuit board

2 Disconnection or contact failure

of 63L

3 63L is operating due to refriger-

ant leakage or defective parts.

4 Defective outdoor controller
circuit board

1 Disconnection or contact failure

of 63H connector on outdoor
controller circuit board

2 Disconnection or contact failure

of 63H

3 63H is operating due to defec-

tive parts.

4 Defective outdoor controller
circuit board

4 Check connection of reactor. (DCL)
Check connection of “L1” and “L2”
on the active filter module. (ACTM)

5 a) Check connection of outdoor noise filter
circuit board.
b) Replace outdoor noise filter circuit board.

Refer to 9-7.

6 Replace outdoor power circuit board.

7 Replace controller board (When items

above are checked but the units cannot be
repaired.)

1

Check connection of 63L connector on
outdoor controller circuit board.
Refer to 9-7.

2 Check the 63L side of connecting wire.

3 Check refrigerant pressure.

Charge additional refrigerant.
Check continuity by tester.
Replace the parts if the parts are defective.

4 Replace outdoor controller circuit board.

1 Check connection of 63H connector on

outdoor controller circuit board.
Refer to 9-7.

2 Check the 63H side of connecting wire.

3 Check continuity by tester.

Replace the parts if the parts are defective.
4 Replace outdoor controller circuit board.

F9

(4119)

2 connector open

Abnormal if both 63H and 63L connector
circuits are open for 3 minutes continuously
after power supply

63H: High-pressure switch
63L: Low-pressure switch

1 Disconnection or contact failure

of connector (63H, 63L) on

outdoor controller circuit board.
2 Disconnection or contact failure

of 63H, 63L

3 63H and 63L are operating due

to defective parts.

4 Defective outdoor controller

board

30

1 Check connection of connector (63H,63L) on
outdoor controller circuit board.
Refer to 9-7.
2 Check the 63H and 63L side of connecting

wire.

3 Check continuity by tester.
Replace the parts if the parts are defective.
4 Replace outdoor controller circuit board.