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.]

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

MXZ-8A140VA2 MXZ-8A140VA3

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

1.0

—

(mm)

0.8

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

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-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

500

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

150

2000

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

+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

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

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)

: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

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

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

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

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

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)

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

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)

Connector

Light Emitting Diodes

(Operation Inspection Indicators)

Connector

Connector (Connection for Option)

Connector

Connector (Connection for Option)

Connector <Connected for Option

(Contact Input)>

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

RED

BLU

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)

Connector

Light Emitting Diodes

(Operation Inspection Indicators)

Connector

Connector (Connection for Option)

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)

Connector

Inverter

Light Emitting Diodes (Inverter Control Status)

Noise Filter Circuit Board

Connection Lead (L - Phase)

Connection Lead (N - Phase)

Connection Terminal (Ground)

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)

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

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

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)

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)

CN31 Connector

LED

Light Emitting Diode

(Operation Inspection Indicators)

Connector(Connection for Option)

CNDM

Connector<Connected for Option

(Contact Input)>

CN51

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

(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

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

RED

WHT

IPM

TABV

TABW

TABN1

BLK

TABN 2

TABU

TABP 2

U

V

W

MC

RED

WHT

BLK

MS

3~

1

3

2

CNDC

(PNK)

U

DS2

DS3

TABS

TABP 1

TABT

RED

BLU

WHT

LO

52C

NO

LI

NI

CN5

(RED)

CNAC2

(RED)

CNAC1

(WHT)

CN52C

(BLK)

2

1

3

E2

EI

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

The black square (■) indicates a switch position.

ON

OFF

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 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

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

(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

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

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

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.

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.

Error Code

EA

(6844)

Eb

(6845)

Abnormal point and detection method

Indoor–branch box/branch box–outdoor unit connector miswiring, excessive number of units

Outdoor/branch box controller circuit board can automatically check the number of connected indoor units. Abnormal if the number cannot be checked automatically due to miswiring of indoor– branch box/ branch box–outdoor unit connecting wire and etc. after power is turned on for 4 minutes.

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

Outdoor/branch box controller circuit board can automatically set the unit number of indoor units. Abnormal if the indoor unit number can not be set within 4 minutes after power on because of miswiring (converse wiring or disconnection) of indoor–branch box/ branch box–outdoor unit connecting wire.

Case

1 Contact failure or miswiring of

indoor/outdoor unit connecting wire

2 Diameter or length of indoor– branch box/branch box–out-

door unit connecting wire is out of specified capacity.

There are 9 or more indoor

units in the system.

There are 3 or more branch

boxes in the system.

3 Defective transmitting receiving

circuit of outdoor/branch box controller circuit board

4 Defective transmitting receiv-

ing circuit of branch box/indoor controller board

5 Defective branch box/indoor

power board

6 Noise has entered into power

supply or indoor–branch box/ branch box–outdoor unit connecting wire.

1 Contact failure or miswiring of

indoor–branch box/branch box

–outdoor unit connecting wire 2 Diameter or length of indoor– branch box/branch box–out-

door unit connecting wire is out of specified capacity.

4 Defective transmitting receiving

circuit of outdoor/branch box controller circuit board

5 Defective transmitting receiv-

ing circuit of indoor/branch box controller board

6 Defective indoor/branch box

power board

7 Noise has entered into power

supply or indoor –branch box/ branch box–outdoor unit connecting wire.

Judgment and action

1 Check disconnection or looseness or polar-

ity of indoor –branch box/branch box–outdoor unit connecting wire of indoor and outdoor units.

2 Check diameter and length of indoor–branch

box/branch box –outdoor unit connecting wire. Total wiring length: 55 m (outdoor–branch box) (including wiring connecting each branch box

unit and between branch box and outdoor

unit) Also check if the connection order of flat

cable is S1, S2, S3.

If the error “EA” is detected, check the

number of the indoor units and the branch

box in the system.

3~5 Turn the power off once, and on again to

check. Replace outdoor controller circuit board, branch box controller board, indoor controller board or indoor power board if abnormality occurs again.

6 Check transmission path, and remove the

cause.

w The descriptions above, 1-6, are for EA, Eb

and EC.

EC

(6846)

Start-up time over

The unit cannot finish start-up process within 4 minutes after power on.

1 Contact failure of indoor– branch box/branch box–outdoor

unit connecting wire

2 Diameter or length of indoor– branch box/branch box–outdoor

unit connecting wire is

out of specified capacity. 3 Noise has entered into power

supply or indoor–branch box/ branch box–outdoor unit connecting wire.

31

Error Code

U1

(1302)

Abnormal point and detection method

(1) High-pressure switch (63H) operated

Abnormal if high-pressure switch 63H operated ( w ) during compressor operation. w 4.15 MPa

63H: High-pressure switch

(2) High pressure

(High - pressure sensor 63HS detect) 1 When high-pressure sensor

detects 4.31MPa or more (or over

4.15MPa for 3 minutes) (1st detection) during the compressor operation, the compressor stops and restarts opera tion in 3 minutes. 2 When the sensor detects 4.31MPa or

more (or over 4.15MPa for 3 minutes) again (2nd detection) within 30 minutes since the compressor has stopped, the compressor stops again and restarts operation in 3 minutes.

3 When the sensor detects 4.31MPa or

more (or over 4.15MPa for 3 minutes) again (3rd detection) within 30 minutes since the compressor has stopped, the compressor stops again and restarts operation in 3 minutes.

4 When the sensor detects 4.31MPa or

more (or over 4.15MPa for 3 minutes) again (4th detection) within 30 minutes after 3rd compressor stop, it stops abnormally. In this time <U1> is displayed.

5 When the sensor detects 4.31MPa or

more (or over 4.15MPa for 3 minutes) after 30 minutes since the compressor has stopped (1st or 2nd or 3rd time), it becomes the 1st detection or the same performance as above-mentioned 1.

6 It is being delay for abnormal stop during

30 minutes since the compressor has stopped. In this time, check delay code <U1> will be displayed.

Case

1) Short cycle of indoor unit

2) Clogged filter of indoor unit

3) Decreased airflow caused by dirt of indoor fan

4) Dirt of indoor heat exchanger

5) Locked indoor fan motor

6) Malfunction of indoor fan motor

7) Defective operation of stop valve (Not fully opened)

8) Clogged or broken pipe

9) Locked outdoor fan motor

10) Malfunction of outdoor fan

motor

11) Short cycle of outdoor unit

12) Dirt of outdoor heat exchang-

er

13) Decreased airflow caused by

defective inspection of out side temperature thermistor

(It detects lower temperature

than actual temperature.)

14) Disconnection or contact

failure of connector (63H) on outdoor controller board

15) Disconnection or contact fail-

ure of 63H connection

16) Defective outdoor controller

board

17) Defective action of linear

expansion valve

18) Malfunction of fan driving cir-

cuit

19) Solenoid valve (SV1) per-

formance failure (Highpressure cannot be controlled by SV1)

20) High-pressure sensor defec-

tive

21) High-pressure sensor input

circuit defective in multi controller board

Judgment and action

1)~6) Check indoor unit and repair defect.

7) Check if stop valve is fully open.

8) Check piping and repair defectives.

9)~12) Check outdoor unit and repair defect.

13) Check the detected temperature of outside temperature thermistor on LED display.

14)~16) Put the power off and check F5 is displayed when the power is put again. When F5 is displayed, refer to “Judgment and action” for F5.

17) Check linear expansion valve. Refer to 9-6.

18) Replace outdoor controller board.

19) Check the solenoid valve performance.

20) Check the high-pressure sensor.

21) Check the high-pressure sensor.

32

Error Code

Abnormal point and detection method Judgment and action

(1) High discharging temperature

Abnormal if discharge temperature ther-

mistor (TH4) exceeds 125: or 110: continuously for 5 minutes.

Abnormal if pressure detected by high

pressure sensor and converted to saturation temperature exceeds 40: during defrosting and discharge temperature thermistor (TH4) exceeds 110:.

1 Overheated compressor opera-

tion caused by shortage of refrigerant

2 Defective operation of stop

valve

3 Defective thermistor 4 Defective outdoor controller

board

5 Defective action of linear

expansion valve

Case

1 Check intake superheat. Check leakage of refrigerant. Charge additional refrigerant.

2 Check if stop valve is fully open. 34 Turn the power off and check if U3 is dis-

played when the power is turned on again.

When U3 is displayed, refer to “Judgement

and action” for U3.

5 Check linear expansion valve. Refer to 9-6.

U2

(1102)

(2) Refrigerant shortage abnormality

1 When the conditions of below detecting

mode 1 or 2 are satisfied (1st detection) during the compressor operation, the compressor stops and restarts operation in 3 minutes.

<Detecting mode 1> When the below conditions are satisfied

completely.

1. Compressor is operating in HEAT mode.

2. Discharge superheat is 70; or more.

3. Difference of outer temperature thermistor (TH7) and outdoor piping temp. thermistor (TH3) applies to the formula of (TH7-TH3)<5;.

4. High-pressure sensor is below about

2.04MPa.

When the below conditions are satisfied

completely.

1. Compressor is operating.

2. When cooling, discharge superheat

is 80; or more.

When heating, discharge superheat

is 90; or more.

High pressure sensor is below about

2.32MPa.

2 When the conditions of detecting mode

1and 2 are satisfied again (2nd detection) within 30 minutes since the compressor has stopped, it stops abnormally. In this time, <U2> is displayed.

3 When the conditions of detecting

mode1and 2are satisfied again after 30 minutes since the compressor has stopped (1st time), it becomes the 1st detection and same performance as above 1.

4 It is being delay for abnormal stop dur-

ing 30 minutes since the compressor has stopped. In this time, check delay code <U2> will be displayed.

1 Gas leakage, Gas shortage 2 When heating operation, scant

refrigerant operation

(When heating, airflow or ther-

mo OFF are mixed-operation, it cause a refrigerant shortage operation.)

3 Ball valve performance failure

(Not fully opened.)

4 Error detection of discharge

super heat

1) High-pressure sensor defective

2) Discharge temperature thermistor defective

3) Thermistor input circuit defective and high-pressure sensor defective in multi controller board

5 Error detection of TH7/TH3

1) Thermistor defective

2) Thermistor input circuit

defective in multi controller board

1 Check the refrigerant amount. 2 Check the operation condition and refrigerant

amount.

3 Check the ball valve is fully opened.

4 1) Check the ball valve is fully opened.

2) Check the resistance of discharge temperature thermistor.

3) According to “Monitoring function for outdoor unit”, set the SW2 and check the high-pressure sensor level.

According to “Monitoring function for outdoor

unit”, set the SW2 and check the discharge temp. thermistor level.

When the high-pressure sensor and dis-

charge temp. thermistor are normal, if the above mentioned detecting pressure level and temp. are big different from the actual pressure and temp., replace the multi controller board.

5 1) Check the resistance of thermistor.

2) According to “Monitoring function for outdoor unit”, set the SW2 and check the outdoor pipe temp. thermistor level.

3) According to “Monitoring function for outdoor unit”, set the SW2 and check the outer temp. thermistor level.

U3

(5104)

Open/short circuit of discharge temperature thermistor (TH4)

Abnormal if open (3: or less) or short (217: or more) is detected during compressor operation. (Detection is inoperative for 10 minutes of compressor starting process and for 10 minutes after and during defrosting.)

1 Disconnection or contact failure

of connector (TH4) on the outdoor controller circuit board

2 Defective thermistor

3 Defective outdoor controller

circuit board

33

1 Check connection of connector (TH4) on the outdoor controller circuit board. Check breaking of the lead wire for thermistor

(TH4). Refer to 9-6.

2 Check resistance value of thermistor (TH4)or

temperature by microprocessor. (Thermistor/TH4: Refer to 9-6.) (SW2 on A-Control Service Tool: Refer to 9-8.) 3 Replace outdoor controller board.

Error Code

Abnormal point and detection method

(1) Open/short circuit in the outdoor unit

thermistors (TH3, TH7, and TH8) and branch box’s thermistors (TH-A~E)

Abnormal if open or short circuit is detected while the compressor is operating. Open detection of thermistors TH3 is inoperative for 10 seconds to 10 minutes after compressor starting and 10 minutes after and during defrosting. WCheck which unit has abnormality in its

thermistor by switching the mode of SW2. (Refer to 9-8.) Open/short circuit in the branch box thermistor. (TH-A–TH-E)

Case

1One or more connectors on

outdoor controller circuit board (TH3, TH7 and TH8) and branch box controller board (TH-A~E) have contact failure or disconnection.

2Defective thermistor

3Outdoor controller circuit board

is defective.

Judgment and action

1 Check the connector’s contact and the electric

wires of thermistor.

2Check the resistance value of thermistors or

the temperatures by referring to the section of “Monitoring function for outdoor unit”.

(Convert modes by SW2.) 3Replace the whole outdoor controller board.

Symbol

TH3

U4 (TH3:5105) (TH7:5106) (TH8:5110)

(63HS:5201)

TH-A~E

()

:5131

U5

(4230)

U6

(4250)

TH7 TH8

Branch box unit

TH-A~E

(Room A-E)

(2) High-Pressure sensor (63HS) abnormality

1 When detected pressure in high-pressure

sensor is 1MPa or less during the operation, the compressor stops and restarts operation in 3 minutes.

2 When the detected pressure is 1MPa or

less at just before of restarting, the compressor stops abnormally. In this time, <U4> is displayed.

3 For 3 minutes after the compressor

stops, the unit delays to abnormal stop. Then, the outdoor unit address No. and check delay code <U4> blinks alternately on the 7 SEG digital display.

4 For 3 minutes after starting compres-

sor, for defrosting or for 3 minutes after recovery from defrosting, abnormality is not determined as abnormality.

Abnormal temperature of heatsink

Abnormal if heatsink thermistor (TH8) detects temperature indicated 85:

Abnormality of power module

Check abnormality by driving power module in case overcurrent is detected. (UF or UP error condition)

Thermistors

Name Thermistor <Outdoor pipe> Thermistor <Outdoor> Thermistor <Heatsink>

Thermistor (Gas pipe temperature detection)

Open detection Short detection

– 40 or below – 40 or below – 27 or below

– 40 or below 90 or above

1 High-pressure sensor failure

2 Internal pressure decrease by

gas leakage

3 Connector contact failure dis-

connection

4 Controller board input circuit

failure

1

The outdoor fan motor is locked

2 Failure of outdoor fan motor 3 Air flow path is clogged. 4 Rise of ambient temperature

5 Defective thermistor

6 Defective input circuit of

outdoor power circuit board 7 Failure of outdoor fan drive circuit

1 Outdoor stop valve is closed. 2 Decrease of power supply voltage 3 Looseness, disconnection or

converse of compressor wiring connection

4 Defective compressor 5 Defective outdoor power circuit

board

90 or above 90 or above

102 or above

1 Check the high-pressure sensor.

2 Check the internal pressure.

3 Check the high-pressure sensor.

4 Check the controller board

.

12 Check outdoor fan.

3 Check air flow path for cooling. 4 Check if there is something which causes

temperature rise around outdoor unit. (Upper limit of ambient temperature is 46:.) Turn off power, and on again to check if U5 is displayed within 30 minutes. If U4 is displayed instead of U5, follow the action to be taken for U4.

5 Check resistance value of thermistor (TH8)

or temperature by microprocessor. (Thermistor/TH8: Refer to 9-6.) (SW2 on A-Control Service Tool: Refer to 9-8.)

6 Replace outdoor power circuit board.

7 Replace outdoor controller circuit board.

1 Open stop valve. 2 Check facility of power supply. 3 Correct the wiring (U·V·W phase) to

compressor. Refer to 9-7.

4 Check compressor referring to 9-6. 5 Replace outdoor power circuit board.

34

Error Code

Abnormal point and detection method

(1) Too low superheat due to low dis-

charge temperature

Abnormal if discharge superheat is continuously detected -15: or less even though linear expansion valve has minimum open pulse after compressor starts operating for 10 minutes.

Case

1 Disconnection or loose connection of discharge temperature thermistor. (TH4) 2 Defective holder of discharge

temperature thermistor

Judgment and action

12 Check the installation conditions of discharge temperature thermistor (TH4).

U7

(1520)

U8

(4400)

U9

(4220)

(2) Erroneous connection of refrigerant

pipes or the connecting wires

Consider the stopping indoor unit abnormal if condenser/evaporator temperature thermistor (TH5 or RT12) detects -5: or below continuously for 5 minutes during a compressor’s operation in cooling mode.

Outdoor fan motor

The outdoor fan motor is considered to be abnormal if the rotational frequency of fan motor is abnormal when detected during operation. Fan motor rotational frequency is abnormal if;

• 100 rpm or below detected continuously

for 15 seconds at 26: or more outside air temperature

• 50 rpm or below or 1500 rpm or more detected continuously for 1 minute.

Overvoltage or voltage shortage and abnormal synchronous signal to main circuit

Abnormal if any of followings are detected during compressor operation;

• Decrease of DC bus voltage to 310V

• Instantaneous decrease of DC bus voltage

to 200V

• Increase of DC bus voltage to 400V

• Decrease of input current of outdoor unit

to 0.5A only if operation frequency is more than or equal to 40Hz or compressor current is more than or equal to 5A.

1 Failure in piping/wiring

2 Pipe (liquid) is clogged or

crushed.

1 Failure in the operation of

the DC fan motor

2 Failure in the outdoor circuit

controller board

1 Decrease of power supply voltage 2 Disconnection of compressor

wiring

3 Defective 52C

4 Defective ACT module 5 Defective ACT module drive

circuit of outdoor power circuit board

6 Disconnection or loose connec-

tion of CNAF

7 Defective 52C drive circuit of

outdoor controller circuit board

8 Disconnection or loose connection of CN5 on the outdoor power circuit board 9 Disconnection or loose connection of CN2 on the outdoor power circuit board

1 Check piping/wiring between branch box and

indoor unit.

Refer to “Test run (Using remote controller)”. 2 Check the pipe for refrigerant and change

the wrong parts.

1 Check or replace the DC fan motor.

2 Check the voltage of the outdoor circuit

controller board during operation.

3 Replace the outdoor circuit controller

board. (when the failure is still indicated even after performing the remedy 1 above.)

1 Check the facility of power supply. 2 Correct the wiring (U·V·W phase) to com-

pressor. Refer to 9-7.

3 Replace 52C. (VA/VA Replace noise filter circuit board. (VA3)

4 Replace ACT module. 5 Replace outdoor power circuit board.

6 Check CNAF wiring.

7 Replace outdoor controller circuit board.

(220-240VAC output : VA/VA (12V DC output : VA3) 8 Check CN5 wiring on the outdoor power circuit board. Refer to 9-7. 9 Check CN2 wiring on the outdoor power circuit board. Refer to 9-7.

1/VA2)

UF

(4100)

Compressor overcurrent interruption (When compressor locked)

Abnormal if overcurrent of DC bus or compressor is detected within 30 seconds after compressor starts operating.

1 Stop valve is closed. 2 Decrease of power supply

voltage 3 Looseness, disconnection or converse of compressor wiring connection

4 Defective compressor

5 Defective outdoor power board

35

1 Open stop valve. 2 Check facility of power supply.

3 Correct the wiring (U·V·W phase) to

compressor. Refer to 9-7. 4 Check compressor. Refer to 9-6. 5 Replace outdoor power circuit board.

Error Code

UH

(5300)

UL

(1300)

Abnormal point and detection method

Current sensor error

Abnormal if current sensor detects –1.5A to 1.5A during compressor operation. (This error is ignored in case of test run mode.)

Abnormal if input current exceeds 38 A or 34A continuously 10 seconds. (Current sensor on noise filter board detects input current)

Low pressure (63L worked)

Abnormal if 63L is operated (under-

0.03MPa) during compressor operation. 63L: Low-pressure switch

Case

1 Disconnection of compressor

wiring

2 Defective circuit of current

sensor on outdoor power circuit board

1 Decrease of power supply volt-

age

1 Stop valve of outdoor unit is

closed during operation.

2 Disconnection or loose con-

nection of connector (63L) on outdoor controller board

3 Disconnection or loose connec-

tion of 63L

4 Defective outdoor controller board 5

Leakage or shortage of refrigerant

6 Malfunction of linear expansion

valve

Judgment and action

1 Correct the wiring (U·V·W phase) to com-

pressor. Refer to 9-7.

2 Replace outdoor power circuit board.

1 Check the facility of power supply.

1 Check stop valve.

2~4 Turn the power off and on again to check

if F3 is displayed on restarting.

If F3 is displayed, follow the F3 process-

ing direction.

5 Correct to proper amount of refrigerant. 6 Check linear expansion valve. Refer to 9-6.

UP

(4210)

E0

(No display)

E3

(No display)

Compressor overcurrent interruption

Abnormal if overcurrent DC bus or compressor is detected after compressor starts operating for 30 seconds.

Remote controller communication error (Signal receiving error)

(1) Abnormal if any signal from IC of

refrigerant address “0” could not be normally received for 3 minutes.

(2) Abnormal if sub remote controller could

not receive any signal for 2 minutes.

Remote controller communication error (Transmitting error)

(1) Abnormal if sub remote controller could

not find blank of transmission path for 6 seconds.

(2) Abnormal if remote controller could not

finish transmitting 30 times continuously.

1 Stop valve of outdoor unit is

closed.

2 Decrease of power supply volt-

age

3 Looseness, disconnection or

converse of compressor wiring connection

4 Defective fan of indoor/outdoor

units

5 Short cycle of indoor/outdoor

units

6 Defective input circuit of out-

door controller board

7 Defective compressor

1 Defective communication circuit

of remote controller

2 Defective communication circuit

of indoor controller board of refrigerant address “0”

3 Noise has entered into transmis-

sion line of remote controller.

4 All remote controllers are set

as “sub” remote controller. In this case, E4 is displayed at outdoor LED, and E0 is displayed at remote controller.

1 Defective communication circuit

of remote controller

2 Noise has entered into trans-

mission line of remote controller.

3 Two remote controllers are set

as "main."

(In case of 2 remote controllers)

1 Open stop valve. 2 Check facility of power supply. 3 Correct the wiring (U·V·W phase) to com-

pressor. Refer to 9-7.

4 Check indoor/outdoor fan. 5 Solve short cycle. 6 Replace outdoor controller circuit board. 7 Check compressor. Refer to 9-6.

W

Before the replacement of the outdoor con-

troller circuit board, disconnect the wiring for compressor from the outdoor power circuit board and check the output voltage among phases, U, V, W, during test run. No defect on board if voltage among phases (U-V, V-W and W-U) is same. Make sure to perform the voltage check with same performing frequency.

1~3 Diagnose remote controller. Take actions as follows according to

diagnosis result.

a) When “RC OK” is displayed,

remote controllers have no problem. Turn the power off, and on again to check. If, “PLEASE WAIT” or “H0” is displayed for 4 minutes or more, replace indoor controller board.

b) When “RC NG” is displayed,

replace remote controller.

c) When “RC E3” or “ERC 00-66” is dis-

played, noise may be causing abnor-

4 Set a remote controller to main, and the other

w The descriptions above, 1-3, are for E0 and

mality.

to sub.

E3.

E8

(6840)

Indoor - branch box/branch box outdoor unit communication error (Signal receiving error) (Branch box/outdoor unit)

(1) Abnormal if branch box/outdoor control-

ler circuit board could not receive anything normally for 3 minutes.

1 Contact failure of indoor/out-

door unit connecting wire

2 Defective communication circuit

of branch box/outdoor controller circuit board

3 Defective communication circuit

of indoor/branch box controller board

4 Noise has entered into indoor–

branch box/branch box–

outdoor unit connecting wire.

36

1 Check disconnection or looseness of indoor–

branch box/branch box –outdoor unit

connecting wire of indoor or branch box or

outdoor units.

2~4 Turn the power off, and on again to

check. Replace indoor controller board or branch controller board or outdoor controller circuit board if abnormality is displayed again.

Error Code

E9

(6841)

Abnormal point and detection method Judgment and action

Indoor - branch box/branch box outdoor unit communication error (Transmitting error) (Branch box/outdoor unit)

(1) Abnormal if “0” receiving is detected 30

times continuously though branch box/

outdoor controller circuit board has

transmitted “1”.

(2) Abnormal if branch box/outdoor control-

ler circuit board could not find blank of transmission path for 3 minutes.

1 Indoor–branch box/ branch box–outdoor unit con-

necting wire has contact failure.

2 Defective communication cir-

cuit of outdoor controller circuit board

3 Noise has entered power sup-

ply.

4 Noise has entered Indoor– branch box/branch box– outdoor unit connecting wire.

Case

1 Check disconnection or looseness of indoor–

branch box/branch box–outdoor unit connecting wire.

2~4 Turn the power off, and on again to

check. Replace outdoor controller circuit board if abnormality is displayed again.

EF

(6607

or

6608)

Ed

(0403)

Non defined error code

This code is displayed when non defined error code is received.

Serial communication error

1. Abnormal if serial communication between outdoor controller circuit board and outdoor power circuit board is defective.

Forced compressor stop.

(Overlap malfunction of drain pump in indoor unit and linear expansion valve in branch box.)

1 Noise has entered transmission

wire of remote controller.

2 Noise has entered Indoor– branch box/branch box– outdoor unit connecting wire. 3 Model name of remote control-

ler is PAR-S25A.

1 Breaking of wire or contact fail-

ure of connector CN2 between the outdoor controller circuit board and the outdoor power circuit board

2 Breaking of wire or contact fail-

ure of connector CN4 between the outdoor controller circuit board and the outdoor power circuit board

3 Defective communication circuit

of outdoor power circuit board

4 Defective communication circuit

of outdoor controller circuit board for outdoor power circuit board

1 Drain pump trouble

2 Drain defective

· Drain pump clogging

· Drain pipe clogging

12 Turn the power off, and on again to check. Replace indoor controller board or branch

controller board or outdoor controller circuit

board if abnormality is displayed again.

3 Replace remote controller with MA remote

controller.

12 Check connection of each connector CN2

and CN4 between the outdoor controller circuit board and the outdoor power circuit board.

3 Replace outdoor power circuit board.

4 Replace outdoor controller circuit board.

1 Check the drain pump.

Performance 2 Please confirm whether water can be

drained.

PA

(2520)

When condition of the outdoor unit is forcefully stopped, which means the drain sensor detects continuously to go under water 5 times, and also detects "[liquid pipe temperature – suction temperature] [ – 10deg" for 30 minutes continuously, the indoor unit and indoor units in same refrigerant system which operates in cooling, heating or dry mode stops abnormally. Also, the outdoor unit which is connected to that indoor unit with refrigerant system stops abnormally (compressor is suspended to operate). In this time, <PA> is displayed.

3 Open circuit of drain sensor

side heater

4 Contact failure of drain sensor

connector

5 Dew condensation on drain

sensor

· Drain water descends along lead wire.

· Drain water waving due to filter clogging

Indoor controller board defective

6

· Drain pump drive circuit failure

· Drain heater output circuit failure

7 Both of above mentioned 1~6

and the linear expansion valve full closed failure happens synchronistically.

3 Confirm the resistance of the drain sensor

side heater.

4 Check the connector contact failure.

5 Check the drain sensor leadwire mounted.

Check the filter clogging.

6 If the above mentioned checkpoints has any

problem, replace the indoor controller board.

7 Check whether the indoor linear expansion

valve leaks or not.

37

9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA

Phenomena

1. Remote controller display operates normally and the unit performs cooling operation, however, the capacity cannot be fully obtained. (The air does not cool well.)

2. Remote controller display operates normally and the unit performs heating operation, however, the capacity cannot be fully obtained.

Factor

1 Refrigerant shortage

2 Filter clogging

3 Heat exchanger clogging

4 Air duct short cycle

1 Linear expansion valve fault

Opening cannot be adjusted well due to linear expansion valve fault.

2 Refrigerant shortage

3 Lack of insulation for refrigerant piping 4 Filter clogging

5 Heat exchanger clogging

6 Air duct short cycle 7 Bypass circuit of outdoor unit fault

Countermeasure

1 If refrigerant leaks, discharging tempera-

ture rises and LEV opening increases. Inspect leakage by checking the temperature and opening.

Check pipe connections for gas leakage. 2 Open intake grille and check the filter.

Clean the filter by removing dirt or dust on it.

3 If the filter is clogged, indoor pipe tem-

perature rises and discharging pressure increases. Check if heat exchanger is clogged by inspecting discharging pressure.

Clean the heat exchanger.

4 Remove the blockage.

1 Discharging temperature and indoor heat

exchanger temperature does not rise.

Inspect the failure by checking discharg-

ing pressure.

Replace linear expansion valve. 2 If refrigerant leaks, discharging tempera-

ture rises and LEV opening increases.

Inspect leakage by checking the tem-

perature and opening.

Check pipe connections for gas leakage.

3 Check the insulation. 4 Open intake grille and check the filter.

Clean the filter by removing dirt or dust on it.

5 If the filter is clogged, indoor pipe tem-

perature rises and discharging pressure increases. Check if heat exchanger is clogged by inspecting discharging pressure.

Clean the heat exchanger.

6 Remove the blockage. 7 Check refrigerant system during opera-

tion.

3.1 For 3 minutes after temperature

adjuster turns off, the compressor will not start operating even if temperature adjuster is turned on.

2 For 3 minutes after temperature

adjuster turns on, the compressor will not stop operating even if temperature adjuster is turned off.

(Compressor stops operating

immediately when turning off by the remote controller.)

12 Normal operation (For protection of compressor)

12 Normal operation

38

9-5. SPECIAL FUNCTIONS

9-5-1. Low noise mode (on-site modification) (Fig. 9-1)

By performing the following modification, operation noise of the outdoor unit can be reduced by about 3-4 dB. The low noise mode will be activated when a commercially available timer or the contact input of an ON/OFF switch is added to the CNDM connector (optional parts) on the control board of the outdoor unit.

• The capacity may be insufficient according to the outdoor temperature and conditions, etc. 1 Complete the circuit as shown when using the external input adapter (PAC-SC36NA). (Optional parts)



~



SW1







1

X



2 3







CNDM

 Remote control panel  Relay circuit  External input adapter (PAC-SC36NA)



 Outdoor unit control board  Replay power supply



 Procure locally  Max. 10m  Orange  Brown  Red

Fig. 9-1

9-5-2. Demand function (on-site modification) (Fig. 9-2)

• It is possible to reduce electricity consumption within a range from 0 to 100 % by performing the following on-site installation. The demand function can be enabled by adding a commercially available input contact point ON/OFF switch to the CNDM connector (the contact point demand input, optional parts).

1 Incorporate the “Adapter for external input (PAC-SC36NA)” into the circuit as shown in the diagram below. 2 By switching SW7-1 on the control circuit board for the outdoor unit, the following power consumption restrictions

(compared to rated power) can be set.

SW7-1

OFF

ON



Power consumption when SW2 is on

0% (Forced compressor stop)

50%

 



~

SW2



Y

1



2



3





CNDM

 Remote control panel  Relay circuit  External input adapter (PAC-SC36NA)



 Outdoor unit control board  Replay power supply



Fig. 9-2

9-5-3. Error and compressor operation monitoring function (CN51)



L1

~



L2



X

Y





CN51

5 4 3









 Distant control board  Relay circuit  External output adapter (PAC-SA88HA-E)  Outdoor unit control board

L

1 : Error display lamp

L

2 : Compressor operation lamp

X, Y : Relay (Coil standard of 0.9W or less for DC 12V) X, Y : Relay (DC1mA)

Fig. 9-3

9-5-4. Auto change over - Operation mode locking function by external signal (CN3S)



SW1



~

SW2



X

Y







CN3S

1

2 3







 Remote control panel  Relay circuit  External input adapter (PAC-SC36NA)  Outdoor unit control board

ON SW1 SW2

+ The indoor unit, which is operating in the mode different from the one determined by external signal (CN3S), will be a state of standby.

+ The setting becomes effective when the outdoor unit is under stop. + The operation mode specified by test run will be prior to the mode of this function.

Heating

Validity of SW1

OFF

Cooling

Invalidity of SW1

 Relay power supply  Procure locally  Max. 10m

Fig. 9-4

 Procure locally  Max. 10m  Orange  Brown  Red

 Lamp power supply  Procure locally  Max. 10m

39

9-6. HOW TO CHECK THE PARTS OUTDOOR UNIT : MXZ-8A140VA MXZ-8A140VA

1 MXZ-8A140VA2 MXZ-8A140VA3

Parts name

Thermistor (TH3) <Outdoor pipe>

Thermistor (TH4) <Discharge>

Thermistor (TH7) <Outdoor>

Thermistor (TH8) <Heatsink>

Fan motor(MF1,MF2)

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

Motor for compressor (MC)

U

Check points

Disconnect the connector then measure the resistance with a tester. (At the ambient temperature 10~30)

Abnormal

Open or short

TH4

TH3

TH7

TH8

Normal

160k ~ 410k

4.3k ~9.6k

39k ~ 105k

Refer to next page.

Measure the resistance between the terminals with a tester. (At the ambient temperature 20

Normal

MXZ-8A140VA

(1) MXZ-8A140VA2, 3

1370 ± 100



)

1435 ± 150

Abnormal

Open or short

Measure the resistance between the terminals with a tester.



(Winding temperature 20

Normal

)

Abnormal

V

W

Solenoid valve coil <Bypass valve> (SV1)

Solenoid valve coil <Bypass valve> (SV2)

0.188

Open or short

Measure the resistance between the terminals with a tester. (At the ambient temperature 20)

Normal

1327 ± 10

Abnormal

Open or short

Measure the resistance between the terminals with a tester. (At the ambient temperature 20

Normal

MXZ-8A140VA

(1) MXZ-8A140VA2, 3

1197 ± 10



)

1450 ± 150

Abnormal

Open or short

40

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

Notes



· High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service.

· Do not pull out the connector (CNF1, 2) for the motor with the power supply on. (It causes trouble of the outdoor controller circuit Self check



Symptom : The outdoor fan cannot turn around.

Fuse check

Check the fuse (F5) on outdoor controller board.

board and fan motor.)

Did the fuse blow?

No

Wiring contact check

Contact of fan motor connector (CNF1, 2)

Is there contact failure?

No

Power supply check (Remove the connector (CNF1, 2))

Measure the voltage in the outdoor controller circuit

TEST POINT

 : VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC250~330V

Yes

Replace outdoor controller board (C.B) and fan motor (MF1, 2).

Wiring recovery

board.

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

Is the voltage normal?

No

Yes

Replace the fan motor.

Yes

Check the operation of fan. END

Replace outdoor

controller board.

OK

Check the operation. END

NG

Replace outdoor controller board.

NG

OK

Replace the fan motor.

41

Low temperature thermistors

Pipe temperature thermistor <Liquid> (TH3) Pipe temperature thermistor <Cond.> (TH6) Outdoor temperature thermistor (TH7) Gas pipe temperature thermistor (TH-A ~ TH-E)···· Branch box

Thermistor R0 = 15k' ± 3% B constant = 3480 ± 2%

R

t =15exp{3480(

0: 15k' 10: 9.6k'

11

273+t – 273

30: 4.3k' 40: 3.0k'

)}

20: 6.3k' 25: 5.4k'

Medium temperature thermistor

Heatsink temperature thermistor (TH8)

50

40

30

20

Resistance (k)

10

0

-20 -10 0 10 20 30 40 50

Temperature ()

200

Thermistor R50 = 17k' ± 2% B constant = 4170 ± 3%

11

t =17exp{4170(

R

273+t – 323

)}

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

High temperature thermistor

Discharge temperature thermistor (TH4)

Thermistor R120 = 7.465k' ± 2% B constant = 4057 ± 2%

t =7.465exp{4057(

R

20: 250k' 30: 160k' 40: 104k' 50: 70k' 60: 48k'

11

273+t – 393

)}

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

150

100

Resistance (k)

50

0

500

400

300

200

Resistance (k)

25 50 75 100110 125

Temperature ()

42

100

0

25

50 75 100 120

Temperature ()

BRANCH BOX : PAC-AK50BC PAC-AK30BC PAC-AK51BC PAC-AK31BC

Parts name

Thermistor (TH-A~E) <Gas pipe>

Linear expansion valve ( LEV-A~E )

M

Red

Brown

Blue

Orange

Yellow

White

1 2 3

4 5 6

Check points

Disconnect the connector then measure the resistance with a tester. (At the ambient temperature 10~30)

Normal

4.3k ~ 9.6k

Abnormal

Open or short

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

Winding temperature 20

Red - White

Red - Orange

)

Normal

Brown - Yellow

Brown - Blue

Abnormal

Open or short

46 ± 4

43

Linear expansion valve

(LEV) in Branch box

(1) Operation summary of the linear expansion valve

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

• Valve position can be changed in proportion to the number of pulse signal.

branch box controller board

DC12V

1

LEV

3

2

M

5

1

6

4

:4

:3

:2

:1

Red

Brown

Blue

Orange

Yellow

White

2

3

4

5

6

Drive circuit

:4

:3

:2

:1

OFF

ON

OFF

Output

5678

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON



Output

(Phase)

:1

:2

:3

:4

234

1

ON

OFF

ON

OFF

(2) Linear expansion valve operation

Connector LEV-A

LEV-B LEV-C LEV-D LEV-E

Opening a valve : 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8 Closing a valve : 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1 The output pulse shifts in above order.

• When linear expansion valve operation stops, all output phase become OFF.

• When the switch is turned on, 700 pulse closing valve signal will be sent till it goes to A point in order to define the valve position.

(The pulse signal is being sent for about 20 seconds.)

• When the valve moves smoothly, there is no sound or vibration occurring from the linear expansion valve : however, when the pulse number moves from B to A or when the valve is locked, sound can be heard.

No sound is heard when the pulse number moves from B to A in

case coil is burnt out or motor is locked by open-phase.

Valve position (capacity)



Extra tightening (about 32 pulse)

Close



Open

Pulse number

• Sound can be detected by placing the ear against the screw driver handle while putting the screw driver to the linear expansion valve.

500 pulse Opening a valve all the way

44

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

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

Coil

Lead wire

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

Stopper

Main body

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

B

A

Be sure to attach the stopper to pipe B.

45

Troubleshooting

Problem

Locked expansion valve

Check point

If the linear expansion valve becomes locked and the motor is still operating, the motor will emit a clicking noise and will not function. This clicking noise indicates an abnormality.

Corrective measure

Replace the linear expansion valve.

Short circuit or broken circuit in expansion valve motor coil

Valve does not close completely.

Incorrect connection or connection failure

Use an all-purpose electrical meter to measure the resistance between the different coils (red-white, red-orange, brown-yellow, brown-blue). Normal resistance is within a range of 46 ± 4%.

In order to check the linear expansion valve, operate 1 indoor unit in the fan mode and another in the cooling mode. Then, use the outdoor multi controller board to operate the monitor and check the pipe temperature of the indoor unit. The linear expansion valve should be fully closed when the fan is operating. The temperature measured by the temperature sensor will drop if there is any leakage. If the measured temperature is significantly lower than that on the remote controller, this indicates that the valve is not closed. It is not necessary to replace the linear expansion valve if the leak of refrigerant is small and does not cause a malfunction.

 Check improperly connected connector terminals and the wire colors.  Remove the connector on the controller board side and check electrical

conductance.

Replace the linear expansion valve.

Replace the linear expansion valve if there is a major leak of refrigerant.

Continuity check of wrong part

46

9-7. TEST POINT DIAGRAM

9-7-1. Outdoor controller circuit board MXZ-8A140VA MXZ-8A140VA1 MXZ-8A140VA2

CNS

(Branch box/outdoor unit connecting wire)

Communication power supply ZD71 Voltage developed across: 16-30V DC

+

–

CNAC

2 to 4: Power supply for outdoor controller circuit board (220V-240V AC) 1 to 3: Power supply for indoor and branch box / outdoor unit connection wire (220V-240V AC)

CN2

Connect to the outdoor power circuit board (CN2) 1-5: Power circuit board → Transmitting signal to the controller circuit board (0-5V DC) 2-5: Zero cross signal (0-5V DC)

3-4: Not used 6-5: 18V DC 7-5: 18V DC

[5: – 1,2,6,7: + ]

52C Contactor

<CAUTION> TEST POINT1 is high voltage.

VCC (TEST POINT 2)

(voltage between pins of C6B): DC 15V

63H

High pressure switch

VDC (TEST POINT 1)

(voltage between pins of C5E): DC280V-350V

CNDC

DC280V-350V

+

Connect from

}

outdoor power

–

circuit board

(CNDC)

VSP (TEST POINT 3)

(voltage between pins of C5A, C5B): DC 0V (when stopped), DC 1– 6.5V (when operated)

VFB (TEST POINT 4)

(voltage between right pins of PC5C and PC5D, pin 3 and pin 4)

TH6

Thermistor <Outdoor 2-phase pipe>

TH7

Thermistor<Outdoor>

TH3

Thermistor <Outdoor pipe>

TH4

Thermistor <Discharge>

21S4

Four-way valve

SV2

Solenoid valve2

SV1

Solenoid valve1

CN4

Transmission to outdoor power circuit board (CN4)

LED3

CN51

CN3S

CNDM

1 to 2: Input of low noise mode 1 to 3: Input of external

contact point

47

SW10

SW2

SW9

63HS

High pressure sensor

63L

Low pressure switch

SW5

Function switch

SW6

Model setup

SW1

Forced defrost, detect history record reset

SW7

SW4

Test operation

Outdoor controller circuit board

MXZ-8A140VA3

SW1

Forced defrost, detect history record reset

SW6

Model select

SW4

Test operation

SW5

Function switch

SW8

SW7

SW9

SW2

CN3S

<CAUTION> TEST POINT1 is high voltage.

CN51

CNDM

1 to 2: Input of low noise mode 1 to 3: Input of external contact point

CN52C

(Connect to the noise filter circuit board (CN52C))

LED

CN4

Transmission to outdoor power circuit board (CN4)

63L

Low pressure switch

63HS

High pressure sensor

TH4

Thermistor <Discharge>

TH3

Thermistor <Outdoor pipe>

TH7/6

Thermistor <Outdoor/ 2-phase pipe>

63H

High pressure switch

V

FG

(TEST POINT 4)

(Voltage between right pins of PC5C and PC5D, pin 3 and pin 4) (Same as

7(+)-4(-))

(CNF1

SV1

Solenoid valve 1

SV2

Solenoid valve 2

21S4

Four-way valve

CN2

Connect to the outdoor power circuit board (CN2) 1-5: Reception from

power circuit board

2-5: Zero cross signal (0-5V DC)

3,4: Not used 6-5: 16V DC 7-5: 16V DC

CNAC

2 to 4: Power supply for outdoor controller circuit board (220V-240V AC) 1 to 3: Power supply for indoor and outdoor unit connection wire (220-240V AC)

VSP (TEST POINT 3)

(Voltage between pins of C5A, C5B): DC 0V (when stopped), DC 1–

6.5V (when operated)

CNF1, CNF2 Connect to the fan motor

1-4: 250 - 330V DC 5-4: 15V DC 6-4: 0-6.5V DC 7-4: 15V DC(When stopped)

7.5V DC(When operated)(0V-15V pulse)

CNDC

280V DC (1+, 3-) Connect to outdoor power circuit board(CNDC)

48

CNS

S1-S2: 220-240V AC (Branch box/outdoor unit connecting wire)

+ -

Communication power supply D71 Voltage 24V DC

9-7-2. Outdoor noise filter circuit board MXZ-8A140VA

LO, NO Voltage of 220-240V AC is output (Connect to the outdoor power circuit board (SC-R, SC-S))

CNAC1, CNAC2 220-240V AC (Connect to the outdoor controller circuit board (CNAC))

EI Connect to the earth

CN5 Primary current (Connect to the outdoor power circuit board (CN5))

LI, NI Voltage of 220-240V AC is input (Connect to the terminal block(TB1))

49

Outdoor noise filter circuit board MXZ-8A140VA

1

MXZ-8A140VA2

LO, NO Voltage of 220-240V AC is output (Connect to the outdoor power circuit board)

TABS

TABT

CNAC1, CNAC2 220-240V AC (Connect to the outdoor controller circuit board (CNAC))

EI Connect to the earth

CN5 Primary current (Connect to the outdoor power circuit board (CN5))

LI, NI Voltage of 220-240V AC is input (Connect to the terminal block(TB1))

50

Outdoor noise filter circuit board

MXZ-8A140VA3

RS1

CNAC1, CNAC2 220-240V AC (Connect to the outdoor controller circuit board (CNAC))

CN52C 52C driving signal (Connect to the outdoor controller circuit board (CN52C).)

LO, NO Voltage of 220-240V AC is output (Connect to the outdoor power circuit board (TABS, TABT))

EI Connect to the earth

E2 Connect to the earth

CN5 Primary current (Connect to the outdoor power circuit board (CN5))

LI, NI Voltage of 220-240V AC is input (Connect to the terminal block(TB1)).

51

9-7-3. Outdoor power circuit board MXZ-8A140VA

CN5 Detection of primary current (Connect to the outdoor noise filter circuit board (CN5))

CN3 Temperature <Heatsink> (TH8)

Brief Check of POWER MODULE W Usually, they are in a state of being short-circuited if they are broken. Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken.

1. Check of POWER MODULE 1 Check of DIODE circuit

L - P1 , N - P1 , L - N1 , N - N1 2 Check of IGBT circuit P2 - U , P2 - V , P2 - W , N2 - U , N2 - V , N2 - W

Note:The marks, L , N , N1 , N2 , P1 , P2 , U , V and W shown in the diagram are not actually printed on the board.

CN4 Connect to the outdoor controller circuit board (CN4)

CNAF Connect to ACTM

CN2 Connect to the outdoor controller circuit board (CN2) 1-5: Power circuit board → Transmitting

signal to the controller board (0-5V DC)

2-5: Zero cross signal (0-5V DC) 3-4: 18V DC 6-5: 15V DC 7-5: 15V DC

[ 5 : – 1, 2, 6, 7 : + ] [ 4 : – 3 : + ]

N1

P2

P1

W

U

N2

N

TAB-U, TAB-V, TAB-W Connect to the compressor (MC) Voltage among phases:

V

L

5V-180V AC

SC-R, SC-S Connect to the outdoor noise filter circuit board (LO, NO) 220V-240V AC

SC-P2, SC-N2 Connect to ACTM and the smoothing capacitor

SC-P1 Connect to 52C

SC-N1 Connect to ACTM

POWER MODULE

52

CNDC

–

280V-350V DC

}

+

Connect to the outdoor controller circuit board (CNDC)

Outdoor power circuit board MXZ-8A140VA1 MXZ-8A140VA2 MXZ-8A140VA3

Brief Check of POWER MODULE W Usually, they are in a state of being short-circuited if they are broken. Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken.

1. Check of POWER MODULE

1.Check of DIODE circuit S - P1 , T - P1 , S - N1 , T - N1

2.Check of IGBT circuit P2 - U , P2 - V , P2 - W , N2 - U , N2 - V , N2 - W

Note:The marks, L , N , N1 , N2 , P1 , P2 , U , V and W shown in the diagram are not actually printed on the board.

CN2 Connect to the outdoor controller circuit board (CN2) 1-5:Transmitting signal to the outdoor controller circuit board (0~5V DC)

2-5:Zero cross signal (0~5V DC) 3-4:18V DC 6-5:16V DC 7-5:16V DC

CN3 Thermistor (TH8) <Heatsink>

CN5 Detection of primary current Connect to the outdoor noise filter circuit board (CN5)

CNDC 310V DC (1+, 3–) Connect to the outdoor controller circuit board

TABS/T Connect to the outdoor noise filter circuit board Voltage among phases:220-240V AC

TABN1/SC-N1 Connect to the ACTM(-)

TABP1/SC-P1 Connect to 52C

CN4 Connect to the outdoor controller circuit board (CN4)

TABP2/SC-P2 Connect to the ACTM(P)

TABU/V/W Connect to the compressor (MC) Voltage among phases:10V~180V AC

53

TABN2/SC-N2 Connect to the ACTM(N2)

9-7-4. Branch box controller board PAC-AK50BC PAC-AK30BC PAC-AK51BC PAC-AK31BC

TH-A to E Connect to Thermistor-A to E TH-A to C for PAC-AK30/31BC

LED3~5 Not used

LED2 Transmission (Branch box/outdoor) Reception state display on branch box side

LED1 Transmission start-up state display Start-up : LED1 blinks (0.5sec. : ON, 0.5sec. : OFF) Start-up completion: LED1 lights

LEV-A to E Connect to LEV-A to E LEV-A to C for PAC-AK30/31BC

Branch box No.1 LED2 blinks once. (0.1sec. : ON,

0.9sec. : OFF)

Branch box No.2 LED2 blinks twice. (0.1sec. : ON,

0.1sec. : OFF

0.1sec. : ON,

0.7sec. : OFF) *The blinking interval

might change when there are changes in states of indoor units.

TB3A to TB3E Connect to TB3A to TB3E (Branch box/Indoor unit connecting wire) TB3A to TB3C for PAC-AK30/31BC

54

CN3C, CND Connect to TB2B (Branch box/Outdoor unit connecting wire)

9-7-5. Active filter module MXZ-8A140VA MXZ-8A140VA

1

MXZ-8A140VA2

–

Connect to the outdoor power circuit board (TABN1)

+

Connect to the outdoor power circuit board (TABP1)

L1, L2 Connect to the DCL (Reactor)

Connect to the outdoor power circuit board (CNAF)

1 : GND 2-1 : 15V DC 3-1 : Control signal 4, 5 : Not used 6-1 : Control signal

I Not used

N2 Connect to the outdoor power circuit board (TABN2)

Connection and internal circuit diagram

DCL

L1 L2

P Connect to the outdoor power circuit board (TABP2)

N1 Non-connect

ACTM

(+)

(- )

55

P

N1 N2

I

Load

Active filter module MXZ-8A140VA3

L1, L2 Connect to the DCL (Reactor)

P Connect to the outdoor power circuit board (TABP2)

N1 Non-connect

Upper side

+

Connect to the outdoor power circuit board (TABP1)

–

Connect to the outdoor power circuit board (TABN1)

Connect to the outdoor power circuit board (CNAF)

1 : GND 2-1 : 15V DC 3-1 : Control signal 4, 5 : Not used 6-1 : Control signal

Lower side

N2 Non-connect

Io Connect to the outdoor power circuit board (TABN2)

Connection and internal circuit diagram

(+)

(- )

DCL

L1 L2

56

ACTM

P

N1 N2

I

Load

9-8. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS

(1) Function of switches

Type of

Switch

Dip

switch

Switch

SW1

No.

1

2

3

Function Effective timing

Forced defrost Start

Abnormal history clear

No function

4

5

Self-diagnosis

(Indoor unit selection)

Action by the switch operation

ON OFF

Normal

Clear

—

1ON23456

Indoor No.1

1ON23456

Indoor No.4

1ON23456

Indoor No.7

OC

BC#1 (5- branch type)

ABCDEABC

1ON23456

Indoor No.2

1ON23456

Indoor No.5

1ON23456

Indoor No.8

Normal

—

1ON23456

Indoor No.3

1ON23456

Indoor No.6

BC#2

(3- branch type)

When compressor is operating in heating operation. +

off or operating

—

Indicating a particular self-diagnosis

IC

R C

No.4

IC

R C

Indoor

No.5

ICRCIC IC

RC

Indoor

No.1

6

No.2

BC#1 : branch box controller unit Number 1

R C

Indoor

No.3

Indoor

1 blinking LED2 (branch box controller board)

BC#2 : branch box controller unit Number 2

2 blinking LED2 (branch box controller board)

SW4

1

2

Test run Operating OFF

Test run mode setting

Heating Cooling

Under suspension

Forced defrost should be done as follows.

1 Change the DIP SW1-1 on the outdoor controller board from OFF to ON. 2 Forced defrost will start by the above operation 1 if these conditions written below are satisfied.

• Heat mode setting

• 10 minutes have passed since compressor started operating or previous forced defrost finished.

• Pipe temperature is less than or equal to 8:.

3 Forced defrost will finish if certain conditions are satisfied. wForced defrost can be done if above conditions are satisfied when DIP SW1-1 is changed from OFF to ON.

After DIP SW1-1 is changed from OFF to ON, there is no problem if DIP SW1-1 is left ON or changed to OFF again. This depends on the service conditions.

57

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

Type of

Switch

Dip

switch

Switch

SW5

SW7

SW8

SW6

SW9

No.

1

2

3

4

1

2

3

4

5

6

1

2

3

1

2

3

4

5

6

1

2

Function Effective timing

No function

Switching the target

sub-cool (Heating mode)

No function

Demand switching function

No function

Max. Frequency down

No function

Model selection

LEV opening setting function for stopping unit during heating operation

Switching function of defrosting prohibited time

Action by the switch operation

ON OFF

—

Target sub-cool down

—

Capability cut

50%

—

Active

—

Changed

60 minutes

—

Normal

—

Normal

—

Normal

—

SW6

1ON23456

Normal

30 minutes

(Normal)

—

Always

—

Always

—

Always

—

Always

SW10

Switching the Input

1

Current Limit Level

During the FAN or COOL mode, and thermo - OFF in heating operation, set the

2

opening of liner expansion valve on branch box

3 A down

Active

Normal

Inactive

Before turning

the power on

While unit stopping

58

MXZ-8A140VA3

Type of

Switch

Dip

switch

Switch

SW5

SW7

SW8

SW6

SW9

No.

1

2

3, 4

5, 6

1

2

3

4

5

6

1

2

3

1

2

3

4

5

6

7

8

1

2

3

Function Effective timing

No function

Switching the target

sub-cool

Max. Frequency down

LEV opening setting function for stopping unit during heating operation

Switching function of defrosting prohibited time

Switching the Input Current Limit Level

(Heating mode)

No function

Demand switching function

No function

Model selection

Action by the switch operation

ON OFF

—

Target sub-cool down

—

Capability cut

50%

—

Active

—

Changed

60 minutes

3 A down

—

Normal

—

Normal

—

Normal

—

SW6

1ON2345678

Normal

30 minutes

(Normal)

Normal

—

Always

—

Always

—

Always

—

Always

Before turning

the power on

During the FAN or COOL

4

(2) Function of connector

mode, and thermo - OFF in heating operation, set the opening of liner expansion valve on branch box

Active

Inactive

While unit stopping

Action by Pin short operation

Types Connector Function Effective timing

Pin 2-3 Short

Normal

When power supply ON

Connector

CN31

LEV opening function

(at start-up)

Pin 1-2 Short

Open a little bit

59

Digital indicator LED3 displays 2 digit number or code to inform operation condition and the meaning of error code by controlling DIP SW2 on outdoor controller. Operation indicator SW2 : Indicator change of self diagnosis

SW2 setting

1ON23456

Display detail

Explanation for display

(Be sure that 1 to 6 in the SW2 are set to OFF.)

(1) Display when the power supply is ON. When the power supply is ON, blinking displays by turns.

1 second

interval

Wait for 4 minutes at the longest. (2) When the display lights (Normal operation) 1Operation mode display

Unit

(Lighting)

SW2

LED3

1ON23456

The tens digit : Operation mode

Display Operation Model

O

C H d

OFF / FAN

COOLING / DRY

HEATING

DEFROSTING

2Display during error postponement Postponement code is displayed when compressor stops due to the work of protection device. Postponement code is displayed while error is being postponed.

(3) When the display blinks Inspection code is displayed when compressor stops due to the work of protection devices.

Display Inspection unit

01Outdoor unit,

Branch box unit

Indoor unit

Display Contents to be inspected (During operation)

U2

U7

U1

UL U6 UF UH UP U3

U4

U5 U8 U9

PA

The ones digit : Relay output

Display

0 1 2 3 4 5 6 7 8 A

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 H8), 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.)

Warming-up Compressor

— — — — — — —

— ON ON

Compressor

— — —

— ON ON ON ON

—

4-way valve

—

— ON ON

—

— ON ON

— ON

(Initial setting)

Solenoid valve

(SV1, 2)

—

ON

—

ON

—

ON

—

ON

— —

Display Contents to be inspected (When power is turned on)

63L connector(red) is open.

F3

63H connector(yellow) is open.

F5

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

F9

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

E8

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

E9

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

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

EA

• 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)

Eb

Startup time over

Ec

Communication error except for outdoor unit

E0~E7

60

SW2 setting

1ON23456

Display detail

Pipe temperature / Liquid (TH3) – 40~90

The black square (■) indicates a switch position.

Explanation for display

– 40~90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When –10:; 0.5 secs. 0.5secs. 2 secs.

10

Unit

:

1ON23456

Discharge temperature (TH4) 3~217

Output step of outdoor FAN 0~10

The number of ON / OFF times of compressor 0~9999

Compressor integrating operation times 0~9999

3~217 (When the discharge thermistor detects 100: or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 105:; 0.5 secs. 0.5secs. 2 secs.

1

05

0~10

0~9999 (When the number of times is 100 or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 42500 times (425 → 100 times);

0.5 secs. 0.5 secs. 2 secs.

4

25

0~9999 (When it is 100 hours or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 2450 hours (245 → 10 hours);

0.5 secs. 0.5 secs. 2 secs.

2

45

:

Step

100 times

10 hours

1ON23456

Compressor operating current 0~50

Compressor operating frequency 0~225

0~50 wOmit the figures after the decimal fractions.

0~255 (When it is 100Hz or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 125Hz; 0.5 secs. 0.5 secs. 2 secs.

LEV opening pulse 0~500

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

4 0 1 0 1 0 1 0 1

SW1

Error postponement code history (1) of outdoor unit

1

0~500

65

(When it is 100 pulse or more, hundreds digit, tens

0

0 0 1 1 0 0 1 1

digit and ones digit are displayed by turns.

0 0

(Example)

0

When 150 pulse; 0.5 secs. 0.5 secs. 2 secs.

1 1 1 1

Postponement code display Blinking: During postponement

25

1

50

Lighting: Cancellation of postponement “00” is displayed in case of no postponement.

Operation mode on error occurring Operation mode of when operation stops due to

error is displayed by setting SW2 like below.

(SW2)

1ON23456

A

Hz

Pulse

Code

display

Code

display

61

SW2 setting

1ON23456

Display detail

Pipe temperature / Liquid (TH3) on error occurring – 40~90

The black square (■) indicates a switch position.

Explanation for display

– 40~90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When –15:; 0.5 secs. 0.5 secs. 2 secs.

15

Unit

:

1ON23456

Compressor temperature (TH4) or discharge temperature (TH4) on error occurring 3~217

Compressor operating current on error occurring 0~50

Error code history (1) (latest) Alternate display of abnormal unit number and code

Error code history (2) Alternate display of error unit number and code

Thermostat ON time 0~999

3~217 (When the temperature is 100: or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When –15:; 0.5 secs. 0.5 secs. 2 secs.

1

30

0~50

When no error history, “ 0 ” and “–” are displayed by turns.

0~999 (When it is 100 minutes or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 245 minutes; 0.5 secs. 0.5 secs. 2 secs.

2

45

:

A

Code

display

Code

display

Minute

1ON23456

Test run elapsed time 0~120

Capacity code of indoor unit (Qj)

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

SW1 4 0 1 0 1 0 1 0 1

0~120 (When it is 100 minutes or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 105 minutes; 0.5 secs. 0.5 secs. 2 secs.

1

05

The capacity code of indoor unit is displayed.

65 0

0

1

0

1

0

1

0

1

62

Minute

Code

display

SW2 setting

1ON23456

The black square (■) indicates a switch position.

Display detail

Capacity setting display Displayed as an outdoor capacity code.

Explanation for display

Capacity

MXZ-8A140VA

Code

25

Unit

Code

display

1ON23456

Outdoor unit setting information

Indoor pipe temperature / Liquid – 39~88

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

SW1 4 0 1 0 1 0 1 0 1

65 0

0

1

0

1

0

1

0

1

Indoor pipe temperature / Cond. / Eva. Indoor – 39~88

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

SW1 4 0 1 0 1 0 1 0 1

65 0

0

1

0

1

0

1

0

1

Branch box pipe temperature / gas – 39~88

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

SW1 4 0 1 0 1 0 1 0 1

65 0

0

1

0

1

0

1

0

1

Targeted evaporating temperature : ETm (Cooling) Targeted high pressure : Pdm (Heating) – 39~88

• The tens digit (Total display for applied setting)

Setting details

H·P /

Cooling only

Single phase / 3 phase

Display details

0 : H·P 1 : Cooling only

0 :

Single phase

2 : 3 phase

• The ones digit Setting details

Defrosting switch

(Example) MXZ-8A140VA, “00” is displayed.

– 39~88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.)

0 : Normal 1 : For high humidity

Display details

Code

display

:

of/f

1ON23456

Indoor room temperature 8~39

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

SW1 4 0 1 0 1 0 1 0 1

8~39

65 0

0

1

0

1

0

1

0

1

:

63

SW2 setting

1ON23456

Display detail

Indoor setting temperature 17~30

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

SW1 4 0 1 0 1 0 1 0 1

The black square (■) indicates a switch position.

Explanation for display

17~30

65 0

0

1

0

1

0

1

0

1

Unit

:

1ON23456

Outdoor pipe temperature / 2-phase (TH6) – 39~88

Outdoor temperature (TH7) – 39~88

Outdoor heatsink temperature (TH8) – 40~200

Discharge superheat. SHd 0~255

Sub-cool. SC (cooling mode) 0~130

– 39~88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.)

– 40~200 (When the temperature is 0: or less, “–” and temperature are displayed by turns.) (When the thermistor detects 100: or more, hundreds digit, tens digit and ones digit are displayed by turns.)

0~255 (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.)

0~130 (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.)

:

°C

1ON23456

Input current of outdoor unit 0~500

(When it is 100 or more, hundreds digit, tens digit and ones digit are displayed by turns.)

High pressure 63HS 0~500

(When it is 100 or more, hundreds digit, tens digit and ones digit are displayed by turns.) (0~4.9MPa)

Targeted operation frequency 0~255

0~255 (When it is 100Hz or more, hundreds digit, tens digit and ones digit are displayed by turns.)

DC bus voltage 180~370

180~370 (When it is 100V or more, hundreds digit, tens digit and ones digit are displayed by turns.)

64

0.1 A

0.1 of/f

Hz

V

SW2 setting

1ON23456

Display detail

Target Sub-cool (Cooling mode) : SCm 0~255

The black square (■) indicates a switch position.

Explanation for display

Unit

:

1ON23456

Error postponement code history (2) of outdoor unit

Error postponement code history (3) of outdoor unit

Error code history (3) (Oldest) Alternate display of abnormal unit number and code

Error thermistor display

When there is no error thermistor, “–“ is displayed.

Operation frequency on error occurring 0~255

Postponement code display Blinking: During postponement Lighting: Cancellation of postponement “00” is displayed in case of no postponement.

When no error history, “0” and “–“ are displayed by turns.

: Outdoor pipe temperature /Liquid (TH3)

3

: Outdoor outside temperature (TH7)

7

: Outdoor radiator panel (TH8)

8

: Branch box pipe temperature / Gas (TH–A~E)

23

: High pressure sensor (63HS)

63

0~255 (When it is 100Hz or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 125Hz; 0.5 secs. 0.5 secs. 2 secs.

1

25

Code

display

Code

display

Code

display

Code

display

Hz

1ON23456

Fan step on error occurring 0~10

LEV opening pulse on error occurring 0~500

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

Indoor room temperature on error occurring 8~39

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

SW1 4 0 1 0 1 0 1 0 1

0~10

0~500 (When it is 100 pulse or more, hundreds digit, tens

65

digit and ones digit are displayed by turns.)

0

(Example)

0

1

When 130 pulse; 0.5 secs. 0.5 secs. 2 secs.

0

1

0

1

0

1

30

8~39

65 0

0

1

0

1

0

1

0

1

Step

Pulse

:

65

SW2 setting

1ON23456

Display detail

Indoor pipe temperature / Liquid on error occurring – 39~88

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

SW1 4 0 1 0 1 0 1 0 1

The black square (■) indicates a switch position.

Explanation for display

– 39~88 (When the temperature is 0 °C or less, “–” and

65

temperature are displayed by turns.)

0

(Example)

0

1

When –15 °C; 0.5 secs. 0.5 secs. 2 secs.

0

1

0

1

0

1

15

Unit

:

1ON23456

Indoor pipe temperature / Cond./ Eva. on error occurring – 39~88

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

SW1 4 0 1 0 1 0 1 0 1

0 0 1 1 0 0 1 1

Outdoor pipe temperature / 2-phase (TH6) on error occurring – 39~88

Outdoor outside temperature (TH7) on error occurring – 39~88

Outdoor heatsink temperature (TH8) on error occurring – 40~200

– 39~88 (When the temperature is 0 °C or less, “–” and temperature are displayed by turns.)

65 0

(Example)

0

When –15 °C; 0.5 secs. 0.5 secs. 2 secs.

0 0 1 1 1 1

15

– 39~88 (When the temperature is 0 °C or less, “–” and temperature are displayed by turns.) (Example) When –15 °C; 0.5 secs. 0.5 secs. 2 secs.

15

– 39~88 (When the temperature is 0 °C or less, “–” and temperature are displayed by turns.) (Example) When –15 °C; 0.5 secs. 0.5 secs. 2 secs.

15

– 40~200 (When the temperature is 0 °C or less, “–” and temperature are displayed by turns.) (When the temperature is 100 °C or more, hundreds digit, tens digit and ones digit are displayed by turns.)

:

1ON23456

Discharge superheat on error occurring SHd 0~255

Sub-cool on error occurring. SC 0~130

0~255 (When the temperature is 100 °C or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 150 °C; 0.5 secs. 0.5 secs. 2 secs.

1

50

0~130 (When the temperature is 100 °C or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 115 °C; 0.5 secs. 0.5 secs. 2 secs.

1

15

66

:

SW2 setting

1ON23456

Display detail

Thermostat-on time until error stops 0~999

Target rotation of outdoor fan motor 0~999

Sub-cool (Heating mode) 0~130

Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

0~999 (When it is 100 minutes or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 415 minutes;

0.5 secs. 0.5 secs. 2 secs.

SW1

4

65 0

0

1

0

1

0

1

0

1

0

1

0

1

The black square (■) indicates a switch position.

Explanation for display

4

15

Unit

Minute

rpm

:

1ON23456

Code of the difference between room temperature and set temperature ("∆Tj": 0–99)

■ Tens digit of code: current ∆Tj

■ Units digit of code: ∆Tj a minute ago

U9 Error status during the Error postponement period

Code of the difference between room temperature and set temperature ("∆tj")

∆tj

∆tj = room temp. − Set temp. ∆tj = Set temp. − room temp.

0 1 2 3 4 5 6 7 8 9

SW setting (1-4, 5, 6)

000 100 010 110 001 101 011 111

Description Detection point Display

Normal Overvoltage error Undervoltage error T phase interruption error Abnormal power synchronous signal PFC error (Overvoltage / Undervoltage / Overcurrent)

Cooling Heating

∆tj  −0.5

−1.0 < ∆tj  −0.5

−0.5 < ∆tj  −0.5

0.0 < ∆tj  0.0

0.5 < ∆tj  0.5

1.0 < ∆tj  1.0

1.5 < ∆tj  0.5

2.0 < ∆tj  2.0

2.5 < ∆tj  2.5

3.0 < ∆tj  3.0

Target unit Indoor unit 1 Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 6 Indoor unit 7 Indoor unit 8

— Power circuit board Controller circuit board Power circuit board Power circuit board

Power circuit board

∆tj  −0.5

−0.5 < ∆tj  0.0

0.0 < ∆tj  0.5

0.5 < ∆tj  1.0

1.0 < ∆tj  1.5

1.5 < ∆

tj  2.0

2.0 < ∆tj  2.5

2.5 < ∆tj  3.0

3.0 < ∆tj  3.5

3.5 < ∆tj

Code

display

00 01 02 04 08

10

Code

display

 Display examples for multiple errors: Overvoltage (01) + Undervoltage (02) = 03 Undervoltage (02) + Power-sync signal error (08) = 0A T phase interruption (04) + PFC error (10) = 14

67

<Branch box unit operation monitor function> [When option part ‘A-Control Service Tool (PAC-SK52ST)’ is connected to branch box controller board (CNM)]

Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of error code by controlling DIP SW2 on ‘A-Control Service Tool’. Operation indicator SW2 : Indicator change of self diagnosis

The black square (■) indicates a switch position.

SW2 setting

1ON23456

Display detail

(Be sure that 1 to 6 in the SW2 are set to OFF.)

(1) Display when the power supply is ON. When the power supply is ON, blinking displays by turns. Wait for 2 minutes at the longest. (2) When the display lights (Normal operation) 1The number of connected indoor units to this branch box (0 - 5)

Explanation for display Unit

1 second

interval

LED1

1ON23456

(Lighting)

Pipe temperature / Liquid (TH3) – 40~90

Discharge temperature (TH4) 3~217

Output step of outdoor FAN 0~15

Unit number of this branch box 1~2

SW2

(Initial setting)

1ON23456

– 40~90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When –10:; 0.5 secs. 0.5 secs. 2 secs.

10

3~217 (When the discharge thermistor detects 100: or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 105:; 0.5 secs. 0.5 secs. 2 secs.

1

05

0~15

1 or 2 w Omit the figures after the decimal fractions.

:

Step

code

display

1ON23456

Compressor operating frequency 0~225

LEV-A opening pulse 0~500

0~255 (When it is 100Hz or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 125Hz; 0.5 secs. 0.5 secs. 2 secs.

1

25

0~500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 150 pulse; 0.5 secs. 0.5 secs. 2 secs.

1

50

68

.Hz

Pulse

SW2 setting

1ON23456

Display detail

LEV-B opening pulse 0~500

The black square (■) indicates a switch position.

Explanation for display

0~500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 150 pulse; 0.5 secs. 0.5 secs. 2 secs.

1

50

Unit

Pulse

1ON23456

LEV-C opening pulse 0~500

LEV-D opening pulse 0~500

LEV-E opening pulse 0~500

Capacity setting indoor-A 0~14

Capacity setting indoor-B 0~14

Capacity setting indoor-C 0~14

Capacity setting indoor-D 0~14

Capacity setting indoor-E 0~14

0~500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 150 pulse; 0.5 secs. 0.5 secs. 2 secs.

1

50

0~500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 150 pulse; 0.5 secs. 0.5 secs. 2 secs.

1

50

0~500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 150 pulse; 0.5 secs. 0.5 secs. 2 secs.

1

50

Code display

(Not Qj)

2

3

4

5

6

7

8

9

10

11

12

13

Rated

capacity

22

25

28

32

35

40

45

50

56

60

71

80

Pulse

Code

display

Code

display

Code

display

Code

display

Code

display

1ON23456

Indoor pipe temperature / Liquid TH2 Indoor-A – 39~88

– 39~88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.)

69

:

SW2 setting

1ON23456

Display detail

Indoor pipe temperature / Liquid TH2 Indoor-B – 35~88

The black square (■) indicates a switch position.

Explanation for display

– 35~88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.)

Unit

:

1ON23456

Indoor pipe temperature / Liquid TH2 Indoor-C – 39~88

Indoor pipe temperature / Liquid TH2 Indoor-D – 39~88

Indoor pipe temperature / Liquid TH2 Indoor-E – 39~88

LEV-1 opening pulse 0~500

LEV-2 opening pulse 0~500

– 39~88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.)

0~500

:

Pulse

1ON23456

LEV-3 opening pulse 0~500

LEV-4 opening pulse 0~500

LEV-5 opening pulse 0~500

Outdoor pipe temperature / 2-phase (TH6) – 39~88

Outdoor outside temperature (TH7) – 39~88

0~500

– 39~88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.)

Pulse

:

70

SW2 setting

1ON23456

Display detail

Outdoor heatsink temperature (TH8) – 40~200

The black square (■) indicates a switch position.

Explanation for display Unit

– 40~200 (When the temperature is 0: or less, “–” and temperature are displayed by turns.) (When the thermistor detects 100: or more, hundreds digit, tens digit and ones digit are displayed by turns.)

:

1ON23456

LEV-6 opening pulse 0~500

LEV-7 opening pulse 0~500

LEV-8 opening pulse 0~500

High pressure o 10 (63HS) 0~500

Input current 0~50

0~500

0~500 (When it is 100 or more, hundreds digit, tens digit and ones digit are displayed by turns.)

0~50

Pulse

of/f

A

1ON23456

Indoor pipe temperature / Cond. / Eva. TH5 Indoor-A

Indoor pipe temperature / Cond. / Eva. TH5 Indoor-B

Indoor pipe temperature / Cond. / Eva. TH5 Indoor-C

Indoor pipe temperature / Cond. / Eva. TH5 Indoor-D

Indoor pipe temperature / Cond. / Eva. TH5 Indoor-E

– 39~88

:

– 39~88

:

– 39~88

:

– 39~88

:

– 39~88

:

71

SW2 setting

1ON23456

Display detail

Branch pipe temperature TH-A

– 39~88

The black square (■) indicates a switch position.

Explanation for display

Unit

:

1ON23456

Branch pipe temperature TH-B

Branch pipe temperature TH-C

Branch pipe temperature TH-D

Branch pipe temperature TH-E

TH1 Indoor-A 8~39

– 39~88

:

– 39~88

:

– 39~88

:

– 39~88

:

8~39

:

1ON23456

TH1 Indoor-B 8~39

TH1 Indoor-C 8~39

TH1 Indoor-D 8~39

TH1 Indoor-E 8~39

8~39

:

8~39

:

8~39

:

8~39

:

72

SW2 setting

1ON23456

Display detail

Indoor - setting temperature 16~31 Indoor-A

The black square (■) indicates a switch position.

Explanation for display Unit

16~31

:

1ON23456

Indoor - setting temperature 16~31 Indoor-B

Indoor - setting temperature 16~31 Indoor-C

Indoor - setting temperature 16~31 Indoor-D

Indoor - setting temperature 16~31 Indoor-E

16~31

:

16~31

:

16~31

:

16~31

:

73

9-9. SELECTING FUNCTIONS USING THE REMOTE CONTROLLER

Each function can be set according to necessity using the remote controller. The setting of function for each unit can only be done by the remote controller. Select function available from the table 1. (1) Functions available when setting the unit number to 00

W1 The functions table below are available only when P-series indoor unit and the wired remote controller is used. W2 After the power supply returns, the indoor unit does not operate for 3 minutes (Some kind of indoor units operate for 30

seconds, after that, it stops for 3 minutes). Above operation is normal.

<Table 1> Function selections

Function

Power failure automatic recovery Indoor temperature detecting

LOSSNAY connectivity

Power supply voltage Frost prevention temperature Humidifier control

OFF ON +2 Average data from each indoor unit Data from the indoor unit with remote controller Data from main remote controller Not supported Supported Supported 240V 220V,230V 2 (Normal) 3 When the compressor operates, the humidifier also operates. When the fan operates, the humidifier also operates.

(Indoor unit does not intake outdoor air through LOSSNAY (Indoor unit intakes outdoor air through LOSSNAY)

Meaning of "Function setting" Mode02:indoor temperature detecting

Settings

Mode No.

01

02

)

03

04

15

16

Setting No.

: Initial setting

(when sent from the factory)

1 2 1 2 3 1 2 3 1 2 1 2 1 2

Remarks

The setting is applied to all the units in the same refrigerant system.

No

Indoor temperature(ta)=

No.1

Average data of the sensor on all the indoor units

No.2

The data of the sensor on the indoor unit that is connected with remote controller

No.3

The data of the sensor on main remote controller

OUTDOOR

INDOOR

REMOTE (MAIN)

Initial

ta=(A+B)/2 ta=(A+B)/2 ta=A ta=A

INDOOR

REMOTE (SUB)

OUTDOOR

INDOOR

REMOTE (MAIN)

INDOOR

REMOTE (SUB)

OUTDOOR

INDOOR

REMOTE (MAIN)

REMOTE (SUB)

setting

ta=A ta=B ta=A ta=A

ta=C ta=C ta=C ta=C

OUTDOOR

INDOOR

REMOTE (MAIN)

74

10 ELECTRICAL WIRING

External wiring procedure (Fig.1)

E Power supply: Single phase 220/230/240V, 50Hz 220V, 60Hz, Max. Permissive system Impedance : 0.22(") Note: 1 Power supply input: Outdoor unit only. Connect the lines (C), (D) in accordance with the terminal block names to ensure

correct polarity.

2 As for lines (C), S1 and S2 are for connecting the power source. And S2 and S3 are for signals. S2 is a common cable for

the power source and signal.

Wire diameter Breaker

(A) Main power line

(B) Earth line

6.0 mm² 6.0 mm²

(C) Signal line/

Earth line

1.5 mm²+1/

Min. 1.5 mm²

(D) Signal line/

Earth line

1.5 mm²/

Min. 1.5 mm²

Interrupting current

40 A

When using twisted wire for the wiring, the use of round terminal is required. w1 Max 45 m (“Outdoor unit-Branch box #1” plus “branch box #1-Branch box #2”). If 2.5 mm² used, Max 55 m. Notes: 1. Wiring size must comply with the applicable local and national code.

2. Power supply cords and Indoor unit/Branch box/Outdoor unit connecting cords shall not be lighter than polychloro prene sheathed flexible cord. (Design 60245 IEC 57)

3. Install an earth line longer than power cables.

Warning:

There is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power is energized. If isolator should be used between indoor unit, branch box and outdoor unit, please use 3-pole type.

Performance characteristic

40 A, 30 mA

for 0.1sec. or less

(In case of 2- branch boxes)

Outdoor unit

(A)



Circuit breaker

(A)

(B)

Fig.1

Warning:

Branch box #1 (5- branch type)

TB3A

S1 S2

L N

(C)

S1 S2 S3

(C)

S3

TB3BTB2B

S1

S2

S3

TB3C

S1 S2 S3

TB3D

S1 S2 S3

TB3E

S1 S2 S3

TB3A

S1 S2 S3

(D)

Indoor unit

S1 S2 S3

A ROOM

B ROOM

C ROOM

D ROOM

E ROOM

F ROOM

Be sure to connect the power supply cords and connecting wires for the indoor units, outdoor units, branch boxes directly to the units (no intermediate connections). Intermediate connections can lead to communication errors in the cords or wires and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point. (If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cords and wires.)

IMPORTANT Make sure that the current leakage breaker is one compatible with higher harmonics. Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter. The use of an inadequate breaker can cause the incorrect operation of inverter.

TB3B

S1

TB2

S2

S1

S3

S2 S3

TB3C

S1 S2 S3

Branch box #2 (3- branch type)

(D)

S1 S2 S3

G ROOM

H ROOM

75

11 WIRING SPECIFICATIONS

Warning:

In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power is energized. If isolator should be used between outdoor unit and branch box / indoor units and branch box, please use 3-pole type.

Power supply

Isolator (Switch)

S1

Outdoor unit

<CAUTION> After using isolator, be sure to turn off and on the main power supply to reset the system. Otherwise, outdoor unit may not be able to detect the branch box(es) or indoor units.

S2

S3

3 poles isolator (Switch)

S1

S2

S3

Branch - box

S1

S2

S3

S1

"A-Control"

S2

Indoor unit

S3

WIRING SPECIFICATIONS (OUTDOOR-BRANCH BOX CONNECTING CABLE)

Cross section of cable

Round

Flat

Wire size (A) Number of wires Polarity L (m) + 6

2.5 3

2.5

1.5

3

4

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

Not applicable (Because center wire has no cover finish)

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

(50)

+ 2

Not applicable

+ 5

(45)

+ 3

Round

+ 1 : Power supply cords of appliances shall not be lighter than design 60245 IEC or 60227 IEC. + 2 : In case that cable with stripe of yellow and green is available. + 3 : In case of regular polarity connection (S1-S2-S3), wire size is 1.5 + 4 : In case of regular polarity connection (S1-S2-S3). + 5 : In the flat cables are connected as this picture, they can be used up to 55 m. + 6 : Mentioned cable length is just a reference value.

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

2.5

4

Clockwise : S1-S2-S3-Open

+

Connect S1 and S3 to the opposite angle.

mm2.

S1 S2 S3

(55)

+ 4

(3C Flat cable % 2)

Be sure to connect the outdoor-branch box / indoor units-branch box connecting cables directly to the units (no intermediate connections). Intermediate connections can lead to communication errors if water enters the cables and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point. (If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)

76

12 SYSTEM CONTROL

12-1. BASIC SYSTEMS

OC : Outdoor unit

OC

BC (5- branch type)

ABCDE

ICIC IC IC IC

RC

RCRCR

BC : Branch box IC : Indoor unit RC : Remote controller

BC

(3- branch type)

ABC

IC IC

IC

R

C

R

C

ABCDEABC

ICRCIC IC

12-2. STANDARD SYSTEMS

12-2-1. Only 3-branch type 12-2-3. 2-branch boxes (3-branch type)12-2-2. Only 5-branch type

OC

BC (3- branch type)

AB C

OC

BC(5- branch type)

ABCDE

NOTE: The indoor units can be

OC

BC (5- branch type)

RC

connected to any of the 5 connectors (5- branch type) or 3 connectors (3- branch type) of the branch box.

(3- branch type)

BC

R C

OC

BC(3- branch type)

ABC

IC

R

C

BC(3- branch type)

ABC

IC

R

R C

C

IC

R C

IC

R C

IC

R

C

R

C

12-2-4. 2-branch boxes (5-branch type, maximum 8 indoor units)

OC

BC (5- branch type)

ABCDE

IC

R

C

R

C

BC (5- branch type)

ABCDE

IC

R

C

R

C

IC

R

C

1. Up to 2 branch boxes can be connected to a single outdoor unit.

2. Up to 8 indoor units can be connected to the system.

IC

R

C

IC

R

C

IC

77

12-3. INCORRECT SYSTEMS

12-3-1. Group operation by single remote controller

OC

BC

(3- branch type)

AB C

IC

RC

• Plural indoor units cannot be operated by a single remote controller.

12-3-2. Group operation between different refrigerant systems

BC

AB C

IC

RC

IC IC

R C

OC OC

(3- branch type)

BC (3- branch type)

AB C

IC IC

R C

• Different refrigerant systems cannot be connected together.

12-3-3. Connection of M-NET adapter to outdoor unit

OC

BC (3- branch type)

AB C

IC

RC RC

• A M-NET adapter cannot be connected to an outdoor unit.

IC IC

ADP

001

M-NET

R C

Master controller (G-50. etc.)

Power supply unit

78

13 REFRIGERANT PIPING TASK

13-1. ADDITIONAL REFRIGERANT CHARGE



L

b1

b2



H

h1

a1

h2

a4a3a2

a6a5

a7 a8



  

h3

Total piping length

Permissible length (one-way)

Permissible height difference (one-way)

Number of bends

+1 Branch box should be placed with in the level between the outdoor unit and indoor units.

Farthest piping length (L) Piping length between outdoor unit and

branch boxes Farthest piping length after branch box (I) Total piping length between branch

boxes and indoor units In indoor / outdoor section (H) +1

In branch box / indoor unit section (h1) In each branch unit (h2) In each indoor unit (h3)



b1 + b2 + a1+ a2 + a3 + a4 + a5 + a6 + a7 + a8  115 m b2 + a8  70m (b2  55m, a8  15m)

b1 + b2  55m

a8 15m

a1+ a2 + a3 + a4 + a5 + a6 a7 + a8  60m

H  30m (In case of that outdoor unit is set higher than indoor unit) H  20m (In case of that outdoor unit is set lower than indoor unit) h1 + h2  15m

h2  15m h3 12m

| b1 + a1 |,| b1 + a2 |,| b1 + a3 |,| b1 + a4 |,| b1 + a5 |,| b2 + a6 |, | b2 + a7 |,| b2 + a8 |  15





I



Outdoor unit



Branch box



Indoor unit

• Additional charging is not necessary for this unit if the total pipe length (b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8) does not exceed 40 m.

• If the total pipe length exceeds 40 m, charge the unit with additional R410A refrigerant according to the permitted pipe lengths in the chart on the next page.

After charging the unit with refrigerant, note the added refrigerant amount on the service label (attached to the unit).

Refer to the “installation manual” for more information.

79

<Table 1> Total piping length

(b1+ b2 + a1+ a2 + a3 + a4 + a5 + a6 + a7 + a8)

Additional refrigerant charging amount

+ Reference (for service)

The amount of refilling refrigerant charge

If connecting an indoor unit with :9.52 liquid pipes (model number 71 or more for M-and S-series and model number 60 or more for P-series), the additional refrigerant charging amount in Table 1 must be corrected (add the following R value from the value given in Table 1).

Additional refrigerant charging correction amount R=0.01 [kg/m] % :9.52 branch pipe (liquid pipe) total length [m]

Example) b1 = 20m, b2 = 25m

Indoor unit A Indoor unit B Indoor unit C Indoor unit D

Total piping length : b1 + b2 + a1 + a2 + a6 + a7 = 95m © According to Table 1, the additional refrigerant charging amount is 3.2kg. Because indoor units with :9.52 liquid pipes are connected (indoor units A and D in this example), the additional refrigerant charging amount must be corrected.

Additional refrigerant charging correction amount R = 0.01 [kg/m] % :9.52 branch pipe (liquid pipe) total length (a1 + a7)

= 0.01 % (12 + 13m) = 0.25kg

:9.52 liquid pipe :6.35 liquid pipe :6.35 liquid pipe :9.52 liquid pipe

40m or less

0kg (no need)

8.5kg

(8.5 + 0)

a1 = 12m a2 = 11m a6 = 14m a7 = 13m

41 – 50m 51 – 70m 71 – 90m 91 – 115m

0.6kg

9.1kg

(8.5 + 0.6)

1.4kg 2.2kg 3.2kg

9.9kg

(8.5 + 1.4)

10.7kg

(8.5 + 2.2)

(8.5 + 3.2)

11. 7kg

Therefore, the additional refrigerant charging amount is 3.2kg + 0.25kg = 3.45kg.

+ Reference The refilling amount of refrigerant at servicing

Example) 3.45 + 8.5 = 11.95kg The amount of refrigerant of initial charge (8.5kg) is added.

Refrigerant collection when relocating the indoor and outdoor units (Pump down)

1 Connect gauge manifold valve (pressure gauge included) to the service port near the gas stop valve of the outdoor unit so

that the refrigerant pressure can be measured.

2 Turn on the power supply (circuit breaker). 3 Close the liquid stop valve, and then perform the test run for cooling operation (SW4-1 : ON and SW4-2 : OFF).

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.

4 Fully close the gas stop valve when the pressure reading on the gauge drops to 0.05–0.00MPa*

* If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0.5

use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated.

5 Stop the air conditioner operation (SW4-1 : OFF and SW4-2 : OFF). 6 Turn off the power supply (circuit breaker).

(approximately 0.5–0.0 o/f)

o/f

. If this occurs,

80

13-2. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE

13-2-1. Introduction

R410A refrigerant of this air conditioner is non-toxic and non-flammable but leaking of large amount from an indoor unit into the room where the unit is installed may be deleterious. To prevent possible injury, the rooms should be large enough to keep the R410A concentration specified by KHK: (a high pressure gas safety association) installation guidelines S0010 as follows.

Maximum concentration Maximum refrigerant concentration of R410A of a room is 0.3 kg/K accordance with the installation guidelines. To facilitate calculation, the maximum concentration is expressed in units of O/K ( kg of R410A per K)

Maximum concentration of R410A: 0.3O/K

(KHK installation guidelines S0010)

Outdoor unit

Direction of refrigerant flow

Branch box

(2) Calculate room volumes (m³) and find the room

with the smallest volume

The part with represents the room with the smallest volume.

(a) Situation in which there are no partitions

(b) There are partitions, but there are openings that allow

the effective mixing of air.

Branch box

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

All refrigerant of this system will leak out to this room if there is leakage at this indoor unit.

13-2-2. Confirming procedure of R410A concentration

Follow (1) to (3) to confirm the R410A concentration and take appropriate treatment, if necessary.

(1) Calculate total refrigerant amount by each refrig-

erant system. Total refrigerant amount is precharged refrigerant at ex-factory plus additional charged amount at field installation.

Note: When single refrigeration system consists of several independent refrigeration circuit, figure out the total refrigerant amount by each independent refrigerant circuit.

Indoor unit

Opening

Wall

(c) If the smallest room has mechanical ventilation appa-

ratus that is linked to a household gas detection and alarm device, the calculations should be performed for the second smallest room.

Branch box

Ventilation apparatus

The smallest room

The second smallest room

(situation in which there are no door openings or in which there are openings above and below doors that occupy at least 0.15% of the floor area)

Outdoor unit

Indoor unit

(3) Use the results of calculations (1) and (2) to cal-

culate the refrigerant concentration:

Total refrigerant in the refrigerating unit (O) [ Maximum concentration (O/K) The smallest room in which an indoor unit has been installed (K) Maximum concentration of R410A:0.3O/K

If the calculation results do not exceed the maximum concentration, perform the same calculations for the larger second and third room, etc., until it has been determined that the maximum concentration does not exceed in each room.

81

14 DISASSEMBLY PROCEDURE

OUTDOOR UNIT : MXZ-8A140VA/ MXZ-8A140VA1/ MXZ-8A140VA2/ MXZ-8A140VA3

OPERATING PROCEDURE

1. Removing the service panel and top panel (1) Remove 3 service panel fixing screws (5 × 10) and slide

the hook on the right downward to remove the service panel.

(2) Remove screws (3 for front, 3 for rear/5 × 10) of the top

panel and remove it.

2. Removing the fan motor (MF1, MF2)

(1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.) (3) Remove 5 fan grille fixing screws (5 × 10) to detach the fan

grille. (See Figure 1.)

(4) Remove a nut (for right handed screw of M6) to detach the

propeller. (See Photo 1.)

(5) Disconnect the connectors, CNF1 and CNF2 on controller

circuit board in electrical parts box.

(6) Remove 4 fan motor fixing screws (5 × 25) to detach the

fan motor. (See Photo 2.)

Figure 1

Grille fixing screws

Photo 1

Nut

PHOTOS & ILLUSTRATION

Top panel fixing screws

Slide

Front panel

Propeller

Photo 2

Fan motor fixing screws

Top panel

Service panel

Fan grille

Service panel fixing screws

Fan motor

3. Removing the electrical parts box (1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.) (3) Disconnect the indoor/outdoor connecting wire from termi-

nal block.

(4) Remove all the following connectors from controller circuit board;

fan motor, thermistor <Outdoor pipe>, thermistor <Discharge>, thermistor <Outdoor 2-phase pipe>, thermistor <Outdoor>, high pressure switch, high pressure sensor, low pressure switch, solenoid valve coil <4-way valve> and solenoid valve coil <Hot gas bypass>, solenoid valve coil <Returning oil bypass>. Then remove a screw (4 × 8) from the valve bed to remove the lead wire. Pull out the disconnected wire from the electrical parts box.

• Fan motor (CNF1, CNF2)

• Thermistor <Outdoor pipe> (TH3)

• Thermistor <Discharge> (TH4)

• Thermistor <Outdoor 2-phase pipe, Outdoor> (TH7/6)

• High pressure switch (63H)

• High pressure sensor (63HS)

• Low pressure switch (63L)

• Solenoid valve coil <4-way valve> (21S4)

• Solenoid valve coil <Bypass valve> (SV1)

• Solenoid valve coil (Returning oil bypass) <Bypass valve> (SV2) (5) Remove the terminal cover and disconnect the compressor

lead wire.

(6) Remove an electrical parts box fixing screw (4 × 10) and

detach the electrical parts box by pulling it upward. The electrical parts box is fixed with 2 hooks on the left and 1 hook on the right.

Fan motor fixing screws

Photo 3

Controller circuit board (C.B.)

Electrical parts box

Electrical parts box fixing screw

Terminal block (TB1)

Valve bed

Compressor (MC)

Terminal cover

Screw

Cover panel (Front)

Cover panel fixing screws

82

OPERATING PROCEDURE PHOTOS

4. Removing the thermistor <Outdoor 2-phase pipe> (TH6)

(1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.) (3) Disconnect the connectors, TH6 and TH7 (red), on the con-

troller circuit board in the electrical parts box.

(4) Loosen the clamp for the lead wire in the rear of the electrical

parts box.

(5) Pull out the thermistor <Outdoor 2-phase pipe> (TH6) from

the sensor holder.

Note: In case of replacing thermistor <Outdoor 2-phase pipe>

(TH6), replace it together with thermistor <Outdoor> (TH7) since they are combined together. Refer to No.5 below to remove thermistor <Outdoor>.

5. Removing the thermistor <Outdoor> (TH7)

(1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.) (3) Disconnect the connector TH7 (red) on the controller cir-

cuit board in the electrical parts box.

(4) Loosen the clamp for the lead wire in the rear of the elec-

trical parts box. (See Photo 4.)

(5) Pull out the thermistor <Outdoor> (TH7) from the sensor

holder.

Photo 4

Controller circuit board (C.B.)

w This connecter is not equipped with MXZ-8A140VA1/VA2/VA3.

Photo 5

Thermistor <Outdoor 2-phase pipe>

(TH6)

Clamp

MXZ-8A140VA/VA1/VA2

Note: In case of replacing thermistor <Outdoor> (TH7),

replace it together with thermistor <Outdoor 2-phase pipe> (TH6), since they are combined together. Refer to No.4 above to remove thermistor <Outdoor 2-phase pipe>.

6. Removing the thermistor <Outdoor pipe> (TH3) and thermistor <Discharge> (TH4)

(1) Remove the service panel. (See Figure 1.) (2) Disconnect the connectors, TH3 (white) and TH4 (white),

on the controller circuit board in the electrical parts box.

(3) Loosen the clamp for the lead wire in the rear of the electri-

cal parts box. (See Photo 4.)

(4) Pull out the thermistor <Outdoor pipe> (TH3) and thermis-

tor <Discharge> (TH4) from the sensor holder.

Lead wire of thermistor <Outdoor> (TH7)

Photo 6

Thermistor <Outdoor pipe> (TH3)

Sensor holder

MXZ-8A140VA3

Sensor holder

83

Compressor (MC)

Thermistor <Discharge> (TH4)

OPERATING PROCEDURE

PHOTOS

7. Removing the solenoid valve coil <4-way valve> (21S4)

(1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.)

[Removing the solenoid valve coil <4-way valve>] (3) Remove 4-way valve solenoid coil fixing screw

(M5 × 6 for MXZ-8A140VA

(1), M4 × 6 for MXZ-8A140VA2/3).

(4) Remove the solenoid valve coil <4-way valve> by sliding

the coil toward you.

(5) Disconnect the connector 21S4 (green) on the controller

circuit board in the electrical parts box.

8. Removing the 4-way valve

(1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.) (3) Remove 3 valve bed fixing screws (4 × 10) and 4 ball

valve and stop valve fixing screws (5 × 16) and then remove the valve bed.

(4) Remove 4 right side panel fixing screws (5 × 10) in the

rear of the unit and then remove the right side panel.

(5) Remove the solenoid valve coil <4-way valve>.

(See Photo 7.) (6) Recover refrigerant. (7) Remove the welded part of 4-way valve.

Note 1: Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing

the right side panel.

Note 3: When installing the 4-way valve, cover it with a wet

cloth to prevent it from heating (120°C or more), then braze the pipes so that the inside of pipes are not oxidized.

9. Removing solenoid valve coil <Bypass valve> (SV1) and

bypass valve

(1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.) (3) Remove the electrical parts box. (See Photo 4.) (4) Remove 3 right side panel fixing screws (5 × 10) in the rear

of the unit and remove the right side panel. (5) Remove the bypass valve coil fixing screw (M4 × 6). (6) Remove the solenoid valve coil <Bypass valve> (SV1) by

sliding the coil upward. (7) Recover refrigerant. (8) Remove the welded part of bypass valve.

Note 1: Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing

the right side panel.

Photo 7

Photo 8

4-way valve

Solenoid valve coil <4-way valve> (21S4)

Solenoid valve coil <4-way valve> fixing screw

Solenoid valve coil <Bypass valve> (Returning oil bypass) (SV2)

10. Removing solenoid valve coil (Returning oil bypass)

<Bypass valve> (SV2) and bypass valve

(1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.) (3) Remove the electrical parts box. (See Photo 4.) (4) Remove 3 right side panel fixing screws (5 × 10) in the rear

of the unit and remove the right side panel. (5) Remove the bypass valve coil fixing screw (M5 × 6). (6) Remove the solenoid valve coil (Returning oil bypass)

<Bypass valve> (SV2) by sliding the coil upward. (7) Recover refrigerant. (8) Remove the welded part of bypass valve.

Note 1: Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing

the right side panel.

84

Solenoid valve coil <Bypass valve> (SV1)

Bypass valve (SV1)

Bypass valve (SV2)

OPERATING PROCEDURE

11. Removing the high pressure switch (63H) and low pressure switch (63L)

(1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.) (3) Remove the electrical parts box. (See Photo 4.) (4) Remove 3 right side panel fixing screws (5 o 10) in the

rear of the unit and remove the right side panel.

(5) Pull out the lead wire of high pressure switch and low

pressure switch. (6) Recover refrigerant. (7) Remove the welded part of high pressure switch and low

pressure switch.

Note 1: Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing

the right side panel.

Note 3: When installing the high pressure switch and low

pressure switch, cover them with a wet cloth to prevent them from heating (100 °C or more), then braze the pipes so that the inside of pipes are not oxidized.

12. Removing the high pressure sensor (63HS)

(1) Remove the service panel. (See Figure 1.) (2) Remove the top panel. (See Figure 1.) (3) Remove the electrical parts box. (See Photo 4.) (4) Remove 3 right side panel fixing screws (5 o 10) in the

rear of the unit and remove the right side panel. (5) Pull out the lead wire of high pressure sensor. (6) Recover refrigerant. (7) Remove the welded part of high pressure sensor.

Photo 9

High pressure switch (63H)

PHOTOS

Low pressure switch (63L)

High pressure sensor (63HS)

Note 1: Recover refrigerant without spreading it in the air. Note 2: The welded part can be removed easily by removing

the right side panel.

Note 3: When installing the high pressure sensor, cover it

with a wet cloth to prevent it from heating (100°C or more), then braze the pipes so that the inside of pipes are not oxidized.

85

BRANCH BOX : PAC-AK50BC PAC-AK30BC

PAC-AK51BC PAC-AK31BC

OPERATING PROCEDURE

1. Removing the controller cover and under panel

(1) Remove 3 controller cover fixing screws (4 o 10) to detach

the cover. (See Photo 1.)

(2) Remove 6 under panel fixing screws (4 o 10) to remove

the panel. (See Photo 1.)

2. Removing the drain pan

(1) Remove the under panel. (See Photo 1.) (2) Remove the drain hose. (3) Incline the side of the drain pan that faces the piping to

remove the pan.

w When removing the drain pan, be careful with

remaining water on the pan. Also, be careful not to make cracks on the pan.

PHOTOS

Photo 1

Under panel fixing screws

Controller cover fixing screws

Photo 2

3. Removing the thermistors (TH-A–E)

(1) Remove the controller cover. (See Photo 1.) (2) Remove the under panel. (See Photo 1.) (3) Pull out the thermistors, TH-A–E, from the sensor holders

mounted on the gas pipe. (See Photo 3.)

(4) Pull out those thermistors through the U-shaped hole to

the board side.

(5) Loosen the side clamps of the board and disconnect the

connectors on the board.

Drain pan

Photo 3

Sensor holder

U-shaped hole

86

OPERATING PROCEDURE

4. Removing the LEV coil (LEV-A–E)

(1) Remove the controller cover. (See Photo 1.) (2) Remove the under cover. (See Photo 1.) (3) Remove 4 separator fixing screws (4 o 10) in the side of

the branch box. (See Photo 4.) (4) Tilt the separator to the board side. (See Photo 4.) (5) Loosen the side clamps of the board and disconnect the

connectors on the board. (6) Pull out the lead wire through the U-shaped hole.

(See Photo 3.) (7) Cut the band that fixes the lead wire to pull out the

LEV coil (LEV-A –E). (See Photo 5.)

PHOTOS

Photo 4

Separator fixing screws

Separator

Photo 5

Separator LEV coil

Band

87

15 PARTS LIST (non-RoHS compliant)

15-1. FUNCTIONAL AND ELECTRICAL PARTS MXZ-8A140VA MXZ-8A140VA

1

MXZ-8A140VA2

22

1

2

23

32

21

20

19

18

3031

29

28

27262524

17

3

16

15

14

13

12

11

10

56

4

7

8

9

No.

1

2

3

4

Part No.

R01 E41 221

R01 E44 221

R01 E01 115

R01 E02 097

T7W E08 242

Part Name

FAN MOTOR

PROPELLER

NUT

SOLENOID VALVE COIL

Specification

88

Q'ty/set

MXZ-8A140

1 VA 2VA

VA

2

1

Wiring

Remarks

2

1

Diagram

Symbol

MF1, MF2

SV1

Recom-

mended

Q'ty

Part numbers that are circled are not shown in the figure.

No.

5

6

7

8

9

10

11

12

13

14

15

16

17

Part No. Part Name Specification

T7W E05 428

R01 E12 428

T7W E04 208

R01 E06 413

T97 410 742

R01 E09 410

T7W E05 411

R01 E09 411

R01 E03 450

SOLENOID VALVE (SV1)

HIGH PRESSURE SENSOR

CHARGE PLUG

COMPRESSOR

STOP VALVE

BALL VALVE

STRAINER

ANB33FDCMT

3/8

5/8

T7W E14 440

R01 E34 440

ACCUMULATOR

T7W E01 490

R01 E09 490

R01 E22 425

R01 E03 428

R01 E11 428

T7W E00 242

T7W E10 242

R01 25T 209

OIL SEPARATOR

CAPILLARY TUBE

SOLENOID VALVE (SV2)

SOLENOID VALVE COIL

LOW PRESSURE SWITCH

2.5 % 0.8 % 1000

R01 E06 403

R01 E24 403

18

FOUR-WAY VALVE

R01 E26 403

T7W A01 242

19

T7W E29 242

T7W E02 208

20

R01 E04 208

R01 E75 202

21

T7W E43 202

R01 E78 408

22

T7W E24 315

23

R01 H77 310

T7W E07 346

24

T7W E14 346

T7W E16 716

25

26

T7W E01 234

27

T7W E03 259

28

T7W E09 259

T7W E12 313

29

T7W E26 313

R01 E65 202

30

T7W E00 233

31

T7W E01 233

T7W E02 259

32

T7W 520 239

33

R01 E02 239

T7W E05 254

34

T7W E09 254

R01 E00 201

35

R01 E66 202

36

R01 E21 425

37

T7W K01 608

38

–

SOLENOID VALVE COIL

(FOUR-WAY VALVE)

HIGH PRESSURE SWITCH

THERMISTOR

(OUTDOOR 2PHASE PIPE, OUTDOOR)

HEAT EXCHANGER

CONTROLLER CIRCUIT BOARD

NOISE FILTER CIRCUIT BOARD

TERMINAL BLOCK

6P(L, N, , S1, S2, S3)

ELECTRICAL PARTS BOX

RESISTOR

REACTOR

POWER CIRCUIT BOARD

THERMISTOR (HEATSINK)

ACTIVE FILTER MODULE

RELAY

FUSE

250V 6.3A

MAIN SMOOTHING CAPACITOR

THERMISTOR (DISCHARGE)

THERMISTOR (OUTDOOR PIPE)

CAPILLARY TUBE (SV2)

4 % 2.4 % 250

INS ASSY

89

Q'ty/set

MXZ-8A140

VA VA1

1

2

1

4

1

VA2

1

2

1

(BK00B055G26)

1

4

1

Remarks

Wiring

Diagram

Symbol

SV1

63HS

MC

SV2

63L

21S4

63H

TH6, TH7

C.B.

C.B

N.F.

TB1

RS

DCL

P. B .

TH8

ACTM

52C

FUSE1~4

CE

TH4

TH3

Recom-

mended

Q'ty

15-2. FUNCTIONAL PARTS BRANCH BOX : PAC-AK50BC

1

2

3

4

20

19

5

6

7

18

17

16 15

14 13

12

11

10

8

9

90

Part numbers that are circled are not shown in the figure.

No.

1

2

3

4

5

Part No.

T7W E04 641

T7W E05 689

T7W E07 689

T7W E13 661

R01 E16 242

6

T7W E18 529

7

T7W E01 669

8

T7W E04 689

9

T7W E01 527

10

R01 H48 310

11

T7W E38 202

12

T7W E39 202

13

T7W E40 202

14

T7W E41 202

15

T7W E42 202

16

T7W E13 401

17

T7W E01 419

18

T7W E00 660

19

T7W E09 689

20

T7W E14 716

21

T7W E23 716

22

R01 E02 239

23

Part Name

TOP PANEL

COVER-L

COVER-G

SIDE PANEL

LEV COIL

–

SEPARATOR

DRAIN PAN

UNDER PANEL

CONTROLLER COVER

DRAIN HOSE

CONTROLLER BOARD

THERMISTOR-A

THERMISTOR-B

THERMISTOR-C

THERMISTOR-D

THERMISTOR-E

LEV ASSY

HEADER-G ASSY

PIPE COVER (SET)

COVER-U

TERMINAL BLOCK

FUSE

Specification

3P(S1, S2, S3)

250V 6.3A

Q'ty/set

PAC-AK50BC

1

5

1

5

1

Remarks

(RG02N539G06)

Wiring

Diagram

Symbol

LEV-A–E

B.C

TH-A

TH-B

TH-C

TH-D

TH-E

TB2B

TB3A–E

F1

Recommended

Q'ty

91

15-3. FUNCTIONAL PARTS BRANCH BOX : PAC-AK30BC

1

2

3

4

18

17

5

16

15

14 13

12

11

6

10

7

8

9

92

Part numbers that are circled are not shown in the figure.

Part No. Part Name SpecificationNo.

T7W E04 641

1

T7W E06 689

2

T7W E08 689

3

T7W E14 661

4

R01 E16 242

5

6

T7W E18 529

7

T7W E01 669

8

T7W E04 689

9

T7W E01 527

10

R01 H48 310

11

T7W E38 202

12

T7W E39 202

13

T7W E40 202

14

T7W E14 401

15

T7W E02 419

16

T7W E00 660

17

T7W E09 689

18

T7W E14 716

19

T7W E23 716

20

R01 E02 239

21

Q'ty/set

Remarks

PAC-AK30BC

TOP PANEL

COVER-L

COVER-G

SIDE PANEL

LEV COIL

–

SEPARATOR

DRAIN PAN

UNDER PANEL

CONTROLLER COVER

DRAIN HOSE

CONTROLLER BOARD

THERMISTOR-A

THERMISTOR-B

THERMISTOR-C

LEV ASSY

HEADER-G ASSY

PIPE COVER (SET)

COVER-U

TERMINAL BLOCK

FUSE

3P(S1, S2, S3)

250V 6.3A

1

3

1

(RG02N539G06)

1

3

1

Wiring

Diagram

Symbol

LEV-A–C

TH-A

TH-B

TH-C

TB2B

TB3A–C

Recommended

Q'ty

B.C

F1

93

15-4. STRUCTURAL PARTS MXZ-8A140VA MXZ-8A140VA

1

2

MXZ-8A140VA2

3

17

18

16

1315 14

12

9

No.

1

2

3 4 5 6

7

8 9

10

11

12

13 14 15 16 17 18

Part No.

R01 E02 662 T7W E02 662 T7W E02 691 T7W E02 667

R01 E14 686 R01 E07 130 R01 E25 130

R01 30L 655 R01 E00 658 R01 E13 658 R01 E01 658 R01 E11 658 T7W E12 661 R01 E24 661 T7W E03 668

R01 E01 698 R01 E04 641 R01 E00 655

45678

9

11

10

Part Name

–

– –

F.ST SCREW

SIDE PANEL (L)

FAN GRILLE FRONT PANEL SEPARATOR BASE ASSY

MOTOR SUPPORT

VALVE BED ASSY HANDLE

COVER PANEL (FRONT)

COVER PANEL (REAR)

SIDE PANEL (R)

SERVICE PANEL LABEL (BRAND) LABEL (MITSUBISHI) REAR GUARD TOP PANEL HANDLE

Specification

(5×10)

Q,ty/set

MXZ-8A140

VA, VA1

38

1

2 1 1 1 1

1 2 1

1

1 1 1 1 1 1

VA2

38

1 2 1 1 1

1 1 2

1

1 1 1 1 1 1 1

Remarks

(Drawing No.)

(DG12F536H10)

(BK00C143G80)

(BK00C142G15)

(JG79C259H01) (DG79R130H01)

Wiring

Diagram

Symbol

Recom-

mended

Q,ty

94

16 RoHS PARTS LIST

16-1. STRUCTURAL PARTS MXZ-8A140VA

2 MXZ-8A140VA3

1

2

3

17

18

16

1315 14

12

9

No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Part No.

RoHS

G

T7W E03 662

G

T7W E03 691

G

T7W E06 667

G

R01 E31 686

G

R01 E27 130

G

R01 E01 655

G

R01 E13 658

G

R01 E11 658

G

R01 E32 661

G

T7W E08 668

G

R01 E07 698

G

R01 E14 641

G

R01 E02 655

G

–

45678

Part Name

F.ST SCREW

SIDE PANEL (L)

FAN GRILLE

FRONT PANEL

SEPARATOR

BASE ASSY

MOTOR SUPPORT

VALVE BED ASSY

HANDLE

COVER PANEL (FRONT)

COVER PANEL (REAR)

SIDE PANEL (R)

SERVICE PANEL

LABEL (BRAND)

LABEL (MITSUBISHI)

REAR GUARD

TOP PANEL

HANDLE

Specification

(5×10)

9

10

Q'ty/set

MXZ-8A140VA2/3

38

1

2

1

2

1

Remarks

(Drawing No.)

(DG12F536H10)

(BK00C143G99)

(BK00C142G15)

(JG79C259H01)

(DG79R130H01)

11

Wiring

Diagram

Symbol

Recommended

Q'ty

95

16-2. FUNCTIONAL AND ELECTRICAL PARTS MXZ-8A140VA

2

MXZ-8A140VA3

22

1

23

32

31

21

30

29

28

27262524

2

20

19

18

17

3

16

15

14

13

12

No.

1

2

3

4

Part No.

RoHS

R01 E44 221

G

T7W E27 763

G

R01 E08 115

G

R01 E09 097

G

T7W E32 242

G

T7W E38 242

G

56

4

Part Name

FAN MOTOR

PROPELLER FAN

NUT

SOLENOID VALVE COIL

7

8

Specification

96

9

Q'ty/set

MXZ-8A140

VA2 VA3

2

1

2

1

11

10

Remarks

Wiring

Diagram

Symbol

MF1, MF2

SV1

Recom-

mended

Q'ty

Part numbers that are circled are not shown in the figure.

No.

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

33

34

35

36

37

38

Part No.

RoHS

R01 E15 428

G

R01 E07 208

G

R01 E14 413

G

T97 415 779

G

R01 E13 410

G

R01 E11 411

G

R01 E06 450

G

R01 E36 440

G

R01 E12 490

G

R01 E26 425

G

R01 E13 428

G

T7W E31 242

G

R01 E00 209

G

R01 E26 403

G

R01 E32 403

G

T7W E29 242

G

R01 E06 208

G

R01 E94 202

G

R01 E91 408

G

R01 H77 310

G

T7W E53 315

G

T7W E16 346

G

R01 E18 346

G

T7W E29 716

G

—

R01 E00 234

R01 E20 259

T7W E31 313

R01 E64 313

R01 E99 202

R01 E09 233

R01 E07 233

T7W E10 259

R01 E06 239

R01 E20 254

R01 E09 201

T7W E03 201

R01 H00 202

R01 E27 425

T7W K01 608

Part Name

Specification

SOLENOID VALVE (SV1)

HIGH PRESSURE SENSOR

CHARGE PLUG

COMPRESSOR

STOP VALVE

BALL VALVE

ANB33FDSMT

3/8

5/8

STRAINER

ACCUMULATOR

OIL SEPARATOR

CAPILLARY TUBE

2.5 % 0.8 % 1000

SOLENOID VALVE (SV2)

SOLENOID VALVE COIL

LOW PRESSURE SWITCH

FOUR-WAY VALVE

SOLENOID VALVE COIL (FOUR-WAY VALVE)

HIGH PRESSURE SWITCH

THERMISTOR(OUTDOOR 2PHASE PIPE, OUTDOOR)

HEAT EXCHANGER

CONTROLLER CIRCUIT BOARD

NOISE FILTER CIRCUIT BOARD

TERMINAL BLOCK

6P(L, N, , S1, S2, S3)

ELECTRICAL PARTS BOX

RESISTOR

REACTOR

POWER CIRCUIT BOARD

THERMISTOR (HEATSINK)

ACTIVE FILTER MODULE

RELAY

FUSE

250V 6.3A

MAIN SMOOTHING CAPACITOR

THERMISTOR (DISCHARGE)

THERMISTOR (OUTDOOR PIPE)

CAPILLARY TUBE (SV2)

4 % 2.4 % 250

INS ASSY

Q'ty/set

MXZ-8A140

VA

2 VA 3

1

2

1

4

1

2

1

(BK00B055G26)

(BK00B055G32)

1

4

1

Remarks

Wiring

Diagram

Symbol

63HS

MC

SV2

63L

21S4

63H

TH6, TH7

C.B.

N.F.

TB1

RS

DCL

P. B .

TH8

ACTM

52C

FUSE1~4

CB

TH4

TH3

Recom-

mended

Q'ty

97

16-3. FUNCTIONAL PARTS BRANCH BOX : PAC-AK50BC PAC-AK51BC

1

2

3

4

20

19

5

6

7

18

17

16 15

14 13

12

11

10

8

9

98

Part numbers that are circled are not shown in the figure.

10

11

12

13

14

15

16

17

18

19

20

21

22

23

RoHS

R01 E22 641

G

1

R01 E11 689

G

2

R01 E13 689

G

3

R01 E35 661

G

4

R01 E36 242

G

5

G

6

R01 E33 529

G

7

R01 E02 669

G

8

T7W E02 669

G

R01 E16 689

G

9

T7W E11 689

G

R01 E07 527

G

R01 H80 310

G

T7W E93 310

G

R01 H20 202

G

R01 H21 202

G

R01 H22 202

G

R01 H23 202

G

R01 H24 202

G

R01 E98 401

G

R01 E09 419

G

R01 E01 660

G

R01 E15 689

G

R01 E31 246

G

R01 E20 246

G

R01 E06 239

G

R01 E14 239

Q'ty/set

Part No. Part Name SpecificationNo.

PAC-AK

Remarks

50BC 51BC

TOP PANEL

COVER-L

COVER-G

SIDE PANEL

LEV COIL

–

SEPARATOR

DRAIN PAN

UNDER PANEL

1

5

1

UNDER PANEL

CONTROLLER COVER

1

CONTROLLER COVER

DRAIN HOSE

CONTROLLER BOARD

1

CONTROLLER BOARD

THERMISTOR-A

THERMISTOR-B

THERMISTOR-C

THERMISTOR-D

THERMISTOR-E

LEV ASSY

HEADER-G ASSY

PIPE COVER (SET)

COVER-U

TERMINAL BLOCK

FUSE

3P(S1, S2, S3)

250V 6.3A

1

5

1

5

1

(BH00G766G04)

1

5

1

Wiring

Diagram

Symbol

LEV-A–E

B.C

TH-A

TH-B

TH-C

TH-D

TH-E

TB2B

TB3A–E

F1

Recom-

mended

Q'ty

99

16-4. FUNCTIONAL PARTS BRANCH BOX : PAC-AK30BC PAC-AK31BC

1

2

3

4

5

18

17

16

15

14 13

12

11

6

10

7

8

9

100

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

Specifications and Main Features

Frequently Asked Questions

User Manual