Mitsubishi Electric PAC-AK50BC Manuel d'utilisation

TECHNICAL & SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CONTENTS

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

2. OVERVIEW OF UNIT ··········································· 5

3. SPECIFICATIONS ················································ 8

4. OUTLINES AND DIMENSIONS ··························· 9

5. WIRING DIAGRAM ············································· 10

6. REFRIGERANT SYSTEM DIAGRAM ················· 11

7. TROUBLESHOOTING ········································ 12

8. DISASSEMBLY PROCEDURE ··························· 23

BRANCH BOX

No. OCH508

REVISED EDITION-A

HFC

utilized

R410A

April 2013

NOTE:

• This service manual

describes technical data of

branch box. As for indoor

units and outdoor unit,

refer to its service manual.

PARTS CATALOG (OCB508)

[Service Ref.]

PAC-AK50BC

PAC-AK51BC

PAC-AK52BC

PAC-AK53BC

PAC-AK30BC

PAC-AK31BC

PAC-AK32BC

Revision:

• PAC-AK53BC and PAC-

AK32BC have been added

in REVISED EDITION-A.

• Some descriptions have

been modified.

• Please void OCH508.

[Model name]

PAC-AK50BC

PAC-AK51BC

PAC-AK52BC

PAC-AK53BC

PAC-AK30BC

PAC-AK31BC

PAC-AK32BC

(Indispensable optional parts for MXZ-8A series and MXZ-8B series. )

1 SAFETY PRECAUTION

Cautions for units utilizing refrigerant R410A

1-1. ALWAYS OBSERVE FOR SAFETY

Use new refrigerant pipes.

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 refrigerant other than R410A.

If other refrigerant (R22 etc.) is used, chlorine in refrige-

rant 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.

Handle tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that can

cause deterioration of refrigerant oil or malfunction of com-

pressor.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigera-

nt will change and the efficiency will be lowered.

Flare tool

Electronic refrigerant

charging scale

Vacuum pump adaptor

Size adjustment gauge

Gauge manifold

Torque wrench

Gas leak detector

Charge hose

Tools for R410A

Contamination inside refrigerant piping can cause deterio-

ration of refrigerant oil etc.

If dirt, dust or moisture enters into refrigerant cycle, that can

cause deterioration of refrigerant oil or malfunction of com-

pressor.

If large amount of mineral oil enters, that can cause deterio-

ration of refrigerant oil etc.

Store the piping indoors, and both ends of the

piping sealed until just before brazing.

(Leave elbow joints, etc. in their packaging.)

Make sure that the inside and outside of refrige-

rant 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.

The refrigerant oil applied to flare and flange

connections must be ester oil, ether oil or

alkylbenzene oil in a smalll amount.

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the

unit is being used, serviced, or disposed of.

Correct refrigerant is specified in the manuals and on the

spec labels provided with our products.

We will not be held responsible for mechanical failure,

system malfunction, unit breakdown or accidents caused

by failure to follow the instructions.

Use the specified refrigerant only. Ventilate the room if refrigerant leaks during

operation. If refrigerant comes into contact with

a flame, poisonous gases will be released.

1-2. CAUTIONS RELATED TO NEW REFRIGERANT

Before obtaining access to terminal, all supply

circuit must be disconnected.

OCH508A

Gravimeter

Unit

[3] Service tools

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

[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.

No. Tool name Specifications

1Gauge manifold

· Only for R410A

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

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

2Charge hose · Only for R410A

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

3Electronic scale

4Gas leak detector · Use the detector for R134a, R407C or R410A.

5Adaptor for reverse flow check · Attach on vacuum pump.

6Refrigerant charge base

7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)

· Cylinder with syphon

8Refrigerant recovery equipment

OCH508A

(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.)

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 refriger-

ants. Therefore, to enhance airtightness and intensity, flare cutting dimension of copper pipe for R410A has been speci-

fied 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.

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

1/4

3/8

1/2

5/8

3/4

6.35

9.52

12.70

15.88

19.05

0.8

1.0

—

0.8

1.0

Nominal

dimensions(inch)

Diagram below: Piping diameter and thickness

Outside

diameter (mm)

Thickness (mm)

R410A R22

1/4

3/8

1/2

5/8

3/4

6.35

9.52

12.70

15.88

19.05

9.1

13.2

16.6

19.7

—

9.0

13.0

16.2

19.4

23.3

Nominal

dimensions(inch)

Flare cutting dimensions

Outside

diameter

Dimension A ( )

-0.4

(mm)

R410A R22

1/4

3/8

1/2

5/8

3/4

6.35

9.52

12.70

15.88

19.05

17.0

22.0

26.0

29.0

—

17.0

22.0

24.0

27.0

36.0

Nominal

dimensions(inch)

Flare nut dimensions

Outside

diameter

Dimension B

(mm)

R410A R22

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 thermis-

tor vacuum gauge and

vacuum valve

Charging cylinder

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 refri-

gerant to thermistor vacuum gauge)

Refrigerant charge

Tool exclusive for R410A

Tool for HFC refrigerant

Tool exclusive for R410A

Ester oil and alkylbenzene

oil (minimum amount)

Tool exclusive for R410A

Tools for other refrigerants can

be used if equipped with adop-

ter 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

Tool exclusive for R410A

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

(Usable if equipped

with adopter for rever-

se flow)

(Usable by adjusting

flaring dimension)

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)

: 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.

Dimension A

Dimension B

OCH508A

2 OVERVIEW OF UNIT

Indoor unit (Ceiling concealed type)

Indoor unit

(Wall mounted type)

Outdoor unit Branch Box

2-1. 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 microprocessor, the Branch Box can trans-

late the transmission signal of indoor units to achieve the optimum control.

2-1-1. System example

2-1-2. Method for identifying

■ Outdoor unit

M X Z – 8 B 140 V A

Model type

Power supply

V: Single phase 220/230/240V 50Hz

Y: 3-Phase 380/400/450V 50Hz

Multi type heat pump

inverter outdoor unit

Indicates equivalent to rated cooling capacity.

(0.1kW)

Number of connectable indoor units (MAX.)

Control and refrigerant

A : New A control and R410A

Branch box (Controller)

Number of branches

5 : 5 branches

3 : 3 branches

Model type

Symbol of factory

Applicable refrigerant

A : R410A

P A C – A K 5 2 BC

(Indispensable)

Optional parts

■ Branch box

OCH508A

2-2. INSTALLATION

2-2-1. Space required for Installation and servicing for Branch box.

(1) Front View (Fig. 2-1)

A Branch box

B On the side of piping

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

C For indoor installations

D Ceiling board

E Maintenance hole

F PCB side

*1: A minimum 350 mm is required for 90° bends in refrigerant piping.

*2: 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).

*3: B is “ □ 600”.

In the case of “ □ 450”, prepare a maintenance hole at a PCB side as it is shown in Fig. 2-3, and “Min. 300 mm” is needed

as distance A.

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. 2-4)

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.





450

Min. 250

Min.

(1)





(3)

Min. 250

450 





280

Min.

250

Min.

250

198 Min. 30

180-200





B

(2)

Fig. 2-4

Fig. 2-3Fig. 2-2

Fig. 2-1

unit : mm

OCH508A

BB B BB

Branch box

■ In case of using 1-branch box

Flare connection employed (No brazing)

BB BBB

2 branches pipe (joint)

: optional parts

Branch box #1

Branch box #2

■ In case of using 2-branch boxes

■ Installation procedure (2 branch pipe (joint))

Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.

2-3. SIMPLIFIED PIPING SYSTEM

Piping connection size

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!)

OCH508A

3 SPECIFICATIONS

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

Width

Depth

Height

Branch (indoor side)*

Main (outdoor side)

To indoor unit

To outdoor unit

Liquid

Gas

Liquid

Gas

MAX. 3

8.1

:6.35 3 {A,B,C}

:9.52 3 {A,B,C}

MAX. 5

9.3

:6.35 5 {A,B,C,D,E}

:9.52 4 {A,B,C,D}, :12.7 % 1{E}

PAC-AK50BC

PAC-AK51BC

PAC-AK52BC

PAC-AK53BC

PAC-AK30BC

PAC-AK31BC

PAC-AK32BC

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

0.003

0.05

Galvanized sheets

O.D.20 (VP-16)

450

280

198

:9.52

:15.88

Each 3-wire, plus earth wire

3-wire, plus earth wire

PAC-AK50BC PAC-AK51BC PAC-AK52BC PAC-AK53BC

PAC-AK30BC PAC-AK31BC PAC-AK32BC

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

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.)

OCH508A

4 OUTLINES AND DIMENSIONS

unit: mm

PAC-AK50BC PAC-AK51BC PAC-AK52BC PAC-AK53BC

TB2B

TB3D

TB3E

TB3ATB3B

TB3C

SUSPENSION BOLT : W3/8 (M10)

REFRIGERANT PIPE FLARED CONNECTION (inch)

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

LIQUID PIPE

GAS PIPE

ABCDE

TO OUTDOOR UNIT

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

1/2 5/8

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

SUSPENSION BOLT PITCH

320

402

24 SUSPENSION BOLT PITCH

95 280 39

61 79 50 34

3-ELECTRIC WIRE INLET

3-WIRE BAND

ELECTRIC COVER

TO OUTDOOR UNIT

SERVICE PANEL

(for LEV, THERMISTOR)

TERMINAL BLOCK

TO INDOOR UNIT

TERMINAL BLOCK

TO OUTDOOR UNIT

TO INDOOR UNIT

198

65 39

25 25 25 25 25 21

75 75 75 75

EDCBA

200

:20

DRAIN PIPE CONNECTION

(VP-16)

FLEXIBLE DRAIN HOSE

(ACCESSORY)

450

SUSPENSION BOLT : W3/8 (M10)

REFRIGERANT PIPE FLARED CONNECTION (inch)

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

LIQUID PIPE

GAS PIPE

ABC

TO OUTDOOR UNIT

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

5/8

3/8 3/8 3/8

3-ELECTRIC WIRE INLET

3-WIRE BAND

ELECTRIC COVER

TO OUTDOOR UNIT

SERVICE PANEL

(for LEV, THERMISTOR)

TERMINAL BLOCK

TO INDOOR UNIT

TERMINAL BLOCK

TO OUTDOOR UNIT

TO INDOOR UNIT

DRAIN PIPE CONNECTION

(VP-16)

FLEXIBLE DRAIN HOSE

(ACCESSORY)

SUSPENSION BOLT PITCH

320

402

TB3C

TB2B

TB3B TB3A

61 79 50 34

280

703568

205

198

65 39

25 25 25 21

75 75

200

:20

CBA

450

Type A

:20

Type B

200

DRAIN PIPE CONNECTION

(VP-16)

FLEXIBLE DRAIN HOSE

(ACCESSORY)

Type A

:20

Type B

200

DRAIN PIPE CONNECTION

(VP-16)

FLEXIBLE DRAIN HOSE

(ACCESSORY)

PAC-AK30BC PAC-AK31BC PAC-AK32BC

OCH508A

YLW

TB3E

(PAC - AK50/51/52/53BC only)

* Setup of SW1

Make it the same setup as former

when exchanging PCB.

TO INDOOR

UNIT -E

(PAC - AK50/51/52/53BC only)

TO INDOOR

UNIT -D

TO INDOOR

UNIT -C

TO INDOOR

UNIT -B

TO INDOOR

UNIT -A

TO OUTDOOR

UNIT

ORN

BRN

TB3E

(GRN)

YLW

ORN

BRN

TB3D

(BLK)

YLW

ORN

BRN

TB3C

(BLU)

YLW

ORN

BRN

TB3B

(RED) LEV-A

(WHT)

YLW

ORN

BRN

TB3A

(WHT)

YLW

TB1

ORN

BRN

CN3C

(BLU)

CND

(ORN)

1 2 34567

10 11 12 13 14

CNM

SW1 *

LED1 LED2 LED3 LED4 LED5

6LEV-A

LEV-B

(RED)

6LEV-B

LEV-C

(BLU)

6LEV-C

LEV-D

(BLK)

6LEV-D

LEV-E

(GRN)

TH-A

(WHT)

TH-B

(RED)

TH-C

(BLU)

TH-D

(BLK)

TH-E

(GRN)

6LEV-E

TH-A

TH-B

TH-C

TH-D

TH-E

TB3D

TB3C

TB3B

TB3A

TB2B

Note : " PAC - AK30 . 50BC, PAC - AK31 . 51BC, PAC-AK32 . 52BC, PAC-AK53BC " is only for R410A.

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.

SYMBOL

B.C

SW1

B.C

CNM

B.C

LED1~5< B.C>

TB3A

TB3B

TB3C

TB3D

TB3E

LEV-A~E

TH-A~E

TB2B

Branch box controller board

Fuse 250V 6.3A

Switch for service

Connector

Light emitting diode

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

Linear expansion valve

Thermistor

Pipe temp.detection / Gas

(

0 / 15k, 25  / 5.4k

)

Terminal block / To outdoor unit

NAME

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

B.C

(PAC - AK50/51/52/53BC only)

OFF

The black square (■) indicates a switch position.

5 WIRING DIAGRAM

PAC-AK50BC PAC-AK51BC PAC-AK52BC PAC-AK53BC

PAC-AK30BC PAC-AK31BC PAC-AK32BC

OCH508A

Ce manuel convient aux modèles suivants

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