Mitsubishi Electric MXZ-8B48NA Betriebsanleitung

TECHNICAL & SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CONTENTS

1. TECHNICAL CHANGE.................................... 2

2. SAFETY PRECAUTION....................................2

3. OVERVIEW OF UNITS......................................5

4. SPECIFICATIONS.............................................9

5. DATA................................................................

6. OUTLINES AND DIMENSIONS......................34

7. WIRING DIAGRAM.........................................36

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION....

9. TROUBLESHOOTING.................................... 39

10.

PRECAUTIONS AGAINST REFRIGERANT LEAKAGE

..... 79

11. DISASSEMBLY PROCEDURE....................... 81

OUTDOOR UNIT

BRANCH BOX

No. OCH468

REVISED EDITION-C

[Service Ref.]

MXZ-8B48NA

MXZ-8B48NAR1

PAC-AKA51BC

PAC-AKA31BC

Model name

indication

HFC

utilized

R410A

November 2010

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.

[Model name]

MXZ-8B48NA

PAC-AKA51BC

PAC-AKA31BC

(Indispensable optional parts

for MXZ-8B48NA)

PARTS CATALOG (OCB468)

• Please void OCH468

REVISED EDITION-B.

Revision:

• Switch setting on page 68

has been modified in

REVISED EDITION-C.

• Some descriptions have

been modified.

Cautions for units utilizing refrigerant R410A

2-1. 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.

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.

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.)

The refrigerant oil applied to flare and flange

connections must be ester oil, ether oil or

alkylbenzene oil in a small amount.

Ventilate the room if refrigerant leaks during

operation. If refrigerant comes into contact with

a flame, poisonous gases will be released.

2-2. CAUTIONS RELATED TO NEW REFRIGERANT

Before obtaining access to terminal, all supply

circuit must be disconnected.

2 SAFETY PRECAUTION

1TECHNICAL CHANGE

MXZ-8B48NA MXZ-8B48NAR1

• THERMISTOR has been changed. (Discharge thermistor ĺCompressor thermistor)

Gravimeter

Unit

[3] Service tools

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

[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.

2-3. 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.

1Thickness 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 [7/256 inch] or below.)

2Dimensions 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 its working pressure is 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 cop-

per pipe flaring dimensions for R410A below. For 1/2 and 5/8 inch, the dimension B changes.

Use torque wrench corresponding to each dimension.

3Tools 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 [1/32]

1.0 [5/128]

—

0.8 [1/32]

1.0 [5/128]

Nominal

dimensions[inch]

Diagram below: Piping diameter and thickness

Outside

diameter (mm)

Thickness (mm) [inch]

R410A R22

1/4

3/8

1/2

5/8

3/4

6.35

9.52

12.70

15.88

19.05

9.1 [11/32-23/64]

13.2 [1/2-33/64]

16.6 [41/64-21/32]

19.7 [49/64-25/32]

—

9.0

13.0

16.2

19.4

23.3

Nominal

dimensions[inch]

Flare cutting dimensions

Outside

diameter Dimension A ( )

-0.4

(mm) [inch]

R410A R22 1/4

3/8

1/2

5/8

3/4

6.35

9.52

12.70

15.88

19.05

17.0 [43/64]

22.0 [7/8]

26.0 [1-3/64]

29.0 [1-9/64]

—

17.0

22.0

24.0

27.0

36.0

Nominal

dimensions[inch]

Flare nut dimensions Outside

diameter[inch] Dimension B

(mm) [inch]

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, ether 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, ether 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

3 OVERVIEW OF UNITS

3-1. CONSTRUCTION OF SYSTEM

6HP

Rated capacity (kBTU/h)

(Cooling/Heating) 48/54

MXZ-8B48NA, MXZ-8B48NAR1

R410A

Indoor unit

that can be

connected

Branch box

that can be

connected

Capacity

Number of units

Total system wide capacity

Type 06 ~ Type 24

2 ~ 8 units

1 ~ 2 units

22.2 ~ 130 % of outdoor unit MAX. Cooling capacity (12 kBTU/h ~ 70.2kBTU/h)

Number of units

Outdoor unit

Branch box PAC-AKA51BC

5 branches

(MAX. 5 units)

PAC-AKA31BC

3 branches

(MAX. 3 units)

Number of branches

Indoor unit that

can be connected

( )

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

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

2- branch pipe (joint) : Optional parts

In case of using 1- branch box

In case of using 2- branch boxes

No need

Model name Connection method

flare

brazing

MSDD-50AR-E

MSDD-50BR-E

Option Optional accessories of indoor units and outdoor units are available.

MAX. capacity (kBTU/h)

(Cooling/Heating) 54/60

Ceiling

concealed

4-way ceiling cassette

Wall

mounted

Model type Model name

Deluxe

Standard

Low static pressure

Middle static pressure

Standard

MSZ-FE09/12, MSZ-FD09/12

MSZ-GE06/09/12/15/18/24

MSZ-GA24

MSZ-A09/12/15/17/24

SEZ-KD09/12/15/18

PEAD-A24AA

PLA-A12/18/24BA

MFZ-KA09/12/18NA

Floor standing

Capacity class [kBTU/h]

06 09 12 15 18(17) 24

Connectable indoor unit lineup (Heat pump inverter type)

<NOTE> When connecting MSZ-FE18NA model, joint pipe is necessary for both liquid and gas pipes.

Indoor unit (Ceiling concealed type)

Indoor unit

(Wall mounted type)

Outdoor unit Branch Box

3-2. SYSTEM OUTLINE

The additional connection of the Branch Box together with employment of the compact trunk-looking outdoor unit can suc-

cessfully 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

3-2-2. Method for identifying

ŶOutdoor unit

Development No. : A, B, ···,etc.

Power supply

N: Single phase 208/230V 60Hz

Multi type heat pump

inverter outdoor unit

Indicates equivalent to rated cooling capacity.

(kBTU/h)

Number of connectable indoor units (MAX.)

Control and refrigerant

A : New A control and R410A

Service No. : 1, 2, ···,etc.

M X Z-4 88B NA

P A C-A K A 5 1 B C

(Indispensable)

Optional parts

Symbol of factory

Branch box (Controller)

Number of branches

5 : 5 branches

3 : 3 branches

Applicable refrigerant

A : R410A

Marketable area

A: America

ŶBranch box

3-3. TYPICAL COMBINATION EXAMPLE

Branch box is located INSIDE of condominium

Branch box

(Inside)

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

SEZ-18 MSZ-12 MSZ-12 MSZ-09 MSZ-09

Living Dining Bedroom (1) Bedroom (2)

Master

bedroom

Indoor unit type (capacity class)

Rated capacity (cooling) (kBTU/h)

ŶSystem example of 5 indoor units

ŶVerification

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 12 ~ 70.2 kBTU/h.

The total indoor unit capacity should be within the outdoor units. (=54.0 kBTU/h 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:

Total rated capacity

60 70.2 kBTU/h

MSZ-09 = 9

SEZ-18 = 18

MSZ-12 = 12

MSZ-09 = 9

3-4. SIMPLIFIED PIPING SYSTEM

Piping connection size

Liquid

Gas

W9.52 mm

(3/8 inch)

W15.88 mm

(5/8 inch)

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!)

BB BBB

Branch box

ŶIn 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

ŶIn case of using 2-branch boxes

ŶInstallation procedure (2 branch pipe (joint))

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

4 SPECIFICATIONS

• Outdoor unit : MXZ-8B48NA/MXZ-8B48NAR1 Conversion formula: kcal/h = kW %860

Btu/h = kW %3412

CFM = m3/min %35.31

Service Ref. MXZ-8B48NA, MXZ-8B48NAR1

Standard performance

Indoor type Non-Ducted Mix Ducted

Cooling

Capacity Rated / Max (*1) Btu/h 48000 / 54000

Rated power consumption (*1) W 5780 6125 6470

EER Btu/Wh 8.30 7.84 7.42

SEER Btu/Wh 15.0 14.8 14.7

Heating

Capacity Rated / Max 47 °F (*1) Btu/Wh 54000 / 60000

Capacity 17 °F *2 Btu/Wh 36600 36550 36500

Rated power consumption 47 °F (*1) W 4820 5045 5270

COP 47 °F (*1) Btu/Wh 11.20 10.70 10.25

HSPF 4/ 5Btu/Wh 8.7 / 7.0 8.8 / 7.0 8.9 / 7.1

OUTDOOR UNIT

Connectable indoor units (Max.) 8

Max. Connectable Capacity 70200 Btu/Wh (130% of Outdoor Unit Max Capacity)

Power supply 208/230, 1, 60

Breaker Size / Max. fuse size 50A / 52A

Min. circuit ampacity 32A

Sound level (Cool/Heat) dB 54 / 55

External ¿nish Munsell 3Y 7.8/1.1

Refrigerant control Linear Expansion Valve

Compressor Hermetic

Model ANB33FDSMT

Motor output kW 2.9

Starting method Inverter

Heat exchanger Plate ¿n coil

Fan Fan (drive) × No. Propeller fan × 2

Fan motor output kW 0.086 + 0.086

AirÀow m³/min (CFM) 100 (3,530)

Dimensions

(H × W × D)

W mm (in.) 980 (37-13/32)

D mm (in.) 330+30 (13+1-3/16)

H mm (in.) 1,350 (53-5/32)

Weight kg (lbs) 126 (278)

Refrigerant R410A

Charge kg (lbs) 8.5 (18.7)

Oil / Model L (oz) 2.3 (73) / FV50S

Protection devices High pressure protection HP switch

Compressor protection Discharge thermo, Over current detection (MXZ-8B48NA)

Compressor thermo, Over current detection (MXZ-8B48NAR1)

Fan motor protection Overheating / Voltage protection

Guaranteed operation range (cool) -5 〜46 °C DB (23 ~ 115 °F DB)

(heat) -15 〜21 °C DB (5 ~ 70 °F DB)

REFRIGERANT PIPING

Total Piping length (Max.) m (ft) 115 (377)

Farthest m (ft) 70 (300)

Max. Height difference m (ft) 30 (98) (*3)

Chargeless length m (ft) 40 (131)

Piping diameter Liquid [mm (in.) [9.52 (3/8)

Gas [mm (in.) [15.88 (5/8)

Connection method Indoor side Flared

Outdoor side Flared

(*1) Rating conditions Cooling Indoor : D.B.26.7°C / W.B.19.4°C (D.B.80°F / W.B.67 °F)

Outdoor : D.B.35.0°C (95°F)

Heating Indoor : D.B.21.1°C (70°F)

Outdoor : D.B.8.3°C / W.B.6.1°C (D.B.47°F / W.B.43°F)

(*2) Conditions Heating Indoor : D.B.21.1°C (70°F)

Outdoor : D.B. - 8.3°C / W.B. - 9.4°C (D.B.17°F / W.B.15°F)

(*3) 20m (66ft) ：In case of installing outdoor unit lower than indoor unit.

Note : Refer to the service manual of indoor unit for the indoor units speci¿cations.

mm (in.)

kg (lbs)

mm (in.)

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

8.4 (19)

:6.35 (1/4) × 3 {A,B,C}

:9.52 (3/8) × 3 {A,B,C}

MAX. 5

9.6 (21)

:6.35 (1/4) × 5 {A,B,C,D,E}

:9.52 (3/8) × 4 {A,B,C,D},

:12.7 (1/2) × 1{E}

PAC-AKA51BC PAC-AKA31BC

Single phase, 208/230V, 60Hz

0.003

0.05

Galvanized sheets

O.D.20 (O.D. 3/4)

450 (17 - 3/4)

280 (11)

198 (7 - 3/4)

:9.52 (3/8)

:15.88 (5/8)

Each 3-wire, plus earth wire

3-wire, plus earth wire



• Branch box : PAC-AKA51BC PAC-AKA31BC

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.)

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