Mitsubishi Electric MXZ-8B140VA Manuale operativo

TECHNICAL & SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CONTENTS

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

2. OVERVIEW OF UNITS········································ 5

3. SPECIFICATIONS ············································· 12

4. DATA·································································· 13

5. OUTLINES AND DIMENSIONS ························16

6. WIRING DIAGRAM············································ 17

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

··· 19

8. TROUBLESHOOTING·······································21

9. ELECTRICAL WIRING······································ 54

10. WIRING SPECIFICATIONS.······························ 56

11. SYSTEM CONTROL··········································57

12. REFRIGERANT PIPING TASK··························59

13. DISASSEMBLY PROCEDURE·························· 62

INDOOR UNITS COMBINATION SHEETS

No. OCH480

REVISED EDITION-A

[Model name] [Service Ref.]

MXZ-8B140VA MXZ-8B140VA

MXZ-8B160VA MXZ-8B160VA

MXZ-8B140YA MXZ-8B140YA

MXZ-8B160YA MXZ-8B160YA

HFC

utilized

R410A

September 2011

NOTE:

• This service manual

describes technical data

of outdoor unit. As for

indoor units and branch

box(OCH508), refer to its

service manual.

• RoHS compliant products

have <G> mark on the

spec name plate.

OUTDOOR UNIT

Model name

indication

PARTS CATALOG (OCB480)

Revision:

• Errors in "3.

SPECIFICATIONS"

have been corrected in

REVISED EDITION-A.

• Some descriptions have

been modified.

• Please void OCH480.

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 to be used indoors during

installation, 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.

OCH480A

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

OCH480A

(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.

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 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 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.

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

1.0

—

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

OCH480A

2 OVERVIEW OF UNITS

2-1. CONSTRUCTION OF SYSTEM

MXZ-8B140YA/160YA

6HP

MXZ-8B140VA/160VA

5HP

14.0

16.0 15.5

18.0

R410A

Indoor unit

that can be

connected

Branch box

that can be

connected

Capacity

Refrigerant

Rated

capacity (kW) Cooling

Heating

Number of units

Total system wide capacity

Type 15 ~ Type 100

2 ~ 8 units

1 ~ 2 units

21 ~ 132 % of outdoor unit capacity (3.0 kW ~ 18.5 kW) 19 ~ 130 % of outdoor unit capacity (3.0 kW ~ 20.2 kW)

Number of units

Outdoor unit

Ceiling

concealed

4-way

ceiling cassette

Wall

mounted

Model type Model name

Deluxe

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-GE22/25/35/42/50/60/71/80VA

MSZ-GE22/25/35/42/50/60/71NA

MSZ-EF22/25/35/42/50VE

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/RP100EA2

MCFZ-GA35/50/60VA

SLZ-KA25/35/50VA(L)

PLA-RP35/50/60/71/100AA(.UK)/BA(.UK)

PLA-RP71BA2.UK

PLA-RP100BA/BA3

MFZ-KA25/35/50VA

MLZ-KA25/35/50VA

Floor standing

Capacity class (kW)

2.2 2.5 3.5 5.0 6.0 7.1 8.0

10.0*1

Connectable indoor unit lineup (Heat pump inverter type)

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

*1. When connectiing the indoor unit with the number 100, use the PAC-AK52YP-E Y-shape connection pipe (Optional part).

Branch box PAC-AK52BC

5 branches

(MAX. 5 units)

PAC-AK31BC

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.

CAUTION : The indoor unit which rated capability exceeds

10.0kW (100 type) can NOT be connected.

2.01.5 4.2

1-way ceiling cassette

OCH480A

Indoor unit (Ceiling concealed type)

Indoor unit

(Wall mounted type)

Outdoor unit Branch Box

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

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

2-2-1. System example

2-2-2. Method for identifying

■Outdoor unit

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

(Indispensable)

Optional parts

M XZ – 8 B 140 V A

PA C – A K 5 2 BC

■Branch box

OCH480A

2-3. 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-60 MSZ-35 MSZ-35 MSZ-25 MSZ-25

Living Dining Bedroom (1) Bedroom (2)

Master

bedroom

■System example of 5 indoor units

■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 as shown below.

The total indoor unit capacity should be within the outdoor units.

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.

•MXZ-8B140 3.0 ~ 18.5 kW

•MXZ-8B160 3.0 ~ 20.2 kW

Example: MXZ-8B140

Total rated capacity

18.0 18.5kW

MSZ-25 =2.5

SEZ-60 = 6.0

MSZ-35 = 3.5

MSZ-25 = 2.5

Indoor unit type (capacity class)

15 20 22 25 35 42 50 60 71 80 100

Rated capacity (cooling) (kW) 1.5 2.0 2.2 2.5 3.5 4.2 5.0 6.0 7.1 8.0 10.0

OCH480A

2-4. INSTALLATION

2-4-1. 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 malfunc-

tion 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.

2-4-2. 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 mal-

function 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)

AAir guide

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

BWind direction

Fig. 2-1

Fig. 2-2 Fig. 2-3

OCH480A

(2) When installing a single outdoor unit

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)

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

●Obstacles at front and rear only (Fig. 2-8)

wWhen 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.

150

250

1500

500

Max. 500

1000

200

300

200

Fig. 2-4

Fig. 2-8Fig. 2-7

Fig. 2-5 Fig. 2-6

Fig. 2-9

unit : mm

300

1000

Max. 500

150

1000

OCH480A

(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)

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

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

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

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

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

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

wWhen 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.

300

1500

500

1500

Max. 300

1000

600

2000

150

1500

500

1500

800

150

1500

600

3000

500

Fig. 2-14Fig. 2-13

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

Fig. 2-15

Fig. 2-16

unit : mm

OCH480A

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