Mitsubishi MUZ-A18YV, MUZ-A24YV, MUZ-A26YV Service Manual

SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

HFC

utilized

R410A

Revision A:

● MUZ-A18YV - can be connected to MCFZ-A18WV - .

● MUZ-A24YV - can be connected to MCFZ-A24WV - .

Please void OB346.

E1

Wireless type Models

MUZ-A18YV MUZ-A24YV MUZ-A26YV -

No. OB346

REVISED EDITION-A

E1

CONTENTS

NOTE:

This service manual describes technical data of the outdoor units.

•As for indoor units MSZ-A18YV - , MSZ-A24YV - and MSZ-A26YV - , refer to the service manual OB345.

•As for indoor units MCFZ-A18WV - and MCFZ-A24WV - , refer to the service manual

OB344 REVISED EDITION-A.

Indication of model name

MUZ-A18YV MUZ-A24YV MUZ-A26YV -

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················5

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES·······························8

E1

5. OUTLINES AND DIMENSIONS·························9

6. WIRING DIAGRAM ··········································10

7. REFRIGERANT SYSTEM DIAGRAM··············12

8. PERFORMANCE CURVES······························14

9. ACTUA TOR CONTROL····································29

10. TROUBLESHOOTING······································30

11. DISASSEMBLY INSTRUCTIONS ·····················44

12. PARTS LIST······················································48

E1E1E1

E1E1

1

Refrigerating

oil

Refrigerant

New refrigerant

R410A

HFC-32: HFC-125 (50%:50%)

Pseudo-azeotropic refrigerant

Not included

A1/A1

72.6

-51.4

1.557 64

Non combustible

0

1730

From liquid phase in cylinder

Possible

Incompatible oil

Non Non

Previous refrigerant

R22

R22 (100%)

Single refrigerant

Included

A1

86.5

-40.8

0.94

44.4

Non combustible

0.055 1700

Gas phase

Possible

Compatible oil

Light yellow

Non

Refrigerant Composition (Ratio) Refrigerant handling Chlorine Safety group (ASHRAE) Molecular weight Boiling point (:) Steam pressure [25:](Mpa) Saturated steam density [25:](Kg/K) Combustibility ODP w1 GWP w2 Refrigerant charge method Additional charge on leakage Kind Color Smell

w1:Ozone Destruction Parameter : based on CFC-11 w2 :Global Warmth Parameter : based on CO

2

New Specification Current Specification

The incompatible refrigerating oil easily separates from refrigerant and is in the upper layer inside the suction muffler. Raising position of the oil back hole enables to back the refrigerating oil of the upper layer to flow back to the compressor.

Since refrigerant and refrigerating oil are compatible each, refrigerating oil backs to the compressor through the lower position oil back hole.

Compressor

Suction muffler

Oil back hole

Refrigerating oil

Refrigerant

Compressor

Suction muffler

Oil back hole

Refrigerating oil /Refrigerant

Compressor

TECHNICAL CHANGES

INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

• This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer.

• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 air conditioners.

1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/

materials are required. Refer to the table below.

2 Take sufficient care not to allow water and other contaminations to enter the R410Arefrigerant during storage and

installation, since it is more susceptible to contaminations than R22.

3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant

piping.)

4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent

composition change.

NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).

The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])

2

Conversion chart of refrigerant temperature and pressure

R410A tools Can R22 tools be used?

Gas leak detector

R410A has high pressures beyond the measurement range of existing gauges. Port diameters have been changed to prevent any other refrigerant from being charged into the unit.

Hose material and cap size have been changed to improve the pressure resistance.

Dedicated for HFC refrigerant.

6.35 mm and 9.52 mm

Description

Clamp bar hole has been enlarged to reinforce the spring strength in the tool. Provided for flaring work (to be used with R22 flare tool).

Provided to prevent the back flow of oil. This adapter enables you to use vacuum pumps.

It is difficult to measure R410A with a charging cylinder because the refrigerant bubbles due to high pressure and high-speed vaporization

No

Yes

New

Gauge manifold

Charge hose

Torque wrench

Flare tool Flare gauge

Vacuum pump adapter

Electronic scale for refrigerant charging

No : Not Substitutable for R410A Yes : Substitutable for R410A

No 12.7 mm and 15.88mm

Wall thickness

Outside diameter

Pipe

mm

For liquid

For gas

6.35

9.52

12.7

15.88

0.8 mm

1.0 mm

Heat resisting foam plastic Specific gravity 0.045 Thickness 8 mm

Insulation material

(MPa [Gauge])

4.0

3.5

3.0

2.5

2.0

1.5

R410A R22

NOTE : The unit of pressure has been changed to MPa on the

international system of units(SI unit system).

1.0

0.5

Saturated liquid pressure

0.0

-0.5

-30 -20 -10 0 10 20

30

40 50 60

The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])

(:)

1.Tools dedicated for the air conditioner with R410A refrigerant

The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools. The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.

2.Refrigerant piping

1 Specifications

Use the refrigerant pipes that meet the following specifications.

• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88). Never use any pipe with a thickness less than 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88), as the pressure resistance is insufficient.

3

Electronic scale for refrigerant charging

Outdoor unit

Refrigerant gas cylinder operating valve

Refrigerant gas cylinder for R410A with siphon

Refrigerant (liquid)

Service port

Gauge manifold valve (for R410A)

Union

Liquid pipe Gas pipe

Stop valve

Indoor unit

Charge hose (for R410A)

R410A

Pipe diameter

mm

6.35

9.52

12.7

15.88

17 22 26 29

Dimension of flare nut

R22

17 22 24 27

2 Flaring work and flare nut

Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”.

3.Refrigerant oil

Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.

4.Air purge

• Do not discharge the refrigerant into the atmosphere. Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant

circuit.

• Use the vacuum pump for air purging for the purpose of environmental protection.

5.Additional charge

For additional charging, charge the refrigerant from liquid phase of the gas cylinder. If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the outdoor unit. In this case, ability of the refrigerating cycle decreases or normal operation can be impossible. However, charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.

4

2

PART NAMES AND FUNCTIONS

MUZ-A18YV MUZ-A24YV MUZ-A26YV -

E1 E1 E1

OUTDOOR UNIT

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

3

Electrical

Coefficient of performance(C.O.P) ✽1

Fan

Special

NOTE : Test conditions are based on ISO 5151.

SPECIFICATION

Outdoor model

Function

Power supply

Capacity Rated frequency(Min.~Max.) Dehumidification Air flow(High/LowW)

Capacity

Power outlet Running current Power input Power factor Starting current ✽1

data

Compressor motor current ✽1 Fan motor current

Model Output Winding resistance(at 20:)

Compressor

Model Winding

motor

resistance(at 20:) Dimensions WOHOD Weight Sound level(High/LowW) Fan speed(High/LowW) Fan speed regulator Refrigerant filling capacity(R410A) Refrigerating oil(Model)

remarks

Thermistor RT61(at 100:) Thermistor RT62(at 25:) Thermistor RT65(at 50:) Thermistor RT68(at 25:)

Cooling : Indoor DB 27: WB 19:

Outdoor DB 35: WB (24:)

Heating : Indoor DB 20: WB 15:

Outdoor DB 7: WB 6: Refrigerant piping length (one way): 5m ✽1 Measured under rated operating frequency. w Reference value

kW

r/h

K /h

A

A W %

A

W

"

mm

kg

dB

rpm

kg cc

k" k" k" k"

ACCESSORIES

1

2

MUZ-A18YV -

Indoor model

MSZ-A18YV -

Cooling

Single phase

230V,50Hz

5.0(0.9~5.9)

2.5

2,940/1,650

1,500

WHT-RED 15.2 RED-BLK15.2

53/51

800/480

W

6.62

98.5

6.32

3.21 SNB130FLDH

U-V 0.45 W-U 0.45

V-W 0.45

PM8H60-UB

BLK-WHT 15.2

840o850o330

W

450 (NEO22)

5.9(0.9~7.8)

2,940/2,210

20

7.38

0.30

850

53

2

1.8

13.4

10.0

17.0

10.0

5

Drain socket Drain cap [33

E1

Heating

—

W

7.38

1,670

98.4

7.08

3.41

W

55/53

800/620

W

MUZ-A18YV MUZ-A24YV MUZ-A26YV -

MUZ-A18YV -

Indoor model

MCFZ-A18WV -

Cooling

Single phase

230V,50Hz

4.8(10.9~5.5)

2.4

2,940/1,650

1,750

WHT-RED 15.2 RED-BLK15.2

53/51

800/480

W

7.76

7.46

2.62 SNB130FLDH

U-V 0.45 W-U 0.45

V-W 0.45

PM8H60-UB

BLK-WHT 15.2

840o850o330

W

450 (NEO22)

6.0(0.9~7.5)

2,940/2,210

20

98

8.87

0.30

850

53

2

1.8

13.4

10.0

17.0

10.0

1 2

E1

Heating

—

8.87

2,000

8.57

2.88

55/53

800/620

E1 E1 E1

W

Outdoor model

Function

Cooling

Power supply

Capacity Rated frequency(Min.~Max.) Dehumidification Air flow(High/LowW)

Capacity

Power outlet Running current Power input Power factor Starting current ✽1

Electrical

data

Compressor motor current ✽1 Fan motor current

K /h

kW

r/h

A

A W %

A

6.0(0.9~6.7)

2,940/1,650

Coefficient of performance(C.O.P) ✽1

Model Output Winding resistance(at 20:)

Compressor

W

"

Model Winding

Fan

motor

resistance(at 20:) Dimensions WOHOD Weight Sound level(High/LowW) Fan speed(High/LowW)

"

WHT-RED 15.2 RED-BLK15.2

mm

kg

dB

rpm

53/51

800/480

Fan speed regulator Refrigerant filling capacity(R410A) Refrigerating oil(Model)

Special

remarks

Thermistor RT61(at 100:) Thermistor RT62(at 25:) Thermistor RT65(at 50:) Thermistor RT68(at 25:)

kg cc

k" k" k" k"

NOTE : Test conditions are based on ISO 5151.

Cooling : Indoor DB 27: WB 19:

Outdoor DB 35: WB (24:)

Heating : Indoor DB 20: WB 15:

Outdoor DB 7: WB 6: Refrigerant piping length (one way): 5m ✽1 Measured under rated operating frequency. w Reference value

E1

MUZ-A24YV -

Indoor model

E1

MSZ-A24YV -

Heating

Single phase

230V,50Hz

6.8(0.9~8.1)

3.0

W

2,940/2,210

—

20

8.49

1,921

8.75

1,981

98.4

8.75

8.19

8.45

0.30

3.02

3.32

SNB130FLDH

850

U-V 0.45 W-U 0.45

V-W 0.45

PM8H60-UB

BLK-WHT 15.2

840o850o330

53

W

55/53

800/620

W

2

1.8

450 (NEO22)

13.4

10.0

17.0

10.0

E1

MUZ-A24YV -

Indoor model

MCFZ-A24WV -

Cooling

E1

Heating

Single phase

230V,50Hz

5.5(0.9~6.1)

W

2,940/1,650

3.1

6.4(0.9~7.9)

W

2,940/2,210

—

20

10.38 2,340

10.47 2,360

98

10.47

10.08

10.17

0.30

2.27

2.62

SNB130FLDH

850

U-V 0.45 W-U 0.45

V-W 0.45

PM8H60-UB

BLK-WHT 15.2

WHT-RED 15.2 RED-BLK15.2

840o850o330

53

W

53/51

800/480

55/53

W

800/620

2

1.8

450 (NEO22)

13.4

10.0

17.0

10.0

MUZ-A26YV -

Indoor model

MSZ-A26YV -

Cooling

Single phase

230V,50Hz

7.1(0.9~8.3)

8.1(0.9~9.6)

3.8

W

2,940/1,650

W

2,940/2,210

20

10.75 2,431

98.3

11.42

10.45

0.30

2.84 TNB220FMCH

1,300

U-V 1.41 W-U 1.41

V-W 1.41

PM8H60-UB

BLK-WHT 15.2

WHT-RED 15.2 RED-BLK15.2

840o850o330

58

W

53/51

800/480

W

800/620

2

2.0

870 (NEO22)

13.4

10.0

17.0

10.0

E1

Heating

—

11.42 2,581

11.12

3.06

55/53

W

6

OUTDOOR UNIT

Model

Item

Smoothing capacitor Current transformer Current transformer Fuse Fuse Fet array High pressure switch Power transistor module Reactor Expansion valve Power factor controller Resistor Resistor Resistor Solenoid coil relay Terminal block Terminal block Relay R.V. coil

MUZ-A18YV

-

E1

(CB1,2,3)

(CT1,2)

(CT61)

(F801, F912)

(F911)

(HC932)

(HPS)

(IPM)

(L)

(LEV)

(PFC)

(R64)

(R934A,B)

(RS1~4) (SSR61)

(TB1) (TB2)

(X64)

(21S4)

MUZ-A24YV

-

E1

MUZ-A26YV

-

E1

560+ 450V ETQ19Z68AY ETQ19Z53AY

250V 3.15A

250V 1A SLA5075

PS21244-A

340µH 20A

PS51259-A

10" 20W

1.1" 2W 2%

0.04" 7W TLP3506

3P 2P

G4A

LD30013

ACB-DB156

CAM-40YGME 12VDC

–

CAM-30YGME 12VDC

Specifications and rating conditions of main electric parts

7

4

COOLING

FUNCTION

SPL(dB(A)) LINE

High

SPEED

HEATING

53 55

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

NOISE CRITERIA CURVES

MUZ-A18YV MUZ-A24YV MUZ-A26YV -

E1 E1 E1

OUTDOORUNIT

1m

MICROPHONE

8

5

OUTLINES AND DIMENSIONS

MUZ-A18YV MUZ-A24YV MUZ-A26YV -

OUTDOOR UNIT

515

299

66

51

34

330

850

430

E1 E1 E1

Unit: mm

REQUIRED SPACE

Open as a rule 500mm or more if the front and both

198

sides are open

100mm or more 200mm or more if there are obstacles to both sides

350mm or more

Service panel

Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35 (MUZ-A18/A24YV)

[9.52 (MUZ-A26YV)

30-

35-

Gas refrigerant pipe joint Refrigerant pipe (flared) [12.7 (MUZ-A18YV) [15.88 (MUZ-A24/A26YV)

121

500 840

40

100mm or more

360

Open as a rule

80

500mm or more if the back, both sides and top are open

155

90

9

6

WIRING DIAGRAM

MUZ-A18YV MUZ-A24YV -

E1 E1

OUTDOOR UNIT

W

RED

W

CT2

PFC

R

V

CB3 CB2 CB1

S

V

MC

IPM

U

WHT

CN5

21

MODELS WIRING DIAGRAM

BLK

U

CT1

RS3

RS1

27

21

CN3

RS4

RS2

CN2

RT65

POWER

LD9

LD1LD2

12

CN4 6543 1

GRN

BOARD

BLK BLK

GRY

WHT

RED

PNK

3

1

12

CN701

BLU

ORN

CN931

CN801

MF

YLW

F801

RED

R934A

T801

BLK

WHT

23134512

CN932

HC932

R934B

diagram for servicing.

refer to the indoor unit electric wiring

1.About the indoor side electric wiringNOTES:

NAME

:Terminal block :Connector

3.Symbols below indicate.

2.Use copper conductors only (for field wiring).

L

TAB1

1

2

RED

4X64

RED

TAB4

R64

F912

YLW

4

3

NF

BRN

TB1

BLK

YLW

NR63

BLU

L

BLK

21

CT61

TAB2

PE

N

BLK

CN903

21

CN902

SSR61

F911

GRN/YLW

5123

CN901

CN912

13

LDE2

LDE1

BLU BLU

GRN

BLK BLK BLK

BLK

BLK BLK BLK

21S4

ELECTRONIC

CN702 1 567

5321

CN781

1

P.C. BOARD

CONTROL

RED

3

TB2

CN795

4123 78

CN661

CN601 3

BLU

N

6

LEV

FIN TEMPERATURE THERMISTOR

OUTDOOR HEAT EXCHANGER

RT65

SYMBOL

NAME

TERMINAL BLOCK

TRANSFORMER

SOLENOID COIL RELAY

TEMPERATURE THERMISTOR

T801

RT68

SSR61

TB1

TB2

RELAY

X64

R.V. COIL

21S4

RT62 RT61 RT68

OUTDOOR FAN MOTOR (INNER FUSE)

COMPRESSOR

MF

MC

SYMBOL

NAME

VARISTOR

NOISE FILTER

RESISTOR

POWER FACTOR CONTROLLER

NF

R64

PFC

NR63

DEFROST THERMISTOR

DISCHARGE TEMPERATURE THERMISTOR

RESISTOR

RT62

RT61

RS1~4

R934A, B

CIRCUIT

BREAKER

POWER SUPPLY

~/N 230V 50Hz

NOISE FILTER

P.C. BOARD

10

TO INDOOR

UNIT

CONNECTING

12V

SMOOTHING CAPACITOR

CURRENT TRANSFORMER

FUSE (250V 1A)

FUSE (250V 3.15A)

POWER TRANSISTOR MODULE

FET ARRAY

IPM

F911

F801

F912

CT61

CT1, 2

CB1~3

SYMBOL

HC932

EXPANSION VALVE COIL

REACTOR

L

LEV

MUZ-A26YV -

OUTDOOR UNIT

E1

MODEL WIRING DIAGRAM

L

RED

W

CT2

PFC

R

1

2

S

RED

W

CB3 CB2 CB1

YLW

4

3

V

IPM

BLK

MC

CN5

21

BLK

U

BLK

WHT

U

CT1

RS3

RS1

27

BLK

21

RS4

RS2

CN3

CN2

RT65

POWER

LD9

LD1LD2

12

CN4 6543 1

GRN

BOARD

BLK BLK

BLK BLK BLK

GRY

WHT

RED

PNK

3

1

12

CN701

CN702

BLU

ORN

CN931

CN801

MF

YLW

F801

T801

CN795

WHT

RED

R934A

6

BLK

23134512

CN932

HC932

R934B

LEV

diagram for servicing.

refer to the indoor unit electric wiring

1.About the indoor side electric wiringNOTES:

NAME

OUTDOOR HEAT EXCHANGER

RT68

SYMBOL

:Terminal block :Connector

3.Symbols below indicate.

2.Use copper conductors only (for field wiring).

TERMINAL BLOCK

TRANSFORMER

SOLENOID COIL RELAY

TEMPERATURE THERMISTOR

T801

SSR61

TB1

TB2

R.V. COIL

RELAY

X64

21S4

RED

4X64

TAB4

R64

F912

NF

TAB1

BRN

CIRCUIT

BREAKER

POWER SUPPLY

~/N 230V 50Hz

TB1

YLW

NR63

BLU

L

21

CN903

CT61

TAB2

PE

N

21

CN902

SSR61

F911

GRN/YLW

5123

CN901

CN912

13

LDE2

LDE1

1 567

BLK

5321

BLK BLK BLK

BLU BLU

21S4

GRN

NOISE FILTER

P.C. BOARD

ELECTRONIC

11

CN661CN681

CN781

1

P.C. BOARD

CONTROL

RED

3

TB2

TO INDOOR

UNIT

CONNECTING

41212 378

CN601

RED

3

BLU

N

12V

RED

HPS

RT62 RT61 RT68

NAME

OUTDOOR FAN MOTOR (INNER FUSE)

COMPRESSOR

MC

SYMBOL

NAME

SMOOTHING CAPACITORCB1~3

SYMBOL

POWER FACTOR CONTROLLER

NOISE FILTER

VARISTOR

NF

MF

PFC

NR63

CURRENT TRANSFORMER

FUSE (250V 1A)

FUSE (250V 3.15A)

F911

F801

CT61

CT1, 2

DISCHARGE TEMPERATURE THERMISTOR

RESISTOR

R64 RESISTOR

R934A, B

FUSE (250V 3.15A)

FET ARRAY

F912

HC932

FIN TEMPERATURE THERMISTOR

RESISTOR

DEFROST THERMISTOR

RT62

RT61

RT65

RS1~4

EXPANSION VALVE COIL

HIGH PRESSURE SWITCH

REACTOR

POWER TRANSISTOR MODULE

L

IPM

LEV

HPS

7

Outdoor heat exchanger

Flared connection

Defrost thermistor RT62

Discharge temperature thermistor RT61

Flared connection

Stop valve

Stop valve (with service port)

Capillary tube [3.6✕[2.4✕50

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe [12.7 (MUZ-A18YV) (with heat insulator) [15.88 (MUZ-A24YV)

Refrigerant pipe [6.35 (with heat insulator)

LEV

R.V. coil heating ON cooling OFF

Muffler

#100

Strainer

#100

Receiver

Outdoor heat exchanger temperature thermistor RT68

Strainer

#100

Outdoor heat exchanger

Flared connection

Defrost thermistor RT62

Discharge temperature thermistor RT61

Flared connection

Stop valve

Stop valve (with service port)

Capillary tube [3.6✕[2.4✕50

Capillary tube [1.8✕[0.6✕1000

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe [15.88 (with heat insulator)

Refrigerant pipe [9.52 (with heat insulator)

LEV

R.V. coil heating ON cooling OFF

Oil separator

High-pressure switch

Strainer

#100

Receiver

Outdoor heat exchanger temperature thermistor RT68

Strainer

#100

Strainer

#100

REFRIGERANT SYSTEM DIAGRAM

MUZ-A18YV MUZ-A24YV -

OUTDOOR UNIT

E1

Unit:mm

MUZ-A26YV -

E1

OUTDOOR UNIT

12

Unit:mm

Refrigerant Piping Max. length A

w Height difference should be within 15m regardless of which unit, indoor or outdoor position is high.

w Max. Height

difference 15m

Indoor unit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH

Model

Piping size O.D : mm Length of connecting pipe : m

Refrigerant piping

Max. length : m

A

30

Indoor unit

Gas 0.43

Liquid 0.5

Gas

12.7

15.88

Liquid

6.35

9.52

MUZ-A18YV - E1

MUZ-A24YV - E1 MUZ-A26YV - E1

Outdoor unit

Gas 0

Liquid 0

Model

MUZ-A18YV -

E1

Refrigerant piping length (one way)

Outdoor unit

precharged

1,800

15m

160

20m

260

25m

360

30m

460

7m

0

10m

60

Model

MUZ-A24YV -

E1

Refrigerant piping length (one way)

15m

160

20m

260

25m

360

7m

0

10m

60

Outdoor unit

precharged

1,800

30m

460

Outdoor unit

precharged

2,000

0 165 440 715 990 1,265

Refrigerant piping length (one way)

15m10m7m

Model

MUZ-A26YV -

E1

20m

25m 30m

MAX. HEIGHT DIFFERENCE

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

Calculation : Xg=20g/m ✕ (Refrigerant piping length (m)–7)

Calculation : Xg=55g/mo(Refrigerant piping length(m)-7)

13

PERFORMANCE CURVES8

MUZ-A18YV MUZ-A24YV MUZ-A26YV -

E1 E1 E1

The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions.

Since operating conditions vary according to the areas where these units are installed. The following information has been

provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

207 ~ 253V, 50Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature : °C WB (2) Indoor outlet air wet-bulb temperature : °C WB (3) Outdoor intake air dry-bulb temperature : °C DB (4) Total input : W

}

Cooling

(5) Indoor intake air dry-bulb temperature : °C DB (6) Outdoor intake air wet-bulb temperature : °C WB (7) Total input : W

}

Heating

Indoor air wet/dry-bulb temperature difference on the left side of the chart on this page and next page shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

How to measure the indoor air wet-bulb / dry-bulb temperature difference

1. Attach at least 2 sets of wet and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of wet and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.

2. Attach at least 2 sets of wet and dry-bulb thermometers to the outdoor air intake. Cover the thermometers to prevent direct rays of the sun.

3. Check that the air filter is cleaned.

4. Open windows and doors of room.

5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.

6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.

7. 10 minutes later, measure temperature again and check that the temperature does not change.

11.4

10.5

9.5

8.6

7.7

difference (degree)

6.8

Indoor air Wet-bulb temperature

INDOOR UNIT

Wet and dry-bulb thermometers

11.3

10.3

9.3

8.4

7.5

6.7

12.9

11.7

10.6

11.1

10.2

9.2

8.3

7.5

6.6

9.6

8.6

7.6

13.9

12.7

11.4

10.3

9.2

8.1

Indoor intake air Wet-bulb temperature (

:)

Outdoor intake air Dry-bulb temperature (:)

OUTDOOR UNIT

Wet and dry-bulb thermometers

:)

Indoor intake air Wet-bulb temperature (

Outdoor intake air Dry-bulb temperature (:)

MCFZ-A18WV - E1

MUZ-A18YV - E1

Rated frequency 84Hz

MSZ-A24YV - E1

MUZ-A24YV - E1

MSZ-A18YV - E1

MUZ-A18YV - E1

Rated frequency 73Hz

Rated frequency 88Hz

MCFZ-A24WV - E1

MUZ-A24YV - E1

Rated frequency 102Hz

MSZ-A26YV - E1

MUZ-A26YV - E1

Rated frequency 63Hz

14

28.0

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

Capacity correction factors

Input correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

( )

MUZ-A18YV -

E1

Indoor unit : MSZ-A18 YV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MSZ-A18YV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MSZ-A18YV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MSZ-A18YV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MCFZ-A18WV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MCFZ-A18WV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MCFZ-A18WV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MCFZ-A18WV -

E1

( )

MUZ-A24YV -

E1

Indoor unit : MSZ-A24YV -

E1

( )

MUZ-A24YV -

E1

Indoor unit : MSZ-A24YV -

E1

( )

MUZ-A24YV -

E1

Indoor unit : MSZ-A24YV -

E1

( )

MUZ-A24YV -

E1

Indoor unit : MSZ-A24YV -

E1

Input correction factors

Capacity correction factors

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

0 50 100 150

0.5

1.0

1.5

25.9

23.7

21.6

19.4

17.2

15.1

12.9

26.2

24.1

22.1

20.1

18.1

16.1

14.1

12.1

25.7

23.7

21.8

19.8

17.8

15.8

difference (degree)

13.8

11.9

Indoor air Dry-bulb temperature

29.9

27.6

25.3

23.0

20.7

18.4

16.1

13.8

31.2

28.8

26.4

24.0

21.6

19.2

16.8

14.4

:)

Indoor intake air Dry-bulb temperature (:)

Indoor intake air Dry-bulb temperature (

MCFZ-A18WV - E1

MSZ-A18YV - E1

MUZ-A18YV - E1

Rated frequency 82Hz

MUZ-A18YV - E1

Rated frequency 86Hz

MCFZ-A24WV - E1

MUZ-A24YV - E1

MSZ-A24YV - E1

MUZ-A24YV - E1

Rated frequency 95Hz

Rated frequency 96Hz

MSZ-A26YV - E1

MUZ-A26YV - E1

Rated frequency 65Hz

Outdoor intake air Wet-bulb temperature (:)

NOTE:The above curves are for the heating operation without any frost.

15

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

MUZ-A26YV -

E1

MUZ-A26YV -

E1

MUZ-A26YV -

E1

MUZ-A26YV -

E1

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

( )

MUZ-A24YV -

E1

Indoor unit : MCFZ-A24WV -

E1

( )

MUZ-A24YV -

E1

Indoor unit : MCFZ-A24WV -

E1

( )

MUZ-A24YV -

E1

Indoor unit : MCFZ-A24WV -

E1

( )

MUZ-A24YV -

E1

Indoor unit : MCFZ-A24WV -

E1

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

(MPa [Gauge])

(kgf/F [Gauge])

18 32

15 2050256030

70 (%)

35(˚C)

0.4

0.6

0.8

1.0

1.2

1.4 25Hz

4

6

8

10

12

14

16

1.6

Ambient temperature(˚C) Ambient humidity(%)

Outdoor low pressure

15 2050256030

70 (%)

35(˚C)

1

1.5

2

2.5

3

25Hz

32

18

Outdoor unit current(A)

Ambient temperature(˚C) Ambient humidity(%)

(MPa [Gauge])

(kgf/F [Gauge])

18 32

15 2050256030

70 (%)

35(˚C)

0.4

0.6

0.8

1.0

1.2

1.4 25Hz

4

6

8

10

12

14

16

1.6

Ambient temperature(˚C) Ambient humidity(%)

Outdoor low pressure

15 2050256030

70 (%)

35(˚C)

1

1.5

2

2.5

3

25Hz

32

18

Outdoor unit current(A)

Ambient temperature(˚C) Ambient humidity(%)

( )

MUZ-A18YV -

E1

Indoor unit : MCFZ-A18WV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MCFZ-A18WV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MSZ-A18YV -

E1

( )

MUZ-A18YV -

E1

Indoor unit : MSZ-A18YV -

E1

1. Press the EMERGENCY OPERATION switch to COOL or HEAT mode (COOL : Press once, HEAT : Press twice).

2. Test run operation starts and continue to operate for 30 minutes.

3. Compressor starts at fixed-frequency.

4. Indoor fan operates at High speed.

5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts.

6. To cancel test run operation (EMERGENCY OPERATION), press the EMERGENCY OPERATION switch or any button on remote controller.

NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system).

The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation

1 Both indoor and outdoor unit are under the

same temperature/humidity condition.

2 Air flow : High speed 3 Operational frequency : 25Hz(MUZ-A18YV)

25Hz(MUZ-A24YV) 24Hz(MUZ-A26YV)

Dry-bulb temperature

20 25 30 70

Relative humidity(%)

50 60

16

Mitsubishi MUZ-A18YV, MUZ-A24YV, MUZ-A26YV Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual