Mitsubishi MUZ-A18YV-E1, MUZ-A24YV-E1, MUZ-A26YV-E1 Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS	Revision C:
	● “Check of HPS” has been corrected.

Please void OB346 REVISED EDITION-B.

	HFC	No. OB346
		REVISED EDITION-C
SERVICE MANUAL	utilized
	R410A

Wireless type

Models

MUZ-A18YV - E1

MUZ-A24YV - E1

MUZ-A26YV - E1

CONTENTS

Indication of model name

MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1

1.TECHNICAL CHANGES ··············

2.PART NAMES AND FUNCTIONS··········

3.SPECIFICATION··················

4.NOISE CRITERIA CURVES ·············

5.OUTLINES AND DIMENSIONS···········

6.WIRING DIAGRAM ················

7.REFRIGERANT SYSTEM DIAGRAM ········

8.PERFORMANCE CURVES ·············

9.ACTUATOR CONTROL··············

10.TROUBLESHOOTING···············

11.DISASSEMBLY INSTRUCTIONS··········

12.PARTS LIST···················

NOTE:

This service manual describes technical data of the outdoor units.

•As for indoor units MSZ-A18YV - E1 , MSZ-A24YV - E1 and MSZ-A26YV - E1 , refer to the service manual OB345.

•As for indoor units MCFZ-A18WV - E1 and MCFZ-A24WV - E1 , refer to the service manual OB344.

Revision A:

•MUZ-A18YV - E1 can be connected to MCFZ-A18WV - E1 .

•MUZ-A24YV - E1 can be connected to MCFZ-A24WV - E1 .

Revision B:

• Part number of 4-WAY VALVE has been corrected.

Model	Revise point	Part Name				Part Number
			Incorrect				Correct
MUZ-A18YV - E1	12-1. No.18	4-WAY VALVE	E02	679	961		E02	891	961
MUZ-A24YV - E1	12-1. No.18	4-WAY VALVE	E02	679	961		E02	891	961
MUZ-A26YV - E1	12-1. No.18	4-WAY VALVE	E02	679	961		E02	891	961

Revision C:

• “Check of HPS ” has been corrected.

2

Refrigerant

1 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.

1As 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 R410A refrigerant during storage and installation, since it is more susceptible to contaminations than R22.

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

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

Refrigerant

Refrigerating

oil

	New refrigerant	Previous refrigerant
Refrigerant	R410A	R22
Composition (Ratio)	HFC-32: HFC-125 (50%:50%)	R22 (100%)
Refrigerant handling	Pseudo-azeotropic refrigerant	Single refrigerant
Chlorine	Not included	Included
Safety group (ASHRAE)	A1/A1	A1
Molecular weight	72.6	86.5
Boiling point (:)	-51.4	-40.8
Steam pressure [25:](Mpa)	1.557	0.94
Saturated steam density [25:](Kg/K)	64	44.4
Combustibility	Non combustible	Non combustible
ODP w1	0	0.055
GWP w2	1730	1700
Refrigerant charge method	From liquid phase in cylinder	Gas phase
Additional charge on leakage	Possible	Possible
Kind	Incompatible oil	Compatible oil
Color	Non	Light yellow
Smell	Non	Non

w1 :Ozone Destruction Parameter	: based on CFC-11
w2 :Global Warmth Parameter	: based on CO2

Compressor

New Specification

Current Specification

The incompatible refrigerating oil easily separates from

Since refrigerant and refrigerating oil are compatible each,

refrigerant and is in the upper layer inside the suction muffler.

refrigerating oil backs to the compressor through the lower

Raising position of the oil back hole enables to back the

position oil back hole.

refrigerating oil of the upper layer to flow back to the

compressor.

Suction muffler

Suction muffler

Oil back hole

Compressor

Compressor

Refrigerating oil

Oil back hole

Refrigerating oil /Refrigerant

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/f [Gauge])

3

Conversion chart of refrigerant temperature and pressure

(MPa [Gauge])
	4.0
	3.5
pressure							R410A
	3.0						R22
liquid	2.5
	2.0														NOTE : The unit of pressure has been changed to MPa on the
	1.5
Saturated
	1.0														international system of units(SI unit system).
															The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f [Gauge])
	0.5
	0.0
	-0.5
	-30 -20			-10 0 10 20 30 40 50 60 (:)

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.

	R410A tools	Can R22 tools be used?	Description
			R410A has high pressures beyond the measurement range of existing
	Gauge manifold	No	gauges. Port diameters have been changed to prevent any other refrigerant
			from being charged into the unit.
	Charge hose	No	Hose material and cap size have been changed to improve the pressure
			resistance.
	Gas leak detector	No	Dedicated for HFC refrigerant.
	Torque wrench	Yes	6.35 mm and 9.52 mm
		No	12.7 mm and 15.88mm
	Flare tool	Yes	Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
	Flare gauge	New	Provided for flaring work (to be used with R22 flare tool).
	Vacuum pump	New	Provided to prevent the back flow of oil. This adapter enables you to use
	adapter		vacuum pumps.
	Electronic scale for	New	It is difficult to measure R410A with a charging cylinder because the
	refrigerant charging		refrigerant bubbles due to high pressure and high-speed vaporization

No : Not Substitutable for R410A Yes : Substitutable for R410A

2.Refrigerant piping

1Specifications

Use the refrigerant pipes that meet the following specifications.

	Pipe	Outside diameter	Wall	Insulation material
		mm	thickness
	6.35		0.8 mm
	For liquid			Heat resisting foam plastic
			0.8 mm
	9.52
	12.7		0.8 mm	Specific gravity 0.045 Thickness 8 mm

For gas

15.881.0 mm

•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.

4

2Flaring 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”.

Pipe diameter	Dimension of flare nut
mm	R410A		R22
6.35	17		17
9.52	22		22
12.7	26		24
15.88	29		27

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.

Indoor unit

Refrigerant gas cylinder operating valve

Union

	Stop valve
Liquid pipe
Gas pipe	Outdoor unit

Service port

Gauge manifold valve (for R410A)

Charge hose (for R410A)

Refrigerant gas cylinder for R410A with siphon

Refrigerant (liquid)

Electronic scale for refrigerant charging

5

2 PART NAMES AND FUNCTIONS

MUZ-A18YV - E1

MUZ-A24YV - E1

MUZ-A26YV - E1

OUTDOOR UNIT

Air inlet (back and side)

Piping

Drain hose

Air outlet

Drain outlet

ACCESSORIES

		MUZ-A18YV - E1
		MUZ-A24YV - E1
		MUZ-A26YV - E1
1	Drain socket	1
2	Drain cap [33	2

6

3

SPECIFICATION

Outdoor model

MUZ-A18YV -

E1

MUZ-A18YV - E1

Indoor model

Indoor model

MSZ-A18YV -

E1

MCFZ-A18WV - E1

Function

Cooling

Heating

Cooling

Heating

Power supply

Single phase

Single phase

230V,50Hz

230V,50Hz

Capacity

Capacity Rated frequency(Min.~Max.)

kW

5.0(0.9~5.9)

5.9(0.9~7.8)

4.8(10.9~5.5)

6.0(0.9~7.5)

Dehumidification

r/h

2.5

—

2.4

—

Air flow(High/LowW)

K /h

2,940/1,650W

2,940/2,210W

2,940/1,650W

2,940/2,210W

Power outlet

A

20

20

Electrical

Running current

A

6.62

7.38

7.76

8.87

data

Starting current

1

A

1,500

7.38

1,670

1,750

8.87

Power input

W

2,000

Power factor

%

98.5

98.4

98

Compressor motor current 1

A

6.32

7.08

7.46

8.57

Fan motor current

A

0.30

0.30

Coefficient of performance(C.O.P) 1

3.21

3.41

2.62

2.88

Compressor

resistance(at 20:)

V-W 0.45

V-W 0.45

Model

SNB130FLDH

SNB130FLDH

Output

W

850

850

Winding

"

U-V 0.45 W-U 0.45

U-V 0.45 W-U 0.45

motor

Model

PM8H60-UB

PM8H60-UB

Fan

Winding

"

BLK-WHT 15.2

BLK-WHT 15.2

resistance(at 20:)

WHT-RED 15.2 RED-BLK15.2

WHT-RED 15.2 RED-BLK15.2

Dimensions WOHOD

mm

840o850o330

840o850o330

Weight

kg

53

53

Sound level(High/LowW)

dB

53/51W

55/53W

53/51W

55/53W

Fan speed(High/LowW)

rpm

800/480W

800/620W

800/480W

800/620W

Fan speed regulator

2

2

Special

remarks

Refrigerant filling

kg

1.8

1.8

capacity(R410A)

Refrigerating oil(Model)

cc

450

(NEO22)

450

(NEO22)

Thermistor RT61(at 100:)

k"

13.4

13.4

Thermistor RT62(at 25:)

k"

10.0

10.0

Thermistor RT65(at 50:)

k"

17.0

17.0

Thermistor RT68(at 25:)

k"

10.0

10.0

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

7

Outdoor model

Function

Power supply

Capacity	Air flow(High/LowW)	K /h
	Capacity Rated frequency(Min.~Max.)	kW
	Dehumidification	r/h
	Power outlet	A
Electrical data	Running current	A
	Starting current 1	A
	Power input	W
	Power factor	%
	Compressor motor current 1	A
	Fan motor current	A

Coefficient of performance(C.O.P) 1

Compressor		resistance(at 20:)
		Model
		Output		W
		Winding		"
Fan	motor	Model		"
		Winding
		resistance(at 20:)
		Dimensions WOHOD		mm
		Weight		kg
		Sound level(High/LowW)		dB
		Fan speed(High/LowW)		rpm
		Fan speed regulator
Special	remarks	Refrigerant filling		kg
		capacity(R410A)
		Refrigerating oil(Model)		cc
		Thermistor RT61(at 100:)		k"
		Thermistor RT62(at 25:)		k"
		Thermistor RT65(at 50:)		k"
		Thermistor RT68(at 25:)		k"

MUZ-A24YV - E1			MUZ-A24YV - E1			MUZ-A26YV - E1
Indoor model			Indoor model			Indoor model
MSZ-A24YV - E1			MCFZ-A24WV - E1			MSZ-A26YV - E1
Cooling		Heating	Cooling		Heating	Cooling		Heating
Single phase			Single phase			Single phase
230V,50Hz			230V,50Hz			230V,50Hz
6.0(0.9~6.7)	6.8(0.9~8.1)		5.5(0.9~6.1)	6.4(0.9~7.9)		7.1(0.9~8.3)	8.1(0.9~9.6)
3.0		—	3.1		—	3.8		—

2,940/1,650W 2,940/2,210W 2,940/1,650W 2,940/2,210W 2,940/1,650W 2,940/2,210W

	20			20			20
8.49		8.75	10.38		10.47	10.75		11.42
1,921		1,981	2,340		2,360	2,431		2,581
	98.4			98			98.3
	8.75		10.47			11.42
8.19			10.08			10.45		11.12
		8.45			10.17
	0.30			0.30			0.30
3.02		3.32	2.27			2.84		3.06
					2.62
SNB130FLDH			SNB130FLDH			TNB220FMCH
	850			850		1,300
U-V 0.45 W-U 0.45			U-V 0.45 W-U 0.45			U-V 1.41		W-U 1.41
V-W 0.45			V-W 0.45			V-W 1.41
PM8H60-UB			PM8H60-UB			PM8H60-UB
BLK-WHT 15.2			BLK-WHT 15.2			BLK-WHT 15.2
WHT-RED 15.2 RED-BLK15.2 WHT-RED 15.2 RED-BLK15.2 WHT-RED 15.2 RED-BLK15.2
840o850o330			840o850o330			840o850o330
	53			53			58
53/51W		55/53W	53/51W		55/53W	53/51W		55/53W
800/480W		800/620W	800/480W		800/620W	800/480W		800/620W
	2			2			2
	1.8			1.8			2.0
450 (NEO22)			450 (NEO22)			870 (NEO22)
	13.4			13.4			13.4
	10.0			10.0			10.0
	17.0			17.0			17.0
	10.0			10.0			10.0

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

8

Specifications and rating conditions of main electric parts

OUTDOOR UNIT

Item		Model	MUZ-A18YV - E1		MUZ-A24YV - E1	MUZ-A26YV - E1
Smoothing capacitor		(CB1,2,3)			560+ 450V
Current transformer		(CT1,2)			ETQ19Z68AY
Current transformer		(CT61)			ETQ19Z53AY
Fuse	(F801, F912)				250V 3.15A
Fuse		(F911)			250V 1A
Fet array		(HC932)			SLA5075
High pressure switch		(HPS)		–		ACB-DB156
Power transistor module		(IPM)			PS21244-A
Reactor		(L)			340 H 20A
Expansion valve		(LEV)	CAM-30YGME 12VDC			CAM-40YGME 12VDC
Power factor controller		(PFC)			PS51259-A
Resistor		(R64)			10" 20W
Resistor		(R934A,B)			1.1" 2W 2%
Resistor		(RS1~4)			0.04" 7W
Solenoid coil relay		(SSR61)			TLP3506
Terminal block		(TB1)			3P
Terminal block		(TB2)			2P
Relay		(X64)			G4A
R.V. coil		(21S4)			LD30013

9

4 NOISE CRITERIA CURVES

MUZ-A18YV - E1

MUZ-A24YV - E1

MUZ-A26YV - E1

SPEED FUNCTION SPL(dB(A)) LINE

				High	COOLING		53
					HEATING		55
	Test conditions,
		Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)
	90	Heating : Dry-bulb temperature				7: Wet-bulb temperature 6:
BAR
MICRO	80
0.0002	70								NC-70	OUTDOOR UNIT
dB re	60									1m
LEVEL,									NC-60
										MICROPHONE
PRESSURE	50
									NC-50
	40
SOUND									NC-40
	30
BAND									NC-30
OCTAVE	20	APPROXIMATE
		NOISE
		THRESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
	10	63	125	250	500	1000	2000	4000	8000
				BAND CENTER FREQUENCIES, Hz

10

5 OUTLINES AND DIMENSIONS

MUZ-A18YV - E1

MUZ-A24YV - E1

MUZ-A26YV - E1

OUTDOOR UNIT

REQUIRED SPACE

		515
		299
	66	40
51	34

330

100mm or more

360

Unit: mm

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

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

500
840	80 Open as a rule
121	500mm or more if the back,	350mm or more
	both sides and top are open

		Service panel
		Liquid refrigerant
850		pipe joint
		Refrigerant pipe
		(flared) [6.35 (MUZ-A18/A24YV)
430		[9.52 (MUZ-A26YV)
		-
		30
		-
155		35
	90	Gas refrigerant
		pipe joint
	198	Refrigerant pipe
		(flared) [12.7 (MUZ-A18YV)
		[15.88 (MUZ-A24/A26YV)

11

12

POWER SUPPLY ~/N 230V 50Hz

CIRCUIT BRN BREAKER

TB1

L BLU

N

PE GRN/YLW

TAB1
			F912	X64			4
	NF			R64			TAB4
		F911		NR63			CN902CN903 12 2 1
TAB2				SSR61
	CT61
LDE1	LDE2	CN912			CN901
		1	3	1	2	3	5

NOISE FILTER		GRN	BLU	BLU
P.C. BOARD	GRN				BLK BLK BLK	BLK
			21S4

TO INDOOR UNIT CONNECTING 12V

TB2 RED

3

BLU

N

ELECTRONIC CONTROL P.C. BOARD

3 1

CN601

1

2

3

5

CN781

CN661

1 2 3 4

RT62 RT61

L

PFC

CT2 W

2

1

R

RED

RED

RED

S

CB1

CB2

CB3

3

4 YLW

W

YLW

BLK

V

V MC

2 1

CN5

IPM

BLK

U

BLK

1

CT1 U

WHT

2

RS1

RS3

BLK

3

CN2

CN4

RS2

RS4

CN3 21

456

7

1

2

LD2

LD1

LD9

POWER

RT65

BOARD

BLK

BLK

BLK

BLK

BLK

BLK

RED

WHT

GRN

1 5 6 7

CN702

7

8

CN795

6

LEV RT68

1	2	1	3	CN801
CN701
	F801

	T801	HC932
	R934A
	R934B

	5
CN931	2 3 4
	1
	3
	2
	1

CN932

GRY

PNK

ORN

BLU

YLW MF

RED

WHT

BLK

OUTDOOR	A24YV-MUZ	A18YV-MUZ
UNIT	E1 -	E1 -

DIAGRAM WIRING MODELS

SYMBOL	NAME	SYMBOL	NAME	SYMBOL	NAME	NOTES: 1.About the indoor side electric wiring
CB1~3	SMOOTHING CAPACITOR	MC	COMPRESSOR	RT65	FIN TEMPERATURE THERMISTOR	refer to the indoor unit electric wiring
CT1, 2	CURRENT TRANSFORMER	MF	OUTDOOR FAN MOTOR (INNER FUSE)	RT68	OUTDOOR HEAT EXCHANGER	diagram for servicing.
CT61	CURRENT TRANSFORMER	NF	NOISE FILTER		TEMPERATURE THERMISTOR	2.Use copper conductors only (for field wiring).
F801	FUSE (250V 3.15A)	NR63	VARISTOR	SSR61	SOLENOID COIL RELAY	3.Symbols below indicate.
F911	FUSE (250V 1A)	PFC	POWER FACTOR CONTROLLER	T801	TRANSFORMER	:Terminal block				:Connector
F912	FUSE (250V 3.15A)	R64	RESISTOR	TB1	TERMINAL BLOCK
HC932	FET ARRAY	R934A, B	RESISTOR	TB2	TERMINAL BLOCK
IPM	POWER TRANSISTOR MODULE	RS1~4	RESISTOR	X64	RELAY
L	REACTOR	RT61	DISCHARGE TEMPERATURE THERMISTOR	21S4	R.V. COIL
LEV	EXPANSION VALVE COIL	RT62	DEFROST THERMISTOR

DIAGRAM WIRING 6

TAB1

L

POWER SUPPLY

2

1

X64

4

~/N 230V 50Hz

BRN

NF

F912

RED

RED

BREAKER

R64

TAB4

CIRCUIT

TB1

YLW

3

4 YLW

NR63

CN903

BLK

N

PE

TAB2

CT61

12

L

BLU

BLK

GRN/YLW

LDE1

LDE2

F911

SSR61

CN902

21

BLK

CN912

CN901

1

3

1

2

3

5

NOISE FILTER

GRN

GRN

BLU BLU

P.C. BOARD

BLK

BLK

BLK

BLK

BLK

BLK

BLK

BLK

21S4

ELECTRONIC

1

2

3

5

1

5

6

7

13

CONTROL

TB2 RED

P.C. BOARD

CN781

CN702

TO INDOOR

3

31

CN601

UNIT

CN681

CN661

BLU

CONNECTING

1

2

1

2

3

4

7

8

CN795

12V

N

RED

6

HPS RED

RT62 RT61

RT68

LEV

R

S

7 6 5 4 3 2 1 2 1

PFC						CT2 W RED
		CB1	CB2	CB3			W
CN5				IPM		V	V MC
							U
						CT1 U	WHT
		RS1		RS3			BLK
CN2						CN3 21
		RS2		RS4
CN4					POWER		RT65
1	2	LD2		LD1 LD9
						BOARD

	BLK BLK		RED	WHT	CN801
	1	2	1	3
	CN701
		F801

	T801	HC932
	R934A
	R934B

			GRN
		5	GRY
			PNK
	CN931	32 4
			ORN
			BLU
		1	YLW MF
		3	RED
			WHT
		2
			BLK
		1
	CN932

OUTDOOR	A26YV-MUZ
UNIT	E1 -

DIAGRAM WIRING MODEL

SYMBOL		NAME	SYMBOL	NAME	SYMBOL	NAME	NOTES: 1.About the indoor side electric wiring
CB1~3	SMOOTHING CAPACITOR		MC	COMPRESSOR	RT68	OUTDOOR HEAT EXCHANGER	refer to the indoor unit electric wiring
CT1, 2	CURRENT TRANSFORMER		MF	OUTDOOR FAN MOTOR (INNER FUSE)		TEMPERATURE THERMISTOR	diagram for servicing.
CT61	CURRENT TRANSFORMER		NF	NOISE FILTER	SSR61	SOLENOID COIL RELAY	2.Use copper conductors only (for field wiring).
F801	FUSE (250V 3.15A)		NR63	VARISTOR	T801	TRANSFORMER	3.Symbols below indicate.
F911	FUSE (250V	1A)	PFC	POWER FACTOR CONTROLLER	TB1	TERMINAL BLOCK	:Terminal block				:Connector
F912	FUSE (250V	3.15A)	R64	RESISTOR	TB2	TERMINAL BLOCK
HC932	FET ARRAY		R934A, B	RESISTOR	X64	RELAY
HPS	HIGH PRESSURE SWITCH		RS1~4	RESISTOR	21S4	R.V. COIL
IPM	POWER TRANSISTOR MODULE		RT61	DISCHARGE TEMPERATURE THERMISTOR
L	REACTOR		RT62	DEFROST THERMISTOR
LEV	EXPANSION VALVE COIL		RT65	FIN TEMPERATURE THERMISTOR

7 REFRIGERANT SYSTEM DIAGRAM

MUZ-A18YV	- E1							Unit:mm
MUZ-A24YV	- E1
OUTDOOR UNIT
Refrigerant pipe [12.7 (MUZ-A18YV)				Muffler
(with heat insulator) [15.88 (MUZ-A24YV)			4-way valve		#100

Stop valve
(with service port)				Outdoor
Flared connection	Discharge
				heat
	temperature			exchanger
	thermistor		Defrost
	RT61		thermistor
			RT62
	Compressor
				Outdoor heat
				exchanger
				temperature
				thermistor
Flared connection				RT68
	Strainer	LEV
			Strainer
				R.V. coil
Receiver #100			#100
				heating ON
Stop valve	Capillary tube			cooling OFF
	[3.6 [2.4 50

Refrigerant pipe [6.35	Refrigerant flow in cooling
(with heat insulator)	Refrigerant flow in heating

MUZ-A26YV - E1		Capillary tube								Unit:mm
OUTDOOR UNIT		[1.8 [0.6 1000
Refrigerant pipe [15.88		4-way valve	Oil separator High-pressure
(with heat insulator)						switch

Stop valve
(with service port)		Strainer		Defrost	Outdoor
Flared connection
					heat
			#100	thermistor	exchanger
				RT62
			Discharge
			temperature
			thermistor
			RT61
		Compressor			Outdoor
					heat
					exchanger
					temperature
					thermistor
Flared connection					RT68
		LEV
	Strainer		Strainer
Receiver					R.V. coil
	#100		#100
					heating ON
Stop valve	Capillary tube				cooling OFF
Refrigerant pipe [9.52	[3.6 [2.4 50			Refrigerant flow in cooling
(with heat insulator)				Refrigerant flow in heating
	14

MAX. REFRIGERANT PIPING LENGTH

		Refrigerant piping	Piping size O.D : mm		Length of connecting pipe : m
Model		Max. length : m
		A	Gas	Liquid	Indoor unit	Outdoor unit
MUZ-A18YV -	E1		12.7	6.35	Gas 0.43	Gas 0
MUZ-A24YV -		30
	E1		15.88		Liquid 0.5	Liquid 0
MUZ-A26YV -	E1			9.52

MAX. HEIGHT DIFFERENCE

Indoor unit

wMax. Height difference 15m

Refrigerant Piping

Max. length

A

Outdoor unit

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

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

Model	Outdoor unit			Refrigerant piping length (one way)
	precharged	7m	10m		15m	20m		25m	30m
MUZ-A18YV - E1	1,800	0	60		160	260		360	460

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

Model

Outdoor unit

Refrigerant piping length (one way)

precharged

7m

10m

15m

20m

25m

30m

MUZ-A24YV - E1

1,800

0

60

160

260

360

460

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

Model

Outdoor unit

Refrigerant piping length (one way)

precharged

7m

10m

15m

20m

25m

30m

MUZ-A26YV - E1

2,000

0

165

440

715

990

1,265

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

15

8 PERFORMANCE CURVES

MUZ-A18YV - E1

MUZ-A24YV - E1

MUZ-A26YV - 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		Cooling
	(3)	Outdoor intake air dry-bulb temperature :	°C DB
	(4) Total input :		W
	(5)	Indoor intake air dry-bulb temperature :	°C DB	}
	(6)	Outdoor intake air wet-bulb temperature :	°C WB		Heating
	(7) Total input :		W

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.

INDOOR UNIT

OUTDOOR UNIT

Wet and dry-bulb	Wet and dry-bulb
thermometers	thermometers

Indoor air Wet-bulb temperature difference (degree)

	11.4							11.1								11.3							12.9							13.9
	10.5							10.2								10.3							11.7							12.7
	9.5							9.2								9.3							10.6							11.4
	8.6							8.3								8.4							9.6							10.3
	7.7							7.5								7.5							8.6							9.2
	6.8							6.6								6.7							7.6							8.1
																											Rated frequency 102Hz
					Rated frequency 73Hz				E1			Rated frequency 84Hz								Rated frequency 88Hz				E1										Rated frequency 63Hz
		E1		E1							E1						E1		E1							E1					E1		E1
									MCFZ-A18WV -															MCFZ-A24WV -
		MSZ-A18YV -		MUZ-A18YV -							MUZ-A18YV -						MSZ-A24YV -		MUZ-A24YV -							MUZ-A24YV -					MSZ-A26YV -		MUZ-A26YV -

Indoor	intake
	air
	Wet-
	bulb
	temperature (
	:)

Outdoor intake air Dry-bulb temperature (:)

			)
			(:
			ulb temperature
		-b
	et
air	W
intake
Indoor

Outdoor intake air Dry-bulb temperature (:)

16