Mitsubishi MU-A18WV-E1, MU-A24WV-E1, MU-A30WV-E1 Service Manual

SPLIT-TYPE, AIR CONDITIONERS

No. OB326

SERVICE MANUAL

Wireless type

Models

MU-A18WV - E1

MU-A24WV - E1

MU-A30WV - E1

CONTENTS

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. MICROPROCESSOR CONTROL ············

Indication of model name

10. TROUBLESHOOTING·················

MU-A18WV - E1

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

12. PARTS LIST······················

NOTE:

•This service manual describes technical data of outdoor units.

As for indoors unit MS-A18WV- E1 , MS-A24WV- E1 and MS-A30WV- E1 , refer to the service manual

OB325.

1 TECHNICAL CHANGES

MU-18RV - E1 MU-A18WV - E1

1.Refrigerant has changed. (R22 R410A)

2.Refrigerant system diagram has changed.

•Diameter of stop valve has changed. (Gas: [15.88 [12.7)

•Accumulator has removed.

3.Oil separator has been added.

4.Compressor has changed. (PH33VPET RN196VHSHT)

MU-24RV - E1 MU-A24WV - E1

1.Refrigerant has changed. (R22 R410A)

2.Refrigerant system diagram has changed.

•Diameter of stop valve has changed. (Liquid: [9.52 [6.35)

3.Compressor has changed. (NH47VMDT NN29VBAHT)

MU-30RV - E1 MU-A30WV - E1

1.Outdoor model has changed.

2.Refrigerant has changed. (R22 R410A)

3.Refrigerant system diagram has changed.

•Accumulator has removed.

4.Compressor has changed. (NH56VNHT NN37VAAHT)

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 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.

2Take 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

2

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.

Compressor

refrigerating oil of the upper layer to flow back to the

Compressor

Compressor

Oil back hole

compressor.

Suction muffler

Suction muffler

Refrigerating oil

Oil back hole

Refrigerant

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])

Conversion chart of refrigerant temperature and pressure

(MPa [Gauge])
	4.0
	3.5
pressure							R410A
	3.0						R22
liquid	2.5
	2.0
	1.5
Saturated
	1.0
	0.5
	0.0
	-0.5
	-30 -20			-10 0 10 20 30 40 50 60

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])

(:)

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 15.88 mm
	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

3

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.

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

4

2 PART NAMES AND FUNCTIONS

OUTDOOR UNIT
MU-A18WV - E1		MU-A30WV - E1
MU-A24WV - E1
	Air inlet	Air inlet
		(back and side)
	(back and side)

Piping

Drainage hose

Air outlet

Air outlet

Drain outlet

5

3 SPECIFICATION

Outdoor model

Function

Power supply

	Capacity		Air flow(High)	K /h
			Capacity	kW
			Dehumidification	r/h
	Electrical	data	Power outlet	A
			Starting current	A
			Compressor motor current	A
			Fan motor current	A
	Coefficient of performance(C.O.P)
	Compressor		Model
			resistance(at20:)	W
			Output
			Winding	"
	Fan	motor	Model	"
			Winding
			resistance(at20:)
			Dimensions WOHOD	mm
			Weight	kg
			Sound level(High)	dB
	Special	remarks	Fan speed(High)	rpm
			Fan speed regulator
			Refrigerant filling	kg
			capacity(R410A)
			Refrigerating oil (Model)	cc
			Outdoor model
			Function
	Capacity		Power supply
			Air flow(High/Loww)	K /h
			Capacity	kW
			Dehumidification	R/h
	Electrical	data	Power outlet	A
			Starting current	A
			Compressor motor current	A
			Fan motor current	A
	Coefficient of performance(C.O.P)
	Compressor		resistance(at20:)
			Model
			Output	W
			Winding	"
	Fan	motor	Model	"
			Winding
			resistance(at20:)
			Dimensions WOHOD	mm
			Weight	kg
			Sound level(High)	dB
			Fan speed(High/Loww )	rpm
	Special	remarks	Fan speed regulator
			Refrigerant filling	kg
			capacity(R410A)
			Refrigerating oil (Model)	cc
			Thermistor RT62(at25:)	k"
			Thermistor RT63(at0:)	k"

NOTE: Test conditions are based on JIS C 9612. Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB(24°C) Indoor-Outdoor piping length 5m

w Reference value

MU-A18WV - E1	MU-A24WV - E1
Cooling	Cooling
Single phase	Single phase
230V, 50Hz	230V, 50Hz
5.0	6.5
2.5	3.4
2,196	2,322
15	25
37	74
7.51	10.27
0.39	0.55
2.76	2.62
RN196VHSHT	NN29VBAHT
1,300	1,900
C-R 1.80	C-R 0.80
C-S 3.00	C-S 1.64
RA6V50-OG	RA6V60-MA
WHT-BLK 116	WHT-BLK 71
BLK-RED 111	BLK-RED 89
850o605o290	850o605o290
44	60
52	53
828	873
1	1
1.40	1.90
520 (NEO22)	1,200 (NEO22)

MU-A30WV - E1

Cooling

Single phase 230V, 50Hz

8.5

4.6

2,940/1,470 w

25

90

13.85

0.57

2.61

NN37VAAHT

2,500

C-R 0.64

C-S 1.63

RA6V75-AB

WHT-BLK 62.8 BLK-YLW 55.9

YLW-RED 26.0

840o850o330

75

55

805/435 w

2

2.30

1,300 (NEO 22)

231.44

33.18

6

4 NOISE CRITERIA CURVES

MU-A18WV- E1		MU-A24WV- E1
	FAN SPEED SPL(dB(A)) LINE		FAN SPEED SPL(dB(A)) LINE

				High		52								High		53
Test conditions,										Test conditions,
	Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:
90											Cooling : Dry-bulb temperature 35:					Wet-bulb temperature 24:
										90
80										80
70								NC-70		70
																		NC-70
60										60
								NC-60
																		NC-60
50										50
								NC-50
																		NC-50
40										40
								NC-40
																		NC-40
30										30
								NC-30
																		NC-30
20	APPROXIMATE									20	APPROXIMATE
	THRESHOLD OF
PRESSUREOCTAVESOUNDLEVEL,MICRO0.0002BANDBARdBre									PRESSUREOCTAVESOUNDLEVEL,MICRO0.0002BANDBARdBre		THRESHOLD OF
	HEARING FOR							NC-20
											HEARING FOR							NC-20
	CONTINUOUS										CONTINUOUS
	NOISE										NOISE
10	63	125	250	500	1000	2000	4000	8000		10
											63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz	BAND CENTER FREQUENCIES, Hz

MU-A30WV- E1

FAN SPEED SPL(dB(A))

LINE

High 55

Test conditions,

Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:

BAR	90
MICRO	80
0.0002	70								NC-70
dB re	60
LEVEL,
									NC-60
PRESSURE	50
									NC-50
	40
									NC-40
SOUND
	30
BAND									NC-30
	20	APPROXIMATE
OCTAVE
		THRESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
	10	NOISE
		63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz

OUTDOOR UNIT

1m

MICROPHONE

7

5 OUTLINES AND DIMENSIONS

MU-A18WV- E1 MU-A24WV- E1

OUTDOOR UNIT

	Drainage	355	20
		350
	hole [16.2
		Air in
	35
248	90
	Air in
	Drainage	Air out	50
	3holes [33

605

292
20	183
	500
	850

MU-A30WV- E1

OUTDOOR UNIT

	515
	299
66	40

51

34

330

500
840	80

121

850

430

Unit: mm

100mm	or
	more

290

310

345

100mm or more

ormore 500mm

ormore 100mm

350mm	or
	more

	30	Service panel
			Liquid refrigerant
			pipe joint
			Refregerant pipe
			(flared) [6.35
		-	-
		30	35
157	100	Gas refregerant

pipe joint

161Refregerant pipe

(flared) [12.7 (MU-A18WV) [15.88 (MU-A24WV)

74

100mm or more

360

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

Open as a rule

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

155

90

8

350mm or more

Service panel

Liquid refrigerant pipe joint Refrigerant pipe (flared) [9.52

- 30

- 35

Gas refrigerant pipe joint

198 Refrigerant pipe (flared) [15.88

6

WIRING DIAGRAM

MU-A18WV - E1

MODEL WIRING DIAGRAM

OUTDOOR UNIT

TB2

TO

2

WHT

INDOOR UNIT

1

52C

CONNECTING

BLK

12V

DSAR

CIRCUIT BREAKER TB1

BRN

52C

L

BRN

WHT

C

NO

COM WHT

POWER SUPPLY

N

C1

RED

BLU

MC

~/N

S

230V 50Hz

PE

GRN/YLW

BLK

R

C2

ORNRED 1

ORNRED

WHT

2

WHT MF

BLU

3

BLK

4

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

NAME

C1

COMPRESSOR CAPACITOR

MC

COMPRESOR (INNER PROTECTOR)

52C

COMPRESSOR CONTACTOR

C2

OUTDOOR FAN CAPACITOR

MF

OUTDOOR FAN MOTOR (INNER PROTECTOR)

DSAR

SURGE ABSORBER

TB1,TB2 TERMINAL BLOCK

NOTES: 1.About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

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

3.Symbols below indicate.

: Terminal block

: Connector

MU-A24WV - E1		MODEL WIRING DIAGRAM
OUTDOOR UNIT
		TB2
	TO	2	WHT
	INDOOR UNIT	1			X1
	CONNECTING		BLK
	12V					DSAR
				BRN
			X1					WHT
			WHT							C
		BRN
							C1	RED		MC
			52C
	CIRCUIT BREAKER					52C		BLK S
		L
			BRN	BRN NO							R
			BLU			COM
	POWER SUPPLY	N						RED		RED
	~/N		BLU		NO	COM	C2		1
	230V 50Hz							ORN		ORN
	PE							WHT	2	WHT	MF
			GRN/YLW					BLU	3	BLK
									4
		TB1
SYMBOL	NAME	SYMBOL				NAME	SYMBOL				NAME
C1	COMPRESSOR CAPACITOR	MC		COMPRESSOR (INNER PROTECTOR)			X1	RELAY

C2	OUTDOOR FAN CAPACITOR	MF	OUTDOOR FAN MOTOR (INNER PROTECTOR) 52C COMPRESSOR CONTACTOR
DSAR	SURGE ABSORBER	TB1,TB2	TERMINAL BLOCK

NOTES: 1.About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing. 2.Use copper conductors only. (For field wiring)

3.Symbols below indicate.

: Terminal block : Connector

9

	MU-A30WV - E1	MODEL WIRING DIAGRAM
	OUTDOOR UNIT

CIRCUIT BREAKER

POWERSUPPLY	~/N230V 50Hz	L TB1
		GRN/YLW
		N
		PE
CONNECTING		3 TB2
UNIT	12V	N
TO INDOOR

		RT62 RT63				MF
	DSAR	LEV			YLW	BLK	WHT	ORN	RED
BRN
					YLW	BLK	WHT	2	1
			6	6	5	4	3			RED	C2
									ORN
		CN662	CN724		1	2	3	CN711
			SR62
		X52	SR61
								X52		TAB52
								COM		NO
									CN730 7
		DEICER	T61	NR61							5
									F61		3
		P. C. BOARD									1
	BRN
	BLU
	BRN 1	2	WHT								C
		52C
							C1		RED S		MC R
	WHT	CZ WHT
	BLU								BLK
	BLU		A1 52C A2								BLU

RED

BLU

SYMBOL	NAME	SYMBOL	NAME	SYMBOL	NAME
CZ	CZ SURGE ABSRBER	MC	COMPRESSOR (INNER PROTECTOR)	SR62	SOLID STATE RELAY
C1	COMPRESSOR CAPACITOR	MF	OUTDOOR FAN MOTOR (INNER PROTECTOR)	TB1	TERMINAL BLOCK
C2	OUTDOOR FAN CAPACITOR	NR61	VARISTOR	TB2	TERMINAL BLOCK
DSAR	SURGE ABSORBER	RT62	DISCHARGE TEMPERATURE THERMISTOR	T61	TRANSFORMER
F61	FUSE(3.15A)	RT63	AMBIENT TEMPERATURE THERMISTOR	X52	CONTACTOR
LEV	EXPANSION VALVE COIL	SR61	SOLID STATE RELAY	52C	COMPRESSOR CONTACTOR

NOTE 1. Use copper conductors only (For field wiring).

2.Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (3,N).

3.Symbols below indicate.

/: Terminal block, : Connector

10

7 REFRIGERANT SYSTEM DIAGRAM

MU-A18WV - E1		Unit:mm
OUTDOOR UNIT	Oil separator
Refrigerant pipe [12.7	Capillary tube
(with heat insulator)
	[2.5o[0.6o1,000
	Stop valve
	(with service	Outdoor
Flared connection	port)	heat
		exchanger
		Strainer
		#100

Compressor

Flared connection

Stop valve

Capillary tube Refrigerant pipe[6.35 [3.0o[1.6o600 (with heat insulator)

Refrigerant flow in cooling

MU-A24WV - E1

OUTDOOR UNIT

	Refrigerant pipe [15.88
	(with heat insulator)	Muffler
	Muffler	#100
	Stop valve
	(with service port)	Outdoor
	Flared connection	heat
		exchanger

Compressor

Flared connection

	Stop valve	Capillary tube
Refrigerant pipe [6.35		[3.0X[2.0X900
(with heat insulator)					Refrigerant flow in cooling
		11

MU-A30WV - E1	Unit:mm
OUTDOOR UNIT

Refrigerant pipe [15.88
(with heat insulator)		Muffler
Stop valve
(with service port)		Discharge	Outdoor
Flared connection		temperature	heat
		thermistor	exchanger
		RT62
	Muffler
		Compressor	Ambient
		Capillary tube	temperature
			thermistor
		[4.0 [2.4 200
			RT63
		(Upper path)
			Capillary tube
Flared connection
		LEV	[4.0 [2.4 100
			(Lower path)
		Strainer
Stop valve	Capillary tube
Refrigerant pipe [9.52	[3.6 [2.4 50		Refrigerant flow in cooling
(with heat insulator)

MAX. REFRIGERANT PIPING LENGTH

Model

MU-A18WV -

MU-A24WV -

MU-A30WV -

E1

E1

E1

	Refrigerant piping	Piping size O.D : mm		Length of connecting pipe : m
	Max. length : m
	A	Gas	Liquid	Indoor unit	Outdoor unit
	25	12.7	6.35	Gas 0.43	Gas 0
		15.88		Liquid 0.5	Liquid 0
	30		9.52

MAX. HEIGHT DIFFERENCE

Indoor unit

wMax. Height	Refrigerant Piping
difference:
10m(MS-A18/A24WV)/	Max. Length
15m(MS-A30WV)	A

Outdoor unit

wHeight difference should be within 10m(MS-A18/A24WV)/

15m(MS-A30WV) regardless of which unit, indoor or outdoor position is high.

12