Mitsubishi MUH-A07YV - E1, MUH-A09YV - E1, MUH-A12YV - E1 Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Revision A:

●MUH-A12YV - E1 can be connected to MCFH-A12WV - E1 .

Please void OB331.

	HFC	No. OB331
		REVISED EDITION-A
SERVICE MANUAL	utilized
	R410A
Wireless type
Models
MUH-A07YV - E1
MUH-A09YV - E1
MUH-A12YV - E1

CONTENTS

Indication of model name

MUH-A07YV - E1 MUH-A09YV - E1 MUH-A12YV - 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.MICROPROCESSOR CONTROL ············

10.SERVICE FUNCTIONS·················

11.TROUBLESHOOTING ·················

12.DISASSEMBLY INSTRUCTIONS············

13.PARTS LIST······················

NOTE:

•This manual describes technical data of outdoor units.

•As for indoor units MSC-A07/A09/A12YV - E1 , refer to the service manual OB329. •As for indoor unit MCFH-A12WV - E1 , refer to the service manual OB336.

Revision A:

•MUH-A12YV - E1 can be connected to MCFH-A12WV - E1 .

SPECIFICATION, PERFORMANCE CURVES and TROUBLESHOOTING have been added.

1 TECHNICAL CHANGES

MUH-A07WV- E1 MUH-A07YV- E1

1.Outdoor heat exchanger has changed.

2.Outdoor fan motor has changed. (RA6V23-FB RC6V20-AB)

MUH-A09WV- E1 MUH-A09YV- E1

MUH-A12WV- E1 MUH-A12YV- E1

1.Outdoor heat exchanger has changed.

2.Outdoor fan motor has changed. (RA6V33-DB RA6V33-FB)

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. 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 R410A refrigerant 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.

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
	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
	For liquid	6.35	0.8 mm	Heat resisting foam plastic
	For gas	9.52	0.8 mm
				Specific gravity 0.045 Thickness 8 mm

12.70.8 mm

•Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less than 0.8mm, 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

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

ACCESSORIES

MUH-A07YV - E1

MUH-A09YV - E1

MUH-A12YV - E1

Air inlet (back and side)

Piping

Drain hose

Air outlet

Drain outlet

MUH-A07YV- E1

MUH-A09YV- E1

MUH-A12YV- E1

<Outdoor unit: MUH type>

1	Drain socket	1
2	Drain cap	2

3 SPECIFICATION

			Outdoor model		MUH-A07YV - E1
			Outdoor unit power supply		Single phase
					230V,50Hz
			Function		Cooling Heating
	Capacity		Capacity	kW	2.3	2.5
			Outdoor air flow	K /h	1,686
			Dehumidification	R/h	0.9	—
			Power outlet	A		10
			Running current	A	3.00	2.86
	Electrical	data	Power input	W	680	655
			Auxiliary heater	A(kW)		—
			Power factor	%	98	99
			Starting current	A		23
			Compressor motor current	A	2.78	2.64
			Fan motor current	A		0.22
		Coefficient of performance (C.O.P)			3.22	3.62
	Compressor		Model		RN092VHSHT
			resistance (at 20:)	W	C-S 6.14
			Output			600
			Winding	"	C-R 3.87
	Fan	motor	Model	"	RC6V20-AB
			Winding		WHT-BLK 410
			resistance (at 20:)		BLK-RED 433
			Dimensions WOHOD	mm	780o540o255
			Weight	kg		35
			Sound level	dB		47
		remarks	Fan speed	rpm		735
	Special		Fan speed regulator			1
			capacity (R410A)
			Refrigerant filling	kg		0.62
			Refrigerating oil (Model)	cc	350	(NEO22)
			Thermistor RT61 (at 0:)	k"	33.18

NOTE: Test conditions are based on ISO 5151. Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB24°C Indoor-Outdoor piping length : 5m

			MUH-A12YV - E1		MUH-A12YV - E1
MUH-A09YV - E1			Indoor model		Indoor model
			MSC-A12YV - E1		MCFH-A12WV - E1
Single phase			Single phase		Single phase
230V,50Hz			230V,50Hz		230V,50Hz
Cooling	Heating		Cooling	Heating	Cooling	Heating
2.55	3.05		3.5	3.9	3.5	3.7
1.1	—		1.7	—	1.5	—
1,710			1,710		1,710
	10			10		10
3.32	3.52		4.65	4.60	4.85	4.23
760	805		1,050	1,040	1,094	954
	—			—		—
99	99		98	98	98	98
	24			29		29
3.01	3.21		4.34	4.29	4.54	3.92
0.31			0.31		0.31
3.21	3.69		3.21	3.61	3.02	3.63
RN104VHSHT			RN135VHSHT		RN135VHSHT
700			900		900
C-R 3.40			C-R 2.79		C-R 2.79
C-S 4.56			C-S 3.36		C-S 3.36
RA6V33-FB			RA6V33-FB		RA6V33-FB
WHT-BLK 223			WHT-BLK 223		WHT-BLK 223
BLK-RED 228			BLK-RED 228		BLK-RED 228
780o540o255			780o540o255		780o540o255
	38			40		40
	49			49		49
825			825		825
	1			1		1
1.00			1.00		1.00
350 (NEO22)			620 (NEO22)		620 (NEO22)
33.18			33.18		33.18
Heating : Indoor			DB20°C

Outdoor DB 7°C/WB 6°C

5

4 NOISE CRITERIA CURVES

MUH-A07YV-				E1		FUNCTION		SPL(dB(A))	LINE
							COOL
								47
							HEAT
					Test conditions,
						Cooling :DB35:			WB24:
	90					Heating :DB 7:			WB 6:
MICRO BAR	80
	70
dB re 0.0002
									NC-70
	60
LEVEL,									NC-60
PRESSURE	50
									NC-50
BAND SOUND	40
									NC-40
	30
OCTAVE
									NC-30
	20	APPROXIMATE
		TERESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
		NOISE
	10	63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz

MUH-A09YV-				E1		FUNCTION		SPL(dB(A))	LINE
MUH-A12YV-				E1			COOL	49
							HEAT
					Test conditions,
						Cooling :DB35:			WB24:
	90					Heating :DB 7:			WB 6:
MICRO BAR	80
	70
dB re 0.0002
									NC-70
	60
LEVEL,									NC-60
PRESSURE	50
									NC-50
BAND SOUND	40
									NC-40
	30
OCTAVE
									NC-30
	20	APPROXIMATE
		TERESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
		NOISE
	10	63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz

OUTDOORUNIT

1m

MICROPHONE

6

5 OUTLINES AND DIMENSIONS

MUH-A07YV - E1	MUH-A09YV - E1	MUH-A12YV - E1
OUTDOOR UNIT	Air in
	320
32
109		255 285 320
Air in
Drainage	147 110
3holes [33	Air out	25

540
260			155
				90
10	40	122
		500
			74
		780

6 WIRING DIAGRAM

Unit: mm

REQUIRED SPACE		moreor
		100mm	or	more
100mm			100mm
	or
	more

	or	more
	400mm		350mm
Service panel				or	more
	Liquid refrigerant
	pipe joint
	Refrigerant pipe
-	(flared) [6.35
35
-
43

Gas refrigerant pipe joint

104Refrigerant pipe

(flared) [9.52 (MUH-A07/A09YV)

[12.7 (MUH-A12YV)

MUH-A07YV - E1

MODELS WIRING DIAGRAM

MUH-A09YV - E1

21S4

MUH-A12YV - E1

TB2

RT61

MF

OUTDOOR UNIT

TO

3

RED

1

CN730

CN661

CN721

1

12V

SR62

INDOOR UNIT

N

BLK

2

CN711

CONNECTING

3

WHT

CIRCUIT BREAKER

TB1

BRN

SR61

2

BLK

L

BRN

DSAR

F61

NR61

3

RED

POWER SUPPLY

N

BLU

T61

C65

~/N

TAB20

52C

230V 50Hz

PE

GRN/YLW

4

3

DEICER P.C.BOARD

R

S

MC

WHT

C

BLU

C1

RED

BLK

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

NAME

	C1	COMPRESSOR CAPACITOR	MF	OUTDOOR FAN MOTOR	T61	TRANS FORMER
	C65	OUTDOOR FAN CAPACITOR		(INNER FUSE/INNER PROTECTOR)	TB1,TB2	TERMINAL BLOCK
	DSAR	SURGE ABSORBER	NR61	VARISTOR	21S4	R.V. COIL
	F61	FUSE(2A)	RT61	DEFROST THERMISTOR	52C	COMPRESSOR CONTACTOR
	MC	COMPRESSOR(INNER PROTECTOR) SR61,SR62 SOLID STATE RELAY

NOTE: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

7

7 REFRIGERANT SYSTEM DIAGRAM

MUH-A07YV - E1				Unit:mm
MUH-A09YV - E1
OUTDOOR UNIT	Refrigerant pipe [ 9.52
	(with heat insulator)		4-way valve
		Stop valve	Defrost
			thermistor	Outdoor
		(with service
			RT61
	Flared connection	port)		heat
			Muffler	exchanger

Flared connection

Strainer #100

Stop valve

Refrigerant pipe [6.35 (with heat insulator)

		Capillary tube
	Compressor	[3.0x[1.4x800(2 pcs)
		(MUH-A07YV)
	Capillary tube
		[3.0x[1.4x500(2 pcs)
	[3.0x[1.4x500(MUH-A07YV)
		(MUH-A09YV)
	[3.0x[1.4x600(MUH-A09YV)
	Check valve	R.V. coil
		heating ON
		cooling OFF

Capillary tube [3.0x[1.4x600(MUH-A07YV) [3.0x[1.4x1000(MUH-A09YV)

Refrigerant flow in cooling Refrigerant flow in heating

MUH-A12YV - E1					Unit:mm
OUTDOOR UNIT	Refrigerant pipe	[12.7
	(with heat insulator)		4-way valve
			Stop valve	Defrost
			(with service port)		Outdoor
	Flared connection		Muffler	thermistor	heat
				RT61
					exchanger

			Capillary tube
			[3.0x[1.4x500(2pcs)
		Compressor	Capillary tube
			[3.0x[1.6x600
	Flared connection
	Strainer	Capillary tube	R.V. coil
			heating ON
	#100	[3.0x[1.6x1050
			cooling OFF
	Stop valve		Refrigerant flow in cooling
	Refrigerant pipe [6.35
		Check	Refrigerant flow in heating
	(with heat insulator)	valve
	8

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
MUH-A07YV -
	E1	20	9.52		Gas 0.43	Gas 0
MUH-A09YV -
	E1			6.35
					Liquid 0.5	Liquid 0
MUH-A12YV -		25	12.7
	E1

MAX. HEIGHT DIFFERENCE

Indoor unit

	Height difference should be within			Refrigerant Piping
	10m regardless of which unit,
		w	Max. Height	Max.length
	indoor or outdoor position is high.

	difference 10m	A
		Outdoor unit

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

Model

Outdoor unit precharged

Refrigerant piping length (one way)

7m

10m

15m

20m

25m

MUH-A07YV -

620

E1

MUH-A09YV -

0

60

160

260

E1

1000

MUH-A12YV -

E1

360

Calculation : Xg=20g/m 5 x(A-7)m

8 PERFORMANCE CURVES

MUH-A07YV - E1 MUH-A09YV - E1 MUH-A12YV - 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

198~264V

(2)AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1)	Indoor intake air wet-bulb temperature :	°CWB	}
(2)	Indoor outlet air wet-bulb temperature :	°CWB		Cooling
(3)	Outdoor intake air dry-bulb temperature :	°CDB
(4)	Total input:	W	} Heating
(5)	Indoor intake air dry-bulb temperature :	°CDB
(6)	Outdoor intake air wet-bulb temperature :	°CWB
(7)	Total input :	W

Indoor air wet/dry-bulb temperature difference on the left side of the chart on page 10 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.

9

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

8-1.CAPACITY AND THE INPUT CURVES

8.5		9.6 11.0		8.7
7.8		8.8 10.0		8.0
7.1		8.0	9.1	7.3
6.4		7.2	8.2	6.6
5.8		6.5	7.4	5.9
5.1		5.7	6.5	5.3
MSC-A07YV - E1 MUH-A07YV - E1	MSC-A09YV - E1	MUH-A09YV - E1	MSC-A12YV - E1 MUH-A12YV - E1	MCFH-A12WV - E1 MUH-A12YV - E1

19.2													20.4								25.2										18.6
17.8														18.8							23.3											17.2
16.3															17.2						21.4												15.7
14.8																15.7					19.4													14.3
13.3																	14.1				17.5														12.9
11.8												12.5									15.5									11.5
10.4												11.0									13.6									10.0
8.9													9.4								11.7										8.6
																													E1
	E1		E1								E1											E1		E1												E1
																													MCFH-A12WV -
	MSC-A07YV -		MUH-A07YV -								MSC-A09YV -								MUH-A09YV -			MSC-A12YV -		MUH-A12YV-												MUH-A12YV -

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

10

8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation

Both indoor and outdoor unit are under the same temperature/humidity condition.

Dry-bulb temperature	Relative humidity(%)
20	50
25	60
30	70

Air flow should be set at MAX.

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] )

(kgf/F[Gauge])(MPa[Gauge]) MUH-A07YV - E1

	13	1.3
pressurelow		1.0									230V
	12	1.2
	11	1.1
Outdoor	10	0.9
	9
	8	0.8
	7		0.7
						18 20				30 32
		15						25				35(:)
						50		60		70(%)
					Ambient temperature(˚C)
					Ambient humidity(%)
(kgf/F[Gauge])(MPa[Gauge]) MUH-A09YV - E1
	13	1.3
											230V
		1.2
pressure	12
	11	1.1
low	10	1.0
Outdoor
	9	0.9
	8	0.8
	7		0.7
						18 20				30 32
		15						25				35(:)
						50		60		70(%)

Ambient temperature(˚C)

Ambient humidity(%)

MUH-A12YV - E1

(kgf/F[Gauge])(MPa[Gauge]) ( Indoor unit : MSC-A12YV - E1 )

	13	1.3
pressurelow		1.0							230V
	10
	12	1.2
	11	1.1
Outdoor	9	0.9
	8	0.8
	7		0.7
		15 18 20				25		30 32 35(:)
		50				60		70(%)

Ambient temperature(˚C)

Ambient humidity(%)

Outdoor unit current (A)

Outdoor unit current (A)

Outdoor unit current (A)

MUH-A07YV - E1

4

230V

3

2

1		30 32 35(:)
15 18 20	25
50	60	70(%)

Ambient temperature(˚C)

Ambient humidity(%)

MUH-A09YV - E1

4

230V

3

2

1		30 32 35(:)
15 18 20	25
50	60	70(%)

Ambient temperature(˚C) Ambient humidity(%)

MUH-A12YV - E1

( Indoor unit : MSC-A12YV - E1 )

5

230V

4

3

2		30 32 35(:)
15 18 20	25
50	60	70(%)

Ambient temperature(˚C)

Ambient humidity(%)

11