Mitsubishi MSC-C07SV, MUH-C07SV, MSC-C09SV, MUH-C09SV, MSC-C12SV SERVICE MANUAL

Revision

•Set temperature change of Operating Temperature of Defrosting in MUH-C09SV- E1 .

•Change of refrigeration oil amount of MUH-C07/C09SV- E1 .

• Installed place change of defrost thermistor RT61 in

MUH-C07/C09/C12SV- E1 .

• Please void OB250.

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

	HFC	No. OB250
		REVISED EDITION-A
SERVICE MANUAL	utilized
	R-407C

Wireless type

Models

MSC-C07SV MSC-C09SV MSC-C12SV MSH-C18SV

-

-

-

-

E1 (WH)

E1 (WH)

E1 (WH)

E1 (WH)

·MUH-C07SV - E1

·MUH-C09SV - E1

·MUH-C12SV - E1

·MUH-C18SV - E1

CONTENTS

MSC-C07SV - E1 MSC-C09SV - E1 MSC-C12SV - E1

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

2.SPECIFICATION················································5

3.NOISE CRITERIA CURVES ······························7

4.WIRING DIAGRAM ···········································8

5.REFRIGERANT SYSTEM DIAGRAM ·············10

6.PERFORMANCE CURVES ·····························11

7.SERVICE FUNCTIONS ···································23

8.TROUBLESHOOTING ····································23

9.PARTS LIST ····················································24

NOTE: This service Manual covers only change points.

•MSC-07/09/12RV - E1 , MUH-07/09/12RV - E1 MSC-C07/C09/C12SV - E1 , MUH-C07/C09/C12SV - E1 Please refer to the Service Manual OB227 REVISED EDITION-B for unchanged contents.

•MSH-18NV - E4 , MUH-18NV - E4 MSH-C18SV - E1 , MUH-C18SV - E1

Please refer to the Service Manual OB229 REVISED EDITION-A for unchanged contents.

1 TECHNICAL CHANGES

The following are in common details.

1.Refrigerant type has changed from R-22(HCFC) to R-407C(HFC).

2.Rated voltage has changed from 220-240V to 220-230V.

3.Compressor has changed from one for R-22 to one for R-407C.

4.Jumper wire JPE for defrosting temperature change in deicer P.C.board is cut at factory shipping.

5.Refrigerant circuit has changed. (Accumulator has been removed.)

MSH-18NV - E4 MSH-C18SV - E1

1. It has become impossible that MSH-C18SV- E1 is connected to MXZ series as multi system units.

MUH-07RV - E1 MUH-C07SV - E1

1.Path of heat exchanger has changed.

2.Operating Temperature of Defrosting has changed.

Starting of defrost	: -3: or less 0: or less
Releasing of defrost	: 3.1: or more 10.1: or more

3. Refrigerant oil has changed from MS56 to NEO22.

MUH-09RV - E1 MUH-C09SV - E1

1.Path of heat exchanger has changed.

2.Operating Temperature of Defrosting has changed.

Starting of defrost	: -3: or less 4.3: or less
Releasing of defrost	: 3.1: or more 14.7: or more

3. Refrigerant oil has changed from MS56 to NEO22.

MUH-12RV - E1 MUH-C12SV - E1

1.Capillary tube has changed. {3.0X{1.8X300 {3.0X{1.8X250, {3.0X{1.6X700 {3.0X{1.6X800)

2.Operating temperature of High Pressure Protection has changed.

	Outdoor fan motor ON : 48: 56:
	Outdoor fan motor OFF: 52: 60:
3.	Operating temperature of Defrosting has changed.
	Starting of defrost	: -3: or less 0: or less
	Releasing of defrost	: 3.1: or more 10.1: or more
4.	Refrigerant oil has changed from MS56 to NEO22.

MUH-18NV - E4 MUH-C18SV - E1

1.	Operating temperature of High Pressure Protection has changed.
	Outdoor fan motor ON : 56: 52:
	Outdoor fan motor OFF: 60: 56:
2.	Operating temperature of Defrosting has changed.
	Starting of defrost	: -3: or less 0: or less
	Releasing of defrost	: 3.1: or more 10.1: or more
3.	Refrigerant oil has changed from MS32N1 to NEO22.

2

INFORMATION FOR THE AIR CONDITIONER WITH R-407C REFRIGERANT

This room air conditioner adopts HFC refrigerant (R-407C) which is never destroy the ozone layer. Pay attention following points.

1Take sufficient care not to allow water and other contaminations to enter the R-407C refrigerant during storage and installation, since it is more susceptible to contaminations than HCFC refrigerant.

2Clean refrigerant pipings should be used.

3Composition change may occur in R-407C since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent composition change.

4Be especially careful when managing the tools.

If dust, dirt, or water mixes in the refrigerant cycle, it may cause decrease of performance.

			New refrigerant	Previous refrigerant
	Refrigerant		R-407C	R-22
	Composition (Ratio)		R-32: R-125: R-134a (23%:25%:52%)	R-22 (100%)
	Refrigerant handling		Non-azeotropic refrigerant	Single refrigerant
	Chlorine		Not included	Included
Refrigerant	Safety group (ASHRAE)		A1/A1	A1
	Saturated steam density [25:](Kg/K)		42.5	44.4
	Molecular weight		86.2	86.5
	Boiling point (:)		-43.6	-40.8
	Steam pressure [25:](Mpa [Gauge])		0.9177	0.94
	Combustibility		Non combustible	Non combustible
	ODP w1		0	0.055
	GWP w2		1530	1700
	Refrigerant charge method		From liquid phase in cylinder	Gas phase
	Additional charge on leakage		Impossible	Possible
Lubricant	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

Previous Specification

The incompatible lubricant easily separates from refrigerant

Since refrigerant and lubricant are compatible each other,

and makes the layer in the upper inside the suction muffler.

lubricant returns to the compressor through the lower

The higher position of the returning oil hole enables to return

position returning oil hole.

the lubricant of the upper layer to the compressor.

Suction muffler

Suction muffler

Returning oil hole

Compressor

Compressor

Lubricant

Returning oil hole

Refrigerant

Lubricant and Refrigerant

Conversion chart of refrigerant temperature and pressure

(MPa [Gauge])

	4.0
pressure	3.5
								R-407C
	2.5
liquid	3.0							R-22
	2.0															NOTE : The unit of pressure has been changed to MPa on the
Saturated	1.5
																international system of units(SI unit system).
	1.0															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 (:)

3

1.Tools dedicated for the air conditioner with R-407C refrigerant

The following tools are required for R-407C refrigerant. Some R-22 tools can be substituted for R-407C tools. Do not use tools that are used with R-22 refrigerant in order to avoid mixing oils.

	R-407C tools	Can R-22 tools be used?		Description
	Gauge manifold	No	A gauge manifold with a sight glass is recommended for charging the
			liquid refregerant.
	Charge hose	No	Hose material have been changed to improve the pressure
			resistance.
	Gas leak detector	No	Dedicated for HFC refrigerant.
	Torque wrench	Yes
	Flare tool	Yes
	Vacuum pump	New	Provided to prevent the back flow of oil. This adapter enables you to use
	adapter		existing vacuum pumps.
	Electronic scale for	New	It is difficult to measure R-407C with a charging cylinder because of
	refrigerant charging		refrigerant bubbles due to high pressure and high-speed vaporization.

2.Refrigerant piping

Do not use copper pipes which are broken, deformed or discoloured.

In addition, be sure that the inner surfaces of the pipes are clean, free of hazardous sulfur and oxides, or have no dust/ dirt, shaving particles, oil, moisture or any other contamination.

•If there is a large amount of residual oil inside the piping and joints, deterioration of the refrigerant oil will result.

3.Refrigerant oil

Apply the specific refrigeration oil (accessories) to the flare and the union seat surfaces.

4.Air purge

Use the vacuum pump for air purge to protect environments, and to avoid changing the composition of refrigerant.

5.Additional charge

For additional charging, charge the refrigerant with liquid phase slowly using a gas cylinder. If the refrigerant is charged with gas phase, the composition of refrigerant will change.

If liquid refrigerant is rapidly charged at once, the compressor may be locked.

	Union
		Stop valve
Indoor unit	Liquid pipe
Refrigerant	Gas pipe	Outdoor unit
gas cylinder
operating	Service port
valve
	Gage manifold
	Charge hose
	Refrigerant gas cylinder
	for R-407C with siphon
	Refrigerant (liquid)
	Electronic scale for
	refrigerant charging

4

2 SPECIFICATION

	Indoor model			MSC-C07SV - E1			MSC-C09SV - E1
	Function			Cooling		Heating	Cooling		Heating
	Indoor unit power supply			Single phase			Single phase
				220-230V,50Hz			220-230V,50Hz
Capacity	Air flow(Hi)		K /h	474		504	474		504
	Power outlet		A	10				10
Electrical data	Running current		A	0.17			0.17
	Power factor		%	93.6-89.5			93.6-89.5
	Power input		W	35				35
	Starting current		A	—				—
	Fan motor current		A	0.17			0.17
Fan motor	Model			RC4V19-BA			RC4V19-BA
	Winding		"	WHT-BLK 292			WHT-BLK 292
	resistance(at20:)			BLK-RED 325			BLK-RED 325
	Dimensions WOHOD		mm	850O278O191			850O278O191
	Weight		kg	9				9
	Air direction			5				5
	Sound level (Hi)		dB	36		35	36		35
Special remarks	Fan speed (Hi)		rpm	950		1000	950		1000
	Fan speed regulator			3				3
	Thermistor RT11(at25:)		k"	10				10
	Thermistor RT12(at25:)		k"	10				10
	Outdoor model			MUH-C07SV - E1			MUH-C09SV - E1
	Outdoor unit power supply			Single phase			Single phase
				220-230V,50Hz			220-230V,50Hz
Capacity
	Outdoor air flow		K /h	1,620-	1,668		1,620-		1,668
	Capacity		kW	2.2		2.4	2.5		3.0
	Dehumidification		R/h	0.8		—	1.1		—
	Power outlet		A	10				10
	Running current		A	3.27-3.17	2.95-2.89				4.05-3.96
	Power input		W	715-725		645-655	935-955		885-905
Electrical data	Auxiliary heater		A(kW)	—				—
	Power factor		%	99.4-99.4		99.4-98.5	98.2-99.3		99.3-99.4
	Starting current		A	18				22
	Compressor motor current		A	2.99-2.88	2.67-2.60		4.05-3.89		3.77-3.67
	Fan motor current		A	0.28-0.29			0.28-0.29
Coefficient of performance(C.O.P)				2.93-2.89	3.53-3.48				3.26-3.19
Compressor	Model			RE-135VGSHT			RE-174VGSHT
	Output		W	650			800
	Winding		"	C-R 4.21			C-R 3.31
	resistance(at20:)			C-S 5.93			C-S 6.01
Fan motor	Model			RA6V23-EA			RA6V23-EA
	Winding		"	WHT-BLK 258			WHT-BLK 258
	resistance(at20:)			BLK-RED 385			BLK-RED 385
	Dimensions WOHOD		mm	780o540o255			780o540o255
	Weight		kg	33				33
	Sound level		dB	47				47
	Fan speed		rpm	620-645			620-645
Special remarks	Fan speed regulator			1				1
	Refrigerant filling		kg	0.85			0.80
	capacity(R-407C)
	Refrigerating oil (Model)		cc	350		(NEO22)	350	(NEO22)
	Thermistor RT61(at0:)		k"	33.18			33.18

NOTE: Test conditions are based on ISO 5151 (Refrigerant piping length (one way): 5m)

Cooling : Indoor	DB27°C / WB19°C	Heating : Indoor	DB20°C
: Outdoor	DB35°C / WB24°C	: Outdoor	DB 7°C / WB 6°C
		5

MSC-C12SV - E1

Cooling Heating

Single phase 220-230V,50Hz

588 642

10

0.19

40

95.7-91.5

—

0.19

RC4V19-BA

WHT-BLK 292

BLK-RED 325

850O278O191

10

5

39	39
1020	1100

3

10

10

MUH-C12SV - E1

Single phase 220-230V,50Hz

3.44.0

1.6 —

1,656-1,704

10

5.78-5.73 5.87-5.87

1220-1240 1240-1270

—

95.9-94.1 96.0-94.1

34

5.42-5.36 5.51-5.50

0.36-0.37

2.70-2.66 3.13-3.05

RE-231VHSHT

1100

C-R 2.26

C-S 4.07

RA6V33-CA

WHT-BLK 176

BLK-RED 413

780o540o255

38

49

700-720

1

1.20

620 (NEO22)

33.18

	Indoor model				MSH-C18SV - E1
	Function			Cooling		Heating
	Indoor unit power supply				Single phase
					220-230V,50Hz
Capacity	Air flow(Hi)		K /h		756
	Power outlet		A		15
Electrical data	Running current		A		0.25
	Power input		W		55
	Power factor		%		100.0-95.7
	Starting current		A		—
	Fan motor current		A		0.25
Fan motor	Model				RA4V27-EF
	Winding		"		WHT-BLK 184
	resistance(at20:)				BLK-RED 250
	Dimensions WOHOD		mm		1,015O320O190
	Weight		kg		14
	Air direction				5
	Sound level (Hi)		dB		42
Special remarks	Fan speed (Hi)		rpm		1,180
	Fan speed regulator				4
	Thermistor RT11(at25:)		k"		10
	Thermistor RT12(at25:)		k"		10
	Outdoor model				MUH-C18SV - E1
	Outdoor unit power supply				—
Capacity	Capacity		kW	5.1		5.4
	Dehumidification		R/h	2.5		—
	Outdoor air flow		K /h		2,142-2,196
	Power outlet		A		15
	Running current		A	9.44-9.34		9.17-9.12
	Power input		W	2,035-2,085		1,975-2,035
Electrical data	Auxiliary heater		A(kW)		—
	Power factor		%	98.0-97.1		97.9-97.0
	Starting current		A		55
	Compressor motor current		A	9.05-8.95		8.78-8.73
	Fan motor current		A		0.39
Coefficient of performance(C.O.P)				2.44-2.38		2.66-2.58
Compressor	Model				PE-36VPEHT
	Output		W		1,600
	Winding		"		C-R 1.06
	resistance(at20:)				C-S 2.03
Fan motor	Model				RA6V50-OG
	Winding		"		WHT-BLK 116
	resistance(at20:)				BLK-RED 111
	Dimensions WOHOD		mm		850o605o290
	Weight		kg		54
	Sound level		dB		52
	Fan speed		rpm		810-828
Special remarks	Fan speed regulator				1
	Refrigerant filling		kg		1.70
	capacity(R-407C)
	Refrigerating oil (Model)		cc		1100 (NEO22)
	Thermistor RT61(at0:)		k"		33.18

NOTE: Test conditions are based on ISO 5151 (Refrigerant piping length (one way): 5m)

Cooling : Indoor	DB27°C / WB19°C	Heating : Indoor	DB20°C
: Outdoor	DB35°C / WB24°C	: Outdoor	DB 7°C / WB 6°C

6

3 NOISE CRITERIA CURVES

MUH-C07SV - E1

MUH-C09SV - E1

NOTCH FUNCTION SPL(dB(A)) LINE

				Hi	COOLING		47
					HEATING
				Test conditions, Cooling : DB 35: WB 24:
	90					Heating : DB 7: WB 6:
BAR
MICRO	80
0.002	70								NC-70
dB re
	60
LEVEL,
									NC-60
PRESSURE	50
									NC-50
	40
SOUND									NC-40
	30
BAND									NC-30
		APPROXIMATE
OCTAVE	20
		THRESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
	10	NOISE
		63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz

MUH-C12SV - E1

NOTCH FUNCTION SPL(dB(A)) LINE

				Hi	COOLING		49
					HEATING
				Test conditions, Cooling : DB 35: WB 24:
	90					Heating : DB 7: WB 6:
BAR
MICRO	80
0.002	70								NC-70
dB re
	60
LEVEL,
									NC-60
PRESSURE	50
									NC-50
	40
SOUND									NC-40
	30
BAND									NC-30
		APPROXIMATE
OCTAVE	20
		THRESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
	10	NOISE
		63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz

MSH-C18SV - E1

MUH-C18SV - E1

NOTCH FUNCTION SPL(dB(A)) LINE

				Hi	COOLING		42
					HEATING
				Test conditions, Cooling : DB 27: WB 19:
	90					Heating : DB 20: WB - :					90
BAR										BAR
MICRO	80									MICRO	80
0.002	70								NC-70	0.002	70
dB re										dB re
	60										60
LEVEL,										LEVEL,
									NC-60
PRESSURE	50									PRESSURE	50
									NC-50
	40										40
SOUND									NC-40	SOUND
	30										30
BAND									NC-30	BAND
		APPROXIMATE
OCTAVE	20									OCTAVE	20
		THRESHOLD OF
		HEARING FOR							NC-20
		CONTINUOUS
	10	NOISE									10
		63	125	250	500	1000	2000	4000	8000

NOTCH FUNCTION SPL(dB(A)) LINE

		Hi	COOLING		45
			HEATING
		Test conditions, Cooling : DB 35: WB 24:
				Heating : DB 7: WB 6:
							NC-70
							NC-60
							NC-50
							NC-40
							NC-30
APPROXIMATE
THRESHOLD OF
HEARING FOR							NC-20
CONTINUOUS
NOISE
63	125	250	500	1000	2000	4000	8000

BAND CENTER FREQUENCIES, Hz

BAND CENTER FREQUENCIES, Hz

7

4 WIRING DIAGRAM

MSC-C07SV - E1 MSC-C09SV - E1 MSC-C12SV - E1

MODELS WIRING DIAGRAM

INDOOR UNIT

	TO OUTDOOR		TB
	UNIT			BRN
	CONNECTING		L
			BRN
			3	RED
	12V		N	BLU
			BLU
			2	WHT
			1	BLK
	POWER
	SUPPLY
	CORD
	~/N 220-230V
	50Hz
	PE			GRN/YLW
	CIRCUIT BREAKER
	SYMBOL		NAME
	C11	INDOOR FAN CAPACITOR
	F11	FUSE(3.15A)
	HIC1	DC/DC CONVERTER
	MF	INDOOR FAN MOTOR(INNER FUSE)

	TAB12			CN		RT12
				112
	CN201	HIC1		CN		RT11
				111
	3
	2		NR11		3	BLK	1
				CN		GRY
	1						2
				121		YLW
	CN202						3
								MF
		TRANS		1		BRN
	2		C11			WHT	4
	1	F11	SR141	2			5
				3		RED	6
CN	LD101T		CN211
151	ELECTRONIC CONTROL P.C. BOARD
5	5
	POWER MONITOR,
MV	RECEIVER
	P.C.BOARD
			REMOTE
			CONTROLLER
SYMBOL	NAME		SYMBOL			NAME

MV	VANE MOTOR	SR141	SOLID STATE RELAY
NR11	VARISTOR	TB	TERMINAL BLOCK
RT11	ROOM TEMPERATURE THERMISTOR
RT12	INDOOR COIL THERMISTOR

NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

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

3.Symbols below indicate.

/: Terminal block, : Connector

MUH-C07SV - E1 MUH-C09SV - E1 MUH-C12SV - E1 MODELS WIRING DIAGRAM

OUTDOOR UNIT

RT61

21S4

FROM

BLK BLK

TB2

MF

INDOOR UNIT

RED

CN661

CN721

CONNECTING

3

1

CN730

X62

12V

N

BLK

2

C65

RED

3

SR61

1

BRN

WHT

CIRCUIT BREAKER

2

TB1

BRN

F61

IC881

NR61

3

L

POWER SUPPLY

DSAR

4

BLK

TRANS

CN711

N

BLU

~/N

TAB20

52C

220-230V

X62

50Hz

PE

4 3

DEICER P.C. BOARD

WHT

C

C1

MC R

GRN/YLW

BLU

RED

S

BLK

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

NAME

C1	COMPRESSOR CAPACITOR	MC	COMPRESSOR(INNER PROTECTOR)	TB1,TB2	TERMINAL BLOCK
C65	OUTDOOR FAN CAPACITOR	MF	OUTDOOR FAN MOTOR(INNER PROTECTOR)	X62	REVERSING VALVE COIL RELAY
DSAR	SURGE ABSORBER	NR61	VARISTOR	21S4	REVERSING VALVE COIL
F61	FUSE(2A)	RT61	DEFROST THERMISTOR	52C	CONTACTOR
IC881	DC/DC CONVERTER	SR61	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

8

MSH-C18SV - E1 MODEL WIRING DIAGRAM

INDOOR UNIT

TO OUTDOOR

L TB

UNIT

BRN

CN

RT12

CONNECTING

BRN

HIC1

IC141

112

12V

3

RED

F12

220-230V~

2

BLU

2

4

NR11

CN

3

BRN

WHT

BLU

CN201

52C

121

YLW

1

3

3

CN211

GRY

N

BLU

BLU

TRANS

C11

WHT MF

4

1

BLU

BRN

F11

2

RED

BLK

POWER

GRN/YLW

LD1

1

SUPPLY

CN

CN

CN

CN

RT11

CORD

101

102

151 ELECTRONIC CONTROL P.C BOARD

111

~/N 220-230V

DSAR

5

50Hz

PE

3

3

MV

GRN/YLW

CIRCUIT BREAKER

RECEIVER

DISPLAY

P.C.BOARD

P.C.BOARD

REMOTE

CONTROLLER

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

NAME

C11	INDOOR FAN CAPACITOR	IC141	HYBRID IC	RT12	INDOOR COIL THERMISTOR
DSAR	SURGE ABSORBER	MF	INDOOR FAN MOTOR(INNER FUSE)	TB	TERMINAL BLOCK
F11	FUSE(3.15A)	MV	VANE MOTOR	52C	CONTACTOR
F12	THERMAL FUSE(93:)	NR11	VARISTOR
HIC1	DC/DC CONVERTER	RT11	ROOM TEMPERATURE THERMISTOR

NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

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

3.Symbols below indicate.

/: Terminal block, : Connector

MUH-C18SV - E1

MODEL WIRING DIAGRAM

OUTDOOR UNIT

RT61

21S4

52C

BLK

BLK

VLT

VLT

TB

MF

CN730 CN661

12V

3

RED

CN721

CN720

1

X62

WHT

F61

C65

1

RED

1 RED

FROM INDOORUNIT CONNECTING

220-230V~ 2

SR61

TAB21

2

WHT

2 ORN

N

WHT

IC881

3

3 WHT

BLU

TRANS

4

BLK

4 BLK

NR61

X62 CN711

TAB20

DSAR

DEICER P.C.BOARD

GRN/YLW

WHT NO 52C

COM

WHT

C

C1

BLU

RED

MC

S

R

BLK

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

NAME

C1

COMPRESSOR CAPACITOR

MC

COMPRESSOR(INNER PROTECTOR)

TB

TERMINAL BLOCK

C65	OUTDOOR FAN CAPACITOR						MF	OUTDOOR FAN MOTOR(INNER PROTECTOR)	X62	REVERSING VALVE COIL RELAY
DSAR	SURGE ABSORBER						NR61	VARISTOR	21S4	REVERSING VALVE COIL
F61	FUSE(2A)						RT61	DEFROST THERMISTOR	52C	CONTACTOR
IC881	DC/DC CONVERTER						SR61	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

9

	5	REFRIGERANT SYSTEM DIAGRAM
							Unit:mm
	MSC-C07SV - E1						MUH-C07SV - E1
	MSC-C09SV - E1						MUH-C09SV - E1
	INDOOR UNIT			Refrigerant pipe [ 9.52			OUTDOOR UNIT
				(Option)		Reversing valve
				(with heat insulator)	Muffler
	Indoor		Indoor coil		Stop valve	Defrost	Outdoor
			thermistor			thermistor
	heat				(with service
	exchanger		RT12			RT61	heat
				Flared connection	port)
						Strainer	exchanger
	Room temperature
	thermistor						Capillary tube
	RT11
							[3.0x[1.4x800
							(2 pcs)

Compressor

Capillary tube

[3.0x[1.6x600(MUH-C07SV)

Flared connection

[3.0x[1.6x400(MUH-C09SV)

Check valve

Strainer

Reversing valve coil

heating ON

Stop valve

Capillary tube

cooling OFF

[3.0x[1.4x600(MUH-C07SV)

Refrigerant pipe [6.35

[3.0x[1.4x550(MUH-C09SV)

(Option)

Refrigerant flow in cooling

(with heat insulator)

Refrigerant flow in heating

Unit:mm

MSC-C12SV - E1

MUH-C12SV - E1

INDOOR UNIT

Refrigerant pipe [12.7

Reversing valve

OUTDOOR UNIT

(Option)

		(with heat insulator)	Muffler
Indoor	Indoor coil		Stop valve		Defrost
heat	thermistor				thermistor
			(with service port)			Outdoor
exchanger	RT12			Strainer	RT61
		Flared connection				heat
						exchanger

Room temperature

thermistor

RT11 Capillary tube [3.0x[1.4x500(2pcs)

		Compressor	Capillary tube
			[3.0x[1.8x250
Flared connection
		Capillary tube	Reversing valve coil
	Strainer	[3.0x[1.6x800
			heating ON
			cooling OFF
	Stop valve		Refrigerant flow in cooling
Refrigerant pipe [6.35
		Check

	(Option)	Refrigerant flow in heating
		valve
	(with heat insulator)
		10