Mitsubishi Electronics MS24WN User Manual

Revision:

●PARTS LIST have been partially modified. ●Please void OB311.

SPLIT-TYPE, AIR CONDITIONERS

No. OB311

REVISED EDITION-A

SERVICE MANUAL

Wireless type

Models

MS24WN (W) · MU24WN

CONTENTS

1. FEATURES ······················

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

3.SPECIFICATION····················

		4. DATA·························
	INDOOR UNIT	5. OUTLINES AND DIMENSIONS ·············
		6. WIRING DIAGRAM ···················
	Indication of model name	7. REFRIGERANT SYSTEM DIAGRAM ···········
	MS24WN
		8. MICROPROCESSOR CONTROL ·············
	Remote	9. SERVICE FUNCTIONS ·················
	controller	10. TROUBLESHOOTING··················
		11. DISASSEMBLY INSTRUCTIONS·············
		12. PARTS LIST······················
	OUTDOOR UNIT	13. OPTIONAL PARTS ···················

Indication of model name

MU24WN

The Slim Line.

From Mitsubishi Electric.

TM

C

L

US

ISTED

Revision:

•Parts No. has been changed due to the color change of outdoor unit parts. WHITE NEW WHITE (Brighter)

•Capillary tube has been added to parts list.

	Model	Page	Part name	Part number
	MU24WN	47	CAPILLARY TUBE (TAPER PIPE)	E02 784 936
			[0.14X[0.09X1-31/32

1 FEATURES

MS24WN

		MU24WN
	LCD wireless
	remote controller
Model	Cooling capacity	SEER
MS24WN	22,800 Btu/h	10.5

“I FEEL CONTROL” IN OUR LCD WIRELESS REMOTE CONTROLLER WITH ON/OFF PROGRAM TIMER

Mitsubishi Electric’s new wireless remote controller incorporates a number of advanced features that provide even greater control and ease-to-use. It has a liquid crystal display which indicates such information as mode, fan speed and temperature selected as well as the programmed ON/OFF timer. It is also equipped with “I Feel Control”, a unique Mitsubishi Electric feature that allows the user to adjust the temperature to exactly the level he or she wants simply by tapping the button that describes present conditions : “Too Cool” or “Too Warm”. The optimum temperature set this way is then memorized for immediate recall whenever the air conditioner is used again.

Select desired air flow direction. REMOTE-CONTROL OPERATION MODE

Using the remote controller, you can select from five airflow settings to match room layout and the location of people. Also, you

can set the vane to swing automatically.

SWING

SWING

AUTO-RESTART FUNCTION

The auto restart function restarts the equipment automatically when power is restored following an outage. Operation resumes in the mode in which the equipment was running just before the outage.

HIGH PERFORMANCE ROTARY COMPRESSOR

The advanced design of Mitsubishi Electric’s powerful and energy efficient rotary compressor results in lower operating costs and longer service life.

3

2	PART NAMES AND FUNCTIONS
INDOOR UNIT
MS24WN
		Grille
	Deodorizing filter (option)	Air inlet
	(Gray sponge type)
	Air cleaning filter (option)
	(White bellows type)
	Front panel	Remote control
		receiving section
	Air filter	Horizontal vane
		Remote controller
	Vertical vane
	Operation section	Display section
(When the grille is opened)
		Operation indicator lamp
		Operation Indicator
	Emergency operation switch	Receiving section

ACCESSORIES

		MS24WN
1	Installation plate	1
2	Installation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.)	7
3	Remote controller holder	1
4	Fixing screw for 3 3.5 x 16 mm(0.14 x 0.63 in.) (Black)	2
5	Battery (AAA) for remote controller	2
6	Wireless remote controller	1
7	Felt tape (Used for left or left-rear piping)	1

OUTDOOR UNIT

MU24WN

4

REMOTE CONTROLLER

MS24WN

Signal transmitting section

Operation display section

OPERATE/ STOP

(ON/ OFF)button

		PM
		AM
ON/OFF	TOO	TOO
	WARM	COOL

TEMPERATURE buttons

Open the front lid.

VANE button (Horizontal vane button)

OPERATION SELECT button

WIDE VANE button (Vertical vane button)

RESET button

AM

ON/OFF	TOO	TOO
	WARM	COOL

FAN	STOP
I FEEL COOL
VANE	START
FAN DRY
MODE WIDE VANE	HR.
LONG	MIN.
RESET CLOCK

FAN SPEED CONTROL button

OFF-TIMER button

ON-TIMER button

HR. button MIN. button (TIME SET button)

CLOCK SET button

LONG button

5

	3			SPECIFICATION
	Item					Model	MS24WN
	Cooling capacity				1	Btu/h	22,800
	Power consumption				1	W	2,170
	EER 1 [SEER] 2						10.5 (10.5)
	INDOOR UNIT MODEL						MS24WN
	External finish						White
	Power supply						115V 60Hz 1[
	Max. fuse size (time delay)/ Disconnect switch					A	15
	Min. ampacity					A	1.1
	Fan motor				FAN Dry	F.L.A	0.82
	Airflow Low—Med.—High					CFM	431-491-565
					COOL Dry(Wet)	CFM	402(346)-484(417)-565(487)
	Moisture removal					pt./h	7.6
	Sound level Low-Med.-High					dB(A)	39-43-47
	Cond. drain connection O.D.					in.	5/8
					W	in.	43-5/16
	Dimensions				D	in.	8-15/16
	Weight				H	in.	12-13/16
						lb.	40
	OUTDOOR UNIT MODEL						MU24WN
	External finish						Munsell 5Y7/1
	Power supply						208/230V 60Hz 1[ 3 wires
	Max. fuse size (time delay)					A	25
	Min. ampacity					A	22
	Fan motor				Model	F.L.A	0.87
							PH33NPBT
	Compressor				Winding resistance (at 68˚F) Ω		C-R 0.84 C-S 2.09
						R.L.A	16
						L.R.A	58
	Refrigerant control						Linear expansion valve
	Sound level				W	dB(A)	55
						in.	34-1/4
	Dimensions				D	in.	11-5/8
	Weight				H	in.	33-1/2
						lb.	152
	REMOTE CONTROLLER						Wireless type
	Control voltage (by built-in transformer)						12V DC
	REFRIGERANT PIPING						Not supplied (optional parts)
	Pipe size				Liquid	in.	3/8 (0.0285)
	(Min. wall thickness)				Gas	in.	5/8 (0.0315)
	Connection method				Indoor		Flared
					Outdoor		Flared
	Between the indoor				Height difference	ft.	Max. 25
	& outdoor units				Piping length	ft.	Max. 50
	Refrigerant charge (R22)						4 Ib. 5 oz.
	Refrigerant oil (Model)					oz.	27.9 (MS32N1)

Notes : Test conditions are based on ARI 210/240

1 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB)2 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 82˚FDB, 65˚FWB

Operating Range

			Indoor intake air temperature	Outdoor intake air temperature
	Cooling	Maximum	95˚FDB, 71˚FWB	115˚FDB
		Minimum	67˚FDB, 57˚FWB	67˚FDB

6

MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE

			Additional piping		Piping size : in.			Length of connecting pipe : in.
				Gas		Liquid
			Max. length : ft.
	Model
				Outside	Minimum	Outside	Minimum	Indoor unit	Outdoor unit
			A
				diameter	Wall	diameter	Wall
					thickness		thickness
	MS24WN	MU24WN	50	[ 5/8	0.0315	[ 3/8	0.0285	Gas :16-15/16	Gas : 0
								Liquid :19-11/16	Liquid : 0

MAX. HEIGHT DIFFERENCE

Indoor unit

wHeight difference
should be within
25ft. regardless of	w Max. Height	Additional Piping
which unit, indoor	difference 25ft.	Max. length
or outdoor		A
position is high.

Outdoor unit

7

4 DATA

4-1. PERFORMANCE DATA

1) COOLING CAPACITY

MS24WN MU24WN

(208V/ 230V)

	Indoor air						Outdoor intake air DB temperature(˚F)
Model
	IWB		75			85			95			105			115
	(˚F)	TC	SHC	TPC	TC	SHC	TPC	TC	SHC	TPC	TC	SHC	TPC	TC	SHC	TPC
	71	27.9	13.9	1.93	26.1	13.0	2.12	24.5	12.2	2.28	22.8	11.3	2.40	21.0	10.4	2.50
MS24WN	67	26.4	16.7	1.82	24.6	15.5	2.01	22.8	14.4	2.17	21.2	13.4	2.30	19.5	12.3	2.41
	63	24.9	19.0	1.74	23.0	17.6	1.92	21.4	16.4	2.07	19.5	14.9	2.21	17.8	13.6	2.30

Notes 1.IWB : Intake air wet-bulb temperature.

TC : Total Capacity (x103 Btu/h), SHC : Sensible Heat Capacity (x103 Btu/h) TPC : Total Power Consumption (kW)

2. SHC is based on 80˚F of indoor intake air DB temperature.

2) COOLING CAPACITY CORRECTIONS

Model	Refrigerant piping length (one way)
	25ft. (std.)	40ft.	50ft.
MS24WN	1.0	0.954	0.923

4-2. PERFORMANCE CURVE

MS24WN

MU24WN

Cooling

SHF at rating condition = 0.63

Airflow = 487CFM

Bypass Factor = 0.16

	30
Btu/h)	28
	26										208V/230V
	24	Indoor
10				intake
(	22					air	WB
capacity									temperature				71
	20
													67
	18										(		63
											°F)
Total	16
(kW)	2.6										208V/230V		71
consumption	2.4												67
													63
	2.2											F)
											°
											(
	2.0									temperature
power	1.8							WB
							air
					intake
	1.6
Total		Indoor
	1.4
	65	70	75		80	85		90		95	100 105 110 115

Outdoor intake air DB temperature (°F)

8

4-3. Condensing pressure

Data is based on the condition of indoor humidity 50%. Air flow should be set at High.

MU24WN
	(PSIG)
	300
								86
	280							80
								75
								70
pressure	260
	240			temperature
Condensing
			Indoor	DB
	220
	200
	180
	160	75	80	85	90	95	100	104(°F)
	68 70

Outdoor ambient temperature

	(PSIG)
	100
	90
pressure	80			Indoor	DB temperature			86
								80
	70
Suction								75
								70
	60
	50
	40	75	80	85	90	95	100	104(°F)
	68 70
			Outdoor ambient temperature

9

4-4. STANDARD OPERATION DATA

		Model			MS24WN
		Item		Unit	Cooling
		Capacity		Btu / h	22,800
	Total
		SHF		—	0.63
		Input		kW	2.17
		INDOOR UNIT MODEL			MS24WN
		Power supply			115V 60Hz 1[
		Input		kW	0.071
		Fan motor current		A	0.62
	Electrical
		OUTDOOR UNIT MODEL			MU24WN
	circuit
		Power supply			208/230V 60Hz 1[
		Input		kW	2.099
		Comp. current		A	9.36/ 8.30
		Fan motor current		A	0.67/0.71
		Condensing pressure		PSIG	250
		Suction pressure		PSIG	71
		Discharge temperature		˚F	174
	Refrigerant	Condensing temperature		˚F	115
	circuit	Suction temperature		˚F	48
		Comp. shell bottom temp		˚F	158
		Ref. pipe length		ft.	25
		Refrigerant charge (R22)		—	4 Ib. 5 oz.
		Intake air temperature	DB	˚F	80
			WB	˚F	67
	Indoor	Discharge air temperature	DB	˚F	51
	unit		WB	˚F	50
		Fan speed (High)		rpm	1,280
		Airflow (High)		CFM	487(Wet)
		Intake air temperature	DB	˚F	95
	Outdoor		WB	˚F	—
	unit	Fan speed		rpm	750/820
		Airflow		CFM	1,589/1,765

POWER SUPPLY

MS24WN •Both wirings can be applied.				Control voltage
INDOOR UNIT 115V 60Hz 1[,		INDOOR UNIT		Power supply voltage to
	2wires
			Disconnect switch	serial signal circuit is 12V DC.
				Voltage between 1+ and 3--
			SIGNAL WIRE
				on in-out terminal block will be
			2 wires 12V DC
OUTDOOR UNIT	SIGNAL WIRE	OUTDOOR UNIT	115V 60Hz 1[,	12V DC peak.
	2 wires 12V DC		2 wires
			115V
	208/230V		208/230V
	60Hz 1[, 3 wires		60Hz 1[, 3 wires

10

4-5. OPERATING RANGE

(1) POWER SUPPLY

	Model	Rating		Guaranteed Voltage
Indoor unit	MS24WN	115V 60Hz 1[	Min. 103V				115V Max. 127V
Outdoor unit	MU24WN	208/230V 60Hz 1[	Min. 198V			208V 230V Max. 253V

(2) OPERATION

	Intake air		Indoor		Outdoor
Function	temperature
	Condition	DB (˚F)	WB (˚F)	DB (˚F)	WB (˚F)
	Standard temperature	80	67	95	—
Cooling	Maximum temperature	95	71	115	—
	Minimum temperature	67	57	67	—
	Maximum humidity		78%		—

4-6. OUTLET AIR SPEED AND COVERAGE RANGE

	Model	Mode	Function	Air flow	Air speed	Coverage
				(CFM)	(ft./sec.)	range (ft.)
	MS24WN	FAN	Dry	565	20.1	34.2
		COOL	Wet	487	17.2	29.4

●The air coverage range is the figure up to the position where the air speed is 1 ft./sec., when air is blown out horizontally from the unit properly at the High speed position.

The coverage range should be used only as a general guideline since it varies according to the size of the room and furniture arranged in the room.

4-7. ADDITIONAL REFRIGERANT CHARGE (R22(oz.))

	Outdoor unit			Refrigerant piping length (one way)
Model	precharged
	(up to 25ft.)	25ft.	30ft.		35ft.	40ft.	45ft.	50ft.
MS24WN MU24WN	4 lb. 5 oz.	0	0.81		1.62	2.43	3.24	4.05

CALCULATION : Xoz. = 0.81/ 5oz./ft. x (Additional Piping Length-25) ft.

11

5 OUTLINES AND DIMENSIONS

MS24WN Unit: inch

INDOOR UNIT

	Installation plate		Indoor unit
3-7/8				6-13/16		5/16
42-1/16					10-1/16	12-3/8
1-7/8	16-5/16		16-5/16	1/8	1-7/8
3-7/8
				6-13/16
	Wall hole [ 2-15/16
43-5/16	8-7/8	3/16
			Installation plate

				Liquid line [ 3/8 19-11/16
13/16		Air in		Gas line	[ 3/4 16-15/16
				{Insulation	[ 1-1/4 I.D
					[ 1-15/16 O.D
12-
2-3/16	31-1/8	9-15/16	8-15/16	Drain hose [5/8
		Air out		(Connected part O.D)
				Insulation [ 1-1/8
2-5/16	3/4
6-3/8
Wireless remote controller

12

MU24WN

OUTDOOR UNIT

7-9/32	19-11/16	7-9/32		11/16
	Air intake
Air intake			9/161-1/16	13	14-1/4
			1-

Unit: inch

Outdoor Unit-Necessary surrounding clearance

	7-7/8
	Note:Allow adequate
13/32	13/32 upper clearance

Front opening

Air outlet

	9/16
34-1/4	Terminal block for power line
	13/32

19-11/16

5-29/32

11-7/8	Terminal block for indoor and outdoor unit connection	Service space
		19-11/16

Outlet guide
installation hole
			Handle for moving
			Service panel
Handle for moving
A	1/18-720-5/8	7/18-18	17/32-17 23/32-17	3/4-21	33-1/2	3/4-1
3/8-17
					Refrigerant-pipe flared
					connection [5/8
					Refrigerant-pipe flared
					connection [3/8
					for front piping	1/16-2
1-9/16		20-5/8	2-3/8		Knock out hole	2-3/8
					(refrigerant,drainage	4-3/4 Knock out holes for
						power line 2-[1-1/16
		2-1/2o7/8 Oval holes	4-1/8		and wiring)
				-13/4
		(standard bolt M10)	-15/8
			1-5/16		Knock out hole
Drain hole [1-5/16					for right piping
					(refrigerant,drainage
			Bottom		and wiring)
			piping hole

Drain hole [1-5/16

Handle for moving

5-7/16

Rear piping hole 3-3/4

2-U-shaped notched holes

9/32 11-5/8 15/16

A

Side air intake

Conduit hole

Rear fresh air intake

NOTE: Do not wire12V DC and

115V AC in same conduit hole.

15/16

1-5/16

Outdoor Unit-Necessary surrounding clearance

(Concentrated installation) The upper side must be open.

		7-7/8	R1/4
4	13/32

1/2

For 10 units or less

39-3/8

R13/16

R13/16

3-1/8

1 max.

Standard bolt length

11/16	2-9/16

Front right piping holesdetail figures

13

6	WIRING DIAGRAM
MS24WN		MODEL WIRING DIAGRAM
INDOOR UNIT						CN201			4		RT13
									3
		TB					HIC1
	TO OUTDOOR		ORN			1			2		RT12
		3+				2			1
	UNIT
	CONNECTING					3		CN112			BLK
	WIRES	1-	VLT
	12V DC					4	NR11		CN	3	GRY
	FROM OUTDOOR	w							121		YLW
	UNIT	N	BLK				TRANS	C11	1		BRN MF
	CONNECTING										WHT
	WIRES	L1	RED			TAB12	F11 SR141		3
											RED
	POWER								4
(SUPPLY)
								CN211
	115V			CN		CN	CN
									CN
	1 phase										RT11
				151		102
							101 ELECTRONIC CONTROL P.C. BOARD 111
	60Hz
	TO OUTDOOR			15		3	3
	UNIT
	CONNECTING
	WIRE					DISPLAY	RECEIVER
				MV2 MV2	MV1	P.C.BOARD	P.C.BOARD
								REMOTE
w A disconnect may be required by local code.
								CONTROLLER
SYMBOL	NAME			SYMBOL		NAME		SYMBOL			NAME
C11	INDOOR FAN CAPACITOR			MV1	VANE MOTOR(HORIZONTAL)			RT12		INDOOR COIL THERMISTOR(MAIN)
F11	FUSE(3.15A)			MV2	VANE MOTOR(VERTICAL)			RT13		INDOOR COIL THERMISTOR(SUB)
HIC1	DC/DC CONVERTER			NR11	VARISTOR			SR141		SOLID STATE RELAY
MF	INDOOR FAN MOTOR (INNER PROTECTOR)			RT11	ROOM TEMPERATURE THERMISTOR			TB		TERMINAL BLOCK
NOTE:1. About the outdoor side electric wiring, refer to the outdoor unit electric wiring diagram for servicing.											SG79J618H02

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

3.Symbols below indicate;

:Terminal block, : Connector

MU24WN

MODEL WIRING DIAGRAM

MF

OUTDOOR UNIT

RT62

RT63

LEV

BLK

WHT

ORN

RED

FROM INDOOR UNIT

6

6

5

4

3

2

1

RED

CONNECTING WIRE

BLK

WHT

ORN

C2

TB2

+

3

CN662

CN724

1

2

3

CN711

FROM INDOOR UNIT

CONNECTING WIRES

1

-

X52

SR61

12V DC

N

X52

TAB52

TO INDOOR UNIT

COM

NO

CONNECTING

BLK

F61

WIRES

L1

T61

NR61

1

115V

3

1 phase 60Hz

TB1

RED

CN730

5

ORN

7

OUTDOOR ELECTRONIC CONTROL P.C. BOARD

L1

VLT

BLU

POWER

N

RED

SUPPLY

RED

WHT

C

208/230V

1

52C

2

1 phase 60Hz

L2

BLU

RED

S MC R

C1

BLU

A2

A1

BLK

52C

DSAR

GRN/YLW

RED

GROUND

BLU

SYMBOL	NAME	SYMBOL	NAME	SYMBOL	NAME
C1	COMPRESSOR CAPACITOR	MF	OUTDOOR FAN MOTOR(INNER PROTECTOR)	TB2	TERMINAL BLOCK
C2	OUTDOOR FAN CAPACITOR	NR61	VARISTOR	T61	TRANSFORMER
DSAR	SURGE ABSORBER	RT62	DISCHARGE TEMPERATURE THERMISTOR	X52	COMPRESSOR AUXILIARY RELAY
F61	FUSE(3.15A)	RT63	AMBIENT TEMPERATURE THERMISTOR	52C	COMPRESSOR CONTACTOR
LEV	EXPANSION VALVE COIL	SR61	SOLID STATE RELAY
MC	COMPRESSOR(INNER PROTECTOR)	TB1	TERMINAL BLOCK
NOTE:1. About the indoor side electric wiring, refer to the indoor unit electric wiring diagram for servicing.					SG79J606H02

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

3.Symbols below indicate;

:Terminal block, : Connector

14

7 REFRIGERANT SYSTEM DIAGRAM

							Unit: inch
MS24WN							MU24WN
INDOOR UNIT		Refrigerant pipe [5/8					OUTDOOR UNIT
						Strainer
		(with heat insulator)
						#100
Indoor	Indoor coil		Stop valve			SERVICE
	thermistor		(with service port)
heat					Discharge		Outdoor
exchanger	RT12(main)	Flared connection	SERVICE			PORT	heat
					temperature
			PORT		thermistor		exchanger
	Indoor coil		FUSIBLE		RT62
	thermistor
	RT13(sub)		PLUG
Room temperature			Accumulator
thermistor							Ambient
RT11					Compressor
							temperature
					Capillary tube		thermistor
	Strainer				O.D.0.16 I.D.0.09 7-7/8		RT63
					(Upper path)		Capillary tube
	#50
							O.D.0.16 I.D.0.09 3-15/16
		Flared connection
					LEV		(Lower path)
						Strainer
						#100
			Stop valve	Capillary tube
		Refrigerant pipe [3/8		O.D.0.14 I.D.0.09 1-31/32
						Refrigerant flow in cooling
		(with heat insulator)

15