Mitsubishi MSZ-SF15VA-E1, MSZ-SF20VA-E1 Service Manual

SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL	No. OBH555

Models

MSZ-SF15VA - E1

MSZ-SF20VA - E1

MSZ-SF15VA - E1 MSZ-SF20VA - E1

Outdoor unit service manual

MXZ-B·VA Series (OBH554)

MXZ-8A140A (OC316)

CONTENTS

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

2.PART NAMES AND FUNCTIONS····················· 3

3.SPECIFICATION················································ 4

4.NOISE CRITERIA CURVES ······························ 5

5.OUTLINES AND DIMENSIONS ························ 6

6.WIRING DIAGRAM············································ 7

7.REFRIGERANT SYSTEM DIAGRAM ··············· 8

8.SERVICE FUNCTIONS ····································· 9

9.MICROPROCESSOR CONTROL ····················11

10.TROUBLESHOOTING····································· 17

11.DISASSEMBLY INSTRUCTIONS···················· 29

PARTS CATALOG (OBB555)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

1 TECHNICAL CHANGES

MSZ-SF15VA - E1 MSZ-SF20VA - E1

1. New model

2

2 PART NAMES AND FUNCTIONS

MSZ-SF15VA MSZ-SF20VA

Front panel

Air filter

Air inlet
	Remote controller
Horizontal vane
Air outlet	Emergency operation switch (E.O. SW)
Heat exchanger
Operation	Remote control
indicator lamp	receiving section
ACCESSORIES
Installation plate	1
Installation plate fixing screw 4 × 25 mm	5
Remote controller holder	1
Fixing screw for 3.5 × 16 mm (Black)	2
Battery (AAA) for remote controller	2
Wireless remote controller	1
Felt tape (Used for left or left-rear piping)	1

3

3				SPECIFICATION
				Indoor model				MSZ-SF15VA		MSZ-SF20VA
				Power supply				Single phase 230 V, 50 Hz
Electrical data	Power				Cooling	W		17		19
	current 1				Heating			0.17		0.19
						A
	input			1	Heating			17		19
	Running				Cooling			0.17		0.19
Fan motor	Model								RC0J40	-FM
	1				Heating	A		0.17		0.19
	Current				Cooling			0.17		0.19
Dimensions W × H × D						mm			760 × 250 × 168
Weight						kg			7.7
	Air direction								5
				Cooling	Super High			384		414
					High	m3/h			330
					Low				234
					Med.				276
	ow
					Silent				210
	fl
	Air			Heating	Super High			408		438
					High	m3/h			360
					Low				264
					Med.				300
					Silent				222
				HeatingCooling	Super High			40		42
Specialremarks					High				35
	Soundlevel				Low	dB(A)			26
					Med.				30
					Low				26
					Silent				21
					Super High			40		42
					High				35
					Med.	dB(A)			30
					Silent				21
				Cooling	Super High			1,500		1,600
					High				1,300
	speed				Med.	rpm			1,130
					Low				980
					Silent				900
	Fan			Heating	Super High			1,500		1,600
					High				1,350
					Low	rpm			1,030
					Med.				1,160
					Silent				910
	Fan			speed	regulator				5
Remote controller model									SG10D

NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor	Dry-bulb temperature 27°C		Wet-bulb temperature	19°C
Outdoor Dry-bulb temperature 35°C
Heating: Indoor	Dry-bulb temperature 20°C
Outdoor Dry-bulb temperature 7°C			Wet-bulb temperature	6°C
1 Measured under rated operating frequency.
2 For multi system.
Specifications and rating conditions of main electric parts
Fuse	(F11)		T3.15AL250V
Horizontal vane motor	(MV)		12 VDC
Varistor	(NR11)		S10K300E2K1
Terminal block	(TB)		3P

4

4 NOISE CRITERIA CURVES

MSZ-SF15VA

FAN SPEED FUNCTION SPL(dB(A))

LINE

		Super High		COOLING		40
				HEATING		40
BAR	90
0.0002 MICRO	80
	70							NC-70
dB re	60
LEVEL,
								NC-60
	50
PRESSURE
								NC-50
	40
								NC-40
SOUND
	30
BAND								NC-30
	20
OCTAVE
					NC-10			NC-20
	10
		125	250	500	1000	2000	4000	8000
	63

BAND CENTER FREQUENCIES, Hz

	MSZ-SF20VA
		FAN SPEED		FUNCTION		SPL(dB(A))		LINE
		Super High		COOLING		42
				HEATING		42
BAR	90
0.0002 MICRO	80
	70							NC-70
dB re	60
LEVEL,
								NC-60
	50
PRESSURE
								NC-50
	40
								NC-40
SOUND
	30
BAND								NC-30
	20
OCTAVE
					NC-10			NC-20
	10
		125	250	500	1000	2000	4000	8000
	63

BAND CENTER FREQUENCIES, Hz

	Test conditions	INDOOR UNIT
	Cooling: Dry-bulb temperature 27°C	WALL
	Wet-bulb temperature 19°C	1m
	Heating: Dry-bulb temperature 20°C
		0.8m
		MICROPHONE

5

5 OUTLINES AND DIMENSIONS

MSZ-SF15VA MSZ-SF20VA

Unit: mm

11 20 Oblong hole

Installation plate		61
208	166
42
Indoor unit		45

5 168

		11 20 Oblong hole
295	155	78	21.5
		167	187	209
145	145			41
335	300	81
	Wall hole Ø65
760
740		10

Installation plate

	202						Piping
		250
56						8
45			56	505	179	41	56
							Drain hose
						110
						Air out
60	18
193		47	56		56	43

Piping

Insulation Liquid line Gas line

Drain hose

Ø35 O.D

Ø6.35-0.39m (Flared connection Ø 6.35)

Ø9.52-0.34m (Flared connection Ø9.52)

Insulation Ø28 Connected part Ø16 O.D

6

6 WIRING DIAGRAM

MSZ-SF15VA MSZ-SF20VA

7

7 REFRIGERANT SYSTEM DIAGRAM

MSZ-SF15VA MSZ-SF20VA

Unit: mm

Refrigerant pipe ø9.52

(with heat insulator)

Indoor coil

Indoor

thermistor

heat

RT12 (main)

exchanger

Flared connection

Indoor coil thermistor RT13 (sub)

Room temperature thermistor

RT11

Flared connection

Refrigerant pipe ø6.35 (with heat insulator)

Refrigerant flow in cooling

Refrigerant flow in heating

8

8 SERVICE FUNCTIONS

MSZ-SF15VA MSZ-SF20VA

8-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. (Refer to 10-7.)

Set time: 1 minute → 1 second

Set time: 3 minutes → 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit-of JPG and JPS.)

8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION

A maximum of 4 indoor units with wireless remote controllers can be used in a room.

In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the number of the indoor unit.

How to modify the remote controller P.C. board

Remove batteries before modification.

The board has a print as shown below:

J1 J2

NOTE: For modification, take out the batteries and press the OPERATE/STOP (ON/ OFF) button twice or 3 times at first.

After modification, put back the batteries then press the RESET button.

The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1. After modification, press the RESET button.

Table 1

	1 unit operation	2 units operation	3 units operation	4 units operation
No. 1 unit	No modification	Same as at left	Same as at left	Same as at left
No. 2 unit	—	Solder J1	Same as at left	Same as at left
No. 3 unit	—	—	Solder J2	Same as at left
No. 4 unit	—	—	—	Solder both J1 and J2

How to set the remote controller exclusively for particular indoor unit

After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit.

The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are set.

The setting will be cancelled if the breaker is turned OFF, or the power supply is shut down. Please conduct the above setting once again after the power has restored.

9

8-3. AUTO RESTART FUNCTION

When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power.

Operation

If the main power has been cut, the operation settings remain.

After the power is restored, the unit restarts automatically according to the memory. (However, it takes at least 3 minutes for the compressor to start running.)

How to release “AUTO RESTART FUNCTION”

Turn off the main power for the unit.

Solder the jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 10-7.)

R111

CN112

CN211

D

JR07

IC112

	CN111
Indoor electronic
control P.C. board	CN151

NOTE:

•The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller.

•If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is cancelled.

•If the unit has been off with the remote controller before power failure, the auto restart function does not work as the power button of the remote controller is OFF.

•To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the same time.

•When some air conditioners are connected to the same supply system, if they are operated before power failure, the starting current of all the compressors may flow simultaneously at restart.

Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding to the system that allows the units to start one by one.

10