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

SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Models

No. OBH555

MSZ-SF15VA MSZ-SF20VA -

E1 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

NOTE:

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

PARTS CATALOG (OBB555)

TECHNICAL CHANGES

MSZ-SF15VA MSZ-SF20VA -

1. New model

E1 E1

PART NAMES AND FUNCTIONS

MSZ-SF15VA MSZ-SF20VA

Front panel

Air ﬁ lter

Air inlet

Horizontal vane

Air outlet

Heat exchanger

Remote controller

Emergency operation switch (E.O. SW)

ACCESSORIES

Installation plate 1 Installation plate ﬁ xing 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

Operation

indicator lamp

Remote control

receiving section

Electrical

data

Fan

motor Dimensions W × H × D mm 760 × 250 × 168 Weight kg

Special remarks

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

2 For multi system.

SPECIFICATION

Indoor model MSZ-SF15VA MSZ-SF20VA

Power supply Single phase 230 V, 50 Hz

Power input 1

Running current 1

Model RC0J40-FM

Current 1

Air direction 5

Airﬂ ow

Sound level

Fan speed

Fan speed regulator 5

1 Measured under rated operating frequency.

Cooling Heating 17 19 Cooling Heating 0.17 0.19

Cooling Heating 0.17 0.19

Super High High Med.

Cooling

Low Silent Super High High Med. Low

Heating

Silent Super High High Med.

Cooling

Low Silent Super High High Med. Low

Heating

Silent Super High High 1,300 Med. 1,130 Low 980

Cooling

Silent 900 Super High High 1,350 Med. 1,160 Low 1,030

Heating

Silent 910

dB(A)

rpm

17 19

0.17 0.19

7.7

384 414

330 276 234 210

408 438

360 300 264 222

40 42

35 30 26 21

40 42

35 30 26 21

1,500 1,600

Specifications and rating conditions of main electric parts

Fuse Horizontal vane motor (MV) 12 VDC Varistor (NR11) S10K300E2K1 Terminal block

F11)

(

(TB)

T3.15AL250V

NOISE CRITERIA CURVES

MSZ-SF15VA

FAN SPEED

Super High

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

FUNCTION

COOLING HEATING

SPL(dB(A))

40 40

NC-10

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

MSZ-SF20VA

FAN SPEED

Super High

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

FUNCTION

COOLING

HEATING

SPL(dB(A))

42 42

NC-10

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

Test conditions

Cooling: Dry-bulb temperature 27°C

Wet-bulb temperature 19°C

Heating: Dry-bulb temperature 20°C

INDOOR UNIT

WALL

0.8m

MICROPHONE

OUTLINES AND DIMENSIONS

MSZ-SF15VA MSZ-SF20VA

1120 Oblong hole

208

166

Installation plate

Indoor unit

295

335

145

760 740

155

145

300

Wall hole 65

1120 Oblong hole

167

21.5

187

Unit: mm

209

5 168

193

202

250

505

Insulation

Liquid line

Piping

Gas line

Drain hose

Installation plate

Piping

110

Drain hose

179

Air out

35 O.D

ØØ

6.35-0.39m (Flared connection 6.35)

9.52-0.34m (Flared connection 9.52)

Insulation 28 Connected part 16 O.D

MSZ-SF15VA MSZ-SF20VA

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

MSZ-SF15VA MSZ-SF20VA

Indoor heat exchanger

Indoor coil thermistor RT13 (sub)

Room temperature thermistor RT11

Indoor coil thermistor RT12 (main)

Unit: mm

Refrigerant pipe ø9.52 (with heat insulator)

Flared connection

Refrigerant pipe ø6.35 (with heat insulator)

Refrigerant flow in cooling Refrigerant flow in heating

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:

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.

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.

Table 1

1 unit operation 2 units operation 3 units operation 4 units operation

No. 1 unit No modiﬁ cation 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.

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

CN211

CN112

JR07

IC112

Indoor electronic control P.C. board

CN 111

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 can-

celled.

• 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.

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