Mitsubishi Electric MSZ-SF15VA - E1 User manual

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
SPLIT-TYPE AIR CONDITIONERS
Outdoor unit service manual
MXZ-B·VA Series (OBH554)
MXZ-8A140A (OC316)
SERVICE MANUAL No. OBH555
INDOOR UNIT
PARTS CATALOG (OBB555)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Models
MSZ-SF15VA - E1
MSZ-SF20VA - E1
MSZ-SF15VA - E1
MSZ-SF20VA - E1

2
MSZ-SF15VA - E1
MSZ-SF20VA - E1
1. New model
TECHNICAL CHANGES
1

3
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
MSZ-SF15VA MSZ-SF20VA
PART NAMES AND FUNCTIONS
2
Front panel
Air filter
Air inlet
Horizontal vane
Air outlet
Heat exchanger
Operation
Remote control
indicator lamp
receiving section
Emergency operation switch (E.O. SW)
Remote controller

4
Indoor model MSZ-SF15VA MSZ-SF20VA
Power supply Single phase 230 V, 50 Hz
Electrical data
Power
input 1
Cooling W17 19
Heating 17 19
Running
current 1
Cooling A0.17 0.19
Heating 0.17 0.19
Fan motor
Model RC0J40-FM
Current
1
Cooling A0.17 0.19
Heating 0.17 0.19
Dimensions W × H × D mm 760 × 250 × 168
Weight kg 7.7
Special remarks
Air direction 5
Airflow
Cooling
Super High
m3/h
384 414
High 330
Med. 276
Low 234
Silent 210
Heating
Super High
m3/h
408 438
High 360
Med. 300
Low 264
Silent 222
Sound level
Cooling
Super High
dB(A)
40 42
High 35
Med. 30
Low 26
Silent 21
Heating
Super High
dB(A)
40 42
High 35
Med. 30
Low 26
Silent 21
Fan speed
Cooling
Super High
rpm
1,500 1,600
High 1,300
Med. 1,130
Low 980
Silent 900
Heating
Super High
rpm
1,500 1,600
High 1,350
Med. 1,160
Low 1,030
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
SPECIFICATION
3

5
MSZ-SF15VA
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
HEATING
42
42
NC-10
MSZ-SF20VA
Test conditions
Cooling: Dry-bulb temperature 27°C
Wet-bulb temperature 19°C
Heating: Dry-bulb temperature 20°C
INDOOR UNIT WALL
MICROPHONE
0.8m
1m
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
HEATING
40
40
NC-10
NOISE CRITERIA CURVES
4

6
Unit: mm
MSZ-SF15VA MSZ-SF20VA
OUTLINES AND DIMENSIONS
5
1120 Oblong hole
Installation plate
1120 Oblong hole
Indoor unit
Wall hole 65
Ø
61 295 155 78
45 335 300
145 145 81
208
166
42
167
187
209
21.5
41
760
740 10
5 168
45 56 505 179
56
202
250
8
110
41
56
Installation plate
Piping
Drain hose
Air out
60
193
18
56 56
47
43
Piping
Insulation
Liquid line
Gas line
Drain hose
35 O.D
6.35-0.39m (Flared connection 6.35)
Ø
ØØ
9.52-0.34m (Flared connection 9.52)
ØØ
Insulation 28 Connected part 16 O.D
ØØ

7
MSZ-SF15VA MSZ-SF20VA
WIRING DIAGRAM
6

8
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
Unit: mm
MSZ-SF15VA MSZ-SF20VA
REFRIGERANT SYSTEM DIAGRAM
7

9
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 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.
MSZ-SF15VA MSZ-SF20VA
SERVICE FUNCTIONS
8
J1 J2

10
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.)
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.
CN112
R111
Indoor electronic
control P.C. board
JR07
IC112
CN151
CN111
CN211
D