Mitsubishi Electric MSZ-SF15VA-E1 User manual

Models
MSZ-SF15VA - E1 , E2 , E3 , E4 , ER3 , ER4
MSZ-SF20VA - E1 , E2 , E3 , E4 , ER3 , ER4
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
INDOOR UNIT
SERVICE MANUAL
No. OBH555
REVISED EDITION-D
PARTS CATALOG (OBB555)
Revision D:
• MSZ-SF15/20VA- E4 , ER4 have been added.
Please void OBH555 REVISED EDITION-C.
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 ······························· 18
11. DISASSEMBLY INSTRUCTIONS ················· 30
Outdoor unit service manual
MXZ-B∙VA Series (OBH554)
MXZ-C∙VA Series (OBH584)
MXZ-D∙VA Series (OBH626)
MXZ-8A∙VA (OC316)
MXZ-8B∙VA (OCH480)
MXZ-E∙VA Series (OBH723)

2
MSZ-SF15VA - E1
MSZ-SF20VA - E1
1. New model
TECHNICAL CHANGES
1
Revision A:
• MSZ-SF15VA- E2 and MSZ-SF20VA- E2 have been added.
Use the specified refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.
MSZ-SF15VA - E1 MSZ-SF15VA - E2
MSZ-SF20VA - E1 MSZ-SF20VA - E2
1. Software has been changed for ERP.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and remove the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
Revision B:
• MSZ-SF15VA- E3 and MSZ-SF20VA- E3 have been added.
MSZ-SF15VA - E2 MSZ-SF15VA - E3
MSZ-SF20VA - E2 MSZ-SF20VA - E3
1. Model name has been changed.
Revision C:
• MSZ-SF15VA- ER3 and MSZ-SF20VA- ER3 have been added.
Revision D:
• MSZ-SF15/20VA- E4 , ER4 have been added.
MSZ-SF15VA - ER3
MSZ-SF20VA - ER3
1. New model
MSZ-SF15VA - E3 MSZ-SF15VA - E4
MSZ-SF20VA - E3 MSZ-SF20VA - E4
MSZ-SF15VA - ER3 MSZ-SF15VA - ER4
MSZ-SF20VA - ER3 MSZ-SF20VA - ER4
1. Logo design has been changed.
OBH555D

3
ACCESSORIES
Installation plate 1
Installation plate f 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
MSZ-SF15VA MSZ-SF20VA
PART NAMES AND FUNCTIONS
2
Front panel
Air f lter
Air inlet
Horizontal vane
Air outlet
Heat exchanger
Operation
Remote control
indicator lamp
receiving section
Emergency operation switch (E.O. SW)
Remote controller
OBH555D

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
Airf ow
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 ( E1 , E2 , E3 , ER3 )/SG15D ( E4 , ER4 )
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
OBH555D

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
OBH555D

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
OBH555D

7
MSZ-SF15VA - E1 , E2 MSZ-SF20VA - E1 , E2
WIRING DIAGRAM
6
MSZ-SF15VA - E4 , ER4 MSZ-SF20VA - E4 , ER4
MSZ-SF15VA - E3 , ER3 MSZ-SF20VA - E3 , ER3
OBH555D

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
OBH555D

9
8-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging JPG and JPS on the electronic control P.C. board.
(Refer to 10-7.)
• The set time for the ON/OFF timer can be reduced to 1 second for each minute.
• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to 3
seconds. Restarting the compressor, which takes 3 minutes, cannot be reduced.
8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
(MSZ-SF15/20VA- E1 , E2 , E3 , ER3 )
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 STOP/OPERATE (MSZ-
SF·VA- E4 , ER4 )/OPERATE/STOP (Other
models) button 2 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 modif 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.
MSZ-SF15VA MSZ-SF20VA
SERVICE FUNCTIONS
8
J1 J2
OBH555D

10
8-4. 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 disable “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 has 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
8-3. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT
(MSZ-SF15/20VA- E4 , ER4 )
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
To operate the indoor units individually with each remote controller, assign a number to each remote controller according
to the number of the indoor unit.
This setting can be set only when all the following conditions are met:
• The remote controller is powered OFF.
• Weekly timer is not set.
• Weekly timer is not being edited.
(1) Hold down button on the remote controller for 2 seconds to enter the pairing mode.
(2) Press button again and assign a number to each remote controller.
Each press of button advances the number in the following order: 1 → 2 → 3 → 4.
(3) Press button to complete the pairing setting.
OBH555D