Mitsubishi Electric OBH839 User manual

INDOOR UNIT
SERVICE MANUAL
Outdoor unit service manual
MUZ-AP∙VG Series (OBH839)
MXZ-D∙VA Series (OBH626)
MXZ-E∙VA Series (OBH723)
MXZ-F∙VF Series (OBH790)
No. OBH838A
PARTS CATALOG (OBB838A)
MSZ-AP15VG
MSZ-AP20VG
CONTENTS
1. TECHNICAL CHANGES ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 3
2. PART NAMES AND FUNCTIONS∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 4
3. SPECIFICATION∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 5
4. NOISE CRITERIA CURVES∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 6
5. OUTLINES AND DIMENSIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 7
6. WIRING DIAGRAM∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 8
7. REFRIGERANT SYSTEM DIAGRAM∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 9
8. SERVICE FUNCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 10
9. MICROPROCESSOR CONTROL ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙11
10. TROUBLESHOOTING∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 18
11. DISASSEMBLY INSTRUCTIONS∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 30
Models
MSZ-AP15VG -E1 , ET1 , ER1
MSZ-AP20VG -E1 , ET1 , ER1
OBB838 is void.
Revision A:
• MSZ-AP15/20VG- ER1 have been added.

2
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.
<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 A:
• MSZ-AP15/20VG- ER1 have been added.
OBH838A

3
TECHNICAL CHANGES
1
MSZ-AP15VG - E1 , ET1 , ER1
MSZ-AP20VG - E1 , ET1 , ER1
1. New model
These models are compatible with the outdoor units with low standby power control.
Connecting these models to the MUZ-AP∙VG series outdoor units enables the low standby power control.
These models may be connected to the MUZ-AP∙VG series after once connected to the MXZ series and operated, for exam-
ple because of relocation. In that case, the MUZ-AP∙VG series outdoor units will not operate without taking a step. Follow the
procedure "Deleting the memorized abnormal condition" described in 10-2.1.
OBH838A

4
ACCESSORIES
Installation plate 1
Installation plate xing screw 4 × 25 mm 5
Wireless remote controller 1
Felt tape (Used for left or left-rear piping) 1
Battery (AAA) for remote controller 2
MSZ-AP15VG MSZ-AP20VG
PART NAMES AND FUNCTIONS
2
Remote controller
Operation
indicator lamp
Remote control
receiving section
Horizontal vane
Air outlet
Air filter
Heat exchanger Emergency
operation switch
Front panel
Spec name plate
Air inlet
OBH838A

5
Indoor model MSZ-AP15VG MSZ-AP20VG
Power supply Single phase 230 V, 50 Hz
Electrical data
Power
input 1 Cooling W17 19
Heating 17 19
Running
current 1Cooling A0.17 0.19
Heating 0.17 0.19
Fan motor
Model RC0J30-CW
Current 1Cooling A0.17 0.19
Heating 0.17 0.19
Dimensions W × H × D mm 760 × 250 × 178
Weight kg 8.2
Special remarks
Air direction 5
Airow
Cooling
Super High
m3/h
384 414
High 330 330
Med. 276 276
Low 234 234
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
1,430 1,530
High 1,250 1,250
Med. 1,080 1,080
Low 940 940
Silent 860
Heating
Super High
rpm
1,430 1,530
High 1,290
Med. 1,110
Low 990
Silent 870
Fan speed regulator 5
Remote controller model SG19C
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.
Specifications and rating conditions of main electric parts
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 V DC
Varistor (NR11) 470 V
Terminal block (TB) 3P
SPECIFICATION
3
OBH838A

6
MSZ-AP15VG
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-AP20VG
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
OBH838A

7
Unit: mm
MSZ-AP15VG MSZ-AP20VG
OUTLINES AND DIMENSIONS
5
Piping
Insulation ø35 O.D
Liquid line ø6.35 - 0.39m (Flared connection ø6.35)
Gas line ø9.52 - 0.34m (Flared connection ø9.52)
Drain hose Insulation ø29 Connected part ø16 O.D
193
60 19
155295
167.5
187.5
209
21.5
41
3
299.5
145145
335
(45)
166.5
208
61 78
42
740
760
178 5
250
335.5
14.551
100
11
96
166
80.5
50
10
(66) 505 189
INDOOR UNIT
INSTALLATION PLATE
11×26 OBLONG HOLE 11×20 OBLONG HOLE
WALL HOLE
ø 65
IN CASE OF LEFT, LEFT BACK,OR LEFT UNDER PIPING (USING SPACER), MIN 120.5mm
MIN 44.5mm
MIN 14mm
MIN 30mm
MIN 20mm
AIR IN
PIPING DRAIN HOSE
INSTALLATION PLATE
AIR OUT
OBH838A

8
MSZ-AP15VG - E1 , ER1 MSZ-AP20VG - E1 , ER1
MSZ-AP15VG - ET1 MSZ-AP20VG - ET1
WIRING DIAGRAM
6
ALICI KARTI
SİVİÇ KARTI GÖSTERGE KARTI
RÖLE
İÇ ÜNİTE ELEKTRONİK
KONTROL KARTI
3. Sembolleri gösterir
2. Sadece bakır besleme kablosu kullanın
NOTLAR
:
1. Dış ünite elektronik kablolaması için dış ünite
elektronik kablo devre şemasını referans alınız.
SİGORTA
(T3.15AL250V)
FAN MOTORU
VARİSTÖR
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ(ANA)
BORU SICAKLIK
TERMİSTÖRÜ(YARDIMCI)
DIŞ ÜNİTEYE
Terminal bloğu
Konektör
PARÇA ADI
TERMİNAL BLOĞU
SEMBOL SEMBOL
KANAT MOTORU
(YATAY ÜST)
KANAT MOTORU
(YATAY ALT)
RESİSTÖR
PARÇA ADI
OBH838A

9
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-AP15VG MSZ-AP20VG
REFRIGERANT SYSTEM DIAGRAM
7
OBH838A

10
8-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging the timer short mode point 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. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT
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.
MSZ-AP15VG MSZ-AP20VG
SERVICE FUNCTIONS
8
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 disable “AUTO RESTART FUNCTION”
Turn off the main power for the unit.
Cut the jumper wire to JR77 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 start-
ing 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
JR77
IC112
CN151
CN111
CN211
OBH838A