Mitsubishi Electric MSZ-AP25VG User manual

SERVICE MANUAL
INDOOR UNIT
PARTS CATALOG (OBB788)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
No. OBH788
Outdoor unit service manual
MUZ-AP·VG(H) Series (OBH789)
MXZ-D·VA(H) Series (OBH626)
MXZ-E·VA(H) Series (OBH723)
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··············· 9
8. SERVICE FUNCTIONS ··································· 10
9. MICROPROCESSOR CONTROL ··················· 12
10. TROUBLESHOOTING····································· 19
11. DISASSEMBLY INSTRUCTIONS···················· 33
Models
MSZ-AP25VG -E1 , EN1
MSZ-AP35VG -E1 , EN1
MSZ-AP42VG -E1 , EN1
MSZ-AP50VG -E1 , EN1
MSZ-AP25VGK -E1 , EN1
MSZ-AP35VGK -E1 , EN1
MSZ-AP42VGK -E1 , EN1
MSZ-AP50VGK -E1 , EN1

2
1
<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.
MSZ-AP25VG
-E1 , EN1
MSZ-AP35VG
-E1 , EN1
MSZ-AP42VG
-E1 , EN1
MSZ-AP50VG
-E1 , EN1
MSZ-AP25VGK
-E1 , EN1
MSZ-AP35VGK
-E1 , EN1
MSZ-AP42VGK
-E1 , EN1
MSZ-AP50VGK
-E1 , EN1
1. New model
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.
TECHNICAL CHANGES
These models are compatible with the outdoor units with low standby power control.
Connecting these models to the MUZ-AP·VG(H) series outdoor units enables the low standby power control.
These models may be connected to the MUZ-AP·VG(H) series after once connected to the MXZ series and operated, for
example because of relocation. In that case, the MUZ-AP·VG(H) series outdoor units will not operate without taking a step.
Follow the procedure "Deleting the memorized abnormal condition" described in 10-2.1.
OBH788

3
ACCESSORIES
MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG
MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK
Model MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG
MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK
Installation plate 1
Installation plate fixing screw 4 × 25 mm 5
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
Battery (AAA) for remote controller 2
Operation indicator lamp
Remote control receiving
section
Air inlet
Front panel
Air outlet
Spec name plate
Air ¿lter
(Air purifying ¿lter)
Air cleaning ¿lter
(Silver-ionized air
puri¿er ¿lter, option) Horizontal vane Emergency
operation switch
Wi-Fi interface
MSZ-AP·VGK
Remote controller
PART NAMES AND FUNCTIONS
2
OBH788

4
Specifications and rated conditions of main electric parts
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 V DC
Varistor (NR11) 470 V
Terminal block (TB) 3P
Indoor model MSZ-AP25VG
MSZ-AP25VGK MSZ-AP35VG MSZ-AP35VGK MSZ-AP42VG MSZ-AP42VGK MSZ-AP50VG MSZ-AP50VGK
Power supply Single phase 230 V, 50 Hz
Electrical data
Power
input 1Cooling W19 24
Heating 26 32
Running
current 1Cooling A0.18 0.24
Heating 0.26 0.32
Fan motor
Model RC0J30CV
Current 1Cooling A0.18 0.24
Heating 0.26 0.32
Dimensions W × H × D mm 798 × 299 × 219
Weight kg 10.5
Special remarks
Air direction 5
Airflow
Cooling
Super High
m3/h
684 756
High 522 558 600
Med. 426 462 504
Low 354 390 432
Silent 294 324 360
Heating
Super High
m3/h
774 840
High 534 564 600
Med. 438 462 492
Low 354 366 390
Silent 294 318 336
Sound level
Cooling
Super High
dB(A)
42 44
High 36 38 40
Med. 30 34 36
Low 24 29 33
Silent 19 21 28
Heating
Super High
dB(A)
45 48
High 39 38 40 43
Med. 34 31 35 38
Low 24 29 33
Silent 19 21 28
Fan speed
Cooling
Super High
rpm
970 1,050
High 790 830 880
Med. 670 720 770
Low 580 630 680
Silent 500 540 590
Heating
Super High
rpm
1,070 1,140
High 800 840 880
Med. 690 720 750
Low 580 600 630
Silent 500 530 560
Fan speed regulator 5
Remote controller model SG17B
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 Wet-bulb temperature 24°C
Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature 15°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
1 Measured under rated operating frequency.
2 For multi system.
SPECIFICATION
3
OBH788

5
MSZ-AP25VG
MSZ-AP25VGK
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
45
NC-10
MSZ-AP35VG
MSZ-AP35VGK
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
45
NC-10
NOISE CRITERIA CURVES
4
Test conditions
Cooling: Dry-bulb temperature 27°C
Wet-bulb temperature 19°C
Heating: Dry-bulb temperature 20°C
Wet-bulb temperature 15°C
INDOOR UNIT WALL
MICROPHONE
0.8m
1m
MSZ-AP42VG
MSZ-AP42VGK
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
44
48
NC-10
MSZ-AP50VG
MSZ-AP50VGK
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
45
NC-10
OBH788

6
Unit: mm
193
60 19
62750 121
299
408
14
40
51
86 86225 225
168 145
33135247 68
43 214
44 213
255
22
256
233
798
5
219
4
87
124
129
100
MIN 39mm
MIN 20mm MIN 40mm
MIN 7mm
AIR OUT
AIR IN INSTALLATION PLATE
DRAIN HOSE
INSTALLATION PLATE 11×20 OBLONG HOLE
11×26 OBLONG HOLE
INDOOR UNIT
PIPING
IN CASE OF LEFT, LEFT BACK,OR LEFT UNDER PIPING (USING SPACER), MIN 116mm
WALL HOLE 65
(MSZ-AP25/35/42/50VG(K)- E1 )
(MSZ-AP25/35/42/50VG(K)- EN1 )
Piping
Insulation ø37 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
Piping
Insulation ø37 O.D
Liquid line ø6.35 - 0.5m (Flared connection ø6.35)
Gas line ø9.52 - 0.45m (Flared connection ø9.52)
Drain hose Insulation ø29 Connected part ø16 O.D
OUTLINES AND DIMENSIONS
5
MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG
MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK
OBH788

7
MSZ-AP25VG- E1 , EN1 MSZ-AP35VG- E1 , EN1 MSZ-AP42VG- E1 , EN1
WIRING DIAGRAM
6
MSZ-AP50VG- E1 , EN1
OBH788

8
MSZ-AP25VGK- E1 , EN1 MSZ-AP35VGK- E1 , EN1 MSZ-AP42VGK- E1 , EN1
MSZ-AP50VGK- E1 , EN1
OBH788

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
REFRIGERANT SYSTEM DIAGRAM
7
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
MSZ-AP25VG MSZ-AP35VG
MSZ-AP25VGK MSZ-AP35VGK
MSZ-AP42VG MSZ-AP50VG
MSZ-AP42VGK MSZ-AP50VGK
OBH788

10
SERVICE FUNCTIONS
8
MSZ-AP25VG MSZ-AP35VG MSZ-AP42VG MSZ-AP50VG
MSZ-AP25VGK MSZ-AP35VGK MSZ-AP42VGK MSZ-AP50VGK
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.)
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.
After you turn the breaker ON, the remote controller that first sends a signal to an indoor unit will be regarded as the
remote controller for the indoor unit.
Once they are set, the indoor unit will only receive the signal from the assigned remote controller afterwards.
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 1
minute. Restarting the compressor, which takes 3 minutes, cannot be reduced.
JR77
Indoor electronic
control P.C. board
LD201(M)
OBH788