Mitsubishi Electric MSZ-DM50VA User manual

CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS··················4
3. SPECIFICATION ········································5
4. NOISE CRITERIA CURVES··························6
5. OUTLINES AND DIMENSIONS·····················8
6. WIRING DIAGRAM·····································9
7. REFRIGERANT SYSTEM DIAGRAM···········10
8. SERVICE FUNCTIONS······························ 11
9. MICROPROCESSOR CONTROL ················13
10. TROUBLESHOOTING·······························17
11. DISASSEMBLY INSTRUCTIONS·················30
Outdoor unit service manual
MUZ-DM·VA Series (OBH781)
MXZ-DM•VA Series (OBH739)
MSZ-DM50VA
INDOOR UNIT
Models
MSZ-DM50VA -ER1
MSZ-DM60VA -ER1
MSZ-DM71VA -ER1
SERVICE MANUAL
NOTE:
RoHS compliant products have
<G> mark on the spec name plate.
No. OBH780
PARTS CATALOG (OBB780)

2
<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.
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.
OBH780

3
1TECHNICAL CHANGES
MSZ-DM50VA - ER1
MSZ-DM60VA - ER1
MSZ-DM71VA - ER1
1. New model
OBH780

4
ACCESSORIES
MSZ-DM50VA
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
2PART NAMES AND FUNCTIONS
Operation indicator lamp
Remote control
receiving section
Horizontal vane
Air inlet
Air ¿lter
Front panel
Air outlet Heat exchanger
Emergency operation switch
Remote controller
Air cleaning ¿lter [Silver-
ionized air purifier filter,
option]
Display section
Operation indicator lamp
Remote control
receiving section
Horizontal vane
Air inlet
Air ¿lter
Front panel
Air outlet Heat exchanger
Emergency operation switch
Air cleaning ¿lter
[Silver-ionized air purifier
filter, option]
Remote controller
MSZ-DM60VA MSZ-DM71VA
OBH780

5
3SPECIFICATION
Indoor model MSZ-DM50VA MSZ-DM60VA MSZ-DM71VA
Power supply Single phase 230 V, 50 Hz
Breaker Capacity A 12 16
Electrical data
Power input 1 (Total) Cooling W2,050 1,900 2,330
Heating 1,480 1,970 2,440
Running current 1
(Total) Cooling A9.0 8.4 10.3
Heating 6.6 8.7 10.8
Power factor 1 (Total) Cooling %99 98
Heating 97 98
Starting current 1 (Total) A 9.0 8.7 10.8
Fan motor
Model RC0J40-QA RC0J30-MD
Current 1 Cooling A0.27 0.49
Heating 0.34 0.49
Dimensions W × H × D mm 799 × 290 × 232 923 × 305 × 250
Weight kg 9 13
Special remarks
Air direction 5
Airflow
Cooling
Super High
m3/h
772 1,192
High 667 900
Med. 547 729
Low 380 555 598
Heating
Super High
m3/h
861 1,192
High 667 957 981
Med. 497 752 763
Low 364 565 619
Sound level
Cooling
Super High
dB(A)
43 50
High 40 44
Med. 36 38
Low 28 31 33
Heating
Super High
dB(A)
47 49
High 41 44
Med. 34 38
Low 27 31 33
Fan speed
Cooling
Super High
rpm
1,120 1,250
High 1,000
Med. 860 850
Low 660 690 730
Heating
Super High
rpm
1,220 1,250
High 1,000 1,050 1,070
Med. 800 870 880
Low 640 700 750
Fan speed regulator 4
Remote controller model RH16A
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 rated conditions of main electric parts
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 V DC
Varistor
(NR11) 470 V
Terminal block (TB) 5P
OBH780

6
INDOOR UNIT WALL
MICROPHONE
0.8m
1m
Test conditions
Cooling : Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Heating : Dry-bulb temperature 20°C
4NOISE CRITERIA CURVES
MSZ-DM50VA
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
45
47
NC-10
OBH780

7
INDOOR UNIT WALL
MICROPHONE
0.8m
1m
Test conditions
Cooling : Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Heating : Dry-bulb temperature 20°C
MSZ-DM60VA MSZ-DM71VA
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
50
49
NC-10
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
50
49
NC-10
OBH780

8
MSZ-DM50VA Unit: mm
5OUTLINES AND DIMENSIONS
MSZ-DM50VA
2325
69
41
799
785 7
290
12063049
57
80
42
43
69
57
42
7
103
130
100
(57°)
225 225 80.5 80.5
61.5
59.5340338
41
42
249
248 21.5
3
167 157
207.5
206.5
172
14
46
Air in
Installation plate
Piping
Drain hose
Air out
11×26 Oblong hole 11×20 Oblong hole
Installation plate
Indoor unit
Wall hole Ø65
132
56 18
Piping
Insulation Ø37 O.D
Liquid line Ø7.0 - 0.39m (Flared connection Ø6.35)
Gas line Ø9.52 - 0.34m (Flared connection Ø12.7)
Drain hose
Insulation Ø28 Connected part Ø16 O.D
MSZ-DM60VA MSZ-DM71VA
Piping
Insulation Ø50 O.D
Liquid line Ø8 - 0.39m (Flared connection Ø6.35)
Gas line Ø12 - 0.34m (Flared connection Ø15.88)
Drain hose
Insulation Connected part Ø16 O.D
MSZ-DM60VA
MSZ-DM71VA
Piping
Insulation Ø50 O.D
Liquid line Ø8 - 0.39m (Flared connection Ø9.52)
Gas line Ø12 - 0.34m (Flared connection Ø15.88)
Drain hose
Insulation Connected part Ø16 O.D
132
56
OBH780

9
6WIRING DIAGRAM
MSZ-DM60VA MSZ-DM71VA
MSZ-DM50VA
OBH780

10
Unit: mm
7REFRIGERANT SYSTEM DIAGRAM
MSZ-DM50VA
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe ø12.7
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Indoor coil
thermistor
RT13
MSZ-DM60VA MSZ-DM71VA
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe ø15.88
(with heat insulator)
Refrigerant pipe ø6.35 (MSZ-DM60VA)
ø9.52 (MSZ-DM71VA)
(with heat insulator)
Indoor coil
thermistor
RT12
Indoor coil
thermistor
RT13
OBH780