Mitsubishi Electric MUZ-DM50VA-ER1 User manual

Models
MUZ-DM50VA -ER1
MUZ-DM60VA -ER1
MUZ-DM71VA -ER1
OUTDOOR UNIT
SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS··················3
3. SPECIFICATION ········································4
4. NOISE CRITERIA CURVES··························6
5. OUTLINES AND DIMENSIONS·····················8
6. WIRING DIAGRAM·····································9
7. REFRIGERANT SYSTEM DIAGRAM···········10
8. PERFORMANCE CURVES ························12
9. ACTUATOR CONTROL·····························24
10. SERVICE FUNCTIONS······························25
11. TROUBLESHOOTING·······························26
12. DISASSEMBLY INSTRUCTIONS·················44
HFC
utilized
R410A
Indoor unit service manual
MSZ-DM•VA Series (OBH780)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
PARTS CATALOG (OBB781)
No. OBH781
REVISED EDITION-A
MUZ-DM50VA
Please void OBH781.
Revision A:
• "6. WIRING DIAGRAM" has been corrected.

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.
TECHNICAL CHANGES
1
MUZ-DM50VA - ER1
MUZ-DM60VA - ER1
MUZ-DM71VA - ER1
1. New model
Revision A:
• "6. WIRING DIAGRAM" has been corrected.
OBH781A

3
2PART NAMES AND FUNCTIONS
ACCESSORIES
Drain socket 1
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(Back and side)
MUZ-DM50VA
MUZ-DM60VA MUZ-DM71VA
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
OBH781A

4
3SPECIFICATION
Outdoor model MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated frequency (Min.-Max.) Cooling kW 5.0 (1.3 - 5.0) 6.1 (1.7-7.1) 7.1 (1.8-7.1)
Heating 5.4 (1.4 - 6.5) 6.8 (1.5-8.4) 8.1 (1.5-8.5)
Breaker Capacity A 12 16
Electrical data
Power input 1 (Set) Cooling W2,050 1,900 2,330
Heating 1,480 1,970 2,440
Running current 1 (Set) Cooling A9.0 8.4 10.3
Heating 6.6 8.7 10.8
Power factor 1 (Set) Cooling %99 98
Heating 97 98
Starting current 1 (Set) A 9.0 8.7 10.8
Coefficient of performance
(COP) 1 (Set) Cooling 2.44 3.21 3.05
Heating 3.65 3.45 3.32
Compressor
Model SNB130FGBHT SNB130FGBMT
Output W 900
Current 1Cooling A8.5 7.0 8.8
Heating 5.9 7.4 9.4
Refrigeration oil (Model) L 0.45 (NEO22) 0.35 (FV50S)
Fan motor Model RC0J50-FA RC0J77-AF
Current 1Cooling A0.27 0.94 0.97
Heating 0.34 0.94
Dimensions W × H × D mm 800 × 550 × 285 840 × 880 × 330
Weight kg 36 55
Special remarks
Dehumidification Cooling L/h 2.2 1.6 2.4
Air flow 1
Cooling High
m3/h
1,872 3,244
Med. 1,872 2,871 2,960
Low 1,086 1,566
Heating High 2,088 2,871 Med. 1,776 2,871
Low 1,386 2,331
Sound level 1Cooling dB(A) 50 55
Heating 51 55
Fan speed
Cooling High
rpm
810 950
Med. 810 840
Low 490 450
Heating High 900 810 Med. 770 810
Low 610 650
Fan speed regulator 3
Refrigerant filling capacity (R410A) kg 1.15 1.80
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
Refrigerant piping length (one way): 5 m
1 Measured under rated operating frequency.
OBH781A

5
Specifications and rated conditions of main electric parts
Model
Item MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA
Smoothing capacitor (C61, C62, C63) 600 μF/ 620 μF 420 V
Diode module (DB61) 15 A 600 V 25 A 600 V
Fuse (F61) T20AL250V
(F701, F801, F901) T3.15AL250V
Power module (IC700) 20 A 600 V (IC820) 20 A 600 V
(IC932) 8 A 600 V
Expansion valve coil (LEV) 12 V DC
Reactor (L61) 23 mH
Circuit protection (PTC64, PTC65) 33 Ω
Terminal block (TB) 5 P
Relay (X63) 3 A 250 V
(X64) 20 A 250 V
R.V. coil (21S4) 220 - 240 V AC
OBH781A

6
Test conditions
Cooling : Dry-bulb temperature 35°C
Heating : Dry-bulb temperature 7°C Wet-bulb temperature 6°C
OUTDOOR UNIT
MICROPHONE
1m
4NOISE CRITERIA CURVES
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
HEATING
50
NC-10
51
MUZ-DM50VA
OBH781A

7
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
HEATING
55
NC-10
55
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
HEATING
55
NC-10
55
MUZ-DM60VA MUZ-DM71VA
Test conditions
Cooling: Dry-bulb temperature 35°C
Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C
OUTDOOR UNIT
MICROPHONE
1 m
OBH781A

8
5OUTLINES AND DIMENSIONS
MUZ-DM60VA MUZ-DM71VA
417.5
40
42
Drain hole
175 500
330
50
Air in
Air out 2-holes 10 21
360
840
109 81
880
452
Service panel
99.5
164.5
195
35
44
Liquid refrigerant pipe joint
Refrigerant pipe
(flared) Ø 6.35 (MUZ-DM60VA)
Ø 9.52 (MUZ-DM71VA)
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø 15.88
100 mm
or more
REQUIRED SPACE
100 mm or
more
350 mm or
more
Air in
*1 500 mm or more when front
and sides of the unit are clear
*2 When any 2 sides of left, right
and rear of the unit are clear
Clear *1
500 mm or
more *2
MUZ-DM50VA
10
69
800
302.5
500 Bolt pitch for installation
150
22.3
Handle
550
280
164.5
99.5
170.5
23 Service panel
Service port
285
344.5
44
400
Air in
Air out
Air in
17.5
Bolt pitch for
installation
304~325
40
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø12.7
43°
35°
2 - 10 X 21 Oval hole
REQUIRED SPACE
350 mm or more
100 mm or more
Drain hole ø42
100 mm or more
*1 100 mm or more when front
and sides of the unit are clear
*2 When any 2 sides of left, right
and rear of the unit are clear
Clear *1
200 mm or
more *2
OBH781A

9
6WIRING DIAGRAM
MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA
OBH781A

10
Unit : mm
7REFRIGERANT SYSTEM DIAGRAM
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainer)
Stop valve
(with service port)
Refrigerant flow in cooling
Compressor
Muffler
Muffler
4-way valve
Refrigerant flow in heating
Refrigerant pipe ø12.7
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
R.V. coil
heating ON
cooling OFF
Strainer
#100
Capillary tube
ø 4.0 × ø 2.4 × 240
Capillary tube
ø 3.0 × ø 2.0 × 210
LEV
Outdoor heat
exchanger
temperature
thermistor
RT68
MUZ-DM50VA
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
Stop valve
Capillary tube
ø 4.0 × ø 2.4 × 100 Capillary tube ø 4.0 × ø 2.4 × 200 Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe
ø 15.88
(with heat insulator)
Refrigerant pipe ø 6.35(DM60)
Refrigerant pipe
ø 9.52(DM71)
(with heat insulator)
LEV R.V. coil
heating ON
cooling OFF
Muffler
#100
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Strainer
#100
Muffler
Capillary tube
ø3.0×ø2.0×200(×4)
MUZ-DM60VA MUZ-DM71VA
OBH781A