Mitsubishi Electric MUFZ-KJ25VE-E1 User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 4
4. NOISE CRITERIA CURVES······························ 6
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM············································ 8
7. REFRIGERANT SYSTEM DIAGRAM············· 10
8. PERFORMANCE CURVES····························· 12
9. ACTUATOR CONTROL··································· 23
10. SERVICE FUNCTIONS···································· 24
11. TROUBLESHOOTING····································· 25
12. DISASSEMBLY INSTRUCTIONS···················· 46
Models
SPLIT-TYPE AIR CONDITIONERS
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH667
REVISED EDITION-B
OUTDOOR UNIT
Indoor unit service manual
MFZ-KJ•VE Series (OBH666)
PARTS CATALOG (OBB667)
MUFZ-KJ25VE-E1 , ER1
MUFZ-KJ35VE-E1 , ER1
MUFZ-KJ50VE-E1 , ER1
MUFZ-KJ25VE
MUFZ-KJ35VE
Please void OBH667 REVISED EDITION-A.
Revision B:
• MUFZ-KJ25VE -
ER1
, MUFZ-KJ35VE -
ER1
and
MUFZ-KJ50VE -
ER1
have been added.

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.
Revision A:
• MUFZ-KJ50VE -
E1
has been added.
Revision B:
• MUFZ-KJ25VE -
ER1
, MUFZ-KJ35VE -
ER1
and MUFZ-KJ50VE -
ER1
have been added.
OBH667B

3
MUFZ-KJ25VE - E1 ,ER1
MUFZ-KJ35VE - E1 ,ER1
MUFZ-KJ50VE - E1 ,ER1
1. New model
TECHNICAL CHANGES
1
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
MUFZ-KJ25VE
MUFZ-KJ35VE
PART NAMES AND FUNCTIONS
2
ACCESSORIES
Model MUFZ-KJ25VE MUFZ-KJ35VE
MUFZ-KJ50VE
Drain socket 1
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
MUFZ-KJ50VE
OBH667B

4
Outdoor model MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated frequency (Min.-Max.)
Cooling kW 2.5 (0.5 - 3.4) 3.5 (0.5 - 3.7) 5.0 (1.6 - 5.7)
Heating 3.4 (1.2 - 4.6) 4.3 (1.2 - 5.5) 6.0 (2.2 - 8.2)
Breaker Capacity A 10 16
Electrical data
Power input 1 (Total) Cooling W540 940 1,410
Heating 770 1,110 1,610
Running current 1
(Total)
Cooling A2.7 4.2 6.2
Heating 3.6 5.1 7.1
Power factor 1 (Total) Cooling %87 98
Heating 91 93 98
Starting current 1 (Total) A 3.6 5.1 7.1
Coefficient of performance
(COP) 1 (Total)
Cooling 4.63 3.72 3.55
Heating 4.42 3.91 3.73
Compressor
Model SNB140FRUMT SNB172FEKMT
Output W 950 1,200
Current 1Cooling A2.19 3.69 5.18
Heating 3.16 4.61 5.94
Refrigeration oil (Model) L 0.35 (FV50S) 0.40 (FV50S)
Fan motor
Model RC0J50-CI RC0J60-BC
Current 1Cooling A0.28 0.82
Heating 0.31 0.82
Dimensions W × H × D mm 800 × 550 × 285 840 × 880 × 330
Weight kg 37 55
Special remarks
Dehumidification Cooling L/h 0.6 1.4 2.0
Air flow 1
Cooling Med.
m3/h
1,806 2,748
Low 1,038 1,632
Heating
High 2,016 2,856
Med. 1,710 2,748
Low 1,326 2,274
Sound level
1
Cooling dB(A) 46 47 49
Heating 51
Fan speed
Cooling Med.
rpm
810 780
Low 490 480
Heating
High 900 810
Med. 770 780
Low 610 650
Fan speed regulator 3
Refrigerant filling capacity (R410A) kg 1.10 1.50
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.
SPECIFICATION
3
OBH667B

5
Specifications and rated conditions of main electric parts
Model
Item MUFZ-KJ25VE MUFZ-KJ35VE
Smoothing
capacitor (C61, C62) 600 μF/ 620 μF 420 V
Diode module (DB61) 15 A 600 V
Fuse (F61) T20AL250V
(F701, F801, F901) T3.15AL250V
Power module (IC700) 15 A 600 V
(IC932) 8A600V
Expansion valve
coil (LEV) 12 V DC
Reactor (L61) 23 mH
Power factor
controller (IC820) 20A 600V
Circuit
protection (PTC64, PTC65) 33 Ω
Terminal block (TB) 5 P
Relay
(X63) 3 A 250 V
(X64) 20 A 250 V
(X69) 10A 250V
R.V.coil (21S4) 220 - 240 V AC
Specifications and rated conditions of main electric parts
Model
Item MUZ-KJ50VE
Smoothing
capacitor
(CB1, CB2, CB3) 560 μF 450 V
Fuse
(F601, F880, F901) T3.15AL250 V
IGBT module (IC932) 5 A 600 V
(IC700) 20 A 600 V
Expansion valve
coil (LEV) 12 V DC
Reactor (L) 340 μH
Diode module (IC820) 20 A 600 V
Circuit
protection (PTC64, PTC65) 33 Ω
Terminal block (TB1, TB2) 3 P
Relay
(X64) 20 A 250 V
(X65) 20 A 250 V
(X69) 10 A 250 V
(X601) 3 A 250 V
(X602) 3 A 250 V
R.V. coil (21S4) 220 - 240 V AC
OBH667B

6
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, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING
46
51
NC-10
MUFZ-KJ25VE
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
47
51
NC-10
MUFZ-KJ35VE
NOISE CRITERIA CURVES
4
Test conditions
Cooling: Dry-bulb temperature 35°C
Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C
OUTDOOR UNIT
MICROPHONE
1 m
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, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
NC-10
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING
49
51
MUFZ-KJ50VE
OBH667B

7
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) ø9.52
43
35
2 holes 10 X 21
Drain hole ø42
REQUIRED SPACE
350 mm or more
100 mm or more
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
Unit: mm
MUFZ-KJ25VE
MUFZ-KJ35VE
OUTLINES AND DIMENSIONS
5
MUFZ-KJ50VE
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) Ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) Ø12.7
350 mm or more
100 mm or more
REQUIRED SPACE
100 mm or more
500 mm
or more *2
*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
OBH667B

8
WIRING DIAGRAM
6
MUFZ-KJ25VE
MUFZ-KJ35VE
OBH667B

9
MUFZ-KJ50VE
OBH667B

10
Unit: mm
MUFZ-KJ25VE
MUFZ-KJ35VE
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT61
Discharge
temperature
thermistor
RT62
Flared connection
Stop valve
(with strainar)
Stop valve
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
R.V. coil
heating ON
cooling OFF
Strainer
#100
LEV
Ambient
temperature
thermistor
RT65
Muffler
Capillary tube
ø4.0×ø2.4×240
Outdoor heat
exchanger
temperature
thermistor
RT68
Capillary tube
ø3.0×ø2.0×210
Muffler
REFRIGERANT SYSTEM DIAGRAM
7
MUFZ-KJ50VE
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 Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe
ø 12.7
(with heat insulator)
Refrigerant pipe ø 6.35
(with heat insulator)
LEV
Muffler R.V. coil
heating ON
cooling OFF
Muffler
#100
Strainer
#100
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
OBH667B