Mitsubishi Electric MUFZ-KJ25VEHZ-E1 User manual

SERVICE MANUAL
Models
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
OUTDOOR UNIT
Indoor unit service manual
MFZ-KJ•VE Series (OBH666)
PARTS CATALOG (OBB668)
MUFZ-KJ25VEHZ
MUFZ-KJ35VEHZ
MUFZ-KJ25VEHZ-E1 , E2 , ER1 , ER2 , ET1 , ET2
MUFZ-KJ35VEHZ-E1 , E2 , ER1 , ER2 , ET1 , ET2
MUFZ-KJ50VEHZ-E1 , E2 , ER1 , ER2 , ET1 , ET2
CONTENTS
1. TECHNICAL CHANGES ······························2
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···········12
8. PERFORMANCE CURVES ························14
9. ACTUATOR CONTROL·····························25
10. SERVICE FUNCTIONS······························26
11. TROUBLESHOOTING·······························27
12. DISASSEMBLY INSTRUCTIONS·················50
No. OBH668
REVISED EDITION-E
OBH668 REVISED EDITION-D is void.
Revision F:
• Resistance value of the defrost heater for
MUFZ-KJ25/35VEHZ - E1 , E2 , ER1 ,
ER2 , ET1 , ET2 has been corrected (11-4.).

2
MUFZ-KJ25VEHZ - E1 ,ER1
MUFZ-KJ35VEHZ - E1 ,ER1
MUFZ-KJ50VEHZ - E1 ,ER1
1. New model
MUFZ-KJ25VEHZ - ET1
MUFZ-KJ35VEHZ - ET1
MUFZ-KJ50VEHZ - ET1
1. New model
MUFZ-KJ25VEHZ - E1 MUFZ-KJ25VEHZ - E2
MUFZ-KJ35VEHZ - E1 MUFZ-KJ35VEHZ - E2
MUFZ-KJ50VEHZ - E1 MUFZ-KJ50VEHZ - E2
1. Model name has been changed.
TECHNICAL CHANGES
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.
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-KJ50VEHZ - E1 has been added.
Revision B:
• MUFZ-KJ25VEHZ - ER1 , MUFZ-KJ35VEHZ - ER1 and MUFZ-KJ50VEHZ - ER1 have been added.
Revision C:
• MUFZ-KJ25VEHZ -
ET1
, MUFZ-KJ35VEHZ -
ET1
and MUFZ-KJ50VEHZ -
ET1
have been added.
Revision D:
• MUFZ-KJ25VEHZ - E2 ,ER2 ,ET2 , MUFZ-KJ35VEHZ - E2 ,ER2 ,ET2 and MUFZ-KJ50VEHZ - E2 ,ER2 ,ET2 have been
added.
Revision F:
• Resistance value of the defrost heater for MUFZ-KJ25/35VEHZ - E1 , E2 , ER1 , ER2 , ET1 , ET2 has been corrected (11-4.).
OBH668E

3
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
MUFZ-KJ25VEHZ
MUFZ-KJ35VEHZ
PART NAMES AND FUNCTIONS
2
MUFZ-KJ50VEHZ
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
MUFZ-KJ25VEHZ - ER1 MUFZ-KJ25VEHZ - ER2
MUFZ-KJ35VEHZ - ER1 MUFZ-KJ35VEHZ - ER2
MUFZ-KJ50VEHZ - ER1 MUFZ-KJ50VEHZ - ER2
1. Model name has been changed.
MUFZ-KJ25VEHZ - ET1 MUFZ-KJ25VEHZ - ET2
MUFZ-KJ35VEHZ - ET1 MUFZ-KJ35VEHZ - ET2
MUFZ-KJ50VEHZ - ET1 MUFZ-KJ50VEHZ - ET2
1. Model name has been changed.
OBH668E

4
Outdoor model MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ MUFZ-KJ50VEHZ
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 - 5.1) 4.3 (1.2 - 5.8) 6.0 (2.2 - 8.4)
Breaker Capacity A 10 12 16
Electrical data
Power input 1 (Set) Cooling W540 940 1,410
Heating 770 1,100 1,610
Running current 1
(Set) Cooling A2.7 4.2 6.2
Heating 3.7 5.0 7.1
Power factor 1 (Set) Cooling %87 98
Heating 91 94 98
Starting current 1 (Set) A 3.7 5.0 7.1
Coefficient of performance
(COP) 1 (Set) 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 A2.25 3.75 5.18
Heating 3.17 4.56 5.94
Refrigeration oil (Model) L 0.35 (FV50S) 0.4 (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 1Cooling 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
OBH668E

5
Specifications and rated conditions of main electric parts
Model
Item MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ
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
Defrost heater (H) 230 V 130 W
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
(X66) 3 A 250 V
(X69) 10A 250V
R.V. coil (21S4) 220 - 240 V AC
Heater protector (26H) Open 45°C
Specifications and rated conditions of main electric parts
Model
Item MUFZ-KJ50VEHZ
Smoothing
capacitor
(CB1, CB2, CB3) 560 μF 450 V
Fuse
(F601, F880, F901) T3.15AL250 V
Defrost heater (H) 230 V 120 W
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
Heater protector (26H) Open 45 °C
OBH668E