Mitsubishi MLZ-KA25VA User manual

No. OBH483
REVISED EDITION-D
Models
MLZ-KA25VA - E1 , E2 , E3 , E4
MLZ-KA25VA - ER3 , ER4
MLZ-KA35VA - E1 , E2 , E3 , E4
MLZ-KA35VA - ER3 , ER4
MLZ-KA50VA - E1 , E2 , E3 , E4
MLZ-KA50VA - ER3 , ER4
Please void OBH483 REVISED EDITION-C.
Revision D:
• MLZ-KA25/35/50VA- E4 , ER4 have been
added.
INDOOR UNIT
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
MLZ-KA25VA
MLZ-KA35VA
MLZ-KA50VA
SERVICE MANUAL
Outdoor unit service manual
MXZ-A VA Series (OB377)
MXZ-B VA Series (OBH554)
MXZ-8B VA Series (OCH480)
MXZ-D VA Series (OBH626)
PARTS CATALOG (OBB483)
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 ··············11
8. SERVICE FUNCTIONS ···································12
9. MICROPROCESSOR CONTROL ···················15
10. TROUBLESHOOTING ·····································21
11. DISASSEMBLY INSTRUCTIONS ····················36

2
Revision A :
• MLZ-KA25/35/50VA- E2 have been added.
1TECHNICAL CHANGES
MLZ-KA25VA- E1
MLZ-KA35VA- E1
MLZ-KA50VA- E1
1. New model
MLZ-KA25VA- E1 MLZ-KA25VA- E2
MLZ-KA35VA- E1 MLZ-KA35VA- E2
MLZ-KA50VA- E1 MLZ-KA50VA- E2
1. Fan motor has been changed (RC0J30-KC RC0J30-KK).
2. Control of auto fan speed has been changed. (When indoor units are connected with a multi type outdoor
unit, and operated in heat mode.)
Air flow in auto fan speed is changed depending on air outlet temperature of indoor unit.
3. Electronic control P.C. board has been changed.
MLZ-KA25VA- E2 MLZ-KA25VA- E3
MLZ-KA35VA- E2 MLZ-KA35VA- E3
MLZ-KA50VA- E2 MLZ-KA50VA- E3
1. Software has been changed for ERP.
MLZ-KA25VA- ER3
MLZ-KA35VA- ER3
MLZ-KA50VA- ER3
1. New model
MLZ-KA25VA- E3 MLZ-KA25VA- E4
MLZ-KA35VA- E3 MLZ-KA35VA- E4
MLZ-KA50VA- E3 MLZ-KA50VA- E4
MLZ-KA25VA- ER3 MLZ-KA25VA- ER4
MLZ-KA35VA- ER3 MLZ-KA35VA- ER4
MLZ-KA50VA- ER3 MLZ-KA50VA- ER4
1. Remote controller has been changed.
2. Electronic control P.C. board and display receiver P.C. board have been changed.
3. Vane motor (horizontal) has been changed.
Revision B :
• MLZ-KA25/35/50VA- E3 have been added.
Revision C :
• MLZ-KA25/35/50VA- ER3 have been added.
Revision D :
• MLZ-KA25/35/50VA- E4 , ER4 have been added.
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.
OBH483D

3
2PART NAMES AND FUNCTIONS
ACCESSORIES
Alkaline battery (AAA) for remote controller
Drain hose (with insulation)
Special washer (with cushion, 4pcs)
Installation template
Fixing screw for M5 х 30 mm
Band
Fixing screw for 4 х 16 mm
Remote controller
Remote controller holder
Fixing screw for 3.5 x 16 mm (Black)
MLZ-KA25VA
MLZ-KA35VA
2
1
8
1
4
1
2
1
1
2
MLZ-KA50VA
INDOOR UNIT
MLZ-KA25VA MLZ-KA35VA MLZ-KA50VA
MLZ-KA25/35/50VA- E1 , E2 , E3 , ER3
Vertical vane
Air outlet
Horizontal vane
Air filter
(Catechin air filter, option)
Air cleaning filter
(Anti-Allergy Enzyme
Filter, option)
Safety string
Intake grille
Remote control
receiving section
Display and operation section (When the intake grille is opened)
Operation indicator lamp
Emergency operation switch
Air inlet
Display section
Operation indicator
lamp
Remote control
receiving section
Emergency
operation switch
Horizontal vane
Vertical vane
Air outlet
Air fi lter
(Air purifying
filter, option)
Air inlet
Air cleaning filter
(Silver-ionized air
purifier filter, option)
Intake grille
Safety strings Spec name plate
MLZ-KA25/35/50VA- E4 , ER4
OBH483D

4
SPECIFICATION
3
T3.15AL 250V
12V 300Ω
12V 300Ω
ERZV14D471
230V 6.4W
DC 12V
Item Model
Fuse
Horizontal vane motor
Vertical vane motor
Varistor
DRAIN PUMP
FLOAT SENSOR
MLZ-KA25VA MLZ-KA35VA MLZ-KA50VA
(F11)
(MV1)
(MV2)
(NR11)
(DP)
(FS)
Specifications and rated conditions of main electric parts
Cooling
528/ 480/ 432
35/ 32/ 29
1,120/1,030/950
MLZ-KA35VAMLZ-KA25VA MLZ-KA50VA
Indoor model
Function
Power supply Single phase
230V,50Hz
0.3
40
—
58
0.3
RC0J30-KC
1,102 x 175 x 360
15
5
3
Heating
552/ 492/ 420
36/ 32/ 28
1,160/ 1,060/ 930
Air flow (High/Med./Low)
Running current 1
Power input 1
Auxiliary heater
Power factor 1
Fan motor current 1
Dimensions W x H x D
Weight
Air direction
Sound level (High/Med./Low)
Fan speed (High/Med./Low)
Fan speed regulator
Remote controller model
m
3
/h
A
W
A(kW)
%
A
mm
kg
dB(A)
rpm
Electrical data
Capacity
Fan motor
Special
remarks
Cooling
564/ 504/ 438
37/ 34/ 31
1,180/ 1,080/ 960
Single phase
230V,50Hz
0.3
40
—
58
0.3
RC0J30-KC
1,102 x 175 x 360
15
5
3
Heating
594/ 528/ 462
38/ 35/ 31
1,230/ 1,120/ 1,000
Cooling
684/ 588/ 498
43/ 38/ 34
1,380/1,220/1,070
Single phase
230V,50Hz
0.3
40
—
58
0.3
RC0J30-KC
1,102 x 175 x 360
15
5
3
Heating
708/ 618/ 528
43/ 39/ 34
1,420/ 1,270/ 1,120
Model RC0J30-KK
RC0J30-KT
RC0J30-KK
RC0J30-KT
RC0J30-KK
RC0J30-KT
KM152 (MLZ-KA·VA- , )/KM07E (Other models)
E1 E1 E1
E2
ER3
ER4
E3
E4
E2
ER3
ER4
ER4
E3
E4
E4
E2
ER3
ER4
E3
E4
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
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
Refrigerant piping length (one way): 5m
1 Measured under rated operating frequency.
OBH483D

5
4NOISE CRITERIA CURVES
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling: Dry-bulb temperature 27ºC Wet-bulb temperature 19ºC
COOLING
FUNCTION
43
43
SPL(dB(A)) LINE
High
FAN SPEED
HEATING
Heating: Dry-bulb temperature 20ºC
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
Test conditions,
Cooling: Dry-bulb temperature 27ºC Wet-bulb temperature 19ºC
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
35
36
SPL(dB(A)) LINE
High
FAN SPEED
HEATING
Heating: Dry-bulb temperature 20ºC 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
Test conditions,
Cooling: Dry-bulb temperature 27ºC Wet-bulb temperature 19ºC
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
37
38
SPL(dB(A)) LINE
High
FAN SPEED
HEATING
Heating: Dry-bulb temperature 20ºC
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
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
MLZ-KA25VA MLZ-KA35VA
MLZ-KA50VA
INDOOR UNIT
CEILING
GRILLE
MICROPHONE
1.4m
OBH483D

6
OUTLINES AND DIMENSIONS
5
Unit : mm
INDOOR UNIT
MLZ-KA25VA MLZ-KA35VA MLZ-KA50VA
Center of ceiling opening, suspension bolt pitch
and grille are located in one position.
Air outlet
(Front)
Refrigerant
Pipe
Length of drain hose 480
Drain pipe
NOTE: Drain hose can be used by cutting it.
VP20
Liquid Ø6.35
Ø9.52 (MLZ-KA25/35)
Ø12.7 (MLZ-KA50)
Gas
Ceiling surface Ceiling surface
Drain hose
500mm or less(12)
Hole position for the
installation of grille
Decline 1/100
Drain pipe VP20
How to connect drain pipe on indoor
unit by lifting drain hose.
Drain hose can be used by cutting it.
Suspension bolt M10 Suspension bolt M10
Grille
(Top)
414 Outer side of grille
384 Ceiling opening
308 Suspension bolt pitch
1051 Suspension bolt pitch
Electrical
box
Air outlet
(Top) Wireless
remote controller
(Front) (Right side)
Grille
[MLP-443PW: MLZ-KA·VA- , /MLP-440W: Other models]
Electrical box
Receiving section
E4 ER4
Ceiling
surface
Gas pipe
MLZ-KA25/35: Ø9.52
MLZ-KA50 : Ø12.7
(Flared)
Drain hose
connecting
part (drain pipe
VP20)
Pipe cover
Drain pan
Outlet opening area
Center of ceiling opening, suspension bolt pitch
and grille are located in one position.
Drain hose
connecting part
308
Suspension bolt pitch
Drain hose
Display and
receiving section
No gaps between
the ceiling surface and grille
Liquid pipe
Ø6.35
(Flared)
R6
0.04m2
175
244 170
110
175
180 or more
(31)
60
360
0
110
0
116 175
48
Ø58
1051 Suspension bolt pitch
1160 Ceiling opening
960
1200 Outer side of grille
Outlet
20
54.5
100
20
54.5
100
38
38
15
15
16
(51.6) 180
960 78
1102
CL
1200
1138
414 374
34 15
16
26
26
58
230
2
2
15
58 18
158
13 12
CL
R6
10
0
466.5
466.5
166.5
0
172.4
81.8
173
166.5
112
OBH483D

7
6WIRING DIAGRAM
MLZ-KA25VA- E1
MLZ-KA35VA- E1
INDOOR UNIT
MLZ-KA25VA- E2
MLZ-KA35VA- E2
OBH483D

8
MLZ-KA25VA- E3 , ER3
MLZ-KA35VA- E3 , ER3
MLZ-KA25VA- E4 , ER4
MLZ-KA35VA- E4 , ER4
OBH483D

9
MLZ-KA50VA- E1
MLZ-KA50VA- E2
OBH483D

10
MLZ-KA50VA- E3 , ER3
MLZ-KA50VA- E4 , ER4
OBH483D