Mitsubishi Electric MFZ-KA25VA User manual

CONTENTS
1.TECHNICAL CHANGES ·····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································4
4. NOISE CRITERIA CURVES·······························6
5. OUTLINES AND DIMENSIONS ·························7
6. WIRING DIAGRAM ············································8
7. REFRIGERANT SYSTEM DIAGRAM················8
8. PERFORMANCE CURVES································9
9. SERVICE FUNCTIONS ····································19
10. TROUBLESHOOTING······································21
11. DISASSEMBLY INSTRUCTIONS·····················35
12. PARTS LIST······················································39
13. RoHS PARTS LIST···········································43
14. OPTIONAL PARTS···········································47
MFZ-KA25VA -
MFZ-KA25VA -
MFZ-KA35VA -
MFZ-KA35VA -
MFZ-KA50VA -
MFZ-KA50VA - A2
A1
A2
A1
A2
A1
FLOOR-TYPE, HEAT PUMPAIR CONDITIONERS
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
NOTE:
• This service manual describes technical data of the indoor units.
• RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.
SERVICE MANUAL
Wireless type
Models
No. OB410
REVISED EDITION-A
INDOOR UNIT
Revision A:
●MFZ-KA25VA- , MFZ-KA35VA- and
MFZ-KA50VA- have been added.
●“Failure mode recall function” has been corrected.
●RoHS PARTS LIST has been added.
A2
A2A2
Please void OB410.
Outdoor unit service manual
SUZ-KA•VA Series (OC323)
MXZ-A•VA Series (OB447, OC316)
OB410A--1qxp 06.6.2 4:25 PM Page 1

2
1TECHNICAL CHANGES
2PART NAMES AND FUNCTIONS
INDOOR UNIT
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
Vertical vane
Air outlet
Horizontal vane
Catechin air filter
Display and operation section (When the front grille is opened)
Remote controller
Operation indicator lamp
Emergency operation switch
Air outlet selection switch
Remote control
receiving section
Front grille
Fan guard
Air cleaning filter
(Anti-Allergy Enzyme
Filter, blue bellows type)
Damper
Air outlet
Air inlet
Panel
Vertical vane
MFZ-KA25VA- ➔MFZ-KA25VA-
MFZ-KA35VA- ➔MFZ-KA35VA-
MFZ-KA50VA- ➔MFZ-KA50VA-
1. The operation of thermo-off-unit has been changed. (When 2 or more indoor units are connected with a multi type outdoor
unit, and operated in heat mode.)
< > Indoor fan operates with very Low speed or stops.
< > Indoor fan operates intermittently with very Low speed or stops.
A2
A1
A2A1
A2A1
A2A1
Revision A:
• MFZ-KA25VA- , MFZ-KA35VA- and MFZ-KA50VA- have been added.
• “Failure mode recall function” has been corrected.
• RoHS PARTS LIST has been added.
A2A2A2
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3
ACCESSORIES
REMOTE CONTROLLER
1
2
3
4
5
6
7
8
9
0
1
2
3
Drain hose
Remote controller holder
Fixing screw for 23.5 o1.6 mm (Black)
Pipe cover
Band
Battery (AAA) for remote controller
Indoor unit mounting bracket
Fixing screw for 74 o25 mm
Wood screw for the indoor unit fixation
Washer of 9
Felt tape (Used for left or left-rear piping)
Wireless remote controller
Air cleaning filter
MFZ-KA25VA
MFZ-KA35VA
1
1
2
1
2
2
1
5
4
4
1
1
1
MFZ-KA50VA
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
r
Open the front lid.
ON-TIMER button
CLOCK SET button
TIME SET buttons
FORWARD button
BACKWARD button
OFF-TIMER button
i save button
RESET button VANE CONTROL button
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
Signal transmitting section
Operation display section
Temperature buttons
OPERATE/STOP
(ON/OFF) button
Indication of
remote controller
model is on back
OB410A--1qxp 06.6.2 4:25 PM Page 3

4
3SPECIFICATION
Cooling
522
426/ 348/ 288
1,080
940/ 800/ 700
880
740/ 650/ 550
MFZ-KA35VAMFZ-KA25VA MFZ-KA50VA
Indoor model
Function
Power supply Single phase
230V,50Hz
10
0.2
25
—
54
0.2
RC0J30-GA
RC0J30-HA
700O600O200
14
5
37
32/ 27/ 22
4
10
10
10
10
10
KM05G
Heating
546
456/ 372/ 300
1,010
870/ 740/ 630
1,010
870/ 740/ 630
Air flow(Super High)
Air flow(High/Med./Low)
Power outlet
Running current ✽1
Power input ✽1
Auxiliary heater
Power factor ✽1
Fan motor current ✽1
Model (Upper)
Model (Lower)
Dimensions WOHOD
Weight
Air direction
Sound level(Super High)
Sound level(High/Med./Low)
Fan speed(Super High)
Fan speed(High/Med./Low)
Fan speed(Super High)
Fan speed(High/Med./Low)
Fan speed regulator
Thermistor RT11(at 25:)
Thermistor RT12(at 25:)
Thermistor RT13(at 25:)
Thermistor RT14(at 25:)
Thermistor RT15(at 25:)
Remote controller model
K/h
K/h
A
A
W
A(kW)
%
A
mm
kg
dB(A)
dB(A)
rpm
rpm
rpm
rpm
k"
k"
k"
k"
k"
Electrical data
Capacity
Fan
motor
Special remarks
Cooling
546
444/ 366/ 300
33/ 28/ 23
1,130
970/ 830/ 720
930
770/ 680/ 570
Single phase
230V,50Hz
10
0.2
25
—
54
0.2
RC0J30-GA
RC0J30-HA
700O600O200
14
5
38
4
10
10
10
10
10
KM05G
Heating
570
468/ 372/ 312
38/ 28/ 25
1,030
890/ 740/ 650
1,030
890/ 740/ 650
Cooling
642
552/ 474/ 426
43
1,280
1,140/ 1,020/ 940
1,080
940/ 820/ 740
Single phase
230V,50Hz
10
0.2
25
—
54
0.2
RC0J30-GA
RC0J30-HA
700O600O200
14
5
39/ 35 / 32
4
10
10
10
10
10
KM05G
Heating
708
588/ 528/ 444
44
1,260
1,070/ 930/ 850
1,260
1,070/ 930/ 850
UpperLower
NOTE : Test conditions are based on ISO 5151.
Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19:
Outdoor Dry-bulb temperature 35:Wet-bulb temperature 24:
Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15:
Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
OB410A--1qxp 06.6.2 4:25 PM Page 4

5
T3.15AL 250V
12V 300"
12V 300"
12V 300"
12V 300"
ERZV14D471
Item Model
Fuse
Damper lock motor Right
Damper lock motor Left
Horizontal vane motor
Damper motor
Varistor
MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA
(F11)
(ML1)
(ML2)
(MV1)
(MV2)
(NR11)
Specifications and rating conditions of main electric parts
Function
Power supply
Outdoor model
Capacity Rated frequency(Min.~Max.)
Dehumidification
Air flow(High/Low)
Starting current ✽1
Compressor motor current ✽1
Fan motor current ✽1
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level
✽1
Fan speed(High/Low, High/Med/Low)
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigerating oil (Model)
Thermistor RT61 (at 0:)
Thermistor RT62 (at 100:)
Thermistor RT64 (at 50:)
Thermistor RT65 (at 25:)
Thermistor RT61 (at 25:)
Thermistor RT62 (at 100:)
Thermistor RT64 (at 50:)
Thermistor RT65 (at 25:)
Thermistor RT68 (at 25:)
kW
L/h
K/h
A
A
A
W
"
"
mm
kg
dB
rpm
kg
L
k"
k"
k"
k"
k"
k"
k"
k"
k"
Single phase
230V,50Hz
1.2
4.0
0.33
KNB073FDVH
550
U-V 1.53 U-W 1.53
V-W 1.53
RC0J50-AL
WHT-BLK 37.5
BLK-RED 37.5
RED-WHT 37.5
800o550o285
33
46
0.90
0.32 (NEO22)
32.6
13.4
17
10
—
—
—
—
—
Cooling
2.5 (0.9 - 3.4)
1,890 / 1,746
2.3
4.31
810/750
2
880/810/650
3840/760 2
880/800/630
3
Heating
3.4 (0.9 - 5.1)
2,058 / 1,506
3.5
4.07
SUZ-KA25VA.TH
Indoor model
MFZ-KA25VA Indoor model MFZ-KA35VA
Compressor
Fan motor
Special remarks
Coefficient of performance (C.O.P) ✽1
Capacity
Electrical data
SUZ-KA35VA.TH
Single phase
230V,50Hz
1.7
5.0
0.33
KNB092FCAH
650
U-V 0.49 U-W 0.49
V-W 0.49
RC0J50-AL
WHT-BLK 37.5
BLK-RED 37.5
RED-WHT 37.5
800o550o285
37
1.05
0.32 (NEO22)
32.6
13.4
17
10
—
—
—
—
—
Cooling
3.5 (0.9 - 3.9)
1,896 / 1,668
4.5
3.21
47
Heating
4.0 (0.9 - 6.2)
1,956 / 1,356
4.5
3.64
48
Indoor model
MFZ-KA50VA
SUZ-KA50VA.TH
Single phase
230V,50Hz
2.5
8.5
0.30
SNB130FLDH
850
U-V 0.45 U-W 0.45
V-W 0.45
RC0J60-AA
WHT-BLK 15.2
BLK-RED 15.2
RED-WHT 15.2
840o850o330
53
2
1.60
0.45 (NEO22)
—
—
—
—
10.0
13.4
17.0
10.0
10.0
Cooling
4.8 (0.9 - 5.4)
2,940 / 1,650
6.5
3.10
53
800/480
Heating
6.0(0.9 - 7.9)
2,940 / 2,210
8.0
3.23
55
800/650
NOTE : Test conditions are based on ISO 5151.
Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19:
Outdoor Dry-bulb temperature 35:Wet-bulb temperature 24:
Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15:
Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
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6
4NOISE CRITERIA CURVES
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 20 µPa
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 20 µPaOCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 20 µPa
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
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
43
44
SPL(dB(A)) LINE
Super High
FAN SPEED
HEATING
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:
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
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
37
37
SPL(dB(A)) LINE
Super High
FAN SPEED
HEATING
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:90
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
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION
38
38
SPL(dB(A)) LINE
Super High
FAN SPEED
HEATING
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:
MFZ-KA25VA
INDOOR UNIT
WALL
1m 1m
MICROPHONE
MFZ-KA35VA
MFZ-KA50VA
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7
OUTLINES AND DIMENSIONS
5
Unit : mm
INDOOR UNIT
60
12
19 60
125
147
454155
60
35
45
110
80
60
72
337 337
363
333210 593 7
131131
4-[6 Hole
Indoor unit
Installation plate
96
123
125
6019
12
60
128
118
165
205
20012
12
11
Gas pipe
25, 35:[9.52(flared)3/8
50:[12.7(flared)1/2
Liquid pipe
[6.35(flared)1/4
drain
Air in
Air out
Air out
46.5 46.5
600
700
54 508 137
607
More than 100mm
More than
100mm More than
100mm
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
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8
6WIRING DIAGRAM
REFRIGERANT SYSTEM DIAGRAM
7
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12, RT14,
RT15 (main)
RT13 (sub)
Flared connection
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe [9.52 (MFZ-KA25/35VA)
Refrigerant pipe [12.7 (MFZ-KA50VA)
(with heat insulator)
Refrigerant pipe [6.35
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Distributor
INDOOR UNIT
Unit : mm
INDOOR UNIT MODELS WIRING DIAGRAM
SYMBOL
DB111
F11
LS1
LS2
MF1
MF2
ML1
SYMBOL
ML2
MV1
MV2
NR11
RT11
RT12
RT13
NAME
DIODE STACK
FUSE (T3.15AL250V)
DAMPER LIMIT SWITCH (OPEN)
DAMPER LIMIT SWITCH (CLOSE)
UPPER INDOOR FAN MOTOR
LOWER INDOOR FAN MOTOR
DAMPER LOCK MOTOR (RIGHT)
NAME
DAMPER LOCK MOTOR (LEFT)
HORIZONTAL VANE MOTOR
DAMPER MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR (MAIN 1)
INDOOR COIL THERMISTOR (SUB)
SYMBOL
RT14
TR15
T11
NAME
INDOOR COIL THERMISTOR (MAIN 2)
INDOOR COIL THERMISTOR (MAIN 3)
TRANSFORMER
NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.
2. Use copper conductors only. (For field wiring)
3. Symbols below indicate.
/: Terminal block, : Connector
4
3
2
1
S2
POWER MONITOR
RECEIVER P.C.BOARD
26
230V~
BLU
INDOOR ELECTRONIC
CONTROL P.C. BOARD
SW P.C.
BOARD
INTERLOCK
SWITCH(FAN)
5
MV
TO OUTDOOR
UNIT
CONNECTING
BLK
RED
S3
TB TAB3
DB111
NR11
F11
5
6
4
2
2
LD
105(T)
LD
101(A)
12-24V
RT13
1R1
CN
GRN
LD104
CN201
2
1
151
CN
T111
RED
WHT
111
CN
CN
112
CN211 BLU
YLW
BLK
MF
RT11
RT12
1
3
5
S1
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
GRN
S1
1
2
CN202
12-24V
TB
S3 RED
BLK
TO OUTDOOR
UNIT
CONNECTING
INDOOR ELECTRONIC
CONTROL P.C. BOARD
WHT
230V~
S2 WHT CN201
1
2
LD103
3
3
CN112
CN113
111
RT11
RT15
5
3
1
2
4
6
CN
1
2
3
4
RT12
RT13
RT14
CN
1Y1
CN
1X1
LS1
LS2
CN212
T11
F11
NR11
DB111
ML1
MV1
55
CN
151
MF2
MF1
5
5
ML2
152
MV2
55
CN
106
CN CN
125
62
6
4
2
1
5
3
CN211
6
4
2
1
5
3
DISP REC
P.C.BOARD
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
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9
PERFORMANCE CURVES
8
Wet-and dry-bulb
thermometers
BACK VIEW
OUTDOOR UNIT
FRONT VIEW
Wet and dry-bulb
thermometers
Indoor air Wet-bulb temperature
difference (:)
Indoor intake air Wet-bulb temperature (:)
Outdoor intake air Dry-bulb temperature (:)
Indoor intake air Wet-bulb temperature (:)
Outdoor intake air Dry-bulb temperature (:)
SUZ-KA25VA.TH
7.4
6.8
6.2
5.6
5.0
4.5
10.4
9.5
8.6
7.8
7.0
6.2
Rated frequency 57Hz
SUZ-KA35VA.TH
Rated frequency 77Hz
12.5
11.4
10.4
9.3
8.3
7.4
SUZ-KA50VA.TH
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50
VA
Rated frequency 75Hz
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
INDOOR UNIT
The standard data contained in these specifications apply only to the operation of the air conditioner under normal condition.
Operating conditions vary according to the areas where these units are installed. The following information has been provided
to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
COOLING
(1) Indoor intake air wet-bulb temperature : ˚C [WB]
(2) Indoor outlet air wet-bulb temperature : ˚C [WB]
(3) Outdoor intake air dry-bulb temperature : ˚C [DB]
(4) Total input : W
Indoor air wet/dry-bulb temperature difference on the side of the following chart shows the difference between the indoor
intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.
How to measure the indoor air wet-bulb/dry-bulb temperature difference
1. Attach at least 2 sets of wet-and-dry-bulb thermometers to the indoor air inlet as shown in the figure, and at least 2 sets of
wet-and-dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed
is high.
2. Attach at least 2 sets of wet-and-dry-bulb thermometers to the outdoor air inlet.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of the room.
5. Press the EMERGENCY OPERATION switch once to start the COOL(HEAT) MODE.
6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
7. 10 minutes later, measure temperature again and check that the temperature does not change.
HEATING
(1) Indoor intake air dry-bulb temperature : ˚C [DB]
(2) Indoor outlet air dry-bulb temperature : ˚C [DB]
(3) Outdoor intake air wet-bulb temperature : ˚C [WB]
(4) Total input : W
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10
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
24.4
22.6
20.7
18.8
16.9
15.0
13.2
11.3
27.5
25.4
23.3
21.2
19.1
16.9
14.8
12.7
Indoor air Dry-bulb temperature
difference (:)
Indoor intake air Dry-bulb temperature (:)
Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:)
Indoor intake air Dry-bulb temperature (:)
SUZ-KA25VA.TH
Rated frequency 80Hz
SUZ-KA35VA.TH
Rated frequency 74Hz
33.0
30.4
27.9
25.4
22.8
20.3
17.8
15.2
SUZ-KA50VA.TH
MFZ-KA25VA
MFZ-KA35VA
MFZ-KA50VA
Rated frequency 79Hz
NOTE:The above curves are for the heating operation without any frost.
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Correction of Cooling total input
Input correction factors
The operational frequency of compressor
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
Correction of Heating total input
Input correction factors
The operational frequency of compressor
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Input correction factors
The operational frequency of compressor
Correction of Cooling total input
Input correction factors
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
Input correction factors
The operational frequency of compressor
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
2.0
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
2.0
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
2.0
2.5
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
2.0
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
2.0
2.5
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
2.0
Input correction factors
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
2.0
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
2.0
2.5
0 50 100 150(Hz)
0.0
0.5
1.0
1.5
2.0
SUZ-KA25VA.TH
SUZ-KA35VA.TH SUZ-KA35VA.TH SUZ-KA35VA.TH SUZ-KA35VA.TH
SUZ-KA25VA.TH SUZ-KA25VA.TH SUZ-KA25VA.TH
SUZ-KA50VA.TH SUZ-KA50VA.TH SUZ-KA50VA.TH SUZ-KA50VA.TH
<How to operate fixed-frequency operation (Test run operation)>
1. Press the EMERGENCY OPERATION switch or the Test button to COOL or HEAT mode.
2. Test run operation starts and continue to operate for 30 minutes.
3. Compressor starts at rated frequency in COOL mode or 58Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts.
6. To cancel test run operation (EMERGENCY OPERATION), press the EMERGENCY OPERATION switch or the ON/OFF
button on remote controller.
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