SPLIT-TYPE, HEAT PUMP AIR CONDITIONER
Revision:
E2
• MXZ-24UV -
has been added.
• Please void OB287.
No. OB287
REVISED EDITION-A
SERVICE MANUAL
Inverter-controlled multi system
Model
E1
MXZ-24UV -
MXZ-24UV -
E2
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························4
4. INDOOR UNITS COMBINATION ·······················5
5. SPECIFICATION·················································7
6. NOISE CRITERIA CURVES······························ 8
7. OUTLINES AND DIMENSIONS ························ 9
8. WIRING DIAGRAM ··········································10
9. REFRIGERANT SYSTEM DIAGRAM ··············11
10. PERFORMANCE CURVES ······························12
11. MICROPROCESSOR CONTROL·····················18
12. TROUBLESHOOTING······································24
13. DISASSEMBLY INSTRUCTIONS·····················36
14. PARTS LIST······················································39
15. OPTIONAL PARTS···········································42
Model indication
This manual describes technical data of the outdoor unit.
For the indoor unit refer to the service manuals No. OB229, OB227 REVISED EDITION-B, OB252, OB212,
OB239 and OC165 of corresponding models.
2
PART NAMES AND FUNCTIONS
OUTDOOR UNIT
(back and side)
Air inlet
E1
MXZ-24UV-
E2
MXZ-24UV-
Model indication
Air outlet
3
3
INDOOR / OUTDOOR CORRESPONDENCE TABLE
NOTE: SLH-1AR is equivalent to class 09 (9000BTU).
MCFH-13NV, SEH-1.6AR, SLH-1.6AR is equivalent to class 12 (12000BTU).
MCFH-18NV, SEH-2AR,SLH-2AR is equivalent to class 18 (18000BTU).
OUTDOOR UNIT
MXZ-24UV- E1 , MXZ-24UV- E2
07+07
07+09
07+12
07+18
09+09
09+12
09+18
12+12
12+18
18+18
07+07+07
07+07+09
07+07+12
07+07+18
07+09+09
07+09+12
07+09+18
09+09+09
09+09+12
❈There is no combination other than this table.
4
4
INDOOR UNITS COMBINATION
E1 , MXZ-24UV - E2
MXZ-24UV -
NOTE: Electrical data is for outdoor unit only.
Cooling capacity (kW)
Outdoor unit
power consumption
(W)
Power
factor
(%)
Indoor units
combination
Current
(A)
Total
Unit A
2.2
Unit B
—
Unit C
—
2.2
750
07
3.62
4.35
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
(0.9-2.7)
(260-930)
2.8
900
09
2.8
—
—
(0.9-3.2)
(260-1040)
4.0
1440
12
4.0
—
—
6.96
(0.9-4.5)
(260-1700)
5.0
2300
18
5.0
—
—
11.11
7.44
(0.9-5.4)
(260-2980)
4.4
1540
07+07
2.2
2.2
—
(1.8-5.4)
(580-1960)
5.0
1620
07+09
2.2
2.8
—
7.83
(1.8-5.8)
(580-2050)
6.2
2280
07+12
2.2
4.0
—
11.01
14.40
9.18
(1.8-6.7)
(580-2540)
7.1
2980
07+18
2.15
2.8
4.95
2.8
—
(1.8-7.6)
(580-3450)
5.6
1900
09+09
—
(1.8-6.2)
(580-2180)
6.8
2730
09+12
2.8
4.0
—
13.19
14.40
14.40
14.40
14.40
8.94
(1.8-7.4)
(580-3230)
7.1
2980
09+18
2.55
3.55
3.15
3.55
2.2
4.55
3.55
3.95
3.55
2.2
—
(1.8-7.6)
(580-3450)
7.1
2980
12+12
—
(1.8-7.6)
(580-3450)
7.1
2980
12+18
—
(1.8-7.6)
(580-3450)
7.1
2980
18+18
—
(1.8-7.6)
(580-3450)
6.6
1850
07+07+07
07+07+09
07+07+12
07+07+18
07+09+09
07+09+12
07+09+18
09+09+09
09+09+12
2.2
2.8
3.4
3.8
2.55
3.15
3.55
2.37
3.0
(2.4-8.1)
(700-3650)
7.1
2080
2.15
1.85
1.65
2.0
2.15
1.85
1.65
2.55
2.2
10.05
10.05
10.05
10.05
10.05
10.05
10.05
10.05
(2.4-8.5)
(700-4070)
7.1
2080
(2.4-8.5)
(700-4070)
7.1
2080
(2.4-8.5)
(700-4070)
7.1
2080
(2.4-8.5)
(700-4070)
7.1
2080
1.75
1.55
2.37
2.05
(2.4-8.5)
(700-4070)
7.1
2080
2.0
(2.4-8.5)
(700-4070)
7.1
2080
2.37
2.05
(2.4-8.5)
(700-4070)
7.1
2080
(2.4-8.5)
(700-4070)
NOTE: SLH-1AR is equivalent to class 09 (9000BTU).
MCFH-13NV, SEH-1.6AR, SLH-1.6AR is equivalent to class 12 (12000BTU).
MCFH-18NV, SEH-2AR,SLH-2AR is equivalent to class 18 (18000BTU).
5
NOTE: Electrical data is for outdoor unit only.
Heating capacity (kW)
Outdoor unit
power consumption
(W)
Power
factor
(%)
Indoor units
combination
Current
(A)
Total
Unit A
3.2
Unit B
Unit C
—
3.2
1130
07
—
—
5.46
6.38
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
(0.9-4.1)
(270-1600)
4.0
1320
09
4.0
—
(0.9-4.8)
(270-1700)
6.0
1900
12
6.0
—
—
9.23
(0.9-7.2)
(270-2570)
7.1
2300
18
7.1
—
—
11.11
9.32
(0.9-7.8)
(270-2830)
6.4
1930
07+07
3.2
3.2
4.0
5.4
6.2
4.0
5.3
5.75
4.5
4.9
4.5
2.87
2.75
2.3
2.15
3.2
2.7
2.5
3.0
2.55
—
(1.8-7.2)
(470-2300)
7.2
2050
07+09
3.2
—
9.90
(1.8-8.7)
(470-2680)
8.6
2550
07+12
3.2
—
12.32
13.19
11.35
12.75
13.19
13.19
13.19
13.19
11.69
12.08
12.08
12.08
12.08
12.08
12.08
12.08
12.08
(1.8-10.6)
(470-3800)
9.0
2730
07+18
2.8
—
(1.8-10.9)
(470-3880)
8.0
2350
09+09
4.0
—
(1.8-10.1)
(470-3560)
8.8
2640
09+12
3.5
—
(1.8-10.8)
(470-3850)
9.0
2730
09+18
3.25
4.5
—
(1.8-10.9)
(470-3880)
9.0
2730
12+12
—
(1.8-10.9)
(470-3880)
9.0
2730
12+18
4.1
—
(1.8-10.9)
(470-3880)
9.0
2730
18+18
4.5
—
(1.8-10.9)
(470-3880)
8.6
2420
07+07+07
07+07+09
07+07+12
07+07+18
07+09+09
07+09+12
07+09+18
09+09+09
09+09+12
2.87
2.75
2.3
2.87
3.5
4.4
4.7
3.2
4.1
4.5
3.0
3.9
(2.1-10.6)
(520-3000)
9.0
2500
(2.1-10.9)
(520-3180)
9.0
2500
(2.1-10.9)
(520-3180)
9.0
2500
2.15
2.6
(2.1-10.9)
(520-3180)
9.0
2500
(2.1-10.9)
(520-3180)
9.0
2500
2.2
(2.1-10.9)
(520-3180)
9.0
2500
2.0
(2.1-10.9)
(520-3180)
9.0
2500
3.0
(2.1-10.9)
(520-3180)
9.0
2500
2.55
(2.1-10.9)
(520-3180)
NOTE: SLH-1AR is equivalent to class 09 (9000BTU).
MCFH-13NV, SEH-1.6AR, SLH-1.6AR is equivalent to class 12 (12000BTU).
MCFH-18NV, SEH-2AR,SLH-2AR is equivalent to class 18 (18000BTU).
6
5
SPECIFICATION
E1
E2
Outdoor model
MXZ-24UV -
, MXZ-24UV -
Single phase
230V,50Hz
2 to 3
Outdoor unit power supply
Indoor units number
Indoor units total capacity (Connectable)
Indoor units total capacity (Simultaneous operation)
Piping total length
✽2 Total model name 34 (3 indoor units) / 36 (2 indoor units)
✽2 Total model name 34 (3 indoor units) / 36 (2 indoor units)
Max. 50
Max. 25
10
Connecting pipe length
Height difference (Indoor ~ Outdoor)
Height difference (Indoor ~ Indoor)
Function
10
Cooling
7.1 (0.9~8.5)
—
Heating
9.0 (0.9~10.9)
—
kW
R/h
K /h
A
Capacity
Dehumidification
Outdoor air flow
Power outlet
2520
25
10.05
12.08
A
Running current
Power input
2080 (260~4070)
2500 (270~3180)
W
A(kW)
W
Auxiliary heater
—
—
Crankcase heater
Power factor
%
90.0
A
Starting current
12.08
8.7
9.1
A
Compressor motor current
Fan motor current
Coefficient of performance(C.O.P)
A
0.6
2.68
3.35
Model
THV247FBA (ROTARY)
2000
W
Output
Winding
U-V 0.61
"
resistance(at20:)
Model
V-W 0.61 W-U 0.61
RA6V60-BA
Winding
WHT-BLK 78.7 BLK-YLW 26.9
YLW-BLU 11.7 BLU-RED 83.6
900o900o320 (+35)
78
"
resistance(at20:)
Dimensions WOHOD
Weight
mm
kg
46
47
dB
Sound level (High)
Fan speed (High)
Fan speed regulator
Refrigerant filling
capacity(R22)
rpm
550
3
kg
3.9
cc
k"
k"
k"
k"
k"
k"
Refrigerating oil (Model)
Thermistor RT61
Thermistor RT62
Thermistor RT63
Thermistor RT65
Thermistor RT66,67
Thermistor RT68
870 (MS-56)
13.4 (at 100:)
10.0 (at 25:)
10.0 (at 25:)
17.0 (at 50:)
10.0 (at 25:)
10.0 (at 25:)
NOTE: Test conditions are based on ISO5151 (Refrigerant piping length (one way): 5m)
✽1 Electrical data is for only outdoor unit.
✽2 However, please refer to “INDOOR/OUTDOOR CORRESPONDENCE TABLE” of page 3 for the combination.
TEST CONDITIONS COOLING INDOOR DB27.0°C WB19.0°C
OUTDOOR DB35.0°C WB24.0°C
HEATING INDOOR DB20.0°C
OUTDOOR DB 7.0°C WB 6.0°C
7
6
NOISE CRITERIA CURVES
SPL(dB(A))
LINE
NOTCH
COOL
HEAT
46
47
Test conditions.
Cooling :DB35:
Heating :DB 7:
E1
MXZ-24UV -
MXZ-24UV -
WB24:
WB 6:
E2
90
80
70
60
50
40
30
NC-70
NC-60
NC-50
NC-40
NC-30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
63
125
250
500
1000
2000
4000
8000
BAND CENTER FREQUENCIES, Hz
8
7
OUTLINES AND DIMENSIONS
Unit: mm
OUTDOOR UNIT
E1
MXZ-24UV -
E2
MXZ-24UV -
2-U-shape notched holes
(Base bolt M10)
200
500
200
Rubber cushion
Air in
Veranda
Base
Air in
Air out
2-12 ✕36 Oval hole
(Base bolt M10)
[ 9.52 (flared) 3/8 (C unit)
10
320
35
900
12.7 (flared) 1/2 (A , B unit)
[
Indoor and
outdoor
Handle for
moving
Air in
88
connect wiring
23✕45 hole
Air in
C unit connection
B unit connection
A unit connection
23
Liquid pipe
317
[
6.35 (flared) 1/4
1.Installation space
More than
100
Note : Leave front and both sides
clearance fully.
Note : Obsacle on front and rear sid only.
The unit can be used by attaching an optional
outdoor outlet guide (MAC-855SG)
(but both sides and the top are opend.)
2.Service space
Note : Leave front and overhead
clearance fully.
More than
100
More than
350
More than
100
More than
350
More than
350
Note : Leave front, overhead and
both clearance fully.
Service space
9
8
WIRING DIAGRAM
OUTDOOR UNIT
E1
MODELS MXZ-24UV-
BRN
GRY
DS62
A
DS61
+
C61
+
C63
+
C62
+
L
RED
ORN
RED
YLW
BLK
BLK
RED
ORN
WHT
K
YLW
WHT
BLK
-
–
–
–
YLW
R
RED BLK
TB5
CT
61
NOISE FILTER
P.C.BOARD
4
6
BLK
X64
GRN/YLW
POWER SUPPLY
~/N 230V
50Hz
63H2
V
X64
TB1
PE
BLK
BLU
0
1
MC
ORN
ORN
L61
L
LD62
LD61
U
W
2
N
F911
RELAY
P.C. BOARD
CIRCUIT BRAKER
LDE
TAB64
TAB65
T801
(1A)
C65
1
2
CN913
CN720
TB2
CN901
CN902
4
1
2
3
4
INDOOR
UNIT (A)
INDOOR
UNIT (B)
INDOOR
UNIT (C)
N
BLU
RED
CT62
TAB66
GRN
1
2
3
4 5
6
TB3
N
3
3
3
BLU
ORN
6
TB4
N
21S4
BLU
YLW
I.P.M P.C. BOARD
MF61
CN851
CN852
ELECTRONIC CONTROL P.C. BOARD
CN791
4 5
CN792
4 5
CN793
4 5
CN722 CN663
CN662
4 5
CN661
4 5
1
2
3
6
1
2
3
6
1
2
3
6
1
2
3
4
1
2
1
2
3
6
7
8
1
2
3
6
7
8
63H1
RT65 RT66
RT68
RT62
RT63
RT67
RT61
LEV A
LEV B
LEV C
SYMBOL
NAME
SYMBOL
LEV A~C
MC
MF61
R
RT61
RT62
RT63
RT65
RT66,67
RT68
NAME
EXPANSION VALVE
COMPRESSOR
SYMBOL
SSR61
T801
NAME
SOLENOID COIL RELAY
TRANSFORMER
C61
C62,63
C65
CT61,62
DS61
DS62
F801
F911
L
POWER FACTOR CAPACITOR
SMOOTHING CAPACITOR
OUTDOOR FAN CAPACITOR
CURRENT TRANSFORMER
DIODE MODULE
FAN MOTOR (INNER PROTECTOR) TB1,2,3,4,5 TERMINAL BLOCK
RESISTOR
X61,62,63 FAN MOTOR RELAY
DISCHARGE TEMPERATURE THERMISTOR
DEFROST TEMPERATURE THERMISTOR
EVAPORATION TEMPERATURE THERMISTOR
FIN TEMPERATURE THERMISTOR
GUS PIPE TEMPERATURE THERMISTOR
GUS PIPE TEMPERATURE THERMISTOR
X64,65
X66,67
21S4
63H1
63H2
RELAY
RELAY
R.V. COIL
DIODE STACK
FUSE (1A)
FUSE (1A)
REACTOR
HIGH PRESSURE SWITCH
HIGH PRESSURE SWITCH
L61
COMMON MODE CHOKE COIL
SG79A845H01
NOTE: 1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.
2.Use copper conductors only. (For field wiring)
3.Symboles below indicate. : Terminal block
: Connector
E2
MODELS MXZ-24UV-
BRN
GRY
DS62
DS61
+
C61
+
C63
+
C62
+
L
RED
ORN
RED
YLW
A
BLK
BLK
RED
ORN
WHT
K
YLW
WHT
-
–
–
–
BLK
YLW
R
RED BLK
CT
61
NOISE FILTER
P.C.BOARD
4
6
BLK
X64
GRN/YLW
POWER SUPPLY
~/N 230V
50Hz
63H2
V
X64
TB1
PE
BLK
BLU
0
1
MC
ORN
ORN
L61
L
LD62
LD61
U
W
2
N
F911
RELAY
P.C. BOARD
CIRCUIT BRAKER
LDE
TAB64
T801
(1A)
C65
1
2
CN913
CN720
TB2
TAB65
CN901
6
CN902
4
1
2
3
4
INDOOR
UNIT (A)
INDOOR
UNIT (B)
INDOOR
UNIT (C)
N
BLU
RED
CT62
TAB66
GRN
1
2
3
4 5
6
TB3
N
3
3
3
BLU
ORN
TB4
N
21S4
BLU
YLW
I.P.M P.C. BOARD
MF61
CN851
CN852
ELECTRONIC CONTROL P.C. BOARD
CN791
4 5
CN792
4 5
CN793
4 5
CN722 CN663
CN662
4 5
CN661
4 5
1
2
3
6
1
2
3
6
1
2
3
6
1
2
3
4
1
2
1
2
3
6
7
8
1
2
3
6
7
8
63H1
RT65 RT66
RT68
RT62
RT63
RT67
RT61
LEV A
LEV B
LEV C
SYMBOL
NAME
SYMBOL
MC
MF61
R
RT61
RT62
RT63
RT65
RT66,67
RT68
SSR61
T801
NAME
COMPRESSOR
FAN MOTOR (INNER PROTECTOR)
RESISTOR
DISCHARGE TEMPERATURE THERMISTOR
DEFROST TEMPERATURE THERMISTOR
EVAPORATION TEMPERATURE THERMISTOR
FIN TEMPERATURE THERMISTOR
GUS PIPE TEMPERATURE THERMISTOR
GUS PIPE TEMPERATURE THERMISTOR
SOLENOID COIL RELAY
SYMBOL
TB1,2,3,4,5 TERMINAL BLOCK
X61,62,63 FAN MOTOR RELAY
X64,65
X66,67
21S4
63H1
63H2
F912
NAME
C61
C62,63
C65
CT61,62
DS61
DS62
F801
F911
L
L61
LEV A~C
POWER FACTOR CAPACITOR
SMOOTHING CAPACITOR
OUTDOOR FAN CAPACITOR
CURRENT TRANSFORMER
DIODE MODULE
RELAY
RELAY
R.V. COIL
DIODE STACK
HIGH PRESSURE SWITCH
HIGH PRESSURE SWITCH
FUSE (3.15A)
FUSE (1A)
FUSE (1A)
REACTOR
NR63
VARISTOR
COMMON MODE CHOKE COIL
EXPANSION VALVE
TRANSFORMER
NOTE: 1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.
2.Use copper conductors only. (For field wiring)
SG79Y088H01
3.Symboles below indicate. : Terminal block
: Connector
10
9
REFRIGERANT SYSTEM DIAGRAM
E1
MXZ-24UV -
Unit:mm
E2
MXZ-24UV -
Indoor
units
a
b
Outdoor
unit
H
H
Piping length each indoor unit (a, b, c)
Total piping length (a+b+c)
25m
50m
10m
25
H
Height difference between units (H)
Bending point for each unit
Total bending point
50
c
❋It does not matter which unit is higher.
● Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes,refer to the
tables below.
● When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe,see page BACK COVER.
Unit : mm (inch)
Indoor unit
Pipe diameter
Outdoor unit union diameter
Extension pipe diameter
class
07/09
For
Liquid
Gas
6.35(1/4)
9.52(3/8)
6.35(1/4)
12.7(1/2)
6.35(1/4)
15.88(5/8)
Liquid
6.35(1/4)
9.52(3/8)
6.35(1/4)
12.7(1/2)
6.35(1/4)
15.88(5/8)
Liquid
Gas
6.35(1/4)
12.7(1/2)
6.35(1/4)
12.7(1/2)
6.35(1/4)
9.52(3/8)
Indoor unit A
Gas
Liquid
Gas
Liquid
Gas
Liquid
Gas
12
18
Indoor unit B
Indoor unit C
Liquid
Gas
Liquid
Gas
Liquid
Gas
11
PERFORMANCE CURVES
10
The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions,
since operating conditions vary according to the areas where these units are installed. The following information has been pro-
vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
198 ~ 264V
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature :
(2) Indoor outlet air wet-bulb temperature :
(3) Outdoor intake air dry-bulb temperature :
(4) Total input:
(5) Indoor intake air dry-bulb temperature :
(6) Outdoor intake air wet-bulb temperature :
(7) Total input :
Indoor air wet/dry-bulb temperature difference on the left side of the chart on page 14 and 15 shows the difference
between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your refer-
ence at service.
°CWB
°CWB
°CDB
W
°CDB
°CWB
W
Cooling
Heating
}
}
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 intake 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 intake.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of room.
5. Press the EMERGENCY OPERATION switch once(twice) to start the EMERGENCY 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.
INDOOR UNIT
OUTDOOR UNIT
Wet-and dry-bulb
thermometers
Wet-and dry-bulb
thermometers
10-1.CAPACITY AND THE INPUT CURVES
8.7
8.1
7.4
6.8
6.2
5.6
10.8
10.1
9.3
6.7
6.2
5.8
5.3
4.8
4.3
7.5
7.0
6.4
5.9
5.3
4.8
8.5
7.7
7.0
25.9
23.9
27.7 32.3
25.6 29.8
38.2
35.3
21.9
19.9
17.9
23.4 27.3
21.3 24.9
19.2 22.4
32.4
29.4
26.5
15.9
13.9
11.9
17.0 19.9
14.9 17.4
12.8 14.9
23.5
20.6
17.6
12
10-2.Capacity and input correction by inverter output frequency
(OUTDOOR UNIT:MXZ-24UV)
NOTE 1 : The dotted line on graphs connects the frequency range in normal operation shown by the full line and the frequency
in test run shown by the point.
1. 07-class unit in single operation
<COOL>Capacity
<COOL>Total input
<HEAT>Capacity
<HEAT>Total input
2.0
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
Hz
Hz
Hz
Hz
Hz
0
0
0
0
50
100
150
150
150
150
0
50
100
150
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
150 Hz
150 Hz
150 Hz
Frequency
Frequency
2. 09-class unit in single operation
<COOL>Total input
<HEAT>Capacity
<COOL>Capacity
<HEAT>Total input
2.0
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
Hz
0
0
0
50
100
Frequency
150
Hz
0
50
100
150
50
100
0
50
100
Frequency
Frequency
Frequency
3. 12-class unit in single operation
<COOL>Capacity
<COOL>Total input
<HEAT>Capacity
<HEAT>Total input
1.5
1.0
0.5
2.0
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
Hz
0
50
100
150
50
100
Frequency
150
50
100
0
50
100
Frequency
Hz
Frequency
Frequency
4. 18-class unit in single operation
<COOL>Total input
<HEAT>Capacity
<COOL>Capacity
<HEAT>Total input
2.0
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
Hz
0
50
100
150
50
100
150 Hz
50
100
0
50
100
Frequency
Frequency
Frequency
Frequency
13
10-3.Outdoor low pressure and outdoor unit current
1. 07-class unit in single operation
NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The converted score against the traditional unit system can be gotten according to the formula below.
1(MPa • G) =10.2(kgf/f• G)
(1) COOL operation
1Both indoor and outdoor units are under the same
temperature/humidity condition.
<How to work fixed-frequency operation>
1.Set emergency switch to COOL or HEAT.The switch is locat-
ed on indoor unit.
Dry-bulb temperature(°C) Relative humidity(%)
2.Press emergency run ON/OFF button.
20
25
30
50
60
70
3.Compressor starts running at rated frequency.
4.Indoor fan runs at HI speed and continues for 30 minutes.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
2Air flow speed : HI
3Inverter output frequency : 33Hz
(kgf/F•Gauge)
(MPa•Gauge)
0.8
9
8
7
6
8
0.7
0.6
0.5
0.4
0.3
7
6
33Hz
5
4
33Hz
5
3
2
4
3
0.2
15
20
(;)
(%)
(;)
(%)
35
15 20
25
30 35
30
25
Ambient temperature(:)/ Ambient humidity(%)
Ambient temperature(:)/ Ambient humidity(%)
(2) HEAT operation
①
Indoor
Outdoor
DB(°C) 20.0
WB(°C) 14.5
DB(°C)
WB(°C)
2
1
7
6
15 20.0
12 14.5
➁
➂
Set air flow to Hi speed.
Inverter output frequency is 45Hz.
10
9
8
7
6
5
4
45Hz
0
5
10
15
20
25
Ambient temperature(:)
14
2. 09-class unit in single operation
NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The converted score against the traditional unit system can be gotten according to the formula below.
1(MPa • G) =10.2(kgf/f• G)
(1) COOL operation
1Both indoor and outdoor units are under the same
temperature/humidity condition.
<How to work fixed-frequency operation>
1.Set emergency switch to COOL or HEAT.The switch is locat-
ed on indoor unit.
Dry-bulb temperature(°C) Relative humidity(%)
20
25
30
50
60
70
2.Press emergency run ON/OFF button.
3.Compressor starts running at rated frequency.
4.Indoor fan runs at HI speed and continues for 30 minutes.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
2Air flow speed : HI
3Inverter output frequency : 33Hz
(kgf/F•Gauge)
(MPa•Gauge)
0.8
9
8
7
6
8
0.7
0.6
0.5
0.4
0.3
7
6
33Hz
5
4
33Hz
5
3
2
4
3
0.2
15
20
(;)
(%)
(;)
(%)
35
15 20
25
30 35
30
25
Ambient temperature(:)/ Ambient humidity(%)
Ambient temperature(:)/ Ambient humidity(%)
(2) HEAT operation
①
Indoor
Outdoor
DB(°C) 20.0
WB(°C) 14.5
DB(°C)
WB(°C)
2
1
7
6
15 20.0
12 14.5
➁
➂
Set air flow to Hi speed.
Inverter output frequency is 45Hz.
10
9
45Hz
8
7
6
5
4
0
5
10
15
20
25
Ambient temperature(:)
15
3. 12-class unit in single operation
NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The converted score against the traditional unit system can be gotten according to the formula below.
1(MPa • G) =10.2(kgf/f• G)
(1) COOL operation
1Both indoor and outdoor units are under the same
temperature/humidity condition.
<How to work fixed-frequency operation>
1.Set emergency switch to COOL or HEAT.The switch is locat-
ed on indoor unit.
Dry-bulb temperature(°C) Relative humidity(%)
20
25
30
50
60
70
2.Press emergency run ON/OFF button.
3.Compressor starts running at rated frequency.
4.Indoor fan runs at HI speed and continues for 30 minutes.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
2Air flow speed : HI
3Inverter output frequency : 33Hz
(kgf/F•Gauge)
(MPa•Gauge)
9
8
7
6
0.8
8
0.7
0.6
0.5
0.4
0.3
7
6
33Hz
5
4
5
33Hz
4
3
3
2
0.2
15
20
(;)
(%)
(;)
(%)
15 20
25
30 35
35
30
25
Ambient temperature(:)/ Ambient humidity(%)
Ambient temperature(:)/ Ambient humidity(%)
(2) HEAT operation
①
Indoor
Outdoor
DB(°C) 20.0
WB(°C) 14.5
DB(°C)
WB(°C)
2
1
7
6
15 20.0
12 14.5
➁
➂
Set air flow to Hi speed.
Inverter output frequency is 45Hz.
10
9
8
7
6
5
4
45Hz
0
5
10
15
20
25
Ambient temperature(:)
16
4. 18-class unit in single operation
NOTE:The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The converted score against the traditional unit system can be gotten according to the formula below.
1(MPa • G) =10.2(kgf/f• G)
(1) COOL operation
①
Both indoor and outdoor units are under the same
temperature/humidity condition.
<How to work fixed-frequency operation>
1.Set emergency switch to COOL or HEAT.The switch is locat-
ed on indoor unit.
2.Press emergency run ON/OFF button.
3.Compressor starts running at rated frequency.
4.Indoor fan runs at HI speed.
Dry-bulb temperature(°C) Relative humidity(%)
20
25
30
50
60
70
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
➁
➂
Air flow speed : HI
Inverter output frequency : 33Hz
(kgf/F•Gauge)
(MPa•Gauge)
0.8
9
8
7
6
8
0.7
0.6
0.5
0.4
0.3
7
6
33Hz
5
4
33Hz
5
4
3
3
2
0.2
15
(;)
(%)
(;)
(%)
15 20
25
30 35
35
30
20
25
Ambient temperature(:)/ Ambient humidity(%)
Ambient temperature(:)/ Ambient humidity(%)
(2) HEAT operation
①
Indoor
Outdoor
DB(°C) 20.0
WB(°C) 14.5
DB(°C)
WB(°C)
2
1
7
6
15 20.0
12 14.5
➁
➂
Set air flow to Hi speed.
Inverter output frequency is 45Hz.
10
9
8
7
6
5
4
45Hz
0
5
10
15
20
25
Ambient temperature(:)
17
11
MICROPROCESSOR CONTROL
INVERTER MULTI SYSTEM CONTROL
E1
MXZ-24UV -
E2
MXZ-24UV -
Output signal
Input signal
Compressor
power
factor
Compressor
primary
current
Compressor
secondary
current
Indoor unit
microprocessor
Outdoor unit control microprocessor
Drive
circuit
SSR61
Transistor
module
Fin temperature
thermistor RT65
Accumulator
Comp.
H.P.S 63H2
H.P.S 63H1
Discharge
x 61
x 62
x 63
temperature
thermistor
RT61
R. V. coil
21S4
Indoor Unit
C
Indoor Unit
Muffler
B
Indoor Unit
A
Gas pipe
temperature
thermistor
Evaporation
temperature
thermistor
RT63
RT66, 67, 68
Outdoor
fan motor
MF61
Defrost
thermistor
RT62
Indoor Unit
A
LEV1
LEV2
LEV3
Indoor Unit
B
Indoor Unit
C
18
11-1.LEV control
Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit.
Determination of LEV standard opening in each indoor unit
• The standard opening is on the straight line, which connects an each standard point in the section where divided
into seven according to the operation frequency of compressor as shown in the figure below.
(LEV opening is controlled in proportion to the operation frequency.)
Note: Opening is adjusted at the standard opening according to the indoor unit conditions.
However, inclination of standard opening in each point of opening does not change with the original curve.
• Add opening provided in Difference in Capacity in the table below to the standard opening from 1 to 8,
when capacity of the indoor unit is excluding code 1.
• Add opening provided in Difference in Operation number in the table below to determined LEV opening for
each indoor unit, when 2 or 3 indoor units are operated at the same time.
Note: Even when the adjusted standard opening exceeds the driving range from 59 to 500 pulse, actual
driving output opening is in a range from 59 to 500 pulse.
< Calculation example of LEV opening >
Cool operation: Compressor frequency 70Hz: 2 unit ON: 18class
(170-150)p(80-60)o(70-60)+150+75-30=205 pulse
19
<Correction>
COOL
DRY
HEAT
1 Suction super heat
(MIN gas pipe temperature thermistor - Evaporation temperature thermistor)
2 Each correction w 1
-
• •
• (Each gas pipe temperature thermistor - Evaporation temperature thermistor)
• (Main pipe temperature thermistor - sub pipe temperature thermistor)
3 Discharge temperature
w 2
w 2
• • •
w 1 Perform this, when number of operation units is 2units or more
w 2 When the correction opening of suction super heat is 0, correct the LEV opening by dischaege temperature.
(1) LEV opening correction by suction super heat (COOL, DRY)
(Suction super heat) = (Minimum gas pipe temperature) - (Evaporation temperature)
When COOL and DRY , correct the LEV openings corrected from the table below
LEV opening
correction (pulse)
Suction superheat (S.H.)
more than 12
10 to12
8 to 10
6 to 8
6 or less
6
4
3
2
0
(2) Separate correction (COOL,DRY)
(When number of operation unit is 2 units or more)
(a) Correction by the separate super heat
Correct the LEV separately by temperature difference between each gas pipe temperature thermistor and evaporator
temperature thermistor.
1 Calculate each super heat of the unit from the expression below;
(Super heat) = (Gas pipe temperature thermistor) - (Evaporation temperature thermistor)
2 Select a minimum super heat from among them.
3 Correct an each LEV is corrected opening is corrected by difference between each super heat and minimum super
heat.
20
(3) LEV opening correction by discharge temperature
When LEV correction output is 0 pulse by the suction super heat at cool or dry operation, or dry operating, correct LEV is cor-
rected according to the following table.
The target discharge temperature is determined according to frequency zone and number of operation unit of the
compressor.
Correct the LEV opening according to difference between the target discharge temperature and discharge temperature.
11-2.Operational frequency range
Number of
operating
unit
COOL
HEAT
capacity
cord
DRY
25
Min. Max. Rated
Min. Max. Rated
1
2
3
4
2
3
4
5
6
7
8
3
4
5
6
7
8
9
40
52
68
85
32
40
46
73
62
70
80
86
36
49
65
80
18
18
1
80
70
95
80
105
80
105
88
2
20
40
58
22
Note: When the fan speed of indoor unit is totally
Lo notch, restrict the maximum frequency is
restricted in 6/7 of the rated frequency.
110
115
90
71
115 100
120 102
DRY COOL
Maximum frequency
1
2
1
1
2
3
1
2
2
3
1
1
8/10 of maximum frequency
3
30
26
9/10 of maximum frequency
7/10 of maximum frequency
21
11-3.Heat defrosting control
(1) Conditions to enter defrosting mode
1. When temperature of defrosting thermistor is -3; or less.
2.When specified non-defrosting time, is counted in the control p.c.board is satisfied.
(Total time of compressor operating)
Going to defrosting mode at both condition of 1 and 2.
(2) Defrosting operation
1. Compressor stops for 50 seconds, Indoor fan is off, Defrosting lamp lights
2.4-way valve reverses flow, Compressor operates by the frequency in heat defrosting control.
3. After compressor stops for 35 seconds, 4-way valve reverses flow, then defrosting finishes.
(3) Conditions to finish defrosting mode
1. When the defrosting thermistor temperature is 8; or more.
2. When it has spent 10 minutes for defrosting.
Defrosting finishes at condition of 1 or 2.
11-4.High pressure protection
(1) High pressure protection control on heat mode
Temperature of the main pipe temp. thermistor in the indoor unit controls the operation frequency.
When temperature of the main pipe temp. thermistor is approx. 49;, the operation frequency is set at the current level.
When temperature of the main pipe temp. thermistor is approx. 52; the protection control decreases the frequency at the
speed of 3Hz a minutes.
When temperature of the main pipe temp. thermistor is approx. 57; the protection decreases the frequency at the speed of
4Hz a minute and changes the outdoor fan to Low.
Note: Temperature of the pipe temp. thermistor is different depending on the indoor unit.
Temperature of the pipe temp. thermistor is 45; or less, the protection control is Released.
(2) High pressure protection control by high pressure switch (H.P.S)
High-pressure switch controls the operation frequency and outdoor fan motor.
<Control status>
When high-pressure switch is ON.
(When discharge pipe pressure is 2.75 MPa or more.)
<Control details>
(a) When cooling or drying
The protection control decreases the compressor frequency at the speed of 10Hz a minute.
(The compressor operates continuously in min. frequency according to a command to decrease more than the min. level.)
(b) When heating
The protection control decreases the compressor frequency at the speed of 10Hz a minute.
The protection control changes the outdoor fan to Low.
<Release status>
When high-pressure switch is OFF. (When discharge pipe pressure is 2.35 MPa or more.)
Or, the compressor stops.
11-5.Discharge temperature protection control
This protection controls the compressor ON/OFF and operation frequency according to temperature of the discharge temp.
thermistor.
(1) Compressor ON/OFF
When temperature of the discharge temp. thermistor exceeds 116;, the control stops the compressor.
When temperature of the discharge temp. thermistor is 80; or less, the controls starts the compressor.
(2) Compressor operation frequency
When temperature of the discharge temp. thermistor is expected to be higher than 116;, the control decreases 12Hz from the
current frequency.
When temperature of the discharge temp. thermistor is expected to be higher than 111; and less than 116;, the control
decreases 6Hz from the current frequency.
When temperature of the discharge temp. thermistor is expected to be higher than 104;and less than 111;, the control is set
at the current frequency.
22
11-6.Refrigerant recovery control on heating
<Control status>
The control performs when the following status are satisfied everything;
• When there is 1 unit or more not operating indoor unit on heat operation. (Excluding thermo OFF)
• When discharge temperature becomes 107; or more.
• When it passed 60 minutes or more since the operation has started or the last refrigerant recovery has controlled.
<Control details>
LEV opening, which adjusts to not operating indoor unit, is considered to be 80 pulse.
<Control finish status>
The control finishes either as follows. However, the LEV opening is considered to be 59 pulse.
• When it passed 60 seconds since the control has started.
• When the discharge temperature is 90; or less.
11-7.Outdoor fan control
Fan speed is switched according to a number of operating indoor unit and the compressor frequency.
Note
•When operation, fan speed of Hi/ Low mode changes to VHi/ Hi mode by promoting those fan speeds respectively by
1 step after defrosting is operated. This control is cleared, when the compressor off.
•When overheat protection of P.C. board temperature or fin temperature operates, the outdoor fan speed is fixed to VHi
mode regardless of compressor frequency. Also, when the overheat protection is cleared, the fan speed is
back to normal
•When the indoor coil thermistor is 57; or more on HEAT operation, fan speed is fixed to Low notch .
Or, the indoor coil thermistor is 45; or less on HEAT operation, fan speed is back to normal.
11-8.Relation between main sensor and actuator
Relation between main sensor and actuator.
23
12 TROUBLESHOOTING
12-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the following during servicing.
1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the unit, and then after con-
firming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
2) Be sure to unplug the power cord before removing the front panel, the cabinet, the top panel, and the electronic con-
trol P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Housing point
Lead wiring
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
3) When troubleshooting, refer to the flow chart on this page and the check table on page 25, 26.
12-2. Instruction of troubleshooting
• Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor unit.
Then, check the outdoor unit with referring to this page.
Operation start
Check the outdoor unit
LED indicator
Display other than "00"
"00"
OFF
A Check of power supply
See page 28.
Refer to indicator list
See page 25, 26.
• Indoor unit
serial signal
error
B Check of
serial signal
See page 28.
• Cool or HEAT • When cooling, heat • When cooling,
• When heating,
• When cooling,
room does not
cool.
opereation only exchanger of
dew drops in the room doed not get
non-operating indoor non-operating warm.
C Check of
R.V.coil
See page 29.
unit frosts.
indoor unit
E Check of
inverter,compressor
See page 30.
Check mis-piping
Shortage of capacity
E Check of
•When heating, non
Check of mis-
inverter,
compressor
See page 30.
operating indoor unit piping.
gets warm.
D Check of LEV
See page 30.
24
12-3. Troubleshooting check table
Note . LED indicates "00" in the normal status.
7-segment LED display
00
Error mode
Normal
❈ If there is defect in the following parts(electronic control P.C. board, relay P.C. board, high pressure
switches(63H1,63H2),indoor /outdoor fan motor , or indoor coil thermistor), the compressor may stop even with the display
remained at “ 00 “.In any case, reset the breaker and check the above-stated parts.
Symptom
Display
Outdoor unit does not operate.
Detecting method
Detecting method
Check points
• Inverter output
When the compressor operation has been interrupted by overcurrent
protection continuously three times within 1 minute after start-up, the
compressor stops operation.
Outdoor power system abnor-
mality
a4
(A4)
• Compressor
Outdoor electronic control P.C. When the nonvolatile memory data cannot be read properly on the out-
a3
(A3)
• Outdoor electronic control P.C. board
board abnormality
door controller board
When the drain abnormality is detected in the indoor unit and the indoor • Check the abnormality indication on the
Indoor unit and LEV abnor-
mality
p1
(P1)
main coil temperature is too low, or when any abnormality is detected in
the components of indoor unit
indoor unit.
• LEV
Symptom
Display
Outdoor unit stops and restarts every 3 minutes.
Detecting method
Detecting method
Check points
• Check the characteristic of the evapora-
tion temperature thermistor. Refer to F
on page 31.
• Check the contact of P. C. board con-
nectors.
Evaporation temperature ther- The compressor stops when a short or open circuit occurs in the evap-
e9
(E9)
mistor abnormality
oration temperature thermistor during compressor running.
• Check the characteristic of the discharge
temperature thermistor. Refer to F on
page 31.
• Check the contact of P. C. board con-
nectors.
Discharge temperature ther-
mistor abnormality
The compressor stops when a short or open circuit occurs in the dis-
charge temperature thermistor during compressor running.
e6
(E6)
• Check the characteristic of the fin temper-
ature thermistor. Refer to F on page 31.
• Check the contact of P.C. board connec-
tors.
Fin temperature thermistor
abnormality
The compressor stops when a short or open circuit occurs in the fin tem-
perature thermistor during compressor running.
f8
(F8)
• Check the inverter and compressor.
Refer to E on page 30.
• Check the amount of gas.
• Check the indoor/outdoor air flow for
short cycle.
• Check the indoor unit air filter for
clogging.
When over current is applied to the power module, the compressor
stops and restarts in 3 minutes.
a8
(A8)
Overcurrent protection
When the discharge temperature thermistor detects 116˚C or above, the
compressor stops and restarts operation in 3 minutes.
(Protection will be released at 100; or below.)
• Check the amount of gas and the refriger-
ant cycle.
• Check the outdoor unit air passage.
Discharge temperature over-
heat protection
d6
(d6)
• Check the outdoor unit air passage.
Fin temperature overheat pro- When the fin temperature thermistor detects 89˚C or above, the com- • Check the power module.
d4
(d4)
tection
pressor stops and restarts operation in 3 minutes.
• Check the outdoor fan motor. Refer to G
on page 31.
• Amount of gas
• Outdoor unit air passage.
• Check the ball valve.
When the compressor starts, primary current or output voltage stops the
compressor and restarts in 3 minutes.
d7
(d7)
High pressure protection
• Room A gas pipe temperature thermistor
characteristic.
• Contact of P.C. board connectors.
Room-A gas pipe temperature When a short or open circuit occurs in the Room-A gas pipe
thermistor abnormality temperature thermistor.
f5
(F5)
• Room B gas pipe temperature thermistor
characteristic.
• Contact of P.C. board connectors.
Room-B gas pipe temperature When a short or open circuit occurs in the Room-B gas pipe
thermistor abnormality temperature thermistor.
f6
(F6)
• Room C gas pipe temperature thermistor
characteristic.
• Contact of P.C. board connectors.
Room-C gas pipe temperature When a short or open circuit occurs in the Room-C gas pipe
thermistor abnormality temperature thermistor.
f7
(F7)
25
Symptom
Display
Outdoor unit operates. (The compressor operates at reduced frequency.)
Detecting method
Detecting method
Check points
Frequency drop by current
protection
When the outdoor unit input current exceeds 22.5 A, the compressor
operates at reduced frequency.
d8
(d8)
Frequency drop by overload
protection
When the compressor load exceeds the specified value, the compres-
sor operates at reduced frequency.
d9
(d9)
These symptoms do not mean any
abnormality of the product, but check the
Frequency drop by high pres- When indoor pipe temperature exceeds 55˚C during heating, the com- following points.
sure protection
pressor operates at reduced frequency.
• Air filter clogging.
• Amount of gas.
• Short cycle of indoor/outdoor air flow.
d7
(d7)
Frequency drop by defrosting When the indoor pipe temperature falls to 6˚C or below during cooling,
in cooling
the compressor operates at reduced frequency.
Frequency drop by discharge When the discharge temperature exceeds 110˚C, the compressor oper-
d6
(d6)
temperature protection
ates at reduced frequency.
When the high pressure exceeds 2.75MPa (28 kgf/cm2-G), the com-
pressor operates at reduced frequency. In addition, the fan speed
changes.
Frequency drop by high pres-
sure switch protection
• Amount of gas.
• Outdoor unit air passage.
d3
(d3)
Check the amount of gas.
• Replace the outdoor controller board.
• Check the contact of LEV board connec-
tors.
When the state with low discharge temperature of which 50˚C in COOL
and 48.4 or less in HEAT for 20 minutes, the compressor operates con-
tinuously.
Low discharge temperature
protection
d1
(d1)
Symptom
Display
Outdoor unit operates.
Detecting method
Detecting method
Check points
When a short or open circuit occurs in the defrost thermistor during
Defrost thermistor abnormality heating
* In this case, the compressor continues to operate.
• Defrost thermistor characteristic.
• Contact of P. C. board connectors.
e7
(E7)
Power factor detection abnor- When the compressor power factor cannot be detected
h4
(h4)
• Compressor wiring.
mality
* In this case, the compressor keeps running.
26
12-4. Trouble criterion of main parts
Part name
Check method and criterion
Measure the resistance using a tester.
Defrost thermistor
Evaporation / Gas pipe
temperature thermistor
(Part temperature -10°C ~ 40°C)
Normal
5kΩ ~ 55kΩ
abnormal
Opened or short-circuited
Measure the resistance using a tester, after warming up the thermistor by holding by hand.
(Part temperature : 20°C ~40°C)
Discharge temperature
thermistor
Normal
abnormal
100kΩ ~ 250kΩ
Opened or short-circuited
Measure the resistance between terminals using a tester.
(Winding temperature : -10°C ~ 40°C)
Compressor
W
RED
Normal
1Each phase 0.53Ω ~ 0.66Ω
abnormal
Opened or short-circuited
V
WHT
U
BLK
Outdoor fan motor
Measure the resistance between lead wires using a tester.
(Part temperature : -10°C ~ 40°C)
WHT
P
ORN
RED
BLU
YLW
BLK
Normal
abnormal
WHT - BLK
BLK - YLW
YLW - BLU
RED - BLK
69.0Ω ~ 86.0Ω
23.0Ω ~ 30.0Ω
10.0Ω ~ 13.0Ω
73.0Ω ~ 91.0Ω
Opened or
short-circuited
(Not including
WHT - ORN)
Protector specification
Short 95I15:
Open 135I5:
Measure the resistance using a tester. (Part temperature -10°C ~ 40°C)
R. V. coil
Normal
1640Ω ~ 2310Ω
abnormal
Opened or short-circuited
Linear expansion valve
Measure the resistance using a tester.(Part temperature -10°C ~ 40°C)
WHT
Lead wire color
WHT - RED
RED - ORN
YLW - BRN
BRN - BLU
Normal
Abnormal
RED
LEV
ORN
43Ω ~ 52Ω
Opened or short-circuited
YLW BRN BLU
Measure the resistance using a tester.
(Part temperature -10°C ~ 40°C)
Pressure
Normal abnormal
Operation OFF
High pressure switch
(HPS)
HPS1
HPS2
HPS1
HPS2
2.35 ± 0.15MPa (24 ± 1.5kg / cm2)
2.55 ± 0.2MPa (26 ± 2kg / cm2)
Short
Other than
those list-
2
0.05
0.1
0.5
1.0
2.75+-
MPa (28 +
kg / cm )
ed at left
-
Open
MPa (35 + 1.5kg / cm2)
0
0
0.15
3.43+-
-
P Inner protector
27
Outdoor unit does not operate. (LED display: display OFF)
A
Check of power supply
Start
Check the connecting of main circuit parts and connector (CN501: I.P.M P. C. board,
CN 801: Electronic control P. C. board, CN554: relay P. C. board)
Turn on power supply
Is there voltage of 230V AC in the
power supply terminal block?
No
No
Check the power supply cable.
Yes
Is there voltage of 230V AC across
the output cable (LD63, LD64) in the
noise filter P. C. board?
Is there voltage of 310V DC - 340V DC
across the smoothing capacity?
Replace the noise
filter P. C. board
No
No
Yes
Yes
Replace the electronic control P. C. board.
Is there voltage of 230V AC across
the input terminal part in the diode
module (DS61)?
Replace the current
limiting resistor.
w When replacing, check the
connection of connector
CN720 in the outdoor
electronic control P. C.
board
Yes
Check the main circuit parts
and replace it.
Outdoor unit does not operate. (LED display: 00)
B
Check of serial signal
Start
1. Check the indoor unit with referring to the indoor unit service manual
2. Turn off the power supply of the indoor and outdoor unit and return the indoor/ outdoor unit
connecting wire to former original.
3. Check the connection of indoor/ outdoor unit connecting wire in the outdoor unit terminal block,
and check the connection of the connector (CN601: unit A, CN 602: unit B, CN603: unit C,) in
the electronic control P. C. board
4. Disconnect the lead wire to the compressor. Turn on the power supply (indoor/ outdoor unit)
3 minutes later, EMERGENCY OPERATION starts.
Is there voltage of 5V DC - 10V DC between
No. 3 (+) and N (-) in the outdoor terminal block.
No
Replace the electronic control P. C. board.
Yes
Recheck a connected circumstance of the indoor/ outdoor unit connecting wire.
28
The cooling operation or heating operation does not operate. (LED display: 00)
C
Check of R. V. coil
• When heating operation does not work.
Start
1. Disconnect the lead wire leading to the compressor.
2. Turn on power supply to the indoor and outdoor unit, three minutes later
EMERGENCY OPERATION (HEAT operation) starts.
1. Turn off power supply of indoor and outdoor unit, and
disconnect the connector (CN851, CN852) in the electronic
control P. C. board.
Is there voltage of 230V AC between pin1 and
pin 2 at connector CN913?
No
2. Turn on power supply to the indoor and outdoor unit, three
minutes later EMERGENCY OPERATION
(HEAT operation) starts.
Yes
Turn off power supply of indoor and outdoor unit.
Disconnect the connector
CN913 in noise filter P. C.
board, and measure the
resistance of R. V. coil to
check the integrity.
Is there voltage 12V DC between
the connector CN852 pin 1 (+)
and pin 5 (-)?
No
Replace the electronic
control P. C. board.
No
Replace the R. V. coil
Yes
Yes
Replace the noise filter P. C. board.
Replace the 4-way valve
• When cooling operation does not work.
Start
1. Disconnect the lead wire leading to the compressor.
2. Turn on power supply to the indoor and outdoor unit, three minutes later
EMERGENCY OPERATION (COOL operation) starts.
Is there voltage of 230V AC between pin1 and
pin 2 at connector CN913?
No
Replace the 4-way valve
Yes
1. Turn off power supply of indoor and outdoor unit, and
disconnect the connector (CN851, CN852) in the electronic
control P. C. board.
2. Turn on power supply to the indoor and outdoor unit, three
minutes later EMERGENCY OPERATION
(COOL operation) starts.
Is there voltage 12V DC between
No
the connector CN852 pin 1 (+)
Replace the noise filter P. C. board.
and CN851 pin 5 (-)? W1
W1If the connector CN913 is not connected or R. V. coil is open, voltage
occurs between terminals even when the control is OFF.
Yes
Replace the electronic control P. C. board.
29
• When cooling, heat exchanger of non-operating indoor unit frosts.
• When heating, non-operating indoor unit get warm.
(LED display: 00, p1)
D
Check of LEV
Start
Turn on power supply to the outdoor unit after checking LEV coil is mounted to the
LEV body securely.
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
Yes
Nomal
No
Disconnect the connector
Yes
(CN791: unit A, CN792: unit B, CN793: unit C), and
measure the resistance of LEV coil to check the
integrity.
Replace the electronic
control P. C. board
No
Replace the LEV coil.
• When heating, room does not get warm.
• When cooling, room does not get cool.
(LED display: 00, a8)
E
Check of inverter/ compressor
Start
Disconnect the lead wire to the compressor at terminals, and turn on power supply to the indoor
and outdoor unit. Three minutes later, EMERGENCY OPERATION starts.
W1 • After the outdoor fan starts running, wait for 1 minutes or more before
measuring the voltage.
• The output voltage values in the above table have the tolerance of i20%.
Measure the voltage between
each leading to the compressor.
U (BLK) - V (WHT)
1. Turn off power supply of the indoor
and outdoor unit, and disconnect
the connector CN 551 in the relay
P. C. board
2. Turn on power supply to the outdoor
unit, and after 1 minutes or more
passed, check the resistance
between the connector
V (WHT) - W (RED)
W (RED) - U (BLK)
Output voltage
COOL: 100V(58Hz) HEAT: 100V(58Hz)
Is voltage output? W1
No
LED indicator the inverter
stops due to over current?
No
Yes
Replace the electronic
control P. C. board
with the I.P.M P. C. board.
Yes
No
Is output balanced?
Yes
CN551 pin 1 and pin 2.
Turn off power supply of indoor and outdoor unit,
and measure the compressor winding resistance
between the compressor terminals.
Is there resistance of 0.27" to 0.34" between
the each terminals?
0" Check the resistance
No
between each terminal
Infinite
Replace the
compressor.
Yes
After 1 minutes has passed since the
power supply of outdoor unit was
turned off, disconnect the connector
CN 553 in the noise filter P. C. board.
Return the lead wire of compressor to former, and
turn on power supply to indoor and outdoor unit.
Three minutes later EMERGENCY OPERATION starts.
0"
Check the resistance
HPS (63H2).
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor rare short
10 to 60 seconds: compressor lock
Infinite
60 seconds to 5minutes: refrigerant circuit defective
5 minutes or more: normal
Replace the
HPS (63H2).
Replace the
relay P. C. board.
30
• When thermistor is abnormal. (When the LED display is a table below.)
F
Check of thermistor
LED
E7
E6
E9
F5
F6
F7
d4
Thermistor
Defrost thermistor
Symbol
RT62
RT61
RT63
RT66
RT67
RT68
RT65
Connector, Pin No.
Between CN661 pin1 and pin2
Between CN661 pin3 and pin4
Between CN661 pin5 and pin6
Between CN662 pin1 and pin2
Between CN662 pin3 and pin4
Between CN662 pin5 and pin6
Between CN663 pin1 and pin2
Discharge temperature thermistor
Evaporation temperature thermistor
Gas pipe temperature thermistor (Unit A)
Gas pipe temperature thermistor (Unit B)
Gas pipe temperature thermistor (Unit C)
Fin temperature thermistor
Start
Abnormal
Disconnect the connector in the electronic control P. C. board (see above table), and
measure the resistance of thermistor to check whether the thermistor is normal or not.
Replace the thermistor
Normal
Reconnect the connector (CN661, CN662 and CN663) and disconnect the lead wire leading to the compressor.
Turn on power supply to the indoor and outdoor unit. Three minutes later EMERGENCY OPERATION starts.
No
Does thermistor operate 10 minutes or more though the
thermistor abnormality is not displayed?
Replace the electronic
control P. C. board.
Yes
Normal
• Fan motor does not operate. Or, fan motor stops at once’ after fan motor operates.
G
Check of fan motor
Start
Check the connection of connector (CN851, CN852) in the fan motor relay connector and electronic control P. C. board
at the noise filter P. C. board and connector (CN901, CN902) in the noise filter board.
Disconnect the fan motor connector, and measure the resistance of the
fan motor winding to check the winding characteristic.
Abnormal
Replace the fan motor
Normal
1. Disconnect the lead wire leading to the compressor. Turn on power supply to the
indoor and outdoor unit. Three minutes later, EMERGENCY OPERATION starts.
2. Check the voltage between pin 2 and pin 3, pin 2 and pin 5, pin 2 and pin 6 at the fan motor connector.
Yes
Is there voltage of 230V AC?
No
1. Turn off power supply of the indoor and outdoor unit, and disconnect the connector
(CN851, CN852).
Replace the electronic
control P. C. board
No
No
2. Is the voltage 0V, when the voltage between CN852 pin1 (+) and CN851 pin1 (-),
pin2 (-), or pin3 (-) are measured after the power supply is turned on the outdoor unit?
Yes
Is there voltage of 12V DC between CN852 pin1 (+) and pin3 (-), when power supply
turns on the indoor unit and EMERGENCY OPERATION starts in three minutes.
Yes
Replace the noise filter P. C. board
31
• When the operation frequency does not go up from lowest frequency.
H
Check of HPS
Start
1. Disconnect the connector CN722 in the electronic control P. C. board.
2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turnd off.
Infinity
Check the resistance between
each terminal?
Replace HPS (63H1).
0"
Return CN722 to former.
Turn on power supply to the indoor and outdoor unit.
3 minutes lator, EMERGENCY OPERATION starts.
Yes
Is HPS protection displayed
No
immediately after compressor
starts.
Replace the electronic control P. C. board.
Yes
Normal
I
The other cases
In the case that the indoor fan and outdoor fan operate but the compressor does not operate, it causes that the
high pressure switch can be operated once.
First of all, check the high pressure switch can be shorted, turn OFF the power and turn ON again 1 minute later.
Indoor unit dose not operate. (difference modes)
• When you try to run two indoor unit simultaneously, one for cooling and the other for heating, the unit which
transmits signal to the outdoor units earlier decides the operation mode. The other unit indicates as shown in
the figure below.
• When the above situation occurs, set all the indoor units to the same mode, turn OFF the indoor units, and
then turn them back ON.
• Though the top of the indoor unit sometimes gets warm, this does not mean malfunction. The reason is that
the refrigerant gas continuously flows into the indoor unit even while it is not operating.
OPERATION INDICATOR
Lighting
Flashing
32
Discharge temperature thermistor
Gas pipe temperature thermistor
Evaporation temperature thermistor
Defrost temperature thermistor
TEST POINT DIAGRAM AND VOLTAGE
E1
E2
MXZ-24UV -
, MXZ-24UV -
Electronic control P.C.board
Temperature(;)
Defrost temperature thermistor
2.5~4.0V DC
Discharge temperature thermistor
0.3~0.6V DC
Evaporation temperature thermistor
2.5~4.0V DC
Outdoor fan ON 12V DC
Outdoor fan Lo 12V DC
Temperature(;)
Outdoor fan Me 12V DC
R.V. coil
12V DC
Fin temperature thermistor
1.0~4.0V DC
{
Serial signal Room C 5~10V DC
{
Serial signal Room B
5~10V DC
{
Serial signal Room A
5~10V DC
{
Relay 12V DC
-
Temperature(;)
12V DC
{
+
-
-
-
-
-
-
-
0~5V DC
{
5V DC
Room C
LED monitor indication
Liner expansion valve(LEV)
12V DC pulse wave
{
Room B
High pressure switch
Room A
Gas pipe temperature
thermistor 2.5~4.0V DC
33
Noise filter P.C.board
E1
MXZ-24UV -
{
230V AC
OUTPUT
OUTDOOR FAN
230V AC
{
{
230V AC
INPUT
REVERSING VALVE
230V AC
{
E2
MXZ-24UV -
{
230V AC
OUTDOOR FAN
230V AC
{
OUTPUT
Replace them at
the same time
{
230V AC
INPUT
REVERSING VALVE
230V AC
{
34
I.P.M P.C.board
E1
MXZ-24UV -
E2
MXZ-24UV -
12V DC
12V DC
{
320V DC
Relay P.C.board
E1
MXZ-24UV -
12V DC
E2
MXZ-24UV -
High pressure
switch
{
{
12V DC
Short
35
13
DISASSEMBLY INSTRUCTIONS
E1
E2
MXZ-24UV -
, MXZ-24UV -
OUTDOOR UNIT
OPERATING PROCEDURE
PHOTOS
1.Removing the compressor
Photo 1
(1)Remove the screws of the service panel, and remove it.
Recover refrigerant gas.
(2)Remove the screws of the top panel , and remove it.
(3)Remove the screws of the front panel , and remove it.
(4)Disconnect the compressor lead wire.(TAB64,TAB65,TAB66)
(5)Disconnect the outdoor electronic control P.C. board
connectors CN791, CN792, CN793, CN794, CN662,
CN722, and CN661.Disconnect the noise filter P.C. board
connectors CN913.
Top panel
(6)Remove the four screws of the electrical parts , and remove
them.
Service panel
(7)Remove the propeller.
Front
panel
(8)Remove the screws of the separator, and remove it.
(9)Recover gas from the refrigerant circuit.
(10)Detach the brazed joints of the compressor suction and dis-
charge pipes.(See Photo 3.)
Photo 2
(11)Remove the three compressor nuts and remove the compres-
sor.
Control P.C.board
Electrical parts
Separator
Terminal
Photo 3
Discharge pipe
brazed part
Suction pipe
braxed part
36
OPERATING PROCEDURE
PHOTOS
2.Removing the fan motor
(1)Remove the top panel(five screws),the service panel(four
screws),and the front panel (two screws).(See Photo 1.)
(2)Disconnect the connector CN911 on the outdoor controller
board.
(3)Remove the propeller.
(4)Remove the fan motor.
3.Removing the 4-way valve
(1)Remove the screws of the top panel , and remove it.(See
Photo 1.)
Photo 4
(2)Remove the service panel,rear panel,and connect cover
panel. Recover refrigerant gas.
4 way valve
(3)Remove the electrical parts.(See Photo 2.)
(4)Detach the brazed joint of 4-way valve and pipe.
(See Photo 4.)
R. V. coil
Brazing area
4.Removing the linear expansion valve
(1)Remove the service panel.(See Photo 1.)
Photo 5
(Gas release is not required if the unit is pumped down.)
(2)Remove the coil of linear expansion valve.
(3)Detach the brazed joint of linear expansion valve and pipe.
Linear
expansion
valves
LEV coils
37
OPERATING PROCEDURE
PHOTOS
5.Removing the reactor
(1)Remove the five screws of the top panel , and remove it.(See
Photo 1.)
Photo 6
(2)Disconnect the reactor lead wire.
(3)Remove the two screws of the reactor , and take it out.
Reactor
38
14
PARTS LIST
14-1. OUTDOOR UNIT FUNCTIONAL PARTS
E1
MXZ-24UV -
MXZ-24UV -
E2
1
18 17
16
15
14
13
12
2
11
10
9
8
7
5
6
3
4
Part numbers that are circled are not shown in the illustration.
Symbol
in Wiring
Diagram
MF61
Q'ty / unit
No.
Parts No.
Parts Name
Remarks
E1
E2
MXZ-24UV-
MXZ-24UV-
1
2
3
4
5
T2W E40 301
M21 17A 501
M21 17E 337
T2W E89 451
T2W E79 424
T2W G01 424
T2W E58 376
T2W E70 308
M21 42A 340
M21 42A 308
1
1
1
1
1
RA6V60 -
1
1
1
1
OUTDOOR FAN MOTOR
PROPELLER FAN
L
REACTOR
ELECTRONIC CONTROL P.C. BOARD
NOISE FILTER P.C. BOARD
NOISE FILTER P.C. BOARD
TERMINAL BLOCK
FIN TEMPERATURE THERMISTOR
RELAY
1
3
1
1
1
1
1
1
6
7
8
9
TB2, 3, 4
RT65
3
1
1
1
1
1
1
1
X64
EVAPORATION
DISCHARGE, DEFROST
RT61, 62, 63
TB1
THERMISTOR SET
TERMINAL BLOCK
R. V. COIL
10 T2W E65 375
11 T2W E70 398
12 T2W E88 307
13 M21 17A 362
T2W G01 362
21S4
RT66,67,68
R
A,B,C
GAS PIPE TEMPERATUR THERMISTOR
RESISTOR
10Ω
20Ω
220+ 400V
2500+ 400V
R
1
1
2
1
1
1
1
2
1
RESISTOR
14 T2W E40 357
15 T2W E40 356
16 M21 17A 443
17 M21 17A 447
18 T2W E40 452
19 T2W E40 441
20 T2W E66 382
21 T2W E89 313
C61
1
2
1
1
1
1
2
POWER FACTOR CAPACITOR
SMOOTHING CAPACITOR
DIODE MODULE
C62,C63
DS61
DS62
DIODE STACK
I.P.M P.C. BOARD
RELAY P.C. BOARD
FUSE
F801,F911
F912,NR63
3.15A
FUSE&VARISTOR
39
14-2. OUTDOOR UNIT STRUCTURAL PARTS
E1
MXZ-24UV -
MXZ-24UV -
17
15 14
1
19 18
16
E2
13
12
11
10
9
8
7
6
4
5
2
3
Part numbers that are circled are not shown in the illustration.
Symbol
Q'ty / unit
No.
Parts No.
Parts Name
in Wiring
Diagram
Remarks
E1
E2
MXZ-24UV-
MXZ-24UV-
1
2
3
4
M21 AS2 232 FRONT PANLE
M21 17A 245 SERVICE PANEL
T92 500 800 COMPRESSOR
M21 90V 646 EXPANSION VALVE
T2W E70 653 EXPANSION VALVE COIL
T2W E95 653 LEV COIL
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
3
1
1
MC
THV247FBA
C room
LEV C
5
6
7
T2W E95 655 EXPANSION VALVE
T2W E70 651 EXPANSION VALVE COIL
T2W E95 651 LEV COIL
LEV A
LEV B
A room
T2W E95 655 EXPANSION VALVE
T2W E70 652 EXPANSION VALVE COIL
T2W E95 652 LEV COIL
B room
T2W E95 655 EXPANSION VALVE
T2W E79 290 BASE ASSEMBLY
M21 42E 644 UNION
8
9
1/2,3/8,1/4 SET
10 T2W E40 247 PIPE COVER
11 M21 AN8 667 BALL VALVE 3/8
12 M21 HG1 667 BALL VALVE 5/8
13 T2W E70 248 REAR PANEL
14 M21 48A 961 4-WAY VALVE
15 T2W E79 646 HIGH PRESSURE SWICH
16 M21 17A 297 TOP PANEL
2.75MPa(28kg/cm2)
63H1
63H2
17 T2W E40 523 REAR GUARD
18 M21 42E 630 HEAT EXCHANGER
19 M21 17A 249 SIDE PANEL
3.43MPa(35kg/cm2)
[4.0O[2.4O400
20 T2W E40 646 HIGH PRESSURE SWICH
21 M21 986 936 CAPILLARY TUBE
22 M21 LV0 936 CAPILLARY TUBE SET
23 T2W E59 936 CAPILLARY TUBE
24 T2W E70 936 CAPILLARY TUBE
[3.0O[2.0O200 4PCS/SET
[2.5O[0.6O1000
[2.5O[0.6O750
When servicing , cut the tube to the proper length as shown in the REFRIGERANT SYSTEM DIAGRAM.
See page 11.
40
14-3. ACCESSORY PARTS
E1
MXZ-24UV -
MXZ-24UV -
E2
1
Symbol
in Wiring
Diagram
Q'ty / unit
No.
1
Parts No.
Parts Name
Remarks
E1
E2
MXZ-24UV -
MXZ-24UV -
DRAIN SOCKET O1
DRAIN CAP O2
T2W E59 704
1
DRAIN SOCKET ASSEMBLY
41
15
OPTIONAL PARTS
15-1. Different-diameter pipe
Connected pipes
diameter (mm)
MXZ-24UV
Model name
MAC-454JP
MAC-455JP
MAC-456JP
{9.52 — {12.7
(3/8)
(1/2)
For different-
diameter
pipes
{12.7 — {9.52
(1/2) (3/8)
{12.7 — {15.88
(1/2)
(5/8)
15-2. Outlet guide
Changes air discharge direction.
Applied unit
MXZ-24UV
Model name
MAC-855SG
Model code
51H-855
150
610.4
534
386
109.4
5 - [6
Punxhed hole
51.8
5 - [6
Punxhed hole
386
534
MAC-855SG
42
HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN
New publication, effective Jan. 2003
Specifications subject to change without notice.
C Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Jan. 2003. No.OB287 REVISED EDITION-A 7
Distributed in Oct. 2001. No.OB287 248
Made in Japan
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