Mitsubishi Electronics Mxz 24uv E2 User Manual

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  
2345 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  
Indoor  
Outdoor  
DB(°C) 20.0  
WB(°C) 14.5  
DB(°C)  
WB(°C)  
2
1
7
6
15 20.0  
12 14.5  
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  
Indoor  
Outdoor  
DB(°C) 20.0  
WB(°C) 14.5  
DB(°C)  
WB(°C)  
2
1
7
6
15 20.0  
12 14.5  
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  
Indoor  
Outdoor  
DB(°C) 20.0  
WB(°C) 14.5  
DB(°C)  
WB(°C)  
2
1
7
6
15 20.0  
12 14.5  
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  
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.  
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  
Indoor  
Outdoor  
DB(°C) 20.0  
WB(°C) 14.5  
DB(°C)  
WB(°C)  
2
1
7
6
15 20.0  
12 14.5  
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  
5k~ 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  
100k~ 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 0.53~ 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  
69.0~ 86.0Ω  
23.0~ 30.0Ω  
10.0~ 13.0Ω  
73.0~ 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  
1640~ 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  
43~ 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  
10  
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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