Mitsubishi Electric MXZ-24UV - E1 User manual

SERVICE MANUAL
CONTENTS
1. PART NAMES AND FUNCTIONS······················2
2. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························3
3. INDOOR UNITS COMBINATION·······················4
4. SPECIFICATION·················································6
5. NOISE CRITERIA CURVES······························ 7
6. OUTLINES AND DIMENSIONS ························ 8
7. WIRING DIAGRAM ············································9
8. REFRIGERANT SYSTEM DIAGRAM··············10
9. PERFORMANCE CURVES······························11
10. MICROPROCESSOR CONTROL ····················17
11. TROUBLESHOOTING······································23
12. DISASSEMBLY INSTRUCTIONS·····················34
13. PARTS LIST······················································37
14. OPTIONAL PARTS ······················BACK COVER
Inverter-controlled multi system
Model
MXZ-24UV - E1
No. OB287
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.
Model indication
SPLIT-TYPE, HEAT PUMPAIR CONDITIONER
OB287--1.qxp 10/9/01 3:29 PM Page 1

OUTDOOR UNIT Air inlet
Air outlet
(back and side)
Model indication
MXZ-24UV- E1
2
PART NAMES AND FUNCTIONS
1
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3
2INDOOR / OUTDOOR CORRESPONDENCE TABLE
❈There is no combination other than this table.
MXZ-24UV- E1
OUTDOOR UNIT
Combination of the connectable indoor units
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
NOTE: MCFH-13NV, SEH-1.6AR is equivalent to class 12 (12000BTU).
SEH-2AR is equivalent to class 18 (18000BTU).
OB287--1.qxp 10/9/01 3:29 PM Page 3

4
07
09
12
18
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
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
3.62
4.35
6.96
11.11
7.44
7.83
11.01
14.40
9.18
13.19
14.40
14.40
14.40
14.40
8.94
10.05
10.05
10.05
10.05
10.05
10.05
10.05
10.05
2.2
(0.9-2.7)
2.8
(0.9-3.2)
4.0
(0.9-4.5)
5.0
(0.9-5.4)
4.4
(1.8-5.4)
5.0
(1.8-5.8)
6.2
(1.8-6.7)
7.1
(1.8-7.6)
5.6
(1.8-6.2)
6.8
(1.8-7.4)
7.1
(1.8-7.6)
7.1
(1.8-7.6)
7.1
(1.8-7.6)
7.1
(1.8-7.6)
6.6
(2.4-8.1)
7.1
(2.4-8.5)
7.1
(2.4-8.5)
7.1
(2.4-8.5)
7.1
(2.4-8.5)
7.1
(2.4-8.5)
7.1
(2.4-8.5)
7.1
(2.4-8.5)
7.1
(2.4-8.5)
750
(260-930)
900
(260-1040)
1440
(260-1700)
2300
(260-2980)
1540
(580-1960)
1620
(580-2050)
2280
(580-2540)
2980
(580-3450)
1900
(580-2180)
2730
(580-3230)
2980
(580-3450)
2980
(580-3450)
2980
(580-3450)
2980
(580-3450)
1850
(700-3650)
2080
(700-4070)
2080
(700-4070)
2080
(700-4070)
2080
(700-4070)
2080
(700-4070)
2080
(700-4070)
2080
(700-4070)
2080
(700-4070)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2.2
2.8
3.4
3.8
2.55
3.15
3.55
2.37
3.0
—
—
—
—
2.2
2.8
4.0
4.95
2.8
4.0
4.55
3.55
3.95
3.55
2.2
2.15
1.85
1.65
2.55
2.2
2.0
2.37
2.05
2.2
2.8
4.0
5.0
2.2
2.2
2.2
2.15
2.8
2.8
2.55
3.55
3.15
3.55
2.2
2.15
1.85
1.65
2.0
1.75
1.55
2.37
2.05
Indoor units
combination Unit A Unit B Unit C
Cooling capacity (kw) Total Outdoor unit
power consumption
(w) Current
(A) Power
factor
(%)
NOTE: Electrical data is for outdoor unit only.
MXZ-24UV - E1
INDOOR UNITS COMBINATION
3
NOTE: MCFH-13NV, SEH-1.6AR is equivalent to class 12 (12000BTU).
SEH-2AR is equivalent to class 18 (18000BTU).
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5
NOTE: Electrical data is for outdoor unit only.
07
09
12
18
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
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
90
5.46
6.38
9.23
11.11
9.32
9.90
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
3.2
(0.9-4.1)
4.0
(0.9-4.8)
6.0
(0.9-7.2)
7.1
(0.9-7.8)
6.4
(1.8-7.2)
7.2
(1.8-8.7)
8.6
(1.8-10.6)
9.0
(1.8-10.9)
8.0
(1.8-10.1)
8.8
(1.8-10.8)
9.0
(1.8-10.9)
9.0
(1.8-10.9)
9.0
(1.8-10.9)
9.0
(1.8-10.9)
8.6
(2.1-10.6)
9.0
(2.1-10.9)
9.0
(2.1-10.9)
9.0
(2.1-10.9)
9.0
(2.1-10.9)
9.0
(2.1-10.9)
9.0
(2.1-10.9)
9.0
(2.1-10.9)
9.0
(2.1-10.9)
1130
(270-1600)
1320
(270-1700)
1900
(270-2570)
2300
(270-2830)
1930
(470-2300)
2050
(470-2680)
2550
(470-3800)
2730
(470-3880)
2350
(470-3560)
2640
(470-3850)
2730
(470-3880)
2730
(470-3880)
2730
(470-3880)
2730
(470-3880)
2420
(520-3000)
2500
(520-3180)
2500
(520-3180)
2500
(520-3180)
2500
(520-3180)
2500
(520-3180)
2500
(520-3180)
2500
(520-3180)
2500
(520-3180)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
2.87
3.5
4.4
4.7
3.2
4.1
4.5
3.0
3.9
—
—
—
—
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
3.2
4.0
6.0
7.1
3.2
3.2
3.2
2.8
4.0
3.5
3.25
4.5
4.1
4.5
2.87
2.75
2.3
2.15
2.6
2.2
2.0
3.0
2.55
Indoor units
combination Unit A Unit B Unit C
Heating capacity (kw) Total Outdoor unit
power consumption
(w) Current
(A) Power
factor
(%)
NOTE: MCFH-13NV, SEH-1.6AR is equivalent to class 12 (12000BTU).
SEH-2AR is equivalent to class 18 (18000BTU).
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6
4SPECIFICATION
Outdoor model
Indoor units number
Indoor units total capacity (Connectable)
Indoor units total capacity (Simultaneous operation)
Piping total length
Connecting pipe length
Height difference (Indoor ~ Outdoor)
Height difference (Indoor ~ Indoor)
Function
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Crankcase heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at20:)
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Sound level (High)
Fan speed (High)
Fan speed regulator
Refrigerant filling
capacity(R22)
Refrigerating oil (Model)
Thermistor RT61
Thermistor RT62
Thermistor RT63
Thermistor RT65
Thermistor RT66,67
Thermistor RT68
kW
R/h
K/h
A
A
W
A(kW)
W
%
A
A
A
W
"


"
mm
kg
dB
rpm
kg
cc
k"
k"
k"
k"
k"
k"

Compressor Electrical
data
Fan motor
Special remarks
Capacity System
Coefficient of performance(C.O.P)
Outdoor unit power supply
MXZ-24UV - E1
Single phase
230V,50Hz
2 to 3
✽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
10
2520
25
—
—
90.0
12.08
0.6
THV247FBA (ROTARY)
2000
U-V 0.61
V-W 0.61 W-U 0.61
RA6V60-BA
WHT-BLK 78.7 BLK-YLW 26.9
YLW-BLU 11.7 BLU-RED 83.6
900o900o320 (+35)
79
550
3
3.9
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:)
Cooling
7.1 (0.9~8.5)
—
10.05
2080 (260~4070)
8.7
2.68
46
Heating
9.0 (0.9~10.9)
—
12.08
2500 (270~3180)
9.1
3.35
47
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
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.
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7
NOISE CRITERIA CURVES5
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions.
Cooling :DB35: WB24:
Heating :DB 7:WB 6:
COOL
NOTCH
HEAT
46
SPL(dB(A))
47
LINE
MXZ-24UV - E1
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8
OUTLINES AND DIMENSIONS
6
MXZ-24UV -E1
Unit: mm
OUTDOOR UNIT
23
10 35320 900
88
460
50
900
250
381.8
531.3
317 23
33
Handle for
moving Air in
Indoor and
outdoor
connect wiring
23✕45 hole
Air in
C unit connection
B unit connection
A unit connection
6.35 (flared) 1/4
Liquid pipe
12.7 (flared) 1/2 (A , B unit)
9.52 (flared) 3/8 (C unit)
[
[
[
1.Installation space
2.Service space
More than
100
More than 200
More than 100
More than 500
More than 500
More than
100 More than
100
More than
350
Base bollt length
Less than
25
More than
350
More than
350
Service space
Air in
2-U-shape notched holes
(Base bolt M10)
(Base bolt M10)
Air in
Air out
200 200
387 355
27 40
(16) (16)
500
Veranda Base
Rubber cushion
More than 500
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.)
Note : Leave front and overhead
clearance fully.
Note : Leave front, overhead and
both clearance fully.
2-12 ✕ 36 Oval hole
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9
WIRING DIAGRAM
7
POWER SUPPLY
~/N 230V
50Hz
INDOOR
UNIT (A)
CIRCUIT BRAKER
TB1
TB2
TB3
TB4
BLU
RED
TB5
X64
GRN/YLW
GRN
CN720
CN601
0
4
X64
LD62
CN913
CN791
CN901
6 4
2
CN902
CN851 CN852
MF61
21S4
1 2
2 1
2 1
1 2
1 2
3 4
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6
C65
LD63
LD64 LDB
LDB
LD61
LDE
L61
F911
SSR61
X63 X62 X61
1
6
L
N
3
N
INDOOR
UNIT (B) BLU
ORN
CN602
1 2
3
3
N
INDOOR
UNIT (C) BLU
YLW
CN603
1 2
N
BLK
BRN
GRY
BLK
BLK WHT
YLW
RED
RED
RED BRN BLU ORN YLW WHT
ORN WHT BLK BLU YLW
RED
ORN ORN RED RED
YLW
YLW
BLK
BLK
ORN
ORN
BRN
GRY
X65
X66 X67
63H2
CN552
CN553
BLK
RELAY
P.C. BOARD
WHT WHT
RED WHT
V
U W
AKL
WHT
NOISE FILTER
P.C.BOARD
RED DS61 DS62
C61
CT
61
C63 C62
++
–
+
–
+
–
-
BLKREDR
BLU
LEV A
CN792
1 2 3 4 5 6
RED BRN BLU ORN YLW WHT
LEV B
CN793
1 2 3 4 5 6
RED BRN BLU ORN YLW WHT
LEV C
CN722 CN663
63H1 RT63
CN662
1 2 3 4 5 6 7 81 2 1 23 4
RED RED BLK BLK
RT66 RT68
RT67
GRY GRY GRY GRY GRY GRY
CN661
CN705
7 6 5 4 3 2 1
CN515
1 2 3 4
4 3 2 1
CN801
CN501
TAB62 TAB63
T801
CT62
TAB66
TAB65
TAB64
I.P.M P.C. BOARD
F801
(1A)
CN704
CN514
CN554CN551
1 2 3 4 5 6 7 8
RT62
RT61
RT65
GRY GRY BLK BLK GRY GRY
ELECTRONIC CONTROL P.C. BOARD
MC
PE
(1A)
TO INDOOR UNIT CONNECTING 12V
SYMBOL
C61
C62,63
C65
CT61,62
DS61
DS62
F801
F911
L
L61
SYMBOL
LEV A~C
MC
MF61
R
RT61
RT62
RT63
RT65
RT66,67
RT68
NAME
POWER FACTOR CAPACITOR
SMOOTHING CAPACITOR
OUTDOOR FAN CAPACITOR
CURRENT TRANSFORMER
DIODE MODULE
DIODE STACK
FUSE (1A)
FUSE (1A)
REACTOR
COMMON MODE CHOKE COIL
NAME
EXPANSION VALVE
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
SYMBOL
SSR61
T801
TB1,2,3,4,5
X61,62,63
X64,65
X66,67
21S4
63H1
63H2
NAME
SOLENOID COIL RELAY
TRANSFORMER
TERMINAL BLOCK
FAN MOTOR RELAY
RELAY
RELAY
R.V. COIL
HIGH PRESSURE SWITCH
HIGH PRESSURE SWITCH
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
MODELS MXZ-24UV- E1
OUTDOOR UNIT
SG79A845H01
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10
REFRIGERANT SYSTEM DIAGRAM
8
Unit:mm
MXZ-24UV -E1
Ball valve with
service port
Muffler
Ball valve with
service port
Distributor
Strainer
Strainer
LEV
Oil
separator
Compressor
High pressure
switch 1
Accumulator
Capillary tube
Reversing valve
Discharge
temperature
thermistor
Evaporation
temperature
thermistor
(RT67)
Defrost
thermistor
Strainer Distributor
Outdoor
heat
exchanger
High pressure
switch 2
Indoor unit
C
Unit C gas pipe temperature thermistor
[9.52
[6
Indoor unit
B
Unit B gas pipe temperature
thermistor [12
Indoor unit
A
Indoor unit
A
Strainer LEV [6
Indoor unit
B
Strainer LEV [6
Indoor unit
C
Unit A gas pipe
temperature thermistor
[12
[16 [16
[9.52
[16
Capillary tube
[2.5✕[0.6✕750
[2.5✕[0.6✕1000
Capillary tube
[4.0✕[2.4✕400
Capillary tube
Capillary tube
Capillary tube
[3.0✕[2.0✕200
[3.0✕[2.0✕200
[3.0✕[2.0✕200
Refrigerant flow in cooling
Refrigerant flow in heating
Reversing valve coil
heating ON
cooling OFF
●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.
Indoor unit
Extension pipe diameter
class Pipe diameter
Liquid 6.35(1/4) Liquid 6.35(1/4)
07/09 Gas 9.52(3/8) Gas 9.52(3/8)
Liquid 6.35(1/4) Liquid 6.35(1/4)
12 Gas 12.7(1/2) Gas 12.7(1/2)
Liquid 6.35(1/4) Liquid 6.35(1/4)
18 Gas 15.88(5/8) Gas 15.88(5/8)
Outdoor unit union diameter
For Liquid 6.35(1/4)
Indoor unit A Gas 12.7(1/2)
Liquid 6.35(1/4)
Indoor unit B Gas 12.7(1/2)
Liquid 6.35(1/4)
Indoor unit C Gas 9.52(3/8)
Unit : mm (inch)
Piping length each indoor unit (a, b, c) 25m
Total piping length (a+b+c) 50m
Height difference between units (H) 10m
Bending point for each unit 25
Total bending point 50
❋It does not matter which unit is higher.
a
b
c
Outdoor
unit
Indoor
units
H
H
H
OB287--1.qxp 10/9/01 3:29 PM Page 10

11
9
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
Rated voltage : ±10% (198 ~ 264V), 50Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature : °CWB
(2) Indoor outlet air wet-bulb temperature : °CWB
(3) Outdoor intake air dry-bulb temperature : °CDB
(4) Total input: W
(5) Indoor intake air dry-bulb temperature : °CDB
(6) Outdoor intake air wet-bulb temperature : °CWB
(7) Total input : W
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.
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
}
}
Cooling
Heating
PERFORMANCE CURVES
Wet-and dry-bulb
thermometers
Wet-and dry-bulb
thermometers
07 class
7.5
7.0
6.4
5.9
5.3
4.8
8.7
8.1
7.4
6.8
6.2
5.6
10.8
10.1
9.3
8.5
7.7
7.0
6.7
6.2
5.8
5.3
4.8
4.3
18 class 12 class 09 class
9-1.CAPACITY AND THE INPUT CURVES
32.3
29.8
27.3
24.9
22.4
19.9
17.4
14.9
38.2
35.3
32.4
29.4
26.5
23.5
20.6
17.6
25.9
23.9
21.9
19.9
17.9
15.9
13.9
11.9
27.7
25.6
23.4
21.3
19.2
17.0
14.9
12.8
07 class 09 class 12 class 18 class
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12
9-2.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.
0 50 100 150
0.5
1.0
1.5 <COOL>Capacity
Frequency Hz 0 50 100 150
0.5
1.0
1.5
2.0
Frequency
<COOL>Total input
Hz 0 50 100 150
0.5
1.0
1.5 <HEAT>Capacity
Frequency Hz 0 50 100 150
0.5
1.0
1.5
Frequency
<HEAT>Total input
Hz
0 50 100 150
0.5
1.0
1.5 <COOL>Capacity
Frequency Hz 0 50 100 150
0.5
1.0
1.5
2.0
Frequency
<COOL>Total input
Hz 0 50 100 150
0.5
1.0
1.5 <HEAT>Capacity
Frequency Hz 0 50 100 150
0.5
1.0
1.5
Frequency
<HEAT>Total input
Hz
0 50 100 150
0.5
1.0
1.5 <COOL>Capacity
Frequency Hz 0 50 100 150
0.5
1.0
1.5
2.0
Frequency
<COOL>Total input
Hz 0 50 100 150
0.5
1.0
1.5 <HEAT>Capacity
Frequency Hz 0 50 100 150
0.5
1.0
1.5
Frequency
<HEAT>Total input
Hz
0 50 100 150
0.5
1.0
1.5 <COOL>Capacity
Frequency Hz 0 50 100 150
0.5
1.0
1.5
2.0
Frequency
<COOL>Total input
Hz 0 50 100 150
0.5
1.0
1.5 <HEAT>Capacity
Frequency Hz 0 50 100 150
0.5
1.0
1.5
Frequency
<HEAT>Total input
Hz
1. 07-class unit in single operation
2. 09-class unit in single operation
3. 12-class unit in single operation
4. 18-class unit in single operation
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13
9-3.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/ff• G)
(1) COOL operation
1Both indoor and outdoor units are under the same
temperature/humidity condition.
Dry-bulb temperature(°C) Relative humidity(%)
20 50
25 60
30 70
<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 and continues for 30 minutes.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
①
➁
Indoor Outdoor
Set air flow to Hi speed.
Inverter output frequency is 36Hz.
➂
(2) HEAT operation
DB(°C) 20.0
WB(°C) 14.5 DB(°C) 2 7 15 20.0
WB(°C) 1 6 12 14.5
18 50 60 70
20 25 30 32
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Ambient temperature(:)/ Ambient humidity(%)
(:)
(%)
32Hz
(MPa•Gauge)
2 5 10 15 20 25
2
3
4
5
6
7
8
Ambient temperature(:)
36Hz
Outdoor low pressure
18 20 25 30
50 60 70 32
0
1
2
3
4
5
Ambient temperature(:)/ Ambient humidity(%)
(:)
(%)
32Hz
Outdoor unit current (A)
Outdoor unit current (A)
(kgf/F• Gauge)
8
7
6
5
4
3
2
2Air flow speed : HI
3Inverter output frequency : 32Hz
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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/ff• G)
(1) COOL operation
1Both indoor and outdoor units are under the same
temperature/humidity condition.
Dry-bulb temperature(°C) Relative humidity(%)
20 50
25 60
30 70
<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 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 : 40Hz
①
➁
Indoor Outdoor
Set air flow to Hi speed.
Inverter output frequency is 49Hz.
➂
(2) HEAT operation
DB(°C) 20.0
WB(°C) 14.5 DB(°C) 2 7 15 20.0
WB(°C) 1 6 12 14.5
18 50 60 70
20 25 30 32
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Ambient temperature(:)/ Ambient humidity(%)
(:)
(%)
40Hz
18 20 25 30
50 60 70 32
1
2
3
4
5
6
Ambient temperature(:)/ Ambient humidity(%)
(:)
(%)
40Hz
2 5 10 15 20 25
4
5
6
7
8
9
10
Ambient temperature(:)
49Hz
(MPa•Gauge)
Outdoor low pressure
Outdoor unit current (A)
Outdoor unit current (A)
(kgf/F• Gauge)
8
7
6
5
4
3
2
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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/ff• G)
(1) COOL operation
1Both indoor and outdoor units are under the same
temperature/humidity condition.
Dry-bulb temperature(°C) Relative humidity(%)
20 50
25 60
30 70
<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 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 : 46Hz
①
➁
Indoor Outdoor
Set air flow to Hi speed.
Inverter output frequency is 65Hz.
➂
(2) HEAT operation
DB(°C) 20.0
WB(°C) 14.5 DB(°C) 2 7 15 20.0
WB(°C) 1 6 12 14.5
18 50 60 70
20 25 30 32
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Ambient temperature(:)/ Ambient humidity(%)
(:)
(%)
46Hz
2 5 10 15 20 25
7
8
9
10
11
12
13
14
15
Ambient temperature(:)
65Hz
18 20 25 30
50 60 70 32
3
4
5
6
7
8
9
Ambient temperature(:)/ Ambient humidity(%)
(:)
(%)
46Hz
(MPa•Gauge)
Outdoor low pressure
Outdoor unit current (A)
Outdoor unit current (A)
(kgf/F• Gauge)
8
7
6
5
4
3
2
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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/ff• G)
(1) COOL operation
①
➁
Both indoor and outdoor units are under the same
temperature/humidity condition.
Dry-bulb temperature(°C) Relative humidity(%)
20 50
25 60
30 70
<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.
5.To cancel this operation,press emergency run ON/OFF button
or any button on remote controller.
Air flow speed : HI
Inverter output frequency : 73Hz
➂
①
➁
Indoor Outdoor
Set air flow to Hi speed.
Inverter output frequency is 80Hz.
➂
(2) HEAT operation
DB(°C) 20.0
WB(°C) 14.5 DB(°C) 2 7 15 20.0
WB(°C) 1 6 12 14.5
18 50 60 70
20 25 30 32
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Ambient temperature(:)/ Ambient humidity(%)
(:)
(%)
73Hz
2 5 10 15 20 25
8
9
10
11
12
13
14
15
Ambient temperature(:)
80Hz
18 20 25 30
50 60 70 32
5
6
7
8
9
10
11
Ambient temperature(:)/ Ambient humidity(%)
(:)
(%)
73Hz
(MPa•Gauge)
Outdoor low pressure
Outdoor unit current (A)
Outdoor unit current (A)
(kgf/F• Gauge)
8
7
6
5
4
3
2
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17
MICROPROCESSOR CONTROL
10
Compressor
power
factor
Indoor unit
microprocessor
SSR61 Drive
circuit
Transistor
module
Indoor Unit
A
Indoor Unit
C
Indoor Unit
BGas pipe
temperature
thermistor
RT66, 67, 68
Muffler
Accumulator
Comp.
H.P.S 63H2 Discharge
temperature
thermistor
RT61
Indoor Unit
AEvaporation
temperature
thermistor
RT63 Outdoor
fan motor
MF61
x 61
x 62
x 63
Defrost
thermistor
RT62
LEV1
LEV2
LEV3
Indoor Unit
B
Indoor Unit
C
Outdoor unit control microprocessor
Compressor
primary
current
Compressor
secondary
current
Fin temperature
thermistor RT65
R. V. coil
21S4
H.P.S 63H1
Input signal
Output signal
MXZ-24UV -E1
INVERTER MULTI SYSTEM CONTROL
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18
Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each 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
Determination of LEV standard opening in each indoor unit
When outdoor unit is operating,
some indoor unit stops and
some operates.
• LEV opening for each indoor unit is determined by adding adjustment in accordance
with the number of operating unit and the capacity class to standard opening, based
on the operation frequency:
Ex.) Opening 130 pulse in standard opening 1 ➝Minimum 80 pulse, Maximum 205
pulse. (Capacity code 4 at 1 unit operation) (Capacity code 1 at 4 unit operation)
• After starting operation, adjustment in accordance with intake super heat, discharge
temperature is included in standard opening. w1
Note: LEV opening in each frequency at DRY operation and COOL operation is the
same. However, velocity and compressor operation frequency controls are
different. See 10-2 Operational frequency range
(As far as the indoor unit velocity control goes, refer to DRY operation in
MICROPROCESSOR CONTROL in the indoor unit service manual.)
• LEV opening for each indoor unit is determined by adding adjustment in accordance
with the number of operating unit and the capacity class to standard opening, based
on the operation frequency:
Ex.) Opening 120 pulse in standard opening 1 ➝Minimum 70 pulse, Maximum 165
pulse. (Capacity code 4 at 1 unit operation) (Capacity code 1 at 4 unit operation)
• After starting operation, opening becomes the one that adjustment in accordance
with discharge temperature was added to basic opening. w1
Thermostat ON in HEAT mode
LEV opening
Thermostat OFF in
COOL or DRY mode
Thermostat OFF in HEAT mode
Stop of all indoor unit
Indoor unit status
COOL : 5 pulse (full closed)
HEAT : 59 pulse (slightly opened)
Thermostat ON in
COOL or DRY mode
Opening before stop ➝ 500 pulse in 15 minutes
When the outdoor unit operation (When the other indoor unit operate): 5 pulse.
When outdoor unit stops. (When the other indoor unit stops or thermo off):
Maintain LEV opening before stop ➝500 pulse in 15 minutes
• When the outdoor unit operates. (When the other indoor unit operates): 59 pulse
• When the outdoor unit stops. (When the other indoor unit stops or thermo off):
Maintain LEV opening before stop ➝500 pulse in 15 minutes.
w1 LEV opening when the outdoor unit operating: Upper limit 500, Lower limit 59
7 20 40 60 80 100 120 140
Operation frequency of compressor (Hz) : F
120
130
140
150
160
170
180
190
200
210
220
LEV opening (Pulse)
Standard opening
1 2 3 4 5 6 7 8
COOL
HEAT
10-1.LEV control
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19
(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
(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.
1Calculate each super heat of the unit from the expression below;
(Super heat) = (Gas pipe temperature thermistor) - (Evaporation temperature thermistor)
2Select a minimum super heat from among them.
3Correct an each LEV is corrected opening is corrected by difference between each super heat and minimum super
heat.
Suction superheat (S.H.) LEV opening
correction (pulse)
more than 12
10 to12
8 to 10
6 to 8
6 or less
6
4
3
2
0
Difference of
superheat LEV opening correction (pulse)
more than 9
6 to9
3to 6
6 or less
8
6
2
0
1Suction super heat
(MIN gas pipe temperature thermistor - Evaporation temperature thermistor)
2Each correction w1
• (Each gas pipe temperature thermistor - Evaporation temperature thermistor)
• (Main pipe temperature thermistor - sub pipe temperature thermistor)
w1 Perform this, when number of operation units is 2units or more
w2 When the correction opening of suction super heat is 0, correct the LEV opening by dischaege temperature.
3Discharge temperature
COOL DRY HEAT
• •
-
•
w2
•
w2
•
<Correction>
432 Code4Code3Code2
Standard opening Difference in
capacity Difference in operation number
1 2 3 4 5 6 7 8
COOL
HEAT 130 120 130 130 130 140 150 155
Capacity code
Indoor unit 1 07 2 09 3 12 4 18
170
170 180 185 180 200 190 215 25 15 50 30 75 45 -30 -10 -40 -40 -50 -50
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20
10-2.Operational frequency range
(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.
Operation frequency
of compressor
Minimum ~ 20
21 ~ 30
31 ~ 40
41 ~ 55
56 ~ 70
71 ~ 90
91 ~ maximum
Single
51
57
65
67
70
72
74
Double
60
64
68
72
77
83
84
Triple
62
66
73
79
86
90
90
Quadruple
64
68
75
81
88
90
90
Single
55
58
63
70
80
85
85
Double
49
52
55
58
63
69
74
Triple
48
51
54
57
62
68
73
Quadruple
47
50
53
56
61
67
72
Number of operating unit. Number of operating unit.
COOL, DRY HEAT
Discharge temperature (;)LEV opening
correction (pulse)
more than Target discharge temperature+11
Target discharge temperature+11 to Target discharge temperature+8
Target discharge temperature+8 to Target discharge temperature+5
Target discharge temperature+5 to Target discharge temperature+2
Target discharge temperature+2 to Target discharge temperature-2
Target discharge temperature-2 to Target discharge temperature-5
Target discharge temperature-5 to Target discharge temperature-8
Target discharge temperature-8 to Target discharge temperature-11
Target discharge temperature-11 or less
COOL
10
4
2
1
0
-1
-2
-5
-8
HEAT
7
6
3
2
0
-1
-1
-3
-7
Min. Max. Rated Min. Max. Rated
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.
DRY COOL
COOL DRY HEAT
Number of
operating
unit
1
2
3
4
2
3
4
5
6
7
8
3
4
5
6
7
8
9
18
20
30
40
52
68
85
80
105
110
115
32
40
46
73
70
80
90
71
18
22
26
62
70
80
86
95
105
115
120
36
49
65
80
80
88
100
102
1
2
3
25
40
58
1
2
1
1
2
3
1
2
2
3
1
1
8/10 of maximum frequency
9/10 of maximum frequency
7/10 of maximum frequency
Maximum frequency
capacity
cord
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