Mitsubishi Electric MXZ-18TV User manual

SERVICE MANUAL
SPLIT-TYPE,HEAT PUMP AIR CONDITIONER
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························3
4. INDOOR UNITS COMBINATION·······················3
5. SPECIFICATION·················································4
6. NOISE CRITERIA CURVES······························ 5
7. OUTLINES AND DIMENSIONS ························ 6
8. WIRING DIAGRAM ············································7
9. REFRIGERANT SYSTEM DIAGRAM················8
10. PERFORMANCE CURVES································9
11. MICROPROCESSOR CONTROL·····················14
12. TROUBLESHOOTING······································19
13. DISASSEMBLY INSTRUCTIONS·····················29
14. PARTS LIST······················································32
15. OPTIONAL PARTS···········································34
Inverter-controlled multi system
Model
MXZ-18TV - E1
No. OB280
This manual describes technical data of outdoor unit.
For the indoor unit refer to the service manuals No. OB229, OB227 REVISED EDITION-B, OB252 REVISED EDI-
TION-A, and OC165 of corresponding models.
Model indication
OB280-1.qxp 01.4.4 2:40 PM Page 1

PART NAMES AND FUNCTIONS
2
OUTDOOR UNIT Air inlet
Air outlet
(back and side)
Model indication
MXZ-18TV- E1
2
TECHNICAL CHANGES
1
MXZ-18RV - ➔MXZ-18TV -
1. The combination pattern of indoor unit has increased.
2. Outside dimension of the outdoor equipment changed.
3. Ball valve has changed to stop valve.
4. Accumulator has been removed.
5. Hight pressure switch has been removed.
6. Compressor has changed.
7. Refrigerant filling capacity has changed. (1.3kg ➝1.55kg)
E1E1
OB280-1.qxp 01.4.4 2:40 PM Page 2

3
3INDOOR / OUTDOOR CORRESPONDENCE TABLE
❈There is no combination other than this table.
MXZ-18TV- E1
OUTDOOR UNIT
Combination of the
connectable indoor units
07+09
07+12
07+SEH-1.6
09+09
09+12
09+SEH-1.6
12+12
INDOOR UNITS COMBINATION
4
07
09
12
07+09
07+12
09+09
09+12
12+12
90
90
90
90
90
90
90
90
3.88
4.17
6.22
8.79
8.85
8.88
9.00
9.07
2.3
(0.9-2.8)
2.5
(0.9-3.0)
3.4
(0.9-3.8)
4.8
(1.49-5.25)
5.0
(1.51-5.45)
5.0
(1.51-5.45)
5.2
(1.53-5.60)
5.3
(1.55-5.70)
0.850
(0.225-1.055)
0.865
(0.225-1.125)
1.29
(0.220-1.550)
1.82
(0.370-2.11)
1.835
(0.365-2.125)
1.840
(0.370-2.130)
1.865
(0.365-2.145)
1.88
(0.370-2.190)
–
–
–
2.5
2.98
2.5
3.0
2.65
2.3
2.5
3.4
2.3
2.02
2.5
2.2
2.65
Indoor units
combination Unit A Unit B
Cooling capacity (kw)
Total Outdoor unit
power consumption
(kw)
Current
(A) Power factor
(%)
230V
NOTE: Electrical data is for outdoor unit only.
MXZ-18TV - E1
NOTE: SEH-1.6AR is equivalent to class 12 (12000BTU).
However, the combination of “12+12” has only the MSC type.
NOTE: Electrical data is for outdoor unit only.
07
09
12
07+09
07+12
09+09
09+12
12+12
90
90
90
90
90
90
90
90
4.85
5.23
6.95
9.27
9.14
9.17
8.81
8.64
3.3
(0.9-4.0)
3.6
(0.9-4.5)
4.0
(0.9-4.7)
6.2
(1.53-6.70)
6.5
(1.55-7.00)
6.5
(1.55-7.0)
6.55
(1.56-7.1)
6.6
(1.58-7.2)
1.005
(0.225-1.115)
1.085
(0.225-1.195)
1.440
(0.220-1.490)
1.92
(0.300-2.030)
1.895
(0.295-2.005)
1.900
(0.300-2.010)
1.825
(0.295-1.925)
1.790
(0.290-1.840)
–
–
–
3.23
3.88
3.25
3.77
3.30
3.3
3.6
4.0
2.97
2.62
3.25
2.78
3.30
Indoor units
combination Unit A Unit B
Heating capacity (kw)
Total Outdoor unit
power consumption
(kw)
Current
(A) Power factor
(%)
230V
OB280-1.qxp 01.4.4 2:40 PM Page 3

4
5SPECIFICATION
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 (Hi)
Fan speed (Hi)
Fan speed regulator
Refrigerant filling
capacity(R-22)
Refrigerating oil (Model)
Thermistor RT61
Thermistor RT62
Thermistor RT63
Thermistor RT65,66
Thermistor RT67
m
m
m
m
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"
Compressor Electrical
data
Fan motor
Special remarks
Capacity System
Coefficient of performance(C.O.P)
Outdoor unit power supply
MXZ-18TV - E1
Single phase
230V,50Hz
2
Total model name 24
Total model name 24
Max. 30 (chargeless 20)
Max. 20
10
10
1,860
20
—
—
90.0
9.08
0.38
SHV-130FEA (ROTARY)
1,400
U-V 0.45
V-W 0.45 W-U 0.45
RA6V35-AA
WHT-BLK 236.2 BLK-YLW 48.1
BLK-RED 224.1
800(+69)o600o300
46
630
2
1.55
350 (MS-56)
13.4 (at 100:)
10.0 (at 25:)
10.0 (at 25:)
10.0 (at 25:)
17.0 (at 50:)
Cooling
5.3 (1.55~5.7)
—
9.08
1,880 (370~2,190)
8.70
2.82
48
Heating
6.6 (1.58~7.2)
—
8.64
1,790 (290~1,840)
8.26
3.69
49
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 ISO 5151 (Refrigerant piping length (one way) :5m
✽1 Electrical data is for only outdoor unit.
OB280-1.qxp 01.4.4 2:40 PM Page 4

5
NOISE CRITERIA CURVES6
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:
Cooling
NOTCH
Heating
48
SPL(dB(A))
49
LINE
MXZ-18TV - E1
OB280-1.qxp 01.4.4 2:40 PM Page 5

6
OUTLINES AND DIMENSIONS
7
MXZ-18TV -E1
Unit: mm
OUTDOOR UNIT
23 16 69
800
500
400
45.4 40
165
347.5
Air in
Air out
Air in
Drainage hole {33
Drainage
hole {33
113
300
152
155
43.6
34 17
90 65 65 65
34 17300
330
600
Handle Handle Liquid refrigerant pipe joint
Refrigerant pipe (flared) {6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) {9.52
Service
port
Bolt pitch for installation
100mm or more
100mm or more
200mm or more
350mm or more
However, either the
left / right sides or
back side should
be unobstructed.
Basically unobstructed
Even if the right / left sides or
back side are vacant, the top
has to be at least 100mm
unobstructed. WA
WA
WB
WA In case of poorly-ventilated place, the front
or the back has to be at least 200mm
unobstructed.
WB The wall may get dirty in case the air is
discharged toward it.
REQUIRED SPACE
OB280-1.qxp 01.4.4 2:40 PM Page 6

7
WIRING DIAGRAM
8
R61
IPM
FUSE(1A)
T801
CT62
WVU
TAB61
TAB65
C65
SSR61
CN664 CN663 CN661
66
MF61
CN912CN911
21S4
CN61
R62
TAB62
V
W
UMC
BLK
WHT
RED RED
WHT
BLK
PE
F911(1A)
BLU
ORN
YLW
TB2
BLK
BREAKER
GRN/YLW
CIRCUIT
POWER
SUPPLY
~/N
230V~
50Hz
TB1
TO INDOOR
UNIT No.B
CONNECTING
12V
TO INDOOR
UNIT No.A
CONNECTING
12V
N
L
N
3
N
3
GROUND
BLK
BLU
BLK BLU
GRN
RED
X62 X61
X64
R64
CT61
TAB2
TAB1
LDE
CN601CN602 CN851
TAB4
CN901
LDS62
DS61
C61 C62
7
ORN
BLU
RED
YLW
YLW
RED
4
FUSE(20A)
ELECTRONIC CONTROL
P.C. BOARD
2 1 2 16 5 4 3 2 1
RT65RT66RT61RT67
LEV ALEV B
CN772 CN771 4 3
RT62RT63
6 5 4 3 2 1 3 2 14
1 2 3
3 2 14567
1234567
123 123
NOISE FILTER
P.C.BOARD
–
++ –
–
+
–
+
NAMESYMBOLNAMESYMBOL
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.Symbols below indicate.
:Terminal block :Connector
NAMESYMBOL
NOTES:
C61
C62
C65
CT61
CT62
DS61,DS62
FUSE
FUSE
F911
IPM
L
POWER-FACTOR CAPACITOR
SMOOTHING CAPACITOR
FAN MOTOR CAPACITOR
CURRENT TRANSFORMER
CURRENT TRANSFORMER
DIODE MODULE
FUSE(20A)
FUSE(1A)
FUSE(1A)
POWER TRANSISTOR MODULE
REACTOR
R64
R61,R62
LEV A
LEV B
21S4
MC
MF61
RT61
RT62
RT63
RT65
RESISTOR
RESISTOR
EXPANSION VALVE A,COIL
EXPANSION VALVE B,COIL
REVERSING VALVE SOLENOID COIL
COMPRESSOR
FAN MOTOR
DISCHARGE TEMP. THERMISTOR
DEFROST TEMP. THERMISTOR
EVAPORATOR TEMP. THERMISTOR
GAS PIPE TEMP. A THERMISTOR
RT66
RT67
SSR61
T801
TB1
TB2
X61
X62
X64
CN61
GAS PIPE TEMP. B THERMISTOR
FIN TEMP. THERMISTOR
SOLENOID COIL RELAY
TRANSFORMER
TERMINAL BLOCK
TERMINAL BLOCK
FAN MOTOR RELAY
FAN MOTOR RELAY
RELAY
CONNECTOR
SG79J191H01
MODELS MXZ-18TV- E1
OUTDOOR UNIT
OB280-1.qxp 01.4.4 2:40 PM Page 7

8
REFRIGERANT SYSTEM DIAGRAM
9
Unit:mm
MXZ-18TV -E1
Compressor
Discharge
temperature
thermistor
R.V. coil
heating ON
cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
Muffler
Outdoor
heat
exchanger
Muffler
LEV (A)
Evaporation
temperatuer
thermistor
LEV (B)
Strainer
Strainer
Defrost
thermistor
Capillary tube
{4.0✕{2.4✕300
Capillary tube
{2.4✕{0.6✕750
Capillary tube
{3.0✕{2.0✕400
Capillary tube
{3.0✕{2.0✕400
Stop valve
(with service port) Gas pipe temperature
B thermistor
Gas pipe temperature
A thermistor
Stop valve
Stop valve
Indoor
Unit B
Indoor
Unit B
Indoor
Unit A
Indoor
Unit A
Stop valve
(with service port)
4-way valve
{8
{6
{6
{16
{12
●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)
Outdoor unit union diameter
For Liquid 6.35(1/4)
Indoor unit A Gas 9.52(3/8)
Liquid 6.35(1/4)
Indoor unit B Gas 9.52(3/8)
Unit : mm (inch)
Piping length each indoor unit (a, b) 20m
Total piping length (a+b) 30m
Height difference between units (H) 10m
Bending point for each unit 15
Total bending point 30
❋It does not matter which unit is higher.
NOTE: SEH-1.6AR is equivalent to class 12.
a
Outdoor
unit
b
H
H
H
MAX REFRIGERANT PIPING LENGTH
MXY-18TV -E1
OB280-1.qxp 01.4.4 2:40 PM Page 8

9
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, 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 10 and 11 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
7.7
7.2
6.6
6.1
5.5
5.0
9.3
8.6
7.9
7.3
6.6
6.0
8.4
7.8
7.2
6.6
6.0
5.4
12 class 09 class
10-1. CAPACITY AND THE INPUT CURVES
25.9
23.9
21.9
19.9
17.9
15.9
13.9
11.9
23.6
21.8
19.9
18.1
16.3
14.5
12.7
10.9
25.7
23.7
21.8
19.8
17.8
15.8
13.8
11.9
07 class 09 class 12 class
OB280-1.qxp 01.4.4 2:40 PM Page 9

10
10-2. Capacity and input correction by inverter output frequency
(OUTDOOR UNIT:MXZ-18TV)
NOTE 1 : Inverter output frequency : COOL 55Hz,HEAT 80Hz
NOTE 2 : 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
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
<COOL>Capacity
Frequency Hz Frequency
<COOL>Total input
Hz Hz
<HEAT>Capacity
Frequency Frequency
<HEAT>Total input
Hz
<COOL>Capacity
Frequency Hz Frequency
<COOL>Total input
Hz
<HEAT>Capacity
Frequency 0 50 100 150
0.5
1.0
1.5
Frequency
<HEAT>Total input
Hz
<COOL>Capacity
Frequency Hz Frequency
<COOL>Total input
Hz
<HEAT>Capacity
Frequency Hz
Hz
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
OB280-1.qxp 01.4.4 2:40 PM Page 10