13. PARTS LIST······················································61
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Revision:
● A number of drainage holes of MUZ-A09RV-and MUZ-A12RV-has been increased.
● Compressors of MUZ-A09RV-and MUZ-A12RV-has been changed.(SNB092FBA ➔ SNB092FJAH)
● SPECIFICATION, OUTLINES AND DIMENSIONS and PARTS LIST have been partially modified.
● Please void OB230.
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1TECHNICAL CHANGES
LubricantRefrigerant
New refrigerant
R410A
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
Not included
A1/A1
72.6
-51.4
1.557
64
Non combustible
0
1730
From liquid phase in cylinder
Possible
Incompatible oil
Non
Non
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
86.5
-40.8
0.94
44.4
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
Non
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (:)
Steam pressure [25:](Mpa)
Saturated steam density [25:](Kg/K)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
New SpecificationCurrent Specification
w1:Ozone Destruction Parameter : based on CFC-11
w2 :Global Warmth Parameter : based on CO
2
The incompatible lubricant easily separates from refrigerant
and is in the upper layer inside the suction muffler.
Raising position of the oil back hole enables to back the
lubricant of the upper layer to the compressor.
Since refrigerant and lubricant are compatible each, lubricant
backs to the compressor through the lower position oil back
hole.
Compressor
Suction muffler
Oil back hole
Lubricant
Refrigerant
Compressor
Suction muffler
Oil back hole
Lubricant /Refrigerant
Compressor
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
• This room air conditioner adopts R410A of HFC refrigerant which never destroys the ozone layer.
Pay attention following points.
1 As R410A working pressure is 1.6 times higher than that of R22 of previous refrigerant, dedicated tools and piping are
required.
2 R410A is more affected by water and contaminations than R22. Keep R410A away from water and contaminations during
storage and while installing.
3 Use clean dedicated piping materials for R410A only which are strong enough against R410A pressure. Never use any
current pipes designed for R22.
4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])
2
-30 -20 -10010 20
30
40 50 60
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
(MPa [Gauge])
R410A
R22
Conversion chart of refrigerant temperature and pressure
Saturated liquid pressure
(;)
NOTE : The unit of pressure has been changed to MPa on the
R410A toolsCan R22 tools be used?
Gas leak detector
R410A pressures beyonds the measurement range of R22
gauges. Port diameters have been changed to prevent other kinds of
refrigerant from being charged into the units.
Hose material and cap size have been changed to improve the pressure
resistance.
Dedicated for HFC refrigerant.
1/4 and 3/8 wrenches can be used for both R22 and R410A units.
Description
Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
Provided for flaring work (to be used with R22 flare tool).
Provided to prevent the back flow of oil. This adapter enables you to use
vacuum pumps.
It is difficult to measure R410A with a charging cylinder because the
refrigerant bubbles due to high pressure and high-speed vaporization
No
No
No
Yes
Yes
Newly required
Newly required
Newly required
Gauge manifold
Charge hose
Torque wrench
Flare tool
Flare gauge
Vacuum pump
adapter
Electronic scale for
refrigerant charging
No : Not Substitutable for R410A Yes : Substitutable for R410A
Wall
thickness
Outside diameter
Pipe
mminch
For liquid
For gas
6.35
9.52
1/4
3/8
0.8 mm
0.8 mm
Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
Insulation material
international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])
1.Tools dedicated for the air conditioner with R410A refrigerant
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
The diameter of the service port on the outdoor unit operation valve has been changed to prevent improper refrigerant
charging. Cap size has also been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.
2.Refrigerant piping
1 Specifications
Use the refrigerant pipes that meet the following specifications.
• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.7 mm or less, as the pressure resistance is in
sufficient.
2 Flaring work and flare nut
Flaring work for R410A pipes differs from that for the existing refrigerant pipes.
For details of flaring work, refer to Installation manual “6-1 FLARING WORK”.
Apply the special refrigeration oil (accessories) to the flare and the union seat surfaces.
4.Air purge
Use the vacuum pump for air purging for the purpose of environmental protection.
5.Additional charge
For additional charging, charge the refrigerant from liquid phase of the gas cylinder. If the refrigerant is charged from the
gas phase, composition change may occur in the refrigerant inside the cylinder and the outdoor unit. However, charging the
liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.
Gas cylinder
2
PART NAMES AND FUNCTIONS
MSZ-A09RVMSZ-A12RV-
INDOOR UNIT
Air cleaning
filter(white bellows
type)
Deodorizing filter
(gray sponge type)
Air filter
Front panel
Vertical vanes
Outdoor unit
Valve
Refrigerant gas cylinder
for R410A with siphon
Electronic scale for refrigerant charging
E1
E1
Grille
Air inlet
to Breaker
Power supply cord
Remote control
receiving section
Horizontal vane
Liquid
Operation section
(When the grille is opened)
Emergency operation switch
Remote
controller
Display section
Power monitor lamp
Receiving section
4
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF)button
OPERATION SELECT button
FAN SPEED CONTROL button
ON-TIMER button
CLOCK SET button
HR. button
MIN. button
(TIME SET button)
TEMPERATURE buttons
VANE CONTROL button
OFF-TIMER button
RESET button
ON/OFFTOO
WARM
TOO
COOL
HR.MIN.
CLOCK
RESET
CLOCK
MODE
FAN
VANE
START
STOP
ECONO COOL button
ECONO COOL
I FEEL
COOL DRY HEAT
600 1
100
AM
PM
SWING
SWING button
MUZ-A09RVMUZ-A12RV-
E1
E1
OUTDOOR UNIT
Air inlet (back and side)
Piping
Drain hose
Air outlet
Drain outlet
MSZ-A09RVMSZ-A12RV-
E1
E1
REMOTE CONTROLLER
5
3
Indoor model
Function
Power supply
Capacity
Air flow(High)
Dehumidification
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Fan motor current
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Air direction
Sound level (High)
Fan speed (High)
Fan speed regulator
RT11(at25:)
Thermistor RT12(at25:)
RT13(at25:)
Outdoor model
Outdoor air flow
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at20:)
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigerating oil (Model)
NAME
VARISTOR
ROOM TEMPERATURE
THERMISTOR
INDOOR COIL
THERMISTOR (MAIN)
INDOOR COIL
THERMISTOR (SUB)
SYMBOL
SR141
TB
52C
NAME
SOLID STATE RELAY
TERMINAL BLOCK
CONTACTOR
10
MUZ-A09RV- MUZ-A12RV- MODELS WIRING DIAGRAM
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OUTDOOR UNIT
220-240V ~
SYMBOL
CT61
C61,C62
C65
DSA61
F801
F901
IC950
IPM
LEV
L61
NOISE FILTER P.C BOARD
R65
X64
LDNF2
CT61
LD-E
GRN
DSA61
NR61
12V3
TB1
RED
WHT
2
BLU
N
FROM INDOOR UNIT
CONNECTING
TAB61
L61
TAB62
BLU
GRN/YLW
NAME
CURRENT TRANSFORMER
SMOOTHING CAPACITOR
OUTDOOR FAN CAPACITOR
SURGE ABSORBER
FUSE (2A)
FUSE (2A)
DC/DC CONVERTER
INTELLIGENT POWER MODULE
EXPANSION VALVE COIL
CMC COIL
BLU
TAB72
SSR61
CN913
21S4
L63
LDNF1
WHT
RELAY
TAB71
P.C
BOARD
F901
C65
12
ORG
SYMBOL
L63
L64
MC
MF61
NR61
PFC
RT61
RT62
RT64
R61,62
TAB68
TAB69
CN912
X61
X62
CN
WHT
BLU
CN914
3
2
911
1
654321
4
4
CN771
LD62
LD61
R61
CN779CN778
3
2
1
CN726
R62
C61
C62
IC950
TRANS
ELECTRONIC
CONTROL
BLK
RED
WHT
YLW
5
MF61
COIL
REACTOR
COMPRESSOR
OUTDOOR FAN MOTOR (INNER FUSE)
VARISTOR
POWER FACTOR CONTROL MODULE
DISCHARGE TEMPERATURE THERMIST OR
DEFROST THERMISTOR
FIN TEMPERATURE THERMIST OR
CURRENT-DETECTING RESISTOR
P.C BOARD
CN601
231
NAME
PFC
+
+
F801
R64
6
5
4
3
2
CN641
1
-
1
2
CN642
SYMBOL
R64
R65
SSR61
TB1, TB2
X61, X62
X64
21S4
6
GRY
TB2
BLK
LEV
GRY
1
2
BLK
WHT
RED
3
RED
P
N
IPM
~
~
+
U
V
W
RT64
RT61
RT62
CN724
TAB75
TAB76
LD65
LD66
LD67
V
MC
NAME
CURRENT-DETECTING RESISTOR
CURRENT-LIMITING RESISTOR
SOLID STATE RELAY
TERMINAL BLOCK
RELAY
RELAY
R.V. COIL
(COOLING TURN ON)
BLK
21
BLK
WHT
W
U
L64
NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.
Height difference should be within
5m regardless of which unit,
indoor or outdoor position is high.
w Max. Height
difference 8m
Indoor
unit
Outdoor unit
Indoor
heat
exchanger
Outdoor
heat
exchanger
Distributor
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT13(sub)
Defrost
thermistor
RT62
Discharge
thermistor
RT61
Flared connection
Stop valve
Stop valve
(with service port)
Capillary tube
Capillary tube
(2 pcs)
Refrigerant flow in cooling
Compressor
Accumulator
Maffler
Muffler
4-way valve
Refrigerant flow in heating
Refrigerant pipe [9.52
(Option)
Refrigerant pipe [6.35
(Option)
Indoor coil
thermistor
RT12(main)
Expansion
valve
[3.0o[2.0o200
[3.0o[2.0o300
REFRIGERANT SYSTEM DIAGRAM
MSZ-A09RV MSZ-A12RV -
Unit : mm
E1
E1
MUZ-A09RV MUZ-A12RV -
E1
E1
INDOOR UNIT
MAX. REFRIGERANT PIPING LENGTH
Additional piping
Model
MSZ-A09RVMSZ-A12RV-
E1
E1
MAX. HEIGHT DIFFERENCE
Max. length :mm
A
12
OUTDOOR UNIT
Piping size O.D : mm
GasLiquidIndoor unitOutdoor unit
9.526.35
Length of connecting pipe : m
Liquid: 0.5
Gas : 0.43
0
ADDITIONAL REFRIGERANT CHARGE (R410A:g)
Model
MSZ-A09RVMSZ-A12RV-
E1
E1
Outdoor unit precharged
For additional charging, charge the refrigerant from liquid phase of the gas cylinder.
If the refrigerant inside the cylinder and the outdoor unit.
However, charging the liquid refrigerant all at once may cause the compressor to be locked.
Thus, charge the refrigerant slowly.
1100
Refrigerant piping length (one way)
7m
0
12
9m8m
30
60
Calculation : Xg=30g /m✕ (A-7)m
11m10m
12090
12m
150
PERFORMANCE CURVES8
MSZ-A09RV -MUZ-A12RV MSZ-A12RV -MUZ-A12RV -
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
provided 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 ::WB
(2) Indoor discharge air wet-bulb temperature ::WB
(3) Outdoor intake air dry-bulb temperature ::DB
(4) Total input:W
(5) Indoor intake air dry-bulb temperature::DB
(6) Outdoor intake air wet-bulb temperature::WB
(7) Total input:W
Indoor air wet-bulb temperature difference on the left side of the chart on page 14 and 15 shows the difference between
the indoor intake air wet-bulb temperature and the indoor discharge air wet-bulb temperature for your reference at service.
How to measure the indoor air wet-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 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.
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Cooling
}
Heating
}
INDOOR UNIT
OUTDOOR UNIT
13
7.4
6.9
6.3
5.8
5.3
4.8
MSZ-A09RV- E1
8.5
7.9
7.3
6.7
6.1
5.5
MSZ-A12RV- E1
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Cooling capacity
MUZ-A09RV -
MUZ-A12RV -
E1
MUZ-A09RV -
E1
Correction of total input
2.0
1.5
1.0
0.5
Capacity correction factors
050100150(Hz)
The operational frequency of compressor
E1
MUZ-A12RV -
E1
Correction of total input
2.0
1.5
1.0
0.5
Capacity correction factors
050100150(Hz)
The operational frequency of compressor
14
27.1
25.1
23.0
20.9
18.8
16.7
14.6
12.5
30.4
28.1
25.8
23.4
21.1
18.7
16.4
14.1
MSZ-A12RV- E1
MSZ-A09RV- E1
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
Heating capacity
Correction of total input
Capacity correction factors
The operational frequency of compressor
050100150(Hz)
0.5
1.0
1.5
Correction of total input
Capacity correction factors
The operational frequency of compressor
050100150(Hz)
0.5
1.0
1.5
NOTE:The above curves are for the heating operation without any frost.
MUZ-A09RV -
MUZ-A12RV -
E1
E1
MUZ-A09RV -
MUZ-A12RV -
E1
E1
15
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
1832
62Hz
1520
50
25
60
30
70(%)
35(:
0.6
0.7
0.8
0.9
1.0
1.1
62Hz
6
7
8
9
10
11
12
1.2
(MPa [Gauge])
(kgf/F [Gauge])
(Reference)
220V
240V
1520
50
25
60
30
70(%)
35(:)
3
4
5
6
7
83Hz
32
18
:
1520
50
25
6030 70(%)
35(:)
1
2
3
4
5
32
18
220V
240V
53Hz
How to operate with fixed operational frequency of the compressor.
1. Press the EMERGENCY OPERATION switch on the front of the indoor unit , and select either the COOL mode or the
HEAT mode before starting to operate the air conditioner.
2. The compressor starts up.
The operational frequency of the compressor is 83Hz in the COOL mode and 58Hz in the HEAT mode.
3. The fan speed of the indoor unit is High.
4. This operation continues for 30minutes.
5. In order to release this operation, press the EMERGENCY OPERATION switch again, press any button on the remote
controller.
NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])
COOL operation
1 Both indoor and outdoor unit are under the same temperature/humidity condition.
Dry-bulb temperature
20
25
30
2 Air flow should be set at High.
3 Operational frequency : 83Hz
NOTEQ :Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB: Wet-bulb temperature
22
MICROPROCESSOR CONTROL9
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF)button
OPERATION SELECT button
FAN SPEED CONTROL button
ON-TIMER button
CLOCK SET button
HR. button
MIN. button
(TIME SET button)
TEMPERATURE buttons
VANE CONTROL button
OFF-TIMER button
RESET button
ON/OFF TOO
WARM
TOO
COOL
HR.MIN.
CLOCK
RESET
CLOCK
MODE
FAN
VANE
START
STOP
ECONO COOL button
ECONO COOL
I FEEL
COOL DRYHEAT
600 1
100
AM
PM
SWING
SWING button
GREEN SIGN
21 22 23 24 25 26 27 28 29 30
Blinking lamp shows
the room temperature
Lighting lamp shows
the set temperature
GREEN SIGN
21 22 23 24 25 26 27 28 29 30
Blinking lamp shows
the room temperature
Lighting lamp shows
the set temperature
MSZ-A09RV-MUZ-A09RVMSZ-A12RV-MUZ-A12RV-
E1E1
E1E1
Once the controls are set, the same operation mode can be repeated by simply turning the OPERATE/STOP(ON/OFF) button
ON.
Indoor unit receives the signal with a beep tone.
When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart for
3 minutes.
WIRELESS REMOTE CONTROLLER
INDOOR UNIT DISPLAY SECTION
GREEN SIGN
GREEN SIGN shows the current room temperature and set temperature.
The room temperature indicated on the temperature monitor lamp may not be exactly the same as the actual room
temperature.
Available the set temperature range is 16:~31:, however, indication range of temperature monitor lamp is 21:~30:.
The set temperature (lighting) and room temperature (blinking) are displayed.
1.
When the room temperature or set temperature is out of the indication range
If the set temperature is lower than 21:, indicating lamp at 21: is lighting. And if the room temperature is lower
than 21:, indicating lamp at 21: is blinking.
If the set temperature is higher than 30:, indicating lamp at 30: is lighting. And if the room temperature is higher
than 30:, indicating lamp at 30: is blinking.
(Example) When the set temperature is 28:, indicating lamp at 28:
2.When the room temperature or set temperature is within the indication range
(Example) When the set temperature is 26:, indicating lamp at 26:
is lighting.
When the room temperature is 30: or higher, indicating
lamp at 30: is blinking.
is lighting.
When the room temperature is 27.5: or higher and lower
than 28.5:, indicating lamp at 28: is blinking.
w When the set temperature and room temperature are the same, corresponding indicating lamp is lighting.
NOTE:
When the unit is not operating : Both POWER MONITOR lamp and green sign lamps are off.
When ON- Timer is set : POWER MONITOR lamp is on. All green sign lamps are off.
When OFF- Timer is set : The lamp indication is as same as ordinary operation.
23
Model
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
HEAT mode of
"I FEEL CONTROL"
Initial room temperatureInitial set temperature
26:
26: or more
26: or less
23: or less
23: to 25:
24:
Initial room temperatureminus 2:
Initial room temperatureminus 2:
❈1
9-1. “I FEEL CONTROL” () OPERATION
Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
HEAT mode of
"I FEEL CONTROL"
Initial room temperature
more than 25:
23: to 25:
less than 23:
1. Press OPERATE/STOP(ON/OFF) button on the remote controller. POWER MONITOR lamp of the indoor unit will turn
on with a beep tone.
2. Press OPERATION SELECT button to set “I FEEL CONTROL”() Then a beep tone is heard.
3. The operation mode is determined by the room temperature at start-up of the operation.
● Once the mode is fixed, the mode will not change by room temperature afterwards.
● Under the ON-TIMER () operation, mode is determined according to the room temperature as the operation
starts.
● When the system is stopped with the OPERATE/STOP(ON/OFF) button on the remote controller, and restarted within 2
hours in “I FEEL CONTROL” () mode, the system operates in previous mode automatically regardless of the room
temperature.
Example
Previous operation
COOL mode of
Restart
COOL mode of “I FEEL
CONTROL”
“I FEEL CONTROL”
When the system is restarted after 2 hours, the operation mode is determined by the initial room temperature at start-up
of the operation.
Example
Previous operation COOL mode of
“I FEEL CONTROL”
or COOL mode
Restart
COOL or DRY or HEAT
mode of “I FEEL CONTROL”
that determined by room
temperature start-up of the
operation.
4. The initial set temperature is decided by the initial room temperature.
❈1 When the system is restarted with the remote controller, the system operates with the previous set temperature regard-
less of the room temperature at restart.
The set temperature is calculated by the previous set temperature.
24
5. TEMPERATURE buttons
In “I FEEL CONTROL” (h)mode, set temperature is decided by the microprocessor based on the room temperature.
In addition, set temperature is controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm.
Pressing the TOO WARM or TOO COOL button emits a beep tone.
● Fuzzy control
When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering
the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat or
cold. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.
In DRY mode of “I FEEL CONTROL”, the set temperature doesn’t change.
▼ TOO
COOL… To raise the set temperature 1 ~ 2 degrees (: )
▲ TOO
WARM … To lower the set temperature 1 ~ 2 degrees (:)
9-1-1. Cool mode of “I FEEL CONTROL”
1. Following are the fan speed in AUTO.
Temperature difference
Fan speed
Difference between room
temperature and set temperature during operation.
Room temperature minus set temperature: 2 degrees or more·································High
Room temperature minus set temperature:
Room temperature minus set temperature: less than 1 degree·································Low
2. Time control
1 degree or more and less than 2 degrees ··········Med.
1 deg.
2 deg.
1.5 deg.
When the three conditions below have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes.
(1).Compressor has been continuously operating.
(2).Indoor fan speed is Low or Med.
(3).Room temperature is below 26:.
When compressor turns off half way,.the accumulated time is cancelled.
When compressor turns on again, time counting starts from the beginning.
When the indoor fan speed becomes High or the room temperature exceeds 26:, time counting stops temporarily.
After, when the above conditions are satisfied again, time counting restarts.
The indoor fan operates at set speed.
3. Coil frost prevention mode
The operational frequency of the compressor is controlled based on the temperature of the indoor coil thermistor(RT12).
Temperature of indoor coil thermistor:Th
approx. 8°C or above
approx. 6°C to 8°C
approx. 3°C to 6°C
Operation frequency
normal
fixed
lower at the rate of 3Hz/min
lower at the rate of 6Hz/min
approx. 3°C or below
Compressor is turned OFF for 5 minutes when temperature of indoor
coil thermistor continues approx. 3°C or below for 5 minutes or more.
4 deg.
• The indoor fan maintains the actual speed of the moment.
9-1-2. DRY mode of “I FEEL CONTROL”
The system for dry operation uses the same refrigerant circuit as the cooling circuit.
The compressor and the indoor fan are controlled by the temperature.
By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature
decrease.
The operation of the compressor and indoor fan is as follows.
Compressor operates by temperature control and time control.
1 Set temperature is controlled to fall 2°C as initial set temperature.
2 Indoor fan and outdoor fan operate in the same cycle as the compressor.
3 Operational frequency control of compressor is fixed 30Hz.
NOTE ● Coil frost prevention during DRY mode of “I FEEL CONTROL”
The operation is same as coil frost prevention during COOL mode of “I FEEL CONTROL” .
25
Defrosting in DRY mode
Released
Cold Air Prevention
18:RT1222:
Fan speed
Set speed
Very Low or stop
<Time condition>
<Indoor fan speed>
less than 2 minutes Low
2 minutes to 4 minutes Med.
more than 4 minutes High
Compressor
OFF
ON
Fan
Very Low
Set speed
The operational frequency of the compressor is controlled based on the temperature of the indoor coil thermistor (RT12).
Temperature of indoor coil thermistor:RT12
approx. 8°C or above
approx. 6°C to 8°C
approx. 3°C to 6°C
Operation frequency
normal
fixed
lower at the rate of 3Hz/min
lower at the rate of 6Hz/min
approx. 3°C or below
Compressor is turned OFF for 5 minutes when temperature of indoor
coil thermistor continues approx. 3°C or below for 5 minutes or more.
The indoor fan maintains the actual speed of the moment. However, it changes to Low speed when the compressor stops.
9-1-3. HEAT mode of “I FEEL CONTROL”
1. Indoor fan speed control
(1) Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto the fan speed is as follows.
Set temperature minus room temperature: 2 degrees or more················································· High
Initial temperature difference
Set temperature minus room temperature: Between 1 and 2 degrees····································· Med.
Set temperature minus room temperature: less than 1 degree················································· Low
(2) Cold air prevention control
1 When the compressor is not operating,
(1) if the temperature of indoor coil thermistor RT12 is 18°C or less, the fan stops.
(2) if the temperature of indoor coil thermistor RT12 is more than 18°C, the fan operates at Very Low.
2 When the compressor is operating,
(1) if the temperature of RT12 is 22°C or more, the fan operates at set speed.
(2) if the temperature of RT12 is less than 22°C and
(1) if the temperature of room temperature thermistor RT11 is 15°C or less, the fan stops.
(2) if the temperature of room temperature thermistor RT11 is more than 15°C, the fan operates at Very Low.
Fan speed
Difference between room
temperature and set temperature during operation
2 deg.
1 deg.
1.7 deg.
4 deg.
NOTE : At initial and after defrosting, when the RT12 is from 18: to 22:, Cold Air Prevention control works.
(3) Warm air control.
When the following any condition of 1(a. ~ d.) and the condition of 2 are satisfied at the same time, warm air control
works.
1 a.) when the operation mode has been changed to HEAT mode
b.) when cold air prevention has been released
c.) when defrosting has been finished
d.) when the compressor starts in HEAT mode
2 When the temperature of indoor coil thermistor RT12 is less than 37°C.
When warm air control works, the fan speed changes as follows to blow out warm air gradually.
Gradation of fan speed in initial
The upper limit of the fan speed in MANUAL is the set speed.
The upper limit of the fan speed in AUTO is the speed decided by indoor fan speed control.
When the temperature of RT12 has been 37°C or more, or when the set speed has been changed, this control is
released and the fan speed is the set speed.
(4) Flow soft control
When the thermostat (compressor) is off, the indoor fan operates as follows.
NOTE : When the thermostat(compressor) turns on, the fan will operate
at set speed. But until cold air prevention and warm air control
is released.
26
2. High pressure protection
Normal
Indoor fan
Compressor normal
Outdoor fan moter
4-way valve
ONON
OFF
OFF
100Hz
Horizontal
Normal
Vertical vanes
Normal
Normal
Normal
Very Low (temperature of indoor coil thermistor > 18:)
30
seconds
30
seconds
30
seconds1second
5 seconds
1
second
1
second
STOP
5
seconds
MAX Hz
MAX Hz
In HEAT mode and manually-operated HEAT mode, the indoor coil thermistor detects the temperature at the indoor heat
exchanger and controls the compressor rotational frequency to prevent the condensing pressure from increasing excessive-
ly.
3. Overload starting
When the room temperature thermistor reads 18°C or above, the compressor runs with its maximum frequency regulated for
3 minutes after the start-up.
4. Defrosting in HEAT mode
(1) Starting conditions of defrosting
a) The defrost thermistor attached to the outdoor heat exchanger read -3°C or below.
b) The cumulative operation time of the compressor has reached any of the set values: 30, 40, 45, 55, 65, 75, 85, 95, 105,
115 minutes.
c) More than 5 minutes have passed since the start-up of the compressor.
When the above three conditions, a), b), and c), are satisfied, the defrosting starts.
wSet value of compressor operation time(hereinafter referred to as defrost interval)
The first defrost interval is 40 minutes long, and the second 45 minutes long.The third and subsequent intervals are set to
be longer, and less frequent, depending on defrosting time.
The third and subsequent defrost intervals follow any of the three patterns …5 or 10 minutes longer, the same, or 5 or 10
minutes shorter compared with the previous defrost interval … with the longest 115 minutes and the shortest 30 minutes.
(2) Releasing conditions of defrosting
Defrosting is released when any of the following condition is satisfied:
a) The defrost thermistor reads 13°C or above.
b) Defrosting time has exceeded 10 minutes.
c) Some other mode than HEAT mode is set during defrosting.
Time chart of defrosting in HEAT mode (reverse type)
<outdoor unit>
27
9-2. COOL () OPERATION
35
30
25
20
15
10
:
10 15 20 25 30 35
Set temperature
Initial room temperature
Set temperature and
initial room temperature in dry mode
:
Med.
High
High
Low
(1) Press OPERATE/STOP(ON/OFF) button.POWER MONITOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with the OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature.
The setting range is 16 ~ 31°C
✻ Indoor fan continues to operate regardless of thermostat’s OFF-ON.
✻ Coil frost prevention is same as COOL mode of “I FEEL CONTROL”.
9-3. DRY () OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
POWER MONITOR lamp of the indoor unit turns on with a beep
tone.
(2) Select DRY mode with the OPERATION SELECT button.
(3) The microprocessor reads the room temperature and determines
the set temperature. Set temperature is as shown on the right
chart.
(4) DRY operation will not work when the room temperature is
13°C or below.
9-4. HEAT () OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
POWER MONITOR lamp of the indoor unit turns on with a beep
tone.
(2) Select HEAT mode with the OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31°C.
9-5. FAN MOTOR CONTROL
1. Rotational frequency feedback control
The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency
(High,Med.,Low) the microprocessor controls SR141 and adjusts fan motor electric current to make the current rotational
frequency close to the target rotational frequency. With this control, when the fan speed is switched, the rotational frequency changes smoothly.
2. Fan motor lock-up protection
When the rotational frequency feedback signal is not output for 12 seconds, (or when the microprocessor cannot detect
the signal for 12 seconds) the fan motor is regarded locked-up. Then the electric current to the fan motor is shut off. 3
minutes later, the electric current is applied to the fan motor again. During the fan motor lock-up, the POWER MONITOR
lamp flashes to show the fan motor abnormality. (See page 42.)
28
9-6. AUTO VANE OPERATION
1. Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the
motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor.
2. The horizontal vane angle and mode changes as follows by pressing the VANE CONTROL button.
3. Positioning
The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle.
The positioning is decided as follows.
(a) When the OPERATE / STOP(ON / OFF) button is pressed.(POWER ON/OFF)
(b) When the vane control is changed AUTO to MANUAL.
(c) When the SWING is finished.
(d) When the test run starts.
(e) When the power supply turns ON.
4. VANE AUTO () mode
In VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimum
room-temperature distribution.
(1) In COOL and DRY operation
Vane angle is fixed to Angle 1.
(2) In HEAT operation
Vane angle is fixed to Angle 4.
5. Dew prevention
During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
6 SWING MODE ()
By pressing the SWING button, vane swings horizontally. The remote controller displays “”.
SWING MODE is cancelled when any of the following operations are performed.
● The unit is turned off.
The vertical vanes will return to their positions just before the swing operation was started.
● The operation mode(AUTO, COOL, DRY or HEAT)is changed.
The vertical vanes will return to their positions just before the swing operation was started.
● The SWING button is pressed.
The vertical vanes stop at the position when the button is pressed.
29
COOL and DRY
HEAT
About 100-
About 150-
Horizontal AIR FLOW blowing range
7 Horizontal AIR FLOW ()
Horizontal vane
Set position
Angle 1
28:24:
Released
Cold Air Prevention
The vertical vane angle changes as follows by pressing the SWING button.
● Press the SWING button.
The vertical vanes begin moving.
● When the vertical vanes move to the desired position, press the SWING button again.
The vertical vanes stop moving.
NOTE
If the SWING button is not pressed again within 30 seconds in COOL or DRY mode or within 1 minute in HEAT mode
after the vertical vanes start moving, the vertical vanes will automatically return to their original positions.
8. Cold air prevention in HEAT operation.
When any of the following conditions occurs in HEAT operation,
the vane angle changes to Angle 1 automatically to prevent cold
air blowing on users.
Indoor coil thermistor RT12 temperature
① Compressor is not operating.
➁ Defrosting is performed.
➂ Indoor coil thermistor RT12 reads 24: or below.
➃ Indoor coil thermistor RT12 temperature is raising from 24°C or
below, but it does not exceed 28:.
NOTE: If the temperature of RT12 reads from 24: to 28: at the air conditioner starting, this control works.
9. ECONO COOL () operation (ECONOmical operation)
When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher than that in
COOL mode.
Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(RT12).
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that in
COOL mode, the air conditioner can keep comfort. As a result, energy can be saved.
ECONO COOL operation is cancelled when the ECONO COOL button is pressed once again or VANE CONTROL button is
pressed or change to other operation mode.
NOTE : ECONO COOL operation not work in COOL mode of “I FEEL CONTROL”.
SWING operation
In swing operation of ECONO COOL mode, the initial air flow direction is adjusted to “Horizontal”.
According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is
decided. Then when the downward blow has been finished, next horizontal blow time is decided.
For initial 10 minutes the swing operation is performed in table G~H for quick cooling.
Also, after 10 minutes when the difference of set temperature and room temperature is more than 2:, the swing operation
is performed in table D~H for more cooling.
The air conditioner repeats the swing operation in various cycle as follows.
Temperature of indoor
coil thermistor RT12
A
B
C
D
E
F
G
H
15°C or less
15°C to 17°C
17°C to 18°C
18°C to 20°C
20°C to 21°C
21°C to 22°C
22°C to 24°C
more than 24°C
Downward blow time
(sec.)
2
5
8
11
14
17
20
23
30
Horizontal blow time
(sec.)
23
20
17
14
11
8
5
2
9-7. TIMER OPERATION
1. How to set the timer
(1) Press OPERATE/STOP(ON/OFF) button to start the air conditioner.
(2) Check that the current time is set correctly.
NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display
of TIME MONITOR, so set the current time correctly with CLOCK SET button.
(3) Press ON or OFF TIMER buttons to select the operation.
“” button... AUTO START operation (ON timer)
“” button... AUTO STOP operation (OFF timer)
(4) Press HR. and MIN. button to set the timer. Time setting is 10-minute units.
HR. and MIN. button will work when “” or “” mark is flashing.
These marks disappear in 1 minute.
After setting the ON timer, check that POWER MONITOR lamp of the indoor unit lights.
NOTE1 : Be sure to place the remote controller at the position where its signal can reach the air conditioner even during
TIMER operation, or the set time may deviate within the range of about 10 minutes.
NOTE2 : Reset the timer in the following cases, or the set time may deviate and other malfunctions may occur.
● A power failure occurs.
● The circuit breaker functions.
2. Cancel
TIMER setting can be cancelled with the ON or OFF TIMER buttons. (“” or “”)
To cancel the ON timer, press the “” button.
To cancel the OFF timer, press the “” button.
TIMER is cancelled and the display of set time disappears.
PROGRAM TIMER
● The OFF timer and ON timer can be used in combination.
● “” and “ ” display shows the order of the OFF timer and ON timer operation.
(Example 1) The current time is 8:00 PM.
The unit turns off at 11:00 PM, and on at 6:00 AM.
(Example 2) The current time is 11:00 AM.
The unit turns on at 5:00 PM, and off at 9:00 PM.
NOTE : TIMER setting will be cancelled by power failure or breaker functioning.
31
GREEN SIGN
21 22 23 24 25 26 27 28 29 30
GREEN SIGN
21 22 23 24 25 26 27 28 29 30
GREEN SIGN
21 22 23 24 25 26 27 28 29 30
Light upBlinking light
Press once
< Cooling >
Press again
< Heating >
Press once again
< Stop >
EMERGENCY
OPERATION switch
Blinking lamp shows
the room temperature
Lighting lamp shows
the set temperature
Color of the lamp
RED
ORANGE
GREEN
Operating condition
The unit operates at high power.
The unit operates at middle power.
The unit operates with energy-saving.
9-8. EMERGENCY-TEST OPERATION
In case of test run operation or emergency operation, use the EMERGENCY OPERATION switch on the front of the
indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote
controller run down. The unit will start and the POWER MONITOR lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan speed runs at
High speed and the system is in continuous operation. (The thermostat is ON.)
After 30 minutes of test run operation the system shifts to EMERGENCY COOL/HEAT MODE with a set temperature of
24°C.
The fan speed shifts to Med. speed.
The coil frost prevention works even in emergency operation, and defrosting too.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO mode.
Emergency operation continues until the EMERGENCY OPERATION switch is pressed once or twice or the unit receives
any signal from the remote controller. In case of latter normal operation will start.
NOTE : Do not press the EMERGENCY OPERATION switch during normal operation.
9-9. POWER MONITOR LAMP
The color of POWER MONITOR lamp is GREEN in any of the following cases.
• When ON-timer is standby
• In DRY operation
• In EMERGENCY operation
• When defrosting of the outdoor unit is being done in HEAT operation
32
9-10. Operational frequency control of outdoor unit
Minimum
frequency
15
15
Model
MSZ-A09RV
MSZ-A12RV
COOL (indoor fan speed : High)
Rating
frequency
53
82
Maximum
frequency
80
88
Minimum
frequency
16
16
HEAT
Rating
frequency
67
98
Maximum
frequency
98
115
DRY
22/27
22/27
1Hr
Time
Maximum
frequency
frequency
Rating or under-rating frequency
1. Outline
The operational frequency is decided by following the procedures below:
First, set the target operational frequency based on the difference between the room temperature and the set temperature.
Second, regulate the target operational frequency by discharge temperature protection, high pressure protection, electric
current protection and overload protection and also by the maximum/minimum frequency.
(1) maximum/ minimum frequency in each operation mode.
w The maximum frequency in COOL mode is limited according to operation hours, as shown below.
(2) Frequency change speed
During increasing frequency
Operational frequencyMUZ-A09RV- E1 MUZ-A12RV- E1
10Hz to 14Hz0.5 sec./Hz
15Hz to 79Hz5 sec./Hz
80Hz to 150Hz0.5 sec./Hz
During decreasing frequency
Operational frequencyMUZ-A09RV- E1 MUZ-A12RV- E1
10Hz to 42Hz1 sec./Hz
43Hz to 150Hz0.5 sec./Hz
33
9-11 .Electronic expansion valve control (LEV control)
(1)Outline of LEV control
The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each operational frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air
conditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temperature
(Shell temperature) of the compressor, developing the unit’s performance.
(2)Specification of LEV control
Control rangefrom min. 33 pulse to max. 500 pulse.
Actuating speedLEV opens 40 pulse/sec. and close 90 pulse/sec.
Opening degree adjustmentLEV opening degree is always adjusted in opening direction.
standard
specification
Unit OFFLEV remains at max. opening degree (reaches max. opening
Remote controller ONLEV is positioned. (first full-closed at zero pulse and then
During 2 to 15 minutes after compressor startsOpening degree is adjusted according to standard opening
(When reducing the opening degree, LEV is once overclosed, and then adjusted to the proper degree by opening.
degree approx. 15 minutes after compressor stops)
positioned.)
degree.
(Standard opening degree is set for each rotational frequency of compressor)
More than 15 minutes have passed since compressor
start-up
general operation
Thermostat OFFLEV starts to open every 3 pulse/sec.
Thermostat ONLEV is controlled in the same way as that is after the com-
Defrosting in HEAT modeLEV is adjusted to open 350 pulse.
LEV opening degree is corrected to get target discharge
temperature of compressor.
(For discharge temperature lower than target temperature,
LEV is corrected in closing direction.)
(For discharge temperature higher than target temperature,
LEV is corrected in opening direction.)
wIt may take more than 30 minutes to reach target temperature, depending on operating conditions.
from
the same opening degree as that when the Unit turned IFF
(and becomes full-opened after approx. 15 minutes.)
pressor has started up.
34
(3) Time chart
OFF Time
Time
ON
The operational frequency of the compressor
Commanded
to open
Standard
opening
degree
Opening degree is
corrected according
to discharge
temperature
Positioning
Air conditioner ON
Air conditioner OFF
(thirmostat off)
LEV opening degree
15 min.
06
05
04
03
02
01
LEV opening degree
A(target discharge temperature)
B
C
D
E
F
305070
The operational frequency of the compressor
90110130
(Hz)
(4) Control data
(a) Reference value of target discharge temperature
(Cooling
:/Heating :)
A
58/49B60/58C68/67D70/70E72/72F72/72
In COOL mode, the two indoor coil thermistor (one main and one sub) sense temperature ununiformity (super heat) at the
heat exchanger, and when temperature difference have developed, the indoor coil thermistors adjust LEV opening to get
approximate 10 degrees lower temperature than the target temperature in the table above, thus diminishing super heat.
(b) Reference value of LEV standard degree opening
The AC fan motor turns ON/OFF, interlocking with the compressor.
[ON]
The AC fan motor turns on 5 seconds before the compressor starts up.
[OFF]
The AC fan motor turns off 15 seconds after the compressor stops running.
9-13. 4-way valve control
COOL&DRY mode
HEAT mode
w The 4-way valve does not turn ON before the compressor starts up.
. . . . . . . . .
. . . . . . . . . . . . . . .
ON(voltage applied)
The 4-way valve turns ON as soon as thermostat turns ON.
The 4-way valve turns OFF 15 minutes after the thermostat turns OFF.
OFF(voltage not applied)
During normal HEAT operation the 4-way valve is OFF.
<COOL>
5 seconds
ON
OFF
ON
OFF
ON
OFF
Compressor
4-way valve
Outdoor fan
<HEAT>
5 seconds
36
9-14. Indoor fan motor control
Microprocessor
controller board
220~240V AC
SSR output
Rotational frequency
every 100Hz pulse output
AC motor
actuator (SSR)
AC motor
Rotational
frequency
sensor
part
Output
Input
The detected rotational frequency of the fan motor is feed backed to the microprocessor and then the microprocessor works
to keep the rotational frequency at a fixed value against load fluctuation.
(1) Circuit block diagram
(2) Control system
<Output side>
The microprocessor outputs pulse
every 100Hz (every 50Hz in half wave).
(Fan speed varies according to the
time span between a Zero-cross point
on the commercial wave and a pulse
out put point.)
<Input side>
The microprocessor detects rotational
frequency of AC fan motor, using Hall
element in AC fan motor.
The microprocessor drives SSR on
relay P.C. board.
The microprocessor adjusts rotational
frequency.
If feed backed pulses are not detected for 12
seconds, fan motor becomes abnormal and
indoor POWER MONITOR lamp flashes to
show abnormality.
Controlled voltage
is applied to AC
fan motor.
37
10SERVICE FUNCTIONS
Jumper wireChange point
Deforst finish temperature changes from 13: to 15:.
JP7
MSZ-A09RV -MUZ-A09RV MSZ-A12RV -MUZ-A12RV -
E1E1
E1E1
10-1. CHANGE IN DEFROST SETTING
<JP7> When the JP7 wire of the outdoor electronic control P.C. board is cut, the defrost temperature will be changed.
(Refer to page 55.)
10-2. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.
The time will be shortened as follows. (Refer to page 54.)
Set time : 1 minute ➔ 1-second
Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit of JPG and JPS.)
10-3. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room. In this case, to operate each indoor
unit individually by each remote controller, P.C. boards of remote controller must be modified according to the indoor unit
number.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below;
NOTE : Fore re-modelling, take out the batteries at first.
After finish re-modelling, put back the batteries then push the RESET-button.
The P.C. board has the print “J1” and “J2”. Jumper wires are mounted to each “J1” and “J2”.Cut “J1” and “J2” according to
the number of indoor unit as shown in Table 1.
After modification, push the RESET. button near the MIN-button on the remote controller.
Table1.
1 unit operation
No.1 unit
No modification
No.2 unit
No.3 unit
No.4 unit
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the
remote controller for the indoor unit.
The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they
are set.
The setting will be cancelled if the breaker has turned off, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
2 unit operation
Same as at left
Cut J1
38
3 unit operation
Same as at left
Same as at left
Cut J2
4 unit operation
Same as at left
Same as at left
Same as at left
Cut both J1 and J2
10-4. AUTO RESTART FUNCTION
C11
52C
CN201
CN112
CN121SW
CN111
IC101
CN211
CN151
JR07
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C.board. The “AUTO RESTART FUNCTION” sets to work the moment
the power has restored after power failure, then, the unit will restart automatically. If the unit is operated in “I FEELCONTROL.” mode before power failure, the operation is not memorized. In “I FEEL CONTROL.” mode, the operation is decided by the initial room temperature at (re)start.
How to set “AUTO RESTART FUNCTION”
1Turn off the main power for the unit.
2Remove the indoor electronic control P.C. board and the display P.C.board.(See page 57.)
3Pull the indoor electronic control P.C. board forward and cut the RESISTOR JR07 on it.
Operation
1If the main power (220-240V AC) has been cut, the operation settings remain.
2After the power is restored, the unit restarts automatically according to the memory.(However, it takes at least 3 minutes
for the compressor to start running.)
NOTE:
•The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote
controller.
•If the main power is turned off or a power failure occurs while AUTO START/STOP timer is active, the timer setting is
cancelled.
•If the unit has been off with the remote controller before power failure, the auto restart function does not work as the
power button of the remote controller is off.
•To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on at the same
time.
•When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current
by adding to the system that allows the units to start one by one.
39
TROUBLESHOOTING11
Housing point
Insert the negative pole
of the batteries first.
Check if the polarity of
the battereis is correct.
RESET button
Cover
Relay P.C. board
Electronic control P.C. board
MSZ-A09RV MSZ-A12RV -
E1
MUZ-A09RV -
E1
MUZ-A12RV -
E1
E1
11-1. 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 confirming 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 P.C. boards.
3) When removing the 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.
Lead wiring
3. Caution for the outdoor unit repair service
1) Do not load on the P.C.board cover.
2) Since every P.C.board circuit links directly with
power supply 220~240V AC, do not short the
P.C.board and metal section on servicing. Also
if touch the parts on the P.C.board, it may cause
an electric shock.
3) When closing the P.C.board cover, prevent a
foreign matter or dust from coming inside the
P.C.board.
3. Troubleshooting procedure
1) First, check if the POWER MONITOR 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) Before servicing check that the connector and terminal are connected properly.
3) If the P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for
bursting and discoloration.
4) When troubleshooting, refer to the flow chart on page 41 and the check table on page 42 and 43.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, the remote controller can not be repaired only by the battery replacement. To operate the remote controller
normally, replace the batteries in the following order.
This remote controller has the RESET button. After refilling new batteries, press the RESET button with tip end of ball
point pen or the like, and then use the remote controller.
1 Remove the back lid and replace batteries.
Then re-attach the back lid.
2 Press the RESET button.
40
11-2. Troubleshooting procedure
The following procedure facilitates identifying defective points.
The abnormalities in
Indoor unit dose
not respond to
remote controller.
Refer to G ‘Check of
indoor electronic control
P.C. board’ on page 49.
can be located in the Troubleshooting check table on page 42~43.
Power monitor
lamp flashes.
Operation start
Indoor unit does not respond to
remote controller. In addition,
operation Power monitor lamp
dose not light up, with emergency operation switch ON.
Refer H ‘Check of indoor
electronic P.C. board’ on
page 50.
3 time flash
2.5 seconds OFF
Indoor fan motor
dose not run.
1-time flash
2.5 seconds
or
0.5 seconds
OFF
Cause:indoor/outdoor
unit
Mis-wiring
·
Serial signal error
·
Refer to
‘Checking serial
signal error’ on
page 44.
Inverter/Compressor
2 time flash
2.5 seconds OFF
Cause: in Indoor unit
Main indoor coil ther-
·
mistor abnormality
Room temperature
·
thermistor abnormality
Sub indoor coil thermis-
·
tor abnormality
Check :
indoor/outdoor
Mis-wiring on
page 44.
5-time flash
2.5 seconds OFF
6-time flash
2.5 seconds OFF
12-time flash
2.5seconds OFF
Check :
· Main indoor coil
thermistor
· Room temperature
thermistor
· Sub indoor coil
thermistor
Cause: in outdoor unit
Outdoor power sys-
·
tem abnormality
Outdoor unit temper-
·
ature thermistor
abnormality
·Outdoor converter
power system abnormality.
Refer to I
‘Check of outdoor thermistors’
on page 50.
Refer to F ‘Check of
indoor fan motor’ on
page 49.
7 time flash
2.5 seconds OFF
Cause: in outdoor unit
Outdoor control system
·
error
Check :
Outdoor
electronic
control P.C.
board.
Refer to A ~ E
‘Compressor’ on
page 47 and 48.
wIn case of serial signal
error, the mis-wiring
indication will appear
by turning the power
off and then turning it
back on.
Refer to A ~ E
‘Transistor module’
on page 47 and 48.
Refer to L 'Check
of power supply' on
page 52.
Outdoor electronic
control P.C. board.
Refer to J ‘Check
of R.V. coil’ on page
51.
Refer to N ‘Check of electronic control P.C. board in
the outdoor unit’ on page 52.
41
Refer to K ‘Check
of outdoor fan
motor’ on page 51.
Refer to P ‘Check of
linear expansion valve
(LEV)’ on page 53.
1. Troubleshooting check table (Indoor unit troubleshooting check table)
No.
1
w2
w3
5
6
7
Symptom
POWER MONITOR lamp
Abnormal pointDetection methodCheckpoint
Outdoor unit
does not
operate
repeated flashes
every 0.5 seconds
1-time flash
2.5 seconds OFF
2-time flash
2.5 seconds OFF
5-time flash
2.5 seconds OFF
Mis-Wiring
Serial signal
Outdoor power
system
6-time flash
2.5 seconds OFF
Outdoor
thermistors
7-time flash
2.5 seconds OFF
Outdoor control
system
Main indoor coil
thermistor
Sub indoor coil
thermistor
Room
temperature
thermistor
When indoor electronic control P.C. board does not
receive serial signals for 4 to 5 seconds with
OPERATION/STOP(ON/OFF) button of remote
controller ON and 52C relay ON for the first time,
NOTE: In case of serial signal error, mis-wiring
indication will appear by turning power off and
then turning it back on.
When indoor electronic control P.C. board does not
receive serial signals from outdoor unit for 4 to 5
seconds.
Indoor electronic control P.C. board constantly
detects resistance every 8 seconds.
When thermistor shorts or opens.
When compressor has stopped due to overcurrent
protection or start-up failure protection 3 times in a
row within 1 min. after start-up.
<Thermistor short>
Thermistors are abnormal when they short after
compressor start-up.
<Thermistor open>
Thermistors are abnormal when they open after
compressor start-up.
However, discharge temperature thermistor is
abnormal when open circuit is detected more than
10 min. after compressor start-up.
When nonvolatile memory data cannot be read properly
on outdoor electronic control P.C. board, outdoor unit
stops and restarts 3 minutes later,
· Shortage of
refrigerant
· Outdoor electronic
control P.C. board
Refer to I "Check
of outdoor
thermistors" on
page 50.
Refer to the
characteristics of main
indoor coil thermistor,
sub indoor coil
thermistor and room
temperature on page
54.
Refer to "How to
check
inverter/compressor"
on page 47.
Replace outdoor
electronic control P.C.
board.
Refer to 'Checking
serial signal error' on
page 44.
w4
3-time flash
2.5 seconds OFF
Indoor fan motor
When rotational frequency feedback signal is not
emit during 12-second indoor fan operation.
Refer to F "Check of
indoor fan motor" on
page 49.
8
12-time flash
2.5 seconds OFF
Converter power
system
When the converter protective suspension within 1
minute after start-up of the converter is operated 5
times successively.
Also bus-bar voltage malfunction (140V or less or 400V
or more) within 1 minute after start-up of the converter
has happened 5 times successively.
Refer to N "Check of
outdoor electronic
control P.C.board" on
page 52.
MSZ-A09RV -
MSZ-A12RV -
· Flashing of the POWER MONITOR lamp indicates possible abnormalities.
· The POWER MONITOR lamp is lighting during normal operation.
E1
E1
flash
wWhen the indoor unit has started operation and the above detection method has detected an abnormality (the first detection
after the power ON), the electronic control P.C. board turns OFF the 52C and the indoor fan motor with the operation indicator lamp lighting.
When the 52C and the indoor fan motor are turned ON again 3 minutes later and the same abnormality is detected (a sec-
ond detection of the above abnormality after the power ON), the control P.C. board turns OFF the 52C and the indoor fan
motor with the operation indicator lamp flashing.
However, the first detection is cleared in case the power is turned OFF after the first detection.
42
(Outdoor LED indication table)
MUZ-A09RV MUZ-A12RV -
E1
E1
NOTE 1. The location of LED is illustrated at the right figure.
2. LED lights up during normal operation.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Symptom
Outdoor unit
does not
operate
'Outdoor unit
stops and
restarts 3
min. later' is
repeated
Outdoor unit
operates (at
low
frequency)
Outdoor unit
operates
LED indication
1-time flash every
2.5 seconds
NOTE:
For abnormality
location, refer to
'Indoor
troubleshooting
check table' on
page 43.
2-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
5-time flash
2.5 seconds OFF
7-time flash
2.5 seconds OFF
8-time flash
2.5 seconds OFF
1-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
5-time flash
2.5 seconds OFF
7-time flash
2.5 seconds OFF
8-time flash
2.5 seconds OFF
9-time flash
2.5 seconds OFF
Abnormal point
Converter power
system
Outdoor power
system
Outdoor
thermistors
Outdoor control
system
Over current
protection
Discharge
temperature
overheat
protection
Fin temperature
thermistor overheat
protection
High pressure
protection
Mis-start up
protection
Position detection
protection
Frequency drop by
current protection
Frequency drop by
high pressure
protection
Frequency drop by
defrosting in COOL
mode
Frequency drop by,
discharge
temperature
protection
Outdoor
thermistors
Defrost thermistor
low discharge
temperature
protection
Converter
protection
Inverter check
mode
When the converter protective suspension within 1 minute after
start-up of the converter is operated 5 times successively.
Also bus-bat voltage malfunction (140V or less or 400V or
more) within 1 minute after- start-up of the converter has
happened 5 times successively.
When compressor has stopped by overcurrent protection or
start-up failure protection within 1 min. after compressor startup 3 times in a row, compressor stops and then restarts 3 min.
later.
When discharge temperature thermistor or fin temperature
thermistor shorts or opens during compressor running,
compressor stops and restarts 3 min. later.
When nonvolatile memory date cannot be read properly,
compressor stops and restarts 3 min. later.
When 19A current flows into power transistor, compressor
stops and restarts 3 min. later,
When discharge temperature thermistor exceeds 116:,
compressor stops and restarts 3 min. later.
(Compressor restarts when discharge temperature thermistor
reads 100: or below.)
When temperature at heat sink exceeds 88: or outdoor
electronic control P.C. board exceeds 67:, compressor stops
and restarts 3 min. later.
When indoor coil thermistor exceeds 75:, compressor stops
and restarts 3 min. later.
When switching from forced drive to normal drive
(synchronised operation by a position detectable signal) failed
5 times successively at compressor start-up.
Restart-up after suspension when miss start-up or abnormal
position detecting within 10 seconds after start-up.
When the position detectable signal is not input during normal
starting up (synchronised operation by a position detectable
signal) after 10 seconds of compressor operation.
When current from power outlet exceeds 10. A, compressor
frequency lowers.
When indoor coil thermistor exceeds 55: in HEAT mode,
compressor frequency lowers.
When indoor coil thermistor reads 8: or below in COOL mode,
compressor frequency lowers.
When discharge temperature thermistor exceeds 111:,
compressor frequency lowers.
When defrost thermistor short or open.
w In this case, compressor continues running.
When discharge temperature has been 50: or below for 20
min.
When the converter suspends for protection
•Response abnormal suspension
•Bus-bar voltage abnormal suspension
•Converter overcurrent/ over voltage protective suspension
•Converter current detection abnormal suspension
•Converter zero cross abnormal suspension
When disconnecting the compressor connector, going to
inverter check mode.
<Outdoor electronic control P.C. board>
IPM
PFC
Flashing
LED
Detection methodCheckpoint
· Refer to N 'Check of electronic
control P.C. board on page 52.
· Refer to 'Checking inverter/
compressor on page 47.
· Refer to I 'Check of outdoor
thermistors' on page 50.
Replace outdoor electronic control
P.C. board.
Refer to A-E in 'How to check
inverter/ compressor' on page 47~ 48.
· Check refrigerant circuit and
refrigerant amount.
· Refer to I'Check of outdoor
thermistor' on page 50.
· Check around outdoor unit.
· Check outdoor unit air passage.
· Check refrigerant circuit and
refrigerant amount.
· Check stop valve.
Check and replace as follows.
1 Check the compressor connecting lead
Refer to A~E Inverter Compressor
simple check method on page 47 and 48.
The unit is normal, but check the
following.
· Check if indoor filters are clogged
· Check if refrigerant is short.
· Check if indoor/outdoor unit air
outlets are short cycled.
Refer to I 'Check of outdoor
thermistors' on page 50.
Refer to I 'Check of outdoor
thermistors' on page 50.
· Refer to P 'Check of LEV' on
page 53.
· Check refrigerant circuit and
refrigerant amount.
· Refer to N 'Check of electronic
control P.C. board on page 52.
· Refer to A~E Inverter Compressor
simple check method on page 47
and 48.
43
2. Checking mis-wiring and serial signal error.
1. Turn OFF power supply.
2. Turn ON power supply.
3. Press the EMERGENCY OPERATION switch.
Is the self-check function of indoor unit indicated when relay 52C turns ON
3min. later?
wShort circuit of JPS (one-hour short circuit jumber cable) and JPG (GND
resistance) enables self-check function to be indicated within 3 min.
Is there indoor-outdoor mis-wiring,
poor contact, or disconnection?
Is there approx. 220-240V AC between outdoor
terminal block 2 and 1 ?
Is mis-wiring or
serial signal error
indicated when
relay 52C turns
ON 3 min. later?
Is there 370V DC between both ends of
smoothing capacitor(C62) on the electronic
control P.C. board?
Replace in-out connecting
wire.
Does Power monitor lamp (on the right-hand
side) flash on and off when
OPERATE/STOP(ON/OFF) button on remote
controller is pressed?
w1 If there is any error in
serial signal system, the
mis-wiring indication will
appear by turning the
power off and then
turning it back
w2 Mis-wiring may damage the electronic
control P.C. board during the operation in
the left. Be sure to confirm the wiring is
correct before the operation starts.
w3 Replace indoor
electronic control
P.C. board.
w3 Be sure to release the
failure-mode recall function
after checking.
w The serial signal indication on the Power
monitor lamp (right side) facilitates
checking abnormality, based on the
failure-mode
Mis-wiring indication
No
No
Yes
Correct wiring
Replace outdoor electronic control P.C. board.
· Main circuit
· Reactor
· Noise filter P.C.
board
· Connection of
connector
Yes
A
B
Turn off power supply and confirm that indoor-outdoor
wiring is correct.
Short-circuit indoor terminal block N and 3.
While pressing OPERATE-STOP(ON/OFF) button on
remote controller, press RESET button.
(The above procedure allows Power monitor lamp to
indicate the failure-mode) w2
Open-circuit indoor terminal block N and 3,
Check if there is amplitude of 5 to 10VDC between outdoor
terminal block N and 3 (for confirmation of serial signal)
and if there is 220-240V AC between 2 and N.
1. Unplug the power cord.
2. Disconnect the connector between compressor and IPM.
3. Plug the power cord.
4. Press EMERGENCY OPERATION switch.
2.5 seconds OFFONON
Serial signal error indication
defective
Yes
No
Yes
Yes
No
Yes
No
(light up or OFF)
· Turn off invertercontrolled
lighting
equipment.
· Plug the power
cord.
· Press
EMERGENCY
OPERATION
switch.
A
B
· Keep the unit
away from
fluorescent
light.
· Attach a filter
to lightintercepting
part.
Green Sign
flash
21
22 2430292827
262523
Outdoor unit does not operate. When the POWER MONITOR lamp (on the left-hand side) flashes on and off continuously
or only once.
44
3. Trouble shooting procedure of main parts
23
W
U
V
1
WHT
Compressor motor
RED BLK
2
3
1
WHT
RED
BLK
(Simple check method of main parts)
MSZ-A09RV -MUZ-A09RV MSZ-A12RV -MUZ-A12RV -
Checking method and criterionPart name
Room temperature
thermistor(RT11)
Indoor coil thermistor
(RT12,RT13)
Defrost
thermistor
(RT62)
Discharge
temperature
thermistor
(RT61)
Disconnect the connector and measure the resistance with a tester.
(Part temperature : 10:~30:)
Disconnect the connector and measure the resistance with a tester.
(Part temperature : -10:~40:)
Disconnect the connector and measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
(Part temperature : 20:~40:)
E1E1
E1E1
NormalAbnormal
8k"~20K"Open or short circuit
NormalAbnormal
5k"~55K"Open or short circuit
NormalAbnormal
100k"~250K"Open or short circuit
Fin temperature
thermistor
(RT64)
Compressor
(MC)
Indoor fan
motor(MF)
Disconnect the connector and measure the resistance with a tester.
(Part temperature : -10:~80:)
NormalAbnormal
5k"~30K"Open or short circuit
Disconnect the connector and measure the resistance between the terminals with a tester.
(Winding temperature : -10:~40:)
NormalAbnormal
0.82"~1.01"Open or short circuit
Measure the resistance between the terminals with a tester.
(Winding temperature : 10:~30:)
Terminal
(CN211)
NormalAbnormal
WHT-BLK280"~304"
BLK-RED311"~338"
Open or short circuit
45
Outdoor fan
WHT
RED
BLK
P
YLW
ORN
LEV
WHT6
RED1
ORG4
YLW5
BRN2
BLU3
ORN
BLUYLW
RED
PNK
ROTOR
motor(MF61)
Checking method and criterionPart name
Measure the resistance between the terminals with a tester.
(Winding temperature : -10:~40:)
TerminalNormalAbnormal
WHT-BLK173.7'~212.6'
BLK-RED277.8'~339.9'Open or short circuit
Measure the resistance between the RED terminal and the other ones.
(Winding temperature : 20:~30:)
NormalAbnormal
approx. 300' in each
phase
Open or short circuit.
Measure the resistance between the terminals with a tester.
(Part temperature : -10:~40:)
NormalAbnormal
882'~1079'
Open or short circuit.
Measure the resistance with a tester.
(Part temperature : -10:~40:)
Terminal
(CN724)
NormalAbnormal
WHT-RED
RED-ORN
YLW-BRN
42'~52'Open or short circuit
BRN-BLU
46
(How to check inverter/compressor)
Check of open phase
A
●Be sure to use the analog voltmeter for measurement
●Disconnect the connector between compressor and IPM , activate
the inverter and measure the balance of voltage between
terminals.
Output voltage : 120V
<< Operation method>>
Start heating opration by pressing the Emergency operation switch
on the indoor unit. (test-run mode)
<<Measurement point>>
at 3 points
BLK-WHT
BLK-RED
WHT-RED
NOTE Measure AC voltage, at 3 points more than one minute ofter
the outdoor fan motor starts running.
Check of IPM
B
●Disconnect the connector between compressor and IPM, and
measure resistance between terminals on the IPM.
<<Measurement point>>
at 6 points
BLK-WHT, WHT-BLK
BLK-RED, RED-BLK
WHT-RED, RED-WHT
at 6 points
<<Judgment>>
Infinite ["]···········normal
0~dozens of ······abnormal (short)
w Measure resistance between
the lead wires at 3 points
ohmmeter indication
Normal
(infinite)
Abnormal
(0~dozens of ")
X1
"
X1
"
2.5 seconds OFF9 flashes
<Outdoor electronic control P.C. board>
LED
IPM
PFC
Note1.Output voltage changes depending power supply
voltage. (Max. i10%)
2. Measure by analogue tester.
3. During the measurement, LED in the outdoor electronic
control P.C. board flashes 9 times.
flash
Start
Check voltage
between terminals.
Are voltages
balanced?
Yes
Check
compressor.
Disconnect the connector between compressor and IPM.
See A 'Check of open phase.'
No
Check resistance of IPM.
Is resistance
infinite?
See C 'Check of compressor.'
See B 'Check of IPM.'
Yes
No
(0~several
")
Outdoor electronic control
P.C. board is defective.
Replace outdoor electronic control P.C. board
and IPM.
IPM is defective.
47
Check of compressor winding
D
Check of compressor
C
● Disconnect the connector between compressor and IPM, and
measure resistance between the compressor terminals.
<<Measurement point>>
at 3 points
BLK-WHT
BLK-RED
WHT-RED
<<Judgment>>
0.82 to 1.01" at -10: to 40: of part temperature.
0["] ···············abnormal [short]
Infinite["] ·······abnormal [open]
NOTE 1.Be sure to zero the ohmmeter before measurement.
2.Winding resistance for each phase is 0.45" at 20:.
Check of compressor operation time
E
●Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to overcurrent.
<<Operation method>>
Start heating or cooling operation by pressing the emergency
operation switch on the indoor unit. (Test-run mode)
<<Measurement>>
Measure the time from the start of outdoor fan running till the
stop of the inverter due to overcurrent.
<<Judgment>>
For reference
0~10 seconds·····················abnormal (short)
10~60 seconds···················abnormal (compressor lock-out)
60 seconds~5 minutes·······abnormal (refrigerant circuit defect)
more than 5 minutes···········normal
w Measure resistace between the
lead wires at 3 points.
Outdoor fan starts
Abnormal
(Compressor short circuit or layer short)
Abnormal
(Compressor lock-out)
Abnormal
(refrigerant circuit defect, etc.)
Normal
0 sec.
10 sec.
60 sec.
5 min.
Normal
(1~several ")
Abnormal
(0" ····· short)
Abnormal
(infinite····· open)
Ohmmeter indication
Check resistance of compressor.
Check compressor operation time.
Ok
Compressor is short or
open.
Replace compressor.
See D 'Check of compressor winding'.
Is resistance
1~several " at -10:
~ 40: of winding
temperature?
Does compressor run
continuously?
See E ' Check of compressor operation time,'
No
Compressor is layer short
or lock-out.
Refrigerant circuit is
defective.
Replace compressor.
Check refrigerant circuit.
No
Yes
X1
"
X1
"
X1
"
23
W
U
V
1
WHT
Compressor motor
RED BLK
Yes
48
●Re-install the unit
away from the lights.
●Attach a filter to lightintercepting part.
Check of remote controller and indoor electronic control P.C. board.
G
Check of indoor fan motor
F
Turn off power
supply and check
connector CN
211 visually.
Are lead wires
disconnected?
No
No
Yes
Yes
No
No
Yes
Yes
Ok
Disconnect lead wires from
CN 211 on indoor electronic
control P.C. board.
Measure resistance
between lead wire 1 and 3
and then 2 and 3.
Yes
Yes
No
No
(not clear)
No
Yes
(How to check main parts)
Indoor fan does not operate.
Indoor unit operates by pressing the emergency operation switch.
Is soldered
point
abnormal?
Re-connect
lead wires.
Is LCD display on
remote controller
visible?
Does the unit
operate with
remote
controller?
Is noise
heard from
the radio?
Are there any
fluorescent lights
of inverter or
radio start type
within 1 meter?
Is resistance
0" (short) or "
(open) ?
Re-solder it.
Replace batteries and
then press RESET
button.
See page 40.
Replace indoor
fan motor.
Replace indoor
electronic
control P.C.
board.
CN211
3
2
1
fan
motor
Indoor electronic
control P.C. board
Check the model
name of remote
controller.
Remove batteries, then set them back
and press the reset button.
Tune a radio in
to AM and press
OPERATE/STOP
(ON/OFF)button
on remote
controller.
Replace remote
controller.
Model name and
part No.
are witten here.
Back side of
remote controller
()
LD101
1
2
3
4
5
1
2
3
4
5
Remote
controller
Indoor electronic
control P.C. board
light-interception
ihdication board
Replace the indoor
electronic control
P.C. board with
power monitor,
receiver P.C. board.
49
Check of outdoor thermistors
I
Check of indoor electronic P.C. board
H
Measure
resistance
between CN
6411 and 2
.
Measure
resistance
between CN
6421 and 2
.
No
Yes
The unit does not operate with the remote controller. The POWER MONITOR lamp does not light up either,
with the Emergency operation switch on.
Thermistors in the outdoor unit are abnormal.
Re-connect the
connector.
Indoor electronic
control P.C. board
Varistor (NR11)
Indoor electronic
control P.C. board
Fuse (F11)
1
3
N
2
3
Thermal fuse connector
●Disconnect the connectors CN 641 and CN 642 from the outdoor electronic control P.C. board.
(Check the characteristics of each thermistor.)
1 Connect CN 641 and
CN 642.
2 Disconnect the
connector between
compressor and IPM.
(Defrost thermistor)
Measure
resistance
between CN
6413 and 4
.
Turn on power
supply to indoor
unit and press
emergency
operation switch.
Discharge
temperature
thermistor
()
Fin
temperature
thermistor
()
Does the unit operate
10 minutes or more?
No
Yes
Terminal
block
Is LED in the outdoor
electronic control P.C.
board flashing 5
minutes?
Replace the outdoor
electronic control P.C.
board.
No
Yes
Does the resistance
of thermistor have
the characteristics
on page 55?
Replace the
thermistor.
Check both “parts side”
and “pattern side” of indoor
electronic control P.C.
board visually.
Replace the fuse.
Is fuse(F11) blown?
Be sure to check both fuse
and varistor in any case.
Replace the fan motor.
Replace the
indoor electronic
control P.C. board.
Is winding resistance
of fan motor 0 "?
Is winding resistance
of vane motor 0 "?
No
Yes
Replace the vane motor.
No
Yes
Yes
Is varistor(NR11) burnt?
Replace the varistor.
Yes
Turn off the power supply.
Remove indoor fan motor connector CN211 and vane motor connector CN151
from the indoor electronic control P.C. board and turn on the power supply.
No
No
Does the unit operate with the remote controller?
Does the POWER MONITOR lamp light up by
pressing the emergency operation switch?
Yes
No
Be sure to check both resistance.
50
Check of outdoor fan motor
K
Check of R.V. coil
J
Disconnect connector between
compressor and IPM.
Turn on power supply to indoor
unit, and press emergency
operation switch to heating
operation.
Heating operation works when cooling is expected.
Outdoor fan motor does not work.
· Press emergency operation
switch again to check if 52C
relay works.
· Re-connect connecting wire
of indoor and outdoor unit.
· Replace the indoor electronic
control P.C. board.
· Replace the lead
wires of outdoor fan
motor.
· Re-connect
connector CN 771
· Replace the outdoor
fan motor.
Replace the R.V.
coil.
Replace the
relay P.C.
board.
• If the connector CN 913 is connected or the R.V. coil is open, the voltage occurs
between the terminals even when the control is OFF.
3 min. after power turns on, is there voltage of 220-240V
AC between CN 913 1 and 2 on relay P.C. board ?
3 minutes after power
turns on, is there voltage
of 220-240V AC between
outdoor terminal block 2
and N?
Is there voltage of
approx. 220-240V AC
either between 2 and 3
or between 2 and 4 or
between 2 and 5 at
CN 771?
Indoor -outdoor
connecting
wire
Outdoor terminal block TB1
N
2
3
Disconnect connector
CN 771 on relay P.C.
board.
Disconnect connector
between compressor
and IPM.
Turn on power supply
to indoor unit, and
press emergency
operation switch.
3 minites after
power turns on,
measure voltage
between terminals
of CN 771.
1
CN913
Relay P.C. board
2
4-way valve
AC 220-240V
Yes
Yes
Yes
No
No
No
CN771
Relay P.C. board
1
23
4
56
Fan
motor
Indoor-outdoor
connecting
wire
Outdoor terminal block TB1
N
2
3
Cooling operation works when heating is expected.
•First, measure resistance of the R.V. coil to check if it is defective or not.
• If the connector CN 913 is connected or the R.V. coil is open, the voltage occurs
between the terminals even when the control is OFF.
Replace the relay P.C. board.
Is there voltage of 0V between CN 912 1 (+)and 2 (-)
on relay P.C. board?
Approx. 1V
DC voltage
occurs.
Yes
Replace the
outdoor electrinic
control P.C. board.
Disconnect connector between
compressor and IPM.
Turn on power to indoor unit, and
press emergency operation switch
to cooling opeation.
3 min. after power turns on, is there voltage of 220240V AC between CN 913 1 and 2 on relay P.C.
Yes
No
Replace the relay P.C. board.
Is there voltage of 1V DC between CN 912 1 (+)and 2
(-) on relay P.C. board?
No
The voltage
is 0V
Yes
· Replace the lead
wires of R.V. coil.
· Re-connect
connector.
· Replace the 4-way
valve.
Replace the
outdoor electrinic
control P.C. board.
51
Check of thermal fuse
M
Check of power supply
L
3 minutes after power turns on, is there voltage of
approx. 220-240V AC between outdoor terminal block
2and N?
Unplug the power cord.Replace thermal fuse.
Inverter does not work.
· Press emergency operation switch again to check if 52C
relay works.
· Re-connect connecting wire of indoor and outdoor unit.
· Replace the indoor electronic control P.C. board.
Repair according to the LED indication.
Replace the outdoor electronic control P.C. board.
Ok
Ok
Is there approx. 370V DC between both ends of smoothing
capacitor (C62) on outdoor electronic control P.C. board?
Dose LED light up or flash on outdoor electronic control
P.C. board.?
Is resistance ∞ between connector CN 201 1 on indoor
electronic control P.C. board and terminal block N?
Yes
No
No
No
Flash
(How to check power supply and others)
Yes
No
CN201
Indoor electronic
control P.C. board.
Check the applicable parts by
LED indication.
Check of outdoor electronic control P.C. board
N
Cooling/heating does not operate. (Speed of compressor rotation does not inclease.)
Replace the outdoor electronic control P.C. board.
Does the outdoor unit fan operate
nomally?
Check the connecting CN911 in the relay P.C. board and
CN726 in the outdoor electronic control P.C. board.
Turn on power supply to indoor unit, and
press emergency operation switch.
Check LED indication in the outdoor
electronic control P.C. board.
No
Check the outdoor fan motor.
(Refer to page 46.)
Yes
Except 8-time flashing
8-time flashing
Converter protect
suspension.
· Main circuit
· Reactor
· Noise filter P.C. board
· Connection of connector
defective
Yes
Dose LED flash or light up on outdoor electronic control
P.C. board.?
Yes
Light up
LED
Outdoor electronic control P.C. board
C62
(+)
(-)
370V DC
Disconnect connector between compressor and IPM.
Turn on power supply to indoor unit and press
emergency operation switch.
· Press emergency operation
switch again to check if 52C
relay works.
· Re-connect connecting wire
of indoor and outdoor unit.
· Replace the indoor electronic
control P.C. board.
52
Replace LEV.
(coil defect)
Replace LEV.
Check of linear expansion valve (LEV)
P
• Press RESET button, while pressing OPERATION SELECT button on remote controller.
(All displays on operational display section are ON.)
• With remote controller set toward the indoor unit, press OPERATE/STOP(ON/OFF)
button and confirm one beep tone.
• With remote controller set toward the indoor unit, OPERATE/STOP(ON/OFF) button and
confirm two beep tones.
Confirm again
that LEV is
operating.
Replace outdoor
electronic control P.C.
board.
LEV operates in full-opening
direction.
· Is LEV connector connected?
· Is LEV coil properly fixed to the body?
Heating/Cooling do not operate.
Ok
Do you hear LEV "click,
click·······"?
Do you touch LEV and
feel it vibrate?
Does the resistance of LEV coil
have the characteristics?
Do you hear LEV
"click, click·········"?
No
Yes
Yes
Yes
Ok
Yes
Yes
No
No
LEV (CN 724)
WHT(6)–RED(1)
RED(1)–ORE(4)
YLW(5)–BRN(2)
BRN(2)–BLU(3)
resistance
39"~56"
Characteristics of LEV coil
❈After you have followed the entire flow chart of "Check of linear expansion valve (LEV)", be sure to follow the procedure below.
Replace current limiting resistor.
Check of rush current limiting circuit
O
Outdoor unit does not operate or stops immediately due to overcurrent.
NOTE : When the current limiting resistor is open, the rush current limiting relay
may not be working properly. There fore confirm the limiting resistor
works properly after replacing it.
Ok
Does current limiting resistor detect 10"?
No ∞
Yes
Start
· Re-connect the connector.
· Properly fix LEV coil to the body.
No
1Press EMERGENCY OPERATION switch.
2Unplug the power cord and then plug it again.
3Press RESET button on remote controller.
53
TEST POINT DIAGRAM AND VOLTAGE
0
0
10
20
30
40
10 20 30 40 50 60
MSZ-A09RV MSZ-A12RV -
E1
E1
Indoor electronic control P.C. board
12V DC
Varistor (NR11)
--
{
+
Fuse 250V AC 3.15A
Fan motor
power supply
}
}
Room temperature
thermistor (RT11)
Timer short
mode point
Main indoor coil
thermistor (RT12)
Sub indoor coil
thermistor (RT13)
Power supply
input 220240V AC
How to set “Auto restart function”
Cut the Resistor JR07.(Refer page 39.)
54
Emergency
operation switch
+
5V DC
}
--
Indoor coil thermistor (RT12, 13)
Room temperature thermistor (RT11)
)
''
Resistance (k
;;
Temperature (
)
-20 -10010203040
0
10
20
30
40
50
60
70
80
90
100
Temperature(:)
Defrost thermistor(RT62)
Temperature(:)
Discharge temperature thermistor(RT61)
0 102030405060708090100110120
0
100
200
300
400
500
600
700
0 1020304050607080
0
20
40
60
80
100
120
140
160
180
200
Temperature(:)
Fin temperature thermistor(RT64)
Resistance(k")
Resistance(k")
Resistance(k")
Outdoor electronic control P.C.board
MUZ-A09RV MUZ-A12RV -
E1
E1
220-240V AC
BACK
15V DC
12V DC
5V DC
370V DC
(C62)
LED monitor lamp
Power supply
zero crossing
signal 220240V AC
(CN726)
Connector for
indoor/outdoor communication
LEV
connector
(CN724)
FRONT
Fin
temperature
thermistor(RT64)
CN642
55
Defrost
thermistor
(RT62)
Discharge
temperature
thermistor(RT61)
CN641
Jumper wire for
change in defrost
setting(JP7).
(Refer to page 38.)
MUZ-A09RV MUZ-A12RV -
E1
E1
Noise filter P.C board
BACK
220-240V AC
FRONT
Relay P.C board
220-240V AC
FRONTBACK
Outdoor fan motor
220-240V AC
R.V. coil
220-240V AC
Power supply zero crossing
signal 220-240V AC (CN911)
56
DISASSEMBLY INSTRUCTIONS12
<"Terminal with lock mechanism" Detaching points>
In case of terminal with lock mechanism, detach the terminal as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism.
The terminal with no lock mechanism can be removed by pulling it out.
Check the shape of the terminal and work.
(1) Slide the sleeve and check if there is a locking lever or not.(2) The terminal with this connector is a terminal
Sleeve
with lock mechanism.
1Slide the sleeve.
2Pull the terminal while
Locking lever
12-1. MSZ-A09RV -MSZ-A12RV -
pushing the locking
lever.
E1E1
INDOOR UNIT
OPERATING PROCEDUREPHOTOS
1. Removing the front panel
(1) Remove the screw caps of the front panel.
Remove the screws.
(2) Pull the panel down to your side slightly and unhook the
catches at the top.
Photo 1
1Hold the sleeve, and
pull out the terminal
slowly.
Connector
Front panel
Screws
2. Removing the electronic control P.C. board and the
display P.C. board.
(1) Remove the front panel. (Refer to 1)
(2) Remove the screw of the electrical cover.
Remove the electrical cover.
(3) Remove the terminal cover.
Remove the screw of the terminal block.
(4) Remove the cord clamp.
(5) Remove the screw of the ground wire.
(6) Disconnect all the connectors and all the lead wires on the
electronic control P.C. board.
(7) Remove the electronic control P.C. board and the display
P.C. board.
Photo 2
Ground
Fan motor connector
Terminal block
cover
Room temperature
thermistor connector
Indoor electronic
control P.C.board
Vane motor
connector
Cord clamp
Terminal block
cover screw
57
OPERATING PROCEDUREPHOTOS
3. Removing the electrical box
(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical cover.
(3) Disconnect the connector of the indoor coil thermistor.
(4) Disconnect the motor connector (CN211) and the vane
motor connector (CN151) on the electronic control P.C.
board.
(5) Remove the screw fixing the electrical box, remove the
electrical box.
4. Removing the vane motor
(1) Remove the front panel.
(2) Remove the screws (both upper and lower) of the vane
motor, disconnect the connector.
(3) Remove the vane motor.
Photo 3
Electrical box
screw
Photo 4
Vane motor
screws
Drain hose
5. Removing the line flow fan and the indoor fan motor
(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical box.
(3) Pull out the drain hose from the nozzle assembly, remove
the nozzle assembly.
(4) Remove the screws fixing the fan motor.
(5) Remove the screws fixing the left side of the heat
exchanger.
(6) Lifting the left side of the heat exchanger.
(7) Remove the hexagon socket set screws.
(8) Remove the fan motor, and remove the line flow fan.
Vane motor
Photo 5
The screws
fixing the
left side of
the heat
exchanger
Indoor coil
thermistor
Fan motor
screws
58
12-2. MUZ-A09RV -MUZ-A12RV -
OUTDOOR UNIT
E1E1
OPERATING PROCEDURE
1. Removing the cabinet
(1) Remove the screws fixing the top panel and top panel.
(2) Remove the screws fixing the service panel.
(3) Pull down the service panel and remove it from the cabinet.
(4) Remove the screws fixing the cabinet.
Photo 2
2. Removing the inverter assembly
(1) Remove the top panel, the service panel and the cabinet.
(2) Disconnect the connectors (CN641),(CN642),(CN601) and
(CN724) on the electronic control P.C. board.
(3) Remove the connectors (CN771) and (CN913) on the relay
P.C. board.
(4) Remove the lead wires from the reactor(L64) on the TB2.
(5) Remove the screws fixing the relay panel.
3. Removing the electronic control P.C. board
(1) Remove the top panel, service panel and the cabinet.
(Refer to 1)
(2) Remove the cover.
(3) Remove all the connectors and the terminals on the control
P.C. board.
(4) Remove the connector from the compressor.
(5) Remove the screws fixing the PFC and IPM.
(6) Remove the electronic control P.C. board from the heat
sink.
4. Removing the relay P.C. board
(1) Remove the top panel, the service panel and the cabinet.
(Refer to 1)
(2) Remove all the connectors and the terminals on relay P.C.
board.
(3) Remove the relay P.C. board.
Screws
Hook
Photo 1
Screws
Photo 3
Photo 4
PHOTOS
Screws
Screws
Cover
screw
Screws
Connector
Electronic control P.C. board
5. Removing the noise filter P.C. board
(1) Remove the top panel, the service panel and the cabinet.
(Refer to 1)
(2) Remove the electronic control P.C. board and relay P.C.
board.
(3) Remove all the connectors and the terminals on noise filter
P.C. board.
(4) Remove the ground wire screwed down on the relay panel.
(5) Remove the noise filter P.C. board.
Relay P.C. board
Screws
Screws
Heat sink
Noise filter P.C. board
59
OPERATING PROCEDURE
6. Removing the outdoor fan motor
(1) Remove the top panel, the service panel and the cabinet.
(Refer to 1)
(2) Disconnect the connector remove the clamp of fan motor
lead wire.
(3) Remove the propeller fan nut and remove the propeller fan.
(4) Remove screws fixing the fan motor.
7. Removing the compressor
(1) Remove the top panel, the service panel and the cabinet.
(Refer to 1)
(2) Remove the soundproof felt.
(3) Remove the terminal cover on the compressor.
(4) Remove the electrical assembly. (Refer to 2)
(5) Recover gas from the refrigerant circuit.
(6) Disconnect the welded part of the discharge pipe.
(7) Disconnect the welded part of the suction pipe.
(8) Remove nuts fixing the compressor.
(9) Remove the compressor.
NOTE
● Before using a burner, reclaim gas from the pipes until the
pressure gauge shows 0 kg/cm
● Use the burner under the condition that gas can be recovered
even when the inner pressure rises by heat.
INSTALLATION PLATE
BOX (WH)
CORNER BOX LEFT (WH)
FRONT PANEL (WH)
SCREW CAP (WH)
CATCH
GRILLE (WH)
AIR FILTER
CORNER BOX RIGHT (WH)
DEODORIZING FILTER
AIR CLEANING FILTER
Symbol
in Wiring
Diagram
Q'ty/unit
2PCS/SET
3PCS/SET
See page 65.
(MAC-1800DF)
See page 65.
(MAC-1300FT)
BEARING MOUNT
SLEEVE BEARING
LINE FLOW FAN
DRAIN HOSE
NOZZLE (WH)
VANE UPPER (WH)
VANE LOWER (WH)
FUSE
VARISTOR
VANE CRANK SET
VANE MOTOR (HORIZONTAL)
VANE MOTOR (VERTICAL)
INDOOR FAN MOTOR
FAN MOTOR RUBBER MOUNT
ELECTRIC CONTROL P.C.BOARD
ELECTRIC CONTROL P.C.BOARD
GREEN SIGN P.C.BOARD
ROOM TEMPERATURE THERMISTOR
TERMINAL BLOCK
INDOOR COIL THERMISTOR
VANE MOTOR SUPPROT SET
THERMAL FUSE
Symbol
in Wiring
Diagram
Q'ty/unit
3.15A
UP & DOWN
UP & DOWN
RIGHT & LEFT
RC4V19 2PES/SET
3P
RIGHT & LEFT
93;
RemarksPart No.
NO.
Part Name
F11
NR11
MV1
MV2
MF
RT11
TB
RT12, 13
F12
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
MSZ-A09RV-
E1
(WH)
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
MSZ-A12RV-
E1
(WH)
AUTO RESTART
I
ncluding RECEIVER P.C. BOARD
AUTO RESTART
Including RECEIVER P.C. BOARD
MSZ-A12RV -(WH)
E1
E1
13-3. INDOOR UNIT ELECTRICAL PARTS
12
19
14
13
11
1
2
SLEEVE
BEARING
3
4
5
6
7
10
13-4. ACCESSORY AND
18
17
ROOM TEMPERATURE
THERMISTOR
16
REMOTE CONTROLLER PARTS
2223
9
8
FUSE
13-3. INDOOR UNIT ELECTRICAL PARTS
Part numbers that are circled are not shown in the illustration.
TOP PANEL
MOTOR SUPPORT
OUTDOOR HEAT EXCHANGER
GRILLE
FRONT PANEL
PROPELLER FAN
BASE
COMPRESSOR
STOP VALVE (LIQUID)
STOP VALVE (GAS)
SERVICE PANEL
BACK PANEL
PIPE ASSEMBL Y
4-WAY VALVE
CONDENSER NET
SEPARATOR
OUTDOOR FAN MOTOR
CAPILLARY TUBE
MUFFLER
MUFFLER SPECIAL
Symbol
in Wiring
Diagram
Q'ty/unit
SNB092FJAH
{6.35
{9.52
EXP. VALVE, CAPILLARY
RA6V28-
2PC/SET{3.0✕{2.0✕300
RemarksPart No.
NO.
Part Name
MC
MF61
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
MUZ-A09RV-
E1
MUZ-A12RV-
E1
13-5. OUTDOOR UNIT STRUCTURAL PARTS
MUZ-A09RV MUZ-A12RV -
1
2
3
E1
E1
17
16
15
1413
12
11
4
Part numbers that are circled are not shown in the illustration.
When servicing , cut the tube to the proper length as shown in the REFRIGERANT SYSTEM DIAGRAM.
See page 12.
FIN TEMPERATURE THERMISTOR
REACTOR
NOISE FILTER P.C BOARD
TERMINAL BLOCK
R.V. COIL
THERMISTOR SET
RELAY P.C BOARD
ELECTRIC CONTROL P.C BOARD
ELECTRIC CONTROL P.C BOARD
TERMINAL BLOCK
Symbol
in Wiring
Diagram
Q'ty/unit
RemarksPart No.
NO.
Part Name
RT64
L64
TB1
21S4
RT61,62
TB2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
MUZ-A09RV-
E1
MUZ-A12RV-
E1
DISCHARGE, DEFROST
T2W E71 704
10
DRAIN SOCKET ASSY
Symbol
in Wiring
Diagram
Q'ty/unit
RemarksPart No.
NO.
Part Name
11
MUZ-A09RV-
E1
MUZ-A12RV-
E1
DRAIN SOCKET 1ps
DRAI N CAP 3pcs
13-6. OUTDOOR UNIT
ELECTRICAL PARTS
MUZ-A09RV MUZ-A12RV -
1
E1
E1
8
7
6
5
2
Part number that is circled is not shown in the illustration.
13-7. ACCESSORY
3
10
4
64
13-8. AIR CLEANING FILTER
● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.
● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible.
● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.
● DO NOT reuse AIR CLEANING FILTER even if it is washed.
● DO NOT remove or attach AIR CLEANING FILTER during unit operation.
ModelPart No.
MSZ-A09RV MSZ-A12RV -
E1
E1
MAC-1300FT
13-9. DEODORIZING FILTER
● DEODORIZING FILTER removes ammonia and hydrogen sulfide emitted from tobacco, and odors of pets.
● Clean DEODORIZING FILTER every two weeks. If the filter is particularly dirty, clean the filter more often.
● For cleaning, soak the filter in warm water for a while, and then wash and rinse it. Dry the filter in the shade thoroughly.
● When the filter color is still dark even after cleaning, replace the filter with a new one.
Replace the filter at least once a year.
ModelPart No.
MSZ-A09RV MSZ-A12RV -
E1
E1
MAC-1800DF
● DEODORIZING FILTER and AIR CLEANING FILTER can be attached on either side.
65
HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN
CC
Copyright 1999 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in May 2002. No.OB230 REVISED EDITION-A
Distributed in Mar. 1999. MEE No. OB230 244
Made in Japan
New publication, effective May 2002
Specifications subject to change without notice.
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