Mitsubishi Heavy Industries FDT28KXE6A User manual

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1
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Manual No. '09·KX-SM -128
INVERTER DRIVEN MULTI-INDOOR UNIT
CLIMATE CONTROL SYSTEM
SERVICE MANUAL
Alternative refrigerant R410A use models
(OUTDOOR UNIT)
• Single use (Used also for combination)
FDC335KXE6-K, 400KXE6, 450KXE6, 504KXE6, 560KXE6, 560KXE6-K, 615KXE6, 680KXE6
• Combination use
FDC753KXE6, 800KXE6, 850KXE6, 900KXE6, 960KXE6, 1010KXE6, 1065KXE6, 1130KXE6,
1180KXE6, 1235KXE6, 1300KXE6, 1360KXE6
(Heat pump type)
KX6 series
FDT28KXE6A
36KXE6A
45KXE6A
56KXE6A
71KXE6A
90KXE6A
112KXE6A
140KXE6A
160KXE6A
FDUM22KXE6
28KXE6
36KXE6
45KXE6
56KXE6
71KXE6
90KXE6
112KXE6
140KXE6
FDUH22KXE6
28KXE6
36KXE6
FDTC22KXE6A
28KXE6A
36KXE6A
45KXE6A
56KXE6A
FDQS22KXE6
28KXE6
36KXE6
45KXE6
56KXE6
FDU71KXE6
90KXE6
112KXE6
140KXE6
224KXE6
280KXE6
FDFU28KXE6
45KXE6
56KXE6
71KXE6
FDTW28KXE6
45KXE6
56KXE6
71KXE6
90KXE6
112KXE6
140KXE6
FDK22KXE6
28KXE6
36KXE6
45KXE6
56KXE6
71KXE6
FDTQ22KXE6
28KXE6
36KXE6
FDFL28KXE6
45KXE6
71KXE6
FDTS45KXE6
71KXE6
FDE36KXE6A
45KXE6A
56KXE6A
71KXE6A
112KXE6A
140KXE6A
(INDOOR UNIT) - KX6 series -
Regarding the Duct Connected-High static Pressure-type Outdoor Air Processing
Unit Series (FDU500〜1800FKXE6), refer to the DATA BOOK No.'08
• KX-DB-122
• Note
updated November 19, 2009

CONTENTS
1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER..................... 1
1.1 Wired remote controller (Option parts)...................................................... 1
1.2 Operation control function by the indoor controller ...................................2
1.3 Operation control function by the remote controller ..................................8
1.4 Operation control function by the outdoor controller.................................9
2 SYSTEM TROUBLESHOOTING PROCEDURE............................................. 45
2.1 Basics of troubleshooting........................................................................ 45
2.2 Explanation of troubleshooting................................................................46
2.3 Contents of troubleshooting....................................................................47
2.4 Outdoor unit control PCB replacement procedure ................................101
2.5 Inverter PCB replacement procedure.................................................... 103
3 ELECTRICAL WIRING .................................................................................. 107
3.1 Indoor unit ............................................................................................. 107
3.2 Outdoor unit .......................................................................................... 129
4 PIPING SYSTEM............................................................................................ 130
5 APPLICATION DATA.................................................................................... 131
5.1 Installation of indoor unit........................................................................... 131
(a) Ceiling cassette-4 way type (FDT)..................................................... 132
(b) Ceiling cassette-4 way compact type (FDTC)....................................137
(c) Ceiling cassette-2 way type (FDTW) ................................................. 142
(d) Ceiling cassette-1 way type (FDTS) .................................................. 145
(e) Ceiling cassette-1 way compact type (FDTQ) ................................... 148
(f) Duct connected-High static pressure type (FDU) .............................. 151
(g) Duct connected-Middle static pressure type (FDUM)........................157
(h) Duct connected (Ultra thin)-Low static pressure type (FDQS)........... 160
(i) Wall mounted type (FDK) ..................................................................163
(j) Ceiling suspended type (FDE)........................................................... 166
(k) Floor standing (with casing) type (FDFL)........................................... 169
(l) Floor standing (without casing) type (FDFU).....................................172
(m) Duct Connected-Compact and Flexible type (FDUH)........................ 175
5.2 Electric wiring work instruction.................................................................. 178
5.3 Installation manual of wired remote controller (Option parts)...................184
5.4 Installation of outdoor unit.........................................................................188
5.5 Instructions for installing the branch pipe set............................................211

– 1–
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.1 Wired remote controller (Option parts)
The gure below shows the remote controller with the cover opened. Note that all the items that may be displayed in the liquid crystal
display area are shown in the gure for the sake of explanation.
Characters displayed with dots in the liquid crystal display area are abbreviated.
Pull the cover downward to open it.
＊ All displays are described in the liguid crystal display for explanation.
The figure below shows the remote control with the cover opened.
Installation of remote control
DO NOT install it on the following places in order to avoid malfunction.
(1) Places exposed to direct sunlight
(2) Places near heat devices
(3) High humidity places
(4) Hot surface or cold surface enough to generate condensation
(5) Places exposed to oil mist or steam directly
(6) Uneven surface
Cover
This button is used to fix the setting.
This button is used to set the silent mode.

– 2–
1.2 Operation control function by the indoor controller
(1) Operations of functional items during cooling/heating
Cooling Heating
Dehumidify
Fan
Operation
Functional item
Thermostat
ON Thermostat ON
Thermostat
OFF Thermostat OFF Hot start (Defrost)
Compressor
4-way valve
Outdoor fan
Indoor fan
Louver motor
Drain pump (4)











/
(2)




(2)




/ 
/




/ 
/
/(2)

()
()

/ 
/
/

/
/
/
Thermostat ON: 
Thermostat OFF: (2)
Note (1) : Operation : Stop /: Turned ON/OFF by the control other than the room temperature control.
(2) ON during the drain motor delay control
(3) Drain pump ON setting may be selected by the indoor unit function setting of the wired remote controller.
(2) Dehumidifying operation
(a) When the humidity sensor is not provided (Models other than FDT Series)
return air thermistor [ThI-A (by the remote controller when the remote control sensor is enabled)] controls the indoor
temperature environment simultaneously.
1) Operation is started in the cooling mode. When the difference between the return air thermistor and the setting
temperature is 2°C or less, the indoor unit fan tap is brought down by one tap. That tap is retained for 3 minutes
after changing the indoor fan tap.
2) If the suction air temperature exceeds the setting temperature 3°C or more during defrosting operation, the indoor
fan tap is raised by one tap. That tap is retained for 3 minutes after changing the indoor fan tap.
3) If the thermostat OFF is established during the above control, the indoor fan tap at the thermostat ON is retained so
far as the thermostat is turned OFF.
4) After stopping the cooling operation, the indoor unit continues to run at Lo for 15 seconds.
(b) When the humidity sensor is provided (FDT Series only) [Optional]
1) Operation starts in the cooling mode, and the target relative humidity is determined based on the setting temperature.
If the humidity detected by the humidity sensor becomes lower than the target relative humidity, the indoor unit fan
tap is retained.
2) Anything other than 1) above is same as the item (a) above.
(3) Timer operation
(a) Timer
Set the duration of time from the present to the time to turn off the air-conditioner.
It can be selected from 10 steps in the range from “OFF 1 hour later” to “OFF 10 hours later”. After the clock timer
setting, the remaining time is displayed with progress of time in the unit of hour.
(b) OFF timer
Time to turn OFF the air-conditioner can be set in the unit of 10 minutes.
(c) ON timer
Time to turn ON the air-conditioner can be set. Indoor temperature can be set simultaneously.
(d) Weekly timer
Timer operation (ON timer, OFF timer) can be set up to 4 times a day for each weekday.
(e) Timer operations which can be set in combination
Timer
OFF timer
ON timer
Weekly timer
Timer



OFF timer



ON timer



Weekly timer



Note (1) : Allowed : Not

– 3–
(4) Remote controller display during the operation stop
(a) “Centralized control ON” is displayed always on the LCD under the “Center/Remote” and “Center” modes during the
operation stop (Power ON). This is not displayed under the “Remote” mode.
(b) If this display is not shown under the “Center/Remote” mode, check if the indoor unit power switch is turned on or not.
(5) Hot start (Prevention of cold draft during heating)
At the startup of heating operation, at resetting the thermostat, during defrosting operation and at returning to heating, the
indoor fan is controlled by the indoor heat exchanger temperature (detected with ThI-R) to prevent the cold draft.
Judgment by heating start thermostat
Normal condition/Set airflow volume
Thermostat OFF Thermostat ON
Compressor OFFCompressor ON End of defrosting
Heat exchanger temp. 35˚C or higher, or after 7 minutes Heat exchanger temp. 35˚C or higher, or after 7 minutes
Defrosting start
Fan
Lo
Lo
Set airflow volume
Set airflow volume
Indoor heat exchanger temp. (˚C)
Indoor heat exchanger temp. (˚C)
35
35 45
25 35
Indoor heat exchanger temp. (˚C)
Set airflow volume
Fan
OFF
Lo
25 35 45
Set airflow volume
Fan
OFF
Indoor heat exchanger temp. (˚C)
Fan
Lo
（1）
Note (1) Heating preparation is displayed during the hot start (when the compressor is operating and the indoor fan does not provide the set airow volume).
(6) Hot keep
Hot keep control is performed at the start of the defrost control.
(a) Control
1) When the indoor heat exchanger temperature (detected with ThI-R1 or R2) drops to 35°C or lower, indoor fan is
changed to the lower tap at each setting.
2) During the hot keep operation, the louver horizontal control signal is transmitted.
(b) Ending condition
When the indoor fan is at the lower tap at each setting, it returns to the set airow volume as the indoor heat exchanger
temperature rises to 45°C or higher.
(7) Fan control during the heating thermostat OFF
When the heating thermostat is turned OFF, the setting of the fan control is selectable with using the indoor function of wired
remote controller [Heating fan control].
(a) Low speed (Factory default)
If the indoor heat exchanger temperature drops 35°C or lower with the heating thermostat OFF, the indoor fan operate at
the lower speed tap at each setting.
(b) Set airow volume
Even if the indoor heat exchanger temperature drops 35°C or lower with the heating thermostat OFF, the indoor fan
continues to run at the set airow volume.
(c) Intermittent operation
If the indoor heat exchanger temperature drops 35°C or lower with the heating thermostat OFF, the indoor fan operates at
the lower speed tap at each setting and, when the indoor heater exchanger temperature drops 25°C or lower, the indoor fan
stops for 5 minutes. Then the fan runs at the slow speed tap for 2 minutes, and the judgment is made by the thermostat.
(d) Stop
If the indoor heat exchanger temperature drops 35°C or lower with the heating thermostat OFF, the indoor fan is turned
OFF. The same applies also when the remote controller sensor is effective.

– 4–
(8) Filter sign
As the operation time (when ON/OFF switch is at ON) accumulates to 180 hours (1), “Filter cleaning” is displayed on the
remote controller. (This is also displayed when the unit is in trouble and under the centralized control, regardless of ON/OFF)
Note (1) Time setting for the lter sign can be made as shown below using the indoor function of wired remote controller “Filter sign setting”. (It is set at 1 at the
shipping from factory.)
Filter Sign Setting
Setting 1
Setting 2
Setting 3
Setting 4
Function
Setting time: 180 hrs (Factory default)
Setting time: 600 hrs
Setting time: 1,000 hrs
Setting time: 1,000 hrs (Unit stop)
(2)
(2) After the setting time has elapsed, the “Filter cleaning” is displayed and, after operating for 24 hours further (counted also during the stop), the unit stops.
(9) Auto swing control [Applicable model: FDT, FDTC, FDTW, FDTS, FDTQ (Excepted duct panel model) FDK
and FDE]
(a) Louver control
(i) Press the [Louver] button to operate the swing louver when the air conditioner is operating.
“Auto wind direction” is displayed for 3 seconds and then the swing louver moves up and down continuously.
(ii) To x the swing louver at a position, press one time the [Louver] button while the swing louver is moving so that
four stop positions are displayed one after another per second.
When a desired stop position is displayed, press the [Louver] button again. The display stops, changes to show the
“Louver stop” for 5 seconds and then the swing louver stops.
(iii) Louver operation at the power on
The louver swings one time automatically (without operating the remote controller) at the power on.
This allows inputting the louver motor (LM) position, which is necessary for the microcomputer to recognize the
louver position.
Note (1) If you press the Louver button, the swing motion is displayed on the louver position LCD for 10 second. The display changes to the “Auto wind
direction” display 3 seconds later.
(b) Automatic louver level setting during heating
While hot start operation and heating thermostat OFF operation, the louver keeps the level position (In order to prevent
the cold draft) whether the auto swing switch is operated or not (auto swing or louver stop), The louver position display
LCD continues to show the display which has been shown before entering this control.
(c) Louver-free stop control
When the louver-free stop has been selected with the indoor function of wired remote controller “Louver control setting”,
the louver motor stops when it receives the stop signal from the remote controller. If the auto swing signal is received
from the remote controller, the auto swing will start from the position where it was before the stop.
Note (1) When the indoor function of wired remote controller “Louver control setting” has been switched, switch also the remote control function “Louver
control setting” in the same way.
(10) Compressor inching prevention control
(a) 3-minutes timer
When the compressor has been stopped by the thermostat, remote controller operation switch or anomalous condition, its
restart will be inhibited for 3 minutes. However, the 3-minute timer is invalidated at the power on.
(b) 3-minutes forced operation timer
• Compressor will not stop for 3 minutes after the compressor ON. However, it stops immediately when the thermostat is
turned OFF by the stop command by means of the ON/OFF switch or the change of operation mode.
• If the thermostat is turned OFF during the forced compressor operation in heating mode, the louver position (with the
auto swing) is returned to the level position.
Note (1) The compressor stops when it has entered the protective control.

– 5–
(11) Drain motor (DM) control [Applicable type: FDT, FDTC, FDTW, FDTS, FDTQ, FDUM, FDQS and FDU90～140]
(a) Drain motor (DM) start operation at the same time when compressor ON at cooling and dehumidifying mode and
keeps operating for 5 minutes after operation stop, the anomalous stop, thermostat OFF and switching from cooling or
dehumidifying operation to fan or heating operation.
Stop (1)
Indoor unit operation mode
Control A
Control B
Compressor ON
Compressor OFF
Cooling Dehumidifying HeatingFan(2) Note (1) Including the stop from cooling, dehumidifying,
fan and heating operation and the anomalous stop.
(2) Including the “Fan” operation according to the
mismatch of operation modes.
(i) Control A
1) Iftheoatswitchdetectsanyanomalousdrainingcondition,theunitstopswiththeanomalousstop(displaysE9)
and the drain pump starts.
2) Thedrainmotorkeepsoperatingwhiletheoatswitchisdetectingtheanomalouscondition.
(ii) Control B
 Iftheoatswitchdetectsanyanomalousdraincondition,thedrainmotoristurnedONfor5minutes,andat10seconds
afterthedrainmotorOFFitcheckstheoatswitch.Ifitisnormal,theunitisstoppedunderthenormalconditionor,if
thereis any anomalouscondition,E9isdisplayedand thedrainmotoristurnedON.(The ONconditionismaintained
during the drain detection.)
(b) Drain motor (DM) interlock control
(i) Start conditions
Depending on the function setting of the remote controller, the drain motor is turned ON under either one of the
following conditions.
1) During heating operation (Both the thermostat ON/OFF)
2) During heating operation (Both the thermostat ON/OFF) + Fan operation
3) Fan operation
(ii) Stop conditions
The drain motor is turned OFF 5 minutes after the stop of operations 1) to 3) above.
(12) Operation check/drain pump test run operation mode
(a) If the power is turned on when the dip switch (SW7-1) on the indoor PCB is ON state, it enters the mode of operation
check/drain pump test run. It is ineffective (prohibited) to change the switch after turning power on.
(b) Whenthecommunicationwiththeremotecontrollerhasbeenestablishedwithin60secondsafterturningpoweronbythe
dip switch (SW7-1) ON, it enters the operation check mode. Unless the remote controller communication is established, it
enters the drain pump test run mode.
Note (1) To select the drain pump test run mode, disconnect the remote control connector (CNB) on the indoor PCB to shut down the remote controller
communication.
(c) Operation check mode
There is no communication with the outdoor unit but it allows performing operation in respective modes by operating the
remote controller.
(d) Drain pump test run mode
When the drain pump test run is established, only the drain pump operates, and during operation the protective functions
by the microcomputer of indoor unit become ineffective.
(13) Indoor heat exchanger anti-frost (anti-frost control)
Thermostat OFF control
1) Thermostat is turned OFF depending on the temperature detected with the heat exchanger sensor (ThI-R1, R2)
during “Cooling” and “Dehumidifying” operations.
1.0
Forced thermostat OFF
Thermostat ON OK
Heat exchanger temperature
5-min timer Temperature drop
Temperature rising
10°C
2) For 4 minutes after the thermostat ON, the forced thermostat OFF control for the anti-frost protection is not effective.
a) When temperatures detected by the heat exchanger sensors ThI-R1 and R2 are higher than the anti-frost protection
temperature at 4 minutes after the thermostat ON, the detection starts from the state of thermostat ON.
3) If the temperature detected with the heat exchanger sensor ThI-R1 or R2 has stayed below the anti-frost protection
temperature(-0.5°C)continuouslyfor5minutesafter4minutesofthethermostatONoperation,thenthethermostatis
turned OFF forcibly.
The thermostat will be turned ON if temperatures detected by ThI-Ra and R2 picked up in the thermostat ON range.
4) “Anti-frost” signal is sent to the outdoor unit.

– 6–
(14) Anomalous fan motor (FDT and FDK only)
Fan motor will be stopped with displaying “E16”, if it has detected the revolutions of 200 rpm or less continuously for 30
seconds at a rate of 4 times within 60 minutes, after starting the motor.
(15) High ceiling control [Applicable type: FDT, FDTC, FDTW, FDTS and FDE]
When the indoor unit is installed at a high ceiling, the airow volume mode control can be changed with the indoor function of
wired remote controller “High ceiling setting”.
Setting Standard (Shipping) High Ceiling 1 High Ceiling 2
Remote controller setting Hi Me Lo Hi Me Lo Hi Me Lo
Fan speed Hi Me Lo UHi1
Hi Me UHi2 Hi Me
Note (1) It is set at Standard at the shipping from factory.
(2) At the hot start, heating thermostat OFF, or other, the indoor fan operate at the slow speed tap at each setting.
(16) Hot start
Indoor fan motor control is performed at the start of heating operation.
(a) When the temperature detected with the indoor heat exchanger thermistor (ThI-R1 or ThI-R2) drops 35°C or lower, it
control the fan with AC motor: Lo and DC motor: ULo.
(b) When the heat exchanger thermistor detects 45°C or higher with the fan running at Lo/ULo, it returns to the set airow
volume.
Set airflow volume
Lo/ULo
35°C 45°C
Heat exchanger thermistor temp. (ThI-R1 or R2)
(c) On the indoor unit of which the thermostat has been turned OFF during heating operation, the fan is turned OFF if the
heat exchanger thermistor temperature (Thi-R1 or Thi-R2) drops 25°C or lower.
(17) Detection room temperature compensation during heating
With the standard specication, the compressor is turned ON/OFF based on the setting temperature of thermostat. However,
when the thermostat OFF is likely to occur earlier because the unit is installed in a condition that warm air tends to accumulate
near the ceiling, the setting can be changed by using the indoor function of wired remote controller “Heating room temperature
compensation”. Since the compressor is turned ON/OF at one of the setting temperature at +3, +2 or +1°C, the feeling of
heating can be improved. However, the upper limit of setting temperature is 30°C.
Operation
Setting temperature
Room temp. (deg)
–1 +1
Stop
Standard
Compressor
Operation
Setting temperature Room temp. (deg)
+4+2
Stop
With setting at +3°C
Compressor
(18) Return air temperature compensation
This is the function to compensate a difference between the detected temperature of the Return air thermistor and the measured
temperature after installation of unit.
(a) It is adjustable in the unit of 0.5°C by using the indoor function of wired remote controller “Return air thermistor
compensation”.
• +1.0°C, +1.5°C and +2.0°C • −1.0°C, −1.5°C and −2.0°C
(b) Since the compensated temperature is transmitted to the remote controller and the outdoor unit, it is controlled with the
compensated temperature.
Note (1) Compensation of detection temperature is effective for the indoor unit sensor only.
(19) External control (Remote display)/Remote operation
Always connect the wired remote controller. Otherwise, you cannot perform the remote operation.
(a) Output for external control (remote display) (Optional remote RUN/STOP monitor kit can be utilized.)
Following output connectors (CNT) are provided on the indoor control PCB. Connect the remote RUN/STOP monitor kit
and pick up respective dry contact signal.
•Operation output: Outputs DC12V relay drive signal during operation.

– 7–
• Heating output: Outputs DC12V relay drive signal during heating operation.
• Compressor ON output: Outputs DC12V relay drive signal when the compressor is operating.
•Error output: When any anomalous condition occurs, it outputs DC12V relay drive signal.
(b) Remote operation input
Remote operation inputs (switch input, timer input) connectors (CnT) are provided on the indoor control PCB.
However, the remote operation by the CnT is not effective when “Center mode” is selected with the air-conditioner.
(i)
At the shipping from factory [Indoor function of wired remote controller “External input selector” is
set at the level input.]
• Startup at the input signal to CnT OFF  ON [Edge input] … Air-conditioner ON
• Stop at the input signal to CnT ON  OFF [Edge input] … Air-conditioner OFF
*ON
ONON OFF OFF
OFF
OFF
OFF OFF
ONON
ONON
OFF
OFF
*ON
CnT input
Air-conditioner A
Air-conditioner B
(ii) When the setting is changed to the pulse input at site using the indoor unit function of wired
remote controller “External input selector”
It becomes effective only when the input signal to CnT is changed OFF➝ON and the air-conditioner operation [ON/
OFF] is inverted.
ON
ON
OFF
OFF OFF
OFF
ON
OFF
OFF
ON
ON
CnT input
Air-conditioner A
Air-conditioner B
(c) Processing of emergency stop signal
This emergency stop signal is used to stop all indoor unis connected to the same outdoor unit in emergency.
1) The emergency stop control becomes effective if the emergency stop control setting is changed to “Valid” from the
wired controller.
2) If the emergency stop [E-63] signal is received from outdoor unit, it is transmitted to the remote controller and
makes stop.
(d) Fresh air processing operation input
1) If indoor unit controller receive fresh air processing operation signal (*1) or fresh air processing stop signal from
remote controller, it output ON signal or OFF signal from CnD connector respectively.
*1. Operation switch ON at interlock setting and ventilation switch ON at non-interlock setting.
2) Output relay is DC12V option and maximum relay load is LY2F (OMRON).
3)
In case of interlock setting, if either of indoor units connected to one remote controller is in the state of anomalous stop,
the fresh air processing unit connected to that indoor unit cannot be operated. Other processing units connected to the
indoor units operating normally can be operate.
In case of non-interlock setting, processing unit can start ventilation even though the connected indoor unit is in
anomalous stop.
4) In case of interlock setting if indoor unit stops, processing unit also stop.
5) In case of interlock setting if indoor unit stops with anomalous stop, processing unit also stop.
6) If indoor unit is started or stopped from center console, processing unit can start or stop in case of interlock setting,
but it keep stopping in case of non-interlock setting.
7) Interlock or non-interlock can be set only on the remote controller.
(20) Dip switch function
Model capacity selection with SW6 0 : OFF, 1 : ON
Model P22 P28 P36 P45 P56 P71 P80 P90 P112 P140 P160 P224 P280
SW6-10100001010101
SW6-20010100110011
SW6-30001100001111
SW6-40000011111111
Note (1) ON marked with * means ON by a remote
controller switch or other.

– 8–
1.3 Operation control function by the remote controller
(1) Switching sequence of the operation mode switches of remote controller
Dehumidifying Cooling Fan Heating
(2) [CPU reset]
When the “CHECK” and “GRILL” buttons on the remote controller are pressed at the same time, this function is activated.
This function is same as power supply reset.
(3) [Power failure compensation function]
• This function becomes effective when “POWER FAILURE COMPENSATION SET” is valid by setting the remote controller
functions.
• The remote controller's status is always stored in memory, and after recovery of power, operation is resumed according to
the memory contents. However the auto swing stop position and timer mode are cancelled, but the weekly timer setting is
restored with the holiday setting through all weekdays.
By resetting the clock and cancelling the holiday setting for each weekday after recovery of power, weekly timer setting
becomes effective.
• Contents stored in memory for power failure compenstion are as follows.
Note (1) Item ➅➆ and ➇ are stored in memory regardless of whether the power failure compensation setting is valid or invalid, and silent mode setting is
cancelled regardless of whether the power failure compensation setting is valid or invalid.
➀ Running or Stopping status just before power failure
If it had been operating under OFF timer mode or simple timer mode, memorzed status is as stopping (At the
recovery of power, the timer mode is cancelled but weekly timer setting is changed to the holiday setting through all
weekdays
➁ Operation mode
➂ Fan speed mode
➃ Room temperature setting
➄ Louver auto swing/stop
However, the stop position (position 4) is cancelled and is becomes the level position (position 1).
➅ “Remote control function items”, set with the remote controller function setting (“Indoor unit function items” are
stored in the inoor unit's memory.)
➆ Upper limit value and lower limit value set by temperature setting control.
➇ Clock timer setting and weekly timer setting (Other timer settings are not sotred in memory).
[Parts layout on remote controller PCB]
X Y
SW2
SW1
A
B
M
S
親
子
SW1
SW2
 Control selector switch (SW1)
Switch Function
SW1 MMaster remote controller
SSlave remote controller
Note (1) SW2 is not normally used, so do not change the selection.