Mitsubishi Heavy Industries SRK20ZJX-S User manual

SERVICE MANUAL
Manual No.'10•SCM-SM-094
INVERTER MULTI-SPLIT SYSTEM
RESIDENTIAL AIR CONDITIONERS
(Split system, air to air heat pump type)
(OUTDOOR UNIT)
SCM40ZJ-S
SCM45ZJ-S
SCM50ZJ-S
SCM60ZJ-S
SCM71ZJ-S
SCM80ZJ-S
(INDOOR UNIT)
Wall mounted type
SRK20ZJX-S
SRK25ZJX-S
SRK35ZJX-S
SRK50ZJX-S
SRK60ZJX-S
SRK20ZJ-S
SRK25ZJ-S
SRK35ZJ-S
SRK50ZJ-S
Floor standing type
SRF25ZJX-S
SRF35ZJX-S
SRF50ZJX-S
Ceiling concealed type
SRR25ZJ-S
SRR35ZJ-S
SRR50ZJ-S
SRR60ZJ-S
Ceiling cassette-4way compact type
FDTC25VD
FDTC35VD
FDTC50VD
FDTC60VD

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CONTENTS
............................................ 30
(1) Summary ........................................................................................... 28
(1) Summary ............................................................................................. 30
(4) Defrosting operation ......................................................................... 29
(2) Operation of major functional components in heating mode .............. 28
(2) Operation of major functional components in cooling mode ............... 30
(3) Hot keep operation .......................................................................... 28
(1) SRK20～60ZJX-S,SRF and SRR series
........................................................................ 31
(2) SRK20～60ZJ-S series
...................................................................................... 31
(3) FDTC series
1.1 SRK,SRF and SRR series ................................................................... 5
1.2 FDTC series ........................................................................................ 16
1.3 Outline of heating operation ............................................................. 28
1.4 Outline of cooling operation ............................................................. 30
1.5 Outline of automatic operation ......................................................... 30
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ............... 5
(6) Air outlet selection (SRF series only) .................................................. 12
....................................................... 9
(1) Operation control function by remote controller
(5) Flap and louver control ...................................................................... 10
(4) Custom cord switching procedure
......................................................................... 9(3) Auto restart function
(2) Unit ON/OFF button ........................................................................... 8
.................................. 5
(1) Remote controller (Option parts)
............................ 19(3) Operation control function by the indoor controller
(2) Operation control function by the wired remote controller ................. 18
...................................................... 16
(7) 3D auto operation (SRK series only) .................................................. 12
(8) Timer operation .................................................................................. 13
(9) Installation location setting (SRK series only) ................................... 14
....................................................... 14
(11) Drain motor (DM) control (SRR series only) ..................................... 15
(10) Determining the operating mode
1.6 Operation permission/prohibition control ...................................... 32
by releasing the jumper wire (J3) on the indoor PCB
....................... 32(3) In the case of CnT input OFF (Operation prohibition)
(2) In the case of CnT input ON (Operation permission) ........................ 32
......................... 32
(1) The operation mode is switched over between Permission and Prohibition

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............................... 39
(12) Current safe ...................................................................................... 37
(18) Serial signal transmission error protection ....................................... 39
(11) Compressor overheat protection ...................................................... 37
(17) Regulation of outdoor air flow .......................................................... 38
(15) Indoor fan motor protection .............................................................. 38
(16) Discharge pipe sensor disconnection protection control ................. 38
(13) Current cat ....................................................................................... 38
(19) Rotor lock ........................................................................................ 39
(20) Outdoor fan motor protection ........................................................... 39
(14) Outdoor unit failure ........................................................................... 38
(21) Outdoor fan control at low outdoor temperature
.................................................. 40(22) Outdoor unit fan control at overload
1.8 Protective control function ................................................................. 33
1.7 External control (remote display)/control of input signal ............... 32
(2) Control of input signal ......................................................................... 32
(1) External control (remote display) output ............................................. 32
(7) Heating low outdoor temperature protective control
............................................................................... 36(9) Crankcase heater
.............................................................................. 37(10) Inching prevention
(8) Freezing cycle system protective control ........................................... 36
......................... 36
(1) Frost prevention control .................................................................... 33
(2) Cooling overload protective control .................................................... 33
........................................................... 34
(5) Heating high pressure control .......................................................... 35
(6) Heating overload protective control ................................................... 35
(4) Cooling low outdoor temperature protective control
(3) Cooling high pressure control
.......................... 34
2.1 SRK,SRF and SRR series ................................................................. 41
2. MAINTENANCE DATA ........................................................................... 41
(1) Cautions ........................................................................................... 41
(2) Items to check before troubleshooting ............................................. 41
...... 41
(4) Troubleshooting procedure (If the air conditioner runs)
(3) Troubleshooting procedure (If the air conditioner does not run at all)
.................. 42
(5) Self-diagnosis table .......................................................................... 43
(6) Service mode (Trouble mode access function) ............................... 44
.................. 52
(8) Phenomenon observed after shortcircuit, wire breakage on sensor
(7) Inspection procedures corresponding to detail of trouble
......... 56

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..............................................................147
3.2 Indoor units ........................................................................................119
(3) Models SCM71ZJ-S,80ZJ-S ..........................................................135
3.1 Outdoor units ......................................................................................116
(2) Models SCM50ZJ-S,60ZJ-S ..........................................................131
(1) Models SCM40ZJ-S,45ZJ-S ..........................................................127
(1) Wall mounted type (SRK) ..............................................................139
(2) Floor standing type (SRF)
.........................................................151(3) Ceiling concealed type (SRR)
.................................155(4) Ceiling cassette-4way compact type (FDTC)
2.2.1 Diagnosing of microcomputer circuit ........................................ 63
2.2.2 Troubleshooting flow .................................................................. 75
2.2 FDTC series ....................................................................................... 63
5.1 Installation of outdoor unit ............................................................127
5.2 Installation of indoor unit ..............................................................139
(11) Outdoor unit inspection points ......................................................... 59
............................................................................... 76(2) Troubleshooting
............................. 58(10) How to make sure of wireless remote controller
(1) List of troubles .................................................................................. 75
(1) Selfdiagnosis function ...................................................................... 63
(2) Troubleshooting procedure .............................................................. 66
................................................... 66
(5) Inverter checker for diagnosis of inverter output ............................. 71
(6) Outdoor unit inspection points ........................................................ 72
(4) Check of anomalous operation deta with the remote controller
(3) Troubleshooting at the indoor unit
........ 70
(9) Checking the indoor electrical equipment ....................................... 57
3. ELECTRICAL WIRINGS ........................................................................116
4. PIPING SYSTEMS ................................................................................124
5. APPLICATION DATAS .........................................................................127

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■How to read the model name
Example:
Indoor unit
SRK 20 Z
Series code
Inverter type
Product capacity
Model name SRK : Wall mounted type
SRF : Floor standing type
SRR : Ceiling concealed type
FDTC : Ceiling cassette-4 way
compact type
JX-S
Example:
Outdoor unit
SCM 60 Z
Series code
Inverter type
Product capacity
Model name
(Outdoor unit)
J-S
Capacity
Model
Floor standing type (SRF)
Outdoor unit to be combined (SCM)
20 25 35 6050
SCM40ZJ-S,45ZJ-S,50ZJ-S,60ZJ-S,71ZJ-S,80ZJ-S
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Ceiling concealod type (SRR)
■Table of models
Wall mounted type (SRK-ZJX-S)
Wall mounted type (SRK-ZJ-S)
Ceiling cassette-4way compact type
(FDTC)

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1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.1 SRK, SRF and SRR series
(1) Operation control function by remote control
4Operation section
Remote controller
SRK series
FAN SPEED button
OPERATION MODE select button
ON/OFF (luminous) button
HI POWER/ECONO button
AIR FLOW (UP/DOWN) button
SLEEP button
CLEAN switch
ON TIMER button
AIR FLOW (LEFT/RIGHT) button
3D AUTO button
ALLERGEN CLEAR button
RESET switch
OFF TIMER button
TEMPERATURE button
CANCEL button
• The above illustration shows all controls, but in practice
only the relevant parts are shown.
Each time the button is pressed, the
display is switched over in turn.
FAN SPEED button
This button changes the HIGH POWER/
ECONOMY mode.
HI POWER/ECONO button
These buttons set the indoor temperature.
(These buttons are used for setting the
current time and timer function as well.)
TEMPERATURE button
This button selects ON TIMER operation.
ON TIMER button
This button selects SLEEP operation.
SLEEP button
This switch selects the CLEAN mode.
CLEAN switch
This button cancels the ON timer, OFF
timer, and SLEEP operation.
CANCEL button
Each time the button pressed, the
display is switched over in turn.
OPERATION MODE select button
Press to start operation, press again to
stop.
This button changes the air flow (up/down)
direction.
SRR series
Air flow direction adjustment
can not be performed.
AIR FLOW (UP/DOWN) button
This button selects OFF TIMER operation.
OFF TIMER button
This switch is for resetting microcomputer
and setting time.
ACL switch
ON/OFF (luminous) button
Operation section
SRF series
4Operation section

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SRR series
4Operation section
Unit indication section
Model SRK20 ~ 60ZJX-S
Illuminates during 3D AUTO operation
TIMER light (yellow)
•
•
ON
OFF
1.5 sec.
0.5 sec.
3 sec.
1 sec.
ON
OFF
Unit ON/OFF button
This button can be used for turning on/off the unit when
remote controller is not available.
Remote controller signal receiver
RUN (HOT KEEP) light (green/blue)
Illuminates during operation.
green : except ECONO operation
blue : ECONO operation
Blinks when airflow stops due to the ‘HOT
KEEP’ and ‘CLEAN operation’.
HOT KEEP
CLEAN operation
Illuminates during TIMER operation.
3D AUTO light (green)
HI POWER light (green)
Illuminates during HIGH POWER operation.

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Model SRK20~50ZJ-S
3D AUTO light (green)
Illuminates during 3D AUTO operation.
HI POWER light (green)
Illuminates during HIGH POWER operation.
TIMER light (yellow)
Illuminates during TIMER operation.
This button can be used for turning on/off the unit when remote
control is not available.
Remote control signal receiver
Unit ON/OFF button
RUN (HOT KEEP) light (green)
Illuminates during operation.
Blinks when airflow stops due to the HOT
KEEP and CLEAN operation .
ON
OFF
1.5 sec.
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
Model SRF25~50ZJX-S
Unit display section
AIR SELECTION button
AIR OUTLET SELECTION light (green)
Illuminates during upper air outlet operation.
TIMER light (yellow)
Illuminates during TIMER operation.
This button can be used for turning on/off the unit when remote
controller is not available.
HI POWER Light (green)
Illuminates during HIGH POWER operation.
Unit ON/OFF button
Model All models
RUN (HOT KEEP) light (green)
• Illuminates during operation.
•
Blinks when airflow stops due to the ‘HOT
KEEP’
and ‘ CLEAN operation ’.
Remote controller signal receiver
1.5 sec.
ON
OFF
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
ECONO light (green)
Illuminates during ECONOMY operation.
Use this button to switch between the combination of upper and
lower air outlets and upper air outlet.

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Model SRR25~60ZJ-S
RUN (HOT KEEP) light (green)
・Illuminates during operation.
・ Blinks when airflow stops due to the ‘ HOT
KEEP ’ and ‘ CLEAN operation ’ .
ECONO light (orange)
Illuminates during ECONOMY operation.
TIMER light (yellow)
Illuminates during TIMER operation.
HI POWER light (green)
Illuminates during HIGH POWER operation.
Unit ON/OFF button
This button can be used for turning on/off the
unit when remote control is not available.
Remote control signal receiver
ON
OFF
1.5 sec.
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
Unit ON/OFF button
(2) Unit ON/OFF button
When the remote controller batteries become weak, or if the remote controller is lost or malfunctioning, this button may be used to
turn the unit on and off.
(a) Operation
Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off.
(b) Details of operation
The unit will go into the automatic mode in which it automatically determines, from indoor temperature (as detected by
sensor), whether to go into the cooling, thermal dry or heating modes.
Function
operation mode
Indoor temperature
setting
Fan speed Flap/Louver Timer Switch
Cooling About 24ºC
Auto Auto Continuous
Thermal dry About 25ºC
Heating About 26ºC
Unit ON/OFF butto
n
Unit ON/OFF button
Unit ON/OFF button
・
Model SRK20~60ZJX-S
・
Model SRK20~50ZJ-S
・
Model SRF25~50ZJX-S
・
Model SRR25~60ZJ-S

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(3) Auto restart function
(a) Auto restart function records the operational status of the air-conditioner immediately prior to be switched off by a power cut,
and then automatically resumes operations after the power has been restored.
(b) The following settings will be cancelled:
1) Timer settings
2) HIGH POWER operations
Notes (1) Auto restart function is set at on when the air-conditioner is shipped from the factory. Consult with your dealer if this function needs to be switched off.
(2) When power failure ocurrs, the timer setting is cancelled. Once power is resumed, reset the timer.
(3)
If the jumper wire (J170 or JA1) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram at right)
• ModelSRK20~60ZJX-S • Model SRK20~50ZJ-S
SRF25~50ZJX-S
SRR25~60ZJ-S
Jumper wire (J170)
Jumper wire (JA1)
(4) Custom cord switching procedure
If two wireless remote controller are installed in one room, in order to prevent wrong op eration due to mixed signals, please
modify the printed circuit board in the indoor unit’s controlbox and the remote controller using the following procedure.
Be sure to modify both boards. If only one board is modified, receiving (and operation) cannot be done.
(a) Modifying the indoor printed circuit board
Take out the printed circuit board from the control box and cut off jumper wire (J171 or JA2) using wire cutters.
After cutting of the jumper wire, take measures to prevent contact with the other the lead wires, etc.
• ModelSRK20~60ZJX-S • Model SRK20~50ZJ-S
SRF25~50ZJX-S
SRR25~60ZJ-S
Jumper wire (J171)
Jumper wire (JA2)

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(b) Modifying the wireless remote controller
1) Remove the battery.
2) Cut the jumper wire shown in the figure at right.
Cut
(5) Flap and louver control (SRK and SRF series only)
4SRK series
Control the flap and louver by AIRFLOW 
(UP/DOWN) and
(LEFT/RIGHT) button on the wireless remote controller.
(a) Flap
Each time when you press the AIRFLOW 
(UP/DOWN) button the mode changes as follows.
COOL , DRY, FAN
Remote controller
display
HEAT
Approx. 5°
Approx. 20°
Approx. 20°
Approx. 35°
Approx. 35°
Approx. 45° Approx. 75°
(Swing)
(Flap stopped)
Approx. 45°
Approx. 60°
Approx. 60°
󱓻

Angle of Flap from Horizontal
Mode SRK20~60ZJX-S
COOL , DRY, FAN
Remote controller
display
HEAT
Approx. 10°
Approx. 25°
Approx. 25°
Approx. 40°
Approx. 40°
Approx. 50° Approx. 70°
Approx. 50°
Approx. 60°
Approx. 60°

Model SRK20~50ZJ-S
(b) Louver
Each time when you press the AIRFLOW
(LEFT/RIGHT) button the mode changes as follows.
Center installation
Remote controller
display
Right end installation
Left end installation
󱓻

Angle of Louver
Left Approx. 50°
Left Approx. 50°
Left Approx. 20°
Left Approx. 45°
Center
Left Approx. 30°
Right Approx. 20°
Center
Right Approx. 50°
Right Approx. 20°
Left Approx. 20° Center Right Approx. 30° Right Approx. 45° Right Approx. 50°
(Louver stopped)
(Swing) (Spot) (Wide)

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(c) Swing
1) Swing flap
Flap moves in upward and downward
directions continuously.
2) Swing louver
Louver moves in left and right directions continuously.
Note (1) value in ( ) are for the model SRK20~50ZJ-S.
(d) Memory flap (Flap or Louver stopped)
When you press the AIRFLOW (UP/DOWN or LEFT/RIGHT) button once while the flap or louver is operating, it stops swinging
at the position. Since this angle is memorized in the microcomputer, the flap or louver will automatically be set at this angle when
the next operation is started.
(e) When not operating
The flap returns to the position of air flow directly below, when operation has stopped.
In HEAT operation In COOL, DRY, FAN operation
Approx. 20°(25°)
Approx. 75°(70°)
Approx.5°(10°)
Approx. 60°
4SRF series
Control the flap by AIRFLOW 
(UP/DOWN) button on the wireless remote controller.
(a) Flap
Each time when you press the AIRFLOW 
(UP/DOWN) button the mode changes as follows.
(b) Swing
1) Swing flap
Flap moves in upward and downward directions continuously.
(c) Memory flap (Flap stopped)
When you press the AIRFLOW button once while the flap is operating, it stops swinging at the position. Since this angle is mem-
orized in the microcomputer, the flap will automatically be set at this angle when the next operation is started.
(d) When not operating
The flap returns to the position of air flow directly below, when operation has stopped.
COOL , DRY, FAN
Remote controller
display
HEAT
Approx. 60°
Approx. 44°
Approx. 50°
Approx. 32°
Approx. 38°
Approx. 21.5° Approx. 5°
Approx. 21.5°
Approx. 12°
Approx. 12°
󱓻

Angle of Flap from Horizontal
(Swing)
(Flap stopped)
Approx.60°
Approx.12°
Approx.44°
Approx.5°
In HEAT operation In COOL, DRY, FAN operation
Approx. 45°
Approx. 75°
Approx.
5°
Approx. 60°

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(6) Air outlet selection (SRF series only)
(a) AIR SELECTION button can switch between the combination of upper and lower air outlets and upper air
outlet. Not operable while the air conditioner is OFF.
1) Each time the AIR SELECTION button is pressed. The combination of the
upper and lower air outlets and the upper air outlet can be switched.
2) When the upper air outlet is selected, AIR OUTLET SELECTION light on
the unit display area will light green.
AIR OUTLET SELECTION
light : OFF
AIR OUTLET SELECTION
light : ON
Upper air outlet
Upper and lower air outlets
AIR SELECTION button
(b) Auto air outlet selection
1) COOL, DRY operation
a) In case both lower and upper outlets operation is selected in Cooling or Dry
operation, both outlets will be kept for sixty minutes after the start or until
indoor temperature is below the setting point. And then the air outlet will change
to the upper outlet. That state will be maintained until switch is turned off.
b) In case both outlets operation with Auto fan speed mode is selected, the upper
outlet will be kept for ten minutes after the start or until indoor temperature is
close to reaching the setting point . And then the air outlet will change to both
outlets in order to spread comfort air to every corner.
2) HEAT operation
a) In case both lower and upper outlets operation with Auto fan speed mode is
selected, the lower outlet will be kept for twenty minutes after the start or until
indoor temperature is close to reaching the setting point .And then the air outlet will
change to both outlets. That state will be maintained until the switch is turned off.
b) Automatic adjustment of lower air outlet direction prevents stirring up of
warm air and keeps optimum comfort at floor level.
(7) 3D auto operation (SRK series only)
Control the flap and louver by 3D AUTO button on the wireless remote controller.
Air flow selection and air flow direction are automatically controlled, allowing the entire indoor to efficiently conditioned.
(a) During Cooling and Heating (Including auto cooling and heating)
1) Air flow selection is determined according to indoor temperature and setting temperature.
At cooling
Air flow selection
Operation mode AUTO HI MED LO
At heating
Indoor temp. – Setting temp. >5°C Indoor temp. – Setting temp. 5°C
Setting temp. – Indoor temp. >5°C Setting temp. – Indoor temp. 5°C
HIGH POWER AUTO HI MED LO
HIGH POWER AUTO
<
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<
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2) Air flow direction is controlled according to the indoor temperature and setting temperature.
a) When 3D auto operation starts
b) When Indoor temp. – Setting temp. is
<
=
5ºC during cooling and when Setting temp. – Indoor temp. is
<
=
5ºC during
heating, the system switches to the following air flow direction control. After the louver swings left and right sym-
metrically for 3 cycles, control is switched to the control in c).
c) After the flap swings for 5 cycles, control is switched to the control in d).
d) For 5 minutes, the following air flow direction control is carried out.
e) After 5 minutes have passed, the air flow direction is determined according to the indoor temperature and setting
temperature.
(b) During DRY Operation (including auto DRY operation)
Flap
Louver
Cooling
Up/down Swing
Heating
Wide (fixed) Center (fixed)
Flap
Louver
Cooling Heating
Left/right Swing
Horizontal blowing (Fixed) Slant forwardl blowing (Fixed)
Flap
Louver
Cooling
Up/down Swing
Heating
Center (Fixed)
Wide (Fixed)
Flap
Louver
Cooling Heating
Horizontal blowing (Fixed) Slant forwardl blowing (Fixed)
Operation mode
Indoor temp. – Setting temp. 2°C
Setting temp. – Indoor temp. 2°C
At heating
At cooling
Air flow direction contorol
2°C < Setting temp. – Indoor temp. 5°C
2°C < Indoor temp. – Setting temp. 5°C Indoor temp. – Setting temp. > 5°C
Setting temp. – Indoor temp. > 5°C
The control in d) continues. Control returns to the control in b). Control returns to the control in a).
The control in d) continues. Control returns to the control in b). Control returns to the control in a).
<
=
<
=
<
=
<
=
Wide (Fixed)
Flap
Air flow selection
Louver
According to DRY operation.
Horizontal blowing (Fixed)
(b) Sleep timer operation
Pressing the SLEEP button causes the temperature to be controlled with respect to the set temperature.
(8) Timer operation
(a) Comfortable timer setting (ON timer)
(c) OFF timer operation
The Off timer can be set at a specific time (in 10-minute units) within a 24-hour period.
If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode
operation is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value
of 15 minutes and the relationship between the indoor temperature at the setting time (temperature of room temperature sensor)
and the setting temperature.

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(9) Installation location setting (SRK series only)
When the indoor unit is installed at the end of a room, control the air flow direction so that it is not toward the side walls. If you
set the remote controller installation position, keep it so that the air flow is within the range shown in the following figure.
(a) Setting
1) If the air conditioning unit is running, press the ON/OFF button to stop.
The installation location setting cannot be made while the unit is running.
2) Press the AIR FLOW
(UP/DOWN) button and the
AIRFLOW
(LEFT/RIGHT) button together for 5 seconds
or more.
The installation location display illuminates.
3) Setting the air-conditioning installation location.
Press the AIR FLOW
(LEFT/RIGHT) button and adjust to the desired
location.
Each time the AIR FLOW(LEFT/RIGHT) button is pressed, the
indicator is switched in the order of:
4) Press the ON/OFF button.
The air-conditioner's installation location is set.
Press within 60 seconds of setting the installation location (while the installation location setting display illuminates).
Airflow range Airflow range Airflow range
(Left End Installation) (Center Installation) (Right End Installation)
 , 


(Center Installation) (Right End Installation) (Left End Installation)
(10) Determining the operating mode
The cooling and heating operating modes are the remote controller mode that have been previously determined.
If a mode differing from these is selected after this, the selected mode will appear in the display of the remote controller, but
only the fan will operate.
A unit
B unit
Cooling
Cooling
Fan Heating
HeatingFan
Cooling
switch
ON
Heating
switch
ON
Heating
switch
ON
Cooling
switch
ON
Heating
switch
ON
Operation Operation Operation Operation Operation
Example of operating pattern
Note (1) [ ] indicates currect operation.
First operation Second operation
Notes
Selected Mode
Cooling
Heating
Example
1
2
Remote Controller Display
Cooling
Heating
Operation
Cooling
Heating
Selected Mode
Heating
Cooling
Remote Controller Display
Heating
Cooling
• Different mode is
only fan operation.
Operation
Fan (1)
Fan
Note (1) If the display shows heating and the operation is fan, Hot Keep will operate.

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(11) Drain motor (DM) control (SRR series only)
(a) Drain motor (DM) is operated during the cooling or dehumidifying mode operations and simultaneously wity the com-
pressor ON. The DM continues to operate for 5 minutes after the operation stop, anomalous stop, thermostat stop or when
it was switched from the cooling and dehumidifying operations to the fan or heating operation.
Indoor unit operation mode
Stop (1) Cooling Dehumidifying Fan (2) Heating
Compressor ON Control A
Compressor OFF Control B
Note (1) Inciuding the stop from the cooling, dehumiditying, fan
and heating, and the anomalous stop
(2) Inciuding the “Fan” operation according to the
mismatch of operation modes
1) Control A
a) If the float switch detects any anomalous draining condition, the unit stops with the anomalous stop and the
drain pump starts. After detecting the anomalous condition, the drain motor comtinues to be ON.
b) It keeps operating while the float switch is detecting the anomalous condition.
2) Control B
If the float switch detects any anomalous drain condition, the drain motor is turned ON for 5 minutes, and at 10 sec-
onds after the drain motor OFF it checks the float switch. If it is normal, the unit is stopped under the normal mode
or, if there is any anomalous condition, displayed by the flashing of display lights and the drain motor is turned ON.
(The ON condition is maintained during the drain detection.)

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1.2 FDTC series
(1) Remote controller (Option parts)
(a) Wired remote controller
The figure 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 figure for the sake of explanation
Characters displayed with dots in the liquid crystal display area are abbreviated.
＊ All displays are described in the liguid crystal display for explanation.
The figure below shows the remote control with the cover opened.
Ventilaion display
Displayed during ventilation operation
Centeal control display
Displayed when the air conditioning system is
controlled by centralized remote control.
Timer operation display
Displays the timer operation setting.
Temperature setting buttons
These buttons are used to set the
temperature of the room.
Timer button
This button is used to set
the timer mode.
Timer setting buttons
These buttons are used to set
the timer mode and the time.
GRILL button
This button has no function.
When this button is pressed,
(Invalid Operation)
is displayed, but it does not mean a failure.
Cover
AIR CON No. button
Display the indoor unit number connected to this
remote controller.
CHECK button
This button is used at servicing.
TEST button
This button is used during test operation.
Weekly timer display
Displays the settings of the
weekly timer.
Operation setting display area
Displays setting temperature, airflow
volume, operation mode and oparation
message.
Operation/check indicator light
During oparation: Lit in green
In case of error: Flashing in red
Operation/stop button
This button is used to operate and stop
the air conditioning system.
Press the button once to operate the
system and press it once again to stop
the system.
MODE button
This button is used to change the
operation mode.
FAN SPEED button
This button is used to set the airflow
volume.
VENT button
This button is used to operate external
ventilator.
LOUVER button
This button is used to operate/stop the
swing louver.
SET button
●This button is used to fix the setting.
●This button is used to set the silent mode.
RESET button
●Press this button while making settings to go back to the
previous operation.
●This button is also used to reset the "FILTER CLEANING" display.
(Press it after cleaning the air filter)

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(b) Wireless remote controller
* All displays are described in the liquid crystal display for explanation
Indication section
Operation section
Indicates set temperature. Indicates the status of swing louver.
Indicates selected operation with .
Indicates for two seconds when FILTER
button is pressed.
Indicates when OFF-TIMER is set.
Indicates OFF-TIMER setting time. Indicates the
current time when the OFF-TIMER is not set.
When this is pressed once, the unit starts to
operate and when this is pressed once again,
it stops operating.
Used to swing the louver.
Every time this button is pressed, displays switch
as below.
Sets room temperature by pressing or button.
Sets time when setting the time.
Used to cancel the TIMER SETTINGS.
Used to reset the microcomputer.
Indicates the selected airflow volume
Indicates when ON-TIMER is set.
Indicates the ON-TIMER setting time.
Nothing displayed when ON-TIMER is
not set.
Sends signal to the air conditioner.
Every time this button is pressed, the mode is
switched as below.
Used to reset (turn off) the filter sign.
Press the button only after completing
the filter cleaning.
Sets ON TIMER operation.
Sets OFF TIMER operation.
Sets current time.

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(2) Operation control function by the wired remote controller
(a) Switching sequence of the operation mode switches of remote controller
$29 #//, &!. (%!4 !54/
(b) [CPU reset]
This functions when “CHECK” and “GRILL” buttons on the remote controller are pressed simultaneously. Operation is same
as that of the power supply reset.
(c) [Power failure compensation function]...Electric power supply failure
• This becomes effective if “Power failure compensation effective” is selected with the setting of remote controller function.
• Since it memorizes always the condition of remote controller, it starts operation according to the contents of memory no
sooner than normal state is recovered after the power failure. Although the auto swing stop position and the timer mode are
cancelled, the weekly timer setting is restored with the holiday setting for all weekdays.
After recovering from the power failure, it readjusts the clock and resets the holiday setting for each weekday so that the
setting of weekly timer becomes effective.
• Content memorized with the power failure compensation are as follows.
Note (1) Items, and are memorized regardless whether the power failure compensation is effective or not while the setting of silent mode is cancelled
regardless whether the power failure compensation is effective or not.
At power failure – Operating/stopped
If it had been operating under the off timer mode, sleep timer mode, the state of stop is memorized. (Although the
timer mode is cancelled at the recovery from power failure, the setting of weekly timer is changed to the holiday
setting for all weekdays.)
Operation mode
Airflow volume mode
Room temperature setting
Louver auto swing/stop
However, the stop position (4-position) is cancelled so that it returns to Position (1).
“Remote controller function items” which have been set with the remote controller function setting (“Indoor
function items” are saved in the memory of indoor unit.)
Upper limit value and lower limit value which have been set with the temperature setting control
Sleep timer and weekly timer settings (Other timer settings are not memorized.)
[Parts layout on remote controller PCB]
XY
SW2
SW1
A
B
M
S
親
子
SW1
SW2
Master/ slave setting when more than one remote controllers are used
A maximum of two remote controllers can be connected to one indoor unit (or one group of indoor units.)
Remote controller cord (no polarity)
Remote controller
SW1 "Master"
Switch Setting Contents
M Master remote controller
SW1 S Slave remote controller
Remote controller
SW1 "Slave"
Indoor units
Caution
When using multiple remote controllers, the following dispiays or settings
cannot be done with the slave remote controller. It is available only with
the master remote controller.
Louver position setting (set upper or lower limit of swinging range)
Setting indoor unit functions
Setting temperature range
Operation data display
Error data display
Silent mode setting
Test operation of drain pump
Remote controller sensor setting
Master
Slave
SW1
SW2
SW1 Board
Upper
Lower
Set SW1 to “Stave” for the slave remote controller. It was factory set to “Master” for shipment.
Note: The setting “Remote controller thermistor enabled” is only selectable with the master
remote controller in the position where you want to check room temperature.
The air conditioner operation follows the last operation of the remote controller regardless
of the master / slave setting of it.

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(3) Operation control function by the indoor controller
(a) Auto operation
If “Auto” mode is selected by the remote controller, the heating and the cooling are automatically switched according to the
difference between outdoor air temperature and setting temperature and the difference between setting temperature and return
air temperature. (When the switching of cooling mode ¢heating mode takes place within 3 minutes, the compressor does
not operate for 3 minutes by the control of 3-minute timer.) This will facilitate the cooling/heating switching operation in
intermediate seasons and the adaptation to unmanned operation at stores, etc.
Note (1) Room temperature control during auto cooling/auto heating is performed according to the room temperature setting temperature. (DIFF: ±1 deg)
(2) If the indoor heat exchanger temperature rises to 59°C or higher during
heating operation, it is switched automatically to cooling operation. In
addition, for 1 hour after this switching, the heating operation is not
performed, regardless of the temperature shown at right.
Room temperature setting temperature
+3-3
Cooling operation
Heating operation
Room temperature (detected with ThI-A) [deg]
5956
Heating operation stopped (cooling)
Heating OK
Indoor heat exchanger temperature (°C)
(b) 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 unit fan
Indoor unit fan
Louver motor
Drain pump (3)











(2)




(2)



 / 
/



 / 
/×

()
()
 / 
/
/

/
/
/
Thermostat ON: 
Thermostat OFF: (2)
/
/(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 with the indoor unit function setting of the wired remote controller.
(c) Dehumidifying operation
1) When the humidity sensor is not provided
Return air temperature thermistor [ThI-A (by the remote controller when the remote controller thermistor is enabled)]
controls the indoor temperature environment simultaneously.
a) Operation is started in the cooling mode. When the difference between the return air temperature 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 unit fan tap.
b) If the return air temperature exceeds the setting temperature by 3°C during defrosting operation, the indoor unit fan
tap is raised. That tap is retained for 3 minutes after changing the indoor unit fan tap.
c) If the thermostat OFF is established during the above control, the indoor unit fan tap at the thermostat ON is retained
so far as the thermostat is turned OFF.
d) After stopping the cooling operation, the indoor unit continues to run at Lo for 15 seconds.
2) When the humidity thermistor is provided [Optional]
a) Operation starts in the cooling mode, and the target relative temperature is determined based on the setting
temperature. If the humidity detected by the humidity thermistor becomes lower than the target relative temperature,
the indoor unit fan tap is retained.
b) Anything other than a) above is same as the item 1) above.