Mitsubishi Heavy Industries FDT200VSAPVF1 User manual

SERVICE MANUAL
Manual No.'14•PAC-SM-215
MICRO INVERTER PACKAGED
AIR-CONDITIONERS
(Split system, air to air heat pump type)
CEILING CASSETTE-4WAY TYPE CEILING CASSETTE-4WAY COMPACT TYPE
DUCT CONNECTED-HIGT STATIC PRESSURE TYPE
DUCT CONNECTED-LOW/MIDDLE STATIC PRESSURE TYPE
FLOOR STANDING TYPE
CEILING SUSPENDED TYPE
V Multi System
Twin type
FDT200VSAPVF1
250VSAPVF
Twin type
FDEN200VSAPVF1
250VSAPVF
Twin type
FDUM200VSAPVF1
250VSAPVF
Twin type
FDF200VSAPVD1
250VSAPVD
(OUTDOOR UNIT)
FDC200VSA
250VSA
(INDOOR UNIT)
FDT50VF
60VF
71VF1
100VF1
125VF
FDEN50VF
60VF
71VF1
100VF1
125VF
Double twin type
FDT200VSADVF
250VSADVF
Double twin type
FDEN200VSADVF
250VSADVF
Double twin type
FDTC200VSADVF
250VSADVF
Single type
FDU200VSAVG
250VSAVG
Triple type
FDT200VSATVF1
Triple type
FDEN200VSATVF1
Triple type
FDUM200VSATVF1

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1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER .................. 4
1.1 Remote control ........................................................................................ 4
1.2 Operation control function by the wired remote control
1.3 Operation control function by the indoor control ................................ 10
..................... 7
(1) Auto operation ....................................................................................... 10
(2) Operations of functional items during cooling/heating .......................... 11
CONTENTS
(4) Timer operation ..................................................................................... 12
(5) Remote control display during the operation stop ................................. 13
(6) Hot start (Cold draft prevention at heating) ............................................ 13
(7) Hot keep ................................................................................................ 13
(8) Auto swing control ................................................................................. 14
...................................................... 17
(9) Thermostat operation ............................................................................ 15
(10) Filter sign ............................................................................................... 16
................................................. 16
(13) Drain pump abnormalities detection
(11) Compressor inching prevention control
(12) Drain pump control ................................................................................ 17
(3) Dehumidifying operation ........................................................................ 11
.................................................................. 18
.......................... 17
(16) Heating overload protection
(14) Operation check/drain pump test run operation mode
(15) Cooling, dehumidifying frost protection ................................................. 18
................................................................................ 19
....................................................................... 18
(19) High ceiling control
(17) Anomalous DC fan motor
(18)
Plural unit control - Control of 16 units group by one remote control ......... 19
......................................... 20
...... 20
(21) External input/output control (CnT or CnTA)
(20)
Abnormal temperature thermistor (retun air/indoor heat exchanger) wire/short-circuit detection
(22) Operation permission/prohibition .......................................................... 22
.............................. 23(23) Selection of cooling/heating external input function
................................................... 24
............................................................... 24
(26) Return air temperature compensation
(24) Fan control at heating startup
(25)
Room temperature detection temperature compensation during heating ........ 24
................................................. 24(27) High power operation (RC-EX1A only)
............................................ 25(28) Energy-saving operation (RC-EX1A only)
......................................................... 25(29) Warm-up control (RC-EX1A only)
....................................................... 25(30) Home leave mode (RC-EX1A only)
....................................................... 25(31) Auto temp. setting (RC-EX1A only)
.............................................. 25(32) Fan circulator operation (RC-EX1A only)
........ 25(33)
The operation judgment is executed every 5 minutes (RC-EX1A only)
................................................ 25(34) Auto fan speed control (RC-EX1A only)
.......................................... 25(35) Indoor unit overload alarm (RC-EX1A only)

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............................... 26
2. MAINTENANCE DATA ..................................................................................... 36
2.1 Diagnosing of microcomputer circuit .................................................... 36
(1) Selfdiagnosis function ............................................................................ 36
(2) Troubleshooting procedure .................................................................... 39
(3) Troubleshooting at the indoor unit ........................................................ 39
(4) Troubleshooting at the outdoor unit ...................................................... 49
(5) Check of anomalous operation data with the remote control ................ 55
(6)
Power transistor module (including the driver PCB) inspection procedure ...... 57
(7) Inverter checker for diagnosis of inverter output ................................... 58
(8) Outdoor unit control failure diagnosis circuit diagram .......................... 59
................................................................................ 61
(1) List of troubles ....................................................................................... 61
(2) Troubleshooting .................................................................................... 62
2.2 Troubleshooting flow
3. ELECTRICAL WIRING ..................................................................................... 111
(1) Indoor units ............................................................................................ 111
(2) Outdoor units .........................................................................................119
1.4 Operation control function by the outdoor control
(1) Determination of comressor speed (frequency) .......................................26
(2) Compressor start control ..........................................................................26
(3) Compressor soft start control ...................................................................27
(4) Outdoor unit fan control ............................................................................27
(5) Defrosting .................................................................................................29
(6)
Protective control/anomalous stop control by compressor,s number of revolutions ..........30
(7) Silent mode .............................................................................................34
(8) Test run .....................................................................................................34
(9) Pump-down control ...................................................................................34
...........................................35(10) Base heater ON/OFF output control (option)
......................................................................................126
5. APPLICATION DATA
4. PIPING SYSTEM ..............................................................................................121
5.1 Installation of indoor unit ........................................................................126
(1) Ceiling cassette-4way type (FDT) .........................................................126
........................................157
(7) Effective range of cool/hot wind (Reference)
5.2 Electric wiring work installation ..............................................................158
5.4 Installation of outdoor unit ......................................................................180
5.5 Method for connecting the accessory pipe ............................................188
(1) FDT, FDTC, FDEN, FDU, FDUM series .................................................158
(2) FDF series ..............................................................................................162
5.6 Instructions for branching pipe set (DIS-WA1,WB1,TA1,TB1) ..............192
5.3 Installation of wired remote control (option) ..........................................166
(3) Ceiling suspended type (FDEN) ............................................................139
(2) Ceiling cassette-4way compact type (FDTC) .........................................133
(5) Duct connected-Low / Middle static pressure type (FDUM) ..................148
(4) Duct connected-High static pressure type (FDU) .................................143
(6) Floor standing type (FDF) .....................................................................153

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How to read the model name
FDT : Ceiling cassette-4way type
FDF : Floor standing type
FDTC : Ceiling cassette-4way compact type
FDEN : Ceiling suspended type
FDU : Duct connected-High static pressure type
FDUM : Duct connected-Low/Middle static pressure type
Example: FDT 200 VSA P VF1
Series code
P : Twin type
: Single type
T : Triple type
D : Double-twin type
Applicable power source...See the specification
Product capacity
Model name
FDC : Outdoor unit
(blank)
............................... 26
2. MAINTENANCE DATA ..................................................................................... 36
2.1 Diagnosing of microcomputer circuit .................................................... 36
(1) Selfdiagnosis function ............................................................................ 36
(2) Troubleshooting procedure .................................................................... 39
(3) Troubleshooting at the indoor unit ........................................................ 39
(4) Troubleshooting at the outdoor unit ...................................................... 49
(5) Check of anomalous operation data with the remote control ................ 55
(6)
Power transistor module (including the driver PCB) inspection procedure ...... 57
(7) Inverter checker for diagnosis of inverter output ................................... 58
(8) Outdoor unit control failure diagnosis circuit diagram .......................... 59
................................................................................ 61
(1) List of troubles ....................................................................................... 61
(2) Troubleshooting .................................................................................... 62
2.2 Troubleshooting flow
3. ELECTRICAL WIRING ..................................................................................... 111
(1) Indoor units ............................................................................................ 111
(2) Outdoor units .........................................................................................119
1.4 Operation control function by the outdoor control
(1) Determination of comressor speed (frequency) .......................................26
(2) Compressor start control ..........................................................................26
(3) Compressor soft start control ...................................................................27
(4) Outdoor unit fan control ............................................................................27
(5) Defrosting .................................................................................................29
(6)
Protective control/anomalous stop control by compressor,s number of revolutions ..........30
(7) Silent mode .............................................................................................34
(8) Test run .....................................................................................................34
(9) Pump-down control ...................................................................................34
...........................................35(10) Base heater ON/OFF output control (option)
......................................................................................126
5. APPLICATION DATA
4. PIPING SYSTEM ..............................................................................................121
5.1 Installation of indoor unit ........................................................................126
(1) Ceiling cassette-4way type (FDT) .........................................................126
........................................157
(7) Effective range of cool/hot wind (Reference)
5.2 Electric wiring work installation ..............................................................158
5.4 Installation of outdoor unit ......................................................................180
5.5 Method for connecting the accessory pipe ............................................188
(1) FDT, FDTC, FDEN, FDU, FDUM series .................................................158
(2) FDF series ..............................................................................................162
5.6 Instructions for branching pipe set (DIS-WA1,WB1,TA1,TB1) ..............192
5.3 Installation of wired remote control (option) ..........................................166
(3) Ceiling suspended type (FDEN) ............................................................139
(2) Ceiling cassette-4way compact type (FDTC) .........................................133
(5) Duct connected-Low / Middle static pressure type (FDUM) ..................148
(4) Duct connected-High static pressure type (FDU) .................................143
(6) Floor standing type (FDF) .....................................................................153

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⑤LCD display (With backlight)
④Operation lamp
This lamp lights in green (yellow-green) during
operation. It changes to red if any error occurs.
⑥USB port (mini-B)
USB connector (mini-B) allows connecting to a
personal computer.
For operating methods, refer to the instruction
manual attached to the software for personal
computer (eco-touch remote control RC-EX1,
utility software).
②switch (High Power switch)
Pushing this button starts the high power
operation.
A tap on the LCD lights the backlight.
The backlight turns off automatically if there is no
operation for certain period of time.
Lighting period of the backlight lighting can be
changed.
If the backlight is ON setting, when the screen
is tapped while the backlight is turned off, the
backlight only is turned on.(Operations with
switches ①,②and ③are excluded.)
③switch (Energy Saving switch)
Pushing this button starts the energy-saving
operation.
⑬Fan speed change button
Displays the fan speed which is selected currently.
Tap this button to change the fan speed.
⑨Menu button
When setting or changing other than the following
⑩-⑭, tap the menu button.When menu items are
displayed, select one and set.
⑫Flap direction button
Displays the flap direction which is selected currently.
Tap this button to change the flap direction.
⑦Clock, R/C name display
Displays the current time and
the name of R/C
⑪Change set temp button
Displays the temperature which
is set currently.Tap this button
to change the set temperature.
⑩Change operation mode button
Displays the operation mode which
is selected currently. Tap this button
to change the operation mode.
⑭Timer button
Displays simplified contents of the
timer which is set currently.
(When two or more timers are set,
contents of the timer which will be
operated immediately after is
displayed.)
Tap this button to set the timer.
①switch (Run/Stop switch)
One push on the button starts operation
and another push stops operation.
⑧Icon display
Each icon is displayed when one of following settings
is going on.(It is referring to the following figure for
details.)
⑮Message display
Status of air-conditioner operation and messages of
the R/C operations etc.are displayed.
When the demand control
is effective.
When setting is made
from the sub R/C.
When the central control
(Option) is running.
When the periodical
inspection is necessary.
During the ventilation
operation
When ”filter sign” is up.
When the Permission/
Prohibition setting is made.
When the peak-cut timer is setWhen the weekly timer
is set.
⑧Icon display
Each icon is displayed when one of following settings is going on.
Touch panel system, which is operated by tapping the LCD screen with a finger, is employed for any operations
other than the ①Run/Stop, ②High power and ③Energy-saving switches.
All icons are shown for the sake of explanation.
Model RC-EX1A
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.1 Remote control
(1) Wired remote control

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(1) Wired remote control
Model RC-E5
The figure below shows the remote control 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 liquid crystal display for explanation.
The figure below shows the remote control with the cover opened.
Ventilaion display
Displayed during ventilation operation
Central 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.
ESP button
This button is used to
select the auto static
pressure adjustment mode.
Cover
AIR CON No. button
Display the indoor unit number connected to this
remote control.
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 operation : 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
●If you press this button while making settings, you can 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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(2) Wireless remote control
* 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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Cooling Fan
Dry Heating
Auto
(1) Switching sequence of the operation mode switches of remote control
(a) Tap the change operation mode button on the TOP screen.
(b) When the change operation mode screen is displayed, tap the button of desired mode.
(c) When the operation mode is selected, the display returns to the TOP screen.
Icons displayed have the following meanings.
Notes(1) Operation modes which cannot be selected depending on combinations of indoor unit and
outdoor unit are not displayed.
Notes(2) When the Auto is selected, the cooling and heating switching operation is
performed automatically according to indoor and outdoor temperatures.
(2) CPU reset
Reset CPU from the remote control as follows.
(3) Power failure compensation function (Electric power source failure)
Enable the Auto-restart function from the remote control as follows.
①Tap the Menu button
on the TOP screen.
②,③ Main menu screen is displayed.
Tap the “Service & Maintenance” on the menu screen.
④Display the service
password input screen.
Enter the service password
(4-digit number).
①TOP screen ②Menu screen 1 ③Menu screen 3 ④Service password input
①Tap the Menu button
on the TOP screen.
②,③ Main menu screen is displayed.
Tap the “Service & Maintenance” on the menu screen.
④Display the service
password input screen.
Enter the service password
(4-digit number).
①TOP screen ②Menu screen 1 ③Menu screen 3 ④Service password input
⑤
Service & maintenance menu 1
⑥ Service & maintenance menu 2
⑤,⑥ Service & maintenance menus are displayed.
⑦Special settings
⑦Special settings
CPU reset : Microcomputers of IU
and OU connected are reset
(State of restoration after
power failure).
⑧CPU reset
All microcomputers on the R/C operated,
other R/Cs, IUs and OUs are reset (State
of restoration after power failure).
Tap [Yes] to reset CPU
⑤,⑥,⑦Display the R/C setting menu screens.
⑤R/C setting menu 1 ⑥R/C setting menu 2 ⑦R/C setting menu 3 ⑱Auto-restart
Enable : It returns to the state be fore the power
source failure as soon as the power is
restored (After the end of the primary
control at the power on).
Disable : It stops after the restoration of power
source, regardless the state of operation
before the power failure.
⑱Auto-restart
Set the state of operation to be started when the
power source is restored after a power failure.
⑧CPU reset
CPUreset
Restartafterreset
IfOK,
 tap ［ Set. ］
Model RC-EX1A
1.2 Operation control function by the wired remote control

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• Since it memorizes always the condition of remote control, 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 (f), (g) and (h) 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.
(a) 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.)
(b) Operation mode
(c) Airowvolumemode
(d) Room temperature setting
(e) Louver auto swing/stop
However, the stop position (4-position) is cancelled so that it returns to Position (1).
(f) “Remote control function items” which have been set with the remote control function setting (“Indoor function
items” are saved in the memory of indoor unit.)
(g) Upper limit value and lower limit value which have been set with the temperature setting control
(h) Sleep timer and weekly timer settings (Other timer settings are not memorized.)

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Model RC-E5
(1) Switching sequence of the operation mode switches of remote control
$29 #//, &!. (%!4 !54/
(2) CPU reset
This functions when “CHECK” and “ESP” buttons on the remote control are pressed simultaneously. Operation is same as that
of the power source reset.
(3) Power failure compensation function (Electric power source failure)
• This becomes effective if “Power failure compensation effective” is selected with the setting of remote control function.
• Since it memorizes always the condition of remote control, 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 (f), (g) and (h) 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.
(a) 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.)
(b) Operation mode
(c) Airowvolumemode
(d) Room temperature setting
(e) Louver auto swing/stop
However, the stop position (4-position) is cancelled so that it returns to Position (1).
(f) “Remote control function items” which have been set with the remote control function setting (“Indoor function
items” are saved in the memory of indoor unit.)
(g) Upper limit value and lower limit value which have been set with the temperature setting control
(h) Sleep timer and weekly timer settings (Other timer settings are not memorized.)
[Parts layout on remote control PCB]
XY
SW2
SW1
A
B
M
S
親
子
SW1
SW2
Master/ slave setting when more than one remote controls are used
A maximum of two remote controls can be connected to one indoor unit (or one group of indoor units.)
Remote control cord (no polarity)
Remote control
SW1 "Master"
Switch Setting Contents
M Master remote control
SW1 S Slave remote control
Remote control
SW1 "Slave"
Indoor units
Note (1) Don’t change SW2 because it is not used normally.
Caution
When using multiple remote controls, the following dispiays or settings
cannot be done with the slave remote control. It is available only with
the master remote control.
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 control sensor setting

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(1) Auto operation
(a) If “Auto” mode is selected by the remote control, 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 (ATM corner of bank).
Notes (1) Temperature range of switching cooling/heating mode can be changed by RC-EX1A from ±1.0 ～ ±4.0.
(2) Room temperature control during auto cooling/auto heating is performed
according to the room temperature setting temperature. (DIFF: ±1 deg)
(3) 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) The following automatic controls are performed other than (a) above.
(i) Cooling or heating operation mode is judged according to the conditions of the "Judgment based on Setting temperature +
Cooling select temperature and Indoor return air temperature" and the "Judgment based on Outdoor temperature".
1) 
In "Setting temperature - Cooling select temperature < Indoor return air temperature" and "Outdoor temperature/Cooling < Outdoor
return air temperature" ⇒Operation mode: Cooling
2) 
"Setting temperature + Heating select temperature > Indoor return air temperature" and "Outdoor temperature/Heating >
Outdoor air temperature" ⇒Operation mode: Heating
3) The outdoor air temperature of the above judgment conditions is sampled at every 10 minutes.
4) In the range where the above cooling and heating zones are overlapped ⇒Forced thermostat OFF
Indoor return air temperature (℃)
Outdoor air temperature (℃)
24 2612 14 16 18 28 3020 22
12
26
24
22
20
18
16
14
30
28
Heating
Cooling
Forced thermostat OFF
Forced thermostat
OFF
Forced
thermostat OFF
Outdoor temperature/Heating
Outdoor temperature/Cooling
Cooling select temperature Heating select temperature
Setting temperature
1.3 Operation control function by the indoor control

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(ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment based on
Room temperature/Cooling or Heating and Outdoor temperature/Cooling or Heating".
1)  In case of "Room temperature/Cooling < Indoor return air temperature" and "Outdoor temperature/Cooling < Outdoor air tem-
perature" ⇒Operation mode: Cooling
2)  In case of "Room temperature/Heating > Indoor return air temperature" and "Outdoor temperature /Heating > Outdoor air tem-
perature" ⇒Operation mode: Heating
3) The outdoor air temperature of the above judgment conditions is sampled at every 10 minutes.
4) In the range where the above cooling and heating zones are overlapped ⇒Forced thermostat OFF
Forced thermostat
OFF
Forced thermostat
OFF
Room temperature/Cooling Room temperature/Heating
Outdoor air temperature (℃)
Indoor return air temperature (℃)
Outdoor temperature/Heating
Outdoor temperature/Cooling
12
26
24
22
20
18
16
14
30
28
24 2612 14 16 18 28 3020 22
Forced thermostat OFF Cooling
Heating
(2) Operations of functional items during cooling/heating
Cooling Heating
Dehumidifying
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
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 control.
(3) Dehumidifying operation
Return air temperature thermistor [ThI-A (by the remote control when the remote control 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 dehumidifying 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.

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(4) Timer operation
(a) RC-EX1A
(i) Sleep timer
Set the time from the start to stop of operation. The time can be selected in the range from 30 to 240 minutes (in the
unit of 10-minute).
Note (1) Enable the “Sleep timer” setting from the remote control. If the setting is enabled, the timer operates at every time.
(ii) Set OFF timer by hour
Set the time to stop the unit after operation, in the range from 1 to 12 hours (in the unit of hour).
(iii) Set ON timer by hour
Set the time to start the unit after the stop of operation, in the range from 1 to 12 hours (in the unit of hour). It is
allowed also to set simultaneously the indoor temperature, operation mode, air flow rate and warm-up enabled/
disabled.
(iv) Set ON timer by clock
Set the time to start operation. The time can be set in the unit of 5-minute. This setting can be activated only once
orateverytime.Itisallowedalsotosetsimultaneouslytheindoortemperature,operationmode,airowrateand
warm-up enabled/disabled.
Note (1) It is necessary to set the clock to use this timer.
(v) Set OFF timer by clock
Set the time to stop operation. The time can be set in the unit of 5-minute. This setting can be activated only once or
at every time.
Note (1) It is necessary to set the clock to use this timer.
(vi) Weekly timer
Set the ON or OFF timer for a week. Up to 8 patterns can be set for a day. The day-off setting is provided for
holidays and non-business days.
Note (1) It is necessary to set the clock to use the weekly timer.
(vii) Combination of patterns which can be set for the timer operations
























Note (1) :Allowed : Not
Sleep time
Sleep time
Set OFF timer by hour
Weekly timer
Set ON timer by hour Set OFF timer by clock Set ON timer by clock
Set OFF timer by hour
Set ON timer by hour
Set OFF timer by clock
Set ON timer by clock
Weekly timer
(b) RC-E5
(i) Sleep 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 sleep timer
setting, the remaining time is displayed with progress of time in the unit of hour.
(ii) OFF timer
Time to turn OFF the air-conditioner can be set in the unit of 10 minutes.
(iii) ON timer
Time to turn ON the air-conditioner can be set. Indoor temperature can be set simultaneously.
(iv) Weekly timer
Timer operation (ON timer, OFF timer) can be set up to 4 times a day for each weekday.
(v) 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
Item
Item
(2) Since the ON timer, sleep timerand OFF timer are set in parallel, when the times to turn ON and OFF the air-conditioner are duplicated,
the setting of the OFF timer has priority.

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(5) Remote control display during the operation stop
When the operation is stopped (the power source is turned ON), it displays preferentially the “Room temperature”, “Center/
Remote”, “Filter sign”, “Inspection” and “Timer operation”.
(6) Hot start (Cold draft prevention at heating)
(a) Operating conditions
When either one of following conditions is met, the hot start control is performed.
(i) From stop to heating operation
(ii) From cooling to heating operation
(iii) From heating thermostat OFF to ON
(iv) After completing the defrost control (only on units with thermostat ON)
(b) Contents of operation
(i) Indoor fan motor control at hot start
1) Within 7 minutes after starting heating operation, the fan mode is determined depending on the condition of
thermostat (fan control with heating thermostat OFF).
a) Thermostat OFF
i) Operates according to the fan control setting at heating thermostat OFF.
ii) Even if it changes from thermostat OFF to ON, the fan continues to operate with the fan control at thermostat
OFF till the heat exchanger thermistor (ThI-R1 or R2, whichever higher) detects 35°C or higher.
iii) When the heat exchanger thermistor (ThI-R1 or R2, whichever higher) detects 35°C or higher, the fan
operateswiththesetairowvolume.
b) Thermostat ON
i) When the heat exchanger thermistor (ThI-R1 or R2, whichever higher) detects 25°C or lower, the fan is
turned OFF and does not operate.
ii) When the heat exchanger thermistor (ThI-R1 or R2, whichever higher) detects 25°C or higher, the fan
operates with the fan control at heating thermostat OFF.
iii) When the heat exchanger thermistor (ThI-R1 or R2, whichever higher) detects 35°C or higher, the fan
operateswiththesetairowvolume.
c) IfthefancontrolatheatingthermostatOFFissetatthe“Setairowvolume”(fromtheremotecontrol),the
fanoperateswiththesetairowvolumeregardlessofthethermostatON/OFF.
2) Once the fan motor is changed from OFF to ON during the thermostat ON, the indoor fan motor is not turned
OFF even if the heat exchanger thermistor detects lower than 25°C.
Note (1) When the defrost control signal is received, it complies with the fan control during defrosting.
3) Once the hot start is completed, it will not restart even if the temperature on the heat exchanger thermistor drops.
(ii) During the hot start, the louver is kept at the horizontal position.
(iii) When the fan motor is turned OFF for 7 minutes continuously after defrosting, the fan motor is turned ON regardless
of the temperatures detected with the indoor heat exchanger thermistors (ThI-R1, R2).
(c) Ending condition
(i) If one of following conditions is met during the hot start control, this control is terminated, and the fan is operated with
thesetairowvolume.
1) Heat exchanger thermistor (ThI-R1 or R2, whichever higher) detects 35°C or higher.
2) It has elapsed 7 minutes after starting the hot start control.
(7) Hot keep
Hot keep control is performed at the start of the defrost control.
(a) Control
(i) When the indoor heat exchanger temperature (detected with ThI-R1 or R2) drops to 35°C or lower, the speed of
indoor fan is changed to the lower tap at each setting.
(ii) During the hot keep, the louver is kept at the horizontal position.
(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.

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(8) Auto swing control
(a) RC-EX1A
(i) Louver control
1) To operate the swing louver when the air conditioner is operating, press the “Direction” button on the TOP screen of
remote control. The wind direction select screen will be displayed.
2) Toswingthelouver,touchthe“Autoswing”button.Theloverwillmoveupanddown.Toxtheswinglouverata
position, touch one of [1] - [4] buttons. The swing lover will stop at the selected position.
3) Louver operation at the power on with a unit having the louver 4-position control function
The louver swings one time automatically (without operating the remote control) at the power on.
This allows the microcomputer recognizing and inputting the louver motor (LM) position.
(ii) Automatic louver level setting during heating
At the hot start and the heating thermostat OFF, regardless whether the auto swing switch is operated or not (auto
swing or louver stop), the louver takes the level position (in order to prevent blowing of cool wind). The louver position
display LCD continues to show the display which has been shown before entering this control.
(iii) Louver free stop control
If you touch the “Menu” →“Next” →“R/C settings” buttons one after another on the TOP screen of remote control,
the “Flap control” screen is displayed. If the free stop is selected on this screen, the louver motor stops upon receipt of
the stop signal from the remote control. If the auto swing signal is received from the remote control, the auto swing will
start from the position before the stop.
(b) RC-E5
(i) Louver control
1) Press the “LOUVER” button to operate the swing louver when the air-conditioner is operating.
“SWING ” is displayed for 3 seconds and then the swing louver moves up and down continuously.
2) 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 “STOP 1 ” for 5 seconds and then the swing louver stops.
3) Louver operation at the power on with a unit having the louver 4-position control function
The louver swings one time automatically (without operating the remote control) 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
“SWING ” display 3 seconds later.
(ii) Automatic louver level setting during heating
At the hot start with the heating thermostat OFF, regardless whether the auto swing switch is operated or not (auto
swing or louver stop), the louver takes the level position (In order to prevent the cold start). The louver position display
LCD continues to show the display which has been shown before entering this control.
(iii) Louver-free stop control
When the louver-free stop has been selected with the indoor function of wired remote control “ POSITION”, the
louver motor stops when it receives the stop signal from the remote control. If the auto swing signal is received from the
remote control, the auto swing will start from the position where it was before the stop.
Note (1) When the indoor function of wired remote control “ POSITION” has been switched, switch also the remote control function “
POSITION” in the same way.

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(9) Thermostat operation
(a) Cooling
(i) Thermostat is operated with the room temperature control.
(ii) Thermostat is turned ON or OFF relative to the set room temperature as shown below.
(iii) Thermostat is turned ON when the room temperature is in the range of -1 < Set temperature < +1 at the start of cooling
operation (including from heating to cooling).
(b) Heating
(i) Thermostat is operated with the room temperature control.
(ii) Thermostat is turned ON or OFF relative to the set room temperature as shown below.
(iii) Thermostat is turned ON when the room temperature is in the range of -1 < Set point < +1 at the start of cooling opera-
tion (including from cooling to heating).
(c) Fan control during heating thermostat OFF
(i) Following fan controls during the heating thermostat OFF can be selected with the indoor function setting of the wired
remote control.
①Low fanspeed (Factory default), ②Set fan speed, ③Intermittence, ④Fan OFF
(ii) When the “Low fan speed (Factory default)” is selected, the following taps are used for the indoor fans.
・ForACmotor:Lotap
・ForDCmotor:ULotap
(iii) When the “Set fan speed” is selected, it is operated with the set fan speed also in the thermostat OFF condition.
(iv) If the “Intermittence” is selected, following controls are performed:
1) If the thermostat is turned OFF during the heating operation, the indoor unit fan motor stops.
2) IndoorfanOFFisxedfor5minutes.Afterthe5minutes,theindoorfanisoperatedatLoorULofor2minutes.
In the meantime the louver is controlled at level.
3) After operating at Lo or ULo for 2 minutes, the indoor fan moves to the state of 1) above.
4) If the thermostat is turned ON, it moves to the hot start control.
5) When the heating thermostat is turned OFF, the remote control displays the temperature detected at the fan stop
and revises the temperature later when the indoor fan changes from Lo or ULo to stop.
The remote control uses the operation data display function to display temperatures and updates values of
temperature even when the indoor fan is turned OFF.
6) When the defrosting starts while the heating thermostat is turned OFF or the thermostat is turned OFF during
defrosting, the indoor fan is turned OFF. (Hot keep or hot start control takes priority.) However, the suction
temperature is updated at every 7-minute.
7) When the heating thermostat is turned ON or the operation is changed to another mode (including stop), this
control is stopped immediately, and the operating condition is restored.
(v) When the “Fan OFF” is selected, the fan on the indoor unit of which the thermostat has been turned OFF, is turned OFF.
The same occurs also when the remote control sensor is effective.
Thermostat OFF
Set room temperature
Temperature drop
Temperature rise
-1 +1
Thermostat ON
Thermostat OFF
Heater OFF
Temperature rise
Temperature drop
Thermostat ON
Set room temperature
-1 +1
-1 +1
Heater ON
3C
◦

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(d) Fan control during cooling thermostat OFF
(i) Following fan controls during the cooling thermostat OFF can be selected with the indoor function setting of the wired
remote control.
①Low fanspeed, ②Set fan speed (Factory default), ③Intermittence, ④Fan OFF
(ii) When the “Low fan speed” is selected, the following taps are used for the indoor fans.
・ForACmotor:Lotap
・ForDCmotor:ULotap
(iii) When the “Set fan speed” is selected, it is operated with the set fan speed also in the thermostat OFF condition.
(iv) If the “Intermittence” is selected, following controls are performed:
1) If the thermostat is turned OFF during the cooling operation, the indoor unit fan motor stops.
2) IndoorfanOFFisxedfor5minutes.Afterthe5minutes,theindoorfanisoperatedatLoorULofor2minutes.
3) After operating at Lo or ULo for 2 minutes, the indoor fan moves to the state of 1) above.
4) If the thermostat is turned ON, the fan starts operation at set fan speed.
5) When the cooling thermostat is turned OFF, the remote control displays the temperature detected at the fan stop
and revises the temperature later when the indoor fan changes from Lo or ULo to stop.
By using operation data display function at wireless remote control, the temperature as displayad and the value is
updated including the fan stops.
6) When the cooling thermostat is turned ON or the operation is changed to another mode (including stop), this
control is stopped immediately, and the operating condition is restored.
(v) When the “Fan OFF” is selected, the fan on the indoor unit of which the thermostat has been turned OFF, is turned OFF.
The same occurs also when the remote control sensor is effective.
(10) Filter sign
As the operation time (Total ON time of ON/OFF switch) accumulates to 180 hours (1), “FILTER CLEANING” is displayed on
the remote control. (This is 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control“FILTERSIGNSET”.(ItissetatTYPE1
at the shipping from factory.)
Filter sign setting
TYPE 1
TYPE 2
TYPE 3
TYPE 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.
(11) Compressor inching prevention control
(a) 3-minute timer
When the compressor has been stopped by the thermostat, remote control operation switch or anomalous condition, its
restart will be inhibited for 3 minutes. However, the 3-minute timer is invalidated at the power on the electric power
source for the unit.
(b) 3-minute forced operation timer
(i) Compressor will not stop for 3 minutes after the compressor ON. However, it stops immediately when the unit is
stopped by means of the ON/OFF switch or by when the thermister turned OFF the change of operation mode.
(ii) If the thermostat is turned OFF during the forced operation control of heating compressor, 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.

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(12) Drain pump control
(a) This control is operated when the inverter frequency is other than 0 Hz during the cooling operation and automatic
cooling and dehumidifying operations.
(b) Drain pump ON condition continues for 5 minutes even when it enters the OFF range according to (i) above after turning
the drain pump ON, and then stops. The 5-minute delay continues also in the event of anomalous stop.
(c) The drain pump is operated with the 5-minute delay operation when the compressor is changed from ON to OFF.
(d) Even in conditions other than the above (such as heating, fan, stop, cooling thermostat OFF), the drain pump control is
performed by the drain detection.
(e) Following settings can be made using the indoor function setting of the wired remote control.
(i)
(ii)
(iii)
(iv)
Note (1) Values in
〔〕
are for the RC-EX1A model.
ާStandardin cooling & dryި: Drain pump is run during cooling and dry.
ާOperate in standard & heatingި: Drain pump is run during cooling, dry and heating.
ާOperate in heating & fanި: Drain pump is run during cooling, dry, heating and fan.
ާOperate in standard & fanި: Drain pump is run during cooling, dry and fan.
(13) Drain pump abnormalities detection
(a) DraindetectionswitchisturnedONorOFFwiththeoatswitch(FS)andthetimer.
[＊1]Draindetectionswitchisturned“ON”whentheoatswitch“Open”isdetectedfor3secondscontinuouslyinthe
drain detectable space.
[＊2]Draindetectionswitchisturned“OFF”whentheoatswitch“Close”isdetectedfor10secondscontinuously.
(i) It detects always from 30 seconds after turning the power ON.
1) There is no detection of anomalous draining for 10 seconds after turning the drain pump OFF.
2) Turning the drain detection switch “ON” causes to turn ON the drain pump forcibly.
3) Turning the drain detection switch “OFF” releases the forced drain pump ON condition.
Normal state
[*1] [*2]
Normal state
Drain detection switch ON
Stop (1)
Indoor unit operation mode
Control A
Control B
Compressor ON
Compressor OFF
Cooling Dry HeatingFan (2) Note (1) Including the stop from the cooling, dehumidifying, fan
and heating, 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. After detecting the anomalous condition, the drain motor continues to be ON.
2) It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
mode 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) Indoor unit performs the control A or B depending on each operating condition.
(14) Operation check/drain pump test run operation mode
(a)
If the power is turned on by the dip switch (SW7-1) on the indoor PCB when electric power source is supplied, 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 control 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 control 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 control
communication.

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(c) Operation check mode
There is no communication with the outdoor unit but it allows performing operation in respective modes by operating the
remote control.
(d) Drain pump test run mode
As the drain pump test run is established, the drain pump only operates and during the operation protective functions by
the microcomputer of indoor unit become ineffective.
(15) Cooling, dehumidifying frost protection
(a) To prevent frosting during cooling mode or dehumidifying mode operation, the of compressor speed is reduced if
the indoor heat exchanger temperature (detected with ThI-R) drops to 1.0 °C or lower at 4 minutes after the start of
compressor operation. If the indoor unit heat exchanger temperature is 1.0 °C or lower after 1 minutes, the compressor
speed is reduced further. If it becomes 2.5 °C or higher, the control terminates. When the indoor heat exchanger
temperature has become as show below after reducing the compressor speed, it is switched to the fan operation. For the
selection of indoor fan speed, refer to item 2).
101.0
Indoor heat exchanger temperature (°C)
Fan operation
Cooling operation
SRC40~60
FDC100~140
Model Symbol A
4
4
1
1
1.0
1.0
2.5
2.5
B C D
(b) Selection of indoor fan speed
If it enters the frost prevention control during cooling operation (excluding dehumidifying), the indoor unit fan speed is
switched.
(i) In the case of FDT, FDU, FDUM only.
1) When the indoor return air detection temperature (detected with ThI-A) is 23°C or higher and the indoor heat
exchanger temperature (detected with ThI-R) detects the compressor frequency drop start temperature A°C+1°C,
of indoor unit fan speed is increased by 20min-1.
2) If the phenomenon of 1) above is detected again after the acceleration of indoor unit fan, indoor unit fan speed
is increased further by 20min-1.
Note (1) Indoor unit fan speed can be increased by up to 2 taps.
• Compressor frequency drop start temperature
Symbol
Item A
Temperature - Low (Factory default) 1.0
Temperature - High 2.5
Note (1) Frost prevention temperature setting can be selected with the indoor unit function setting of the wired remote control.
(16) Heating overload protection
(a) If the indoor heat exchanger temperature (detected with ThI-R) at 63°C or higher is detected for 2 seconds continuously,
the compressor stops. When the compressor is restarted after a 3-minute delay, if a temperature at 63°C or higher is
detected for 2 seconds continuously within 60 minutes after initial detection and if this is detected 5 times consecutively,
the compressor stops with the anomalous stop (E8). Anomalous stop occurs also when the indoor heat exchanger
temperature at 63°C or higher is detected for 6 minutes continuously.
56 63
Indoor heat exchanger temperature (°C)
Compressor ON
Compressor OFF
(b) Indoor unit fan speed selection
If, after second detection of heating overload protection up to fourth, the indoor fan is set at Me and Lo taps when the
compressor is turned ON, the indoor fan speed is increased by 1 tap.
(17) Anomalous DC fan motor
(a) After starting the fan motor, if the fan motor speed is 200min-1 or less is detected for 30 seconds continuously and 4 times
within 60 minutes, then fan motor stops with the anomalous stop (E16).
(b) If the fan motor fails to reach at -50(FDU: -500) min-1 less than the required speed, it stops with the anomalous stop (E20).

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(18) Plural unit control – Control of 16 units group by one remote control
(a) Function
One remote control switch can control a group of multiple number of unit (Max. 16 indoor units). “Operation mode”
which is set by the remote control switch can operate or stop all units in the group one after another in the order of unit
No.(1). Thermostat and protective function of each unit function independently.
Note (1) Unit No. is set by SW2 on the indoor unit control PCB. Unit No. setting by SW2 is necessary for the indoor unit only. In cases of the twin and
triple specification, it is necessary set for the master and the slave units. This can be selected by SW5. (All are set for the master unit at the
shipping from factory.)
(2) Unit No. may be set at random unless duplicated, it should be better to set orderly like 0, 1, 2…, F to avoid mistake.
(b) Display to the remote control
(i) Center or each remote control basis, heating preparation: the youngest unit No. among the operating units in the
remote mode (or the center mode unless the remote mode is available) is displayed.
(ii) Inspection display, filter sign: Any of unit that starts initially is displayed.
(iii) Confirmation of connected units
1) In case of RC-EX1A remote control
If you touch the buttons in the order of “Menu” →“Next” →“Service & Maintenance” →“IU address” on the
TOP screen of remote control, the indoor units which are connected are displayed.
2) In case of RC-E5 remote control
Pressing “AIR CON No.” button on the remote control displays the indoor unit address. If “▲” “▼” button is
pressed at the next, it is displayed orderly starting from the unit of youngest No.
(iv) In case of anomaly
1) If any anomaly occurs on a unit in a group (a protective function operates), that unit stops with the anomalous
stop but any other normal units continue to run as they are.
2) Signal wiring procedure
Signal wiring between indoor and outdoor units should be made on each unit same as the normal wiring. For the
group control, lay connect with sires wiring between rooms using terminal blocks (X, Y) of remote control.
Connect the remote control communication wire separately from the power source wire or wires of other
electric devices (AC220V or higher).
(19) High ceiling control
When sufficient air flow rate cannot be obtained from the indoor unit which is installed at a room with high ceiling, the air flow
rate can be increased by changing the fan tap. To change the fan tap, use the indoor unit function “FAN SPEED SET” on the
wired remote control.
--- -- --
PHi1 - Hi
PHi1 - Hi
PHi1 - Me
PHi1 - Me
PHi1 - Hi - Me
PHi1 - Hi - Me
STANDARD
HIGH SPEED1
HIGH SPEED2
FAN SPEED SET
Hi - Lo
Hi - Lo
Hi - Lo
Hi - Me Except FDT
Except FDT
Only FDT
Only FDT
Only FDT
Hi - Me
Hi - M
Hi - Me - Lo
Hi - Me - Lo
Hi - Me - Lo
PHi1 - PHi1 - Hi - Me
PHi2 - Hi - Me - Lo
PHi2 - PHi1 - Hi - Me
PHi1 - Hi - Me - Lo
PHi2 - Hi - Me - Lo
Indoor unit airflow setting Series
Fan tap
Notes (1) Factory default is STANDARD.
(2) At the hot-start and heating thermostat OFF, or other, the indoor unit fan is operated at the low speed tap of each setting.
(3) This function is not able to be set with wireless remote controls or simple remote control (RCH-E3)
SW2: For setting of 0 – 9, A – F
SW5: For setting of master and slave units
(See table shown at right.)
Remote control
Indoor unit
Outdoor unit
Signal wiring
between outdoor unit
and indoor units
(Master unit) (Slave unit a) (Slave unit b)
Remote control wiring
R
0 1 2 3 F
4 4 4
(Slave unit c)
4
Refrigerant piping
Master unit OFF OFF
OFF ON
SW5-1 SW5-2
ON OFF
ON ON
Slave unit a
Slave unit b
Slave unit c
Switch
Unit
SW5 setting