Mitsubishi Heavy Industries FDT40ZSXW1VH User manual

Manual No.'19・PAC-SM-302
SERVICE MANUAL
HYPER INVERTER PACKAGED
AIR-CONDITIONERS
(Split system, air to air heat pump type)
CEILING CASSETTE-4 WAY TYPE
FDT40ZSXW1VH
50ZSXW1VH
60ZSXW1VH

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'19 • PAC-SM-302
CONTENTS
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.1 Remote control (Option parts)
1.2 Operation control function by the wired remote control
1.3 Operation control function by the indoor control
(1) Auto operation
(2) Operations of functional items during cooling/heating
(4) Timer operation
(5) Hot start (Cold draft prevention at heating) ............................................ 12
(6) Hot keep .................................................................................................. 12
(7) Auto swing control ................................................................................... 13
(8) Thermostat operation
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(9) Filter sign................................................................................................. 15
(3) Dehumidifying (DRY) operation
(10) Compressor inching prevention control
(11) Drain pump control
(12) Drain pump motor (DM) control
(15) Heating overload protection
(13) Operation check/drain pump test run operation mode
(14) Cooling, dehumidifying frost protection
(18) High ceiling control
(16) Anomalous fan motor
(17)
Plural unit control - Control of 16 units group by one remote control
(20) External input/output control (CnT or CnTA)
(19) Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection
(21) Operation permission/prohibition
(23) Selection of cooling/heating external input function
(22) Temporary stop input
(28) Energy-saving operation (RC-EX3A only)
(29) Warm-up control (RC-EX3A only)
(24) Fan control at heating startup
(26) Return air temperature compensation
(27) High power operation (RC-EX3A only)
(25)
Room temperature detection temperature compensation during heating
(34) Auto fan speed control (RC-EX3A only)
(35) Indoor unit overload alarm (RC-EX3A only)
(30) Home leave mode (RC-EX3A only)
(32) Fan circulator operation (RC-EX3A only)
(33)
The operation judgment is executed every 5 minutes (RC-EX3A only)
(31) Auto temperature setting (RC-EX3A only)
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(36) Peak-cut time (RC-EX3A only)
(37) Motion sensor control (RC-EX3A only)
(1) Defrost operation
(2) Cooling overload protective control
(3) Cooling high pressure control
(4) Cooling low outdoor air temperature protective control
(5) Heating high pressure control
(6) Heating overload protective control
(7) Heating low outdoor temperature protective control
(8) Compressor overheat protection
(9) Current safe
(10) Current cut
(11) Outdoor unit failure
1.4 Operation control function by the outdoor control
(6) Inverter checker for diagnosis of inverter output
(7) Outdoor unit control failure diagnosis circuit diagram
(1) Selfdiagnosis function
(2) Troubleshooting procedure
2.1 Diagnosing of microcomputer circuit
2. MAINTENANCE DATA
(3) Troubleshooting at the indoor unit
(4) Troubleshooting at the outdoor unit
(5) Check of anomalous operation data with the remote control
(15) Outdoor fan control at low outdoor temperature
(16) Refrigeration cycle system protection
(14) Outdoor fan motor protection
(12) Serial signal transmission error protection
(13) Rotor lock
(1) List of troubles
(2) Troubleshooting
2.2 Troubleshooting flow
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3. ELECTRICAL WIRING ................................................................................... 89
4. PIPING SYSTEM ............................................................................................ 91

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'16 • PAC-T-251
④Operation lamp
① Run/Stop switch
② F1 switch③F2 switch
Touch panel system, which is operated by tapping the LCD screen with a finger, is employed
for any operations other than the ①Run/Stop, ②F1 and ③F2 switches.
One push on the button starts operation and
another push stops operation.
This switch starts operation that is set in F1/F2
function change.
This lamp lights in green(yellow-green) during
operation. It changes to red(orange) if any
error occurs.
Operation lamp luminance can be changed.
⑤LCD (With backlight)
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 ①,②
and ③are excluded.)
⑥USB port
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 (remote control utility software).
Note(1) When connecting to a personal computer, do not connect
simultaneously with other USB devices.
Please be sure to connect to the computer directly,without
going through a hub, etc.
Model RC-EX3A
1.10 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.10.1 Remote control
(1) Wired remote control
P044-055.pdf 2017/03/17 13:53:02
⑤LCD (With backlight)
③F2 switch
④Operation lamp
⑥USB port (mini-B)
①Run/Stop switch
②F1 switch
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.1 Remote control (Option parts)
(1) Wired remote control
Model RC-EX3A

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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 liguid 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 central 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, air flow
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 air flow
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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(2) Wireless remote control
Indication section
Operation section
D
C
4
5
6
1 8 9
@
B
A
3 7 2
①
OPERATION MODE display Indicates selected operation mode.
②
SET TEMP display Indicates set temperature.
SLEEP TIMER time display Indicates the amount of time remaining on the sleep timer.
Indoor function setting
number display Indicates the setting number of the indoor function setting.
③FAN SPEED display Indicates the selected air flow volume.
④UP/DOWN AIR FLOW
display Indicates the up/down louver position.
⑤LEFT/RIGHT AIR FLOW
display Indicates the left/right louver position.
⑥Clock display Indicates the current time. If the timer is set, the ON
TIMER and OFF TIMER setting times are indicated.
⑦ON/OFF TIMER display Displayed when the timer is set.
⑧ECO mode display Displayed when the energy-saving operation is active.
⑨HI POWER display Displayed when the high power operation is active.
⑩NIGHT SETBACK display Displayed when the home leave mode is active.
⑪SILENT display Displayed when the silent mode control is active.
⑫Motion sensor display Displayed when the infrared sensor control(motion sensor
control) is enabled.
⑬Anti draft setting display Displayed when anti draft setting is enabled.
⑭Child lock display Displayed when child lock is enabled.
Transmitter:Sends signal to the air-
conditioner.
1
K
7
5
2
D4
3
6
I
G
A
B
H
C
@
8
F
9
E
J
①ON/OFF button
When this is pressed once, the air-conditioner starts to
operate and when this is pressed once again, it stops
operating.
②MODE button
Every time this button is pressed, displays switch as below
(AUTO) (COOL) (HEAT)
(FAN) (DRY)
③
TEMP button Change the set temperature by pressing or button.
④FAN SPEED button The fan speed is switched in the following order: 1-speed
➞2-speed ➞3-speed ➞4-speed ➞AUTO ➞1-speed.
⑤U/D button Used to determine the up/down louver position.
⑥L/R button Used to determine the left/right louver position.
⑦3D AUTO button Used to switch whether or not to enable or disable 3D
AUTO mode.
⑧ON TIMER button Used to set the ON TIMER.
⑨OFF TIMER button Used to set the OFF TIMER.
⑩SELECT button
Used to switch the time when setting the timer or adjusting the time.
Used to switch the settings of the indoor function.
⑪SET button
Used to determine the setting when setting the timer or
adjusting the time.
Used to determine the settings of the indoor function.
When press and hold SET button ,Child Lock is enabled.
⑫CANCEL button Used to cancel the timer setting.
⑬SLEEP button Used to set the sleep timer.
⑭ECO button Pressing this button starts the energy-saving operation.
Pressing this button again cancels it.
⑮HI POWER button Pressing this button starts the high power operation.
Pressing this button again cancels it.
⑯SILENT button Pressing this button starts the silent mode control.
Pressing this button again cancels it.
⑰NIGHT SETBACK button Pressing this button starts the home leave mode.
Pressing this button again cancels it.
⑱FILTER button Pressing this button resets FILTER SIGN.
⑲
FUNCTION SETTING switch Used to set the indoor function.
⑳TIME SETUP switch Used to set the current time.
󰼼ACL switch Used to reset the microcomputer.
(2) Wireless remote control
RCN-E2

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1.2 Operation control function by the wired remote control
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Service & Maintenance
Special settings
Indoor unit capacity display
Back
Select the item.
前ページ
Previous Back
Erase IU address
CPU reset
Restore of default setting
Touch panel calibration
Special settings
Select the item.
R/C function settings
Ventilation setting
Auto-restart
Auto temp setting
Back
Select the item.
Previous
Auto fan speed
② Auto-restart
Auto-restart
Back
Select the item.
Enable
Disable
1.10.2 Operation control function by the wired remote control
●Model RC-EX3A
(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.
Cooling Fan
Dry Heating
Auto
Notes(1) Operation modes whichcannot be selected depending on combinations of indoor
unit and outdoor unit are not displayed.
(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.
TOP screen Menu Service setting Service & Maintenance Service password
The selected screen is
displayed.
The selected screen is
displayed.
① Service & Maintenance #2 ②Special settings
⇒ ⇒ ⇒
CPU reset
Microcomputers of indoor unit and outdoor unit connected are reset
(State of restoration after power failure).
(3) Power failure compensation function (Electric power source failure)
Enable the Auto-restart function from the remote control as follows.
TOP screen Menu ⇒ Service setting ⇒ R/C function settings Service password
⇒
① R/C function settings menu #3
If the unit stops during operation,
It returns to the state before the power failure as soon as the power
source is restored (After the end of the primary control at the power
on).
It stops after the restoration of power source.
Enable
Disable
●Since the status of remote control is retained in memory always, it restarts operations according to the contents of memory
as soon as the power source is restored. Although the timer mode is cancelled, the weeklytimer, peakcut timerand silent
mode timer operate according to the following contents:
・When the clock setting is valid : These timer settings are also valid.
・When the clock setting is invalid : These timer settings become “Invalid” since the clock setting is invalid.
These timer settings have to be changed to “Valid” after the timer setting.

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Clock setting check screen
Misconnection screen
●Content memorized with the power failure compensation are as follows.
Note(1) Items (f) and (g) 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.
(b) Operation mode
(c) Air flow 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 administrator or installation function settings
(“Indoor function items” are saved in the memory of indoor unit.)
(g) Weekly timer, peak-cut timer or silent mode timer settings
(h) Remote control function setting
Please check the I/U
Set clock first on the initializing
screen & set the timer.
Other than A/C is connected
(4) Alert displays
If the following (a) to (c) appear, check and repair as follows.
Communication check screen ●This appears if communications cannot be established between the remote
control and the indoor unit.
Check whether the system is correctly connected (indoor unit, outdoor unit,
remote control) and whether the power source for the outdoor unit is connected.
●This appears when the timer settings are done without clock setting.
Set the clock setting before the timer settings.
●This appears when something other than the air-conditioner has been connected to the remote
control.
Check the location to which the remote control is connected.
(a) Communication check between indoor unit and remote control
(b) Clock setting check
(c ) Misconnection

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●
Model RC-E5
(1) Switching sequence of the operation mode switches of remote control
DRY COOL FA N HEAT AUTO
(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]
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
XY
SW2
SW1
A
B
M
S
親
子
SW1
SW2

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'19 • PAC-SM-302
1.3 Operation control function by the indoor control
(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-EX3 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.
+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

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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
perature" ⇒Operation mode: Cooling
2)
In case of "Room temperature/Heating > Indoor return air temperature" and "Outdoor temperature /Heating > Outdoor
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)
Notes (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 (DRY) operation
Indoor ambient temperatures and humidity are controlled simultaneously with the relative humidity sensor (HS) and the
suction temperature sensor [Thi-A (or the remote control sensor when it is activated)], which are installed at the suction inlet.
(a)
When the operation has been started with cooling, if there is a difference of 2 °C or less between the suction and setting
temperatures, the tap of indoor fan is lowered by one tap. This tap is retained for 3 minutes after changing the tap.
(b) After the above condition, when a difference between suction and setting temperature is lower than 3°C, and the relative
humidity is high, the tap of indoor unit fan is lowered by one tap.
When the difference between suction and setting temperature is larger than 3°C, the fan of indoor unit fan is raised by one
tap. This tap is retained for 3 minutes after changing the tap.
(c) When relative humidity becomes lower, the indoor unit fan tap is retained.
(d) In case of the thermostat OFF, the indoor unit fan tap at the thermostat ON is retained.
air tem
air tem

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(4) Timer operation
(a) RC-EX3A
(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 set-
ting of the OFF timer has priority.

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'19 • PAC-SM-302
(5) Hot start (Cold draft prevention at heating)
(a) Operating conditions
Wheneitheroneoffollowingconditionsissatised,thehotstartcontrolisperformed.
(i) From stop to heating operation
(ii) From cooling to heating operation
(iii) Form heating thermostat OFF to ON
(iv) After completing the defrost operation (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 defrost operation.
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 defrost operation, the fan motor is turned ON re-
gardless of the temperatures detected with the indoor heat exchanger thermistors (Thi-R1, R2).
(c) Ending condition
(i)Ifoneoffollowingconditionsissatised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.
(6) Hot keep
Hot keep control is performed at the start of the defrost operation.
(a) Control
(i) When the indoor heat exchanger temperature (detected with Thi-R1 or R2) drops to less than 35°C, the speed of
indoor fan follows fan setting at the time of thermostat OFF.
(ii) During the hot keep, the louver is kept at the horizontal position.

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'19 • PAC-SM-302
(7) Auto swing control
Note Even if [Auto Swing] is selected, the louver position with anti draft function is fixed to position 1.
(a) RC-EX3A
(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 seconds. 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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'19 • PAC-SM-302
(8) 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 cool-
ing 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 heating oper-
ation (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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 moves to the hot control and turns OFF
the indoor fan if the heat exchanger thermistors (both Thi-R1 and R2) detect 25°C or lower.
2)IndoorfanOFFisxedfor5minutes.Afterthe5minutes,theindoorfanisoperatedatULofor2minutes.Inthe
meantime the louver is controlled at level.
3) After operating at 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 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 drop
Temperature rise
Thermostat ON
Set room temperature
-1 +1
-1 +1
Heater ON
3
C
◦

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15
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'19 • PAC-SM-302
(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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 stope.
2)IndoorfanOFFisxedfor5minutes.Afterthe5minutes,theindoorfanisoperatedatULofor2minutes.Inthe
meantime the louver is controlled at level.
3) After operating at 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 ULo to stop.
By using operation data display function at wireless remote control, the tempenature 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.
(9) 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)
Notes(1)Timesettingfortheltersigncanbemadeasshownbelowusingtheindoorfunctionofwiredremotecontrol“Filtersign”.(Itissetatsetting1at
the shipping from factory.)
Filter sign setting
Setting 1
Setting 2
Setting 3
Setting 4
Function
Setting time: 180 hrs (Factory default)
Setting time: 600 hrs
Setting time: 1,000 hrs
Setting time: 1,000 hrs (Unit stop)
(2)
(2) After the setting time has elapsed, the “FILTER CLEANING” is displayed and, after operating for 24 hours further (counted also during the stop),
the unit stops.
(10) 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
stoppe d 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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'19 • PAC-SM-302
(11) 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-EX3A 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 & fan
ި
: Drain pump is run during cooling, dry and fan.
(12) Drain pump motor (DM) control
(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) Notes (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.
(13) Operation check/drain pump test run operation mode
(a)
If the power is turned on by the DIP switch (SW7-1) on the indoor unit control 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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'19 • PAC-SM-302
(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) 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 below Hi tap when the
compressor is turned ON, the indoor fan speed is increased by 1 tap.
(16) Anomalous fan motor
(a) After starting the fan motor, if the fan motor speed is 200 min-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 min-1 less than the required speed, it stops with the anomalous stop (E20).
(b) Selection of indoor fan speed
If it enters the frost prevention control during cooling operation (excluding dehumidifying), the indoor fan speed is
switched.
(i) When the indoor return air detection temperature (detected with Thi-A) is 18°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 fan speed is increased by 20min
- 1.
(ii) If the phenomenon of (i) above is detected again after the acceleration of indoor fan, indoor fan speed is increased
further by 20min
- 1.
Note (1) Indoor fan speed can be increased by up to 2 taps.
• Compressor frequency drop start temperature
Hs >50% Hs ≦ 50%
Item
Symbol Low High Item
Symbol Low High
A 1.0 2.5 A -0.5
1 .0
B 2.5 4.0 B
1 .0 2.5
Note (1) Frost prevention temperature setting can be selected with the indoor unit function setting of the wired remote control.
(14) Cooling, dehumidifying frost protection
(a) To prevent frosting during cooling mode or dehumidifying mode operation, the thermostat-OFF if the indoor heat
exchanger temperature (detected with Thi-R) drops to 1.0 °C or lower at 4 minutes after the thermostat-ON. If the
indoor unit heat exchanger temperature is 1.0 °C or lower after 5 minutes, the indoor unit is controlled thermostat-OFF.
If it becomes 10°C or higher, the control terminates. When the indoor heat exchanger temperature has become as show,
the indoor unit send outdoor unit the “Anti-frost” signal.
• Frost prevention temperature setting can be selected with the
indoor unit function setting of the wired remote control.
Symbol
Item A
Temperature - Low (Factory default) 1.0
Temperature - High 2.5
10A
Indoor heat exchanger temperature (°C)
Thermostat-OFF
5 minutes
Thermostat-ON capable
SRC40~60
FDC100~140
Model Symbol A
4
4
1
1
1.0
1.0
2.5
2.5
BC D

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'19 • PAC-SM-302
(17) Plural unit control – Control of 16 units group by one remote control
(a) Function
One remote control can control a group of multiple number of unit (Max. 16 indoor units). “Operation mode” which
is set by the remote control 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 control PCB. Unit No. setting by SW2 is necessary for the indoor unit only.
SW2: For setting of 0 – 9, A – F
(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) Central or each remote control basis, heating preparation: the smallest 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,ltersign:Anyofunitthatstartsinitiallyisdisplayed.
(c) Confirmation of connected units
(i) In case of RC-EX3A remote control
Ifyou touchthebuttons inthe orderof“Menu” →“Servicesetting” →“Service &Maintenance”→ “Service
password”→“IUaddress” on the TOP screen of remote control, the indoor units which are connected are displayed.
(ii) 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 smallest No.
(d) In case of anomaly
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.
(e) 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, connect the remote control wiring to each indoor unit via terminal block for the remote control.
Connect the remote control wiring separately from the power source cable or wires of other electric devices (AC220V
or higher).
(18) High ceiling control
Whensufcientairowratecannotbeobtainedfromtheindoorunitwhichisinstalledataroomwithhighceiling,theair
ow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.
-------
P-Hi1 - Hi P-Hi1 - Me
STANDARD
HIGH SPEED1
FAN SPEED SET
Hi - ULo Hi - Me
Hi - ULo Hi - Me
P-Hi2 - P-Hi1 - Hi - Me
HIGH SPEED2
P-Hi2 - Hi - Me - ULo
P-Hi2 - Hi - Me - ULo
Indoor unit air
flow setting
Fan tap
P-Hi1 - Hi - Me
Hi - Me - ULo
Hi - Me - ULo
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).
Remote control
Indoor unit
Outdoor unit
Signal wiring
between outdoor unit
and indoor units
Remote control wiring
R
0123F
4
Refrigerant piping

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'19 • PAC-SM-302
(19) Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection
(a) Broken wire detection
When the return air temperature sensor detects -55°C or lower or the heat exchanger temperature sensor detect -55°C
or lower for 5 seconds continuously, the compressor stops. After a 3-minute delay, the compressor restarts but, if it
is detected again within 60 minutes after the initial detection for 6 minutes continuously, stops again (the return air
temperature sensor : E7, the heat exchanger temperature sensor : E6).
(b) Short-circuit detection
If the heat exchanger temperature sensor detects short-circuit for 5 seconds continuously at 2 minutes and 20 seconds
after the compressor ON during cooling operation, the compressor stops (E6).
■Priority order for combinations of CnT and CnTA input.
Note (1) Following operation commands are accepted when the operation prohibition is set with CnTA as indicated with *.
Individual operation command from remote control, test run command from outdoor unit and operation command from option device, CnT input.
Reference: Explanation on the codes and the combinations of codes in the table above
1.In case of CnT “Number”, the CnT “Number” is adopted and CnTA is invalidated.
2.In case of CnTA “Number”, the CnTA “Number” is adopted and CnT is invalidated.
3.
In case of CnT “Number”/CnTA “Number”, the CnT “Number” and the CnTA “Number” become independent functions each other.
4. In case of CnT “Number” + CnTA “Number”, the CnT “Number” and the CnTA “Number” become competing functions each other.
5.In case of CnT “Number” > CnTA “Number”, the function of CnT “Number” supersedes that of CnTA “Number”.
6.In case of CnT “Number” < CnTA “Number”, the function of CnTA “Number” supersedes that of CnT “Number”.
(The “Number” above means ①- ⑥in the table.)
CnTA
①Operation stop
level
②Operation stop
pulse
③
Operation
permission/prohibition
④
Operation
permission/prohibition pulse
⑤
Cooling/heating
selection level
⑥Cooling/heating
selection pulse
CnT
①Operation stop level CnT ①CnT ①CnT ①+
CnTA ②CnT ①CnT ①/ CnTA ⑤CnT ①/ CnTA ⑥
②Operation stop pulse CnT ②CnT ②CnT ②+
CnTA ③CnT ②CnT ②/ CnTA ⑤CnT ②/ CnTA ⑥
③
Operation permission/prohibition level CnT ③> CnTA ①CnT ③> CnTA ②CnT ③+ CnTA ③CnT ③CnT ③/ CnTA ⑤CnT ③/ CnTA ⑥
④
Operation permission/prohibition pulse
CnT ④CnT ④ CnT ④+ CnTA ③※ CnT ④CnT ④/ CnTA ⑤CnT ④/ CnTA ⑥
⑤
Cooling/heating selection level
CnT ⑤/ CnTA ①CnT ⑤/ CnTA ②CnT ⑤/ CnTA ③CnT ⑤/ CnTA ④CnT ⑤CnT ⑤
⑥
Cooling/heating selection pulse CnT ⑥/ CnTA ①CnT ⑥/ CnTA ②CnT ⑥/ CnTA ③CnT ⑥/ CnTA ④CnT ⑥CnT ⑥
(20) External input/output control (CnT or CnTA)
External input/output connectors are provided on the indoor unit control PCB, and each input/output is possible to be
changed by RC-EX3A.
Be sure to connect the wired remote control to the indoor unit. Remote operation with CnT/CnTA only is not possible.
・
CnT
・
CnTA

CnTA
Blue
12V
XR6
1
2
Input/Output Connector Factory default setting RC-EX3A function name
Output
CnT-2 (XR1) Operation output External output 1
CnT-3 (XR2) Heating output External output 2
CnT-4 (XR3) Compressor ON output External output 3
CnT-5 (XR4) Inspection(Error) output External output 4
"Input
(Volt-free contact)"
CnT-6 (XR5) Remote operation input External input 1
CnTA (XR6) Remote operation input External input 2
(a) Output for external control (remote display)
Indoor unit outputs the following signal for operation status monitoring.
Output name Condition
1 Operation output During operation
2 Heating output During heating operation
3 Compressor ON output During compressor operation
4 Inspection(Error) output When anomalous condition occurs.
5 Cooling output During cooling operation
6 Fan operation output 1 When indoor unit's fan is operating
7 Fan operation output 2 When indoor unit's fan is operating, and fan speed is higher than Hi speed.
8 Fan operation output 3 When indoor unit's fan is operating, and fan speed is Lower than Me speed.
9 Defrost/oil return output When indoor unit receive defrost/oil return signal from the outdoor unit.
10 Ventilation output When "Venti.ON" is selected from remote control
11 Free cooling output When the ambient temp. is between 10 - 18°C in cooling and fan operation
12 Indoor unit overload alrm output Refer to "IU overload alarm"
13 Heater output Refer to "(8) Thermostat operation (b) Heating"
XR1
1
2
3
4
5
6
XR3
XR4
CnT
Blue
12V
XR2
XR5