Mitsubishi Heavy Industries FDTC25VH1 User manual

SM-
SERVICE MANUAL
SRR25ZS-W
SRR35ZS-W
FDTC25VH1
FDTC35VH1
(Split system, air to air heat pump type)
INVERTER RESIDENTIAL
AIR-CONDITIONERS
Ceiling concealed type
4-way ceiling cassette type
285

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1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ............... 3
1.1 Models SRR25ZS-W,35ZS-W .................................................................. 3
................................... 4
(1) Operation control function by wireless remote control
(4) Installing two air-conditioners in the same room
............................................................................. 4(3) Auto restart function
(2) Unit ON/OFF button .............................................................................. 4
.......................... 3
.............................................................................. 5(7) Economy operation
........................................................................... 5(6) High power operation
(5) Selection of the annual cooling function .............................................. 5
(8) Timer operation .................................................................................... 6
CONTENTS
(12) Outline of cooling operation ................................................................. 8
(11) Outline of heating operation ................................................................. 6
(13) Outline of dehumidifying (DRY) operation .............................................. 8
(14) Outline of automatic operation ............................................................ 9
(15) Protective control function ................................................................... 9
........................ 47
.................................................................................. 46
1.2 Models FDTC25VH1, 35VH1 .................................................................. 15
1.2.1 Remote control (option parts)............................................................... 15
1.2.3 Operation control function by the indoor control................................... 21
1.2.2 Operation control function by the wired remote control........................ 18
1.2.4 Operation control function by the outdoor control................................. 40
(4) Troubleshooting procedure (If the air-conditioner runs)
2.1 SRR series ................................................................................................ 46
(3) Troubleshooting procedure
(If the air-conditioner does not run at all) ........ 46
(1) Cautions ................................................................................................ 46
(2) Items to check before troubleshooting ................................................. 46
(10) How to make sure of wireless remote control ....................................... 64
.............................................................. 65
(12) Outdoor unit inspection points
(5) Self-diagnosis table .............................................................................. 48
(6) Service mode (Trouble mode access function) .................................... 49
(8)
Phenomenon observed after short-circuit, wire breakage on sensor .......... 62
(7) Inspection procedures corresponding to detail of trouble ..................... 57
(9) Checking the indoor electrical equipment ............................................. 62
2. MAINTENANCE DATA
(9) Silent mode .......................................................................................... 6
(10) Night setback ....................................................................................... 6
.
... 64
(11)
Inspection procedure for blown fuse on the indoor and outdoor unit PCB

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(3) Troubleshooting at the indoor unit ........................................................ 70
(2) Troubleshooting procedure ................................................................... 70
(5) Check of anomalous operation data with the remote control ................ 74
(6) Inverter checker for diagnosis of inverter output .................................. 76
(7) Outdoor unit inspection points ............................................................... 77
.................................................................................... 80(2) Troubleshooting
...................................................................................... 79(1) List of troubles
2.2.2 Troubleshooting flow
(4) Troubleshooting at the outdoor unit ...................................................... 73
.......................................................................... 79
3. ELECTRICAL WIRING .................................................................................122
4. PIPING SYSTEM ..........................................................................................125
.............................................................................................. 67
2.2 FDTC series
2.2.1 Diagnosing of microcomputer circuit ............................................... 67
(1) Selfdiagnosis function ........................................................................... 67

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1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.1 Models SRR25ZS-W, 35ZS-W
(1) Operation control function by wireless remote control
ONOCEREMITNUR
ON
/ OFF
HI POWER
Unit display section
ECONO light (orange)
Illuminates during ECONOMY operation.
HI POWER light (green)
Illuminates during HIGH POWER operation.
TIMER light (yellow)
Illuminates during TIMER operation.
This button can be used for turning on/off the unit when
remote control is not available.
Wireless remote control signal receiver
Unit ON/OFF button
RUN (HOT KEEP) light (green)
•Illuminates during operation.
•
Blinks when airflow stops due to the ‘HOT
KEEP’
and ‘ CLEAN operation ’.
ON
OFF
1.5 sec.
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
ON
OFF
0.5 sec.
0.5 sec.
Operation mode
invalid
OPERATION MODE select button
ON/OFF (luminous) button
TEMPERATURE button
AIR FLOW (UP/DOWN) button
TIME SET UP switch
SLEEP button
CLEAN switch
ON TIMER button
TIMER button
ACL switch
PROGRAM button
Operation section
HI/ECO button
SILENT button
OFF TIMER button
WEEKLY button
FAN SPEED button
NIGHT SETBACK button
SET/Child Lock button
CANCEL button
Transmission section
Each time the button is pressed, the mode
changes.
•The above illustration shows all controls, but in
practice only the relevant parts are shown.
Press to start operation, press again to
stop.
This button sets the room temperature.
This button changes the air flow (up/down)
direction.
This switch is for setting the time.
This button selects SLEEP operation.
This switch selects the CLEAN
operation.
This button selects ON TIMER operation.
This buttions is used for setting the cur-
rent time and timer function.
Switch for resetting microcomputer.
This button sets WEEKLY TIMER.
This button changes the HIGH POWER/
ECONOMY operation.
This buttion changes the SILENT
operation.
This button selects OFF TIMER
operation.
This button switches the WEEKLY
TIMER to ON/OFF.
Each time the button is pressed, the fan
speed changes.
This button sets NIGHT SETBACK
operation.
Use this button to set the timer and
Child Lock.
This button cancels the ON timer, OFF
timer, and SLEEP operation.
Unit display sectionUnit display section
RUN (HOT KEEP) light (green)
・Illuminates during operation.
・
Blinks when airflow stops due to the ‘ HOT
KEEP
’ and ‘ CLEAN operation ’ .
ECONO light (orange)
Illuminates during ECONOMY operation.
TIMER light (yellow)
Illuminates during TIMER operation.
HI POWER light (green)
Illuminates during HIGH POWER operation.
Unit ON/OFF button
This button can be used for turning on/off the
unit when wireless remote control is not available.
Wireless remote control signal receiver
ON
OFF
1.5 sec.
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
Operation mode
invalid
ON
OFF
0.5 sec.
0.5 sec.

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(2) Unit ON/OFF button
When the wireless remote control batteries become weak, or if the wireless remote control is lost or malfunctioning, this but-
ton may be used to turn the unit on and off.
(a) Operation
Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off.
(b) Details of operation
The unit will go into the automatic mode in which it automatically determines, from indoor temperature (as detected by sen-
sor), whether to go into COOL, DRY or HEAT modes.
(3) Auto restart function
(a)
Auto restart function records the operational status of the air-conditioner immediately prior to be switched off by a power
cut, and then automatically resumes operations after the power has been restored.
(b) The following settings will be cancelled:
(i) Timer settings
(ii) HIGH POWER operation
Notes (1) Auto restart function is set at on when the air-conditioner is shipped from the factory. Con-
sult with your dealer if this function needs to be switched off.
(2) When power failure ocurrs, the timer setting is cancelled. Once power is resumed, reset the
timer.
(3)
If the jumper wire (J170) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram
at right.)
Jumper wire (J170)
RUN (HOT KEEP) light (green)
・Illuminates during operation.
・
Blinks when airflow stops due to the ‘ HOT
KEEP ’ and ‘ CLEAN operation ’ .
ECONO light (orange)
Illuminates during ECONOMY operation.
TIMER light (yellow)
Illuminates during TIMER operation.
HI POWER light (green)
Illuminates during HIGH POWER operation.
Unit ON/OFF button
This button can be used for turning on/off the
unit when remote control is not available.
Remote control signal receiver
ON
OFF
1.5 sec.
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
Unit ON/OFF button
Function
Operation mode
Indoor temperature
setting
Fan speed Flap/Louver Timer switch
COOL About 24ºC
Auto Auto Continuous
DRY About 25ºC
HEAT About 26ºC
When two air-conditioners are installed in the room, use setting when the two air-conditioners are not operated with one wireless
remote control. Set the wireless remote control and indoor unit.
ࠉ
(a) Setting the wireless remote control
(i) Pull out the cover and take out batteries.
(ii) Disconnect the switching line next to the battery with wire cutters.
(iii) Insert batteries. Close the cover
.
ࠉ
(b) Setting an indoor unit
(i)
Turn off the power source, and turn it on after 1 minute.
(ii) Point the wireless remote control that was set according to the procedure described
on the left side at the indoor unit display section and send a signal by pressing the
ACL switch on the wireless remote control.
Since the signal is sent in about 6 seconds after the
ACL switch is pressed,
point the wireless remote control at the indoor unit display section for some time.
(iii) Check that the reception buzzer sound "Peep" is emitted from the indoor unit.
At completion of the setting, the indoor unit emits a buzzer sound "Peep".
(If no reception tone is emitted, start the setting from the beginning again.)
Disconnect
(4) Installing two air-conditioners in the same room
Reception
Peep

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(a) The annual cooling control is valid from factory default setting. It is possible
to disable by cutting jumper wire (J172), or changing the setting of DIP switch
(SW2-4) on the interface kit (option) PCB if it is connected.
Note: (1) Default states of the jumper wire (J172) and the interface kit at the shipping from factory – On the
PCB, the DIP switch (SW2-4) is set to enable the annual cooling function.
(2) To cancel the annual cooling setting, consult your dealer.
(b) Content of control
(i) If the outdoor air temperature sensor (TH3) detects below 5°C, the indoor
unit speed is switched to 8th step.
(ii) If the outdoor air temperature sensor (TH3) detects higher than 17°C, the indoor unit speed is changed to the normal
control speed.
Jumper wire
(J172)
Interface kit
(SC-BIKN2-E)
SW2-4
Function
Shorted ON Enabled
Shorted OFF Disabled
Open ON Disabled
Open OFF Disabled Jumper wire (J172)
ON
5 17
OFF
Outdoor air temperature ( C)
Pressing the HI POWER/ECONO button intensifies the operating power and initiates powerful cooling and heating operation
for 15 minutes continuously. The wireless remote control displays and the FAN SPEED display disappears.
(a) During the HIGH POWER operation, the room temperature is not controlled. When it causes an excessive cooling and heating,
press the HI POWER/ECONO button again to cancel the HIGH POWER operation.
(b) HIGH POWER operation is not available during the DRY and the program timer operations.
(c) When HIGH POWER operation is set after ON TIMER operation, HIGH POWER operation will start from the set time.
(d) When the following operation are set, HIGH POWER operation will be canceled.
①When the HI POWER/ECONO button is pressed again.
④When the SILENT botton is pressed.
②When the operation mode is changed. ⑤When the NIGHT SETBACK botton is pressed.
③When it has been 15 minutes since HIGH POWER operation has started.
(e) Not operable while the air-conditioner is OFF.
(f) After HIGH POWER operation, the sound of refrigerant flowing may be heard.
(6) High power operation
Pressing the HI POWER/ECONO button initiate a soft operation with the power suppressed in order to avoid an excessive cooling
or heating. The unit operate 1.5℃higher than the setting temperature during cooling or 2.5℃lower than that during heating. The
wireless remote control displays ECONO mark and the FAN SPEED display disappears.
(a) It will go into ECONOMY operation at the next time the air-conditioner runs in the following cases.
①When the air-conditioner is stopped by ON/OFF button during ECONOMY operation.
②When the air-conditioner is stopped in SLEEP or OFF TIMER operation during ECONOMY operation.
③When the operation is retrieved from CLEAN operation.
(b) When the following operation are set, ECONOMY operation will be canceled.
①When the HI POWER/ECONO button is pressed again.
②When the operation mode is changed DRY to FAN.
③When the NIGHT SETBACK botton is pressed.
(c) Not operable while the air-conditioner is OFF.
(d) The setting temperature is adjusted according to the following table.
①at the start of operation
②one hour after the start of operation
③two hours after the start of operation
Temperature
adjustment
Cooling Heating
①＋0.5 ①−1.0
②＋1.0 ②−2.0
③＋1.5 ③−2.5
Mode
Item
(7) Economy operation
(5) Selection of the annual cooling function

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(b) Sleep timer operation
Pressing the SLEEP button causes the temperature to be controlled with respect to the set temperature.
(8) Timer operation
(a) Comfortable timer setting (ON timer)
(c) OFF timer operation
The Off timer can be set at a specic time (in 10-minute units) within a 24-hour period.
If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto
mode operation is selected, the comfortable timer starts and determines the starting time of next operation based on the initial
value of 15 minutes and the relationship between the indoor temperature at the setting time (temperature of room tempera-
ture sensor) and the setting temperature.
(9) Silent mode
As “Silent mode start” signal is received from the wireless remote control, it operates by dropping the outdoor fan tap and the
compressor command speed.
(10) Night setback
As “Night setback” signal is received from the wireless remote control, the heating operation starts with the setting temperature
at 10℃.
Outdoor fan tap
(Upper limit)
Compressor command
speed (Upper limit)
Cooling Heating Cooling Heating
SRR25ZS-W SRR35ZS-W
4th speed
37 rps
4th speed
46 rps
5th speed
46 rps
4th speed
56 rps
(11) Outline of heating operation
(d) Weekly timer operation
Timer operation (ON timer, OFF timer) can be set up to 4 times a day for each weekday.
ON OFF
ON ON
ON OFF
(few minutes ON)
ON ON(HOT KEEP)
OFF
OFF
(3 minutes ON)
OFF
OFF
Thermostat ON Thermostat OFF Failure
Heating
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
(b) Details of control at each operation mode (pattern)
(i) Fuzzy operation
Deviation between the indoor temperature setting correction temperature and the return air temperature is calcu-
lated in accordance with the fuzzy rule, and used for control of the air capacity and the compressor speed.
When the defrosting, protection device, etc. is actuated, operation is performed in the corresponding mode.
(ii) Hot keep operation
If the hot keep operation is selected during the heating operation, the indoor blower is controlled based on the
temperature of the indoor heat exchanger (Th2) to prevent blowing of cool wind.
However, if the fan speed setting is HI and room temperature is 19ºC or higher, this control is not executed.
30-115rps
30-115rps
30-62rps
30-46rps
SRR35ZS-W
30-102rps
30-102rps
30-58rps
30-76rps30-72rps
30-42rps
SRR25ZS-W
Model
Fan speed
Auto
MED
HI
ULO
LO
(a) Operation of major functional components in heating mode

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5) During continuous compressor operation
In addition, when the speed command from the indoor control of the indoor unit during heating operation has counted
0 rps 10 times or more and all conditions of 1), 2) and 3) above and the outdoor air temperature is 3°C or less are satis-
ed (note that when the temperature for outdoor heat exchanger temperature sensor (TH2) is -5°C or less: 62 rps or
more, -4°C or less: less than 62 rps), defrost operation is started.
(ii) Ending conditions (Operation returns to the heating cycle when either one of the following is satised.)
1) Outdoor heat exchanger temperature sensor (TH2) : 13ºC or higher
2) Continued time of defrost operation → For more than 15 minutes
Max. 15 minutes
Heating operatio
n
¡Defrost operation
Depends on an operation condition, the time can be longer than 7 minutes.
2-7 minutes 
Hot keep operation
(c) Defrost operation
(i) Starting conditions (Defrost operation can be started only when all of the following conditions are satised.)
1) After start of heating operation
When it elapsed 35 minutes (Accumulated compressor operation time)
2) After end of defrost operation
When it elapsed 35 minutes (Accumulated compressor operation time)
3) Outdoor heat exchanger temperature sensor (TH2)
When the temperature has been below –5ºC for 3 minutes continuously
4) The difference between the outdoor air sensor temperature and the outdoor heat exchanger temperature sensor
¡The outdoor air temperature ≧0°C : 7°C or higher
¡-15°C ≦The outdoor air temperature ＜0°C : 3/15 × The outdoor air temperature + 7°C or higher (SRR25)
4/15 × The outdoor air temperature + 7°C or higher (SRR35)
¡The outdoor air temperature < -15°C : -5°C or higher
-20
-20 -15 -10 -5 0 5 10
-15
-10
-5
0
Outdoor air temperature (℃)
Outdoor heat exchanger temperature (
℃)
-20
-20 -15 -10 -5 0 5 10
-15
-10
-5
0
Outdoor air temperature (℃)
Outdoor heat exchanger temperature (℃)
Defrost operation
start
Defrost operation
start
Defrost operation start temperature
Defrost operation start temperature
Models 20～35 Model 50
-20
-20 -15 -10 -5 0 5 10
-15
-10
-5
0
Outdoor air temperature (℃)
Outdoor heat exchanger temperature (℃)
-20
-20 -15 -10 -5 0 5 10
-15
-10
-5
0
Outdoor air temperature (℃)
Outdoor heat exchanger temperature (℃)
Defrost operation
start
Defrost operation
start
Defrost operation start temperature
Defrost operation start temperature
Models 20～35 Model 50
SRR25 SRR35

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(12) Outline of cooling operation
(b) Detail of control in each mode (Pattern)
(i) Fuzzy operation
During the fuzzy operation, the air ow and the compressor speed are controlled by calculating the difference be-
tween the indoor temperature setting correction temperature and the retum air temperature.
ON OFF OFF
OFF OFF OFF
ON OFF
(few minutes ON)
OFF
(few minutes ON)
ON ON OFF
Thermostat ON Thermostat OFF Failure
Cooling
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
20-96rps
20-96rps
20-74rps
20-58rps
SRR35ZS-W
20-74rps
20-74rps
20-55rps
20-45rps
SRR25ZS-W
Model
Fan speed
Auto
MED
HI
LO
20-44rps20-34rps
ULO
(13) Outline of dehumidifying (DRY) operationion
(a) Purpose of DRY mode
The purpose is "Dehumidication", and not to control the humidity to the target condition.
Indoor/outdoor unit control the operation condition to reduce the humidity, and also prevent over cooling.
(b) Outline of control
(i) Indoor unit fan speed and compressor are controlled by the area which is selected by the temperature difference.
(ii) The indoor unit check the current area by every 5 minutes, and operate by the next checking.
(c) Other
When the outside temperature and room temperature is low for cooling operation, indoor unit can not operate in cooling,
and dehumidify. In this case, the units operate in heating to rise the room temperature, and after that start DRY operation.
Indoor unit fan speed
Area
DCBA
Me speed
Indoor unit
fan speedULo(Lo) speed
STOP
Limited䠄Lower than
normal cooling operation䠅
Compressor
Limited
speed
Minimum 䠄Lower than the speed in ”Area A”䠅
STOP
Setting temperature
Difference between setting temperature and return temperature
(a) Operation of major functional components in cooling mode

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(b) The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the previous
operation mode, changes the operation mode.
(c) When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is se-
lected during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.
(d) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the sig-
nals of the wireless remote control and the setting temperature.
(e) When the unit is operated automatically with the wired remote control connected, the cooling operation is controlled ac-
cording to the display temperatures while the setting temperature is compensated by +1°C during dehumidifying or by +2°C
during heating.
(14) Outline of automatic operation
(a) Determination of operation mode
The unit checks the indoor air temperature and the outdoor air temperature, determines the operation mode, and then be-
gins in the automatic operation.
27.5
25.5
19.5
18
A
30
Heating
Dehumidifying
Cooling
Indoor air temperature (˚C)
Outdoor air temperature (˚C)
(i)
(ii)
(iii)
When both the indoor and the outdoor air temperatures are in the range “A”, cooling or heating is switched depending on
the difference between the setting temperature and the indoor air temperature.
When the operation mode has been judged following the change of setting temperature with the remote control, the hourly
judgment of operation mode is cancelled.
If the setting temperature is changed with the wireless remote control, the operation mode is judged immediately.
Signals of wireless remote control (Display)
–6 –5 –4 –3 –2 –1 ±0 +1 +2 +3 +4 +5 +6
Setting
temperature
Cooling 18 19 20 21 22 23 24 25 26 27 28 29 30
Dehumidifying 19 20 21 22 23 24 25 26 27 28 29 30 31
Heating 20 21 22 23 24 25 26 27 28 29 30 31 32
Unit : ºC
(a) Frost prevention control (During cooling or dehumidifying)
(15) Protective control function
(17) Frost prevention control
( i ) Operating conditions
( ii ) Detail of anti-frost operation
(iii) Reset condition
Indoor heat exchanger
temperature (ºC)
2.
58
Operation mode
Item Protective control Reset
Compressor operation
Indoor fan
Forced outage Operation instruction
Depends on operation mode
8
2.51)
2)
Reset
Protective
control

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Outdoor air temperature (°C)
37 38 40 41
OFF
ON1
ON2
Outdoor air temperature (°C)
40 41 46 47
OFF
ON1
ON2
46 47
ON3
'09•SRK-DB-087D
(b) Frost prevention control
(i) Operating conditions
(ii) Detail of anti-frost operation
(iii) Reset conditions
Indoor heat exchanger
temperature (°C)
2.55 8
0 rps
Lower
limit
speed
(b) Cooling overload protective control
(
i )Operating conditions
(b) Detail of operation
Indoor heat exchanger
temperature
Item 5°C or lower 2.5°C or lower
Lower limit of compressor command speed
Indoor fan
Outdoor fan
4-way valve
Outdoor air temperature
Lower limit speed
1)
2)
1)
2)
(i)
(ii)
(i)
(ii)
(c) Reset conditions
(models SRK50, 60 : 25 rps)
Depends on compressor speed
The lower limit of compressor speed is set to 30 or 40 rps.
However, when the thermo OFF, the speed is reduced to 0 rps.
The outdoor fan is stepped up by 3 speed step. [Upper limit 8 th speed.]
compressor
speed
Keep the fan speed before
frost prevention control
2.5–5
5–8
When the outdoor air temperature (TH3) has become continuously for 30 seconds at 41°C or more, or
47ºC or more with the compressor running, the lower limit speed of compressor is brought up.
40°C.
45
(ii ) Detail of operation
1) The outdoor fan is stepped up by 3 speed step. (Upper limit 8th speed.)
2) The lower limit of compressor command speed is set to 30 or 45 rps and even if the calculated result becomes
lower than that after fuzzy calculation, the speed is kept to 30 or 45 rps. However, when the thermo OFF, the
speed is reduced to 0 rps.
(iii) Reset conditions
When either of the following condition is satised
1) The outdoor air temperature is lower than 40ºC.
2) The compressor command speed is 0 rps.
'09•SRK-DB-087D
(b) Frost prevention control
(i) Operating conditions
(ii) Detail of anti-frost operation
(iii) Reset conditions
Indoor heat exchanger
temperature (°C)
2.55 8
0 rps
Lower
limit
speed
(2) Cooling overload protective control
(a) Operating conditions
(b) Detail of operation
Indoor heat exchanger
temperature
Item 5°C or lower 2.5°C or lower
Lower limit of compressor command speed
Indoor fan
Outdoor fan
4-way valve
Outdoor air temperature
Lower limit speed
1)
2)
1)
2)
(i)
(ii)
(i)
(ii)
(c) Reset conditions
(models SRK50, 60 : 25 rps)
Depends on compressor speed
The lower limit of compressor speed is set to 30 or 40 rps.
However, when the thermo OFF, the speed is reduced to 0 rps.
The outdoor fan is stepped up by 3 speed step. [Upper limit 8 th speed.]
compressor
speed
Keep the fan speed before
frost prevention control
2.5–5
5–8
When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41°C or more, or
47ºC or more with the compressor running, the lower limit speed of compressor is brought up.
40°C.
(c)
(i)
(ii)
(iii)
6
6
㻞㻡
㻠㻤 㻡㻟 㻡㻡
㻡㻟 㻡㻤 㻢㻟
㻠㻣 㻡㻜 㻡㻟
630
temperature
(d) Cooling low outdoor temperature protective control
( i ) Operating conditions
When the outdoor air temperature (TH3) is 22ºC or lower continues for 20 seconds while the compressor com-
mand speed is other than 0 rps.
( ii ) Detail of operation
1) The lower limit of the compressor command speed is set to 50〈44〉 (30) rps and even if the speed becomes
lower than 50〈44〉 (30) rps, the speed is kept to 50〈44〉 (30) rps. However, when the thermo OFF, the speed
is reduced to 0 rps.
2) The upper limit of the compressor command speed is set to 50〈50〉 (60) rps and even if the calculated result
becomes higher than that after fuzzy calculation, the speed is kept to 50〈50〉 (60) rps.
Notes (1) Values in
〈〉
are for outdoor air temperature is A or BºC
(2) Values in ( ) are for outdoor air temperature is C or DºC
'09•SRK-DB-087D
(f) Heating overload protective control
(i) Indoor unit side
1)
2)
3)
(ii) Outdoor unit side
b) Detail of operation
Model 50
ABCD
RPSmin < 40
40 <
=RPSmin < 80
80 <
=RPSmin < 90
90 <
=RPSmin < 102
102 <
=RPSmin
49
53
41
53 ~ 47
47 ~ 41
53
57
45
57 ~ 51
51 ~ 45
55
59
47
59 ~ 53
53 ~ 47
58
62
51
58
51
1) Operating conditions
When the outdoor air temperature (TH3) is 22ºC or higher continues for 30
seconds while the compressor command speed other than 0 rps.
i)
ii)
iii)
iv)
Taking the upper limit of compressor command speed range at 60 rps, if the output speed obtained with the fuzzy
calculation exceeds the upper limit, the upper limit value is maintained.
The lower limit of compressor command speed is set to 40 rps and even if the calculated result becomes lower than
that after fuzzy calculation, the speed is kept to 40 rps. However, when thethermo becomes OFF, the speed is
reduced to 0 prs.
rps.
Operating conditions
Detail of operation
Reset conditions
9
3
3

'20 • SR-SM-285
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(iii) Reset conditions
When either of the following condition is satised
1) The outdoor air temperature (TH3) is D ˚C or higher.
2) The compressor command speed is 0 rps.
'09•SRK-DB-087D
(f) Heating overload protective control
(i) Indoor unit side
1)
2)
3)
(ii) Outdoor unit side
b) Detail of operation
Model 50
ABCD
RPSmin < 40
40 <
=RPSmin < 80
80 <
=RPSmin < 90
90 <
=RPSmin < 102
102 <
=RPSmin
49
53
41
53 ~ 47
47 ~ 41
53
57
45
57 ~ 51
51 ~ 45
55
59
47
59 ~ 53
53 ~ 47
58
62
51
58
51
1) Operating conditions
When the outdoor air temperature (TH3) is 22ºC or higher continues for 30
seconds while the compressor command speed other than 0 rps.
i)
ii)
iii)
iv)
Taking the upper limit of compressor command speed range at 60 rps, if the output speed obtained with the fuzzy
calculation exceeds the upper limit, the upper limit value is maintained.
The lower limit of compressor command speed is set to 40 rps and even if the calculated result becomes lower than
that after fuzzy calculation, the speed is kept to 40 rps. However, when thethermo becomes OFF, the speed is
reduced to 0 prs.
rps.
Operating conditions
Detail of operation
Reset conditions
9
3
3
2) Detail of operation
Upper and lower limits of compressor speed and the outdoor unit fan speed are restricted.
First time
After the
second times
Outdoor air temperature (˚C)
ACE DBF
0 22-8 253-5
5 25-2 2881
●Values of A, B, C, D, E, F
Outdoor air temperature (°C)
Upper 2
Lower2
ON
ON
Upper 3
Lower 3
ON
Upper 1
Lower 1
CA
OFF
E DBF
Compressor speed: Upper/lower limit (rps)
Upper 2 Lower 3 Upper 3Lower 2
Lower 1 Upper 1
Range ARange B
2624
Indoor air temperature (℃
Range A
Range B
50 50 50446030 Release
(e) Heating high pressure control
( i ) Starting condition
When the indoor heart exchanger temperature (Thi-R) has risen to a specied temperature while the compressor is turned on.
( ii ) Compressor speed is controlled according to the zones of indoor heat exchanger temperature as shown by the following
table.
Thi-R<P1 P1≦Thi-R<P2 P2≦Thi-R<P3 P3≦Thi-R
Protection control speed (NP)
Normal Retention NP-4rps NP-8rps
Sampling time (s) Normal 20 20 20
Thi-R
NP P1 P2 P3
NP < 50
47 55 54
50
≦
NP < 92
47.5 55 57
92
≦
NP < 115
47.5-39 55-40 57-42
115≦
NP
39 40 42
Unit:°C
Compressor command speed (rps) Outdoor fan
speed
Lower limit Upper limit
Range A Range B 60 2nd speed
40 Release
)
'09•SRK-DB-087D
(g) Heating overload protective control
(i) Indoor unit side
1) Operating conditions :
2) Detail of operation :
3) Reset conditions :
(ii) Outdoor unit side
1) Operating conditions :
2) Detail of operation
3) Reset conditions:
(i) Operating conditions:
(ii) Detail of operation:
(h) Heating low outdoor temperature protective control
(iii) Reset conditions:
-10 -8 -2 2
Lower limit 45 rps
Lower limit 40 rps
Normal operation
Outdoor air temperature(°C
10 11 19 20
Normal operation
Protective control ON1
Protective control ON2
Outdoor air temperature(°C)
21 22
Normal operation
Protective
control
Outdoor air temperature(°C)
• Model SRK50
• Model SRK50
• Models SRK20 ~ 35
• Models SRK20 ~ 35
(i)
ޓ Operating conditions: When the outdoor air temperature (TH2) is lower than 4ºC or 13ºC or higher continues for 30
seconds while the compressor command speed is other than 0 rps.
(ii)ޓDetail of operation: The lower limit compressor command speed is change as shown in the figure belo.
Lower limit 29 rps
Normal operation
46
Outdoor air temperature(°C)
Model SRK50
ABCD
RPSmin < 40
40 <
=RPSmin < 80
80 <
=RPSmin < 90
90 <
=RPSmin < 102
102 <
=RPSmin
49
53
41
53 ~ 47
47 ~ 41
53
57
45
57 ~ 51
51 ~ 45
55
59
47
59 ~ 53
53 ~ 47
58
62
51
58
51
When the outdoor air temperature (TH2) is 22ºC or higher continues for 30 seconds while
the compressor command speed other than 0 rps.
a)
b)
c)
d)
Taking the upper limit of compressor command speed range at 60 rps, if the output speed obtained with the fuzzy
calculation exceeds the upper limit, the upper limit value is maintained.
The lower limit of compressor command speed is set to 40 rps and even if the calculated result becomes lower than
that after fuzzy calculation, the speed is kept to 40 rps. However, when thethermo OFF, the speed is reduced to
0 prs.
rps.
1) Operating conditions :
2) Detail of operation
When the outdoor air temperature (TH2) is 11ºC or higher continues for 30 seconds while
the compressor command speed other than 0 rps.
a)
b)
c)
d)
Taking the upper limit of compressor command speed range at 78 rps, if the output speed obtained with the fuzzy
calculation exceeds the upper limit, the upper limit value is maintained.
The lower limit of compressor command speed is set to 30 rps and even if the calculated result becomes lower than
that after fuzzy calculation, the speed is kept to 30 rps. However, when thethermo OFF, the speed is reduced
to 0 prs.
rps.
.
3) Reset conditions: .
1)
2)
30
Protective
control
ON1
ON2
Item Compressor command speed
Low limit
30 rps
30 rps
Upper limit
78 rps
51 rps
It depends on compressor command speed
Outdoor fan speed
2nd
10
2321
Indoor air temperature (
Υ
Range A
Range B

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(h) Compressor overheat protection
(i) Purpose
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor overheat.
(ii) Detail of operation
1) Speeds are controlled with temperature detected by the temperature sensor mounted on the discharge pipe.
Notes (1) When the discharge pipe temperature is in the range of 100-110ºC, the speed is reduced by 4 rps.
(2) When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps.
(3)
If the discharge pipe temperature is in the range of 90-100ºC even when the compressor command speed is maintained for 3 minutes when the temperature is
in the range of 90-100ºC, the speed is raised by 1 rps and kept at that speed for 3 minutes. This process is repeated until the command speed is reached.
(4) Lower limit speed
Discharge pipe temperature (˚C)
Lower limit (4)
After lapse of 3 min. or over (3)
After lapse of 3 min. or over (3)
After lapse of 3 min. or over (3)
4 rps
4 rps (1)
0 rps
100 110
(Example) Fuzzy
90
Cooling Heating
Lower limit speed 15 rps 20 rps
Item
Model
2) If the temperature of 110ºC is detected by the temperature sensor on the discharge pipe, then the compressor will stop im-
mediately.
When the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts again within 1 hour
but there is no start at the third time.
( i ) Current safe
(i) Purpose
Current is controlled not to exceed the upper limit of the setting operation current.
(ii) Detail of operation
Input current to the converter is monitored with the current sensor xed on the printed circuit board of the outdoor unit
and, if the operation current value reaches the limiting current value, the compressor command speed is reduced. If the
mechanism is actuated when the compressor command speed is less than 30 (36:SRR35) rps, the compressor is stopped
immediately. Operation starts again after a delay time of 3 minutes.
1)
Operating conditions
2)
Detail of operation
(g) Heating low outdoor temperature protective control
(i) Protective control I
changed as shown in the figure below.
3-2
3) Reset conditions
-10 -8 -2 2
Lower limit 45 rps
Lower limit 40 rps
Normal operation
Outdoor air temperature(°C)
a)
b)
2
3
(iii) Reset condition
When the outdoor air temperature drops below 21ºC

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( j ) Current cut
(i) Purpose
Inverter is protected from overcurrent.
(ii) Detail of operation
Output current from the inverter is monitored with a shunt resistor and, if the current exceeds the setting value, the com-
pressor is stopped immediately. Operation starts again after a delay time of 3 minutes.
(m) Serial signal transmission error protection
(i) Purpose
Prevents malfunction resulting from error on the indoor ↔outdoor signals.
(ii) Detail of operation
If the compressor is operating and a serial signal cannot be received from the indoor control with outdoor control having se-
rial signals continues for 7 minute and 35 seconds, the compressor is stopped.After the compressor has been stopped, it will
be restarted after the compressor start delay if a serial signal can be received again from the indoor control.
(
k ) Outdoor unit failure
This is a function for determining when there is trouble with the outdoor unit during air-conditioning.
The compressor is stopped if any one of the following in item (i), (ii) is satised. Once the unit is stopped by this function, it is not
restarted.
(i) When the input current is measured at 1 A or less for 3 continuous minutes or more.
(ii) If the outdoor unit sends a 0 rps signal to the indoor unit 3 times or more within 20 minutes of the power being turned on.
(
l ) Indoor fan motor protection
When the air-conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300 min-1 or
under for more than 30 seconds, the unit enters rst in the stop mode and then stops the entire system.
(
n ) Rotor lock
If the motor for the compressor does not turn after it has been started, it is determined that a compressor lock has occurred and
the compressor is stopped.
(
o ) Outdoor fan motor protection
If the outdoor fan motor has operated at 75 min-1 or under for more than 30 seconds, the compressor and fan motor are stopped.
(
p ) Outdoor fan control at low outdoor air temperature
(i) Cooling
1) Operating conditions
When the outdoor air temperature (TH3) is 22ºC or lower continues for 30 seconds while the compressor command speed
is other than 0 rps.
2) Detail of operation
After the outdoor fan operates at A speed for 60 seconds; the corresponding outdoor heat exchanger temperature shall im
plement the following controls.
a) Outdoor heat exchanger temperature =
<21ºC
After the outdoor fan speed drops (down) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is
lower than 21ºC, gradually reduce the outdoor fan speed by 1 speed. (Lower limit 1st speed)
b) 21ºC < Outdoor heat exchanger temperature =
<38ºC
After the outdoor fan speed maintains at A speed for 20 seconds; if the outdoor heat exchanger temperature is 21ºC-
38ºC, maintain outdoor fan speed.
c) Outdoor heat exchanger temperature > 38ºC
After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is higher
than 38ºC, gradually increase outdoor fan speed by 1 speed. (Upper limit 3rd speed)
Outdoor temperature > 10˚C
Outdoor temperature <
=10˚C
2nd speed
Outdoor fan
1st speed
¡Value of A

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(q) Drain pump motor (DM) control
(i) Drain pump motor (DM) is operated during the cooling or dehumidifying mode operations and simultaneously wity the
compressor ON. The DM continues to operate for 5 minutes after the operation stop, anomalous stop, thermostat stop or
when it was switched from the cooling and dehumidifying operations to the fan or heating operation.
Indoor unit operation mode
Stop (1) COOL DRY FAN (2) HEAT
Compressor ON Control A
Compressor OFF Control B
Notes (1) Inciuding the stop from the cooling, dehumiditying, fan
and heating, and the anomalous stop
(2) Inciuding the “FAN” operation according to the
mismatch of operation modes
1) Control A
a) If the oat switch detects any anomalous draining condition, the unit stops with the anomalous stop and the drain
pump starts. After detecting the anomalous condition, the drain pump motor continues to be ON.
b) It keeps operating while the oat switch is detecting the anomalous condition.
2) Control B
If the oat switch detects any anomalous drain condition, the drain pump motor is turned ON for 5 minutes, and at 10
seconds after the drain pump 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, displayed by the ashing of display lights and the drain pump motor is
turned ON. (The ON condition is maintained during the drain detection.)
(ii) Heating
1) Operating conditions
When the outdoor air temperature (TH3) is 0ºC or lower continues for 30 seconds while the compressor command
speed is other than 0 rps.
2) Detail of operation
The outdoor fan is stepped up by 2 speed step at each 20 seconds. (Upper limit 8th speed)
3) Reset conditions
When either of the following conditions is satised
a) The outdoor air temperature (TH3) is 2ºC or higher.
b) The compressor command speed is 0 rps.
(r) Refrigeration cycle system protection
(i) Starting conditions
1)
2)
When 5 minutes have elapsed after the compressor ON or the completion of the defrost control
Other than the defrost control
(ii) Contents of control
1)
(iii) Reset condition
When the compressor has been turned OFF
2)
When the conditions of (i) above are satified, the compressor stops.
Error stop occurs when the compressor has stopped 3 times within 60 minutes.
3) When, after satisfying the conditions of 1) and 2) above, the compressor speed, room temperature (Th1) and indoor
heat exchanger temperature (Th2) have satisfied the conditions in the following table for 5 minutes:
Note (1) Except that the fan speed is Hi in heating operation.
Compressor speed (N)Operation mode
Cooling
Heating(1)
Indoor temperature (Th1)
Th1−4<Th2
Indoor temperature (Th1)/
Indoor heat exchanger temperature (Th2)
Th2<Th1+6
50 N
<
=
10 Th1 40
<
=< =
0 Th1 40
<
=< =
50 N
<
=
( r ) Refrigeration cycle system protection
3) Reset conditions
When either of the following conditions is satised
a) The outdoor air temperature (TH3) is 25ºC or higher.
b) The compressor command speed is 0 rps.

'20 • SR-SM-285
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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 ③ are 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
1.2 Models FDTC25VH1, 35VH1
1.2.1 Remote control (Option parts)
(1) Wired remote control
Model RC-EX3A

'20 • SR-SM-285
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16
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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)
-
(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)
-

'20 • SR-SM-285
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113
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'16 • PAC-T-251
(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 ow 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.
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.
⑥ON TIMER button Used to set the ON TIMER.
⑦OFF TIMER button Used to set the OFF TIMER.
⑧SELECT button
Used to switch the time when setting the timer or adjusting the time.
Used to switch the settings of the indoor function.
⑨SET 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.
⑩CANCEL button Used to cancel the timer setting.
⑪SLEEP button Used to set the sleep timer.
⑫ECO button Pressing this button starts the energy-saving operation.
Pressing this button again cancels it.
⑬HI POWER button Pressing this button starts the high power operation.
Pressing this button again cancels it.
⑭SILENT button Pressing this button starts the silent mode control.
Pressing this button again cancels it.
⑮NIGHT SETBACK button Pressing this button starts the home leave mode.
Pressing this button again cancels it.
⑯FILTER button Pressing this button resets FILTER SIGN.
⑰
FUNCTION SETTING switch Used to set the indoor function.
⑱TIME SETUP switch Used to set the current time.
⑲ACL switch Used to reset the microcomputer.
(2) Wireless remote control
RCN-E2
-
113
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'16 • PAC-T-251
(2) Wireless remote control
Indication section
Operation section
Transmitter: Sends signal to the air-
conditioner.
①
⑲
⑤
②
⑫④
③
⑰
⑮
⑨
⑩
⑯
⑪
⑧
⑥
⑭
⑦
⑬
⑱

'20 • SR-SM-285
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1.2.2 Operation control function by the wired remote control
-
114
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'16 • PAC-T-251
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.

'20 • SR-SM-285
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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