Mitsubishi Heavy Industries SRK15ZTL-W User manual

Manual No.'22・SRK-SM-349
INVERTER WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS
(Split system, air to air heat pump type)
SRK15ZTL-W
20ZTL-W
25ZTL-W
35ZTL-W
50ZTL-W
SERVICE MANUAL
Wireless LAN interface is standard equipment.

CONTENTS
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER........................3
(1) Operation control function by wireless remote control..................................3
(2) Unit ON/OFF button.......................................................................................4
(3) Auto restart function ......................................................................................4
(4) Installing two air-conditioners in the same room...........................................4
(5) Selection of the annual cooling function .......................................................5
(6) Heating only function ....................................................................................5
(7) High power operation ....................................................................................5
(8) Economy operation........................................................................................6
(9) Air flow direction adjustment .........................................................................6
(10) 3D auto operation ..........................................................................................7
(11) Timer operation..............................................................................................8
(12) Silent operation..............................................................................................9
(13) Night setback operation ................................................................................9
(14) Air flow range setting .....................................................................................9
(15) Display brightness adjustment ....................................................................10
(16) Wireless LAN connection function...............................................................10
(17) Fan control during heating thermostat OFF.................................................10
(18) Outline of heating operation ........................................................................11
(19) Outline of cooling operation ........................................................................12
(20) Outline of dehumidifying (DRY) operation....................................................13
(21) Outline of automatic operation ....................................................................13
(22) Protective control function...........................................................................14
2. MAINTENANCE DATA .......................................................................................21
(1) Cautions.......................................................................................................21
(2) Items to check before troubleshooting........................................................21
(3) Troubleshooting procedure (If the air-conditioner does not run at all).........21
(4) Troubleshooting procedure (If the air-conditioner runs) ..............................22
(5) Self-diagnosis table .....................................................................................23
(6) Service mode (Trouble mode access function)............................................24
(7) Inspection procedures corresponding to detail of trouble...........................32
(8) Phenomenon observed after short-circuit, wire breakage on sensor..........37
(9) Checking the indoor electrical equipment...................................................37
(10) How to make sure of wireless remote control .............................................39
(11)
Inspection procedure for blown fuse on the indoor and outdoor unit PCB .....39
(12) Outdoor unit inspection points ....................................................................40
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3. ELECTRICAL WIRING .......................................................................................43
4. PIPING SYSTEM ................................................................................................46
5. INDOOR UNIT DISASSEMBLY METHOD .........................................................48
6. APPLICATION OPERATION MANUAL..............................................................54
The above illustration shows all
controls, but in practice only the
relevant parts are shown.
[View with the cover opened]
ON/OFF (luminous) button
Press to start operation, press again
to stop.
CANCEL button
This button cancels the ON timer, OFF
timer, and SLEEP operation.
Transmission section
Hi/ECO button
This button changes the HIGH POWER/
ECONOMY operation.
AIR FLOW (LEFT/RIGHT)/Child
lock button
This button changes the air flow (left/
right) direction.
SLEEP button
This button selects SLEEP operation.
AIR FLOW (UP/DOWN) button
This button changes the air flow (up/
down) direction.
NIGHT SETBACK button
This button sets NIGHT SETBACK
operation.
ACL switch
This switch resets the program to default
state.
TIME SET UP switch
This switch is used for setting the time.
This button use to set Child lock.
TEMP/TIMER button
This button sets the room temperature.
This button is used for setting the current
time and timer function.
OPERATION MODE select button
Each time the button is pressed, the
mode changes.
SILENT button
This button sets the SILENT operation.
ALLERGEN CLEAR button
This butt on se lec ts AL LER GEN
CLEAR operation.
ON TIMER button
This button selects ON TIMER operation.
OFF TIMER button
This button selects OFF TIMER operation.
MENU switch
This switch selects the SELF CLEAN
operation, Display brightness adjustment, Backlight setting,
Fan control in heating thermo-OFF, wireless LAN
communication setting, wireless LAN connection
setting and SILENT mode setting.
LCD screen
Press the button of the remote control
lights the backlight.
The backlight can be turned on/off.
FAN SPEED/PRESET button
Each time the button is pressed, the fan
speed changes.
This button sets the PRESET operation.
3D AUTO button
This button sets 3D AUTO operation.
Unit display section
RUN light (green)
• Illuminates during operation.
•Blinks slowly when SELF CLEAN operation
(3 seconds ON, 1 second OFF).
•Blinks when air flow is stopped to
prevent blowing out of cold air in
heating operation. (1.5 seconds ON,
0.5 seconds OFF)
This button can be used for turning on/off
the unit when a remote control is not available.
Unit ON/OFF button
TIMER light (yellow)
Illuminates during TIMER operation.
Remote control signal receiver
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1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
(1) Operation control function by wireless remote control
The above illustration shows all
controls, but in practice only the
relevant parts are shown.
[View with the cover opened]
ON/OFF (luminous) button
Press to start operation, press again
to stop.
CANCEL button
This button cancels the ON timer, OFF
timer, and SLEEP operation.
Transmission section
Hi/ECO button
This button changes the HIGH POWER/
ECONOMY operation.
AIR FLOW (LEFT/RIGHT)/Child
lock button
This button changes the air flow (left/
right) direction.
SLEEP button
This button selects SLEEP operation.
AIR FLOW (UP/DOWN) button
This button changes the air flow (up/
down) direction.
NIGHT SETBACK button
This button sets NIGHT SETBACK
operation.
ACL switch
This switch resets the program to default
state.
TIME SET UP switch
This switch is used for setting the time.
This button use to set Child lock.
TEMP/TIMER button
This button sets the room temperature.
This button is used for setting the current
time and timer function.
OPERATION MODE select button
Each time the button is pressed, the
mode changes.
SILENT button
This button sets the SILENT operation.
ALLERGEN CLEAR button
This butt on se lec ts AL LER GEN
CLEAR operation.
ON TIMER button
This button selects ON TIMER operation.
OFF TIMER button
This button selects OFF TIMER operation.
MENU switch
This switch selects the SELF CLEAN
operation, Display brightness adjustment, Backlight setting,
Fan control in heating thermo-OFF, wireless LAN
communication setting, wireless LAN connection
setting and SILENT mode setting.
LCD screen
Press the button of the remote control
lights the backlight.
The backlight can be turned on/off.
FAN SPEED/PRESET button
Each time the button is pressed, the fan
speed changes.
This button sets the PRESET operation.
3D AUTO button
This button sets 3D AUTO operation.
Unit display section
RUN light (green)
• Illuminates during operation.
•Blinks slowly when SELF CLEAN operation
(3 seconds ON, 1 second OFF).
•Blinks when air flow is stopped to
prevent blowing out of cold air in
heating operation. (1.5 seconds ON,
0.5 seconds OFF)
This button can be used for turning on/off
the unit when a remote control is not available.
Unit ON/OFF button
TIMER light (yellow)
Illuminates during TIMER operation.
Remote control signal receiver
Operation section
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'09•SRK-DB-087D
Jumper wire (JA2)
(2)ࠉUnit ON/OFF button
(a) Operation
(b) Details of operation
(3)ࠉAuto restart function
(a)
(b)
(i)
(ii)
(4)Custom cord switching procedure
(a) Modifying the indoor printed circuit board
(b) Modifying the wireless remote control
(i)
(ii)
Cut
Function
Operation mode
Room temperature
setting
Fan speed Flap/Louver Timer switch
COOL
HEAT
whether to go into the COOL or HEAT modes.
room
Jumper wire (J1)
'09•SRK-DB-087D
(2)ࠉUnit ON/OFF button
(a) Operation
(b) Details of operation
(3)ࠉAuto restart function
(a)
(b)
(i)
(ii)
(J170)
(4)ࠉCustom cord switching procedure
(a) Modifying the indoor printed circuit board
(b) Modifying the wireless remote control
1)
2)
Function
Operation mode
Indoor temperature
setting
Fan speed Flap/Louver Timer Switch
COOL
DRY
HEAT
(J171)
Unit ON/OFF button
Jumper wire (J170)
In case two air-conditioners are installed in the same room, apply this setting so that one unit can be operated with only one
remote control.
(a)ࠉSetting the wireless remote control
(i) Slide the cover and take out the batteries.
(ii) Disconnect the switching line next to the battery with wire cutters.
(iii) Set the batteries and cover again.
(b)ࠉSetting 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 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 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 sound is emitted, start the setting from the beginning again.)
(4)ࠉInstalling two air-conditioners in the same room
wireless wireless
Disconnect
Unit ON/OFF button
Reception
Peep
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(5) Selection of the annual cooling function
(a) The annual cooling control is valid from factory default setting. It is possible to
disable by cutting jumper wire (J3), or changing the setting of DIP switch (SW2-
4) on the interface kit (option) PCB if it is connected.
Notes: (1) Default states of the jumper wire (J3) 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 (TH2) detects below 5°C, the indoor
unit speed is switched to 8th step.
(ii)
If the outdoor air temperature sensor (TH 2 ) detects higher than 10°C, the indoor fan speed is changed to the normal control
speed.
Jumper wire (J172)
ON
5 10
OFF
Outdoor air temperature ( C)
Jumper wire
(J3)
Interface kit
(SC-BIKN2-E)
SW2-4
Function
Shorted ON Enabled
Shorted OFF Disabled
Open ON Disabled
Open OFF Disabled
(7)
 High power operation
Pressing the HI POWER/ECONOMY button intensifies the operating power and initiates powerful cooling and heating operation
for 15 minutes continuously. The wireless remote control displays HIGH POWER mark 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/ECONOMY button again to cancel the HIGH POWER operation.
(b) HIGH POWER operation is not available during the DRY and the ON timer to OFF 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 cancelled.
①When the HI POWER/ECONOMY button is pressed again
②When the operation mode is changed
③When it has been 15 minutes since HIGH POWER operation has started
④When the 3D AUTO botton is pressed
⑤When the SILENT botton is pressed
⑥When the NIGHT SETBACK botton is pressed
(e) Not operable while the air-conditioner is OFF.
(f) After HIGH POWER operation, the sound of refrigerant flowing may be heard.
(6) Heating only function
(a) Heating only function is enabled by disconnecting the jumper wire(J4).
(b) Content of control
Operation mode setting Operation mode
COOL/DRY/FAN
HEATAUTO/HEAT
FAN
'09•SRK-DB-087D
Jumper wire (JA2)
(2)ࠉUnit ON/OFF button
(a) Operation
(b) Details of operation
(3)ࠉAuto restart function
(a)
(b)
(i)
(ii)
(4)Custom cord switching procedure
(a) Modifying the indoor printed circuit board
(b) Modifying the wireless remote control
(i)
(ii)
Cut
Function
Operation mode
Room temperature
setting
Fan speed Flap/Louver Timer switch
COOL
HEAT
whether to go into the COOL or HEAT modes.
room
Jumper wire (J1)
Jumper wire (J3)
Jumper wire (J4)
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'09•SRK-DB-087D
(9
)Air flow direction adjustment
(a) Flap
(b) Louver
(c) Swing
(i)
(ii)
(d) Memory flap (Flap or louver stopped)
COOL, DRY, FAN
Wireless remote
control display
HEAT
Approx. 20°
Approx. 25°
Approx. 30°
Approx. 35°
Approx. 40°
Approx. 45° Approx. 65°
(Swing)
(Flap stopped)
Approx. 50°
Approx. 55°
Approx. 65°

Angle of flap from horizontal
Center installation
Wireless remote
control display
Right end installation
Left end installation

Angle of louver
Center
Left
approx. 10°
Right approx. 20°
Center Center
Right approx. 30°
Right approx. 10° Right approx. 20° Right approx. 30°
(Louver stopped)
(Swing)(Spot)(Wide)
In HEAT operationIn COOL, DRY, FAN operation
Approx. 35°
Approx. 65°
Approx.
20°
Approx. 55°
Air flow direction can be adjusted with by AIR FLOW (UP/DOWN) and (LEFT/RIGHT) button on the wireless
remote control.
Every time when you press the AIR FLOW
Every time when you press the AIR FLOW
Left approx. 30°
Left approx. 30°
Left approx. 20°
Left
approx. 20°
CenterCenter
(8) Economy operation
Pressing the HI POWER/ECONOMY button initiates 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 ECONOMY 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 or ALLERGEN CLEAR operation
(b) When the following operation are set, ECONOMY operation will be cancelled.
①When the HI POWER/ECONOMY button is pressed again
②When the operation mode is changed from 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
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'09•SRK-DB-087D
(9)Air flow direction adjustment
(a) Flap
(b) Louver
(c) Swing
(i)
(ii)
(d) Memory flap (Flap or louver stopped)
COOL, DRY, FAN
Wireless remote
control display
HEAT
Approx. 20°
Approx. 25°
Approx. 30°
Approx. 35°
Approx. 40°
Approx. 45° Approx. 65°
(Swing)
(Flap stopped)
Approx. 50°
Approx. 55°
Approx. 65°

Angle of flap from horizontal
Center installation
Wireless remote
control display
Right end installation
Left end installation

Angle of louver
Center
Left approx. 10°
Right approx. 20°
Center Center
Right approx. 30°
Right approx. 10° Right approx. 20° Right approx. 30°
(Louver stopped)
(Swing)(Spot)(Wide)
In HEAT operationIn COOL, DRY, FAN operation
Approx. 35°
Approx. 65°
Approx.
20°
Approx. 55°
Air flow direction can be adjusted with by AIR FLOW (UP/DOWN) and (LEFT/RIGHT) button on the wireless
remote control.
Every time when you press the AIR FLOW
Every time when you press the AIR FLOW
Left approx. 30°
Left approx. 30°
Left
approx. 20°
Left approx. 20°
CenterCenter
'09•SRK-DB-087D
(10)
3D auto operation
(a)
(i)
(ii)
(b)
Cooling
Air flow selection
Operation mode AUT
OH
I MED LO ULO
Heating
Room temp. – Setting temp. >5°C
Room temp. – Setting temp. 5°C
Setting temp. – Room temp. >5°C Setting temp. – Room temp. 5°C
HIGH POWER AUTO HI MED LO ULO
HIGH POWER AUTO
<
=
<
=
Flap
Louver
Cooling
Up/down swing
Heating
Wide (Fixed)Center (Fixed)
Flap
Louver
Cooling Heating
Left/right swing
Horizontal blowing (Fixed) Slant forwardl blowing (Fixed)
Flap
Louver
Cooling Heating
Wide (Fixed)
Flap
Louver
Cooling Heating
Horizontal blowing (Fixed) Slant forwardl blowing (Fixed)
Operation mode
Room temp. – Setting temp. 2°C
Setting temp. – Room temp. 2°C
Heating
Cooling
Air flow direction contorol
2°C < Setting temp. – Room temp. 5°C
2°C <
Room temp. – Setting temp. 5°C Room temp. – Setting temp. > 5°C
Setting temp. – Room temp. > 5°C
The control in 4) continues. Control returns to the control in 2). Control returns to the control in 1).
The control in 4) continues. Control returns to the control in 2). Control returns to the control in 1).
<
=
<
=
<
=
<
=
Wide (Fixed)
Flap
Louver
Horizontal blowing (Fixed)
1)
2)
3)
4)
5)
3
4
Fan speed
During cooling and heating (Including auto cooling and heating)
setting temp.
Up/down swing
Center (Fixed)
During DRY operation
room
Room Room
room
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'09•SRK-DB-087D
(b)
Sleep timer operation
(11)Timer operation
(a) Comfort start-up (ON timer operation)
(c) OFF timer operation
(14)Air flow range setting
(a)
Setting
(i) If the air-conditioning unit is running, press the ON/OFF button to stop.
(ii) Press the AIR FLOW U/D (UP/DOWN) button and the
AIR FLOW L/R (LEFT/RIGHT) button together for 5 seconds
or more.
(iii)
Setting the air-conditioning installation location.
(iv) Press the ON/OFF button.
Air flow range Air flow rangeAir flow range
(Left end installation) (Center installation) (Right end installation)
(Center installation)
L/R
L/R
(Right end installation) (Left end installation)
The unit starts the operation 5 to 60 minutes earlier so that the room can approach optimum temperature at ON timer.
The OFF timer can be set at a specific time (in 10-minute units) within a 24-hour period.
(d)
Weekly timer operation
Up to 4 programs with timer operation (ON timer / OFF timer) are available for each day of the week.
Take the air-conditioner location into account and adjust the left/right air flow range to maximize air-conditioning.
'09•SRK-DB-087D
(10)3D auto operation
(a)
(i)
(ii)
(b)
Cooling
Air flow selection
Operation mode AUTOHI MED LO ULO
Heating
Room temp. – Setting temp. >5°C
Room temp. – Setting temp. 5°C
Setting temp. – Room temp. >5°C Setting temp. – Room temp. 5°C
HIGH POWER AUTO HI MED LO ULO
HIGH POWER AUTO
<
=
<
=
Flap
Louver
Cooling
Up/down swing
Heating
Wide (Fixed)Center (Fixed)
Flap
Louver
Cooling Heating
Left/right swing
Horizontal blowing (Fixed) Slant forwardl blowing (Fixed)
Flap
Louver
Cooling Heating
Wide (Fixed)
Flap
Louver
Cooling Heating
Horizontal blowing (Fixed) Slant forwardl blowing (Fixed)
Operation mode
Room temp. – Setting temp. 2°C
Setting temp. – Room temp. 2°C
Heating
Cooling
Air flow direction contorol
2°C < Setting temp. – Room temp. 5°C
2°C <
Room temp. – Setting temp. 5°C Room temp. – Setting temp. > 5°C
Setting temp. – Room temp. > 5°C
The control in 4) continues. Control returns to the control in 2). Control returns to the control in 1).
The control in 4) continues. Control returns to the control in 2). Control returns to the control in 1).
<
=
<
=
<
=
<
=
Wide (Fixed)
Flap
Louver
Horizontal blowing (Fixed)
1)
2)
3)
4)
5)
3
4
Fan speed
During cooling and heating (Including auto cooling and heating)
setting temp.
Up/down swing
Center (Fixed)
During DRY operation
room
Room Room
room
Note Timer operation from wireless remote control becomes invalid when you connect the interface kit (such as SC-BIKN2-E).
Note Timer function used with wired remote control / WF-RAC (Smartphone)
The following timer functions that have be set from the wireless remote control are cancelled when the operating status of the indoor unit changes due to
signals from the wired remote control or WF-RAC (Smartphone).
At this time, the operational status of the indoor unit is different from the wireless remote control display.
Therefore it is recommended to only set one of the timers.
• SLEEP TIMER operation
• OFF TIMER operation
• ON TIMER operation
• SLEEP TIMER + ON TIMER operation
• PROGRAM TIMER operation
(d) Combination of patterns which can be set for the timer operations
Sleep timer
OFF timer
ON timer
Sleep timer
Í

OFF timer
Í

ON timer


Notes (1)
: Allowed Í: Not
(2) Since the ON timer, Sleep timer and OFF timer are set in parallel, when the times
to turn ON and OFF the air-conditioner are duplicated, the setting of the OFF timer
has priority.
Item
Item
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(12) Silent operation
When the silent operation is set, the unit operates by dropping the outdoor fan speed and the compressor speed.
Outdoor fan speed
(Upper limit)
Compressor speed
(Upper limit)
Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating
SRK20ZTL-W SRK25ZTL-WSRK15ZTL-W
Mode1 Mode2 Mode1 Mode2 Mode1 Mode2
4th speed
21 rps
3th speed
26 rps
4th speed
15 rps
3th speed
20 rps
4th speed
32 rps
3th speed
38 rps
4th speed
15 rps
3th speed 4th speed 3th speed 4th speed 3th speed
25 rps 38 rps 38 rps 20 rps 25 rps
Outdoor fan speed
(Upper limit)
Compressor speed
(Upper limit)
Cooling Heating Cooling Heating Cooling Heating Cooling Heating
SRK50ZTL-WSRK35ZTL-W
Mode1 Mode2 Mode1 Mode2
4th speed
49 rps
3th speed
48 rps
4th speed
32 rps
3th speed
32 rps
4th speed
54 rps
3th speed
53 rps
3th speed
36 rps
3th speed
35 rps
(14) Air flow range setting
(a) Setting
(i) If the air-conditioning unit is running, press the ON/OFF button to stop.
(ii) Press the AIR FLOW U/D (UP/DOWN) button and the
AIR FLOW L/R (LEFT/RIGHT) button together for 5 seconds
or more.
(iii) Setting the air-conditioning installation location.
Air flow range
L/R
L/R
Take the air-conditioner location into account and adjust the left/right air flow range to maximize air-conditioning.
・Mode1 and Mode2 can be set only from remote control.
・Mode1 and Mode2 can be switched as follows by remote control.
(13) Night setback operation
When the night setback operation is set, the heating operation starts with the setting temperature at 10℃.
(i), (iv)
(ii), (iii)
(ii)
This mode can reduce the noise from the outdoor unit.
This mode is ever more silently than the SILENT mode 1.
2Select the SILENT mode by pressing “ or (TEMP/
TIMER)” button.
Select the SILENT mode setting by pressing the MENU
switch.
1
SILENT mode 1
Initial
display
SILENT mode 2
Press the ON/OFF button.
3
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(Center installation) (Right end installation) (Left end installation)
(15) Display brightness adjustment
This function can be used when it is necessary to adjust the brightness of unit display.
Note When the unit displays self diagnosis or service mode, brightness level is always LV2.
Brightness level Run light Timer light
LV2
50%
0%
LV1
LV0
100%
20%
0%
60%
(16) Wireless LAN connection function
(a) Operating conditions
When a signal of wireless LAN connection setting was received from a remote control during all air-conditioners stop
(b) Detail of operation
(i) A signal which corresponds to the signal received from a remote control is sent to air-conditioner.
(ii)
(c) Reset conditions
(i) When a reception complete signal was received from interface
(ii) When an interface communication setting OFF signal was received from a remote control
(17) Fan control during heating thermostat OFF
(i) Following fan controls during the heating thermostat OFF can be selected with the wireless remote control.
1) Normal thermostat operation 2) Fireplace 3) Interval 4) Stop
(ii) When the “Normal thermostat operation” is selected, the indoor fan is controlled by HOT KEEP.
(iii) When the “Fireplace” is selected, it is operated with the set fan speed also in the thermostat OFF condition.
(iv) If the “Interval” is selected, following controls are performed:
1) If the thermostat is turned OFF during the heating operation, the indoor unit turns OFF the indoor fan.
①tap for 1 minute.
3) After operating at ①tap for 1 minute, the indoor fan moves to the state of 1) above.
(v) When the “Stop” is selected, the fan on the indoor unit of which the thermostat has been turned OFF, is turned OFF.
Note To use “Stop” function, additional work in which the suction temperature sensor can detect the room temperature appropriately is required.
(iv) Press the ON/OFF button.
Air flow range Air flow rangeAir flow range
(Left end installation) (Center installation) (Right end installation)
'22 • SRK-SM-349
-
10
-

35
35
(18) Outline of heating operation
(a) Operation of major functional components in heating mode
(b) Details of control at each operation mode (pattern)
(i) Fuzzy operation
(ii) Hot keep operation
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
(c) Defrost operation
(i)
1)
2)
3)
4)
−
Model
Fan speed
Auto
MED
HI
LO
ULO
*When a wired remote control is connected, a signal of a wired remote control is priority. HOT KEEP, Fireplace,
Interval and Stop can be established.
In the case, indoor air temperature is detected by sensor on the wired remote control.
During the heating operation, the indoor fan speed can be controlled based on the temperature of the indoor heat
exchanger (Th2) to prevent blowing out of cold air.
are satisfied.)
(Total compressor operation time)
After finish of defrost operation
C or less for 3 minutes continuously.
(Total compressor operation time)
20-110rps
20-110rps
20-110rps
20-60rps
20-44rps
SRK15
20-110rps
20-110rps
20-110rps
20-70rps
20-44rps
SRK20
20-115rps
20-115rps
20-115rps
20-84rps
20-50rps
SRK25
20-115rps
20-115rps
20-115rps
20-96rps
20-50rps
20-110rps
20-110rps
20-100rps
20-80rps
20-50rps
SRK35 SRK50
is as following.
(TH1)
-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 SRK15-35 Model SRK50
'22 • SRK-SM-349
-
11
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35
35
(model SRK50 : 10 )
'09•SRK-DB-087D
(18)ࠉOutline of heating operation
(a) Operation of major functional components in heating mode
(b) Details of control at each operation mode (pattern)
(i) Fuzzy operation
(ii) Hot keep operation
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
(c) Defrost operation
(i)
1)
2)
3)
4)
5)
1)
2)
−
(ii)
Model
Fan speed
Auto
MED
HI
LO
ULO
*When a wired remote control is connected, a signal of a wired remote control is priority. HOT KEEP, Fireplace,
Interval and Stop can be established.
In the case, indoor air temperature is detected by sensor on the wired remote control.
During the heating operation, the indoor fan speed can be controlled based on the temperature of the indoor heat
exchanger (Th2) to prevent blowing out of cold air.
are satisfied.)
is satisfied.)
(Total compressor operation time)
After finish of defrost operation
C or less for 3 minutes continuously.
(Total compressor operation time)
20-115rps
20-115rps
20-86rps
20-70rps
20-44rps
SRK20
20-115rps
20-115rps
20-104rps
20-84rps
20-54rps
SRK25
20-115rps
20-115rps
20-108rps
20-96rps
20-60rps
SRK35
20-110rps
20-110rps
20-106rps
20-94rps
20-63rps
SRK50
Continued operation time of defrost operation →For more than 15 minutes
For SRK15, 20, if the outdoor air temperature (TH2) is lower than -5
°C, the outdoor heat exchanger
temperature (TH1) is above 10°C or 5°C for more than 3 minutes continuously.
In case satisfied all of following conditions.
• Connect compressor speed 0 rps 10 times or more.
• Satisfy 1), 2) and 3) conditions above.
• Outdoor air temperature is 3°C or less.
is as following.
*When a wired remote control is connected, a signal of a wired remote control is priority. HOT KEEP, Fireplace,
Interval and Stop can be established.
In the case, indoor air temperature is detected by sensor on the wired remote control.
(TH2 (SRK50 : TH1))
(TH1)
'09•SRK-DB-087D
(b)
(i)
(ii)
(iii)
(c)
(d)
27.5
25.5
18.0
18 30
(19)Outline of cooling operation
(a)ࠉOperation of major functional components in cooling mode
(d) Countermeasure for excessive temperature rise
If it feels excessive temperature rise in heating operation, setting temperature can be lower.
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
(21)ࠉOutline of automatic operation
(a) Determination of operation mode
Heating
Dehumidifying
Cooling
Indoor air temperature (˚C)
Outdoor air temperature (˚C)
Signals of wireless remote control (Display)
–6 –5 –4 –3 –2 –1 ±0+1+2+3+4+5+6
Setting
temperature
Cooling
Dehumidifying
Heating
A
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 j-
udgment of operation mode is cancelled.
(e) When the unit is operated automatically with the wired remote control connected, the cooling operation is controlled according to
the display temperatures while the setting temperature is compensated by 1 during dehumidifying or by 2
during heating.
(b) Detail of control in each mode (Pattern)
(i) Fuzzy operation
15-76rps
15-76rps
15-60rps
15-52rps
SRK25
15-98rps
15-98rps
15-80rps
15-60rps
SRK35SRK50
15-70rps
15-70rps
15-56rps
15-45rps
SRK20
15-66rps
15-66rps
15-52rps
15-42rps
15-46rps15-46rps
20-100rps
20-100rps
20-82rps
20-66rps
20-40rps15-36rps15-34rps
SRK15
Model
Fan speed
Auto
MED
ULO
HI
LO
Max. 15 minutes
Heating operation
Defrost operation

Depends on an operation condition, the time can be longer than 7 minutes.
2 - 7 minutes 
Hot keep operation
(i) Setting
(ii) Contents of control
Signal of wireless remote control (Display)
Unit : °C
18
20
18
19
21
19
20
22
20
21
23
21
22
24
22
23
25
23
24
26
24
25
27
25
26
28
26
27
29
27
28
30
28
29
31
29
30
32
30
Before setting
After setting
Push ON/OFF button 30 seconds or more after turn on the power source and operate the air-conditioner
at least once time, At completion of the setting, the indoor unit emits a buzzer sound “Pip”.
(iii)
Reset condition
Push ON/OFF button 30 seconds or more during setting this mode. At completion of the reset, the indoor
unit emits a buzzer sound “PiPiPi”.
'09•SRK-DB-087D
(b)
(i)
(ii)
(iii)
(c)
(d)
27.5
25.5
18.0
18 30
(19)
Outline of cooling operation
(a)ࠉOperation of major functional components in cooling mode
(d) Countermeasure for excessive temperature rise
If it feels excessive temperature rise in heating operation, setting temperature can be lower.
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
(21)ࠉOutline of automatic operation
(a) Determination of operation mode
Heating
Dehumidifying
Cooling
Indoor air temperature (˚C)
Outdoor air temperature (˚C)
Signals of wireless remote control (Display)
–6 –5 –4 –3 –2 –1 ±0+1+2+3+4+5+6
Setting
temperature
Cooling
Dehumidifying
Heating
A
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 j-
udgment of operation mode is cancelled.
(e) When the unit is operated automatically with the wired remote control connected, the cooling operation is controlled according to
the display temperatures while the setting temperature is compensated by 1 during dehumidifying or by 2
during heating.
(b) Detail of control in each mode (Pattern)
(i) Fuzzy operation
15-76rps
15-76rps
15-60rps
15-52rps
SRK25
15-98rps
15-98rps
15-80rps
15-60rps
SRK3
5S
RK50
15-70rps
15-70rps
15-56rps
15-45rps
SRK20
15-66rps
15-66rps
15-52rps
15-42rps
15-46rps15-46rps
20-100rps
20-100rps
20-82rps
20-66rps
20-40rps15-36rps15-34rps
SRK15
Model
Fan speed
Auto
MED
ULO
HI
LO
Note Setting temperature can be set in 0.5℃increments.
'22 • SRK-SM-349
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'09•SRK-DB-087D
(b)
(i)
(ii)
(iii)
(c)
(d)
27.5
25.5
18.0
18 30
(19)Outline of cooling operation
(a)ࠉOperation of major functional components in cooling mode
(d) Countermeasure for excessive temperature rise
If it feels excessive temperature rise in heating operation, setting temperature can be lower.
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
(21)
ࠉOutline of automatic operation
(a) Determination of operation mode
Heating
Dehumidifying
Cooling
Indoor air temperature (˚C)
Outdoor air temperature (˚C)
Signals of wireless remote control (Display)
–6 –5 –4 –3 –2 –1 ±0+1+2+3+4+5+6
Setting
temperature
Cooling
Dehumidifying
Heating
A
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 j-
udgment of operation mode is cancelled.
(e) When the unit is operated automatically with the wired remote control connected, the cooling operation is controlled according to
the display temperatures while the setting temperature is compensated by 1 during dehumidifying or by 2
during heating.
(b) Detail of control in each mode (Pattern)
(i) Fuzzy operation
15-76rps
15-76rps
15-60rps
15-52rps
SRK25
15-98rps
15-98rps
15-80rps
15-60rps
SRK35SRK50
15-70rps
15-70rps
15-56rps
15-45rps
SRK20
15-66rps
15-66rps
15-52rps
15-42rps
15-46rps15-46rps
20-100rps
20-100rps
20-82rps
20-66rps
20-40rps15-36rps15-34rps
SRK15
Model
Fan speed
Auto
MED
ULO
HI
LO
Heating
Cooling
SP: Setting temperature
SP
Room air
temperature (˚C)
28
Outdoor air temperature (˚C)
(b) Operation mode is changes when keep cooling and heating thermostat off 20 minutes and be satisfied with followingconditions.
If the setting temperature is changed with the remote control, the operation mode is judged immediately.
(c) When the unit is startedagain within one hour after the stop of automatic operation or whenthe automatic operation is
selected during heating, cooling or DRY mode, 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 signals
of the wireless remote control and the setting temperature.
(e) When the unit is operated automatically with the wired remote control, the cooling operation iscontrolled according to the
display temperatures while the setting temperature is compensated by ＋2℃ during heating.
※It can not be changed to heating mode if outdoor air temperature is 28℃or higher.
Heating SP: Setting temperature
Room air temperature(˚C)
Keep operation
mode
Cooling
Signals of wireless remote control (Display)
18 19 20 21 22 23 24 25 26 27 28 29 30
18 19 20 21 22 23 24 25 26 27 28 29 30
20 21 22 23 24 25 26 27 28 29 30 31 32
Setting
temperature
Cooling
Heating
SP＋1
SP−1
Unit : ℃
(20) Outline of dehumidifying (DRY) operation
The purpose is "Dehumidification", 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.
(i) Indoor unit fan speed and compressor are controlled by the area which is selected by the temperature difference.
Indoor fan speed
Area
D C B A
Me speed
Indoor
fan speed ULo(Lo) speed
Stop
Limited（Lower than
normal cooling operation）
Compressor Limited
speed Minimum （Lower than the speed in”Area A”）
Stop
Setting temperature
Difference between set temperature and room air temperature
When the outdoor air temperature and room air temperature are low in cooling operation, indoor unit can not operate in cooling, and
dehumidifying. In this case, the unit operates in heating to rise the room air temperature and after that start dehumidifying operation.
(a) Purpose of DRY mode
(b) Outline of control
(ii) The indoor unit checks the current area by every 5 minutes, and operates by the next checking.
(c) Other
Operation mode is determined by room air temperature and outdoor air temperature as following.
(a) Determination of operation mode
Note Setting temperature can be set in 0.5℃increments.
'22 • SRK-SM-349
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(22) Protective control function
(a) Dew prevention control (During cooling)
Prevents dewing on the indoor unit
(i) Operating conditions
When the following conditions have been satised for more than 30 minutes after starting operation
1) Compressor’s speed is 26 (model SRK50:28) rps or higher.
2) Detected value of humidity is 68% or higher.
(ii) Contents of operation
1) Air capacity control
Model
Item SRK15 SRK20 SRK25, 35 SRK50
ULO
Upper limit of
compressor's speed
RangeA: 34rps
RangeB: 28rps
RangeA: 36rps
RangeB: 28rps
RangeA: 46rps
RangeB: 46rps
RangeA: 40rps
RangeB: 28rps
Indoor fan 4th speed
LO
Upper limit of
compressor's speed
RangeA: 42rps
RangeB: 30rps
RangeA: 45rps
RangeB: 30rps
RangeA: 46rps
RangeB: 46rps
RangeA: 66rps
RangeB: 28rps
Indoor fan 5th speed Adaptable to compressor speed
AUTO, MED
Upper limit of
compressor's speed
RangeA: 52rps
RangeB: 52rps
RangeA: 56rps
RangeB: 52rps
RangeA: 55rps
RangeB: 55rps
RangeA: 82rps
RangeB: 40rps
Indoor fan Adaptable to compressor speed
HI
Upper limit of
compressor's speed
RangeA: 66rps
RangeB: 60rps
RangeA: 70rps
RangeB: 60rps
RangeA: 60rps
RangeB: 60rps
RangeA: 100rps
RangeB: 50rps
Indoor fan 7th speed Adaptable to compressor speed
Note Ranges A and B are as shown below.
2) When this control has continued for more than 30 minutes continuously,the following wind direction control is performed.
a) When the vertical wind direction is set at other than the vertical swing,the aps change to the horizontal position.
b) When the horizontal wind direction is set at other than the horizontal swing,the louver changes to the vertical position.
(iii) Reset condition
Humidity is less than 63%.
Humidity(%)
68 73
Range A
Range B
'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
(c) Cooling overload protective control
(i) Operating conditions
(ii) 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
Item SRK15-35 SRK50
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
(model SRK50 : 23 rps)
Depends on compressor speed
47°C or more
35 rps
The lower limit of compressor speed is set to 30 or 45 (model SRK50 : 27 or 35) 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 8th 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.
Outdoor air temperature (°C)
40 41 46 47
OFF
ON1
ON2
41°C or more
27 rps45 rps
(d) Cooling high pressure control
(i) Purpose
Prevents anomalous high pressure operation during cooling
(ii) Detector
Outdoor heat exchanger sensor (TH1).
(iii) Detail of operation
P1 P2 P3
Outdoor heat exchanger temperature (°C)
8(6)rps
(1)
8(6)rps
(1)
0rps
After lapse of 20(30) sec. or over
(3)
After lapse of 20(30) sec. or over
(3)
After lapse of 20(30) sec. or over
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3䉝, the speed is reduced by 8(6) rps at each 20(30) seconds.
(2) When the temperature is P3䉝㻌or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of P1-P2
(4) Values in ( ) are for the model SRK50.
䉝, if the compressor speed is been maintained and the operation has
continued for more than 20(30) seconds at the same speed, it returns to the normal cooling operation.
(3)
lower limit
speed 30 (model SRK50 : 29) rps
(Example) Compressor speed
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻝㻡㻙㻟㻡
㻿㻾㻷㻡㻜
㻾㼍㼚㼓㼑㻌㻮
㻾㼍㼚㼓㼑㻌㻭
㻾㼍㼚㼓㼑㻌㻮
Range A
31 32
Range B
㻠㻜
㻡㻟
㻠㻤
㻡㻟
㻠㻟
㻡㻤
㻡㻟
㻡㻤
㻠㻢
㻼㻝 㻼㻞
㼀㻴㻝
㻔
䉝
㻕
㻼㻟
㻢㻟
㻡㻡
㻢㻟
Outdoor air temperature (°C)
'09•SRK-DB-087D
(e) Cooling low outdoor air temperature protective control
(i) Operating conditions
(ii) Detail of operation
CDAB
OFF
EF
Upper 2
Lower 2
ON
ON
Upper 3
Lower 3
ON
Upper 1
Lower 1
Outdoor air temperature (°C)
(iii) Reset conditions
(f ) Heating high pressure control
(i) Purpose
(ii) Detector
(iii) Detail of operation
ABCD
Indoor heat exchanger temperature(°C)
4rps(1) 8rps(2)
8rps(2) 4rps(1)
0rps
After lapse of 10(20) sec. or over
(3)
After lapse of 10(20) sec. or over
(3)
After lapse of 10(20) sec. or over
(3)
lower limit
speed 30(27) rps
(Example)
Compressor
speed
Temperature list
Models SRK15-35
ABCD
RPSmin < 50
50 <
=RPSmin < 92
92 <
=< =
RPSmin 115
First time
After the
second times
Outdoor air temperature (˚C)
ABCDEF
(Models SRK15-35)
First time
After the
second times
Outdoor air temperature (˚C)
ABCD
(Model SRK50)
9
16 19
11
Note (1) Va lues in ( ) are for the model SRK50.
When the outdoor air temperature (TH2) is C °C or lower for 20 seconds continuously while the compressor speed is other than 0 rps.
Compressor speed: Upper/lower limit (rps)
Lower 3Upper 2Lower 2
Lower 1 Upper 1
Range ARange B
Upper 3
2624
Room air temperature (Υ)
50504430
50
Range A
Range B
−5044
60
6027
Release
Release −
SRK15-35
SRK50
1) It controls the upper and lower limit values for the compressor speed according to the following table.
2) It checks the outdoor air temperature (TH2) once every hour to judge the operation range.
When either of the following condition is satisfied
1) The outdoor air temperature (TH2) is D°C or higher.
2) The compressor speed is 0 rps.
fanspeed fan
When the indoor heat exchanger temperature is in the range of A-B °C, if the compressor speed is been maintained and the operation has continued for more
than 10(20) seconds at the same speed, it returns to the normal heating operation.
(5) Values in ( ) are for the model SRK50.
10(20)
10(20)
B-C
C-D
47
47.5
47.5 - 39
52
55
55 - 40
54
57
57 - 42
58
61
61
'22 • SRK-SM-349
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'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
(c) Cooling overload protective control
(i) Operating conditions
(ii) 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
Item SRK15-35 SRK50
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
(model SRK50 : 23 rps)
Depends on compressor speed
47°C or more
35 rps
The lower limit of compressor speed is set to 30 or 45 (model SRK50 : 27 or 35) 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 8th 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.
Outdoor air temperature (°C)
40 41 46 47
OFF
ON1
ON2
41°C or more
27 rps45 rps
(d) Cooling high pressure control
(i) Purpose
Prevents anomalous high pressure operation during cooling
(ii) Detector
Outdoor heat exchanger sensor (TH1).
(iii) Detail of operation
P1 P2 P3
Outdoor heat exchanger temperature (°C)
8(6)rps
(1)
8(6)rps
(1)
0rps
After lapse of 20(30) sec. or over
(3)
After lapse of 20(30) sec. or over
(3)
After lapse of 20(30) sec. or over
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3䉝, the speed is reduced by 8(6) rps at each 20(30) seconds.
(2) When the temperature is P3䉝㻌or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of P1-P2
(4) Values in ( ) are for the model SRK50.
䉝, if the compressor speed is been maintained and the operation has
continued for more than 20(30) seconds at the same speed, it returns to the normal cooling operation.
(3)
lower limit
speed 30 (model SRK50 : 29) rps
(Example) Compressor speed
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻝㻡㻙㻟㻡
㻿㻾㻷㻡㻜
㻾㼍㼚㼓㼑㻌㻮
㻾㼍㼚㼓㼑㻌㻭
㻾㼍㼚㼓㼑㻌㻮
Range A
31 32
Range B
㻠㻜
㻡㻟
㻠㻤
㻡㻟
㻠㻟
㻡㻤
㻡㻟
㻡㻤
㻠㻢
㻼㻝 㻼㻞
㼀㻴㻝
㻔
䉝
㻕
㻼㻟
㻢㻟
㻡㻡
㻢㻟
Outdoor air temperature (°C)
'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
(c) Cooling overload protective control
(i) Operating conditions
(ii) 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
Item SRK15-35 SRK50
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
(model SRK50 : 23 rps)
Depends on compressor speed
47°C or more
35 rps
The lower limit of compressor speed is set to 30 or 45 (model SRK50 : 27 or 35) 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 8th 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.
Outdoor air temperature (°C)
40 41 46 47
OFF
ON1
ON2
41°C or more
27 rps45 rps
(d) Cooling high pressure control
(i) Purpose
Prevents anomalous high pressure operation during cooling
(ii) Detector
Outdoor heat exchanger sensor (TH1).
(iii) Detail of operation
P1 P2 P3
Outdoor heat exchanger temperature (°C)
8(6)rps
(1)
8(6)rps
(1)
0rps
After lapse of 20(30) sec. or over
(3)
After lapse of 20(30) sec. or over
(3)
After lapse of 20(30) sec. or over
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3䉝, the speed is reduced by 8(6) rps at each 20(30) seconds.
(2) When the temperature is P3䉝㻌or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of P1-P2
(4) Values in ( ) are for the model SRK50.
䉝, if the compressor speed is been maintained and the operation has
continued for more than 20(30) seconds at the same speed, it returns to the normal cooling operation.
(3)
lower limit
speed 30 (model SRK50 : 29) rps
(Example) Compressor speed
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻝㻡㻙㻟㻡
㻿㻾㻷㻡㻜
㻾㼍㼚㼓㼑㻌㻮
㻾㼍㼚㼓㼑㻌㻭
㻾㼍㼚㼓㼑㻌㻮
Range A
31 32
Range B
㻠㻜
㻡㻟
㻠㻤
㻡㻟
㻠㻟
㻡㻤
㻡㻟
㻡㻤
㻠㻢
㻼㻝 㻼㻞
㼀㻴㻝
㻔 䉝 㻕
㻼㻟
㻢㻟
㻡㻡
㻢㻟
Outdoor air temperature (°C)
'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
(c) Cooling overload protective control
(i) Operating conditions
(ii) 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
Item SRK15-35 SRK50
Outdoor air temperature
Lower limit speed
Model
1)
2)
1)
2)
1)
2)
1)
2)
(iii) Reset conditions
(model SRK50 : 23 rps)
Depends on compressor speed
47°C or more
35 rps
The lower limit of compressor speed is set to 30 or 45 (model SRK50 : 27 or 35) 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 8th 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.
Outdoor air temperature (°C)
40 41 46 47
OFF
ON1
ON2
41°C or more
27 rps45 rps
(d) Cooling high pressure control
(i) Purpose
Prevents anomalous high pressure operation during cooling
(ii) Detector
Outdoor heat exchanger sensor (TH1).
(iii) Detail of operation
P1 P2 P3
Outdoor heat exchanger temperature (°C)
8(6)rps
(1)
8(6)rps
(1)
0rps
After lapse of 20(30) sec. or over
(3)
After lapse of 20(30) sec. or over
(3)
After lapse of 20(30) sec. or over
Notes (1) When the outdoor heat exchanger temperature is in the range of P2-P3䉝, the speed is reduced by 8(6) rps at each 20(30) seconds.
(2) When the temperature is P3䉝㻌or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of P1-P2
(4) Values in ( ) are for the model SRK50.
䉝, if the compressor speed is been maintained and the operation has
continued for more than 20(30) seconds at the same speed, it returns to the normal cooling operation.
(3)
lower limit
speed 30 (model SRK50 : 29) rps
(Example) Compressor speed
㻾㼍㼚㼓㼑㻌㻭
㻿㻾㻷㻝㻡㻙㻟㻡
㻿㻾㻷㻡㻜
㻾㼍㼚㼓㼑㻌㻮
㻾㼍㼚㼓㼑㻌㻭
㻾㼍㼚㼓㼑㻌㻮
Range A
31 32
Range B
㻠㻜
㻡㻟
㻠㻤
㻡㻟
㻠㻟
㻡㻤
㻡㻟
㻡㻤
㻠㻢
㻼㻝 㻼㻞
㼀㻴㻝
㻔
䉝
㻕
㻼㻟
㻢㻟
㻡㻡
㻢㻟
Outdoor air temperature (°C)
'09•SRK-DB-087D
(e) Cooling low outdoor air temperature protective control
(i) Operating conditions
(ii) Detail of operation
CDAB
OFF
EF
Upper 2
Lower 2
ON
ON
Upper 3
Lower 3
ON
Upper 1
Lower 1
Outdoor air temperature (°C)
(iii) Reset conditions
(f ) Heating high pressure control
(i) Purpose
(ii) Detector
(iii) Detail of operation
ABCD
Indoor heat exchanger temperature(°C)
4rps(1) 8rps(2)
8rps(2) 4rps(1)
0rps
After lapse of 10(20) sec. or over
(3)
After lapse of 10(20) sec. or over
(3)
After lapse of 10(20) sec. or over
(3)
lower limit
speed 30(27) rps
(Example)
Compressor
speed
Temperature list
Models SRK15-35
ABCD
RPSmin < 50
50 <
=RPSmin < 92
92 <
=< =
RPSmin 115
First time
After the
second times
Outdoor air temperature (˚C)
ABCDEF
(Models SRK15-35)
First time
After the
second times
Outdoor air temperature (˚C)
ABCD
(Model SRK50)
9
16 19
11
Note (1) Va lues in ( ) are for the model SRK50.
When the outdoor air temperature (TH2) is C °C or lower for 20 seconds continuously while the compressor speed is other than 0 rps.
Compressor speed: Upper/lower limit (rps)
Lower 3Upper 2Lower 2
Lower 1 Upper 1
Range ARange B
Upper 3
2624
Room air temperature (Υ)
50504430
50
Range A
Range B
−5044
60
6027
Release
Release −
SRK15-35
SRK50
1) It controls the upper and lower limit values for the compressor speed according to the following table.
2) It checks the outdoor air temperature (TH2) once every hour to judge the operation range.
When either of the following condition is satisfied
1) The outdoor air temperature (TH2) is D°C or higher.
2) The compressor speed is 0 rps.
fanspeed fan
When the indoor heat exchanger temperature is in the range of A-B °C, if the compressor speed is been maintained and the operation has continued for more
than 10(20) seconds at the same speed, it returns to the normal heating operation.
(5) Values in ( ) are for the model SRK50.
10(20)
10(20)
B-C
C-D
47
47.5
47.5 - 39
52
55
55 - 40
54
57
57 - 42
58
61
61
'22 • SRK-SM-349
-
15
-

'09•SRK-DB-087D
(e) Cooling low outdoor air temperature protective control
(i) Operating conditions
(ii) Detail of operation
CDAB
OFF
EF
Upper 2
Lower 2
ON
ON
Upper 3
Lower 3
ON
Upper 1
Lower 1
Outdoor air temperature (°C)
(iii) Reset conditions
(f ) Heating high pressure control
(i) Purpose
(ii) Detector
(iii) Detail of operation
ABCD
Indoor heat exchanger temperature(°C)
4rps(1) 8rps(2)
8rps(2) 4rps(1)
0rps
After lapse of 10(20) sec. or over
(3)
After lapse of 10(20) sec. or over
(3)
After lapse of 10(20) sec. or over
(3)
lower limit
speed 30(27) rps
(Example)
Compressor
speed
Temperature list
Models SRK15-35
ABCD
RPSmin < 50
50 <
=RPSmin < 92
92 <
=< =
RPSmin 115
First time
After the
second times
Outdoor air temperature (˚C)
ABCDEF
(Models SRK15-35)
First time
After the
second times
Outdoor air temperature (˚C)
ABCD
(Model SRK50)
9
16 19
11
Note (1) Va lues in ( ) are for the model SRK50.
When the outdoor air temperature (TH2) is
C
°C or lower for 20 seconds continuously while the compressor speed is other than 0 rps.
Compressor speed: Upper/lower limit (rps)
Lower 3Upper 2Lower 2
Lower 1 Upper 1
Range ARange B
Upper 3
2624
Room air temperature (Υ)
50504430
50
Range A
Range B
−5044
60
6027
Release
Release
−
SRK15-35
SRK50
1) It controls the upper and lower limit values for the compressor speed according to the following table.
2) It checks the outdoor air temperature (TH2) once every hour to judge the operation range.
When either of the following condition is satisfied
1) The outdoor air temperature (TH2) is D°C or higher.
2) The compressor speed is 0 rps.
fanspeed fan
When the indoor heat exchanger temperature is in the range of A-B °C, if the compressor speed is been maintained and the operation has continued for more
than 10(20) seconds at the same speed, it returns to the normal heating operation.
(5) Values in ( ) are for the model SRK50.
10(20)
10(20)
B-C
C-D
47
47.5
47.5 - 39
52
55
55 - 40
54
57
57 - 42
58
61
61
)
'09•SRK-DB-087D
(g) Heating overload protective control
(i) Indoor fan speed
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, 25, 35
(i)
ࠉ 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)ࠉDetail 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 < 35
40 <
=RPSmin < 80
80 <
=RPSmin < 115
49
52
52 - 43
54
57
57 - 46
55
58
58 - 47
55.5
62
35 <
=RPSmin < 40 49 - 52 54 - 57 55 - 58 55.5 - 62
62 - 52
a)
b)
c)
d)
The lower limit of compressor 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thermostat OFF, the speed is reduced to 0 rps.
fan speed is
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 speed other than 0 rps.
a)
b)
c)
d)
Taking the upper limit of compressor 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 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 thermostat OFF, the speed is reduced to 0 prs.
rps.
3) Reset conditions
1)
2)
30
Protective
control
ON1
ON2
Item Compressor speed
Low limit
30 rps
30 rps
Upper limit
78 rps
51 rps
The indoor fan speed is stepped up by 1 speed step. (Upper limit 9th speed)
When the outdoor air temperature (TH2) is 17°C or higher continues for 30 seconds while the compressor speed other than 0 rps.
When the outdoor air temperature (TH2) is 22°C or higher continues for 30 seconds while the compressor speed other than 0 rps.
The outdoor air temperature (TH2) is lower than 16°C.
The outdoor air temperature (TH2) is lower than 21°C.
The outdoor air temperature (TH2) is lower than 10°C.
Outdoor fan speed
It depends on compressor speed
2nd
Taking the upper limit of compressor speed at 60 rps, if the output speed obtained with the fuzzy calculation
exceeds the upper limit, the upper limit value is maintained.
'22 • SRK-SM-349
-
16
-

'09•SRK-DB-087D
(e) Cooling low outdoor air temperature protective control
(i) Operating conditions
(ii) Detail of operation
CDAB
OFF
EF
Upper 2
Lower 2
ON
ON
Upper 3
Lower 3
ON
Upper 1
Lower 1
Outdoor air temperature (°C)
(iii) Reset conditions
(f ) Heating high pressure control
(i) Purpose
(ii) Detector
(iii) Detail of operation
ABCD
Indoor heat exchanger temperature(°C)
4rps(1) 8rps(2)
8rps(2) 4rps(1)
0rps
After lapse of 10(20) sec. or over
(3)
After lapse of 10(20) sec. or over
(3)
After lapse of 10(20) sec. or over
(3)
lower limit
speed 30(27) rps
(Example)
Compressor
speed
Temperature list
Models SRK15-35
ABCD
RPSmin < 50
50 <
=RPSmin < 92
92 <
=< =
RPSmin 115
First time
After the
second times
Outdoor air temperature (˚C)
ABCDEF
(Models SRK15-35)
First time
After the
second times
Outdoor air temperature (˚C)
ABCD
(Model SRK50)
9
16 19
11
Note (1) Va lues in ( ) are for the model SRK50.
When the outdoor air temperature (TH2) is
C
°C or lower for 20 seconds continuously while the compressor speed is other than 0 rps.
Compressor speed: Upper/lower limit (rps)
Lower 3Upper 2Lower 2
Lower 1 Upper 1
Range ARange B
Upper 3
2624
Room air temperature (Υ)
50504430
50
Range A
Range B
−5044
60
6027
Release
Release
−
SRK15-35
SRK50
1) It controls the upper and lower limit values for the compressor speed according to the following table.
2) It checks the outdoor air temperature (TH2) once every hour to judge the operation range.
When either of the following condition is satisfied
1) The outdoor air temperature (TH2) is D°C or higher.
2) The compressor speed is 0 rps.
fanspeed fan
When the indoor heat exchanger temperature is in the range of A-B °C, if the compressor speed is been maintained and the operation has continued for more
than 10(20) seconds at the same speed, it returns to the normal heating operation.
(5) Values in ( ) are for the model SRK50.
10(20)
10(20)
B-C
C-D
47
47.5
47.5 - 39
52
55
55 - 40
54
57
57 - 42
58
61
61
)
(g) Heating overload protective control
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)
Note(1) Range A and B are as shown below.
Note(1) Range A and B are as shown below.
• Model SRK50
• Model SRK50
• Models SRK20 ~ 35
• Models SRK15-35
(i) ࠉ 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)ࠉDetail 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)
a)
b)
c)
d)
The lower limit of compressor 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thermostat OFF, the speed is reduced to 0 rps.
fan speed is
rps.
1) Operating conditions
2) Detail of operation
When the outdoor air temperature (TH2) is 11ºC or higher for 30 seconds continuously while the compressor speed other than 0 rps.
a)
b)
c)
d) Refer to the right table about the outdoor fan speed.
Taking the upper limit of compressor speed range at 90 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 speed is set to 27 rps and even if the calculated result becomes lower than that after
fuzzy calculation, the speed is kept to 27 rps. However, when the thermostat OFF, the speed is reduced to 0 prs.
rps.
3) Reset conditions
1)
2)
27
Protective
control
ON1
ON2
Item Compressor speed
Low limit
30 rps
30 rps
Upper limit
78 rps
51 rps
When the outdoor air temperature (TH2) is 22°C or higher for 30 seconds continuously while the compressor speed other than 0 rps.
The outdoor air temperature (TH2) is lower than 21°C.
The outdoor air temperature (TH2) is lower than 10°C.
Outdoor fan speed
It depends on compressor speed
2nd
Taking the upper limit of compressor speed at 60 rps, if the output speed obtained with the fuzzy calculation
exceeds the upper limit, the upper limit value is maintained.
Compressor speed : Upper/lower limit (rps)
Outdoor fan speed
Lower limit Upper limit
Range ARange B
40 Release602nd
Range A
Range B
Room air temperature( )Υ
21 23
Range A
Range B
Room air temperature( )Υ
21 23
Lower limitUpper limit
Range ARange B
Compressor speed : Upper/lower limit (rps)
Outdoor fan speed
ON127Release90It depends on
compressor speed
ON22727602nd
'22 • SRK-SM-349
-
17
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'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)
(ii)
Detail of operation
(h) Heating low outdoor temperature protective control
(iii)
(iii)
Reset conditions
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 SRK15-35
• Models SRK20 ~ 35
(i) ࠉ Operating conditions
When the outdoor air temperature (TH2) is lower than 4ºC for 30 seconds continuously while the
compressor speed is other than 0 rps
ࠉDetail of operation
The lower limit compressor speed is change as shown in the figure below.
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
ࠉ
Reset conditions
When either of the following condition is satisfied
1)
ࠉ The outdoor air temperature (TH2) becomes 6ºC.
2)
ࠉ The compressor speed is 0 rps.
When the outdoor air temperature (TH2) is lower than 2°C for 30 seconds continuously while the compressor
speed is other than 0 rps
The lower limit compressor speed is change as shown in the figure below.
Normal operation
Lower limit 27 rps
Lower limit 50 rps
Outdoor air temperature (°C)
46-6-8
(i) Compressor overheat protection
(i) Purpose
(ii) Detail of operation
1)
(Example)
Compressor speed
Discharge pipe temperature (˚C)
90 100 110
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor overheat.
(TH2) 4
(TH3)
Lower limit 45 rps (models SRK25, 35 : 55rps)
Lower limit 40 rps
Lower limit 38 rps (models SRK25, 35 : 40rps)
Normal operation
402-10 -8
Outdoor air temperature (°C)
'22 • SRK-SM-349
-
18
-

'09•SRK-DB-087D
(i) Compressor overheat protection
(i) Purpose:
(ii) Detail of operation
1)
Discharge pipe temperature (˚C)
(Example) Fuzzy
90 100 110
2)
(j) Current safe
Purpose
Detail of operation
(k) Current cut
Purpose
Detail of operation
(l) Outdoor unit failure
(m) Indoor fan motor protection
Cooling Heating
Lower limit speed
Mode
Model
(iii) ࠉ Reset conditions: When either of the following condition is satisfied.
1)
ࠉ The outdoor air temperature (TH2) becomes 6ºC ~ 11ºC.
2)
ࠉ The compressor command speed is 0 rps.
15 rps
20 rps
20 rps
20 rps
item (i), (ii) is satisfied. Once the unit is stopped by this function, it is not
min-1
100-110°C
90 -100°C
90 -100°C
SRK15 - 35
SRK50
(i)
(ii)
(i)
(ii)
(i)
(ii)
air-conditioning.
has elapsed
air-conditioner
'09•SRK-DB-087D
(n) Serial signal transmission error protection
(i)
(i)
(ii)
Purpose
(ii) Detail of operation
(o) Rotor lock
(p) Outdoor fan motor protection
(q) Outdoor fan control at low outdoor temperature
Cooling
1) Operating conditions
(r) Refrigeration cycle system protection
(i) Starting conditions
2)
Detail of operation
3) Reset conditions
Heating
1) Operating conditions
2) Detail of operation
3) Reset conditions
Outdoor temperature > 15˚C
Outdoor temperature
Outdoor temperature > 0˚C
0˚C
>
=
15˚C
Outdoor fan
a)
b)
a) 24
b)
a)
b)
1)
2)
c)
When 5 minutes have elapsed after the compressor ON or the completion of the defrost operation
Other than the defrost operation
(ii) Contents of control
1)
(iii) Reset condition
When the compressor has been turned OFF
2)
When the conditions of (i) above are satisfied , 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 air temperature (Th1) and indoor
heat exchanger temperature (Th2) have satisfied the conditions in the following table for 10(SRK50:5) minutes
Compressor speed (N)Operation mode
Cooling
Heating (1)
Room air temperature (Th1)
Th1−4<Th2
Room air temperature (Th1)/
Indoor heat exchanger temperature (Th2)
Th2<Th1+6
50 N
<
=
10 Th1 40
<
=< =
0 Th1 40
<
=< =
50 N
<
=
Note Except that the fan speed is Hi in heating operation.
min-1
21°C-38°C
0°C
2°C
(TH2)continuously
(TH1)
(TH1)
;TH2 0:1st speed0:2nd speed, TH2
(TH1)
(TH2)
3rd
2nd
1st
<
=
'22 • SRK-SM-349
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