Mitsubishi Electric SRK19CIS User manual

ROOM AIR-CONDITIONING
TECHNICAL MANUAL & PARTS LIST
WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
(Split system, air cooled cooling only type)
SRK19CIS, 25CIS

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TECHNICAL MANUAL

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CONTENTS
1 GENERAL INFORMATION............................................................................... 3
1.1 Specific features ....................................................................................... 3
1.2 How to read the model name ................................................................... 3
2 SELECTION DATA ........................................................................................... 4
2.1 Specifications............................................................................................ 4
2.2 Range of usage & limitations................................................................... 6
2.3 Exterior dimensions ................................................................................. 6
2.4 Piping system............................................................................................ 8
2.5 Selection chart .......................................................................................... 9
3 ELECTRICAL DATA ....................................................................................... 10
3.1 Electrical wiring ...................................................................................... 10
4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER .................. 12
4.1 Operation control function by remote control ..................................... 12
4.2 Unit ON/OFF button ................................................................................ 13
4.3 Power blackout auto restart function ................................................... 13
4.4 Custom cord switching procedure........................................................ 14
4.5 Flap and louver control .......................................................................... 14
4.6 TIMER operation ..................................................................................... 15
4.7 Outline of cooling operation .................................................................. 16
4.8 Outline of dry operation ......................................................................... 17
4.9 Outline of auto operation ....................................................................... 18
4.10 Outline of fan operation ......................................................................... 18
4.11 Regulation of outdoor air flow ............................................................... 19
4.12 Stop mode ............................................................................................... 19
4.13 External control (remote display)/control of input signal ................... 20
4.14 Operation permission/prohibition control ............................................ 21
4.15 Protective control function .................................................................... 21
4.16 List of indoor unit jumper selections .................................................... 24
5 APPLICATION DATA ...................................................................................... 25
5.1 Selection of location for installation ...................................................... 26
5.2 Installation of indoor unit ........................................................................ 27
5.3 Installation of outdoor unit ..................................................................... 30
5.4 Refrigerant piping .................................................................................... 30
5.5 Test run ..................................................................................................... 32
5.6
Precautions for wireless remote control installation and operation ........ 32
6 MAINTENANCE DATA ................................................................................... 33
6.1 Troubleshooting procedures for electrical equipment......................... 33
6.2 Servicing ................................................................................................... 41

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1.2 How to read the model name
Example : SR K 19 C IS
TIMER lightRUN light
Error of signal transmission
1 GENERAL INFORMATION
1.1 Specific features
The “MITSUBISHI HEAVY INDUSTRIES, LTD” room air-conditioner: SRK series are of split and wall mounted type and the unit
outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling
switch and the outdoor unit is composed of condensing unit with compressor.
(1) Remote control flap & louver
The flap & louver can be automatically controlled by operating wireless remote control.
Flap swing : The flaps swing up and down successively.
Louver swing : The louvers swing left and right successively.
Multi-directional Air Flow : Activating both up/down air swing and left/right air swing at the same time results in a multi-
directional air flow.
Memory flap : Once the flap & louver position is set, the unit memorizes the position and continues to operate
at the same position from the next time.
(2)Auto operation
When the remote control is set on “aut o ( ) ”, it will either automatically decide operation mode such as cooling and dry, or
operate in the operation mode before it has been turned to automatic control.
(3)Self diagnosis function
We are constantly trying to do better service to our customers by installing such judges that show abnormality of operation as
follows.
Room temperature sensor error
Indoor fan motor error
Heat exchanger sensor error
2 time flash
6 time flash
TIMER light
ON
Outdoor heat exchanger sensor
error
Discharge pipe temp. sensor error
Outdoor temperature sensor error
2 time flash
4 time flash
RUN light
keeps flashing
1 time flash
Abnormality of outdoor unit
Over heat of compressor
2 time flash
5 time flash
RUN light
ON
6 time flash
Series No.
Cooling only type
Product capacity
Wall mounted type
Split type room air-conditioner
(up/down air scroll and
left/right air scroll)
1 time flash
·
·
·
·
·
consists of indoor unit and
equipment with operation control

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Item
Model SRK19CIS SRC19CIS
Cooling capacity
(1)
W5200
Power source 1 Phase, 220V, 50Hz
Cooling input kW 1.49
Running current (Cooling) A 7.4
Inrush current A 33
COP Cooling: 3.49
Cooling Sound level Hi 45, Me 41, Lo 38 49
Noise level Power level dB 60 65
Exterior dimensions
Height Width Depth mm 318 1098 248 640 850
⳯
⳯
⳯⳯⳯
⳯⳯
⳯⳯
⳯
⳯⳯
290
Color Yellowish white Stucco white
Net weight kg 15 46
Refrigerant equipment
Compressor type & Q’ty –RH277VHST (Rotary type) 1
Motor kW –1.3
Starting method – Line starting
Heat exchanger Slit fins & inner grooved tubing Straight fin & inner grooved tubing
Refrigerant control Capillary tubes + Electric expansion valve
Refrigerant
(3)
kg R22 1.3 (Pre-Charged up to the piping length of 7m)
Refrigerant oil R0.52 (DIAMOND MS56)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan 1 Propeller fan 1
Motor W 46 43
Air flow (at High) (Cooling) CMM 20 38
Air filter, Q’ty Polypropylene net (washable) 2 –
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater – –
Operation control
Operation switch Wireless-Remote control –
Room temperature control Microcomputer thermostat –
Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)
Safety equipment
O.D mm (in) Liquid line: ø6.35 (1/4") Gas line: ø15.88 (5/8")
Connecting method Flare connecting
Attached length of piping Liquid line: 0.70m
Gas line: 0.63m –
–
Insulation Necessary (Both sides)
Drain hose Connectable
P
Recommended breaker size A 20
ower source supply Terminal block (Screw fixing type)
Size Core number 1.5 mm
2
4 cores (Including earth cable)
Connection wiring Connecting method Terminal block (Screw fixing type)
Accessories (included) Mounting kit, Clean filter (Natural enzyme filter ⳯ 1, Photocatalytic washable deodorizing filter ⳯ 1)
Optional parts
Notes (1) The data are measured at the following conditions.
2 SELECTION DATA
2.1 Specifications
Model SRK19CIS (Indoor unit)
SRC19CIS (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
(2) The operation data are applied to the 220V.
(3) The refrigerant quantity to be charged includes the refrigerant in 7 m connecting piping.
(Purging is not required even in the short piping.)
If the piping length is longer, when it is 7 to 25m, add 10g refrigerant per meter.
Operation data
(1) (2)
Refrigerant piping
Compressor: overheat protection, Frost protection, Serial signal error protection, Indoor fan motor error
protection
The piping length is 7.5m.
(220V)

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Item
Model SRK25CIS SRC25CIS
Cooling capacity(1) W7000
Power source 1 Phase, 220V, 50Hz
Cooling input kW 2.04
Running current (Cooling) A 10.2
Inrush current A 45
COP Cooling: 3.43
Noise level Cooling Sound level dB Hi 46, Me 42, Lo 39 52
Power level 60 67
Exterior dimensions
Height Width Depth mm 318 1098 248 750 880 340
Color Yellowish white Stucco white
Net weight kg 15 67
Refrigerant equipment
Compressor type & Q’ty –2JS386D5CA02 (Rotary type) 1
Motor kW –1.8
Starting method – Line starting
Heat exchanger Slit fins & inner grooved tubing Straight fin & inner grooved tubing
Refrigerant control Capillary tubes + Electric expansion valve
Refrigerant(3) kg R22 1.75 (Pre-charged up to the piping length of 7m)
Refrigerant oil R0.7 (ATMOS NM56M or SUNISO 4GDID)
Deice control Microcomputer control
Air handling equipment
Fan type & Q’ty Tangential fan 1 Propeller fan 1
Motor W 46 85
Air flow (at High) (Cooling) CMM 20.5 60
Air filter, Q’ty Polypropylene net (washable) 2 –
Shock & vibration absorber – Cushion rubber (for compressor)
Electric heater – –
Operation control
Operation switch Wireless-Remote control –
Room temperature control Microcomputer thermostat –
Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)
Safety equipment
O.D mm (in) Liquid line: ø6.35 (1/4") Gas line: ø15.88 (5/8")
Connecting method Flare connecting
Attached length of piping Liquid line: 0.70m
Gas line : 0.63m –
–
Insulation Necessary (Both sides)
Drain hose Connectable
Power source supply Terminal block (Screw fixing type)
Size Core number 1.5 mm24 cores (Including earth cable)
Connection wiring Connecting method Terminal block (Screw fixing type)
Accessories (included) Mounting kit, Clean filter (Natural enzyme filter ⳯ 1, Photocatalytic washable deodorizing filter ⳯ 1)
Optional parts
Notes (1) The data are measured at the following conditions.
Model SRK25CIS (Indoor unit)
SRC25CIS (Outdoor unit)
Item Indoor air temperature Outdoor air temperature Standards
Operation DB WB DB WB
Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612
(2) The operation data are applied to the 220V.
(3) The refrigerant quantity to be charged includes the refrigerant in 7 m connecting piping.
(Purging is not required even in the short piping.)
If the piping length is longer, when it is 7 to 25m, add 10g refrigerant per meter.
Operation data
(1) (2)
Refrigerant piping
Compressor: overheat protection, Frost protection, Serial signal error protection, Indoor fan motor error
protection
The piping length is 7.5m.
(220V)
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⳯⳯ ⳯⳯⳯
⳯
⳯
⳯
⳯
⳯
⳯
Recommended breaker size A 20

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2.2 Range of usage & limitations
2.3 Exterior dimensions
Indoor return air temperature
(Upper, lower limits)
Refrigerant line (one way) length
All models
Refer to the selection chart
Power source voltage Rating 10%
Voltage at starting Min. 85% of rating
Max. 25m
Max. 15m
Frequency of ON-OFF cycle Max. 10 times/h
ON and OFF interval Max. 3 minutes
Outdoor air temperature
(Upper, lower limits)
Vertical height difference between
outdoor unit and indoor unit
Item
Models
(1) Indoor unit
Models SRK19CIS, 25CIS
VIEW A
A
17.360
150
4
43.5
55
64
489
Piping hole right (left)
3
248
55
4
19 51.2
55
Terminal block
1090
Unit: mm
318
77
44.5
7.7
299
106
8.5301.8
25
50
Installation board
450
50
25
Piping for Gas (ø15.88) 633.5
44.5
53.5
106
49.5
349
886
221.547
Indoor unit
1098
Piping for Liquid (ø6.35) 703.5
Drain hose 772 (ø16)
Piping hole (ø65) Piping hole (ø65)
Ⳳ

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7
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Drain holes
286.4
12
50
290
49.6 43.5
850
203.1 510 136.9
476
Elogated hole
(2-12 x16)
314 12
328
Terminal block
Service valve (Liquid)
ø6.35 (1/4'')
Service valve (Gas)
ø15.88 (5/8'')
Ground
terminal
124 34.6
20˚
20˚
42.7
100.3
15
640
14
(2) Outdoor unit
Model SRC19CIS
Model SRC25CIS
Unit: mm
Terminal block
Service valve (Gas)
Flare fitting ø15.88 (5/8")
Service valve (Liquid)
Flare fitting ø6.35 (1/4")
25.1165.5
30˚
30˚
48.5103.3
750
24.1
Drain holes
2-ø15 25.8
29.8
87.9880
150580150
61
532
223
60
15
340
61 47.5
19 380 19
418
Unit: mm

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2.4 Piping system
Model SRK19CIS
Model SRK25CIS
Outdoor unitIndoor unit
Room temp.
sensor
Humidity
sensor
Heat
exchanger
Flare connecting
Heat
exchanger
sensor
Piping
(Liquid)
ø 6.35
Piping
(Gas)
ø15.88
Check joint
Service valve (Liquid)
Flare connecting
Discharge pipe
temp. sensor
Muffler
Outdoor air
temp. sensor
Heat
exchanger
Heat exchanger
sensor
Compressor
Capillary tube
Strainer
accumulator
Sub
Accumulator
Service valve
(Gas)
Electronic
expansion valve
Outdoor unitIndoor unit
Room temp.
sensor
Humidity
sensor
Heat
exchanger
Flare connecting
Heat
exchanger
sensor
Piping
(Liquid)
ø 6.35
Piping
(Gas)
Check joint
Service valve (Liquid)
Flare connecting
Discharge pipe
temp. sensor
Muffler
Outdoor air
temp. sensor
Heat
exchanger
Heat exchanger
sensor
Compressor
Capillary tube
Strainer Strainer
accumulator
Sub
Accumulator
Service valve
(Gas)
Electronic
expansion valve
ø
15.88

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2.5 Selection chart
Correct the cooling capacity in accordance with the conditions as follows. The net cooling capacity can be obtained in the following way.
Net capacity = Capacity shown on specification Correction factors as follows.
(1)Coefficient of cooling capacity in relation to temperatures
(2) Correction of cooling capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling capacity in relation to the one way piping length between the indoor and outdoor units.
14 16 18 20 22
15
20
25
30
35
40
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
43
24
ISO-T1 Standard ConditionIndoor air W.B. temperature ˚C W.B.
Cooling
Applicable range
Coefficient of cooling capacity in relation to temperature
Cooling operation
Outdoor air D.B.
temperature
˚C D.B.
Piping length [m]
Cooling
7
1.0
10
0.99
15
0.975
20
0.965
25
0.95
How to obtain the cooling capacity
Example : The net cooling capacity of the model SRK25CIS with the piping length of 15m, indoor wet-bulb temperature at 19.0˚C and
outdoor dry-bulb temperature 35˚C is Net cooling capacity = 7000 0.975 1.0 =6825 W
SRK25CIS Length 15m Factor by air
temperatures
⳯
⳯⳯

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3 ELECTRICAL D ATA 3.1 Electrical wiring
Model SRK19CIS
DS
+
~
-
~
JN L
CC
11
9
7
3
5
CNU
JEM-A
CNE CNF
CNM
CNX
CNY
CNT
Option
XR1
XR2
XR3
XR4
XR5
CNG
SM
LM1
LM2
HA
J
RD Y/G
G
Y/G
BK
2/N
1
WH
3
2/N
1
3
L
N
RD
Y/G
BK
R/LS/N
WH
WH
RD
BK
1
3
Y
BL
4
5
6
ZNR
ZNR
F
250V
3.15A
F
250V
3.15A
TB TB
BK
Color symbol
Meaning of marks
Symbol
CM
F
FM
I
FM O
SM
LM
1,2
Th 1
Th 2
Th 3
Compressor motor
Fuse
Fan motor(Indoor)
Fan motor(Outdoor)
Flap motor
Louver motor
Room temp.sensor
Heat exch.sensor(Indoor unit)
Humidity sensor
Terminal block
Operation indication (DC12)
Heating indication (DC12)
ON indication for CM(DC12)
Check indication (DC12)
Distant operation
Heat exch.sensor(Outdoor unit)
Outdoor air temp.sensor
Discharge pipe temp.sensor
Varistor
Electronic expansion valve
Diode stack
Auxiliary relay
Capacitor for CM
Capacitor for FM
O
Th 4
Th 5
Th 6
ZNR
EEV
DS
52
X1~4
CC
CF
O
TB
XR1
XR2
XR3
XR4
XR5
Parts name
BL
OR
Y/G
Black
Blue
Orange
Yellow/Green
WH White
RD Red
GR Green
Y Yellow
Parts name Parts name
Symbol Symbol
BK WH RD
WH
RD
WH
OR
Y
RD
BL
WH
BK
Y
Y
CM2
CM1
W
V
U
52X1
52X3
52X4
Heat
exchanger Power Source
1 Phase
220V 50Hz
R-AMP
Wireless
Display
Printed circuit
board
Printed circuit
board
CNU
CNE
CNG
FM I
CM
52X 1 52X 3 52X 4
EEV
FMo
CF O
Th4
Th5
Th6
Outdoor unit
Indoor unit
Th3
Th2Th1

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Model SRK25CIS
DS
+-
JN L
CC
11
9
7
3
1
5
Option
XR1
XR2
XR3
XR4
XR5
CNE CNF
CNM
CNX
CNY
CNT
CNG
SM
LM1
LM2
Heat
HA
J
RD Y/G
G
Y/G
BK
2/N
1
WH
3
2/N
1
3
L
N
RD
Y/G
BK
R/LS/N
WH
WH
RD
BK
1
3
Y
BL
4
5
6
exchanger
ZNR
ZNR
F
250V
3.15A
F
250V
3.15A
TB TB
BK
Color symbol
Meaning of marks
Symbol
CM
F
FM
I
FM O
SM
LM
1,2
Th 1
Th 2
Compressor motor
Fuse
Fan motor(Indoor)
Fan motor(Outdoor)
Flap motor
Louver motor
Room temp.sensor
Heat exch.sensor(Indoor unit)
Capacitor for CM
Capacitor for FM
O
Terminal block
Operation indication (DC12)
Heating indication (DC12)
ON indication for CM(DC12)
Check indication (DC12)
Distant operation
Humidity sensor
Heat exch.sensor(Outdoor unit)
Outdoor air temp.sensor
Discharge pipe temp.sensor
Varistor
Electronic expansion valve
Diode stack
Auxiliary relay
Th
3
Th 4
Th 5
Th 6
ZNR
EEV
DS
52
X1~5
CC
CF
O
TB
XR1
XR2
XR3
XR4
XR5
Parts name
BL
OR
Y/G
Black
Blue
Orange
Yellow/Green
WH White
RD Red
GR Green
YYellow
Parts name Parts name Symbol Symbol
BK WH RD
WH
RD
WH
OR
Y
RD
BL
BK
WH
BK
Y
Y
CM2
CM1
W
V
U
52X1
52X3
52X4
52X5
Power Source
1 Phase
220V 50Hz
R-AMP
Wireless
Display
board
Printed circuit
Printed circuit
board
CNU
JEM-A
CNU
CNE
CNG
FM I
CM
EEV
FMo
CF O
52X 1 52X 3 52X 4
52X 5
Th4
Th5
Th6
Outdoor unit
Indoor unit
Th3Th2
Th1
~~

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12
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FAN SPEED button
Each time the button is pushed, the indi-
cator is switched over in turn.
•The above illustration shows all controls, but in practice
only the relevant parts are shown.
OPERATION MODE select button
Each time the button is pushed, the indi-
cator is switched over in turn.
ON/OFF (luminous) button
Press for starting operation, press again for
stopping.
HI POWER/ECONO button
This button changes the HIGH POWER/
ECONOMY mode.
AIR FLOW (UP/DOWN) button
This button changes the air flow (up/down)
mode.
This button changes the air flow (left/right)
mode.
SLEEP button
This button selects SLEEP operation.
CLEAN switch
ON TIMER button
This switch changes the CLEAN mode.
This button selects ON TIMER operation.
AIR FLOW (LEFT/RIGHT) button
This button cancels the ON TIMER,
OFF TIMER, and SLEEP operation.
CANCEL button
RESET switch
TIME SET UP switch
Switch for resetting microcomputer.
This switch for setting the time.
SLEEP indicator
Indication section
◆
Operation section
Models All models
Remote control
◆
Indicates during SLEEP operation.
TEMPERATURE indicator
Indicates set temperature.
(Does not indicate temperature when operation
mode is on AUTO)
Indicates set air flow rate with lamp.
Indicates during CLEAN operation.
ON/OFF TIMER indicator
Indicates during ON/OFF TIMER operation.
AIR FLOW indicator
Shows selected flap and louver mode.
HI POWER/ ECONO MODE indicator
Indicates during HIGH POWER/ECONOMY
mode operation.
[
OPERATION MODE indicator
Indicates selected operation with lamp.
(Auto) • (Cool) • (Fan) • (Dry)]
OFF TIMER button
This button selects OFF TIMER operation.
TEMPERATURE button
This button sets the room temperature.
(This button changes the present time and
TIMER time.)
TIME indicator
Indicates present time or TIMER setting time.
FAN SPEED indicator
CLEAN indicator
4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
4.1 Operation control function by remote control

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Models All models
RUN light (green)
• Illuminates during operation.
• Blinks at the ‘CLEAN operation’.
TIMER light (yellow)
Illuminates during TIMER operation.
HI POWER light (green)
Illuminates during HIGH POWER operation.
ECONO light (orange)
Illuminates during ECONOMY operation.
4.2 Unit ON/OFF button
When the remote control batteries become weak, or if the remote control is lost or malfunctioning, this button may be used to turn the
unit on and off.
(1) Operation
Push the button once to place the unit in the auto mode. Push it once more to turn the unit off.
(2) Details of operation
The unit will go into the auto mode in which it automatically determines, from room temperature (as detected by sensor),
whether to go into the cooling or dry modes.
Function Room temperature
Operation mode
setting Fan speed Flap
TIMER switch
Cooling About 24ºC
Dry About 24ºC
Auto Auto Continuous
4.3 Power blackout auto restart function
(1)Power blackout auto restart function is a function that records the operational status of the air-conditioner immediately prior to it
being switched off by a power cut, and then automatically resumes operations at that point after the power has been restored.
(2)The following settings will be cancelled:
(a)TIMER settings
(b) HIGH POWER operations
Notes (1) The power blackout auto restart function is set at on when the air-conditioner is shipped from the
factory. Consult with your dealer if this function needs to be switched off.
(2) When power failure ocurrs, the TIMER setting is cancelled. Once power is resumed, reset the TIMER.
(3)
If the jumper wire (J7) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram at right)
Unit ON/OFF button
Jumper wire (J7)
EXTERNAL INPUT
WIRED REMOCON
OPE PERMISSION
CUSTOM
AUTO RESTART
LO TEMP
DIRT PREVENT
COOL ONLY
HI CEIL
PANEL
50/60
Unit indication section
CLEAN operation
ON
3 sec.
1 sec.
OFF

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14
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4.4 Custom cord switching procedure
If two wireless remote controls are installed in one room, in order to prevent wrong
operation due to mixed signals, please modify the printed circuit board in the indoor
unit’s control box and the remote control using the following procedure. Be sure to modify
both boards. If only one board is modified, receiving (and operation) cannot be done.
(1) Modifying the indoor unit’s printed circuit board
Take out the printed circuit board from the control box and cut off jumper wire (J4) using
wire cutters.
After cutting of the jumper wire, take measures to prevent contact with the other the
lead wires, etc.
(2) Modifying the wireless remote control
(a) Remove the battery.
(b) Cut the jumper wire shown in the figure at right.
4.5 Flap and louver control
Control the flap and louver by AIRFLOW (UP/DOWN) and (LEFT/RIGHT) button on the wireless remote control.
(1) Swing flap
Flap moves in upward and downward directions continuously.
(2) Swing louver
Louver moves in left and right directions continuously.
(3) When not operating
The flap returns to the position of air flow directly below, when operation has stopped.
(4) Multi-directional Air Flow (up/down air scroll and left/right air scroll)
Activating both up/down air swing and left/right air swing at the same time results in a multi-directional air flow.
Up/down air scroll
In COOL, DRY and FAN operation
(5) Memory flap (Flap or Louver stopped)
When you press the AIRFLOW (UP/DOWN or LEFT/RIGHT) button once while the flap or louver is operating, it stops swinging
at an angle. Since this angle is memorized in the microcomputer, the flap or louver will automatically be set at this angle when the
next operation is started.
Recommendable stopping angle of the flap
Horizontal
blowing
COOL•DRY
Left/right air scroll
In COOL, DRY and FAN operation
Left louver Right louver
EXTERNAL INPUT
WIRED REMOCON
OPE PERMISSION
CUSTOM
AUTO RESTART
LO TEMP
DIRT PREVENT
COOL ONLY
HI CEIL
PANEL
50/60
Jumper wire (J4)
Stops at this position
for 5 seconds.
Thick line : moves quickly
Thin line : moves slowly
▲
▲
▲
▲
·
Jumper wire (J6)
Cut

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15
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(1)Comfortable TIMER setting (ON TIMER)
If the TIMER is set at ON when the operation select switch is set at the cooling, or the cooling 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 room temperature at the setting time (temperature of room temperature sensor) and the setting temperature. (Max. 60
minutes)
Operation mode Operation start time correction value (Min.)
3 < Room temp. – Setting temp. 1 < Room temp. – Setting temp. 3 Room temp. – Setting temp. 1
At cooling
+5 No change –5
Notes (1) At 5 minutes before the ON TIMER time, operation starts regardless of the temperature of the room temperature sensor (Th1).
(2) This function does not actuate when the operation select switch is set at the dry as well as the dry in the auto mode.
However, the operation of item (1) above is performed during the dry in the auto mode.
(3) During the comfortable TIMER operation, both the RUN light and TIMER light illuminate and the TIMER light goes off after expiration of the TIMER, ON setting
time.
If the difference (= Room temperature – Setting tempera-
ture) is 4ºC, the correction value is found to be +5 min-
utes from the table shown above so that the starting time
of next operation is determined as follows:
15 min. earlier + 5 min. = 20 min. earlier
Current operation Correction value
start time
(Example) Cooling
Room temperature
Setting temperature
Start
TIMER operation
(time)
Temperature
setting (˚C)
SLEEP operation
4.6 TIMER operation
Pressing the SLEEP button causes the temperature to be controlled as shown in the following chart with respect to the set temperature.
+1.0
0
-1.0
01.0 2.0
(2)
Operation starting time
Time
Cooling
Corrects the starting time of next operation by
calculating the temperature difference.
·
Setting time
15 min. 10 min. 5 min.
earlier earlier earlier
(3) OFF TIMER operation
The OFF TIMER can be set at a specific time (in 10-minute units) within a 24-hour period.

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4.7 Outline of cooling operation
(1) Operation of major functional components
(2) Fan speed switching
(a) Auto fan control
The indoor fan is automatically controlled in accordance with the difference between the room temperature (detected by the
room temperature sensor) and the termostat setting as shown below.
Indoor fan motor
Flap and louver
Display
Outdoor fan motor
Electric expansion valve
ON
ON or OFF
Lights up
Depending on the stop mode
ON
ON or OFF
Lights up
ON
Depending on the EEV control
OFF
Stop position control
Lights up or flashes
Depending on the stop mode
When the compressor
command is OFF
When the compressor
command is ON
When the compressor goes
OFF due to an anomalous stop.
Functional
components
Item
Air scroll
Swing flap or louver
Swing stop
Auto fan control
Speed 8
Speed 8
Speed 8
Speed 6
Speed 6
Speed 6
AUTO HIGH MED
Speed 4
Speed 4
Speed 4
LOW
Flow control
Fan speed switching
Speed 6
Speed 4
Thermostat setting point
Speed 8
+1 +2 +3 +4
(3) Thermostat operation
The compressor and outdoor fan and turned on and off as shown below according to the temperature setting.
(4) HIGH POWER operation ( “HI POWER” button on the remote control : ON)
The following operation is performed for 15 minutes without relation to the set temperature or fan speed setting.
(5) ECONOMY operation ( “ECONO” button on the remote control : ON)
The set temperature changes as shown at right, and the
indoor unit fan speed is set on speed 4.
Notes (1) Room temperature is not adjusted during the HIGH POWER operation.
(2) Protective functions will actuate with priority even during the HIGH POWER
operation.
OFF
ON
Set temp.
-1
Room temp.
Compressor
Outdoor fan
Indoor unit fan
Outdoor unit fan
Compressor
Speed 9 fixed
ON
ON
Running time
Running start ~ 1 hour
1~2 hours
2 hours ~
Set temperature compensation
Set temperature +0.5
Set temperature +1.0
Set temperature +1.5

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D block C block B bloc k A block
4.8 Outline of dry operation
(1) Choose the appropriate operation block area by the difference between room temperature and thermostat setting temperature as
shown below.
Operation block area
–2 0 +3
Room temp. – Setting temp.(deg)
(2) Start up operation
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Speed 4
369120
Speed 1
20
seconds
minutes
C.D block
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Speed 4
120 minutes
A.B block
Operation block decision
Note (1) Thermostat operation is performed in A, B block. When compressor and indoor fan stop by thermostat operation within 12 minutes from start, temperature
check is performed by operating indoor fan at speed 1 for 20 seconds before finishing 12 minutes and allowing decision of next operation block.
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Speed 4
480
Speed 1
20
seconds
minutes
B block
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Speed 4
80 minutes
A block
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
480
Speed 1
20
seconds
minutes
20
seconds
D block
Compressor
and
outdoor fan
ON
OFF
OFF
Indoor fan
Start Temperature check
Speed 4
Speed 1
830 minutes
C block
Operation block decision
Operation block decision
(3) Dry operation
After finishing start up operation described in (2) above, dry operation is performed at 8 minutes intervals, according to the
difference between room temperature and thermostat setting temperature as shown below.
Beside, 1 cycle of this operating time consists of 8 minutes, 7 cycle operation is performed then.
Running time
Running start ~ 1 hour
1~2 hours
2 hours ~
Set temperature compensation
Set temperature +0.5
Set temperature +1.0
Set temperature +1.5
(4) ECONOMY operation ( “ECONO” button on the remote control : ON)
The set temperature changes as shown at right, and the
indoor unit fan speed is set on speed 4 .
·

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4.9 Outline of auto operation
(1) Determination of operation mode
The unit checks the room temperature and the outdoor air temperature after operating the indoor and outdoor blowers for 20
seconds, determines the operation mode and the room temperature setting correction value, and then begins in the auto
operation.
(2) Within 30 minutes after either auto or manual operation stops, if auto operation is started, or if you switch to auto operation during
manual operation, the system runs in the previous operation mode.
(3) The temperature is checked 1 time in 30 minutes after the start of operation, and if the judgment differs from the previous operation
mode, the operation mode changes.
(4) 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.
Signals of wireless remote control (Display)
–6 –5 –4 –3 –2 –1 0 +1 +2 +3 +4 +5 +6
Setting Cooling 18 19 20 21 22 23 24 25 26 27 28 29 30
temperature Dry 18 19 20 21 22 23 24 25 26 27 28 29 30
4.10 Outline of fan operation
(1) Operation of major functional components
(2) HIGH POWER operation (“HI POWER” button on the remote control : ON)
The following operation is performed for 15 minutes without relation to the set temperature or fan speed setting.
52C
Indoor fan motor
Outdoor fan motor
Flap and louver
Speed 9 Speed 8 Speed 8
OFF
OFF
Depend on the flap and louver control
Speed 6 Speed 4 Speed 2
HIGH POWER AUTO HIGH MED LOW ECONO
Functional
components
Fan speed switching
Indoor unit fan
Outdoor unit fan
Compressor
Speed 9 fixed
OFF
OFF
Note (1) Protective functions will actuate with priority even during the HIGH POWER operation.
27.5
25.5
19.5
18 30
Room temperature (˚C)
Cooling
Dry
Outdoor temperature (˚C)
+
–

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4.11 Regulation of outdoor air flow
The fan operates as follows according to the outdoor air temperature.
SRK19CIS
Cooling, dry
Outdoor air temp. (˚C)
32
2nd speed
1st speed
30
Functional
components
Compressor
EEV
control
Fully closed
OFF
OFF
Set location
ON
OFF
ON
ON
Outdoor unit fun
Indoor unit fun
Flap
EEV
Cooling, cooling oriented dry Cooling, cooling oriented dry
Operation
Stop instructions All stop Stop instructions Restart
When the complete stop command given, when
there is and abnormal stoppage command
When stoppage occurs due to thermostat operation,
switching operations and protective function operations
470 pulse
150 pulse
1 min.
1 min.
3 min.
2 min.55 sec.
2 min.55 sec.
470 pulse
4.12 Stop mode
SRK25CGS
Cooling, dry
Outdoor air temp. (˚C)
25
2nd speed
1st speed
23
3rd speed
3230
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