Mitsubishi Electric SRK19CIS, SRK25CIS Technical 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)

W 5200

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

R

0.52 (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

Wir eless-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 mm2 4 cores (Including earth cable)

Connection wiring

Connecting method Terminal block (Screw fixing type)

Accessories (included)

Mounting kit, Clean filter (Natural enzyme filter⳯1, Photocatalytic washable deodorizing filter⳯1)

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)

W 7000

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

R

0.7 (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 mm2 4 cores (Including earth cable)

Connection wiring

Connecting method Terminal block (Screw fixing type)

Accessories (included)

Mounting kit, Clean filter (Natural enzyme filter⳯1, Photocatalytic washable deodorizing filter⳯1)

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)

⳯

⳯⳯

⳯⳯⳯

⳯

⳯

⳯

⳯

⳯

⳯

Recommended breaker size A 20

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6

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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

-

7

-

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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8

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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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10

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3 ELECTRICAL D ATA

3.1 Electrical wiring

Model SRK19CIS

DS

+~-

~

J

N 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

52X152X352X

4

EEV

FMo

CF

O

Th4

Th5

Th6

Outdoor unit

Indoor unit

Th3

Th2Th1

-

11

-

Model SRK25CIS

DS

+-

J

N 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

Y

Yellow

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

52X152X352X

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 indi­cator 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 indi­cator 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

-

13

-

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

-

14

-

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 tempera­ture) is 4ºC, the correction value is found to be +5 min­utes 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

0 1.0 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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16

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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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17

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D block C block B block 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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18

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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)

+
–

-

19

-

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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