Mitsubishi SRK25ZSP-W, SRK35ZSP-W, SRK45ZSP-W Service Manual

Manual No.'18 • SRK-SM-259

SERVICE MANUAL

INVERTER WALL MOUNTED TYPE
RESIDENTIAL AIR-CONDITIONERS

(Split system, air to air heat pump type)

SRK25ZSP-W
SRK35ZSP-W
SRK45ZSP-W

'18 • SRK-SM-259

CONTENTS

1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ................... 2

(1) Operation control function by wireless remote control

(2) Unit ON/OFF button

................................................................................. 3

............................. 2

................................................................................. 3(3) Auto restart function

(4) Installing two air-conditioners in the same room

...................................... 3

(5) High power operation ............................................................................... 4

(6) Economy operation

.................................................................................. 4

(7) Air flow direction adjustment .................................................................... 4

(8) Timer operation

........................................................................................ 5

(9) Outline of heating operation ..................................................................... 5

(10) Outline of cooling operation ..................................................................... 7

(11) Outline of automatic operation ................................................................. 7

(12) Protection control function

2. MAINTENANCE DATA

(1) Cautions

................................................................................................. 16

................................................................................. 16

....................................................................... 8

(2) Items to check before troubleshooting ................................................... 16

(3) Troubleshooting procedure

(If the air-conditioner does not run at all)

........ 16

(4) Troubleshooting procedure (If the air-conditioner runs)

......................... 17

(5) Self-diagnosis table ............................................................................... 18

(6) Service mode (Trouble mode access function) ..................................... 19

(7) Inspection procedures corresponding to detail of trouble ...................... 27

(8)

Phenomenon observed after short-circuit, wire breakage on sensor

(9) Checking the indoor electrical equipment

.............................................. 32

.......... 31

(10) How to make sure of wireless remote control ........................................ 33

(11) Outdoor unit inspection points ............................................................... 34

3. ELECTRICAL WIRING

(1) Indoor units

........................................................................................... 37

................................................................................. 37

(2) Outdoor units ........................................................................................ 38

4. PIPING SYSTEM

.......................................................................................... 40

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'18 • SRK-SM-259

1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

(1) Operation control function by wireless remote control

Remote control

Operation section

◆

FAN SPEED button

Each time the button is pressed, the fan
speed changes.

HI POWER/ECONO button

This button changes the HIGH POWER/
ECONOMY mode.

ON TIMER button

This button selects ON TIMER operation.

SLEEP button

This button selects SLEEP operation.

CLEAN switch

This switch selects the SELF CLEAN
mode.

CANCEL button

This button cancels the ON timer, OFF
timer, and SLEEP operation.

The above illustration shows all controls, but in

•

practice only the relevant parts are shown.

OPERATION MODE select button

Each time the button is pressed, the
mode changes.

ON/OFF (luminous) button

Press to start operation, press again to
stop.

AIR FLOW (UP/DOWN) button

This button changes the air flow
(up/down) direction.

TEMPERATURE button

These buttons set the room temperature.
(These buttons are used for setting the
current time and timer function as well.)

OFF TIMER button

This button selects OFF TIMER
operation.

ACL switch

This switch resets the program to default
state.

Unit display section

Unit ON/OFF button

This button can be used for turning on/off
the unit when a remote control is not available.

Wireless remote control signal receiver

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)

TIMER light (yellow)

Ⅰlluminates during TIMER operation.

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'18 • SRK-SM-259

Cut

(2) Unit ON/OFF button

When the wireless remote control batteries become weak, or if the wireless remote control is lost or malfunctioning, this

button may be used to turn the unit on and off.

(a) Operation

Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off.

(b) Details of operation

The unit will go into the automatic mode in which it automatically determines, from room temperature (as detected by

sensor), whether to go into the COOL, DRY or Heat modes.

Operation mode

COOL

DRY

HEAT

Function

Room temperature

setting

About 24ºC

About 24ºC

About 26ºC

Fan

speed

Flap

Auto Auto

Timer

switch

Continuous

Unit ON/OFF button

(3) Auto restart function

(a)

Auto restart function records the operational status of the air-conditioner immediately prior to be switched off by a

power cut, and then automatically resumes operations after the power has been restored.

(b) The following settings will be cancelled:

(i) Timer settings

(ii) HIGH POWER operation

Jumper wire (J1)

Notes (1) 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.

If the jumper wire (J1) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram at right.)

(3)

(4) Installing two air-conditioners in the same room

When two air-conditioners are installed in the room, set the wireless

remote contrrol and indoor unit as belows to prevent operating air-condi-

tioners with one wireless remote control.

(a) Setting an indoor unit’s printed circuit board

Jumper wire (J2)

(i) Take out the printed circuit board from the control box.

(ii) Disconnect jumper wire (J2) with wire cutters.

(iii) Install a printed circuit board.

(b) Setting a wireless remote control

(i) Pull out the cover and take out batteries.

(ii) Disconnect the switching line next to the battery with wire cutters.

(iii) Insert batteries. Close the cover.

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'18 • SRK-SM-259

(5) High power operation

(6) Economy operation

Pressing the HI POWER/ECONO button intensifies the operating power and initiates powerful cooling and heating operation for

15 minutes continuously. The wireless remote control displays 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 hea-

ting, press the HI POWER/ECONO button again to cancel the HIGH POWER operation.

(b) HIGH POWER operation is not available during the DRY and the 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 canceled.
① When the HI POWER/ECONO button is pressed again.
② When the operation mode is changed.
③ When it has been 15 minutes since HIGH POWER operation has started.

(e) Not operable while the air-conditioner is OFF.

Pressing the HI POWER/ECONO button initiates a soft operation with the power suppressed in order to avoid an excessive
cooling or heating. The unit operates 1.5℃ higher than the setting temperature during cooling or 2.5℃ lower than that during

heating. The wireless remote control displays ECONO mark and the FAN SPEED display disappears.

(a) It will go into ECONOMY operation at the next time the air-conditioner runs in the following cases.
① When the air-conditioner is stopped by ON/OFF button during ECONOMY operation.
② When the air-conditioner is stopped in SLEEP or OFF TIMER operation during ECONOMY operation.
③ When the operation is retrieved from CLEAN operation.

(b) When the following operation are set, ECONOMY operation will be canceled.
① When the HI POWER/ECONO button is pressed again.
② When the operation mode is changed DRY to FAN.

(c) Not operable while the air-conditioner is OFF.

(d) The setting temperature is adjusted according to the following table.

① at the start of operation.
② one hour after the start of operation.
③ two hours after the start of operation.

(7) Air flow direction adjustment

Air ow direction can be adjusted with by AIR FLOW

(a) Flap

Item

Temperature
adjustment

Each time when you press the AIR FLOW

Angle of flap from horizontal

Remote control
display

COOL, DRY, FAN

HEAT

Mode

(Flap stopped)

Cooling Heating

①＋0.5
②＋1.0 ②－2.0
③＋1.5 ③－2.5

Approx. 15°

Approx. 25°

①－1.0

Approx. 25°

Approx. 35°



(UP/DOWN) button on the wireless remote control.





(UP/DOWN) button the mode changes as follows.



Approx. 35°

Approx. 50°

Approx. 45°

Approx. 59°

Approx. 59°

Approx. 65°

(Swing)

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'18 • SRK-SM-259

◆ In HEAT operation ◆ In COOL, DRY, FAN operation

Approx. 65°

ON OFF OFF

ON ON OFF

ON

OFF

(few minutes ON)

OFF

ON ON(HOT KEEP) OFF

OFF

OFF

(3 minutes ON)

OFF

OFF

Thermostat ON Thermostat OFF Defrost Failure

Heating

Compressor

Indoor fan motor

Outdoor fan motor

4-way valve

20-115rps 20-100rps

20

-

115rps 20-100rps

20

-

72rps 20-84rps 20-90rps

20

-

54rps 20-62rps 20-58rps

Model

Fan speed

SRK25ZSP-W SRK35ZSP-W SRK45ZSP-W

AUTO

MED

HI

LO

(b) Swing

Flap moves in upward and downward directions continuously.

Approx.

20°

Approx. 35°

Approx. 59°

(c) Memory flap

When you press the AIR FLOW (UP/DOWN) button once while the ap is operating, it stops swinging at the position.

Since this angle is memorized in the microcomputer, the ap will automatically be set at this angle when the next opera-

tion is started.

(d) When not operating

The ap returns to the position of air ow directly below, when operation has stopped.

(8) Timer operation

(a) Comfortable timer setting (ON timer)

If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in

auto mode operation is selected, the comfortable timer starts and determines the starting time of next operation based

on the initial value of 15 minutes and the relationship between the room temperature at the setting time (temperature of

room temperature sensor) and the setting temperature.

(b) Sleep timer operation

Pressing the SLEEP button causes the temperature to be controlled with respect to the set temperature.

(c) OFF timer operation

The Off timer can be set at a specic time (in 10-minute units) within a 24-hour period.

(9) 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

Deviation between the room temperature setting correction temperature and the suction air temperature is calculated in
accordance with the fuzzy rule, and used for control of the air capacity and the compressor speed.

When the defrost operation, protection device, etc. is actuated, operation is performed in the corresponding mode.

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(ii) Hot keep operation

Outdoor heat exchanger temperature (

TH1

-20

-25

-20 -15 -10 -5 0 5 10

-15

-10

-5

0

Outdoor air temperature (℃)

TH2

Outdoor heat exchanger temperature (℃)

Defrost operation
start

Defrost operation start temperature

Model DXK15Z6-S

1) Fuzzy operation

2) 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

(i)

1)

2)

3)

4)

−

≧

−

≦ ＜

30~115rps

30~115rps

30~76rps

30~46rps

SRK35ZJ-S

23~106rps

23~106rps

23~78rps

23~50rps

SRK50ZJ-S

30~115rps

30~115rps

30~72rps

30~42rps

SRK25ZJ-S

30~115rps

30~115rps

30~66rps

30~40rps

SRK20ZJ-S

Model

Fan speed

Auto

MED

HI

LO

(model DXK12 : 45)

35

35

(model DXK12 : 45)

(model DXK15 : ≧ −2 ࠉ) (model DXK15 : 10 ࠉ)

(model DXK15 : ≧

−2

ࠉ)

5)

＜

− −

−

−

1) 2) 3) 5)

(model DXK15 : ＋10 ࠉ)

higher

met.



(model SRK50 : 35)

(model SRK50 : 35)

'09•SRK-DB-087D

(16)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)

−

Model

Fan speed

Auto

MED

HI

LO

ULO

*It can be set the indoor fan motor off or the heating thermostat OFF with connecting a wired remote control.

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)

20~115rps

20~115rps

20~86rps

20~70rps

20~44rps

SRK20ZS-S

20~115rps

20~115rps

20~104rps

20~84rps

20~54rps

SRK25ZS-S

20~115rps

20~115rps

20~108rps

20~96rps

20~60rps

SRK35ZS-S

23~106rps

23~106rps

23~82rps

23~70rps

23~37rps

SRK50ZS-S

is as following.

During the heating operation, the indoor fan speed can be controlled based on the temperature of the indoor heat ex-

changer (Th2) to prevent blowing of cold air.

(c) Defrost operation

(i)

1)

(model SRK35 : 45)

35

2)

35

(model SRK35 : 45)

3)

－

4)

follows.

TH2

•0

•

•TH2

TH2: TH2

℃≦

℃≦

15

－

＜

0

＜

TH2

: TH2

℃

15

－

－

℃

TH1

≧

: TH2

TH1

－

7

－

≧

Models SRK25, 35, 45ZSP-W

(ii)

1)

2)

0

℃)

-5

-10

TH1

-15

-20

-25

In case satisfied all of following conditions.

-20 -15 -10 -5 0 5 10

• Connect compressor speed 0 rps 10 times or more.

• Satisfy 1), 2) and 3) conditions above.

• Outdoor air temperature is 3°C or less.

Defrost operation start temperature

Outdoor air temperature (℃)

and 30 seconds).

●

Defrost operation

Heating operation

Depends on an operation condition, the time can be longer than 7 minutes.

≦

, TH1

℃

2/15

≧

TH1

, TH1

℃

5

－

Defrost operation
start

TH2

operation

(Mode SRK45: Max.17 minutes and 30 seconds)

Total

Total

or less

℃

7

－

13/15

≦

, TH1

℃

7

＋

TH2

×

℃

5

＋

TH2

≦

Max. 16 minutes and 50 seconds

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'18 • SRK-SM-259

satisfied.

℃

7

－

TH2

×

satisfied.

(SRK45 : 10 )

16

minutes and 50 seconds (model SRK45 : 17 minutes



2-7 minutes

Hot keep operation

is as

27.5

25.5

18.0

18

30

(10) Outline of cooling operation

ON OFF OFF

OFF OFF OFF

ON

OFF

(few minutes ON)

OFF

(few minutes ON)

ON ON ON

Thermostat ON Thermostat OFF Failure

Cooling

Compressor

Indoor fan motor

Outdoor fan motor

4-way valve

15-74rps 20-97rps

15-74rps

15-98rps

15-98rps 20-97rps

15-52rps 15-74rps 20-72rps

15-38rps 15-46rps 20-44rps

Model

Fan speed

SRK25ZSP-W SRK35ZSP-W SRK45ZSP-W

AUTO

MED

HI

LO

(a) Operation of major functional components in cooling mode

(b) Detail of control in each mode (Pattern)

(i) Fuzzy operation

During the fuzzy operation, the air ow and the compressor speed are controlled by calculating the difference between

the room temperature setting correction temperature and the suction air temperature.

'18 • SRK-SM-259

(11) Outline of automatic operation

(a) Determination of operation mode

The unit checks the indoor air temperature and the outdoor air temperature, determines the operation mode, and then

begins in the automatic operation.

Cooling

Indoor air temperature (˚C)

A

Heating

Outdoor air temperature (˚C)

Dehumidifying

(b) The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the pre-

vious operation mode, changes the operation mode.

(i) If the setting temperature is changed with the remote control, the operation mode is judged immediately.

(ii) 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.

(iii) When the operation mode has been judged following the change of setting temperature with the remote control, the hour-

ly judgment of operation mode is cancelled.

(c) When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is

selected during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.

(d) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the

signals of the wireless remote control and the setting temperature.

Signals of wireless remote control (Display)

Setting
temperature

Cooling

Dehumidifying

Heating

–6 –5 –4 –3 –2 –1

18 19 20 21 22 23 24 25 26 27 28 29 30

19 20 21 22 23 24 25 26 27 28 29 30 31

20 21 22 23 24 25 26 27 28 29 30 31 32

0 +1 +2 +3 +4 +5 +6

±

(e) When the unit is operated automatically with the wired remote control connected, the cooling operation is controlled ac-

cording to the display temperatures while the setting temperature is compensated by ＋1˚C during dehumidifying or by

2˚C during heating.

＋

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7

(12) Protection control function

(a) Dew prevention control Ⅰ [Cooling]

Prevents dewing on the indoor unit.

(i) Operating conditions

When the following conditions have been satised.

1) Humidity is 78% or higher.

(ii) Contents of operation

Maximum compressor speed
SRK25ZSP-W

SRK35ZSP-W

SRK45ZSP-W

68 rps

73 rps

87 rps

(iii) Reset condition

When either of the following condition is satised.

1) Humidity is 73% or less.

2) Dew prevention control Ⅱ has been satised.

(b) Dew prevention control Ⅱ [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 speed is 32 rps or higher. (SRK25, 35)

2) Humidity is 68% or higher. (SRK45 : 60%)

(ii) Contents of operation

1) Air capacity control

'18 • SRK-SM-259

Model

Item

Upper limit of compressor speed

LO

SRK25,35ZSP-W SRK45ZSP-W

RangeA: 41rps, RangeB: 41rps RangeA: 57rps, RangeB: 39rps

Indoor fan 4th speed (SRK35 : 5th speed)

AUTO,HI,MED

Upper limit of compressor speed

Indoor fan

RangeA: 41rps, RangeB: 41rps RangeA: 57rps, RangeB: 39rps

Adaptable to compressor

speed (Lower limit 4th speed)

Note (1) Ranges A and B are as shown below.

Range B

Range A

68

73

Humidity(%)

2) When this control has continued for more than 30 minutes continuously,the following wind direction control is per-

formed.

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 po-

sition.

(iii) Reset condition

When any of followings is satised.

1) Humidity is less than 63%. (SRK45 : 55%)

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8

'09•SRK-DB-087D

(c) Frost prevention control

A

B

C

Outdoor heat exchanger temperature(°C)

8rps

(1)

8rps

(1)

0rps

After lapse of 20 sec. or over

(3)

After lapse of 20 sec. or over

(3)

After lapse of 20 sec. or over

(3)

(Example) Fuzzy

(i) Operating conditions

1)

2)

(ii) Detail of anti-frost operation

Indoor heat exchanger

Item

Lower limit of compressor speed

Indoor fan

Outdoor fan

4-way valve

temperature

(iii) Reset conditions

1)

2)

5°C or lower 2.5°C or lower

22rps (SRK45 : 23 rps)

compressor

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'18 • SRK-SM-259

compressor

speed

Lower

limit

speed

0 rps

2.55 8

Indoor heat exchanger

temperature (ºC)

(d) Cooling overload protective control

(i) Operating conditions

When the outdoor air temperature (TH2) has become continuously for 30 seconds at 41ºC or more, or 47ºC or more

with the compressor running, the lower limit speed of compressor is brought up.

Model

Item

Outdoor air temperature

Lower limit speed

SRK25, 35ZSP-W SRK45ZSP-W

41°C or more 47°C or more 41°C or more 47°C or more

30 rps 45 rps 27 rps 35 rps

(ii) Detail of operation

1) The outdoor fan is stepped up by 3 speed step. (Upper limit; 8th speed.)

2) The lower limit of compressor speed is set to 30 or 45(model SRK45 : 27 or 35) rps. However, when the thermo

OFF, the speed is reduced to 0 rps.

(iii) Reset conditions

When either of the following condition is satised.

1) The outdoor air temperature is lower than 40ºC.

2) The compressor speed is 0 rps.

(e) Cooling high pressure control

(i) Purpose

Prevents anomalous high pressure operation during cooling.

(ii) Detector

Outdoor heat exchanger sensor (TH1)

(iii) Detail of operation

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9

Notes (1) When the outdoor heat exchanger temperature is in the range of B-C ºC, the speed is reduced by 8 rps at each 20 seconds.

'09•SRK-DB-087D

(i) Operating conditions

(e) Cooling low outdoor air temperature protective control

(i) Operating conditions

(ii) Detail of operation

When the outdoor air temperature (TH2) is 22°C or lower continues for 20 seconds while the compressor speed is other than 0 rps.

Compressor speed: Upper/lower limit (rps)

Lower 3Upper 2Lower 2

Lower 1

Range BRange A

Upper 1Upper 3

50504430

50

445044

60

6027

Release

Release

50

SRK25, 35

SRK45

1) It controls the upper and lower limit values for the compressor speed according to the following table.

2) It checks the outdoor temperature (TH2) once every hour to judge the operation range.

'09•SRK-DB-087D

(2) When the temperature is C ºC or higher, the compressor is stopped.
(3) When the outdoor heat exchanger temperature is in the range of A-B ºC, if the compressor speed is been maintained and the operation has

●

Temperature list

Outdoor air temperature
Outdoor air temperature <

continued for more than 20 seconds at the same speed, it returns to the normal cooling operation.

SRK25, 35 SRK45

>
=

32 ºC
32 ºC

A B C A B C

53 58 63 48 53 55

40 43 46 53 58 63

(f) Cooling low outdoor air temperature protective control

'18 • SRK-SM-259

Upper limit 50 rps

ON

Lower limit 50ࠝ44ࠞ rps

EF

First time

After the
second times

Upper limit 50 rps

ON

Lower limit 44 rps

Outdoor air temperature (°C)

(iii) Reset conditions

1)

2)

(g)

Heating high pressure control

(i) Purpose

(ii) Detector

Upper limit 60 rps

ON

Lower limit 30ࠝ27ࠞ rps

CDAB

(Models SRK25, 35)

Outdoor air temperature (˚C)

ABCDEF

OFF

First time

After the
second times

Range A

Range B

Indoor air temperature ( Υ

2624

)

, E, F (Model SRK45)

Outdoor air temperature (˚C)

E FABCD

0

5721691911252228

25

(iii) Detail of operation

(Example) Fuzzy

After lapse of 10 sec. or over

After lapse of 10 sec. or over

After lapse of 10 sec. or over

A

Indoor heat exchanger temperature(°C)

(3)

(3)

lower limit

(3)

speed 30(35) rps

B

4rps

(1)

(1)

4rps

C

8rps

(2)

8rps

(2)

0rps

D

-

-

10

'09•SRK-DB-087D

CDAB

OFF

EF

Upper limit 50 rps
Lower limit 44 rps

ON

ON

Upper limit 50 rps
Lower limit 50ࠝ44ࠞ rps

ON

Upper limit 60 rps
Lower limit 30ࠝ27ࠞ rps

Outdoor air temperature (°C)

Heating high pressure control

A

B

C

D

Indoor heat exchanger temperature(°C)

4rps

(1)

8rps

(2)

8rps

(2)

4rps

(1)

0rps

-

-

After lapse of 10 sec. or over

(3)

After lapse of 10 sec. or over

(3)

After lapse of 10 sec. or over

(3)

lower limit

speed 30(35) rps

First time

After the
second times

Outdoor air temperature (˚C)

ABCDEF

1)

2)

(Models SRK25, 35)

First time

After the
second times

Outdoor air temperature (˚C)

E FABCD

, E, F (Model SRK45)

0

5721691911252228

25

2624

Indoor air temperature ( Υ

)

Range A

Range B

'09•SRK-DB-087D

(h) Heating overload protective control

10

fan fan

●

Temperature list

Models SRK25, 35 Unit : ºC

RPSmin < 50

<

50

RPSmin < 92

=

92

<

RPSmin

=

<
=

115

speed

A B C D

47 52 54 55

47.5 55 57 61

47.5-39.0 55.0-40.0 57.0-42.0 61

-

'18 • SRK-SM-259

Model SRK45 Unit : ºC Unit : ºC

RPSmin < 30

<

30

RPSmin < 40

=
<

40

RPSmin < 80

=
<

80

RPSmin < 90

=
<

90

RPSmin < 100

=

(i) Indoor unit side

1) Operating conditions

2) Detail of operation

3) Reset conditions

(ii) Outdoor unit side

1) Operating conditions

When the outdoor air temperature (TH2) is 22 (11 or 20)ºC or higher continues for 30 seconds while the compressor

speed other than 0 rps.

2) Detail of operation

Upper and lower limits of compressor speed and the outdoor unit fan speed are restricted.

Models SRK25,35

ON1
ON2

Model SRK45

ON1
ON2

A B C

45 49 50

45-49 49-55 50-57

49 55 57

49-48 55-53 57-55

48-37 53-42 55-44

Upper limit

Upper limit

Compressor command speed (rps)

Lower limit

Range A Range B

－ － － －

40 Release 60 2nd speed

Compressor command speed (rps)

Lower limit

Range A Range B

35 Release 85 It depends on compressor speed

35 35 55 2nd speed

Outdoor fan speed

Outdoor fan speed

RPSmin < 35

<

35

RPSmin < 40

=
<

40

RPSmin < 80

=
<

80

RPSmin < 95

=
<

95

RPSmin < 100

=

D

55.5

55.5-62

62

62-56

56-50.5

Protective
control

Normal
operation

OFF

ON1

10

Outdoor air temperature(°C)

3) Reset conditions

When the outdoor air temperature drops below 19 (13)ºC.

Note (1)　Values in ( ) are for the model SRK45.

22 (20)21 (19)11

ON2

Range A

Range B

Indoor air temperature ( Υ

2321

)

-

-

11