Mitsubishi Heavy Industries SRF25ZS-W Bedienungsanleitung

SERVICE MANUAL

INVERTER FLOOR STANDING TYPE

RESIDENTIAL AIR-CONDITIONERS

(Split system, air to air heat pump type)

SRF25ZS-W / SRC25ZS-W2

SRF35ZS-W / SRC35ZS-W2

SRF50ZSX-W / SRC50ZSX-W2

Manual No.’20 • SRF-SM-311

'20 • SRF-SM-311

CONTENTS

1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

(10) Timer operation

(9) Air outlet selection

(1) Operation control function by wireless remote control

(8) Flap control

(5) Selection of the annual cooling function

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

(3) Auto restart function

(2) Unit ON/OFF button

(11) Silent mode

(12) Night setback

(13) Outline of heating operation

(15) Outline of dehumidifying (DRY) operation

(14) Outline of cooling operation

(7) Economy operation

(6) High power operation

(16) Outline of automatic operation

(17) Protective control function

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(10) How to make sure of wireless remote control

(12) Outdoor unit inspection points

(11)

Inspection procedure for blown fuse on the indoor and outdoor unit PCB

(8) Phenomenon observed after short-circuit, wire breakage on sensor

(9) Checking the indoor electrical equipment

3. ELECTRICAL WIRING

4. PIPING SYSTEM

(6) Service mode (Trouble mode access function)

(7) Inspection procedures corresponding to detail of trouble

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

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

(2) Items to check before troubleshooting

(5) Self-diagnosis table

(1) Cautions

2. MAINTENANCE DATA

'20 • SRF-SM-311

ONOCEREMITNUR

OFF

HI POWER

Unit display section

ECONO light (orange)

Illuminates during ECONOMY operation.

HI POWER light (green)

Illuminates during HIGH POWER operation.

TIMER light (yellow)

Illuminates during TIMER operation.

This button can be used for turning on/off the unit when

remote control is not available.

Wireless remote control signal receiver

Unit ON/OFF button

RUN (HOT KEEP) light (green)

•Illuminates during operation.

•

Blinks when airflow stops due to the ‘HOT

KEEP’

and

‘

CLEAN operation

’.

OFF

1.5 sec.

0.5 sec.

HOT KEEP

3 sec.

1 sec.

OFF

CLEAN operation

OFF

0.5 sec.

Operation mode

invalid

OPERATION MODE select button

ON/OFF (luminous) button

TEMPERATURE button

AIR FLOW (UP/DOWN) button

TIME SET UP switch

SLEEP button

CLEAN switch

ON TIMER button

TIMER button

ACL switch

PROGRAM button

Operation section

HI/ECO button

SILENT button

OFF TIMER button

WEEKLY button

FAN SPEED button

NIGHT SETBACK button

SET/Child Lock button

CANCEL button

Transmission section

Each time the button is pressed, the mode

changes.

•The above illustration shows all controls, but in

practice only the relevant parts are shown.

Press to start operation, press again to

stop.

This button sets the room temperature.

This button changes the air flow (up/down)

direction.

This switch is for setting the time.

This button selects SLEEP operation.

This switch selects the CLEAN

operation.

This button selects ON TIMER operation.

This buttions is used for setting the cur-

rent time and timer function.

Switch for resetting microcomputer.

This button sets WEEKLY TIMER.

This button changes the HIGH POWER/

ECONOMY operation.

This buttion changes the SILENT

operation.

This button selects OFF TIMER

operation.

This button switches the WEEKLY

TIMER to ON/OFF.

Each time the button is pressed, the fan

speed changes.

This button sets NIGHT SETBACK

operation.

Use this button to set the timer and

Child Lock.

This button cancels the ON timer, OFF

timer, and SLEEP operation.

1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

(1) Operation control function by wireless remote control

Unit display section

AIR SELECTION button

AIR OUTLET SELECTION light (green)

Illuminates during upper air outlet operation.

TIMER light (yellow)

Illuminates during TIMER operation.

This button can be used for turning on/off the unit when

remotecontrol is not available.

HI POWER Light (green)

Illuminates duringHIGH POWER operation.

Blinks during heating preparation.

Unit ON/OFF button RUN (HOT KEEP) light (green)

•Illuminates during operation.

•

Blinks when airflow stops due to the ‘HOT

KEEP’

‘

CLEAN operation

’and ‘

operation

mode invalid

’.

Remote control signal receiver

1.5 sec.

OFF

0.5 sec.

HOT KEEP

3 sec.

1 sec.

OFF

CLEAN operation

ECONO light (green)

Illuminates duringECONOMY operation.

Use this button to switch between the combination of

upper and lower air outlets and upper air outlet.

Operation mode

invalid

OFF

0.5 sec.

1.5 sec.

OFF

0.5 sec.

'20 • SRF-SM-311

(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 indoor temperature (as detected

by sensor), whether to go into COOL, DRY or HEAT modes.

(3) Auto restart function

(a)

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

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

(b) The following settings will be cancelled:

(i) Timer settings

(ii) HIGH POWER operation

Notes (1) Auto restart function is set at on when the air-conditioner is shipped from the factory. 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 (J170) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram at right)

Jumper wire (J170)

Function

Operation mode

Indoor temperature

setting

Fan speed

Flap/Louver

Timer switch

COOL About 24ºC

Auto Auto Continuous

DRY About 25ºC

HEAT About 26ºC

Unit ON/OFF button

Reception

Pip

When two air-conditioners are installed in the room, use setting when the two air-conditioners are not operated with one wireless

remote control. Set the wireless remote control and indoor unit.

(a)Setting the wireless remote control

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

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

(iii) Insert batteries, Close the cover.

(b)Setting an indoor unit

(i) Turn off the power source, and turn it on after 1 minute.

(ii) Point the wireless remote control that was set according to the procedure

described on the left side at the indoor unit and send a signal by pressing

the ACL switch on the wireless remote control.

Since the signal is sent in about 6 seconds after the ACL switch is pressed,

point the wireless remote control at the indoor unit for some time.

(iii) Check that the reception buzzer sound "Pip" is emitted from the indoor unit.

At completion of the setting, the indoor unit emits a buzzer sound "Pip".

(If no reception tone is emitted, start the setting from the beginning again.)

Disconnect

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

'20 • SRF-SM-311

(a) The annual cooling control is valid from factory default setting. It is possible

to disable by cutting jumper wire (J172), or changing the setting of DIP switch

(SW2-4) on the interface kit (option) PCB if it is connected.

Note: (1) Default states of the jumper wire (J172) and the interface kit at the shipping from factory – On the

PCB, the DIP switch (SW2-4) is set to enable the annual cooling function.

(2) To cancel the annual cooling setting, consult your dealer.

(b) Content of control

(i) If the outdoor air temperature sensor (TH3) detects below 5°C, the indoor

unit speed is switched to 8th step.

(ii) If the outdoor air temperature sensor (TH3) detects higher than 7°C, the indoor unit speed is changed to the normal con-

trol speed.

Pressing the HI POWER/ECONO button intensies the operating power and initiates powerful cooling and heating operation

for 15 minutes continuously. The wireless remote control displays and the FAN SPEED display disappears.

(a) During the HIGH POWER operation, the room temperature is not controlled. When it causes an excessive cooling and

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

(b) HIGH POWER operation is not available during the DRY and the program timer operations.

(d) When the following operation are set, HIGH POWER operation will be canceled.

①When the HI POWER/ECONO button is pressed again. ④When the SILENT botton is pressed.

②When the operation mode is changed. ⑤When the NIGHT SETBACK botton is pressed.

③When it has been 15 minutes since HIGH POWER operation has started.

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

(f) After HIGH POWER operation, the sound of refrigerant owing may be heard.

Pressing the HI POWER/ECONO button initiate a soft operation with the power suppressed in order to avoid an excessive

cooling or heating. The unit operate 1.5°C higher than the setting temperature during cooling or 2.5°C lower than that during

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

(a) It will go into ECONOMY operation at the next time the air-conditioner runs in the following cases.

①When the air-conditioner is stopped by ON/OFF button during ECONOMY operation

②When the air-conditioner is stopped in SLEEP or OFF TIMER operation during ECONOMY operation

③When the operation is retrieved from CLEAN operation

(b) When the following operation are set, ECONOMY operation will be canceled.

①When the HI POWER/ECONO button is pressed again

②When the operation mode is changed DRY to FAN

③When the NIGHT SETBACK botton is pressed

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

Jumper wire

(J172)

Interface kit

(SC-BIKN2-E)

SW2-4

Function

Shorted ON Enabled

Shorted OFF Disabled

Open ON Disabled

Open OFF Disabled Jumper wire (J172)

5 7

OFF

Outdoor air temperature ( C)

①at the start of operation

②one hour after the start of operation

③two hours after the start of operation

Temperature

adjustment

Cooling Heating

①＋0.5 ①−1.0

②＋1.0 ②−2.0

③＋1.5 ③−2.5

Mode

Item

(5) Selection of the annual cooling function

(6) High power operation

(7) Economy operation

'20 • SRF-SM-311

(8) Flap control

Control the ap by AIR FLOW 

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

(b) Swing

(i) Swing ap

Flap moves in upward and downward directions continuously.

When you press the AIR FLOW 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 operation is started.

(d) When not operating

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

COOL , DRY, FAN

Remote control

display

HEAT

Approx. 60°

Approx. 44°

Approx. 50°

Approx. 32°

Approx. 38°

Approx.

21.5°

Approx. 5°

Approx.

21.5°

Approx. 12°

󱓻



Angle of Flap from horizontal

(Swing)(Flap stopped)

Approx.60°

Approx.12°

Approx.44°

Approx.

5°

In HEAT operation In COOL, DRY, FAN operation

Approx. 45°

Approx. 75°

Approx.

5°

Approx. 60°

(a) Flap

Each time when you press the AIR FLOW 

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

AIR OUTLET SELECTION

light : OFF

AIR OUTLET SELECTION

light : ON

Upper air outletUpper and lower air outlets

AIR SELECTION button

(9) Air outlet selection

(b) Auto air outlet selection

(i) COOL, DRY operation

1) In case both lower and upper outlets operation is selected in Cooling or Dry

operation, both outlets will be kept for sixty minutes after the start or until

indoor temperature is below the setting point. And then the air outlet will change

to the upper outlet. That state will be maintained until switch is turned off.

2) In case both outlets operation with auto fan speed mode is selected, the upper

outlet will be kept for ten minutes after the start or until indoor temperature is

close to reaching the setting point . And then the air outlet will change to both

outlets in order to spread comfort air to every corner.

(a) AIR SELECTION button can switch between the combination of upper and lower air outlets and upper air

outlet. Not operable while the air-conditioner is OFF.

(i) Each time the AIR SELECTION button is pressed. The combination of the

upper and lower air outlets and the upper air outlet can be switched.

(ii) When the upper air outlet is selected, AIR OUTLET SELECTION light on

the unit display area will light green.

'20 • SRF-SM-311

(ii) HEAT operation

1) In case both lower and upper outlets operation with auto fan speed mode is selected, the

lower outlet will be kept for twenty minutes after the start or until room temperature is

close to reaching the setting point . And then the air outlet will change to both outlets.

That state will be maintained until the switch is turned off.

2) Automatic adjustment of lower air outlet direction prevents stirring up of warm air

and keeps optimum comfort at oor level.

(10)

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.

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

(d) Weekly timer operation

Timer operation (ON timer, OFF timer) can be set up to 4 times a day for each weekday.

(11)

Silent mode

As “Silent mode start” signal is received from the wireless remote control, it operates by dropping the outdoor fan tap and the

compressor command speed.

(12)

Night setback

As “Night setback” signal is received from the wireless remote control, the heating operation starts with the setting temperature

at 10℃.

Outdoor fan tap

(Upper limit)

Compressor command

speed (Upper limit)

Cooling Heating Cooling Heating Cooling Heating

SRF25ZS-W SRF35ZS-W SRF50ZSX-W

4th speed

37 rps

4th speed

49 rps

5th speed

46 rps

4th speed

56 rps

5th speed

43 rps

5th speed

48 rps

(a) Operation of major functional components in heating mode

ON OFF

ON ON

ON OFF

(few minutes ON)

ON ON(HOT KEEP)

OFF

(3 minutes ON)

OFF

Thermostat ON Thermostat OFF Failure

Heating

Compressor

Indoor fan motor

Outdoor fan motor

4-way valve

(13) Outline of heating operation

'20 • SRF-SM-311

(b) Details of control at each operation mode (pattern)

(i) Fuzzy operation

Deviation between the room temperature setting correction temperature and the return 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.

(ii) Hot keep operation

If the hot keep operation is selected during the heating operation, the indoor blower is controlled based on the temperature

of the indoor heat exchanger (Th2) to prevent blowing of cool wind.

However, if the fan speed setting is Hi and room temperature is 19ºC or higher, this control is not executed.

110rps

80rps

70rps

SRF50ZSX-W

115rps

98rps

92rps

SRF35ZS-W

102rps

76rps

66rps

SRF25ZS-W

Model

Fan speed

Auto

MED

60rps20

80rps20

58rps

ULO

(i) Starting conditions (Defrost operation can be started only when all of the following conditions are satised.)

1) After start of heating operation

When it elapsed 35 minutes (Accumulated compressor operation time)

2) After end of defrost operation

When it elapsed 35 minutes (Accumulated compressor operation time)

3) Outdoor heat exchanger temperature sensor (TH1)

When the temperature has been below -5ºC for 3 minutes continuously

4) The difference between the outdoor air sensor temperature and the outdoor heat exchanger sensor temperature (TH2-TH1)

¡The outdoor air temperature ≧0°C (SRF50 : ≧-2ºC) : 7°C or higher

-15°C ≦The outdoor air temperature ＜0°C (SRF50 : ≧ -2ºC) : 3/15 × The outdoor air temperature + 7°C or higher (SRF25)

4/15 × The outdoor air temperature + 7°C or higher (SRF35, 50)

¡The outdoor air temperature < -15°C : -5°C or higher

-20

-20 -15 -10 -5 0 5 10

-15

-10

-5

Outdoor air temperature (℃)

Outdoor heat exchanger temperature (

℃)

-20

-20 -15 -10 -5 0 5 10

-15

-10

-5

Outdoor air temperature (℃)

Outdoor heat exchanger temperature (℃)

Defrost operation

start

Defrost operation

start

Defrost operation start temperature

Models 20～35 Model 50

-20

-20 -15 -10 -5 0 5 10

-15

-10

-5

Outdoor air temperature (℃)

Outdoor heat exchanger temperature (℃)

-20

-20 -15 -10 -5 0 5 10

-15

-10

-5

Outdoor air temperature (℃)

Outdoor heat exchanger temperature (℃)

Defrost operation

start

Defrost operation

start

Defrost operation start temperature

Models 20～35 Model 50

SRF25 SRF35

'20 • SRF-SM-311

(14) Outline of cooling operation

ON OFF OFF

OFF OFF OFF

ON OFF

(few minutes ON)

OFF

(few minutes ON)

ON ON OFF

Thermostat ON Thermostat OFF Failure

Cooling

Compressor

Indoor fan motor

Outdoor fan motor

4-way valve

(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 return air temperature.

86rps

58rps

48rps

SRF50ZSX-W

104rps

71rps

58rps

SRF35ZS-W

72rps

48rps

40rps

SRF25ZS-W

Model

Fan speed

38rps15

46rps15

34rps

Auto

MED

ULO

-20

-20 -15 -10 -5 0 5 10

-15

-10

-5

Outdoor air temperature (

℃

)

Outdoor heat exchanger temperature (

℃)

Defrost operation

start

Defrost operation start temperature

Model SRF50

SRF50

5) During continuous compressor operation

In addition, when the speed command from the indoor control of the indoor unit during heating operation has counted 0

rps 10 times or more and all conditions of 1), 2) and 3) above and the outdoor air temperature is 3°C or less are satised

(note that when the temperature for outdoor heat exchanger temperature sensor (TH1) is -5°C or less: 62 rps or more,

-4°C or less: less than 62 rps), defrost operation is started.

(ii) Ending conditions (Operation returns to the heating cycle when either one of the following is satised.)

1) Outdoor heat exchanger temperature sensor (TH1) : 13ºC (SRF50 : 10°C) or higher

2) Continued time of defrost operation → For more than 15 minutes

Max. 15 minutes

Heating operatio

¡Defrost operation

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

2-7 minutes 

Hot keep operation

'20 • SRF-SM-311

(16) Outline of automatic operation

(15) Outline of dehumidifying (DRY) operationion

(a) Purpose of DRY mode

The purpose is "Dehumidication", and not to control the humidity to the target condition.

Indoor/outdoor unit control the operation condition to reduce the humidity, and also prevent over cooling.

(b) Outline of control

(i) Indoor fan speed and compressor are controlled by the area which is selected by the temperature difference.

(ii) The indoor unit check the current area by every 5 minutes, and operate by the next checking.

When the outside temperature and room temperature is low for cooling operation, indoor unit can not operate in cooling, and

dehumidify. In this case, the units operate in heating to rise the room temperature, and after that start DRY operation.

Indoor fan speed

Area

DCBA

Me speed

Indoor fan

speedULo(Lo) speed

STOP

Limited䠄Lower than

normal cooling operation䠅

Compressor

Limited

speed

Minimum 䠄Lower than the speed in ”Area A”䠅

STOP

set temperature

Difference between set temperature and return air temperature

Heating

Cooling

SP: Setting temperature

Indoor air

temperature (˚C)

Outdoor air temperature (˚C)

(b) Operation mode is changes when keep cooling and heating thermostat off 20 minutes and be satisfied following

conditions.

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

(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.

(e) When the unit is operated automatically with the wired remote control, the cooling operation iscontrolled according to

the display temperatures while the setting temperature is compensated by ＋2℃ during heating.

※It can not be changed to heating mode if outdoor air temperature is 28℃or higher.

Heating SP: Setting temperature

Indoor air temperature−Setting temperature (˚C)

Keep operation

mode

Cooling

Signals of wireless remote control (Display)

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

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

Setting

temperature

Cooling

Heating

SP＋1

SP−1

Unit : ℃

(a) Determination of operation mode

Operation mode is determined by indoor air temperature and outdoor air temperature as following.

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