Mitsubishi Heavy Industries FDTC25VH1 Bedienungsanleitung

SM-

SERVICE MANUAL

SRR25ZS-W

SRR35ZS-W

FDTC25VH1

FDTC35VH1

(Split system, air to air heat pump type)

INVERTER RESIDENTIAL

AIR-CONDITIONERS

Ceiling concealed type

4-way ceiling cassette type

285

'20 • SR-SM-285

1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ............... 3

1.1 Models SRR25ZS-W,35ZS-W .................................................................. 3

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

(1) Operation control function by wireless remote control

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

............................................................................. 4(3) Auto restart function

(2) Unit ON/OFF button .............................................................................. 4

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

.............................................................................. 5(7) Economy operation

........................................................................... 5(6) High power operation

(5) Selection of the annual cooling function .............................................. 5

(8) Timer operation .................................................................................... 6

CONTENTS

(12) Outline of cooling operation ................................................................. 8

(11) Outline of heating operation ................................................................. 6

(13) Outline of dehumidifying (DRY) operation .............................................. 8

(14) Outline of automatic operation ............................................................ 9

(15) Protective control function ................................................................... 9

........................ 47

.................................................................................. 46

1.2 Models FDTC25VH1, 35VH1 .................................................................. 15

1.2.1 Remote control (option parts)............................................................... 15

1.2.3 Operation control function by the indoor control................................... 21

1.2.2 Operation control function by the wired remote control........................ 18

1.2.4 Operation control function by the outdoor control................................. 40

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

2.1 SRR series ................................................................................................ 46

(3) Troubleshooting procedure

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

........ 46

(1) Cautions ................................................................................................ 46

(2) Items to check before troubleshooting ................................................. 46

(10) How to make sure of wireless remote control ....................................... 64

.............................................................. 65

(12) Outdoor unit inspection points

(5) Self-diagnosis table .............................................................................. 48

(6) Service mode (Trouble mode access function) .................................... 49

(8)

Phenomenon observed after short-circuit, wire breakage on sensor

.......... 62

(7) Inspection procedures corresponding to detail of trouble ..................... 57

(9) Checking the indoor electrical equipment ............................................. 62

2. MAINTENANCE DATA

(9) Silent mode .......................................................................................... 6

(10) Night setback ....................................................................................... 6

... 64

(11)

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

'20 • SR-SM-285

(3) Troubleshooting at the indoor unit ........................................................ 70

(2) Troubleshooting procedure ................................................................... 70

(5) Check of anomalous operation data with the remote control ................ 74

(6) Inverter checker for diagnosis of inverter output .................................. 76

(7) Outdoor unit inspection points ............................................................... 77

.................................................................................... 80(2) Troubleshooting

...................................................................................... 79(1) List of troubles

2.2.2 Troubleshooting flow

(4) Troubleshooting at the outdoor unit ...................................................... 73

.......................................................................... 79

3. ELECTRICAL WIRING .................................................................................122

4. PIPING SYSTEM ..........................................................................................125

.............................................................................................. 67

2.2 FDTC series

2.2.1 Diagnosing of microcomputer circuit ............................................... 67

(1) Selfdiagnosis function ........................................................................... 67

'20 • SR-SM-285

1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

1.1 Models SRR25ZS-W, 35ZS-W

(1) Operation control function by wireless remote control

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.

Unit display sectionUnit display section

RUN (HOT KEEP) light (green)

・Illuminates during operation.

・

Blinks when airflow stops due to the

‘

HOT

KEEP

’

and

‘

CLEAN operation

’

ECONO light (orange)

Illuminates during ECONOMY operation.

TIMER light (yellow)

Illuminates during TIMER operation.

HI POWER light (green)

Illuminates during HIGH POWER operation.

Unit ON/OFF button

This button can be used for turning on/off the

unit when wireless remote control is not available.

Wireless remote control signal receiver

OFF

1.5 sec.

0.5 sec.

HOT KEEP

3 sec.

1 sec.

OFF

CLEAN operation

Operation mode

invalid

OFF

0.5 sec.

'20 • SR-SM-285

(2) Unit ON/OFF button

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

ton 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 sen-

sor), 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. Con-

sult 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)

RUN (HOT KEEP) light (green)

・Illuminates during operation.

・

Blinks when airflow stops due to the

‘

HOT

KEEP

’

and

‘

CLEAN operation

’

ECONO light (orange)

Illuminates during ECONOMY operation.

TIMER light (yellow)

Illuminates during TIMER operation.

HI POWER light (green)

Illuminates during HIGH POWER operation.

Unit ON/OFF button

This button can be used for turning on/off the

unit when remote control is not available.

Remote control signal receiver

OFF

1.5 sec.

0.5 sec.

HOT KEEP

3 sec.

1 sec.

OFF

CLEAN operation

Unit ON/OFF button

Function

Operation mode

Indoor temperature

setting

Fan speed

Flap/Louver

Timer switch

COOL About 24ºC

Auto Auto Continuous

DRY About 25ºC

HEAT About 26ºC

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.

ࠉ

(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

ࠉ

(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 display section 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 display section for some time.

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

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

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

Disconnect

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

Reception

Peep

'20 • SR-SM-285

(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 17°C, the indoor unit speed is changed to the normal

control speed.

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 17

OFF

Outdoor air temperature ( C)

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 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 flowing may be heard.

(6) High power operation

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℃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.

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.

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

(7) Economy operation

(5) Selection of the annual cooling function

'20 • SR-SM-285

(b) Sleep timer operation

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

(8)

Timer operation

(a) Comfortable timer setting (ON timer)

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

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 indoor temperature at the setting time (temperature of room tempera-

ture sensor) and the setting temperature.

(9)

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.

(10)

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

SRR25ZS-W SRR35ZS-W

4th speed

37 rps

4th speed

46 rps

5th speed

46 rps

4th speed

56 rps

(11)

Outline of heating operation

(d) Weekly timer operation

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

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

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

(i) Fuzzy operation

Deviation between the indoor temperature setting correction temperature and the return air temperature is calcu-

lated in accordance with the fuzzy rule, and used for control of the air capacity and the compressor speed.

When the defrosting, 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.

30-115rps

30-62rps

30-46rps

SRR35ZS-W

30-102rps

30-58rps

30-76rps30-72rps

30-42rps

SRR25ZS-W

Model

Fan speed

Auto

MED

ULO

(a) Operation of major functional components in heating mode

'20 • SR-SM-285

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 (TH2) 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 (TH2) : 13ºC 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

(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 (TH2)

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 temperature sensor

¡The outdoor air temperature ≧0°C : 7°C or higher

¡-15°C ≦The outdoor air temperature ＜0°C : 3/15 × The outdoor air temperature + 7°C or higher (SRR25)

4/15 × The outdoor air temperature + 7°C or higher (SRR35)

¡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

SRR25 SRR35

'20 • SR-SM-285

(12) Outline of cooling operation

(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 be-

tween the indoor temperature setting correction temperature and the retum air temperature.

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

20-96rps

20-74rps

20-58rps

SRR35ZS-W

20-74rps

20-55rps

20-45rps

SRR25ZS-W

Model

Fan speed

Auto

MED

20-44rps20-34rps

ULO

(13) 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 unit 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 unit fan speed

Area

DCBA

Me speed

Indoor unit

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

Setting temperature

Difference between setting temperature and return temperature

(a) Operation of major functional components in cooling mode

'20 • SR-SM-285

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

operation mode, changes the operation mode.

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

lected 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 sig-

nals of the wireless remote control and the setting temperature.

(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.

(14) 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 be-

gins in the automatic operation.

27.5

25.5

19.5

Heating

Dehumidifying

Cooling

Indoor air temperature (˚C)

Outdoor air temperature (˚C)

(i)

(ii)

(iii)

When both the indoor and the outdoor air temperatures are in the range “A”, cooling or heating is switched depending on

the difference between the setting temperature and the indoor air temperature.

When the operation mode has been judged following the change of setting temperature with the remote control, the hourly

judgment of operation mode is cancelled.

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

Signals of wireless remote control (Display)

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

Setting

temperature

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

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

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

Unit : ºC

(a) Frost prevention control (During cooling or dehumidifying)

(15) Protective control function

(17) Frost prevention control

( i ) Operating conditions

(

) Detail of anti-frost operation

(iii) Reset condition

Indoor heat exchanger

temperature (ºC)

Operation mode

Item Protective control Reset

Compressor operation

Indoor fan

Forced outage Operation instruction

Depends on operation mode

2.51)

Reset

Protective

control

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