Mitsubishi Heavy Industries SRK20ZJX-S User manual

SERVICE MANUAL
Manual No.'10•SCM-SM-094
INVERTER MULTI-SPLIT SYSTEM
RESIDENTIAL AIR CONDITIONERS
(Split system, air to air heat pump type)
(OUTDOOR UNIT)
SCM40ZJ-S
SCM45ZJ-S
SCM50ZJ-S
SCM60ZJ-S
SCM71ZJ-S
SCM80ZJ-S
(INDOOR UNIT)
Wall mounted type
SRK20ZJX-S
SRK25ZJX-S
SRK35ZJX-S
SRK50ZJX-S
SRK60ZJX-S
SRK20ZJ-S
SRK25ZJ-S
SRK35ZJ-S
SRK50ZJ-S
Floor standing type
SRF25ZJX-S
SRF35ZJX-S
SRF50ZJX-S
Ceiling concealed type
SRR25ZJ-S
SRR35ZJ-S
SRR50ZJ-S
SRR60ZJ-S
Ceiling cassette-4way compact type
FDTC25VD
FDTC35VD
FDTC50VD
FDTC60VD

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CONTENTS
............................................ 30
(1) Summary ........................................................................................... 28
(1) Summary ............................................................................................. 30
(4) Defrosting operation ......................................................................... 29
(2) Operation of major functional components in heating mode .............. 28
(2) Operation of major functional components in cooling mode ............... 30
(3) Hot keep operation .......................................................................... 28
(1) SRK20～60ZJX-S,SRF and SRR series
........................................................................ 31
(2) SRK20～60ZJ-S series
...................................................................................... 31
(3) FDTC series
1.1 SRK,SRF and SRR series ................................................................... 5
1.2 FDTC series ........................................................................................ 16
1.3 Outline of heating operation ............................................................. 28
1.4 Outline of cooling operation ............................................................. 30
1.5 Outline of automatic operation ......................................................... 30
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ............... 5
(6) Air outlet selection (SRF series only) .................................................. 12
....................................................... 9
(1) Operation control function by remote controller
(5) Flap and louver control ...................................................................... 10
(4) Custom cord switching procedure
......................................................................... 9(3) Auto restart function
(2) Unit ON/OFF button ........................................................................... 8
.................................. 5
(1) Remote controller (Option parts)
............................ 19(3) Operation control function by the indoor controller
(2) Operation control function by the wired remote controller ................. 18
...................................................... 16
(7) 3D auto operation (SRK series only) .................................................. 12
(8) Timer operation .................................................................................. 13
(9) Installation location setting (SRK series only) ................................... 14
....................................................... 14
(11) Drain motor (DM) control (SRR series only) ..................................... 15
(10) Determining the operating mode
1.6 Operation permission/prohibition control ...................................... 32
by releasing the jumper wire (J3) on the indoor PCB
....................... 32(3) In the case of CnT input OFF (Operation prohibition)
(2) In the case of CnT input ON (Operation permission) ........................ 32
......................... 32
(1) The operation mode is switched over between Permission and Prohibition

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............................... 39
(12) Current safe ...................................................................................... 37
(18) Serial signal transmission error protection ....................................... 39
(11) Compressor overheat protection ...................................................... 37
(17) Regulation of outdoor air flow .......................................................... 38
(15) Indoor fan motor protection .............................................................. 38
(16) Discharge pipe sensor disconnection protection control ................. 38
(13) Current cat ....................................................................................... 38
(19) Rotor lock ........................................................................................ 39
(20) Outdoor fan motor protection ........................................................... 39
(14) Outdoor unit failure ........................................................................... 38
(21) Outdoor fan control at low outdoor temperature
.................................................. 40(22) Outdoor unit fan control at overload
1.8 Protective control function ................................................................. 33
1.7 External control (remote display)/control of input signal ............... 32
(2) Control of input signal ......................................................................... 32
(1) External control (remote display) output ............................................. 32
(7) Heating low outdoor temperature protective control
............................................................................... 36(9) Crankcase heater
.............................................................................. 37(10) Inching prevention
(8) Freezing cycle system protective control ........................................... 36
......................... 36
(1) Frost prevention control .................................................................... 33
(2) Cooling overload protective control .................................................... 33
........................................................... 34
(5) Heating high pressure control .......................................................... 35
(6) Heating overload protective control ................................................... 35
(4) Cooling low outdoor temperature protective control
(3) Cooling high pressure control
.......................... 34
2.1 SRK,SRF and SRR series ................................................................. 41
2. MAINTENANCE DATA ........................................................................... 41
(1) Cautions ........................................................................................... 41
(2) Items to check before troubleshooting ............................................. 41
...... 41
(4) Troubleshooting procedure (If the air conditioner runs)
(3) Troubleshooting procedure (If the air conditioner does not run at all)
.................. 42
(5) Self-diagnosis table .......................................................................... 43
(6) Service mode (Trouble mode access function) ............................... 44
.................. 52
(8) Phenomenon observed after shortcircuit, wire breakage on sensor
(7) Inspection procedures corresponding to detail of trouble
......... 56

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..............................................................147
3.2 Indoor units ........................................................................................119
(3) Models SCM71ZJ-S,80ZJ-S ..........................................................135
3.1 Outdoor units ......................................................................................116
(2) Models SCM50ZJ-S,60ZJ-S ..........................................................131
(1) Models SCM40ZJ-S,45ZJ-S ..........................................................127
(1) Wall mounted type (SRK) ..............................................................139
(2) Floor standing type (SRF)
.........................................................151(3) Ceiling concealed type (SRR)
.................................155(4) Ceiling cassette-4way compact type (FDTC)
2.2.1 Diagnosing of microcomputer circuit ........................................ 63
2.2.2 Troubleshooting flow .................................................................. 75
2.2 FDTC series ....................................................................................... 63
5.1 Installation of outdoor unit ............................................................127
5.2 Installation of indoor unit ..............................................................139
(11) Outdoor unit inspection points ......................................................... 59
............................................................................... 76(2) Troubleshooting
............................. 58(10) How to make sure of wireless remote controller
(1) List of troubles .................................................................................. 75
(1) Selfdiagnosis function ...................................................................... 63
(2) Troubleshooting procedure .............................................................. 66
................................................... 66
(5) Inverter checker for diagnosis of inverter output ............................. 71
(6) Outdoor unit inspection points ........................................................ 72
(4) Check of anomalous operation deta with the remote controller
(3) Troubleshooting at the indoor unit
........ 70
(9) Checking the indoor electrical equipment ....................................... 57
3. ELECTRICAL WIRINGS ........................................................................116
4. PIPING SYSTEMS ................................................................................124
5. APPLICATION DATAS .........................................................................127

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■How to read the model name
Example:
Indoor unit
SRK 20 Z
Series code
Inverter type
Product capacity
Model name SRK : Wall mounted type
SRF : Floor standing type
SRR : Ceiling concealed type
FDTC : Ceiling cassette-4 way
compact type
JX-S
Example:
Outdoor unit
SCM 60 Z
Series code
Inverter type
Product capacity
Model name
(Outdoor unit)
J-S
Capacity
Model
Floor standing type (SRF)
Outdoor unit to be combined (SCM)
20 25 35 6050
SCM40ZJ-S,45ZJ-S,50ZJ-S,60ZJ-S,71ZJ-S,80ZJ-S
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Ceiling concealod type (SRR)
■Table of models
Wall mounted type (SRK-ZJX-S)
Wall mounted type (SRK-ZJ-S)
Ceiling cassette-4way compact type
(FDTC)

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1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.1 SRK, SRF and SRR series
(1) Operation control function by remote control
4Operation section
Remote controller
SRK series
FAN SPEED button
OPERATION MODE select button
ON/OFF (luminous) button
HI POWER/ECONO button
AIR FLOW (UP/DOWN) button
SLEEP button
CLEAN switch
ON TIMER button
AIR FLOW (LEFT/RIGHT) button
3D AUTO button
ALLERGEN CLEAR button
RESET switch
OFF TIMER button
TEMPERATURE button
CANCEL button
• The above illustration shows all controls, but in practice
only the relevant parts are shown.
Each time the button is pressed, the
display is switched over in turn.
FAN SPEED button
This button changes the HIGH POWER/
ECONOMY mode.
HI POWER/ECONO button
These buttons set the indoor temperature.
(These buttons are used for setting the
current time and timer function as well.)
TEMPERATURE button
This button selects ON TIMER operation.
ON TIMER button
This button selects SLEEP operation.
SLEEP button
This switch selects the CLEAN mode.
CLEAN switch
This button cancels the ON timer, OFF
timer, and SLEEP operation.
CANCEL button
Each time the button pressed, the
display is switched over in turn.
OPERATION MODE select button
Press to start operation, press again to
stop.
This button changes the air flow (up/down)
direction.
SRR series
Air flow direction adjustment
can not be performed.
AIR FLOW (UP/DOWN) button
This button selects OFF TIMER operation.
OFF TIMER button
This switch is for resetting microcomputer
and setting time.
ACL switch
ON/OFF (luminous) button
Operation section
SRF series
4Operation section

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SRR series
4Operation section
Unit indication section
Model SRK20 ~ 60ZJX-S
Illuminates during 3D AUTO operation
TIMER light (yellow)
•
•
ON
OFF
1.5 sec.
0.5 sec.
3 sec.
1 sec.
ON
OFF
Unit ON/OFF button
This button can be used for turning on/off the unit when
remote controller is not available.
Remote controller signal receiver
RUN (HOT KEEP) light (green/blue)
Illuminates during operation.
green : except ECONO operation
blue : ECONO operation
Blinks when airflow stops due to the ‘HOT
KEEP’ and ‘CLEAN operation’.
HOT KEEP
CLEAN operation
Illuminates during TIMER operation.
3D AUTO light (green)
HI POWER light (green)
Illuminates during HIGH POWER operation.

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Model SRK20~50ZJ-S
3D AUTO light (green)
Illuminates during 3D AUTO 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.
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 .
ON
OFF
1.5 sec.
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
Model SRF25~50ZJX-S
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 remote
controller is not available.
HI POWER Light (green)
Illuminates during HIGH POWER operation.
Unit ON/OFF button
Model All models
RUN (HOT KEEP) light (green)
• Illuminates during operation.
•
Blinks when airflow stops due to the ‘HOT
KEEP’
and ‘ CLEAN operation ’.
Remote controller signal receiver
1.5 sec.
ON
OFF
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
ECONO light (green)
Illuminates during ECONOMY operation.
Use this button to switch between the combination of upper and
lower air outlets and upper air outlet.

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Model SRR25~60ZJ-S
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
ON
OFF
1.5 sec.
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
Unit ON/OFF button
(2) Unit ON/OFF button
When the remote controller batteries become weak, or if the remote controller 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 the cooling, thermal dry or heating modes.
Function
operation mode
Indoor temperature
setting
Fan speed Flap/Louver Timer Switch
Cooling About 24ºC
Auto Auto Continuous
Thermal dry About 25ºC
Heating About 26ºC
Unit ON/OFF butto
n
Unit ON/OFF button
Unit ON/OFF button
・
Model SRK20~60ZJX-S
・
Model SRK20~50ZJ-S
・
Model SRF25~50ZJX-S
・
Model SRR25~60ZJ-S

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(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:
1) Timer settings
2) HIGH POWER operations
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 or JA1) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram at right)
• ModelSRK20~60ZJX-S • Model SRK20~50ZJ-S
SRF25~50ZJX-S
SRR25~60ZJ-S
Jumper wire (J170)
Jumper wire (JA1)
(4) Custom cord switching procedure
If two wireless remote controller are installed in one room, in order to prevent wrong op eration due to mixed signals, please
modify the printed circuit board in the indoor unit’s controlbox and the remote controller using the following procedure.
Be sure to modify both boards. If only one board is modified, receiving (and operation) cannot be done.
(a) Modifying the indoor printed circuit board
Take out the printed circuit board from the control box and cut off jumper wire (J171 or JA2) using wire cutters.
After cutting of the jumper wire, take measures to prevent contact with the other the lead wires, etc.
• ModelSRK20~60ZJX-S • Model SRK20~50ZJ-S
SRF25~50ZJX-S
SRR25~60ZJ-S
Jumper wire (J171)
Jumper wire (JA2)