Mitsubishi Heavy Industries FDT100VNAWVH User manual

(Split system, air to air heat pump type)
DUCT CONNECTED-LOW/MIDDLE STATIC PRESSURE TYPE
Single type
FDUM100VNAWVH
100VSAWVH
125VNAWVH
125VSAWVH
140VNAWVH
140VSAWVH
Twin type
FDUM100VNAWPVH
100VSAWPVH
125VNAWPVH
125VSAWPVH
140VNAWPVH
140VSAWPVH
Triple type
FDUM140VNAWTVH
140VSAWTVH
CEILING CASSETTE-4 WAY COMPACT TYPE
Twin type
FDTC100VNAWPVH
100VSAWPVH
125VNAWPVH
125VSAWPVH
Single type
FDT100VNAWVH
100VSAWVH
125VNAWVH
125VSAWVH
140VNAWVH
140VSAWVH
CEILING CASSETTE-4 WAY TYPE
Twin type
FDT100VNAWPVH
100VSAWPVH
125VNAWPVH
125VSAWPVH
140VNAWPVH
140VSAWPVH
Triple type
FDT140VNAWTVH
140VSAWTVH
Triple type
FDTC140VNAWTVH
140VSAWTVH
MICRO INVERTER PACKAGED AIR-CONDITIONERS
Single type
SRK100VNAWZR
100VSAWZR
WALL MOUNTED TYPE
Twin type
SRK100VNAWPZSX
100VSAWPZSX
125VNAWPZSX
125VSAWPZSX
140VNAWPZR
140VSAWPZR
Triple type
SRK140VNAWTZSX
140VSAWTZSX
DUCT CONNECTED-HIGH STATIC PRESSURE TYPE
Single type
FDU100VNAWVH
100VSAWVH
125VNAWVH
125VSAWVH
140VNAWVH
140VSAWVH
(OUTDOOR UNIT)
FDC100VNA-W
100VSA-W
125VNA-W
125VSA-W
140VNA-W
140VSA-W
(INDOOR UNIT)
FDT50VH
60VH
71VH
FDE50VH
60VH
71VH
V Multi System
Single type
FDE100VNAWVH
100VSAWVH
125VNAWVH
125VSAWVH
140VNAVWH
140VSAVWH
Twin type
FDE100VNAWPVH
100VSAWPVH
125VNAWPVH
125VSAWPVH
140VNAWPVH
140VSAWPVH
CEILING SUSPENDED TYPE
Triple type
FDE140VNAWTVH
140VSAWTVH
Manual No.'19 • PAC-SM-309
SERVICE MANUAL
updated January 27, 2020

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TABLE OF CONTENTS
1. MICRO INVERTER PACKAGED AIR-CONDITIONERS .................................... 2
2. V MULTI SYSTEM............................................................................................... 201

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1. MICRO INVERTER PACKAGED AIR-CONDITIONERS
CONTENTS
1.1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER.................. 5
1.1.1 Remote control ....................................................................................... 5
1.1.2 Operation control function by the wired remote control .................... 10
1.1.3 Operation control function by the indoor control ............................... 13
(Ⅰ) FDT, FDTC, FDU, FDUM, FDE series ....................................................... 13
(1) Auto operation ........................................................................................... 13
(2) Operations of functional items during cooling/heating .............................. 14
(3) Dehumidifying (DRY) operation................................................................. 14
(4) Timer operation ......................................................................................... 15
(5) Hot start (Cold draft prevention at heating) ............................................... 16
(6) Hot keep.................................................................................................... 17
(7) Auto swing control (FDT, FDTC, FDE only)............................................... 17
(8) Thermostat operation ................................................................................ 18
(9) Filter sign................................................................................................... 19
(10) Compressor inching prevention control..................................................... 19
(11) Drain pump control .................................................................................... 20
(12) Drain pump motor (DM) control................................................................. 20
(13) Operation check/drain pump test run operation mode .............................. 20
(14) Cooling, dehumidifying frost protection ..................................................... 21
(15) Heating overload protection ...................................................................... 21
(16) Anomalous fan motor ................................................................................ 21
(17) Plural unit control - Control of 16 units group by one remote control ........ 22
(18) High ceiling control.................................................................................... 22
(19)
Abnormal temperature sensor (retun air/indoor heat exchanger) broken wire/short-circuit detection ..... 23
(20) External input/output control (CnT or CnTA) ............................................. 23
(21) Operation permission/prohibition............................................................... 25
(22) Temporary stop input................................................................................. 27
(23) Selection of cooling/heating external input function .................................. 27
(24) Fan control at heating startup.................................................................... 28
(25)
Room temperature detection temperature compensation during heating ....... 28
(26) Return air temperature compensation....................................................... 28
(27) High power operation (RC-EX3A only)...................................................... 28
(28) Energy-saving operation (RC-EX3A only)................................................. 28
(29) Warm-up control (RC-EX3A only) ............................................................. 28
(30) Home leave mode (RC-EX3A only)........................................................... 28
(31) Auto temperature setting (RC-EX3A only)................................................. 28
(32) Fan circulator operation (RC-EX3A only) .................................................. 29
(33) The operation judgment is executed every 5 minutes (RC-EX3A only) .... 29

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(34) Auto fan speed control (RC-EX3A only) .................................................... 29
(35) Indoor unit overload alarm (RC-EX3A only) .............................................. 29
(36) Peak-cut timer (RC-EX3A only)................................................................. 29
(37) Motion sensor control (RC-EX3A only)...................................................... 30
(Ⅱ) SRK Seris .................................................................................................. 32
(1) Unit ON/OFF button .................................................................................. 32
(2) Auto restart function .................................................................................. 32
(3) Auto swing control ..................................................................................... 33
(4) Timer operation ......................................................................................... 34
(5) Outline of heating or cooling operation...................................................... 35
(6) Indoor fan motor protection ....................................................................... 35
(7) Serial signal transmission error protection ................................................ 35
(8) Plural unit control - Control of 16 units group by one remote control ........ 35
(9) Filter sign................................................................................................... 36
(10) Outline of automatic operation .................................................................. 36
(11) Frost prevention control............................................................................. 38
(12) Dew prevention control ............................................................................. 38
(13) Outline of dehumidifying (DRY) operation................................................. 40
1.1.4 Operation control function by the outdoor control............................ 41
(1) Determination of comressor speed (Frequency)....................................... 41
(2) Compressor start control........................................................................... 41
(3) Compressor soft start control .................................................................... 42
(4) Outdoor fan control.................................................................................... 43
(5) Defrost operation....................................................................................... 44
(6)
Protective control/anomalous stop control by compressor,s number of revolutions ..... 45
(7) Silent mode ............................................................................................... 48
(8) Test run...................................................................................................... 48
(9) Pump-down control ................................................................................... 49
1.2 MAINTENANCE DATA................................................................................... 50
1.2.1 Diagnosing of microcomputer circuit.................................................. 50
(1) Selfdiagnosis function ................................................................................. 50
(2) Troubleshooting procedure.......................................................................... 55
(3) Troubleshooting at the indoor unit............................................................... 55
(4) Troubleshooting at the outdoor unit............................................................. 67
(5) Check of anomalous operation data with the remote control ...................... 77
(6) Inverter checker for diagnosis of inverter output ......................................... 79
(7) Outdoor unit control failure diagnosis circuit diagram ................................. 80
1.2.2 Troubleshooting ow ............................................................................. 82
(1) List of troubles............................................................................................. 82
(2) Troubleshooting........................................................................................... 84

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1.3 DISASSEMBLY PROCEDURE ......................................................................174
(1) Indoor unit .................................................................................................174
(2) Outdoor unit...............................................................................................186
1.4 ELECTRICAL WIRING...................................................................................188
(1) Indoor unit .................................................................................................188
(2) Outdoor unit...............................................................................................197
1.5 PIPING SYSTEM............................................................................................199

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1.1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.1.1 Remote control (Option parts)
(1) Wired remote control
Model RC-EX3A
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④Operation lamp
① Run/Stop switch
② F1 switch③F2 switch
Touch panel system, which is operated by tapping the LCD screen with a finger, is employed
for any operations other than the ①Run/Stop, ②F1 and ③F2 switches.
One push on the button starts operation and
another push stops operation.
This switch starts operation that is set in F1/F2
function change.
This lamp lights in green(yellow-green) during
operation. It changes to red(orange) if any
error occurs.
Operation lamp luminance can be changed.
⑤LCD (with backlight)
A tap on the LCD lights the backlight.
The backlight turns off automatically if there
is no operation for certain period of time.
Lighting period of the backlight lighting can be
changed.
If the backlight is ON setting, when the screen is
tapped while the backlight is turned off,the backlight
only is turned on.(Operations with switches ①,②
and ③are excluded.)
⑥USB port
USB connector (mini-B) allows connecting to a
personal computer.
For operating methods, refer to the instruction
manual attached to the software for personal
computer (remote control utility software).
Note(1) When connecting to a personal computer, do not connect
simultaneously with other USB devices.
Please be sure to connect to the computer directly,without
going through a hub, etc.
Model RC-EX3A
1.10 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.10.1 Remote control
(1) Wired remote control
P044-055.pdf 2017/03/17 13:53:02
⑤LCD (with backlight)
③F2 switch
④Operation lamp
⑥USB port (mini-B)
①Run/Stop switch
②F1 switch

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(1) Wired remote control
Model RC-E5
The figure below shows the remote control with the cover opened. Note that all the items that may be displayed in
the liquid crystal display area are shown in the figure for the sake of explanation
Characters displayed with dots in the liquid crystal display area are abbreviated.
＊ All displays are described in the liguid crystal display for explanation.
The figure below shows the remote control with the cover opened.
Ventilaion display
Displayed during ventilation operation
Central control display
Displayed when the air conditioning system is
controlled by central control.
Timer operation display
Displays the timer operation setting.
Temperature setting buttons
These buttons are used to set the
temperature of the room.
Timer button
This button is used to set
the timer mode.
Timer setting buttons
These buttons are used to set
the timer mode and the time.
ESP button
This button is used to
select the auto static
pressure adjustment mode.
Cover
AIR CON No. button
Display the indoor unit number connected to this
remote control.
CHECK button
This button is used at servicing.
TEST button
This button is used during test operation.
Weekly timer display
Displays the settings of the
weekly timer.
Operation setting display area
Displays setting temperature, air flow
volume, operation mode and oparation
message.
Operation/check indicator light
During oparation: Lit in green
In case of error: Flashing in red
Operation/stop button
This button is used to operate and stop
the air-conditioning system.
Press the button once to operate the
system and press it once again to stop
the system.
MODE button
This button is used to change the
operation mode.
FAN SPEED button
This button is used to set the air flow
volume.
VENT button
This button is used to operate external
ventilator.
LOUVER button
This button is used to operate/stop the
swing louver.
SET button
●This button is used to fix the setting.
●This button is used to set the silent mode.
RESET button
●Press this button while making settings to go back to the
previous operation.
●This button is also used to reset the "FILTER CLEANING" display.
(Press it after cleaning the air filter)
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(2) Wireless remote control
Indication section
Operation section
D
C
4
5
6
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@
B
A
3 7 2
①
OPERATION MODE display Indicates selected operation mode.
②
SET TEMP display Indicates set temperature.
SLEEP TIMER time display Indicates the amount of time remaining on the sleep timer.
Indoor function setting
number display Indicates the setting number of the indoor function setting.
③FAN SPEED display Indicates the selected air ow volume.
④UP/DOWN AIR FLOW
display Indicates the up/down louver position.
⑤LEFT/RIGHT AIR FLOW
display Indicates the left/right louver position.
⑥Clock display Indicates the current time. If the timer is set, the ON
TIMER and OFF TIMER setting times are indicated.
⑦ON/OFF TIMER display Displayed when the timer is set.
⑧ECO mode display Displayed when the energy-saving operation is active.
⑨HI POWER display Displayed when the high power operation is active.
⑩NIGHT SETBACK display Displayed when the home leave mode is active.
⑪SILENT display Displayed when the silent mode control is active.
⑫Motion sensor display Displayed when the infrared sensor control(motion sensor
control) is enabled.
⑬Anti draft setting display Displayed when anti draft setting is enabled.
⑭Child lock display Displayed when child lock is enabled.
Transmitter:Sends signal to the air-
conditioner.
①
⑲
⑤
②
⑫④
③
⑰
⑮
⑨
⑩
⑯
⑪
⑧
⑥
⑭
⑦
⑬
⑱
①ON/OFF button
When this is pressed once, the air-conditioner starts to
operate and when this is pressed once again, it stops
operating.
②MODE button
Every time this button is pressed, displays switch as below
(AUTO) (COOL) (HEAT)
(FAN) (DRY)
③
TEMP button
Change the set temperature by pressing or button.
④FAN SPEED button The fan speed is switched in the following order: 1-speed
➞2-speed ➞3-speed ➞4-speed ➞AUTO ➞1-speed.
⑤U/D button Used to determine the up/down louver position.
⑥ON TIMER button Used to set the ON TIMER.
⑦OFF TIMER button Used to set the OFF TIMER.
⑧SELECT button
Used to switch the time when setting the timer or adjusting the time.
Used to switch the settings of the indoor function.
⑨SET button
Used to determine the setting when setting the timer or
adjusting the time.
Used to determine the settings of the indoor function.
When press and hold SET button ,Child Lock is enabled.
⑩CANCEL button Used to cancel the timer setting.
⑪SLEEP button Used to set the sleep timer.
⑫ECO button Pressing this button starts the energy-saving operation.
Pressing this button again cancels it.
⑬HI POWER button Pressing this button starts the high power operation.
Pressing this button again cancels it.
⑭SILENT button Pressing this button starts the silent mode control.
Pressing this button again cancels it.
⑮NIGHT SETBACK button Pressing this button starts the home leave mode.
Pressing this button again cancels it.
⑯FILTER button Pressing this button resets FILTER SIGN.
⑰
FUNCTION SETTING switch Used to set the indoor function.
⑱TIME SETUP switch Used to set the current time.
⑲ACL switch Used to reset the microcomputer.
(2) Wireless remote control
RCN-E2 ( Except SRK series )
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(2) Wireless remote control
Indication section
Operation section

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OPERATION MODE select button
Each time the button is pressed, the
mode changes.
The above illustration shows all controls, but in
practice only the relevant parts are shown.
ALLERGEN CLEAR button
This button selects ALLERGEN CLEAR
operation.
ON/OFF (luminous) button
Press to start operation, press again
to stop.
TEMPERATURE button
This button sets the room temperature.
AIR FLOW (UP/DOWN) button
This button changes the air flow (up/
down) direction.
TIME SET UP switch
This switch is used for setting the time.
SLEEP button
This button selects SLEEP operation.
MENU switch
This switch selects the brightness
adjustment, AUTO OFF operation, SELF
CLEAN operation and PRESET operation.
ON TIMER button
This button selects ON TIMER operation.
TIMER button
This button is used for setting the
current time and timer function.
ACL switch
This switch resets the program to
default state.
PROGRAM button
This button sets WEEKLY TIMER.
HI/ECO button
This button changes the HIGH POWER/
ECO operation.
AIR FLOW (LEFT/RIGHT) button
This button changes the air flow (left/
right) direction.
SILENT button
This button sets the SILENT operation.
OFF TIMER button
This button selects OFF TIMER
operation.
WEEKLY button
This button switches the WEEKLY
TIMER to ON/OFF.
FAN SPEED button
Each time the button is pressed, the fan
speed changes.
3D AUTO button
This button sets 3D AUTO operation.
NIGHT SETBACK button
This button sets NIGHT SETBACK
operation.
SET/Child lock button
Use this button to set the timer and
Child lock.
CANCEL button
This button cancels the ON timer, OFF
timer, and SLEEP operation.
Transmission section
[View with the cover opened]
SRK series only

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Unit display section
OPERATION MODE select button
ALLERGEN CLEAR 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
AIR FLOW (LEFT/RIGHT) button
SILENT button
OFF TIMER button
WEEKLY button
FAN SPEED button
3D AUTO 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.
This button selects ALLERGEN CLEAR
operation.
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 button changes the air flow (left/right)
direction.
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 3D AUTO operation.
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.
3D AUTO light (green)
Illuminates during 3D AUTO operation.
TIMER light (yellow)
Illuminates during TIMER operation.
This button can be used for turning on/off the unit when
a remote control is not available.
Remote control signal receiver
Unit ON/OFF button
•Illuminates during operation.
•
Blinks when airflow stops due to the ‘HOT
KEEP’
, ‘ CLEAN operation ’ and ‘ operation
mode invalid
’.
ON
OFF
1.5 sec.
0.5 sec.
HOT KEEP
3 sec.
1 sec.
ON
OFF
CLEAN operation
Operation mode
invalid
ON
OFF
0.5 sec.
0.5 sec.
HI POWER light (green)
Illuminates during HIGH POWER operation.
RUN (HOT KEEP) light (green)
This button can be used for turning on/off
the unit when a remote control is not available.
Wireless remote control signal receiver
Unit ON/OFF button
RUN light (green)
•RUN lights blink quickly during invalid operation mode.
•Illuminates during operation.
• Blinks slowly when SELF CLEAN operation (3 seconds ON, 1 second OFF).
• Blinks when airflow is stopped to prevent blowing out of cold
air in heating operation. (1.5 seconds ON, 0.5 seconds OFF)
•Blinks slowly when AUTO OFF operation during stand by
(3.5 seconds ON, 0.5 second OFF).
Unit display section
TIMER light (yellow)
Illuminates during TIMER operation.
(a) Models SRK50ZSX-W, 60ZSX-W
(b) Models SRK71ZR-W, 100ZR-W