Mitsubishi Heavy Industries FDTC40ZSXVH User manual

Manual No.'18 • PAC-SM-297
SERVICE MANUAL
HYPER INVERTER PACKAGED
AIR-CONDITIONERS
(Split system, air to air heat pump type)
CEILING CASSETTE-
4 WAY COMPACT TYPE
FDTC40ZSXVH
50ZSXVH
60ZSXVH
DUCT CONNECTED-LOW/
MIDDLE STATIC PRESSURE TYPE
FDUM40ZSXVH
50ZSXVH
60ZSXVH
FDE40ZSXVH
50ZSXVH
60ZSXVH
CEILING SUSPENDED
TYPE

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CONTENTS
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER …………… 3
1.1 Remote control ………………………………………………………………… 3
1.2 Operation control function by the wired remote control ……………… 5
1.3 Operation control function by the indoor control ……………………… 8
(1) Auto operation ……………………………………………………………… 8
(2) Operations of functional items during cooling/heating …………………… 9
(3) Dehumidifying (DRY) operation …………………………………………… 9
(4) Timer operation …………………………………………………………… 10
(5) Hot start (Cold draft prevention at heating) …………………………… 11
(6) Hot keep …………………………………………………………………… 12
(7) Auto swing control (FDTC, FDE only)…………………………………… 12
(8) Thermostat operation …………………………………………………… 13
(9) Filter sign…………………………………………………………………… 14
(10) Compressor inching prevention control ………………………………… 14
(11) Drain pump control………………………………………………………… 15
(12) Drain pump motor (DM) control ………………………………………… 15
(13) Operation check/drain pump test run operation mode………………… 15
(14) Cooling, dehumidifying frost protection ………………………………… 16
(15) Heating overload protection ……………………………………………… 16
(16) Anomalous fan motor …………………………………………………… 16
(17)
Plural unit control - Control of 16 units group by one remote control ……… 17
(18) High ceiling control ……………………………………………………… 17
(19)
Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection … 18
(20) External input/output control (CnT or CnTA) …………………………… 18
(21) Operation permission/prohibition………………………………………… 20
(22) Temporary stop input……………………………………………………… 22
(23) Selection of cooling/heating external input function …………………… 22
(24) Fan control at heating startup …………………………………………… 23
(25)
Room temperature detection temperature compensation during heating ……… 23
(26) Return air temperature compensation ………………………………… 23
(27) High power operation (RC-EX3A only) ………………………………… 23
(28) Energy-saving operation (RC-EX3A only) ……………………………… 23
(29) Warm-up control (RC-EX3A only) ……………………………………… 23
(30) Home leave mode (RC-EX3A only) …………………………………… 23
(31) Auto temperature setting (RC-EX3A only) ……………………………… 23
(32) Fan circulator operation (RC-EX3A only) ……………………………… 24
(33)
The operation judgment is executed every 5 minutes (RC-EX3 A only) … 24
(34) Auto fan speed control (RC-EX3A only) ………………………………… 24

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(35) Indoor unit overload alarm (RC-EX3A only) …………………………… 24
(36) Peak-cut timer (RC-EX3A only) ………………………………………… 24
(37) Motion sensor control (RC-EX3A only) ………………………………… 24
1.4 Operation control function by the outdoor control ………………… 26
(1) Defrost operation ………………………………………………………… 26
(2) Cooling overload protective control……………………………………… 26
(3) Cooling high pressure control …………………………………………… 27
(4) Cooling low outdoor air temperature protective control ……………… 27
(5) Heating high pressure control …………………………………………… 28
(6) Heating overload protective control …………………………………… 28
(7) Heating low outdoor temperature protective control ………………… 29
(8) Compressor overheat protection ………………………………………… 29
(9) Current safe ……………………………………………………………… 30
(10) Current cut ………………………………………………………………… 30
(11) Outdoor unit failure………………………………………………………… 30
(12) Serial signal transmission error protection……………………………… 30
(13) Rotor lock ………………………………………………………………… 30
(14) Outdoor fan motor protection …………………………………………… 30
(15) Outdoor fan control at low outdoor temperature ……………………… 30
(16) Refrigeration cycle system protection…………………………………… 31
2. MAINTENANCE DATA ………………………………………………………… 32
2.1 Diagnosing of microcomputer circuit …………………………………… 32
(1) Selfdiagnosis function …………………………………………………… 32
(2) Troubleshooting procedure ……………………………………………… 35
(3) Troubleshooting at the indoor unit ……………………………………… 35
(4) Troubleshooting at the outdoor unit …………………………………… 40
(5) Check of anomalous operation data with the remote control ………… 41
(6) Inverter checker for diagnosis of inverter output ……………………… 43
(7) Outdoor unit control failure diagnosis circuit diagram ………………… 44
2.2 Troubleshooting ow ……………………………………………………… 46
(1) List of troubles …………………………………………………………… 46
(2) Troubleshooting …………………………………………………………… 47
3. ELECTRICAL WIRING ………………………………………………………… 89
(1) Indoor units ………………………………………………………………… 89
(2) Outdoor units ……………………………………………………………… 93
4. PIPING SYSTEM ………………………………………………………………… 94

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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.
④Operation lamp
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
⑤ LCD (with backlight)
③F2 switch
④Operation lamp
⑥USB port (mini-B)
①Run/Stop switch
②F1 switch
1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER
1.1 Remote control (Option parts)
(1) Wired remote control
Model RC-EX3A

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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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Model RC-E5

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1.2 Operation control function by the wired remote control
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Service & Maintenance
Special settings
Indoor unit capacity display
Back
Select the item.
前ページ
Previous Back
Erase IU address
CPU reset
Restore of default setting
Touch panel calibration
Special settings
Select the item.
R/C function settings
Ventilation setting
Auto-restart
Auto temp setting
Back
Select the item.
Previous
Auto fan speed
② Auto-restart
Auto-restart
Back
Select the item.
Enable
Disable
1.10.2 Operation control function by the wired remote control
●Model RC-EX3A
(1) Switching sequence of the operation mode switches of remote control
(a) Tap the change operation mode button on the TOP screen.
(b) When the change operation mode screen is displayed, tap the button of desired mode.
(c) When the operation mode is selected, the display returns to the TOP screen.
Icons displayed have the following meanings.
Notes (1) Operation modes whichcannot be selected depending on combinations of indoor
unit and outdoor unit are not displayed.
(2) When the Auto is selected,the cooling and heating switching operation is performed
automatically according to indoor and outdoor temperatures.
(2) CPU reset
Reset CPU from the remote control as follows.
TOP screen Menu Service setting Service & Maintenance Service password
The selected screen is
displayed.
The selected screen is
displayed.
① Service & Maintenance #2 ②Special settings
⇒ ⇒ ⇒
CPU reset
Microcomputers of indoor unit and outdoor unit connected are reset
(State of restoration after power failure).
(3) Power failure compensation function (Electric power source failure)
Enable the Auto-restart function from the remote control as follows.
TOP screen Menu ⇒ Service setting ⇒ R/C function settings Service password
⇒
① R/C function settings menu #3
If the unit stops during operation,
It returns to the state before the power failure as soon as the power
source is restored (After the end of the primary control at the power
on).
It stops after the restoration of power source.
Enable
Disable
●Since the status of remote control is retained in memory always, it restarts operations according to the contents of memory
as soon as the power source is restored. Although the timer mode is cancelled, the weeklytimer, peakcut timerand silent
mode timer operate according to the following contents:
・When the clock setting is valid : These timer settings are also valid.
・When the clock setting is invalid : These timer settings become “Invalid” since the clock setting is invalid.
These timer settings have to be changed to “Valid” after the timer setting.
Cooling Fan
Dry Heating
Auto

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Clock setting check screen
Misconnection screen
●Content memorized with the power failure compensation are as follows.
Note(1) Items (f) and (g) are memorized regardless whether the power failure compensation is effective or not while the setting of silent mode is cancelled
regardless whether the power failure compensation is effective or not.
(a) At power failure – Operating/stopped
If it had been operating under the off timer mode, sleep timer mode, the state of stop is memorized.
(b) Operation mode
(c) Air flow volume mode
(d) Room temperature setting
(e) Louver auto swing/stop
However, the stop position (4-position) is cancelled so that it returns to Position (1).
(f) “Remote control function items” which have been set with the administrator or installation function settings
(“Indoor function items” are saved in the memory of indoor unit.)
(g) Weekly timer, peak-cut timer or silent mode timer settings
(h) Remote control function setting
Please check the I/U
Set clock first on the initializing
screen & set the timer.
Other than A/C is connected
(4) Alert displays
If the following (a) to (c) appear, check and repair as follows.
Communication check screen ●This appears if communications cannot be established between the remote
control and the indoor unit.
Check whether the system is correctly connected (indoor unit, outdoor unit,
remote control) and whether the power source for the outdoor unit is connected.
●This appears when the timer settings are done without clock setting.
Set the clock setting before the timer settings.
●This appears when something other than the air-conditioner has been connected to the remote
control.
Check the location to which the remote control is connected.
(a) Communication check between indoor unit and remote control
(b) Clock setting check
(c ) Misconnection

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●
Model RC-E5
(1) Switching sequence of the operation mode switches of remote control
DRY COOL FAN HEAT AUTO
(2) CPU reset
This functions when “CHECK” and “ESP” buttons on the remote control are pressed simultaneously. Operation is same as
that of the power source reset.
(3) Power failure compensation function (Electric power source failure)
• This becomes effective if “Power failure compensation effective” is selected with the setting of remote control function.
• Since it memorizes always the condition of remote control, it starts operation according to the contents of memory no
sooner than normal state is recovered after the power failure. Although the auto swing stop position and the timer mode
are cancelled, the weekly timer setting is restored with the holiday setting for all weekdays.
After recovering from the power failure, it readjusts the clock and resets the holiday setting for each weekday so that
the setting of weekly timer becomes effective.
• Content memorized with the power failure compensation are as follows.
Note (1) Items (f), (g) and (h) are memorized regardless whether the power failure compensation is effective or not while the setting of silent mode is
cancelled regardless whether the power failure compensation is effective or not.
(a) At power failure – Operating/stopped
If it had been operating under the off timer mode, sleep timer mode, the state of stop is memorized. (Although
the timer mode is cancelled at the recovery from power failure, the setting of weekly timer is changed to the
holiday setting for all weekdays.)
(b) Operation mode
(c) Airowvolumemode
(d) Room temperature setting
(e) Louver auto swing/stop
However, the stop position (4-position) is cancelled so that it returns to Position (1).
(f) “Remote control function items” which have been set with the remote control function setting (“Indoor
function items” are saved in the memory of indoor unit.)
(g) Upper limit value and lower limit value which have been set with the temperature setting control
(h) Sleep timer and weekly timer settings (Other timer settings are not memorized.)
[Parts layout on remote control PCB]
Master/ slave setting when more than one remote controls are used
A maximum of two remote controls can be connected to one indoor unit (or one group of indoor units.)
Remote control cord (no polarity)
Remote control
SW1 "Master"
Switch Setting Contents
M Master remote control
SW1 S Slave remote control
Remote control
SW1 "Slave"
Indoor units
Note (1) Don’t change SW2 because it is not used normally.
Caution
When using multiple remote controls, the following dispiays or settings
cannot be done with the slave remote control. It is available only with
the master remote control.
Louver position setting (set upper or lower limit of swinging range)
Setting indoor unit functions
Setting temperature range
Operation data display
Error data display
Silent mode setting
Test operation of drain pump
Remote control sensor setting
XY
SW2
SW1
A
B
M
S
親
子
SW1
SW2

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1.3 Operation control function by the indoor control
(1) Auto operation
(a) If “Auto” mode is selected by the remote control, the heating and the cooling are automatically switched according to the
difference between outdoor air temperature and setting temperature and the difference between setting temperature and
return air temperature. (When the switching of cooling mode ↔heating mode takes place within 3 minutes, the compressor
does not operate for 3 minutes by the control of
3-minute timer.) This will facilitate the cooling/heating switching operation
in intermediate seasons and the adaptation to unmanned operation at stores, etc (ATM corner of bank).
Notes (1) Temperature range of switching cooling/heating mode can be changed by RC-EX3 from ±1.0 - ±4.0.
(2) Room temperature control during auto cooling/auto heating is performed
according to the room temperature setting temperature. (DIFF: ±1 deg)
(3) If the indoor heat exchanger temperature rises to 59°C or higher during
heating operation, it is switched automatically to cooling operation. In
addition, for 1 hour after this switching, the heating operation is not
performed, regardless of the temperature shown at right.
+3-3
Cooling operation
Heating operation
Room temperature (detected with Thi-A) [deg]
5956
Heating operation stopped (cooling)
Heating OK
Indoor heat exchanger temperature (°C)
(b) The following automatic controls are performed other than (a) above.
(i) Cooling or heating operation mode is judged according to the conditions of the "Judgment based on Setting temperature +
Cooling select temperature and Indoor return air temperature" and the "Judgment based on Outdoor temperature".
1)  In "Setting temperature - Cooling select temperature < Indoor return air temperature" and "Outdoor temperature/Cooling <
Outdoor return air temperature" ⇒Operation mode: Cooling
2)  "Setting temperature + Heating select temperature > Indoor return air temperature" and "Outdoor temperature/
Heating > Outdoor air temperature" ⇒Operation mode: Heating
3) The outdoor air temperature of the above judgment conditions is sampled at every 10 minutes.
4) In the range where the above cooling and heating zones are overlapped ⇒Forced thermostat OFF
Indoor return air temperature (℃)
Outdoor air temperature (℃)
24 2612 14 16 18 28 3020 22
12
26
24
22
20
18
16
14
30
28
Heating
Cooling
Forced thermostat OFF
Forced thermostat
OFF
Forced
thermostat OFF
Outdoor temperature/Heating
Outdoor temperature/Cooling
Cooling select temperature Heating select temperature
Setting temperature

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(ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment
based on Room temperature/Cooling or Heating and Outdoor temperature/Cooling or Heating".
1)  In case of "Room temperature/Cooling < Indoor return air temperature" and "Outdoor temperature/Cooling < Out-
door air temperature" ⇒Operation mode: Cooling
2)  In case of "Room temperature/Heating > Indoor return air temperature" and "Outdoor temperature /Heating > Out-
door air temperature" ⇒Operation mode: Heating
3) The outdoor air temperature of the above judgment conditions is sampled at every 10 minutes.
4) In the range where the above cooling and heating zones are overlapped ⇒Forced thermostat OFF
Forced thermostat
OFF
Forced thermostat
OFF
Room temperature/Cooling Room temperature/Heating
Outdoor air temperature (℃)
Indoor return air temperature (℃)
Outdoor temperature/Heating
Outdoor temperature/Cooling
12
26
24
22
20
18
16
14
30
28
24 2612 14 16 18 28 3020 22
Forced thermostat OFF Cooling
Heating
(2) Operations of functional items during cooling/heating
Cooling Heating
Dehumidifying
Fan
Operation
Functional item
Thermostat
ON
Thermostat
ON
Thermostat
OFF
Thermostat
OFF
Hot start
(Defrost)
Compressor
4-way valve
Outdoor unit fan
Indoor unit fan
Drain pump (3)









(2)




(2)




/ 




/ 

()
()

/ 
/

/
/
Thermostat ON: 
Thermostat OFF: (2)
/(2)
Notes
(1) :Operation : Stop /: Turned ON/OFF by the control other than the room temperature control.
(2) ON during the drain pump motor delay control.
(3) Drain pump ON setting may be selected with the indoor unit function setting of the wired remote control.
(ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment based on
Room temperature/Cooling or Heating and Outdoor temperature/Cooling or Heating".
1)
In case of "Room temperature/Cooling < Indoor return air temperature" and "Outdoor temperature/Cooling < Outdoor air tem
perature" ⇒Operation mode: Cooling
2)
In case of "Room temperature/Heating > Indoor return air temperature" and "Outdoor temperature /Heating > Outdoor air tem
perature" ⇒Operation mode: Heating
3) The outdoor air temperature of the above judgment conditions is sampled at every 10 minutes.
4) In the range where the above cooling and heating zones are overlapped ⇒Forced thermostat OFF
Forced thermostat
OFF
Forced thermostat
OFF
Room temperature/Cooling Room temperature/Heating
Outdoor air temperature (℃)
Indoor return air temperature (℃)
Outdoor temperature/Heating
Outdoor temperature/Cooling
12
26
24
22
20
18
16
14
30
28
24 2612 14 16 18 28 3020 22
Forced thermostat OFF Cooling
Heating
(2) Operations of functional items during cooling/heating
Cooling Heating
Dehumidifying
Fan
Operation
Functional item
Thermostat
ON
Thermostat
ON
Thermostat
OFF
Thermostat
OFF
Hot start
(Defrost)
Compressor
4-way valve
Outdoor unit fan
Indoor unit fan
Drain pump (3) (2) (2)
/ /
( )
( )
/
/
/
/
Thermostat ON:
Thermostat OFF: (2)
/(2)
Notes (1) :Operation : Stop /: Turned ON/OFF by the control other than the room temperature control.
(2) ON during the drain pump motor delay control.
(3) Drain pump ON setting may be selected with the indoor unit function setting of the wired remote control.
(3) Dehumidifying (DRY) operation
(a) FDTC series
(i)
(ii)
(iii)
(iv)
Indoor ambient temperatures and humidity are controlled simultaneously with the relative humidity sensor (HS) and the
suction temperature sensor [Thi-A (or the remote control sensor when it is activated)], which are installed at the suction inlet.
When the operation has been started with cooling, if there is a difference of 2 °C or less between the suction and setting
temperatures, the tap of indoor fan is lowered by one tap. This tap is retained for 3 minutes after changing the tap.
After the above condition, when a difference between suction and setting temperature is lower than 3°C, and the
relative humidity is high, the tap of indoor unit fan is lowered by one tap.
When the difference between suction and setting temperature is larger than 3°C, the fan of indoor unit fan is raised by
one tap. This tap is retained for 3 minutes after changing the tap.
When relative humidity becomes lower, the indoor unit fan tap is retained.
In case of the thermostat OFF, the indoor unit fan tap at the thermostat ON is retained.