Toshiba TCB-SC643TLE User manual

Central remote controller
Model name:
TCB-SC643TLE
TCB-SC643TLE-TR
TCB-SC643TLE-ME
Service Manual
FILE No. A10-1828

2
Contents
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1 Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Function List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Product specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Power, signal and earth line connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 How to install . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Centralized controller test run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 Obtain Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9 Zone settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10 Communication Conf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
11 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12 Check Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
13 Confirming the software version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3
Safety Precautions
•This section explains safety precautions you must follow in order to prevent harm to the user and other persons and damage
to property.
• "Display Description" explains the classification of the degree of harm or damage that may occur if the unit is handled
incorrectly, while "Symbol Description" indicates the meanings of symbols.
Display Description Symbol Description
WARNING
Indicates "Content that is expected to
result in death or serious injury (*1) to
the user in the case of incorrect
handling".
indicates prohibited actions. Specifically
prohibited contents are indicated with a picture
and/or text in or near the symbol.
CAUTION
Indicates "Content that is expected to
result in minor injury (*2) to the user or
damage to property (*3) in the case of
incorrect handling".
indicates instructions which must be followed.
The actual contents of the instructions are
indicated with a picture and/or text in or near the
symbol.
* 1: Serious injury refers to lasting after effects such as blindness, injury, burns (high temperature / low temperature), electric shock, bone
fracture, or poisoning, etc. and injuries that require hospitalization/long-term outpatient treatment.
* 2: Minor injury refers to injuries, burns, or electric shocks, etc. that do not require hospitalization or long-term outpatient treatment.
* 3: Damage to property refers to extended damage related to houses, household goods, livestock, or pets, etc.
DANGER
• Set the circuit-breaker to "OFF" before starting work
Failing to do so may result in a high-voltage electric shock, leading to death or injury.
• Do not turn on the circuit-breaker when the cover is removed
Doing so may result in a high-voltage electric shock leading to death or injury.
WARNING
• Check that the earth wire (*) is connected to the unit earth terminal before
beginning troubleshooting and repair work
If the earth wire is not connected, there is the risk of electric shock in the event of an electric
leakage occurring.
• Do not modify the product
Also, do not disassemble or modify the parts.
Doing so may cause fire, electric shock, or injury.
• Only qualified engineers should be allowed on a troubleshooting or repair work
site. Children and all other third parties must be kept away
There is a risk of injury from tools or disassembled parts.
Inform the customer that children and other third parties must be kept away from the work site.
• After connecting a crimp terminal to a cut lead wire, place the closed-end facing
up and clean it
If connections are not properly processed, electrical leakage, ignition or other accident could
occur on the customer’s premises.
• After repairs are complete, be sure to reassemble the disassembled parts and
connect and route the wires to restore the equipment to its original state. Make
sure internal wires are not trapped in the cabinets, panels, or other parts
An assembly or wire connection problem may result in a short circuit, ignition or other accident on
the customer's premises.
Turning off the
circuit-breaker
Prohibited
Check earth connection
Modification prohibited
Children must be kept
away
Insulation
Wiring Precautions
During Assembly

4
• After the work is completed, be sure to test between the live and dead metal parts
(earth terminal) with an insulation resistance tester (500 V) to confirm that the
insulation resistance is 2 MΩ or higher
A low insulation resistance value may result in a short circuit, electric shock or other accident on
the customer's premises.
• If you have to inspect a circuit that is energized, for example, take precautions
such as wearing rubber gloves to avoid direct contact with a live part
Touching a live part may result in an electric shock.
• Check that there are no abnormalities after completing the repair work
Failure to perform this check may result in fire, electric shock, or injury.
Turn off the earth leakage breaker before performing an inspection.
• After completing the repair work, perform a test run and check that there are no
abnormalities such as smoke or unusual noise
Failure to perform this check may result in fire or electric shock.
Perform a test run after installing the front panel and cabinets.
• Installation and reinstallation work should be performed by your vendor or a
qualified electrician
Attempting to carry out installation work on your own, and doing so incorrectly, may result in
electric shock or fire.
Insulation check
Risk of electric shock
Check after repair
Repair and reinstallation
work

5
1Product Overview
This is an air conditioning control system for controlling and monitoring the operating conditions of air conditioners in a building.
A single controller can control up to 64 indoor units in one to 10 zones that can be individually controlled and monitored. You
can combine this system with a schedule timer to perform program operation of indoor units.
1-1. Key Features
Ventilation Setting Functions
You can control (start/stop ventilation, set ventilation mode or set ventilation fan speed) all linked heat exchange units.
Timer Operation Functions
You can use timer operation to set the time until operation stops or starts as required by the range of the area to be air
conditioned.
Energy Save Mode Functions
You can save energy by setting 0%, 50% or Max. (%) as required by the range of the area to be air conditioned.
Remote Control Lock Functions
You can restrict button operation of the remote controls connected to each air conditioner as required by the set area range.
Device Information Display Functions
The machine’s model No. and version information can be displayed.
Setting Items
Functions that can be operated with the remote control
ON/OFF Change Operation
Mode
Change
Temperature
All allowed ○○○
Centralized Control 1 ×○○
Centralized Control 2 ×××
Centralized Control 3 ○××
Centralized Control 4 ○×○

6
2System Configuration
System Equipment Configuration Table
2-1. Communication Specifications
Equipment name Model name Number of connected
units Remarks
Indoor unit (Model with TCC-LINK) Max. 64 Max. 64 units
Weekly timer TCB-EXS21TL Max. 1 Use the supplied cable to connect
TCC-LINK
Topology Bus
Transmission medium MVVS-1.25 mm2/2.00 mm2
Transmission distance Max. 1,000 m for 1.25 mm2 (AWG16) (total extended length)
Max. 2,000 m for 2.00 mm2 (AWG14)
Number of nodes Max. 100
(Outdoor and indoor units)
Transmission rate 9.6 kbps
Polarity No
Weekly timer
TCC-LINK
Outdoor unit
Indoor unit
Central remote controller
Alarm output
Operation output
All start
All stop

7
3Function List
Functions Description
Display item
ON or OFF ○
Operation Mode ○
Set Temperature ○
Fan speed ○
Flap ○
FILTER Sign ○
Room temperature ○
Ventilation Operation ○
Ventilation Mode ○
Ventilation fan speed ○
Alarm ○
Save ○
Alarm history ○ (300 instances, displayed in the order they occur, no time
data)
Contact information ○
Operation item
ON or OFF ○
Operation Mode ○
Set Temperature ○
Fan speed ○
Flap ○
Remote Control Lock ○
Ventilation Operation ○
Ventilation Mode ○
Ventilation fan speed ○
Filter Reset ○
Save ○
Timer On Timer ○
Off Timer ○
Optional settings Setting passwords ○
Communication Conf. ○
External I/O
All start input ○
All stop input ○
Alarm output ○
Operation output ○ (contact output when more than one unit is on)

8
4Product specifications
TCB-SC643TLE Central remote controller
120
84
46
88
100
120
68.4
68.4 83.5
100
77
20 50.6
70.6
Φ3.5 Φ4.5×6.5
Power supply 220 - 240 V AC, 50/60 Hz
Current
consumption 0.06 A
Operating
temperature/
humidity
range
0 to 40 C°, 10 to 90% RH
(no condensation)
External
dimensions 120 (H) x 120 (W) x 70.6 (D) mm
Mass 0.55 kg

9
5Power, signal and earth line connections
(1) Remove the 3 screws pointed to by arrows and open the cover
(2) Insert cross notches in the rubber bushing in order to pass the power supply cable
(3) Pass the power supply cable through the rubber bushing and the clamp, and connect the power supply wire and
the ground wire to the specified terminal block
(4) Close the power supply cover and secure with 3 screws
(1) Connect the TCC-LINK signal wire (U1/U2) to the terminal block
When connecting with an optional weekly timer, connect it to the WT connector.
Connect the power supply wire to the ground wire
Connect the signal wires
Cover fixing screw Screws indicated by
arrows
Cover fixing screw
Power supply cover
Rear side
terminal block
Power terminal
Power supply wire
Clamp
Ground wire
Ground terminal
Rubber bushing
(Remove the transparent
cover at installation and
return it to its original
position after connecting)
(18)
(5)
WT
−
L N COM
DI3
DI2
DI1
COM
DO2
DO1
U1
U2
Weekly Timer
(sold separately)
TCC-LINK main bus
Outdoor unit
Indoor unit
Remote controller
Power supply: 220-240 VAC
Securely fix the cable with
a clamp.

10
(2) Connect to external equipment (digital I/O signal wire)
About stripping length
Power supply wire stripping
length
Signal wire (TCC-LINK) stripping
length
Digital I/O cable stripping length
Attach a round crimp terminal to each
wire of the power supply wire.
About the shield grounding
process
Shield of TCC-LINK communication
line
When using a single Central remote
controller, open the shield of the
TCC-LINK communication line and
perform insulation processing.
When using multiple Central remote
controller, connect the shield of the
TCC-LINK communication line to the
closed end, open the shield at the final
end of the Central remote controller and
perform insulation processing.
Perform TCC-LINK communication line
shield grounding on the air conditioner
side.
About terminator resistor
setting
TCC-LINK terminator resistor setting
Set on the air conditioner side. The
TCC-LINK terminator resistor is not set
in the Central remote controller. Leave
"open".
—
COM
DI3
DI2
DI1
COM
DO2
DO1
U1
U2
Input common
Not used
All start input
All stop input
Control input
Output common
Operation
output
Alarm output
State output
N
L
30
70
15 10
35
20 10
Round crimp
terminal
Power supply wire

11
Connection to external equipment
* Wire the cables so that the user does not touch the power supply directly.
* On the equipment side, use a basically insulated power circuit and place it in a location where the user cannot touch it.
NOTE
• Do not connect the device directly to the primary side of the power supply.
Be sure to install a circuit breaker or all-pole isolating switch (with a contact breaking distance of at least 3 mm) on the
primary side of the power supply.
• Fasten the screws to the terminal with torque of 0.5 N•m.
Name I/O Item This unit side Equipment side
I/O conditions Circuit Terminal name Circuit example I/O conditions
Digital
I/O terminal
State
output
Alarm output
Run output
No-voltage contact A
Static
Contact permissible
voltage/current
24 VDC/35 mA
Control
input
All stop input
All start input
No-voltage contact A
Pulse or static
No-voltage contact
compatible with very
small current must be
selected
5 VDC/3 mA
Pulse width:
300 ms or
more
Alarm
Run
Output common
Digital Input
All start (+)
(Pulse or static)
5 V
All stop (+)
Input common (-)
COM
(Pulse or static)
5 V

12
6How to install
CAUTION
• Do not wire communication lines (outdoor/indoor transition wiring, central control line wiring) or input/output wiring next to
power supply wiring, etc., or house them in the same metal pipe. Doing so may result in failure.
• Install the Central remote controller away from noise sources.
• If noise is induced in the unit power supply, measures such as attaching a noise filter are necessary.
(1) Remove one operating part panel fixing screw and open the operating part panel
(2) Attach the lower case to the JIS box embedded in the wall in advance with the four included fixing screws
(3) Close the operating part panel and attach it with one operation part panel fixing screw
NOTE
When attaching to a metal lath, wire lath or metal board wooden structure, attach it to the control panel, etc. without attaching
it to the wall.
Do not install in the following locations.
• Locations with high humidity or water
• Dusty locations
• Locations in direct sunlight and locations subject to high temperatures
• Locations within 1 m from televisions or radios
• Outdoors, under awnings, or other locations exposed to rain and dew
Operation panel
Included fixing screws
Operation panel fixing screw
Lower case
Included fixing screws
JIS box
• JISC8340
Switch box for two pieces
(With cover)

13
7Centralized controller test run
• Before use, please follow the procedure below to configure the settings.
This makes it possible to monitor and operate air conditioners with the Unit.
1Turn on the power of all air conditioners
• Indoor unit, outdoor unit, air to air heat exchanger, general-purpose equipment control interface, etc.
2Turn on the power of the centralized controller
• It is necessary to allocate a central control address to the indoor units to be controlled.
<Preparation for central control address setting>
• A centralized controller or a wired remote controller is required to set the central control address.
• Configure the central control address setting after completing the air conditioner test run.
* When configuring various settings with the centralized controller, it is necessary to first complete initial communication
with all connected indoor/outdoor units. Perform the setting work at least 10 minutes after turning on the power.
NOTE
If you configure the central control address setting before initial communication is fully completed, units with no set address will
be generated.
• Connect the U1 and U2 terminals in the outdoor unit (center unit) and the relay connectors of the U3 and U4 terminals.
• Leave only one SW30 - 2 (terminator resistor) in the outdoor unit (center unit) interface board ON, and turn OFF all others.
(For the position of SW30, refer to the wiring diagram attached to the outdoor unit.)
"All" screen example
Run lamp
Inspection lamp
ON button
OFF button
(Control) button
(Menu) button
(Confirm) button
(Return) button
Button
All Zone Unit
ON
OFF
FILTER
Units
Zone Control

14
3Register an indoor unit in the Unit
On the "All" screen, press the [ ] button and the [ ] button at the same
time for 4 seconds or more to enter "Servicing Menu".
Perform "Obtain Address (P.15-8-(1) to (3))" of "Address Settings". After
performing "Obtain Address (P.15-8-(3))", check whether there are any
mistakes in the displayed number of connected units, the Outdoor line No.-
indoor address, or the central control address (*1) and then perform "Obtain
Address (P.15-8-(6))".
*1 If there is a mistake
• Check the power supply and wiring.
• To change the address, use the remote controller or the Unit (P.15-8-
(4) to (5)).
• Redo the settings in this section (3.Register an indoor unit in the Unit)
from the beginning.
4 Allocate the indoor units registered in 3 to up to 10 zones
Perform "Zone Settings (P.16-9-(2) to (4))" of "Servicing Menu".
Return to the "All" screen and check whether the displayed number of units
matches the number of units that were registered to the zones (*2).
*2 Indoor units that have not been registered to a zone are not included in the
number of units on the "All" screen.
5Operation confirmation
Confirm that the indoor units operate from the centralized controller.
Also, check whether the operation of the local remote control is reflected in the
centralized controller.
This completes the test run of the controller.
For other detailed settings, please refer to "Installation Manual" as necessary.
01-01
02-01
02-04
03-03
04-01
01-02
02-02
03-01
03-04
04-02
01-03
02-03
03-02
03-05
04-03
1
4
7
10
13
3
6
9
12
15
2
5
8
11
14
Line address Indoor address
Central control address
Example of the Obtain Address screen
ConfirmAddress Settings (1/1)
01-01
02-01
02-04
03-03
04-01
01-02
02-02
03-01
03-04
04-02
01-03
02-03
03-02
03-05
04-03
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Zone No.
Example of the Zone Settings screen
Confirm
Zone Settings (1/1)

15
8Obtain Address
(1) Display the "Address Settings" screen
(2) Press [˄] and [˅] to select "1. Obtain Address",
then press [ ] (Confirm)
The "Obtain Address" confirmation screen appears.
(3) Press [˄] and [˅] to select "Yes", then press [ ]
(Confirm)
"Obtaining address... " appears, and the "List of
equipment" screen appears when address acquisition is
completed.
Acquiring an address may take several minutes.
• Select "No" and press [ ] (Confirm) to return to the
"Servicing Menu" screen.
• Press [ ] (Return) to return to the "Servicing Menu"
screen.
(4) Press [<] [˄] [˅] [>] to select a piece of equipment,
then press [ ] (Confirm)
The "Address list" screen appears.
• In the screen, black is "cursor" and grey is "assigned
address".
(5) Press [<] [˄] [˅] [>] to select an address, then press
[ ] (Confirm)
The "Address list" screen closes and the "List of
equipment" screen appears.
(6) To confirm the displayed address, press [ ]
(Return)
The confirmation screen appears.
(7) Press [˄] and [˅] to select "Yes", then press [ ]
(Confirm)
"Registering the address... " appears, and when
address registration is completed, the "List of equipment"
screen appears.
• If you select "No" and press [ ] (Confirm), the display
returns to the "Servicing Menu" screen without
registering the address.
(8) Confirm that the set address has been changed,
then press [ ] (Return)
(9) Press [˄] and [˅] to select "Yes", then press [ ]
(Confirm)
This machine restarts and address acquisition ends.
Associated functions
Address acquisition method switching
• When connecting custom device to a 29 to 30 system,
set SW24-7 of “Communication Conf. (P17)” to “0”,
and switch the address acquisition method to
“Complete Search of 29 to 31 Outdoor line Indoor unit
Only” to acquire the address.
• When connecting custom-designed equipment to a 1
to 30 system, set SW24-7 of “Communication Conf.
(P17)” to “1”, and switch the address acquisition
method to “Complete Search of All Systems Indoor
Equipment” to acquire the address.
* It may take about 20 minutes when setting SW24-7
to “1” to acquire an address.
Auto registration in zones
• When acquiring an address at initial start-up, the
connected air conditioners will all automatically
register in zone 1.
• If you are acquiring an address when the zone setting
of all air conditioners is still not set, the connected air
conditioners will all automatically be registered to zone
1.
NOTE
It cannot be operated normally when the address is changed
with a Local remote control or when the wrong centralized
control address is registered to a centralized controller. Re-
acquire the address.
01-01
02-01
02-04
03-03
04-01
01-02
02-02
03-01
03-04
04-02
01-03
02-03
03-02
03-05
04-03
1
10
31
ConfirmAddress Settings (1/1)
01-01
02-01
02-04
03-03
04-01
01-02
02-02
03-01
03-04
04-02
01-03
02-03
03-02
03-05
04-03
1
10
19
28
37
2
11
20
29
38
3
12
21
30
39
4
13
22
31
40
5
14
23
32
41
6
15
24
33
42
7
16
25
34
43
8
17
26
35
44
9
18
27
36
45
01-01
Confirm
Confirm
this address?
Yes
No

16
9Zone settings
(1) Display the "Servicing Menu" screen
(2) Press [˄] and [˅] to select "2. Zone Settings", then
press [ ] (Confirm)
The "List of equipment" screen appears.
(3) Press [<] [˄] [˅] [>] to select a piece of equipment,
then press [ ] (Confirm)
The "Zone list" screen appears.
(4) Press [<] [˄] [˅] [>] to select a zone, then press [ ]
(Confirm)
The zone is set and the display returns to the "List of
equipment" screen.
• The registered zone is deleted by selecting "Del" with
[˅] and pressing [ ] (OK).
• Press [ ] (Return) to return to the "Servicing Menu"
screen.
Procedure for deleting all zones
(1) Display the "Servicing Menu" screen
(2) Press [˄] and [˅] to select "2. Zone Settings", then
press [ ] (Confirm)
The "List of equipment" screen appears.
(3) From the “List of Equipment” screen, press and hold
[˄][˅] and [ ] simultaneously for at least 4 seconds.
The "Delete zone setting" confirmation screen appears.
(4) Press [˄] and [˅] to select "Yes", then press [ ]
(Confirm)
• "It has been deleted." is displayed, and when you
press [ ] (Return), you will return to the "List of
Equipment" screen.
01-01
02-01
02-04
03-03
04-01
01-02
02-02
03-01
03-04
04-02
01-03
02-03
03-02
03-05
04-03
1
10
1
1
2
ConfirmZone Settings (1/1)
01-01
02-01
02-04
03-03
04-01
01-02
02-02
03-01
03-04
04-02
01-03
02-03
03-02
03-05
04-03
1
10
1
1
2
01-01 01
12345
678910
ConfirmZone Settings (1/1)
Confirm
Del
01-01
02-01
02-04
03-03
04-01
01-02
02-02
03-01
03-04
04-02
01-03
02-03
03-02
03-05
04-03
1
10
1
1
2
ConfirmZone Settings (1/1)
Delete all.
Is it OK?
Yes
No
Delete zone setting

17
10 Communication Conf.
(1) Display the "Communication Conf." screen
The "Communication Conf." screen appears.
(2) Press [<] [˄] [˅] [>] to select the SW number, then press [<] [˄] [˅] [>] to set SW
• Press [˄] and [˅] to change the number.
(3) Press [ ] (Confirm)
The data is confirmed and the display returns to the "Servicing Menu" screen.
NOTE
See the table on the next page for Communication Conf. details.
SW23
No 1234 5678
SW23 0000 0000
SW24 0000 0000
SW25 0010 0000
0: 1:
Controlled unit number mode switching
(2)(3)(4)(5)
0000 = All groups
1000 = Groups 1 to 16
0100 = Groups 17 to 32
0010 = Groups 33 to 48
0001 = Groups 49 to 64
OFF ON
Communication Conf.
SW24
Controlled unit number
mode switching (4)
0 = All groups
1 = Assigned groups
Central remote controller
Header unit switching (1)
0 = Header unit
1 = Follower unit
Weekly timer input switching (1)(2)(3)
See the table on the next page
Default screen
Address acquisition method switching (7)
0 = Complete Search of 29 to 31 Outdoor line
Indoor unit Only
1 = Complete Search of All Outdoor line Indoor
unit
SW25
Operating the key lock at power fail recovery (3)
0 = Cancel restricted state
1 = Continue restricted state

18
Weekly timer input switching SW24
Timer OFF→ON Timer ON→OFF 1 2 3
All start All stop 0 0 0
No change All stop 1 0 0
Permitted all indoor unit operation by
using RCU
All indoor units are centralized 1 0 1 0
All stop and all indoor units are centralized 1 1 1 0
All indoor units are centralized 2 0 0 1
All stop and all indoor units are centralized 2 1 0 1
SW23
1
Header 0
Follower 1
Controlled unit number
mode switching
SW23 SW24
2 3 4 5 4
All groups 0 0 0 0 0
Groups 1 to 16 1 0 0 0 1
Groups 17 to 32 0 1 0 0 1
Groups 33 to 48 0 0 1 0 1
Groups 49 to 64 0 0 0 1 1
Central remote controller header/
follower switching
SW24
7
Complete Search of 29 to 31 System Indoor Equipment Only 0
Complete Search of All Systems Indoor Equipment 1
Address acquisition method switching
SW25
3
Cancel restricted state 0
Continue restricted state 1
Operating the remote-controlled lock at
power fail recovery

19
11Troubleshooting
11-1.Problems that prevent connections
Operating conditions do not match remote controller status.
The displayed order of the air conditioners is strange.
The acquired temperature is incorrect.
No. Cause Support
1Setting error
Check that the addresses recognized by the centralized controller and the
addresses set for the air conditioners match.
Use the UNIT button on the local remote control to confirm an air conditioner
address.
Correct the air conditioner address or the Central remote controller.
No. Cause Support
1Setting error
The displayed order of the air conditioners is the ascending order of
centralized control addresses set for the air conditioners.
Change the centralized control address to the order you want to display.
No. Cause Support
1The acquired temperature is the temperature of intake
air that has been modified for room temperature control.
Since the correction amount varies with operation mode (Cool, Heat), it may
differ from the actual room temperature.
Code indication
Air conditioner errors and system errors detected by the Central remote controller displayed on the Central remote controller
LCD screen.
Check code Alarm Content Action
C 06 Errors in air conditioner communications Check TCC-LINK communications
Error codes other than above Errors detected in the air conditioners Check the air conditioners

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11-2.Other Problems
Local remote control does not work.
Air conditioners do not operate according to made settings (for
example, on/off). Settings are restored to the previous ones over
time.
Set temperature changes erratically.
An alarm code apart from C06 is displayed in the air conditioning
control system screen.
11-3.Installation Problems
The controller LCD Screen Display is incorrect.
No. Cause Support
1The key lock is set.
Check that the “Key lock” is set with the centralized controller.
If you want to cancel it, change the “Key lock” setting to “All allowed” with the
centralized controller.
No. Cause Support
1Communication with the air conditioners is not normal. Check whether a communication error with the air conditioners was detected.
2The indoor unit is set as a follower. Change the setting so that the air conditioner header settings match.
3Setting the temperature range for air conditioners Temperatures set outside of the set temperature range are set to the high
limit or low limit within the set temperature range.
4 The address was changed with the remote control or
the wrong centralized control address was set by the
centralized controller.
Re-acquire the address and reset the address to the correct one.
No. Cause Support
1The set temperature has been changed from the local
remote control or another controller.
Check whether the air conditioner has been operated from the local remote
control or another controller.
No. Cause Support
1Alarms detected in the air conditioners
Check the error indicator on the remote control or SMMS series outdoor unit
board.
Identify the failure location or check the components and wiring as described
in the maintenance guide for the specific air conditioner.
No. Cause Support
1All air conditioners are not connected or are not turned
on.
When an attempt is made to obtain an address and it is not possible to
communicate with a single air conditioner, the message "No connected
indoor unit" is displayed. Check the power supply of the air conditioners or
communication wiring.