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11-2. Address Setting and Group/Twin/Triple Control
<Definition of terms>
Indoor unit No.
Group address
Header indoor unit (=1) : A representative unit of multiple indoor units in group operation, which performs
Follower indoor unit (=2) : Indoor units except header unit in group operation.
Main unit
(Representative)
(Twin header)
Sub indoor unit
(Sub unit)
(Twin follower)
[1] System Configuration
a) Single
Outdoor
unit
Indoor
1:1
(H/M)
unit
individual
Remote
controller
c) Single group operation
2-1
1-1
F/M
F/M
Each indoor unit controls outdoor unit individually.
d) Multiple single/twin/triple group operation (manual address setting)
2-1
1-1
F/M
F/M
• Main indoor unit : Receives data (thermo status, etc.) from sub indoor units with same refrigerant line
address, and controls O/U compressor referring to the self thermo status. Transmits this
instruction to sub units.
• Sub indoor unit : Receives data from the main indoor unit with same refrigerant line address and serial
interface with O/U, and performs thermo operation in synchronization with the main unit.
Sends self thermo ON/OFF request to the main unit.
(Example) 1-1 main unit communicates with 1-2 and 1-3 sub units without being affected
: N-n=O/U refrigerant line address N (30 max.) -I/U address n (64 max.)
: 0=Individual (without group control)
1=Header unit under group control
2=Follower units under group control
communication between remote controller and follower I/U.
(* It does not mean an indoor unit that communicates with O/U.)
Operation mode and setting temperature range (except louver air flow control) of
header unit are reflected on the LCD of remote controller.
It does not control communication with remote controller in principle (except
response to alarm/service data request).
: In a minimal configuration of refrigerant cycle such as twin, triple or double twin,
an indoor unit which communicates with O/U among those with same refrigerant
line address.
Communicates with sub indoor units and with O/U (instructions to compressor)
on behalf of cycle control.
: Indoor units except the main indoor unit in a twin, triple or double twin system.
Communicates with the main indoor unit with the same refrigerant line address,
and provides control in synchronization with the main indoor unit.
It does not communicate with O/U (no detection of serial signal alarm).
b) Twin, triple, double twin
1-2
1-1
H/M
F/S
4-1
3-1
H/M
F/M
1-2
1-3
3-3
F/S
F/S
H/M
by indoor units with refrigerant line address 2 or 3.
- 83 -
1-4
1-3
F/S
F/S
8-1
F/M
H : Header indoor unit
3-4
3-2
3-1
F : Follower indoor unit
F/S
F/S
F/S
M : Main indoor unit
S : Sub indoor unit
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