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8.2. Address setting
(1) RB unit address
When connecting multiple RB units to 1 refrigerant system, set the address at RB
AD SW.
Rotary switch (RB AD × 1)...Factory setting "0"
Rotary switch (RB AD × 10)...Factory setting "0"
(2) Refrigerant circuit address
In the case of multiple refrigerant systems, set REF AD SW for each refrigerant
system. Set to the same refrigerant circuit address as the outdoor unit.
Rotary switch (REF AD × 1)...Factory setting "0"
Rotary switch (REF AD × 10)...Factory setting "0"
Setting
Type of switch
Manual address setting
Setting
example
"2"
RB unit address
RB AD × 10
Automatic address setting *1
Set this switch to 00 at factory setting.
Manual address setting
Setting
example
Refrigerant
"63"
circuit address
REF AD × 10
Automatic address setting *1
Set this switch to 00 at factory setting.
*1) For details of automatic address setting, please refer to the outdoor unit installation
manual.
• When merging two or four branches and then manually setting the address, set only
the rotary switch where the transmission cable is connected.
8.3. Function setting
Set the DIP switch SET2, referring to the table.
(1) Operation mode selecting switch
SET 2
Operation mode
1
2
OFF
OFF
Priority given to the fi rst command
Priority given to external input of RB
ON
OFF
unit
Priority given to administrative
OFF
ON
indoor unit
ON
ON
(2) Cool/heat selection control time
SET 2
Cool/heat selection control time
3
4
OFF
OFF
ON
OFF
OFF
ON
ON
ON
• If the cool/heat selection control time is short, the sound of passing refrigerant may
be loud during the cool/heat selection control process.
• Settings other than those in specifi ed positions are not to be changed.
• To perform a function setting with 2 or 4 branches merged, use the same "DIP
switch SET2" setting on all the branches merged.
Setting range
0 to 63
RB AD × 1
0 to 99
REF AD × 1
DIP switch SET2
Remarks
Factory setting
Setting forbidden
Remarks
6 min
Factory setting
3 min
Setting forbidden
Setting forbidden
9. EXTERNAL INPUT
•
RB unit can be switched cooling priority and heating priority by using RB
unit PC board terminal.
•
The "external input priority mode" must be set by changing DIP switch
SET2-1, 2 on PC board of RB unit.
•
A twisted pair cable (22AWG) should be used. Maximum length of cable is
492 ft (150 m).
•
Use an external input cable with appropriate external dimension, depending
on the number of cables to be installed.
•
The wire connection should be separate from the power cable line.
CN01
CN101
CN02
CN102
EX. IN D
EX. IN C
9.1. Input select
Use either one of these types of terminal according to the application. (Both types of
terminals cannot be used simultaneously.)
Dry contact terminal (CNA01, CNA101, CNA201, CNA301)
When a power supply is unnecessary at the input device you want to connect, use
the Dry contact terminal (CNA01, CNA101, CNA201, CNA301) .
PC Board
CNA01
*a
1
2
GND
*b
connected unit
When connected to Dry contact terminals of multiple RB units with a connected unit,
insulate each RB unit with relay, etc. as shown on below example.
Input device
NOTE : When connected to multiple RB units directly, it will cause breakdown.
CN201
CN301
CN202
CN302
EX. IN B
EX. IN A
*a: Select very low current use
contacts (usable at DC12V,
DC1mA or less).
*b: The wiring is different from
Apply voltage terminals. Be
suffi ciently careful when wiring.
PC board
CNA 01
K1
PC board
CNA 01
K2
K1-K2 : Relay
(Device for DC current)
En-12
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