En-9
7.3.4. Work procedure
(1) Remove the control box cover.
(2) Connect the transmission cable to
the transmission cable terminal.
(3) Firmly attach the transmission
cables using the accessory cable
tie. (in 2 places)
(4)
Connect the power supply cable to
the power supply cable terminal.
(5) Firmly fi x the power supply cable
clamp in place.
(6) Fill the cable holes with putty in
order to prevent small animals
from entering.
(7) Install the Control box cover.
(2)
(4)
(5)
Earth (Ground)
Power supply cable
To indoor unit
(cooling / heating)
Transmission
cable
To indoor unit
To outdoor unit /
other RB unit
To outdoor unit / other
RB unit / indoor unit
(Cooling only)
Power supply cable
Transmission calbe
(3)
(6)
8. FIELD SETTING
CAUTION
Use an insulated screwdriver to set the dip switches.
8.1. PC board layout
Before turning ON the power supply, set the switches. (The switch settings will be
disabled after the power supply has been turned ON.)
PC board
DIP switch
SET1
DIP switch SET1
(setting disabled)
Rotary switch
External Input
connector
Error indicator
lamp (Red)
Power indicator
lamp (Green)
CNA01
CNA02
DIP switch SET2
Rotary switch
DIP switch
SET2
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 Setting range
RB unit address
Manual address setting
Setting
example
“2”
RB AD × 10 RB AD × 1
Automatic address setting*
Set this switch to 00 at factory setting.
0 to 63
Refrigerant
circuit address
Manual address setting
Setting
example
“63”
REF AD × 10 REF AD × 1
Automatic address setting*
Set this switch to 00 at factory setting.
0 to 99
* For details of automatic address setting, please refer to the outdoor unit installation
manual.
8.3. Function setting
Set the DIP switch SET2, referring to the table.
(1) Operation mode selecting switch
SET 2
Operation mode Remarks
12
OFF OFF Priority given to the fi rst command Factory setting
ON OFF
Priority given to external input of RB
unit
OFF ON
Priority given to administrative
indoor unit
ON ON Setting forbidden
(2) Cool/heat selection control time
SET 2
Cool/heat selection control time Remarks
34
OFF OFF 6 min Factory setting
ON OFF 3 min
OFF ON Setting forbidden
ON ON
Setting forbidden
● 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 specified positions are not to be changed.
9. EXTERNAL INPUT
● RB unit can be switched cooling priority and heating priority by using RB
unit PC board CNA01 or CNA02.
● 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
150m.
● 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.
INPUT SELECT
Use either one of these types of terminal according to the application. (Both types of
terminals cannot be used simultaneously.)
(1)
(1)
9366249047-03_IM.indb Sec1:99366249047-03_IM.indb Sec1:9 2015/3/10 14:27:482015/3/10 14:27:48
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