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8. FIELD SETTING
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
SET2
Rotary switch
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
Manual address setting
Setting
example
"2"
RB unit address
Automatic address setting*
Set this switch to 00 at factory setting.
Manual address setting
Setting
example
Refrigerant
"63"
circuit address
Automatic address setting*
Set this switch to 00 at factory setting.
* 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
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 specified positions are not to be changed.
En-9
CAUTION
Rotary switch
Power indicator
lamp (Green)
Error indicator
lamp (Red)
DIP switch SET1
(setting disabled)
External Input
connector
CNA01
DIP switch SET2
CNA02
Type of switch
Setting range
RB AD × 10
RB AD × 1
REF AD × 10
REF AD × 1
Operation mode
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 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.)
Dry contact terminal ([CNA01])
When a power supply is unnecessary at the input device you want to connect, use
the Dry contact terminal ([CNA01]).
*a
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.
0 to 63
0 to 99
NOTE : When connected to multiple RB units directly, it will cause breakdown.
Apply voltage terminal ([CNA02])
When a power supply must be provided at the input device you want to connect, use
the Apply voltage terminal ([CNA02])
Load
resistance
*1: Make the power supply DC12 to 24V. Select a power supply capacity with an
ample surplus for the connected load.
Do not impress a voltage exceeding 24V across pins 1-3.
*c: The allowable current is DC 5mA to 10mA. (Recommended: DC5mA)
Provide a load resistance such that the current becomes DC10mA or less.
Select very low current use contacts (usable at DC12V, DC1mA or less).
*d: The polarity is [+] for pin 1 and [-] for pin 3. Connect correctly.
PC Board
*a: Select very low current use
contacts (usable at DC12V,
CNA01
DC1mA or less).
1
*b: The wiring is different from
Apply voltage terminals. Be
2
suffi ciently careful when wiring.
GND
*b
K1
K2
Input device
K1-K2 : Relay
(Device for DC current)
DC power sup-
ply 12 - 24V
-
+
*c
connected unit
PC board
CNA 01
PC board
CNA 01
*1
PC board
+
1
2
CNA02
-
3
*d
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