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6.6.3. External output terminal
You can detect the operation condition of outdoor unit and the abnormal situation of both
indoor and outdoor unit.
Wiring method and specifications
Error status
This output indicates the outdoor unit and
connected indoor unit's "Normal" or "Error"
status.
Operation status
This output indicates the outdoor unit's
"Operation" status.
P.C.B
CN136 (Black) or
CN137 (Blue)
(*7)
*5: Provide a DC 12 to 24 V power supply.
Select a power supply capacity with an ample surplus for the connected load.
*6: The allowable current is 30 mA or less.
Provide a load resistance such that the current becomes 30 mA or less.
*7: Polarity is [+] for pin 1 and [-] for pin 2. Connect correctly.
Do not impress a voltage exceeding 24 V across pins 1-2.
* A twisted pair cable (22 AWG (0.33 mm²)) should be used. Maximum length of cable is
492 ft (150 m).
* Use an external input and output cable with appropriate external dimension, depending
on the number of cables to be installed.
7. FIELD SETTING
Discharge the static electricity from your body before setting up the DIP switches.
Never touch the terminals or the patterns on the parts that are mounted on the PC
board.
7.1. Field setting switches
Remove the service panel of the outdoor unit and the cover of the electrical component
box to access the PC board of the outdoor unit.
PC board switches for various settings and LED displays are shown in the figure.
7.2. DIP switch setting
7.2.1. List of Settings
SET 5 must be set for the DIP switch.
Configure the settings before turn-
ing on the power. Settings for SET
1, SET 2, SET 3 and SET 4 DIP
switches are factory default ones. Do
not change them.
Outdoor unit
printed circuit
board
DIP switch
En-11
Output
Connector
voltage
Output 1
0 V
Normal
CN136
DC 12-24 V
Error
(Black)
(*5)
Output 2
0 V
Stop
CN137
DC 12-24 V
Operation
(Blue)
(*5)
(*5)
DC power supply
(External) 12-24 V
Connected load (Operation Indica-
tor or Error Indicator)
Connected unit
CAUTION
DIP Switch
Function
SET 1
1-4
Prohibited
SET 2
1-4
Prohibited
SET 3
1-4
Prohibited
SET 4
1-4
Prohibited
1-3
Prohibited
SET 5
4
Terminal resistor setting
LED lamp
7 Segment display
Rotary switch
Push button
DIP switch
7.2.2. Terminal resistor setting
Be sure to set the terminal resistor according to specifications.
Status
Set the terminal resistor for every network segment (NS).
If terminal resistor is set in multiple devices, the overall communication system may be
damaged.
If terminal resistor is not set in a device, abnormal communication may occur.
• Be sure to set 1 terminal resistor in a network segment. You can set the terminal resistor
at the outdoor unit or Signal amplifier.
• When setting the terminal resistor of a Signal amplifier, refer to the installation manual of
the Signal amplifier.
• When setting multiple terminal resistors, take note of the following items.
(1) How many network segments are there in a VRF system?
(2) Where will you set the terminal resistors in a network segment? (Condition for 1 seg-
ment: Total number of outdoor and indoor units and Signal amplifiers is less than 64,
or the total length of the transmission cable is less than 500 m)
(3) How many outdoor units are connected to 1 refrigerant system?
Configure the setting (DIP switch SET 5)
(*6)
of the terminal resistor of the outdoor units
as shown below from conditions (1) to (3).
Figure: Terminal resistor setting
NS1 (Network segment 1)
(Set terminal resistor at outdoor units)
Terminal resistor: on
Master unit
Terminal resistor: off
Master unit
Master unit
NS2 (Network
segment 2)
Terminal resistor: on
7.3. Rotary switch setting
The rotary switch (REF AD) sets the refrigerant system address of the outdoor unit. Con-
figure the settings only on the master unit of a refrigerant system.
If multiple refrigerant systems are connected, set the rotary switch (REF AD) as shown in
the table below.
Rotary
Switch
Refrigerant
Setting
system
REF AD
address
×10
0
0
1
0
2
0
•
•
•
•
98
9
99
9
7.4. Push button setting
Various functions can be set. Set when necessary.
Perform settings after all indoor units have stopped operation.
Table A: List of Settings
No
00
Prohibited (Factory default)
10
Prohibited (Factory default)
Cooling capacity
11
shift (*1)
Set this item when necessary.
CAUTION
SET 5
Terminal
resistor
4
OFF
Disable
ON
Enable
Refrigerant system 1
Refrigerant system 2
Refrigerant system 3
NS4 (Network
NS3 (Network segment 3)
segment 4)
Setting
Setting
range
×1
0
Refrigerant
Setting
system
0–99
example
1
address
63
2
•
•
Rotary Switch (REF AD × 1): Factory setting "0"
8
Rotary Switch (REF AD × 10): Factory setting "0"
9
7 segment display
Setting Item
First 2
digits
0
1
Normal mode
Save energy mode
High power mode 1
1
High power mode 2
Prohibited
Remarks
—
(Factory setting)
About the setting of
terminal resistor
Outdoor unit
: On
: Off
Signal amplifier
Install
Do not
install
Type of switch
REF AD × 10 REF AD × 1
Factory
Last 2
default
digits
0
0
0
0
0
0
0
0
0
1
1
0
2
0
3
0
4
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