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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
SET3 and SET5 must be set for the
DIP switch.
Configure the settings before turning
on the power. Settings for SET1,
SET2, and SET4 DIP switches are
factory default ones. Do not change
them.
Outdoor unit PC board
7.2.2 Settings to be confi gured locally
(1) Outdoor unit address setting
When 2 or 3 outdoor
SET3
units are installed to 1
refrigerant system, set the
1
address for each outdoor
unit.
OFF
OFF
Set the address for all
outdoor units.
OFF
ON
ON
OFF
ON
ON
(2) Number of subordinate units setting for outdoor unit
Set the number of subor-
SET3
dinate units connected to
1 refrigerant system.
3
Set only the primary unit.
OFF
OFF
OFF
ON
ON
OFF
ON
ON
(3) Number of outdoor units installed
The number of outdoor
SET5
units installed in 1 refriger-
ant system must be set.
1
Set for all outdoor units.
OFF
OFF
OFF
ON
ON
OFF
ON
ON
CAUTION
DIP Switch
Function
SET 1
1-4
Prohibited
SET 2
1-4
Prohibited
1
Outdoor unit address setting
2
SET 3
3
Setting for number of subordi-
nate units
4
SET 4
1-4
Prohibited
Number of outdoor units
1-2
installed
SET 5
3
Prohibited
4
Terminal resistor setting
7 Segment
LED lamp
LED indicator
Rotary switch
Push button
DIP switch
Outdoor
unit ad-
Remarks
2
dress
Primary unit
0
(Factory setting)
1
Subordinate unit 1
2
Subordinate unit 2
-
Prohibited
Number of
connect-
Remarks
able out-
4
door units
Primary unit only
0
(Factory setting)
1 subordinate unit con-
1
nected
2 subordinate unit con-
2
nected
-
Prohibited
Number of
outdoor
Remarks
2
units
1
(Factory setting)
2
-
3
-
-
Prohibited
7.2.3 Terminal resistor setting
Be sure to set the terminal resistor according to specifications.
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 SET5)
of the terminal resistor of the outdoor
units as shown below from conditions
(1) to (3).
NS1 (Network segment 1)
(Set terminal resistor at outdoor units)
Terminal resistor: on
(Primary)
Refrigerant system 1
Terminal resistor: off
(Primary)
Refrigerant system 2
Refrigerant system 3
(Primary)
NS2 (Network
NS3 (Network
segment 2)
segment 3)
Terminal resister: on
7.3. Rotary switch setting
The rotary switch (REF AD) sets the refrigerant circuit address of the outdoor unit. Config-
ure the settings only on the primary unit of a refrigerant system.
If multiple refrigerant systems are connected, set the rotary switch (REF AD) as shown in
the table below.
Rotary
Setting
Switch
Refrigerant
Setting
circuit
address
REF AD
Refrigerant
×10
×1
circuit
0
0
0
address
1
0
1
2
0
2
Rotary Switch (REF AD × 1): Factory setting "0"
⁞
⁞
⁞
Rotary Switch (REF AD × 10): Factory setting "0"
98
9
8
99
9
9
7.4. Push button setting
Various functions can be set when necessary.
Perform settings after all indoor units have stopped operation.
List of Settings
No
Setting Item
Standard (40 to 65 m)
Short (less than 40 m)
Pipe length set-
Medium (65 to 90 m)
ting (*1)
00
Long 1 (90 to 120 m)
Long 2 (120 to 165 m)
Pipe length means the length between primary outdoor unit and the nearest
indoor unit.
Normal
21 sec. Delay
Sequential start
shift (*1)
42 sec. Delay
63 sec. Delay
10
The start-up timing of outdoor unit (compressor) can be set up so that it can delay
several seconds.
This feature is useful when multiple number of outdoor units are installed and
turned on at the same time to limit the starting current.
CAUTION
SET5
Terminal
Remarks
resistor
4
OFF
Disable
(Factory setting)
ON
Enable
—
About the setting of
terminal resistor
Outdoor unit
(Primary)
: on
: off
Signal amplifier
Install
Do not
install
NS4 (Network
segment 4)
Setting
Type of switch
range
Setting
0 to 99
example
63
REF AD × 10 REF AD × 1
7-segment display
First 2
Last 2
digits
digits
0
0
0
1
0
0
0
2
0
3
0
4
0
0
0
1
1
0
0
2
0
3
Factory
default
En-16
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