En-16
7. FIELD SETTING
CAUTION
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.
DIP Switch Function
SET 1 1-4 Prohibited
SET 2 1-4 Prohibited
SET 3
1
Outdoor unit address setting
2
3
Setting for number of subordi-
nate units
4
SET 4 1-4 Prohibited
SET 5
1-2
Number of outdoor units
installed
3 Prohibited
4 Terminal resistor setting
7 Segment
LED indicator
Push button
LED lamp
Rotary switch
Outdoor unit PC board
DIP switch
7.2.2 Settings to be confi gured locally
(1) Outdoor unit address setting
When 2 or 3 outdoor
units are installed to 1
refrigerant system, set the
address for each outdoor
unit.
Set the address for all
outdoor units.
SET3 Outdoor
unit ad-
dress
Remarks
12
OFF OFF 0
Primary unit
(Factory setting)
OFF ON 1 Subordinate unit 1
ON OFF 2 Subordinate unit 2
ON ON - Prohibited
(2) Number of subordinate units setting for outdoor unit
Set the number of subor-
dinate units connected to
1 refrigerant system.
Set only the primary unit.
SET3 Number of
connect-
able out-
door units
Remarks
34
OFF OFF 0
Primary unit only
(Factory setting)
OFF ON 1
1 subordinate unit con-
nected
ON OFF 2
2 subordinate unit con-
nected
ON ON - Prohibited
(3) Number of outdoor units installed
The number of outdoor
units installed in 1 refriger-
ant system must be set.
Set for all outdoor units.
SET5 Number of
outdoor
units
Remarks
12
OFF OFF 1 (Factory setting)
OFF ON 2 -
ON OFF 3 -
ON ON - Prohibited
7.2.3 Terminal resistor setting
CAUTION
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).
SET5
Terminal
resistor
Remarks
4
OFF Disable (Factory setting)
ON Enable —
NS2 (Network
segment 2)
NS3 (Network
segment 3)
NS4 (Network
segment 4)
NS1 (Network segment 1)
(Set terminal resistor at outdoor units)
(Primary)
(Primary)
(Primary)
Refrigerant system 1
Refrigerant system 2
Refrigerant system 3
Terminal resistor: off
Terminal resistor: on
Terminal resister: on
About the setting of
terminal resistor
Outdoor unit
(Primary)
Install
Do not
install
: on
: off
Signal amplifier
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.
Refrigerant
circuit
address
Rotary
Switch
Setting
REF AD
×10 ×1
000
101
202
⁞⁞⁞
98 9 8
99 9 9
Setting
Setting
range
Type of switch
Refrigerant
circuit
address
0 to 99
Setting
example
63
REF AD × 10
REF AD × 1
Rotary Switch (REF AD × 1): Factory setting “0”
Rotary Switch (REF AD × 10): Factory setting “0”
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
7-segment display
Factory
default
First 2
digits
Last 2
digits
00
Pipe length set-
ting (*1)
Standard (40 to 65 m)
00
00
z
Short (less than 40 m) 0 1
Medium (65 to 90 m) 0 2
Long 1 (90 to 120 m) 0 3
Long 2 (120 to 165 m) 0 4
Pipe length means the length between primary outdoor unit and the nearest
indoor unit.
10
Sequential start
shift (*1)
Normal
10
00
z
21 sec. Delay 0 1
42 sec. Delay 0 2
63 sec. Delay 0 3
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.
9378945708-02_IM_L9.indb 169378945708-02_IM_L9.indb 16 2022/1/20 15:34:382022/1/20 15:34:38
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