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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
Refrigerant system 1
Master unit
Terminal resistor: off
Refrigerant system 2
Master unit
Refrigerant system 3
Master unit
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 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
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 150 m)
Pipe length means the length between master 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
(Master unit)
: 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
Cooling capacity
11
shift (*1)
Set this item when necessary.
Heating capacity
shift (*1)
12
Set this item when necessary.
13
Prohibited (Factory default)
14
Prohibited (Factory default)
15
Prohibited (Factory default)
Switching be-
tween batch stop
or emergency
stop (*1)
This mode selects the pattern of the stop function to be operated by the external
input terminal (CN134).
20
• Batch stop: The stop of all indoor units connected to same refrigerant system
due to input signal coming from CN134.
• Emergency stop: When emergency stop is actuated, the indoor unit does not
accept the operation command from the remote controller. On the other hand,
when the emergency stop is released (no input from CN134), the air conditioner
does not return to the original operation until the indoor unit is turned on by the
remote controller.
Snow falling
protection fan
mode (*1)
22
This mode operates the fans of outdoor units in order to prevent the units from stop-
ping operation when they are covered by snow.
Interval setting
for snow falling
protection fan
23
mode (*1)
When the snow falling protection fan mode is set, the operation interval of the fans of
outdoor units can be selected.
High static pres-
sure mode
24
When installing a duct to the blow-off outlet of an outdoor unit, set the high static
pressure mode according to the static pressure of the duct to be installed.
Furthermore, use this setting if the air blow of an outdoor unit is poor, such as when
installed in a place with a low ceiling.
25
Prohibited (Factory default)
26
Prohibited (Factory default)
27
Prohibited (Factory default)
28
Prohibited (Factory default)
29
Prohibited (Factory default)
Energy saving
level setting (*1)
30
The capacity limit can be selected by the external input terminal (CN133) when
operating with the "Energy Saving Peak Cut function".
The lower the level, the more the effect of energy saving, but the cooling/heating
performance will also drop.
32
Prohibited (Factory default)
33
Prohibited (Factory default)
Capacity priority
Factory
setting (in low
noise mode) (*1)
default
40
If the cooling/heating performance becomes insufficient when the low noise mode
is set, it is possible to set "capacity priority" that automatically cancels the low
noise mode (once performance is restored, the mode will automatically return to
the low noise mode).
Low noise mode
41
setting (*1)
Low noise mode
operation level
setting
42
Level 1: The operating sound lowers from about 3 to 5 dB(A) more than the rated
value
Level 2: The operating sound lowers from about 3 to 5 dB(A) more than the Level
1
Normal mode
Save energy mode
1
1
High power mode 1
High power mode 2
Prohibited
Normal mode
Save energy mode
1
2
High power mode 1
High power mode 2
1
3
1
4
1
5
Batch stop
2
0
Emergency stop
Enable
2
2
Disable
Standard (30 minutes)
Short 1 (5 minutes)
2
3
Short 2 (10 minutes)
Short 3 (20 minutes)
Standard
High static pressure 1
(equivalent to 30 Pa)
2
4
High static pressure 2
(equivalent to 80 Pa)
Prohibited
2
5
2
6
2
7
2
8
2
9
Level 1 (stop)
Level 2
(operated at 40% capacity)
Level 3
(operated at 60% capacity)
3
0
Level 4
(operated at 80% capacity)
Level 5
(operated at 100% capacity)
3
2
3
3
Off (quiet priority)
4
0
On (capacity priority)
Off (Normal)
4
1
On (Low noise mode)
Level 1
4
2
Level 2
0
0
0
1
0
2
0
3
0
4
0
0
0
1
0
2
0
3
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
1
0
2
0
3
0
0
0
1
0
2
0
3
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
2
0
3
0
4
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
1
En-16
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