En-13
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
fi
gure.
7. 2. DIP switch setting
7. 2. 1. List of Settings
SET 5 must be set for the DIP switch.
Con
fi
gure the settings before turning
on the power. Settings for SET 1, SET
2, SET 3 and SET 4 DIP switches are
factory default ones. Do not change
them.
DIP Switch
Function
SET 1
1-4
Forbidden
SET 2
1-4
Forbidden
SET 3
1-4
Forbidden
SET 4
1-4
Forbidden
SET 5
1-3
Forbidden
4
Terminal resistor setting
SET5
X 10
X 1
7 Segment
display
Push button
LED lamp
POWER
LED105
LED104
REF AD
SET 1
SW101
SET 2
SW102
SET 3
SW103
SET 4
SW104
ERROR
MODE
LED101
(GREEN)
MODE
/EXIT SELECT ENTER
SW106
SW107 SW108 SW109
SW105
LED102
(RED)
Rotary switch
Outdoor unit printed circuit board
DIP switch
7. 2. 2. Terminating resistor setting
CAUTION
Be sure to set the terminal resistor according to speci
fi
cations.
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 ampli
fi
er.
• When setting the terminal resistor of a signal ampli
fi
er, refer to the installation manual of
the signal ampli
fi
er.
• 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 ampli
fi
ers 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?
Con
fi
gure the setting (DIP switch SET 5)
of the terminal resistor of the outdoor units
as shown below from conditions
1
to
3
.
SET 5
Terminal
resistor
Remarks
4
OFF
Disable
—
ON
Enable
(Factory setting)
Figure: Terminal resistor setting
NS2 (Network segment 2)
NS3 (Network segment 3)
NS4 (Network segment 4)
NS1 (Network segment 1)
(Set terminal resistor at outdoor units)
Master unit
Master unit
Master unit
Refrigerant system1
Refrigerant system2
Refrigerant system3
Terminal resistor: off
Terminal resistor: on
Terminal resistor: on
About the setting of terminal resistor
Outdoor unit
Signal ampli
fi
er
:on
:off
Install
Do not install
7. 3. Rotary switch setting
The rotary switch (REF AD) sets the refrigerant circuit address of the outdoor unit. Con
fi
g-
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.
Refrigerant
circuit
address
Rotary
Switch
Setting
Setting
Setting
range
Type of switch
REF AD
×10
×1
Refrigerant
circuit
address
0–99
Setting
example
63
0
0
0
1
0
1
2
0
2
•
•
•
REF AD × 10 REF AD × 1
•
•
•
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. Set when necessary.
Perform settings after all indoor units have stopped operation.
Table. A: List of Settings
No
Setting Item
7 segment display
Factory
default
First 2 digits Last 2 digits
00
Pipe length setting
*1
Standard (131 to 213 ft)
(40 to 65 m)
0
0
0
0
Short (less than 131 ft)
(less than 40 m)
0
1
Medium (213 to 295 ft)
(65 to 90 m)
0
2
Long 1 (295 to 394 ft)
(90 to 120 m)
0
3
Pipe length means the length between master outdoor unit and the nearest indoor unit.
10
(Forbidden)
1
0
0
0
(Factory default)
11
Cooling capacity
shift *1
Normal mode
1
1
0
0
Save energy mode
0
1
High power mode 1
0
2
High power mode 2
0
3
(Forbidden)
0
4
Set this item when necessary.
12
Heating capacity
shift *1
Normal mode
1
2
0
0
Save energy mode
0
1
High power mode 1
0
2
High power mode 2
0
3
Set this item when necessary.
13
(Forbidden)
1
3
0
0
(Factory default)
14
(Forbidden)
1
4
0
0
(Factory default)
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