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Transmission line
6. 4.
CAUTION
Caution when wiring cable
•
When stripping off the coating of lead wire, always use
the exclusive tool such as a wire stripper. If there is no
exclusive tool available necessarily, carefully strip the
coating by a cutter etc. so that the conductive wire is
not damaged.
If it is damaged, it may lead to an open circuit and a
communication error.
Pay attention to the following points while attaching
•
wires on the terminal board.
Do not attach 2 wires on one side.
Do not twist wires.
Do not cross the wires.
Do not shorted at edge at root.
NO GOOD
OK
NO GOOD
NO GOOD
NO GOOD
OK
2pcs at one side
Shorted at edge
Wires twisted
Shorted at root
1 wire
2 wires
Transmission wiring speci
fi
cations
6. 4. 1.
Follow the speci
fi
cations below for the transmission cable.
Use
Size
Wire type
Remarks
Transmission cable
0.33mm
2
22AWG LEVEL 4 (NEMA) non-polar 2core,
twisted pair solid core diameter 0.65mm
LONWORKS®
compatible cable
Wiring rules
6. 4. 2.
(1)Total length of transmission cable
Total transmission line length : MAX 3600m
EF+EG+GH+HJ+HK+KL < 3600m (Fig.2)
In the following cases , Signal Ampli
fi
er is required.
①
When the total length of the transmission line
exceeded 500m.
AB+BC+BD > 500m (Fig.1)
②
When the total number of units* is over 64.
③
Transmission line length between each unit*
≧
400m
(2)Length of transmission cable between 1 network seg-
ment (NS)
EF+EG+GH+HJ+HK
≦
500m (Fig.2)
KL
≦
400m (Fig.2)
(3)Length of transmission cable between outdoor units in a
refrigerant system
MN
≦
18m
NP
≦
18m
Unit* means indoor unit, outdoor unit, Touch Panel
NOTE)
Controller and System Controller, Signal Ampli
fi
er,
single split adaptor, Network Convertor etc..
Do not use loop wiring. This may lead to parts damage
and erroneous operation.
1
Fig.
Transmission line
Outdoor unit
Indoor unit
System
Controller
Touch Panel
Controller
Terminal
resistor
When AB+BC+BD>500m:
Signal Ampli
fi
er is required.
A
B
C
D
2
Fig.
Outdoor unit
Indoor unit
Signal Ampli
fi
er
System
Controller
Touch Panel
Controller
Transmission line
Terminal resistor
Terminal resistor
NS 1
NS 2
F
H
L
G
K
J
E
P
M
N
9378945029-03_IM_EN.indb 21
9378945029-03_IM_EN.indb 21
2011-9-20 16:25:55
2011-9-20 16:25:55