En-22
Fig. 4.10-4
Distance from termination resistor (m)
0 ~100
~ 200
~ 300
~400
~500
0 ~ 50
A short circuit somewhere or 2 or
more termination resistors are connected
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190 ~
Faulty contact or wiring length over 500 m
1K ~
∞
Faulty contact, open circuit, or no
termination resistor
Approximate resistance (
Ω
)
Table. 4.10-4
Resistance measurement of transmission line
(Measure with
breaker OFF)
Upon completion of transmission cable wiring, measure the resis-
tance of both end of transmission cable of the unit.
This resistance (refer to“4.11.4.”) shows Table 4.10-4 value de-
pending on the distance from the unit (Outdoor unit or Signal
amplifier) on which the terminal resistor was installed. Please note
that these values are approximate.
Do not turn on the power if the resistance value is abnormal.
It may break Transmission PCB.
Shielding process of transmission line
Shield wires at the both end of transmission line shall be secured
to each unit’s frame ground with screw. Be careful not to tighten
the screw too much. If it is tightened excessively, an open circuit
or breakage of terminal block may occur.
Control box
metal cover
Transmission cable
(Indoor unit and outdoor
unit connection cable)
Bush
Power supply cord
Power terminal board
Transmission
terminal board
Ring torque
terminal :M8
70 ~ 80 mm
Power supply
cable
90 ~ 100 mm
40 mm or more
Transmission
cable
30 mm
Cable clip
Power supply
cable
Transmission cord
Control
box
Cord
clamp
Binder C
Binder C
Transmission
cable
For 2 transmission
lines
For a single transmission line
Use binder C to secure the 2
transmission lines and the
cord clamp.
* Use a ring torque terminals to connect the wires to the power terminal board.
Binder C
Fig. 4.10-3
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