Design Technical Manual

Table Of Contents
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Step 7
Conrm proper installation of transmission line.
Conrm transmission line connections to indoor units.
Conrm that there is one terminal resistor on each
each network segment.
Measure the resistance of the signal amplier
terminal and the terminal of the indoor and outdoor
units connected farthest away from the device where
terminal resistor is measured.
A value from the table is displayed, depending on
the distance from the signal amplier and the device
where the terminal resistor is set.
This value is an estimate.
Always ground both ends of the transmission line.
X1 X2
TRANS-
MISSION
X1 X2
TRANS-
MISSION
Transmission line
Indoor unit Indoor unit
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Step 8
Conrm total Signal amplier in VRF Network according following rule.
Signal amplier of lter mode OFF ≤ 8 units
Signal amplier of lter mode ON ≤ 32 units
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Step 9 : Conrm transmission wiring system in VRF network
Conrm transmission wiring is within the following parameters:
Check list
1) Maximum transmission line length between units in 1 segment: Maximum 1312 ft. (400 m)
2) Total transmission line length in 1 segment: Maximum 1640 ft. (500 m)
3) Total transmission line length in 1 VRF network: Maximum 11811 ft. (3600 m)
4) The total number of element in 1 segment: Maximum 64
5) Total of Segment in 1 VRF network: Maximum 9 segments
Distance from termination resistor ft. (m)
Approximate resistance
(Ω)
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 1614 (500)
1K ~
Faulty contact, open circuit, or no
termination resistor
(0 ~ 100) ( ~ 200) ( ~ 300) ( ~ 400) ( ~ 500)
0 ~ 328 ~ 656 ~ 984 ~ 1312 ~ 1640
- (06 - 125) -
SYSTEM
DESIGN
SYSTEM
DESIGN