Wiring Requirements - Trane VAV VV550 LonTalk Installation & Operation Manual

VAV Start Up/Check Out Procedure

Wiring requirements

The recommended Comm5 communication-link wiring is 22 AWG, Level 4, twisted-pair wire. See
Table 5, p. 20
unshielded. However, unshielded wire is recommended for most installations.
The maximum wire length for Comm5 communication links is 4,500 ft (1,400 m). Comm5
communication-link wiring must be installed in a daisy-chain configuration
Figure 5, p.
Table 5. Cable specifications
dc resistance
(Maximum resistance of a single copper conductor regardless of whether or not it is solid or stranded and regardless
of whether or not it is metal coated.)
dc resistance unbalance (maximum)
Mutual capacitance of a pair (maximum)
Pair-to-ground unbalance (maximum)
Characteristic impedence
Attenuation (maximum dB/1,000 ft at 20°C)
Worst-pair near-end crosstalk (minimum)
(Values shown are for information only. The minimum NEXT coupling loss for any pair combination at
room temperature is to be greater than the value determined using the formula NEXT (F
(0.772)-15 (F /0.72) for all frequencies in the range of 0.772 MHz-20 MHz for a length of 1,000
log10 MHz
ft.)
dc resistance unbalance (maximum)
20
"Specifications for Level 4-compliant cables". The wire can be either shielded or
22).
Specification
(Figure 4, p. 21
18.0 Ω/1,000 ft 20°C
1,000 pF/foot/1,000 ft
772 kHz
1.0 MHz
4.0 MHz
8.0 MHz
10.0 MHz
16.0 MHz
20.0 MHz
772 kHz 4.5 dB/1,000 ft at 20°C
1.0 MHz 5.5 dB/1,000 ft at 20°C
4.0 MHz 11.0 dB/1,000 ft at 20°C
8.0 MHz 15.0 dB/1,000 ft at 20°C
10.0 MHz 17.0 dB/1,000 ft at 20°C
772 kHz
1.0 MHz
)>NEXT
MHz
4.0 MHz
8.0 MHz
10.0 MHz
16.0 MHz
20.0 MHz
and
Value
5%
17 pF/foot
102 Ω 15%
±
100 Ω ± 15%
100 Ω 15%
±
100 Ω 15%
±
100 Ω 15%
±
100 Ω 15%
±
100 Ω 15%
±
58 dB
56 dB
47 dB
42 dB
41 dB
38 dB
36 dB
5%
VAV-SVP01A-EN