Trane CSRA025FAF0, Installation Operation & Maintenance

Page: 45 / 83

CSRA-SVX02A-EN 45
Installation
Table 6 — DC Conductors
Controls using DC Communication Links
Before installing any connecting wiring between the unit and components
utilizing a DC communication link, refer to the connection diagram that
shipped with the unit for the electrical access and connection locations
provided on the unit.
A. Wiring for the components utilizing a DC communication link must be
shielded cable (Belden 8760 or equivalent). Ground the shield at one end
only.
B. Table 6 lists the conductor sizing guidelines that must be followed when in-
terconnecting a communication link to the unit.
C. Communication link must not exceed 5,000 feet maximum for each link.
D. Communication link must not pass between buildings.
E. Do not run the electrical wires transporting DC signals in or around conduit
housing AC voltage wires.
Table 7 — Maximum Communications Wiring Length
PF/FT = Picofarads/foot
Distance from
Unit to Control
Recommended
Wire Size
000 - 499 feet 16 gauge
500 - 1000 feet 14 gauge
Maximum
Communication
Link Wiring Length
Maximum
Capacitance
Between
Conductors
1,000 feet Up to 60 PF/FT
2,000 feet Up to 50 PF/FT
3,000 feet Up to 40 PF/FT
4,000 feet Up to 30 PF/FT
5,000 feet Up to 25 PF/FT