Installation Electrical
RT-SVX34F-EN
29
Field Installed DC Control Wiring
Before installing the connecting wiring between the
components utilizing a DC analog output/input signal and
the unit, refer to
Table 14, p. 29
for conductor sizing
guidelines and;
•
Use standard copper conductor thermostat wire
unless otherwise specified.
•
Ensure that the wiring between the controls and the
unit's termination point does not exceed two and a
half (2-1/2) ohms/conductor for the length of the
run.
Note:
Resistance in excess of 21/2 ohms per conductor
can cause deviations in the accuracy of the
controls.
•
Refer to dimensional drawings beginning with
Figure 1, p. 13
for the electrical access locations
provided on the unit.
•
Do not run the electrical wires transporting DC
signals in or around conduit housing high voltage
wires.
Units equipped with the Trane Communication Interface
(TCI) option, which utilizes a serial communication link;
•
Must be 18 AWG shielded twisted pair cable Belden
8760 or equivalent).
•
Must not exceed 5,000 feet maximum for each link.
•
Must not pass between buildings.
WARNING
Proper Field Wiring and Grounding
Required!
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes. Failure to
follow code could result in death or serious injury.
NOTICE:
Use Copper Conductors Only!
Unit terminals are not designed to accept other types
of conductors. Failure to use copper conductors could
result in equipment damage.
Table 14. DC conductors
Distance from unit to control
Recommended wire size
000-150 feet
22 gauge
151-240 feet
20 gauge
241-385 feet
18 gauge
386-610 feet
16 gauge
611-970 feet
14 gauge
