Trane RRU120 D B Series - Installation; DC Wiring and Conductor Guidelines

Installation
26 RRU-SVX01F-EN
Controls using DC Analog Input/Output
(Standard Low Voltage Multiconductor
Wire)
Before installing any connecting wiring between the unit
and components utilizing a DC analog input\output signal,
refer to Figure 2 to Figure 7 for the electrical access
locations provided on the unit.
1. Table 3 lists the conductor sizing guidelines that must
be followed when interconnecting the DC binary
output devices and the system components utilizing a
DC analog input\output signal to the unit.
Note: Resistance in excess of 2.5 ohms per conductor
can cause deviations in the accuracy of the
controls.
2. Ensure that the wiring between controls and the unit’s
termination point does not exceed two and a half (2.5)
ohms/conductor for the length of the run.
3. Do not run the electrical wires transporting DC signals
in or around conduit housing high voltage wires.
DC Conductors
Table 2. 24V AC conductors
Distance from Unit to
Control
Recommended Wire
Size
000–460 feet 18 gauge
000–140 m 0.75 mm
2
461–732 feet 16 gauge
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with an appropriate
voltmeter that all capacitors have discharged.
Table 3. Zone sensor module wiring
Distance from Unit to
Control
Recommended Wire
Size
000–150 feet
0–45.7 m
22 gauge
0.33 mm
2
151–240 feet
46–73.1 m
20 gauge
0.50 mm
2
241–385 feet
73.5–117.3 m
18 gauge
0.75 mm
2
386–610 feet
117.7–185.9 m
16 gauge
1.3 mm
2
611–970 feet
186.2–295.7 m
14 gauge
2.0 mm
2
Figure 11. Space sensor field wiring (optional)