Installation
22 RT-SVX25M-EN
Controls using 24 Vac
Before installing any connecting wiring, refer to “Unit
Dimensions,” p. 12 for the electrical access locations
provided on the unit and Ta bl e 3 , p . 2 2 for AC conductor
sizing guidelines.
1. Use copper conductors unless otherwise specified.
2. Ensure that the AC control wiring between the controls
and the unit’s termination point does not exceed three
(3) ohms/conductor for the length of the run.
Note: Resistance in excess of 3 ohms per conductor
could cause component failure due to insufficient
AC voltage supply.
3. Be sure to check all loads and conductors for grounds,
shorts, and mis-wiring.
4. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
5. Route low voltage wiring per illustrations on the next
page.
Controls using DC Analog Input/Outputs
(Standard Low Voltage Multiconductor
Wire)
Before installing any connecting wiring between the unit
and components utilizing a DC analog input\output signal,
refer to “Unit Dimensions,” p. 12 for the electrical access
locations provided on the unit.
1. Ta bl e 4 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
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 3. Electromechanical thermostat 24 Vac
conductors with ReliaTel™
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
Table 4. Zone sensor module wiring
Distance from Unit to
Control Recommended Wire Size
0–150 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 13. ReliaTel™ options module
Figure 14. ReliaTel conventional thermostat field wiring
diagram
RTRM
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