Installation
24
RT-SVX38C-EN
Field-Installed Control Wiring
Note:
All field wiring must conform to NEC guidelines as
well as state and local codes.
Control Power Transformer
The 24-volt control power transformers are to be used only
with the accessories called out in this manual.
Transformers rated greater than 50 VA are equipped with
internal circuit breakers. If a circuit breaker trips, turn off all
power to the unit before attempting to reset it.
The transformer is located in the control panel. The circuit
breaker is located on the left side of the transformer; reset
it by pressing the black reset button.
Controls Using 24 VAC
Before installing any connecting wiring, refer to
“Unit
Dimensions,” p. 10
for the electrical access locations
provided on the unit,
Table 4, p. 24
for AC conductor sizing
guidelines, and the following guidelines:
•
Use copper conductors unless otherwise specified.
•
Ensure that the AC control wiring between the controls
and the unit’s termination point does not exceed
3 ohms/conductor for the length of the run.
Note:
Resistance in excess of 3 ohms per conductor
may cause component failure due to
insufficient AC voltage supply.
Note:
Be sure to check all loads and conductors for
grounds, shorts, and mis-wiring.
•
Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
•
Route low voltage wiring per
Figure 27, p. 25
.
Controls using DC Analog Input/Outputs
(Standard Low Voltage Multi-Conductor
Wire)
Before installing any connecting wiring between the unit
and components using a DC analog input\output signal,
refer to
“Unit Dimensions,” p. 10
for the electrical access
locations provided on the unit.
•
Table 5, p. 24
lists the conductor sizing guidelines that
must be followed when interconnecting the DC binary
output devices and the system components using 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.
Note:
Ensure that the wiring between controls and the
unit’s termination point does not exceed 2.5 ohms
per conductor for the length of the run.
•
Do not run the electrical wires transporting DC signals
in or around conduit housing high voltage wires.
•
Route low voltage wiring per
Figure 27, p. 25
.
DC Conductors
Figure 24.
All units
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
Field-powered
convenience outlet
conduit
Seal between
wiring and conduit
with weatherproof
sealer to prevent
air leakage
Control wiring
conduit
Power wiring
conduit
Black gasket
Table 4.
Electromechanical thermostat 24V AC
conductors with ReliaTel™
Distance from Unit to Control Recommended Wire Size
000 to 460 feet
18 gauge
000 to 140 m
.75 mm2
461 to 732 feet
16 gauge
141 to 223 m
1.3 mm2
733 to 1000 feet
14 gauge
224 to 305 m
2.0 mm2
Table 5.
Zone sensor module wiring
Distance from Unit to Control Recommended Wire Size
0 to 150 feet
22 gauge
0 to 45.7 m
.33 mm2
151 to 240 feet
20 gauge
46 to 73.1 m
.50 mm2
241 to 385 feet
18 gauge
73.5 to 117.3 m
.75 mm2
386 to 610 feet
16 gauge
117.7 to185.9 m
1.3 mm2
611 to 970 feet
14 gauge
186.2 - 295.7 m
2.0 mm2
Summary of Contents for RT-SVX38C-EN
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