Installation
36 RT-SVX21P-EN
Field-Installed Control Wiring
An overall layout of the various control options available
with the required number of conductors for each control
device is illustrated in Figure 36, p. 33.
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 and
can be reset by pressing in on the black reset button.
Controls Using 24 VAC
Before installing any connecting wiring, refer to “Unit
Dimensions,” p. 15 for the electrical access locations
provided on the unit and Table 4, p. 36 or Table 5, p. 36 for
AC conductor sizing guidelines, and;
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: Be sure to check all loads and conductors for
grounds, shorts, and mis-wiring.
3. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
4. Route low voltage wiring per illustrations on page 38.
Controls using DC Analog Input/Outputs
(Standard Low Voltage Multi
conductor Wire)
Before installing any connecting wiring between the unit
and components utilizing a DC analog input\output signal,
refer to “Unit Dimensions,” p. 15 for the electrical access
locations provided on the unit.
• Table 6, p. 37 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.
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.
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.
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.
NOTICE:
Controls Using 24 VAC!
Resistance in excess of 3 ohms per conductor could
cause component failure due to insufficient AC voltage
supply.
Table 4. Electromechanical thermostat 24V AC
conductors with ReliaTel™
Distance from Unit to Control Recommended Wire Size
000 - 460 feet 18 gauge
000 - 140 m .75 mm2
461 - 732 feet 16 gauge
141 - 223 m 1.3 mm2
733 - 1000 feet 14 gauge
224 - 305 m 2.0 mm2
Table 5. Electromechanical thermostat 24V AC
conductors with electromechanical unit
Distance from Unit to Control Recommended Wire Size
0 - 30 feet 22 gauge
0 - 9.1 m .33 m2
31 - 50 feet 20 gauge
9.5 - 15.2 m .50m2
51 - 75 feet 18 gauge
15.5 - 22.9 m .75 m2
76 - 125 feet 16 gauge
23.1 - 38.1 m 1.3 m2
126 - 200 feet 14 gauge
38.4 - 60.9 m 2.0 m2
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