RT-SVX23D-EN 31
Installation
Control Power Transformer
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.
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.
Failure to disconnect power before servicing can cause severe personal injury or death.
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 Clearances,” p. 13 for the electrical access
locations provided on the unit and Table 4, p. 31 for AC conductor sizing guidelines, and;
a. Use copper conductors unless otherwise specified.
b. 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 may cause component failure due to
insufficient AC voltage supply.
c. Be sure to check all loads and conductors for grounds, shorts, and mis-wiring.
d. Do not run the AC low voltage wiring in the same conduit with the high voltage power wiring.
e. Route low voltage wiring per illustrations on Figure 25, p. 33.
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 Clearances,” p. 13 for the electrical access locations provided on
the unit.
1. Table 5, p. 32 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.
Table 4. AC Conductors
Distance from Unit to Control RecommendedWire Size
000 - 460 feet
000 - 140 m
18 gauge
.75 mm
2
461 - 732 feet
141 - 223 m
16 gauge
1.3 mm
2
733 - 1000 feet
224 - 305 m
14 gauge
2.0 mm
2
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