Field Installed Control Wiring; Rt-Svx23F-En - Trane WSC036E Installation, Operation And Maintenance Manual

Field Installed Control Wiring

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.
An overall layout of the various control options available
with the required number of conductors for each control
device is illustrated in Figure 42, p.
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
Clearances, " p. 11 for the electrical access locations
provided on the unit and
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.
NOTICE:
Controls Using 24 VAC!
Resistance in excess of 3 ohms per conductor could
cause component failure due to insufficient AC voltage
supply.
c. Be sure to check all loads and conductors for
grounds, shorts, and mis-wiring.

RT-SVX23F-EN

34.
to"Unit
Table 5, p. 29 for AC conductor
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 37, p. 30.
Table 5. AC conductors
Distance from Unit to
Control
000 - 460 feet
000 - 140 m
461 - 732 feet
141 - 223 m
733 - 1000 feet
224 - 305 m
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. 11
locations provided on the unit.
1. Table 6, p. 29 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.
4. Route low voltage wiring per illustrations on
p. 30.
Table 6. DC conductors
Distance from Unit to
Control
0 - 150 feet
0 - 45.7 m
151 - 240 feet
46 - 73.1 m
241 -385 feet
73.5 - 117.3 m
386 - 610 feet
117.7 - 185.9 m
611 - 970 feet
186.2 - 295.7 m
Installation
Recommended Wire Size
18 gauge
2
.75 mm
16 gauge
2
1.3 mm
14 gauge
2
2.0 mm
for the electrical access
Figure 37,
Recommended Wire Size
22 gauge
2
.33 mm
20 gauge
2
.50 mm
18 gauge
2
.75 mm
16 gauge
2
1.3 mm
14 gauge
2
2.0 mm
29