Trane Voyager RT-SVX17C-EN, Установка, эксплуатация и обслуживание

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23
Field Installed Electrical Wiring (Continued)
Low Voltage Wiring
An overall layout of the various control options available for
a Constant Volume application is illustrated in Figure 10.
Figure 11 illustrates the various control options for a Vari-
able Air Volume application. The required number of con-
ductors for each control device are listed in the illustration.
A typical field connection diagram for the sensors and other
options are shown in the following section "Remote Panels
and Sensors". These diagrams are representative of stan-
dard applications and are provided for general reference
only. Always refer to the wiring diagram that shipped with
the unit for specific electrical schematic and connection in-
formation.
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 equipped with
internal circuit breakers. They are to be used only with the
accessories called out in this manual. If a circuit breaker
trips, be sure to turn off all power to the unit before attempt-
ing to reset it.
On units equipped with the VFD option, an additional con-
trol power transformer is used. The secondary is protected
with fuses. Should the fuse blow, be sure to turn off all
power to the unit before attempting to replace it.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote discon-
nects before servicing. Follow proper lockout/tagout pro-
cedures to ensure the power can not be inadvertently en-
ergized. Failure to disconnect power before servicing
could result in death or serious injury.
Field Installed AC Control Wiring
Before installing any connecting wiring, refer to Table 7 for
conductor sizing guidelines and;
a. Use copper conductors unless otherwise specified.
b. Ensure that the AC control voltage 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. Refer to Figure 2 for the electrical access locations
provided on the unit.
Table 7
AC Conductors
Distance from Unit Recommended
to Control Wire Size
000 - 460 feet 18 gauge
461 - 732 feet 16 gauge
733 - 1000 feet 14 gauge
d. Do not run the AC low voltage wiring in the same
conduit with the high voltage power supply wiring.
Be sure to check all loads and conductors for grounds,
shorts, and miswiring. After correcting any discrepancies,
reset the circuit breakers by pressing the black button lo-
cated on the left side of the transformer.
Field Installed DC Control Wiring
Before installing the connecting wiring between the compo-
nents utilizing a DC analog output/input signal and the unit,
refer to Table 8 for conductor sizing guidelines and;
a. Use standard copper conductor thermostat wire
unless otherwise specified.
b. Ensure that the wiring between the controls and the
unit's termination point does not exceed two and a
half (2-1/2) ohms/conductor for the length of the run.
Note: Resistance in excess of 2 1 /
2
ohms per
conductor can cause deviations in the accuracy of
the controls.
c. Refer to Figure 2 for the electrical access locations
provided on the unit.
Table 8
DC Conductors
Distance from Unit Recommended
to Control Wire Size
000 - 150 feet 22 gauge
151 - 240 feet 20 gauge
241 - 385 feet 18 gauge
386 - 610 feet 16 gauge
611 - 970 feet 14 gauge
d. Do not run the electrical wires transporting DC
signals in or around conduit housing high
voltage wires.
Units equipped with the Trane Communication Interface
(TCI) option which utilizes a serial communication link;
a. Must be 18 AWG shielded twisted pair cable
(Belden 8760 or equivalent).
b. Must not exceed 5,000 feet maximum for each link.
c. Must not pass between buildings.