Unit installation

Installation - Electrical
48 SCXF-SVX01K-EN
Wiring the Remote Human
Interface
The remote human interface requires 24 VAC+4volts
power source and a shielded twisted pair communication
link between the remote panel and the interprocessor
communication bridge (ICPB) module at the self-
contained unit.
Field wiring for both the low voltage power and the
shielded twisted pair must meet the following
requirements:
1. All wiring must be in accordance with NEC and local
codes.
2. Reference Table 34, p. 45 for recommended wiring
distance and size.
3. Communication link wiring must be 18 AWG shielded
twisted
pair (Belden 8760, or equivalent).
4. Communication link must not exceed 5,000 feet
maximum
for each link. See Table 33, p. 45
5. Do not run communication link between buildings.
Low Voltage (AC) Field Wiring Connections
To access the wire entry locations, open the RHI panel door
and remove the two screws on the right-hand side of the
key pad. Swing the keypad open, exposing both the wire
entries and the back of the HI module. Refer to Figure 32,
p. 47 and connect one end of the three conductor 24 volt
wires to the remote panel terminal strip (+), (-), and
(ground).
Communication Link (Shielded Twisted Pair)
Wiring
Trim the outer covering of the shielded cable back
approximately 1 inch. See Figure 33, p. 49. Do not cut the
bare shield wire off. Strip approximately 1/2-inch of
insulation from each insulated wire to connect them to the
terminal strip at the remote panel.
Connect the white lead to the positive (+) terminal, the
black lead to the negative (-) terminal, and the bare shield
wire to the terminal at the remote human interface panel.
Close the key pad plate. Install and tighten the two screws
removed earlier. Close the outer door and install the
recessed locking screw at the bottom right hand side of the
enclosure to prevent accidental starting of the unit by
unauthorized personnel while completing the wiring at the
self-contained unit.
At the Self-Contained Unit
Connect the opposite end of the three conductor 24-volt
wire to the appropriate terminal strip as follows:
Note: Although the 24 volt power is not polarity sensitive,
do not connect either the + (plus) or - (minus)
terminals from the remote panel to ground at the
self-contained unit.
Connect the wire connected to the positive (+) terminal at
the remote panel. Connect the wire connected to the
negative (-) terminal at the remote panel. Connect the
ground wire from the remote panel to the unit control
panel casing.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer’s
literature for allowable waiting periods for discharge of
capacitors. Verify with an appropriate voltmeter that all
capacitors have discharged. Failure to disconnect power
and discharge capacitors before servicing could result
in death or serious injury.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
NOTICE:
Equipment Damage!
To prevent control malfunctions, do not run low voltage
wiring (30 volts or less) in conduit with higher voltage
circuits.