Trane SCXG-SVX01B-EN Wiring the Remote Human Interface, LowVoltage AC FieldWiring Connections

pre-startup

Installation requirements

Wiring the Remote Human Interface

The remote human interface requires 24 VAC + 4 volts 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:

Note: To prevent control malfunctions, do not run low voltage wiring (30 volts or less) in conduit with higher voltage circuits.

￿WARNING

HazardousVoltage w/Capacitors!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout proce- dures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided byTrane 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.

Note: For additional information regard- ing the safe discharge of capacitors, see PROD-SVB06A-EN or PROD-SVB06A-FR.

1.All wiring must be in accordance with NEC and local codes.

2.ReferenceTable I-PR-3 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 I-PR-2.

5.Do not run communication link between buildings.

LowVoltage (AC) FieldWiring

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 I-PR-24 and connect one end of the three conductor 24 volt wires to the remote panel terminal strip (+), (-), and (ground).

Communication Link (ShieldedTwisted Pair)Wiring

Trim the outer covering of the shielded cable back approximately 1 inch. See Figure I-PR-25. 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:

Figure I-PR-25. Dressing shielded twisted wire

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.

Interprocessor Communication Bridge ModuleWiring

Refer to Figure I-PR-25 and trim the outer covering of the shielded cable back approximately one inch. Cut the bare shield wire off even with the outer covering. Strip approximately 1/2-inch of insulation from each insulated wire in order to connect them to the terminal strip at the unit.Wrap tape around any exposed foil shield and/or base shield wire.

Note:The communication link is polarity

sensitive.

Refer to the unit wiring diagram and connect the white lead to the positive (+) terminal and the black lead to the negative (-) terminal. (These terminals are numbered. Reference to color is for clarification to maintain polarity).

Note: To maintain polarity, do not connect

the base shield wire to ground at the self-

contained unit.

SCXG-SVX01B-EN 55