Trane Modu Wiring the Remote Human Interface, Do not run communication link between buildings

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.

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

2.ReferenceTable I-PR-8 on page 58 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.

5.Do not run communication link between buildings.

!WARNING

Communication Link (ShieldedTwisted Pair) Wiring

Trim the outer covering of the shielded cable back approximately 1 inch. See Figure I-PR-35. 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.

Interprocessor Communication Bridge Module Wiring

Refer to Figure I-PR-33 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.

Before servicing unit, disconnect all electric power, including remote disconnects. Failure to do so may cause severe personal injury or death.

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 I-PR-32 on page 60 and connect one end of the three conductor 24 volt wires to the remote panel terminal strip (+), (-), and (ground).

Figure I-PR-33. Dressing shielded twisted wire.

SCXG-SVX01B-EN 61