Trane UNT-SVX07A-EN pre-startup, Communication Wiring, Device Addressing, Wire Characteristics

pre-startup

Installation requirements

Communication Wiring

Units with Tracer ZN510 and ZN520 Only

Communications

Tracer ZN510 and ZN520 controllers are LonTalk® devices that interface with the Trane Tracer Summit building management system. Reference the unit wiring diagram or submittals.

Ground shields at each Tracer ZN510 and ZN520, taping the opposite end of each shield to prevent any connection be- tween the shield and anther ground. Refer to Trane publication, CNT-SVX04A- EN Installation, Operation and Program- ming Guide, for the communication wiring diagram.

Communication wire must conform to the following specification:

1.Shielded twisted pair 18 AWG

2.Capacitance 23 (21-25) picofarads (pF) per foot

3.Listing/Rating – 300V 150C NEC 725-2

(b) Class 2 Type CL2P

4.Trane Part No. 400-20-28 or equivalent, available through Trane BAS Buying Group Accessories catalog.

Note: Communication link wiring is a shielded, twisted pair of wire and must comply with applicable electrical codes.

Follow these general guidelines when installing communication wiring on units with a Tracer ZN510 or ZN520 controller:

•Maintain a maximum 5000 ft. aggregate run.

•Install all communication wiring in accordance with the NEC and all local codes.

•Solder the conductors and insulate (tape) the joint sufficiently when splicing communication wire. Do not use wire nuts to make the splice.

•Do not pass communication wiring between buildings because the unit will assume different ground potentials.

•Do not run power in the same conduit or wire bundle with communication link wiring.

Note: You do not need to observe polarity for LonTalk communication links.

Device Addressing

LonTalk devices are given a unique address by the manufacturer. This address is called a Neuron ID. Each Tracer ZN510 and ZN520 controller can be identified by its unique Neuron ID, which is printed on a label on the controller’s logic board. The Neuron ID is also displayed when communication is established using Tracer Summit or Rover service tool. The Neuron ID format is 00-01-64-1C-2B-00.

Wire Characteristics

Controller communication-link wiring must be low capacitance, 18-gage, shielded, twisted pair with stranded, tinned-copper conductors. For daisy chain configurations, limit the wire run length to 5,000 ft. Truck and branch configurations are significantly shorter. LonTalk wire length limitations can be extended through the use of a link repeater.

Recommended

Communication Wiring

Practices

The following guidelines should be followed while installing communication wire.

•LonTalk is not polarity sensitive. Trane recommends that the installer keep polarity consistent throughout the site.

•Only strip away two-inches maximum of the outer conductor of shielded cable.

•Make sure that the 24VAC power supplies are consistent in how they are grounded. Avoid sharing 24VAC between LonTalk UCMs.

•Avoid over-tightening cable ties and other forms of cable wraps. A tight tie or wrap could damage the wires inside the cable.

•Do not run LonTalk cable alongside or in the same conduit as 24VAC power.

•In an open plenum, avoid lighting ballasts, especially those using 277VAC.

•Do not use a trunk and branch configuration, if possible. Trunk and branch configurations shorten the distance cable can be run.

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