Trane SCXG-SVX01B-EN Zone Sensor Installation, pre-startup, Installation requirements, Notice

pre-startup

Installation requirements

Standard zone sensors, BAYSENS077, ships with all units

Zone Sensor Installation

All sensor options ship in the main control panel and are field-installed. Programmable option installation procedures.

Mounting Location

Mount the sensor on the wall in an area with good air circulation at an average temperature. Avoid mounting space temperature sensor is areas subject to the following conditions:

•Drafts or “dead” spots behind doors or in corners

•Hot or cold air from ducts

•Radiant heat from the sun or appliances

•Concealed pipes and chimneys

•Unheated or non-cooled surfaces behind the sensor, such as outside walls

•Airflows from adjacent zones or other units

To mount the sensors, remove the dust cover and mount the base on a flat surface or 2" x 4" junction box. Sensors ship with mounting screws.

Mounting the Subbase

￿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.

NOTICE

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors may result in equipment damage.

Remove the zone sensor cover from subbase, and mount subbase on the wall or on a 2 x 4 junction box. Route wires through the wire access hole in the subbase. See Figure I-PR-14. Seal the hole in the wall behind the subbase.

Note: Guidelines for wire sizes and lengths are shown in Table I-PR-1. The total resis- tance of these low voltage wires must not exceed 2.5 ohms per conductor. Any resis- tance greater than 2.5 ohms may cause the control to malfunction due to excessive voltage drop.

Note: Do not run low-voltage control wiring in same conduit with high-voltage power wiring.

Wiring

1.Run wires between the unit control panel and the zone sensor subbase.To determine the number of wires required, refer to the unit wiring diagrams.

2.Connect the wiring to the appropriate terminals at the unit control panel and at the zone sensor subbase. In general, zone sensor connections to the unit use the convention of connecting zone sensor terminals to like numbered unit terminals (1 to 1, 2 to 2, etc.).The connection detail is shown on the unit wiring diagrams, which are located in

the unit control panel.

3.Replace the zone sensor cover back on the subbase and snap securely into place.

Standard Remote Sensor (BAYSENS077) When using the remote sensor, BAYSENS077, mount it in the space that is to be controlled.Wire according to the interconnecting wiring diagrams on the unit.

Table I-PR-1. Zone sensor maximum lengths and wire size

Distance from	Recommended
Unit to Controller	Wiring Size
0-150 feet	22gauge
151--240 feet	20gauge
241-385 feet	18gauge
386- 610 feet	16gauge
611-970 feet	14gauge

46 SCXG-SVX01B-EN