Unit installation

Installation - Electrical
42 SCXF-SVX01K-EN
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,
suc
h 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
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 28, p. 42. Seal the hole in the wall behind the
subbase.
Note: Guidelines for wire sizes and lengths are shown in
Table 32, p. 42.The total resistance of these low
voltage wires must not exceed 2.5 ohms per
conductor. Any resistance 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.
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
Table 32. Zone sensor maximum lengths and wire size
Distance from Unit to
Controller Recommended Wiring Size
0-150 feet 22 gauge
151--240 feet 20 gauge
241-385 feet 18 gauge
386- 610 feet 16 gauge
611-970 feet 14 gauge
Figure 28. Typical zone sensor installation
Junc-
tion
Mounting to Junction Box
Mounting Directly to the Wall