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46 SCXG-SVX01B-EN
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
pre-startup
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
ƽƽ
ƽƽ
ƽWARNING
Hazardous Voltage 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 by Trane or others,
refer to the appropriate manufacturer’s
Installation
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 22 gauge
151--240 feet 20 gauge
241-385 feet 18 gauge
386- 610 feet 16 gauge
611-970 feet 14 gauge