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CVHE-SVX005B-EN
condenser water flow during chiller operation will
result in a chiller shut-down.
Refer to as-built schematics on the inside of the control
panel for field wiring. This is a dry binary input;
normally-open, closure for flow. Apply no external
power.
1. With factory-installed ifm efector® flow-sensing
devices, a secondary field-provided flow-sensing
device is optional. When a secondary flow-sensing
device is used, remove the factory jumper, and
install its contacts between 1X1-8 to 1K28-4; this
places the secondary flow sensing device in series
with the ifm efector® flow-sensing device.
2. For field-provided primary proof of flow devices,
connect the primary proof of flow device between
terminals 1X1-6 to 1A29-J3-2. The secondary field
provided flow sensing device is optional; however,
when it is present, it must be field-wired in series
with the primary proof of flow device.
Temperature Sensor Circuits
All temperature sensors are factory-installed except the
optional outdoor air temperature sensor. This sensor is
required for the outdoor air temperature type of chilled
water reset. Use the following guidelines to locate and
mount the outdoor air temperature sensor. Mount the
sensor probe where needed; however, mount the
sensor module in the control panel.
CWR—Outdoor Option
The outdoor temperature sensor is similar to the unit-
mounted temperature sensors in that it consists of the
sensor probe and the module. A four-wire inter-
processor communication (IPC) bus is connected to the
module for 24 Vdc power and the communications link.
Trane recommends mounting the sensor module
within the control panel and the sensor two wire leads
be extended and routed to the outdoor temperature
sensor probe sensing location. This ensures the four-
wire inter-processor control (IPC) bus protection and
provides access to the module for configuration at
start-up.
The sensor probe lead wire between the sensor probe
and the module can be separated by cutting the two-
wire probe lead leaving equal lengths of wire on each
device: the sensor probe and the sensor module.
NNoottee:: This sensor and module are matched and must
remain together or inaccuracy may occur.
These wires can then be spliced with two 14 to 18 AWG
600V wires of sufficient length to reach the desired
outdoor location with a maximum length 1000 ft
(304.8 m). The module four-wire bus must be
connected to the control panel four-wire bus using the
Trane-approved connectors provided.
The sensor will be configured (given its identity and
become functional) at start-up when the Trane service
technician performs the start-up configuration. It will
NOT be operational until that time.
NNoottee:: If shielded cable is used to extend the sensor
leads, be sure to cover the shield wire with tape
at the junction box and ground it at the control
panel. If the added length is run in conduit, do
NOT run them in the same conduit with other
circuits carrying 30 or more volts.
IImmppoorrttaanntt:: Maintain at least 6 in. (15.24 cm) between
low-voltage (less than 30V) and high
voltage circuits. Failure to do so could
result in electrical noise that may distort the
signals carried by the low-voltage wiring,
including the IPC.
Optional Control and Output Circuits
Install various optional wiring as required by the
owner’s specifications (refer to “,”).
Starter Module Configuration
The starter module configuration settings will be
checked (and configured for remote starters) during
start-up commissioning.
NNoottee:: To configure starter modules and perform other
starter checks, it is recommended that the line
voltage three-phase power be turned off and
secured (locked out), and then that a separate
source control power (115 Vac) be utilized to
power up the control circuits.
Use the as-built starter schematic to ensure correct
fuse and terminals. Verify that the correct fuse is
removed and that the control circuit connections are
correct; then apply the 115 Vac separate source power
to service the controls.
Schematic Wiring Drawings
Please refer to the submittals and drawings that
shipped with the unit. Additional wiring drawings for
CenTraVac™ chillers are available from your local
Trane office.
SSyysstteemm CCoonnttrrooll CCiirrccuuiitt WWiirriinngg ((FFiieelldd WWiirriinngg))
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