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S S y y s s t t e e m m C C o o n n t t r r o o l l C C i i r r c c u u i i t t W W i i r r i i n n g g ( ( F F i i e e l l d d W W i i r r i i n n g g ) )
21. Oil cooling solenoid valve
22. Inlet guide vane first stage actuator
23. Inlet guide vane second stage actuator
24. Outboard bearing pad temperature sensor 1
25. Outboard bearing pad temperature sensor 2
26. Outboard bearing pad temperature sensor 3
27. Condenser high pressure cut out switch
28. Condenser refrigerant pressure transducer
29. Oil tank vent line valve
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.
N N o o t t e e : : 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). For AWG/MCM equivalents in mm
the table in
"Electrical Requirements," p.
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.
N N o o t t e e : : 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.
I I m m p p o o r r t t a a n n t t : : 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.
76
Optional Control and Output Circuits
Install various optional wiring as required by the
owner's specifications (refer to
Wiring (Field Wiring)," p.
Optional Tracer Communication
Interface
This control option allows the control panel to
exchange information—such as chiller status and
operating set points—with a Tracer® system.
N N o o t t e e : : The circuit must be run in separate conduit to
Additional information about the Tracer®
communication interface option is published in the
Installation and Operation manual that ships with the
Tracer® communication interface
Starter Module Configuration
The starter module configuration settings will be
checked (and configured for remote starters) during
start-up commissioning.
2
, refer to
N N o o t t e e : : To configure starter modules and perform other
53. The
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.
72).
prevent electrical noise interference.
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.
"System Control Circuit
CVHH-SVX001G-EN
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