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Condenser Water Pump
1. Wire the condenser water pump contactor (5K2) to
a separate 120-volt, single-phase power supply with
14 AWG, 600-volt copper wire.
2. Connect circuit to control panel terminals 1A5-J2-3.
3. Use 1A5-J2-1 120 Vac output to allow the control
panel to control the condenser pump (left panel
only).
Condenser Water Proof of Flow
When this circuit is installed properly and the
condenser pump is running and providing the required
minimum condenser water flow, this circuit will prove
the condenser water flow for the chiller controls. Proof
of condenser water flow is also required for the start
sequence will be allowed to proceed and a loss of
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 1X1-5 to 1K27-4; 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 1A6-J2-2 (left panel only). 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-
CDHF-SVX01N-EN
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 ) )
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). 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.
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.
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
prevent electrical noise interference.
Additional information about the Tracer®
communication interface option is published in the
Installation and Operation manual that ships with the
Tracer® communication interface.
N N o o t t e e : : Comm 4 will require Tracer® controls to be
connected to each panel for individual circuit
information. (Comm 5 will require connections
to the left panel only when available.)
"System Control Circuit
63).
65
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