Trane CITY RTSF Series Manual page 26

Installation - Electrical
LonTalk Communication Interface - Optional
Tracer UC800 provides an optional LonTalk Communication Interface (LCI-C) between the chiller and a BAS. An LCI-C
LLID shall be used to provide "gateway" functionality between the LonTalk protocol and the chiller.
Bacnet Communication Interface - Optional
Tracer UC800 provides an optional Bacnet communication interface between the chiller and a BAS. Bacnet
communication capability is fully integrated on UC800. For further information see Integration Guide.
Modbus Communication Interface - Optional
Tracer UC800 provides an optional Modbus communication Interface between the chiller and a BAS. Modbus
communication capability is fully integrated on UC800. For further information see the Integration guide.
Ice Making Contact - Optional
Tracer UC800 accepts a contact closure input to initiate Ice Building. When in the ice building mode, the compressor
will be fully loaded (not given a low setpoint) and will continue to operate until the ice contacts open or the return
water temperature reaches the Ice Termination Setpoint. If terminated on return setpoint, Tracer UC800 will not allow
the chiller to restart until the ice making contact is opened.
Ice Machine Control - Optional
Tracer UC800 provides an output contact closure that can be used as a signal to the system that ice building is in
operation. This relay will be closed when ice building is in progress and open when ice building has been terminated
by either Tracer UC800 or the remote interlock. It is used to signal the system changes required to convert to and
from ice making.
External Chilled Water Setpoint - Optional
Tracer UC800 will accept either a 2-10 VDC or a 4-20 mA input signal, to adjust the chilled water setpoint from a
remote location.
Auxiliary Chilled/Hot Setpoint Contact - Optional
Tracer UC800 accepts a contact closure input to switch from BAS/External/Front Panel setpoint to a customer defi ned
auxiliary setpoint. By default, chilled water auxiliary setpoint is set to 9°C and hot water auxiliary setpoint is set
to 33°C.
External Current Limit Setpoint - Optional
Tracer UC800 will accept either a 2-10VDC or a 4-20mA input signal to adjust the current limit setpoint from a remote
location.
Percent Condenser Pressure Output - Optional
Tracer UC800 provides a 2-10 VDC analog output to indicate condenser pressure in percent of software High Pressure
Cutout (soft HPC).
Percent HPC =(Lowest Condenser Pressure of all running circuits (abs) / Soft HPC (abs))*100.
Refrigerant Differential Pressure Indication - Optional
Tracer UC800 provides a 2-10 VDC analog output to indicate refrigerant differential pressure with the endpoints
customer defi ned.
Refrigerant Differential Pressure = Lowest of (condenser refrigerant pressure cktx - evaporator refrigerant pressure cktx).
Compressor Percent RLA Output - Optional
Tracer UC800 provides a 0-10 Vdc analog output to indicate %RLA of compressor starter average phase current.
2 to 10 Vdc corresponds to 0 to 120% RLA.
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