CG-PRC026C-GB
50
Options
Application options
Low ambient option
The low ambient option permits unit controls to allow
start and operation down to ambient temperatures of
-18°C (-0.4°F) for CGAX units; -10°C (26.4°F) for CGAX
heat pump in cooling mode if there is suffi cient glycol in
the evaporator to prevent freezing.
Low noise sound level option
Low noise units are equipped with a jacket encapsulating
each compressor for sound reduction.
SmartFlow Control
Constant speed pump – Variable frequency drive
adjustment
The unit is equipped with a pump package driven
by a speed inverter, without providing continuous
modulation of the speed. The water fl ow is fi xed during
commissioning. The goal of this alternative is to provide
the appropriate fl ow rate and hydraulic balance, without
the need for a mechanical balancing valve, and by taking
advantage of the energy consumption optimization of
the pump.
Water fl ow is adjusted through parameter 204 of the
speed inverter (TR200), when having the dual pump
option, the active pump arbitration is based on pump
equalization time and pump failure status.
Variable speed pump – Constant differential pressure
(DP)
The unit is equipped with a pump package driven by a
speed inverter. The modulation of the pump speed is
made in order to ensure that the Differential Pressure
(DP) remains constant within the system. The minimum
pump speed is factory set at 60% of the nominal speed.
The minimum pump frequency can be adjusted through
inverter. The constant DP option is intended to be used
with 2-way water regulation valves in the customer
hydraulic system. At minimum system partial load, when
most of the 2-way valves are closed, a minimum fl ow
rate must be ensured through the chiller evaporator. DP
is measured by a differential pressure sensor supplied by
Trane, that the customer must install on the water loop,
in a freeze protected area. A regulation valve should be
installed on the by-pass line.
Variable speed pump – Constant differential temperature
(DT)
The unit will be equipped with a pump package driven
by a speed inverter. The modulation of the pump speed
is managed to ensure that chiller DT stays constant.
Entering and leaving temperatures at the evaporator will
be measured directly by the chiller controller, through
the factory-supplied sensor. A DT setpoint will be present
on the unit controller. The option for constant DT is
intended to be used with 3-way valves on water systems,
or 2-way valves on water system but constant fl ow at the
by-pass. The minimum pump frequency can be adjusted
on the inverter.
Partial Heat Recovery
Heat recovery appears more and more as a sensible
response to offset energy costs continually on the rise.
The Trane Conquest chillers with Partial Heat Recovery
option combines the energy savings of heat recovery
operation with the installation and maintenance cost
savings of completely factory packaged air cooled liquid
chillers. The CGAX or CXAX in cooling mode with Heat
Recovery option operate as a standard unit as long as
heat is not required or it can simultaneously produce
chilled and hot water which can be used for applications
like: Heating or preheating of boiler systems or domestic
cater, Air conditioning/ventilation air pre-heat, and
Industrial processes.
The Heat Recovery Exchanger is a brazed plate
exchanger , connected to the compressor discharge line,
and sized to recover up to 20% of the nominal cooling
capacity.
The Heat Recovery Exchanger is not approved for Food
and Beverage applications. The use of a primary loop is
mandatory.
Communication options
BACnet™ communication interface
Allows the user to easily interface with BACnet via a
single twisted pair wiring to a factory installed and
tested communication board.
LonTalk™ communication interface
Allows the user to easily interface with LonTalk via a
single twisted pair wiring to a factory installed and
tested communication board.
ModBus™ communication interface
Allows the user to easily interface with ModBus via
a single twisted pair wiring to a factory installed and
tested communication board.
Other options
Coated condensing coils
For cooling only units (CGAX) a complete coating on
microchannel condenser coils shall be available.
For Heat Pump units (CXAX) pre-coated aluminium
epoxy fi ns shall be available.
Compressors soft starters
Electronic solid state soft starter shall be available.
Deluxe display
For a remote display type Deluxe is available.
