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Start-Up and Shutdown
condenser water temperature sensor is an MMR diagnostic
when in Hot Water Temperature Control mode. (It is an
informational warning in the Normal Cooling mode.)
In the Hot Water Temperature Control mode, the
differential-to-start and differential-to-stop setpoints are
used with respect to the hot water setpoint instead of with
the chilled water setpoint. The control panel provides a
separate entry at the Tracer AdaptiView™ to set the hot
water setpoint; Tracer® AdaptiView™ is also able to set the
hot water setpoint. In the Hot Water mode, the external
chilled water setpoint is the external hot water setpoint; that
is, a single analog input is shared at the 1A16-J2-5 to 6
(ground).
An external binary input to select external Hot Water
Control mode is on the EXOP OPTIONAL module 1A18
terminals J2-3 to J2-4 (ground). Tracer Symbio 800 also
has a binary input to select chilled water control or hot
water temperature control. There is no additional leaving
hot water temperature cutout; the HPC and condenser limit
provide for high temperature and pressure protection.
In Hot Water Temperature Control, the softloading pulldown
rate limit operates as a softloading pullup rate limit. The
setpoint for setting the temperature rate limit is the same
setpoint for normal cooling as it is for hot water temperature
control.
The factory set PID tuning values for the leaving water
temperature control are the same settings for both normal
cooling and hot water temperature control.
Heat Recovery Cycle
Heat recovery is designed to salvage the heat that is
normally rejected to the atmosphere through the cooling
tower and put it to beneficial use. For example, a high-rise
office building may require simultaneous heating and
cooling during the winter months. With the addition of a
heat recovery cycle, heat removed from the building
cooling load can be transferred to areas of the building that
require heat.
Note: The heat recovery cycle is possible only if a cooling
load exists to act as a heat source.
To provide a heat recovery cycle, a heat-recovery
condenser is added to the unit. Though physically identical
to the standard cooling condenser, the heat-recovery
condenser is piped into a heat circuit rather than to the
cooling tower. During the heat recovery cycle, the unit
operates just as it does in the cooling only mode except
that the cooling load heat is rejected to the heating water
circuit rather than to the cooling tower water circuit. When
hot water is required, the heating water circuit pumps
energize. Water circulated through the heat-recovery (or
auxiliary) condenser tube bundle by the pumps absorbs
cooling load from the compressed refrigerant gas
discharged by the compressor. The heated water is then
used to satisfy heating requirements.
An optional heat recovery water flow switch and heat
recovery water flow measurement is available.
84
Auxiliary Condensers
Unlike the heat-recovery condenser (which is designed to
satisfy comfort heating requirements), the auxiliary
condenser serves a preheat function only and is used in
those applications where hot water is needed for use in
kitchens, lavatories, etc. While the operation of the auxiliary
condenser is physically identical to that of the heat-
recovery condenser, it is comparatively smaller in size and
its heating capacity is not controlled. Trane does not
recommend operating the auxiliary condenser alone
because of its small size.
An optional aux condenser water flow switch and heat
recovery water flow measurement is available.
Control Panel Devices and Unit-
Mounted Devices
Unit Control Panel
Safety and operating controls are housed in the unit control
panel, the starter panel, and the purge control panel. The
control panel operator interface is called Tracer
AdaptiView™ and is located on an adjustable arm
connected to the base of the control panel. For more
information about operating Tracer
®
Tracer
AdaptiView™ Display for Water-cooled
CenTraVac™ Chillers with Symbio™ Operations Guide
(CTV-SVU004*-EN). For more information on the
Symbio™ 800 controller, refer to Symbio™ 800 Controller
Installation, Operation, and Maintenance (BAS-SVX080*-
EN).
The control panel houses several other controls modules
called panel-mounted Low Level Intelligent Devices
(LLIDs), power supply, terminal block, fuse, circuit
breakers, and transformer. The inter-processor
communication (IPC) bus allows the communications
between LLIDs and the controller. Unit-mounted devices
are called frame-mounted LLIDs and can be temperature
sensors or pressure transducers. These and other
functional switches provide analog and binary inputs to the
control system.
User-defined Language Support
®
Tracer
AdaptiView™ is capable of displaying English text
or any of 26 other languages (27 total languages).
Switching languages is simply accomplished from a
Language Settings menu. The following languages are
available:
•
Arabic (Gulf Regions)
•
Chinese—China
•
Chinese—Taiwan
•
Czech
•
Dutch
•
English
•
French
®
®
AdaptiView™, refer to
CVHE-SVX005C-EN
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