14
ARTC-SVX005B-EN
Chiller/Heater Description
Chiller/Heater Scope
This manual provides relevant data to properly
operate, maintain, and troubleshoot the Trane
PolyTherm Simultaneous chiller/heater. Operator and
maintenance personnel must be a qualified
refrigeration technician and have a working knowledge
of high voltage systems, low voltage control circuits,
and components and functions.
Chiller/Heater Capacities
The PolyTherm chiller/heater model is available in 30-,
40-, 50-, and 60-ton capacity modules. Up to 10
modules may connect together in a standard primary/
secondary control arrangement. Simultaneous heating
and cooling modules are equipped with single point
power supply connection to a central distribution block
inside an electrical power distribution panel and
incorporates circuit breaker overload protection for
each PolyTherm module. It is important to connect
modules in the correct sequence as detailed in
Handling of the Modules section of the Installation
Mechanical chapter.
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The water-source modular simultaneous heating and
cooling system consists of individual modules that are
assembled on site. Each PolyTherm module is factory
wired and tested prior to shipment. Each module
includes a compressor, a brazed plate evaporator, a
brazed plate condenser, a source/sink brazed plate heat
exchanger, and controls. The controls operate as a
distributed primary control system that allows each
secondary microprocessor to operate its own
temperature sensors if the primary microprocessor
fails.
Component Description
Every chiller is comprised of four basic components:
compressor, condenser, expansion valve, and
evaporator. Each PolyTherm Chiller/Heater module
contains one or more of these primary refrigeration
components.
Tandem Compressors
The tandem compressor set to have advanced technology for
protection, diagnostics, communication, and verification of their
performance. Technicians can make faster, more accurate, decisions
resulting in improved compressor performance and reliability.
Evaporators, Condensers and Source/
Sink Heat Exchanger
Each single circuit, brazed plate evaporator, condenser
and source/sink heat exchanger is constructed of 316
stainless steel plates and copper brazing and insulated
with closed cell insulation. The fluid piping in each
module uses an electronic two-way valve for selecting
geothermal fluid or load hot or cold fluid depending on
the building heating or cooling demands.
The return fluid piping from each evaporator and
condenser includes an electronic valve for servicing
each module individually while the remaining modules
continue to operate, to allow for variable flow and, on
each condenser and source/sink heat exchanger
operating as a condenser, to control head pressure.
The fluid connections to each heat exchanger use roll
grooved couplings for service convenience and ease of
installation.
